Device and method for automatically monitoring elongation of prestressed tendon

Abstract

The invention discloses a prestressed tendon elongation automatic monitoring device and a monitoring method thereof. The prestressed tendon elongation automatic monitoring device comprises a lantern ring and a mounting frame. The device has the beneficial effects that the sleeve capable of moving along with extension of the prestressed tendons and the wireless remote transmission camera used for shooting the moving distance are adopted, when the device is used, a worker can sleeve the sleeve ring to the outer side of the jack, the jack is clamped through the clamping ring, then one prestressed tendon penetrates through the sleeve, and the sleeve is connected with the wireless remote transmission camera through the wireless remote transmission camera; the prestressed tendon can be fixedly connected with the sleeve by rotating the first cleat bolt to abut against and fix the prestressed tendon, in the working process of the jack, the prestressed tendon is stretched to drive the sleeve to move, the sleeve drives the movable frame to move, the movable frame moves along the ruler, and the wireless remote transmission camera transmits ruler scale information shielded by the movable frame to a mobile phone terminal. A worker can monitor the elongation of the prestressed tendon in real time through the mobile phone, so that the problem of anti-arching caused by over-pulling of the prestressed tendon is avoided, and the risks of anti-arching and tendon breaking are reduced.

Description

Technical Field

[0001] The invention relates to the technical field of bridge prestressed construction, and in particular to a prestressed tendon elongation automatic monitoring device and a monitoring method thereof. Background Art

[0002] As a building structure technology that is being vigorously promoted, prestressed technology is currently mainly used in bridge construction. With the increasing demand for large-span use functions in public buildings, large-span bonded prestressed concrete has become a trend in order to meet the needs of use functions.

[0003] During the post-tensioning prestressed construction process, the prestressed tendons are stretched by jacks. During the stretching process, the prestressed tendons are over-stretched, resulting in excessive stress in the prestressed tendons and arching, which affects the structure and overall structure of the prestressed tendons and poses great safety and structural risks. Since the stress of the prestressed tendons is roughly proportional to its stretched length, the stress size can be judged by monitoring the stretched length of the prestressed tendons. After searching, it was found that traditional jacks cannot accurately monitor the stretched length of the prestressed tendons, nor can they monitor the stress of one or more prestressed tendons. Further improvements can be made to reduce the arching phenomenon of the prestressed tendons and improve the stability and efficiency of construction.

[0004] Currently, no effective solution has been proposed for the problems in the related technologies. Summary of the invention

[0005] 1. Technical issues to be resolved

[0006] In view of the shortcomings of the prior art, the present invention provides an automatic monitoring device for the elongation of prestressed tendons and a monitoring method thereof, which have the advantages of convenient and safe monitoring, improved construction efficiency, flexible adjustment and use, simple structure, low cost, and easy installation and disassembly, thereby solving the problems in the above-mentioned background technology.

[0007] (II) Technical solution

[0008] In order to achieve the advantages of convenient and safe monitoring, improved construction efficiency, flexible adjustment and use, simple structure, low cost and convenient installation and disassembly, the specific technical scheme adopted by the present invention is as follows:

[0009] The cam is an assembly made of a plurality of threaded holes, the plurality of first and second screw threads are connected to the plurality of locking plates, the plurality of first and second screw threads are connected to the plurality of locking plates, the plurality of first and second screw threads are connected to the plurality of locking plates.

[0010] Furthermore, a guide hole is formed through the surface of the movable frame, a first guide rod is fixedly connected between the first end plate and the second end plate, and the first guide rod passes through the guide hole and is slidably connected to the guide hole.

[0011] Furthermore, a second handle screw is threadedly connected to the surface of the second end plate, and one end of the second handle screw is rotatably connected to a mounting plate via a second rotating connection seat, and a contact switch is fixedly installed on the other side surface of the mounting plate, a battery box is fixedly installed on the top surface of one end of the mounting frame, and a sound and light alarm is fixedly installed on the top surface of the battery box, and the output end of the contact switch is electrically connected to the input end of the sound and light alarm.

[0012] Furthermore, a second guide rod is fixedly mounted on one side surface of the mounting plate, and the second guide rod penetrates the second end plate and is slidably connected to the second end plate.

[0013] Furthermore, the slots are arranged in multiple groups at equal angles along the central axis of the ring, and threaded holes are opened through the surface of the slots, a fixing hole is opened at one end of the mounting frame corresponding to the position of the threaded hole, and a second clevis bolt is threadedly connected inside the threaded hole, and the second clevis bolt passes through the threaded hole and the fixing hole.

[0014] Furthermore, ear plates are integrally connected to both ends of the collar, and the ear plates are fixedly connected by fixing bolts.

[0015] Furthermore, the clamp ring is an annular structure, and the inner surface of the clamp ring is roughened, and the inner diameter of the clamp ring is equal to the outer diameter of the jack.

[0016] Furthermore, a storage battery is installed inside the battery box, and the storage battery is electrically connected to the sound and light alarm, the contact switch and the wireless remote transmission camera through electrical connecting wires.

[0017] Furthermore, the sleeve and the mounting frame are arranged in parallel, and the inner diameter of the sleeve is larger than the outer diameter of the prestressed tendon.

[0018] A prestressed tendon elongation automatic monitoring device and a monitoring method thereof, comprising a prestressed tendon elongation automatic monitoring device, the specific method comprising the following steps:

[0019] S1. Installation steps: Sleeve the collar onto the outside of the jack, then fix the ear plate with the fixing bolts to close the collar, then turn the first handle screw to drive the clamp ring to move inward and clamp the jack, then sleeve the sleeve onto the outside of the prestressed tendon, then insert one end of the mounting frame into the slot, fix the mounting frame with the second clevis bolt, then slide the mobile frame to the left edge of the mobile frame and align it with the zero scale line of the ruler, turn the first clevis bolt, tighten the prestressed tendon, and the installation is complete.

[0020] S2. Debugging steps: Turn the second handle screw to push the contact switch to the scale corresponding to the maximum elongation of the prestressed tendon. Then, test the contact switch to observe whether the sound and light alarm sounds. If it sounds, it means it is working normally. You can turn on the wireless remote transmission camera and connect it to the mobile phone. After the connection, observe whether the image is clear. If it is clear, you can carry out monitoring work.

[0021] S3. Monitoring steps: The jack stretches the prestressed tendon, and one end of the prestressed tendon moves outward, driving the sleeve and the mobile frame to move. The scale mark corresponding to the left edge of the mobile frame is transmitted to the staff of the mobile terminal in real time by the wireless remote transmission camera, and the monitoring is completed.

[0022] (III) Beneficial effects

[0023] Compared with the prior art, the present invention provides a prestressed tendon elongation automatic monitoring device and a monitoring method thereof, which have the following beneficial effects:

[0024] (1) The present invention adopts a sleeve that can move with the elongation of the prestressed tendons, and a wireless remote transmission camera for photographing the moving distance. When the present invention is in use, the staff can put the sleeve ring on the outside of the jack, tighten the jack by the clamp ring, and then pass one of the prestressed tendons through the sleeve. The prestressed tendons can be fixedly connected to the sleeve by rotating the first clevis bolt to tighten and fix the prestressed tendons. During the operation of the jack, the prestressed tendons are stretched, driving the sleeve to move, and the sleeve drives the mobile frame to move. The mobile frame moves along the ruler, and the wireless remote transmission camera transmits the ruler scale information blocked by the mobile frame to the mobile phone terminal. The staff can monitor the elongation of the prestressed tendons in real time through the mobile phone, thereby avoiding the problem of arching caused by over-tensioning of the prestressed tendons, reducing the risk of arching and broken tendons, and thus improving construction efficiency.

[0025] (2) The present invention adopts a contact switch and an audible and visual alarm. After fixing the sleeve, the staff can rotate the second handle screw, and the second handle screw drives the mounting plate to move. The staff can move the mounting plate to the scale position corresponding to the maximum elongation of the prestressed tendon according to the scale information on the ruler. When the prestressed tendon is extended to the maximum elongation, the moving frame contacts the contact switch, and the contact switch triggers the audible and visual alarm to sound an on-site alarm, reminding the staff to close the jack, thereby improving the safety of use.

[0026] (3) The present invention adopts a detachable mounting frame, which is inserted into the slot and fixed by a second clevis bolt passing through the bolt hole and the fixing hole. The staff can install multiple sets of mounting frames at one end of the ring as needed, so as to monitor the elongation of multiple prestressed tendons, improve the comprehensiveness of monitoring, and improve the flexibility of use. At the same time, when the device is not in use, the mounting frame can be removed for convenient classification and storage. The assembly is flexible and convenient, which further improves the convenience of use. At the same time, the present invention has a simple structure, and the manufacturing and use costs are very low, which is suitable for large-scale promotion and use. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0028] Figure 1 is a structural schematic diagram of a prestressed tendon elongation automatic monitoring device according to an embodiment of the present invention;

[0029] Figure 2 is a front view of a device for automatically monitoring the elongation of a prestressed tendon according to an embodiment of the present invention;

[0030] Figure 3 is a schematic structural diagram of a mounting frame according to an embodiment of the present invention;

[0031] Figure 4 is a schematic structural diagram of a collar according to an embodiment of the present invention;

[0032] Figure 5 is an enlarged view of node A of a prestressed tendon elongation automatic monitoring device according to an embodiment of the present invention;

[0033] Figure 6 is an enlarged view of node B of a prestressed tendon elongation automatic monitoring device according to an embodiment of the present invention;

[0034] Figure 7is a schematic diagram of installing a contact switch according to an embodiment of the present invention;

[0035] Figure 8 2 is a schematic diagram of sleeve installation according to an embodiment of the present invention.

[0036] In the figure:

[0037] 1. Ring; 2. Slot; 3. Clamp ring; 4. First handle screw; 5. First rotating connection seat; 6. Mounting frame; 7. First end plate; 8. Second end plate; 9. Ruler; 10. Moving frame; 11. Sleeve; 12. First horn bolt; 13. First guide rod; 14. Mounting plate; 15. Second handle screw; 16. Second guide rod; 17. Battery box; 18. Sound and light alarm; 19. Second horn bolt; 20. Threaded hole; 21. Ear plate; 22. Fixing bolt; 23. Fixing hole; 24. Wireless remote transmission camera; 25. Cantilever frame; 26. Contact switch; 27. Second rotating connection seat; 28. Rod hole; 29. ​​Guide hole. DETAILED DESCRIPTION

[0038] To further illustrate each embodiment, the present invention provides drawings, which are part of the disclosure of the present invention and are mainly used to illustrate the embodiments and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these contents, ordinary technicians in the field should be able to understand other possible implementations and advantages of the present invention. The components in the figures are not drawn to scale, and similar component symbols are generally used to represent similar components.

[0039] According to an embodiment of the present invention, a device and method for automatically monitoring the elongation of a prestressed tendon are provided.

[0040] The present invention will now be further described with reference to the accompanying drawings and specific embodiments. Figure 1-8As shown, according to an embodiment of the present invention, an automatic monitoring device for the elongation of a prestressed tendon comprises a collar 1 and a mounting frame 6. The collar 1 is sleeved on the outside of the jack. The collar 1 is composed of two parts spliced ​​together, which is convenient for installation on the outside of the jack. A first handle screw 4 is threadedly connected to the surface of the collar 1, and the other end of the first handle screw 4 is rotatably connected to a clamp ring 3 through a first rotating connection seat 5. The clamp ring 3 is tightly fixed to the outer wall of the jack. A slot 2 is opened on the surface of one end of the collar 1, and one end of the mounting frame 6 is fixedly inserted in the slot. 2, the vertical cross-sectional dimension of the slot 2 is the same as that of the mounting frame 6, which is convenient for the stable insertion of the mounting frame 6, and the other end of the mounting frame 6 is fixedly installed with the first end plate 7 and the second end plate 8, and a moving frame 10 is arranged between the first end plate 7 and the second end plate 8, and the other end of the moving frame 10 is fixedly connected with a sleeve 11, and the surface of the sleeve 11 is threadedly connected with a first clevis bolt 12, and the first end plate 7 and the second end plate 8 are fixedly connected with a ruler 9, and the scale is printed on the surface of the ruler 9, and the surface of the moving frame 10 is fixedly connected with a ruler 9. A rod hole 28 is opened through the surface, and the ruler 9 passes through the rod hole 28 and slides against the rod hole 28. A wireless remote transmission camera 24 is fixedly installed on the front elevation of the mobile frame 10 through the cantilever frame 25, and the wireless remote transmission camera 24 is wirelessly interconnected with a mobile phone. It is a common device and can be purchased on the market. When the present invention is in use, the staff can sleeve the ring 1 on the outside of the jack and tighten the jack through the clamp ring 3. Then, one of the prestressed tendons passes through the sleeve 11, and the prestressed tendon is tightened and fixed by rotating the first clevis bolt 12, so that the prestressed tendon can be fixedly connected with the sleeve 11. During the operation of the jack, the prestressed tendon stretches, drives the sleeve 11 to move, and the sleeve 11 drives the mobile frame 10 to move. The mobile frame 10 moves along the ruler 9, and the wireless remote transmission camera 24 transmits the scale information of the ruler 9 blocked by the mobile frame 10 to the mobile phone terminal. The staff can monitor the elongation of the prestressed tendon in real time through the mobile phone, thereby avoiding the problem of reverse arch caused by over-tension of the prestressed tendon, reducing the risk of reverse arch and broken tendons, and thus improving construction efficiency.

[0041] In one embodiment, a guide hole 29 is opened through the surface of the mobile frame 10, and a first guide rod 13 is fixedly connected between the first end plate 7 and the second end plate 8, and the first guide rod 13 passes through the guide hole 29 and is slidably connected to the guide hole 29. The first guide rod 13 serves as a movement guide for the mobile frame 10, thereby improving the stability of the movement of the first mobile frame 10.

[0042] In one embodiment, a second handle screw 15 is threadedly connected to the surface of the second end plate 8, and one end of the second handle screw 15 is rotatably connected to the mounting plate 14 through a second rotating connection seat 27, and a contact switch 26 is fixedly installed on the other side surface of the mounting plate 14, a battery box 17 is fixedly installed on the top surface of one end of the mounting frame 6, and an audible and visual alarm 18 is fixedly installed on the top surface of the battery box 17, and the output end of the contact switch 26 is electrically connected to the input end of the audible and visual alarm 18, which is a common control structure, wherein a second guide rod 16 is fixedly installed on one side surface of the mounting plate 14, and the second guide rod 16 passes through the second end plate 8 and is slidably connected with the second end plate 8, the mounting plate 14 is located between the first guide rod 13 and the ruler 9. After fixing the sleeve 11, the staff can rotate the second handle screw 15, and the second handle screw 15 drives the mounting plate 14 to move. The staff can move the mounting plate 14 to the scale position corresponding to the maximum elongation of the prestressed tendon through the scale information on the ruler 9. When the prestressed tendon is extended to the maximum elongation, the moving frame 10 contacts the contact switch 26, and the contact switch 26 triggers the sound and light alarm 18 to give an on-site alarm, reminding the staff to close the jack, thereby improving the safety of use.

[0043] In one embodiment, there are multiple groups of slots 2 arranged at equal angles along the central axis of the collar 1, and a threaded hole 20 is opened through the surface of the slot 2, a fixing hole 23 is opened at one end of the mounting frame 6 at the position corresponding to the threaded hole 20, and a second clevis bolt 19 is threadedly connected inside the threaded hole 20, and the second clevis bolt 19 passes through the threaded hole 20 and the fixing hole 23, the mounting frame 6 is inserted into the slot 2, and is fixed by the second clevis bolt 19 passing through the bolt hole and the fixing hole 23. The staff can install multiple groups of mounting frames 6 at one end of the collar 1 as needed, so as to monitor the elongation of multiple prestressed tendons, improve the comprehensiveness of monitoring, and improve the flexibility of use. At the same time, when the device is not in use, the mounting frame 6 can be removed for convenient classification and storage, and the assembly is flexible and convenient, which further improves the convenience of use. At the same time, the present invention has a simple structure, and the manufacturing and use costs are very low, which is suitable for large-scale promotion and use.

[0044] In one embodiment, ear plates 21 are integrally connected to both ends of the collar 1, and the ear plates 21 are fixedly connected by fixing bolts 22, which is a common assembly structure and will not be described in detail herein.

[0045] In one embodiment, the clamp ring 3 is an annular structure, and the inner surface of the clamp ring 3 is roughened, and the inner diameter of the clamp ring 3 is equal to the outer diameter of the jack, so as to facilitate clamping the outer surface of the jack.

[0046] In one embodiment, a battery is installed inside the battery box 17, and the battery is electrically connected to the sound and light alarm 18, the contact switch 26 and the wireless remote transmission camera 24 through electrical connecting lines. This is a common power supply structure and will not be described in detail here.

[0047] In one embodiment, the sleeve 11 and the mounting frame 6 are arranged in parallel, and the inner diameter of the sleeve 11 is larger than the outer diameter of the prestressed tendon, so as to facilitate the passage of the prestressed tendon.

[0048] A prestressed tendon elongation automatic monitoring device and a monitoring method thereof, comprising a prestressed tendon elongation automatic monitoring device, the specific method comprising the following steps:

[0049] S1. Installation steps: Sleeve the collar 1 on the outside of the jack, then fix the ear plate 21 with the fixing bolt 22 to close the collar 1, then turn the first handle screw 4 to drive the clamp ring 3 to move inward and clamp the jack, then sleeve the sleeve 11 on the outside of the prestressed tendon, then insert one end of the mounting frame 6 into the slot 2, fix the mounting frame 6 with the second clevis bolt 19, then slide the movable frame 10 until the left edge of the movable frame 10 is aligned with the zero scale line of the ruler 9, turn the first clevis bolt 12 to tighten the prestressed tendon, and the installation is completed.

[0050] S2. Debugging steps: Turn the second handle screw 15 to push the contact switch 26 to the scale corresponding to the maximum elongation of the prestressed tendon. Then, test the contact switch 26 and observe whether the sound and light alarm 18 alarms. If it alarms, it means that it is working normally. Then you can turn on the wireless remote camera 24 and connect it to the mobile phone. After the connection, observe whether the image is clear. If it is clear, you can carry out monitoring work. Otherwise, the staff needs to inspect and repair the sound and light alarm 18, contact switch 26, wireless remote camera 24, battery and mobile phone. I will not go into details here.

[0051] S3, monitoring steps: the jack stretches the prestressed tendon, and one end of the prestressed tendon moves outward, driving the sleeve 11 and the mobile frame 10 to move. The scale 9 corresponding to the left edge of the mobile frame 10 is transmitted to the staff of the mobile terminal in real time by the wireless remote transmission camera 24, and the monitoring is completed.

[0052] Working principle:

[0053] When the present invention is in use, the staff can sleeve the ring 1 on the outside of the jack, tighten the jack through the clamp ring 3, and then pass one of the prestressed tendons through the sleeve 11, and tighten and fix the prestressed tendon by rotating the first clevis bolt 12, so that the prestressed tendon and the sleeve 11 can be fixedly connected. During the operation of the jack, the prestressed tendon is stretched, driving the sleeve 11 to move, and the sleeve 11 drives the movable frame 10 to move. The movable frame 10 moves along the ruler 9, and the wireless remote transmission camera 24 transmits the scale information of the ruler 9 blocked by the movable frame 10 to the mobile phone terminal. The staff can monitor the elongation of the prestressed tendon in real time through the mobile phone, thereby avoiding the problem of reverse arch caused by over-tensioning of the prestressed tendon, reducing the risk of reverse arch and broken tendons, and thus improving construction efficiency.

[0054] In the present invention, unless otherwise clearly stipulated and limited, the terms such as "installation", "setting", "connection", "fixation" and "screw-on" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements. Unless otherwise clearly defined, ordinary technicians in this field can understand the specific meanings of the above terms in the present invention according to the specific circumstances.

[0055] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A prestressed tendon elongation automatic monitoring device and monitoring method, characterized in that: The invention comprises a collar (1) and a mounting frame (6), wherein the collar (1) is sleeved on the outside of the jack, and a first handle screw (4) is threadedly connected to the surface of the collar (1), and the other end of the first handle screw (4) is rotatably connected to a clamp ring (3) via a first rotating connection seat (5), and the clamp ring (3) is tightly fixed to the outer wall of the jack, and a slot (2) is provided on the surface of one end of the collar (1), and one end of the mounting frame (6) is fixedly inserted into the slot (2), and a first end plate (7) and a second end plate (8) are fixedly installed on the other end of the mounting frame (6), and the first end plate (7) and the second end plate (8) are A mobile frame (10) is arranged between the two ends of the mobile frame (10), the other end of the mobile frame (10) is fixedly connected with a sleeve (11), and the surface of the sleeve (11) is threadedly connected with a first horn bolt (12), a scale (9) is fixedly connected between the first end plate (7) and the second end plate (8), a rod hole (28) is opened through the surface of the mobile frame (10), the scale (9) passes through the rod hole (28) and is slidably abutted with the rod hole (28), a wireless remote transmission camera (24) is fixedly installed on the front face of the mobile frame (10) through a cantilever frame (25), and the wireless remote transmission camera (24) is wirelessly interconnected with a mobile phone.

2. The automatic monitoring device for elongation of prestressed tendons according to claim 1, characterized in that: A guide hole (29) is formed through the surface of the movable frame (10); a first guide rod (13) is fixedly connected between the first end plate (7) and the second end plate (8); and the first guide rod (13) passes through the guide hole (29) and is slidably connected to the guide hole (29).

3. The automatic monitoring device for elongation of prestressed tendons according to claim 1, characterized in that: A second handle screw (15) is threadedly connected to the surface of the second end plate (8), and one end of the second handle screw (15) is rotatably connected to the mounting plate (14) through a second rotating connection seat (27), and a contact switch (26) is fixedly mounted on the other side surface of the mounting plate (14), a battery box (17) is fixedly mounted on the top surface of one end of the mounting frame (6), and an audible and visual alarm (18) is fixedly mounted on the top surface of the battery box (17), and an output end of the contact switch (26) is electrically connected to an input end of the audible and visual alarm (18).

4. The automatic monitoring device for elongation of prestressed tendons according to claim 3 is characterized in that: A second guide rod (16) is fixedly mounted on one side surface of the mounting plate (14), and the second guide rod (16) passes through the second end plate (8) and is slidably connected to the second end plate (8).

5. The automatic monitoring device for elongation of prestressed tendons according to claim 1, characterized in that: The slots (2) are arranged in multiple groups at equal angles along the central axis of the collar (1), and a threaded hole (20) is provided through the surface of the slots (2), a fixing hole (23) is provided at one end of the mounting frame (6) at a position corresponding to the threaded hole (20), and a second clevis bolt (19) is threadedly connected through the inside of the threaded hole (20), and the second clevis bolt (19) passes through the threaded hole (20) and the fixing hole (23).

6. The automatic monitoring device for elongation of prestressed tendons according to claim 1, characterized in that: The two ends of the collar (1) are integrally connected with ear plates (21), and the ear plates (21) are fixedly connected via fixing bolts (22).

7. The automatic monitoring device for elongation of prestressed tendons according to claim 1, characterized in that: The clamp ring (3) is an annular structure, and the inner surface of the clamp ring (3) is roughened, and the inner diameter of the clamp ring (3) is equal to the outer diameter of the jack.

8. The automatic monitoring device for elongation of prestressed tendons according to claim 1, characterized in that: A storage battery is installed inside the battery box (17), and the storage battery is electrically connected to the sound and light alarm (18), the contact switch (26) and the wireless remote transmission camera (24) through electrical connecting wires.

9. The automatic monitoring device for elongation of prestressed tendons according to claim 1, characterized in that: The sleeve (11) and the mounting frame (6) are arranged in parallel, and the inner diameter of the sleeve (11) is larger than the outer diameter of the prestressed tendon.

10. A method for automatically monitoring the elongation of prestressed tendons, characterized in that: The invention comprises a prestressed tendon elongation automatic monitoring device as described in claims 1 to 9, wherein the specific method comprises the following steps: S1. Installation steps: Sleeve the collar (1) onto the outside of the jack, then fix the ear plate (21) with the fixing bolt (22) to close the collar (1), then rotate the first handle screw (4) to drive the clamping ring (3) to move inwards and clamp the jack, then sleeve the sleeve (11) onto the outside of the prestressed tendon, then insert one end of the mounting frame (6) into the slot (2), fix the mounting frame (6) with the second clevis bolt (19), then slide the movable frame (10) until the left edge of the movable frame (10) is aligned with the zero scale line of the ruler (9), rotate the first clevis bolt (12) to tighten the prestressed tendon, and the installation is completed. S2, debugging steps: rotate the second handle screw (15) to push the contact switch (26) to the scale corresponding to the maximum elongation of the prestressed tendon, then test the contact switch (26) to observe whether the sound and light alarm (18) alarms. If it alarms, it means that the work is normal, and the wireless remote transmission camera (24) can be turned on and connected to the mobile phone. After the connection, observe whether the image is clear. If it is clear, the monitoring work can be carried out. S3, monitoring step: the jack stretches the prestressed tendon, and one end of the prestressed tendon moves outward, driving the sleeve (11) and the movable frame (10) to move. The scale (9) corresponding to the left edge of the movable frame (10) is transmitted in real time by the wireless remote transmission camera (24) to the staff of the mobile terminal, and the monitoring is completed.

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