JP7515881B2 - Pipe construction method - Google Patents

Description

The present invention relates to a pipe construction method for forming a pipe inside an existing pipe, such as a sewer pipe, a drainage pipe, or a storm water pipe, that is buried underground.

There have been many proposals for methods of forming a tubular body inside an existing pipe without digging up the existing pipe buried underground. Examples of methods related to the present invention include the "existing pipe rehabilitation method" described in Patent Documents 1 and 2, and the "existing pipe rehabilitation method" described in Patent Document 3.

The "existing pipe rehabilitation method" described in Patent Document 1 is a pipe rehabilitation method using a pipe rehabilitation material to form a rehabilitation pipe to repair an existing pipe,
The pipe rehabilitation material is composed of a cylindrical fiber cloth, a thermosetting resin impregnated into the fiber cloth, a cylindrical inner tube covering the inner peripheral surface of the fiber cloth, and a cylindrical outer tube covering the outer peripheral surface of the fiber cloth. The pipe rehabilitation material preparation process includes inserting a pulling string into the cylindrical outer tube and inserting the cylindrical inner tube into the cylindrical fiber cloth, a resin impregnation process in which one end of the outer tube is tied to the fiber cloth and one end of the inner tube with the pulling string and the fiber cloth is impregnated with thermosetting resin, and after the resin impregnation, the outer tube is turned inwards and outwards and reversed to impregnate the thermosetting resin. the outer tube attachment process covering the outer peripheral surface of the fiber cloth impregnated with thermosetting resin with an outer tube; a pipe rehabilitation material pulling process in which a pipe rehabilitation material consisting of the outer tube, fiber cloth impregnated with thermosetting resin, and an inner tube is inserted into an existing pipe by pulling a towing string; a pipe rehabilitation material expanding process in which, after insertion, a fluid is fed into the inner tube to expand the diameter of the pipe rehabilitation material by fluid pressure; a resin hardening process in which the thermosetting resin of the pipe rehabilitation material is hardened by maintaining the fluid feed; and a pipe mouth processing process in which the excess end of the pipe rehabilitation material is processed after the resin has hardened.

The "existing pipe rehabilitation method" described in Patent Document 2 is a method for rehabilitating an existing pipe, in which the inner wall of the existing pipe is covered with a lining material for rehabilitating an existing pipe, the lining material comprising a tubular resin-absorbing substrate having a liquid-tight outer surface and impregnated with a curable resin composition, and a tubular sheet that is folded and placed inside the tubular resin-absorbing substrate and has a circumferential length capable of covering the inner surface of the tubular resin-absorbing substrate,
The method includes the steps of inserting a lining material for rehabilitating an existing pipe into an existing pipe, introducing a fluid into the folded tubular sheet of the inserted lining material, expanding the tubular sheet by the fluid pressure, and pressing the lining material against the inner wall of the existing pipe, curing the impregnated curable resin composition while the lining material is pressed against the inner wall of the existing pipe to cover the inner wall of the existing pipe, and peeling off the expanded tubular sheet while inverting it.

The "method of rehabilitating existing pipes" described in Patent Document 3 involves introducing a tubular lining material into a sewer pipe (main sewer pipe) located between manholes, then closing both ends of the lining material with blocking members to form a closed space, introducing compressed air from a working device through a hose into the closed space, expanding the diameter of the tubular lining material and bringing its outer surface into contact with the inner surface of the sewer pipe, and then irradiating the lining material from inside with light from a lamp connector to harden the curable resin composition contained in the lining material, forming a rehabilitated pipe with the lining material hardened inside the sewer pipe.

JP 2017-80897 A JP 2017-80972 A JP 2018-65356 A

The "existing pipe rehabilitation method" described in Patent Documents 1 and 2 and the "existing pipe rehabilitation method" described in Patent Document 3 each have their own advantages, but when carrying out these rehabilitation methods, they all require specialized materials and machinery that are not generally available, so their adoption can be difficult depending on the conditions at the construction site and construction cost constraints.

In other words, the "pipe rehabilitation material consisting of a tubular fiber cloth, a thermosetting resin impregnated into the fiber cloth, a tubular inner tube covering the inner surface of the fiber cloth, and a tubular outer tube covering the outer surface of the fiber cloth" and the "device that pumps a fluid into the inner tube and expands it by the fluid pressure" used in the "existing pipe rehabilitation method" described in Patent Document 1 are not general-purpose and require special techniques for construction.

In addition, the "lining material for rehabilitating existing pipes comprising a tubular resin-absorbing substrate impregnated with a curable resin composition and a tubular sheet that is folded and placed inside the tubular resin-absorbing substrate and has a circumferential length sufficient to cover the inner surface of the tubular resin-absorbing substrate" used in the "existing pipe rehabilitation method" described in Patent Document 2, as well as the "compressor that expands the diameter of the tubular sheet and the boiler that hardens the curable resin composition impregnated in the tubular resin-absorbing substrate" are not general-purpose and require special techniques for construction.

Furthermore, the "tubular lining material introduced into an existing sewer pipe," "the working device that introduces compressed air via a hose into the closed space formed by closing off both ends of the tubular lining material to expand the diameter of the tubular lining material," and "the lamp connector that irradiates light onto the lining material from inside the lining material" used in the "existing pipe rehabilitation method" described in Patent Document 3 are not general-purpose, as mentioned above, and require special techniques for construction.

The problem that this invention aims to solve is to provide a pipeline construction method that can form a pipeline inside an existing pipe using general-purpose civil engineering construction materials and civil engineering construction machinery, making construction easy and shortening the construction period.

The pipeline construction method according to the present invention is a pipeline construction method for forming a pipeline along an existing pipe to be constructed, which is buried underground between a starting shaft and a reaching shaft, from inside the starting shaft to the reaching shaft,
a step of disposing a pressing means having a pressing part capable of moving forward and backward relative to the starting side opening of the existing pipe to be worked on, the pressing means being connected to a reaction means engaged with the opening of the existing pipe, inside the existing pipe opening 180 degrees opposite the starting side opening of the existing pipe to be worked on, the pressing means being connected to the reaction means engaged with the opening of the existing pipe;
a first tubular body carrying process for carrying a first tubular body, the length of which is smaller than the inner diameter of the starting shaft and the outer diameter of which is smaller than the inner diameter of the existing pipe, into the starting shaft, and positioning the tip opening and base opening of the first tubular body toward the starting side opening and the existing pipe opening, respectively;
a first tubular body inserting process in which a pressing portion of the pressing means is advanced toward the starting side opening to press the base end opening of the first tubular body, and the first tubular body is inserted from the starting side opening into the existing pipe to be constructed with its tip opening side facing the arrival side shaft;
a second tubular body carrying process in which, when the base end opening of the first tubular body moves to the starting side opening, the pressing portion of the pressing means is retracted from the starting side opening, and then a second tubular body having a length smaller than the inner diameter of the starting side shaft and an outer diameter smaller than the inner diameter of the existing pipe is carried into the starting side shaft, and the tip end opening and base end opening of the second tubular body are brought into a state facing the starting side opening and the existing pipe opening, respectively;
a second tubular body connecting step of connecting a distal end opening of the second tubular body to a proximal end opening of the first tubular body;
The method is characterized in that after completion of the second tubular body connecting process, a connecting tubular body moving process is provided in which the pressing portion of the pressing means is advanced toward the starting side opening to press the base end opening of the second tubular body, and the first tubular body and the second tubular body are moved along the existing pipe to be constructed toward the arrival side shaft.

In the pipeline construction method, once the base end opening of the second tubular body has moved to the starting side opening through the connecting tubular body moving step, the pressing portion of the pressing means is retracted from the starting side opening, and then three steps similar to the second tubular body carrying step, the second tubular body connecting step, and the connecting tubular body moving step are repeated in sequence to allow the tip opening of the first tubular body to reach the destination side opening of the existing pipe to be constructed.

In the above-mentioned pipeline construction method, the reaction means can be one that includes a locking member that is locked to the periphery of the opening of the existing pipe, and a holding member that extends from the locking member toward the inside of the existing pipe and holds the pressing means at a fixed position within the existing pipe.

In the above-mentioned pipeline construction method, the first tubular body and the second tubular body can have a female thread portion on the outer periphery of the tip opening (or the base opening), and a male thread portion on the inner periphery of the base opening (or the tip opening) that can be screwed into the female thread portion.

In the above-mentioned pipeline construction method, the pressing means can be a hydraulic jack with a pressing part that moves forward and backward using an oil supply from a compressor placed on the ground part of the starting shaft via an oil supply pipe.

The present invention provides a pipeline construction method that allows for the formation of a pipeline within an existing pipe using general-purpose civil engineering construction materials and civil engineering construction machinery, simplifies construction, and shortens the construction period.

1 is a vertical cross-sectional view showing a process of a pipeline construction method according to an embodiment of the present invention, with some parts omitted. 2 is a vertical cross-sectional view taken along line AA in FIG. 1, with some parts omitted. FIG. 2 is a vertical cross-sectional view showing a work process after the work shown in FIG. 1, with some parts omitted. FIG. 4 is a vertical cross-sectional view showing a work process after the work shown in FIG. 3, with some parts omitted. FIG. 5 is a vertical sectional view showing a work process after the work shown in FIG. 4, with some parts omitted. FIG. 6 is a vertical sectional view showing a work process after the work shown in FIG. 5, with some parts omitted. FIG. 7 is a vertical cross-sectional view showing a work process after the work shown in FIG. 6, with some parts omitted. FIG. 8 is a vertical cross-sectional view showing a work process after the work shown in FIG. 7, with some parts omitted. FIG. 11 is a partially omitted vertical cross-sectional view showing the state after the pipeline construction work is completed.

Below, a pipeline construction method according to an embodiment of the present invention will be described with reference to Figures 1 to 9. As shown in Figure 9, the pipeline construction method according to this embodiment is a pipeline construction method in which a continuous pipeline 40 is formed in a watertight manner along the longitudinal direction of the existing pipe 30 to be constructed inside the existing pipe 30 to be constructed, which is buried underground between the starting shaft 10 and the arrival shaft 20. The arrow S in Figure 1 indicates the flow direction of a fluid (such as sewage) flowing inside the existing pipe 30 to be constructed, but construction is possible even if the flow direction is opposite to that of the arrow S.

As shown in FIG. 9, the tubular body 1 used to form a continuous pipeline 40 inside the existing pipe 30 to be worked on has a length 1L smaller than the inner diameter 11d of the pipe mounting wall 11 of the starting shaft 10, and an outer diameter 1D smaller than the inner diameter 30d of the existing pipe 30 to be worked on, as shown in FIG. 3. A male thread 1m is formed on the outer periphery of the base end opening 1b of the tubular body 1, and a female thread 1f is formed on the inner periphery of the tip opening 1a. The female thread 1f and the male thread 1m are shaped so that they can be screwed together. The tubular body 1 is not limited to, but is preferably, for example, a rigid polyvinyl chloride pipe (straight pipe with a spiral joint) for sewer jacking construction. The first tubular body 1-1, second tubular body 1-2, and third tubular body 1-3 described later have the same size and shape as the tubular body 1 shown in FIG. 3.

When starting the pipeline construction method, as shown in FIG. 1, after chipping and removing the inverts (not shown) of the starting shaft 10 and the arrival shaft 20 (see FIG. 9), the inside of the existing pipe 30 to be constructed is cleaned, and the fixing member 2 is attached to the starting side opening 30a of the existing pipe 30 to be constructed, which opens into the starting shaft 10. The fixing member 2 has a cylindrical portion 2a and a flange portion 2b formed at one end of the cylindrical portion 2a, and the outer diameter of the cylindrical portion 2a is equal to or smaller than the inner diameter 30d of the existing pipe 30 to be constructed, and can be inserted into the existing pipe 30 to be constructed from the starting side opening 30a, and the outer diameter of the flange portion 2b is larger than the inner diameter 30d of the existing pipe 30 to be constructed. When the cylindrical portion 2a of the fixing member 2 is inserted into the existing pipe 30 to be constructed from the starting side opening 30a, the flange portion 2b is engaged with the periphery of the starting side opening 30a. Furthermore, the inner diameter 2d of the cylindrical portion 2a of the fixing member 2 is larger than the outer diameter 1D of the tubular body 1.

Next, a hydraulic jack 3, which is a pressing means, is placed inside the existing pipe 31 that opens 180 degrees opposite the starting side opening 30a. The hydraulic jack 3 has a pressing part 3a that moves forward and backward relative to the starting side opening 30a, and is placed inside the existing pipe 31 while connected to a reaction means 5 that engages with the existing pipe opening 31a. The pressing part 3a of the hydraulic jack 3 is disk-shaped, and moves forward and backward relative to the starting side opening 30a by a piston rod 3b that expands and contracts with the oil supplied from a compressor 4 placed on the ground part of the starting side shaft 10 via oil supply pipes 4a and 4b.

The reaction means 5 comprises a fan-shaped locking member 5a that is locked to the periphery of the existing pipe opening 31a, and a bottomed cylindrical holding member 5b that extends from the locking member 5a toward the inside of the existing pipe 31 and holds the hydraulic jack 3 at a fixed position (coaxial with the axis of the existing pipe 31) in the existing pipe 31. A gutter-shaped connecting member 5c that is inscribed on the inner circumferential surface of the existing pipe 31 is integrally formed between the locking member 5a and the holding member 5b. The inner diameter of the connecting member 5c is larger than the outer diameter of the pressing portion 3a (see FIG. 2).

The longitudinal size of the reaction means 5 is larger than the inner diameter of the starting shaft 10, but the outer diameter 5d of the retaining member 5b is approximately half the inner diameter 31d of the existing pipe 31, so the reaction means 5 can be inserted into the existing pipe 31 by transporting it in an inclined state into the starting shaft 10.

After the fixing member 2 and the reaction means 5 have been placed, the support member 6 and the stand 7 are placed at the bottom 10b of the starting shaft 10. The stand 7 is a member for holding the tubular body 1 in a horizontal position when it is lowered from the ground part of the starting shaft 10 in the subsequent process. Note that the order in which the fixing member 2, reaction means 5, and stand 7 are placed is not limited to the order described above, and can be changed depending on the situation at the site.

Next, as shown in FIG. 3, the first tubular body 1-1 is carried from the ground into the starting shaft 10, and placed on the platform 7 with the tip opening 1a and base opening 1b of the first tubular body 1-1 facing the starting opening 30a and existing pipe opening 31a, respectively (first tubular body carrying process), and the pressing portion 3a of the hydraulic jack 3 is brought into contact with the base opening 1b of the first tubular body 1-1.

After that, as shown in FIG. 4, the piston rod 3b of the hydraulic jack 3 is advanced to advance the pressing portion 3a toward the starting opening 30a, pressing the base end opening 1b of the first tubular body 1-1, and inserting the first tubular body 1-1 from the starting opening 30a into the existing pipe 30 to be worked on, with its tip opening 1a facing the arrival shaft 20 (see FIG. 9) (first tubular body insertion process). At this time, the reaction force received by the pressing portion 3a from the first tubular body 1-1 by advancing the piston rod 3b of the hydraulic jack 3 is supported by the reaction means 5.

When the base end opening 1b of the first tubular body 1-1 has moved to the starting side opening 30a, as shown in FIG. 5, the piston rod 3b of the hydraulic jack 3 is retracted to move the pressing part 3a back from the starting side opening 30a. After this, as shown in FIG. 6, the second tubular body 1-2 is carried into the starting side shaft 10, and placed on the stand 7 with the tip end opening 1-2a and base end opening 1-2b of the second tubular body 1-2 facing the starting side opening 30a and existing pipe opening 31a, respectively (second tubular body carrying process).

Next, the female threaded portion 1-2f of the tip opening 1-2a of the second tubular body 1-2 is screwed into the male threaded portion 1-1m of the base opening 1-1b of the first tubular body 1-1 to connect the tip opening 1-2a of the second tubular body 1-2 to the base opening 1-1b of the first tubular body 1-1 (second tubular body connecting process).

When the work of connecting the second tubular body 1-2 to the first tubular body 1-1 is completed, as shown in Figures 7 and 8, the pressing portion 3a of the hydraulic jack 3 is advanced toward the starting side opening 30a to press the base end opening 1b of the second tubular body 1-2, thereby moving the integrated first tubular body 1-1 and second tubular body 1-2 along the existing pipe 30 to be worked on toward the arrival side shaft 20 (see Figure 9) (connecting tubular body moving process).

After the above-mentioned connecting tubular body moving process, when the base end opening 1-2b of the second tubular body 1-2 moves to the starting side opening 30a, the pressing part 3a of the hydraulic jack 3 is retreated from the starting side opening 30a, and then the same three processes as the second tubular body carrying process shown in FIG. 6, the second tubular body connecting process shown in FIG. 7 and FIG. 8, and the connecting tubular body moving process are repeated in sequence, and the tip opening 1-1a of the first tubular body 1-1 reaches the arrival side opening 30b (see FIG. 9) of the existing pipe 30 to be worked on, as shown in FIG. 9. After this, the fixing member 2, hydraulic jack 3, reaction means 5, compressor 4, and oil supply pipes 4a, 4b shown in FIG. 1 are removed, and a watertight continuous pipe line 40 is formed inside the existing pipe 30 to be worked on along the longitudinal direction of the existing pipe 30 to be worked on, as shown in FIG. 9.

As described above, according to the pipeline construction method of this embodiment, a pipeline 40 can be formed in an existing pipe 30 to be constructed using general-purpose civil engineering construction materials and civil engineering construction machines, such as a tubular body 1, a fixing member 2, a hydraulic jack 3, a reaction means 5, a compressor 4, and fuel supply pipes 4a, 4b. In addition, since the pipeline construction method of this embodiment does not require work that requires special skills, construction is easy and the construction period can be shortened.

As shown in Figures 7 and 8, in the connected tubular body moving process in which a connected tubular body made up of multiple connected tubular bodies 1-1, 1-2, ... is moved along the existing pipe 30 to be worked on, the pressing force of the pressing part 3a of the hydraulic jack 3 is applied to each of the tubular bodies 1-1, 1-2, ... as a compressive force in the longitudinal direction, so that damage to the tubular bodies 1-1, 1-2, ... can be prevented even if the length of the connected tubular body becomes relatively long.

The pipeline construction method described with reference to Figures 1 to 9 is merely an example of the pipeline construction method according to the present invention, and the pipeline construction method according to the present invention is not limited to the pipeline construction method described above.

The pipe construction method according to the present invention can be widely used in industrial fields such as civil engineering and construction, for example as a method for forming pipes inside existing pipes such as sewer pipes, drainage pipes, and storm water pipes that are buried underground.

1 Tubular body 1-1 First tubular body 1-2 Second tubular body 1a, 1-1a, 1-2a Tip opening 1b, 1-1b, 1-2b Base opening 1d, 1D, 5d Outer diameter 1f, 1-2f Female threaded portion 1L Length 1m, 1-1m Male threaded portion 2 Fixing member 2a Cylindrical portion 2b Flange portion 2d, 10d, 11d, 30d, 31d Inner diameter 3 Hydraulic jack 3a Pressing portion 3b Piston rod 4 Compressor 4a, 4b Oil supply pipe 5 Reaction means 5a Locking member 5b Holding member 5c Connecting member 6 Support member 7 Frame 10 Starting side shaft 10b Bottom 11 Pipe mounting wall 11d, 30d, 31d Inner diameter 20 Arrival shaft 30 Existing pipe to be constructed 30a Starting opening 30b Arrival opening 31 Existing pipe 31a Existing pipe opening 40 Pipe line

Claims (5)

A pipe construction method for forming a pipe line along an existing pipe to be constructed , the existing pipe being buried underground between a starting shaft and a reaching shaft, the starting shaft having a starting opening, the existing pipe having an opening 180 degrees opposite to the starting opening in the starting shaft , from inside the starting shaft to the reaching shaft, the method comprising:
a step of disposing a pressing means having a pressing part capable of advancing and retreating with respect to the starting side opening inside the existing pipe , the pressing means being connected to a reaction means which engages with the existing pipe opening and holds the pressing means at a fixed position inside the existing pipe by a bottomed tubular holding member which extends from a locking member which is locked to the periphery of the existing pipe opening toward the inside of the existing pipe;
a first tubular body carrying process for carrying a first tubular body, the length of which is smaller than the inner diameter of the starting shaft and the outer diameter of which is smaller than the inner diameter of the existing pipe, into the starting shaft, and positioning the tip opening and base opening of the first tubular body toward the starting side opening and the existing pipe opening, respectively;
a first tubular body inserting process in which a pressing portion of the pressing means is advanced toward the starting side opening to press the base end opening of the first tubular body, and the first tubular body is inserted from the starting side opening into the existing pipe to be constructed with its tip opening side facing the arrival side shaft;
a second tubular body carrying process in which, when the base end opening of the first tubular body moves to the starting side opening, the pressing portion of the pressing means is retracted from the starting side opening, and then a second tubular body having a length smaller than the inner diameter of the starting side shaft and an outer diameter smaller than the inner diameter of the existing pipe is carried into the starting side shaft, and the tip end opening and base end opening of the second tubular body are brought into a state facing the starting side opening and the existing pipe opening, respectively;
a second tubular body connecting step of connecting a distal end opening of the second tubular body to a proximal end opening of the first tubular body;
A pipeline construction method comprising: a connecting tubular body moving process, in which, after completion of the second tubular body connecting process, a pressing portion of the pressing means is advanced toward the starting side opening to press the base end opening of the second tubular body, and the first tubular body and the second tubular body are moved along the existing pipe to be constructed toward the arrival side shaft. The pipe construction method according to claim 1, in which, after the base end opening of the second tubular body has moved to the starting side opening through the connecting tubular body moving step, the pressing part of the pressing means is retracted from the starting side opening, and then three steps similar to the second tubular body carrying-in step, the second tubular body connecting step, and the connecting tubular body moving step are repeated in sequence to bring the tip opening of the first tubular body to the destination side opening of the existing pipe to be constructed. The pipe construction method according to claim 1 or 2, wherein the reaction means comprises a locking member that is locked to the periphery of the opening of the existing pipe, and a holding member that extends from the locking member toward the inside of the existing pipe and holds the pressing means at a fixed position within the existing pipe. The pipe construction method according to any one of claims 1 to 3, wherein the first tubular body and the second tubular body have a female thread portion on the outer periphery of the tip opening (or the base opening), and a male thread portion on the inner periphery of the base opening (or the tip opening) that can be screwed into the female thread portion. The pipe construction method according to any one of claims 1 to 4, wherein the pressing means is a hydraulic jack having a pressing part that moves forward and backward by oil supplied from a compressor placed on the ground part of the starting shaft via an oil supply pipe.

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