JPH11230478A - Fitting structure of aseismatic 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 easy and simple structure while imparting earthquake resistance for a pipe fitting when an aseismatic pipe is laid through propulsion method. SOLUTION: One end of a straight pipe forms a spigot 2 and the other end forms as socket 3, and an outer surface, except a spigot part, extending from a socket tip to a spigot part is covered with a sheathing 11 to bring it into the same outside diameter to form an aseismatic propulsion pipe 1. In this propulsion pipe 1 wherein a liner 4 is interposed at the tip of the spigot 2 and inserted in the socket 3, a slit groove 12 opened to an end face is peripherally formed in an annular shape in the end face 11A of the sheathing materiel 11 on the outer surface of the socket 3. Meanwhile, a stepped notch surface 13 is formed in the outer peripheral surface of the end part of the sheathing material 11 for the outer surface of the socket. In a portion ranging from the slit groove 12 to the notch surface 13, one end 14A is inserted in the slit groove 12 and the other end 14B has length reaching the notch surface 13 of the outer surface of the spigot. A cover material 14 divided into a plurality of sections in the peripheral direction of the socket 2 is arranged throughout the whole periphery of the socket 3.

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, since there is almost no earth pressure applied to the joint portion, a very tough cover is not required, and there has been a problem that such a cover 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 seal rubber 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, according to the present invention, in the above-mentioned seismic propulsion pipe, a slit groove opening in the outer surface of the outer surface of the receiving port is formed in an annular shape in the circumferential direction. On the other hand, a step-shaped notch surface is formed on the outer peripheral surface of the end of the exterior material on the insertion outer surface, and one end is inserted into the slit groove from the slit groove to the notch surface, and the other end is the insertion hole. A cover member having a length that reaches the cutout surface of the outer surface and divided into a plurality of pieces in the circumferential direction of the receiving port is arranged along the entire circumference of the receiving port.

With this configuration, the cover for protecting the pressing ring and the fastening bolt can be fitted in a state where there is an allowance between the slit groove of the receiving port and the cutout surface of the outer surface of the insertion port. The cover can be erected while securing.

[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 cross-sectional view of a main portion of a tube wall according to an embodiment of the present invention, FIG. 2 is an axial cross-sectional view of a main portion of the tube wall showing a state where a joint portion is joined, and FIG. -It is an X-ray sectional view.

The joint structure of the seismic propulsion pipe according to the present invention is shown in FIG.
As shown in the figure, the end surface 11A of the exterior material 11 on the outer surface of the receptacle 3
2, a slit groove 12 opening in the end face 11A is formed in a ring shape in the circumferential direction, and a step-shaped notch face 13 is formed in an end outer peripheral face 11B of the exterior material 11 on the outer surface of the insertion opening 2, and FIG. In a state where the insertion opening 2 is inserted into the reception opening 3 as shown in FIG.
Into the slit groove 12 and the other end 14B into the slot 2
The cover members 14, 14 (two in the illustrated example) having a length reaching the cutout surface 13 of the outer surface and divided into a plurality of parts in the circumferential direction of the receiving port 3 as shown in FIG. 3 are arranged along the entire circumference.

In the above description, the slit groove 12 is
Step surfaces 15A and 15B extending over two steps are formed on the outer peripheral material surface, and steel half pipes 12A having the same thickness as this cross section are anchor bolts 16 and 16 on the outer step surfaces 15A.
It is formed by fixing with.

When the cover member 14 is inserted into the slit groove 12, an axial slit-like opening 12B is provided at one or two positions of the slit groove 12 as shown in FIG. It is formed by using the joining edge of the steel half pipe 12A, and as shown by the dotted line in FIG. 3, is mounted by being rolled up along the circumference.

The cover member 14 is made as thin as possible as shown in FIG. The length of the cover material 14 is
The length between the slit groove 12 and the notch step 13 is shorter than the length from the back end to the notch step notch step back end, and is equal to or less than the length obtained by subtracting the width S formed by the liner 4. It is above.

In the drawing, reference numeral 14C denotes a positioning projection of the cover member 14. Next, 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. 4, on the receiving side of the propulsion pipe 1, a lock ring 6 is installed in the receiving port 3, and on the insertion side,
Insert the insert 2 with the rubber ring 7 for sealing into the liner 4 at the end.
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.
3 is inserted through the side slit 14D of the slit groove 12 from the axial slit opening 12B formed in the side surface of the slit groove 12 as shown in FIG. 3, and the stopper 14C is inserted into the corner of the exterior material 11 as shown in FIG. After being locked, it is passed over the slit groove 12 and the cutout surface 13 on the insertion side.

Then, as shown in FIG. 3, the push ring 8 and the fastening bolt 10 are mounted around the entire circumference in the circumferential direction. In addition, the seam 14E of the cover member 14 after mounting is shifted so as not to overlap with the axial slit-shaped opening 12B.

Thereafter, the pipe 1 is propelled into the ground following the advanced drilling pipe, or the pipe 1 is propelled into a borehole drilled by the drilling pipe. At this time, since the advanced excavation pipe precedes the ground to be propelled or the excavation effect is perforated by the excavation 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, the cover material 14 is not damaged during propulsion,
Prevents earth and sand or grout from entering the pressing ring 8, the fastening bolt 10, or the sealing rubber ring 7.

After completion of the pipe laying, grout is injected into the outer surface of the propulsion pipe to fix the pipe, and at the same time, the liner 4 shown in FIG. When a large external force due to an earthquake or the like is applied and an axial expansion and contraction force is applied to the pipe, as shown in FIG. 6, the cover member 14 moves in a margin between the slit groove 12 and the cutout surface 13, and the expansion and contraction allowance is increased. There is no resistance to the expansion and contraction of S.

[0027]

As described above, according to the joint structure of the seismic propulsion pipe of the present invention, the gap between the joint part outside the propulsion pipe formed by the liner is formed between the slit groove formed on the receiving end face and the outer face of the insertion port. Since it can be completed only by attaching the cover material to be bridged between the formed notch surface, the work is very easy compared to the conventional cover welding and the like, and the push ring of the joint part and its fastening bolt, Alternatively, the seal rubber can be reliably protected, and when it expands and contracts, it slides into the slit groove and contracts, so that the reliability of the 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 an axial cross-sectional view of a main part of a pipe wall showing a state where a joint is joined.

FIG. 3 is a sectional view taken along line XX of FIG. 2;

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

FIG. 5 is an axial sectional view of a main part of the tube wall showing an assembled state according to the embodiment of the present 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, and FIG.
Denotes a type in which the pressing ring and the fastening bolt are exposed at the end face of the receiving port, and (b) denotes a type in which the pressing ring and the like are not exposed.

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

[Description of Signs] 1 Propulsion pipe 2 Insertion port 3 Reception port 4 Liner 5 Inner cement lining layer 6 Detachment prevention ring 7 Rubber ring 8 Press ring 10 Fastening bolt 11 Exterior material 11A End face of exterior side exterior material 12 Slit groove 13 Insertion Notch side of exterior material 14 Cover material S Clearance for expansion and contraction

Claims (1)

[Claims] 1. A propulsion pipe having a straight pipe having one end serving as an insertion port and the other end serving as a reception port. In an earthquake-resistant propulsion pipe that is propelled in a pipe direction by a propulsion method with a liner inserted into the reception port and inserted into the reception port at the front end of the insertion port, the outer surface of the reception port is opened at the end surface of the exterior material. The slit groove is formed annularly in the circumferential direction, on the other hand, a step-shaped notch surface is formed on the outer peripheral surface of the end of the exterior material of the insertion opening, from the slit groove to the notch surface, one end is the slit groove. The cover material having a length that reaches the notch surface of the outer surface of the insertion opening and the other end thereof, and is divided into a plurality of pieces in the circumferential direction of the receiving port, is disposed along the entire circumference of the receiving port. Features a joint structure for seismic propulsion pipes.