A concrete anchor bolt pull-out test fixture

Abstract

This utility model relates to a concrete anchor bolt pull-out test fixture, including a pull-out rod assembly and a hydraulic cylinder. The piston rod of the hydraulic cylinder is connected to the pull-out rod assembly. The pull-out rod assembly includes a pull-out sleeve, a clamping sleeve, and a rotating sleeve. The pull-out sleeve includes a sleeve part and a support part. The sleeve part is located at the front end of the support part, and the clamping sleeve is slidably fitted at the rear end of the sleeve part. A sleeve groove is opened at the front end of the sleeve part, and the inner wall of the sleeve groove is threaded to the anchor bolt. The side wall of the sleeve groove is divided by several axially arranged slots. The outer wall of the sleeve part has a conical structure and is fitted with the clamping sleeve. The outer wall of the clamping sleeve is threaded to the rotating sleeve. The rear end of the rotating sleeve is rotatably connected to the support part. The rotation of the rotating sleeve causes the clamping sleeve to move on the sleeve part under the action of the thread, and the inner wall of the conical surface of the clamping sleeve and the outer wall of the conical surface of the sleeve part abut against each other, so as to realize the clamping and fixing of the front side wall of the sleeve part to the anchor bolt surface, ensuring the connection stability between the pull-out sleeve and the anchor bolt, and preventing the problem of thread deformation and slippage due to excessive pressure.

Description

Technical Field

[0001] This utility model relates to the field of pull-out testing fixtures, and in particular to a pull-out testing fixture for concrete anchor bolts. Background Technology

[0002] Anchor bolts are widely used mechanical connectors on construction sites. According to national standards, anchor bolts are required to have strong anchoring force in the component. During construction, pull-out force testing of anchor bolts is essential to ensure proper installation and the required load-bearing capacity. Chinese patent document CN202221763097.8 discloses a chemical anchor bolt pull-out load-bearing capacity testing device. However, this application uses only a single connecting nut fixed to the anchor bolt via a threaded connection. During the pull-out test, the enormous pull-out force causes the threads inside the threaded connection sleeve to wear and deform easily, reducing engagement capacity and making it prone to slippage under high pressure, thus affecting the connection stability between the pull-out clamp and the anchor bolt. Utility Model Content

[0003] To address the aforementioned problems, this utility model discloses a concrete anchor bolt pull-out test fixture, which solves the problem that the existing pull-out clamps, which use a single thread for fixing, are prone to slippage between the clamp and the anchor bolt.

[0004] The specific technical solution is as follows:

[0005] A concrete anchor bolt pull-out test fixture includes a pull-out rod assembly and a hydraulic cylinder. One end of the hydraulic cylinder is supported on a wall by a positioning bracket. One end of the piston rod of the hydraulic cylinder is connected to the pull-out rod assembly. The pull-out rod assembly includes a pull-out sleeve, a clamping sleeve, and a rotating sleeve. The pull-out sleeve includes a sleeve portion and a support portion. The rear end of the support portion is rotatably connected to the front end of the piston rod of the hydraulic cylinder. The sleeve portion is located at the front end of the support portion. The clamping sleeve is slidably fitted onto the rear end of the sleeve portion. A sleeve groove for fitting onto the anchor bolt is formed on the front end face of the sleeve portion. An internal thread is formed on the inner wall of the sleeve groove. Used for threaded connection with anchor bolts, and the sidewall of the sleeve groove is divided by several axially arranged slots. The outer wall of the sleeve rod is conical and the clamping sleeve is fitted on it. The inner wall of the front end of the clamping sleeve is also conical and fits against the conical outer wall of the front end of the sleeve rod. The rotating sleeve is threadedly connected to the outer wall of the clamping sleeve. The rear end of the rotating sleeve is rotatably connected to the support. By rotating the rotating sleeve, the clamping sleeve is displaced on the sleeve rod under the action of the thread, and the conical inner wall of the clamping sleeve and the conical outer wall of the sleeve rod are pressed together, so as to realize the clamping and fixing of the front end sidewall of the sleeve rod to the anchor bolt surface.

[0006] Furthermore, the rear end of the sleeve is provided with a number of guide bars distributed circumferentially, each guide bar being arranged axially, and the inner wall of the rear end of the clamping sleeve is provided with a number of guide grooves that are adapted to the guide bars, so as to realize the sliding connection between the clamping sleeve and the sleeve.

[0007] Furthermore, the front end of the slot extends to the end face of the sleeve, and the length of the slot is less than the length of the sleeve groove.

[0008] Furthermore, a groove is provided on the outer wall of the front end of the support portion, and a protrusion adapted to the groove is provided on the inner wall of the rear end of the rotating sleeve. The protrusion is embedded in the groove to realize the rotational connection between the rotating sleeve and the support portion.

[0009] Furthermore, anti-slip textures are provided on the outer wall of the support and the outer wall of the rotating sleeve.

[0010] Furthermore, the positioning bracket includes a positioning ring, a support rod, and a fixing sleeve. The positioning ring is circular, and the positioning ring end face is fixedly connected to the fixing sleeve by a number of support rods. The fixing sleeve is fixedly connected to the end face of the hydraulic cylinder.

[0011] The beneficial effects of this utility model are reflected in:

[0012] In this invention, the pull-out sleeve is fixed to the front thread of the anchor bolt by means of a threaded connection. At the same time, the front side wall of the sleeve is clamped and fixed to the rear end of the anchor bolt by means of a clamping sleeve that engages with the tapered outer wall of the front end of the sleeve. This further fixes the sleeve and ensures the connection stability between the pull-out sleeve and the anchor bolt, preventing slippage due to thread deformation. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of the pull rod assembly and anchor bolt in this utility model.

[0014] Figure 2 This is a side sectional view of the pull-out sleeve rod in the structure of this utility model.

[0015] Figure 3 This is a schematic diagram of the pull rod assembly in this utility model.

[0016] Explanation of reference numerals in the attached drawings: 1. Hydraulic cylinder; 2. Pulling sleeve; 3. Sleeve part; 31. Slot; 32. Guide bar; 33. Support part; 4. Rotating groove; 41. Rotating block; 42. Groove; 43. Clamping sleeve; 5. Guide groove; 51. Rotating sleeve; 6. Protrusion; 61. Positioning ring; 7. Support rod; 8. Fixing sleeve; 9. Anchor bolt; 10. Detailed Implementation

[0017] To make the technical solution of this utility model clearer and more explicit, the utility model will be further described below with reference to the accompanying drawings. Any solution derived by equivalent substitution and conventional reasoning of the technical features of this utility model falls within the protection scope of this utility model. The fixed connections and fixed settings mentioned in this utility model are all common connection methods in the mechanical field, including welding, bolt and nut connections, and screw connections.

[0018] In the description of this utility model, it should be understood that the terms "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.

[0019] Please see the appendix Figure 1-3 This embodiment provides a concrete anchor pull-out test fixture, including a pull-out rod assembly and a hydraulic cylinder 1. One end of the hydraulic cylinder 1 is supported on the wall by a positioning bracket. One end of the piston rod of the hydraulic cylinder 1 is connected to the pull-out rod assembly. The pull-out rod assembly includes a pull-out sleeve 2, a clamping sleeve 5, and a rotating sleeve 6. The pull-out sleeve 2 includes a sleeve part 3 and a support part 4. A rotating groove 41 is opened at the rear end of the support part 4. A cylindrical rotating block 42 is rotatably disposed in the rotating groove 41. An opening for accommodating the piston rod of the hydraulic cylinder 1 is opened at the rear end of the rotating groove 41. The piston rod of the hydraulic cylinder 1 is fixedly connected to the end face of the rotating block 42, realizing the rotatable connection between the pull-out sleeve 2 and the piston rod of the hydraulic cylinder 1.

[0020] The support part 4 is provided with a sleeve part 3 at the front end. The rear end surface of the sleeve part 3 is slidably fitted with a clamping sleeve 5. The front end face of the sleeve part 3 is provided with a sleeve groove 31 for fitting onto the anchor bolt 10. The inner wall of the sleeve groove 31 is provided with an internal thread for threaded connection with the anchor bolt. The side wall of the sleeve groove 31 is divided by several axially arranged strip-shaped slots 32. The outer wall of the sleeve part 3 has a conical structure and is fitted with the clamping sleeve 5. The inner wall of the front end of the clamping sleeve 5 is also conical and fits against the conical outer wall of the front end of the sleeve part 3. The outer wall of the clamping sleeve 5 is threadedly connected to a rotating sleeve 6. The rear end of the rotating sleeve 6 is rotatably connected to the support part 4.

[0021] By rotating the sleeve 6, the clamping sleeve 5 is displaced on the sleeve rod 3 under the action of the thread, and the inner wall of the conical surface of the clamping sleeve 5 is pressed against the outer wall of the conical surface of the sleeve rod 3, so as to achieve clamping and fixing of the front side wall of the sleeve rod 3 to the anchor bolt surface.

[0022] In this embodiment, a plurality of guide bars 33 are distributed circumferentially at the rear end of the sleeve rod 3, and each guide bar 33 is arranged axially. A plurality of guide grooves 51 adapted to the guide bars 33 are provided on the inner wall of the rear end of the clamping sleeve 5, so as to realize the sliding connection between the clamping sleeve 5 and the sleeve rod 3.

[0023] In this embodiment, the front end of the slot 32 extends to the end face of the sleeve rod portion 3, and the length of the slot 32 is less than the length of the sleeve groove 31.

[0024] In this embodiment, a groove 43 is provided on the outer wall of the front end of the support portion 4, and a protrusion 61 adapted to the groove 43 is provided on the inner wall of the rear end of the rotating sleeve 6. The protrusion 61 is embedded in the groove 43 to realize the rotational connection between the rotating sleeve 6 and the support portion 4. Furthermore, anti-slip textures are provided on the outer wall of both the support portion 4 and the outer wall of the rotating sleeve 6 to facilitate the rotation and pulling of the sleeve rod 2 and the rotating sleeve 6.

[0025] In this embodiment, the positioning bracket includes a positioning ring 7, a support rod 8, and a fixing sleeve 9. The positioning ring 7 is circular. One end face of the positioning ring 7 is in contact with the wall surface, and the position of this end face of the positioning ring 7 exceeds the position of the front end face of the sleeve rod 3. The other end face of the positioning ring 7 is fixedly connected to the fixing sleeve 9 by several support rods 8. The fixing sleeve 9 is fixedly connected to the end face of the hydraulic cylinder 1.

[0026] The working principle of this utility model is as follows: When fixing with the anchor bolt, the sleeve part 3 is aligned with the anchor bolt and the support part 4 is rotated. After being threadedly connected with the anchor bolt 10, the rotating sleeve 6 is rotated to make the clamping sleeve 5 move forward under the action of the thread. During this process, the inner wall of the conical surface of the clamping sleeve 5 cooperates with the outer wall of the conical surface of the sleeve part 3, thereby causing the front side wall of the sleeve part 3 to be compressed and the anchor bolt to be further clamped and fixed, thus completing the positioning.

[0027] The above description is merely a preferred embodiment of this utility model, but the scope of protection of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the scope of protection of this utility model. Therefore, the scope of protection of this utility model should be determined by the scope of the claims.

Claims

1. A concrete anchor bolt pull-out test fixture, comprising a pull-out rod assembly and a hydraulic cylinder (1), wherein one end of the hydraulic cylinder (1) is supported on a wall surface by a positioning bracket, and one end of the piston rod of the hydraulic cylinder (1) is connected to the pull-out rod assembly, characterized in that, The pull rod assembly includes a pull rod (2), a clamping sleeve (5), and a rotating sleeve (6). The pull rod (2) includes a rod portion (3) and a support portion (4). The rear end of the support portion (4) is rotatably connected to the front end of the piston rod of the oil cylinder (1). The rod portion (3) is located at the front end of the support portion (4). The clamping sleeve (5) is slidably sleeved at the rear end of the rod portion (3). A sleeve groove (31) for sleeved onto the anchor bolt (10) is provided on the front end face of the rod portion (3). An internal thread is provided on the inner wall of the sleeve groove (31) for threaded connection with the anchor bolt. The side wall of the sleeve groove (31) is provided with several axially arranged... The slot (32) is used for separation. The outer wall of the sleeve rod (3) has a conical structure and is fitted with the clamping sleeve (5). The inner wall of the front end of the clamping sleeve (5) is also conical and fits against the outer wall of the conical surface of the front end of the sleeve rod (3). The rotating sleeve (6) is threaded on the outer wall of the clamping sleeve (5). The rear end of the rotating sleeve (6) is rotatably connected to the support part (4). By rotating the rotating sleeve (6), the clamping sleeve (5) is displaced on the sleeve rod (3) under the action of the thread, and the inner wall of the conical surface of the clamping sleeve (5) is pressed against the outer wall of the conical surface of the sleeve rod (3), so that the front side wall of the sleeve rod (3) clamps and fixes the anchor bolt surface.

2. The concrete anchor bolt pull-out test fixture as described in claim 1, characterized in that, The rear end of the sleeve rod (3) is provided with a number of guide strips (33) distributed circumferentially, and each guide strip (33) is arranged axially. The inner wall of the rear end of the clamping sleeve (5) is provided with a number of guide grooves (51) that are adapted to the guide strips (33) to realize the sliding connection between the clamping sleeve (5) and the sleeve rod (3).

3. The concrete anchor bolt pull-out test fixture as described in claim 1, characterized in that, The front end of the slot (32) extends to the end face of the sleeve (3), and the length of the slot (32) is less than the length of the sleeve groove (31).

4. The concrete anchor bolt pull-out test fixture as described in claim 1, characterized in that, The support part (4) has a groove (43) on its front outer wall, and the rotating sleeve (6) has a protrusion (61) on its rear inner wall that matches the groove (43). The protrusion (61) is embedded in the groove (43) to realize the rotational connection between the rotating sleeve (6) and the support part (4).

5. The concrete anchor bolt pull-out test fixture as described in claim 4, characterized in that, The outer wall of the support part (4) and the outer wall of the rotating sleeve (6) are both provided with anti-slip texture.

6. The concrete anchor bolt pull-out test fixture as described in claim 1, characterized in that, The positioning bracket includes a positioning ring (7), a support rod (8), and a fixing sleeve (9). The positioning ring (7) is circular. The end face of the positioning ring (7) is fixedly connected to the fixing sleeve (9) by several support rods (8). The fixing sleeve (9) is fixedly connected to the end face of the oil cylinder (1).

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