JP2550424B2 - Underground cable removal device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an underground cable removing device capable of continuously extracting a cable for telecommunications stored in an underground conduit.

[Prior Art] Conventionally, various methods listed below are known as a removal machine and a construction method for pulling out a cable for telecommunication stored in an underground pipe.

Method using a wire tensioner Usually, this is a method of pulling a cable by using a pulling bolt for traction embedded in a manhole by a wire tensioner used for adjusting the tension of a cable suspension line and a utility pole branch line. At this time, the cable is generally gripped by attaching a mesh grip knitted with wire strands or winding it with a wire.

Method by winch By using the power winch installed on the ground, the cable in the manhole is grasped and pulled by the method described in the above section, and the pulleys are installed at the required places of the manhole to facilitate the pulling of the cable to the ground. .

Method using underground cable remover Insert the tip of the remover into the cable entrance / exit of the underground pipeline that houses the cable to be removed (hereinafter referred to as the duct port) in the manhole, and chain the rear of the remover. After tightening with the pooling bolt of the manhole, attach the net grip dedicated to the removal machine to the cable and set it on the removal machine. The cable is pulled out by the two hydraulic cylinder jacks, but the cable is gripped by the expansion and contraction of the dedicated net grip that follows the movement of the hydraulic jack.

Method using cable laying / removal vehicle The method is to pull by a special vehicle equipped with a special removal drum that has the function equivalent to the power winch described in the above section, and the cable is gripped by attaching the net grip described in the above section.

 The above is the technique generally implemented.

[Problems to be Solved by the Invention] However, all of the above-described conventional techniques have traction capabilities.
It is about 3t, and the capacity is insufficient for the pull-out resistance force of the cable that has increased due to aging in the underground pipeline,
Sometimes I had to give up the cable removal work.

Further, in the above-described conventional net grip and wire winding, a sufficient gripping force commensurate with the traction force cannot be obtained, and there is a problem in strength.

Therefore, the present invention has been made in view of the conventional problems as described above, and an object thereof is to provide a cable for telecommunication which is difficult to pull out by a normal method accommodated in an underground pipeline. It is possible to pull the cable to the breaking strength of the cable, and because it can not be pulled out until now, it is possible to reliably remove the residual cable left in the pipeline, so that the existing underground pipeline can be effectively used The purpose is to provide an underground cable removal device.

[Means for Solving the Problems] The present invention has been made to achieve the above object,
The present invention is a device for gripping, pulling and removing a communication cable housed in an underground conduit from the manhole, wherein the communication cable is gripped at the front part of the device and the gripped state is released at the rear part of the device. The clamp mechanism includes a clamp mechanism, a pair of hydraulic cylinder jacks for clamping that operate the clamp mechanism, and a hydraulic cylinder jack for traction that moves the gripped communication cable together with the clamp mechanism toward the rear of the device. The surface is formed in a sinusoidal waveform and is composed of a pair of openable and closable clamps connected to each clamp hydraulic cylinder jack by a connecting pin, and the pulling hydraulic cylinder jack continuously reciprocates the clamp mechanism. It is characterized by removing the communication cable.

[Operation] In the present invention, the clamp grips the communication cable in the front part of the device, is moved to the rear part of the device by the hydraulic cylinder jack for traction to release the gripped state, and then is returned to the front part of the device to grip the cable again, By repeating this series of operations, the cable is continuously pulled out from the underground conduit. The clamp has a waveform-shaped cable gripping surface and compresses and grips the cable from the side direction.

[Examples] Hereinafter, the present invention will be described in detail based on Examples shown in the drawings.

FIG. 1 is a side view of an embodiment of an underground cable removing device according to the present invention during a cable removing operation, FIG. 2 is a rear view of the same, and FIG. 3 is a cable removing device main body shown in FIG.
-III line sectional view, FIG. 4 is a front view of the same apparatus main body, FIG. 5 is a rear view of the same apparatus main body, FIG. 6 is FIG.
-VI sectional drawing, FIG. 7 is a perspective view of a clamp.

In FIG. 1 and FIG. 2, 1 is a manhole constructed underground, 2 is an underground pipe buried underground, and a duct port 3 of this underground pipe 2 is opened on one inner wall surface of the manhole 1. ing. Reference numeral 4 is a communication cable housed in the underground conduit 2, 5 is an underground cable removing device that is inserted and arranged in the manhole 1 and pulls out the communication cable 4, and 6 is an H steel material for reaction force that transmits the pulling force to the manhole 1.

The underground cable removing device 5 includes a wheel 10, a gantry 12 having an outrigger 11, and a cable removing device main body 13 installed on the gantry 12. As shown in FIGS. 1 to 6, the cable removing device main body 13 has an outer frame body 15 which has wheels 14 and which is installed on the mount 12 so as to be movable back and forth.
And a movable body disposed inside the outer frame body 15 so as to be movable back and forth.
16 and the outer frame 15 includes a pair of left and right hydraulic cylinder jacks for towing (hereinafter referred to as towing jacks) 17A, 1
7B is arranged with the cylinder front end a (Fig. 3) fixed,
The piston outer end b is connected to the movable body 15. In addition, a cable insertion hole 18A and a guide hole 18B are provided in the center of the front and rear surfaces of the outer frame body 15, respectively.

A clamp mechanism 19 for gripping the communication cable 4 and a pair of hydraulic cylinder jacks for clamping (hereinafter, referred to as clamp jacks) 20A that are vertically opposed to each other and operate the clamp mechanism 19 inside the movable body 16. 20B is provided. The clamp mechanism 19 includes a pair of clamps 21 that face each other vertically and grip the communication cable 4, as shown in FIG.
It is composed of A and 21B and a pair of upper and lower rotating arms 22A and 22B holding the clamps 21A and 21B. Each rotating arm 22
A and 22B are formed in a substantially L shape in a side view, the clamps 21A and 21B are connected to one end by connecting pins 23A and 23B so as to be rotatable in the vertical direction, and the other end is the jack for each clamp.
The outer ends of the pistons of 20A and 20B are rotatably connected via connecting pins 24A and 24B, and the bent portions are rotatably supported by fixed shafts 25A and 25B provided on the movable body 16. A cable gripping surface 26 of each of the clamps 21A and 21B facing each other and gripping the communication cable 4 is formed in a waveform shape similar to a sine curve as shown in FIG. 7, and has a length of about 20 cm.

Next, a cable removing operation by the underground cable removing device 5 having such a configuration will be described.

1 and 2, in order to pull out the residual cable 4 housed in the underground pipe 2, the manhole 1
The underground cable removing device 5 is carried in, the pedestal 12 is fixed by the outrigger 11, the front surface of the outer frame body 15 is brought into contact with the reaction steel material 6, and the movable body 16 is positioned in front of the device. Next, open the clamps 21A and 21B with the clamp jacks 20A and 20B,
The end portion of the remaining cable 4 protruding from the duct port 3 is provided with an outer frame body.
Insert the cable insertion steel 18A of 15 between the clamps 21A and 21B. Next, use the clamp jacks 20A and 20B to clamp
After closing the remaining cable 4 by compressing the remaining cable 4 by closing 21A and 21B, the towing jacks 17A and 17B are driven to extend the piston and push the movable body 16 backward. At this time, the outer frame body 15 is pressed against the reaction force steel material 6 by the reaction force. When the movable body 16 moves backward, the clamp mechanism 19 also moves backward together with it, so that the cable 4 in the underground pipeline 2 is pulled out. After the movable body 16 is moved backward, the clamp jacks 20A and 20B open the clamps 21A and 21B to temporarily release the gripped state of the cable 4, and the pulling jacks 17A and 17B are driven again to retract the piston and move the movable body.
Return 16 to its original forward position. Then, by repeating the above operation continuously, the cable 4 is pulled out from the underground conduit 2, guided to the ground through the cable guide hole 18B of the outer frame body 15, and wound by the power winch installed on the ground.

In this case, the traction capacity of the underground cable removing device 5 is extremely large (about 20 tons) because the jack is used.
Therefore, it is possible to pull up to the breaking strength of the cable.

The series of operations described above is performed via a hydraulic hose by an operation panel, a hydraulic pump, etc. (not shown) installed on the ground, and is repeatedly performed until the removal is completed.

In addition to the telecommunication cable 4, the present invention can of course be applied as it is to a cable having a copper wire such as a power cable.

[Effects of the Invention] As described above, the underground cable removing device according to the present invention is a device for gripping, pulling, and removing the communication cable housed in the underground pipe from the manhole, and the device front part. In which the communication cable is gripped and the gripping state is released in the rear of the device, a pair of hydraulic cylinder jacks for clamping that operate the clamp mechanism, and the gripped communication cable is moved to the rear of the device together with the clamp mechanism. And a hydraulic cylinder jack for traction, wherein the clamp mechanism is composed of a pair of openable and closable clamps in which a cable gripping surface is formed in a sinusoidal waveform and is connected to each clamp hydraulic cylinder jack by a connecting pin, To reciprocate the clamp mechanism continuously by the hydraulic cylinder jack for towing Therefore, it is possible to pull the cable up to the breaking strength, which has not been achieved so far, and the operation can be continuously performed.

Also, if the remaining cables can be removed, it will be possible to effectively utilize the existing underground pipeline, which is extremely economical and
Since it is possible to suppress the construction work for adding new ground pipelines, the road environment will not be damaged.

Further, since the cable gripping surface of the clamp has a corrugated shape, it is possible to obtain a sufficient gripping force for gripping the cable without separating the cable jacket and the cable core wire.

[Brief description of drawings]

FIG. 1 is a side view of an embodiment of an underground cable removing device according to the present invention during a cable removing operation, FIG. 2 is a rear view of the same, and FIG. 3 is a cable removing device main body shown in FIG. I
II line sectional view, FIG. 4 is a front view of the same apparatus main body, FIG. 5 is a rear view of the same apparatus main body, FIG. 6 is FIG.
7 is a perspective view of the clamp. FIG. 1 …… Manhole, 2 …… Underground pipeline, 4 …… Communication cable, 5 …… Underground cable removal device, 12 …… Mounting base, 13 ……
Cable removal device main body, 15 …… Outer frame body, 16 …… Movable body,
17A, 17B …… Towing hydraulic cylinder jack, 19 …… Clamping mechanism, 20A, 20B …… Clamping hydraulic cylinder jack, 21A, 21B …… Clamp, 26 …… Cable gripping surface.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-2-193511 (JP, A) Actual opening Sho 50-139596 (JP, U) Actual opening Sho 62-74416 (JP, U) Actual opening 1- 50621 (JP, U)

Claims (1)

(57) [Claims] 1. A device for gripping, pulling and removing a communication cable housed in an underground conduit from a manhole, wherein the communication cable is gripped at the front part of the device and the gripped state is released at the rear part of the device. And a pair of clamping hydraulic cylinder jacks for operating the clamping mechanism, and a towing hydraulic cylinder jack for moving the gripped communication cable together with the clamping mechanism to the rear of the device. It is composed of a pair of openable and closable clamps whose gripping surface is formed in a sinusoidal waveform and is connected to each clamping hydraulic cylinder jack by a connecting pin. The towing hydraulic cylinder jack continuously reciprocates the clamping mechanism. Underground cable removal characterized by removing the communication cable by Apparatus.