JP3611993B2 - Propulsion method using a small bore shaft - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a small-diameter propulsion method used for a small-diameter reaching shaft.
[0002]
[Prior art]
In general, the propulsion method is a method of installing a blade at the tip of a pipe, digging while pushing the pipe into the ground with the thrust of a hydraulic jack installed in the start shaft, and laying the pipe. -Adopted for crossing work across tracks, rivers and irrigation canals, etc., and has advantages such as not obstructing traffic, reducing noise and vibration, and being economical.
[0003]
In this propulsion method, shafts are provided on the start side and the arrival side, respectively, and are used for the manhole for management after construction.
[0004]
In particular, this start shaft is used for starting or propulsion reaction force, and is used for entering and exiting workers, loading and unloading of materials and equipment and unloading excavated sediment, etc. It is used for the recovery of etc.
[0005]
By the way, various methods have been developed for such a propulsion method. For example, the towing method performs horizontal boring in advance between the starting shaft and the reaching shaft, and through the towing wire, This is a method of pulling the tube.
[0006]
A pipe-in-pipe method using such a traction method has been proposed (see Japanese Patent Application Laid-Open No. 6-81980).
[0007]
In another example of such a propulsion method, a sheath pipe using a small-diameter propulsion method and a PVC sewage main pipe or a mounting pipe (hereinafter referred to as a mounting pipe on behalf of these) inserted into the sheath pipe. A combined pipe-in-pipe method is known.
[0008]
Regarding the pipe-in-pipe method in which such a sheath pipe and a mounting pipe are combined, the present applicant has made the following proposal (Japanese Patent Laid-Open No. 9-196232).
[0009]
In FIG. 4, reference numeral 100 denotes a sheath pipe, which is used to reduce the width (for example, 900 mm) of the start shaft (1) (see FIG. 1) and to use a small hydraulic jack (not shown). One of 100 is constituted by a steel pipe having a receiving port 101 having a pipe length of about 700 mm.
[0010]
Then, when a large number of steel pipes are driven and connected sequentially from the starting shaft (1) to the natural ground with the receiving port 101 on the leading side by a hydraulic jack, and pushed through to the reaching shaft (2) (see FIG. 1), The installation of the sheath tube 100 is completed.
[0011]
Next, an inner tube, that is, a mounting tube 102 having a nominal diameter of 150 mmφ is sequentially inserted into the laid sheath tube 100. The attachment tube 102 is composed of a PVC tube with a receiving port 103 whose effective length is about 600 mm.
[0012]
In order to insert the attachment tube 102 into the sheath tube 100, the above-described hydraulic jack is used to sequentially insert and connect the receiving port 103 toward the leading side.
[0013]
Then, a spacer 104 is interposed between the attachment tube 102 and the sheath tube 100 to form a predetermined gradient. The spacer 104 includes two split rings that sandwich the attachment tube 102, and It consists of a pair of pillars 105 and 105 erected at the joint of these two split rings.
[0014]
When a predetermined gradient is obtained in the attachment tube 102 by the attachment position of the column 105 of the spacer 104, a filler is injected into the space between the sheath tube 100 and the attachment tube 102, and this gradient is fixed.
[0015]
[Problems to be solved by the invention]
However, not only in such pipe-in-pipe method, but in any propulsion method, the vertical shaft is the main shaft horizontal sheet pile method, steel sheet pile method, column pile pile method, liner plate method, caisson method, etc. Since both require considerable estate for construction, it is difficult to open such shafts in narrow areas.
[0016]
In particular, when laying a mounting pipe across a irrigation canal, aside from starting shafts, it is not only limited to narrow spaces, but it is difficult to open construction shafts, and construction work is difficult. is there.
[0017]
Therefore, the present inventors have created the present invention to solve such problems.
[0018]
[Means for Solving the Problems]
The gist of the present invention is as follows. 1) A method in which a start shaft and a reach shaft are communicated with a sheath pipe laid by a small-diameter propulsion method, and a sewer pipe having a predetermined gradient is inserted into the sheath pipe from the start shaft. Then, the above-mentioned vertical shaft is made into a small-diameter shape incapable of entering and exiting an operator who performs the above-mentioned small-diameter propulsion method, and the pipe body of the starting inverter or elbow or bend pipe suspended by the above-mentioned vertical shaft is Utilizes a simple traction method that pulls the pipe body by pulling a rope with a locking piece that is engaged with the pipe body on the leading side of the sewer pipe facing the reaching shaft, from the start shaft side. In the propulsion method using a small-diameter reach shaft that is connected, 2) the sewage pipe is used as a mounting pipe, and the pipe body is a public gutter with a starting inverter. There is a propulsion method using the small-diameter reach shaft according to claim 1, 3) In the construction method in which the starting shaft and the reaching shaft are communicated with a sheath pipe laid by a small-diameter propulsion construction method, and then a mounting pipe having a predetermined gradient is inserted into the sheath pipe from the starting shaft. The vertical shaft has a small diameter incapable of entering / exiting the operator performing the small-diameter propulsion method, and a check tube provided with a start-inverted tubular body at the lower end of the vertical shaft according to the inclination of the mounting pipe. A swing center is defined and the suspension pipe is suspended so as to be swingable, and the outlet of the pipe body of the starting inverter is swung and connected to the leading side of the mounting pipe facing the reach shaft. It is in the propulsion method using a small diameter reaching shaft.
[0019]
DETAILED DESCRIPTION OF THE INVENTION
The construction method of the embodiment of the present invention will be described in detail according to the sewerage facility of the attached drawings.
[0020]
1 is a cross-sectional view of a sewerage facility to which an embodiment of the present invention is applied, FIG. 2 is an explanatory diagram of one construction method of FIG. 1, FIG. 3 is a main part diagram of FIG. 1, and FIG. (B) is a longitudinal cross-sectional view, (C) is another main part view, and the parts common to the prior art and the conventional example shown in FIG. There is a need to.
[0021]
The sewerage facility to which the construction method according to the embodiment of the present invention is applied is configured such that a downstream start shaft 1 and an upstream reach shaft 2 are driven by a small-diameter propulsion method that does not carry out excavated sediment from the reach shaft 2. It is communicated by a sheath tube 3 that is inserted and connected, and a sewage pipe, that is, a mounting pipe 4 is laid in the sheath tube 3, and in particular, a small diameter that prevents the access shaft 2 from entering and exiting a person It is configured as (small opening or small diameter), and its opening space (land) is reduced, and after completion of the construction method, it is used as a public burial place.
[0022]
The reach shaft 2 is inaccessible to humans and connects the public pipe 5 having the starting point and the mounting pipe 4 to the starting point 6 using the simple traction method (using a traction device). (It is a construction method that is pulled manually.) And is connected to the mounting tube 4. At the time of this connection, the upper end of the public inspection cylinder 11 is operated from the ground to assist in accordance with the simple traction method. As a result, the mounting pipe 3 can be connected to the public mass 5 across the irrigation channel 7.
[0023]
Next, this construction method is described in detail together with sewerage facilities.
The start shaft 1 is a space that can accommodate a small hydraulic jack (not shown), for example, a lightweight steel sheet pile method having a width of about 900 mm in the direction of the reach shaft 2, and has a depth near the water channel 7. Even if it is constructed to be about 3 m, the water stoppage is improved.
[0024]
The reach shaft 2 is constructed by using a PVC pipe 2A having a diameter of about 500 mm after the establishment of the natural ground.
[0025]
The sheath tube 3 is configured by sequentially driving and connecting steel tubes with openings (diameter of about 300 mmφ) with a hydraulic jack as in the conventional example.
[0026]
The mounting tube 4 is composed of a large number of rubber ring receiving piece straight receiving pipes (SRM150) 4A, 4A, etc. made of polyvinyl chloride pipes having a diameter of about 100 mmφ to 150 mmφ, and the rubber ring receiving port on the downstream side of the mounting tube 4 can be freely received. It is connected to a sewage main pipe 10 through a pipe 8 and a rubber ring receiving branch pipe 9.
[0027]
The start shaft 1 and the reach shaft 2 are provided at an interval of about 4 m across the water channel 7.
[0028]
The public masu 5 is composed of a starting inverter 6 made of synthetic resin such as vinyl chloride and an inspection cylinder 11, and this public mast 5 is very close to the building 22 and opens the reaching shaft 2. It is buried in a land where there is not enough room.
[0029]
In addition, an openable / closable sealing lid 23 is provided at the upper end of the opening of the inspection cylinder 11, and this sealing lid 23 is covered with a cast iron protective lid (not shown) and protected from road loads and the like. This base of the protective lid is placed on a donut-shaped portion between the PVC pipe 2 </ b> A and the inspection cylinder 11. Therefore, this stand is guided by the PVC pipe 2A to prevent horizontal movement.
[0030]
As shown in FIGS. 3 (A) and 3 (B), the starting inverter 6 is integrally provided with an outlet 13 in a lateral direction along the surface of the inverter 12, and the inspection cylinder 11 has a drainage in the house. An inflow port (not shown) connected to a pipe (not shown) is provided. Of course, the PVC pipe 2A is also passed through this in-house drain pipe.
[0031]
As shown in FIGS. 3 (A) and 3 (B), the detailed structure of the starting point inverter 6 is entirely made of synthetic resin, particularly made of PVC injection molding, and the inspection tube 11 can be simply inserted from above. A rubber ring socket connection port 14 for an upward inspection cylinder, a lateral opening 13A, for example, 150 mm.phi. Provided along the surface of the inverter 12, and a guide concentrically protruding from the outer periphery of the differential opening 13A. The rubber ring is composed of a cylinder 15 and a bottom plate 16 on which the starting inverter 6 is placed. In particular, the rubber ring is formed in the donut-shaped space 17 formed by the opening 13A and the guide cylinder 15. The rubber ring receiving portion of the receiving piece receiving tube 4A (the outer diameter of the rubber ring receiving portion 18 is 191 mmφ if the nominal diameter of the rubber ring receiving piece receiving tube 4A is 150 mmφ) can be slidably inserted. It is like that.
[0032]
In addition, since this insertion uses the simple traction method or the swing operation of the inspection tube 11 as described above, the tube length of the guide tube 15 is made slightly longer than the insertion port 13A, and the bell mouth 19 is attached to the end of the tube. It is easy to guide and guide the insertion.
[0033]
The guide tube 15 is provided by fixing a short pipe with a bell mouth 19 to the ready-made starting point inverter 6 by welding, or by providing a short pipe with the bell mouth 19 and joining it. .
[0034]
Next, the simple traction method will be described.
Using this simple traction method, at a depth of about 3 m from the ground surface, the insertion opening 13A of the starting inverter 6 is connected to the rubber ring receiving piece 4A of the rubber ring receiving piece receiving pipe 4A on the leading side of the mounting pipe 4. Insertion into the mouth 18 is performed as follows.
[0035]
As described above, the rubber ring receiving piece receiving straight pipe 4A is sequentially inserted from the start shaft 1 and connected to the sheath pipe 3 to form the mounting pipe 4, and the rubber ring receiving part 18 on the leading side thereof is reached. Let it face the shaft 2.
[0036]
Next, the starting invert 6 connected to the inspection cylinder 11 is lowered from the reaching shaft 2, and the guide cylinder 15 of the starting invert 6 is concentrically opposed to the rubber ring receiving portion 18. Next, the inspection cylinder 11 is operated from the ground, and only the guide cylinder 15 is inserted into the rubber ring receiving portion 18.
[0037]
Subsequently, when a bendable rod rod (not shown) having a flexible portion such as a spiral body is suspended from the inspection tube 11 of the reaching shaft 2 and pushed in, the flexible portion enters the attachment tube 4. It is guided and penetrates to the start shaft 1 side. This rod bar functions as a so-called sewing needle.
[0038]
Next, when the rod rod is pulled out from the start shaft 1 side, the rope 20 is connected to the base end of the rod rod. And passes through the mounting tube 4.
[0039]
In the middle of the rope 20, an inspection piece 11 can be hung, but an engagement piece, for example, a short tube 21, is provided to be engaged with the insertion port 13A of the starting inverter 6 without being bent. Therefore, when the operator on the start shaft 1 side pulls the rope 20 as indicated by the arrow a, the starting point inverter 6 is also pulled as indicated by the arrow b, while being guided by the bell mouth 19 of the guide tube 15. The gap 13A can be inserted into the rubber ring receiving portion 18 against the elasticity of the rubber ring.
[0040]
Therefore, the public mast 5 can be connected to the mounting pipe 4, but at the time of this insertion, another operator grasps the upper end of the inspection cylinder 11 while visually observing from the ground, and the guide cylinder 15 and the rubber ring receiving portion 18 are connected. If centering is performed, the insertion can be easily performed.
[0041]
Of course, this centering can be determined in advance by the gradient adjustment amount of the spacer 104 and the thickness of the bottom plate 16.
[0042]
Then, after connecting the public mass 5 and the mounting pipe 4, the rope 20 from which the rod bar has been separated is pulled up from the reaching shaft 2 side.
[0043]
The starting point inverter 6 may be a simple elbow or a bend pipe, and these are collectively referred to as a pipe body in this specification.
[0044]
In addition, attention is paid to the provision that the slope of the mounting pipe 4 is generally required to be 10 ‰ or more for the connection between the public mast 5 and the mounting pipe 4, that is, the leading end of the mounting pipe 4 is directed upward. In addition, since the inclination and the embedment depth of the mounting tube 4 can be accurately determined by the sheath tube 3, the inspection tube 11 with the starting point inverter 6 (fixed with a rubber band) is provided on the inspection tube 11 based on these. When the center of swing of the inspection cylinder 11 is set as a fulcrum of the inspection cylinder 11 and the upper end of the inspection cylinder 11 is forcibly oscillated using the lever principle, the opening 13A of the starting point inverter 6 becomes a circular arc. The insertion port 13A can be inserted against the elasticity of the rubber ring in the rubber ring receiving part 18 of the mounting tube 4 that moves and is fixed in the tangential direction.
[0045]
Therefore, if a rocking center forming member (for example, one in which the spacer is thinned) is set on the inner surface of the PVC pipe 2A of the access shaft 2 at a position corresponding to the upward inclination angle of the mounting pipe 4, that position In addition, even if the reach shaft 2 is deep and difficult to see, the public mass 5 can be connected to the mounting pipe 4 without using a rope or the like.
[0046]
【The invention's effect】
According to the present invention, the diameter of the upstream reach shaft can be reduced, and the establishment site can be reduced.
[0047]
In addition, the connection of the pipe suspended from the arrival shaft or the start-up-invert pipe to the sewage pipe or mounting pipe is performed by a simple traction method or forced oscillation of the inspection cylinder, so the arrival shaft is small. Pipe laying is possible even when the diameter is increased.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a sewerage facility to which an embodiment of the present invention is applied.
FIG. 2 is an explanatory diagram of one construction method of FIG.
3A and 3B are main part views of FIG. 1, in which FIG. 1A is a partially omitted plan view, FIG. 3B is a longitudinal sectional view, and FIG.
FIG. 4 is a conventional example.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Start shaft, 2 ... Reaching shaft, 3 ... Shell tube, 4 ... Mounting tube, 5 ... Public mass, 6 ... Starting point inverter, 13 ... Outlet

Claims (3)

The a starting pit and arrival pit, after which communicates with sheath pipe which is laid by the small-diameter jacking method, in the method for inserting the sewer pipe a predetermined gradient from the starting pit in the sheath tube,
The reach shaft is made into a small diameter that cannot be entered and exited by an operator who performs the small-diameter propulsion method, and a starting- invert or elbow or bend pipe suspended from the reach shaft is connected to the sewer pipe . Using a simple traction method that pulls the rope from the start vertical shaft side by pulling a rope interposing a locking piece for locking to the pipe body on the leading side facing the reaching shaft, A propulsion method using a small bore shaft. 2. The propulsion method using a small-diameter reaching shaft according to claim 1, wherein the sewer pipe is a mounting pipe, and the pipe body is a public tank having a starting inverter. The a starting pit and arrival pit, after which communicates with a sheath tube which is laid by the small-diameter jacking method, in the method for inserting the attachment tube of predetermined slope from the starting pit in the sheath tube,
The reach shaft has a small diameter that cannot be used by an operator who performs the small-diameter propulsion method, and a check tube provided with a start-inverted tubular body at the lower end of the reach shaft is provided with a gradient of the mounting tube. A swing center is determined in accordance with the suspension, and is suspended so as to be swingable, and the outlet of the tubular body of the starting inverter is swung and connected to the leading side of the mounting pipe facing the reach shaft. A propulsion method using a small diameter reach shaft characterized by

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