JPH1169538A - Stringing clamp mounting method, and stringing clamp device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a clamp member which is capable of surely holding a cable by a body member and capable of attaching/detaching the cable in the clamp member to be used in stringing or withdrawal of the cable. SOLUTION: A body member to be mounted on a conductor 2 of a cable 1 is first mounted on the conductor 2, a tapered wedge member 30 is inserted in a tip part of the conductor, the body member is moved to the tip part side using a gear puller 50 through a support base 40, a cap member is mounted thereon, and a wire for fraction, etc., is connected thereto. In the body member 11, a through-hole is of tapered shape where the tip part is large in diameter and the number is moved by the gear puller so as to surely hold the conductor.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an extended wire clamp which is attached to the end of a power cable when laying a power cable or removing an existing cable, and is used to connect to a wire to be pulled. More particularly, the present invention relates to a clamp member that can be easily attached to and detached from a cable conductor and that can securely hold a conductor tip, and a method of attaching the same.

[0002]

2. Description of the Related Art When laying a power cable in a tunnel or hanging it on a steel tower, a laying wire clamp device is conventionally used, and the laying wire clamp device is fixed to a distal end portion of a cable conductor. At the same time, a method of attaching a tow wire and pulling the cable using a winch or the like is used. The extension wire clamping device needs to be firmly fixed to the conductor, and is configured so as not to come off even when a large traction force is applied. As the extension wire clamping device, for example, as shown in Japanese Utility Model Publication No. 44-21160, a cylindrical holder is arranged on the outside and a conductor is expanded by inserting a wedge member into the center of the conductor. The holder is fixed, and a towing portion provided with a hook is attached to the tip of the holder, and is connected to a towing wire.

[0003]

The extension wire clamping device is required to have a structure that can securely hold the cable conductor and can be easily attached. In such a case, fixing and detaching from the conductor are relatively troublesome. Further, in the case of using a method of fixing members constituting the extension wire clamping device to the conductor using solder or the like, there is a disadvantage that even if the extension wire clamping device is removed from the conductor, it cannot be easily reused. . In view of the above, there has been proposed a device that has a simple structure and can be easily attached and detached by using a combination of the wedge member and the cylindrical clamp member.

However, when laying a cable in an underground pipe or the like, a very large traction force is required when the cable is to be pulled. There is a problem that it is not enough. In addition to the cable laying, the wire extension clamp device is also used for removing an old cable.However, in the case of a cable laid in an underground pipeline, traction inside the pipeline is performed. Since the resistance is very large, there is a demand for a material capable of firmly exhibiting a fixed holding performance with respect to a conductor.

[0005] The present invention solves the above-mentioned problems of the conventional wire drawing clamp device, and can be easily attached to and detached from the cable conductor, and even when a large traction force is applied, the conductor can be removed. An object of the present invention is to provide a clamp member capable of reliably exerting a holding action.

[0006]

SUMMARY OF THE INVENTION The present invention relates to a method of attaching a wire extension clamp attached to the end of a power cable when laying a power cable or removing an existing cable. The invention according to claim 1 of the present invention provides a cylindrical main body member arranged in a state where a cable conductor is tightened, a wedge member inserted into a center portion of the conductor, and a wedge member attached to a distal end portion of the main body member, for towing. A step of inserting a wedge member from a distal end portion of the conductor into a central portion of the conductor after attaching the main body member so as to surround the cable conductor by using an extended wire clamp including a cap member for connecting a wire; The method includes a step of moving the member toward the conductor tip, and a step of attaching a cap member to the moved main body member. The invention according to claim 2, after inserting a wedge member at the tip of the cable conductor, positioning the puller support base at the tip of the conductor,
The main body member is moved toward the front end of the conductor by a gear puller attached via the puller support. The invention according to claim 3, wherein the gear puller used for moving the main body member is a combination of a puller main body provided with a threaded bar guide, and arm members provided at both ends of the puller main body via hinges. At the tip of the member, a member provided with a member to be locked to the jaw of the main body member is used, and a puller support for positioning the gear puller at the tip of the conductor has a wedge member on a pressing surface corresponding to the conductor. A lower concave hole that allows the head to enter is provided, an upper concave hole that locks the screw rod of the gear puller is arranged on the upper member, and it is configured as a disk-shaped member smaller in diameter than the through hole of the main body member. And

According to a fourth aspect of the present invention, there is provided a cylindrical main body member arranged to clamp a cable conductor, a wedge member inserted into a center portion of the conductor, and a wedge member attached to a distal end portion of the main body member. A cap member for connecting a towed wire, the main body member is provided with a through hole having a small diameter at the base side of the exposed cable conductor and a large diameter at the tip end side of the conductor, and an outer peripheral portion of the main body member. Is an extension wire clamping device provided with a ring-shaped jaw portion and an external thread portion corresponding to the cap member on the distal end side. The invention according to claim 5, wherein the cap member combined with the main body member has a head member provided with a screw hole for connecting a tow wire to the head, and an opening provided with an internal thread portion corresponding to the external thread portion of the main body member. And a wedge member to be inserted into a central portion of the conductor, wherein the wedge member is provided with an engaging portion on a head portion with which a tool can be engaged.

Therefore, in the method of the present invention, after the cylindrical main body member is mounted on the conductor, the wedge member is inserted from the conductor tip to expand the conductor, and thereafter the main body member is moved. Then, the conductor is held by the tapered through-hole, so that the main body member can favorably hold the conductor. Further, since the puller support base and the gear puller are used in combination in order to move the main body member to the conductor front end side, the main body member has a large diameter at the front end side due to the insertion of the wedge member. The effect of tightening and fixing can be satisfactorily exhibited, and even when a large traction force is applied via the cap member, the function of holding the cable can be accurately maintained. The clamp member to be mounted as described above can be easily removed from the cable conductor after the wire drawing operation, and can be used repeatedly.

In the apparatus according to the present invention, the main member provided with the tapered through-hole can effectively exert the effect of holding the conductor into which the wedge member is inserted, and the cable can be pulled by the structure described above. Even when the resistance at the time is large, the main body member can perform the fixing and holding operation of the cable tip. Further, in a gear puller for moving the main body member to the distal end side of the conductor, the use of the puller support base makes it possible to easily perform a moving operation on the main body member. Further, in the gear puller used in combination with the puller support, the main body member is moved using the threaded rod, so that the movement operation with respect to the main body member can be easily performed.
And, in the wedge member to be inserted into the conductor, since a hexagonal head as an engaging portion is provided in a portion exposed from the conductor, it can be easily rotated via the hexagonal head when extracting the wedge member, The wedge member can be easily removed after the completion of the cable pulling operation.

[0010]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a wire clamping device according to the present invention. A clamp member 10 shown in FIGS. 1 and 2 is attached to a distal end portion of a cable to be pulled. The main body member 11 is disposed so as to cover (grasp) a conductor. It is configured by combining with a cap member 20 for connection to the like. FIG. 1 shows a main body member 11 and a cap member 20.
FIG. 2 shows the structure of each component in a state where the two members are separated from each other.

In the clamp member 10, the main body member 11 is formed as a substantially cylindrical member, and the side of the through hole 12 passing through the center portion of the main body where the cable is inserted is set as the small diameter portion 13 and is targeted. The diameter is slightly larger than the size of the conductor, and the other end is configured as a large diameter portion 14. As described later, the large-diameter portion 14 is configured in such a size that the conductor can be pressed from the periphery by the large-diameter portion and held in a state where the conductor is expanded by driving a wedge member from the tip of the conductor. The inner surface of the through-hole 12 is expanded in a tapered shape. A jaw 15 is formed on the outer periphery of the main body member 11 so as to protrude in a ring shape, and a ring-shaped groove 1 is provided at a base of the jaw.
6, and an external thread portion 1 for mounting a cap member
7 are provided.

The cap member 20 attached to the main body member 11 is a substantially cup-shaped member having the head member 21 as a bottom portion.
Is provided so as to correspond to the external thread portion 17 of the main body member.
A screw hole 22 is provided at the center of the head 21 of the cap member 20, and a bolt for connecting a wire is attached to the screw hole 22 so that the cable can be pulled. In the clamp member 10, the main body member 11 is attached to the cable conductor, and then the cap member 20 is attached to the clamp member 10. The cap member 20 is assembled as shown in FIG. Let it do.

The wedge member 30 shown in FIG. 3 shows the configuration of the wedge member 30 inserted from the front end side of the center portion of the cable conductor and used for expanding the conductor. The wedge member 30 is configured such that a tip portion 31 to be inserted into a conductor is sharp at a sharp angle, and has a tapered surface 32 that is tapered toward the head portion 34 so as to gradually increase in diameter. In addition, a hexagonal head 33 is provided at the base of the head 34, and when the wedge member is pulled out from the conductor, a tool or the like is locked on the hexagonal head so that the wedge member can be easily removed while rotating. It is configured so that it can be performed.

In the puller support 40 shown in FIG. 4, after the main body member 11 is mounted on the conductor, the wedge member is driven to expand the main body member 11, and then the main body member is moved toward the distal end of the conductor. Used when A lower concave hole 42 for accommodating the head of a wedge member is arranged on a pressing surface 41 pressing against the end of the conductor of the puller support base 40, and an upper member 43 is used for positioning a tip end of a screw bar of a gear puller. The upper concave hole 44 is provided. The puller support base 40 is configured as a substantially disk-shaped member, and the diameter thereof is configured substantially the same as the diameter of the conductor. When the main body member is moved to the end of the conductor, , So that the main body member is not caught.

[0015]

Next, the case where the clamp member of the present invention is attached to and detached from the distal end of a cable conductor will be described with reference to FIGS. As shown in FIG.
In this method, the insulator is removed in advance to expose a predetermined length, so that it can be used for towing work. When the main body member 11 is attached to the exposed conductor 2 from the tip end side, the small-diameter portion has a small gap with respect to the conductor, but the large-diameter portion has the inner surface of the through hole 12 and the peripheral portion of the conductor. A large gap is formed in the gap. Then, as shown in FIG.
When the wedge member 30 is driven from the tip end side toward the center of the conductor 2 and is inserted to a position where the hexagonal head is exposed, the outer diameter of the conductor 2 is expanded by the wedge member. The conductor 2 is expanded to the portion so that no gap is generated.

After the main body member and the wedge member are mounted on the conductor, as shown in FIGS. 7 and 8, a gear puller 50 and a puller support base 40 are mounted on the front end side of the conductor in combination. 11 is moved. The puller support 40 is provided with a wedge member 3 protruding from the tip of the conductor.
The gear puller 50 is mounted by positioning the head of No. 0 in a state of being accommodated in the lower concave hole, locking the tip of the screw rod 52 to the upper concave hole of the puller support base. In the gear puller 50, arm members 53 and 53a are arranged via hinges at both ends of a puller main body 51 provided with a nut member that engages with a threaded bar, and claw members 54 and 54a are provided at a tip end of the arm member. Each is provided.
Then, as shown in FIG. 7, the end of the screw rod 52 of the gear puller 50 is positioned with respect to the upper concave hole of the puller support, and the claw members 54 and 54a are respectively locked to the jaw 15 of the main body member. Then, the gear puller is positioned with respect to the conductor tip.

Next, the screw rod 5 of the gear puller 50
2 is rotated using a tool (not shown), and the screw rod 52 is projected toward the puller support base 40, so that the reaction force of the projecting operation of the screw rod causes the main body member 11 to move to the leading end of the conductor. Move toward. By moving the main body member 11, the conductor 2 whose end is expanded by inserting the wedge member 30,
The through-hole of the main body member 11 is pressed and tightened from the outer surface, and the conductor is compressed and held from the outer surface. And FIG.
As shown in (5), by moving the gear puller 50 to a predetermined position, the fastening operation by the main body member 11 is completed.

As described above, after positioning the main body member with respect to the conductor, the cap member 20 is mounted as shown in FIG. 9 and the clamp member 10 is mounted at the tip of the conductor. The inner threaded portion of the opening is sufficiently screwed into the portion and fixed. Then, a bolt member for connecting a wire is attached to a screw hole provided in the head member of the cap member 20 to cope with the operation of pulling the cable.

In the example shown in FIGS. 10 to 12, the operation of pulling out the wedge member after removing the cap member after the cable pulling operation and then pulling out the main body member is described in order. The example of FIG. 10 shows a case where the cap member 20 is removed from the main body member 11 after the cable pulling operation, and the cap member 20 is easily removed by rotating the cap member in a direction to loosen the screw. Can be. Then, after removing the cap member, as shown in FIG. 11, the main body member 11 is moved to the base of the exposed conductor, and the wedge member 30 is removed in a state where the conductor clamping action by the main body member is released. Pull out. When the main body member 11 is moved toward the base of the conductor, the main body member 11 can be moved by hitting the front end of the main body member without damaging the main body member. Also,
When the wedge member 30 is pulled out, it is in a state of being bitten into the inside of the conductor. For example, the state in which the tool is locked to the hexagonal head 33 and rotated to eliminate the state of biting into the conductor is eliminated, and then the head is grasped. Can be pulled out.

When the wedge member 30 is removed as described above, the conductor 2 remains with a large gap formed in the center, and therefore, as shown in FIG.
The operation of extracting 1 can be easily performed. Further, when the main body member 11 is pulled out from the conductor, it is possible to slide the conductor and pull out the main body member from the lower part of the main body member while applying a tapping action from the lower part of the main body member. You can also do work.

[0021]

Embodiment 2 In the present invention, each of a body member constituting a clamp member and a wedge member for driving a conductor can also be constituted as shown in FIGS. In the wedge member 30a shown in FIG.
A helical portion 3 between the tapered portion 32 and the hexagonal head 33
5 are provided, and the other parts are configured in the same manner as the wedge member shown in FIG. The spiral part 35
Is the hexagonal head 3
The wedge member can be effectively used when the wedge member is rotated in the pull-out direction by locking a tool to the wedge member, so that the work of extracting the wedge member from the conductor can be easily performed. When driving the wedge member of FIG. 13 into a conductor,
It is necessary to set the shape of the screw-shaped protrusion of the helical portion so that the helical portion does not damage the conductor of the conductor.

The example shown in FIG. 14 shows an example in which a number of ring-shaped projecting members are arranged on the inner surface of the through hole 12a in the main body member 11 shown in FIG. The main body member 1
In 1a, the structure of the through-hole 12a is changed without changing the structure of the portion to be combined with the cap member 20, and the like.
The structure is such that the fastening and fixing action to the conductor can be exhibited well. The ring-shaped steps 18, 18a... Provided to protrude from the inner surface of the through hole 12a have an inner diameter that is sequentially set to be larger from the smaller diameter part to the larger diameter part. The inner diameter of the projection is set slightly larger than the outer diameter of the conductor, and the inner diameter of the ring-shaped step 18a is larger than that of the ring-shaped step 18.

When attaching the body member 11a to the cable conductor, as shown in FIGS. 4 to 8, the body member 11a is attached to the conductor, the wedge member is driven in, When the conductor is moved to the side, the action of strongly tightening the conductor is imparted to the ring-shaped step. Therefore, when the cable is pulled through the clamp member combined with the cap member, the main body member can strongly exert the action of holding the conductor, and the conductor holding action can be reliably performed. .

[0024]

Therefore, in the method for mounting a wire clamp according to the present invention, after the main body member is mounted on the conductor, the wedge member is inserted from the conductor tip to expand the conductor, and thereafter the main body member is expanded. Since the member is moved and held by the tapered through hole, the effect of holding the conductor by the body member can be favorably performed. Further, since the puller support base and the gear puller are used in combination in order to move the main body member to the conductor front end side, the main body member has a large diameter at the front end side due to the insertion of the wedge member. The effect of tightening and fixing can be satisfactorily exhibited, and even when a large traction force is applied via the cap member, the function of holding the cable can be accurately maintained. The clamp member to be mounted as described above can be easily removed from the cable conductor after the wire drawing operation, and can be used repeatedly.

In the extension wire clamping device of the present invention, the above-described configuration enables the main body member provided with the tapered through-hole to effectively exert the function of holding the conductor into which the wedge member is inserted, Even when the resistance at the time of pulling the cable is large, the main body member can perform the fixing and holding action of the cable tip. Further, in a gear puller for moving the main body member to the distal end side of the conductor, the use of the puller support base makes it possible to easily perform a moving operation on the main body member. Further, in the gear puller used in combination with the puller support, the main body member is moved using the threaded rod, so that the movement operation with respect to the main body member can be easily performed. And, in the wedge member to be inserted into the conductor, a hexagonal head as an engagement portion is provided in a portion exposed from the conductor, so that when the wedge member is extracted, it can be easily rotated via the hexagonal head. The wedge member can be easily removed after the towing operation is completed.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing a configuration of a clamp member of the present invention.

FIG. 2 is an explanatory view in which a clamp member is disassembled.

FIG. 3 is an explanatory view of a wedge member of the present invention.

FIG. 4 is an explanatory diagram of a puller support base.

FIG. 5 is an explanatory diagram of a state in which a main body member is mounted on a conductor.

FIG. 6 is an explanatory view of a state in which a wedge member is driven from a tip portion of a conductor.

FIG. 7 is an explanatory diagram showing a state in which a gear puller is attached to a main body member.

FIG. 8 is an explanatory diagram of a state where a main body member is moved by a gear puller.

FIG. 9 is an explanatory view of a state in which a cap member is attached to a main body member to cope with cable pulling.

FIG. 10 is an explanatory diagram of a state in which a cap member is removed after the cable is pulled.

FIG. 11 is an explanatory view of a state where a wedge member is pulled out after a cap member is removed.

FIG. 12 is an explanatory diagram of a state in which a main body member is removed.

FIG. 13 is an explanatory diagram showing another configuration of the wedge member.

FIG. 14 is an explanatory view of another embodiment of the main body member.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Cable, 2 conductors, 10 Clamp member, 11 Body member, 12 Through hole, 15
Jaw, 16 groove, 17 external thread, 20
Cap member, 21 head member, 22 screw hole,
23 opening part, 24 internal thread part, 30 wedge member, 31 tip part, 32 taper part, 33
Hex Head, 34 Head, 40 Puller Support, 41 Pressing Surface, 42 Lower Hole, 43
Upper member, 44 upper concave hole, 50 gear puller,
51 Puller body, 52 Screw bar, 53
Arm members, 54 claw members.

Claims (5)

[Claims] 1. A method of mounting a wire extension clamp attached to a tip end of a power cable when laying a power cable or removing an existing cable, the cylindrical body being arranged so as to tighten a cable conductor. A wedge member to be inserted into the center of the conductor, and a wire clamp attached to the tip of the main body member, the cap member being connected to a towed wire. After attaching the main body member, a step of inserting a wedge member from the front end portion into the center of the conductor, a step of moving the main body member toward the conductor front end side, and a cap on the moved main body member Mounting a member. 2. The gear puller according to claim 1, wherein a wedge member is inserted into a tip of the cable conductor, a puller support is positioned at the tip of the conductor, and the puller is mounted via the puller support. 2. The method according to claim 1, wherein the main body member is moved toward the conductor tip portion by the method. 3. A gear puller used for moving the main body member, wherein a puller main body provided with a threaded bar guide portion and arm members provided at both ends of the puller main body via hinges are combined. The tip end is provided with a member to be locked to the jaw of the main body member. The puller support for positioning the gear puller at the tip end of the conductor has a wedge member head on a pressing surface corresponding to the conductor. The upper member is provided with an upper concave hole for locking a screw rod of a gear puller, and the upper member is configured as a disk-shaped member having a smaller diameter than the through hole of the main body member. The method of mounting the wire extension clamp according to claim 2. 4. A wire clamp device which is attached to a leading end of a cable when connecting a power cable when laying a power cable or when removing an existing cable, and which is connected to a wire for towing. A cylindrical main body member arranged in a tightened state; a wedge member inserted into a central portion of a conductor; and a cap member attached to a distal end portion of the main body member and connecting a wire for drawing. A through hole having a small diameter on the base side of the exposed cable conductor and a large diameter on the tip side of the conductor, and a ring-shaped jaw on the outer periphery of the main body member and a cap member on the tip end side. A wire drawing clamp device provided with an external thread portion that performs the following. 5. A cap member combined with the main body member, comprising: a head member provided with a screw hole for connecting a tow wire to a head; and an opening provided with an internal thread portion corresponding to an external thread portion of the main body member. 5. The wire drawing clamp device according to claim 4, wherein the wedge member inserted into a central portion of the conductor has an engaging portion on a head portion with which a tool can be engaged. 6.