JP6738674B2 - Parts replacement jack - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a member replacement jack used in replacement work of a belly member or the like attached between columns of a power transmission tower.

The abdominal material that connects the columns of the power transmission tower may be damaged by metal fatigue or fracture due to corrosion due to aged use or secondary stress due to ground subsidence or earthquake. Since the abdominal material reinforces the compressive stress and tensile stress between the columns due to the influence of wind pressure, etc., if the abdominal material is damaged, the strength of the entire steel tower will be reduced, which is dangerous and promptly new Replacement with belly material is required. In addition to external damage such as corrosion, which is visually discernible, how much compressive stress or tensile stress is actually applied to the abdominal material by the above secondary stress, that is, how much more abnormal than the specified value is Knowing whether or not the force is applied is an important factor in estimating the metal fatigue of the abdominal material and considering whether or not to replace the abdominal material and when to replace it.

As a method of replacing the abdominal material that has been visually damaged such as corrosion, a method as disclosed in Patent Document 1, for example, is generally used. In this method, a jack (replacement tool) that substitutes the load of the abdominal material that is parallel to the damaged abdominal material is attached between the columns, and the damaged abdominal material is replaced with a new abdominal material, and then the jack is removed. ing.

JP, 2001-268758, A

However, with the jack used in the above-mentioned conventional replacement means, even if it is possible to replace the abdominal material that is visually damaged such as corrosion, how much abnormal tensile stress or compressive stress is applied to the existing abdominal material. I can't know if I'm joining.

The jack has a permissible rated load. When replacing the abdomen, if tensile stress or compressive stress exceeding the rated load is applied due to the direction and strength of the wind, it will be dangerous for workers working at high places and it is necessary to evacuate. Therefore, it is desirable to be able to measure the load in real time.

Therefore, the present invention provides a member replacement jack that can be used as a member replacement tool for abdominal material or the like and that has a function of easily measuring tensile stress and compressive stress applied to a member such as abdominal material. The purpose is to

In order to solve the above problems, the present invention takes the following technical means. That is, the member replacement jack of the present invention is a member replacement jack that is mounted between the columns of a steel tower, and has a drive mechanism including a gear and a screw shaft built-in, and this drive mechanism is provided via a rotary operation unit. And a cylindrical jack body formed to expand and contract when driven, and a mounting portion provided at both ends of the jack body and having mounting holes for inserting a shaft pin of a mounting tool used for mounting to the column. When the a strain gauge for measuring at least one of tensile stress or compressive stress from the outside is loaded in the mounting portion, Rutotomoni the bearing bearing member is fitted into the mounting hole of the one of the mounting portion The shaft pin is inserted into the through hole of the member, the sensor of the strain gauge is incorporated in the bearing member , and the connector electrically connected to the sensor is provided on the outer surface of the mounting portion in which the bearing member is fitted. The strain gauge measuring portion is connected to the connector.
Here, it is preferable that the sensor is attached to each portion of the bearing member that receives the tensile stress and the compressive stress.

Since the present invention is configured as described above, by attaching the jack of the present invention to the support in parallel with the abdomen to substitute the load of the abdominal material, it can be used as a replacement tool for the abdominal material. By connecting the sensor incorporated in the bearing member to the measuring portion of the strain gauge, it becomes possible to measure the tensile stress and the compressive stress applied to the abdominal material. By this measurement, it is possible to easily understand how much abnormal tensile stress or compressive stress is applied to the abdominal material, and it is possible to estimate the degree of metal fatigue of the abdominal material and determine the appropriateness and timing of replacement. There is an effect that you can.

In the present invention, it is preferable that the strain gauge includes a portable measurement unit including a display unit and operation buttons, and a connection cable that connects the measurement unit to a connector of the jack body.
As a result, the tensile stress and the compressive stress can be easily carried and measured even at a high place or in an unstable site of the scaffold.

The perspective view which abbreviate|omitted and showed the strain gauge part of the jack which concerns on this invention. The partial cross section side view of the jack shown in FIG. The expanded side view and disassembled perspective view of the principal part of the jack shown in FIG. The side view which shows the attachment state to the power transmission tower of the jack which concerns on this invention. The partial expanded top view which shows the jack in the state of FIG.

Hereinafter, details of the present invention will be described based on FIGS. 1 to 5 showing an embodiment thereof.
The member replacement jack A of this embodiment includes a tubular jack body 1 having a built-in drive mechanism including bevel gears 2 and 3 and a long screw shaft 4.

The jack main body 1 includes left and right tubular members 1a and 1b which are fitted to each other so as to be capable of expanding and contracting, and one end of a screw shaft 4 is rotatably fixed to one tubular member 1a. The other tubular member 1b is slidably fitted inside the tubular member 1a, and is screwed onto the screw shaft 4 by an internal screw 5 at its inner end portion.
The bevel gear 2 is directly connected to a rotation operating portion 6 protruding to the outside of the tubular member 1a, and a bevel gear 3 meshing with the bevel gear 2 is fixed to a screw shaft 4 so that the rotation operating portion 6 can be rotated. It is formed so that the screw shaft 4 rotates by rotating with a rotating tool such as a wrench, and the tubular member 1b expands and contracts with respect to the tubular member 1a.

Further, mounting portions 7, 7 are provided on both ends of the jack body 1, that is, on the free ends of the tubular member 1a and the tubular member 1b. The mounting portion 7 is for mounting on the column 20 of the power transmission tower, and as shown in FIGS. 4 and 5, has a mounting hole 8 through which the shaft pin 22 of the mounting tool 21 mounted on the column 20 is inserted. ..

Further, as shown in FIG. 3, a bearing member 9 made of a metal material such as iron or a brass alloy is fitted into the mounting hole 8 of the mounting portion 7 of the one tubular member 1a. The mounting hole 8 of the tubular member 1a is formed in a size that allows the bearing member 9 to be fitted therein, and the through hole 9b of the bearing member 9 fitted therein is formed with the same diameter as the other mounting hole 8. Becomes a substantial mounting hole. The strain gauge B sensors 10 and 10 are incorporated in the bearing member 9. The sensors 10 and 10 are provided on the left and right outer peripheral surfaces of the bearing member 9 along a line along the axial center of the jack body 1 when the jack A is attached to the column 20 of the steel tower. There is. Specifically, as shown in FIG. 3B, the left and right outer peripheral surfaces of the bearing member 9 are cut so as to be parallel to each other to form flat portions 9a and 9a, and the sensors 10 and 10 are attached to the flat surfaces. It is attached. Further, a connector 12 electrically connected to the sensors 10 and 10 via an electric wire 11 is provided on the outer surface of the tubular member 1a.

The sensor of the strain gauge B utilizes the property that the electric resistance value increases or decreases when strained by an external tensile stress or a compressive stress. A metal wire is formed on the sheet, and the external stress is applied. The tensile stress and the compressive stress are calculated by reading the voltage change based on the resistance change of the metal wire when receiving the stress using a well-known bridge circuit.

In the present embodiment, the measuring unit including the bridge circuit of the strain gauge B is mounted on the portable controller 13, and is connected to the controller 13 via the connection cable 14 for connecting to the connector 12 of the jack body 1. It The controller 13 includes an operation button 15, a display unit 16, and a power switch 17, so that a jack 18 provided at the tip of the connection cable 14 can be inserted into the connector 12 to receive a distortion signal from the sensor 10. Has become. Since the specific configurations of the sensor and the measurement unit (bridge circuit) of the strain gauge B are general, detailed description will be omitted.

When the damaged abdominal material is to be replaced using the member replacing jack A, as shown in FIG. Attached to 20, 20, the load of the belly member 23 is replaced by the jack A. In this state, after replacing the belly member 23 with a new one, the jack A is removed to complete the replacement work.

In addition, when measuring how much compressive stress or tensile stress is actually applied to the existing abdominal material by the secondary stress, as in the replacement work of the abdominal material 23 described above, The jack A is attached to the support columns 20 and 20 in parallel with the belly material 23 to be measured by the attachment tools 21 and 21. Then, one of the left and right connecting portions of the abdominal material 23 with respect to the support column 20 is removed to release the load applied to the abdominal material 23, and the load of the abdominal material 23 is replaced by the jack A. In this state, as shown in FIG. 2, by inserting the jack 18 of the strain gauge B into the connector 12 of the jack A, the tensile stress or compression applied to the abdominal material 23 is determined by the data from the sensor 10 attached to the bearing member 9. The stress can be easily measured.

Specifically, when a tensile stress is applied to the jack body 1, the shaft pin 22 presses the right inner surface of the bearing member 9 (see FIG. 3) to deform the right portion of the bearing member 9, and the right sensor 10 is Operates and measures tensile stress. On the contrary, when a compressive stress is applied, the shaft pin 22 presses the left inner surface of the bearing member 9 to deform the left side portion of the bearing member 9, and the left sensor 10 operates to measure the compressive stress.
By this measurement, it is possible to know how much abnormal tensile stress or compressive stress is applied to the abdominal material 23, estimate the degree of damage such as metal fatigue in the abdominal material 23, and decide whether or not to replace it. can do.
Further, since the measurement can be performed in real time, it is possible to take a countermeasure such as immediately evacuating the worker when the direction of the wind changes or a compressive stress or a tensile stress exceeding the rated load is applied.

The representative examples of the present invention have been described above, but the present invention is not necessarily limited to the above embodiments. Further, it can also be applied to replacement work of similar members other than the above-described belly member of the steel tower.
Further, in the above embodiment, a mode in which both the sensor for measuring the tensile stress and the sensor for measuring the compressive stress are provided is shown. However, when it is sufficient to measure only the tensile stress or only the compressive stress, either It is also possible to attach only one of the sensors.
Further, in the above embodiment, the bearing member 9 provided with the sensor 10 is provided on the mounting portion 7 of the one tubular member 1a, but the bearing member 9 is provided on the mounting portion 7 of the other tubular member 1b. You may do it.
Others In the present invention, the object can be achieved, and appropriate modifications and changes can be made without departing from the scope of the claims.

INDUSTRIAL APPLICABILITY The present invention can be used as a member replacement jack used when replacing a belly member or the like attached to a support or the like of a steel tower, or when measuring a tensile stress and a compressive stress applied to the belly member or the like.

A member replacement jack B strain gauge 1 jack body 1a tubular member 1b tubular member 2 bevel gear 3 bevel gear 4 screw shaft 5 inner screw 6 turning operation portion 7 mounting portion 8 mounting hole 9 bearing member 10 sensor 12 connector 13 controller (Measurement section)
14 Connection Cable 16 Display 18 Jack 20 Support 21 Fixture 22 Shaft Pin 23 Belly

Claims (3)

A jack for exchanging members, which is attached between columns of a steel tower,
A tubular jack main body that has a built-in drive mechanism including a gear and a screw shaft, and is formed to expand and contract by driving this drive mechanism via a rotation operation unit,
A mounting portion provided at both ends of the jack body, the mounting portion having a mounting hole through which a shaft pin of a mounting tool used for mounting to the column is inserted ,
A strain gauge for measuring at least one of an external tensile stress or a compressive stress applied to the mounting portion is provided,
Wherein one bearing member to the mounting hole of one of the attachment portion is the shaft pin inserted into the through hole of the fit is Rutotomoni the bearing member, the sensor of the strain gauge is incorporated in the bearing member, electrically to the sensor A connector for exchanging a member, wherein the connector connected to the connector is provided on an outer surface of a mounting portion in which the bearing member is fitted, and the connector is connected to a measuring portion of a strain gauge. The member replacement jack according to claim 1, wherein the sensor is attached to a portion of the bearing member that receives tensile stress and compressive stress. The member replacement according to claim 1 or 2, wherein the strain gauge includes a portable measurement unit including a display unit and operation buttons, and a connection cable that connects the measurement unit to the connector of the mounting unit. For jack.

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