System for detecting effective prestress of pre-stressed anchor cable in working state

Abstract

The utility model discloses a system for detecting effective prestress of a pre-stressed anchor cable in a working state, which comprises an anchor cable anchored in a side slope, and an anchor backing plate, an anchorage device, an anchor withdrawing device, a pressure sensor and a jack which are arranged on an exposed section of the anchor cable, the anchor backing plate is arranged close to the side slope, the anchorage device is arranged close to the anchor backing plate, and the anchor withdrawing device is arranged close to the anchorage device. A working clamping piece is arranged in the end, close to the anchor withdrawing device, of the anchorage device, the pressure sensor is located between the anchor withdrawing device and the jack, a gasket is arranged between the pressure sensor and the jack, and a displacement sensor used for measuring the elongation of the anchor cable is arranged in the jack. The pre-stressed anchor cable tensioning device is reasonable in structural design, the anchor withdrawing device is arranged between the anchorage device and the pressure sensor, and the displacement sensor is arranged in the jack, so that effective pre-stress detection of the pre-stressed anchor cable in a working state can be realized, and problems in a pre-stressed anchor cable tensioning process can be avoided to a certain extent; and meanwhile, a basis is provided for anchor cable quality inspection and project acceptance.

Description

Technical Field

[0001] The utility model belongs to the technical field of building construction, and in particular relates to a detection system for effective prestress in a prestressed anchor cable working state. Background Art

[0002] Prestressed anchor cables are widely used in foundation pit support and slope reinforcement projects. By applying prestress, they increase soil shear strength and reduce deformation. Currently, prestressed anchor cable quality testing focuses on the following aspects: cable length, anchor section length, free section length, construction defects, and effective prestress. Factors such as prestressing construction techniques, pipeline friction, cable stress relaxation, and anchor deformation can cause prestress loss in anchor cables, seriously impacting the safety and proper operation of the structure. Therefore, it is necessary to test the effective prestress in prestressed anchor cables during operation to ensure their safety and reliability. Effective prestress refers to the stress value achieved at a certain stage after the design tensioning force of the prestressed anchor cable is gradually reduced during the tensioning process and subsequent periods due to various factors. Currently, the main methods for testing the effective prestress in prestressed anchor cables during construction and the prestress in operation (collectively referred to as effective prestress) include construction records and quality assessments during prestressing of prestressed anchor cables. Anchor cable tensioning employs a dual-control method: tensioning force control is the primary focus, while elongation value verification is employed. This control method can avoid problems during the tensioning of prestressed anchor cables to a certain extent, and also provide a basis for anchor cable quality inspection and project acceptance.

[0003] Currently, the detection of effective prestress in prestressed anchor cables is not systematic enough. It is only controlled at various stages during construction and use, making it difficult to accurately detect the effective prestress in the anchor cables and thus determine the stability of the slope. Therefore, a low-cost, practical, and non-destructive detection system for effective prestress in anchor cables is needed. Utility Model Content

[0004] The technical problem to be solved by the present invention is to provide a detection system for the effective prestress of the prestressed anchor cable in the working state in response to the deficiencies in the above-mentioned prior art. The system has a reasonable structural design. By arranging an anchor remover between the anchor and the pressure sensor and arranging a displacement sensor in the jack, the effective prestress of the prestressed anchor cable in the working state can be detected, which can avoid problems in the tensioning process of the prestressed anchor cable to a certain extent, and also provide a basis for anchor cable quality inspection and project acceptance.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is: a detection system for the effective prestress of a prestressed anchor cable in a working state, characterized by comprising an anchor cable anchored in a slope and an anchor pad, an anchor, an anchor withdrawer, a pressure sensor and a jack installed on an exposed section of the anchor cable;

[0006] The anchor plate is arranged close to the slope, the anchor is arranged close to the anchor plate, the anchor remover is arranged close to the anchor, a working clip is built into the end of the anchor close to the anchor remover, the pressure sensor is located between the anchor remover and the jack, a gasket is provided between the pressure sensor and the jack, and the jack is equipped with a displacement sensor for measuring the elongation of the anchor cable.

[0007] The above-mentioned system for detecting effective prestress of a prestressed anchor cable in a working state is characterized in that the gasket is a square gasket, and a through hole for the anchor cable to pass through is opened in the middle of the gasket.

[0008] The above-mentioned system for detecting effective prestress of a prestressed anchor cable in a working state is characterized in that the jack is a front-clip jack with a tool clip built into the front end.

[0009] The above-mentioned system for detecting effective prestress of a prestressed anchor cable in a working state is characterized in that the displacement sensor is located in the middle of the jack.

[0010] The above-mentioned system for detecting effective prestress of a prestressed anchor cable in a working state is characterized in that the segment of the anchor cable anchored in the slope includes an anchoring segment and a free segment, the free segment is located between the anchoring segment and the exposed segment, and a sleeve is provided on the free segment.

[0011] The above-mentioned system for detecting effective prestress of a prestressed anchor cable in a working state is characterized in that a hydraulic oil pump is connected to the jack.

[0012] The above-mentioned system for detecting effective prestress of a prestressed anchor cable in a working state is characterized in that both the pressure sensor and the displacement sensor are connected to a data acquisition module.

[0013] The above-mentioned system for detecting effective prestress of a prestressed anchor cable in a working state is characterized in that a hole matching the working clip is provided on one end of the anchor withdrawer close to the anchor.

[0014] Compared with the prior art, the present invention has the following advantages:

[0015] 1. The utility model sets an anchor puller between the anchor and the pressure sensor, which can support the anchor through the anchor puller. After the anchor cable is unlocked, the anchor puller can provide a certain space for the working clip, so that the anchor cable has space to extend, which is convenient for the pressure sensor to detect the prestress of the prestressed anchor cable in the working state.

[0016] 2. The utility model measures the elongation of the anchor cable through the displacement sensor built into the jack, which is convenient for the staff to use the double-control operation method of anchor cable tensioning, which mainly controls the tensioning force and verifies the elongation value, when performing prestressed anchor cable tensioning. This can avoid problems in the process of prestressed anchor cable tensioning to a certain extent, and also provide a basis for anchor cable quality inspection and project acceptance.

[0017] To sum up, the structural design of the utility model is reasonable. By arranging an anchor withdrawer between the anchor and the pressure sensor and arranging a displacement sensor in the jack, it is possible to detect the effective prestress of the prestressed anchor cable in the working state, which can avoid problems in the tensioning process of the prestressed anchor cable to a certain extent, and also provide a basis for anchor cable quality inspection and project acceptance.

[0018] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural diagram of the present utility model.

[0020] Figure 2 This is a structural diagram of the utility model anchor cable anchored in the slope.

[0021] Description of the accompanying drawings:

[0022] 1—anchor cable; 1-1—exposed section; 1-2—anchoring section;

[0023] 1-3—free section; 2—casing; 3—anchor plate;

[0024] 4—anchor; 5—anchor release device; 6—pressure sensor;

[0025] 7—Jack; 8—Displacement sensor; 9—Working clamp;

[0026] 10—gasket; 11—tool clip; 12—hydraulic oil pump;

[0027] 13—Data acquisition module. DETAILED DESCRIPTION

[0028] like Figure 1 and Figure 2 As shown, the utility model includes an anchor cable 1 anchored in the slope, and an anchor plate 3, an anchor 4, an anchor remover 5, a pressure sensor 6 and a jack 7 installed on the exposed section 1-1 of the anchor cable 1;

[0029] The anchor plate 3 is arranged close to the slope, the anchor 4 is arranged close to the anchor plate 3, the anchor remover 5 is arranged close to the anchor 4, and a working clamp 9 is built into the end of the anchor 4 close to the anchor remover 5. The pressure sensor 6 is located between the anchor remover 5 and the jack 7. A gasket 10 is provided between the pressure sensor 6 and the jack 7. The jack 7 has a built-in displacement sensor 8 for measuring the elongation of the anchor cable 1.

[0030] In actual use, by setting the anchor remover 5 between the anchor 4 and the pressure sensor 6, the anchor 4 can be supported by the anchor remover 5, and after the anchor cable is unlocked, the anchor remover 5 can provide a certain space for the working clip 9, so that the anchor cable has space to extend, which is convenient for the pressure sensor 6 to realize the detection of prestress in the working state of the prestressed anchor cable.

[0031] It should be noted that the elongation of the anchor cable 1 is measured by the displacement sensor 8 built into the jack 7, which makes it convenient for the staff to use a dual-control operation method of anchor cable tensioning, which mainly controls the tensioning force and verifies the elongation value, when performing prestressed anchor cable tensioning. This can avoid problems in the prestressed anchor cable tensioning process to a certain extent, and also provide a basis for anchor cable quality inspection and project acceptance.

[0032] In this embodiment, the gasket 10 is a square gasket, and a through hole for the anchor cable 1 to pass through is opened in the middle of the gasket 10 .

[0033] In actual use, the gasket 10 is a Q355B steel plate with a size of 150 mm × 150 mm × 15 mm and a hole with a diameter of 50 mm in the middle for the passage of the anchor cable.

[0034] In this embodiment, the jack 7 is a front-clip jack with a tool clip 11 built into the front end.

[0035] In this embodiment, the displacement sensor 8 is located in the middle of the jack 7 .

[0036] like Figure 2 As shown, in this embodiment, the segment of the anchor cable anchored in the slope includes an anchoring segment 1-2 and a free segment 1-3. The free segment 1-3 is located between the anchoring segment 1-2 and the exposed segment 1-1. A sleeve 2 is provided on the free segment 1-3.

[0037] During actual use, the jack 7 fixes the extended anchor cable 1 and provides tension through an automatic hydraulic oil pump when working. A displacement sensor 8 is built-in in the middle of the jack 7. When the tensioning force of the exposed section of the anchor cable is greater than the tensioning force of the free section of the anchor cable, the displacement sensor 8 collects the displacement elongation of the anchor cable 1 in real time. At this time, the elongation of the anchor cable of the exposed section is the same as that of the free section, that is, the prestressing is replenished to the design value, achieving the purpose of effective prestressing detection and prestressing; if the tensioning force of the exposed section of the anchor cable reaches the prestressing design value without the displacement elongation of the anchor cable, that is, the tension of the tensioning jack reaches the design value and the data detected by the displacement sensor 8 is zero, it proves that the effective prestress of this single steel strand in the anchored state is greater than the design value, there is no stress loss and no replenishing operation is required.

[0038] In this embodiment, a hydraulic oil pump 12 is connected to the jack 7 .

[0039] During actual use, the hydraulic oil pump 12 is a matching automatic hydraulic oil pump for the jack 7 .

[0040] In this embodiment, the pressure sensor 6 and the displacement sensor 8 are both connected to the data acquisition module 13 .

[0041] In actual use, the pressure sensor 6 is a strain gauge pressure sensor. The data of the pressure sensor 6 and the displacement sensor 8 are collected by the data acquisition module 13 and transmitted to the computer, and the real-time pressure measured by the pressure sensor 6 and the anchor cable elongation measured by the displacement sensor 8 are displayed on the computer display screen.

[0042] In this embodiment, a hole matching the working clip 9 is formed on one end of the anchor remover 5 close to the anchor 4 .

[0043] In specific implementation, the anchor remover 5 is a cylindrical sleeve with an outer diameter of 100 mm and an inner diameter of 30 mm. The anchor remover 5 is made of Q355B steel, and the working clip 9 can enter into the anchor remover 5 .

[0044] When the utility model is actually used, when the jack 7 is pressurized by the hydraulic oil pump 12, the tool clip 11 in the jack 7 clamps the anchor cable 1, and the anchor cable 1 is tensioned as the oil cylinder of the jack 7 extends; the hydraulic oil pump 12 can achieve uniform loading, and when the tensioning force approaches the designed prestress of the anchor cable, the loading speed is slowed down to improve the test accuracy while ensuring the safety of the tensioning process;

[0045] During the tensioning process, the pressure sensor 6 measures the tensioning force of the anchor cable 1, and the displacement sensor 8 measures the extension of the oil cylinder of the jack 7 (i.e. the elongation of the anchor cable during the detection process);

[0046] In the initial state, the tension of the exposed section 1-1 of the anchor cable 1 is zero, and the anchor cable 1 works normally. At this time, the tension of the free section 1-3 is an effective prestress and is not zero;

[0047] The exposed section 1-1 is tensioned, and the tensioning force of the exposed section 1-1 gradually increases. When the tensioning force of the exposed section 1-1 is less than that of the free section 1-3, the working clamp 9 between the exposed section 1-1 and the free section 1-3 is still in a locked state.

[0048] When the tension of the exposed section 1-1 is greater than that of the free section 1-3, the working clamp 9 between the exposed section 1-1 and the free section 1-3 is disengaged, the constraints of the two sections are released, and the two sections are tensioned together. When the tension continues to increase, the elongation of the anchor cables in the two sections is the same.

[0049] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any way. Any simple modification, change and equivalent structural change made to the above embodiment based on the technical essence of the present invention shall still fall within the scope of protection of the technical solution of the present invention.

Claims

1. A system for detecting effective prestress of a prestressed anchor cable in working condition, characterized by: It comprises an anchor cable (1) anchored in a slope, an anchor pad (3) installed on an exposed section (1-1) of the anchor cable (1), an anchoring device (4), an anchor remover (5), a pressure sensor (6) and a jack (7); The anchor plate (3) is arranged close to the slope, the anchor (4) is arranged close to the anchor plate (3), the anchor remover (5) is arranged close to the anchor (4), a working clamp (9) is built into one end of the anchor (4) close to the anchor remover (5), the pressure sensor (6) is located between the anchor remover (5) and the jack (7), a gasket (10) is provided between the pressure sensor (6) and the jack (7), and the jack (7) is built into a displacement sensor (8) for measuring the elongation of the anchor cable (1); The jack (7) is a front-clip jack with a tool clip (11) built into the front end; The displacement sensor (8) is located in the middle of the jack (7); The segment of the anchor cable anchored in the slope comprises an anchoring segment (1-2) and a free segment (1-3); the free segment (1-3) is located between the anchoring segment (1-2) and the exposed segment (1-1); and a sleeve (2) is sleeved on the free segment (1-3); When the tension of the exposed anchor cable is greater than the tension of the free anchor cable, the displacement sensor (8) collects the displacement elongation of the anchor cable (1) in real time. At this time, the elongation of the exposed anchor cable is the same as that of the free anchor cable, which means that the prestressing is replenished to the design value, achieving the purpose of effective prestressing detection and prestressing. If the tension of the exposed anchor cable reaches the prestressing design value without the displacement elongation of the anchor cable, that is, the tension of the tensioning jack reaches the design value and the data detected by the displacement sensor (8) is zero, it proves that the effective prestress of this single steel strand in the anchoring state is greater than the design value, there is no stress loss and no replenishing operation is required.

2. A system for detecting effective prestress of a prestressed anchor cable in working condition according to claim 1, characterized in that: The gasket (10) is a square gasket, and a through hole for the anchor cable (1) to pass through is provided in the middle of the gasket (10).

3. A system for detecting effective prestress of a prestressed anchor cable in working condition according to claim 1, characterized in that: The jack (7) is connected to a hydraulic oil pump (12).

4. A system for detecting effective prestress of a prestressed anchor cable in working condition according to claim 1, characterized in that: The pressure sensor (6) and the displacement sensor (8) are both connected to the data acquisition module (13).

5. A system for detecting effective prestress of a prestressed anchor cable in working condition according to claim 1, characterized in that: The anchor remover (5) is provided with a hole at one end close to the anchor (4) that matches the working clamp (9).

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