JP2000192779A - Joint structure of pipe for use in earthquake-resistant pipe propulsion method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily cover members exposed outside of an earthquake-resistant pipe, such as pushing wheels and bolts, and sealing rubber wheels or the like which cause troubles if soil or grout infiltrates or presses into them, with a simple structure while imparting earthquake resistance. SOLUTION: In an earthquake-resistant pipe propulsion method, a propulsion pipe 1 which comprises a straight pipe with a spigot 2 at one end and with a socket 3 capable of receiving the spigot 2 at the other end, and which is covered on its outer surface except the spigot 2 portion with a sheath material 11 having the same outside diameter from the end of the socket to the spigot 2 portion is propelled toward a pipeline, with a liner 4 inserted through the end of the spigot 2 into the socket 3. A thin-plate cylindrical cover 13 is fitted between the end face of the socket portion sheath material 11 and the end face of the sheath material 11 of another pipe in such a way as to be generally flush with the sheath material 11, and an embedded material 12 is provided between the inner surface of the cylindrical cover 13 and the outer surface of the spigot 2.

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.

Further, in order to lay a seismic pipe capable of changing in both directions of expansion and contraction at the joint portion 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 to provide a necessary gap S for expansion and contraction.

In FIGS. 8 (a) and 8 (b), reference numeral 5 denotes an inner surface cement lining layer of the ductile propulsion pipe 1, 6 denotes a detachment prevention ring, 7 denotes a rubber ring, 8 denotes a pressing ring, and 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. 8A, 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. 8 (b), in the case of a joint of the type sealed with the 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.

Further, in order to provide earthquake resistance, the gap S formed by the liner is allowed to move.
(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,
The other end must be in contact with the exterior covering layer 11 of the receiving port 3 to provide a sliding allowance s.

However, since the welding work of the cover body 9 must be repeated every time the propulsion pipe is connected, the effect on the working efficiency of the entire propulsion method cannot be ignored.

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, grout, etc. It is an object of the present invention to cover a sealing rubber ring with an easy and simple structure while providing earthquake resistance.

[0011]

In order to achieve this object, the joint structure of the pipe in the seismic pipe propulsion method of the present invention is as follows.
In the above-mentioned earthquake-resistant propulsion pipe, a thin-plate cylindrical cover is externally fitted so as to be substantially flush with the outer material between the outer surface of the receiving portion and the outer material end surface of the other pipe. An embedding material is provided between itself and the outer surface.

With this configuration, the gap formed between the insertion portion and the end surface of the exterior material of the receiving portion is protected by the thin tubular cover and the embedding material, so that it is protected from intrusion of earth and sand during the propulsion method. .

In the above description, the case where the filling material is provided includes a case where the molded body is provided in contact with the molded body, and a case where the filling material is filled and made effective.

[0014]

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 tube wall according to an embodiment of the present invention, and FIG. 2 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. 5, a sheet metal tubular cover 13 is fitted between the receiving end face 3A and the outer casing 11 end face of the insertion opening 2 of the other pipe so as to be substantially flush with the outer casing 11. A filling material 12 made of a foamed synthetic resin is filled between the opening 13 and the outer surface of the insertion opening 2.

In the above description, cutout steps 11A, 11A for installing the cylindrical cover 13 are formed near the ends of the exterior material 11 of the receiving port 3 and the exterior material 11 of the insertion opening 2. Cover 13 is provided on the notch step 11A as shown in FIG.
(A) It is installed without particularly providing the extension allowance S as shown in (b).

In FIG. 2, reference numeral 14 denotes a rivet for fixing an end of the band-shaped sheet metal 13a when winding the band-shaped sheet metal 13a to form the tubular cover 13.

As shown in FIG. 2, the embedding material 12 to be filled into the inner surface of the cylindrical cover 13 is a molded product made of a foamed synthetic resin divided into two or four parts which can be fitted on the outer surface of the insertion opening 2. Is done.

The embedding material 12 is inserted into the insertion port 2 and the reception port 3 when a strong axial external force is applied due to an earthquake or the like.
For example, a molded article such as foamed styrene or foamed rubber is used, and is disposed along the circumferential outer surface of the insertion opening 2 without gaps as shown in FIG. Is done.

Next, the construction of the joint structure for an earthquake-resistant propulsion pipe according to the present invention will be described.

The earthquake-resistant propulsion pipe is shown in FIGS.
Although any object having the pipe joint shown in (b) is applicable, the propulsion pipe shown in FIG. 8A having a complicated structure will be described.

As shown in FIG. 3, a lock ring 6 is installed in the receiving port 2 of the propulsion pipe 1, and the insertion port 2 provided with a sealing rubber ring 7 is inserted into the receiving port 3 through the liner 4 at the tip. Then, the push ring 8 is attached, the fastening bolt 10 is tightened, and the sealing rubber ring 7 is compressed.

Next, as shown in FIG.
2 is disposed between the outer surface of the press ring 8 and the outer surfaces of the outer materials 11 and 11 to cover the entire circumference, and then the belt-shaped metal plate 13a is attached to the outer materials 11 and 1
One of the cutout steps 11a, 11a is wound around the outer circumference, and a rivet 14 (shown in FIG. 2) is driven in to form a cylindrical cover 13 and fitted outside.

The inner surface of this cylindrical cover 13 is embedded material 1
Since it is supported by 2, even if it is made of a thin sheet metal, it does not easily deform into a recess.

Therefore, when the pipe 1 is directly propelled into the ground by the propulsion method, or when the inside of a pod such as a fume pipe already inserted as a pod method is propelled,
The cylindrical cover 13 is hardly subjected to radial pressure from the ground, so that it is not deformed and damaged, and earth and sand and grout enter the push ring 8, the fastening bolt 10 and the sealing rubber ring 7. Can be prevented.

After 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, as shown in FIG.
Numeral 3 is made of sheet metal and easily deformed, has little resistance to the axial displacement of the tube, and has an embedding material 12.
Is compressed and deformed, and does not become the expansion and contraction resistance of the expansion and contraction allowance S.

A push ring 8 is used as a joint structure for the seismic propulsion pipe.
Although the joint of the type in which the fastening bolt 10 is exposed to the outside has been described, a joint as shown in FIG. 8B can be similarly applied and implemented.

In the above-described embodiment, the case where the filler is firstly packaged on the outer surface of the insertion opening 2 has been shown. However, as shown in FIG. Rivet 1
4 and the cylindrical cover 13 is fitted around the nozzle 1
3b may be inserted, and a filler 12a such as a foamed synthetic resin material or mortar may be injected and filled and cured.

[0031]

As described above, according to the pipe joint structure of the seismic pipe propulsion method of the present invention, the push ring or the joint of the type in which the fastening bolt is exposed to the outside, or the rubber ring for sealing is made of earth or sand. When propulsion is performed using pipes that need to be protected from grouting, these protections can be completed with only the embedding material and the thin tubular cover, making the work much easier than conventional welding of covers. Becomes

In addition, the protection of the push ring of the joint portion and the fastening bolt thereof can be surely performed, and since it is easily compressed and deformed at the time of expansion and contraction, there is an effect 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 pipe 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 sectional view of a main part of the tube wall showing an assembled state of the embodiment of the invention.

FIG. 4 is an axial 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-sectional view showing a completed assembly state of the embodiment of the same invention.

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

FIG. 7 is a cross-sectional view of a main part of another configuration example of the invention.

FIG. 8 is a partial cross-sectional view of a main part of a conventional pipe wall, and FIG.
FIG. 2B is a partial cross-sectional view of a main part of a pipe wall of a joint in which a push ring 8 and a fastening bolt 10 are attached to an outer surface of a receiving port, and FIG.

[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 Separation prevention ring 7 Rubber ring 8 Push ring 9 Cover 10 Fastening bolt 11 Exterior material 12 Embedded material 13 Thin tubular cover S Gap

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 front end of the reception port to the insertion port except for the insertion port on the outer surface. In a seismic pipe propulsion method in which the propulsion pipe covered with the above is inserted into the receptacle with a liner inserted at the tip of the receptacle and propelled in the direction of the pipeline by the propulsion method, the end of the receptacle exterior material is A thin-plate cylindrical cover is externally fitted between the end surfaces of the outer material of the pipe so as to be substantially flush with the outer material, and an embedding material is provided between the inner surface of the cylindrical cover and the outer surface of the insertion opening. Pipe joint structure in the seismic pipe propulsion method.