JP2002195454A - Cable member fixing jig - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently pull out a buried pipe in the case of pulling out the buried pipe to be removed throughout its overall length, by repeating such an operation that the end of the buried pipe is held to pull out a part thereof inside a pit, and the part which has pulled out is cut so as to have a cylindrical shape, thereafter the end of the buried pipe is held again to pull out the other one part thereof. SOLUTION: A cable member fixing jig fixes a cable member 1 inserted to an overall buried pipe to the end of the buried pipe in a tensile state in order to tighten a buried pipe A to be removed in the longitudinal direction of a pipe. This jig comprises: a reaction force receiving member 2 capable of locking to the end of the buried pipe in a state in which the cable member is inserted into the buried pipe; and a wedge member 3 capable of fitting in the longitudinal direction of the pipe to a fitting part 4 formed at the reaction force receiving member. To a fitting surface 8 of the fitting part, the cable member is provided so as to bed capable of mounting/ dismounting from the radial direction, and the reaction receiving member is locked to the end of the buried pipe. The cable member is held between the fitting surface of the fitting part and a wedge surface 12 of the wedge member, thereby being locked and fixed to the end of the buried pipe in the tensile state.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for fastening a buried pipe to be removed in the longitudinal direction of the buried pipe in a tensioned state at an end of the buried pipe. The present invention relates to a cord fixing jig.

[0002]

2. Description of the Related Art In a buried pipe drawing method in which one end of a buried pipe to be removed is gripped and pulled out from the ground, a retaining pipe is used at a halfway point of the buried pipe using a brazing pipe joint (socket pipe joint). If there is a joint part with a small blocking force, if you try to pull out by grasping one end of the buried pipe, the joint part will come off and the buried pipe will be cut off in the ground,
The buried pipe may not be pulled out over the entire length. In the above-mentioned buried pipe pulling method, the above-described cord fixing jig is used to remove the buried pipe to be removed so that even if one end of the buried pipe is gripped and pulled out, a joint part having a small retaining force is not removed. It is used for fixing a cord inserted through the entire length to an end of a buried pipe in a tension state, and tightening the buried pipe in a pipe longitudinal direction. As a conventional cord fixing jig, a cylindrical fixing jig B in which a plurality of wire fixing screws 33 are screwed to a cylindrical body 32 is used as shown in FIG. As shown in FIG. 8 (b), a wire (an example of a cord) 1 is inserted through the entire length of the buried pipe A to be removed, and one end thereof is fixed to one end of the buried pipe A. The end of the fixing jig B is inserted into the fixing jig B, and the other end of the fixing jig B is screwed onto the wire 1 tensioned by pulling the other end.
The fixing jig B is locked to the other end of the buried pipe A on the lower side in the drawing direction.

[0003]

Therefore, FIG. 9 (a)
As shown in the figure, a traction device C for gripping and towing the end of the buried pipe A is installed in a pit 34 provided on the lower side in the drawing direction of the buried pipe A, and One end is gripped, a part of the buried pipe A is pulled out into the pit 34, the drawn part 31 is cut into a cylindrical shape, and then the wire 1 is tightened again, and the end of the buried pipe is fixed by the fixing jig B. 9 (b), the end of the buried pipe A is gripped again, and a part of the buried pipe C is pulled out by the towing device C. As a result, the buried pipe A to be removed is repeated. When the wire is pulled out over the entire length, the fixing jig B of the wire 1 is used.
There is a disadvantage that it takes time and trouble to insert and remove the pipe, and the buried pipe A cannot be efficiently pulled out. In other words, in order to repeat the work of grasping one end of the buried pipe A and extracting a part thereof, it is necessary to re-lock the fixing jig B to the end of the buried pipe after cutting the withdrawn portion 31 each time. There is a cylindrical fixing jig B
Is used, the wire 1 is extracted from the fixing jig B and the drawn-out portion 31 cut into a cylindrical shape, the cut-off drawn portion 31 is detached from the wire 1, and then the wire 1 is inserted into the fixing jig B. This is because it is necessary to reinsert and lock the end of the buried pipe, and it takes time to insert and remove the wire 1 to and from the fixing jig B and the drawn-out portion 31 cut into a cylindrical shape. The present invention has been made in view of the above circumstances, and grasps one end of a buried pipe, pulls out a part of the buried pipe into a pit, cuts the drawn portion into a cylindrical shape, and then re-embeds the buried pipe. An object of the present invention is to efficiently pull out a buried pipe when the buried pipe to be removed is pulled out over the entire length by repeating an operation of gripping an end portion and pulling out a part thereof.

[0004]

According to a first feature of the present invention, in order to tighten a buried pipe to be removed in the longitudinal direction of the pipe, a cord inserted through the entire length of the buried pipe is tensioned. A cord fixing jig for fixing to a buried pipe end in a state,
A reaction force receiving member that can be engaged with the end of the buried pipe from the longitudinal direction of the pipe while the cord is inserted over the entire length of the buried pipe, and a fitting portion formed on the reaction force receiving member. A wedge member that can be fitted in the pipe longitudinal direction from the outside of the buried pipe, and the fitting portion is provided on the fitting surface so that the cable body can be attached and detached from the cable body radial direction, and the reaction force A receiving member is locked to the end of the buried pipe, and the cord is sandwiched between a fitting surface of the fitting portion and a wedge surface of the wedge member, and the cord is embedded in a tensioned state. The point is that it is configured to be locked and fixed to the pipe end. [Operation] When the cord is locked and fixed to the end of the buried pipe in a tensioned state, the reaction force receiving member is attached to the end of the buried pipe while the cord is inserted through the entire length of the buried pipe to be removed. The tensioned cord is attached from the pipe longitudinal direction to the fitting surface of the fitting part formed on the reaction force receiving member, and the wedge member is embedded in the fitting part. By fitting in the longitudinal direction of the pipe from the outside of the pipe, the cord is sandwiched between the fitting surface of the fitting portion and the wedge surface of the wedge member, and the cord is tightened to embed the pipe end. Lock and fix to. Then, as the one end of the buried pipe is gripped and pulled, the joint part having a small retaining force is loosened and the buried pipe tries to expand, and the reaction force receiving member locked to the end of the buried pipe. The wedge member and the wedge member relatively move so as to push the wedge member into the fitting portion, and the pinching force of the cord by the fitting portion and the wedge member increases. Further, when the reaction force receiving member and the wedge member that lock and fix the cord are removed from the end of the buried pipe, the fitting of the wedge member to the fitting portion is released, and the cord is fitted. The reaction force receiving member and the wedge member are removed from the buried pipe end so as to escape from the joint portion in the cable body radial direction. [Effect] Even when the cord is locked and fixed to the end of the buried pipe in a tensioned state or when the cord is unlocked, the cord is attached to and detached from the cord in the radial direction of the cord. A traction device that grips and pulls the end of the buried pipe is installed in a pit provided on the lower side in the drawing direction of the buried pipe, and the traction device grips one end of the buried pipe and buries it. By pulling out a part of the pipe into the pit, cutting the drawn out part into a tube, and then again grasping the end of the buried pipe and pulling out part of it, the burial to be removed When pulling out the pipe over the entire length, without pulling the wire into and out of the fixing jig or the drawn part cut into a tube,
The fixing jig can be re-locked to the end of the buried pipe after cutting the drawn part, and the buried pipe can be efficiently pulled out. In addition, as the end of the buried pipe is gripped and pulled, the joint portion having a small retaining force is loosened and the buried pipe tries to expand, and the fitting surface of the fitting portion and the wedge surface of the wedge member are removed. Since the pinching force of the cable body by the cable body increases, when the cable body is locked and fixed to the buried pipe end in a tensioned state, the cable body is fitted with a small operating force with a small pinching force of the cable body. It is easy to fix so that the cord is not loosened while easily sandwiching it between the wire and the wedge surface.

According to a second aspect of the present invention, the wedge member is configured such that the cord can be detachably attached to the wedge member in a radial direction of the cord, and the cord is attached to the fitting surface and the wedge surface. And a fixing tool for pinching and fixing the cord portion sandwiched between them. [Action] The wedge member can be attached to and detached from the cord body in the radial direction of the cord even when the cord body is locked and fixed to the end of the buried pipe in a tensioned state or when the cord body is removed from the cord body. While the rope is sandwiched between the fitting surface and the wedge surface so as to be bent with respect to the rope portion, the relative movement of the rope and the wedge member along the pipe longitudinal direction is prevented. It can be fixed so that a large resistance acts. [Effect] When the cord is sandwiched between the fitting surface of the fitting portion and the wedge surface of the wedge member, and the cord is locked and fixed to the end of the buried pipe in a tensioned state, It is difficult for the wedge member and the wedge member to relatively move in the longitudinal direction of the pipe, and the cord is not easily loosened.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. In the drawings, portions denoted by the same reference numerals as those of the conventional example indicate the same or corresponding portions. 1 to 3 show a steel wire (an example of a cord) inserted through the entire length of the buried pipe A in order to tighten the steel buried pipe A for city gas supply to be removed in the pipe longitudinal direction. 1 is a stainless steel cord fixing jig (hereinafter simply referred to as a fixing jig) according to the present invention for fixing 1 to the buried pipe end in a tensioned state.
B. FIGS. 4 to 7 show the fixing jig B using FIGS.
This figure shows a buried pipe drawing method in which one end of a buried pipe A to be removed is gripped and pulled out from the ground.

As shown in FIGS. 1 and 2, the fixing jig B has a wire 1 inserted through the entire length of the buried pipe A, and can be locked at the end of the buried pipe in the longitudinal direction of the pipe. It has a force receiving member 2 and a wedge member 3 which can be fitted in a fitting portion 4 formed on the reaction force receiving member 2 from the outside of the buried pipe A in the pipe longitudinal direction.

The reaction force receiving member 2 is formed by integrally fixing a cap member 5 fitted externally to the end of the buried pipe A and a fitting member 6 forming a fitting portion 4 by welding. A notch 7 through which the wire 1 can be inserted from the wire diameter direction is provided so that the cap member 5 can be fitted to the end of the embedded tube A in a state where the wire 1 is inserted through the entire length of the embedded tube A. It is provided on the cap member 5.

The fitting portion 4 has a first fitting surface 8 having an arc-shaped cross section that sandwiches the wire 1 between the wire 1 and the wedge member 3, and a second fitting surface 9 with which the wedge member 3 directly contacts. And a wire insertion groove 10 communicating with the notch 7 so that the wire 1 inserted through the notch 7 has a wire diameter on the first fitting surface 8. The first fitting surface 8 is provided with a plurality of ridges which can bite into the wire 1 in a circular arc shape.
Is provided.

The wedge member 3 includes a first wedge surface 12 having a circular cross section and sandwiching the wire 1 between the first wedge surface 12 and the first fitting surface 8.
It is formed in a substantially V-shape having a second wedge surface 13 that contacts the second fitting surface 9, and a large number of ridges that can bite into the wire 1 are also formed on the first wedge surface 12 in an arc shape. The formed wire locking portion 14 is provided.

Also, at the rear end side of the first wedge surface 12 in the fitting direction,
The cross section inclined with respect to the first wedge surface 12 forms an inclined surface 15 having an arc shape, and the wire 1 is detachable from the inclined surface 15 in a wire radial direction, and the wire 1 is connected to the first wedge surface 12. A fixture 17 is provided to be clamped and fixed to the inclined surface 15 so as to bend with respect to the wire portion 16 sandwiched between the first fitting surface 8 and the first wedge surface 12.

As shown in FIG. 3, the fixing member 17 holds the wire 1 between the inclined surface 15 and the holding member 19 having a circular arc-shaped holding surface 18 for holding the wire 1 therebetween. The wedge member 3 is slidably supported between a holding position to be attached and a holding release position for releasing the holding, and the arm 20 is extended to the holding member 19 to hold the wedge member 3 therebetween. A bolt 21 operable to be screwed in a direction opposite to the slide movement direction with respect to 18 is screwed to the arm 20, and the screwing operation of the bolt 21 slides the holding member 19 between a holding position and a holding release position. It is provided movably.

A method of drawing a buried pipe by using the fixing jig B to hold one end of the buried pipe A to be removed and pull it out of the ground will be described with reference to FIGS. FIG.
As shown in (a), brazing pipe joint (socket pipe joint)
The two ends of the buried pipe A to be removed, in which the joint portion 22 having a small retaining force is used, are exposed in the pits 23a and 23b. One end of the buried pipe A is fixed to a cap 24 or the like externally fitted to one end of the buried pipe A, and the other end of the buried pipe A is pulled by a towing device C. It is installed in the pit 23a.

As shown in FIG. 6, the traction device C includes a pair of left and right hydraulic cylinders 25 arranged in parallel with each other and a connecting portion 26 connecting the rods of the hydraulic cylinders 25 to each other. A pulling rod 27 supported so as to be able to swing up and down along the direction of expansion and contraction of 25;
A tube gripper 28 supported at the tip of the tow rod 27 so as to be vertically swingable along the direction of expansion and contraction of the hydraulic cylinder 25.
And

[0015] As shown in FIG.
The upper locking piece 29 that locks on the upper surface side of the buried pipe A and the lower locking piece 30 that locks on the lower surface side of the buried pipe A are vertically moved at a wider interval than the outer diameter of the buried pipe A. It is formed in a substantially U-shape in a front view, and in a state where the buried pipe A is inserted between the upper locking piece 29 and the lower locking piece 30, it is tilted to the upper side in the towing direction, The buried pipe A can be gripped by locking the upper locking piece 29 and the lower locking piece 30 from above and below on the outer peripheral surface of the buried pipe A.

Then, in a state where the hydraulic cylinder 25 is contracted, one end of the buried pipe A is gripped by the pipe gripper 28, and then the traction rod 27 is moved by the extension operation of the hydraulic cylinder 25, whereby the buried pipe is moved. A is pulled out of the ground by the extension stroke of the hydraulic cylinder 25, the pipe gripper 28 is lifted to release the gripping of the buried pipe A, and then the hydraulic cylinder 25 is contracted and embedded again with the pipe gripper 28. The operation of grasping the pipe A is repeated, and the buried pipe A is
It can be pulled out little by little into a.

Next, as shown in FIG. 4B, the wire 1 is inserted into the notch 7, the cap member 5 is fitted over the other end of the buried pipe A, and the reaction force receiving member 2 is connected. The wire 1 is connected to the tube gripper 28 of the traction device C through the wire insertion groove 10 and the fitting portion 4 while being locked at the end of the buried pipe. The wire 1 is pulled and tensioned by the extension operation.

Next, the wedge member 3 is pushed into the fitting portion 4 while the wire 1 is inserted between the holding surface 18 of the holding member 19 held at the holding release position and the inclined surface 15 of the wedge member 3. Then, the wire 1 is sandwiched between the first fitting surface 8 and the first wedge surface 12, and the bolt 21 of the fixing tool 17 is screwed toward the wedge member 3 side, as shown in FIGS. Then, the wire 1 is clamped and fixed to the wedge member 3, the pulling of the wire 1 by the traction device C is released, and the wire 1 is removed from the tube gripper 28.

Next, as shown in FIG. 5 (c), one end of the buried pipe A is gripped by the pipe gripper 28, and is inserted into the pit 23a of the buried pipe A as shown in FIG. 5 (d). Extraction part 3 of
1 is pulled so that the length of the wire 1 becomes a predetermined length, and the cut-out portion 31 is cut. Then, the fixing of the wire 1 to the wedge member 3 by the fixture 17 is released, and the wedge member 3 is connected to the fitting portion 4. 5, the wire 1 is loosened, the fixing jig B is detached from the withdrawn portion 31, and the embedded jig is cut using the fixing jig B as shown in FIG. The wire 1 is fixed again to the end of A under tension, and the above operation is repeated until the buried pipe A is pulled out into the pit 23a over the entire length.

[Other Embodiments] In the cord fixing jig according to the present invention, when a buried pipe has a corroded portion or a broken portion in the middle thereof, and when one end of the buried pipe is gripped and pulled out, the buried pipe is torn off at that location and cut off. When there is a risk of being buried, the buried pipe may be used to tighten the pipe in the pipe longitudinal direction. 2. The cord fixing jig according to the present invention may be used for fastening a buried pipe made of resin such as polyethylene resin or cast iron in the pipe longitudinal direction. 3. The cord fixing jig according to the present invention may be used to tighten a buried pipe for water supply or sewerage in the pipe longitudinal direction.

[Brief description of the drawings]

FIG. 1 is a perspective view of a cord fixing jig.

FIG. 2 is a sectional side view of a main part.

FIG. 3 is a partially cutaway front view of a main part.

FIG. 4 is an explanatory view of a buried pipe drawing method.

FIG. 5 is an explanatory view of a buried pipe drawing method.

FIG. 6 is a perspective view of a traction device.

FIG. 7 is a side view of a main part.

FIG. 8 is an explanatory diagram of a conventional technique.

FIG. 9 is an explanatory diagram of a conventional technique.

[Explanation of symbols]

 A buried pipe 1 cord body 2 reaction force receiving member 3 wedge member 4 fitting part 8 fitting surface 12 wedge face 16 cord body part 17 fixture

Claims (2)

[Claims] 1. A cord fixing jig for fixing a cord inserted through the entire length of a buried pipe to an end of the buried pipe in a tensioned state in order to tighten the buried pipe to be removed in the pipe longitudinal direction. A reaction force receiving member that can be locked to the end of the buried pipe from the longitudinal direction of the pipe, and the reaction force receiving member is formed in a state where the cord is inserted through the entire length of the buried pipe. A wedge member that can be fitted in the longitudinal direction of the pipe from the outside of the buried pipe at the fitting portion, and the fitting portion is provided on the fitting surface so as to be detachable from the wire body radial direction. While the reaction force receiving member is locked to the end of the buried pipe, the cable body is sandwiched between the fitting surface of the fitting portion and the wedge surface of the wedge member, and the cable body is A cord fixing jig configured to be locked and fixed to an end of a buried pipe in a tensioned state. 2. A rope body in which the rope body is detachably mounted on the wedge member in a radial direction of the rope body, and the rope body is sandwiched between the fitting surface and the wedge surface. 2. The cord fixing jig according to claim 1, further comprising: a fixing member which is sandwiched and fixed so as to bend with respect to the portion.