CN111829878A - Mechanical property testing device and method for angle steel reinforcing member of power transmission tower - Google Patents
Mechanical property testing device and method for angle steel reinforcing member of power transmission tower Download PDFInfo
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- CN111829878A CN111829878A CN202010499807.XA CN202010499807A CN111829878A CN 111829878 A CN111829878 A CN 111829878A CN 202010499807 A CN202010499807 A CN 202010499807A CN 111829878 A CN111829878 A CN 111829878A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M5/00—Investigating the elasticity of structures, e.g. deflection of bridges or air-craft wings
- G01M5/0041—Investigating the elasticity of structures, e.g. deflection of bridges or air-craft wings by determining deflection or stress
- G01M5/005—Investigating the elasticity of structures, e.g. deflection of bridges or air-craft wings by determining deflection or stress by means of external apparatus, e.g. test benches or portable test systems
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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
Technical Field
The invention relates to a device and a method for testing mechanical properties of a transmission tower angle steel reinforcing member.
Background
The power transmission angle steel tower is important supporting equipment of a power transmission line, and the safety and reliability of the power transmission angle steel tower are important guarantees for ensuring the safe operation of a power grid. The potential safety hazard is caused by insufficient design strength, improper material selection, geographical environment change, corrosion, icing, external force damage and other reasons of part of in-service transmission angle steel towers, and the power grid safety is seriously threatened. The technology for repairing and reinforcing the power transmission tower is a new technology developed in recent years, the technology completes the connection and manufacture of parts by reasonably designing a power transmission tower angle steel reinforcing and reinforcing structure and adopting a fusion welding or clamp reinforcing technology, can effectively eliminate the defects of insufficient strength, part damage and the like of the power transmission tower, and greatly improves the operation safety of a power transmission line. The existing reinforcing and repairing technology for angle steel is continuously developed and perfected, and for newly developed reinforcing and repairing technology, in order to ensure that the reinforcing effect meets the safe and stable operation requirement of an angle steel tower, a relevant mechanical property test is required in the development stage.
Therefore, the accuracy of the test result needs to be ensured according to the mechanical property requirement, otherwise, the performance of the supporting equipment is different due to different variable factors caused by the environment of the angle iron reinforcement. How to adapt to present transmission line, to this kind of reinforced structure of electricity tower angle steel carry out the detection of static strain, load and deflection isokinetic behavior is the technical problem that needs to solve at present urgently.
Disclosure of Invention
In order to solve the technical problems, the invention designs a corresponding mechanical property testing device for the angle steel reinforcing member of the power transmission tower, which can realize mechanical test tests on reinforced and repaired angle steel, meets the requirements of related mechanical property tests on newly developed reinforcing and repairing technologies in the research and development stage, and is favorable for ensuring that the reinforcing effect of the angle steel reaches the safe and stable operation requirement of the angle steel tower.
The mechanical property testing device comprises a base and a to-be-tested piece connected with the base, wherein one end of the to-be-tested piece is connected with the base, and two end faces of the other end of the to-be-tested 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.
In a second aspect, the invention further provides a mechanical property testing method for the angle steel of the power transmission tower, which adopts the mechanical property testing device for the angle steel of the first aspect, and 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.
Compared with the prior art, the invention has the following beneficial effects:
1. the invention adopts the load tester, the deflection tester and the static strain gauge to measure the piece to be measured, namely the angle steel in the same loading state, so that the result meets the high-precision test requirement, 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 of carrying out related mechanical property tests in the research and development stage, and the reinforcing effect of the angle steel can be ensured to meet the safe and stable operation requirement of the angle steel tower.
2. On the basis of testing a piece to be tested by a load tester, a deflection tester and a static strain gauge, the mechanical test of the reinforced and repaired angle steel can be realized only by externally conforming to the working state of the piece to be tested, the potential safety hazard caused by insufficient design strength, improper material selection, geographical environment change, corrosion, ice coating, external force damage and the like of an in-service transmission angle steel tower is avoided, and the problem that the mechanical test cannot be effectively carried out after the existing angle steel is reinforced is solved.
3. The displacement position measured by the deflection tester and the load applying direction are on the same line, so that data such as static strain, load, deflection and the like are measured simultaneously under the action of the loading mechanism, and the mechanical property of the to-be-measured piece is further obtained by using the method.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the application and, together with the description, serve to explain the application and are not intended to limit the application.
Fig. 1 is an isometric side view of a mechanical property testing device for a transmission tower angle steel reinforcing member of the invention;
FIG. 2 is a top view of the device for testing mechanical properties of the angle steel reinforcing member of the power transmission tower, disclosed by the invention;
FIG. 3 is a schematic structural view of the shackle of the present invention;
wherein, 1, static strain tester; 2. a first bracket; 3. a data line; 4. an angle steel reinforcing member; 5. fastening a bolt; 6. a base; 7. a test end of the load detector; 8. of load-detecting instruments
A loading end; 9. a chain block; 10. a cement base; 11. a first lifting lug; 12. a second lifting lug; 13. a third support; 14. a load detector; 15. a second bracket; 16. a deflection detector; 17. and (7) fixing the plate.
The specific implementation mode is as follows:
the invention is further described with reference to the following figures and examples.
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, 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 is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
Example 1
As shown in the attached drawings 1 and 2, the invention provides a mechanical property testing device for angle steel of a power transmission tower, which comprises a deflection tester, a static strain tester, a chain block, a load tester, a fixed base, a fastening bolt and a lifting lug. The lifting lugs connected among the deflection measuring instrument, the load measuring instrument and the angle steel are shown in the attached figure 3. The detection of the mechanical properties such as static strain, load, deflection and the like can be simultaneously completed.
The mechanical property testing device for the angle steel of the power transmission tower comprises a base and a piece to be tested, wherein the piece to be tested is connected with the base, one end of the piece to be tested is connected with the base, and two end faces of the other end of the piece to be tested 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.
Furthermore, the hoisting center heights of the first lifting lug and the second lifting lug are consistent and are in the same plane, so that the displacement position measured by the deflection tester and the load applying direction need to be on the same line; the first lifting lug comprises a rectangular section and a semicircular section which are connected with each other, and a lifting hole is formed in the semicircular section; the second lifting lug is the same as the first lifting lug in structure, and the height of the rectangular section can be automatically set, so that the center heights of the first lifting lug and the second lifting lug falling lifting hole are consistent after installation and are positioned in the same plane.
Furthermore, the piece to be measured is an angle steel reinforcing piece, the angle steel reinforcing piece is an L-shaped component, the L-shaped component comprises a vertical plate and a transverse plate which are mutually connected to form an L shape, one side face of the vertical plate is fixedly connected with the first lifting lug, and the upper end face or the lower end face of the transverse plate is fixedly connected with the second lifting lug. Preferably, the upper end surface of the transverse plate is fixedly connected with the lifting lugs, and the side surface of the vertical plate, which is far away from the transverse plate, is fixedly connected with the first lifting lug; the upper end face is the end face of the transverse plate close to the vertical plate. The lifting centers of the first lifting lug and the second lifting lug are positioned on the same plane.
Further, 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.
Furthermore, the loading mechanism is a chain block.
Furthermore, one end of the loading mechanism is connected with the loading end of the load tester, and the other end of the loading mechanism is fixedly connected with the cement base.
Further, the static strain tester is fixed on a first support, and the height of the first support is the same as that of the base. The data lines of the static strain gauges have the same distance therebetween.
Furthermore, the deflection measuring instrument is connected with the second lifting lug through a steel wire, the deflection measuring instrument is fixed on the second support through a fixing plate, and the height of the second support is the same as that of the base. And the steel wire at the testing end of the load tester and the steel wire of the deflection tester are in the same straight line. Preferably, the straight line where the steel wire at the testing end of the load tester is located is perpendicular to the length direction of the angle steel. Alternatively, the steel wire may carry the wires of the transmission line, so that the detection end of the deflectometer is placed on the steel wire line, or the second lifting lug, so that the detection end of the deflectometer can transmit a detection signal to the deflectometer through the wires.
Furthermore, the load tester is fixedly connected with a third support, and the height of the third support is the same as that of the base.
Furthermore, the deflection measuring instrument and the second lifting lug.
The end of the reinforced angle steel is fixed on the base in a welding and bolt fastening mode, a chain block is used for loading, the load is increased by 2kN in each loading stage, and the initial load is 2 kN. And measuring the actual load increased at each stage by using a load tester, and measuring the displacement deformation condition of the steel end part after the load is increased at each stage by using a deflection tester. And (4) detecting the micro-strain of the angle steel measuring point position at each loading stage by adopting a static strain gauge.
The displacement position measured by the displacement tester and the load applying direction need to be on the same line. The load applying position is positioned at the end part of the angle steel, wherein the angle steel is connected with the chain block through a welding lifting lug, a steel wire and a load tester. The strain gauge used by the strain gauge is attached to the position of the central line of the angle steel deformation surface.
In other embodiments, the present application further provides:
a mechanical property testing method for angle steel of a power transmission tower adopts the angle steel mechanical property testing device in the embodiment, and 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.
Further, the step of analyzing the stress condition of the to-be-tested piece includes:
force analysis in the vertical direction: only under the self gravity of the piece to be measured, the piece can be regarded as evenly distributed load with the concentration degree of q, the length of the extending part is L, and the bending moment in the vertical direction of the end part is
Deflection of
(E is the modulus of elasticity of the material, 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 tensile force F (namely a loading force) vertical to the extending direction of the piece to be measured, so that the bending moment of the end part of the piece to be measured in the horizontal direction is FL, and the deflection is FL
And comparing the calculation result with the experiment result to obtain the mechanical data such as the section inertia moment of the piece to be measured after the piece to be measured is reinforced by the section increasing method so as to evaluate the actual reinforcing effect.
Although the embodiments of the present invention have been described with reference to the accompanying drawings, it is not intended to limit the scope of the present invention, and it should be understood by those skilled in the art that various modifications and variations can be made without inventive efforts by those skilled in the art based on the technical solution 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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| CN202010499807.XA CN111829878A (en) | 2020-06-04 | 2020-06-04 | Mechanical property testing device and method for angle steel reinforcing member of power transmission tower |
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| CN202010499807.XA CN111829878A (en) | 2020-06-04 | 2020-06-04 | Mechanical property testing device and method for angle steel reinforcing member of power transmission tower |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112502527A (en) * | 2020-11-24 | 2021-03-16 | 广东顺德电力设计院有限公司 | In-situ lifting method for tower |
| CN114295637A (en) * | 2021-12-31 | 2022-04-08 | 四川翔越电力线路构件有限公司 | Electric power iron tower angle steel factory detection equipment |
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| CN114295637A (en) * | 2021-12-31 | 2022-04-08 | 四川翔越电力线路构件有限公司 | Electric power iron tower angle steel factory detection equipment |
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