JPH0424922B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for tensioning ropes, etc., which is mainly used when installing or relining power transmission lines, and a wire tensioning machine used therein.

For example, during construction work such as new installation or re-lining of power transmission lines, the wires are stretched to a predetermined length using equipment such as a wire tensioner or winch in order to take up the slack due to stretching of the wires or ropes strung between steel towers. The only thing that will be done is to pick up the item.

However, in the past, a clamping device was used to clamp and pull the rope itself.
The problem was that if the grip was not enough, the rope would slip, or if the rope was tightened too much, the rope would be damaged, making the work extremely difficult. In addition, when taking over the rope itself, it is essential to wind it up with a winch on the ground as a back-up, which not only requires a large number of people, but also the installation of the winch and the wiring work when passing the winding rope through the steel tower. The process was extremely complicated.

Furthermore, although the length of the rope to be pulled is determined in advance according to the rope's elongation rate, it is difficult to measure the length of the rope to be pulled because the site is often located on a steel tower.

This invention focuses on these points, and makes it possible to reliably and easily take up the workpiece, eliminates the need for winding up with a winch on the ground as a back-up process, and allows you to see the retracting distance at a glance.
This is an attempt to propose a completely new method of tension management.

The tensioning method of the present invention uses a tensioning rope in which truncated conical mooring portions are integrally formed at regular intervals on a rope main body having a small elongation rate, and attaches the wire body to the tensioning rope to the tensioning rope. A wire tensioning method characterized in that the large-diameter side of the mooring section is connected so that it is the receiving side, and a wire tensioning machine of a predetermined length is created by fitting the mouthpiece of a wire tensioning machine to the mooring section and pulling it. Pertains to. .

Further, another invention shown here relates to a wire tensioning machine used in the above-mentioned wire tensioning method, and has two cap pieces that can be opened and closed, and the cap pieces have a truncated conical shape inside when they are joined together. It is characterized in that it forms a grip part and is provided with a tensioning pull member on the outside of each piece.

Embodiments will be described below with reference to the accompanying drawings.

Fig. 1 is an overall perspective view with some parts omitted showing an example of a tensioning rope used in the present invention, Fig. 2 is an enlarged sectional view of its main parts, and Fig. 3 is an essential part showing the state in which the rope is stretched. Figure 4 is a perspective view of the wire tensioning machine, Figure 5 and the following are schematic explanatory diagrams showing how to tighten ropes during power transmission line re-stretching work, and Figure 5 is a diagram showing how to stretch ropes between steel towers. State side view, 6th
The figure is a side view showing the preparation state of the tension line, and FIG. 7 is a side view of the tension line state.

In this invention, as shown in FIG.
In each case, a tension rope 10 having a truncated conical mooring portion 30 integrally formed therein is used. The tensioning rope 10 of the example had a total length of 20 m, and truncated conical mooring parts 30, 30... having tapered surfaces for stopping a wire tensioning machine, which will be described later, were formed at regular intervals of 2 m. It is something. Reference numerals 18 and 19 are loop portions for connecting terminals.

The rope main body 11 is a fiber rope used for this type of electrical work, and as shown in FIG. 2, the outside of a braid 12 made of polyaramid fiber or the like having a small elongation rate is covered with an insulating protective coating layer 13 of polyurethane resin. is preferably used.

As shown in FIG. 2, the mooring portion 30 is formed by inserting a bulge forming member, for example, a coil spring 20 as in the embodiment, into the braid 12 of the rope main body 11 to form a bulge 15. The entire projecting portion 15 is integrally covered with a plastic 25 such as epoxy resin, and its outer surface is tapered to serve as a mooring portion 30 for retaining the wire tensioner 40.

The reason why the bulge forming member 20 is inserted into the braid 12 of the rope body 11 to form the bulge 15 is to maintain firm integrity between the plastic 25 and the rope body 11. By adopting such a configuration, even when the mooring portion 30 is strongly pulled by a wire tensioning machine, the rope is prevented from coming off.

The mooring part 30 can be formed of the plastic 25 itself (so-called integral molding), or it can be made of a cylindrical member 31 molded from a strong resin such as nylon or polyacetal resin as in the embodiment. Using the above plastic 25
They may be joined together by. In FIG. 2, numeral 32 is an anchor groove for realizing a stronger integral bond with the inner plastic layer 25 to be filled, and 35 is a glass fiber sheet for reinforcing the plastic layer itself.

The mooring part 30 has a truncated conical outer shape because
As shown in FIG. 3, a wire tensioning machine 40 having a corresponding clamping space, that is, a grip part, was fitted onto the tapered surface of the mooring part 30 so that the larger diameter side of the tapered part was the receiving side, and the wire was pulled. In some cases, the grip section of the wire tensioner 40 can be securely attached to the entire tapered surface of the mooring section 30, and the tensile force of the wire tensioner 40 is evenly distributed over the entire tapered surface. Therefore, partial concentration of stress can be avoided, and as a result, it can be pulled with a larger force.

Here, the wire tensioning machine 40 shown in FIG. 4 will be explained.
Two cap pieces 4 configured to be able to be opened and closed freely by
1 and 42, and the cap pieces 41 and 42 form a truncated cone-shaped grip portion 45 inside when they are joined together, and a tensioning pull member 46 on the outside of each piece.
47 is provided. Reference numeral 44 is a fixing member consisting of a connecting bolt and nut, and 48 and 49 are flange portions for engaging the pulling member.

Next, the actual wire tensioning method of the present invention will be explained with reference to FIG. 5 and the following figures. These represent the re-stretching work of the power transmission line 50, in which the guide rope indicated by the reference numeral 60 is used as the wire body to be tensioned.

First, as shown in FIG.
56... are arranged together with the guide rope 60. This guide rope 60 has a length calculated in advance from the span distance and the elongation rate of the rope, and the tension rope 10 is connected to the end of this rope 60. In addition, at this time, the large diameter side of the mooring part 30 of the tensioning rope 10 is the receiving side (in the figure, the steel tower 51
side).

FIG. 6 shows a state in which the arrangement of the metal wheel 56 between the steel towers has been completed, and the guide rope 60 is stretched with some slack due to its own stretching. Then, in order to take up the slack in the rope 60, the base of the wire tensioner 40 is fitted into the mooring portion 30 of the tensioning rope 10 connected to the rear end of the rope 60. At this time, the length of the rope taken up by the tensioner 40 is predetermined according to the slackness of the rope 60, and the cap of the wire tensioner is fitted into the mooring portion 30 corresponding to the taken-up length.

Next, the tensioning rope 10 is pulled through the tensioning member of the tensioning machine 40, and the guide rope 60 is tensioned by a predetermined length. Guide rope 60
Due to the tension, the metal wheels 56, 56, . . . arranged on the electric wire as shown in FIG. In this state, the wire is replaced with a new one.

According to the method of this invention, as is clear from the above example, the wire can be reliably tensioned simply by fitting the mouthpiece of the wire tensioning machine into the mooring portion of the wire tensioning rope and pulling it off. In particular, as mentioned above, this invention uses a tension rope in which truncated conical mooring parts are integrally formed at regular intervals on the rope main body.
When a wire tensioning machine having a grip part corresponding to the tapered surface of the mooring part is fitted and pulled so that the large diameter side of the tapered part is the take-up side, the grip part of the wire tensioning machine securely covers the entire tapered surface of the mooring part. Moreover, since the tensile force of the wire tensioning machine is distributed and carried over the entire tapered surface, partial concentration of stress can be avoided, and as a result, the wire can be pulled with a larger force.

Therefore, unlike when the rope itself is pinched and pulled using a conventional pinching device, there is no possibility of the rope slipping or damage to the rope caused by over-tightening the rope, and at the same time, the pulling force is sufficient. This eliminates the need for winding up with a winch on the ground as a back-up process, which brings an extremely large advantage in terms of personnel and wiring work.

Furthermore, the length of the rope to be pulled can be seen at a glance by the mooring portions formed at regular intervals, and the present invention can greatly contribute to improving the efficiency of this type of wire tensioning work.

[Brief explanation of drawings]

Fig. 1 is an overall perspective view with some parts omitted showing an example of a tensioning rope used in the present invention, Fig. 2 is an enlarged sectional view of its main parts, and Fig. 3 shows the state in which the rope is pulled. Figure 4 is a perspective view of the main parts, Figure 4 is a perspective view of the wire tensioning machine, Figure 5 and the following are schematic explanatory diagrams showing how to tighten ropes during power transmission line re-stretching work. Side view of passing state, No. 6
The figure is a side view showing the preparation state of the tension line, and FIG. 7 is a side view of the tension line state. 10...Tension rope, 11...Rope main body,
30... Mooring part, 40... Wire tensioning machine, 45... Grip part, 50... Electric wire, 60... Guide rope (wire body to be tensioned).

Claims (1)

[Scope of Claims] 1. Mooring the wire body under tension to the tension rope using a tension rope in which truncated conical mooring portions are integrally formed at regular intervals on a rope main body with a small elongation rate. A wire tensioning method characterized in that the large diameter side of the mooring section is connected to the pulling side, and a wire tensioning machine of a predetermined length is made by fitting a mouthpiece of a wire tensioning machine into the mooring section and pulling the wire. 2. It has two cap pieces that can be opened and closed, and when the cap pieces are joined, they form a truncated cone-shaped grip part inside, and a tensioning pull member is provided on the outside of each piece. wire tensioning machine.