JPH11230413A - Joint structure of earthquake resistant propulsion pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To cover a member, such as a press ring, a fastening bolt, or a rubber ring for seal, with earthquake resistant provided through easy and simple structure when earthquake resisting pipes are laid through a propulsion method. SOLUTION: One end of a straight pipe forms a spigot 2, the other end forms a socket 3 capable of receiving the spigot 2, and an outer surface is covered with a sheathing material 11 such that a portion, except a spigot part 2A, extending from the tip of the socket to the spigot has the same outside diameter. The so formed propulsion pipe 1 is pushed with a liner 4 inserted in the tip of the spigot 2 and inserted in the socket 3. In a so formed earthquake propulsion pipe, a space between a socket end face 3A and the end face of the sheathing material 11 of the other pipe is filled with an embedding material 12 being approximately the same thickness as that of the sheathing material and divided in a peripheral direction. An annular cover material 13 having expandability and contractility is mounted in a fit-in state on the outer surface of the embedding material 12.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a joint structure for an earthquake-resistant propulsion pipe.

[0002]

2. Description of the Related Art As a method of laying underground pipes, a propulsion method is known. In this propulsion method, the insertion port of the inserted pipe is brought into contact with the back end of the new insertion pipe, and the propulsion force is transmitted from this abutting part to the preceding pipe. The axial pushing allowance is completely zero.

[0003] Therefore, if the above-mentioned construction method is used as it is, it cannot be applied to the laying of seismic pipes, which have been increasing in recent years, since the joint portion cannot be expanded or contracted at all in response to the fluctuation of the ground. Therefore, in order to be able to lay the seismic pipe by the propulsion method, FIG.
As shown in (b), a liner 4 for forming an expansion / contraction allowance S is inserted between the end of the insertion port 2 of the propulsion pipe 1 and the end of the receiving port 3,
In this state, the pipe 1 is propelled by the propulsion method, and the liner 4 is removed after the pipe is laid, thereby providing a necessary gap S for the expansion and contraction.

In FIGS. 7A and 7B, reference numeral 5 denotes an inner cement lining layer of the ductile propulsion pipe 1, reference numeral 6 denotes a separation prevention ring, reference numeral 7 denotes a rubber ring, reference numeral 8 denotes a pressing ring, and reference numeral 9 denotes a protective cover.

[0005]

By the way, the above-mentioned propulsion pipe is covered with an exterior material made of concrete or the like except for the opening 2A on the outer periphery of the pipe in order to reduce the propulsion resistance when propelling underground.

In the case of a joint in which the push ring 8 and the fastening bolt 10 are attached to the outer surface of the receiving port as shown in FIG. 7A, a cover is provided to protect the push ring 8 and the fastening bolt 10 from earth and sand and grout. 9 is attached.

As shown in FIG. 7B, in the case of a joint of the type sealed with a rubber ring 7, a cover 9 is attached to protect the rubber ring 7 from penetration and press-fitting of earth and sand or grout.

When the cover 9 is not an earthquake-resistant tube, there is no need to consider the expansion and contraction allowance. For example, as shown in FIG. What was necessary was just to fasten or to weld together etc. with a member (not shown) integrally.

However, in order to provide earthquake resistance, the movement of the gap S formed by the liner is allowed.
(A) As shown in (b), the base end surface 9A of the cover body 9 having an inverted L-shaped cross section is attached to the outer periphery of the insertion opening 2 by welding or the like,
It is necessary that the other end abuts along the outer covering layer 11 of the receiving port 3 to provide a sliding allowance s so that the receiving port 2 and the receiving port 3 can move relatively in the axial direction inside the cover 9. there were.

However, since the welding work of the cover body 9 is a work with a narrow gap, it is a difficult work requiring advanced technology, and this welding work must be repeated every time the propulsion pipe is connected. There was a problem that the effect on the work efficiency of the entire construction method could not be ignored.

In addition, as a propulsion method, a drilling pipe is advanced along a pipeline and propelled by following the pipe, or the pipe is excavated by the drilling pipe and then propelled again. In the case of the construction method, there is no need for a very strong cover because the earth pressure in the radial direction is hardly applied to the joint.
Such a cover has a problem that it is uneconomical in terms of structure and work.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and when an earthquake-resistant pipe is to be laid by a propulsion method, members exposed to the outside of the pipe, such as push rings and bolts, earth and sand or grout. It is an object of the present invention to cover a rubber ring for sealing or the like which causes a problem when penetrated or press-fitted with an easy and simple structure while providing earthquake resistance.

[0013]

In order to achieve this object, the present invention relates to the above-mentioned seismic propulsion pipe, wherein the thickness between the end face of the receiving port and the end face of the exterior material of the other pipe is substantially the same as that of the exterior material, and The filling material made of a soft material divided in the direction was filled, and an annular cover material having elasticity was fitted to the outer surface of the filling material.

[0014] With this configuration, the gap formed between the insertion portion and the end face of the receiving port is filled with an embedding material, and the embedding material is tightly held by the annular cover material, so that the support is also ensured.

[0015]

Next, an embodiment of a joint structure for an earthquake-resistant propulsion pipe according to the present invention will be described. FIG. 1 is an axial sectional view of a main part of a pipe wall according to an embodiment of the present invention, and FIG.
FIG. 3 is a sectional view taken along line XX of FIG.

The joint structure of the seismic propulsion pipe according to the present invention is shown in FIG.
As shown in FIG. 3, between the end face 3A of the receiving port and the end face of the exterior material 11 of the insertion port 2 of the other pipe, there is provided a cutout space 12A having substantially the same thickness as the exterior material 11 and capable of accommodating the push ring 8 and the fastening bolt 10. ,
2 and 3 in the circumferential direction as shown in FIG.
The divided (embedded) embedding material 12 is filled, and an annular cover material 13 having elasticity is fitted on the outer surface of the embedding material 12.

In the above, the embedding material 12 is inserted
When a strong axial external force due to an earthquake or the like is applied between the and the receiving port 3, the molded article has a strength such that it is compressed or deformed, and a molded article such as hard foamed rubber or hard foamed styrene is used. .

The embedding material 12 is disposed along the outer surface of the insertion opening 2 with no gap as shown in FIG. The cover material 13 fitted to the outer surface of the embedding material 12 is a stretchable band ring body such as rubber or urethane rubber.

The total thickness of the layer composed of the embedding material 12 and the cover material 13 is made smaller than the thickness of the exterior covering layer 11 as shown in FIG. This is to avoid friction with the surrounding ground during propulsion.

Next, the construction of the joint structure for an earthquake-resistant propulsion pipe according to the present invention will be described. The seismic propulsion pipe is shown in Fig. 7.
Although any of the pipes having the pipe joints shown in FIGS. 7A and 7B are applicable, the propulsion pipe shown in FIG. 7A having a complicated structure will be described.

As shown in FIG. 3, on the receiving side of the propulsion pipe 1, a lock ring 6 is installed in the receiving port 2.
A cover material 13 is left on the outer surface of the outer cover 11, and the insertion opening 2, which is provided with the sealing rubber ring 7, is inserted into the receiving opening 3 through a liner 4 at the tip, and a pressing ring 8 is attached, and a fastening bolt 10 is attached. The sealing rubber ring 7 is compressed by tightening.

Next, as shown in FIG.
2 is filled from the outer surface of the press ring 8 to the end surface of the exterior material 11 facing the insertion portion 2A, and after covering the entire circumference, the cover material 13 is pulled back from the insertion surface as shown by the arrow to cover the outer surface of the embedding material 12, The state shown in FIG.

Therefore, the embedding material 12 is held on the outer periphery of the insertion opening by the contraction force of the cover material 13. Thereafter, the pipe 1 is propelled underground by the propulsion method.

At this time, since the advanced drilling pipe precedes the ground to be propelled, or a drilling effect is formed by the drilling pipe, the cover member 14 receives almost no radial pressure from the ground. .

In the case of the pipe-in-pipe method, such as renewal of an old pipe, the propulsion pipe is propelled inside the old pipe, and in this case, the radial pressure becomes zero. Therefore, if the cover material 13 is set inside the outer covering layer 11, there is no damage at the time of propulsion, and earth and sand and grout enter the push ring 8, the fastening bolt 10 and the sealing rubber ring 7. To prevent

After the completion of the pipe laying, the liner 4 is removed from the inside of the pipe as shown in FIG. When a large external force such as an earthquake is applied and an axial expansion and contraction force is applied to the pipe, the embedding material 12 is compressed and deformed as shown in FIG.
There is no resistance to expansion and contraction of expansion and contraction S.

The joint structure of the seismic propulsion pipe described above is of a type in which the push ring 8 and its fastening bolt 10 are exposed to the outside, but the joint shown in FIG. Can be applied and implemented.

[0028]

As described above, according to the joint structure for an earthquake-resistant propulsion pipe of the present invention, a joint in which the push ring and its fastening bolt are exposed to the outside, or a rubber ring for sealing is protected from earth and sand and grout. When the propulsion method is performed using pipes that need to be completed, these protections can be completed only by attaching the embedding material and the cover material, making the work much easier than conventional welding of the cover, etc. The push ring of the joint portion and its fastening bolt can be reliably protected, and can be easily compressed and deformed during expansion and contraction, so that the reliability of earthquake resistance can be improved.

[Brief description of the drawings]

FIG. 1 is an axial sectional view of a main part of a tube wall according to an embodiment of the present invention.

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

FIG. 3 is an axial cross-sectional view of a main part of the tube wall showing an assembled state of the embodiment of the same invention.

FIG. 4 is an axial cross-sectional view of a main part of the tube wall showing an assembled state of the embodiment of the invention.

FIG. 5 is an axial half cut sectional view showing a completed assembly state of the embodiment of the invention;

FIG. 6 is a partial cross-sectional view of a main part of the tube wall showing an expanded and contracted state according to the embodiment of the present invention.

FIG. 7 is a partial cross-sectional view of a main part of a conventional pipe wall.

FIG. 8 is a partial cross-sectional view of a main part of another conventional pipe wall.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Propulsion pipe 2 Insertion port 3 Reception port 3A Reception port end face 4 Liner 5 Inner cement lining layer 6 Detachment prevention ring 7 Rubber ring 8 Press ring 9 Cover 10 Fastening bolt 11 Exterior material 12 Embedded material 12A Notch space 13 Annular cover material S with clearance for expansion and contraction

Claims (1)

[Claims] An exterior material having one end of a straight pipe as an insertion port and the other end as a reception port capable of receiving the insertion port, and having the same outer diameter from the tip of the reception port to the insertion port except for the insertion port on the outer surface. In the seismic propulsion pipe which is propelled in the pipe direction by the propulsion method in a state where the propulsion pipe covered with the above is inserted into the reception port with a liner inserted at the tip of the insertion port, the exterior material of the other pipe from the reception port end face A seismic propulsion, characterized in that an embedding material having substantially the same thickness as the exterior material and divided in the circumferential direction is filled between the end faces, and an annular cover material having elasticity is fitted on an outer surface of the embedding material. Pipe joint structure.