Cable force detection device for unbonded steel strand
By designing a bondless steel strand thread force detection device, using jacks and video acquisition devices, the relative displacement and repeated bite problems during the detection of cable force in the prior art are solved, and a cable force detection with higher accuracy and reliability is achieved.
Patent Information
- Application Number
- CN202421479967.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-25
- Publication Date
- 2025-05-06
- Estimated Expiration
- 2034-06-25
AI Technical Summary
When detecting the cable force of the unbonded steel strand, the prior art is prone to relative deformation and repeated biting due to disturbance of the position of the clip, which affects the anchor reliability and is difficult to accurately judge the timing of the clip breaking away from the anchor.
A non-bonded steel strand force detection device is designed, including a limiting device, a jack, a video acquisition device and a display device. The steel stranded wire is slowly pulled out by the jack, and the video acquisition device collects clip movement video. The display device displays clip position information, clearly judges the moment when the clip leaves the anchor, and obtains the true cable force value of the steel stranded wire through the jack force value.
The accuracy of steel strand detection is improved, and the relative displacement and repeated jointing between the steel strand and the clip during the inspection process is avoided, ensuring the accuracy and reliability of the detection results.
Smart Images
Figure CN222837713U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a non-bonded steel strand detection technology, in particular to a non-bonded steel strand tension detection device. Background Art
[0002] Unbonded steel strands have the advantages of being detectable, compensable, and replaceable, so they are increasingly being used in bridge engineering. During the operation of the bridge, the cable force loss may change with the effects of the environment and loads. How to accurately obtain the cable force of the steel strand is one of the key issues in the operation of unbonded steel strands in bridge engineering.
[0003] In the prior art, the steel strand may be disturbed in the position of the clip during the pull-out test, causing relative deformation between the clip and the steel strand, resulting in repeated engagement between the clip and the steel strand, affecting the long-term anchoring reliability. In addition, when the steel strand is tested by the pulling method, it is generally difficult to determine the moment when the steel strand clip and the anchor are disengaged, and it is impossible to accurately obtain the tension state of the steel strand. Utility Model Content
[0004] Purpose of the utility model: In view of the above problems, the purpose of the utility model is to provide a tension detection device for unbonded steel strands.
[0005] Technical solution: The utility model discloses a tension detection device for an unbonded steel strand, comprising a limit device, a jack, a video acquisition device and a display device. A through hole is arranged on the limit device, one end of the steel strand is passed through the through hole and fixed on the jack, and the other end of the steel strand is fixed on the anchor by a clip. A notch is arranged at the lower end of the limit device, and the through hole is above the notch. A scale line is arranged on one side of the inner wall of the notch, and a video acquisition device is installed on the other side of the inner wall of the notch. The video acquisition device is connected to the display device via a transmission line. The video acquisition device is used to acquire the motion video of the clip, and the display device is used to display the position information of the clip when it moves.
[0006] Furthermore, the height of the notch is greater than the length of the clip.
[0007] Furthermore, the jack is a single steel strand jack.
[0008] Furthermore, the shape of the notch is an arch.
[0009] Furthermore, the scale line is arranged relative to the video acquisition device.
[0010] Furthermore, the video acquisition device is a camera.
[0011] Beneficial effects: Compared with the prior art, the utility model has the following significant advantages:
[0012] The utility model is suitable for the tension detection process of unbonded pre-tensioned steel strands. The steel strands are slowly pulled out by a jack. The moment when the clips are separated from the anchor can be clearly obtained through the relative position relationship between the clips and the scale lines in the display device. The real cable tension value of the steel strand is obtained through the force value of the jack, which improves the accuracy of steel strand detection and can avoid relative displacement between the steel strand and the clip during the detection process, and also prevents repeated engagement of the steel strand and the clip. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] Figure 1 It is a structural schematic diagram of a tension detection device for unbonded steel strands;
[0014] Figure 2 This is the working principle diagram of the limit device;
[0015] Figure 3 It is a schematic diagram of the structure of the limit device. DETAILED DESCRIPTION
[0016] In order to make the objectives, technical solutions and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments.
[0017] The present embodiment describes a non-bonded steel strand tension detection device, such as Figure 1-3 As shown, it includes a limit device 4, a jack 7, a video acquisition device 4-4 and a display device 6. A through hole 4-2 is set on the limit device 4, and the solid part next to the through hole 4-2 is a support pad 4-1. One end of the steel strand 3 passes through the through hole 4-2 and is fixed on the jack 7, and the other end of the steel strand 3 is fixed on the anchor 1 through the clip 2. A notch is set at the lower end of the limit device 4, and the through hole 4-2 is above the notch. A scale line 4-3 is set on one side of the inner wall of the notch. A video acquisition device 4-4 is installed on the other side of the inner wall of the notch. The video acquisition device 4-4 is connected to the display device 6 through a transmission line 5. The video acquisition device 4-4 is used to collect the motion video of the clip 2, and the display device 6 is used to display the position information of the clip 2 when it moves. In order not to limit the up and down movement of the clip 2, the notch crosses the clip 2 of the steel strand 3 to be detected, and the height of the notch is greater than the length of the clip 2. The scale line 4 - 3 is arranged opposite to the video acquisition device 4 - 4 , and the video acquisition device 4 - 4 is a camera.
[0018] In one example, the jack 7 is a single strand jack.
[0019] In one example, the shape of the notch is an arch, or a cube or a cylinder.
[0020] In one example, the display device 6 may be an LED display screen.
[0021] When the unbonded steel strand tension detection device in this embodiment is used to detect the tension of the steel strand 3, the limit device 4 needs to be fixed on the anchor 1, the notch and the through hole 4-2 are facing the steel strand 3, the anchor 1 is fixed on the anchor pad 8, and the concrete 9 is below the anchor pad 8. The underground part of the steel strand 3 is placed in the pre-tensioning conduit 10, and the jack 7 is supported on the top of the limit device 4 to pull the steel strand 3. The movable end of the steel strand 3 passes through the through hole 4-2 and is fixed to the single steel strand jack. The steel strand 3 is pulled by the single steel strand jack. When the clip 2 of the steel strand 3 is separated from the anchor 1, the tension corresponding to the jack 7 is the detection value of the tension of the steel strand 3.
[0022] Before the cable tension test of the steel strand 3, the initial position of the top of the clip 2 on the scale line 4-3 is recorded first. During the cable tension test of the steel strand 3, the steel strand 3 is slowly pulled by the jack 7. The video acquisition device 4-4 synchronously sends the video of the upward movement of the clip 2 collected through the transmission line 5 to the display device 6. The relative position relationship between the top of the clip 2 and the scale line 4-3 can be obtained at all times through the screen of the display device 6 to determine whether the clip 2 is separated from the anchor 1. When the current position height of the top of the clip 2 is more than 2mm relative to the initial position height, the oil supply of the jack 7 is stopped. At this time, the force value of the jack 7 is the cable tension test value of the steel strand 3.
Claims
1. A device for detecting tension of unbonded steel strands, characterized in that: It includes a limit device, a jack, a video acquisition device and a display device. A through hole is arranged on the limit device. One end of the steel strand passes through the through hole and is fixed on the jack. The other end of the steel strand is fixed on the anchor through a clip. A slot is arranged at the lower end of the limit device, and the through hole is above the slot. A scale line is arranged on one side of the inner wall of the slot. A video acquisition device is installed on the other side of the inner wall of the slot. The video acquisition device is connected to the display device through a transmission line. The video acquisition device is used to acquire the movement video of the clip. The display device is used to display the position information of the clip when it moves.
2. The unbonded steel strand tension detection device according to claim 1, characterized in that: The height of the notch is greater than the length of the clip.
3. The unbonded steel strand tension detection device according to claim 1, characterized in that: The jack is a single steel strand jack.
4. The unbonded steel strand tension detection device according to claim 1, characterized in that: The shape of the notch is arched.
5. The unbonded steel strand tension detection device according to claim 1, characterized in that: The scale lines are arranged relative to the video acquisition device.
6. The unbonded steel strand tension detection device according to claim 1, characterized in that: The video acquisition device is a camera.