JP4603729B2 - Jig for extracting buried pipe - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to pulling out a buried pipe capable of holding the buried pipe and the strip body integrally by engaging a cable body inserted through the entire length of the buried pipe to be removed with both ends of the buried pipe. It relates to a jig.
[0002]
[Prior art]
In the buried pipe drawing method that grips the end of the buried pipe to be removed and pulls it out of the ground, a joint that uses a seal brazing pipe joint (socket pipe joint) etc. in the middle of the buried pipe has a small retaining prevention force If there is a portion, if the end of the buried pipe is grasped and pulled out, the joint portion is detached and the buried pipe is divided in the ground, and the buried pipe may not be pulled out over the entire length.
[0003]
In the buried pipe drawing method, the buried pipe pulling jig is embedded even if the joint part with a little retaining force is loosened or detached as the end of the buried pipe is gripped and pulled out. The stubbed body inserted through the entire length of the buried pipe to be removed can be engaged with both ends of the buried pipe so that the pipe is pulled out over the entire length, and the buried pipe and the striated body can be held integrally. It is what I did.
[0004]
In the conventional buried pipe drawing jig, as shown in FIG. 6 (a), the pulling reaction force of the wire (an example of the rope) 1 can be received and the end of the buried pipe A can be pressed from the longitudinal direction of the pipe. An engagement fitting 2 provided with a cylindrical pressure contact member 3 and inserted through the entire length of the buried pipe A to be removed and connected to one end side of the wire 1 as shown in FIG. Is engaged with one end portion of the buried pipe A, the other end side is inserted into the press contact member 3, and the press contact member 3 is fastened and fixed to the wire 1 with a screw 23, thereby fixing the other end side of the wire 1. The wire 1 is engaged with both ends of the buried pipe A by being engaged with the other end of the installed pipe A by the pressure contact member 3.
[0005]
[Problems to be solved by the invention]
For this reason, as shown in FIG. 7 (a), a traction device D that grips and pulls the end of the buried pipe A is installed in the pit 14 and the traction device D grips the end of the buried pipe A. Then, a part of the buried pipe A is pulled out into the pit 14 and the pulled-out portion 22 is cut into a cylindrical shape and removed, and then the pressure contact member 3 is fixed to the wire 1 as shown in FIG. Reworking, engaging the pressure contact member 3 with the end of the buried pipe A after cutting, re-gripping the end of the buried pipe A with the traction device D, and pulling out a part thereof with the traction device D If the buried pipe A to be removed is pulled out over the entire length by repeating the above, there is a disadvantage that it takes time to insert and remove the wire 1 into and from the pressure contact member 3, and the buried pipe A cannot be pulled out efficiently.
[0006]
That is, in order to repeat the operation of grasping the end portion of the buried pipe A and pulling out a part thereof, the press contact member 3 is engaged with the end portion of the buried pipe A after cutting the drawn portion 22 each time it is repeated. Although it is necessary to correct, since the cylindrical pressure contact member 3 is used, each time a part of the buried pipe A is pulled out, the wire 1 is pulled out from the pressure contact member 3 and the drawn portion 22 cut into a cylindrical shape, This is because it is necessary to reinsert the wire 1 into the pressure contact member 3 and engage the pressure contact member 3 with the end portion of the buried pipe A.
[0007]
The present invention has been made in view of the above circumstances, and grips the end portion of the buried pipe, pulls out a part thereof, cuts the drawn portion into a cylindrical shape, and then cuts the buried pipe. The object of the present invention is to efficiently pull out the buried pipe when the buried pipe to be removed is pulled out over the entire length by repeating the operation of gripping and removing a part thereof.
[0008]
[Means for Solving the Problems]
The characteristic configuration of the invention described in claim 1 is that the cable body inserted through the entire length of the buried pipe to be removed is engaged with both ends of the buried pipe, and the buried pipe and the cable body are integrated. A buried pipe pulling jig that can be held in a pressure contact member that receives a tensile reaction force of the strip body and can be pressed against an end portion of the buried pipe from the longitudinal direction of the pipe, and the pressure contact member is connected to the strip. A mounting portion that can be attached to and detached from the rod radial direction with respect to the body, and configured to be able to engage with the end portion of the buried pipe with the pressing member attached to the mounting portion, There exists in the point which provided the mounting part in multiple places along the longitudinal direction of the said strip.
[0009]
[Action]
The strip is provided with a plurality of mounting portions along the longitudinal direction of the strip body, and mounting portions that can be attached to and detached from the strip body radial direction with respect to the strip body. With the side engaged with one end of the buried pipe, the striated body is inserted through the buried pipe over the entire length of the buried pipe to be removed so that at least one mounting part is pulled out from the other end of the buried pipe. Then, the other end side of the cable body is engaged with the other end part of the buried pipe with the pressure contact member attached to the pulled-out attachment part from the radial direction of the cable body, and the end part of the buried pipe is gripped and pulled out. Along with this, even if the joint portion having a small retaining prevention force is loosened or detached, the cable body is engaged with both ends of the buried pipe so that the buried pipe is pulled out over the entire length.
[0010]
And after grasping the end of the buried pipe with a traction device and pulling out a part of the buried pipe, the pressure contact member is removed from the attachment portion in the radial direction of the cable body, and the drawn portion is cut into a cylindrical shape. In order to engage the end of the buried pipe after cutting, the pressure contact member is remounted from the radial direction of the cable body to the mounting portion pulled out from the end of the buried pipe after cutting. By embedding the strips at both ends of the buried pipe, and repeatedly holding the cut end of the buried pipe with the traction device and pulling out part of it, the burial to be removed The tube can be withdrawn over its entire length.
[0011]
〔effect〕
Grasping the end of the buried pipe and pulling out a part of it, cutting the pulled-out part into a cylindrical shape, then gripping the end of the buried pipe again and pulling out a part of it When the buried pipe to be removed is pulled out over the entire length by repeating, each time a part of the buried pipe is pulled out as in the past, the pressure contact member is inserted into the attachment portion without inserting or removing the wire from the pressure contact member. By detaching from the body diameter direction, the wire can be engaged with both ends of the buried pipe, the buried pipe and the cable body can be held integrally, and the buried pipe can be pulled out efficiently.
[0012]
According to a second aspect of the present invention, the pressure contact member is a rod-shaped body, and an annular portion that can be inserted / removed from the radial direction of the cable body is provided on the cable body to configure the mounting portion. It is in a certain point.
[0013]
[Action]
With the one end side of the striated body engaged with one end part of the buried pipe, the striated body covers the entire length of the buried pipe to be removed so that at least one annular part is pulled out from the other end part of the buried pipe. The rod-like body (pressure contact member) inserted through the buried pipe from the radial direction of the pulled-out annular part is engaged with the other end of the buried pipe with the other end of the buried pipe. Engage the body with both ends of the buried tube.
[0014]
Then, after gripping the end of the buried pipe with a traction device and pulling out a part of the buried pipe, the rod-like body (pressure contact member) is pulled out from the annular portion in the radial direction of the striated body, and the drawn-out portion of the buried pipe Is cut into a cylindrical shape, and the rod-shaped body (pressure contact member) is engaged with the annular portion drawn from the end of the buried pipe so that the rod-shaped body (pressure contact member) engages with the end of the buried pipe after cutting. The member can be reinserted from the radial direction of the cable body, and the cable body can be engaged with both ends of the buried pipe.
[0015]
〔effect〕
Since the rod-like body (pressure contact member) can be inserted into and removed from the annular portion and the cable body can be engaged with or released from the end of the buried pipe, workability can be improved.
[0016]
According to a third aspect of the present invention, a plurality of cord-like members arranged side by side are integrally connected to each other at a plurality of locations in the longitudinal direction to form the striated body, and the plurality of the plurality of cord-shaped members are arranged between the connecting portions. The cord-like members are connected to each other to form the annular portion.
[0017]
[Action]
A plurality of cord-like members arranged side by side are integrally connected at a plurality of locations in the longitudinal direction, and an annular portion in which the plurality of cord-like members are connected to each other is formed between the connecting portions. The tensile reaction force of the member can be transmitted directly to the rod-like body (pressure contact member).
[0018]
〔effect〕
Since the tensile reaction force of the cord-like member can be directly transmitted to the rod-like body (pressure contact member), for example, a plurality of annular members are separately manufactured, and these annular members are arranged at a plurality of locations along the longitudinal direction of the rope-like member. It is easier to ensure the strength of the annular part and provide the annular part more easily than when connecting and transmitting the pulling reaction force of the cord-like member to the rod-like body (pressure contact member) via the annular member This simplifies the structure and reduces the weight.
[0019]
According to a fourth aspect of the present invention, the pressure contact member is formed of a taper pin that is longer than the outer diameter of the end portion of the buried pipe.
[0020]
[Action]
When a part of the buried pipe is pulled out and the rod-shaped body (pressure contact member) inserted through the annular part is pressed against the end of the buried pipe with a strong pressure, the rod-shaped body has the same diameter over the entire length. In the case of (pressure contact member), until the rod-like body (pressure contact member) comes out of the annular portion, the strong pressure-contact force continues to act and it is difficult to pull out the rod-like body (pressure contact member) from the annular portion. Since the body (pressure contact member) is composed of a taper pin that is longer than the outer diameter of the end of the buried pipe, the pressure contact force can be reduced by moving the rod-shaped body (pressure contact member) out of the annular portion.
[0021]
〔effect〕
When a part of the buried pipe is pulled out, the rod-like body (pressure contact member) inserted into the annular part is pressed against the end of the buried pipe with a strong pressure. Can be easily extracted from
[0022]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings. In the drawings, the parts indicated by the same reference numerals as those in the conventional example indicate the same or corresponding parts.
FIG. 1 shows a wire (an example of a striated body) 1 inserted through the entire length of a steel gas supply pipe A for supply of city gas to be removed. FIG. 2 and FIG. 3 show the end of the buried pipe A to be removed using the drawing jig B, which can hold the wire 1 integrally. It shows the buried pipe drawing method to pull out from the ground.
[0023]
As shown in FIG. 1 (a), the drawing jig B includes a wire 1 in which an engagement fitting 2 to be engaged with one end of the buried pipe A is connected to one end, and a pulling reaction force of the wire 1 The pressure contact member 3 capable of receiving and pressure-contacting the end of the buried pipe A from the longitudinal direction of the pipe, and a plurality of mounting portions 4 capable of attaching and detaching the pressure contact member 3 to the wire 1 from the radial direction of the striated body are provided. The wire 1 can be engaged with the other end of the buried pipe A by the pressure contact member 3 attached to any of the attachment portions 4.
[0024]
The pressure contact member 3 is composed of a steel taper pin (an example of a rod-like body) that is longer than the outer diameter of the end portion of the buried pipe A, and the wire 1 is a single small-diameter wire (an example of a strip member). Are bent at the center, and the free ends and intermediate portions of the two small-diameter wires 5 arranged substantially parallel to each other are separated by a plurality of caulking hardware 6 at a substantially constant interval (about 150 mm in this embodiment). Are connected to each other.
[0025]
Then, between the connecting portions of the small diameter wires 5, an annular portion 7 in which the two small diameter wires 5 are connected to each other is formed, and the mounting portion 4 that can be inserted and removed from the taper pin 3 into the annular portion 7 from the wire radial direction, A plurality of locations are provided along the longitudinal direction of the wire 1.
[0026]
As shown in FIG. 1 (b), the engagement fitting 2 is provided with an inner fitting portion 8 fitted into one end portion of the buried pipe A on one end side, and is formed across the inner fitting portion 8 and the fitting body 9. The one end side of the wire 1 is inserted into the groove 10 and the bolt 11 screwed and fixed to the metal fitting body 9 is inserted between the small diameter wires 5 so that the engagement metal fitting 2 is connected to one end side of the wire 1. An eye bolt 12 for connecting a new pipe C described later is fixed to the other end side.
[0027]
Using the extraction jig B, while holding the end of the buried pipe A to be removed and drawing it from the ground, a buried pipe drawing method for drawing a new pipe C made of resin such as polyethylene into the drawn trace, This will be described with reference to FIGS.
[0028]
As shown in Fig. 2 (a), both ends of the buried pipe A to be removed, which has a joint part 13 with a small retaining prevention force using a seal brazing pipe joint (socket pipe joint), etc., in the middle are pits. 14a and 14b, the wire 1 is inserted through the entire length of the buried pipe A from one pit 14a with a wire or the like, and the fitting portion 8 of the engagement fitting 2 connected to one end thereof is exposed. Is inserted into one end of the buried pipe A, and one end of the wire 1 is engaged with one end of the buried pipe A by the fitting 2, and a new pipe C to be drawn into the withdrawal trace of the buried pipe A is connected. A traction device D is connected to the eyebolt 12 of the engagement metal fitting 2 via the metal fitting 15 so as to be relatively rotatable, and a traction device D that grips and pulls the other end of the buried pipe A is installed in the other pit 14b.
[0029]
As shown in FIG. 4, the traction device D includes a pair of left and right hydraulic cylinders 16 fixed in parallel with each other and a connecting portion 17 that connects rods of the hydraulic cylinders 16 to extend and contract the hydraulic cylinders 16. A pulling rod 18 supported so as to be swingable up and down along the direction, and a tube gripper 19 supported at the tip of the pulling rod 18 so as to be swingable up and down along the extending and contracting direction of the hydraulic cylinder 16. I have.
[0030]
As shown in FIG. 5, the tube gripping tool 19 embeds an upper locking piece 20 locked on the upper surface side of the buried pipe A and a lower locking piece 21 locked on the lower surface side of the buried pipe A. The pipe A is provided above and below at an interval wider than the outer diameter of the pipe A, and is formed in a substantially U shape in front view. The buried pipe A is provided between the upper locking piece 20 and the lower locking piece 21. In this state, the buried pipe A can be gripped by tilting the upper locking piece 20 and the lower locking piece 21 to the outer peripheral surface of the buried pipe A from above and below by tilting toward the upper side in the pulling direction. It is.
[0031]
Then, in a state where the hydraulic cylinder 16 is contracted, the end of the buried pipe A is gripped by the pipe gripping tool 19, and then the traction rod 18 is moved by the extension operation of the hydraulic cylinder 16, whereby the buried pipe A is hydraulically operated. The cylinder 16 is pulled out from the ground by the extension stroke, and the pipe gripping tool 19 is lifted to release the gripping of the buried pipe A. Then, the hydraulic cylinder 16 is contracted, and the pipe gripping tool 19 is used again to bury the buried pipe A. By repeating the gripping operation, the buried pipe A is gradually pulled out into the pit 14b.
[0032]
Next, as shown in FIG. 2 (b), the end of the wire 1 is pulled by hand, the taper pin 3 is inserted into the annular portion 7 drawn from the embedded tube A, and the taper pin 3 is connected to the other end of the embedded tube A. The other end of the wire 1 is engaged with the other end of the buried tube A, and the buried tube A and the wire 1 are held together.
[0033]
Next, as shown in FIG. 3 (c), the end of the buried pipe A is grasped by the pipe gripping tool 19, and the new pipe C is placed on the trace of the buried pipe A as shown in FIG. 3 (d). While pulling, the pulling portion 22 into the pit 14b of the buried pipe A is pulled so that the length becomes a predetermined length, and the end of the small diameter side of the taper pin 3 is hit with a hammer or the like in the pulling out direction. While pulling out from the annular portion 7 in the wire radial direction, the pull-out portion 22 is cut into a cylindrical shape, and the cut-out pull-out portion 22 is extracted from the wire 1 and removed from the pit 14b.
[0034]
Next, by pulling the wire 1 drawn from the end of the buried tube A after cutting, the taper pin 3 is inserted into the annular portion 7 drawn from the buried tube A in the same manner as described above, and the other end of the wire 1 is inserted. The above operation is performed until the side is engaged with the other end of the buried pipe A after cutting, the buried pipe A is pulled out into the pit 14b over the entire length, and the new pipe C is drawn over the entire length of the withdrawal trace. repeat.
[0035]
[Other Embodiments]
1. The buried pipe pulling jig according to the present invention may use a chain such as a pin coupling chain or a coil coupling chain as the rope body so that the pressure contact member can be attached to and detached from the chain in the radial direction of the chain. .
2. The embedded pipe drawing jig according to the present invention may be provided with a mounting portion for detachably locking the pressure contact member with respect to the rope body from the radial direction of the rope body.
3. The buried pipe pulling jig according to the present invention can select the material of the rope body, or connect an elastic body such as a coil spring to the middle portion of the rope body, thereby making the rope body elastic at a certain limit. Pull out the mounting part from the buried pipe by pulling the other side of the cable body while elastically extending in a state where one end side of the cable body is engaged with one end part of the buried pipe. The pressure contact member is attached to the pulled-out attachment portion, the pressure contact member is pressed against the other end portion of the buried pipe by the elastic restoring force of the rope body, and the other end side of the rope body is brought to the other end portion of the buried pipe. You may comprise so that it may engage.
4). The buried pipe pulling jig according to the present invention is provided with a temporary stopper that can be temporarily fixed at the end of the buried pipe or an adsorbing tool that can be adsorbed by magnetic force at the end of the buried pipe, and particularly pulls the wire. Without temporarily attaching or adsorbing the pressure contact member attached to the attachment part to the end of the buried pipe, as the buried pipe is pulled out, the joint part with a small retaining prevention force loosens or comes off, When a pulling force is generated in the rope body, the pulling reaction force may be received by a pressure contact member so that the rope body is engaged with the end portion of the buried pipe.
5). The buried pipe pulling jig according to the present invention has a corroded part or a broken part in the middle of the buried pipe, and when the end of the buried pipe is gripped and pulled, the buried pipe is broken at that part and divided. It may be used when there is a risk of being lost.
6). The buried pipe drawing jig according to the present invention may be used for drawing a buried pipe made of resin such as polyethylene resin or cast iron.
7). The buried pipe pulling jig according to the present invention may be used to pull out a buried pipe for water supply or sewerage, or a buried pipe for burying a power cable or a communication cable in the ground.
[Brief description of the drawings]
[Fig. 1] Fig. 1 shows a buried pipe drawing jig, (A) is a partially omitted perspective view, (B) is a side view of the main part. [Fig. 2] An explanatory diagram of the buried pipe drawing method. [Fig. Fig. 4 is a perspective view of the traction device. Fig. 5 is a side view of the main portion of the traction device. Fig. 6 is an illustration of the prior art. Fig. 7 is an illustration of the prior art.
1 Strip 3 Pressure member (taper pin)
4 Mounting part 5 Cord-like member 7 Annular part A Buried pipe

Claims (4)

A buried pipe extraction jig that can hold the buried pipe and the cable body integrally by engaging the cable body inserted through the entire length of the buried pipe to be removed with both ends of the buried pipe. There,
A pressure contact member capable of receiving a tensile reaction force of the cable body and press-contacting the end of the buried pipe from the longitudinal direction of the pipe, and the pressure contact member can be attached to and detached from the cable body in the radial direction of the cable body A mounting portion, and configured so that the cable body can be engaged with an end portion of the buried pipe with a pressure contact member mounted on the mounting portion;
A buried pipe extraction jig in which the mounting portion is provided at a plurality of locations along the longitudinal direction of the cable body. 2. The buried pipe pullout according to claim 1, wherein the pressure contact member is a rod-like body, and an annular portion in which the pressure contact member can be inserted / removed from the radial direction of the cable body is provided on the cable body to constitute the mounting part. Jig. A plurality of cord-like members arranged side by side are integrally connected at a plurality of locations in the longitudinal direction to form the cord body, and the plurality of cord-like members are connected to each other between the connecting portions. The buried pipe drawing jig according to claim 2, wherein a portion is formed. The buried pipe drawing jig according to claim 2 or 3, wherein the pressure contact member is constituted by a taper pin longer than an outer diameter of an end portion of the buried pipe.

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