JP6505640B2 - Propulsion pipe laying device, propulsion pipe laying method, and existing pipe renewal method - Google Patents

Description

  In the present invention, a propelling pipe laying device and a propelling pipe laying method for crushing an existing pipe buried in the ground and excavating the ground around the existing pipe and propelling a propelling pipe, and laying by the propelling pipe laying method The present invention relates to an existing pipe updating method for updating an existing pipe to a main pipe by inserting the main pipe into the sheath pipe and laying the pipe as a sheath pipe.

  Buried pipes (existing pipes) buried in the ground as water lines, life lines for gas, etc. are cracked or damaged due to aging and deterioration, so buried pipes exceeding the useful life are new Replaced with pipe (new pipe) and renewed. In addition, it may be necessary to update the damaged underground pipe to a new pipe in order to restore the earthquake.

  As a method of renewing the existing pipe, there is a case in which a reconstruction promotion method is adopted in which the existing pipe is shredded and the new pipe is promoted without cutting the buried portion of the existing pipe from the ground surface. In this reconstruction promotion construction method, a propelling pipe laying device is used which has a tip conductor having a cutter head at its tip and a propulsion device provided with a propelling means such as a hydraulic jack for applying a propelling force to the tip conductor. About the tip conductor which has a cutter head used for such a rebuilding promotion construction method, and the propelling pipe laying apparatus provided with the tip conductor, JP-A 2010-133145 (patent document 1) and JP-A 2014-109103 It is disclosed by the gazette (patent document 2) etc.

  Generally, in a propelling pipe laying apparatus provided with a tip conductor having a cutter head, an existing pipe is broken little by little by a cutter head of the tip conductor by causing the tipping device to propel the tip conductor to the ground while rotating the cutter head. . Further, by propelling a new propelling pipe by the propelling apparatus behind the front conductor, the propelling pipe is embedded in the space portion formed by crushing and excavation of the cutter head.

  In addition, when crushing an existing pipe with the cutter head of the leading conductor, the crushed material of the existing pipe crushed by the cutter head and the excavated soil (exhaust) produced by excavating the ground around the existing pipe with the cutter head are: It is taken into the inside of the front conductor from the opening provided at the front end of the front conductor, and is further discharged by being sent backward by a helical screw disposed in the front conductor or in the propulsion pipe.

  On the other hand, in the reconstruction promotion method, as means for crushing existing pipes and excavating the ground, it is known to use a down-the-hole hammer method to give impact vibration to the digging bit instead of using the above-described tipper cutterhead. ing. In this down-the-hole hammer method, compressed air is supplied from the compressor to the air hammer device, and the compressed air is used to reciprocate the hammer piston of the air hammer device to strike the drilling bit, and the impact force of the drilling bit Crushing and excavation of the ground are carried out. About the ground shaving apparatus provided with an air hammer device and a digging bit (also referred to as a hammer head) using such a down-the-hole hammer method, it is disclosed, for example, in JP-A-10-259692 (Patent Document 3). There is.

  The shaving apparatus described in Patent Document 3 includes a base provided with two rotating means and movable back and forth on a propulsion stand, and a buried pipe rotatably connected by one rotating means of the base; It has a dirt auger, an air hammer device, and a digging bit (hammer head), which are embedded in a buried pipe and are rotationally driven by the other rotating means of the base.

  In Patent Document 3, it is described that ground force is transmitted by the impact force of the air hammer device to the digging bit, and the ground is shredded by the impact force of the digging bit. In addition, a drainage hole is formed in the excavating bit to which the impact force is transmitted, and the excavated soil excavated by the impact force of the drilling bit is introduced into the buried pipe from the drainage hole of the digging bit, and embedded in the buried pipe It is described that discharging from the buried pipe at the rear end to the outside is carried out by backward transfer with the provided soil auger.

JP, 2010-133145, A JP, 2014-109103, A Unexamined-Japanese-Patent No. 10-259692

  At present, various types of pipes such as ceramic pipes, fume pipes (reinforcing steel pipes), and vinyl chloride pipes are used for buried pipes buried in the ground. In addition, when the buried pipes are joined, a metal collar may be used for the joint.

  For this reason, for example, when the buried pipe is a fumed pipe when the buried pipe is crushed and renewed as a propelling pipe using a cutterhead of the above-described tip conductor in a reconstruction promotion construction method, or the buried pipe, When a metal collar is used for the joint part of the joint, and if the ground around the buried pipe is extremely hard, etc., it takes time for the cutter head to crush and dig, and the propulsion speed may be slow. . In addition, if crushing or drilling is performed only with the cutter head, the cutter head is likely to be worn or damaged, so the number of times the cutter head needs to be replaced increases, and it is necessary to use an expensive carbide cutter head. To increase costs.

  Furthermore, when the fume head is crushed with the cutter head, the cut rebar may be entangled in the cutter head, the screw for transporting the excavated soil, etc. In this case, the construction work is interrupted to remove the entangled matter. There is also a problem that the work efficiency must be reduced.

  On the other hand, in the reconstruction promotion construction method, for example, in the case of crushing the buried pipe with a hammerhead (drilling bit) using the down-the-hole hammer method as in Patent Document 3, compared to the case of using the cutterhead as described above, While being able to break a fume pipe etc. easily and in a short time, problems such as entanglement of reinforcing bars do not occur.

  However, when crushing a buried pipe with a hammerhead or excavating the ground, the hammerhead is usually provided so that a large hammerhead is exposed over the entire front end surface of the leading conductor. In order to apply an impact force), it is necessary to install a large-sized air hammer device inside the leading conductor. Moreover, when installing a large-sized air hammer apparatus, it is necessary to enlarge ground facilities, such as an air compressor which sends air to the air hammer apparatus. For this reason, the construction cost is increased, and the noise due to the air hammer device and the ground facility may be increased, or the installation area of the ground facility may not be secured depending on the location.

  Also, in general, in the down-the-hole hammer method, the crushed material crushed by the hammer head and the excavated soil excavated from the surface of the hammer head to the outer peripheral side edge of the hammer head are provided behind the hammer head Sent. For this reason, it was difficult to secure a large flow path for sending crushed material and excavated soil from the hammer head into the tip conductor, and it was difficult to efficiently introduce crushed material and excavated soil into the tip conductor.

  As a means for discharging crushed material and excavated soil, for example, as in Patent Document 3, a drainage hole for sending crushed material and excavated soil into the tip conductor may be formed in the hammer head itself, in this case, Since it is difficult to form a large drainage hole in order to ensure the strength of the hammerhead appropriately, it becomes difficult to efficiently take crushed material and excavated soil into the leading conductor as in the above case.

  Furthermore, when a large-sized air hammer device is installed in the tip conductor as described above, the air hammer device occupies a large space in the tip conductor, so debris or excavated soil taken into the tip conductor from the hammer head is removed. The size (bore diameter) of the flow path for conveying backward is also limited. Therefore, in the case of using the down-the-hole hammer method in the reconstruction promotion method, there is a problem that the crushed material crushed by the hammer head and the excavated soil can not be discharged efficiently.

  Furthermore, when an existing pipe made of a soft material such as, for example, a vinyl chloride pipe is crushed using a down-the-hole hammer type hammer head, the existing pipe is not broken finely but is largely broken. Can not be discharged. Furthermore, a soft existing pipe may be bent by the hammer head, which may affect the direction control of the leading conductor.

  The present invention has been made in view of the above-described conventional problems, and a specific object thereof is to crush existing pipes or excavate ground around existing pipes regardless of the type of existing pipes or the hardness of the ground. It is possible to stably and efficiently carry out the propelling pipe installation, and a propelling pipe laying device capable of efficiently transporting backward and discharging the crushed crushed material and excavated excavated soil and An object of the present invention is to provide a method for laying a propelling pipe, and further to provide a method for renewing an existing pipe in which an existing pipe is renewed by attaching a new pipe body by using a propelling pipe laid by the propelling pipe laying method.

In order to achieve the above object, the propelling pipe laying device provided by the present invention smashes existing pipes buried in the ground and excavates the ground around the existing pipes to propel and install the propelling pipes In a pipe laying apparatus, a leading conductor disposed in advance of the propelling pipe and performing crushing of the existing pipe and excavating the surrounding ground, and a propelling device for propelling the tip conductor and the propelling pipe from behind In the propelling pipe laying apparatus, the tip conductor has a cylindrical body portion, an excavating surface plate portion disposed at the tip of the body portion, and an air hammer device installed in the body portion. The excavating surface plate portion is provided with a hammer head portion for crushing the existing pipe and excavating the surrounding ground by impact vibration transmitted from the air hammer device, and the existing portion separately from the hammer head portion. Crushed tube and At least one intake opening for taking in and discharging excavated soil into the body portion is arranged, and the excavated surface has irregular irregularities on the surface formed by melting and fixing the cutting tip A front cutter portion is provided, and the front cutter portion having the irregular asperity is formed to be able to crush the existing pipe by a cutting action, and extends from the outer peripheral edge portion of the excavating surface plate portion to the outer peripheral side surface of the body portion The main feature of the present invention is to provide an outer peripheral cutter bit portion continuously formed in a bent shape .
In particular, in a front view of the front conductor, the front end surface of the hammer head portion preferably has an area of 40% or less with respect to the entire front end surface of the front conductor.

In such a propelling pipe laying apparatus according to the present invention, the hammer head portion exceeds the excavated surface central region including the axial center position of the body portion and the outer diameter of the body portion in the front view of the front conductor. Preferably, it is disposed in a continuous substantially rectangular or substantially oval shaped area including a projecting area projecting outward.
Moreover, it is preferable that the two said taking-in opening parts are mutually distribute | arranged in the mutually symmetrical shape in the left-right both sides of the rotation direction of the said tip conductor in the said hammer head part.

Furthermore, in the present invention, the total open area of the intake opening is set to 1% or more and 15% or less of the entire area of the excavated surface plate in a front view of the front conductor. preferable.
Further , it is preferable that the front cutter portion is continuously and radially extended continuously from the central portion of the excavating surface plate portion toward the outer peripheral edge portion of the excavating surface plate portion.

  Next, according to the propelling pipe laying method provided by the present invention, the existing pipe buried in the ground is crushed between the start shaft and the reach shaft excavated on the ground surface and the periphery of the existing pipe is A propelling pipe laying method for excavating ground and propelling a propelling pipe, wherein the propelling pipe laying device of the present invention having the above-described configuration is carried into and installed in the start shaft, and filling in the existing pipe Filling the filling material by the hammerhead portion of the leading conductor by advancing the material while the leading conductor of the propelling pipe laying apparatus is rotated from the starting shaft toward the reaching shaft Crushing the existing pipe and excavating the ground around the existing pipe, and the crushed material of the existing pipe and excavated soil through the take-in opening of the front conductor, Captured in the torso In is to the most important feature that it comprises a to discharge.

  Further, in the propelling pipe laying method according to the present invention, the water is sent from the ground surface to the inside of the leading conductor through a water supply hose, and the water is taken off from the leading conductor through the propelling pipe laid behind the leading conductor. It is preferable to include discharging the crushed material and the excavated soil taken in from the intake opening into the trunk by flowing toward the shaft.

  Next, the existing pipe updating method provided by the present invention uses the above-described propelling pipe laid by the above-described propelling pipe laying method of the present invention as a sheath pipe, and inserts the main pipe into the sheath pipe and lays it The present invention is mainly characterized in that the existing pipe is replaced with the main pipe.

  Further, according to the existing pipe updating method of the present invention, a plurality of spacer bands capable of supporting the main pipe at a predetermined position with respect to the sheath pipe before inserting the main pipe, the outer periphery of the main pipe Attached to the surface at predetermined intervals in the longitudinal direction of the main pipe, insert the main pipe to which the spacer band is attached into the sheath pipe, and support the main pipe with a plurality of the spacer bands (B) laying the main pipe in the sheath pipe with a predetermined gradient, and filling the space between the sheath pipe and the main pipe with a core material to fix the position of the main pipe with respect to the sheath pipe It is preferable to include.

  The propelling pipe laying device according to the present invention comprises a tip conductor disposed in advance of the propelling pipe, and a propelling device for propelling the tip conductor. The front conductor has a cylindrical body portion, an excavating surface plate portion disposed at the tip of the body portion, and an air hammer device installed inside the body portion. Moreover, the hammerhead part which performs crushing of an existing pipe and excavation of a ground simultaneously is distribute | arranged to a part of excavated surface board part of a front conductor. Furthermore, at a portion of the excavated surface portion different from the hammerhead portion, at least one intake opening is disposed for taking up the fragments of the existing pipe and the excavated soil into the body portion of the leading conductor.

  According to such a propelling pipe laying apparatus of the present invention, since crushing and the like of the existing pipe are performed using the down-the-hole hammer type hammer head part, regardless of the type of the existing pipe and the hardness of the ground, crushing and excavation can be performed. This can be easily performed, and can reduce the time required for crushing and the like as compared with, for example, the case of using a cutter head. Furthermore, even when the fume tube is broken, problems such as entanglement of reinforcing bars do not occur.

  Further, in the excavated face plate portion of the tip conductor of the present invention, a take-in opening is provided separately from the hammer head portion. By providing the take-in opening in a portion different from the hammer head in this way, a large take-in opening can be easily provided in the excavated face plate of the leading conductor without worrying about the strength of the hammer head. Therefore, the crushed material crushed in the hammer head and the excavated excavated soil can be efficiently taken in and stably discharged in the body of the leading conductor through the intake opening.

  In such a propelling pipe laying device of the present invention, the hammer head portion is stretched outward beyond the excavated surface central region including the axial center position of the body portion and the outer diameter of the body portion in a front view of the leading conductor. It is arranged in a continuous substantially rectangular or substantially oval shaped area including a projecting area. The hammerhead portion is provided only on a part of the excavated surface plate portion by propelling the tip conductor provided with the hammerhead portion in the region of such excavated surface portion while rotating the tip conductor by the propulsion device. Even if it is not used, crushing of the existing pipe and excavation of the ground can be performed smoothly and stably so as to form a cylindrical space.

  Further, in the present invention, two take-in openings are arranged in symmetrical shapes with respect to each other on the left and right sides in the direction of rotation of the leading conductor in the hammer head. Thus, when the propelling device is caused to rotate while the leading conductor is rotated, the cutting surface provided in the excavating surface plate portion is rotated regardless of whether the leading conductor is rotated clockwise or counterclockwise in a front view. Crushed material and excavated soil can be stably taken into the body of the leading conductor through the insertion opening.

  Furthermore, in the present invention, the total open area of all the intake openings provided in the excavated surface plate portion is 1% or more and 15% or less of the entire area of the excavated surface plate portion in a front view of the leading conductor. Preferably, it is set to 3% or more and 13% or less, more preferably, 6% or more and 10% or less. By setting the total opening area of the intake opening portion to 1% or more of the entire area of the excavating surface plate portion, it is possible to smoothly take in debris or excavated soil from the intake opening portion. Further, by setting the total opening area of the intake opening portion to 15% or less of the entire area of the excavating surface plate portion, the strength of the excavating surface plate portion can be stably secured.

  In addition, the excavated face plate portion of the tip conductor in the present invention is formed by melting and fixing the cutting tip, and the face cutter portion having irregular asperity on the surface is provided. In this case, in particular, the front cutter portion is continuously and radially extended from the central portion of the excavating surface to the outer peripheral edge of the excavating surface. As described above, since the front cutters are radially connected to the excavated surface plate separately from the hammer head, fracture of the existing pipe and excavation of the ground can be performed more efficiently.

  Further, the tip conductor in the present invention is provided with an outer peripheral cutter bit portion continuously formed in a bent shape from the outer peripheral edge portion of the excavating surface plate portion to the outer peripheral side surface of the body portion. Thereby, while excavating the ground around the existing installation more effectively, the tip conductor can be promoted more smoothly by the propulsion device.

  Next, in the propelling pipe laying method according to the present invention, first, the propelling pipe laying device of the present invention having the above-described configuration is carried into and installed in a start shaft excavated on the ground surface, Fill the filler and harden it. In this case, either of the installation of the propulsion pipe laying device and the filling of the filler may be performed first, and the order is not limited.

  After the filling material hardens, the propelling device of the propelling pipe laying device advances the leading conductor from the starting shaft to the reaching shaft along the existing pipe while rotating. As a result, regardless of the type of existing pipe or the hardness of the ground, the hammerhead portion of the leading conductor can fracture the existing pipe filled with the filling material and excavate the ground around the existing pipe, and further, the fracture and the crushing A propulsion pipe can be propelled and laid in a cylindrical space formed by excavation. Particularly in this case, even if the existing pipe is made of a soft material such as a vinyl chloride pipe, for example, the existing pipe is filled with the filler and solidified, so that the existing pipe can be finely and stably crushed and The existing pipe can be prevented from being bent by the hammer head, and the leading conductor can be stably advanced along the existing pipe. Furthermore, according to the present invention, crushed material of existing pipe and excavated soil can be efficiently taken in and stably discharged in the body of the leading conductor through the intake opening provided in the excavated surface plate.

  In such a propelling pipe laying method of the present invention, when propelling while rotating the leading conductor to crush the existing pipe and excavating the ground, water is sent from the ground surface to the inside of the leading conductor through the water supply hose. Is made to flow from the front conductor toward the rear starting shaft. As a result, the crushed material and excavated soil taken into the body of the leading conductor through the intake opening provided in the excavated surface plate are transported from the leading conductor toward the rear start shaft and easily discharged. be able to.

  Next, in the existing pipe updating method provided by the present invention, the main pipe is inserted and laid in the sheath pipe, using the propulsion pipe laid by the above-described propulsion pipe laying method of the present invention as a sheath pipe. Thereby, the main pipe can be stably laid, and the existing pipe can be smoothly renewed.

  Also, in this case, before inserting the main pipe, a plurality of spacer bands, which are adjusted so that the main pipe can be supported at a predetermined position with respect to the sheath pipe, are provided on the outer peripheral surface of the main pipe at predetermined intervals. Attach and insert the main tube with the spacer band attached into the sheath tube. Thus, the main pipe inserted into the sheath pipe is supported at a predetermined position with respect to the sheath pipe by the plurality of spacer bands, so that the main pipe can be stably laid in the sheath pipe with a predetermined gradient. it can. After that, the space between the sheath and the main pipe is filled with the core material to fix the position of the main pipe with respect to the sheath. By performing the above-described steps, the main pipe can be stably buried in the ground so as to have a predetermined gradient in a predetermined direction, instead of the existing pipe buried in the ground.

It is a schematic diagram which shows typically the apparatus and installation which are used by embodiment. It is a fragmentary sectional view showing the inside of a tip conductor typically. It is a front view which shows a tip conductor typically. It is a side view showing a propulsion device typically. It is a flowchart which shows the process at the time of updating an existing pipe. It is a schematic diagram which illustrates typically the installation process of a propulsion apparatus. It is a schematic diagram which illustrates the filling process of a filler typically. It is a schematic diagram which illustrates the installation process of a front conductor typically. It is a schematic diagram which demonstrates a crushing excavation promotion process typically. It is a schematic diagram which illustrates typically the removal process of a front conductor. It is a schematic diagram which demonstrates a cleaning process of a crushed material and excavated soil typically. It is a schematic diagram which demonstrates a main pipe insertion process typically. It is a schematic diagram which demonstrates the filling process of a core-filling material typically. It is a longitudinal cross-sectional view which shows a main pipe. It is a cross-sectional view which shows a propulsion pipe, a main pipe, and a spacer band. It is a front view which shows the 1st modification of a tip conductor. It is a front view which shows the 2nd modification of a tip conductor. It is a front view which shows the 3rd modification of a tip conductor. It is a front view which shows the 4th modification of a tip conductor.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. The present invention is not limited to the embodiments described below, and various modifications may be made as long as they have substantially the same configuration as the present invention and only exhibit the same function and effect. It is possible.

  For example, in the following embodiment, a steel pipe is used as a propelling pipe and a hard vinyl chloride pipe is used as a main pipe. However, in the present invention, the material of the propelling pipe and the main pipe is particularly It is not limited.

  In the present embodiment, a hard vinyl chloride pipe is embedded as an existing sewer pipe, and the sewer pipe (existing pipe) is crushed to newly embed the hard vinyl chloride pipe as a main pipe. The case of updating the sewer pipe by will be described.

  When the sewer pipe is to be renewed, the start shaft 1 and the reach shaft 2 as shown in FIG. 6 and the like are excavated from the ground surface, with the section (update section) to be subjected to the renewal work being interposed therebetween. In this case, a part of the sewer pipe (existing pipe 3) appearing in the start shaft 1 and the reach shaft 2 to be excavated is destroyed and removed, and further, the upstream side and the downstream side of the updating section are Connect and use a pump or the like to divert the waste water flowing from the upstream side of the renewal section to the ground surface via the bypass hose and send it downstream. When there is a shaft that has already been excavated, it is possible to use the shaft as the starting shaft 1 or the reaching shaft 2.

  In order to carry out the renewal work of the sewer pipe, various facilities are installed around the start shaft 1 and the reach shaft 2. For example, as shown in FIG. 1, a truck 11 with a crane used when carrying in a device or the like into the start shaft 1 or a dump truck 12 for transporting soil and the like discharged by digging and the like are prepared. Also, a hydraulic unit 13 that generates hydraulic pressure and supplies it to the propulsion device 50, a generator 14 that supplies electric power to the propulsion device 50, a lubricant material plant 15 that supplies lubricant, and a line that supplies oil to an air hammer device 34 described later. Oilwater 16, compressor 17 for supplying high-pressure air to air hammer device 34, water pump 19 for supplying water to leading conductor 30 via water hose 18 for discharging crushed material etc. start shaft 1 Installed around the

  In this case, in the present embodiment, as described later, since the small-sized air hammer device 34 is installed in the tip conductor 30, the line oiler 16 and the compressor 17 for supplying oil and compressed air to the air hammer device 34 are miniaturized. As a result, the installation area of the equipment can be made compact, and the generated noise can be suppressed more than ever.

  Moreover, in this embodiment, the mixer 21 (refer FIG. 7 etc.) which mixes fillers, such as mortar, and the grout pump 22 (refer FIG. 7 etc) which injects the mixed filler other than the installation mentioned above Etc. are installed around the launch shaft 1. Furthermore, in the start shaft 1 of the present embodiment, a laser transit 23 for irradiating the target 32 of the leading conductor 30 described later with a laser to measure the position of the leading conductor 30 or a fragmented material flowing with water from the leading conductor 30 And a pot site (not shown) for temporarily storing excavated soil.

In the present embodiment, the propelling pipe laying device used in the crushing and drilling promotion process includes a tip conductor 30 that performs crushing and digging, and a propulsion device 50 that propels the tip conductor 30.
The end conductor 30 of the present embodiment has a cylindrical body portion 31 and an excavating surface plate portion 41 disposed at the tip of the body portion 31, as shown in FIG. 2 and FIG. Further, in the body portion 31 of the leading conductor 30, a hammer head portion 33 whose tip end surface is exposed to the excavating surface plate portion 41, an air hammer device 34 for giving striking vibration (impact force) to the hammer head portion 33, and a body Two support fixing portions 35 for supporting and fixing the air hammer device 34 to the portion 31, a stopper portion 36 for preventing the air hammer device 34 from lowering backward, compressed air (high pressure air) from the compressor 17 as the air hammer device 34, a guide hose 38 connected to the water supply hose 18 for guiding water for discharge into the body 31, a hose fixing portion 39 for fixing the guide hose 38, a position of the leading conductor 30, A target 32 to which a laser is irradiated to measure the direction is disposed.

  The front end portion of the hammer head portion 33 is exposed and disposed in the excavating surface plate portion 41 of the front conductor 30. In addition, in the excavating surface plate portion 41, two intake openings 42 disposed on both sides of the hammer head portion 33, and a plurality of radially disposed portions from the central portion of the excavating surface plate portion 41 toward the outer peripheral edge portion The front cutter portion 43 is formed. Furthermore, an outer peripheral cutter bit portion 44 continuously formed in a bent shape is provided at the outer peripheral edge portion of the excavating surface plate portion 41 to the outer peripheral side surface of the body portion 31.

  In the tip conductor 30 of this embodiment, the tip end portion of the hammer head portion 33 has a flat tip end surface exposed forward, and a plurality of hemispherical hammer bids 33 a protruding from the tip end surface. . In this case, the hammer bid 33 a has a large size first hammer bid and a small size second hammer bid, and the first hammer bid is disposed along the outer periphery of the tip end face of the hammer head portion 33. And a second hammer bid is disposed in an area inside the first hammer bid. In addition, in this invention, arrangement | positioning, a magnitude | size, etc. of a hammer bid are not specifically limited, It can change arbitrarily.

  The front end surface of the hammer head portion 33 of the present embodiment is disposed on a part of the excavating surface plate portion 41 of the front conductor 30 in a front view (FIG. 3) of the front conductor 30. It has a substantially oval shape (or a substantially rectangular shape) having straight left and right sides disposed in parallel to each other.

  In this case, the tip surface of the substantially oval shape of the hammer head portion 33 is an excavated surface including the axial center position (axial center position of the body portion 31) in the rotation of the front conductor 30 with respect to the entire tip surface of the front conductor 30. It is formed so as to include a central area (rotational central area) and a projecting area which protrudes outward beyond the outer diameter of the body portion 31. As a result, when the leading conductor 30 is rotated to advance forward and perform a crushing excavation operation, the hammer head 33 (the tip surface of the substantially oval shape) is more than a region where the body 31 of the leading conductor 30 is inserted. It is possible to fracture and excavate a wide circular area.

  In this case, in a front view of the leading conductor 30, the tip end face of the hammer head portion 33 is a leading end in order to efficiently carry out the crushing and digging work and to efficiently discharge the generated fragments and excavated soil. The area of the entire tip surface of the body 30 is preferably 15% or more and 40% or less, in particular, 20% or more and 30% or less.

  The air hammer device 34 for giving impact vibration to the hammer head portion 33 is not shown in the figure provided in the air hammer device 34 by the supply of compressed air from the compressor 17 as well as a general air hammer device used conventionally. The hammer piston of the cylinder is reciprocated, and the reciprocation of the hammer piston strikes the hammer head portion 33 to apply an impact force, but is formed in a relatively small size.

  By thus installing the small air hammer device 34, it is possible to allow a space in the body portion 31 of the leading conductor 30 to be increased, whereby the intake opening portion 42 of the excavating surface plate portion 41 can be provided. The crushed material and excavated soil taken into the body portion 31 of the leading conductor 30 can be smoothly and efficiently transported and discharged rearward using the water flowing out of the guide hose 38. .

  The left and right intake openings 42 are formed to penetrate the excavating surface plate portion 41 from the front to the rear. The two intake openings 42 have a symmetrical shape, with the hammer head portion 33 interposed therebetween in the front view of the leading conductor 30, and the excavating surface plate portion 41 has a clockwise direction in FIG. Even if it rotates counterclockwise or rotates counterclockwise, the crushed material and excavated soil crushed and excavated by the hammer head 33 etc. are inserted into the body 31 of the lead conductor 30 through the intake opening 42. It can be captured efficiently.

  The left and right intake openings 42 extend from one end of the head side linear portion disposed parallel to the left and right side portions of the hammer head portion 33 and one end of the head side linear portion, and extend along the cylindrical outer periphery of the body portion 31. It is formed in a petal-like shape having an arc portion arranged as described above.

  In this case, the total opening area of the two intake openings 42 in the front view of the leading conductor 30 is the excavated surface in consideration of the efficient intake of crushed material and excavated soil and the strength of the excavated surface 41 It is set to be a ratio of 1% to 15%, preferably a ratio of 3% to 13%, and more preferably a ratio of 6% to 10% of the entire area of the part 41. For example, in the case of the present embodiment, the total opening area of the two intake openings 42 is set to be about 9% of the entire area of the excavating surface plate 41.

  Further, as a means for crushing the existing pipe 3 and excavating the ground in the tip conductor 30 of the present embodiment, in addition to the hammer head portion 33, as described above, a plurality of front cutter portions 43 and a plurality of outer periphery cutters A bit portion 44 is provided. Each front cutter portion 43 is formed independently in a linear form extending radially continuously from the central portion of the excavating surface plate portion 41.

  In this case, each front cutter portion 43 is formed by melting and fixing a plurality of cutting tips, and the surface is continuously provided with irregular asperities. The front cutters 43 are filled in the existing pipe 3 and the existing pipes 3 with which the front cutter portion 43 comes in contact by a cutting action by rotating clockwise or counterclockwise in a front view as the front conductor 30 advances. It is possible to finely destroy the filler, which will be described later, and the ground around the existing pipe 3.

  The outer peripheral cutter bit portion 44 provided on the leading conductor 30 is formed by continuously attaching the cutter bit from the outer peripheral edge portion of the excavating surface plate portion 41 to the outer peripheral side surface of the body portion 31 in a bending manner. The outer periphery cutter bit portion 44 can also excavate the ground, which the outer periphery cutter bit portion 44 contacts, by cutting action by rotating clockwise or counterclockwise in a front view while the leading conductor 30 advances.

  The propulsion device 50 for propelling force to the front conductor 30 as described above is installed in the start shaft 1 and is supported by pressing the front conductor 30 or the propulsion pipe 4 while supporting the front conductor 30 or the propulsion pipe 4 It is a device for propelling the front conductor 30 and the like along the axial direction, and has a structure similar to that of a propelling device generally used conventionally.

  Briefly, as shown in FIG. 4, the propulsion device 50 according to the present embodiment is slidably disposed on the slide base 51 fixed to the bottom surface of the start shaft 1 and on the slide base 51 in the front-rear direction. Together with the main body 52 for supporting and fixing the front conductor 30 or the propelling pipe 4, the hydraulic cylinder 53 capable of advancing and retracting the main body 52 to give propulsive force to the front conductor 30 and the propelling pipe 4, rotation of the front conductor 30 and the propelling pipe 4 And a hydraulic motor 54 for applying a force.

  Further, the propulsion device 50 is provided with an operation lever 55, an operation switch (not shown) and the like for performing various operations. The device body 52 has a rotating portion 52a rotatably supported by a bearing (not shown), and the rotation of the hydraulic motor 54 is transmitted to the rotating portion 52a. The hydraulic pressure of the hydraulic unit 13 installed on the ground is supplied to the hydraulic cylinder 53 and the hydraulic motor 54.

  Next, using the propulsion pipe laying device provided with the above-described tip conductor 30 and the propulsion device 50, the existing pipe 3 (sewer pipe) embedded between the start shaft 1 and the arrival shaft 2 is crushed and the propulsion pipe A method of updating the existing pipe 3 to the main pipe 5 by inserting and fixing a new main pipe 5 into the propulsion pipe 4 will be described with reference to the drawings.

Here, FIG. 5 is a process flow diagram in the renewal work of the existing pipe 3.
When performing the renewal work of the existing pipe 3, first, as shown in FIG. 6, the propulsion device 50 of the propelling pipe laying device is carried into the start shaft 1 excavated in advance using a crane or the like, and the predetermined position is obtained. Install and fix on.

  Next, a filling step is performed in which the mortar 62 as a filler is filled into the existing pipe 3 of the entire update section. In this filling step, first, a first closing member (not shown) is attached to the end of the pipeline on the side of the starting shaft 1 of the existing pipe 3 to block the end of the pipeline and the pipe on the side of the reaching shaft 2 of the existing pipe 3 The road end is also closed by attaching the second closing member. In this case, an air vent pipe 61 for removing the air in the existing pipe 3 is attached to the first closing member and the second closing member. Further, the first closing member is provided with an inlet for the mortar 62, and the inlet hose 22a of the grout pump 22 is connected.

  After the first and second closing members are attached to both ends of the existing pipe 3 respectively, the raw material such as cement and water are mixed and kneaded by the mixer 21 installed on the ground, and the mortar 62 is produced, and the production thereof The mortar 62 is pumped by a grout pump 22 so that the mortar 62 is injected and filled into the existing pipe 3 from the injection hose 22a.

  At this time, for example, by observing the air vent pipe 61 attached to the second closing member, it is possible to confirm that the mortar 62 is filled in the existing pipe 3 by blowing out the mortar 62 from the air vent pipe 61 . In the present invention, the filling material filled in the existing pipe 3 is not limited to the mortar 62, and other materials can be used. In addition, the injection conditions and the like of the mortar 62 are appropriately set.

  By filling the mortar 62 in the existing pipe 3 in this way, the existing pipe 3 made of vinyl chloride is reinforced, and when the existing pipe 3 is crushed by the hammer head 33 and the front cutter 43 as described later. Thus, the existing pipe 3 can be prevented from being greatly bent in the ground, and the existing pipe 3 can be finely and stably crushed. After filling of the mortar 62 is confirmed, the grout pump 22 is stopped to complete the pouring operation. In the present invention, either of the loading and setting process of the propulsion device 50 and the filling process of the mortar 62 may be performed first.

  After the mortar 62 (filling material) filled in the existing pipe 3 dries and hardens, the first and second closing members are removed. Subsequently, as shown in FIG. 8, the leading conductor 30 of the propelling pipe laying device is carried into the starting shaft 1 using a crane or the like, and the leading conductor 30 is installed in the propulsion device 50 installed in the starting shaft 1. Perform the process. Further, a well port 63 having a toroidal rubber ring is attached to the periphery of the existing pipe 3 in the start shaft 1. By attaching the wellhead 63, the inflow of soil, lubricant and compressed air into the start shaft 1 is prevented.

  After attaching the wellhead 63, the tip conductor 30 is driven to carry out a crushing and drilling promotion step of crushing the existing pipe 3 and digging the ground. In this crushing and drilling promotion process, the propulsion device 50 is operated to rotate the tip conductor 30 installed in the propulsion device 50 in the circumferential direction of the body 31 and to advance it at a predetermined speed. Further, the air hammer device 34 installed in the leading conductor 30 is operated to give a striking vibration to the hammer head portion 33 provided on the excavating surface plate portion 41 of the leading conductor 30 by the down-the-hole hammer method. Furthermore, water is supplied from the water pump 19 installed on the surface to the lead conductor 30 via the water hose 18 and the guide hose 38.

  As a result, the existing pipe 3 and the mortar 62 filled in the existing pipe 3 are crushed by the hammer head 33 and the front cutter part 43 and the outer peripheral cutter bit part 44 provided on the leading conductor 30, and at the same time the existing pipe 3. Dig the surrounding ground. At this time, since the mortar 62 is filled in the existing pipe 3, the existing pipe 3 can be finely and uniformly and stably crushed as described above. Moreover, since not only the small hammer head part 33 but the front cutter part 43 and the outer periphery cutter bit part 44 are used, crushing and excavation can be performed efficiently.

  In particular, since the hammer head portion 33 of the present embodiment is disposed in the substantially oval shaped area including the excavated surface central region and the projecting region in the excavated surface plate portion 41 of the front conductor 30 as described above, By rotating 30, it is possible to fracture and excavate while applying the impact force of the hammer head portion 33 to the entire surface of the circular face (excavated surface).

  In addition, the hammer head portion 33 has a projecting area that exceeds the outer diameter of the body portion 31 of the front conductor 30 in a front view of the front conductor 30, so that the area of the circular face surface to be excavated by the front conductor 30 The area of the circular cross section in the body portion 31 of 30 and the area of the circular cross section in the propulsion pipe 4 following the leading conductor 30 can be secured larger. Therefore, the frictional resistance generated between the propelling device 50 and the ground when propelling the tip conductor 30 and the propelling pipe 4 is reduced, and the propelling force of the propelling device 50 necessary for propelling the tip conductor 30 and the propelling pipe 4 can be reduced. It can be reduced.

  Furthermore, in the excavating surface plate portion 41 of the front conductor 30 of the present embodiment, the take-in openings 42 are provided on the left and right sides of the hammer head 33, so the hammer head 33, the front cutter 43, and the outer periphery cutter The crushed material crushed in the bit portion 44 and the excavated excavated soil can be efficiently taken into the trunk portion 31 of the leading conductor 30 from the two intake openings 42, whereby The efficiency of crushing and excavation by the excavating surface portion 41 can be enhanced.

  Further, the crushed material and excavated soil taken into the body portion 31 of the front conductor 30 from the two intake openings 42 are supplied from the water pump 19 to the front conductor 30 via the water supply hose 18 and the guide hose 38. The water is flowed toward the starting shaft 1 and discharged to a bay installed in the starting shaft 1. Furthermore, the crushed material and excavated soil discharged to the pot are separated in the pot and then transported to the surface and appropriately processed.

  After the leading conductor 30 is propelled by a predetermined distance by the propulsion device 50, the steel propulsion pipe 4 following the leading conductor 30 is installed in the propulsion device 50 and connected to the rear end of the leading conductor 30, and the propulsion pipe 4 is advanced by the propulsion device 50 while being rotated as in the case of the leading conductor 30. As a result, as shown in FIG. 9, the propelling pipe 4 can be propelled so as to be buried in the ground while the crushing and excavation by the excavating surface plate portion 41 of the leading conductor 30 are in progress. Thereafter, the propulsion pipe 4 is sequentially propelled from the start shaft 1 to the arrival shaft 2 by repeatedly performing the installation process of the propulsion pipe 4 and the crushing and excavation processes by rotating and advancing the tip conductor 30 and the propulsion pipe 4. Can be buried.

  In the present embodiment, as described above, the crushing and digging by the excavating surface plate portion 41 of the leading conductor 30 and the burying of the propulsion pipe 4 are advanced, and the pouring operation of the lubricant and the measuring operation of the position of the leading conductor 30 are performed. Is done repeatedly. In the lubricant injection operation, a lubricant injection hose is connected to an injection hole (not shown) bored in the front conductor 30 or the propulsion pipe 4 and the lubricant is injected from the injection hole into the ground around the lead conductor 30 and the propulsion pipe 4 It is done by doing.

  By performing the work of injecting the lubricant, it is possible to reduce the frictional resistance between the outer peripheral surface of the propelling pipe 4 and the ground around the propelling pipe 4 and to propel the propelling pipe 4 more efficiently. Moreover, while being able to make the outer peripheral surface of the propulsion pipe 4 hard to be damaged by the surrounding ground, looseness of the ground around the propulsion pipe 4 can be prevented.

In addition, the laser transit 23 installed in the starting shaft 1 irradiates the laser to the target 32 provided on the leading conductor 30 and repeatedly measures the position of the leading conductor 30, thereby grasping the direction and the forward direction of the leading conductor 30 Thus, the direction control of the leading conductor 30 can be stably performed. As a result, since it becomes possible to perform straightening and straightening with a predetermined direction and a predetermined gradient, it is possible to connect a plurality of propulsion pipes 4 straight and lay them in the ground. It can .

  Then, when the leading conductor 30 reaches the reaching shaft 2 and comes out, all the existing pipes 3 in the updating section are crushed and removed, and the propulsion pipe 4 is laid straight all over the updating section. After the leading conductor 30 reaches the reaching shaft 2 and stops the propulsion device 50, the leading conductor 30 is recovered from the reaching shaft 2 and removed. At this time, depending on the size of the reaching shaft 2, the leading conductor 30 may be lifted and recovered as it is by a crane or the like, or the leading conductor 30 may be disassembled and recovered.

  Moreover, while performing the removal process of the front conductor 30, the water supply hose 18 used for sending water to the front conductor 30, and the lubricant injection hose used for supplying lubricant are recovered from the start shaft 1 side Remove.

  Furthermore, as shown in FIG. 11, in order to remove crushed material and excavated soil remaining in the laid propelling pipe 4 which can not be discharged by water, as shown in FIG. And move toward the start shaft 1. By this, the crushed material and the excavated soil remaining in the propulsion pipe 4 can be removed cleanly and discharged. Thereafter, the earth removing machine 64 that has reached the starting shaft 1 is recovered, and the crushed material and the excavated soil are separated and appropriately treated. At the same time, the propulsion device 50 installed in the start shaft 1 is lifted and removed by a crane or the like.

  After removing the propulsion device 50 and confirming the installation state of the propulsion pipe 4, etc., the installed propulsion pipe 4 is used as a sheath pipe for the main pipe 5, and a plurality of main pipes 5 are inserted in the sheath pipe for laying Shift to the process of

  In the present embodiment, for the main pipe 5, a hard vinyl chloride pipe having a diameter smaller than that of the propulsion pipe (sheath pipe) 4 and having a shape as shown in FIG. 14 is employed. The main pipe 5 extends from the main pipe body portion 5a having a constant inner diameter, the widening portion 5b for gradually increasing the inner diameter along the longitudinal direction, and the widening portion 5b, and has the same size as the outer diameter of the main pipe body portion 5a. And a connecting portion 5c having an inner diameter. A plurality of main pipes 5 can be connected continuously by inserting the main pipe body portion 5 a of the subsequent main pipe 5 into the connection portion 5 c of the main pipe 5.

  It is possible to hold the main pipe 5 at a predetermined position in the propulsion pipe 4 in the main pipe body 5a of the main pipe 5 before inserting such a main pipe 5 into the propulsion pipe (sheath pipe) 4. A steel spacer band (support fixing band) 6 is attached. The spacer band 6 is, as shown in FIG. 15, an annular band plate portion 6a which holds the main tube 5 in contact with the outer peripheral surface of the main tube 5, and tongues outwardly from the cut portion of the band plate portion 6a. It is extended outward along the radial direction from the band plate portion 6a, and is provided inside the sheath tube. And 4 legs 6d in contact with the circumferential surface.

  A plurality of spacer bands 6 having such a configuration are attached at predetermined intervals (for example, 2 m intervals) in the longitudinal direction of the main pipe 5 to the outer peripheral surface of the main pipe 5 connected linearly, and the legs of each spacer band 6 By processing and adjusting the length of the portion 6d in accordance with the installation location of the spacer band 6, a plurality of main pipes 5 connected linearly can be supported and laid with a predetermined gradient with respect to the sheath pipe 4. be able to.

  When laying by inserting a plurality of main pipes 5 into the sheath pipe 4, first, one or more spacer bands 6 are attached to the main pipe main portion 5a of the main pipe 5 to be inserted into the sheath pipe 4 Do. Subsequently, as shown in FIG. 12, the main pipe 5 to which the spacer band 6 is attached is carried into the start shaft 1 and inserted from the end of the propulsion pipe 4 (sheath pipe) on the side of the start shaft 1. By connecting a plurality of main pipes 5 while performing such an insertion process of the main pipe 5 to which the spacer band 6 is attached, the main pipe 5 can be communicated from the start shaft 1 to the arrival shaft 2 Lay down.

  After the main pipe 5 is inserted into the propelling pipe 4 and laid, as shown in FIG. 13, in a space extending between the main pipe 5 and the propelling pipe 4 in a toroidal cross-sectional shape along the longitudinal direction Then, a filling step of filling the mortar 65 as a filling material is performed.

  In the filling process of the filling material, as in the case of the filling process of the filling material described above, first, a first closing member (not shown) is attached to the end of the pipeline on the start shaft 1 side to close it. The end of the duct is also closed by attaching the second closing member. Further, an air vent pipe (not shown) for venting air is attached to the first closing member and the second closing member, and an inlet (not shown) for mortar 65 is provided in the first closing member. The injection hose 22a is connected.

  After the first and second closing members are attached, a mortar 65 is prepared by mixing and kneading a material such as cement and the like and water with a mixer 21 installed on the ground, and the prepared mortar 65 is pumped by a grout pump 22 Thus, the mortar 65 is injected and filled from the injection hose 22a into the space between the main pipe 5 and the propulsion pipe 4. In the present invention, the core material is not limited to the mortar 65, and other materials can be used. In addition, the injection conditions and the like of the mortar 65 are appropriately set.

  By filling the space between the main pipe 5 and the propelling pipe 4 with the mortar 65 in this manner, the main pipe 5 supported with a predetermined gradient can be fixed in the propelling pipe 4, whereby the main pipe The slope of 5 can be stably maintained. Moreover, since the propulsion pipe 4 is reinforced, it can prevent that the propulsion pipe 4 receives a stress from surrounding ground and bends.

  After completion of the filling of the filling material (mortar 65), the installed equipment and the like are unloaded and cleaned, whereby the laying process of the main pipe 5 is completed. By inserting and laying the main pipe 5 into the propulsion pipe 4 as described above, the laying operation of the main pipe 5 can be performed easily and stably, and the main pipe 5 is moved in a predetermined direction. It can be laid stably with a predetermined gradient.

  By performing the above steps according to the flow shown in FIG. 5, the existing pipe 3 buried in the ground can be replaced with the main pipe 5, and the sewer pipe can be smoothly renewed to the new main pipe 5. . Particularly in the present embodiment, even if the existing pipe 3 is made of vinyl chloride, the tip conductor 30 having the hammer head portion 33 etc. shown in FIGS. 2 and 3 is used, and the existing pipe 3 is filled with a filler. In order to perform crushing and excavation by the tip conductor 30 later, the existing pipe 3 can be finely and stably crushed.

  In addition, the crushed material crushed by the leading conductor 30 and the excavated excavated soil can be efficiently inserted into the trunk portion 31 of the leading conductor 30 through the two intake openings 42 provided in the excavating surface plate portion 41 of the leading conductor 30. Can be taken out and discharged stably. For this reason, it becomes possible to advance the tip conductor 30 along the existing pipe 3 at a speed faster than before, and it is possible to shorten the construction period and to reduce the cost associated therewith.

  In the embodiment described above, the case of performing the renewal work of the existing pipe 3 using the front conductor 30 shown in FIG. 2 and FIG. 3 is described, but in the present invention, the excavated surface board shown in FIG. It is also possible to perform the renewal work of the existing pipe 3 using a tip conductor having excavated surface plate portions 41 a to 41 d as shown in FIGS. 16 to 19 instead of the tip conductor 30 having the portion 41.

  For example, in the excavating surface plate portion 41a of the front conductor according to the first modification shown in FIG. 16, the hammer head portion 33, the two intake openings 42a, the front cutter portion 43a, and a plurality of outer peripheral cutter bit portions 44a are provided. In this case, the hammer head 33 is formed substantially in the same manner as the hammer head 33 described above.

  The intake opening 42 a of the first modification is formed to penetrate the excavating surface plate portion 41 a from the front to the rear. Also, the two intake openings 42 a have a symmetrical shape with the hammer head 33 interposed therebetween. In this case, each intake opening 42a is formed to have a shape slightly different from that of the intake opening 42 of the embodiment described above, and the intake opening 42a of the first modification is a front view of the leading conductor. , It is formed in the shape which exhibits a substantially fan shape. Further, the total opening area of the left and right intake openings 42a is set to be a ratio of 6.4% of the entire area of the excavating surface plate portion 41a.

  The face cutter portion 43a of the first modification is formed by melting and fixing the cutting tip, and the surface is continuously provided with irregular asperities. Further, the front cutter portion 43a has a cutter central portion disposed adjacent to the hammer head portion 33, and four cutter linear portions extending radially and continuously from the central portion of the cutter. The whole of the cutter portion 43a is integrally formed.

  The outer peripheral cutter bit portion 44a of the first modified example is formed by continuously attaching a cutter bit from the outer peripheral edge portion of the excavating surface plate portion 41a to the outer peripheral side surface of the body portion in a bending manner. In the first modified example, each outer peripheral cutter bit portion 44a is provided with a larger area exposed to the outside than the outer peripheral cutter bit portion 44 of the embodiment described above.

  Also in the case of crushing the existing pipe and excavating the ground around the existing pipe using the tip conductor of the first modified example having the excavating surface plate portion 41a shown in FIG. 16, similarly to the case of the above embodiment, The hammer head portion 33, the front cutter portion 43a and the outer peripheral cutter bit portion 44a can efficiently perform crushing and digging. In addition, the area of the circular face surface to be excavated with the tip conductor is made larger than the area of the circular cross section of the trunk portion of the tip conductor and the propelling pipe, and the frictional resistance generated between the tip conductor and the propelling pipe and the surrounding ground It can be made smaller. Furthermore, since the two intake openings 42a are provided in the excavated surface plate portion 41a of the front conductor, crushed materials and excavated soil are efficiently taken into the trunk of the front conductor through the intake opening 42a. This can increase the efficiency of fracture and digging by the drilling surface 41a of the leading conductor.

  Next, in the excavating surface plate portion 41b of the front conductor according to the second modification shown in FIG. 17, the hammer head portion 33, the two intake openings 42b, the front cutter portion 43a, and a plurality of outer peripheral cutters A bit portion 44a is provided. In this case, although the size of the intake opening 42b provided in the second modification is different from that of the intake opening 42a of the first modification described above, the hammer head 33, the front cutter 43a, and the outer periphery cutter bit The portion 44a is formed in the same manner as in the first modification.

  In the second modified example, the two intake openings 42 b have a substantially fan-like shape symmetrical about the hammer head 33. In addition, the two intake openings 42b are the above-described embodiment so that the total opening area of the left and right intake openings 42b is 14.7% of the total area of the excavating surface plate portion 41b. And it is formed larger than the case of the 1st modification.

  The tip conductor having the excavating surface plate portion 41b provided with such two intake openings 42b has a larger amount of fragments and excavated soil when excavating the ground around the existing pipe while crushing the existing pipe. Can be efficiently taken into the body of the leading conductor through the take-in opening 42b. For this reason, the leading conductor according to the second modification is suitably used when excavating relatively soft ground.

  Next, FIG. 18 shows an excavating surface plate portion 41c of a front conductor according to a third modification, and FIG. 19 shows an excavating surface plate portion 41d of a front conductor according to a fourth modification.

  In the excavating surface plate portion 41c according to the third modification and the excavating surface plate portion 41d according to the fourth modification, a hammer head 33, two intake openings 42c and 42d, and a front cutter portion, respectively. 43a and a plurality of outer peripheral cutter bit portions 44a are provided. In this case, although the sizes of the intake openings 42c and 42d provided in the third modification and the fourth modification are respectively smaller than the intake opening 42a of the first modification described above, the hammer head The portion 33, the front cutter portion 43a, and the outer peripheral cutter bit portion 44a are formed in the same manner as in the first modification.

  In the third modification, the two intake openings 42 c have a circular arc shape symmetrical about the hammer head 33. Further, the left and right intake openings 42c are formed such that the total opening area thereof is a ratio of 3.1% of the entire area of the excavating surface plate portion 41c. On the other hand, in the fourth modification, the two intake openings 42d have a symmetrical shape with the hammer head 33 interposed therebetween, and the total opening area of these is one of the total area of the excavating surface plate 41d. It is formed to have a ratio of .6%.

  In each of the front conductors having the excavating surface plate portions 41c and 41d according to the third and fourth modifications, the size of the intake openings 42c and 42d is the case of the above-described embodiment or the first modification. Because it is smaller than the above, the strength of the excavating surface plate portions 41c and 41d can be stably secured. Therefore, the front conductors according to the third and fourth modifications are suitably used when excavating relatively hard ground.

1 start shaft 2 reach shaft 3 existing pipe 4 propelling pipe (sheath pipe)
5 main pipe 5a main pipe body 5b widening part 5c connection part 6 spacer band (supporting fixing band)
6a band plate portion 6b mounting piece portion 6c tightening bolt 6d leg portion 11 truck with crane 12 dump truck 13 hydraulic unit 14 generator 15 slip plant 16 line oiler 17 compressor 18 water hose 19 water pump 21 mixer 22 grout pump 22a injection hose Reference Signs List 23 laser transit 30 tip conductor 31 body portion 32 target 33 hammer head portion 33 a hammer bid 34 air hammer device 35 support fixing portion 36 stopper portion 37 air hose 38 guide hose 39 hose fixing portion 41 excavating surface plate portion 41 a to 41 d excavating surface plate portion 42 intake opening 42a to 42d intake opening 43, 43a front cutter 44, 44a peripheral cutter bit 50 propulsion device 51 slide base 52 device body 52a Rolling unit 53 the hydraulic cylinder 54 hydraulic motor 55 operating lever 61 air vent pipe 62 mortar 63 wellhead 64 soil discharge machine (scraper)
65 mortar

Claims (10)

In the propelling pipe laying device for crushing the existing pipe (3) buried in the ground and excavating the ground around the existing pipe (3) and propelling the propelling pipe (4) 4) The leading conductor (30), which is disposed prior to the crushing of the existing pipe (3) and the excavation of the surrounding ground, and propelled the leading conductor (30) and the propulsion pipe (4) from behind In a propelling pipe laying device comprising a propelling device (50)
The front conductor (30) has a cylindrical body portion (31), an excavating surface plate portion (41, 41a, 41b, 41c, 41d) disposed at the tip of the body portion (31), and the body portion (31) having an air hammer device (34) installed in the interior;
Hammer that performs crushing of the existing pipe (3) and excavation of the surrounding ground by impact vibration transmitted from the air hammer device (34) to the excavated surface plate portion (41, 41a, 41b, 41c, 41d) A head portion (33) is disposed, and at least one removal for taking in and discharging crushed material and excavated soil of the existing pipe (3) into the body portion (31) separately from the hammer head portion (33). Inset openings (42, 42a, 42b, 42c, 42d) are arranged,
The excavated surface plate (41, 41a, 41b, 41c, 41d) is provided with a frontal cutter (43, 43a) having irregular asperities on the surface formed by melting and fixing the cutting tip ,
The front cutter portion (43, 43a) having the irregular asperity is formed to be able to crush the existing pipe (3) by a cutting action ,
An outer peripheral cutter bit portion (44, 44a) continuously formed in a bent shape from the outer peripheral edge portion of the excavated surface plate portion (41, 41a, 41b, 41c, 41d) to the outer peripheral side surface of the body portion (31). Is provided ,
Propulsion pipe laying device characterized in that.   The front end face of the hammer head portion (33) has an area of 40% or less of the entire front end face of the front conductor (30) in a front view of the front conductor (30). The propulsion pipe laying device according to 1).   The hammer head portion (33) exceeds the outer diameter of the excavated surface center region including the axial center position of the body portion (31) and the outer diameter of the body portion (31) in a front view of the front conductor (30). The propelling pipe laying apparatus according to claim 1 or 2, which is disposed in a continuous substantially rectangular or substantially oval shaped area including a projecting area projecting outward.   Two take-in openings (42, 42a, 42b, 42c, 42d) are arranged in mutually symmetrical shapes on the left and right of the direction of rotation of the leading conductor (30) in the hammer head part (33) The propelling pipe laying apparatus according to any one of claims 1 to 3.   The total open area of the intake openings (42, 42a, 42b, 42c, 42d) in the front view of the front conductor (30) is equal to that of the excavated surface plate (41, 41a, 41b, 41c, 41d) The propelling pipe laying apparatus according to any one of claims 1 to 4, which is set to 1% or more and 15% or less of the entire area of.   The front cutter portion (43, 43a) is an outer peripheral edge of the excavated surface plate portion (41, 41a, 41b, 41c, 41d) from the central portion of the excavated surface plate portion (41, 41a, 41b, 41c, 41d) The propelling pipe laying device according to any one of claims 1 to 5, wherein the propelling pipe laying device according to any one of claims 1 to 5, which is continuously and radially extended toward the portion. Between the starting shaft (1) and the reaching shaft (2) excavated on the ground surface, the existing pipe (3) buried in the ground is crushed and the ground around the existing pipe (3) is excavated Method of laying the propelling pipe (4)
7. Carrying in and installing the propelling pipe laying device according to any one of claims 1 to 6 in the start shaft (1);
Filling the filling material (62) in the existing pipe (3),
The hammerhead portion (30) of the tip conductor (30) is advanced by rotating the tip conductor (30) of the propelling pipe laying device from the start shaft (1) to the arrival shaft (2) while rotating the tip conductor (30). 33) crushing the existing pipe (3) filled with the filler (62) and excavating the ground around the existing pipe (3);
The fractured portion of the existing pipe (3) and excavated soil through the take-in opening (42, 42a, 42b, 42c, 42d) of the tip conductor (30) and the body portion of the tip conductor (30) (31) Taking in and discharging inside,
A method of laying a propelling pipe, comprising: The propelling pipe (4) which sends water from the ground surface into the leading conductor (30) through the water supply hose (18) and lays the water from the leading conductor (30) to the rear of the leading conductor (30) And the excavated material taken into the body portion (31) from the intake opening (42, 42a, 42b, 42c, 42d) by flowing toward the start shaft (1) via the The method for laying a propelling pipe according to claim 7 , comprising discharging the soil. The existing pipe is installed by inserting and laying the main pipe (5) in the sheath pipe (4), using the propulsion pipe (4) laid by the method of laying a propulsion pipe according to claim 7 or 8 as a sheath pipe. The existing pipe renewal method characterized in that the pipe (3) is renewed to the main pipe (5). A plurality of spacer bands (6) capable of supporting the main pipe (5) at a predetermined position with respect to the sheath pipe (4) before the insertion of the main pipe (5) 5) on the outer peripheral surface of the main pipe (5) at a predetermined interval in the longitudinal direction,
The main pipe (5) to which the spacer band (6) is attached is inserted into the sheath pipe (4), and the main pipe (5) is supported by a plurality of the spacer bands (6), Laying the main pipe (5) with a predetermined gradient in the sheath pipe (4);
Filling the space between the sheath pipe (4) and the main pipe (5) with a core material (65) and fixing the position of the main pipe (5) with respect to the sheath pipe (4);
The existing pipe updating method according to claim 9 , comprising:

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