JP3894868B2 - Cable wiring jig - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a cable wiring jig, and more particularly to a cable wiring jig suitable for carrying out a wiring work when laying an overhead wire or laying a cable from a main pipe of an embedded pipeline to a branch pipe. .
[0002]
[Prior art]
When laying a cable in a cable conduit buried between hand holes, generally, after passing a guide wire, connect a tow rope or string to the guide wire and connect it to the tow rope or string. It will be the work of drawing in the cable and laying it. However, when there is an existing cable, the existing cable becomes an obstacle, and therefore, as described in Patent Document 1, for example, the guide includes two guides that can move on the existing cable and an air receiver provided therebetween. Use the device. The air receiving body is pressurized or sucked from the end of the pipeline to move on the existing cable, and a flexible member such as a piano wire attached to the rear of the apparatus is inserted. Therefore, the flexible member can be inserted through the existing cable. After the device is inserted, a rope or the like is tied to the piano wire or the like, and the piano wire or the like is pulled back from the device insertion side end. After the piano wire is pulled back, the cable for laying is connected to the tip of the rope in the same manner, and the cable is routed by pulling the rope back.
[0003]
However, when a cable is routed to a small-diameter pipe branched from the cable pipe, since the cable cannot be directly drawn into the branch pipe, the wiring work is usually performed according to the following procedure. .
That is, when a cable is passed from the main pipe to the branch pipe, a jig with a net attached to the tip, such as a guide wire, is inserted into the main pipe from the end of the branch pipe. A jig called a hook needle with a hook is inserted from the end of the main pipe opening in the hand hole, and the hook is hooked on the net portion of the jig inserted from the branch pipe and pulled out to the end of the main pipe. Connect a traction rope with a laying cable connected to a jig with a net at the end pulled out to the main pipe end. The cable can be passed from the main pipe to the branch pipe by pulling back the jig inserted from the end portion side of the branch pipe and winding up the pulling rope connected to the predetermined branch pipe.
[0004]
In order to simplify the cable laying on the branch pipe, for example, a jig described in Patent Document 2 is used. In this method, a rod having a substantially spherical tip is attached to the tip of a guide wire or the like, and the guide wire or the like is pushed out from the end of the conduit, thereby inserting the pipe. The spherical body at the tip of the rod reduces the curvature, level difference and friction with the existing cable. At this time, further effects can be obtained by applying a lubricant or the like to the rod. After the rod is inserted, the cable is routed by attaching and laying the laying cable back to the guide wire or the like.
[0005]
In addition, the tool described in patent document 3, for example is used regarding the passage of an overhead wire. This consists of a rod having a conical portion at the tip and a bowed and curved steel wire bound at both ends and secured to the rod. This tool is used by using a guide wire that connects between the laying points of an overhead wire called a messenger wire and a spiral monofilament wire arranged so as to be wound around the messenger wire. By connecting a wire for laying to the rear part of the tool and inserting it through the spiral formed by the monofilament wire, it is possible to reduce the work that the operator has repeatedly performed in and out of the overhead wire laying section.
[0006]
[Patent Document 1]
JP 2000-134750 A [Patent Document 2]
Japanese Patent Laid-Open No. 2002-44822 [Patent Document 3]
Japanese Patent Application Laid-Open No. 10-271627
[Problems to be solved by the invention]
However, in the above-described work for connecting to the branch pipe, the method using the hook needle is a work only with the sense of the hand, and therefore has high uncertainty. Furthermore, if the length of the pipeline is not grasped in advance, there is much time waste. In addition, troubles such as damaging existing cables may occur.
[0008]
The method of attaching a rod with a sphere to the tip of the guide cable is difficult to insert when there is a bend in a narrow branch pipe. When inserting a guide wire from the branch pipe into the main pipe, In some cases, the leading end of the wire rod gets into the cable, and a guide wire or the like gets entangled between the existing cables. Further, the entangled wire or the like cannot be advanced or returned, and the existing cable or the like may be damaged.
[0009]
With regard to the overhead wire, the space formed by the spiral wire is large when passing through the monofilament wire arranged in a spiral, and the bowed curved steel wire does not adhere to the spiral wire, There are cases where the space becomes narrow and insertion becomes difficult. In addition, if the space formed by the spiral wire is excessively large, the rod tip may be displaced from the center of the space and fall into the spiral gap.
[0010]
The present invention solves the above problems, and allows insertion of a guide wire or the like from the branch pipe to the main pipe without inserting the existing cable conduit tool at the tip into the existing cable group. Provide a cable wiring jig that can be easily operated without dropping the tip of the cable wiring jig into the gap of the spiral wire during the operation of drawing the main pipe from the main pipe to the branch pipe or the cable wiring work of the overhead line For the purpose.
[0011]
[Means for Solving the Problems]
In order to achieve the above object, in the cable wiring jig according to the present invention, a wiring rod, a cone attached to the tip of the wiring rod, and a rear end of the cone are positioned in the passage. And an expansion / contraction body that changes the external size according to the line space attached to the wire rod and prevents entanglement with the existing cable, and the expansion / contraction body binds both ends of a plurality of wire rods to the rod The bundling portion at one end is fixed to the rod while being attached to the rod, and the other end is movably mounted so that it can be expanded and contracted by movement of the movable end, which corresponds to the equator line of the expansion / contraction body. An intermediate position of the wire rod is connected by nylon thread or the like .
[0012]
The movable end of the expansion / contraction body may be configured to be biased so as to approach the fixed end side. The wire rod is characterized in that a substantial elasticity is reduced on the tip end side, and elasticity of the tone is given. Further, the through rod may be composed of a plurality of core wires, and the number of core wires may be reduced toward the tip side to form a pre-tone structure.
[0013]
[Action]
According to the present invention, when a guide wire or the like equipped with a cable wiring jig is inserted into a curved pipeline, the cone at the tip of the wiring rod serves as a guide along the pipeline wall surface. Since the tip of the wire rod is bent, the bending portion can be inserted with a smaller force than before. Further, when a guide wire or the like is inserted from the branch pipe into the main pipe, the expansion / contraction body that has been contracted in accordance with the branch pipe duct space expands. Due to the expansion of the expansion / contraction body, the tip end portion of the cable wiring jig is lifted above the existing cable group. Thereby, it is possible to prevent the tip of the cable wiring jig from entering the existing cable group and entangle it, and for the overhead wire, it is possible to prevent the tip of the cable wiring jig from falling between the spiral wires. In addition, by connecting a cable for laying instead of a guide wire or the like to the rear part of the cable wiring jig, the wiring work that has been conventionally performed in at least two steps can be performed in one step, and the work time can be reduced. It can be shortened.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments according to the present invention will be described below with reference to the accompanying drawings.
FIG. 1 shows a cross-sectional structure of the cable wiring jig 3. The cable wiring jig 3 according to this embodiment includes, as a basic configuration, a wiring rod 1 at the center and an abacus bead 8 as a cone at the tip. An expansion / contraction body 18 is provided on the rear side of the bead 8 by inserting the wire rod 1 through the wire rod 1 so as to change the external size according to the wire space and prevent the cable from being entangled. At the rearmost part of the wire rod 1, a joint 6 for connecting a guide wire 26 and the like used when the cable wire jig 3 is inserted is provided.
[0015]
First, as shown in FIG. 2, the wire rod 1 has a plurality of steel wires 2 coated with an outer skin 4 made of an elastic material such as rubber. The plurality of steel wires 2 are different in length, and constitute a core wire body that is bundled so that the number decreases as it goes to the tip. For this reason, the through rod 1 is given a tonal elastic force such that the substantial elastic force decreases toward the tip. As a result, the distal end side can be easily deformed along the pipeline even with respect to the curved portion in the narrow pipeline. Therefore, the pushing resistance force applied when the guide wire 26 or the like is inserted is reduced.
[0016]
The bead 8 is a cone provided at the tip of the wire rod 1. The pearl 8 is made of a resin material, and reduces the frictional resistance when contacting the pipe wall surface. Since the bead 8 is arranged with the apex of the cone directed toward the tip, as shown in FIG. 3, when the tip of the wire rod 1 comes into contact with the wall of the conduit bending portion, the wire 8 is connected along the wall. It plays the role of guiding the tip of the rod 1. By this bead 8, the pushing resistance force applied at the time of insertion is further reduced.
[0017]
The expansion / contraction body 18 has a structure in which both ends of the eight thick gussets 16 are bound. One of the binding portions is a cone shape, and the reference portion 12 is a fixed end that is almost fixed at a fixed position of the wire rod 1. The other is a slider portion 24 at a movable end which is similarly conical and is slidably mounted in the axial direction of the wire rod 1. The thick tegs 16 are arranged to bend so as to extend radially from the reference portion 12 and contract to the slider portion 24. Therefore, by making the distance between the reference portion 12 and the slider portion 24 constant, the expansion / contraction body 18 has a substantially spherical appearance, and conversely, the distance between the reference portion 12 and the slider portion 24 is increased. This results in a spindle shape and a substantial diameter is reduced. Since the expansion / contraction body 18 has eight thick tegs 16 arranged at equal intervals on the circumference, the midpoint position corresponding to the equator line is connected by a nylon thread 17 or the like. As a result, it is possible to prevent the existing cable from entering the gap in the longitudinal direction of the thick tegs 16 and to prevent the arrangement interval of the thick tegs 16 from changing extremely. The thick tegs 16 is an example of a wire rod, and is not limited, and may be a piano wire, nylon, or the like. Further, the number is not particularly limited as long as the function is not hindered.
[0018]
Between the reference portion 12 and the slider portion 24 of the expansion / contraction body 18, a tubular stopper 14 fixed to the wire rod 1 is arranged so as to restrict the movement of the reference portion 12. Similarly, a circular restoration guide 20 that restricts the movement of the slider portion 24 is fixed. The restoration guide 20 and the slider portion 24 are connected by a coil spring 22 wound around the wire rod 1, and even if the slider portion 24 moves away from the restoration guide 20 at a fixed position, the slider portion 24 is caused by the spring action. The action force is set to work back. For this reason, when the expansion / contraction body 18 is compressed and contracted by an external force, the slider portion 24 slides on the connecting rod 1 and is separated from the restoration guide 20, and when the external force is released, the coil spring 22 acts to restore the restoration guide 20. Pulled back. Thereby, the free shape of the expansion / contraction body 18 becomes a shape along the spherical surface.
[0019]
The reference portion 12 is loosely fitted so as to be slightly movable along the wire rod 1 between a circular tubular positioning portion 10 fixed to the wire rod 1 at the rear of the bead 8 and the stopper 14, so-called play. I'm taking the bill.
The joint 6 provided at the rear end of the wire rod 1 can be screwed to the threaded portion at the tip of the guide wire 26. Therefore, the cable wire jig 3 serves as a leading role for the guide wire 26. It has come to fulfill.
[0020]
FIG. 4 shows a state where the cable wiring jig 3 is connected to the tip of the guide wire 26 and is inserted into the pipe line. The cable wiring jig 3 is inserted from the open end of the branch pipe 28. Since the inner diameter of the branch pipe 28 is smaller than the outer dimension of the expansion / contraction body 18, the expansion / contraction body 18 is held in a bent state by a force for pushing out the guide wire 26 and the like when inserted into a narrow pipe line. The thick tegs 16 are stretched to the extent that they fit within the pipe inner diameter. At the same time, the slider portion 24 slides rearward of the wire rod 1, and the coil spring 22 is stretched as the slider portion 24 slides. The above state is the contracted state of the expansion / contraction body 18. In the cable wiring jig 3 inserted through the narrow pipe line and inserted into the large-diameter main pipe 30, the slider portion 24 is pulled back by the force of the coil spring 22, and the thick teg 16 returns to the predetermined bent state. The above state is the expanded state of the expansion / contraction body 18. Due to the expansion / contraction action of the expansion / contraction body 18, it is possible to easily cope with the passage when the branch pipe 28 has a portion having a change in the tube diameter such as the reduced diameter portion 29. Due to the expansion action caused by the elasticity of the coil spring 22 of the expansion / contraction body 18 and the thick tegs 16, the end of the cable passing jig 3 is lifted above the existing cable group 32, and the cable connection jig 3 enters the existing cable group 32. It is possible to prevent entanglement. Even if the cable 31 already exists in the same branch pipe 28, the cable wiring jig 3 is entangled with the existing cable 31 in the branch pipe 28 at the junction with the branch pipe 28 or the main pipe 30. This can be prevented.
[0021]
The cable wiring jig 3 moves along the pipeline by extruding the guide wire 26 connected to the rear part of the cable wiring jig 3. As shown in FIG. 3, the bending portion is bent so as to slide on the pipe wall surface with the pearl 8 as a guide. For this reason, it is possible to avoid applying an excessive force to the wire rod 1, the pipe wall surface, and the guide wire 26. In the branch pipe 28, the expansion / contraction body 18, which has been contracted according to the pipeline, expands after being inserted into the main pipe 30. Due to the expanded / contracted body 18, the tip of the cable wiring jig 3 is lifted above the existing cable group 32 laid on the main pipe 30. Therefore, it is possible to prevent the tip of the cable wiring jig 3 from entering the existing cable group 32 and getting entangled.
[0022]
After the guide wire 26 is inserted into the hand hole portion of the main pipe 30 as described above, the cable wiring jig 3 connected to the tip of the guide wire 26 with the joint 6 is removed. Thereafter, a pulling rope having a laying cable connected to the tip of the guide wire 26 is connected, and the guide wire 26 is pulled back to the opening side of the branch pipe 28. Then, by winding the tow rope, the cable is routed and the installation of the cable on the branch pipe 28 is completed.
[0023]
By energizing the slider portion 24 so as to be close to the reference portion 12, the expansion state of the expansion / contraction body 18 can be kept constant. Therefore, the secular change of the restoring force due to the sag of the filament material such as the thick teg 16 can be reduced, and the life becomes long and continuous use is possible.
[0024]
By applying a tonal elastic force to the wire rod 1, the tip of the wire rod 1 is easily bent along the wall surface of the curved pipe, and the wire rod 1 is inserted when the pipe curved portion is inserted. The reaction force such as frictional resistance added to the tip can be reduced, and the labor for insertion can be reduced. Further, the wire rod 1 is composed of a plurality of core wires, and the number of core wires is decreased as it reaches the tip, so that it is possible to give the wire rod 1 a stepwise change in elastic force. That is, it is possible to apply the elastic force of the first tone without applying a taper or the like to the wire rod 1.
[0025]
In the present embodiment, an example of the cable wiring jig 3 in the buried pipeline has been described, but it can also be used as an overhead wire wiring tool using a spiral wire through which a messenger wire is inserted.
In addition, when used for the overhead wire, the tip of the wire rod 1 is always located at the center of the insertion space formed by the spiral wire when the cable wire jig 3 is inserted, so that the spiral space Regardless of the size, the work can be easily performed without the tip of the cable wiring jig 3 falling into the gap between the spiral wires.
[0026]
【The invention's effect】
As described above, according to the present invention, the wire rod, the cone attached to the tip of the wire rod, and the wire attached to the wire rod located behind the cone. The structure is equipped with an expansion / contraction body that can change the external size according to the space and prevent entanglement with the existing cable, so that when the guide wire is inserted from the branch pipe to the main pipe, the guide wire is connected to the existing cable group. Etc. can be inserted without sneaking in.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a structure of a cable wiring jig.
FIG. 2 is a cross-sectional view showing a structure of a wire rod.
FIG. 3 is a diagram showing the behavior of a cable wiring jig in a curved pipe line.
FIG. 4 is a view showing a state when a cable wiring jig is inserted from a branch pipe to a main pipe.
[Explanation of symbols]
1 ......... Wire rod, 2 ......... Steel wire, 3 ......... Cable connection jig, 4 ...... Skin, 6 ......... Joint, 8 ...... Bad, 10 ......... Positioning part, 12 ......... Reference part, 14 ......... Stopper, 16 ......... Thick, 17 ...... Nylon thread, 18 ...... Expanded / contracted body, 20 ...... Restoration guide, 22 ...... Coil spring, 24 ... ...... Slider part, 26... Guide wire, 28... Branch pipe, 29... Reduced diameter part, 30 ... Main pipe, 31 ... Cable, 32 ... Existing cable group.

Claims (4)

A wire rod, a cone attached to the tip of the wire rod, and an existing size variable in size according to the wire space located behind the cone and attached to the wire rod An expansion / contraction body that prevents entanglement of the cable, and the expansion / contraction body binds both ends of a plurality of wire rods to the wire rod and attaches the wire to the wire rod, and passes the bundling portion at one end. It is fixed to the rod, and the other end is movably mounted so that it can be expanded and contracted by moving the movable end, and the intermediate position of the filament material corresponding to the equator line of the expansion / contraction body is connected by nylon thread etc. A cable wiring jig characterized by that .   The cable wiring jig according to claim 1, wherein the movable end of the expansion / contraction body is biased so as to be close to the fixed end side.   2. The cable wiring jig according to claim 1, wherein the wiring rod is provided with a first-order elasticity so that a substantial elastic force is reduced on a distal end side.   4. The cable wiring jig according to claim 3, wherein the wiring rod is composed of a plurality of core wires, and the number of core wires is reduced toward the tip end side to form a toned structure.

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