CN216694952U - Residual deformation measuring instrument for mechanical connection of steel bars - Google Patents

Residual deformation measuring instrument for mechanical connection of steel bars Download PDF

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Publication number
CN216694952U
CN216694952U CN202220229700.8U CN202220229700U CN216694952U CN 216694952 U CN216694952 U CN 216694952U CN 202220229700 U CN202220229700 U CN 202220229700U CN 216694952 U CN216694952 U CN 216694952U
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metal connecting
connecting rod
steel bar
measuring
clamp
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马毓廷
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University of Science and Technology Beijing USTB
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University of Science and Technology Beijing USTB
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Abstract

The utility model belongs to the technical field of mechanical stretching, and particularly relates to a residual deformation measuring instrument for mechanical connection of reinforcing steel bars, which is used for measuring the residual deformation of a reinforcing steel bar pipe sleeve and comprises a first clamping assembly and a second clamping assembly for respectively clamping reinforcing steel bars at two ends of the pipe sleeve and a residual strain measuring instrument for measuring strain. The residual deformation measuring device is convenient to read data and high in accuracy. By adopting a bilateral synchronous detection method, clamping assemblies are arranged on two sides of a steel bar, the strain of the steel bar is synchronously amplified through a metal connecting rod and received by a residual strain detector, so that deformation data on two sides of a steel bar joint can be obtained, and the requirement on a residual deformation measuring device specified by the industrial standard JGJ107-2010 can be completely met.

Description

Residual deformation measuring instrument for mechanical connection of steel bars
Technical Field
The utility model belongs to the technical field of mechanical stretching, and particularly relates to a residual deformation measuring instrument for mechanical connection of steel bars.
Background
The mechanical connection technology of the steel bars is a new technology of steel bar connection developed and developed abroad in the beginning of the 80 th 20 th century. The working principle is that the force in one reinforcing steel bar is transferred to the other reinforcing steel bar through the mechanical meshing action of the reinforcing steel bars and the connecting piece or the pressure bearing action of the end faces of the reinforcing steel bars, so that the purpose of connecting the stressed reinforcing steel bars is achieved. It has the advantages of simple process, industrial production, no environmental pollution, reliable quality and temperature of the press head, steel and energy saving, etc. The steel bar mechanical connection changes the traditional welding thermal construction operation method, the reliability and plasticity of the joint are superior to those of an electric welding head, the tensile strength is higher than that of a base metal, and the joint can bear the action of repeated dynamic load and high stress fatigue load. In view of the fact that the steel bar joint has great influence on the quality and safety of an engineering structure, JGJ107-2003 general technical regulation for mechanical connection of steel bars, which is mainly compiled by the institute of building science in China, is implemented from 7 months and 1 day in 2003. The specification sets unified regulations for basic performance requirements, inspection and acceptance methods and the like of various types of steel bar mechanical connection joints, promotes reasonable application of mechanical connection technology, and provides reliable basis for performance detection of the joints. In the fifth chapter and the sixth chapter of the new regulations, mechanical connection of reinforcing steel bars is divided into three types of inspection, namely type inspection, process inspection and field inspection according to different inspection purposes and effects.
According to the difference of the performance of the mechanical connection joint, the mechanical connection joint of the steel bar can be divided into a first stage, a second stage and a third stage. The purpose of the type inspection is to grade the joints according to the performance so as to be beneficial to reasonably selecting the joint types according to different application occasions such as the importance and the stress characteristics of the structure, the positions of the joints in the structure and the like. The method is characterized in that the type test of the mechanical connection joint of the steel bar is mainly used for grading various joints by detecting indexes of the strength, the inelastic deformation, the total elongation of a joint test piece and the residual deformation of the joint under test conditions of unidirectional stretching, high-stress repeated tension and compression, large-deformation repeated tension and compression (including fatigue resistance and low temperature resistance if necessary) and the like of the joint.
The type test is complicated and important and should be performed by a detection mechanism approved by national or provincial governing bodies. The test comprises the testing of the static unidirectional tensile property of the joint, the testing of the high stress repeated tension and compression property and the testing of the first-level large deformation repeated tension and compression property. The static unidirectional tensile property is the basic property of the joint when bearing static load, and comprises strength, inelastic deformation and the like. The high-stress repeated tension-compression performance reflects the capability of the high-stress repeated tension-compression of the joint under the conditions of wind load and small earthquake, including residual deformation after 20 times of tension-compression. The large-deformation repeated tension-compression performance is that the stress performance of the joint of the reaction structure in the plastic deformation stage is achieved under the condition of strong earthquake, and the residual deformation comprises the residual deformation after the steel bar is subjected to tension-compression for 4 times and the residual deformation after the steel bar is subjected to tension-compression for 8 times.
The mechanical connection technology of the steel bars developed in the eighties of the last century is widely applied at present. The construction industry standard JGJ107-2010 Rebar mechanical connection technical Specification, which is implemented in 10.1.2010, makes clear regulations on various performance requirements and test methods of mechanical connection joints, wherein the residual deformation of the joints is a very important index for joint type test. The existing measuring method for residual deformation generally adopts the steps of dotting the gauge length of the steel bar or marking the gauge length, and then performing a tensile test on the steel bar. The steel bar is loaded with 0.6 times of standard value of yield strength, and the force is unloaded to zero. And measuring the distance between the dotting lines or the scribing lines, and subtracting the original gauge length to obtain the residual deformation value. This method requires manual measurement and calculation of the residual deformation value. Auxiliary measuring devices such as a measuring device adopting a displacement sensor and an extensometer measuring device are also adopted, the displacement sensor measuring device needs to be installed and clamped according to the original dotting or marking position, and the assembly and disassembly are not very convenient; the whole device is provided with screws of different types, and wrenches of different types are used for fastening, so that the device is very inconvenient for workers with gloves to operate, and the assembly and disassembly time is prolonged; the accuracy of the measurement result is not high, and the requirement of precision research of scientific research institutions cannot be met. The extensometer measuring device needs an A/D conversion module to obtain data because the extensometer outputs analog quantity; the clamping mode of the extensometer can only collect data of one side of the steel bar joint, and cannot meet the requirement on the symmetry of the measuring device specified by the industrial standard JGJ107-2010 and cannot meet the accuracy of measurement; in addition, measure residual deformation with the extensometer, all must the increase gauge length of different degrees, can have unpredictable negative effects to extensometer measurement accuracy behind the increase gauge length.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a residual deformation measuring instrument for mechanical connection of reinforcing steel bars, which solves the problems.
In order to achieve the technical purpose, the technical scheme of the utility model is as follows:
the residual deformation measuring instrument for the mechanical connection of the steel bars is used for measuring the residual deformation of a steel bar pipe sleeve and comprises a first clamping assembly and a second clamping assembly which are used for clamping the steel bars at two ends of the pipe sleeve respectively and a residual strain measurer which is used for measuring strain, and is characterized in that the first clamping assembly and the second clamping assembly comprise:
a clamp end plate;
the metal connecting rod fixing plates are arranged on two sides of the clamp end plate;
the metal connecting rod is arranged between the clamp end plate and the metal connecting rod fixing plate;
the inner hexagon bolt is fixed at the position of the steel bar and is arranged on the clamp end plate; and
the steel bar fastens the inner hexagon bolt and the steel bar loosens the inner hexagon bolt;
the two residual strain gauges are arranged on the metal connecting rod.
As a further optimized scheme, four metal connecting rods are provided, one end of each metal connecting rod is provided with a metal connecting rod fixing latch, the metal connecting rods are symmetrically arranged on two sides of the clamp end plate of the first clamping assembly and the clamp end plate of the second clamping assembly respectively, the metal connecting rods arranged on the first clamping assembly and the second clamping assembly are aligned in pairs, and the axes of the metal connecting rods are parallel to the axis of the pipe sleeve.
As a further optimized scheme, the steel bar position fixing inner hexagonal bolt and the steel bar fastening inner hexagonal bolt are positioned on a parallel line of the axis of the steel bar.
As a further optimized scheme, the residual strain measurer comprises a residual strain measuring clamp arm, a metal connecting rod fixing clamp arranged on the residual strain measuring clamp arm, a clamp fixing knob arranged on the metal connecting rod fixing clamp, and a resistance strain acquisition line arranged on the residual strain measuring clamp arm.
As a further optimized scheme, the two metal connecting rod fixing clamps are respectively fixed on the metal connecting rods on the first clamping component and the second clamping component, and the metal connecting rod fixing clamp is clamped at the metal connecting rod fixing clamping teeth of the metal connecting rods.
As a further optimized scheme, the metal connecting rod fixing plate is connected with the clamp end plate through a fixing bolt, and the metal connecting rod is clamped and fixed with the clamp end plate through the metal connecting rod fixing plate.
As a further optimized scheme, a G-shaped steel bar fixing clamp is arranged inside the clamp end plate.
Due to the adoption of the technical scheme, the utility model has the beneficial effects that:
the residual deformation measuring device is convenient to read data and high in accuracy. By adopting a bilateral synchronous detection method, clamping assemblies are arranged on two sides of the steel bar, the strain of the steel bar is synchronously amplified through a metal connecting rod and received by a residual strain detector, so that deformation data on two sides of a steel bar joint can be obtained, and the requirements of industrial standard JGJ107-2010 on a residual deformation measuring device can be completely met. The steel bar clamping structure is further improved, the operation is simpler and more convenient, and the whole device is very light. According to the utility model, the clamping components are arranged on two sides of the joint of the steel bar, the main structures such as the clamp end plate and the like are fixed at equal distance positions on two sides of the steel bar pipe sleeve, the connection between the clamp end plate and the steel bar is reinforced and fixed by three bolts, namely the inner hexagon bolt fixed at the position of the steel bar, the steel bar fastening inner hexagon bolt and the steel bar loosening inner hexagon bolt, the metal connecting rods symmetrical to the steel bar are arranged on two sides of the clamp end plate, the residual strain detector is arranged at the position where the metal connecting rods are symmetrical to the pipe sleeve, and thus the detection accuracy and sensitivity are improved to the greatest extent.
Drawings
FIG. 1 is a schematic structural diagram of a mechanically connected residual deformation measuring instrument for a reinforcing bar in the embodiment;
FIG. 2 is a schematic top view of the residual deformation measuring instrument for mechanical connection of the reinforcing bar in the embodiment;
FIG. 3 is a left side view of the measuring apparatus for measuring the residual deformation of the mechanical connection of the reinforcing bar in the present embodiment;
FIG. 4 is a schematic right-view structural diagram of the residual deformation measuring instrument for mechanical connection of the reinforcing steel bar in the embodiment;
in the attached drawings, 1, a fixed bolt; 2. a metal connecting rod fixing plate; 3. a metal connecting rod; 4. a G-shaped steel bar fixing clamp is arranged in the steel bar fixing device; 5. fixing the inner hexagon bolt at the position of the steel bar; 6. fastening the inner hexagon bolt by the steel bar; 7. loosening the inner hexagon bolts by the reinforcing steel bars; 8. a clamp fixing knob; 9. a metal connecting rod fixing clamp; 10. a residual strain measuring clamp arm; 11. a resistance strain acquisition line; 12. a clamp end plate; 13. the metal connecting rod fixes the latch; 14. pipe sleeve; 15. and (5) reinforcing steel bars.
Detailed Description
The present invention will be further described with reference to the following embodiments. Wherein the showings are for the purpose of illustration only and are shown by way of illustration only and not in actual form, and are not to be construed as limiting the present patent; to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar components; in the description of the present invention, it should be understood that if there is an orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", etc. based on the orientation or positional relationship shown in the drawings, it is only for convenience of describing the present invention and simplifying the description, but it is not intended to indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and are not to be construed as limiting the present patent, and the specific meaning of the terms may be understood by those skilled in the art according to specific circumstances.
Referring to fig. 1, a residual deformation measuring instrument for mechanical connection of steel bars is used for measuring the residual deformation of a steel bar pipe sleeve, in this embodiment, a first clamping assembly and a second clamping assembly are arranged on steel bars 15 at two ends of a pipe sleeve 14, the first clamping assembly and the second clamping assembly are fixed on the steel bars 15 and have the same distance from the pipe sleeve 14, after the first clamping assembly and the second clamping assembly are fixed, the axes of the first clamping assembly and the second clamping assembly are parallel to each other and are perpendicular to the axis of the steel bars 15, the main bodies of the first clamping assembly and the second clamping assembly are fixture end plates 12, fixing holes for fixing the steel bars 15 are arranged on the fixture end plates 12, a built-in G-shaped steel bar fixing fixture is arranged in the fixing holes, the built-in G-shaped steel bar fixing fixture is used for sheathing the steel bars 15 to increase friction force to prevent sliding, a steel bar position fixing hexagon socket head cap bolt 5 and a steel bar fastening hexagon socket head cap bolt 6 are further arranged on the fixture end plates 12, the steel bar position fixing hexagon socket head cap bolt 5 is used for installing the device on the steel bars 15, the initial position of the device is positioned and fixed to prevent slipping, and the steel bar fastening hexagon socket head cap screw 6 is used for fastening the connection between the clamp end plate 12 and the steel bar 15 after the device is installed; a reinforcing steel bar loosening inner hexagon bolt is further arranged on the clamp end plate 12, is aligned to one end of the built-in G-shaped reinforcing steel bar fixing clamp 4 and is used for assisting in fixing the reinforcing steel bar 15; the metal connecting rods 3 which are symmetrical and parallel to the axis of the steel bar 15 are arranged on two sides of the clamp end plate 12, the metal connecting rods 3 arranged on the first clamping component and the second clamping component are aligned, and the axes of the metal connecting rods 15 arranged on the first clamping component and the second clamping component and positioned on two sides of the steel bar 15 are on the same straight line; the residual strain detector that sets up is connected on the metal connecting rod 3 that sets up with one side of reinforcing bar 15, and all is provided with the residual strain detector on the metal connecting rod 3, and at this moment, the metal connecting rod 3 on residual strain detector will first clamping component and the second clamping component links together.
In the working process, the measuring method of the device is to fasten the reinforcing steel bars 15 at the two ends of the sleeve 14 and apply tension to the reinforcing steel bars 15 at the two ends. The loading system refers to JGJ107-2016 technical specification of mechanical connection of steel bars. The residual deformation measuring device is convenient to read data and high in accuracy. By adopting a bilateral synchronous detection method, clamping assemblies are arranged on two sides of the steel bar, the strain of the steel bar 15 is synchronously amplified through the metal connecting rod 3 and is received by a residual strain detector, so that deformation data on two sides of a steel bar joint can be obtained, and the requirements of industrial standard JGJ107-2010 on a residual deformation measuring device can be completely met. The steel bar clamping structure is further improved, the operation is simpler and more convenient, and the whole device is very light. According to the utility model, the clamping components are arranged on two sides of the joint of the steel bar, the main structures such as the clamp end plate 12 and the like are fixed at equal distance positions on two sides of the steel bar pipe sleeve 14, three bolts including the inner hexagon bolt 5 fixed at the steel bar position, the steel bar fastening inner hexagon bolt 6 and the steel bar loosening inner hexagon bolt 7 are used for reinforcing and fixing the connection between the clamp end plate and the steel bar, metal connecting rods symmetrical to the steel bar are arranged on two sides of the clamp end plate, and the residual strain detector is arranged at a position symmetrical to the metal connecting rod 3 to the pipe sleeve 14, so that the detection accuracy and sensitivity are improved to the greatest extent.
The working principle is as follows: and the two sides of the residual strain measuring clamp are provided with resistance strain gauges for measuring the deformation of the clamp, and then the deformation state of the steel bar sleeve 14 is determined according to the strain-stress relation. When the component deforms, the resistance value of the resistance strain gauge changes correspondingly, then the resistance strain gauge converts the resistance change into the change of voltage (or current), and then the change of voltage (or current) is converted into a strain value or a signal of voltage (or current) in direct proportion to the strain value is output, and the resistance strain acquisition gauge records the signal, so that the deformation of the measured sleeve can be obtained.
In the embodiment, four metal connecting rods 3 are arranged on two sides of the steel bar 15, and are clamped and fixed with the clamp end plate 12 through the metal connecting rod fixing plate 2, and the fixed bolt 1 arranged on the metal connecting rod fixing plate 2 is used for adjusting the distance between the metal connecting rod fixing plate 2 and the clamp end plate 12, so that the purpose of fixing the metal connecting rods 3 is achieved, and the metal connecting rods 3 arranged on two sides of the clamp end plate 12 are the same in distance with the steel bar 15 and are parallel to the steel bar 15; the two metal connecting rods 3 arranged on the first clamping assembly are parallel to the steel bars 15, and the two metal connecting rods 3 arranged on the second clamping assembly are parallel to the steel bars 15; a space is reserved between the metal connecting rods 3 arranged on the first clamping assembly and the second clamping assembly, the metal connecting rods 3 arranged on the first clamping assembly and the second clamping assembly have the axes of the metal connecting rods 3 positioned on the same side of the reinforcing steel bar 15 on the same straight line, and one ends of the four metal connecting rods 3 close to the sleeve 14 are provided with metal connecting rod fixing latch teeth 13; upon detection, the aligned metal tie bar 3 axis changes with the strain of the rebar 15 and sleeve 14.
In this embodiment, the steel bar position fixing hexagon socket head cap screw 5, the steel bar fastening hexagon socket head cap screw 6 and the steel bar loosening hexagon socket head cap screw 7 which are arranged on the clamp end plate 12 are used for fixedly mounting the first clamping assembly and the second clamping assembly on the steel bar 15, a line connecting the steel bar position fixing hexagon socket head cap screw 5 and the steel bar fastening hexagon socket head cap screw 6 is parallel to the axis of the steel bar, and the fixing hexagon socket head cap screw 5 and the steel bar fastening hexagon socket head cap screw 6 which are positioned on the first clamping assembly and the second clamping assembly are positioned on the same straight line; when the anchor clamps end plate 12 is installed on reinforcing bar 15, reinforcing bar position fixing hexagon socket head cap screw 5, reinforcing bar fastening hexagon socket head cap screw 6 and reinforcing bar loosen hexagon socket head cap screw 7 and play and increase progressively the effect to fixed fastness between them.
In this embodiment, the main body part of the residual strain measurer is a residual strain measuring clamp arm 10, and a complete whole is composed of a metal connecting rod fixing clamp 9 arranged on the residual strain measuring clamp arm 10, a clamp fixing knob 8 arranged on the metal connecting rod fixing clamp, and a resistance strain acquisition line 11 arranged on the residual strain measuring clamp arm 10; two metal connecting rod fixing clamps 9 are arranged on the residual strain measuring clamp arm 10, the occlusion force of each metal connecting rod fixing clamp 9 is adjusted by a clamp fixing knob 8, and the metal connecting rod fixing clamps 9 are clamped at metal connecting rod fixing latch teeth 13 of the metal connecting rods 3; the metal connecting rod fixing clamps 9 clamping the first clamping assembly metal connecting rod 3 and the metal connecting rod fixing clamps 9 clamping the second clamping assembly metal connecting rod 3 are at the same distance from the pipe sleeve 14.
The above-described embodiments of the present invention should not be construed as limiting the scope of the present invention. Any other corresponding changes and modifications made according to the technical idea of the present invention should be included in the protection scope of the claims of the present invention.

Claims (7)

1. The residual deformation measuring instrument for the mechanical connection of the steel bars is used for measuring the residual deformation of a steel bar pipe sleeve, and comprises a first clamping component and a second clamping component which are used for clamping the steel bars at two ends of the pipe sleeve respectively and a residual strain measurer which is used for measuring strain, and is characterized in that the first clamping component and the second clamping component comprise:
a clamp end plate;
the metal connecting rod fixing plates are arranged on two sides of the clamp end plate;
the metal connecting rod is arranged between the clamp end plate and the metal connecting rod fixing plate;
the steel bar position is fixed with an inner hexagon bolt which is arranged on the clamp end plate; and
the steel bar fastens the inner hexagon bolt and the steel bar loosens the inner hexagon bolt;
the two residual strain gauges are arranged on the metal connecting rod.
2. The measuring instrument for measuring the residual deformation of the mechanical connection of the steel bars as claimed in claim 1, wherein four metal connecting rods are provided, one end of each metal connecting rod is provided with a metal connecting rod fixing latch, the metal connecting rods are symmetrically arranged on two sides of the clamp end plates of the first clamping assembly and the second clamping assembly respectively, the metal connecting rods arranged on the first clamping assembly and the second clamping assembly are aligned in pairs, and the axes of the metal connecting rods are parallel to the axis of the pipe sleeve.
3. The instrument for measuring residual deformation of mechanical connection of steel bars as claimed in claim 1, wherein the steel bar position fixing hexagon socket head cap screw and the steel bar fastening hexagon socket head cap screw are positioned on the parallel line of the steel bar axis.
4. The measuring instrument for the residual deformation of the mechanical connection of the steel bars as claimed in claim 1, wherein the residual strain measuring instrument comprises a residual strain measuring clamp arm, a metal connecting rod fixing clamp arranged on the residual strain measuring clamp arm, a clamp fixing knob arranged on the metal connecting rod fixing clamp, and a resistance strain collecting wire arranged on the residual strain measuring clamp arm.
5. The measuring instrument for measuring the residual deformation of the mechanical connection of the steel bars as claimed in claim 4, wherein two metal connecting rod fixing clamps are provided and are respectively fixed on the metal connecting rods of the first clamping assembly and the second clamping assembly, and the metal connecting rod fixing clamps are provided at metal connecting rod fixing latch teeth of the metal connecting rods.
6. The apparatus for measuring residual deformation of mechanical connection of steel bars as claimed in claim 1, wherein the metal connecting rod fixing plate is connected with the clamp end plate through a fixing bolt, and the metal connecting rod is clamped and fixed by the metal connecting rod fixing plate and the clamp end plate.
7. The apparatus for measuring residual deformation of mechanical connection of steel bars as claimed in claim 1, wherein the clamp end plate is internally provided with a G-shaped steel bar fixing clamp.
CN202220229700.8U 2022-01-27 2022-01-27 Residual deformation measuring instrument for mechanical connection of steel bars Active CN216694952U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202220229700.8U CN216694952U (en) 2022-01-27 2022-01-27 Residual deformation measuring instrument for mechanical connection of steel bars

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202220229700.8U CN216694952U (en) 2022-01-27 2022-01-27 Residual deformation measuring instrument for mechanical connection of steel bars

Publications (1)

Publication Number Publication Date
CN216694952U true CN216694952U (en) 2022-06-07

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Application Number Title Priority Date Filing Date
CN202220229700.8U Active CN216694952U (en) 2022-01-27 2022-01-27 Residual deformation measuring instrument for mechanical connection of steel bars

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