Anchor bolt impact test device and test method

Abstract

The invention relates to the technical field of anchor bolt performance testing, in particular to an anchor bolt impact test device and a test method.The anchor bolt impact test method comprises the following steps that a concrete test block is hung on a support through a to-be-tested anchor bolt, and the support is driven by external force to rapidly ascend in an accelerated mode; the instantaneous acceleration of the upward impact is combined with the acceleration of the downward inertia force of the concrete test block, so that the test impact load for separating the concrete test block from the anchor bolt to be tested is loaded. The technical scheme is different from a common test method, the impact load is loaded by adopting a mode of generating acceleration through upward impact, and related test standards of the test are formulated, so that the performance of the anchor bolt under crack concrete base materials, large edge distance, large spacing and axial direct impact load can be efficiently and accurately researched, and the test efficiency is improved. The impact load does not need to be loaded by accurately aligning a drop hammer to the to-be-tested anchor bolt, so that loading is realized, the test operation difficulty is reduced, and the anchor bolt impact test can be efficiently and accurately carried out.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of anchor performance testing, in particular to an anchor impact test device and a test method. BACKGROUND

[0002] Mechanical anchor fixing is one of the most commonly used post-fixing methods in concrete structure engineering. The friction generated by the anchor expansion plate or the locking force generated by the anchor and the concrete block is used to fix the fixed object on the concrete block to achieve the fixing effect. Therefore, the reliability of anchoring is directly related to the safety of engineering operation. In some important projects, such as nuclear power plants and nuclear facilities, civil defense projects, if an accidental impact load acts on the anchor, it may cause displacement of important pipelines, equipment, and supports to be too large and fail, causing significant personnel casualties or economic losses, or causing major secondary accidents. Therefore, it is necessary to reduce the impact of such small probability events that may have serious consequences, and thus the reliability requirements for mechanical anchor anchoring are much higher than those of general construction projects.

[0003] The performance of mechanical anchors under static load and seismic load has been quite mature, such as the European ETA specification and the American ACI specification. However, there is no specification to guide the performance of mechanical anchors under impact load, and there is also little theoretical research and practical experience.

[0004] Moreover, the market uses a falling hammer to impact the anchor downward, which has a single test condition and is not conducive to studying the performance of the anchor under crack concrete base material, large edge distance, large spacing, and axial direct impact load. SUMMARY

[0005] The present application provides an anchor impact test device and a test method to improve the following technical problems: Most of the domestic and foreign anchors use a falling hammer to impact the anchor downward, and there is no precedent or related test standard for loading impact load by upward impact acceleration.

[0006] In a first aspect, the present application provides an anchor impact test method, which adopts the following technical solution: An anchor impact test method, comprising the following steps: suspending a concrete block on a support through an anchor to be tested, driving the support to rapidly accelerate upward by an external force, and combining the instantaneous acceleration of upward impact with the inertial force acceleration of the concrete block itself to achieve a test impact load for separating the concrete block and the anchor to be tested.

[0007] In an implementable technical solution of the present application, a single concrete test block is suspended and fixed by multiple anchor bolts to be tested, and the upper surface of the concrete test block is provided with multiple downwardly arranged drill holes, and a parallel crack penetrating all the drill holes is processed at the bottom of the concrete test block, and the width of the parallel crack is between 0.6-0.8 mm.

[0008] In an implementable technical solution of the present application, all the anchor bolts to be tested are subjected to twice loading of the same impact load, and no operation is performed on the anchor bolts to be tested between the twice impact loadings, and under the twice impact loadings, the displacement s1 and the displacement s2 of the concrete test block are measured by the displacement sensor; if the impact test evaluation of the anchor bolt to be tested meets the following standards, it is considered that the anchor bolt exhibits good impact bearing performance on the impact and severely cracked concrete base material: The 90% quantile of the displacement s1 under the first loading impact is not greater than 10 mm; The standard deviation of the displacement s1 under the first loading impact is not greater than 3 mm; The expected value of the displacement s1 under the first loading impact is greater than the expected value of the displacement s2 under the second loading impact.

[0009] In a second aspect, the present application provides an anchor bolt impact test device, which adopts the following technical solution: An anchor bolt impact test device based on the anchor bolt impact test method described above, the test device comprising a base, a fixed support, a lifting platform, a movable support, multiple guide rails, and multiple impact air cylinders, the bottom of the fixed support being fixedly installed on the base, the guide rails being vertically arranged and fixed between the top of the base and the fixed support, the lifting platform being horizontally arranged and slidingly penetrating through the guide rails, the movable support being installed on the lifting platform, the impact air cylinders being vertically arranged and fixed between the bottom of the base and the lifting platform, the top of the movable support being provided with an anchoring seat, a concrete test block being suspended and fixed to the bottom of the anchoring seat by multiple anchor bolts to be tested, the anchoring seat being further provided with a displacement sensor, multiple guide rails and multiple impact air cylinders being spaced apart and distributed on the periphery of the lifting platform, and multiple impact air cylinders being synchronously operated and used to provide the lifting platform with instantaneous acceleration in upward impact.

[0010] In an implementable technical solution of the present application, multiple pneumatic clamps are installed on the periphery of the lifting platform, the pneumatic clamps are arranged one-to-one corresponding to the guide rails, the guide rails slidingly penetrate through the pneumatic clamps, and multiple pneumatic clamps are synchronously operated to quickly brake the lifting platform in high-speed upward impact.

[0011] In an implementation of the present application, the periphery of the lifting platform is provided with a thickened structure, a cavity is arranged on the thickened structure, the pneumatic clamp is fixedly installed in the cavity, and the opening of the cavity is sealed by a cover plate.

[0012] In an implementation of the present application, the top of the fixed support is further provided with a plurality of elastic buffers, the elastic buffers are arranged in one-to-one correspondence with the guide rails, and the elastic buffers are used to flexibly contact the periphery of the lifting platform that is impacted upward at high speed.

[0013] In an implementation of the present application, the elastic buffer comprises a rubber block and a plurality of sets of buffer bolts, the top of the guide rail penetrates through the rubber block, and the rubber block is detachably assembled with the top of the fixed support by the plurality of sets of buffer bolts.

[0014] In an implementation of the present application, the movable support comprises a rectangular top frame and a plurality of vertical columns, at least four vertical columns are connected to the bottom of four corners of the rectangular top frame, and the rectangular top frame and the vertical columns are both made of I-beams.

[0015] In an implementation of the present application, the anchor seat comprises a horizontally arranged anchor plate and a plurality of vertically arranged suspension rods, the top of the suspension rod is fixedly connected to the top of the movable support by bolts, the bottom of the suspension rod is fixed to the anchor plate, a plurality of anchor bolt holes are arranged on the anchor plate, the anchor bolt to be tested is fixed and vertically penetrates through the anchor bolt hole, an installation hole is further arranged on the anchor plate, the displacement sensor is fixed in the installation hole, and the bottom detection surface of the displacement sensor is flush with the lower surface of the anchor plate.

[0016] In summary, the present application has at least one of the following beneficial technical effects: The present application uses the upward impact to generate acceleration to load the impact load, and the related test standards of the test are formulated, which is beneficial to efficiently and accurately study the performance of the anchor bolt under the conditions of the cracked concrete base material, large edge distance, large spacing and axial direct impact load, and further provides beneficial experience for the impact resistance performance research of the mechanical anchor bolt. Unlike the common test method, the impact load does not need to be loaded by precisely aiming the anchor bolt to be tested by a drop hammer, but only needs to be driven by an external force to quickly accelerate the support to rise upward, and the instantaneous acceleration of the upward impact combined with the inertial force acceleration of the concrete block itself downward, so as to load the test impact load for separating the concrete block and the anchor bolt to be tested, thereby reducing the test operation difficulty and being beneficial to efficiently and accurately performing the anchor bolt impact test. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments will be briefly introduced. Obviously, the drawings in the following description only constitute some embodiments of the present application. Other drawings can be obtained by those of ordinary skill in the art without any creative effort.

[0018] Figure 1 is a structural schematic diagram of an anchor impact test device according to an embodiment of the present application.

[0019] Figure 2 is a structural schematic diagram of a slitting mechanism according to an embodiment of the present application.

[0020] Figure 3 is a principle diagram of three common types of anchors according to an embodiment of the present application.

[0021] Explanation of reference signs: 100, base; 200, fixed support; 300, displacement sensor; 400, ball; 1, lifting platform; 11, concave cavity; 12, cover plate; 13, weight-reducing notch; 14, light shield; 2, movable support; 21, rectangular top frame; 22, stand column; 3, guide rail; 4, impact cylinder; 5, anchoring seat; 51, anchoring plate; 52, suspension rod; 6, pneumatic clamp; 7, elastic buffer part; 71, rubber block; 72, buffer bolt; 8, slitting mechanism; 81, linear slide module; 82, jacking cylinder; 83, mounting seat; 84, cutting disc; 85, driving motor; 9, photoelectric gate. DETAILED DESCRIPTION

[0022] In order to make the technical problems, technical solutions and beneficial effects of the present application more clearly understood, the present application will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and not to limit the present application.

[0023] It should be noted that when an element is referred to as being “fixed to” or “set on” another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being “connected to” another element, it can be directly connected to the other element or indirectly connected to the other element.

[0024] It should be understood that the terms "length", "width", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate directions or positions based on the directions or positions shown in the drawings and are used for convenience in describing the present application and simplifying the description, and thus cannot be construed as indicating or implying that a device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus cannot be understood as limiting the present application.

[0025] In addition, the terms "first", "second", "third", etc. are used only for descriptive purposes and should not be construed as indicating or implying relative importance or an indicated number of technical features. Therefore, the features defined as "first", "second", "third" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0026] The following will be described in detail in combination with the accompanying drawings. Figures 1-2 The present application will be further described in detail.

[0027] The embodiments of the present application disclose an anchor impact test method, comprising the following steps: suspending a concrete test block on a support through an anchor to be tested, driving the support to rapidly accelerate upward by an external force, combining the instantaneous acceleration of upward impact with the inertial force acceleration of the concrete test block itself to realize loading of a test impact load N test,shock .

[0028] Wherein a single concrete test block is suspended and fixed by a plurality of anchors to be tested, and the upper surface of the concrete test block is provided with a plurality of downward arranged drill holes, and a parallel crack penetrating all the drill holes is processed at the bottom of the concrete test block, and the width of the parallel crack is between 0.6-0.8mm.

[0029] And all the anchors to be tested are subjected to the same impact load N test,shock , and no operation is performed on the anchors to be tested between the two impact loadings, and the vertical displacement s1 and displacement s2 of the concrete test block are measured by a displacement sensor under the two impact loadings N test,shock ; if the impact test evaluation of the anchor to be tested meets the following standards, it is considered that the anchor to be tested performs well in impact and severe cracking of the concrete base material: The 90% quantile of the displacement s1 under the first loading impact is not greater than 10mm; The standard deviation of the displacement s1 under the first loading impact is not greater than 3mm; The expected value of the displacement s1 under the first loading impact is greater than the expected value of the displacement s2 under the second loading impact.

[0030] The anchor impact test method of the embodiments of the present application has the following beneficial technical effects: Since the common test method generally uses the falling hammer impact method to perform impact load test on the anchor, the falling hammer needs to accurately impact the anchor on the concrete test block. After the anchor is impacted, relative displacement occurs between the anchor and the concrete test block. Then, the performance of the anchor is indirectly evaluated by the size of the relative displacement. In the actual test process, the falling position and direction of the falling hammer need to be controlled to accurately impact the anchor downward. The test operation is difficult, which is not conducive to efficient and accurate anchor impact test.

[0031] The present application uses upward impact to generate acceleration for loading impact load, and formulates relevant test standards for the test, which is conducive to efficient and accurate research on the performance of the anchor under crack concrete base material, large edge distance, large spacing, and axial direct impact load. Furthermore, it provides beneficial experience for mechanical anchor impact resistance performance research. Different from the common test method, the test method of the present application does not need to accurately align the anchor to be tested by the falling hammer to load impact load. It only needs to drive the support to rapidly accelerate upward by external force. The instantaneous acceleration of upward impact combined with the inertial force acceleration of the concrete test block itself realizes the loading of the test impact load for separating the concrete test block and the anchor to be tested, which reduces the test operation difficulty and is conducive to efficient and accurate anchor impact test.

[0032] The embodiments of the present application also disclose an anchor impact test device. Referring to Figures 1-2 The anchor impact test device comprises a base 100, a fixed support 200, a lifting platform 1, a movable support 2, a plurality of guide rails 3, and a plurality of impact cylinders 4. The bottom of the fixed support 200 is fixedly installed on the base 100. The guide rails 3 are vertically arranged and fixed between the top of the base 100 and the fixed support 200. The lifting platform 1 is horizontally arranged and slidably penetrates through the guide rails 3. The movable support 2 is installed on the lifting platform 1. The impact cylinders 4 are vertically arranged and fixed between the bottom of the base 100 and the lifting platform 1. The top of the movable support 2 is provided with an anchoring seat 5. The concrete test block is suspended and fixed to the bottom of the anchoring seat 5 by a plurality of anchors to be tested. The anchoring seat 5 is further provided with a displacement sensor 300. The plurality of guide rails 3 and the plurality of impact cylinders 4 are spaced apart and arranged on the periphery of the lifting platform 1. The plurality of impact cylinders 4 work synchronously and provide the instantaneous acceleration of the upward impact of the lifting platform 1.

[0033] In order to facilitate detection and recordation of the instantaneous acceleration of the lifting platform 1, the instantaneous acceleration and the mass are used to indirectly calculate the impact load N test,shockThe inner side wall of the fixed support 200 is provided with a photoelectric gate 9, and the outer side of the lifting platform 1 is vertically provided with a horizontally arranged light barrier 14. The real-time instantaneous acceleration can be calculated by the ratio of the light blocking time and the width of the light barrier 14 when the light barrier 14 passes through the photoelectric gate 9. When the maximum instantaneous acceleration reaches the preset standard, the loading action of the impact cylinder 4 is stopped.

[0034] Since the upward impact force generated by the impact cylinder 4 is relatively large, in order to quickly brake and decelerate the lifting platform 1 after generating a large upward instantaneous acceleration, a plurality of pneumatic clamps 6 are arranged on the periphery of the lifting platform 1. The pneumatic clamps 6 are arranged in one-to-one correspondence with the guide rails 3, the guide rails 3 slide through the pneumatic clamps 6, and the plurality of pneumatic clamps 6 work synchronously to quickly brake the high-speed upward impact of the lifting platform 1.

[0035] The photoelectric gate 9, the displacement sensor 300, the pneumatic clamp 6, and the impact cylinder 4 in the embodiment are electrically connected and controlled by the electric control system of the device. The automatic control and management of the equipment are realized through the transmission of electric signals. Meanwhile, it is convenient to record and calculate the key parameters and indexes in the test process.

[0036] In order to facilitate the installation, disassembly and maintenance of the pneumatic clamp 6, the periphery of the lifting platform 1 is provided with a thickened structure. The thickened structure is provided with a recess 11, and the pneumatic clamp 6 is fixedly installed in the recess 11. The opening of the recess 11 is sealed by a cover plate 12. The cover plate 12 is arranged above the pneumatic clamp 6 and has a good protective effect on the pneumatic clamp 6 during the impact test. In order to further reduce the damage of the impact to the pneumatic clamp 6 and ensure the normal and stable work of the pneumatic clamp 6, the gas connection port of the pneumatic clamp 6 is arranged downward and protrudes from the lower surface of the lifting platform 1.

[0037] Since the upward impact force generated by the impact cylinder 4 is relatively large, in order to prevent the fixed support 200 from being damaged after generating a large upward instantaneous acceleration of the lifting platform 1, and to improve the stability of the equipment during the loading impact process, a plurality of elastic buffers 7 are arranged on the top of the fixed support 200. The elastic buffers 7 are arranged in one-to-one correspondence with the guide rails 3. The elastic buffers 7 are used for flexible contact with the periphery of the high-speed upward impact lifting platform 1. Specifically, the elastic buffer 7 includes a rubber block 71 and a plurality of buffer bolts 72. The top of the guide rail 3 penetrates through the rubber block 71, and the rubber block 71 is detachably assembled with the top of the fixed support 200 through the plurality of buffer bolts 72. The above-mentioned elastic buffer 7 has the advantages of simple structure, convenient installation, disassembly and replacement, good impact resistance effect, and good protection effect on the fixed support 200 and the lifting platform 1.

[0038] In the embodiment, in order to improve the installation firmness of the movable support 2, the movable support 2 comprises a rectangular top frame 21 and a plurality of columns 22, at least four columns 22 are vertically connected to the bottom of four corners of the rectangular top frame 21, the rectangular top frame 21 and the columns 22 are both made of I-beams, the inner side of the top of the fixed support 200 is embedded with a freely rotatable ball 400, the ball 400 abuts against the outer side wall of the column 22. The above structure design can not only make the movable support 2 run more stably in the high-speed impact lifting process, but also the increased ball 400 design can reduce the resistance of the movable support 2 in the lifting process, and has the characteristics of stability and smooth lifting.

[0039] In the embodiment, in order to facilitate the suspension installation and fixed connection of the concrete test block, the anchoring seat 5 comprises a horizontally arranged anchoring plate 51 and a plurality of vertically arranged suspension rods 52, the top of the suspension rod 52 is bolted with the top of the movable support 2, the bottom of the suspension rod 52 is fixed to the anchoring plate 51, a plurality of spaced anchoring holes are arranged on the anchoring plate 51, the measured anchor bolt is fixed and vertically penetrates in the anchoring hole, the anchoring plate 51 is also provided with a mounting hole, the displacement sensor 300 is fixed in the mounting hole, and the bottom detection surface of the displacement sensor 300 is flush with the lower surface of the anchoring plate 51. After the concrete test block is loaded with impact load, the concrete test block will produce a certain amount of displacement downward, but the anchoring plate 51 and the measured anchor bolt are in a fixed state, so the displacement sensor 300 can quickly detect the displacement value.

[0040] Since the lifting platform 1 needs to be driven to rise, in order to reduce the overall weight of the lifting platform 1, the middle part of the lifting platform 1 is also provided with a weight-reducing gap 13, which completely covers the downward projection area of the concrete test block.

[0041] When the reinforced concrete member occurs plastic deformation, cracks will be formed in the area under tensile stress (tensile zone). Due to stress concentration, the crack will preferentially pass through the drill hole of the measured anchor bolt, so the anchor bolt impact test is carried out on the concrete base material with cracks. For the anchor bolt impact test, it is necessary to process parallel cracks on the concrete test block, and the test conditions are uniform and do not depend on the anchoring depth of the anchor bolt.

[0042] The base 100 is also provided with a slitting mechanism 8 for processing parallel cracks at the bottom of the concrete test block. The concrete test block is provided with a drill hole adapted to fix the measured anchor bolt, and the width of the parallel cracks is between 0.6-0.8mm and penetrates the bottom of all drill holes. The design of the weight-reducing gap 13 not only has a certain weight-reducing effect, but also when parallel cracks need to be processed at the bottom of the concrete test block, part of the components of the slitting mechanism 8 can be lifted to contact the bottom of the concrete test block through the weight-reducing gap 13, that is, the weight-reducing gap 13 also has a certain effect of avoiding and leaving space for the processing of parallel cracks.

[0043] In the embodiment, the slitting mechanism 8 comprises a servo motor driven linear slide module 81, a jacking cylinder 82, a mounting seat 83, a cutting disc 84 and a driving motor 85. The jacking cylinder 82 is vertically arranged and the bottom is mounted on the sliding block of the linear slide module 81. The linear slide module 81 is arranged along the length direction of the parallel cracks. The mounting seat 83 is fixedly installed on the top of the telescopic rod of the jacking cylinder 82. The cutting disc 84 is rotatably assembled in the mounting seat 83 and is driven by the driving motor 85 to rotate at high speed. The cutting disc 84 is vertically arranged and the rotation axis is horizontally arranged. The driving motor 85 is fixedly installed on one side of the mounting seat 83.

[0044] Starting the jacking cylinder 82 can drive the mounting seat 83, the cutting disc 84 and the driving motor 85 to rise together until the cutting disc 84 and the driving motor 85 are above the lifting platform 1 and the cutting disc 84 is jacked to one side of the concrete test block. Then the driving motor 85 and the linear slide module 81 are started to drive the high-speed rotating cutting disc 84 to move linearly, thereby quickly processing the parallel cracks at the bottom of the concrete test block. The slitting mechanism 8 designed above has simple structure, stable operation and can be precisely controlled by the PLC control module to realize the purpose of automatically processing the parallel cracks with small width.

[0045] In order to conveniently adapt to concrete test blocks of various sizes and different depths of parallel cracks, the jacking cylinder 82 is an adjustable stroke cylinder. Through the accurate measurement and setting in the early stage, the cutting disc 84 can be just raised to the appropriate position after the jacking cylinder 82 is opened to the limit position, thereby the top of the parallel cracks can be subsequently opened to connect the bottom of all the drilled holes.

[0046] In order to conveniently connect the driving motor 85 with the driving shaft of the cutting disc 84 and save the complex structure such as a speed reducer, the driving motor 85 is a hydraulic motor.

[0047] The specific test method of the anchor impact test device is as follows: Step one: drilling and cleaning the drilled holes on the upper surface of the concrete test block, then pasting the concrete test block on the lower surface of the anchoring seat 5 and suspending and fixing by the multiple anchor bolts to be tested; Step two: processing the parallel cracks penetrating all the drilled holes at the bottom of the concrete test block, and the width of the parallel cracks is between 0.6-0.8mm; Step three: simultaneously starting the impact cylinder 4 and driving the lifting platform 1 to quickly rise to form the upward impact instantaneous acceleration, combining with the downward inertial force acceleration of the concrete test block itself to realize the loading test impact load N test,shock ; Step four: all the anchor bolts to be tested are subjected to the same impact load N test,shocktwo times, without any operation (such as re-tensioning, etc.) to the anchor bolt between the two impact loadings, the displacement s1 of the anchor bolt under the first impact loading and the displacement s2 of the anchor bolt under the second impact loading are measured test,shock Next, the displacement s1 and the displacement s2 of the concrete block are measured by the displacement sensor 300; Step five: if the impact test evaluation of the anchor bolt to be tested meets the following criteria, the anchor bolt is considered to have good impact bearing performance on the impact and severely cracked concrete base: The 90th percentile of the displacement s1 under the first impact loading is not greater than 10 mm; The standard deviation of the displacement s1 under the first impact loading is not greater than 3 mm; The expected value of the displacement s1 under the first impact loading is greater than the expected value of the displacement s2 under the second impact loading.

[0048] In any case, the minimum anchor size or hole diameter is critical for the impact test of the mechanical anchor. Therefore, in the actual test, a small size anchor is always used, and the impact bearing capacity design value R d,shock and the mass m (25 kg, 52 kg or 70 kg), wherein the size of the 25 kg concrete block is 290 x 290 x 120 mm, the size of the 52 kg concrete block is 360 x 360 x 160 mm, and the size of the 70 kg concrete block is 360 x 360 x 210 mm, the anchor impact test is performed to perform the anchor impact test, the maximum acceleration a test,shock As shown in the following table: Anchor bolt model BUC / BUC-T BLPE BTP / BTP-X Selected anchor bolt size M10 M8 M8 Impact load design value 20 kN 8.1 kN 3.1 kN Test block mass 70 kg 52 kg 25 kg Acceleration peak ≥29.2g ≥15.9g ≥12.7g Among them, the BUC / BUC-T type anchor is a self-expanding anchor, the BLPE type anchor is a sleeve type expanding anchor, and the BTP / BTP-X type anchor is a wedge-shaped expanding anchor. The working principle of the above three commonly used types of anchors is as shown in Figure 3 The N in the formula is the pulling force borne by the top end of the anchor, which is formed due to the impact loading. Figure 3

[0049] The beneficial technical effects of the anchor impact test device of the embodiments of the present application are as follows: For anchor impact testing, the lifting platform 1 generates a maximum acceleration a test,shock The impact waveform is roughly similar to a half-sine wave, and the pulse duration is 20-30 ms. Since the dynamic test load generated by the inertia of the concrete block also has a half-sine impact waveform, the rapid loading of a large test impact load on the concrete block can be formed by the downward inertia force of the concrete block and the upward impact force of the lifting platform 1.

[0050] ​Through the synchronous work of the multiple impact cylinders 4, the lifting platform 1 is driven to impact upward to generate instantaneous acceleration, and the guide rail 3 has good guiding and limiting effects on the lifting of the lifting platform 1, at this time, the concrete test block itself has downward inertia force acceleration, which is sufficient to rapidly load a larger test impact load on the concrete test block in a small space, and the whole device occupies a small space and runs stably.

[0051] The above only describes the preferred embodiments of the present application and is not used to limit the present application, and any modification, equivalent replacement and improvement made within the spirit and principle of the application should be included in the protection scope of the present application.

Claims

1. A method of anchor impact testing, characterized by, The method comprises the following steps: The concrete test block is hung on the support through the anchor bolt to be tested, the support is driven to rapidly accelerate upward by external force, and the instantaneous acceleration of upward impact combined with the inertial force acceleration of the concrete test block itself realizes the loading of the test impact load for separating the concrete test block and the anchor bolt to be tested.

2. The anchor impact test method according to claim 1, characterized in that, The single concrete test block is hung and fixed through multiple anchor bolts to be tested, and the upper surface of the concrete test block is provided with multiple downward arranged drill holes, and a parallel crack penetrating all the drill holes is processed at the bottom of the concrete test block, and the parallel crack width is between 0.6-0.8mm.

3. The anchor impact test method according to claim 1, wherein All the anchor bolts to be tested are subjected to twice loading of the same impact load, no operation is performed on the anchor bolts to be tested between the twice impact loadings, and the displacement s1 and the displacement s2 of the concrete test block are measured by the displacement sensor under the twice impact loadings; if the impact test evaluation of the anchor bolt to be tested meets the following standards, it is considered that the anchor bolt exhibits good impact bearing performance on the impact and severely cracked concrete base material: The 90% quantile of the displacement s1 under the first loading impact is not greater than 10mm; The standard deviation of the displacement s1 under the first loading impact is not greater than 3mm; The expected value of the displacement s1 under the first loading impact is greater than the expected value of the displacement s2 under the second loading impact.

4. An anchor impact testing device characterized by, The anchor bolt impact test method based on any one of claims 1-3, the anchor bolt impact test device comprises a base (100), a fixed support (200), a lifting platform (1), a movable support (2), multiple guide rails (3) and multiple impact air cylinders (4), the bottom of the fixed support (200) is fixedly installed on the base (100), the guide rails (3) are vertically arranged and fixed between the base (100) and the top of the fixed support (200), the lifting platform (1) is horizontally arranged and slid through by the guide rails (3), the movable support (2) is installed on the lifting platform (1), the impact air cylinders (4) are vertically arranged and fixed between the base (100) and the bottom of the lifting platform (1), the top of the movable support (2) is provided with an anchoring seat (5), the concrete test block is hung and fixed to the bottom of the anchoring seat (5) through multiple anchor bolts to be tested, the anchoring seat (5) is further provided with a displacement sensor (300), multiple guide rails (3) and multiple impact air cylinders (4) are distributed on the periphery of the lifting platform (1), multiple impact air cylinders (4) work synchronously and are used to provide the instantaneous acceleration of upward impact of the lifting platform (1).

5. The anchor impact testing device of claim 4, wherein, Multiple pneumatic clamps (6) are installed on the periphery of the lifting platform (1), the pneumatic clamps (6) are arranged one by one corresponding to the guide rails (3), the guide rails (3) slide through the pneumatic clamps (6), and multiple pneumatic clamps (6) work synchronously to rapidly brake the lifting platform (1) which impacts upward at high speed.

6. The anchor impact testing device of claim 5, wherein, The periphery of the lifting platform (1) is provided with a thickened structure, and a cavity (11) is arranged on the thickened structure, the pneumatic clamp (6) is fixedly installed in the cavity (11), and the opening of the cavity (11) is sealed by a cover plate (12).

7. The anchor impact testing device of claim 4, wherein, The top of the fixed support (200) is further provided with a plurality of elastic buffers (7), the elastic buffers (7) are arranged in one-to-one correspondence with the guide rails (3), and the elastic buffers (7) are used for flexibly contacting the periphery of the lifting platform (1) which is impacted upward at high speed.

8. The anchor impact testing device of claim 7, wherein, The elastic buffer (7) comprises a rubber block (71) and a plurality of groups of buffer bolts (72), the top of the guide rail (3) penetrates through the rubber block (71), and the rubber block (71) is detachably assembled with the top of the fixed support (200) through the plurality of groups of buffer bolts (72).

9. The anchor impact testing device of claim 4, wherein, The movable support (2) comprises a rectangular top frame (21) and a plurality of vertical columns (22), at least four vertical columns (22) are vertically connected to the bottom of four corners of the rectangular top frame (21), and the rectangular top frame (21) and the vertical columns (22) are both made of I-beams.

10. The anchor impact testing device of claim 4, wherein, The anchoring seat (5) comprises a horizontally arranged anchoring plate (51) and a plurality of vertically arranged suspension rods (52), the top of the suspension rod (52) is bolted to the top of the movable support (2), the bottom of the suspension rod (52) is fixed to the anchoring plate (51), a plurality of spaced anchoring holes are arranged on the anchoring plate (51), and the to-be-tested anchor is fixed and vertically penetrates through the anchoring holes, the anchoring plate (51) is further provided with a mounting hole, the displacement sensor (300) is fixed in the mounting hole, and the bottom detection surface of the displacement sensor (300) is flush with the lower surface of the anchoring plate (51).

Images