JPH07102883A - Buried pipe for propulsion construction method - Google Patents

Abstract

PURPOSE:To lay a pipe to be buried in an adit with small resistance, and to suppress the generation of a damage even when the pipe is brought into a bending condition after the laying. CONSTITUTION:A cover pipe 14 is fitted so as to expose the ends of a main pipe 11, and one side of the main pipe 11 exposed from the cover pipe 14 is covered with a cylindrical packing 12. The base end of a collar pipe 13 is fitted to the packing 12, and a faucet 17 is composed by the front end extended from the main pipe 11. The length of the faucet 17 in the axial direction is shorter than the length of the other side exposed end in the main pipe 11 in the axial direction. The outer diameter of the collar pipe 13 is equal to the outer diameter of the cover pipe 14. On the inner peripheral surface at the front end made into the faucet 17 of the collar pipe 13, a cylindrical seal member 19 is installed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a buried pipe for a propulsion method in which a horizontal shaft is formed in the ground and is sequentially propelled in the horizontal shaft, and particularly to submerge the ground such as soft ground. The buried pipe for the propulsion method that is not likely to be damaged even if it is laid in the underground.

[0002]

2. Description of the Related Art A propulsion method is known as a method for laying buried pipes, such as sewer pipes, water pipes, and power cable protection pipes, which are laid underground.

In this propulsion method, a tip conduit having an excavation cutter at its tip is inserted horizontally into the ground from the inside of a shaft formed in the ground, and the excavation cutter slightly excites the buried pipe. The underground pipe is propelled into the horizontal shaft while forming a horizontal shaft. The buried pipe has an insertion port at the tip and a receiving port at the rear end, respectively, and when the buried pipe is propelled inside the shaft, the receiving port at the rear end,
The insertion opening provided at the tip of the subsequent buried pipe is inserted. Then, by pushing the subsequent buried pipe into the ground, the preceding buried pipe is propelled into the side pit together with the succeeding buried pipe. In the same manner, the buried pipe is laid all over the underground shaft by similarly connecting the subsequent buried pipe to the buried pipe propelled into the ground and propelling it into the ground.

In the buried pipe used for such a propulsion method, if the rear end is provided with a receiving opening having a diameter larger than that of the pipe main body, a large resistance is exerted on the receiving opening when propelled in the horizontal shaft. Join. Therefore, a buried pipe in which the outer diameter of the receiving port is not larger than that of the pipe body is disclosed in, for example, Japanese Utility Model Publication No. 4-10319. In the buried pipe disclosed in this publication, the outer peripheral surface at one end is deleted to provide a step, and a collar made of reinforced plastic is integrally bonded to fill the step to form a receiving port.
A ring-shaped rubber for water stopping is installed between the collar and the outer peripheral surface of the pipe end, and a cylindrical rubber ring for water stopping is also provided on the inner peripheral surface of the collar that serves as a receiving port. ing.

[0005]

In the buried pipe having such a structure, a part of the pipe main body is cut so that the outer peripheral surface of the fitted collar does not form a step with the outer peripheral surface of the pipe main body. It is in a flat state like this. In this way, the end of the pipe body where the collar is fitted must be machined,
There is a problem that manufacture is not easy. Moreover, since the end of the pipe body is cut, the rigidity of the end of the pipe body may decrease.

Since a ring-shaped rubber ring for waterproofing having a circular cross section is interposed between the outer peripheral surface of one end of the pipe main body and the inner peripheral surface of the collar, the collar is formed in the pipe main body. It has some flexibility with respect to the part and is in a state in which it can be tilted. However, since the collar is integrated with the pipe body and the rubber ring for waterproofing has a ring shape with a circular cross section, sufficient flexibility cannot be obtained. With buried pipes laid in the ground such as soft ground, the buried pipe may be curved due to ground subsidence, but in this case, the collar provided at the end of the buried pipe is bent. It becomes a state. If the collar bends, the collar itself that is integrated with the pipe body may be damaged, and the end portion of the pipe body where the collar is fitted has the outer peripheral surface cut to provide sufficient rigidity. Since it is not present, there is a risk that the end portion will break.

The present invention solves such a conventional problem, and an object of the present invention is to prevent damage even when it is laid inside a shaft, even if it becomes curved due to ground subsidence or the like. It is to provide a buried pipe for a propulsion method that can be suppressed.

[0008]

A buried pipe for a propulsion method according to the present invention is a buried pipe for a propulsion method that is sequentially propelled and laid in a shaft formed in the ground, and has a constant inner diameter and A main pipe having an outer diameter, a cover pipe fitted to the main pipe so that respective ends of the main pipe are exposed, and one end of the main pipe exposed from the cover pipe. An elastic cylindrical packing fitted so as to cover it, and a proximal end portion thereof are fitted into this packing so that a distal end portion axially extending from the main pipe serves as a receiving end. A collar tube having an axial length shorter than the axial length of the other exposed end of the main pipe, and having an outer diameter equal to the outer diameter of the cover pipe, and a tip serving as a receiving port for the collar pipe. The cylindrical shape with elasticity arranged on the inner peripheral surface Which is characterized by comprising a seal member, the above-described object can be achieved.

[0009]

The buried pipe for the propulsion method according to the present invention is inserted into the horizontal shaft formed in the ground from the insertion side and is propelled. Then, when almost the entire buried pipe is propelled into the ground, the insertion port of another buried pipe that follows is inserted into the receiving port, which is the tip of the collar pipe extending from the main pipe. A seal member arranged between the inner peripheral surface of the color tube and the inner peripheral surface seals the both in a watertight state.

In such a state, propulsive force is applied to the subsequent buried pipe. Since the insertion opening at the end of the main pipe exposed from the cover pipe is longer in the axial direction than the receiving end in the collar pipe, the propulsive force applied to the subsequent buried pipe is the insertion of the main pipe. It is transmitted from the mouth to the end of the main pipe of the preceding buried pipe, and the succeeding buried pipe and the preceding buried pipe are integrally propelled in the underground shaft. At this time, since the cover pipe and the collar pipe fitted to the main pipe of each of the buried pipes have the same outer diameter, the resistance when propelled in each of the buried pipes is small, and each buried pipe is It is smoothly propelled in the side pit.

The collar pipe and the cover pipe fitted to the outer peripheral surface of the main pipe are formed as separate bodies, and have a discontinuous structure in which they are appropriately spaced from each other or in close contact with each other, and are joined together. Even if the buried pipes are bent into a curved state, only the color pipes follow the bending and tilt with respect to the main building. Further, a cylindrical packing is interposed between the collar pipe and the end of the main pipe, and a cylindrical sealing member is interposed between the receiving end of the collar end and the insertion port of the subsequent buried pipe. Therefore, the inclination of the color tube with respect to the main tube is absorbed by the packing and sealing member. If the packing and sealing members have the same material and axial length, the color tube is given twice as much flexibility as if only one were provided.

[0012] The main pipe needs to have strength to withstand the propulsive force transmitted by the propulsion method. For example, a fiber reinforced plastic (FRP) or a fiber reinforced resin in which a resin mortar layer is provided between the FRP layers. A high-strength material made of a material such as mortar (FRPM) is used.

Since the collar tube and the cover tube do not directly transmit the propulsive force between them, the collar tube and the cover tube need not have sufficient strength to withstand the propulsive force in the propulsion method. Therefore, the strength may be determined according to each construction condition. In addition, it is preferable to make the surface smooth so as to reduce the resistance from the inner peripheral surface of the shaft when propelling in the shaft. Therefore, the color tube and the cover tube can be made of a material such as vinyl chloride resin in addition to the above FRP and FRPM.

The dimensional difference between the axial length of the insertion port and the axial length of the receiving port is not particularly limited, but the propulsive force is not directly transmitted to the collar pipe and the cover pipe, and moreover, to the main pipe of the preceding buried pipe. Since a gap is formed between the fitted color pipe and the cover pipe fitted to the main pipe of the subsequent buried pipe, it is said that the surrounding earth and sand enter the gap to protect the main pipe. Hinder the role of the color tube and cover tube,
It is necessary to give consideration so as not to hinder the propulsion method.

The sealing material arranged on the inner peripheral surface of the receiving port is
It may be attached to the inner peripheral surface of the receiving opening, or may be attached to the outer peripheral surface of the insertion opening.

The packing for fixing the collar pipe to the main pipe does not deviate from the main pipe even when the buried pipe is propelled in the shaft, even if the collar pipe is frictional with the inner surface of the shaft. It is necessary to hold the color tube in such a manner that, for example, styrene-butadiene rubber (SBR) is used. Further, the color tube and the main tube and the packing are fixed by an adhesive as needed.

The cover pipe fitted to the main pipe is fixed, for example, with packing between each end of the cover pipe and the main pipe, with a proper gap provided therebetween. . Also for this packing, SBR or the like is used so that the cover tube does not shift from the main tube due to the frictional force of the cover tube with the inner peripheral surface of the shaft. In this case, the gap between the main pipe and the cover pipe may be left as a cavity or may be filled with a backfill material.

Examples of the backfill material include foam material made of polyurethane, resin mortar and sand.

When the backfill material is a foam material made of polyurethane, a hole is made in each packing provided at each end of the cover tube, and a mixture of the two-component urethane foam liquid is injected from one hole. Then, after the remaining air in the gap between the cover pipe and the main pipe is expelled from the other hole, the mixture of the two-component urethane foam liquid may be foamed. In this case, the foam backing material made of polyurethane serves to seal the gap between the main pipe and the cover pipe.

[0020]

Embodiments of the present invention will now be described in detail with reference to the drawings.

FIG. 1 is a vertical sectional view of a buried pipe for a propulsion method according to the present invention.

The buried pipe 1 for the propulsion method of the present invention is an FRP.
Main pipe 11 made of (fiber reinforced plastic)
And a cover tube 14 fitted to the outside of the main tube 11 via a backfill material 16.

The cover pipe 14 is shorter than the main pipe 11, and is fitted so that each end of the main pipe 11 is exposed over the same axial length. Cover tube 14
A packing 15 made of, for example, SBR (styrene-butadiene copolymer rubber) is interposed between the inner peripheral surface of each end of the core 11 and the outer peripheral surface of the main pipe 11, and is closed by each packing 15. Between the outer peripheral surface of the main pipe 11 and the inner peripheral surface of the cover pipe 14, a backfill material 16 made of, for example, a polyurethane foam is filled.

A packing 12 made of, for example, SBR (styrene-butadiene copolymer rubber) is fitted to one end of the main pipe 11 exposed from the cover pipe 14, and the color pipe 13 is fitted to the packing 12. Are fitted. The color tube 13 has an outer diameter equal to the outer diameter of the cover tube 14, and the end surfaces of the color tube 13 and the cover tube 14 facing each other are in contact with each other.
The side portion of the color tube 13 is in a state of extending outward from the end surface of the main tube 11 by a predetermined length X2, and the extended portion is a receiving port 17. On the inner peripheral surface of the portion of the color tube 13 extending from the main tube 11, a seal member 19 having a plurality of inwardly projecting projections provided in the axial direction is mounted. The sealing member 19 is similar to the packing 12 interposed between the collar tube 13 and the main tube 11,
For example, it is configured by SBR.

At the other end of the buried pipe 1 in which the receiving port 17 is formed, the end of the main pipe 11 is exposed from the cover pipe 14 by a predetermined length X1, and the exposed portion is the insertion port 18
It has become. The axial length X1 of the insertion opening 18 is slightly longer than the axial length X2 of the receiving opening 17.

In this way, the color tube 13 and the cover tube 14
Is formed as a separate body, and since the base end of the color tube 13 is supported by the elastic packing 12 that covers the end of the main tube 11, the base end of the color tube 13 is 11 is in a flexible state. Further, since the receiving port 17 is provided with the elastic seal member 19, when the insertion port 18 of another buried pipe 1 is inserted into the receiving port 17, the receiving port 17 can be inserted into the insertion port 18. It is supported in a flexible state.

A method of laying the buried pipe 1 for the propulsion method having such a structure will be described with reference to FIGS. 2 and 3. When laying the buried pipe 1 for the propulsion method, vertical shafts are formed at the respective ends of the pipeline, and as shown in FIG. (Omitted) is installed.

Then, the tip conduit 4 having the excavation cutter 3 provided therein is set in the propulsion mechanism of the propulsion device, and the propulsion mechanism pushes the tip conduit 4 horizontally from the shaft 2 into the ground.

Next, the propulsion mechanism is once retracted, the receiving port of the preceding buried pipe 1 for the propulsion method is set in this propulsion mechanism, and the insertion port 18 of the buried pipe 1 is provided on the rear surface of the front conduit 4. It is fitted to the flange portion 41 formed. Further, the casing 5 is set in the propulsion mechanism, inserted into the buried pipe 1 set in the propulsion mechanism, and brought into a state of being abutted against the leading conduit 4.
Further, the screw 6 is set in the propulsion mechanism, inserted into the casing 5 set in the propulsion mechanism, and connected to the cutter 3 of the leading conduit 4.

In such a state, the excavation cutter 3
And, the screw 6 is rotated and the propulsion mechanism is operated, so that a horizontal shaft having a diameter slightly larger than the outer diameter of the buried pipe 1 for propulsion method is formed in the ground. At this time, the earth and sand generated when excavating the horizontal shaft is carried into the shaft 2 by the screw 6 in the casing 5. When the shaft is formed in this manner, the propulsive force of the propulsion mechanism is transmitted to the front conduit 4 by the casing 5 and the main pipe 11 of the buried pipe 1, and the front conduit 4 and the buried pipe 1 move inside the shaft. Be promoted to.

After that, when the buried pipe 1 is pushed into the shaft formed in the ground leaving the receiving port 17 at the rear end portion, the buried pipe 1, the casing 5, and the screw 6 are removed from the propulsion mechanism and propelled. Retract the mechanism. Then, as shown in FIG. 3, the embedded pipe 1 for the subsequent propulsion method, the casing 5 and the screw 6 are set in the propulsion mechanism in the order fitted inside, and the insertion port 18 of the subsequent embedded pipe 1 is set. , Inserted in the receiving port 17 of the preceding buried pipe 1. Subsequent casing 5
Is also connected to the preceding casing 5, and the following screw 6 is also connected to the preceding screw 6.

In such a state, the propulsion mechanism is operated and the cutter 3 and the screw 6 are rotationally driven. At this time, the propulsive force of the propulsion mechanism causes the leading end surface of the insertion opening 18 of the subsequent buried pipe 1 to abut against the end surface of the main pipe 11 at the inner rear portion of the receiving opening 17 of the preceding buried pipe 1, The buried pipe 1 presses the front conduit 4, and the cutter 3 further forms a horizontal shaft in the ground. Then, the pair of buried pipes 1, the pair of casings 5, and the pair of screws 6 pressed by the propulsion mechanism are sequentially propelled in the formed horizontal shaft. The earth and sand excavated by the cutter 3 are carried into the shaft 2 by the preceding and succeeding screws 6 in the preceding and succeeding casings 5.

Thereafter, the same operation is sequentially repeated to lay a plurality of buried pipes 1 joined to each other over the vertical shafts.

A plurality of buried pipes 1 for the propulsion method laid in the ground in this way are the leading buried pipe 1 and the trailing buried pipe 1.
At the connection portion with, the front end surface of the main pipe 11 forming the insertion port 18 of the subsequent buried pipe 1 is brought into contact with the rear end face of the main pipe 11 at the inner back of the receiving port 17 of the preceding buried pipe 1. hand,
The propulsive force of the subsequent buried pipe 1 is transmitted to the entire preceding buried pipe 1, and the collar pipe 13 and the cover pipe 1
No propulsive force is transmitted to 4. Therefore, there is no possibility that the color tube 13 and the cover tube 14 will be damaged.

The collar pipe 13 forming the receiving port 17 of the preceding buried pipe 1 is supported by the packing 12 having elasticity with respect to the main pipe 11 of the preceding buried pipe 1, and the collar pipe 13 of the succeeding buried pipe 1 is Since the insertion port 18 is supported by the sealing material 19 having elasticity, it has a great flexibility with respect to each of the preceding and succeeding buried pipes 1,
Even if a bend occurs between both buried pipes 1, each buried pipe 1
The connection part of is in a state of following the bend. Even if a bend occurs in the connection part of each buried pipe 1, the connection part is
Since it is sealed by the packing 12 and the sealing member 19, there is no risk of water leakage or the like occurring at the connecting portion.

[0036]

As described above, in the buried pipe for propulsion method of the present invention, the end exposed from the cover pipe fitted to the outer periphery of the main pipe is covered with the cylindrical packing, and By fitting and supporting the base end of the collar tube that is separate from the cover tube, a receiving port is formed at the tip of the collar, and the receiving port and the insertion port that is inserted into the receiving port Since a cylindrical seal member is interposed between the collar tube and the tube, the collar tube has a great flexibility with respect to the main tube and the inserted insertion port. Therefore,
Even if it is laid on a soft ground that sinks the ground, even if it is curved due to the ground sinking, it is prevented from being damaged. Since the cover tube and the collar tube have the same outer diameter, there is no possibility that a large resistance will be applied even when propelled in the horizontal shaft. Since the propulsive force applied to each buried pipe when propelled in the horizontal shaft is transmitted only between the main pipes, there is no risk of damage to the cover pipe and the collar pipe.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing an example of a buried pipe for a propulsion method according to the present invention.

FIG. 2 is a vertical cross-sectional view illustrating a state in which the buried pipe for the propulsion method is laid in the ground by the propulsion method.

FIG. 3 is a vertical cross-sectional view illustrating a state in which the buried pipe for the propulsion method is laid in the ground by the propulsion method.

[Explanation of symbols]

 1 Buried pipe for propulsion method 11 Main pipe 12 Packing 13 Color pipe 14 Cover pipe 15 Packing 16 Backfilling material 17 Receiving port 18 Inserting port

Claims (1)

[Claims] 1. A buried pipe for a propulsion method which is sequentially propelled and laid in a shaft formed in the ground, the main pipe having a constant inner and outer diameters along its entire length, and each of these main pipes. A cover tube fitted to the main pipe so that each end of the main pipe is exposed, and an elastic cylindrical packing fitted to cover one end of the main pipe exposed from the cover pipe. And a proximal end portion is fitted to this packing so that a distal end portion extending in the axial direction from the main pipe serves as a receiving port, and the axial length of the receiving port is the other exposed end of the main pipe. A collar tube having an outer diameter equal to the outer diameter of the cover tube and shorter than the axial length of the portion, and an elastic cylindrical seal disposed on the inner peripheral surface of the tip portion which is the receiving port of the color tube. And a member Buried pipe for propulsion method.