JP2001049988A - Pipe reinforcement structure for bending propulsion in propulsion method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To smoothly perform a propelling construction method even in a curved part by allowing a reinforcing material to abut to an inner peripheral surface of the socket inmost end abutting to the inserting port tip in a pipe propelling construction method for propelling a pipe by pushing the inserting port tip against the socket inmost end. SOLUTION: A reinforcing material 8 forms a circular arc piece along the inside surface circumference of a propelling pipe 4 to abut in the circumferential direction along the edge of the socket inmost end 5a. A support column 9 is provided with an extensible/contractible device 9a in an intermediate part so as to pressingly arrange the reinforcing material 8 on the socket inmost end. The reinforcing material 8 is brought into pressure contact with an inside surface of a pipe 1 along the circumference of the socket inmost end 5a by extending the support column 9. Thus, even if an abutting part of the inserting port tip 6a and the socket inmost end 5a is displaced since the propelling pipe 4 approaches a curved part of a pipeline, since the socket inmost end 5a is supported from the inside surface by the reinforcing material 8, or the inserting port tip 6a abuts to the reinforcing material 8, and since shaft directional force is received thereby, shear fracture of a pipe wall corner part is prevented so that the pipe can be smoothly propelled even in the curved part.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe reinforcing structure for bending and propulsion in a propulsion method, and more particularly to a pipe reinforcing structure for propelling a pipe along a curved conduit by a propulsion method.

[0002]

2. Description of the Related Art When a pipe is buried underground, a propulsion method is known in which a pipe is propelled from the starting shaft into the ground in the direction of the pipe. When this propulsion method is carried out, generally, as shown in FIG. 7, the insertion port 6 of the propulsion pipe 4 is sealed with the receiving port 5 of the propulsion pipe 4 having the mortar layer 2 and the outer steel pipe 3 integrally provided on the outer surface of the pipe 1. Insert the rubber tip 7 through the rubber ring 7
a is brought into contact with the back end 5a of the receiving port, and a propulsive force is given in the direction of the arrow to propel the vehicle underground.

[0003]

When a straight pipe is propelled by the above-mentioned propulsion method, the end face 6a
Since the entire surface and the entire back end 5a of the receptacle 5 are in uniform contact with each other, the propulsive force transmission force is also dispersed. However, in a curved portion of the pipe, as shown in FIG. The contact portion at the end 5a is limited only to the inside of the pipe curved portion, and the force is concentrated.
As shown in the partial enlarged view of FIG.
Had the problem of shear fracture.

[0004] In addition, if such a break occurs, the distal end 6a of the insertion port 6 is reduced in diameter and pushed into the pipe from the back end 5a of the receiving port, so that the propulsion method cannot be continued any more. . The present invention solves the above-described problems, and when the pipe is curved, prevents the pipe from being damaged due to the concentration of the propulsive force and preventing the insertion of the insertion port from being reduced in diameter. It was made to be implemented.

[0005]

According to a first aspect of the present invention, there is provided a pipe reinforcing structure for bending and propulsion in a propulsion method according to the first aspect of the present invention, which comprises: The reinforcing member is brought into contact with the inner peripheral surface at the back end of the receiving port to which the insertion tip comes into contact. According to the present invention, the reinforcing member is brought into contact with the back end of the receiving port that receives an excessive pressing force, and the pressing force is also supported by the reinforcing material. The propulsion method can be continued similarly to the straight section.

According to a second aspect of the present invention, there is provided a pipe reinforcing structure at the time of bending and propulsion according to the above-mentioned propulsion method, wherein a radial support member is inserted into an inner surface of the insertion opening in the pipe reinforcing structure at the time of bending and propulsion according to the above-mentioned propulsion method. ADVANTAGE OF THE INVENTION According to this invention, it can prevent that an insertion hole deform | transforms and enters into a pipe | tube over a receiving port back end.

[0007]

Next, an embodiment of a pipe reinforcing structure at the time of bending propulsion in the propulsion method of the present invention will be described. Embodiment 1 FIG. 1 is a cross-sectional view of a main part of a pipe reinforcing structure during bending propulsion in a propulsion method according to Embodiment 1 of the present invention, and FIG.
It is an X-ray sectional view.

The same parts as in the conventional example are denoted by the same reference numerals, and a detailed description thereof will be omitted. In FIG. 1, reference numeral 8 denotes a reinforcing material, which is formed as an arc piece along the inner circumference of the propulsion pipe 4 as shown in FIG. 2, and as shown in FIG.
Are abutted in the circumferential direction along the edge of. Reference numeral 9 denotes a support column, and an extension device 9a is provided at an intermediate portion so as to press the reinforcing member 8 against the back end of the receptacle. The expansion and contraction device 9a is, for example, screwing the male screw portions 9b and 9c of the support pillar 9 into a turnbuckle 9a having upper and lower female screw holes formed on the same axis,
A support pillar that expands and contracts by rotation of the turnbuckle 9a is used.

The reinforcing members 8 and the supporting columns 9 are made of steel or cast steel. According to the above structure, the support column 9
When the reinforcing member 8 is pressed against the inner surface of the pipe 1 along the circumference of the receiving end 5a, the propulsion pipe 4 reaches the curved portion of the pipe, and the propulsion pipe 4 reaches the end of the insertion port 6 and the receiving end 5 at the back end. Even if the contact portion is displaced as shown in FIG. 3, the inner end 5a of the socket is supported by the reinforcing member 8 from the inner surface, or the front end 6a of the insertion port contacts the reinforcing member 8,
As a result, the axial force is received, so that the propulsion force is distributed to the receiving end 5a and the reinforcing member 8.

[0010] As a result, the shear fracture of the tube wall corner 1a is prevented, and the pipe can be propelled without difficulty even in a curved portion. Second Embodiment FIG. 4 is a sectional view of a main part of a second embodiment. In addition, FIG.
2 denote the same or corresponding members as those shown in FIG.

In FIG. 4, reference numeral 8a denotes an engaging edge, which extends in the insertion direction along the inner periphery of the reinforcing member 8 and is formed integrally with the reinforcing member 8. According to the reinforcing structure of the second embodiment, even when the insertion opening 6 attempts to be displaced inward when approaching the pipe curved portion, further displacement is prevented after engaging with the engagement edge 8a. Therefore, the bending angle of each joint is averaged, and it is possible to prevent only a specific joint from being largely bent. Third Embodiment FIG. 5 is a sectional view of a main part of a third embodiment.

In FIG. 5, the reinforcing member 8 is fixed to the inner surface of the pipe 1 along the receiving end 5a by a bolt 10. The bolt 10 is screwed into and attached to a female screw hole 11 drilled on the back side of the receiving end 5a. According to the third embodiment, since the support pillar 9 is not required for fixing the reinforcing member 8, it does not hinder the work in the pipe. In addition, it is possible to select and attach necessary parts.

The reinforcing member 8 having the engaging piece 8a as shown in the second embodiment can also be used. Fourth Embodiment FIG. 6 shows a pipe reinforcing structure according to a fourth embodiment. In FIG. 6, reference numeral 12 denotes a radial support member, which is provided at the open end of the insertion opening 6 so as to support the inner surface in the radial direction.

The radial support member 12 is composed of an arc member 12a in contact with the inner surface of the insertion opening 6 and a column member 12b supported in the radial direction. The column member 12b has a telescopic device (the same as the telescopic device 9a described above). (Not shown). According to the fourth embodiment, deformation of the insertion port 6 in the diameter reducing direction is prevented by the radial support member 12, so that even if an accident that the insertion end face 6a is broken occurs, the diameter of the insertion port 6 is reduced. It is prevented from intruding inward beyond the back end 5a.

Further, although the illustrated example of the reinforcing member 8 on the side of the receiving end 5a is fixed by bolts 10, the reinforcing member 8 supported by the supporting column 9 as shown in FIG. 1 may be applied. it can.

[0016]

As described above, according to the pipe reinforcing structure at the time of bending and propulsion in the propulsion method of the present invention, when the pipe is propelled by the propulsion method, the bent end portion of the pipe is connected to the insertion end face. Even when the propulsion force concentrates due to contact with the back end at one location, the breakage of the pipe is prevented, and the pipe can be propelled safely.

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part of a first embodiment of the present invention.

FIG. 2 is a sectional view taken along line XX of FIG.

FIG. 3 is a sectional view of a main part of a second embodiment of the present invention.

FIG. 4 is a sectional view of a main part of a third embodiment of the present invention.

FIG. 5 is a sectional view of a main part of a fourth embodiment of the present invention.

FIG. 6 is a sectional view of a main part of a fifth embodiment of the present invention.

FIG. 7 is a sectional view of a main part of a conventional example.

FIG. 8 is a sectional view of a main part of a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Pipe 2 Mortar layer 3 Exterior steel pipe 4 Propulsion pipe 5 Reception port 5a Reception port back end 6 Insertion port 6a Insertion tip end 7 Sealing rubber ring 8 Reinforcement material 8a Engagement edge 9 Support column 9a Telescopic device 10 Bolt 11 Female screw hole 12 Radial support material 12a Arc material 12b Column member

Claims (2)

[Claims] Claims: 1. In a pipe propulsion method in which an insertion end is pressed against an inner end of a receiving port, a reinforcing material is abutted on an inner peripheral surface of an inner end of the receiving port to which the inserting end is abutted. A pipe reinforcement structure for bending propulsion in the propulsion method. 2. The pipe reinforcement structure for bending propulsion in the propulsion method according to claim 1, wherein a radial support member is inserted into an inner surface of the insertion hole.