JP2007221949A - Construction method for executing electric-wire transfer of overhead transmission line while always applying constant load, and constant load mounting device used for the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To achieve assurance of work safety and power saving, while stabilizing behavior of an electric wire by automatically adjusting the excess and deficiency of the electric wire during wire-transfer by always imparting a constant load to the electric wire to be transferred. <P>SOLUTION: A construction method for executing electric-wire transfer of an overhead transmission line is constituted with one end of a wire rope 10, connected to one end part of the fixed side of the electric wire 4 to be transferred and the other end of the wire rope 10 connected to a constant load loading body 11 provided near the ground via a steel tower 1; applying a load to the electric wire desired to be transferred by the load loading body 11, executed by always applying a fixed load matching the tensile force calculated from a distance between the steel towers, the deflection distance of the electric wire, and the unit weight of the electric wire and by controlling normal/reverse rotation of an electric motor of a wire rope winding reel so that the wire rope load of the wire rope 10, connected to the electric wire 4, always becomes equal to the fixed load. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  This invention always defines the wire to be transferred in the wire transfer work for the overhead power transmission line, that is, in the transfer work in which the wire attached to the steel tower is mainly transferred to another steel tower or a raised steel tower. The present invention relates to a method for transferring a wire while applying a load, and a constant load loading device used for the transfer method.

  In the above transfer work, an excess or shortage of the wire length occurs due to a change in the distance between the attached wires (hereinafter referred to as span length). For this reason, when the number of electric wires is insufficient, the electric wire tension increases, and when the electric wires become surplus, the electric wires hang down. Therefore, conventionally, in order to adjust the state of the electric wire (tension and the amount of droop) in the transfer operation, as shown in FIG. While visually confirming the above, the wire was sent and wound by a winch, and the wire was transferred while adjusting the excess or deficiency of the wire.

However, in recent years, in the construction work of overhead power transmission lines, in cases where the work is not allowed to droop or overtension to some extent, such as work above important horizontal objects such as railways or conditions close to the charging section. There are many. Conventional feeding and winding work by winch at the end of the electric wire requires synchronism with the movement of the electric wire on the transfer side. It was time consuming and time consuming. Moreover, human troubles such as poor synchronization due to operator contact mistakes and operation mistakes may occur. In addition, it is necessary to install a protective net at the location so that the electric wire hangs down and does not come in contact with workpieces or pedestrians on the ground.

  The present invention has been made in view of these points. By always applying a constant load to the wire to be transferred, the excess or deficiency of the wire being transferred is automatically adjusted to stabilize the behavior of the wire. Accordingly, the present invention is intended to solve the above-mentioned problems by providing a construction method that realizes safety and labor saving and labor saving of the work and a constant load loading device used in this construction method.

  Usually, the electric wires of the overhead power transmission line are installed at 20000N to 40000N. Therefore, in principle, a weight of 2000 kg to 3000 kg is required. This increases the weight of the weight, impairs workability at the time of handling, and increases the load loaded on equipment such as a steel tower that suspends the weight. Therefore, it is conceivable to reduce the necessary weight weight by the principle of the pulley. However, the weight moving distance in this case increases in inverse proportion to the reduction in load. FIG. 11 shows the relationship between the load P and the moving distance of the weight W. FIG. 11A shows the case where the moving distance of the weight W with respect to the load P is L, whereas the pulley semi-set is used. As shown in FIG. 11B, the load of the weight W is P / 2, but the moving distance of the weight W is L × 2. Therefore, if the load P of the weight W is reduced to 1/5, the moving distance of the weight W is increased by a factor of 5, and this requires a considerable height for the equipment (steel tower) for suspending the weight W. To solve this problem, we developed a constant load loading device consisting of a wire winder that can load a wire rope with a constant load similar to the weight.

  However, as shown in FIG. 12, when a wire rope is wound around a bobbin, the wire winding machine usually changes its winding diameter. Therefore, when the bobbin is rotated with a constant torque, the load on the wire rope changes. Therefore, a method of detecting the winding diameter of the wire rope and adjusting the winding torque so that the tension of the wire rope becomes constant was adopted.

  Specifically, the invention of claim 1 is the load loading provided in the vicinity of the ground by connecting one end of the electric wire to be transferred to the upper end of the steel tower to be transferred and passing the other end through the steel tower near the electric wire. In the wire transfer method of the overhead power transmission line that transfers the electric wire while applying a load to the electric wire to be transferred by connecting to the body, the method of applying the load to the electric wire to be transferred by the load loader is The constant load corresponding to the tension calculated from the distance between the wire, the bending distance of the wire, and the unit weight of the wire is constantly applied, and the constant load is the wire rope load of the wire rope connected to the wire and the constant load. However, the method of transferring the overhead power transmission line while constantly applying a constant load was performed by controlling the forward / reverse rotation of the electric motor of the wire rope take-up reel with a computer so as to be always equal. According to a second aspect of the present invention, in the computer control of the first aspect, the forward / reverse rotation of the electric motor of the wire rope take-up reel is controlled by a computer so that the wire rope load and the constant load are always equal. The construction method for transferring the overhead power transmission line while applying a constant constant load according to claim 1 is incorporated.

  According to a third aspect of the present invention, a reel around which one end of a wire rope is wound is rotatably provided, a rotary drive device that rotationally drives the reel is provided, and tension is applied to the wire rope led out from the reel by the rotary drive device. And a speed sensor that detects the moving speed of the wire rope is provided, and the wire rope moving speed detected by the speed sensor is compared with the rotating speed of the rotary drive device to detect the winding diameter of the wire rope. Then, based on this winding diameter, the rotational torque of the rotary drive device is calculated from the constant load value obtained by the method of claim 1 to be loaded on the wire rope, and the rotational direction and rotational torque of the rotary drive device are calculated. The constant load loading device used in the method of claim 1 is controlled.

According to a fourth aspect of the present invention, a reel around which one end of a wire rope is wound is rotatably provided, a rotary drive device that rotationally drives the reel is provided, and tension is applied to the wire rope led out from the reel by the rotary drive device. And a load sensor for detecting the tension of the wire rope is provided, and the load value of the wire rope detected by the load sensor is compared with the constant load value obtained by the method according to claim 1. Thus, the constant load loading device used in the method according to claim 1 is configured to control the rotational direction and the rotational torque of the rotary drive device so that these load values are always the same. The invention of claim 5 is a computer device that automatically performs various controls in the constant load loading device of claims 3 to 4.

  According to the inventions of claims 1 and 2, during the transfer of the electric wire, the electric wire length is insufficient and the electric wire tension increases, or conversely, the electric wire becomes excessive and the electric wire tends to hang down. Since a constant load calculated from the distance between steel towers, the bending distance of the electric wire, and the unit weight of the electric wire is always applied to the electric wire, the electric wire length is automatically adjusted, and the load of the electric wire does not increase or sag. Therefore, stable work can be realized. Therefore, it is possible to prevent human troubles such as over-tension and abnormal drooping of wires due to mistakes in communication with each work place as in the past, and it is safe even when working over important overpassed properties such as railways and main roads. Can be secured. In addition, since the state of the electric wire is automatically adjusted, the continuity of the work is increased as compared with the adjustment by the worker, the working time can be shortened, and the construction cost can be reduced. Further, since no abnormal drooping of the electric wires occurs, it is not necessary to put a protective net under these electric wires, and the construction cost can be reduced. In addition, it has become possible to work at night when it is difficult for an operator to visually check the state of the electric wire. This makes it possible to avoid serious disasters by performing work at night in places that have a great social impact when trouble occurs, such as work over the railway. Moreover, in the conventional construction method, it is necessary to communicate frequently between workers at each work location. However, since the communication method uses a radio or a loudspeaker, the surroundings of the site are very noisy. However, since this method does not require frequent contact, noise can be reduced.

  Further, in each of the inventions of claims 3, 4 and 5, a tension is always applied to the wire rope led out from the reel, and the movement of the wire rope is detected by a sensor, and the forward / reverse rotation of the rotation driving device of the reel, or By controlling the rotational torque, the load related to the wire rope can always be efficiently held. In addition, since the wire rope is wound around the reel by the rotary drive device or moved out from the reel, the wire rope can be processed instantaneously even if the moving distance of the wire rope is long. Therefore, even when a high load is required, a multistage semi-assembly can be performed.

  By connecting one end of the wire to be transferred to the upper end of the steel tower to be transferred and connecting the other end to the load carrying body provided near the ground via the steel tower near the wire, the wire to be transferred In the wire transfer method of an overhead power transmission line that transfers the wire while applying a load to the wire, the load applied to the wire to be transferred by the load carrying body is the distance between the towers, the bending distance of the wire, and the wire A constant load corresponding to the tension calculated from the unit weight of the wire rope is constantly applied, and the constant load is such that the wire rope load of the wire rope connected to the electric wire is always equal to the constant load. The electric transmission line of the overhead power transmission line is transferred while constantly applying a constant load. As a result, the length of the wire automatically transferred is adjusted, and during the transfer, the wire length is insufficient and the tension of the wire is increased, or the wire is excessive and the wire does not hang down, Work safety and labor saving can be realized.

The present invention will be described below with reference to the drawings.
1 and 2 are schematic configuration diagrams of the construction method of the present invention. When one end of the electric wire 4 attached to the three steel towers 1, 2, and 3 is transferred from the steel tower 3 to the steel tower 5, the electric wire The support of the steel towers 1, 2 and 3 of the steel tower 4 is removed, and the electric wire 4 is moved to the gold wheels 6 and 7 attached to the steel towers 1 and 2. Then, one end of the electric wire 4 attached to the steel tower 3 is moved to the steel tower 5. At that time, as shown in FIG. 2, two wire ropes 8 and 9 are connected to one end of the transfer of the electric wire 4, one rope 8 is supported on the steel tower 3, and the other rope 9 is transferred. The wire 4 is transferred while being supported on the previous steel tower 5 and stretching one rope 8 while pulling the other rope 9. Further, at the time of this transfer, one end of the wire rope 10 is connected to the end of the wire 4 on the fixed side, and the other end of the wire rope 10 is connected to a constant load loading body (however, in FIG. 1 and FIG. Display) 11 is connected. Thereby, during the transfer of the electric wire 4, the electric wire 4 increases in tension and goes upward, or on the contrary, the tension is weakened and tends to be greatly loosened. Does not rise abnormally or sag.

The constant load on the constant load load body is determined as follows. FIG. 3 shows a state in which the electric wire 4 is bent and strained by a distance D from the upper end of the tower at a distance S between the towers. In the case of the unit weight w of the electric wire 4, the tension T applied to the electric wire 4 is expressed by the following equation (1) in the technical field:
T = wS ² / 8D (1)
It is known that The tension T is equal to the constant load in FIG.
Therefore, when the constant load in FIG. 1 is known in advance, the distance S between the tower 5 and the tower 2 is known, and if the distance D for bending the electric wire 4 is also known, the unit weight w of the electric wire 4 to be used is known. Therefore, it can be assumed before the work of transferring the wires.
In addition, the constant load needs only to have a weight that is assumed in advance at the work site where the electric wires are transferred, so the constant load load body is divided into work sites where mountain vehicles are difficult to enter. It can be transported manually and assembled on site.
Usually, when transferring an overhead power transmission line, the distance S between the towers, the deflection distance D of the electric wire 4 and the unit weight w of the electric wire 4 are known from the planning stage. That is, the constant load W can be calculated, and it can be assumed in advance how many kilograms of the constant load body should be prepared.

  As shown in FIG. 4, the apparatus configuration of the constant-load loading body 11 is an electric motor (specifically three motors) that rotatably rotates a reel 12 around which one end of the wire rope 10 is wound. Phase induction motor) 13, a tension sensor 14 is provided to apply tension to the wire rope 10 wound around the reel 12 by the electric motor 13, and the movement speed of the wire rope 10 is detected. The winding speed of the wire rope 10 is detected by comparing the moving speed of the wire rope 10 and the rotational speed of the electric motor 13, and a specified load value to be loaded on the wire rope 10 based on this winding diameter ( The rotational torque of the electric motor 13 is calculated from the value obtained by the above method), and the rotational direction and rotational torque of the electric motor 13 are controlled. And it has a formation. Further, the moving speed of the wire rope 10 detected by these speed sensors 14 and the rotational speed of the electric motor 13 are compared and calculated to detect the winding diameter of the wire rope 10, and based on this winding diameter, the wire rope The computer 15 calculates the rotational torque of the electric motor 13 from the designated load value (value obtained by the above method) to be loaded on the motor 10 and controls the rotational direction and the rotational torque of the electric motor 13.

Further, instead of the constant load load body 11 shown in FIG. 3, the constant load load body 16 shown in FIG. 5 may be used. In this case, a load sensor 17 that detects the tension of the wire rope 10 wound around the reel 12 is provided, and the load value of the wire rope 10 detected by the load sensor 17 and the specified load value to be loaded on the wire rope 10 are provided. And the computer 18 calculates the rotational torque of the electric motor 13 so that these values are always the same, and controls the rotational direction and rotational torque of the electric motor 13.
These constant load loaded bodies 11 and 16 can be made to function easily by incorporating an algorithm that allows the computer to function optimally.

  This construction method is applicable to the wire transfer forms shown in FIGS. First, FIG. 6 shows a first use example of this construction method. As in the case shown in FIGS. 1 and 2, the transfer work for changing the attachment point at one end of the electric wire to another tower or support. Is shown. Moreover, what is shown in FIG. 7 shows the 2nd usage example of this construction method, and is transfer work which changes the attachment point of the intermediate part of a continuous electric wire upward. In this case, the wire rope 10 is connected to one end (left side in FIG. 7) of the wire 4 to be transferred, and the constant load carrying body 11 or 16 is connected to the wire rope 10 while applying a constant load. The rope 20 of the gold wheel 19 from which the intermediate wire 4 is suspended is wound up by a winder 21 installed on the ground, and the intermediate portion of the electric wire 4 is moved upward and transferred.

FIG. 8 shows a third usage example of this construction method. Similarly to FIG. 7, it is a transfer work in which the attachment point of the middle part of the electric wire is changed upward. This is a case where a constant load carrier cannot be installed under the steel tower. Therefore, a transfer wire lifting bracket 22 is provided at a location where the attachment point of the wire is changed upward, and a rope 23 connected to the transfer wire lifting bracket 22 is wound up by a winder 24 installed under the steel tower. Then, the electric wire 4 is moved upward and transferred. At that time, the wire ropes 10 are respectively connected to the four electric wires on both sides of the transfer hoisting bracket 22, and the constant load loading bodies 11 or 16 are respectively connected to the wire ropes 10 to apply a constant load. Moreover, what is shown in FIG. 9 shows the 4th usage example of this construction method, and when a part of the electric wire 4 suspended on the support such as a steel tower is damaged, the electric wire is moved laterally by several tens of meters. It is the transfer work of time. Also in this case, the rope 25 is connected to one end of the electric wire 4 and the rope 25 is wound up by the winder 26 to move the electric wire 4 in the lateral direction. At that time, a wire rope 10 is attached to the other end of the electric wire 4, and the constant load loading body 11 or 16 is connected to the wire rope 10 to apply a constant load to the electric wire 4. And when the damaged part of the electric wire 4 moves to a steel tower part, it is the operation | work which repairs the damaged part of the electric wire 4 and returns the electric wire 4 to the original position there.

  In addition, in the said Example, although the wire rope was connected to the electric wire to transfer and this was connected to the constant load load body, it should just be an appropriate linear body, such as not only a wire rope but a rope and an electric wire. In the above embodiment, the electric motor 13 is used. However, any other appropriate rotational drive device may be used. Moreover, in the usage example of this construction method of FIGS. 5 to 8, a semi-set is interposed in the connection between the wire 4 to be transferred and the wire rope 10, but the use of this semi-set is optional.

It is a schematic block diagram which shows the transfer method of this invention. It is a schematic block diagram which shows the middle of the transfer method of this invention. It is principle explanatory drawing which shows the calculation method of the constant load used for the transfer method of this invention. It is a schematic block diagram of the apparatus of the constant load loading body used for the transfer method of this invention. It is a schematic block diagram of the other Example of the apparatus of the constant load loading body used for the transfer method of this invention. It is a schematic block diagram which shows the 1st usage example of the transfer method of this invention. It is a schematic block diagram which shows the 2nd usage example of the transfer method of this invention. It is a schematic block diagram which shows the 3rd usage example of the transfer method of this invention. It is a schematic block diagram which shows the 4th usage example of the transfer method of this invention. It is a schematic block diagram of the conventional transfer method. (A) is an explanatory view showing the relationship between the weight load and the moving distance when a constant load is applied using a weight, and (b) the weight is the weight load and the moving distance when a semi-assembly of a pulley is interposed therebetween. It is explanatory drawing which shows these relationships. It is explanatory drawing explaining the principle of the constant load loading apparatus used for the transfer method of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Steel tower 2 Steel tower 3 Steel tower 4 Electric wire 5 Steel tower 6 Gold wheel 7 Gold wheel 8 Rope 9 Rope 10 Wire rope 11 Constant load loading body 12 Reel 13 Electric motor 14 Speed sensor 15 Computer 16 Constant load loading body 17 Load sensor 18 Computer 19 Gold Car 20 Rope 21 Winder 22 Transfer lifting bracket 23 Rope 24 Winder
25 Rope 26 Winder

Claims (5)

By connecting one end of the wire to be transferred to the upper end of the steel tower to be transferred and connecting the other end to the load carrying body provided near the ground via the steel tower near the wire, the wire to be transferred In the wire transfer method for overhead power transmission lines that transfer wires while applying a load to
The method of applying a load to the wire to be transferred by the load loaded body is to constantly apply a constant load corresponding to the tension calculated from the distance between towers, the bending distance of the wire, and the unit weight of the wire,
The constant load is performed by controlling the forward / reverse rotation of the electric motor of the wire rope take-up reel with a computer so that the wire rope load of the wire rope connected to the electric wire is always equal to the constant load. Characteristic method for transferring overhead power lines while constantly applying constant load. The computer control in claim 1 incorporates an algorithm for controlling the forward / reverse rotation of the electric motor of the wire rope take-up reel by a computer so that the wire rope load and the constant load are always equal. The construction method for transferring an overhead power transmission line while applying constant constant load according to claim 1. A reel around which one end of the wire rope is wound is rotatably provided, a rotation driving device is provided for rotating the reel, tension is applied to the wire rope led out from the reel by the rotation driving device, and the moving speed of the wire rope A speed sensor for detecting the wire rope is detected, the wire rope moving speed detected by the speed sensor is compared with the rotational speed of the rotary drive device to detect the winding diameter of the wire rope, and based on this winding diameter, The rotational torque of the rotational drive device is calculated from the constant load value obtained by the method according to claim 1 to be loaded on the wire rope, and the rotational direction and rotational torque of the rotational drive device are controlled. The constant load loading apparatus used for the method of Claim 1. A reel around which one end of the wire rope is wound is rotatably provided, a rotary drive device is provided for rotationally driving the reel, tension is applied to the wire rope led out from the reel by the rotary drive device, and the tension of the wire rope is increased. A load sensor for detection is provided, and the load value of the wire rope detected by the load sensor is compared with the constant load value obtained by the method according to claim 1, and these load values are always the same. The constant load loading device used in the method of claim 1, wherein the rotational direction and rotational torque of the rotational drive device are controlled so that 5. A computer apparatus that automatically performs various controls in the constant load loading apparatus according to claim 3.