JP3025767B2 - Construction method of spiral support for cable suspension - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for installing a spiral support for hanging a cable on a messenger wire, and a drawstring passing device for drawing a cable into the spiral support.

[0002]

2. Description of the Related Art Conventionally, as a method of hanging and fixing a cable on a messenger wire, a hanger type 100 as shown in FIG. 10 is widely used.
The procedure is, as shown in FIG.
Messenger wire 102 previously stretched between 1b
First, the wheel 121 is attached. After that, tow rope 122
Is connected to the winch 103 through a wheel & pinion 121, and then the cable 114 connected to the tow rope 122 is wound up and drawn between utility poles. Then, while removing the wheel 121, FIG.
, 106 are attached every 50 to 60 cm. However, these operations are all performed by telephone pole 101a.
Since the worker 104 shown in FIG. 11 is to be suspended in the air (referred to as a suspended work) between the time and the time of 〜１０101b, the skill of the worker is required and the construction takes a dangerous time. In addition, during the operation, there has been an accident in which the gold wheel 121 falls and injures a pedestrian, and improvement for this has been strongly desired.

[0003] In addition, when the cable is attached by the hanger, an external factor acts to cause the cable to fall off or to be displaced, thereby impairing proper support of the cable and adversely affecting the characteristics of the cable in some cases.

[0004]

SUMMARY OF THE INVENTION In view of the above circumstances, the present invention relates to a method of constructing a helical support for hanging a cable by a safety method which does not require hanging work, and which does not fall off or laterally displace. An object of the present invention is to provide a drawstring passing device for drawing a cable into a support.

[0005]

According to the present invention, in order to hang a cable on a messenger wire stretched between utility poles, the messenger wire is larger than the sum of the outer diameter of the messenger wire and the outer diameter of the cable near one utility pole. A procedure in which a spiral support having an inner diameter is transferred to the other power pole side while being wound around the messenger wire, and one end of the next spiral support is connected to the other end of the first spiral support by a joint sleeve. And a step of fixing the helical support to the messenger wire with a fixing device when the first helical support reaches the other power pole, and a cable hanging spiral using a drawstring threader. The procedure of drawing the cable into the cable support allows the cable laying work to be performed only near the utility pole. There are, the pull cord insertion tool 17, a pointed conical leading through portion 19 of the above, the leading insertion portions 19
A blade portion 20 formed of a plurality of leaf springs 20a connected to a rear outer periphery of the divergent shape and formed in a divergent shape;
A connecting portion 21 as a connecting tool of the drawstring portion 18 attached to a part of the plurality of leaf springs 20a at a rear side approaching to the messenger wire provided above the connecting portion 21. A coupling portion 22 provided with a longitudinal crack that can be covered from below, and the length L of the leaf spring 20a is set to be longer than twice the pitch P of the spiral support. It is a means of solution.

[0006]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a schematic side view showing one embodiment of a method for installing a spiral support for hanging a cable according to the present invention. FIG. 2A is a side view showing one embodiment of the spiral support used in the construction method of the present invention.
FIG. 2B is a cross-sectional view of FIG. 2A taken along line A-A. FIG. 3 is a perspective view showing one embodiment of a joint state of the joint sleeve according to the construction method of the present invention. FIG. 4 is a sectional view showing an embodiment in which a messenger wire and a cable are wound by a spiral support according to the construction method of the present invention. FIG. 5A is a perspective view showing one embodiment of the joint sleeve used in the construction method of the present invention, and FIG. 5B is a cross-sectional view of FIG. 5A taken along line BB. It is. FIG. 6 is a schematic exploded side view showing one embodiment of the connection and connection of the spiral support.
FIG. 7 is a schematic side view showing a state where one embodiment of the fixture according to the construction method of the present invention is attached. FIG. 8 is a schematic side view showing an example of construction using one embodiment of the drawstring passing device of the present invention. FIG. 9 is a side view showing one embodiment of the drawstring passing device of the present invention.

[0007] As shown in FIG. 1, a messenger wire 2 is previously stretched between winches 3 between the utility poles 1 a and 1 b. The worker 4 rides on the inside of the bucket 5 installed near one of the utility poles 1a to perform the work of installing the spiral support.

Next, as shown in FIGS. 2A and 2B, the spiral support 6 of the present invention is covered with a synthetic resin material 8 around a core wire 7 and has a spiral shape 9 in the longitudinal direction. 75
cm or 100 cm.
Nothing is inserted into one end 10 of the helical support, but it is inserted into the other end 11 by leaving a half of the joint sleeve 12 in advance, and the crimping tool 13 shown in FIG. They are crimped to save time on site. The spiral inner diameter D of the spiral support 6 is, as shown in FIG. 4, larger than the sum of the outer diameter d of the messenger wire 2 and the outer diameter d 'of the cable 14, for example, 2
It is preferably at least 00%.

The joint sleeve 12 used in the construction method of the present invention is as shown in FIGS. 5A and 5B and is made of metal. In the case of this embodiment, aluminum is used. ing. A through hole 15 is formed in the longitudinal direction, and the through hole 15 has a shape conforming to the cross-sectional outer shape of the spiral support 6. In the case of the present embodiment, the through hole 15 is a straight hole, and is crimped in such a manner that the other end 11 of the spiral support 6 of FIG.

First, as shown in FIG. 6, the spiral support 6 is mounted while being wound around the messenger wire 2, and is transferred to the other electric pole 1b. When this transfer reaches the other end 11a of the first spiral support 6a as shown in FIG. 6, half of the through hole 15 of the joint sleeve 12 in FIG. The other end 11a is fitted and crimped to 15a. Therefore, since the inside of the through hole of the remaining half 15b is empty, one end 10b of the second spiral support 6b is inserted and fixed by crimping with the crimping tool 13 shown in FIG. The procedure of repeating the connection by this connection and the previous transfer procedure are repeated, and the mounting of the spiral support 6 is advanced.

When this work is advanced, one end 10a of the first spiral support 6a reaches the position of the other electric pole 1b shown in FIG. The mounting of the spiral supports 6a to 6i (FIG. 7) is completed. At this time, the first spiral support 6a and the last spiral support 6i are fixed to the messenger wire 2 by using fixings 16,..., 16 as shown in FIG. It is desirable that not only one fixing tool 16 but also two or three fixing tools 16 be attached and fixed.

In this state, as shown in FIG.
As shown in FIG. 9, an operator 4 riding on a bucket 5 installed near one of the utility poles 1a within the diameter of the spiral support 6 wound around the messenger wire 2 stretched between 1b, The drawstring portion 18 is pushed in using the drawstring passing device 17.

Here, the structure of the drawstring threader 17 of the present invention will be described in detail. FIG. 9 shows a drawstring portion 18, a leading portion 19, and a wing portion 20 showing one embodiment.
In the case of the present embodiment, the connecting portion 2
1 and a coupling part 22 are provided.

That is, the pulling string passing device 17 of the present invention has a conical leading portion 19 at the tip, a blade portion 20 such as a leaf spring attached at the rear, and a resilient rigid body at the rear end. The drawstring portion 18 is provided.

In the case of this embodiment, the drawstring 18
It is made of synthetic resin (FRP) reinforced by glass fiber of about mmφ. This may be a metal or synthetic resin material-coated product, but is made of a rigid body that can maintain linearity enough to insert the inside of the diameter of the spiral support 6 and has some elasticity. I have.

The connecting portion 21 is a support portion for opening and closing the coupling portion 22 having a vertically split structure, and a sleeve 23 for connecting the drawstring portion 18 made of metal such as stainless steel is provided. In the case of this embodiment, it is attached. The coupling portion 22 is made of a thin metal, and in the case of this embodiment, made of stainless steel.

The drawstring threader 17 has a conical leading end portion 19 at the tip. In the case of this embodiment, it is made of a rocket-shaped metal, but if it has a pointed conical shape,
The shape and material can be appropriately selected. Further, behind the first conducting portion 19, a blade portion 20 such as a leaf spring 20a is attached in a protruding state.

The leaf spring 20a is formed by bending a number of piano wires, is first conductive, is silver brazed to the outer periphery at the rear of the portion 19, and has a rocket-like extension with a wide hem. It consists of several separate assemblies. In the case of this embodiment, the blade portion 20 is composed of four leaf springs, and the upper two blades are provided with a connecting portion 21 near the portion 19 which conducts first. However, the connecting portion 21 may be provided integrally with the leading conducting portion 19 behind the leading conducting portion 19.

Therefore, each leaf spring 20a-2a of the blade portion 20
0a is automatically biased so that when it is inserted into the outer circumference smaller than the outer diameter in the expanded state, the diameter is automatically reduced to a small value, and when it is released, it can rebound again. The outer diameter of the blade portion 20 is at least in the reduced state,
Must be insertable into the inside diameter of the In addition, the length L of the blade portion 20 needs to be longer than at least one pitch length P of the spiral support 6, and preferably has a length of two pitches or more.

In the case of the present embodiment, a coupling portion 22 that covers the messenger wire 2 of FIG. 8 is provided integrally above the connecting portion 21. On the other hand, a pull cord 18 made of a resilient rigid body is provided at the rear end of the connecting portion 21.

The coupling portion 22 of this embodiment has an inner diameter slightly larger than the outer diameter of the messenger wire, and the upper portion is vertically broken, so that it can be easily covered on the surface of the messenger wire 2 from below. Can be done.

The drawstring threader 17 having the above structure
Is inserted into the diameter of the cable-suspending helical support 6 and pressed from the rear, in the case of this embodiment, the coupling 2
2 slides smoothly on the surface of the messenger wire 2 of FIG. In addition, since the leading end of the conducting portion 19 is sharpened, it is possible to make a rush so as to push through the inside of the diameter of the spiral support 6 for suspending the cable, and the blade 20
The outer diameter of the spiral support 6 is reduced along the inner diameter of the spiral support 6, and the drawstring portion 18 is passed through the diameter of the spiral support 6.

When the draw string passing tool 17 reaches the other telephone pole 1b, the cable 14 is attached to the rear end of the draw string portion 18.
(Fig. 1). Then, the drawstring 18 is wound up by the winch 3 shown in FIG. 1, and the cable 14 is drawn into the diameter of the spiral support 6. By the above procedure, the construction method of the present invention can be completed.

In the present embodiment, the cable 14 is directly connected to the drawstring portion 18 of the drawstring passing device 17, but a cable pulling rope is connected, not shown, and the cable 14 is connected to the rear thereof. May be connected and pulled in. In this case, between the power poles 1a to 1b, not shown, and between the subsequent power poles, a pull-in rope is laid between the power poles using the drawstring passing tool 17, and then both ends of each rope are joined. Then, it is possible to pull in a long span at a time.

When the cable 14 is additionally constructed, although not shown, the drawstring threader 17 is inserted into the diameter of the spiral support 6 in which the messenger wire 2 and the cable 14 are already inserted. If it does, it can be constructed similarly.

[0026]

By using the construction method of the present invention and the drawstring passing device of the present invention, there is no need to perform a dangerous suspension work in the air, and all work can be performed near the telephone pole.
The installation work of the spiral support as a cable support is
Now you can do it safely and easily.

Further, according to the construction method of the present invention, the work of mounting and removing the installation jig such as a wheel car at a high place is eliminated.
There is no danger of parts falling for passers-by.

According to the construction method of the present invention, the disadvantages of lateral displacement and falling off are eliminated by the crimp fixing method of the spiral support and the joint sleeve, and by the fixing of the spiral support and the messenger wire by the fixture.

By using the drawstring passing device of the present invention, the cable can be smoothly and quickly drawn into the diameter of the spiral support.

[Brief description of the drawings]

FIG. 1 is a schematic side view showing one embodiment of a method for installing a spiral support for hanging a cable according to the present invention.

FIG. 2A is a side view showing one embodiment of a spiral support used in the construction method of the present invention, and FIG.
It is sectional drawing which cut | disconnected (a) by A-A line.

FIG. 3 is a perspective view showing one embodiment of a joint state of a joint sleeve according to the construction method of the present invention.

FIG. 4 is a cross-sectional view showing an embodiment in which a messenger wire and a cable are wound by a spiral support according to the construction method of the present invention.

FIG. 5A is a perspective view showing one embodiment of a joint sleeve used in the construction method of the present invention, and FIG. 5B is a cross-sectional view of FIG. 5A taken along line BB. .

FIG. 6 is a schematic exploded side view showing an embodiment of the connection and connection of the spiral support of the present invention.

FIG. 7 is a schematic side view showing a state in which an embodiment of the fixture according to the construction method of the present invention is attached.

FIG. 8 shows an embodiment of the drawstring passing device of the present invention.
It is a schematic side view which shows the example of construction.

FIG. 9 is a side view showing an embodiment of the drawstring passing device of the present invention.

FIG. 10 is a schematic exploded side view showing an example of a construction state of a conventional cable hanging hanger system.

FIG. 11 is a schematic side view showing an example of a construction method using a conventional cable hanging hanger system.

[Explanation of symbols]

 1a telephone pole 1b telephone pole 2 messenger wire 3 winch 4 worker 5 bucket 6 helical support 6a first helical support 6b second helical support 6i ith helical support 7 core of helical support Line 8 Synthetic resin covering spiral support 9 Helical shape of spiral support in longitudinal direction 10 One end of spiral support 10a One end of first spiral support 10b One end of second spiral support 11 The other end of the helical support 11a The other end of the first helical support 12 Joint sleeve 13 Crimping tool of the joint sleeve 14 Cable 15 Through-hole of the joint sleeve 15a Half of the through-hole 15b Half of the through-hole 16 Fixed Tool 17 Drawstring passing tool 18 Drawstring part 19 Conical tip conductive part 20 Blade part 20a Leaf spring 21 Connecting part 22 Coupling part 2 3 Sleeve 100 Hanger method 101a Utility pole 101b Utility pole 102 Messenger wire 103 Winch 104 Worker 106 Hanger 114 Cable 121 Wheel wheel 122 Pull rope D Spiral inner diameter of spiral support d External diameter of messenger wire d 'External diameter of cable P spiral Pitch of the support

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-48-36694 (JP, A) JP-A-6-189424 (JP, A) JP-A-63-18911 (JP, A) JP-A 61-18941 262011 (JP, A) (58) Fields surveyed (Int. Cl. ⁷ , DB name) H02G 1/02-1/08

Claims (1)

(57) [Claims] A helical support having an inner diameter larger than the sum of the outer diameter of the messenger wire and the outer diameter of the cable near one power pole in order to suspend the cable from the messenger wire stretched between the power poles. A procedure of transferring the other spiral support to the other end of the first spiral support with a joint sleeve, and a procedure of repeating connection of the other spiral support to one end of the first spiral support with a joint sleeve while being wound around the messenger wire; Fixing the helical support to the messenger wire with a fixing device when the support reaches the other power pole, and pulling the cable into the helical support for hanging the cable using a drawstring passer In the method for installing a helical support for suspending a cable, the cable laying work being performed only in the vicinity of a power pole according to the procedure, 7 is a pointed conical leading portion 19, a blade portion 20 formed of a plurality of leaf springs 20 a connected to the outer periphery at the rear end of the same leading portion 19 and formed in a divergent shape, and the leading conducting portion 19. A connecting portion 21 as a connecting tool of the drawstring portion 18 attached to a part of the plurality of leaf springs 20a at a rear side approaching to the messenger wire provided above the connecting portion 21. And a coupling portion 22 having a longitudinal split that can be covered from below, and the length L of the leaf spring 20a is set to be longer than twice the pitch P of the spiral support. A method for constructing a spiral support for suspending a cable.