JPH11229761A - Liner for seismic propulsion pipe and its removal device - Google Patents

Abstract

(57) [Summary] [Problem] When laying an earthquake-resistant pipe by the propulsion method, the liner inserted to secure the compression allowance between the pipes can be safely removed without requiring a large-scale device. The task is to SOLUTION: This is a liner 11 interposed between a distal end of an insertion port 2 of a propulsion pipe and a rear end of a reception port 3, and has a block shape having a thickness corresponding to a thickness of the insertion pipe 2. The block-shaped main body is provided with a screw hole 12 penetrating in the thickness direction. The screw body 18 is screwed into the screw hole even after the screw body 18 abuts on the inner surface of the receiving port 3 to lift the liner 11.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liner for an earthquake-resistant propulsion pipe and a device for removing the same.

[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, as shown in FIG. 9, a liner 4 that forms an expansion allowance is inserted between the tip of the insertion port 2 of the propulsion pipe 1 and the back end of the receptacle 3. The pipe 1 is propelled by a 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 FIG. 9, reference numeral 5 denotes an inner surface cement lining layer of the ductile propulsion pipe 1, 6 denotes a separation prevention ring, 7 denotes a rubber ring, 8 denotes a pressing ring, 9 denotes a cover, and a pressing ring 8 and a fastening bolt 10 Protects from earth and sand and grout.

[0005]

However, when the propulsion method is carried out by inserting the liner 4 and the liner 4 is removed after the propulsion pipe 1 is laid, the propulsion pipes 1, 1 connected in front and rear are connected in the pipe axial direction. A strong axial compression force acts on the liner 4 as shown by an arrow because the thrust of the pipe and the propulsion force due to the friction between the pipe periphery and the ground act on the liner. Attempting to do so required a large horsepower removal device.

In addition, when the liner is detached by using such a device, there is a risk that the liner may jump off at the moment of detachment, and it is necessary to take safety measures for this.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problem, and when an earthquake-resistant pipe is laid by a propulsion method, a liner inserted to secure a compression allowance between the pipes is not large. The purpose is to allow the device to be safely removed without the need for it.

[0008]

In order to achieve the above object, according to the present invention, a liner inserted between a front end of an insertion port of a propulsion pipe and a rear end of a reception port is provided with a liner of the insertion pipe. A block-shaped body having a thickness corresponding to the thickness was provided, and the block-shaped main body was provided with a screw hole penetrating in the thickness direction.

Accordingly, if a bolt longer than the thickness of the block-shaped main body is screwed into the screw hole and the bolt is rotated after the tip of the bolt is brought into contact with the inner surface of the socket, the liner relatively comes out of the gap. This allows the liner to be removed.

According to a second aspect of the present invention, there is provided a seismic propulsion pipe liner, wherein the propulsion pipe has an inner front end portion and an inner rear end surface which straddle the seismic propulsion pipe liner. A straddling member provided with a through hole at a position on the axis, and a screw body having a length that can be inserted from the through hole of the straddling member to the screw hole of the liner for the earthquake-resistant propulsion pipe are combined.

The structure is such that the liner is pulled up by the straddling member.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of a liner for an earthquake-resistant propulsion pipe according to the present invention will be described. FIG. 1 is a sectional view of an essential part in an axial direction according to an embodiment of the present invention, FIG. 2 is a front sectional view of the essential part, and FIG. 3 is a perspective view.

The seismic propulsion pipe liner 11 of the present invention is inserted between the end of the insertion port 2 of the propulsion pipe 1 and the back end of the receptacle 3.
It has a block shape having a thickness corresponding to the wall thickness t of the insertion tube 2, and the block-shaped main body is provided with a screw hole 12 penetrating in the thickness direction.

In the above, the block-shaped liner 1
1 is made of a material having a strength capable of withstanding the propulsion pressure, and specifically, is made of a metal such as steel, cast iron, or brass. Also,
As shown in FIG. 2, the liner 11 is an arc-shaped block having a circumferential length arranged at a key point on the circumference.

It is desirable to insert a soft connecting member 13 made of rubber or the like between the liners 11. In this way, the plurality of liners 11 can be easily managed, and the circumferential interval of the liners 11 when the liner 11 is set between the insertion opening 2 and the receiving opening 3 is automatically determined and set. Becomes easier.

Further, it is possible to prevent the liner 11 from being scattered when detached from the propulsion pipe 1 as described later. As shown in FIG. 1, the liner 11 is interposed between the distal end of the insertion port 2 of the propulsion pipe and the rear end of the reception port 3 to apply a propulsive force to the pipe to propell along the pipe in a conventional manner. Go.

After laying a pipe in a predetermined pipe line, the liner 1
Remove one. As shown in an enlarged view in FIG. 4, the liner 11 is removed by screwing a bolt 14 having a length longer than the thickness of the liner 11 into the screw hole 12 of the liner 11, preferably a bolt 14 having a length twice or more the thickness. The screw is further screwed even after the tip of 14 contacts the inner wall of the receptacle 3.

As shown in the figure, it is desirable to insert a rubber or metal seat plate 15 before screwing the bolt 14 so as not to damage the inner wall of the receiving port 3. By this screwing, the liner 11 starts to come out of the gap along the bolt 14, and finally comes out completely.

Since this escape depends on the screw pitch of the bolt 14, the escape is performed slowly and the liner 11
Does not jump out. In addition, since only one bolt is extracted, only a bolt and a tool for rotating the bolt, for example, a spanner or a socket wrench (not shown) may be prepared, and can be easily implemented.

FIG. 5 is an axial sectional view of one embodiment of the second aspect of the present invention, and FIG. 6 is a perspective view. The device for removing a liner for an earthquake-resistant propulsion pipe in FIG. 5 includes the liner 1 shown in FIG.
1 and a straddling member 17 having a through-hole 16 provided at a position on the same extension axis as the screw hole 12 of the liner 11 for the earthquake-resistant propulsion pipe, and the through-hole 16 of the straddling member 17. And a screw body 18 having a length that can be inserted through the screw hole 12 of the liner 11 for the seismic propulsion pipe.

In the above, the straddling member 17 has a shape in which one end of the insertion-side leg portion 17A and one end of the reception-side leg portion 17B are integrally connected by a connecting member 17C as shown in FIG. The strength is set to be able to withstand the force when the liner 11 is pulled out.

As shown in FIG. 6, the edges of the legs 17A and 17B are formed in a circular arc shape along the pipe inner surface, and the connecting member 17C is, for example, a flat plate. The connecting member 17C may also be a curved surface along the inner surface of the tube.

As shown, the screw body 18 may be a screw rod 18 without a head and a bolt 18A with a head. In the case of the screw rod 18 having no head, the screw rod 18 is inserted through the through hole 16 of the straddling member 17 as shown in FIG.
Screwed into the screw hole 12 fully.

Next, if the nut 19 is screwed from the tip of the threaded rod 18 and rotated even after contacting the connecting member 17C, the nut 19 does not advance in the liner 11 direction. Is pulled out of the gap together with the screw rod 18.

Accordingly, the liner 11 is slowly pulled out of the gap. When the screw body 18 is a bolt 18A having a head, as shown in FIG. 8, the bolt 18A is inserted through the through hole 16 of the straddling member 17 disposed across the liner 11,
Screw it into the screw hole 12 of the liner 11.

If the bolt 18A is screwed in and the bolt 18 is rotated even after the bolt head comes into contact with the connecting member 17C, the bolt 18 does not advance in the direction of the liner 11, so that the liner 11 Comes from.

Accordingly, the liner 11 is slowly pulled out of the gap.

[0028]

As described above, when the seismic pipe is laid by the propulsion pipe method, a threaded hole is provided in the liner for setting the push-in allowance of the pipe joint in the pipe axis direction, and the threaded hole is fitted to the threaded hole. The screwed body is rotated and the liner is pulled out of the gap by using the relative rotation between the screwed body and the liner, so that a large axial force can be exhibited with a small torque and only simple tools can be used. Work becomes possible.

Further, since the extraction is performed at a speed corresponding to the screw pitch, the extraction is performed slowly.

[Brief description of the drawings]

FIG. 1 is an axial cross-sectional view of one embodiment of the first invention.

FIG. 2 is a front cross-sectional view of a main part when viewed from a receiving opening in a depth direction.

FIG. 3 is a perspective view of the embodiment of the present invention;

FIG. 4 is an essential part cross-sectional view showing a use state of the embodiment of the above invention.

FIG. 5 is an axial sectional view of an embodiment of the invention according to claim 2;

FIG. 6 is a perspective view of the embodiment of the present invention;

FIG. 7 is an essential part cross-sectional view showing a state of use of the embodiment of the present invention.

FIG. 8 is an essential part cross-sectional view showing a use state of another embodiment of the invention.

FIG. 9 is an explanatory sectional view of a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Propulsion pipe 2 Insertion opening 3 Reception opening 11 Liner 12 Screw hole 14 Bolt 16 Through hole 17 Straddling member 18 Screw rod 18A Bolt

Claims (2)

[Claims] 1. A liner interposed between a front end of an insertion port of a propulsion pipe and a rear end of a reception port, wherein the liner has a block shape having a thickness corresponding to a wall thickness of the insertion pipe. A liner for an earthquake-resistant propulsion pipe, wherein a threaded hole is provided in a main body in a thickness direction. 2. The seismic propulsion pipe liner according to claim 1, which is installed over the seismic propulsion pipe liner so as to extend over the inner surface of the insertion end of the propulsion pipe and the inner surface of the rear end of the receiving port. A straddling member provided with a through hole at a position on the axis, and a screw body having a length that can be inserted from the through hole of the straddling member to the screw hole of the liner for the seismic propulsion pipe. A liner removal device for seismic propulsion pipes.