JP2003343763A - Method of installing underground pipe - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method of installing an underground pipe without joint, excellent in the corrosion resistance, requiring a short construction period and low expenses, and without having foreign matter between the pipe inner surface and the lining. <P>SOLUTION: A starting shaft 21 and an arriving shaft 23 are structured, and an excavator 5 is advanced from the starting shaft 21 toward the arriving shaft 23 while propulsion pipes 7 consisting of a plurality of steel pipes are sequentially connected to the rear part of the excavator 5. Then, the starting shaft 21 and the arriving shaft 23 are made to communicate with each other with the plurality of continuous propulsion pipes 7 by letting the excavator 5 arrive at the arriving shaft 23. A thermoplastic resin pipe for lining, crushed flat in the U-shape, with the outer diameter almost the same as the inner diameter of the propulsion pipe 7, is used in the method. The resin pipe for lining is closely brought into contact with the inner wall surface of the propulsion pipe 7 by feeding and inserting the resin pipe for lining in the heat-softened state into the propulsion pipe 7 and forcing a heating fluid such as steam into the resin pipe for lining. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a buried pipe laying method for obtaining a seamless buried pipe on an inner wall surface.

[0002]

2. Description of the Related Art In buried pipes such as sewer pipes, corrosion of the inner wall surface,
Water leakage may occur due to misalignment of the receiving part.

Such existing buried pipes (sewage pipes) may be subjected to lining work for covering the inner wall surface. This lining construction is carried out, for example, in JP-A-11-18.
As disclosed in Japanese Patent No. 8794, a drum having a profile wound around an upstream manhole is arranged, a pipe manufacturing machine is incorporated inside an existing buried pipe, and the entire pipe manufacturing machine is revolved in the circumferential direction of the existing buried pipe. While moving the pipe, the profile is spirally wound around the inner wall surface by advancing in the axial direction of the existing buried pipe, and the lining pipe is manufactured from the upstream side to the downstream side of the existing buried pipe.

[0004]

However, the method of making a lining pipe by spirally winding a profile around the above-mentioned existing buried pipe is a repairing method for the existing buried pipe. After the completion, since the lining pipe is manufactured separately, a lot of work overlaps with the burying work of the burying pipe, resulting in a longer total construction period.
Expenses have also increased. Further, in such a repairing method, there is a problem that foreign matter remains between the inner surface of the pipe and the lining due to the lining construction after the buried pipe is used, and the corrosion resistance of the buried pipe is impaired. There is also a method of laying a buried pipe for connecting steel pipes coated with a resin in advance, but a seam of the coating resin is present at the joint between the steel pipes, which is a factor that reduces the anticorrosion property and the water blocking property.

The present invention has been made in view of the above circumstances, and it is possible to obtain a buried pipe which is seamless and has excellent corrosion resistance in a short construction period and at a low cost, and also between the inner surface of the pipe and the lining. An object of the present invention is to provide a method for laying a buried pipe in which no foreign matter is present.

[0006]

[Means for Solving the Problems] Next, means for solving the above problems will be described with reference to the drawings corresponding to the embodiments. According to the method of laying a buried pipe according to claim 1 of the present invention, a starting shaft 21 and a reaching shaft 23 are constructed, and the propulsion pipe 7 made of a plurality of steel pipes is sequentially connected to the rear portion of the excavator 5 while the excavator 5 is being connected. From the starting shaft 21 to the reaching shaft 2
3 by making the excavator 5 reach the reaching shaft 23, the starting shaft 21 and the reaching shaft 23 are communicated with each other by the plurality of continuous propulsion pipes 7, A thermoplastic lining resin pipe 31 having an outer diameter substantially the same as the inner diameter and flattened into a substantially U shape is used, and the lining resin pipe 31 is heated and softened to be fed out, and the propulsion pipe 7 Insert it inside,
A heating fluid is pressure-fed into the lining resin pipe 31 to bring the lining resin pipe 31 into close contact with the inner wall surface of the propulsion pipe 7.

In this method of laying the buried pipe, the inner wall surface of the propulsion pipe 7 is lined by the lining resin pipe 31 in a series of steps of burying the propulsion pipe 7, and the construction period is short and the cost is low. It is possible to lay a buried pipe 25 that is seamless and has excellent corrosion resistance on the inner surface. Further, since the lining resin pipe 31 is lined at the same time as the construction of the propulsion pipe 7, unlike the case where the lining construction is performed after using the propulsion pipe 7 as the buried pipe 25, that is, unlike the repair execution, the propulsion pipe 7 Since no foreign matter is present between the inner surface of the embedded pipe 25 and the lining resin pipe 31, the corrosion resistance of the buried pipe 25 is further enhanced.

A method for laying a buried pipe according to a second aspect is the method for laying a buried pipe according to the first aspect, wherein the propulsion pipe 7 has a substantially U-shaped flat crushed thermoplastic lining. The resin pipe 31 is extended, and a long and small-diameter cable protection pipe 41 is extended and inserted, and a heating fluid is pumped into the lining resin pipe 31 to move the lining resin pipe 31 into the propulsion pipe 7. The cable protection pipe 41 is closely attached to the wall surface, and the cable protection pipe 41 is interposed between the propulsion pipe 7 and the lining resin pipe 31.

In this buried pipe laying method, the cable protection pipe 41 is laid at the same time as the lining of the new buried pipe 25, and the construction can be carried out in a short construction period and at a low cost. The cable protection pipe 41 is laid between the inner wall surface of the propulsion pipe 7 and the lining resin pipe 31 with a structure excellent in corrosion resistance.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Preferred embodiments of a method for laying a buried pipe according to the present invention will be described in detail below with reference to the drawings. FIG. 1 is a vertical cross-sectional view showing a state in which the excavator is set in the laying method according to the present invention, FIG. 2 is a vertical cross-sectional view showing an initial excavator state in the digging machine according to the present invention, and FIG. 3 is a laying method according to the present invention. FIG. 4 is a vertical cross-sectional view showing the buried pipe propelling state, FIG. 4 is a vertical cross-sectional view showing the reaching state of the excavator of the laying method according to the present invention,
FIG. 5 is a vertical cross-sectional view showing a state where the lining resin pipe is inserted in the laying method according to the present invention, FIG. 6 is an explanatory view of the lining resin pipe winding step of the laying method according to the present invention, and FIG. 7 is related to the present invention. It is explanatory drawing of the lining resin pipe lining process of a laying method.

In the buried pipe laying method according to the present embodiment, the buried pipe is buried by the propulsion method. For the propulsion method, the excavation device 1 shown in FIG. 1 is used. The excavation device 1 is
The excavator 5 via the propulsion stand 3, the excavator 5, and the propulsion pipe 7.
A propulsion jack 9 that presses, a hydraulic supply device 13 that is installed on the ground and connected to the propulsion jack 9 via a hydraulic hose 11, and an excavator 5 and a propulsion jack 9 that are connected to the excavation device 1 via an operation line 15. Control device 17 for controlling the operation of the
And are the main components. Further, a mud feeding pipe and a mud feeding pipe (not shown) are connected to the excavation device 1.

The propulsion pipe 7 is made of a steel pipe produced in advance in a factory, plays a role of transmitting the pressing force of the propulsion jack 9 to the excavator 5, and is used as a buried pipe after the completion of construction.

The excavator 5 has a special cutter bit at its tip, and revolves while rotating the special cutter bit for crushing. Further, the excavator 5 has a crusher cone inside the tip of the tip, and excavates while performing secondary crushing by the crusher cone.

Next, the procedure of the laying method will be described. First,
Prior to the buried pipe excavation method, a starting shaft 21 and a reaching shaft 23 shown in FIG. 1 are constructed in the ground. Starting shaft 21
After the survey, the propulsion stand 3 and the propulsion jack 9 are installed inside. Then, the survey is performed again to confirm the accuracy of the propulsion direction, height, and gradient.

Next, the excavator 5 is attached to the propulsion stand 3 and the wiring and piping are connected. Mirror cut will be performed after the completion of the tunnel stop. Next, as shown in FIG. 2, the excavator 5 is operated, and the cutter bit at the tip of the excavator is used for crushing, and at the same time, the crusher cone inside the blade mouth is used for secondary crushing to proceed with digging.

The excavated earth and sand is transported to the outside of the shaft by the fluid whose pressure is adjusted by the feed / drainage pump, and is forcibly separated by a mat screen (not shown). During excavation, the target installed inside the excavator 5 is continuously monitored by a monitor on the ground for the spot irradiated by the laser transit 24 from inside the starting shaft 21, and if there is displacement, the controller 17 corrects the direction. .

After the excavator 5 has drilled the rock mass, the propulsion pipe 7 made of a steel pipe is welded and attached, and the wiring pipes (operation line, mud feeding pipe / drainage pipe) are connected, and the excavation is resumed. That is, as shown in FIG. 3, while sequentially connecting a plurality of propulsion pipes 7 to the rear portion of the excavator 5, the excavator 5 is moved from the starting shaft 21 to the reaching shaft 2
Dig towards 3. The above operation is repeated. In addition, the connection between the propulsion pipes 7 may be not only the above-mentioned welding but also a connection connection through a water stop ring.

As shown in FIG. 4, the excavator 5 is reached by the reaching shaft 2
When it reaches 3, the excavator 5 is taken into the reaching shaft 23. Next, the excavator 5 divided into a plurality of pieces is carried out of the reaching shaft 23. As a result, the starting shaft 21 and the reaching shaft 23
Are communicated with each other by a buried pipe 25 which is the propulsion pipe 7.

Then, as shown in FIG. 5, a thermoplastic lining resin pipe 31 having an outer diameter substantially the same as the inner diameter of the propulsion pipe 7 (embedded pipe 25) is brought into a softened state by heating to embed the embedded pipe 25.
Insert it inside. The lining resin pipe 31 is a pipe body made of a thermoplastic resin, and as the material thereof, for example, polyvinyl chloride resin, polypropylene, polyethylene, or alkrin, ethylene vinyl acetate, ethylene butyl acrylate, nitrile butyl rubber or the like can be used. it can. The outer diameter of the lining resin pipe 31 is equal to that of the buried pipe 2.
The inner diameter of 5 is substantially the same.

The lining resin pipe 31 is shown in FIGS. 6 (b) to 6 (c) in advance in a softened state immediately after molding at a high temperature of about 60 ° C. and a substantially circular cross section shown in FIG. 6 (a). A part of the outer periphery parallel to the tube axis direction is flatly deformed into a U shape and crushed into a roll shape, which is wound around the drum 33 shown in FIG. 6D. The rolled lining resin tube 31 is naturally cooled to room temperature and hardened. The lining resin pipe 31 is stored in a roll state wound around the drum 33, and is conveyed and supplied to the installation site.

The lining of the resin tube 31 for lining is
The heating is performed again at a high temperature, for example, about 90 ° C., and the softened state is fed to the buried pipe 25. A dedicated restoring device (not shown) is used to feed the lining resin pipe 31 in the softened state. This restoration device, for example,
A heating chamber capable of heating the cured roll-shaped lining resin pipe 31, a feeding reel portion capable of feeding the tip of the lining resin pipe 31 while rotating the drum 33, and a high temperature inside the lining resin pipe 31. It is provided with a high temperature fluid pumping unit and the like capable of pumping fluid.

In the lining with the lining resin pipe 31, the lining resin pipe 31 is heated to a softened state in the heating chamber of the restoration device, and is fed into the embedded pipe 25 slightly longer than the entire length of the embedded pipe 25. As this heating fluid,
Air, steam, etc. can be used suitably.

When the lining resin pipe 31 is inserted into the buried pipe 25, the lining resin pipe 31 is supported between the starting shaft 21 and the reaching shaft 23 with a predetermined tension. Next, the high temperature fluid pumping unit of the restoring device pumps the high temperature fluid from the starting shaft 21 side of the lining resin pipe 31. As the high temperature fluid in this case, a mixed fluid of air and water such as steam at 90 ° C. is used.

When the high temperature fluid is supplied to the inside, FIG.
The lining resin pipe 31 shown in (a) first expands from a state in which it is deformed into a substantially U shape to a state in which the crushed inner hollow portion expands in the radial direction, and FIGS. As shown in, the cross-sectional shape is close to a circular shape. When the lining resin pipe 31 has been restored to a substantially original cross-sectional shape, the terminal side of the lining resin pipe 31 is squeezed and the high temperature and high pressure fluid is kept for a predetermined time. As a result, the lining resin pipe 31 is completely restored to its original shape.
As shown in (d), the outer peripheral surface is brought into close contact with the inner wall surface of the buried pipe 25.

According to this buried pipe laying method, the propulsion pipe 7
The inner wall surface of the propulsion pipe 7 is lined by the lining resin pipe 31 in the burying process and the lining process, and a new burying pipe 25 with excellent corrosion resistance is newly laid on the inner surface with a short construction period and at low cost. It will be possible. Moreover, since the lining resin pipe 31 is lined at the same time as the construction of the propulsion pipe 7, unlike the case where the lining is constructed after the propulsion pipe 7 is used as the buried pipe 25, the inner surface of the propulsion pipe 7 and the lining resin pipe are different from each other. Since no foreign matter is present between the buried pipe 25 and 31, the corrosion resistance of the buried pipe 25 is further enhanced. Then, the buried pipe 25 having improved corrosion resistance can be realized by the propulsion pipe 7 made of an inexpensive steel pipe.

Next, a modification of the method for laying a buried pipe according to the present invention will be described. FIG. 8: is explanatory drawing of the resin pipe winding process for linings provided with the cable protection pipe of the modification which concerns on this invention,
FIG. 9 is an explanatory diagram of a lining resin pipe lining process of a modified example according to the present invention.

In this modification, the lining resin pipe 31 and the cable protection pipe 41 are inserted into the propulsion pipe 7.
The cable protection tube 41 is made of a small-diameter tube body, has a high crushing strength, and is a flexible resin tube or a bellows-shaped protection tube (so-called corrugated tube or the like). A cable such as an optical fiber cable or an electric wire is inserted into the cable protection tube 41.

In the softened state, the lining resin pipe 31 is changed from the state shown in FIG.
A part of the outer circumference parallel to the tube axis direction as shown in (b) is deformed into a concave shape and crushed. Crushed lining resin pipe 31
A cable protection tube 41, which is also formed in a long shape, is placed along the groove in the substantially U shape.

As shown in FIG. 8 (c), the lining resin pipe 31 is flattened into a substantially U shape so as to be crushed and enclose the cable protection pipe 41 in the left-right direction. The lining resin pipe 31 including the cable protection pipe 41 in this manner is wound around the drum 33 in a roll shape as shown in FIG. 8D.

Then, the lining resin pipe 31 including the cable protection pipe 41 is heated to a high temperature again in the same manner as in the above-mentioned method of laying a buried pipe, and is softened to be fed to the buried pipe 25. When the high temperature fluid is supplied to the inside, FIG.
First, the lining resin pipe 31 shown in FIG. 9 expands from a state in which it is deformed into a substantially U shape to a state in which the crushed inner hollow portion expands in the radial direction, and as shown in FIG. The protection tube 41 is placed in the recess on the upper surface.

When the hot fluid is further fed from the hot fluid pumping portion from this state, as shown in FIG. 9C, the lining resin pipe 31 is further restored in the radial direction, and the cross-sectional shape is close to a circular shape. Become. The cable protection pipe 41 is placed on the upper portion of the lining resin pipe 31 in a state of being sunk by its own weight, and is lifted further upward as it is.

When the lining resin pipe 31 has been restored to the substantially original cross-sectional shape, the terminal side of the lining resin pipe 31 is squeezed and the high temperature and high pressure fluid is kept for a predetermined time. Thereby, the resin pipe 31 for lining is
The original shape is completely restored, and the outer peripheral surface is brought into close contact with the inner wall surface of the buried pipe 25. As a result, as shown in FIG. 9D, the cable protection pipe 41 can be sandwiched between the embedded pipe 25 and the lining resin pipe 31.

According to this modification, the cable protection pipe 41 is laid simultaneously with the lining of the new buried pipe 25, so that the cable protection pipe 41 can be constructed in a short construction period and at low cost. And the cable protection tube 4
1 is installed between the inner wall surface of the buried pipe 25 and the lining resin pipe 31 with a structure excellent in corrosion resistance.

[0034]

As described above, according to the method for laying the buried pipe according to the first aspect of the present invention, the starting shaft and the starting shaft are connected while the propulsion pipes made of a plurality of steel pipes are sequentially connected to the rear part of the machine. The reaching shaft is connected with the propulsion pipe, the thermoplastic lining resin pipe is heated and softened and inserted into the propulsion pipe, and the heating fluid is pumped into the lining resin pipe to propel the lining resin pipe. The inner wall surface of the propulsion pipe can be lined in a series of steps by embedding the propulsion pipe in a series of steps, and it is possible to obtain a buried pipe with excellent corrosion resistance that is seamless on the inner surface with a short construction period and low cost. be able to. Also, since the lining is done at the same time as the construction of the propulsion pipe,
Unlike the case where the lining work is performed after using the propulsion pipe as the buried pipe, no foreign matter is present between the inner surface of the propulsion pipe and the lining, and the corrosion resistance of the buried pipe can be further enhanced.

According to the buried pipe laying method of the second aspect, the lining resin pipe and the cable protection pipe are inserted into the propulsion pipe, and the heating fluid is pressure-fed into the lining resin pipe for lining. By laying the resin pipe closely to the inner wall surface of the propulsion pipe, the cable protection pipe is sandwiched between the propulsion pipe and the resin pipe for lining, so the cable protection pipe is laid at the same time as the lining construction of the new buried pipe. be able to. As a result, the cable protection tube can be laid with a structure having excellent corrosion resistance in a short construction period and at low cost.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing a state where a machine is set in a laying method according to the present invention.

FIG. 2 is a vertical cross-sectional view showing an initial excavation state of the excavator of the laying method according to the present invention.

FIG. 3 is a vertical cross-sectional view showing a buried pipe propelling state in the laying method according to the present invention.

FIG. 4 is a vertical cross-sectional view showing a state in which the machine reaches the shaft of the laying method according to the present invention.

FIG. 5 is a vertical cross-sectional view showing a state in which a lining resin pipe is inserted in a laying method according to the present invention.

FIG. 6 is an explanatory view of a lining resin pipe winding step of the laying method according to the present invention.

FIG. 7 is an explanatory diagram of a lining resin pipe lining step of the laying method according to the present invention.

FIG. 8 is an explanatory diagram of a lining resin pipe winding step including a cable protection pipe of a modified example according to the present invention.

FIG. 9 is an explanatory diagram of a lining resin pipe lining process of a modified example according to the present invention.

[Explanation of symbols]

5 ... Excavator 7 ... Propulsion tube 21 ... Starting shaft 23 ... Arrival shaft 25 ... Buried pipe 31 ... Resin pipe for lining 41 ... Cable protection tube

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Yasutaka Matsuo             1-18-1 Kyobashi, Chuo-ku, Tokyo             Within Kasei Co., Ltd. F-term (reference) 2D054 AC18                 4F211 AD05 AD12 AG08 AH43 SC03                       SD04 SH06 SH18 SJ01 SP12                       SP15

Claims (2)

[Claims] 1. A starting shaft and a reaching shaft are constructed, and the excavator is driven toward the reaching shaft from the starting shaft while sequentially connecting a propulsion pipe made of a plurality of steel pipes to a rear portion of the excavating machine. When the excavator reaches the reaching shaft, the starting shaft and the reaching shaft are communicated with each other by the plurality of continuous propulsion pipes, which have an outer diameter substantially the same as the inner diameter of the propulsion pipe and are substantially U.
Using a thermoplastic lining resin tube flatly crushed in a letter shape, the lining resin tube is fed out in a heat-softened state, inserted into the propulsion tube, and a heating fluid is introduced into the lining resin tube. A method for laying a buried pipe, characterized in that the resin pipe for lining is pressure-fed to bring the lining resin pipe into close contact with the inner wall surface of the propulsion pipe. 2. The method for laying a buried pipe according to claim 1, wherein the thermoplastic lining resin pipe flatly crushed in the U shape is fed into the propulsion pipe, and a long and small diameter cable is protected. The pipe is extended and inserted, and the heating fluid is pressure-fed to the inside of the lining resin pipe to bring the lining resin pipe into close contact with the inner wall surface of the propulsion pipe,
A method for laying a buried pipe, characterized in that the cable protection pipe is sandwiched between the propulsion pipe and the lining resin pipe.