JP4429875B2 - Replacement method for existing pipes - Google Patents

Description

  The present invention relates to a method for replacing an existing pipe, which is buried in the ground and has a plurality of non-metallic pipes connected by a metal joint, with an update pipe.

  For example, the existing pipe is replaced when the existing pipe is old or when it is desired to replace the pipe with a different diameter. The replacement of the existing pipe is, for example, by excavating the ground to take out the existing pipe and then bury the renewal pipe.

  On the other hand, a rod is inserted into the existing pipe, a cutting blade is attached to the tip of the rod, an update pipe is attached to the cutting blade, and the rod is pulled to operate the existing pipe with the cutting blade. A replacement method in which the renewal pipe is pulled in while being cut from the inside is considered (see Patent Document 1). This replacement method assumes that the existing pipe is made of metal.

By the way, as existing pipes buried in the ground, for example, a composite configuration in which a plurality of non-metallic pipes such as synthetic resin, asbestos or ceramics are arranged in a row and each non-metallic pipe is connected by a metal joint. There is something that has become.
JP-A-11-117676

  In the above conventional example, no replacement is assumed for existing pipes having a composite structure in which a plurality of non-metallic pipes are connected by metal joints. Temporarily, in the case of such an existing pipe, a metal joint cannot be crushed by the replacement method of the conventional example. There is room for improvement here.

  An object of the present invention is to make it possible to easily and quickly replace an existing pipe having a composite structure in which a plurality of non-metallic pipes are buried in the ground and connected by metal joints with a renewal pipe. Yes.

The present invention is a method of replacing an existing pipe formed by connecting a plurality of non-metallic pipes with metal joints embedded in the ground with an update pipe, and provided with two vertical shafts communicating with the existing pipes, Insert the rod with the metal exploration device at the tip into the existing pipe from the one shaft side and send it to the other shaft side to detect the metal joint with the metal exploration device and recognize the position of the metal joint The preparation step is to remove the metal exploration device from the tip of the rod that has reached the other shaft side, and attach a joint crushing device instead, and pull the rod to the one shaft side. in a crushing step of crushing the metal joint from the inside is sent to the location of the recognized metal fittings, while crushing the non-metallic pipe from the inside to the one tube axial direction, the crushed side From the upstream side, characterized in that it comprises an update step of placing the update pipe crushing remains of the existing pipe.

  In this case, it is possible to replace the existing pipe buried in the ground with an update pipe without excavating the soil and taking out the existing pipe. Thereby, after excavating the soil and taking out the existing pipe, the replacement work can be performed easily and quickly compared to the classic method of installing the update pipe. In this way, the time and labor required to replace the existing pipe are reduced, so that the replacement cost can be reduced.

  Preferably, in the preparation step, the metal exploration is performed by providing two shafts communicating with the existing pipe, inserting a rod having a metal exploration device at a tip thereof into the existing pipe from the one shaft side, and sending the rod to the other shaft side. The detection position is recorded after the metal joint is detected by the apparatus.

  In this case, since the exploration operation can be performed only by feeding the rod, the exploration work can be performed easily and quickly.

  Preferably, in the crushing step, a joint crushing device is attached to the tip of the rod, and the joint crushing device is sent to the position of the metal joint recorded in the preparation step to crush the metal joint. .

  In this case, since the crushing operation can be performed only by feeding the rod, the crushing operation can be performed easily and quickly.

  Preferably, in the crushing step, the preparation step is performed by removing a metal exploration device from a tip of the rod that has reached the other shaft side, attaching a joint crushing device instead, and pulling the rod to the one shaft side. It is assumed that the metal joint is crushed by being sent to the position where the metal joint recorded in (1) is present.

  In this case, since the crushing operation can be performed in the process of pulling back the rod sent by the exploration operation, it is possible to omit a useless operation and to perform the crushing operation efficiently and quickly.

  Preferably, in the updating step, the tip end of the rod is inserted from the one shaft side and protruded to the other shaft side, and the tip end side of the drill is attached to the tip end of the rod, and the tip end side of the drill is updated. A pipe is attached, and the rod is pulled back to the one shaft side, and the non-metallic pipe of the existing pipe is expanded and crushed from the inside by the drill, and the renewal pipe is arranged at the crushing mark of the existing pipe. Is done.

  In this case, since the existing pipe can be crushed and the renewal pipe can be installed at the same time, the replacement work can be performed efficiently and quickly.

  According to the present invention, for an existing pipe having a composite structure in which a plurality of non-metallic pipes are buried in the ground and connected by metal joints, an operation for replacing the pipe with an update pipe can be performed without excavating the ground. It can be done easily and quickly. Therefore, the time and labor required to replace the existing pipe are reduced, which can contribute to the reduction of the replacement cost.

  Hereinafter, an embodiment of the present invention will be described with reference to FIGS. In the figure, 1 is soil, and an existing pipe 2 is embedded in the soil 1 substantially in parallel with the ground surface.

  When this existing pipe 2 is aged or when it is desired to replace it with a pipe having a different diameter, the existing pipe 2 is replaced with the renewal pipe 2a.

  The existing pipe 2 has, for example, a composite configuration in which three non-metallic pipes 3, 4, 5 are arranged in a line and connected by metal joints 6, 7. In addition, the renewal pipe 2a has a composite configuration in which three non-metallic pipes 3a, 4a, 5a are arranged in a line and are connected by metal joints 6a, 7a, similarly to the existing pipe 2.

The existing nonmetallic pipes 3 to 5 are made of, for example, a synthetic resin such as polyethylene or vinyl chloride, or a nonmetallic material such as asbestos or porcelain. The non-metallic pipes 3a to 5a to be newly replaced can be made of an appropriate material such as a synthetic resin such as polyethylene or vinyl chloride, or a metal pipe such as steel. The existing metal joints 6 and 7 and the newly replaced metal joints 6a and 7a are generally known, for example, cylindrical shapes that are arranged so as to surround the butt ends of two non-metallic pipes and tightened. belongs to.

  Next, the work and procedure for replacing the existing pipe 2 with the update pipe 2a will be described in detail.

  Moreover, since this excavation method uses the excavation apparatus 10, the metal exploration apparatus 20, the joint crushing apparatus 30, and the drill 40, these structures are demonstrated first.

  The excavation device 10 has a function of feeding and pulling back the long rod 11 while spirally rotating, and generally known devices can be used.

  The metal exploration device 20 has a function of sensing a specific metal, and a generally known metal detector or the like can be used.

  The joint crushing device 30 crushes the metal joints 6 and 7 from the inside. For example, as shown in FIG. 6, hydraulic jacks 32 and 33 are provided at two positions every 90 degrees on the outer periphery of the central base 31. In this configuration, the support legs 34 and 35 are provided at two positions opposite to each of the hydraulic jacks 32 and 33 by 180 degrees. In other words, the joint crushing device 30 is attached to the piston tips of the hydraulic jacks 32 and 33 with the support legs 34 and 35 abutting against the inner circumferences of the metal joints 6 and 7 of the existing pipe 2 to be crushed. The attached sharp members 36 and 37 are protruded outward in the radial direction so as to be crushed from the inside of the metal joints 6 and 7. Although not shown in the drawings, the joint crushing device 30 may have a configuration in which hydraulic jacks are provided at all of a plurality of circumferentially spaced intervals, and is not particularly limited.

  The drill 40 expands and crushes the existing pipe 2. For example, as shown in FIGS. 10 to 12, a cylindrical body 41, a conical part 42 provided at one end of the body 41, and a cone And a rod connecting portion 43 provided at the tip of the portion 42. The outer diameter of the trunk portion 41 is set to be larger than the inner diameter of the existing tube 2 and the outer diameter of the update tube 2 a, and the outer diameter of the rod connecting portion 43 is set to be smaller than the inner diameter of the existing tube 2. The rod connecting portion 43 is formed in a cylindrical shape, and has an inner periphery formed as a female screw hole, and the male screw portion 11a at the tip of the rod 11 is screwed and coupled. At the other end of the body portion 41, a connecting portion 44 is provided on which a connecting member 50 for pulling the update pipe 2a is locked. At several places on the circumference of the conical portion 42, sharp projecting blades 45 called bits are provided. Injecting holes 46a and 46b for discharging a fluid lubricant are provided in several places on the circumference of the conical section 42 and several places on the other end side of the body 41. As this lubricant, water or a material obtained by adding a component called mud or bentonite to water is preferably used.

  In this drill 40, the lubricant in the lubricant tank 60 connected to the excavation apparatus 10 is introduced through a passage 11 b provided at the center of the rod 11. The drill 40 is provided with an introduction passage 40a connected to the central passage 11b of the rod 11 at the center thereof. The introduction passage 40a is connected to each injection hole through passages 40b and 40c extending in the radial direction. 46a and 46b are connected in communication.

  Specifically, the replacement method in this embodiment includes a preparation step for recognizing the existence positions of the metal joints 6 and 7 in the existing pipe 2, a crushing step for crushing the recognized metal joints 6 and 7 from the inside, An updating step of disposing the renewal pipe 2a on the crushing trace of the existing pipe 2 from the upstream side in the crushing direction while crushing the non-metallic pipes 3 to 5 in the existing pipe 2 from the inside to one side in the pipe axis direction.

  Hereinafter, each process will be described in detail.

(Preparation process)
As shown in FIG. 1, a starting pit 8 and a reaching pit 9 that are connected to the existing pipe 2 by a excavation device 10 are provided at appropriate locations on the soil 1. The start shaft 8 is used as a shaft on the side where the rod 11 is inserted, and the arrival shaft 9 is used as a shaft on the side where the rod 11 reaches. In this embodiment, from the relationship in which the start pit 8 and the arrival pit 9 are formed to be relatively small, particularly on the arrival pit 9 side, in order to smoothly introduce the renewal pipe 2a, from the side wall portion of the arrival pit 9 An inclined groove 9a reaching the ground surface is excavated.

  Then, as shown in FIG. 2, the rod 11 is spirally rotated by the excavating device 10 and sent out to be inserted into the start pit 8 while excavating the soil 1. A metal exploration device 20 is attached to the tip of the rod 11 arranged in the start pit 8, and the metal exploration device 20 is inserted into the existing pipe 2 from the start pit 8 side as shown in FIG. By sending to the side, the metal exploration device 20 detects the metal joints 6 and 7 and the operator records the position information of the detection point. You may make it memorize | store this detection point automatically in the memory | storage part with which the control system (illustration omitted) of the metal exploration apparatus 20 is equipped.

  After this, the tip of the rod 11 is pulled back to the start shaft 8, and the metal exploration device 20 is removed from the tip.

(Crushing process)
As shown in FIG. 4, after the joint crushing device 30 is attached to the tip of the rod 11 located on the start pit 8 side, as shown in FIG. The metal joints 6 and 7 are sequentially crushed by the joint crushing device 30.

  In this way, as shown in FIG. 7, the joint crushing device 30 attached to the tip of the rod 11 is fed until it protrudes into the access shaft 9, and the joint crushing device 30 is removed from the rod 11.

(Update process)
As shown in FIG. 8, a drill 40 is attached to the tip of the rod 11 existing in the access shaft 9. At this time, the male screw part 11a at the tip of the rod 11 is attached by being screwed into the female screw hole of the rod connecting part 43 of the drill 40. Further, the renewal tube 2 a is attached to the connecting portion 44 on the other end side of the body portion 41 of the drill 40 via the connecting member 50.

  Then, as shown in FIG. 9 and FIG. 10, the rod 11 is pulled back to the start pit 8 side, so that the non-metallic pipes 3 to 5 in the existing pipe 2 are sequentially expanded and crushed from the inside by the drill 40. However, the renewal pipe 2a is arranged on the crushing trace of the existing pipe 2.

  When the rod 11 is pulled back, since the rod 11 is spirally rotated, the drill 40 is rotated, and the non-metallic pipes 3 to 5 are crushed while the diameter of the nonmetallic pipes 3 to 5 is increased by the protruding blade 45 of the rotating drill 40. Will be.

Moreover, in the process of pulling back the drill 40, the fluid lubricant is substantially continuously formed from the plurality of injection holes 46a provided in the conical portion 42 and the plurality of injection holes 46b provided in the rear end of the body portion 41. To be injected. In this case, since the lubricant injected from the injection hole 46a of the conical portion 42 of the drill 40 flows between the drill 40 and the existing pipe 2 as the drill 40 advances, resistance when the drill 40 advances is reduced. At the same time, the ground from the crushed debris of the existing pipe 2 is soaked into the soil 1 on the outer diameter side to loosen the ground, and as a result, the crushed debris of the existing pipe 2 is easily pushed to the outer diameter side of the drill 40. Further, the lubricant sprayed from the injection hole 46b at the rear end of the body portion 41 of the drill 40 flows between the crushing debris of the existing pipe 2 and the renewal pipe 2a as the drill 40 proceeds, and crushes the existing pipe 2. Since the soil is soaked into the soil 1 on the outer diameter side from the wreckage, the renewal pipe 2a can easily push the crushed debris of the existing pipe 2 toward the outer diameter side of the drill 40, and the renewal pipe 2a Resistance is reduced.

  If it does in this way, as shown in FIG. 13, the existing pipe | tube 2 embed | buried in the soil 1 can be replaced with the update pipe | tube 2a.

  As explained above, the excavation pipe 8a is simply excavated in the soil 1 and the existing pipe 2 in the soil 1 is crushed and left in the soil 1 after that. It is installed.

  In particular, in the preparation step, the presence position of the metal joints 6 and 7 is recognized only by performing the feeding operation of the rod 11, and in the crushing step, the remote operation of the joint crushing device 30 is performed simultaneously with the feeding operation of the rod 11. By doing so, the metal joints 6 and 7 are crushed. Further, in the renewal process, the non-metallic pipes 3 to 5 are crushed and the renewal pipe 2a is installed at the same time only by feeding the rod 11. I have to.

  Therefore, for the existing pipe 2 having a composite structure in which a plurality of non-metallic pipes 3 to 5 are connected by metal joints 6 and 7 and are buried in the ground, the work to replace the same update pipe 2a is performed. It can be done easily and quickly. In particular, in the renewal process, as the drill 40 advances, the lubricant is discharged from the downstream side and the upstream side in the traveling direction, so that the crushing of the existing pipe 2 and the installation of the renewal pipe 2a can be performed smoothly and quickly. It is possible to perform the update work smoothly.

  Thus, since excavation of the soil 1 and the existing pipe 2 is taken out, the replacement work can be performed easily and quickly compared to the classic method of installing the renewal pipe 2a. This is advantageous in reducing the replacement cost.

  Hereinafter, other embodiments of the present invention will be described.

  (1) In the above replacement method, the transition from the preparation step to the crushing step may be performed as follows. That is, although not shown in the drawing, the metal exploration device 20 is removed from the tip of the rod 11 positioned in the start shaft 8 without pulling the rod 11 that has reached the start shaft 8 in the preparation step back to the access shaft 9. Instead, the joint crushing device 30 is attached. Then, by pulling the rod 11 toward the reaching pit 9 side, the metal joints 6 and 7 are sequentially crushed by sequentially sending them to the existing positions of the metal joints 6 and 7 recognized in the preparation step. In this case, since the crushing process can be performed in the process of pulling back the rod 11 sent in the exploration operation in the preparation process, it is possible to omit a useless operation related to the feeding back of the rod 11, and the replacement work can be performed quickly and efficiently. You can do it.

(2) In the above replacement method, the crushing step and the updating step can be performed simultaneously. In other words, although not shown, for example, in the preparation process, in the state where the presence position of the metal joints 6 and 7 is recognized and the rod 11 to which the metal exploration device 20 is attached has reached the start shaft 8 side, this start shaft The metal exploration device 20 is removed from the tip of the rod 11 located in the starting pit 8 without pulling the rod 11 reaching the reaching shaft 9 back to the arrival shaft 9, and the joint crushing device 30 and the drill are attached to the tip of the rod 11. 40 and the update pipe 2a are attached in this order. Then, the metal joints 6 and 7 and the non-metallic pipes 3a to 3c recognized in the preparation process are sequentially crushed by pulling the rod 11 to the arrival mine 9 side with the excavating device 10, and the crushing trace is obtained. The update pipe 2a is installed. In this case, since the crushing step and the updating step can be performed at the same time in the process of pulling back the rod 11 sent by the exploration operation in the preparation step, it is possible to omit a useless operation related to the feed back of the rod 11, and the replacement work. Can be performed more efficiently and quickly.

  (3) In the above embodiment, the example in which the injection holes 46a and 46b are provided in the rear end of the body part 41 and the conical part 42 of the drill 40, respectively, is given. , Only one of the injection holes 46a (46b) may be provided.

It is explanatory drawing which shows the initial stage of a preparation process by one Embodiment of the replacement construction method of the existing pipe which concerns on this invention. It is explanatory drawing which shows the continuation of FIG. FIG. 3 is an explanatory diagram showing a continuation of FIG. 2. It is explanatory drawing which shows the initial stage of the crushing process following FIG. It is explanatory drawing which shows the continuation of FIG. FIG. 6 is an arrow view showing an enlarged cross section taken along line (6)-(6) in FIG. 5. It is explanatory drawing which shows the continuation of FIG. It is explanatory drawing which shows the initial stage of the update process following FIG. It is explanatory drawing which shows the continuation of FIG. It is explanatory drawing which shows a mode that it is crushing with the drill of FIG. It is the perspective view which looked at the drill of FIG. 10 from the front end side. It is the perspective view which looked at the drill of FIG. 11 from the rear end side. It is explanatory drawing which shows the state which replacement | exchange completed.

Explanation of symbols

1 soil
2 Existing pipes 3-5 Non-metallic pipes of existing pipes 6, 7 Metal fittings of existing pipes
2a Renewal pipe 3a-5a Non-metallic pipe for renewal pipe 6a, 7a Metal fitting for renewal pipe
8 Start pit
9 Reaching pit 10 Drilling device 11 Rod 20 Metal exploration device 30 Joint crushing device 40 Drill

Claims (2)

It is a method of replacing an existing pipe that is buried in the ground and connected with a plurality of non-metallic pipes with metal joints, with an update pipe,
Two shafts communicating with the existing pipe are provided, and a metal joint is detected by the metal exploration device by inserting a rod attached with a metal exploration device at the tip from the one shaft side into the existing pipe and sending it to the other shaft side. On top of that, a preparation process for recognizing the existence position of the metal joint,
The presence of the metal joint recognized in the preparation step by removing the metal exploration device from the tip of the rod that has reached the other shaft side, attaching a joint crushing device instead, and pulling the rod to the one shaft side Crushing step of crushing the metal joint from its inside by sending it to a position ;
Replacement of an existing pipe, including an update step of arranging an update pipe on the crushing mark of the existing pipe from the upstream side in the crushing direction while crushing the non-metallic pipe from the inside to one side in the pipe axis direction Construction method. It is a method of replacing an existing pipe that is buried in the ground and connected with a plurality of non-metallic pipes with metal joints, with an update pipe,
Providing two vertical shafts communicating with the existing pipe, and recognizing the existence position of the metal joint in the existing pipe; and
Crushing step of crushing the recognized metal joint from the inside;
Insert the tip of the rod from the one shaft side and project it to the other shaft side. Attach the tip of the drill to the tip of the rod and attach the renewal tube to the rear end of the drill. A renewal step of disposing the renewed pipe on the crushing mark of the existing pipe while expanding and crushing the nonmetallic pipe of the existing pipe from the inside by pulling back to the shaft side Tube replacement method.

Images