JP4408680B2 - Wire netting pooling eye for cable traction - Google Patents

Description

  In this invention, when a plurality of cables are pulled into a pipe line, the ends of the plurality of cables are fixed to a cable clamp fixing bracket, and a pulling wire is hooked on a hook at the tip of the cable clamp fixing bracket. The present invention relates to a pooling eye that draws the cable into a pipeline.

For example, as shown in FIG. 12, a conventional cable pulling eye for cable pulling has a cable clamp 52 attached to the tip of each of a plurality of cables 51, and each cable clamp 52 is provided with an eye-shaped hook 53a. The cable clamp fixing metal 53 is provided with a cap-shaped steel pipe cover 54 that covers the cable clamp fixing metal 53, the cable clamp 52, and the tip of the cable 51. Yes. Then, the cable tip is protected by the steel pipe cover 54, and a pulling wire (not shown) is locked to the hook 53 a of the cable clamp fixing metal 53. (Omitted) The cable is pulled in.
JP 2001-218351 A

There is an increasing need to extend a cable to a pipeline having a smaller inner diameter than the conventional one, and the pipeline is often bent.
However, the cap-shaped steel pipe cover 54 has an outer diameter larger than the outer diameter of the bundled cables 51 and is not flexible because it is made of steel pipe. Therefore, when pulling the cable into the pipe line from the other end of the pipe line using the pulling wire, if the cable is drawn using this pooling eye, the outer diameter of the steel pipe cover 54 at the tip of the cable is large. It hits the inner wall and the passage is very bad. Moreover, when the pipe line is bent, the steel pipe cover 54 is not flexible and has a large diameter, so that it is difficult to pass therethrough.
Moreover, the outer diameter of the pooling eye using this steel pipe cover is constant regardless of the thickness of the cable. If a plurality of types of steel covers that are bothered to the diameter of the cable are provided, the cost increases, so only one type of cover is prepared. Therefore, a pooling eye using a cover of a large outer diameter steel pipe must be used even with a small outer diameter cable. Is the current situation.

  The present invention has been made in view of these points. By covering the tip of the cable to be pulled with a net, the outer diameter of the tip is not expanded, and the flexibility is improved. The object of the present invention is to provide a pulling eye for cable pulling that can cope with a reduction in the inner diameter of the road and that can pass through the bent pipe line very smoothly without resistance, and to solve the above problems.

According to the first aspect of the present invention, a plurality of cable ends are fixed or locked to a cable clamp fixing bracket, a pulling wire is hooked on a hook at the tip of the cable clamp fixing bracket, and the cable is inserted into the pipe line by the pulling wire. Attach the cable clamp to the tip of each cable in the pooling eye that pulls in the cable, lock each cable clamp to the cable clamp fixing bracket, and bundle multiple cables. These cable clamp fixing bracket, cable clamp and cable tip Is covered with a substantially cylindrical wire net whose tip end is constricted and the inner diameter of the tip opening is smaller than the outer diameter of the cable clamp fixing bracket, and the hook of the cable clamp fixing bracket is protruded from the tip opening of the wire net. The cable clamp is inserted into the taper hole of the clamp body. Pass the tip of the bull through, and drive a wedge through the opening opposite the taper hole to fix the cable to the clamp body, cover the opposite opening with a cap and screw it in, and tighten the bolt shaft at the tip of the cap. The bolt shaft protruding from the front end surface of the cable clamp fixing bracket through the plurality of holes formed in the disk portion of the cable clamp fixing bracket made of a plate having an outer diameter substantially the same as the outer diameter of the plurality of cables. A wire net type pooling eye for cable pulling, which is an assembled prefabricated type in which a nut is screwed and fixed, is used.

According to the first aspect of the present invention, the front end of the cable drawn into the pipe is covered with the cover by the wire net, and is protected from the impact of contact with the inner peripheral wall of the pipe, and the conventional cover by the steel pipe. Unlike the cable, the small diameter can be maintained without increasing the outer diameter of the cable tip, so the passage performance in the pipeline is very good. In addition, since the wire net has flexibility, the tip end portion of the cable covered with the net bends along the bend of the pipeline, and the cable can pass smoothly at the curved portion of the pipeline. In addition, the cable clamp can be easily attached to and detached from the cable, and the cable clamp can be easily attached to and detached from the cable clamp fixing bracket. It can be assembled and disassembled on site, and these parts can be used again at different sites, reducing costs. Can be planned.

  In the above-described pooling eye, by covering the outer periphery of the plurality of cable tips and the cable clamp fixing bracket with a substantially cylindrical net whose tip opening inner diameter is smaller than the outer diameter of the cable clamp fixing bracket, The cable and the like can be protected without expanding the outer diameter, and the tip end portion of the cable bends along the bend of the pipeline, so that the passage performance in the pipeline is very good.

Hereinafter, the present invention will be described in detail with reference to the drawings. In the following drawings, a case where the number of cables is three will be described as an example.
FIG. 2 is a partial cross-sectional side view of the pooling eye with the wire net of the present invention removed, and FIG. 3 is a front view thereof.
In these drawings, a cable clamp 2 is attached to the tip of each of a plurality of cables 1, and each cable clamp 2 attaches the tip of a bolt shaft 3 provided at the tip to the disk portion 4 a of the cable clamp fixing bracket 4. A nut 5 is screwed and fastened to each bolt shaft 3 protruding from the other surface of the disk portion 4a through each of the three holes 4b that are drilled, and fixed to the cable clamp fixing bracket 4. The cable clamp fixing metal 4 is provided with an eye-shaped hook portion 4c for locking a pulling wire (not shown) at the center of one surface of the disk portion 4a, and a reinforcing plate 4d is fixed to one side of the hook portion 4c. ing. Detailed views of the cable clamp fixing bracket 4 are shown in FIGS.

  FIG. 6 is a cross-sectional front view showing a state where each cable clamp 2 is attached to each cable 1. The cable 1 is stripped of the coating at its tip, the core wire 1a is inserted into the tapered hole 2b of the clamp body 2a of the cable clamp 2, and the wedge 6 is driven into the center of the core wire 1a from the opening on the opposite side of the body 2 The opening is closed by screwing the cap 2c with the O-ring 7 interposed. The bolt shaft 3 protrudes from the outer side of the cap 2c, and a nut 5 is screwed onto the bolt shaft 3.

  Next, after fixing the distal end portion of each cable 1 to the cable clamp fixing bracket 4 in this way, as shown in FIG. 1, the cable clamp fixing bracket 4, the cable clamp 2, and the distal end portion of the cable 1 are moved. It is covered with a substantially cylindrical wire net 8. As shown in FIGS. 1 and 7, the wire net 8 has an opening inner diameter of the front end opening 8 a smaller than an outer diameter of the cable clamp fixing bracket 4, and the rear end opening 8 b includes the plurality of cables 1. A number of wires are stretched around the outer periphery of the wire. Specifically, the wire of the wire net 8 is Φ2 mm, and the tip opening 8 a is a ring-shaped member having a Φ50 mm smaller than the outer diameter Φ84 mm of the cable clamp fixture 4.

  As shown in FIG. 8, the pooling eye having the above-described configuration is pulled into the pipe line 10 by hooking the pulling wire 9 to the hook portion 4 c at the tip and pulling the pulling wire 9. As a result, the pulling wire 9, the cable clamp fixing metal 4, the cable clamp 2, and the plurality of cables 1 are pulled in order and pulled inside the pipe line 10. The wire net 8 placed on the wire net 8 is not directly subjected to the tension of the pulling wire 9, but is pulled by the cable clamp fixing metal 4 with its distal end opening portion 8 a locked and pulled. The diameter is slightly reduced by friction, and the cable clamp fixing bracket 4, the cable clamp 2 and the cable 1 are in close contact with each other. Further, as shown in FIG. 8, when the pipe line 10 is bent, the wire net 8 is also wound along the bend of the pipe line 10 and pulled.

FIG. 9 shows a test result in which a cable is drawn into a simulated pipeline using the pooling eye of the present invention and the conventional pooling eye. In the figure, the pooling eye of the present invention is represented by “wire net type”, and the conventional product is indicated as “current product”. The pull-in conditions for this test are as follows.
Pipeline: SVPΦ100 × 10m (tune 5mR)
Cable: CVT 325mm ² x 10m
Pull-in load (back tension): 1200kgf

Referring to FIG. 9, the pulling eye “wire net type” of the present invention has a smaller pulling tension as the pulling length becomes longer than the conventional pooling eye “current product”.
This is because the pooling eye of the present invention only covers the tip of the cable 1, the cable clamp 2 and the cable clamp fixing bracket 4 with the wire net 8, and does not have a conventional steel pipe cap. Since the outer diameter of the portion is not large and thin, and the portion covered by the wire net 8 is freely bent, it has been proved that the cable tip has good passage performance even at the curved portion of the pipeline. .

Further, when drawing a thin and short cable, a cable clamp may not be used as shown in FIGS. 10 and 11 instead of the above embodiment. That is, the tip portions of a plurality of cables 1 are bundled and covered with, for example, a resin cable tip cover 11, the cable clamp fixing metal fitting 4 is applied to the tip of the cable tip cover 11, and the wire net 8 Put on. And the rear-end part 8b of the wire net 8 is fixed to the outer periphery of the several cable 1 bundled.
As a result, the hook portion 4c of the cable clamp fixing bracket 4 is locked through the pulling wire, and when the pulling wire is pulled, the tip opening 8a of the wire net 8 is locked and pulled by the cable clamp fixing bracket 4 and the wire is pulled. Since tension is applied to the wire net 8 and the rear end opening 8b of the wire net 8 is fixed to the cable 1, the outer diameter of the wire net 8 is reduced, and the wire net 8 is in close contact with the outer periphery of the cable 1 and the cable end cover 11. And pinch this. In this way, the cable 1 is pulled.

It is a front view of the pooling eye of the embodiment of this invention. It is a partial cross section side view of the pooling eye which removed the wire net of the embodiment of this invention. It is a front view of the pooling eye which removed the wire net of the embodiment of this invention. It is a front view of the cable clamp fixing metal fitting used for the embodiment of this invention. It is a side view of the cable clamp fixing metal fitting used for the embodiment of this invention. It is a partial cross section front view which shows the state which attached the cable clamp to the cable used for the embodiment of this invention. It is a front view of the wire net used for the embodiment of this invention. It is a front view which shows the state which has drawn in the cable in the curved pipe line using the pooling eye of the embodiment of this invention. It is a graph figure of the simulated pipeline pull-in test of the cable using the pooling eye of the embodiment of this invention and the conventional product. It is a front view of the pooling eye of the other embodiment of this invention. It is a partial cross section front view of the pooling eye which removed the wire net of other examples of this invention. It is a partial cross section front view which shows a conventional product.

Explanation of symbols

1 cable
2 Cable clamp 2a Clamp body
2b Taper hole 2c Cap
3 bolt 4 cable clamp fixing bracket
4a disk part 4b hole
4c Hook part 5 Nut
6 wedge 7 O-ring
8 Wire net 8a Tip opening
8b Rear end opening 9 Pulling wire
10 Pipe line 11 Cable end cover

Claims (1)

In the pooling eye where a plurality of cable ends are fixed or locked to a cable clamp fixing bracket, a pulling wire is hooked on a hook at the tip of the cable clamp fixing bracket, and the cable is pulled into the pipeline by the pulling wire.
A cable clamp is attached to the tip of each cable, and each cable clamp is locked to the cable clamp fixing bracket to bundle a plurality of cables. The tip of the cable clamp fixing bracket, cable clamp, and cable tip end It is covered with a substantially cylindrical wire net whose tip opening inner diameter is smaller than the outer diameter of the cable clamp fixing bracket, and the hook of the cable clamp fixing bracket projects from the tip opening of the wire net,
In the cable clamp, the tip of the cable is passed through the taper hole of the clamp body, a wedge is driven through the opening on the opposite side of the taper hole to fix the cable to the clamp body, and the cap on the opposite opening is covered with a screw. The bolt shaft at the tip of the cap is passed through a plurality of holes drilled in the disk portion of the cable clamp fixing bracket made of a plate body having an outer diameter substantially the same as the outer diameter of the plurality of cables. A wire net type pooling eye for cable pulling, characterized in that it is an assembled prefabricated type in which a nut is screwed onto a bolt shaft projecting from the front end surface of a fixing bracket and fixed.

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