A device for detecting the anti-pulling performance of an anchoring steel bar

Abstract

The application provides an anchoring steel bar anti-pulling performance detection device, and relates to the technical field of steel bar detection. The anchoring steel bar anti-pulling performance detection device comprises a jack, a first anchorage device and a second anchorage device. The jack is internally provided with a movable piston. The first anchorage device comprises a first anchor ring and a plurality of first anchor pieces. The plurality of first anchor pieces can simultaneously move to the center line of the jack to form a first through hole. The second anchorage device comprises a second anchor ring and a plurality of second anchor pieces. The plurality of second anchor pieces can simultaneously move to the center line of the jack to form a second through hole. The center line of the first through hole, the center line of the second through hole and the center line of the jack are arranged in a collinear manner. During the movement of the piston in a direction away from the second anchorage device, the second through hole first clamps the anchoring steel bar, and then the first through hole clamps the anchoring steel bar. The anchoring steel bar anti-pulling performance detection device can ensure that the pulling force direction of the jack to the anchoring steel bar is consistent with the axial direction of the anchoring steel bar.

Description

Technical Field

[0001] This invention relates to the field of rebar testing technology, and in particular to a device for testing the pull-out performance of anchored rebar. Background Technology

[0002] After the reinforcing bars are inserted into the concrete structure, in order to ensure construction quality, it is necessary to sample and test the pull-out performance of the reinforcing bars to determine whether the connection strength between the reinforcing bars and the concrete structure has reached the expected level.

[0003] In related technologies, such as reference 202320331764.3, a tooling for testing the bending pull-out performance of embedded anchor bars is disclosed. When using this tooling, a jack is first placed on the embedded anchor bar, and then the anchor bar clamp is clamped to the end of the embedded anchor bar away from the concrete structure. Then the jack generates an upward pulling force on the embedded anchor bar, and finally the pull-out coefficient of the embedded anchor bar is obtained based on the pressure coefficient of the jack.

[0004] When using the aforementioned tooling for testing the bending pull-out performance of embedded anchor bars, the end of the embedded steel bar furthest from the concrete structure is prone to bending and shifting. When the anchor bar clamp is moved to center and clamp the end of the embedded anchor bar furthest from the concrete structure, it is easy to cause the axis of the embedded anchor bar to be non-collinear with the axis of the jack. This results in the direction of the pull-out force being inconsistent with the direction of the axis of the embedded anchor bar, affecting the accuracy of the test results.

[0005] The information disclosed in the background section of this invention is intended only to enhance the understanding of the general background of this invention, and should not be construed as an admission or in any way implying that such information constitutes prior art known to those skilled in the art. Summary of the Invention

[0006] Therefore, it is necessary to provide a pull-out performance testing device for anchored steel bars to address the problem that current steel bar pull-out performance testing devices produce inaccurate test results due to the inconsistency between the direction of the pull-out force and the axial direction of the steel bar.

[0007] The above objectives are achieved through the following technical solutions: A device for testing the pull-out resistance of anchored steel bars, comprising: A jack with a movable piston inside; A first anchor is provided at one end of the jack. The first anchor includes a first anchor ring and a plurality of first anchor plates. The first anchor ring is movably provided inside the jack and is engaged with the piston drive. The plurality of first anchor plates are movably provided inside the first anchor ring. The plurality of first anchor plates can move simultaneously toward the center line of the jack to form a first through hole for clamping and anchoring the reinforcing bar. The second anchor is located at the end of the jack away from the first anchor. The second anchor includes a second anchor ring and a plurality of second anchor plates. The second anchor ring is movably disposed inside the jack and is engaged with the piston drive. The plurality of second anchor plates are movably disposed inside the second anchor ring. The plurality of second anchor plates can move simultaneously toward the center line of the jack to form a second through hole for clamping and anchoring the reinforcing bar. The center lines of the first through hole, the second through hole, and the jack are collinear. During the process of the piston moving away from the second anchor, the second through hole first clamps the anchoring steel bar, and then the first through hole clamps the anchoring steel bar.

[0008] In one possible implementation, the end of the jack furthest from the second anchor is provided with an abutment ring, the first anchor ring being movably disposed within the abutment ring, and the first anchor further comprising: A first fixing ring is located on the side of the abutment ring away from the second anchor and is connected to the first anchor ring; The first movable ring is movably disposed between the first fixed ring and the abutment ring, and slides in cooperation with the first anchor ring; A first return spring is telescopically disposed between the first fixed ring and the first movable ring; Multiple first connecting blocks are movably mounted on the first movable ring and connected to the corresponding first anchor pieces.

[0009] In one possible implementation, the first movable ring has a first boss on the side away from the first anchor piece, and the first anchor also includes a first opening spring, one end of which is connected to the first boss and the other end of which is connected to the end of the first connecting block away from the first anchor piece.

[0010] In one possible implementation, the inner wall surface of the first anchor ring is an annular inclined surface, and the inner diameter of the first anchor ring gradually increases from the end of the first anchor ring closer to the second anchor to the end of the first anchor ring farther away from the second anchor. The shape of the outer wall surface of the first anchor plate is adapted to the shape of the inner wall surface of the first anchor ring.

[0011] In one possible implementation, the second anchorage further includes: The second fixing ring is located on the side of the second anchor ring close to the first anchor and is connected to the second anchor ring; The second movable ring is fixed inside the jack, located between the second fixed ring and the second anchor ring, and slides in cooperation with the second anchor ring. The second return spring is telescopically disposed between the second fixed ring and the second movable ring; Multiple second connecting blocks are movably mounted on the second movable ring and connected to the corresponding second anchor plates.

[0012] In one possible implementation, the second movable ring has a second boss on the side away from the second anchor piece, and the second anchor also includes a second opening spring, one end of which is connected to the second boss, and the other end of which is connected to the end of the second connecting block away from the second anchor piece.

[0013] In one possible implementation, the inner wall surface of the second anchor ring is an annular inclined surface, the inner diameter of the second anchor ring gradually decreases from the end of the second anchor ring closer to the first anchor to the end of the second anchor ring farther away from the first anchor, and the shape of the outer wall surface of the second anchor plate is adapted to the shape of the inner wall surface of the second anchor ring.

[0014] In one possible implementation, the jack has a movable push rod inside, one end of which is connected to both the piston and the first anchor ring, and the end of the push rod away from the first anchor ring is able to abut against the side of the second fixed ring away from the second movable ring.

[0015] In one possible implementation, the second anchorage further includes: The first rack is located on the side of the second fixed ring away from the second movable ring; The second rack is movably mounted on a fixed rod at the end of the top rod away from the first anchor. A gear is rotatably disposed between the first rack and the second rack, and the gear is capable of meshing with either the first rack or the second rack.

[0016] In one possible implementation, the end of the fixing rod away from the second fixing ring is connected to a fixing platform on the top rod. A pressure spring is sleeved on the fixing rod, one end of which is connected to the second rack, and the other end is connected to the end of the fixing rod that is connected to the fixing platform.

[0017] The beneficial effects of this invention are: The present invention provides a device for testing the pull-out performance of anchored reinforcing bars. This device is used to test the pull-out performance of anchored reinforcing bars with one end embedded in a concrete structure. When the piston moves away from the concrete structure, the second through hole first clamps the end of the anchored reinforcing bar closest to the concrete structure, and then the first through hole clamps the end of the anchored reinforcing bar furthest from the concrete structure. After both the first and second through holes clamp the anchored reinforcing bars, multiple second anchor plates release the anchored reinforcing bars. Because the centerline of the jack is collinear with the centerlines of the first and second through holes, the second through hole clamping the end of the anchored reinforcing bar closest to the concrete structure first creates a certain clamping force on the anchored reinforcing bar and centers it. The first through hole then clamps the end of the anchored reinforcing bar furthest from the concrete structure to correct any bending or offset at that end. This ensures that the axis of the anchored reinforcing bar is collinear with the axis of the jack, and consequently, that the axis of the anchored reinforcing bar is aligned with the direction of the pull-out force exerted by the jack, resulting in accurate pull-out performance testing results. Attached Figure Description

[0018] Figure 1 A schematic diagram of the structure of a device for testing the pull-out performance of anchored steel bars according to an embodiment of the present invention is shown; Figure 2 A partial structural schematic diagram of a device for testing the pull-out performance of anchored steel bars according to an embodiment of the present invention is shown. Figure 3 It shows Figure 2 Internal diagram of the structure; Figure 4 It shows Figure 3 Enlarged view of point A in the middle; Figure 5 It shows Figure 4 Enlarged view of point B in the middle; Figure 6 It shows Figure 3 Enlarged view of point C in the middle; Figure 7 It shows Figure 6 Enlarged diagram of point D in the middle.

[0019] in: 100. Oil pump; 200. Jack; 210. Shell; 211. First cylinder; 212. Second cylinder; 213. Oil chamber; 220. Abutment ring; 230. Piston; 240. Push rod; 241. Pressure block; 242. Fixing platform; 300, First anchor; 310, First anchor ring; 320, First anchor plate; 330, First movable ring; 331, First sliding groove; 340, First fixed ring; 350, First return spring; 360, First connecting block; 370, First opening spring; 400. Second anchor; 410. Second anchor ring; 420. Second anchor plate; 430. Second fixed ring; 440. Second movable ring; 441. Second slide groove; 442. Mounting protrusion; 450. Second return spring; 460. Gear; 470. First rack; 480. Second rack; 481. Fixed rod; 482. Compression spring; 490. Second connecting block; 491. Second opening spring; X, the first direction; Y, the second direction. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0021] The component designations used in this document, such as "first" and "second," are merely for distinguishing the described objects and do not have any sequential or technical meaning. The terms "connection" and "linkage" used in this invention, unless otherwise specified, include both direct and indirect connections (linkages). It should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are used only for the convenience of describing the invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the invention.

[0022] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0023] Please see Figures 1 to 7 One embodiment of the present invention provides a device for testing the pull-out performance of anchored steel bars. The device is used to test the pull-out performance of anchored steel bars with one end pre-embedded in a concrete structure.

[0024] Please see Figure 2 and Figure 3The direction of the pull-out force exerted on the anchored steel bar by the pull-out performance testing device is defined as the first direction X, and the direction opposite to the first direction X is defined as the second direction Y.

[0025] Please see Figures 1 to 7 The device for testing the pull-out performance of anchored steel bars includes a jack 200, a first anchor 300, and a second anchor 400.

[0026] The jack 200 has one end mounted on a concrete structure along the second direction Y, and the jack 200 has a movable piston 230 inside.

[0027] The first anchor 300 is located at the end of the jack 200 away from the concrete structure, that is, at the end of the jack 200 along the first direction X. The first anchor 300 includes a first anchor ring 310 and a plurality of first anchor plates 320. The first anchor ring 310 is movably located inside the jack 200 and is in transmission cooperation with the piston 230. The plurality of first anchor plates 320 are movably located inside the first anchor ring 310. The plurality of first anchor plates 320 can move simultaneously toward the centerline of the jack 200 to form a first through hole for clamping the anchoring steel bar. The first through hole can clamp the end of the anchoring steel bar away from the concrete structure, that is, the end of the anchoring steel bar along the first direction X.

[0028] The second anchor 400 is located at the end of the jack 200 near the concrete structure, i.e., the end of the jack 200 along the second direction Y. The second anchor 400 includes a second anchor ring 410 and a plurality of second anchor plates 420. The second anchor ring 410 is movably located inside the jack 200 and is in transmission cooperation with the piston 230. The plurality of second anchor plates 420 are movably located inside the second anchor ring 410. The plurality of second anchor plates 420 can move simultaneously toward the centerline of the jack 200 to form a second through hole for clamping the anchoring steel bar. The second through hole can clamp the end of the anchoring steel bar near the concrete structure, i.e., the end of the anchoring steel bar along the second direction Y. The plurality of second anchor plates 420 can move simultaneously away from the centerline of the jack 200 to form a fixed area. The fixed area can prevent the jack 200 from detaching from the anchoring steel bar.

[0029] Because the centerlines of the first through hole, the second through hole, and the jack 200 are collinear, when the piston 230 moves along the first direction X, the second through hole can first clamp one end of the anchoring steel bar along the second direction Y to create a certain clamping force on the anchoring steel bar and center the anchoring steel bar. Then the first through hole clamps one end of the anchoring steel bar along the first direction X to correct the bending offset of the end of the anchoring steel bar away from the concrete structure, thereby ensuring that the axis of the anchoring steel bar is collinear with the axis of the jack 200, and thus ensuring that the axis of the anchoring steel bar is consistent with the direction of the pull-out force of the jack 200 on the anchoring steel bar, so that the results of the pull-out performance test of the anchoring steel bar are accurate. After the first and second through holes clamp the anchoring steel bars, the multiple second anchor plates 420 can release the anchoring steel bars to prevent the clamping force of the second anchor plates 420 on the anchoring steel bars from affecting the test results. Furthermore, the multiple second anchor plates 420 can form a fixed area after moving away from the center line of the jack 200 to release the anchoring steel bars. When the anchoring steel bars break or are pulled out of the concrete structure, the fixed area can hold one end of the anchoring steel bars along the second direction Y to prevent the jack 200 from separating from the anchoring steel bars, thereby preventing the jack 200 from falling off the concrete structure.

[0030] It is worth noting that when the second anchor plate 420 loosens the anchoring steel bar, the distance between the second anchor plate 420 and the anchoring steel bar is small. This means that when the jack 200 is about to fall off, the fixed area formed between multiple second anchor plates 420 can hold one end of the anchoring steel bar along the second direction Y, especially when the anchoring steel bar pull-out performance testing device detects anchoring steel bars in a horizontal state.

[0031] Please see Figures 2 to 3 In some embodiments, the housing 210 of the jack 200 includes a first cylinder 211 and a second cylinder 212 coaxially arranged. The second cylinder 212 is located around the first cylinder 211. An oil cavity 213 is formed between the first cylinder 211 and the second cylinder 212. The piston 230 is movably disposed in the oil cavity 213. A movable push rod 240 is provided inside the first cylinder 211. The end of the push rod 240 away from the second anchor 400 is connected to both the piston 230 and the first anchor ring 310. A pressure block 241 is provided at the end of the push rod 240 away from the first anchor 300. When the push rod 240 moves along the second direction Y, the pressure block 241 can abut against and press the second anchor 400. The center line of the first through hole, the center line of the second through hole and the center line of the first cylinder 211 are collinear. The center line of the first cylinder 211 is the center line of the jack 200.

[0032] In some embodiments, the oil cavity 213 is an annular chamber, and one end of the oil cavity 213 along the second direction Y is closed, while the other end of the oil cavity 213 along the first direction X is open.

[0033] In some embodiments, one end of the push rod 240 along the first direction X is located between one end of the piston 230 along the first direction X and the first anchor ring 310. The push rod 240, the piston 230, and the first anchor ring 310 are fixedly connected by bolts so that when the piston 230 moves in the oil chamber 213 along the first direction X or the second direction Y, the piston 230 can drive the push rod 240 and the first anchor ring 310 to move synchronously.

[0034] Please see Figure 1 and Figure 3 In some embodiments, the device for testing the pull-out performance of anchored steel bars also includes an oil pump 100. The second housing 210 has a liquid inlet that communicates with the oil chamber 213. The oil filling pipe of the oil pump 100 can be connected to the liquid inlet, so that the oil pump 100 can inject or discharge hydraulic oil into the oil chamber 213.

[0035] When the oil pump 100 injects hydraulic oil into the oil chamber 213, the piston 230 can move in the first direction X within the oil chamber 213, thereby driving the push rod 240 and the first anchor ring 310 to move in the first direction X. When the oil pump 100 discharges the hydraulic oil from the oil chamber 213, the piston 230 can move in the second direction Y within the oil chamber 213, thereby driving the push rod 240 and the first anchor ring 310 to move in the second direction Y, thereby enabling the pressure block 241 to press the second anchor ring 410 to move in the second direction Y.

[0036] Please see Figures 3 to 5 In some embodiments, the second cylinder 212 has an abutment ring 220 at one end along the first direction X, and the first anchor ring 310 is movably disposed within the abutment ring 220. The first anchor 300 also includes a first fixed ring 340, a first movable ring 330, a first return spring 350, and a plurality of first connecting blocks 360. The first fixed ring 340 is disposed on the side of the abutment ring 220 away from the second anchor 400 and is connected to the first anchor ring 310. The first movable ring 330 is movably disposed between the first fixed ring 340 and the abutment ring 220 and slides with the first anchor ring 310. The first return spring 350 is retractably disposed within the first fixed ring 340. Between 0 and the first movable ring 330, the first movable ring 330 is provided with a plurality of first sliding grooves 331, the plurality of first sliding grooves 331 are arranged circumferentially around the first movable ring 330 at intervals, and the extension direction of the plurality of first sliding grooves 331 is towards the center line of the jack 200. A plurality of first connecting blocks 360 are movably disposed in the corresponding first sliding grooves 331 and connected to the corresponding first anchor plates 320. The end of the first connecting block 360 away from the first anchor plate 320 is disposed on the side of the first movable ring 330 away from the first anchor plate 320, and the width of the end of the first connecting block 360 away from the first anchor plate 320 is greater than the width of the first sliding groove 331.

[0037] Since the width of the end of the first connecting block 360 away from the first anchor piece 320 is greater than the width of the first groove 331, while the first connecting block 360 connects the first anchor piece 320, it can also ensure that when the first anchor ring 310 moves along the first direction X or the second direction Y, the first anchor piece 320 and the first anchor ring 310 can move relative to each other along the first direction X or the second direction Y.

[0038] Since the extension direction of the first chute 331 is all towards the center line of the jack 200, it ensures that when the multiple first connecting blocks 360 move within the corresponding first chute 331, they can simultaneously drive the multiple first anchor pieces 320 to move towards the center line of the first anchor ring 310, or simultaneously drive the multiple first anchor pieces 320 to move away from the center line of the first anchor ring 310. The center line of the first anchor ring 310 is collinear with the center line of the jack 200.

[0039] When the piston 230 is in the initial position (when no hydraulic oil is injected into the oil chamber 213), the first movable ring 330 abuts against the abutment ring 220 on one side along the first direction X, and the first fixed ring 340 abuts against the first movable ring 330 on one side along the first direction X. At this time, the relative positions of the multiple first anchor pieces 320 in the first anchor ring 310 make the multiple first anchor pieces 320 far apart from each other, thereby making the spatial distance between the multiple first anchor pieces 320 larger, which facilitates the anchoring steel bars to pass through the area between the multiple first anchor pieces 320.

[0040] When the piston 230 moves along the first direction X, the piston 230 can drive the first fixed ring 340 to move along the first direction X through the first anchor ring 310. The elastic force of the first return spring 350 can cause the first movable ring 330 to abut against the abutment ring 220, so that the first anchor piece 320 moves relative to the first anchor ring 310 along the second direction Y, thereby causing the multiple first connecting blocks 360 to drive the corresponding first anchor pieces 320 to move toward the center line of the jack 200, thereby forming a first through hole for clamping and anchoring the reinforcing bar between the multiple first anchor pieces 320.

[0041] After the anchoring rebar pull-out performance testing device completes the test on the anchoring rebar, during the process of the piston 230 moving to the initial position along the second direction Y, the piston 230 can drive the first fixed ring 340 to move along the second direction Y through the first anchor ring 310, so that the first fixed ring 340 overcomes the elastic force of the first return spring 350 and gradually moves towards the first movable ring 330 until it abuts against the first movable ring 330. During this process, the first anchor piece 320 moves relative to the first anchor piece 320 in the first anchor ring 310 along the first direction X, so that the multiple first connecting blocks 360 drive the corresponding first anchor piece 320 to move away from the center line of the jack 200, thereby moving the first anchor piece 320 away from the anchoring rebar.

[0042] Please see Figures 3 to 5 In some embodiments, the inner wall surface of the first anchor ring 310 is an annular inclined surface, and the inner diameter of the first anchor ring 310 gradually increases from the end of the first anchor ring 310 closer to the second anchor 400 towards the end of the first anchor ring 310 farther from the second anchor 400. The shape of the outer wall surface of the first anchor piece 320 is adapted to the shape of the inner wall surface of the first anchor ring 310. When the first anchor piece 320 moves within the first anchor ring 310 along the second direction Y, the spacing between the plurality of first anchor pieces 320 gradually decreases; when the first anchor piece 320 moves within the first anchor ring 310 along the first direction X, the spacing between the plurality of first anchor pieces 320 gradually increases.

[0043] Please see Figures 3 to 5 In some embodiments, the first movable ring 330 has a first boss on the side away from the first anchor piece 320, and the first anchor 300 also includes a first opening spring 370. One end of the first opening spring 370 is connected to the first boss, and the other end is connected to the end of the first connecting block 360 away from the first anchor piece 320. The elastic force of the first opening spring 370 can, through the first connecting block 360, cause the multiple first anchor pieces 320 to tend to move away from each other. When the first anchor piece 320 moves in the second direction Y within the first anchor ring 310, the squeezing force of the inner wall of the first anchor ring 310 on the first anchor piece 320 is greater than the elastic force of the first opening spring 370, so that the distance between the multiple first anchor pieces 320 can be reduced. When the first anchor piece 320 moves in the first direction X within the first anchor ring 310, the elastic force of the first opening spring 370 can cause the multiple first anchor pieces 320 to move away from each other. When the pull-out performance testing device for anchored steel bars is used to test anchored steel bars in a horizontal state, the first opening spring 370 can ensure that multiple first anchor plates 320 are not affected by gravity, so that multiple first anchor plates 320 can move closer to each other or further away from each other.

[0044] Please see Figure 3 , Figure 6 and Figure 7In some embodiments, the second anchor 400 further includes a second fixed ring 430, a second movable ring 440, a second return spring 450, and a plurality of second connecting blocks 490; the second fixed ring 430 is located on the side of the second anchor ring 410 away from the concrete structure and is connected to the second anchor ring 410; the second movable ring 440 is fixed inside the first cylinder 211, located between the second fixed ring 430 and the second anchor ring 410, and slides with the second anchor ring 410; the second movable ring 440 has a plurality of second sliding grooves 441, which surround the second movable ring 440. The circumferentially spaced second slide grooves 441 extend towards the center line of the jack 200; the second return spring 450 is telescopically disposed between the second fixed ring 430 and the second movable ring 440; the second connecting blocks 490 are movably disposed in the corresponding second slide grooves 441 and connected to the corresponding second anchor plates 420, the end of the second connecting block 490 away from the second anchor plate 420 is disposed on the side of the second movable ring 440 away from the second anchor plate 420, and the width of the end of the second connecting block 490 away from the second anchor plate 420 is greater than the width of the second slide groove 441.

[0045] Since the width of the end of the second connecting block 490 away from the second anchor piece 420 is greater than the width of the second groove 441, while the second connecting block 490 connects the second anchor piece 420, it can also ensure that when the second anchor ring 410 moves along the first direction X or the second direction Y, the second anchor piece 420 and the second anchor ring 410 can move relative to each other along the first direction X or the second direction Y.

[0046] Since the extension direction of the second chute 441 is all towards the center line of the jack 200, it ensures that when the multiple second connecting blocks 490 move within the corresponding second chute 441, they can simultaneously drive the multiple second anchor pieces 420 to move towards the center line of the second anchor ring 410, or simultaneously drive the multiple second anchor pieces 420 to move away from the center line of the second anchor ring 410. The center line of the second anchor ring 410 is collinear with the center line of the jack 200.

[0047] When the piston 230 is in the initial position, the pressure block 241 can press the second fixed ring 430, so that the second fixed ring 430 abuts against the second movable ring 440 on one side along the first direction X. At this time, the relative positions of the multiple second anchor pieces 420 in the second anchor ring 410 make the multiple second anchor pieces 420 far apart from each other, so that the spatial distance between the multiple second anchor pieces 420 is large, which makes it easier for the anchoring steel bars to pass through the area between the multiple second anchor pieces 420.

[0048] When piston 230 moves along the first direction X, it drives push rod 240 to move along the first direction X. The elastic force of second return spring 450 causes second fixed ring 430 to move along the first direction X, thereby causing second fixed ring 430 to drive second anchor ring 410 to move along the first direction X. Since second movable ring 440 is fixed inside first cylinder 211, second anchor piece 420 moves relative to second anchor ring 410 along the second direction Y. This causes multiple second connecting blocks 490 to drive corresponding second anchor pieces 420 to move toward the center line of jack 200, thereby forming a second through hole between multiple second anchor pieces 420 to clamp the anchoring steel bar. After the second through hole is formed between multiple second anchor pieces 420, piston 230 continues to move along the first direction X, and multiple second anchor pieces 420 can simultaneously move away from the center line of jack 200 to form a fixed area to prevent jack 200 from detaching from anchoring steel bar.

[0049] After the anchoring rebar pull-out performance testing device completes the test on the anchoring rebar, during the process of the piston 230 moving to the initial position along the second direction Y, the pressure block 241 can hold and press the second fixing ring 430 along the second direction Y, so that the second fixing ring 430 drives the second anchor ring 410 to move along the second direction Y, thereby causing the second anchor piece 420 to move relative to the second anchor ring 410 along the first direction X, and then causing multiple second connecting blocks 490 to drive the corresponding second anchor piece 420 to move away from the center line of the jack 200, and finally causing the second anchor piece 420 to move away from the anchoring rebar.

[0050] Please see Figure 3 , Figure 6 and Figure 7 In some embodiments, the inner wall surface of the second anchor ring 410 is an annular inclined surface, and the inner diameter of the second anchor ring 410 gradually decreases from the end of the second anchor ring 410 closer to the first anchor 300 towards the end of the second anchor ring 410 farther from the first anchor 300. The shape of the outer wall surface of the second anchor piece 420 is adapted to the shape of the inner wall surface of the second anchor ring 410. When the second anchor piece 420 moves within the second anchor ring 410 along the second direction Y, the spacing between the plurality of second anchor pieces 420 gradually decreases; when the second anchor piece 420 moves within the second anchor ring 410 along the first direction X, the spacing between the plurality of second anchor pieces 420 gradually increases.

[0051] Please see Figure 3 , Figure 6 and Figure 7In some embodiments, the second movable ring 440 has a second boss on the side away from the second anchor piece 420, and the second anchor 400 also includes a second opening spring 491. One end of the second opening spring 491 is connected to the second boss, and the other end is connected to the end of the second connecting block 490 away from the second anchor piece 420. The elastic force of the second opening spring 491 can, through the second connecting block 490, cause the multiple second anchor pieces 420 to tend to move away from each other. When the second anchor piece 420 moves in the second anchor ring 410 along the second direction Y, the squeezing force of the inner wall of the second anchor ring 410 on the second anchor piece 420 is greater than the elastic force of the second opening spring 491, so that the distance between the multiple second anchor pieces 420 can be reduced. When the second anchor piece 420 moves in the second anchor ring 410 along the first direction X, the elastic force of the second opening spring 491 can cause the multiple second anchor pieces 420 to move away from each other. When the pull-out performance testing device for anchored steel bars is used to test anchored steel bars in a horizontal state, the second opening spring 491 can ensure that multiple second anchor plates 420 are not affected by gravity and can move normally closer or further apart from each other.

[0052] It should be noted that the amount of movement of the multiple first anchor plates 320 towards the center line of the jack 200 when forming the first through hole is greater than the amount of movement of the multiple second anchor plates 420 towards the center line of the jack 200 when forming the second through hole, thus causing the second through hole to clamp the anchoring steel bar before the first through hole.

[0053] For example, the inclination of the inner wall surface of the first anchor ring 310 is greater than the inclination of the inner wall surface of the second anchor ring 410, so that the second through hole clamps the anchoring steel bar before the first through hole. The inclination of the inner wall surface of the first anchor ring 310 refers to the angle between the inner wall surface of the first anchor ring 310 and the plane containing the center line of the jack 200, and the inclination of the inner wall surface of the second anchor ring 410 refers to the angle between the inner wall surface of the second anchor ring 410 and the plane containing the center line of the jack 200.

[0054] Please see Figure 6 and Figure 7 In some embodiments, the second anchor 400 further includes a first rack 470, a second rack 480, and a gear 460; the first rack 470 is disposed on the side of the second fixed ring 430 away from the second movable ring 440; the second rack 480 is movably disposed on the fixed rod 481 at the end of the top rod 240 away from the first anchor 300; the gear 460 is rotatably disposed between the first rack 470 and the second rack 480, and the gear 460 can mesh with the first rack 470 or the second rack 480.

[0055] Furthermore, the end of the fixing rod 481 away from the second fixing ring 430 is connected to the fixing platform 242 on the top rod 240. A pressure spring 482 is sleeved on the fixing rod 481. One end of the pressure spring 482 is connected to the second rack 480, and the other end is connected to the end of the fixing rod 481 and the fixing platform 242.

[0056] Please see Figure 7 In some embodiments, the second movable ring 440 is provided with a mounting protrusion 442, and the gear 460 is rotatably disposed on the mounting protrusion 442.

[0057] When the piston 230 is in the initial position, the gear 460 is not engaged with the first rack 470 and the second rack 480.

[0058] Please see Figures 3 to 7 Since the gear 460 is mounted on the mounting protrusion 442 on the second movable ring 440, and the second movable ring 440 is fixed inside the first cylinder 211, the relative position of the gear 460 inside the first cylinder 211 remains unchanged. When the second fixed ring 430 moves inside the first cylinder 211 along the first direction X or the second direction Y, the position of the first rack 470 connected to the second fixed ring 430 inside the first cylinder 211 can change accordingly. When the push rod 240 moves inside the first cylinder 211 along the first direction X or the second direction Y, the position of the second rack 480 connected to the push rod 240 inside the first cylinder 211 can change accordingly.

[0059] When piston 230 drives push rod 240 to move along the first direction X, the elastic force of second return spring 450 can cause second fixed ring 430 to move along the first direction X, so that gear 460 meshes with first rack 470. Piston 230 continues to drive push rod 240 to move along the first direction X, so that second through hole clamps one end of anchor bar along second direction Y. At this time, first through hole has not yet been formed between multiple first anchor pieces 320. Piston 230 continues to drive push rod 240 to move along the first direction X, so that first through hole clamps one end of anchor bar along first direction X again (the amount of movement of multiple first anchor pieces 320 towards the center line of jack 200 when forming first through hole is greater than the amount of movement of multiple second anchor pieces 420 towards the center line of jack 200 when forming second through hole). When first through hole clamps anchor bar, gear 460 meshes with second rack 480.

[0060] When the second through hole clamps the anchoring steel bar, the second anchor plate 420 cannot continue to move relative to the second anchor ring 410 in the second direction Y, so that the second fixed ring 430 cannot continue to move in the first direction X, thereby preventing the first rack 470 from continuing to move in the first direction X, while the second rack 480 can still follow the push rod 240 to move in the first direction X. At this time, the movement of the second rack 480 in the first direction X can cause the gear 460 to rotate, thereby causing the first rack 470 to move in the second direction Y. Since the first rack 470 has fewer teeth meshing with the gear 460, the first rack 470 will disengage from the gear 460 after moving a certain distance in the second direction Y. After the gear 460 disengages from the first rack 470, the first rack 470 will no longer continue to move in the second direction Y.

[0061] During the process of the first rack 470 moving along the second direction Y until it disengages from the gear 460, the movement of the first rack 470 along the second direction Y compresses the second return spring 450, thereby causing the second fixing ring 430 to move along the second direction Y. This, in turn, causes the second anchor piece 420 to move relative to each other within the second anchor ring 410 along the first direction X. Ultimately, this causes the multiple second anchor pieces 420 to move away from each other within the second anchor ring 410, thus disengaging the second anchor pieces 420 from the anchoring steel bars. After the multiple second anchor pieces 420 move away from each other, they form a fixed area. This fixed area can hold the anchoring steel bars in place when they break or are pulled out of the concrete component.

[0062] When the test is completed, as the piston 230 moves along the second direction Y, the first fixed ring 340 can move along the second direction Y and abut against the first movable ring 330. During this process, the first anchor plate 320 moves relative to the first anchor ring 310 along the first direction X, thereby moving the first anchor plate 320 away from the center line of the jack 200, and thus moving the first anchor plate 320 away from the anchoring steel bar. When the piston 230 moves along the second direction Y, the push rod 240 can drive the second rack 480 to move along the second direction Y. When the second rack 480 moves along the second direction Y, it can drive the first rack 470 to move along the first direction X through the meshing of the gear 460 and the first rack 470, thereby forming a second through hole for the second anchor plate 420 to clamp the anchoring steel bar, thereby preventing the jack 200 from falling off. When the second through hole clamps the anchoring steel bar, the first rack 470 cannot continue to move along the first direction X. When the push rod 240 moves along the second direction Y, the second rack 480 cannot move relative to the gear 460. At this time, the second rack 480 will compress the pressure spring 482. When the push rod 240 continues to move along the second direction Y, the pressure block 241 abuts against the second fixed ring 430 and drives the second fixed ring 430 to move along the second direction Y. At this time, the first rack 470 will move synchronously along the second direction Y, thereby causing the gear 460 to rotate, which in turn causes the pressure spring 482 to compress faster. When the first rack 470 moves along the second direction Y and disengages from the gear 460, the elastic force of the pressure spring 482 is released, causing the second rack 480 to return to the initial position. The push rod 240 continues to move along the second direction Y until it returns to the initial position.

[0063] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0064] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the appended claims.

Claims

1. A device for testing the pull-out performance of anchored steel bars, characterized in that, include: A jack with a movable piston inside; A first anchor is provided at one end of the jack. The first anchor includes a first anchor ring and a plurality of first anchor plates. The first anchor ring is movably provided inside the jack and is engaged with the piston drive. The plurality of first anchor plates are movably provided inside the first anchor ring. The plurality of first anchor plates can move simultaneously toward the center line of the jack to form a first through hole for clamping and anchoring the reinforcing bar. The second anchor is located at the end of the jack away from the first anchor. The second anchor includes a second anchor ring and a plurality of second anchor plates. The second anchor ring is movably disposed inside the jack and is engaged with the piston drive. The plurality of second anchor plates are movably disposed inside the second anchor ring. The plurality of second anchor plates can move simultaneously toward the center line of the jack to form a second through hole for clamping and anchoring the reinforcing bar. The center lines of the first through hole, the second through hole, and the jack are collinear. During the process of the piston moving away from the second anchor, the second through hole first clamps the anchoring steel bar, and then the first through hole clamps the anchoring steel bar.

2. The device for testing the pull-out performance of anchored steel bars according to claim 1, characterized in that, The jack has an abutment ring at its end away from the second anchor, and the first anchor ring is movably disposed within the abutment ring. The first anchor also includes: A first fixing ring is located on the side of the abutment ring away from the second anchor and is connected to the first anchor ring; The first movable ring is movably disposed between the first fixed ring and the abutment ring, and slides in cooperation with the first anchor ring; A first return spring is telescopically disposed between the first fixed ring and the first movable ring; Multiple first connecting blocks are movably mounted on the first movable ring and connected to the corresponding first anchor pieces.

3. The device for testing the pull-out performance of anchored steel bars according to claim 2, characterized in that, The first movable ring has a first boss on the side away from the first anchor piece. The first anchor also includes a first opening spring, one end of which is connected to the first boss and the other end of which is connected to the end of the first connecting block away from the first anchor piece.

4. The device for testing the pull-out performance of anchored steel bars according to claim 2, characterized in that, The inner wall of the first anchor ring is an annular inclined surface. The inner diameter of the first anchor ring gradually increases from the end of the first anchor ring closer to the second anchor to the end of the first anchor ring farther away from the second anchor. The shape of the outer wall of the first anchor plate is adapted to the shape of the inner wall of the first anchor ring.

5. The device for testing the pull-out performance of anchored steel bars according to any one of claims 1-4, characterized in that, The second anchor also includes: The second fixing ring is located on the side of the second anchor ring close to the first anchor and is connected to the second anchor ring; The second movable ring is fixed inside the jack, located between the second fixed ring and the second anchor ring, and slides in cooperation with the second anchor ring. The second return spring is telescopically disposed between the second fixed ring and the second movable ring; Multiple second connecting blocks are movably mounted on the second movable ring and connected to the corresponding second anchor plates.

6. The device for testing the pull-out performance of anchored steel bars according to claim 5, characterized in that, The second movable ring has a second boss on the side away from the second anchor piece. The second anchor also includes a second opening spring. One end of the second opening spring is connected to the second boss, and the other end is connected to the end of the second connecting block away from the second anchor piece.

7. The device for testing the pull-out performance of anchored steel bars according to claim 5, characterized in that, The inner wall of the second anchor ring is an annular inclined surface. The inner diameter of the second anchor ring gradually decreases from the end of the second anchor ring closer to the first anchor to the end of the second anchor ring farther away from the first anchor. The shape of the outer wall of the second anchor plate is adapted to the shape of the inner wall of the second anchor ring.

8. The device for testing the pull-out performance of anchored steel bars according to claim 5, characterized in that, The jack is equipped with a movable push rod. One end of the push rod is connected to both the piston and the first anchor ring. The end of the push rod away from the first anchor ring can abut against the side of the second fixed ring away from the second movable ring.

9. The device for testing the pull-out performance of anchored steel bars according to claim 8, characterized in that, The second anchor also includes: The first rack is located on the side of the second fixed ring away from the second movable ring; The second rack is movably mounted on a fixed rod at the end of the top rod away from the first anchor. A gear is rotatably disposed between the first rack and the second rack, and the gear is capable of meshing with either the first rack or the second rack.

10. The device for testing the pull-out performance of anchored steel bars according to claim 9, characterized in that, The end of the fixing rod away from the second fixing ring is connected to the fixing platform on the top rod. A pressure spring is sleeved on the fixing rod. One end of the pressure spring is connected to the second rack, and the other end is connected to the end of the fixing rod and the fixing platform.

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