LU504694B1 - Dynamic and static tensile testing device and method for anchor rods or anchor cables - Google Patents
Dynamic and static tensile testing device and method for anchor rods or anchor cables Download PDFInfo
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- LU504694B1 LU504694B1 LU504694A LU504694A LU504694B1 LU 504694 B1 LU504694 B1 LU 504694B1 LU 504694 A LU504694 A LU 504694A LU 504694 A LU504694 A LU 504694A LU 504694 B1 LU504694 B1 LU 504694B1
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- 230000003068 static effect Effects 0.000 title claims abstract description 37
- 238000009864 tensile test Methods 0.000 title claims abstract description 34
- 238000000034 method Methods 0.000 title claims abstract description 24
- 238000012546 transfer Methods 0.000 claims abstract description 137
- 230000006835 compression Effects 0.000 claims abstract description 103
- 238000007906 compression Methods 0.000 claims abstract description 103
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 52
- 239000010959 steel Substances 0.000 claims abstract description 52
- 230000007246 mechanism Effects 0.000 claims abstract description 46
- 238000012360 testing method Methods 0.000 claims description 69
- 238000004873 anchoring Methods 0.000 claims description 28
- 239000011435 rock Substances 0.000 claims description 22
- 238000009863 impact test Methods 0.000 claims description 12
- 230000000149 penetrating effect Effects 0.000 claims description 9
- 239000003795 chemical substances by application Substances 0.000 claims description 7
- 239000011347 resin Substances 0.000 claims description 4
- 229920005989 resin Polymers 0.000 claims description 4
- 239000004568 cement Substances 0.000 claims description 3
- 238000006073 displacement reaction Methods 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 11
- 238000005516 engineering process Methods 0.000 description 7
- 238000013461 design Methods 0.000 description 4
- 238000000926 separation method Methods 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000013480 data collection Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 239000011083 cement mortar Substances 0.000 description 1
- 238000009533 lab test Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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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
- G01M5/00—Investigating the elasticity of structures, e.g. deflection of bridges or air-craft wings
- G01M5/0025—Investigating the elasticity of structures, e.g. deflection of bridges or air-craft wings of elongated objects, e.g. pipes, masts, towers or railways
-
- 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
- G01M5/0066—Investigating the elasticity of structures, e.g. deflection of bridges or air-craft wings by exciting or detecting vibration or acceleration
-
- 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
- G01M5/0075—Investigating the elasticity of structures, e.g. deflection of bridges or air-craft wings by means of external apparatus, e.g. test benches or portable test systems
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
- G01N2203/0017—Tensile
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/026—Specifications of the specimen
- G01N2203/0262—Shape of the specimen
- G01N2203/0278—Thin specimens
- G01N2203/028—One dimensional, e.g. filaments, wires, ropes or cables
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Aviation & Aerospace Engineering (AREA)
- Engineering & Computer Science (AREA)
- General Health & Medical Sciences (AREA)
- Biochemistry (AREA)
- Analytical Chemistry (AREA)
- Chemical & Material Sciences (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Health & Medical Sciences (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
A dynamic and static tensile testing device and method for anchor rods or anchor cables, device: two fixed bearing platforms with fixed guide rails are fixedly connected to the left and right parts of the upper end of the support base at intervals between the left and right; a compression and tension transfer mechanism is composed of a transverse loading platform, a compression and tension transfer unit, a fixed platform and a hexagonal steel pipe; the lower end of the transverse loading platform is equipped with a transverse chute; inner ends of a pair of transfer platforms are equipped with a pair of guide inclined plates, and a transverse channel is formed between the two; a setting of a fixed platform in conjunction with a pair of transfer platforms; the lower end of the wedge-shaped loading block is equipped with loading ramps on the left and right sides.
Description
DESCRIPTION LU504694
DYNAMIC AND STATIC TENSILE TESTING DEVICE AND METHOD FOR
ANCHOR RODS OR ANCHOR CABLES
The present invention relates to the field of anchor support technology, in particular to a dynamic and static tensile testing device and method for anchor rods or anchor cables.
Anchor rod or anchor cable support is an active reinforcement technology widely used in underground engineering, slope engineering and water conservancy engineering.
The anchoring performance and mechanical behavior of anchor rods or anchor cables in different geological and engineering environments are important basis for the design of anchor support parameters, which are generally obtained through laboratory or on-site testing. However, due to the constraints of engineering conditions, on-site testing often has many uncontrollable factors and poor repeatability, and the testing cost is also high, therefore, the bearing performance of anchor rods or anchor cables is currently mainly obtained through laboratory tests.
In indoor anchoring testing, static tensile testing is the most commonly conducted type. Generally, steel pipes or artificial rock samples (concrete) are used to simulate engineering rock masses, and the anchor rods or anchor cables are anchored to the steel pipes or artificial rock samples using resin anchoring agents or cement mortar.
Then, hollow jacks or electro-hydraulic servo tensile testing machines are used for tensile loading (as shown in Figure 1 and Figure 2), obtaining the interfacial bond slip stress-strain curve of the anchor rods or anchor cables during the drawing process.
When using hollow jacks for loading, due to the limited loading capacity of the jacks and the inability to meet the testing requirements in terms of data acquisition frequency arldJ504694 accuracy, there are often problems with low equipment precision and difficulty in controlling data errors. When using an electro-hydraulic servo testing machine for loading, direct drawing is carried out by clamping the anchored sample at both ends in existing tests. This drawing method, on the one hand, requires a large clamping force at the end, which is prone to stress concentration at the clamping end, resulting in damage of the anchor rods or anchor cables during clamping. On the other hand, due to the limited vertical space of the testing machine, the length of the tested anchoring sample is generally limited to 300-500mm, it is unable to fully restore the on-site anchoring length (2000-3000mm) conditions, thus unable to obtain true test data.
In addition to static tensile testing, in order to obtain the design parameters of rock mass anchorage support under dynamic disaster conditions such as rock burst and shock bump, it is generally necessary to carry out dynamic tensile testing of anchor rods or anchor cables through drop hammer impact test. In the existing drop hammer impact test method, the anchor rod is anchored in a separate steel pipe, and one end of the steel pipe is suspended on the roof of a certain height to raise the drop hammer to a certain height, controlling the power switch to achieve a certain initial velocity for the free fall of the falling hammer, and using the kinetic energy of the falling hammer to impact the anchor rod support plate, thereby achieving dynamic loads of different energies on the anchor rod. In the test, the dynamic load acts on the exposed end of the anchor rod instead of acting on the discontinuity of the surrounding rock, which differs from the actual engineering conditions. In addition, due to the zero load state (i.e. not subjected to pre tension load) of the anchor rods or anchor cables in the existing technology, while the on-site anchor rod or anchor cable is generally subjected to a combined action of a pre tension force of 100-200kN and the additional deformation pressure of the surrounding rock supported by the tunnel, and the impact resistance of anchor rods or anchor cables is much smaller than that of unloaded anchor rods or anchor cables, resulting in inconsistent test results with actual conditions.
Based on the above shortcomings, there is an urgent need for a set of anchor rods or anchor cables tensile testing device that can truly restore the actual working state of anchor rods or anchor cables (as shown in Figure 3), and can also be applied to tHéJ504694 conventional rock mechanics testing machine, so as to better study the mechanical properties and deformation characteristics of the anchor rod or anchor cable anchor solid under different dynamic and static load conditions, and provide a theoretical basis for the support design and failure control of the anchor rods or anchor cables.
In response to the problems existing in the existing technology mentioned above, the present invention provides a dynamic and static tensile testing device and method for anchor rods or anchor cables. The device has a reasonable structure, convenient operation, and can truly restore the actual working state of the anchor rods or anchor cables. It can better study the mechanical and deformation characteristics of the anchor rod or anchor cable anchor solid under different dynamic and static load conditions, and provide a theoretical basis for the design and failure control of the anchor rod or anchor cable support. This method is simple in steps and operation, and can effectively conduct tensile testings on anchor rods or anchor cables, which helps to obtain anchor support parameters under real application conditions.
In order to achieve the above objectives, the present invention provides a dynamic and static tensile testing device for anchor rods or anchor cables, including a support base, a fixed bearing platform, a compression and tension transfer mechanism, and a wedge-shaped loading block;
The length direction of the support base extends in the left and right directions; The fixed bearing platform is horizontally arranged, and its upper end is fixedly connected with fixed guide rails extending in the left and right directions; two fixed bearing platforms are fixedly connected to the left and right parts of the upper end of the support base, with left and right intervals between them;
The number of the compression and tension transfer mechanism is two, and the compression and tension transfer mechanism is composed of a transverse loading platform, a compression and tension transfer unit, a fixed platform, and a hexagonal steel pipe; the transverse loading platform is horizontally arranged, and the lower end 180504694 provided with a transverse chute extending in the left and right directions; the compression and tension transfer unit is composed of a pair of transfer platforms fixedly connected to the upper part of the inner end of the transverse loading platform at intervals between the front and back. One side of the inner end of the pair of transfer platforms has a pair of guide inclined plates with high exterior and low interior, and a transverse channel is formed between the pair of transfer platforms; the fixed platform and the compression and tension transfer unit are fixedly connected to the upper part of the outer end of the transverse loading platform, and a transverse through-hole is opened in the center corresponding to the transverse channel; the outer edge of the hexagonal steel pipe section is a regular hexagonal in shape, which is horizontally arranged between the compression and tension transfer unit and the fixed platform; the inner end is fixedly connected in a transverse channel between a pair of transfer platforms, and the outer end is fixedly connected to one side of the inner end of the fixed platform. The inner cavity of the hexagonal steel pipe is axially arranged with the transverse through-hole;
Two compression and tension transfer mechanisms are arranged opposite to each other above the two fixed bearing platforms, and the transverse loading platform is sheathed on the fixed guide rail through a transverse chute to achieve sliding fit between the compression and tension transfer mechanism and the fixed bearing platform in the left and right directions;
The upper end of the wedge-shaped loading block is a horizontally extending planar structure, and the upper left and upper right ends are both vertically extending planar structures; the lower left and lower right ends are both loading ramps with high external and low internal inclination; the middle part of the lower end corresponds to a transverse channel with a transverse slot connected in the left and right directions; the lower end of the wedge-shaped loading block is arranged between the upper ends of two compression and tension transfer units, and the loading ramps on both sides slide fit with the opposite side of the guide inclined plate in the two compression and tension transfer units.
As a preferred choice, the support base is composed of a support base plate, twdJ504694 support top plates, and two vertical brackets; the two support top plates are spaced on the left and right sides above the support base plate; the two vertical brackets are arranged below the two support top plates, and the upper end of the vertical bracket is fixedly connected to the lower end face of the support top plate, while the lower end of the vertical bracket is fixedly connected to the upper end face of the support base plate; the middle part of the upper end of the support base plate is fixedly connected with a limit block No.1 between two vertical brackets, and the height of the limit block No.1 is lower than the height of the vertical bracket.
Further, in order to facilitate assembly and separation, bolt holes No.1 matching with a rock mechanics testing machine or a drop hammer impact testing platform is arranged on the periphery of the support base plate; multiple bolt holes No.2 are arranged on the support top plate; the fixed bearing platform is provided with multiple bolt holes No.3, and is fixedly connected to the support base through connecting bolts No.1 penetrating through bolt holes No.3 and No.2.
Furthermore, in order to facilitate assembly and separation, the transverse loading platform is equipped with multiple bolts No.4; the transfer platform is provided with multiple bolt holes No.5, which are fixedly connected to the transverse loading platform through connecting bolts No.2 penetrating through bolt holes No.4 and No.5; the fixed platform is provided with multiple bolt holes No.6, and is fixedly connected to the transverse loading platform through connecting bolts No.3 penetrating through bolt holes
No.4 and No.6.
Furthermore, in order to ensure the stability and reliability of the sliding fit between the compression and tension transfer mechanism and the fixed bearing platform, the cross sections of the fixed guide rail and the transverse chute are both in a dovetail shape.
Furthermore, in order to timely limit the longitudinal position of the wedge-shaped loading block when the test reaches the set state, in the same compression and tension transfer unit, the upper ends of a pair of guide inclined plates are all planar structures; the upper left and right sides of the wedge-shaped loading block are respectively fixedly connected with a pair of limit blocks No.2 arranged in front and back intervals; a pair bË504694 limit blocks No.2 on the same side are matched with the upper limit of a pair of guide inclined plates in the same compression and tension transfer unit.
Furthermore, in order to facilitate radial positioning of the hexagonal steel pipe and axial positioning of the inner end of the hexagonal steel pipe, the transfer platform further includes a transfer connecting plate located at the bottom, a vertical plate located on the outer side of the guide inclined plate, and a reinforced connecting plate located on the outer side of the vertical plate. The transfer connecting plate is fixedly connected to the transverse loading platform, and the lower end of the guide inclined plate is fixedly connected to the inner end of the upper end face of the transfer connecting plate, the lower end of the vertical plate is fixedly connected to the middle of the upper end face of the transfer connecting plate, and the upper end is connected to the upper end of the guide inclined plate, which is a planar structure; one end of the reinforced connecting plate is fixedly connected to the outer end of the upper end face of the transfer connecting plate, and the other end is fixedly connected to the outer side face of the vertical plate; in the same compression and tension transfer unit, a pair of limit card slots are set at the opposite ends of the two vertical plates between a pair of transfer platforms; the inner end of the hexagonal steel pipe is fixedly installed in a pair of limit slots, and is limited through a pair of limit slots.
In the present invention, the setting of the support base can provide stable and reliable support for the testing device; a fixed bearing platform with a fixed guide rail is fixedly connected to the upper end of the bottom support, and a transverse chute is set at the bottom of the sliding bearing platform in the compression and tension transfer mechanism to match the fixed guide rail, which can achieve lateral sliding between the compression and tension transfer mechanism and the fixed bearing platform in the left and right directions; by setting a guide inclined plate at the inner end of the transfer platform in the compression and tension transfer mechanism, a wedge-shaped groove can be formed between the two compression and tension transfer mechanisms. At the same time, loading ramps are set on both sides of the lower end of the wedge-shaped loading block, which can convert the vertical load applied to the top of the wedge-shaped loading block into a lateral load applied to the two compression and tension transfélJ504694 mechanisms, and the static and dynamic compression load on the top of the wedge-shaped loading block can be converted into a pair of static and dynamic tensile loads acting on two hexagonal steel pipes, so that tensile loads can be applied to the anchor rod or anchor cable without the need for clamping.
This avoids the possibility of failure due to stress concentration at the clamping point in existing tensile testing methods, and facilitates the selection of conventional universal mechanical testing machines as loading sources, it can solve the problems of limited loading capacity, low loading accuracy, and low data collection frequency of existing hollow jacks.
By opening a transverse slot in the middle of the lower end of the wedge-shaped loading block corresponding to the transverse channel in the left and right directions, it is possible to prevent vertical compression of the anchor rod or anchor cable to be tested during the movement of the wedge-shaped loading block downwards, thereby further ensuring that the tensile testing is not interfered by vertical loads and ensuring the accuracy of the tensile testing; in addition, due to the fact that the present invention only requires a testing machine to provide compressive load and has low requirements for testing equipment, the testing machine does not need to have tensile function and can be widely used in various specifications of universal testing machines.
Moreover, due to the horizontal placement of anchor rods or anchor cable anchoring specimens for testing, the space in the vertical direction is not limited, and static tensile strength testing of large anchoring length anchor rods or anchor cables can be achieved, solved the limitation of existing testing devices on testing length.
Furthermore, due to the use of two separated hexagonal steel pipes to simulate the surrounding rock, the exposed end of one side of the anchor rod or anchor cable can be used to simulate the exposed end of the on-site anchor rod or anchor cable, and fixed with a fixed nut on one side of the fixed platform, which can effectively simulate the support plate and conveniently apply pre tension.
The applied drawing force is located in the middle of the anchor rod or anchor cable anchoring specimen, rather than at one end of the anchor rod or anchor cable in the existing technology, and the actual working state of the on-site anchor rod or anchor cable is more consistent, so the obtained mechanical behavior of the anchor rod or anchor cable anchoring is more reliable and accurate. The present invention can also B&J504694 installed in a drop hammer testing machine, which can convert the impact force formed by the drop hammer into dynamic drawing force, thereby obtaining the dynamic drawing mechanical behavior of anchor rods or anchor cables. The present invention provides a dynamic and static tensile testing device for anchor rods or anchor cables that utilizes compression and tension conversion loading. The device has a simple structure, convenient operation, and is easy to promote and apply in various conventional mechanical testing machines. To sum up, the invention can overcome the technical problems of the existing bolt or cable tensile testing, such as the concentration of clamping stress, the limitation of anchorage length, and the inability to restore the actual working state of the bolt or cable. The invention has simple structure and convenient operation, and can be applied to various conventional rock mechanics testing machines and drop hammer impact testing machines.
The present invention also provides a dynamic and static tensile testing method for anchor rods or anchor cables, comprising the following steps:
Step 1: fixing the support base plate on the rock mechanics pressure testing machine or drop hammer impact test platform through fastening bolts to fix the support base; then, fixing and connecting the two fixed bearing platforms to the upper ends of the two support top plates through connecting bolts No.1; then, the transverse loading platforms in the two compression and tension transfer mechanisms are slidably assembled on the two fixed bearing platforms, and the compression and tension transfer units in the two compression and tension transfer mechanisms are fixedly connected to the inner end of the transverse loading platform through connecting bolts No.2, so that the inner end of the hexagonal steel pipe is fixedly clamped in a pair of limit slots between a pair of transfer platforms;
Step 2: First, threading the anchor rod or anchor cable to be tested through the transverse channels in two compression and tension transfer units into two hexagonal steel pipes, and sliding and adjusting the position of the two fixed bearing platforms to maintain the two fixed bearing platforms in a state of contact. Ensuring that the two ends of the anchor rod or anchor cable to be tested are exposed to the outside of the outer ends of the two hexagonal steel pipes respectively; then, resin anchoring agent 61504694 cement-based anchoring agent is used to anchor the anchor rod or anchor cable to the hexagonal steel pipe in two compression and tension transfer mechanisms, as the anchoring test piece to be tested;
Step 3: Installing the transverse through-hole of the fixed platform in the compression and tension transfer mechanism on the outside of the exposed end of the anchor rod or anchor cable, adjusting the position of the fixed platform so that the inner side of the fixed platform is connected to the outer end of the hexagonal steel pipe, and then connecting the fixed platform to the transverse loading platform through the connecting bolt No.3 to coordinate with the compression and tension transfer unit for axial positioning of the hexagonal steel pipe;
Step 4: Installing the pressure sensor on the outside of the exposed end of the anchor rod or anchor cable with a threaded section, and connecting it to one side of the outer end of the fixed platform. Then, connecting the fixed nut to the outside of the exposed end of the anchor rod or anchor cable through a threaded fit, and making the inner side of the nut contact the outer end of the pressure sensor; during this process, a fixed platform on one side of the pressure sensor is installed to simulate the fixed support plate;
Step 5: Tightening the fixed nut using a torque wrench or tensioning instrument to apply a set pre tightening force to the anchor rod or anchor cable, simulating the actual working state of the anchor rod or anchor cable; assembling the wedge-shaped loading block between the upper ends of the two compression and tension transfer units, and making the loading ramps on both sides fit with the opposite side of the guide inclined plate in the two compression and tension transfer units;
Step 6: Starting the rock mechanics testing machine or the drop hammer impact testing machine to apply static and dynamic compression loads on the top of the wedge-shaped loading block. The wedge-shaped loading block converts the static and dynamic compression loads P into a pair of symmetrical tensile loads T acting on the inner ends of two hexagonal steel pipes through the compression and tension transfer mechanism. By recording the vertical pressure and displacement applied by the testing machine, and combining the pressure value of the pressure sensor, the stress-stralrV504694 relationship of the anchor rod or anchor cable during the drawing process can be obtained.
The present invention has simple steps and can convert vertical pressure into two horizontal tensile forces acting on the middle of the anchor rod or anchor cable anchoring specimen, thereby solving the technical problem that existing testing devices cannot restore the actual working state of the anchor rod or anchor cable. Moreover, due to the horizontal placement of the anchor rod or anchor cable anchoring specimen for testing, the space in the vertical direction is not limited, it can achieve static tensile strength testing of anchor rods or anchor cables with large anchoring lengths, solving the limitations of existing testing devices on the testing length. At the same time, the present invention is easy to operate and can quickly and accurately obtain the stress-strain relationship of the anchor rod or anchor cable during the drawing process. It can be applied to various conventional mechanical testing machines and has great promotion and application value.
Figure 1 is a schematic diagram of the structure of the existing technology using an electro-hydraulic servo tensile testing machine for tensile loading;
Figure 2 is a structural schematic diagram of using a hollow jack for tensile loading in prior art;
Figure 3 is a schematic diagram of the actual working state of the anchor rod or anchor cable under stress;
Figure 4 is a structural schematic diagram of the present invention;
Figure 5 is a structural schematic diagram of the support base in the present invention;
Figure 6 is a structural schematic diagram of the support base and two fixed bearing platforms in the present invention;
Figure 7 is a structural schematic diagram of the compression and tension transfélJ504694 mechanism of the present invention;
Figure 8 is a structural schematic diagram of the compression and tension transfer mechanism of the present invention, in which hexagonal steel pipes are removed;
Figure 9 is a structural schematic diagram of a hexagonal steel pipe in the present invention;
Figure 10 is a structural schematic diagram of the wedge-shaped loading block in the present invention;
Figure 11 is a structural schematic diagram of the compression and tension transfer unit of the present invention.
In the figure: 1. Support base, 2. Compression and tension transfer mechanism, 3.
Wedge-shaped loading block, 4. Fixed bearing platform, 5. Hexagonal steel pipe, 6.
Anchor rod or anchor cable, 7. Fixed platform, 8. Pressure sensor, 9. Fixed nut, 10.
Fixed guide rail, 11. Transverse loading platform, 12. Compression and tension transfer unit, 13. Transverse chute, 14. Guide inclined plate, 15. Transfer platform, 16. Loading ramp, 17. Transverse channel, 18. Transverse through-hole, 19 Transverse slot, 20.
Support base plate, 21. Support top plate, 22. Vertical bracket, 23. Limit block No.1, 24.
Bolt hole No.1, 25. Bolt hole No.2, 26. Limit block No.2, 27. Limit card slot, 28. Transfer connecting plate, 29. Vertical plate, 30. Reinforced connecting plate, 31. Groove space, 32. Bolt hole No.3.
The present invention will be further explained in conjunction with the accompanying drawings.
As shown in Figures 4 to 11, the present invention provides a dynamic and static tensile testing device for anchor rods or anchor cables, including a support base 1, a fixed bearing platform 4, a compression and tension transfer mechanism 2, and a wedge-shaped loading block 3;
The length direction of the support base 1 extends in the left and right directionklJ504694 and the central area is provided with a downward concave groove space 31; the fixed bearing platform 4 is horizontally arranged, and its upper end is fixedly connected with a fixed guide rail 10 extending in the left and right directions. As a preferred method, the two ends of the fixed guide rail 10 are respectively flush with the two ends of the fixed bearing platform 4; two fixed bearing platforms 4 are fixedly connected to the left and right ends of the upper end of the support base 1 at intervals. As a further optimization, the inner ends of the two fixed bearing platforms 4 are flush with the left and right ends of the groove space 31, respectively;
The number of the compression and tension transfer mechanism 2 is two, and the compression and tension transfer mechanism 2 is composed of a transverse loading platform 11, a compression and tension transfer unit 12, a fixed platform 7, and a hexagonal steel pipe 5; the transverse loading platform 11 is horizontally arranged, and its lower end is provided with a transverse chute 13 extending in the left and right directions; the compression and tension transfer unit 12 is composed of a pair of transfer platforms 15 fixedly connected to the upper part of the inner end of the transverse loading platform 11 in front and back intervals. One side of the inner end of the pair of transfer platforms 15 has a pair of guide inclined plates 14 with high exterior and low interior, and a transverse channel 17 is formed between the pair of transfer platforms 15.
The size of the transverse channel 17 is slightly larger than the size of the anchor rod or anchor cable 6 to ensure that there is no interference in the transverse channel 17 during the testing process; the fixed platform 7 is fixedly connected to the upper part of the outer end of the transverse loading platform 11 opposite to the compression and tension transfer unit 12, and the center of the fixed platform 7 corresponds to the transverse channel 17 with a transverse through-hole 18 opened; the outer edge of the cross-section of the hexagonal steel pipe 5 is a regular hexagonal in shape, which is horizontally arranged between the compression and tension transfer unit 12 and the fixed platform 7. Its inner end is fixedly connected to the transverse channel 17 between a pair of transfer platforms 15, and its outer end is fixedly connected to one side of the inner end of the fixed platform 7. The inner cavity of the hexagonal steel pipe 5 is axiallyJ504694 arranged with the transverse through-hole 18;
Two compression and tension transfer mechanisms 2 are arranged opposite to each other above the two fixed bearing platforms 4, and the transverse loading platform 11 is sliding on the fixed guide rail 10 through the transverse chute 13 to achieve sliding fit between the compression and tension transfer mechanism 2 and the fixed bearing platform 4 in the left and right directions;
The upper end of the wedge-shaped loading block 3 is a horizontally extending planar structure, and the upper left and right ends are both vertically extending planar structures. The lower left and right ends are both loading ramps 16 with high external and low internal inclination. The middle part of the lower end corresponds to the transverse channel 17 and is provided with a transverse slot 19 connected in the left and right directions; the V-shaped structure is formed by the intersection of the loading ramp 16 on the left side of the wedge-shaped loading block 3 and the bottom end of the loading ramp 16 on the right side; the lower end of the wedge-shaped loading block 3 is arranged between the upper ends of two compression and tension transfer units 12, and the loading ramps 16 on both sides slide and fit with the opposite side of the guide inclined plate 14 in the two compression and tension transfer units 12.
As a preferred option, the support base 1 is composed of a support base plate 20, two support top plates 21, and two vertical brackets 22. The two support top plates 21 are spaced on the left and right sides above the support base plate 20; two vertical brackets 22 are correspondingly arranged below the two support top plates 21, and the upper end of the vertical bracket 22 is fixedly connected to the lower end face of the support top plate 21, while the lower end of the vertical bracket 22 is fixedly connected to the upper end face of the support base plate 20; the middle part of the upper end of the support base plate 20 is fixedly connected with a limit block No.1 23 between two vertical brackets 22, and the height of the limit block No.1 23 is lower than the height of the vertical bracket 22; as a preferred option, the inner ends of the two support top plates 21 and the inner ends of the two vertical brackets 22 are correspondingly arranged flush,
and the groove space 31 is formed in the space between the limit block No.1 23, the twdJ504694 vertical brackets 22, and the two support top plates 21.
In order to facilitate assembly and separation, the support base plate 20 is provided with bolt holes No.1 24 matched with the rock mechanics testing machine or the drop hammer impact test platform on the periphery; multiple bolt holes No.2 25 are arranged on the support top plate 21; the fixed bearing platform 4 is provided with multiple bolt holes No.3 32, and is fixedly connected to the support base 1 through a connecting bolt
No.1 penetrating through bolt holes No.3 32 and bolt holes No.2 25.
In order to facilitate assembly and separation, multiple bolts No.4 are arranged on the transverse loading platform 11; the transfer platform 15 is provided with multiple bolt holes No.5, which are fixedly connected to the transverse loading platform 11 through connecting bolts No.2 penetrating through bolt holes No.4 and No.5; the fixed platform 7 is provided with multiple bolt holes No.6, and is fixedly connected to the transverse loading platform 11 through connecting bolts No.3 penetrating through bolt holes No.4 and No.6.
In order to ensure the stability and reliability of the sliding fit between the compression and tension transfer mechanism and the fixed bearing platform, the cross sections of the fixed guide rail 10 and the transverse chute 13 are both dovetail shaped.
In order to timely limit the longitudinal position of the wedge-shaped loading block when the test reaches the set state, in the same compression and tension transfer unit 12, the upper ends of a pair of guide inclined plates 14 are all planar structures; the upper left and right sides of the wedge-shaped loading block 3 are respectively fixedly connected with a pair of limit blocks No.2 26 arranged in front and back intervals; a pair of limit blocks No.2 26 on the same side are respectively matched with the upper limit of a pair of guide inclined plates 14 in the same compression and tension transfer unit 12.
When the limit block No.2 26 is in contact with the upper end of the guide inclined plate 14, the wedge-shaped loading block 3 reaches the maximum downward stroke. At this time, the upper end of the transverse slot 19 is in a gap fit with the anchor rod or anchor cable 6 to be tested.
In order to facilitate radial positioning of the hexagonal steel pipe and axial504694 positioning of the inner end of the hexagonal steel pipe, the transfer platform 15 also includes a transfer connecting plate 28 located at the bottom, a vertical plate 29 located on the outer side of the guide inclined plate 14, and a reinforced connecting plate 30 located on the outer side of the vertical plate 29. The transfer connecting plate 28 is fixedly connected to the transverse loading platform 11, the lower end of the guide inclined plate 14 is fixedly connected to the inner end of the upper end face of the transfer connecting plate 28, the lower end of the vertical plate 29 is fixedly connected to the middle of the upper end face of the transfer connecting plate 28, and the upper end is connected to the upper end of the guide inclined plate 14, which is a planar structure; one end of the reinforced connecting plate 30 is fixedly connected to the outer end of the upper end face of the transfer connecting plate 28, and the other end is fixedly connected to the outer side face of the vertical plate 29; in the same compression and tension transfer unit 12, a pair of limit card slots 27 are opened at the opposite ends of two vertical plates 29 between a pair of transfer platforms 15; the inner end of the hexagonal steel pipe 5 is fixedly installed in a pair of limit slots 27, and is limited by a pair of limit slots 27 to prevent the hexagonal steel pipe 5 from rotating radially. This ensures that the hexagonal steel pipe 5 can be stably fixed axially and radially through a pair of compression and tension transfer units (12) and a fixing platform (7). Due to the fixed connection between the lower end of the guide inclined plate 14 and the lower end of the vertical plate 29 and the transfer connecting plate 28, and the fixed connection between the upper end of the guide inclined plate 14 and the upper end of the vertical plate 29, a stable triangular structure is formed, which can effectively bear the load during the vertical load loading process and convert it into lateral thrust. By strengthening the setting of connection plate 30, it can support the outer side of vertical plate 29, thereby ensuring the bearing strength of vertical plate 29. At the same time, it can transfer the force carried by vertical plate 29 to the transfer connection plate 28, thereby better converting vertical load into horizontal thrust.
In the present invention, the setting of the support base can provide stable and reliable support for the testing device; a fixed bearing platform with a fixed guide rail is fixedly connected to the upper end of the bottom support, and a transverse chute is seU504694 at the bottom of the sliding bearing platform in the compression and tension transfer mechanism to match the fixed guide rail, which can achieve lateral sliding between the compression and tension transfer mechanism and the fixed bearing platform in the left and right directions; by setting a guide inclined plate at the inner end of the transfer platform in the compression and tension transfer mechanism, a wedge-shaped groove can be formed between the two compression and tension transfer mechanisms.
At the same time, loading ramps are set on both sides of the lower end of the wedge-shaped loading block, which can convert the vertical load applied to the top of the wedge-shaped loading block into a lateral load applied to the two compression and tension transfer mechanisms, The static and dynamic compression load on the top of the wedge-shaped loading block can be converted into a pair of static and dynamic tensile loads acting on two hexagonal steel pipes, so that tensile loads can be applied to the anchor rod or anchor cable without the need for clamping.
This avoids the possibility of failure due to stress concentration at the clamping point in existing tensile testing methods, and facilitates the selection of conventional universal mechanical testing machines as loading sources, it can solve the problems of limited loading capacity, low loading accuracy, and low data collection frequency of existing hollow jacks.
By opening a transverse slot in the middle of the lower end of the wedge-shaped loading block corresponding to the transverse channel in the left and right directions, it is possible to prevent vertical compression of the anchor rod or anchor cable to be tested during the movement of the wedge-shaped loading block downwards, thereby further ensuring that the tensile testing is not interfered by vertical loads and ensuring the accuracy of the tensile testing; in addition, due to the fact that the present invention only requires a testing machine to provide compressive load and has low requirements for testing equipment, the testing machine does not need to have tensile function and can be widely used in various specifications of universal testing machines.
Moreover, due to the horizontal placement of anchor rods or anchor cable anchoring specimens for testing, the space in the vertical direction is not limited, and static tensile strength testing of large anchoring length anchor rods or anchor cables can be achieved, Solved the limitation of existing testing devices on testing length. Furthermore, due to the use of two separatéd/504694 hexagonal steel pipes to simulate the surrounding rock, the exposed end of one side of the anchor rod or anchor cable can be used to simulate the exposed end of the on-site anchor rod or anchor cable, and fixed with a fixed nut on one side of the fixed platform, which can effectively simulate the support plate and conveniently apply pre tension. The applied drawing force is located in the middle of the anchor rod or anchor cable anchoring specimen, rather than at one end of the anchor rod or anchor cable in the existing technology, the actual working state of the on-site anchor rod or anchor cable is more consistent, so the obtained mechanical behavior of the anchor rod or anchor cable anchoring is more reliable and accurate. The present invention can also be installed in a drop hammer testing machine, which can convert the impact force formed by the drop hammer into dynamic drawing force, thereby obtaining the dynamic drawing mechanical behavior of anchor rods or anchor cables. The invention provides a dynamic and static tensile testing device for anchor rods or anchor cables loaded by pressure tension conversion, which has simple structure and convenient operation, and is convenient to be popularized and applied to various conventional rock mechanics testing machines. To sum up, the invention can overcome the technical problems of the existing bolt or anchor cable tensile testing, such as the concentration of clamping stress, the limitation of anchorage length, and the inability to restore the actual working state of the bolt or anchor cable. The invention has simple structure and convenient operation, and can be applied to various conventional rock mechanics testing machines and drop hammer impact testing machines.
The present invention also provides a dynamic and static tensile testing method for anchor rods or anchor cables, comprising the following steps:
Step 1: fixing the support base plate 20 on the rock mechanics pressure testing machine or the drop hammer impact test platform through the fastening bolts to fix the support base 1; then, fixing and connecting the two fixed bearing platforms 4 to the upper ends of the two support top plates 21 through connecting bolts No.1; then, the transverse loading platforms 11 of the two compression and tension transfer mechanisms 2 are slidably assembled on the two fixed bearing platforms 4, and the compression and tension transfer units 12 of the two compression and tension transfét)504694 mechanisms 2 are fixedly connected to the inner end of the transverse loading platform 11 through connecting bolts No.2, so that the inner end of the hexagonal steel pipe 5 is fixedly clamped in a pair of limit slots 27 between a pair of transfer platforms 15, in order to radially position the hexagonal steel pipe 5;
Step 2: First, threading the tested anchor rod or anchor cable 6 through the transverse channels 17 in the two compression and tension transfer units 12 into the two hexagonal steel pipes 5, and sliding and adjusting the positions of the two fixed bearing platforms 4 to maintain the two fixed bearing platforms 4 in a state of contact. Ensuring that the two ends of the tested anchor rod or anchor cable 6 are exposed to the outer ends of the two hexagonal steel pipes 5, respectively; then using resin anchoring agent or cement-based anchoring agent to anchor the anchor rod or anchor cable 6 to the hexagonal steel pipe 5 in two compression and tension transfer mechanisms 2, as the anchoring test piece to be tested;
Step 3: Installing the transverse through-hole 18 of the fixed platform 7 in the compression and tension transfer mechanism 2 onto the outside of the exposed end of the anchor rod or anchor cable 6, adjusting the position of the fixed platform 7 so that the inner end of the fixed platform 7 is connected to the outer end of the hexagonal steel pipe 5, and then connecting the fixed platform 7 to the transverse loading platform 11 through the connecting bolt No.3 to coordinate with the compression and tension transfer unit 12 for axial positioning of the hexagonal steel pipe 5;
Step 4: Installing the pressure sensor 8 on the outside of the exposed end of the anchor rod or anchor cable 6 with a threaded section, and connecting it to one side of the outer end of the fixed platform 7. Then, connecting the fixed nut 9 to the outside of the exposed end of the anchor rod or anchor cable 6 through a threaded fit, and making the inner side of it contact the outer end of the pressure sensor 8; during this process, a fixed platform 7 on one side of the pressure sensor 8 is installed to simulate a fixed support plate:
Step 5: Tightening the fixed nut 9 using a torque wrench or tensioning instrument to apply a set pre tightening force to the anchor rod or anchor cable, simulating the actual working state of the anchor rod or anchor cable 6; assembling the wedge-shapdd)504694 loading block 3 between the upper ends of the two compression and tension transfer units 12, and making the loading ramps 16 on both sides fit with the opposite side of the guide inclined plates 14 in the two compression and tension transfer units 12;
Step 6: Starting the rock mechanics testing machine or the drop hammer impact testing machine to apply static and dynamic compression loads on the top of the wedge-shaped loading block 3. The wedge-shaped loading block 3 converts the static and dynamic compression loads P into a pair of symmetrical tensile loads T acting on the inner ends of two hexagonal steel pipes 5 through the compression and tension transfer mechanism 2. By recording the vertical pressure and displacement applied by the testing machine, and combining the pressure value of pressure sensor 8, the stress-strain relationship of the anchor rod or anchor cable 6 during the drawing process can be obtained.
The present invention has simple steps and can convert vertical pressure into two horizontal tensile forces acting on the middle of the anchor rod or anchor cable anchoring specimen, thereby solving the technical problem that existing testing devices cannot restore the actual working state of the anchor rod or anchor cable. Moreover, due to the horizontal placement of the anchor rod or anchor cable anchoring specimen for testing, the space in the vertical direction is not limited, it can achieve static tensile strength testing of anchor rods or anchor cables with large anchoring lengths, solving the limitations of existing testing devices on the testing length. At the same time, the present invention is easy to operate and can quickly and accurately obtain the stress-strain relationship of the anchor rod or anchor cable during the drawing process. It can be applied to various conventional mechanical testing machines and has great promotion and application value.
Claims (8)
1. A dynamic and static tensile testing device for anchor rods or anchor cables, including a support base (1), wherein the length direction of the support base (1) extends in left and right directions; which is characterized in that it also includes a fixed bearing platform (4), a compression and tension transfer mechanism (2) and a wedge-shaped loading block (3); the fixed bearing platform (4) is horizontally arranged, and its upper end is fixedly connected with a fixed guide rail (10) extending in the left and right directions; two fixed bearing platforms (4) are fixedly connected to left and right parts of the upper end of the support base (1) at intervals between the left and right; the number of the compression and tension transfer mechanism (2) is two, and the compression and tension transfer mechanism (2) is composed of a transverse loading platform (11), a compression and tension transfer unit (12), a fixed platform (7), and a hexagonal steel pipe (5); the transverse loading platform (11) is horizontally arranged, and its lower end is provided with a transverse chute (13) extending in left and right directions; the compression and tension transfer unit (12) is composed of a pair of transfer platforms (15) fixedly connected to the upper part of the inner end of the transverse loading platform (11) at intervals between front and back, and the inner side of the pair of transfer platforms (15) has a pair of guide inclined plates (14) with high exterior and low interior, and a transverse channel (17) is formed between the pair of transfer platforms (15); the fixed platform (7) is fixedly connected to the upper part of the outer end of the transverse loading platform (11) opposite to the compression and tension transfer unit (12), and the central part corresponding to the transverse channel (17) is provided with a transverse through-hole (18); the outer edge of the cross-section of the hexagonal steel pipe (5) is a regular hexagonal in shape, which is horizontally arranged between the compression and tension transfer unit (12) and the fixed platform (7), and its inner end is fixedly connected in the transverse channel (17) between the pair of transfer platforms (15), and its outer end is fixedly connected to one side of the inner end of the fixed platform (7), and the inner cavity of the hexagonal steel pipe (5) is axially504694 arranged with the transverse through-hole (18); the two compression and tension transfer mechanisms (2) are arranged opposite to each other above the two fixed bearing platforms (4), and the transverse loading platform (11) is sliding on the fixed guide rail (10) through a transverse chute (13) to achieve sliding fit between the compression and tension transfer mechanism (2) and the fixed bearing platform (4) in the left and right directions; the upper end of the wedge-shaped loading block (3) is a horizontally extending planar structure, and the upper left and right ends are both vertically extending planar structures, and the lower left and right ends are both loading ramps (16) with high external and low internal inclination, and the middle part of the lower end corresponds to the transverse channel (17) and is provided with a transverse slot (19) connected in the left and right directions; the lower end of the wedge-shaped loading block (3) is arranged between the upper ends of two compression and tension transfer units (12), and the loading ramps (16) on both sides slide fit with the opposite side of the guide inclined plate (14) in the two compression and tension transfer units (12).
2. The dynamic and static tensile testing device for anchor rods or anchor cables according to claim 1, characterized in that the support base (1) is composed of a support base plate (20), two support top plates (21), and two vertical brackets (22), with two support top plates (21) spaced on left and right sides above the support base plate (20); two vertical brackets (22) are correspondingly arranged below the two support top plates (21), and the upper end of the vertical bracket (22) is fixedly connected to the lower end face of the support top plate (21), and the lower end of the vertical bracket (22) is fixedly connected to the upper end face of the support base plate (20); the middle part of the upper end of the support base plate (20) is fixedly connected with a limit block no.1 (23) between two vertical brackets (22), and the height of the limit block no.1 (23) is lower than the height of the vertical bracket (22).
3. The dynamic and static tensile testing device for anchor rods or anchor cabl&s/504694 according to claim 1 or 2, which is characterized in that bolt holes no.1 (24) matched with the rock mechanics testing machine or the drop hammer impact test platform is arranged on the surrounding of the support base plate (20); multiple bolt holes no.2 (25) are arranged on the support top plate (21); the fixed bearing platform (4) is provided with multiple bolt holes no.3 (32), and is fixedly connected to the support base (1) through a connecting bolt no.1 penetrating through the bolt holes no.3 (32) and no.2 (25).
4. The dynamic and static tensile testing device for anchor rods or anchor cables according to claim 3, characterized in that multiple bolts no.4 are arranged on the transverse loading platform (11); the transfer platform (15) is provided with multiple bolt holes no.5, which are fixedly connected to the transverse loading platform (11) through connecting bolts no.2 penetrating through bolt holes no.4 and no.5; the fixed platform (7) is provided with multiple bolt holes no.6, and is fixedly connected to the transverse loading platform (11) through connecting bolts no.3 penetrating through bolt holes no.4 and bolt holes no.6.
5. The dynamic and static tensile testing device for anchor rods or anchor cables according to claim 4, characterized in that the cross sections of the fixed guide rail (10) and the transverse chute (13) are both in a dovetail shape.
6. The dynamic and static tensile testing device for anchor rods or anchor cables according to claim 5, characterized in that in the same compression and tension transfer unit (12), the upper ends of a pair of guide inclined plates (14) are all planar structures; the upper left and right sides of the wedge-shaped loading block (3) are fixedly connected with a pair of limit blocks no.2 (26) respectively arranged in front and back intervals; a pair of limit blocks no.2 (26) on the same side are respectively matched with the upper limit of a pair of guide inclined plates (14) in the same compression and tension transfer unit (12).
7. The dynamic and static tensile testing device for anchor rods or anchor cabl&s/504694 according to claim 6, characterized in that the transfer platform (15) further comprises a transfer connecting plate (28) located at the bottom, a vertical plate (29) located on the outer side of the guide inclined plate (14), and a reinforced connecting plate (30) located on the outer side of the vertical plate (29); the transfer connecting plate (28) is fixedly connected to the transverse loading platform (11), and the lower end of the guide inclined plate (14) is fixedly connected to the inner end of the upper end face of the transfer connecting plate (28), the lower end of the vertical plate (29) is fixedly connected to the middle part of the upper end face of the transfer connecting plate (28), and the upper end is connected to the upper end of the guide inclined plate (14), which is a planar structure; one end of the reinforced connecting plate (30) is fixedly connected to the outer end of the upper end face of the transfer connecting plate (28), and the other end is fixedly connected to the outer side face of the vertical plate (29); in the same compression and tension transfer unit (12), a pair of limit card slots (27) are set at the opposite ends of two vertical plates (29) between a pair of transfer platforms (15); the inner end of the hexagonal steel pipe (5) is fixedly installed in a pair of limit slots (27), and is limited through a pair of limit slots (27).
8. A method for dynamic and static tensile testing for anchor rods or anchor cables, characterized in that it comprises the following steps: step 1: fixing the support base plate (20) on the rock mechanics pressure testing machine or drop hammer impact test platform through fastening bolts to fix the support base (1); then, fixing and connecting the two fixed bearing platforms (4) to the upper ends of the two support top plates (21) through connecting bolts no.1; then, the transverse loading platforms (11) in the two compression and tension transfer mechanisms (2) are slidably assembled on the two fixed bearing platforms (4), and the compression and tension transfer units (12) in the two compression and tension transfer mechanisms (2) are fixedly connected to the inner end of the transverse loading platform (11) through connecting bolts no.2, so that the inner end of the hexagonal steel pipe (5) is fixedly clamped in a pair of limit slots (27) between a pair of transfer platforms (15);
step 2: first, threading the anchor rod or anchor cable (6) to be tested through tH&J504694 transverse channels (17) in the two compression and tension transfer units (12) into the two hexagonal steel pipes (5), and sliding and adjusting the positions of the two fixed bearing platforms (4) to maintain the two fixed bearing platforms (4) in a state of contact, and ensuring that the two ends of the anchor rod or anchor cable (6) to be tested are exposed to the outer ends of the two hexagonal steel pipes (5); then using resin anchoring agent or cement-based anchoring agent to anchor the anchor rod or anchor cable (6) to the hexagonal steel pipe (5) in two compression and tension transfer mechanisms (2), as the anchoring test piece to be tested;
step 3: installing the transverse through-hole (18) of the fixed platform (7) in the compression and tension transfer mechanism (2) on the outside of the exposed end of the anchor rod or anchor cable (6), adjusting the position of the fixed platform (7) so that its inner end is connected to the outer end of the hexagonal steel pipe (5), and then connecting the fixed platform (7) to the transverse loading platform (11) through connecting bolt no.3 to coordinate with the compression and tension transfer unit (12) for axial positioning of the hexagonal steel pipe (5);
step 4: installing the pressure sensor (8) on the outside of the exposed end of the anchor rod or anchor cable (6) with a threaded section, and abutting it on one side of the outer end of the fixed platform (7); then connecting the fixed nut (9) to the outside of the exposed end of the anchor rod or anchor cable (6) through a threaded fit, and making the inner side of it abut on one side of the outer end of the pressure sensor (8); during this process, a fixed platform (7) on one side of the pressure sensor (8) is installed to simulate the fixed support plate;
step 5: tightening the fixed nut (9) using a torque wrench or tensioning instrument to apply a set pre tightening force to the anchor rod or anchor cable (6), simulating the actual working state of the anchor rod or anchor cable (6); assembling the wedge-shaped loading block (3) between the upper ends of two compression and tension transfer units (12), and making the loading ramps (16) on both sides fit with the opposite side of the guide inclined plate (14) in the two compression and tension transfer units (12);
step 6: starting the rock mechanics testing machine or the drop hammer impatt504694 testing machine to apply static and dynamic compression loads on the top of the wedge-shaped loading block (3); the wedge-shaped loading block (3) converts the static and dynamic compression loads P through the compression and tension transfer mechanism (2) into a pair of symmetrical tensile loads T acting on the inner ends of two hexagonal steel pipes (5), and by recording the vertical pressure and vertical displacement applied by the testing machine, and combining the pressure value of the pressure sensor (8), the stress-strain relationship of the anchor rod or anchor cable (6) during the drawing process can be obtained.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| LU504694A LU504694B1 (en) | 2023-07-07 | 2023-07-07 | Dynamic and static tensile testing device and method for anchor rods or anchor cables |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| LU504694A LU504694B1 (en) | 2023-07-07 | 2023-07-07 | Dynamic and static tensile testing device and method for anchor rods or anchor cables |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| LU504694B1 true LU504694B1 (en) | 2024-01-11 |
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ID=89473757
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| LU504694A LU504694B1 (en) | 2023-07-07 | 2023-07-07 | Dynamic and static tensile testing device and method for anchor rods or anchor cables |
Country Status (1)
| Country | Link |
|---|---|
| LU (1) | LU504694B1 (en) |
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2023
- 2023-07-07 LU LU504694A patent/LU504694B1/en active
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