Device for detecting prestress under concrete beam anchor

Abstract

The utility model discloses a concrete beam under-anchor prestress detection device which comprises an anchor backing plate, a working anchor, a limiting block, a jack, a stress tester and a tool anchor which are sequentially sleeved on the outer side of a steel strand, the working anchor and the tool anchor have the same structure and are respectively provided with a plurality of through holes for the steel strand to pass through in the axial direction, and anchor clamping pieces of the steel strand are arranged in the through holes. A limiting groove matched with the working anchor is formed in one side of the limiting block, and a limiting hole of the anchor clamping piece is formed in the position, corresponding to the through hole, of the limiting groove. A supporting cylinder is further arranged on the side, connected with the limiting block, of the jack and arranged on the outer sides of the working anchor and the limiting block, a supporting block is arranged on the side, facing the anchor bearing plate, of the supporting cylinder, and an adjusting mechanism for axially adjusting the supporting block is arranged on the supporting cylinder. According to the concrete beam under-anchor prestress detection device, adaptive adjustment can be conveniently carried out according to different test positions, measurement errors are reduced, and equipment is not prone to being damaged.

Description

Technical Field

[0001] This utility model relates to the field of anchorage prestress detection, and in particular to a device for detecting anchorage prestress in concrete beams. Background Technology

[0002] During the construction of prestressed concrete beams, the load-bearing capacity of the structure is enhanced by tensioning steel strands, and anchorage prestress testing is a crucial quality control step. Testing equipment commonly uses jacks to tension the steel strands under the concrete beam. During tensioning, a reaction cylinder is typically used to support the jacks against the concrete beam wall. However, the surface of each concrete beam wall to be tested is not uniformly smooth. Current technology generally relies on chains to lift the jacks in conjunction with the reaction cylinder support, which is inconvenient for adaptive adjustments based on different test locations. If the tensioning direction of the jacks supported by the reaction cylinder deviates too much from the direction of the steel strands, it can easily lead to measurement errors or equipment damage. Utility Model Content

[0003] To address the aforementioned issues, this invention provides a prestress detection device for concrete beam anchorages, which allows for adaptive adjustments based on different test locations, reduces measurement errors, and is less prone to damage.

[0004] The technical solution of this utility model is as follows:

[0005] A prestress testing device for concrete beam anchorage includes an anchor plate, a working anchor, a limiting block, a jack, a stress tester, and a tool anchor, which are sequentially sleeved on the outside of a steel strand. The working anchor and the tool anchor have identical structures and are provided with several through holes for the steel strand to pass through in the axial direction. Anchor clamps for the steel strand are provided in the through holes. One side of the limiting block is provided with a limiting groove that matches the working anchor, and the limiting groove is provided with a limiting hole for the anchor clamp at the corresponding through hole. A support cylinder is also provided on the side of the jack connected to the limiting block. The support cylinder is located outside the working anchor and the limiting block. A support block is provided on the side of the support cylinder facing the anchor plate, and an adjustment mechanism for axially adjusting the support block is provided on the support cylinder.

[0006] In a further technical solution, the edge of the support cylinder is provided with a threaded hole, and the adjustment mechanism includes an adjustment handle and a lead screw. The lead screw passes through the threaded hole, with one end rotatably connected to the support block and the other end connected to the handle.

[0007] In a further technical solution, a support ring is provided on the inner side of the support cylinder near the anchor plate, the support cylinder is sleeved on the outside of the jack, and the support ring abuts against the end of the jack.

[0008] In a further technical solution, the threaded holes include four, arranged in a ring array around the support cylinder.

[0009] In a further technical solution, one end of the lead screw rotatably connects to the support block in the shape of a ball head.

[0010] In a further technical solution, the anchor clip includes two symmetrically arranged arc-shaped pieces, which are combined to form a hollow wedge-shaped block. A connecting groove is provided around the outer side of the wedge-shaped block, and a connecting ring is sleeved in the connecting groove. An movable gap is opened in the middle of the side of the arc-shaped piece with a larger diameter.

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

[0012] 1. When the support cylinder of this testing device supports the jack, the horizontal position of different support blocks can be adjusted adaptively by adjusting the mechanism according to the orientation angle of the steel strand and the surface unevenness of the concrete beam wall. This ensures that the deviation between the axial direction of the steel strand and the tensioning direction of the jack is less than or equal to 1°, which helps to reduce measurement errors and prevents the equipment from being damaged.

[0013] 2. Four threaded holes are provided, which can be used to install four adjustable support blocks, which are arranged in a ring around the support cylinder, providing relatively stable support;

[0014] 3. The support block can rotate flexibly relative to the lead screw, and the angle can be adjusted flexibly, making it suitable for various concrete beams and walls, and thus having a wider range of applications. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of a prestress detection device for concrete beam anchorage as described in an embodiment of this utility model;

[0016] Figure 2 This is a cross-sectional schematic diagram of the support cylinder described in an embodiment of this utility model;

[0017] Figure 3 This is a schematic diagram of the structure of the working anchor described in an embodiment of this utility model;

[0018] Figure 4 This is a schematic diagram of the structure of the limiting block described in an embodiment of the present utility model;

[0019] Figure 5 This is a schematic diagram of the structure of the anchor clip according to an embodiment of the present utility model;

[0020] Figure 6 This is a schematic diagram of the structure of the anchor plate described in an embodiment of this utility model.

[0021] Explanation of reference numerals in the attached figures:

[0022] 1. Anchor plate; 2. Working anchor; 3. Limiting block; 4. Jack; 5. Stress tester; 6. Tool anchor; 7. Steel strand; 8. Through hole; 9. Anchor clamp; 10. Support cylinder; 11. Connecting pipe; 12. Corrugated pipe; 13. Spiral reinforcement; 14. Grouting port; 31. Limiting groove; 32. Limiting hole; 91. Arc-shaped piece; 92. Connecting ring; 101. Support ring; 102. Support block; 103. Rotary handle; 104. Lead screw. Detailed Implementation

[0023] The embodiments of this utility model will be further described below with reference to the accompanying drawings.

[0024] Example:

[0025] like Figures 1-6 As shown, a prestressing testing device for concrete beam anchorage includes an anchor plate 1, a working anchor 2, a limiting block 3, a jack 4, a stress tester 5, and a tool anchor 6, which are sequentially fitted around the outside of a steel strand 7. The jack 4 is a through-type jack. The working anchor 2 and the tool anchor 6 have the same structure, each having several through holes 8 in the axial direction for the steel strand 7 to pass through. An anchor clamp 9 for the steel strand 7 is provided in the through holes 8. One side of the limiting block 3 has a limiting groove 31 that matches the working anchor 2. The limiting groove 31 has a limiting hole 32 for the anchor clamp 9 corresponding to the through hole 8. The anchor clamp 9 releases the steel strand 7 when it moves away from the anchor plate 1 relative to the working anchor 2 or the tool anchor 6. Line 7, when close to the anchor plate 1, clamps the steel strand 7; the jack 4 is also provided with a support cylinder 10 on one side connected to the limiting block 3. The support cylinder 10 is located outside the working anchor 2 and the limiting block 3. The inner side of the support cylinder 10 close to the anchor plate 1 is provided with a support ring 101. The support cylinder 10 is sleeved on the outside of the jack 4. The support ring 101 abuts against the end of the jack 4; the side of the support cylinder 10 facing the anchor plate 1 is provided with a support block 102. The edge of the support cylinder 10 is provided with multiple threaded holes axially. The adjustment mechanism includes an adjustment handle and a screw 104. The screw 104 passes through the threaded hole. One end is rotatably connected to the support block 102, and the other end is connected to the handle 103.

[0026] Among them, the anchor plate 1 is used to anchor the end of the steel strand 7. On the side away from the jack 4, there is a connecting pipe 11. The connecting pipe 11 is connected to the corrugated pipe 12 embedded in the concrete beam. The inside of the corrugated pipe 12 is the channel through which the steel strand 7 passes. Spiral reinforcement 13 is set on the outside of the connection between the corrugated pipe 12 and the connecting pipe 11 to enhance the tensile strength of the concrete load-bearing component.

[0027] The working principle of the above technical solution is as follows:

[0028] Before testing, jack 4 is hoisted with a chain, and steel strand 7 is passed sequentially through working anchor 2, limiting block 3, jack 4, stress tester 5, and tool anchor 6. With working anchor 2 aligned with the orientation of steel strand 7, the position of each adjusting support block 102 is rotated by the handle 103 so that the support block 102 fits against the concrete beam wall. The hinge and support cylinder 10 work together to support jack 4. During testing, jack 4 moves tool anchor 6 away from anchor plate 1. At this time, the anchor clamp in tool anchor 6 clamps steel strand 7, while the anchor clamp in working anchor 2 is in a loose state. Limiting block 3 limits the loose anchor clamp to prevent the anchor clamp in working anchor 2 from falling off. After jack 4 is unloaded, it moves back. Steel strand 7 at working anchor 2 tends to contract, causing anchor clamp 9 at working anchor 2 to clamp steel strand 7, while the steel clamp in tool anchor 6 is loosened.

[0029] In the above process, the effective prestress is determined by the length deformation of the steel strand 7 and the feedback data detected by the stress tester 5. This part is existing technology.

[0030] In another embodiment, four threaded holes may be provided, arranged in a ring around the support cylinder 10.

[0031] That is, the support block 102 of the support cylinder 10 includes four blocks, which are arranged in a ring around the support cylinder 10, providing relatively stable support.

[0032] In another embodiment, such as Figure 2 As shown, one end of the lead screw 104 that is rotatably connected to the support block 102 is spherical.

[0033] The support block 102 can rotate flexibly relative to the lead screw 104, and the angle can be adjusted flexibly, making it suitable for various concrete beams and walls, and thus having a wider range of applications.

[0034] In another embodiment, such as Figure 5 As shown, the anchor clamp 9 includes two symmetrically arranged arc-shaped pieces 91. The two arc-shaped pieces 91 are combined to form a hollow wedge-shaped block. A connecting groove is provided around the outside of the wedge-shaped block, and a connecting ring 92 is sleeved in the connecting groove. An movable gap is opened in the middle of the side with the larger diameter of the arc-shaped piece 91.

[0035] The assembled wedge blocks all enter the through hole 8 from the side of the working anchor 2 or tool anchor 6 away from the anchor plate 1. The through hole 8 matches the wedge block, and the diameter of the larger side of the arc plate 91 is greater than the diameter of the larger side of the through hole 8. When the steel strand 7 moves toward the side with the smaller diameter of the through hole 8, the wedge block is pulled to clamp the steel strand 7 and prevent the steel strand 7 from moving. Conversely, the steel strand 7 is released.

[0036] In another embodiment, such as Figure 6As shown, the anchor plate 1 is provided with a grouting port 14 that connects the connecting pipe 11 and the corrugated pipe 12, which facilitates grouting after inspection.

[0037] The above-described embodiments merely illustrate specific implementations of this utility model, and while the descriptions are detailed, they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these modifications and improvements all fall within the protection scope of this utility model.

Claims

1. A device for detecting prestress under concrete beam anchorage, characterized in that, The system includes an anchor plate, a working anchor, a limiting block, a jack, a stress tester, and a tool anchor, which are sequentially fitted around the outside of the steel strand. The working anchor and the tool anchor have the same structure and are provided with several through holes in the axial direction for the steel strand to pass through. Anchor clamps for the steel strand are provided in the through holes. One side of the limiting block is provided with a limiting groove that matches the working anchor. The limiting groove is provided with a limiting hole for the anchor clamp at the corresponding through hole. A support cylinder is also provided on the side of the jack that connects to the limiting block. The support cylinder is located outside the working anchor and the limiting block. A support block is provided on the side of the support cylinder facing the anchor plate. An adjustment mechanism for axially adjusting the support block is provided on the support cylinder.

2. The prestress detection device under the anchorage of a concrete beam according to claim 1, characterized in that, The edge of the support cylinder is provided with a threaded hole. The adjustment mechanism includes an adjustment handle and a lead screw. The lead screw passes through the threaded hole, with one end rotatably connected to the support block and the other end connected to the handle.

3. The prestress detection device under the anchorage of a concrete beam according to claim 2, characterized in that, The inner side of the support cylinder near the anchor plate is provided with a support ring. The support cylinder is sleeved on the outside of the jack, and the support ring abuts against the end of the jack.

4. The prestress detection device for concrete beam anchorage according to claim 3, characterized in that, The threaded holes include four, arranged in a ring around the support cylinder.

5. The prestress detection device for concrete beam anchorage according to claim 4, characterized in that, One end of the lead screw rotatably connects to the support block and is spherical.

6. The prestress detection device for concrete beam anchorage according to claim 1, characterized in that, The anchor clip includes two symmetrically arranged arc-shaped pieces, which are combined to form a hollow wedge-shaped block. A connecting groove is provided around the outer side of the wedge-shaped block, and a connecting ring is fitted inside the connecting groove. An movable gap is provided in the middle of the side of the arc-shaped piece with the larger diameter.

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