JPH02202319A - Cable anchoring device - Google Patents

Abstract

PURPOSE:To increase the cable grasping force and to fix a device well corresponding to the cable laid condition by constituting a cable anchoring device by an abutting metal fitting that abuts against a conduit line inlet, a flange and a means to hold a cable. CONSTITUTION:A cable anchoring device is composed of an abutting metal fitting 31 brought into contact with the inlet of a conduit tube 3 of a manhole and a main body section provided through an adjustment means. The adjustment means is composed of a plurality of anchor bolts 35 and spring members 36 between the abutting metal fittings 31 and a flange 32, which can be slided along the bolt 35. A plurality of metal tape members 45 are fitted nearly in spiral to the flange 32. A cable 1 is surrounded by a packing member 47 and inserted into the flange 32 and the metal tape member 45 nearly in spiral. Around the metal tape member 45 a clamping member 40 and a ring-shaped spring 43 are wound and fixed to the flange 32.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a cable retaining system used to prevent cables installed in a conduit from moving due to wave-riding phenomena or from thermal expansion and contraction caused by load current, temperature changes, etc. Regarding equipment.

(Prior art) Generally, power transmission/distribution cables, paper cables, etc. (hereinafter referred to as cables) are often laid in conduits installed under roads, etc. As shown in FIG. 6, a conduit 3 is connected through a manhole 5, a cable 1 is laid inside the pipe, and the cable is connected through a connecting part 2 at the manhole 5. That's what I do. In addition, a slight margin (offset) is formed in the front and rear portions of the connecting portion 2, so that the cable can be connected smoothly.

However, if the ground on which the cable is laid is not in good condition, a wave-riding phenomenon may occur due to images taken by vehicles traveling on the road, and the laid cable may move in the direction of vehicle travel. Problems such as movement may occur.

As shown in FIG. 7, the surfing phenomenon occurs when a pressing force f is applied by the shape of a vehicle 7 traveling on a road 6, causing the conduit 3 to bend and sink. As the vehicle moves in the direction of travel (■), the bent portions will move one after another, and in accordance with the bending of the conduit, a force will be applied to move the cable 1 little by little in the direction of arrow V. become.

The phenomenon of cable movement as described above is called wave-riding phenomenon, and in order to prevent such wave-riding phenomenon from occurring, cables are installed on both sides of the conduit as shown in Figure 8. At the manhole 5.5a, the cable restraint device 10 is installed at both ends of the conduit 3 with respect to the cable 1.
．． Providing means for fixing using 10a is carried out.

Specifically, as a means to prevent cable movement due to the above-mentioned wave riding phenomenon,
Cable movement prevention means such as those disclosed in Japanese Utility Model Publication No. 668 and Japanese Utility Model Publication No. 56-753 are used. In addition, in the conventional example, a fixing means for the feeding end of the cable is arranged at the connection part of the conduit to the manhole to prevent the cable from being drawn into the conduit from the manhole even if a wave riding phenomenon occurs. It can be prevented.

In addition to the general cable restraint device as described above, as a conventional cable restraint device, for example, a cable restraint device 10 as shown in FIG. 9 may be used. In the cable restraint device 10 shown in FIG.
1, an end plate 19 is provided at the other end, and a plurality of bolts 12, 12... are arranged at equal angles between both members, and the bolts are movable along these bolts. In the state
A fixing means using a clamp and a holding means using a spring member are provided.

These cable retaining means, as shown in FIG.
．． 21a, and the clamp member is tightened by a pressing member 25 via flanges 23 on both sides of the clamp member, so that the cable can be fixedly held.

In addition, when holding the cable with the clamp member 21.21a, with respect to the bolt 26 of the pressing member 25,
On the outside of the flange, use a nut 27 to tighten the spring member 2.
8 to press it. By pressing with spring members from both sides of the clamp, the two can be fixed together inside the clamp 20 via a packing 24 that covers the outside of the cable.

The clamp 20.20a having the above-mentioned configuration is used, and the middle flange 14 is provided in the middle portion thereof, and these clamps are provided integrally with the middle flange 14 so as to be slidable with respect to the bolt 12.

Furthermore, end flanges 13, 18 are arranged on both sides of the means for retaining the cable by said clamp, which end flanges are fixed to the bolts 12, and between said end flanges and the middle flange are each provided with a spring. Elements 15, 17 are arranged such that their spring elements act as compression spring element 15 and tension spring element 17.

Therefore, as described above, the cable restraint device 1
If a cable held at 0 is subjected to an action such as bowing toward the conduit side or an action such that it is pushed out, the cable will be unwound even if a force is applied in either direction. It is possible to prevent the pipe from curling or bowing, and it is possible to deal with the waving phenomenon within the pipe.

(Problems to be Solved by the Invention) However, in the conventional cable restraint device as described above, the number of members constituting the device is large;
Also, the mechanism of each component is complicated, and it is extremely troublesome to assemble these members and fix the cable to the entrance of the conduit inside a narrow manhole. There was a problem.

In addition, since the cable holding mechanism by the clamp relies only on the suppressing action from above and below by the clamp member, it is difficult to maintain a constant cable holding performance by the clamp, and there are drawbacks such as insufficient gripping force. Therefore, it was difficult to demonstrate sufficient performance.

In addition to the drawbacks mentioned above, when cables are fixedly held in manholes, they are often arranged in a curved shape, whereas the configuration of conventional cable restraint devices is However, in order to fix the end of the cable with the cable restraint device, it is necessary to make the manhole large.

(Objective of the Invention) The present invention eliminates the drawbacks of the conventional cable restraint devices as described above, and is capable of increasing the cable gripping force and fixing the cable in the required installation state (straight, curved, etc.). ) and to provide a device that can be used in good condition.

(Means and effects for solving the problems) The present invention has the following features:
A cable restraining device configured to hold a cable installed in a conduit at the end of a conduit mouth such as a manhole, which includes an abutment fitting that comes into contact with the conduit entrance, and a butt fitting for the abutment fitting. a flange provided via a spring member;
and means for holding a cable arranged from the flange to the manhole side. The means for holding the cable includes a packing member that covers the cable, a plurality of metal tape members arranged diagonally around the packing member, and
It consists of a clamp member for tightening on a surface perpendicular to the length direction of the cable on the outside of the metal tape member, and a ring is attached to the clamp member through a groove provided around the clamp member. A shaped spring is provided.

Therefore, in the cable anchoring device of the present invention, each component is constructed to be relatively easy to handle, and its assembly work can be easily performed.

And, for the tension etc. applied to the cable, a large number of gold JmI! Since the metal tape member and the clamp member are fixed without sliding, the holding action on the cable is performed accurately and the cable is held securely. This makes it possible to counteract the rippling phenomenon.

(Example) The configuration of the cable anchoring device of the present invention will be described according to the illustrated example.

In the embodiment of the present invention shown in FIG. 1, a cable restraint device 30 is applied in response to a case where a cable (electric cable, communication cable) 1 extends straight from a conduit 3h1 toward a manhole. This shows the configuration of the case. The cable restraint device 30 shown in FIG. 1 is composed of an abutment fitting 31 that comes into contact with the mouth of the conduit 3 of the manhole, and a main body portion that is provided to the abutment fitting 31 via an adjustment means. Ru.

The adjustment means includes the abutment fitting 31 and the flange 3 of the main body.
2 and the spring member 3.
6, and a plurality of these members are provided at equal angles in the circumferential direction of the flange.

Further, the retaining bolt 35 is provided with a spring member adjustment fitting 37 at the end that passes through the flange 32, and by moving the fitting 37 along the retaining bolt,
The movement range of the flange 32 with respect to the abutment fitting 31 can be set arbitrarily.

The flange 32 has a through hole in the center for passing the cable through, and is divided into two parts so that it can be attached to the cable from both sides. A connecting fitting 33 is used to join the two flange members.

A plurality of metal tape members 4 are attached to the flange 32.
5 is attached by means such as welding.

This metal tape member 45 is constituted by a tape-shaped member made of stainless steel, and in the embodiment of the present invention, the thickness is 1#, so the width is about 10 m. The end portion is held by welding around the hole, and as shown in the figure, it is arranged substantially spirally at an angle of 5 to 20 degrees with respect to the length direction of the power cable. In addition, when this tape is arranged at an angle of inclination of about 10 degrees, it is possible to exhibit good performance in fixing and holding other members through the tape, and Workability such as fixing work can be improved.

The cable 1 supported by the main body of the cable restraint device 30 of the present invention is attached to a packing member 4
7, a metal tape member 45 is wound approximately spirally around the packing member, and a clamp member 40 is arranged around the gold 11 tape member. A ring-shaped spring 43 is arranged around the clamp member.

The packing member 47 is made of neoprene rubber or the like, and has a hole formed in its center for the cable to pass through. In order to easily attach the packing member to the cable, the packing member is formed into a half-split shape or other divided shape, so that it becomes cylindrical when attached to the cable. It can be configured as follows.

The clamp member 40 of the present invention described above is made of aluminum alloy or the like, and is formed by combining four clamp pieces 41 as shown in FIG. 2, and these clamp pieces form a substantially annular clamp member. configured. Then, by tightening the clamp member from the outside with a ring-shaped spring 43, the cable is tightened via the gold till tape member and the packing member.
The cable and the cable restraint device are fixed.

In the cable restraint device of the present invention, the clamp member is made of aluminum alloy or the like, and as shown in the figure, five clamp members designated by numerals 40 to 40d are provided at predetermined intervals. .

For example, by setting the holding force of each clamp member to 40 Ky, it is possible to correspond to the tension applied to the cable up to a range of 200 Ky, and to correspond to the tensile force by these clamp members. be made into Note that the bent portion 46 is formed at the end of the metal tape member, which is used not only to lock the end of the packing member but also to prevent the end of the metal tape member from protruding. It is supposed to be prevented.

Further, a concave groove 42 is provided around the clamp member.
is provided, and a ring-shaped spring 43 is configured to be locked to the groove 42. This groove 42 is provided to prevent the ring-shaped spring 43 from coming off the clamp member and to ensure good tightening action.

In addition, the spacing between each clamp member of the present invention is set to such an extent that the metal tape member does not buckle at its exposed portion when a force is applied in the direction of compressing the main body. , the interval is arbitrarily set according to the strength of the metal constituting the metal tape member.

Cable restraint device 3 of the present invention configured as described above
0, the metal tape member arranged in the length direction of the cable restraint device and the clamp member provided around it are such that the contact surface between aluminum and stainless steel is prevented from slipping due to mutual friction between the metals. It is designed to be fixed and held in such a way that it will not cause any damage.

Therefore, unless a force greater than the set holding force is applied, each metal tape member will not slide against the clamp member, and the cable restraint device will effectively hold the cable. It will be possible to do so.

Another embodiment of the cable restraint device of the present invention shown in FIG. The present invention relates to a cable restraint device for holding cables.

In the cable restraint device 50 shown in FIG. 3, the shape of the adjusting means provided between the abutment fitting 51 and the flange 52 is simplified compared to the embodiment shown in FIG. There is.

The adjustment means includes a spring member 56 disposed between the abutting metal fitting and the flange, which is provided on the bolt 55, the tip of the bolt is screwed to the abutting metal fitting 51, and the other end is screwed to the abutting metal fitting 51. The flange is slidable, and a nut 57 is attached to the end so that the flange can be slid along the bolt.

Further, a metal tape member 65 attached to the flange 52,
The packing member 67 and the like are configured similarly to the example shown in FIG. 1, but when the clamp member 60 is viewed from the side as shown in FIG. A substantially tapered structure with a narrow width is used.

The clamp member shown in FIG. 4 is constructed in the same manner as the example shown in FIG. 2, and as shown in FIG. The provided ring-shaped spring 63 tightens the cable-covering member 67 via the clamp member to fix the cable.

As described above, a large number of clamp members each having a substantially tapered shape are attached at predetermined intervals, as shown by reference numerals 60 to 60G in FIG. Then, the clamp member is fixed to the metal tape member 65 arranged in a substantially spiral shape in a slightly inclined state.

As described above, since the clamp member is constituted by a plurality of clamp pieces, and the tightening action is performed by the ring-shaped spring from the periphery, the cable restraint device of the present invention has the structure shown in FIG. As shown, the clamp piece allows a pressing force to be applied from around the cable. The holding force against the cable is such that it is possible to press each member with a much larger force than the conventional method of pressing from above and below.

Therefore, in the device of the present invention, compared to conventional cable restraint devices, it is possible to set a larger holding force per unit length of the clamp member, so even if the holding force for the cable is the same, This makes it possible to narrow the width of the clamp member provided around the cable.

(Effects of the Invention) Since the cable restraining device of the present invention has the above-described configuration, it is possible to configure the cable restraining device as a small device, and the ease of handling and assembling thereof can be improved. It works well and makes it easy to fix cables inside narrow manholes.

Therefore, in the cable restraint device of the present invention, each component is constructed to be relatively easy to handle, and its assembly work can be easily performed.

A large number of metal tape members can resist the tension applied to the cable, and the metal tape member and the clamp member do not slide. Since the cable is fixed in place, the cable can be held in place accurately, and cable waving can be counteracted.

[Brief explanation of the drawing]

FIG. 1 is a side view showing the configuration of the cable anchoring device of the present invention, FIG. 2 is a sectional view thereof, and FIG. 3 is a side view showing an example of the case where the cable anchoring device of the present invention is provided at a bent portion of a cable. Fig. 4 is a side view of the clamp member, Fig. 5 is an explanatory diagram showing the effect of tightening by the clamp member of the present invention, Fig. 6 is an explanatory diagram of the state of cable installation, and Fig. 7 is an illustration of the waving that occurs in the cable. FIG. 8 is an explanatory diagram of the cable undulation prevention means, FIG. 9 is an explanatory diagram of a conventional cable restraint device, and FIG. 9a is a front view of the clamp member. Codes in the diagram: 1... Cable, 3... Conduit, 5...
... Manhole, 10, 30, 50 ... Cable restraint device, 20 ... Clamp, 40, 6
0...Clamp member, 11/31/51...
...Butting metal fitting, 32, 52...Flange, 42, 62...Concave groove, 43, 63...
・Ring spring, 45.65... Gold 1iRII
Tape member, 47/67...Packing member. Figure 6

Claims (1)

[Scope of Claims] A cable restraining device for holding a cable installed in a conduit at the end of a conduit mouth such as a manhole, comprising: an abutting metal fitting that abuts against the conduit mouth; and the abutment metal fitting. a flange provided via a spring member to the flange;
means for holding a cable arranged from the flange to the manhole side, the means for holding the cable comprising: a packing member covering the cable; and a plurality of packing members disposed diagonally around the packing member. It consists of a metal tape member, and a clamp member for performing a tightening action in a plane perpendicular to the length direction of the cable outside the metal tape member, and the clamp member is provided with a A cable retaining device characterized in that a ring-shaped spring is provided through a concave groove.