An adjustable rebar pull-out testing device

Abstract

This utility model relates to an adjustable rebar pull-out testing device, including a testing mechanism and a manual pump connected to the testing mechanism. The testing mechanism includes a base, a support platform mounted on the base, a lifting component detachably mounted on the support platform, and anchoring components. A first universal joint is provided between the support platform and the base. An adjusting screw is provided on the base, and the end of the adjusting screw is connected to the support platform. Rotating the adjusting screw allows the support platform to rotate around the first universal joint, thereby adjusting the angle of the support platform relative to the base. The adjustable rebar pull-out testing device designed in this utility model is suitable for multi-angle rebar testing needs in complex construction environments, significantly improving the flexibility and adaptability of traditional testing equipment.

Description

Technical Field

[0001] This utility model relates to the field of rebar pull-out testing technology, and in particular to an adjustable rebar pull-out testing device. Background Technology

[0002] Rebar anchoring technology, as an efficient and reliable method of rebar connection, is widely used in the reinforcement, expansion, and new construction of existing structures. To ensure that the quality of the anchoring meets design requirements, on-site testing of the anchoring performance is essential. Pull-out testing is a commonly used method to evaluate the anchoring strength and bond performance of the anchored rebar. Traditional anchoring pull-out testing devices are typically fixed in structure, making it difficult to adapt to the testing needs of anchoring at different angles and locations, thus limiting their flexibility and applicability in on-site construction. Utility Model Content

[0003] To address the aforementioned problems, the purpose of this utility model is to design an adjustable rebar pull-out testing device, suitable for multi-angle rebar testing needs in complex construction environments, significantly improving the flexibility and adaptability of traditional testing equipment.

[0004] The objective of this utility model is achieved through the following technical solution: An adjustable rebar pull-out testing device is designed, comprising a testing mechanism and a manual pump connected to the testing mechanism. The testing mechanism includes a base, a support platform mounted on the base, a lifting component detachably mounted on the support platform, and an anchor. A first universal joint is provided between the support platform and the base. An adjusting screw is provided on the base, and the end of the adjusting screw is connected to the support platform. Rotating the adjusting screw allows the support platform to rotate around the first universal joint to adjust the angle of the support platform relative to the base.

[0005] This design employs a combination of a first universal hinge and an adjusting screw, allowing the support platform to be adjusted at multiple angles on the base. This enables the testing mechanism to adapt to rebar installation testing requirements at different angles and positions, ensuring that the test axis is aligned with the rebar centerline. This is particularly suitable for rebar pull-out testing on irregular or inclined surfaces, significantly expanding the equipment's applicability. The lifting component is detachably mounted on the support platform, and the anchoring components can be replaced according to testing needs, achieving modular and standardized management of the equipment. The connection between the manual pump and the lifting component enables non-powered hydraulic loading of the rebar installation. This is simple to operate, precise to control, and ensures uniform loading and stable output, effectively reducing errors caused by unstable loading during testing. The manual pump requires no external power supply, facilitating use on construction sites, at heights, or in environments without power.

[0006] Furthermore, two adjusting screws are provided, and the two adjusting screws and the first universal joint are distributed in a triangle.

[0007] In this design, the two adjusting screws and the first universal joint form a triangular rigid support structure, which can evenly distribute the eccentric load during the test, preventing the support platform from shifting or overturning due to uneven force, and significantly improving the stability of the device on the inclined plane. The two adjusting screws control the rotation of the support platform in different directions, and together with the universal joint's omnidirectional rotation function, continuous angle adjustment of the support platform in multiple dimensions, including horizontal and inclined directions, can be achieved. By independently adjusting the extension and retraction of the two adjusting screws, the tilt angle of the support platform can be precisely controlled to meet the testing requirements for rebar installation at different angles.

[0008] Furthermore, the first universal joint includes a first ball head, a first ball cup, and a locking member. The first ball head is inserted into the first ball cup and is rotatably connected to the first ball cup. The locking member is used to lock the first ball cup to restrict its rotation. One of the first ball head and the first ball cup is fixed to the base, and the other is fixed to the support platform.

[0009] In this design, the first ball head and the first ball cup form the core of the omnidirectional rotation. One is fixed to the base, and the other is fixed to the support platform. Multi-angle free rotation is achieved through spherical contact. After angle adjustment, a locking mechanism mechanically locks the first ball head and the first ball cup, restricting their relative rotation and ensuring the support platform stably maintains the set angle. The design allows the support platform to tilt ±30° around the ball's center, covering most rebar installation testing scenarios.

[0010] Furthermore, the first ball head includes a first ball head and a first ball rod connected to the first ball head. The end of the first ball rod away from the first ball head is fixed on the base. The first ball cup includes a first ball recess and a first ball seat connected to the first ball recess. The first ball seat is fixed on the support platform. The first ball recess is provided with a first groove that fits against the first ball head. The first ball head is embedded in the first groove and can slide freely.

[0011] In this design, the first spherical recess is equipped with a first groove that fits snugly against the head of the first spherical ball. Precise surface fitting ensures uniform sliding resistance of the spherical head within the bowl, reducing jamming and enabling smooth adjustment of the support platform at multiple angles. In rebar pull-out tests, it can accurately match rebar directions at different angles, improving the accuracy of the test data.

[0012] Furthermore, the locking member includes a locking ring sleeved on the outer peripheral surface of the first ball recess and a threaded locking member disposed on the locking ring, the end of the threaded locking member being able to pass through the locking ring and abut against the head of the first ball.

[0013] In this design, a locking ring is fitted onto the outer circumference of the first ball's recess. A threaded locking element, such as a bolt, is arranged radially along the locking ring, with its end directly passing through the locking ring and abutting against the head of the first ball. By rotating the threaded locking element, the "tightening and locking" or "loosening and unlocking" states can be quickly switched. The threaded locking element provides progressive clamping force through threaded transmission, and the operator can flexibly adjust the locking force according to the test scenario.

[0014] Furthermore, the end of the adjusting screw is connected to the support platform via a second universal joint.

[0015] In this design, the second universal joint allows for multi-angle relative rotation between the end of the adjusting screw and the support platform, preventing additional axial torque or bending stress from the adjusting screw when the support platform is tilted. When the support platform rotates around the first universal joint to a tilted state, the second universal joint can adaptively adjust the spatial angle of the screw, ensuring that the screw always drives the support platform with axial force, rather than generating lateral force or jamming.

[0016] Furthermore, an annular fixing plate is sleeved on the outer periphery of one end of the lifting member, and the support platform is provided with a clamping unit for pressing and fixing the annular fixing plate.

[0017] In this design, an annular fixing plate is fitted around the outer circumference of the lifting component, forming full circumferential contact with the support platform. The support platform applies axial pressure to the annular fixing plate through a clamping unit, which can quickly complete the positioning and locking of the lifting component before testing, avoiding displacement of the lifting component due to vibration or load changes during pull-out testing, and ensuring the accuracy of test data.

[0018] Furthermore, the pressing unit includes a rotating shaft fixed to the support platform, a pressure plate rotatably mounted on the rotating shaft, and an elastic washer sleeved on the rotating shaft. The end of the rotating shaft is provided with a step, and the elastic washer is located between the step and the pressure plate. Rotating the pressure plate can cause the surface of the pressure plate to press against the annular fixing plate.

[0019] In this design, the pressure plate can rotate freely via a pivot, automatically adjusting the clamping direction according to the surface angle of the annular fixed plate to ensure a tight fit between the contact surfaces. An elastic gasket is fitted between the pivot step and the pressure plate, utilizing the material's elasticity to provide continuous pre-tightening force, compensating for assembly gaps and vibration displacement, and improving clamping stability.

[0020] Furthermore, the pressure plate has a first insertion hole, the annular fixing plate has a second insertion hole that matches the first insertion hole, and the clamping unit also includes a pin that can be inserted into the first insertion hole and the second insertion hole.

[0021] In this solution, a mating system consisting of a first insertion hole on the pressure plate, a second insertion hole on the annular fixing plate, and a pin achieves rapid positioning and rigid locking. After the pin passes through the aligned first and second insertion holes, the rigid contact of the metal material restricts the lateral and rotational degrees of freedom between the pressure plate and the annular fixing plate, forming a hole-shaft mating locking effect. The matching design of the insertion holes allows the pin to be quickly inserted without precise alignment, reducing the skill requirements for operators.

[0022] Compared with the prior art, the beneficial effects of this utility model are: This design employs a combination of a first universal hinge and an adjusting screw, allowing the support platform to be adjusted at multiple angles on the base. This enables the testing mechanism to adapt to rebar installation testing requirements at different angles and positions, ensuring that the test axis is aligned with the rebar centerline. This is particularly suitable for rebar pull-out testing on irregular or inclined surfaces, significantly expanding the equipment's applicability. The lifting component is detachably mounted on the support platform, and the anchoring components can be replaced according to testing needs, achieving modular and standardized management of the equipment. The connection between the manual pump and the lifting component enables non-powered hydraulic loading of the rebar installation. This is simple to operate, precise to control, and ensures uniform loading and stable output, effectively reducing errors caused by unstable loading during testing. The manual pump requires no external power supply, facilitating use on construction sites, at heights, or in environments without power. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of a detection mechanism according to an embodiment of the present invention. Figure 1 .

[0024] Figure 2 This is a schematic diagram of the structure of a detection mechanism according to an embodiment of the present invention. Figure 2 .

[0025] Figure 3 This is a partial cross-sectional view of the detection mechanism according to an embodiment of the present invention.

[0026] Figure 4 This is a schematic diagram showing the positional relationship between the first universal joint and the adjusting screw in an embodiment of this utility model.

[0027] Figure 5 This is a cross-sectional view of the first universal joint component according to an embodiment of the present utility model.

[0028] Figure 6 for Figure 3 A magnified view of part A in the image.

[0029] Illustrations: 1. Detection mechanism; 11. Base; 12. Support platform; 121. Clamping unit; 1211. Rotating shaft; 1212. Pressure plate; 1213. Elastic washer; 1214. Pin; 12111. Step; 12121. First insertion hole; 13. Lifting component; 131. Annular fixing plate; 1311. Second insertion hole; 14. Anchor; 15. First universal hinge; 151. First ball head; 152. First ball cup; 153. Locking component; 1511. First ball head; 1512. First ball rod; 1521. First ball recess; 1522. First ball seat; 15211. First groove; 1531. Locking ring; 1532. Limiting bottom ring; 1533. Threaded locking component; 16. Adjusting screw; 161. Second universal hinge. Detailed Implementation

[0030] To facilitate understanding of this invention, a more comprehensive description will be provided below with reference to the accompanying drawings. The drawings illustrate preferred embodiments of the invention. However, this invention can be implemented in many different forms and is not limited to the embodiments described herein.

[0031] like Figures 1 to 3 As shown, this embodiment provides an adjustable rebar pull-out testing device, including a testing mechanism 1 and a manual pump connected to the testing mechanism 1. The testing mechanism 1 includes a base 11, a support platform 12 disposed on the base 11, a lifting member 13 detachably disposed on the support platform 12, and an anchor 14. A first universal joint 15 is provided between the support platform 12 and the base 11. An adjusting screw 16 is provided on the base 11. The end of the adjusting screw 16 is connected to the support platform 12. Rotating the adjusting screw 16 can cause the support platform 12 to rotate around the first universal joint 15 to adjust the angle of the support platform 12 relative to the base 11.

[0032] It should be noted that in this embodiment, the testing mechanism 1 is the core functional module of the entire device, responsible for performing actual pull-out tests on the rebar. The base 11 is the basic support structure of the entire device, used to stably install and support other components. The support platform 12 is set on the base 11 and is used to support the testing components such as the lifting component 13 and the anchor 14. Its angle is adjustable to adapt to testing requirements at different angles or positions. The base 11 and the support platform 12 have aligned holes for the rebar to pass through. The lifting component 13 uses a hydraulic cylinder to apply an upward pulling force to the rebar. The anchor 14 is used to fix the upper end of the tested rebar, ensuring that the pulling force is accurately applied to the rebar and preventing displacement or slippage during the test. A manual pump is connected to the lifting component 13 to provide stable and controllable hydraulic pressure, allowing the lifting component 13 to gradually apply the pulling force. The manual pump and the anchor 14 can be based on existing technologies.

[0033] like Figure 4As shown, two adjusting screws 16 are provided, and the two adjusting screws 16 and the first universal joint 15 are triangularly distributed. The two adjusting screws 16 and the first universal joint 15 form a triangular rigid support structure, which can evenly distribute the eccentric load during the test, prevent the support platform 12 from shifting or overturning due to uneven force, and significantly improve the stability of the device on the inclined plane. The two adjusting screws 16 control the rotation of the support platform 12 in different directions, and together with the universal rotation function of the first universal joint 15, continuous angle adjustment of the support platform 12 in multiple dimensions such as horizontal and inclined can be realized. By independently adjusting the extension and retraction of the two adjusting screws 16, the tilt angle of the support platform 12 can be precisely controlled to meet the testing requirements of rebar installation at different angles.

[0034] like Figure 5 As shown, the first universal joint 15 includes a first ball head 151, a first ball cup 152, and a locking member 153. The first ball head 151 is inserted into the first ball cup 152 and rotatably connected to it. The locking member 153 is used to lock the first ball cup 152 to restrict its rotation. One of the first ball head 151 and the first ball cup 152 is fixed to the base 11, and the other is fixed to the support platform 12. Specifically, the first ball head 151 includes a first ball head 1511 and a first ball rod 1512 connected to the first ball head 1511. The end of the first ball rod 1512 away from the first ball head 1511 is fixed to the base 11. The end of the first ball rod 1512 is threaded, and a matching threaded hole can be provided on the base 11. The first ball rod 1512 is directly screwed into the threaded hole. Alternatively, a through hole can be provided on the base 11, and nuts matching the threads of the end of the first ball cue 1512 can be provided on both sides of the through hole. The first ball cue 1512 can be fixed to the base 11 using two nuts. The first ball cup 152 includes a first ball recess 1521 and a first ball seat 1522 connected to the first ball recess 1521. The first ball seat 1522 is fixed to the support platform 12 by bolts. The first ball recess 1521 is provided with a first groove 15211 that fits against the first ball head 1511. The first ball head 1511 is embedded in the first groove 15211 and can slide freely.

[0035] The locking member 153 includes a locking ring 1531 sleeved on the outer peripheral surface of the first ball recess 1521, and a threaded locking member 1533 disposed on the locking ring 1531. The end of the threaded locking member 1533 can pass through the locking ring 1531 and abut against the first ball head 1511. The locking member 153 also includes a limiting bottom ring 1532 connected to the locking ring 1531. The inner peripheral surface of the limiting bottom ring 1532 is a ball-ring surface adapted to the first ball head 1511. This facilitates the assembly, disassembly, and maintenance of the first universal joint 15. Since the inner wall of the first groove 15211 is a hemispherical surface or a spherical surface smaller than a hemisphere, the first ball head 1511 can enter and exit the first groove 15211 without obstruction. Furthermore, the limiting bottom ring 1532 effectively limits the first ball head 1511 within the first groove 15211, preventing it from dislodging. Setting the inner circumferential surface of the limiting bottom ring 1532 to a spherical ring surface that matches the first ball head 1511 increases the contact area between them, preventing the limiting bottom ring 1532 from scratching the first ball head 1511. The locking ring 1531 is preferably equilateral polygonal in shape (e.g., equilateral hexagonal), facilitating rotation of the locking ring 1531 by inserting a wrench or other tools laterally between the base 11 and the support platform 12.

[0036] The first ball head 151 and the first ball cup 152 constitute the core of the omnidirectional rotation. One is fixed to the base 11, and the other is fixed to the support platform 12. Multi-angle free rotation is achieved through spherical contact. After angle adjustment, mechanical locking is performed by the locking element 153 to restrict the relative rotation between the first ball head 151 and the first ball cup 152, ensuring that the support platform 12 stably maintains the set angle. The support platform 12 is allowed to tilt ±30° around the ball center, covering most rebar installation test scenarios. The first ball recess 1521 is provided with a first groove 15211 that fits against the first ball head 1511. Precise surface fit ensures uniform sliding resistance of the ball head within the ball cup, reducing jamming and enabling smooth adjustment of the support platform 12 at multiple angles. In rebar pull-out tests, it can accurately match different rebar installation directions, improving the accuracy of the test data. A locking ring 1531 is fitted onto the outer circumferential surface of the first ball recess 1521, and the two are threaded together. Specifically, the outer circumferential surface of the first ball recess 1521 and the inner wall of the locking ring 1531 are provided with mating threads. When locked together, the first ball head 1511 is confined within a closed space. A threaded locking element 1533 is a bolt, arranged radially along the locking ring, and its end can directly pass through the locking ring 1531 and abut against the first ball head 1511. By rotating the threaded locking element 1533, the "tightening and locking" or "loosening and unlocking" states can be quickly switched. The threaded locking element 1533 provides progressive clamping force through threaded transmission, and the operator can flexibly adjust the locking force according to the test scenario.

[0037] like Figure 6 As shown, the end of the adjusting screw 16 is connected to the support platform 12 via a second universal joint 161. The second universal joint 161 employs a ball joint, as is common in the art, comprising a second ball head and a second ball cup. The second ball head is fixed to the end of the adjusting screw 16, and the second ball cup is fixed to the support platform 12. The second universal joint 161 allows for multi-angle relative rotation between the end of the adjusting screw 16 and the support platform 12, preventing axial additional torque or bending stress from the adjusting screw 16 when the support platform 12 is tilted. When the support platform 12 rotates around the first universal joint 15 to a tilted state, the second universal joint 161 can adaptively adjust the spatial angle of the screw 16, ensuring that the screw always drives the support platform 12 with axial force, rather than generating lateral force or jamming.

[0038] like Figure 6As shown, an annular fixing plate 131 is fitted around the outer periphery of one end of the lifting member 13, and the support platform 12 is provided with a clamping unit 121 for clamping and fixing the annular fixing plate 131. Multiple clamping units 121 can be arranged around the annular fixing plate 131, such as four. The annular fixing plate 131 is fitted around the outer periphery of the lifting member 13 and forms full circumferential contact with the support platform 12. The support platform 12 applies axial pressure to the annular fixing plate 131 through the clamping unit 121, which can quickly complete the positioning and locking of the lifting member 13 before the test, avoid displacement of the lifting member 13 due to vibration or load changes during the pull-out test, and ensure the accuracy of the test data. The clamping unit 121 includes a rotating shaft 1211 fixed to the support platform 12, an L-shaped pressure plate 1212 rotatably mounted on the rotating shaft 1211, and an elastic washer 1213 sleeved on the rotating shaft 1211. The end of the rotating shaft 1211 has a step 12111. The elastic washer 1213 is located between the step 12111 and the pressure plate 1212. Rotating the pressure plate 1212 allows its surface to press against the annular fixing plate 131. The pressure plate 1212 can rotate freely via the rotating shaft 1211, automatically adjusting the clamping direction according to the surface angle of the annular fixing plate 131 to ensure a tight fit between the contact surfaces. The elastic washer 1213, sleeved between the step 12111 of the rotating shaft 1211 and the pressure plate 1212, utilizes material elasticity to provide continuous preload, compensating for assembly gaps and vibration displacement, and improving clamping stability. The pressure plate 1212 has a first insertion hole 12121, and the annular fixing plate 131 has a second insertion hole 1311 that matches the first insertion hole 12121. The clamping unit 121 also includes a pin 1214 that can be inserted into the first insertion hole 12121 and the second insertion hole 1311. Through the mating system consisting of the first insertion hole 12121 of the pressure plate 1212, the second insertion hole 1311 of the annular fixing plate 131, and the pin 1214, rapid positioning and rigid locking are achieved. After the pin 1214 passes through the aligned first insertion hole 12121 and second insertion hole 1311, the rigid contact of the metal material restricts the lateral and rotational degrees of freedom between the pressure plate 1212 and the annular fixing plate 131, forming a hole-shaft mating locking effect. The matching design of the insertion holes allows the pin 1214 to be quickly inserted without precise alignment, reducing the skill requirements for operators.

[0039] In this implementation, the combination design of the first universal hinge 15 and the adjusting screw 16 allows the support platform 12 to be adjusted at multiple angles on the base 11. This enables the testing mechanism 1 to adapt to the rebar installation testing requirements at different angles and positions, ensuring that the test axis is consistent with the rebar centerline. This is particularly suitable for rebar pull-out testing on irregular or inclined surfaces, greatly expanding the applicability of the equipment. The lifting component 13 is detachably mounted on the support platform 12, and the anchor 14 can be replaced according to testing requirements, achieving modular and standardized management of the equipment. The connection between the manual pump and the lifting component 13 enables non-powered hydraulic loading of the rebar installation. This is simple to operate, precise to control, and can achieve uniform loading and stable output, effectively reducing errors caused by unstable loading during testing. The manual pump requires no external power supply, making it convenient for use on construction sites, at heights, or in environments without power.

[0040] In the description of this utility model, it should be understood that terms such as "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and 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. Therefore, they should not be construed as limitations on this utility model.

[0041] Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, the inclusion of "first," "second," etc., in a feature may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0042] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An adjustable bonded tendon pull test apparatus comprising a detection mechanism and a hand pump connected to the detection mechanism, characterised in that, The detection mechanism includes a base, a support platform mounted on the base, a lifting component detachably mounted on the support platform, and anchors. A first universal joint is provided between the support platform and the base. An adjusting screw is provided on the base, and the end of the adjusting screw is connected to the support platform. Rotating the adjusting screw can cause the support platform to rotate around the first universal joint to adjust the angle of the support platform relative to the base.

2. The adjustable rebar pull-out testing device according to claim 1, characterized in that, Two adjusting screws are provided, and the two adjusting screws and the first universal joint are arranged in a triangle.

3. The adjustable rebar pull-out testing device according to claim 1, characterized in that, The first universal joint includes a first ball head, a first ball cup, and a locking member. The first ball head is inserted into the first ball cup and is rotatably connected to the first ball cup. The locking member is used to lock the first ball cup to limit its rotation. One of the first ball head and the first ball cup is fixed to the base, and the other is fixed to the support platform.

4. The adjustable rebar pull-out testing device according to claim 3, characterized in that, The first ball head includes a first ball head and a first ball rod connected to the first ball head. The end of the first ball rod away from the first ball head is fixed to the base. The first ball cup includes a first ball recess and a first ball seat connected to the first ball recess. The first ball seat is fixed to the support platform. The first ball recess has a first groove that fits with the first ball head. The first ball head is embedded in the first groove and can slide freely.

5. The adjustable rebar pull-out testing device according to claim 4, characterized in that, The locking element includes a locking ring sleeved on the outer peripheral surface of the first ball recess and a threaded locking element disposed on the locking ring, the end of which can pass through the locking ring and abut against the head of the first ball.

6. The adjustable rebar pull-out testing device according to claim 1, characterized in that, The end of the adjusting screw is connected to the support platform via a second universal joint.

7. The adjustable rebar pull-out testing device according to claim 1, characterized in that, An annular fixing plate is fitted around one end of the lifting member, and the support platform is provided with a clamping unit for pressing and fixing the annular fixing plate.

8. The adjustable rebar pull-out testing device according to claim 7, characterized in that, The pressing unit includes a rotating shaft fixed to the support platform, a pressure plate rotatably mounted on the rotating shaft, and an elastic gasket sleeved on the rotating shaft. The end of the rotating shaft is provided with a step, and the elastic gasket is located between the step and the pressure plate. Rotating the pressure plate can cause the surface of the pressure plate to press against the annular fixing plate.

9. The adjustable rebar pull-out testing device according to claim 8, characterized in that, The pressure plate has a first insertion hole, the annular fixing plate has a second insertion hole that matches the first insertion hole, and the clamping unit also includes a pin that can be inserted into the first insertion hole and the second insertion hole.

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