CN111649884A - Device for testing mechanical property of angle steel reinforcing member of power transmission tower - Google Patents
Device for testing mechanical property of angle steel reinforcing member of power transmission tower Download PDFInfo
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- CN111649884A CN111649884A CN202010535844.1A CN202010535844A CN111649884A CN 111649884 A CN111649884 A CN 111649884A CN 202010535844 A CN202010535844 A CN 202010535844A CN 111649884 A CN111649884 A CN 111649884A
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- reinforcing member
- angle steel
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- angle iron
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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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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
- G01B21/32—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring the deformation in a solid
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
- G01L5/0028—Force sensors associated with force applying means
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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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- General Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Aviation & Aerospace Engineering (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention discloses a device for testing mechanical properties of an angle steel reinforcing member of a power transmission tower, which comprises a deflection measuring instrument, a micro-strain tester, a load measuring instrument, a displacement tension structure, a first support, a second support and a base, wherein the micro-strain tester is installed on the first support, a strain gauge is attached to the angle steel reinforcing member and connected with the micro-strain tester through a data line, a fixing plate is arranged on the second support, the deflection measuring instrument is connected to the second support through the fixing plate, a steel plate installation block is arranged on the base, one end of the angle steel reinforcing member is connected with the steel plate installation block, the other end of the angle steel reinforcing member is connected with the deflection measuring instrument through a first connecting rod, the other end of the angle steel reinforcing member is connected with the displacement tension. The invention can simultaneously complete the detection of the mechanical properties of the angle iron reinforcement, such as micro strain, load, deflection and the like, and can reliably and accurately represent the reinforcement effect of the reinforced part.
Description
Technical Field
The invention relates to the technical field of power transmission tower reinforcement and reinforcement, in particular to a device for testing mechanical properties of a power transmission tower angle steel reinforcement.
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. However, there is no known apparatus for detecting mechanical properties such as microstrain, load, and deflection, which can not reliably and accurately reinforce and reinforce a reinforced part. To the mechanical properties requirement of transmission tower angle steel reinforcement, this patent has designed corresponding transmission tower angle steel reinforcement mechanical properties test device.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a device for testing the mechanical property of an angle steel reinforcing member of a power transmission tower. The invention can simultaneously complete the detection of the mechanical properties of the angle iron reinforcement, such as micro strain, load, deflection and the like, and can reliably and accurately represent the reinforcement effect of the reinforced part.
The technical scheme adopted by the invention for solving the technical problems is as follows:
a device for testing mechanical properties of an angle steel reinforcing member of a power transmission tower comprises a deflection measuring instrument, a micro-strain detector, a load measuring instrument, a displacement tension structure, a first support, a second support and a base, wherein the micro-strain detector is installed on the first support, a strain gauge is attached to the angle steel reinforcing member and connected with the micro-strain detector through a data line, a fixing plate is arranged on the second support, the deflection measuring instrument is connected to the second support through the fixing plate, a steel plate installation block is arranged on the base, one end of the angle steel reinforcing member is connected with the steel plate installation block through a fastening bolt or welding, the other end of the angle steel reinforcing member is connected with the deflection measuring instrument through a first connecting rod, the other end of the angle steel reinforcing member is connected with the displacement tension structure, the load measuring instrument is connected with the displacement tension structure, and measuring the displacement deformation condition of the end part of the angle iron reinforcing member under different forces by using a deflection measuring instrument.
The strain gauge is attached to the center line of the deformation surface of the angle steel reinforcing member.
And a plurality of positions of the strain gauge are attached to the angle steel reinforcing member.
The displacement tension structure comprises a steel wire rope, a chain block and a base, the steel wire rope is respectively connected with an angle steel reinforcing member and a first load measuring instrument, the connection mode is a hook, the chain block is also connected with the first load measuring instrument through the steel wire rope, the load measuring instrument comprises a first load measuring instrument and a second load measuring instrument, the first load measuring instrument is connected with the second load measuring instrument through a wire, the second load measuring instrument is installed on a third support, the chain block is connected with the base, and the base is a cement base.
And the displacement position measured by the deflection measuring instrument and the load applying direction are on the same line.
The steel wire rope connecting device is characterized in that a first lifting lug and a second lifting lug are arranged at the other end of the angle steel reinforcing member respectively, the first lifting lug is connected with one side of the angle steel reinforcing member in a welding mode, the second lifting lug is connected with the other side of the angle steel reinforcing member in a welding mode, a first connecting rod is connected with the first lifting lug, and a steel wire rope is connected with the second lifting lug.
The load applying position is located at the end part of the angle steel reinforcing member, and the angle steel reinforcing member is connected with the chain block through a lifting lug, a steel wire rope and a load measuring instrument.
The stress condition of the angle steel reinforcing member is analyzed through a cantilever beam structure and is obtained through the following formula:
1) in the vertical direction, the angle steel reinforcing member is considered to be uniformly distributed with the concentration of q under the action of self gravity, and the bending moment in the vertical direction of the end part of the angle steel reinforcing member is
Deflection of
Wherein, L is the length of the extending part of the angle steel reinforcing member, E is the elastic modulus of the material, and I is the moment of inertia of the section (different sections correspond to different moments of inertia, the moment of inertia can be calculated according to the size of the section, and no specific moment of inertia is given because of different reinforcing sections);
2) in the horizontal direction, the angle steel reinforcement endThe part is subjected to a pulling force F perpendicular to the extending direction of the reinforcing piece, the horizontal bending moment of the end part of the angle steel reinforcing piece is FL, and the deflection is
L is the length of the extending part of the angle steel reinforcing part, E is the elastic modulus of the material, and I is the moment of inertia of the section (the same as above)
The invention has the beneficial effects that:
1. the invention can simultaneously complete the detection of the mechanical properties of the angle iron reinforcement, such as micro strain, load, deflection and the like, and can reliably and accurately evaluate the reinforcement effect of the reinforced part, and the invention can represent the micro strain and the integral deformation condition of the angle iron reinforcement under a certain stress condition and the change process of the angle iron reinforcement in the whole experimental process, provide basic data for subsequent research, can perform detailed comparison analysis with the analysis condition of finite element simulation (simulation of the deformation and stress condition of a reinforced structure under the virtual condition of computer data), provide guidance data, and further optimize a finite element simulation model, thereby achieving the purpose of mutual optimization.
2. Because the strain gauge is attached to the center line of the deformation surface of the angle steel reinforcing member, the strain gauge and the applied load force are on the same horizontal plane, and the strain condition of the angle steel can be represented more accurately.
3. The foil gage pastes on the angle steel reinforcement and has the multiple places, distributes on angle steel longitudinal length, and the little strain condition of reinforcement under the different length apart from the loading position is along with the increase of load to the more three-dimensional sign to the position that the reinforcement is weakest.
4. The displacement position measured by the deflection measuring instrument and the load applying direction are on the same line, and the position and the direction of the load application must be the maximum deformation position, namely the maximum deflection position, so that the displacement change of the angle steel reinforcing member can be represented more obviously and accurately by arranging the measuring position of the deflection measuring instrument at the position.
5. The other end of the angle steel reinforcing piece is provided with a first lifting lug and a second lifting lug respectively, wherein the first lifting lug is connected with one side of the angle steel in a welding mode, the second lifting lug is connected with the other side of the angle steel in a welding mode, the first connecting rod is connected with the first lifting lug, and the steel wire rope is connected with the second lifting lug. The lifting lugs are welded at the end parts of the angle iron reinforcing parts in a welding mode to form firm metallurgical bonding, so that the situation that connecting points are disconnected due to overlarge tension can be avoided, the integrity of the reinforcing parts is kept, and the accuracy of a test result is guaranteed.
6. Because the position of applying load is located the angle steel reinforcement tip, be connected through lug, wire rope, load measuring apparatu between angle steel reinforcement and the chain block. The pull chain hoist, the steel wire rope, the load measuring instrument and the lifting lug are positioned on the same horizontal line, so that the accuracy of a test result is ensured; on the other hand wire rope has good tensile property, and the loading power of this experiment is mostly tensile, has ensured like this under great pulling force, can avoid the cracked condition of pulling force structure emergence.
Drawings
The invention is further described with reference to the following figures and examples:
FIG. 1 shows an embodiment of the present invention
FIG. 1 is a schematic structural diagram of a device for testing mechanical properties of a transmission tower angle steel reinforcement of the invention;
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present invention, the technical solution in the embodiment of the present invention will be clearly and completely described below with reference to the drawings in the embodiment of the present invention, and it is obvious that the described embodiment is only a part of the embodiment of the present invention, and not all embodiments.
In the description of the present invention, the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "vertical", "horizontal", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for the purpose of describing the present invention but do not require that the present invention must be constructed or operated in a specific orientation, and thus, should not be construed as limiting the present invention. The terms "connected" and "connected" in the present invention should be interpreted broadly, and may be connected or disconnected, for example; the terms may be directly connected or indirectly connected through intermediate components, and specific meanings of the terms may be understood as specific conditions by those skilled in the art.
As shown in figure 1, the device for testing the mechanical property of the angle steel reinforcing member of the power transmission tower comprises a deflection measuring instrument 1, a micro-strain tester 2, a load measuring instrument 3, a displacement tension structure, a first support 5, a second support 11 and a base 9, wherein the micro-strain tester 2 is installed on the first support 5, a strain foil is attached to the angle steel reinforcing member 4 and is connected with the micro-strain tester 2 through a data line 13, a fixing plate 12 is arranged on the second support 11, the deflection measuring instrument 1 is connected to the second support 11 through the fixing plate 12, a steel plate installation block 17 is arranged on the base 9, one end of the angle steel reinforcing member 4 is connected with the steel plate installation block 17 through a fastening bolt 8 or welding, the other end of the angle steel reinforcing member is connected with the deflection 1 of the measuring instrument through a first connecting rod 18, the other end of the angle steel reinforcing member 4 is connected with, different forces are applied to the angle iron reinforcing member through the load measuring instrument, and the displacement deformation condition of the end part of the angle iron reinforcing member is measured through the deflection measuring instrument 1 when the forces are different.
The strain gauge is attached to the center line of the deformation surface of the angle steel reinforcing member. And a plurality of positions of the strain gauge are attached to the angle steel reinforcing member.
The displacement tension structure comprises a steel wire rope 19, a chain block 6 and a base 7, wherein the steel wire rope 19 is respectively connected with an angle steel reinforcing member and a load measuring instrument 3, the connection mode is a hook, the chain block 6 is also connected with the load measuring instrument 3 through the steel wire rope, the load measuring instrument comprises the load measuring instrument 3 and a load measuring instrument two 16, the load measuring instrument 3 is connected with the load measuring instrument two 16 through a wire, the load measuring instrument two 16 is installed on a support three 10, the chain block 6 is connected with the base 7, and the base 7 is a cement base.
The displacement position measured by the deflection measuring instrument 1 and the load applying direction are on the same line.
And a first lifting lug 14 and a second lifting lug 15 are respectively arranged at the other end of the angle steel reinforcing member, wherein the first lifting lug 14 is connected with one side of the angle steel reinforcing member in a welding mode and the like, and the second lifting lug 15 is connected with the other side of the angle steel reinforcing member in a welding mode and the like. The first connecting rod is connected with the first lifting lug 14, and the steel wire rope is connected with the second lifting lug 15.
The load applying position is located at the end part of the angle steel reinforcing member, and the angle steel reinforcing member is connected with the chain block through a lifting lug, a steel wire rope and a load measuring instrument. The detection of micro-strain, load, deflection and other mechanical properties can be completed simultaneously.
1. Its tip of angle steel reinforcement adopts welding and bolt-up's mode to be fixed in on the base, adopts chain block to load, and every loading phase increases load 2kN, and initial load is 2 kN. And measuring the actual load increased at each stage by using a load measuring instrument, and measuring the displacement deformation condition of the end part of the steel reinforcing member after the load is increased at each stage by using a deflection measuring instrument. And detecting the micro strain of the measuring point position of the angle steel reinforcing member at each loading stage by adopting a micro strain gauge.
2. The stress condition of the angle steel reinforcing member is analyzed through a cantilever beam structure and is obtained through the following formula:
(1) in the vertical direction, the angle steel reinforcing member is only subjected to self gravity, can be regarded as uniformly distributed load with the concentration of q, and the bending moment in the vertical direction of the end part is
Deflection of
Wherein L is the length of the extending part of the angle steel reinforcing member, E is the elastic modulus of the material, and I is the inertia moment of the section;
(2) in the horizontal direction, the end part of the angle steel reinforcing member is subjected to a tensile force F (namely a loading force) perpendicular to the extending direction of the reinforcing member, so that the bending moment of the end part of the angle steel reinforcing member in the horizontal direction is FL, and the deflection is FL
L is the length of the extending part of the angle steel reinforcing member, E is the elastic modulus of the material, and I is the inertia moment of the section；
(3) And comparing the calculation result with the experimental result to obtain the influence of the change of the moment of inertia of the cross section of the reinforced member reinforced by the method of increasing the cross section on the reinforcing effect so as to evaluate the actual reinforcing effect and change the design if necessary.
The above description is of the preferred embodiment of the present invention, and the description of the specific embodiment is only for better understanding of the idea of the present invention. It will be appreciated by those skilled in the art that various modifications and equivalents may be made in accordance with the principles of the invention and are considered to be within the scope of the invention.
Claims (8)
1. The utility model provides a device is used in test of power transmission tower angle steel reinforcement mechanical properties, characterized by, including amount of deflection measuring instrument, little strain tester, load measuring instrument, displacement tension structure, support one, support two, base, little strain tester installs on support one, and it has the foil gage to paste on the angle steel reinforcement, the foil gage passes through the data line and is connected with little strain tester, is equipped with the fixed plate on support two, and the amount of deflection measuring instrument passes through the fixed plate to be connected on support two, is equipped with the steel sheet installation piece on the base, the one end and the steel sheet installation piece of angle steel reinforcement are connected, and the angle steel reinforcement other end is connected with the amount of deflection measuring instrument through connecting rod one, and the angle steel reinforcement other end is connected with displacement tension structure simultaneously, and.
2. The device for testing the mechanical property of the angle iron reinforcement of the power transmission tower according to claim 1, wherein the strain gauge is attached to the center line of the deformation surface of the angle iron reinforcement.
3. The device for testing the mechanical property of the angle iron reinforcing member of the power transmission tower according to claim 1, wherein the displacement tension structure comprises a steel wire rope, a chain block and a base, the steel wire rope is respectively connected with the angle iron reinforcing member and the first load measuring instrument in a manner of a hook, the chain block is connected with the first load measuring instrument through the steel wire rope, the first load measuring instrument is connected with the second load measuring instrument through a wire, the second load measuring instrument is mounted on a third support, the chain block is connected with the base, and the base is a cement base.
4. The device for testing the mechanical property of the angle iron reinforcement of the transmission tower according to claim 3, wherein the displacement position measured by the deflection gauge is on the same line with the direction of the applied load.
5. The device for testing the mechanical property of the angle iron reinforcement of the power transmission tower according to claim 4, wherein a first lifting lug and a second lifting lug are respectively arranged at the other end of the angle iron reinforcement, the first lifting lug is connected with one side of the angle iron reinforcement in a welding manner, the second lifting lug is connected with the other side of the angle iron reinforcement in a welding manner, the first connecting rod is connected with the first lifting lug, and the steel wire rope is connected with the second lifting lug.
6. The device for testing the mechanical property of the angle iron reinforcing member of the power transmission tower according to claim 5, wherein a load applying position is located at an end portion of the angle iron reinforcing member, and the angle iron reinforcing member is connected with the chain block through a lifting lug, a steel wire rope and a load measuring instrument.
7. The device for testing the mechanical property of the angle iron reinforcement of the power transmission tower according to claim 2, wherein the strain gauge is attached to a plurality of positions on the angle iron reinforcement.
8. The device for testing the mechanical property of the angle iron reinforcement of the power transmission tower according to claim 6, wherein the stress condition of the angle iron is analyzed through a cantilever beam structure and is obtained through the following formula:
1) in the vertical direction, the angle steel reinforcing member is considered to be uniformly distributed with the concentration of q under the action of self gravity, and the bending moment in the vertical direction of the end part of the angle steel reinforcing member is
Deflection of
Wherein L is the length of the extending part of the angle steel reinforcing member, E is the elastic modulus of the material, and I is the inertia moment of the section;
2) in the horizontal direction, the end part of the angle steel reinforcing member is subjected to a pulling force F perpendicular to the extending direction of the reinforcing member, the bending moment of the end part of the angle steel reinforcing member in the horizontal direction is FL, and the deflection is
L is the length of the extending part of the angle steel reinforcing member, E is the elastic modulus of the material, and I is the inertia moment of the section;
3) and comparing the calculation result with the experimental result to obtain the influence of the change of the section moment of inertia of the reinforced member reinforced by the section increasing method on the reinforcing effect so as to evaluate the actual reinforcing effect and change the design as necessary.
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| CN202010535844.1A CN111649884A (en) | 2020-06-12 | 2020-06-12 | Device for testing mechanical property of angle steel reinforcing member of power transmission tower |
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| CN202010535844.1A CN111649884A (en) | 2020-06-12 | 2020-06-12 | Device for testing mechanical property of angle steel reinforcing member of power transmission tower |
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Citations (8)
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Application publication date: 20200911 |
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