CN111829878A - A device and method for testing the mechanical properties of an angle steel reinforcement of a transmission tower - Google Patents

Abstract

The invention provides a device and a method for testing mechanical properties of angle steel of a power transmission tower, which comprises the following steps: the device comprises a base and a to-be-detected piece connected with the base, wherein one end of the to-be-detected piece is connected with the base, and two end faces of the other end of the to-be-detected piece are fixedly connected with a first lifting lug and a second lifting lug respectively; the first lifting lug is connected with one end of a load tester, the other end of the load tester is connected with a loading mechanism, and the second lifting lug is connected with a deflection tester; the middle section of the piece to be tested is connected with the static strain tester through a plurality of data lines; the mechanical test on the reinforced and repaired angle steel can be realized, the newly developed reinforcing and repairing technology has the requirement of meeting the requirement that the related mechanical property test needs to be carried out in the research and development stage, and the reinforcing effect of the angle steel can be guaranteed to meet the safe and stable operation requirement of the angle steel tower.

Description

A device and method for testing the mechanical properties of an angle steel reinforcement of a transmission tower

technical field

The invention relates to a device and a method for testing the mechanical properties of an angle steel reinforcement of a transmission tower.

Background technique

The transmission angle steel tower is an important supporting equipment for the transmission line, and its safety and reliability is an important guarantee to ensure the safe operation of the power grid. Some in-service transmission angle steel towers have hidden safety hazards due to insufficient design strength, improper material selection, changes in geographical environment, corrosion, icing and external force damage, which seriously threaten the security of the power grid. The transmission pole repair and reinforcement technology is a new technology developed in recent years. This technology can effectively eliminate the strength of the transmission tower by reasonably designing the angle steel reinforcement and reinforcement structure of the transmission tower, and using fusion welding or fixture reinforcement technology to complete the connection and manufacture of components. Defects such as deficiencies and component damage greatly improve the operational safety of transmission lines. At this stage, the angle steel reinforcement and repair technology is still being continuously developed and improved. For the newly developed reinforcement and repair technology, in order to ensure that the reinforcement effect meets the requirements for the safe and stable operation of the angle steel tower, it is necessary to carry out relevant mechanical performance tests in the research and development stage.

Therefore, according to the requirements of its mechanical properties, it is necessary to ensure the accuracy of its test results, otherwise, the performance of the supporting equipment will be different for the different variable factors brought by the environment of the angle steel reinforcement. How to adapt to the current transmission lines, the detection of mechanical properties such as static strain, load and deflection for the reinforced structure of the tower angle steel is a technical problem that needs to be solved urgently.

SUMMARY OF THE INVENTION

In order to solve the above-mentioned technical problems, the present invention designs a corresponding mechanical property testing device for the angle steel reinforcement of the transmission tower, which can realize the mechanical testing test of the angle steel that has been reinforced and repaired. The requirements of relevant mechanical performance tests are carried out, and it is beneficial to ensure that the reinforcement effect of the angle steel meets the requirements of the safe and stable operation of the angle steel tower.

In a first aspect, the present invention provides a device for testing the mechanical properties of angle steel of a transmission tower, including a base, and a test piece connected to the base, one end of the test piece is connected to the base, and two end faces of the other end are respectively connected to the first test piece. , The second lifting lug is fixedly connected; the first lifting lug is connected to one end of the load tester, the other end of the load tester is connected to the loading mechanism, and the second lug is connected to the deflection measuring instrument; Connect to a static strain tester.

In the second aspect, the present invention also provides a method for testing the mechanical properties of a transmission tower angle steel, using the angle steel mechanical property testing device as described in the first aspect, and the steps include:

The loading mechanism is used for loading, which is divided into several loading stages according to the different loads. The first loading stage has a set load, and each subsequent loading stage increases the set load;

Use a load tester to determine the actual load added at each loading stage;

The deflection tester was used to measure the displacement and deformation data of the end of the angle steel after increasing the load in each loading stage;

The static strain gauge is used to detect the micro-strain data of the angle steel measuring point at each loading stage;

Through the collected increased actual load, displacement deformation data and position micro-strain data, the stress of the test piece is analyzed.

Compared with the prior art, the present invention has the following beneficial effects:

1. The present invention uses a load tester, a deflection tester and a static strain gauge to measure the piece to be tested, that is, the angle steel under the same loading state, so that the result meets the high-precision test requirements, and can realize the mechanical analysis of the angle steel after reinforcement and repair. The test test shows that the newly developed reinforcement and repair technology meets the requirements of relevant mechanical performance tests in the research and development stage, and is conducive to ensuring that the reinforcement effect of the angle steel meets the requirements for the safe and stable operation of the angle steel tower.

2. Based on the test of the load tester, the deflection tester and the static strain gauge, the present invention only needs to meet the working state of the test piece on the outside, and then the mechanical test can be performed on the angle steel that has been reinforced and repaired. In-service power transmission angle steel towers have potential safety hazards due to insufficient design strength, improper material selection, changes in geographical environment, corrosion, icing and external force damage.

3. The displacement position measured by the deflection tester of the present invention is on the same line as the direction of the applied load, so that data such as static strain, load and deflection can be measured simultaneously under the action of the loading mechanism, and the method to be tested is further obtained by using the method of the present application. mechanical properties.

Description of drawings

The accompanying drawings that form a part of the present application are used to provide further understanding of the present application, and the schematic embodiments and descriptions of the present application are used to explain the present application and do not constitute improper limitations on the present application.

Fig. 1 is an isometric side view of a transmission tower angle steel reinforcement mechanical performance testing device of the present invention;

Fig. 2 is the top view of the device for testing the mechanical properties of the transmission tower angle steel reinforcement of the present invention;

Fig. 3 is the structural representation of the lifting lug of the present invention;

Among them, 1. Static strain tester; 2. First bracket; 3. Data cable; 4. Angle steel reinforcement; 5. Fastening bolts; 6. Base; 7. Test end of load detector; 8. Load detector of

Loading end; 9. Chain hoist; 10. Cement base; 11. First lifting lug; 12. Second lifting lug; 13. Third bracket; 14. Load detector; 15. Second bracket; 16. Deflection detection instrument; 17. Fixed plate.

Detailed ways:

The present invention will be further described below with reference to the accompanying drawings and embodiments.

It should be noted that the following detailed description is exemplary and intended to provide further explanation of the application. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

It should be noted that the terminology used herein is for the purpose of describing specific embodiments only, and is not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly dictates otherwise, the singular is intended to include the plural as well, furthermore, it is to be understood that when the terms "comprising" and/or "including" are used in this specification, it indicates that There are features, steps, operations, devices, components and/or combinations thereof.

Example 1

As shown in the accompanying drawings 1 and 2, a device for testing the mechanical properties of angle steel of a transmission tower is proposed for the present invention, which includes a deflection measuring instrument, a static strain tester, a chain hoist, a load tester, a fixed base, a fastening bolt, hanging lugs. The lifting lugs connected between the deflection tester, the load tester and the angle steel are shown in Figure 3. It can complete the detection of mechanical properties such as static strain, load, deflection, etc. at the same time.

A device for testing the mechanical properties of angle steel of a transmission tower, comprising a base and a test piece connected to the base, wherein one end of the test piece is connected to the base, and two end faces of the other end are respectively fixed to first and second lifting ears; The first lifting lug is connected to one end of the load tester, the other end of the load tester is connected to the loading mechanism, and the second lug is connected to the deflection measuring instrument; the middle section of the test piece is connected to the static strain tester through several data lines.

Further, the lifting centers of the first and second lifting lugs have the same height and are in the same plane, so that the displacement position measured by the deflection tester and the direction of the applied load need to be on the same line; the first lifting lug It includes a rectangular section and a semicircular section that are connected to each other, and a lifting hole is arranged in the semicircular section; the second lifting lug has the same structure as the first lifting lug, and the height of the rectangular section can be set by itself, so that the first lifting lug and the The center height of the second hanging hole is the same and is in the same plane.

Further, the test piece is an angle steel reinforcement, the angle steel reinforcement is an L-shaped member, and the L-shaped member includes a vertical plate and a horizontal plate that are connected to each other to form an L-shaped, and one side of the vertical plate is connected to the first hanging plate. The ears are fixedly connected, and the upper end face or the lower end face of the horizontal plate is fixedly connected with the second lifting lug. Preferably, the upper end surface of the horizontal plate is fixedly connected to the lifting lug, and the side surface of the vertical plate away from the horizontal plate is fixedly connected to the first lifting lug; the upper end surface is the end surface of the horizontal plate close to the vertical plate. The lifting center of the first lifting lug and the second lifting lug are on the same plane.

Further, the load tester includes a test end and a loading end, the test end is connected to the first lifting lug through a steel wire, and the loading end is connected to the loading mechanism through a steel wire.

Further, the loading mechanism is a chain hoist.

Further, one end of the loading mechanism is connected to the loading end of the load tester, and the other end is fixedly connected to the cement base.

Further, the static strain tester is fixed on a first bracket, and the height of the first bracket is the same as the height of the base. The data lines of the static strain tester have the same distance between them.

Further, the deflection measuring instrument is connected with the second lifting lug through a steel wire, and the deflection measuring instrument is fixed on the second bracket through the fixing plate, and the height of the second bracket is the same as that of the base. The steel wire of the test end of the load tester and the steel wire of the deflection tester are in the same straight line. As a preferred solution, the straight line where the steel wire at the test end of the load tester is located is perpendicular to the length direction of the angle steel. As an option, the steel wire can carry the wire of the transmission line, so that the detection end of the deflection tester is placed on the steel wire line, or at the second lifting lug, so that the inspection end of the deflection tester can be transmitted to the deflection tester through the wire detection signal.

Further, the load tester is fixedly connected to a third bracket, and the height of the third bracket is the same as that of the base.

Further, the deflection measuring instrument and the second lifting lug.

The end of the reinforced angle steel is fixed on the base by welding and bolting, and is loaded by a chain hoist. The load is increased by 2kN in each loading stage, and the initial load is 2kN. A load tester was used to measure the actual load added at each stage, and a deflection tester was used to measure the displacement and deformation of the end of the angle steel after each stage of increased load. A static strain gauge was used to detect the micro-strain of the angle steel measuring point at each loading stage.

The displacement position measured by the displacement tester and the direction of the applied load must be on the same line. The position where the load is applied is located at the end of the angle steel, where the angle steel and the chain hoist are connected by welding lifting lugs, steel wires, and a load tester. The strain gauge used in the strain tester is attached to the centerline of the deformed surface of the angle steel.

In other embodiments, the application also provides:

A method for testing the mechanical properties of an angle steel of a transmission tower, using the device for testing the mechanical properties of an angle steel as described in the above embodiment, the steps include:

The loading mechanism is used for loading, which is divided into several loading stages according to the different loads. The first loading stage has a set load, and each subsequent loading stage increases the set load;

Use a load tester to determine the actual load added at each loading stage;

The deflection tester was used to measure the displacement and deformation data of the end of the angle steel after increasing the load in each loading stage;

The static strain gauge is used to detect the micro-strain data of the angle steel measuring point at each loading stage;

Through the collected increased actual load, displacement deformation data and position micro-strain data, the stress of the test piece is analyzed.

Further, the step of analyzing the stress condition of the piece to be tested includes:

挠度为

(E为材料的弹性模量，I为截面的惯性矩)；Force analysis in the vertical direction: only the weight of the object to be tested can be regarded as a uniformly distributed load with a concentration degree of q, and the length of its protruding part is L, then the bending moment in the vertical direction of its end is

Deflection is

(E is the elastic modulus of the material, I is the moment of inertia of the section);

Force analysis in the horizontal direction: the end of the test piece is subjected to a tensile force F (that is, the loading force) perpendicular to the extension direction of the test piece, then the horizontal bending moment of the test piece end is FL, and the deflection is

By comparing the calculation results with the experimental results, the mechanical data such as the moment of inertia of the section of the test piece reinforced by the enlarged section method can be obtained, so as to evaluate the actual reinforcement effect.

Although the specific embodiments of the present invention have been described above in conjunction with the accompanying drawings, they do not limit the scope of protection of the present invention. Those skilled in the art should understand that on the basis of the technical solutions of the present invention, those skilled in the art do not need to pay creative work. Various modifications or deformations that can be made are still within the protection scope of the present invention.

Claims (10)

1. The utility model provides a transmission tower angle steel mechanical properties testing arrangement which characterized in that includes: the device comprises a base and a to-be-detected piece connected with the base, wherein one end of the to-be-detected piece is connected with the base, and two end faces of the other end of the to-be-detected piece are fixedly connected with a first lifting lug and a second lifting lug respectively; the first lifting lug is connected with one end of a load tester, the other end of the load tester is connected with a loading mechanism, and the second lifting lug is connected with a deflection tester; the middle section of the piece to be tested is connected with the static strain tester through a plurality of data lines.

2. The angle steel mechanical property testing device of claim 1, wherein the hoisting centers of the first and second lifting lugs are consistent in height and are in the same plane.

3. The angle steel mechanical property testing device of claim 1, wherein the piece to be tested is an angle steel reinforcing member.

4. The angle steel mechanical property testing device of claim 1, wherein the load tester comprises a testing end and a loading end, the testing end is connected with the first lifting lug through a steel wire, and the loading end is connected with the loading mechanism through a steel wire.

5. The angle steel mechanical property testing device of claim 1, wherein the loading mechanism is a chain block.

6. The angle steel mechanical property testing device of claim 1, wherein one end of the loading mechanism is connected with a loading end of a load tester, and the other end of the loading mechanism is fixedly connected with a cement base.

7. The angle steel mechanical property testing device of claim 1, wherein the static strain tester is fixed on a first bracket, and the height of the first bracket is the same as that of the base.

8. The angle steel mechanical property testing device of claim 1, wherein the deflectometer is connected with the second lifting lug through a steel wire, the deflectometer is fixed on a second bracket through a fixing plate, and the height of the second bracket is the same as that of the base.

9. A mechanical property testing method for angle steel of a power transmission tower, which is characterized in that the mechanical property testing device for angle steel of any one of claims 1-8 is adopted, and the method comprises the following steps:

loading by adopting a loading mechanism, dividing the loading mechanism into a plurality of loading stages according to different loaded loads, wherein the first loading stage has a set load, and the set load is increased in each next loading stage;

measuring the actual load added in each loading stage by using a load tester;

measuring the displacement deformation data of the steel end part after the load is added in each loading stage by adopting a deflection measuring instrument;

detecting micro-strain data of the angle steel measuring point position at each loading stage by adopting a static strain gauge;

and analyzing the stress condition of the piece to be tested through the acquired increased actual load, displacement deformation data and position micro-strain data.

10. The angle steel mechanical property test method of claim 9,

the step of analyzing the stress condition of the piece to be tested comprises the following steps:

force analysis in the vertical direction: the length of the extended part of the piece to be measured is L, and the bending moment of the end part of the piece to be measured in the vertical direction is

Deflection of

E is the elastic modulus of the material, and I is the moment of inertia of the section;

force analysis in the horizontal direction: the end part of the piece to be measured is subjected to a loading force F vertical to the extending direction of the piece to be measured, the bending moment of the end part of the piece to be measured in the horizontal direction is FL, and the deflection is

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