A clamp for reinforcing bar drawing detection

Abstract

The utility model provides a kind of clamp for steel bar drawing detection, including bearing plate, the bottom of bearing plate is equipped with through hole, two slidingly connected with one number of abutment on bearing plate, through hole is located between two one number of abutment, the side of two one number of abutment opposite each other is all inclined to set;The upper portion of bearing plate is equipped with the movable ring of liftable, and the inner ring surface of movable ring is respectively contacted with the inclined surface of two one number of abutment;Fixed frame is fixed on bearing plate, and fixed frame is screw-connected with screw rod for driving movable ring.The utility model is mutually close to two one number of abutment, to facilitate the steel bar of different thickness is fixed, then drawing detection is carried out, and operation process is simple, improves the efficiency of steel bar drawing detection, and reduces the labor burden of staff.

Description

Technical Field

[0001] This utility model relates to the field of clamp technology, and in particular to a clamp for detecting the pull-out of reinforcing bars. Background Technology

[0002] The rebar pull-out test is an on-site test of the anchoring force of the anchor body. Generally, 48-72 hours after rebar installation, a pull-out test can be conducted on the installed rebar using a tension gauge (jack). To reduce the constraint of the jack on the concrete near the anchor bar, a channel steel or support is used to support it, with the support point distance ≥max (3d, 60mm). Then, a uniform load is applied for 2 to 3 minutes until failure. The failure modes are divided into three types: rebar failure (rebar breakage), adhesive cross-section failure (rebar pull-out along the interface between the structural adhesive and the rebar), and mixed failure (the upper concrete cone fails, and the lower part is pulled out along the interface between the structural adhesive and the concrete). For rebar installation in structural members, the failure mode should preferably be controlled to rebar breakage. However, the clamps used to fix steel bars nowadays cannot be quickly adjusted according to the size and type of the steel bars. Different sizes and types of steel bars require different clamps for fixing, which is cumbersome. As a result, when pulling out steel bars in a field, multiple clamps need to be carried, which increases the workload of the staff. Utility Model Content

[0003] This utility model discloses a clamp for testing the pull-out of reinforcing bars, which solves the problem that current clamps cannot be quickly adjusted according to the size and type of reinforcing bars, and different clamps are needed to fix reinforcing bars of different sizes and types.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: A clamp for testing the pull-out of reinforcing bars includes a bearing plate with a through hole at the bottom. Two No. 1 blocks are slidably connected on the bearing plate, with the through hole located between the two No. 1 blocks. The opposing sides of the two No. 1 blocks are both inclined. A movable ring that can be raised and lowered is provided above the bearing plate. The inner ring surface of the movable ring contacts the inclined surfaces of the two No. 1 blocks respectively. A fixing frame is fixed on the bearing plate, and a screw for driving the movable ring is threadedly connected to the fixing frame.

[0005] Compared with the prior art, the present invention has the following beneficial effects: One end of the reinforcing bar is passed through the hole and positioned between two No. 1 abutment blocks. Then, the screw is rotated to drive the moving ring downwards, causing the two No. 1 abutment blocks to move closer together and clamp the reinforcing bar in place. An external power device is connected to a fixing frame, which pushes the bearing plate upwards to perform pull-out testing on the reinforcing bar. This utility model uses the mutual approach of the two No. 1 abutment blocks to facilitate the fixing of reinforcing bars of different thicknesses before performing pull-out testing. The operation process is simple, improving the efficiency of reinforcing bar pull-out testing and reducing the workload of workers. Attached Figure Description

[0006] Figure 1 This is a schematic diagram of the structure of this utility model from a frontal sectional view; Figure 2 This is a side view of the structure of the No. 2 abutment block of this utility model.

[0007] In the diagram: 1. Support plate; 2. Perforation; 3. First abutment block; 31. Slider; 4. Moving ring; 41. Connecting block; 42. Limiting rod; 5. Fixing frame; 51. Screw; 52. Connecting seat; 53. Threaded column; 54. Abutment plate; 6. Second abutment block; 61. Connecting rod; 62. Reinforcing rib; 7. Lifting ring; 71. Vertical rod; 8. Positioning cylinder; 9. Tooth. Detailed Implementation

[0008] The specific content of this utility model will be described in detail below with reference to the accompanying drawings and embodiments.

[0009] like Figure 1 As shown, this utility model provides a clamp for testing the pull-out of reinforcing bars, including a bearing plate 1, a through hole 2 at the bottom of the bearing plate 1, two first blocks 3 slidably connected on the bearing plate 1, the through hole 2 being located between the two first blocks 3, and the opposite sides of the two first blocks 3 being inclined; a movable ring 4 that can be raised and lowered is provided above the bearing plate 1, the inner ring surface of the movable ring 4 contacting the inclined surfaces of the two first blocks 3 respectively; a fixing frame 5 is fixed on the bearing plate 1, and a screw 51 that is threadedly connected to the fixing frame 5 and rotatably connected to the movable ring 4 for driving the movable ring 4. After one end of the reinforcing bar passes through the hole 2 and is positioned between the two No. 1 abutments 3, the screw 51 is rotated to move the moving ring 4 downwards. The moving ring 4 then brings the two No. 1 abutments 3 closer together, clamping and fixing the reinforcing bar. After the fixing frame 5 is connected to an external power device (such as a tensile machine or a hydraulic power system; a hydraulic power system such as an electric hydraulic pump: the hydraulic pump is driven by an electric motor to generate high-pressure oil to push the piston of the oil cylinder to move, driving the clamp to rise, which has the characteristics of large output and high stability, and is suitable for high-strength pull-out tests; a manual hydraulic pump: the manual pump is operated manually to pressurize, which is suitable for tests without power supply or with small tonnage), an upward force can be applied to the bearing plate 1 through the fixing frame 5 to perform pull-out tests on the reinforcing bar. The two No. 1 abutments 3 are brought closer together to facilitate the clamping and fixing of reinforcing bars of different thicknesses.

[0010] like Figure 1 and Figure 2 As shown, two symmetrically arranged second-order abutment blocks 6 are provided above the moving ring 4, and two first-order abutment blocks 3 are symmetrically distributed left and right. An L-shaped connecting rod 61 is fixed to the bottom of the second-order abutment blocks 6 via a fixing rod. The bottom of the connecting rod 61 is slidably connected to the bearing plate 1. The moving ring 4 is located between the two connecting rods 61. Above the moving ring 4, a lifting ring 7 is provided, whose inner ring surface contacts the inclined surfaces of the two second-order abutment blocks 6. A vertical rod 71 is fixed between the lifting ring 7 and the moving ring 4. When the screw 51 is rotated to move the moving ring 4 downwards, the moving ring 4 can drive the lifting ring 7 downwards via the vertical rod 71, and the lifting ring 7 can bring the two second-order abutment blocks 6 closer together. The two second-order abutment blocks 6 then hold the front and back sides of the reinforcing bar together. Figure 1 The steel bar is clamped and fixed in the position shown in the figure, and then the two No. 1 abutment blocks 3 are used to clamp and fix both sides of the steel bar to further increase the fixing effect of the steel bar and prevent the steel bar from slipping. The moving ring 4 is located between the two connecting rods 61. The connecting rods 61 are L-shaped, which can effectively avoid affecting the normal lifting and lowering of the moving ring 4. An L-shaped reinforcing rib 62 is fixed on the outer wall of the connecting rod 61. One end of the reinforcing rib 62 is fixed to the fixed rod. The reinforcing rib 62 can increase the stability of the connecting rod 61 and prevent the connecting rod 61 from deforming.

[0011] like Figure 1 As shown, a connecting block 41 is fixed on the moving ring 4 and rotatably connected to the bottom end of the screw 51. A limiting rod 42 is fixed on the bearing plate 1. The limiting rod 42 passes through the connecting block 41 and is slidably connected to the connecting block 41. There are two connecting blocks 41, which are located on both sides of the moving ring 4. There are also two corresponding screws 51. Rotating the two screws 51 can cause the connecting block 41 to drive the moving ring 4 to move downward or upward. The limiting rod 42 can increase the stability of the connecting block 41 when it moves upward or downward.

[0012] like Figure 1 As shown, the first abutment block 3 and the second abutment block 6 are respectively provided with teeth 9 on the side near the through hole 2. The teeth 9 are provided so that the two first abutment blocks 3 and the two second abutment blocks 6 can better clamp and fix the steel bar, and increase the friction with the surface of the steel bar.

[0013] like Figure 1As shown, a connecting seat 52 is fixed on the fixed frame 5, and a reinforcing block connected to the fixed frame 5 is fixed on the connecting seat 52; a slider 31 is fixed to the bottom of the first abutment block 3, and a slide rail adapted to the slider 31 is provided on the bearing plate 1. There are two connecting seats 52, which are respectively set on both sides of the fixed frame 5. They can be connected to an external power device through the connecting seats 52. The reinforcing block can increase the firmness of the connection between the connecting seat 52 and the fixed frame 5. A reinforcing plate connected to the bearing plate 1 is also fixed to the bottom of the fixed frame 5; the first abutment block 3 can slide in the slide rail on the bearing plate 1 through the slider 31.

[0014] like Figure 1 As shown, a positioning cylinder 8 is threadedly connected to the top surface of the fixing frame 5, and the axis of the positioning cylinder 8 corresponds to the axis of the through hole 2. Threaded posts 53 are threadedly connected to the vertical surfaces on both sides of the fixing frame 5. One end of the threaded post 53 located inside the fixing frame 5 is rotatably connected to a stop plate 54, and the bottom of the stop plate 54 is slidably connected to the top of the bearing plate 1. Depending on the type of reinforcing bar, a positioning cylinder 8 corresponding to the size of the reinforcing bar can be threaded onto the top surface of the fixing frame 5, allowing one end of the reinforcing bar to pass through the through hole and enter the positioning cylinder 8, thus positioning the reinforcing bar. This allows the two stop blocks 3 to come together and better clamp and fix the reinforcing bar. After the reinforcing bar is fixed, the two threaded posts 53 can be rotated to bring the two stop plates 54 closer together. The opposing surfaces of the two stop plates 54 then abut against the opposite sides of the two connecting blocks 41, clamping and fixing the two connecting blocks 41 and increasing the stability of the moving ring 4.

[0015] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the spirit and scope of the technical solutions of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A clamp for testing the pull-out of reinforcing bars, comprising a bearing plate (1), characterized in that: The bottom of the support plate (1) is provided with a through hole (2), and two No. 1 blocks (3) are slidably connected on the support plate (1). The through hole (2) is located between the two No. 1 blocks (3), and the opposite sides of the two No. 1 blocks (3) are inclined. A movable ring (4) that can be raised and lowered is provided above the support plate (1). The inner ring surface of the movable ring (4) is in contact with the inclined surfaces of the two No. 1 blocks (3) respectively. A fixed frame (5) is fixed on the support plate (1), and a screw (51) that is rotatably connected to the movable ring (4) and used to drive the movable ring (4) is threaded on the fixed frame (5).

2. The fixture for testing the pull-out of reinforcing bars according to claim 1, characterized in that: The moving ring (4) is provided with two second blocks (6) that are symmetrical front and back, and two first blocks (3) are symmetrically distributed left and right. The bottom of the second block (6) is fixed with an L-shaped connecting rod (61) by a fixing rod. The bottom of the connecting rod (61) is slidably connected to the bearing plate (1). The moving ring (4) is located between the two connecting rods (61). The moving ring (4) is provided with a lifting ring (7) whose inner ring surface is in contact with the inclined surface of the two second blocks (6) above the moving ring (4). A vertical rod (71) is fixed between the lifting ring (7) and the moving ring (4).

3. A clamp for testing the pull-out of reinforcing bars according to claim 1, characterized in that: The moving ring (4) is fixed with a connecting block (41) that is rotatably connected to the bottom end of the screw (51). The bearing plate (1) is fixed with a limit rod (42). The limit rod (42) passes through the connecting block (41) and is slidably connected to the connecting block (41).

4. A clamp for testing the pull-out of reinforcing bars according to claim 1, characterized in that: The first abutment block (3) and the second abutment block (6) are respectively provided with teeth (9) on the side near the perforation (2).

5. A clamp for testing the pull-out of reinforcing bars according to claim 1, characterized in that: The fixed frame (5) is fixed with a connecting seat (52), and the connecting seat (52) is fixed with a reinforcing block connected to the fixed frame (5); the bottom of the first abutment block (3) is fixed with a slider (31), and the bearing plate (1) is provided with a slide rail adapted to the slider (31).

6. A clamp for testing the pull-out of reinforcing bars according to claim 1, characterized in that: The top surface of the fixing frame (5) is threaded with a positioning cylinder (8), and the center of the positioning cylinder (8) corresponds to the center of the through hole (2).

7. A clamp for testing the pull-out of reinforcing bars according to claim 1, characterized in that: Both sides of the fixed frame (5) are threaded with threaded columns (53). One end of the threaded column (53) located inside the fixed frame (5) is rotatably connected to a stop plate (54). The bottom of the stop plate (54) is slidably connected to the top of the bearing plate (1).

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