External prestressed steel cable force detection device

Abstract

The utility model discloses an external prestressed steel cable force detection device, which comprises a shock absorber, a dial indicator, a high-strength wrench and a hydraulic jack, and further comprises fixing plates symmetrically arranged at the bottom end of the shock absorber; the connecting plates are connected to the two fixing plates respectively, and the two connecting plates are oppositely arranged; the fixing nut is connected between the two connecting plates; the adjusting bolt is in threaded connection with the fixing nut; wherein the lower ends of the two fixing plates are connected with an external prestressed steel cable. The device is simple in structure, safe and reliable, can provide more stable supporting force for the whole structure under the condition that the effect of the shock absorber is not influenced, and can detect the cable force of an external prestressed steel beam; and meanwhile, the height of the external prestressed steel beam can be adjusted, so that the stress of the bridge structure is adjusted, and the purpose of improving the overall performance of the bridge is achieved.

Description

Technical Field

[0001] The utility model relates to a detection device, specifically an in vitro prestressed steel strand cable force detection device, belonging to the technical field of in vitro prestressed steel strand performance detection. Background Technique

[0002] Generally speaking, in vitro prestressed steel strands are currently mostly applied to in vitro prestressed reinforcement for the maintenance and reinforcement of bridges. Its principle is to apply prestress to the surface structure of the bridge, making the stress of the bridge structure more uniform, so as to achieve the purpose of improving the overall performance of the bridge. In addition, the in vitro prestressed reinforcement technology can, to a certain extent, improve the load-bearing capacity of the bridge. By carrying out the in vitro prestressed reinforcement technology externally, it can greatly improve the strength and stiffness of the bridge structure, so that the bridge can withstand greater external forces and loads. It plays a very important role in the renovation and maintenance of existing old bridges and bridges that need to improve the load-bearing capacity or need to upgrade the load. The effective cable force of the in vitro prestressed steel strand is related to the stress distribution and deformation state of the bridge structure, and is of great importance to the stability and safety of the maintained bridge. Affected by environmental conditions, such as rust, earthquake and temperature load, and with the increase of service life, the effective cable force of the in vitro prestressed steel strand will gradually decrease. Therefore, it is necessary to regularly detect the cable force of the in vitro prestressed steel strand to enable timely replacement of the in vitro prestressed steel strand, so as to extend the service life of the in vitro prestressed steel strand structure.

[0003] With the development of science and technology, the bridge cable force detection device has become more and more perfect. However, most of the current bridge cable force detection devices on the market are easily affected by the environment and have complex operations. The cost of some devices is high and they cannot be used under certain conditions. Therefore, it is difficult to apply them to the daily maintenance and detection of in vitro prestressed steel strands. Based on the above problems, this detection device is designed.

[0004] Therefore, the key to solving the above technical problems is to develop an in vitro prestressed steel strand cable force detection device with wide applicability. Summary of the Invention

[0005] In view of the many defects and deficiencies in the above background technique, the utility model has made improvements and innovations. The purpose is to provide an in vitro prestressed steel strand cable force detection device with a simple structure, safety and reliability, which can provide a more stable supporting force for the overall structure without affecting the effect of the shock absorber, and can detect the cable force of the in vitro prestressed steel strand.

[0006] Another object of the present utility model is to be able to adjust the height of the external prestressed steel tendon, so as to adjust the stress of the bridge structure, thereby achieving the purpose of improving the overall performance of the bridge.

[0007] To solve the above problems and achieve the above object of the invention, an external prestressed steel tendon force detection device of the present utility model is realized by adopting the following design structure and the following technical solutions:

[0008] As an improvement of an external prestressed steel tendon force detection device of the present utility model, it includes a shock absorber (6), a dial indicator (7), a high-strength wrench (8) and a hydraulic jack (9), and further includes:

[0009] A fixing plate (1), and the fixing plate (1) is symmetrically arranged at the bottom end of the shock absorber (6);

[0010] A connecting plate (2), and the connecting plates (2) are respectively connected to the two fixing plates (1), and the two connecting plates (2) are arranged oppositely;

[0011] A fixing nut (3), and the fixing nut (3) is connected between the two connecting plates (2);

[0012] An adjusting bolt (4), and the adjusting bolt (4) is threadedly connected to the fixing nut (3);

[0013] Wherein, the lower ends of the two fixing plates (1) are connected to the external prestressed steel tendon cable (5).

[0014] As an improvement of the above of the present utility model, the upper end of the fixing plate (1) is fixedly connected to the bottom end of the shock absorber (6), and the lower end of the fixing plate (1) is provided with an anti-slip structure in contact with the external prestressed steel tendon cable (5), and the anti-slip structure is an anti-slip structure in a pattern style.

[0015] As a further improvement of the above of the present utility model, the distance between the two fixing plates (1) is slightly smaller than the outer diameter of the external prestressed steel tendon cable (5) to increase the friction between the fixing plate (1) and the external prestressed steel tendon cable (5).

[0016] As a further improvement of the above of the present utility model, the lower end of the fixing plate (1) is provided with a concave connecting part in contact with the external prestressed steel tendon cable (5), and anti-slip lines are further provided on the outside of the concave connecting part.

[0017] As a still further improvement of the above of the present utility model, the connecting plates (2) are symmetrically and fixedly connected to the fixing plate (1);

[0018] The fixing nut (3) is fixedly connected between the two connecting plates (2).

[0019] As a further improvement of the above-mentioned utility model, the adjusting bolt (4) includes:

[0020] A screw rod (41), the lower part of the screw rod (41) is threadedly connected to the fixed nut (3);

[0021] A nut (42), the nut (42) is fixedly connected to the upper end of the screw rod (41);

[0022] Wherein, the nut (42) is in contact connection with the bottom end of the shock absorber (6).

[0023] As a further improvement of the above-mentioned utility model, a groove adapted to the lower end of the screw rod (41) is provided on the external prestressed steel strand cable (5), and the groove is circular;

[0024] One end of the high-strength wrench (8) is provided with a locking opening for locking connection with the nut (42), and the other end of the high-strength wrench (8) is provided with an internal thread groove through it.

[0025] As a further improvement of the above-mentioned utility model, an anti-slip layer with patterns is further provided in the groove to increase the friction with the screw rod (41).

[0026] As a further improvement of the above-mentioned utility model, a dial indicator mounting device (10a) is further included. The dial indicator mounting device (10a) includes an arc-shaped connecting piece for connecting the screw rod (41), a U-shaped connecting piece for connecting the dial indicator (7), and a connecting rod for connecting the arc-shaped connecting piece and the U-shaped connecting piece into one body.

[0027] As a further improvement of the above-mentioned utility model, a connecting device (10b) is further included between the high-strength wrench (8) and the hydraulic jack (9). The connecting device (10b) includes: a connecting screw rod, one end of the connecting screw rod is threadedly connected to the high-strength wrench (8);

[0028] A connecting nut, the connecting nut is threadedly connected to one end of the connecting screw rod on the outside of the high-strength wrench (8) for locking the high-strength wrench (8);

[0029] A connecting seat, one end of the connecting seat is threadedly connected to the other end of the connecting screw rod, and the other end of the connecting seat is connected to the working end of the hydraulic jack (9).

[0030] The beneficial effects of the present utility model compared with the prior art are:

[0031] 1. The present utility model replaces the steel plate support structure at the lower part of the original shock absorber with a steel plate plus bolt support structure. Without affecting the shock absorption effect of the shock absorber, two support structure devices are adopted to provide a more stable supporting force for the overall structure and can detect the cable force of the external prestressed steel strand.

[0032] 2. The test instruments required by the present utility model are simple and common, and each test instrument is easy to operate. The overall experimental process has a small operation difficulty. Even under the complex and difficult field detection environmental conditions, it can still run smoothly, avoiding the complex conditions required by the existing detection instruments and being more efficient during field measurement.

[0033] 3. When the present utility model detects the cable force of the external prestressed steel strand, it will not have a great impact on the original engineering structure, and the detection safety is relatively high.

[0034] 4. The bolt support structure of the present utility model can also adjust the height of the external prestressed steel strand, thereby adjusting the force of the bridge structure and achieving the purpose of improving the overall performance of the bridge.

[0035] 5. The exterior of the present utility model is coated with anti-rust paint, so it can prevent rust and extend the service life of the entire device. While achieving environmental protection, it also saves resources. At the same time, the exterior of the device is coated with self-luminous fluorescent materials, which can clearly mark the position of the device at night, in dark rooms, and in underground construction environments, effectively playing a role in safety tips, improving visibility, being easy for people to distinguish, and increasing safety during construction and daily life. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] The following further elaborates in detail the specific implementation manners of the present utility model in conjunction with the drawings, where:

[0037] Figure 1 is one of the usage state diagrams of the present utility model;

[0038] Figure 2 is the second usage state diagram of the present utility model;

[0039] Figure 3 is the third usage state diagram of the present utility model;

[0040] Figure 4 is the fourth usage state diagram of the present utility model;

[0041] Figure 5 is the fifth usage state diagram of the present utility model;

[0042] Figure 6 is one of the exploded structure schematic diagrams of the present utility model;

[0043] Figure 7It is the second exploded structure schematic diagram of the present utility model;

[0044] Figure 8 It is the sectional view of the present utility model;

[0045] Figure 9 It is the first schematic diagram of the local connection relationship of the present utility model;

[0046] Figure 10 It is the second schematic diagram of the local connection relationship of the present utility model;

[0047] Figure 11 It is the third schematic diagram of the local connection relationship of the present utility model;

[0048] Figure 12 It is the schematic diagram of the connection relationship between the fixed nut (3) component and the adjusting bolt (4) component of the present utility model;

[0049] Among them, the reference numerals in the figure: 1 - fixing plate;

[0050] 2 - connecting plate;

[0051] 3 - fixed nut;

[0052] 4 - adjusting bolt, 4 - screw rod, 42 - nut;

[0053] 5 - external prestressed steel strand cable;

[0054] 6 - shock absorber;

[0055] 7 - dial indicator;

[0056] 8 - high-strength wrench;

[0057] 9 - hydraulic jack;

[0058] 10a - dial indicator mounting device;

[0059] 10b - connecting device. Specific embodiments

[0060] In order to make the technical means, creative features, achieved purposes and functions of the present utility model easy to understand, the technical solutions of the present utility model will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present utility model will be described in detail below with reference to the accompanying drawings and embodiments.

[0061] As shown in the attached Figure 1 to the attached Figure 12 of an external prestressed steel strand cable force detection device, including a shock absorber 6, a dial indicator 7, a high-strength wrench 8 and a hydraulic jack 9, further including:

[0062] Fixing plate 1, and the fixing plate 1 is symmetrically arranged at the bottom end of the shock absorber 6;

[0063] Connecting plate 2, and the connecting plate 2 is respectively connected to the two fixing plates 1, and the two connecting plates 2 are arranged oppositely;

[0064] Fixing nut 3, and the fixing nut 3 is connected between the two connecting plates 2;

[0065] Adjusting bolt 4, and the adjusting bolt 4 is threadedly connected to the fixing nut 3;

[0066] Wherein, the lower ends of the two fixing plates 1 are connected to the external prestressed steel strand cable 5.

[0067] Furthermore, as Figure 6 shown, the upper end of the fixing plate 1 is fixedly connected to the bottom end of the shock absorber 6, and the lower end of the fixing plate 1 is provided with an anti-slip structure in contact with the external prestressed steel strand cable 5, and the anti-slip structure is an anti-slip structure in a pattern style.

[0068] In the present utility model, the fixing plate 1 is a steel plate, and the lower parts of the two steel plates in contact with the external prestressed steel strand cable 5 are printed with patterns, and the coverage range of the patterns exceeds about 4 - 5 cm above and below the part in contact with the external prestressed steel strand cable 5; through the above design, slippage between the two structures can be avoided, and stable friction can be provided between the fixing plate 1 and the external prestressed steel strand cable 5.

[0069] Furthermore, as Figure 8 shown, the distance between the two fixing plates 1 is slightly smaller than the outer diameter of the external prestressed steel strand cable 5 to increase the friction between the fixing plate 1 and the external prestressed steel strand cable 5.

[0070] In the present utility model, the length of the two fixing plates 1 is slightly larger than the radius of the external prestressed steel strand cable 5 by 5 - 7 cm, and the distance between the two fixing plates 1 is slightly smaller than the diameter of the external prestressed steel strand cable 5 by 1 - 2 cm; the clamping force of the two fixing plates 1 can provide stable vertical support force for the external prestressed steel strand cable 5.

[0071] Furthermore, as Figure 9 shown, the lower end of the fixing plate 1 is provided with a concave connecting part in contact with the external prestressed steel strand cable 5, and anti-slip lines are also provided on the outside of the concave connecting part.

[0072] As Figure 9 and Figure 10 shown, the connecting plate 2 is symmetrically and fixedly connected to the fixing plate 1;

[0073] The fixing nut 3 is fixedly connected between the two connecting plates 2.

[0074] In the present utility model, the connecting plate 2 is a steel plate, and the fixing nut 3 is welded to the connecting plates 2 on both sides; the fixing nut 3 rotates a certain distance on the screw rod 41, and the connecting plates 2 are welded to both sides of the fixing nut 3, and the connecting plates 2 are fixed to the fixing plates 1 on both sides by welding; the fixing nut 3 fixes the screw rod 41 through the structure of welding the connecting plates 2 and the fixing plates 1, avoiding lateral displacement of the screw rod 41.

[0075] Further, as Figure 11 shown, the adjusting bolt 4 includes:

[0076] A screw rod 41, the lower part of the screw rod 41 is threadedly connected to the fixing nut 3;

[0077] A nut 42, the nut 42 is fixedly connected to the upper end of the screw rod 41;

[0078] Wherein, the nut 42 is in contact connection with the bottom end of the shock absorber 6.

[0079] In the present utility model, the screw rod 41 is a semi-threaded screw rod or a full-threaded screw rod; the nut 42 is not welded to the shock absorber 6, but is fixed by the action of force, and the nut 42 can rotate under the action of a high-strength wrench 8; the adjusting bolt 4 is made of high-strength bolt material to minimize the deformation of the bolt due to the increase in service time; through the above design, the error generated in on-site measurement can be reduced, making the measurement result more accurate.

[0080] Specifically, the external prestressed steel strand cable 5 is provided with a groove adapted to the lower end of the screw rod 41, and the groove is circular in shape, facilitating connection and fastening with the present utility model;

[0081] One end of the high-strength wrench 8 is provided with a locking port for locking connection with the nut 42, and the other end of the high-strength wrench 8 is provided with an internally threaded groove through.

[0082] In the present utility model, the internally threaded groove of the high-strength wrench 8 is opened along the width direction of the high-strength wrench 8; during use, the internally threaded groove is parallel to the fixing nut 3; the bottom of the screw rod 41 is in close contact with the external prestressed steel strand cable 5 and is fixed by the action of force. The screw rod 41 supports the shock absorber 6 above and a part of the external prestressed steel strand cable 5 below. The lower part of the screw rod 41 is embedded in the circular groove on the surface of the corrugated pipe of the external prestressed steel strand cable 5, and the bottom of the screw rod 41 is closely attached to the bottom of the groove for vertical fixation; the bottom surface of the screw rod 41 is embedded in the circular groove of the external prestressed steel strand cable 5, and the depth of the circular groove is about 1 centimeter.

[0083] More specifically, the groove is also provided with a non-slip layer with patterns to increase the friction with the screw rod 41.

[0084] In the present utility model, an anti-slip layer with a pattern is printed inside the circular groove on the surface of the corrugated pipe of the external prestressed steel strand cable 5, corresponding to the pattern on the surface of the screw rod 41; through the above design, the adjusting bolt 4 can be fixed to prevent the adjusting bolt 4 from moving horizontally, so that the adjusting bolt 4 can provide stable vertical support for the overall structure.

[0085] Furthermore, it further includes a dial indicator mounting device 10a, which includes an arc-shaped connecting piece for connecting the screw rod 41, a U-shaped connecting piece for connecting the dial indicator 7, and a connecting rod for connecting the arc-shaped connecting piece and the U-shaped connecting piece into one body.

[0086] In the present utility model, the dial indicator mounting device 10a is used to connect between the dial indicator 7 and the screw rod 41. Among them, the inner diameter of the arc-shaped connecting piece is the same as the diameter of the screw rod 41, and the inner side of the arc-shaped connecting piece is connected to the screw rod 41; the inner length of the U-shaped connecting piece is slightly smaller than the diameter of the dial indicator 7, and the dial indicator 7 is clamped inside the U-shaped connecting piece.

[0087] Furthermore, it further includes a connecting device 10b arranged between the high-strength wrench 8 and the hydraulic jack 9. The connecting device 10b includes: a connecting screw rod, one end of which is threadedly connected to the high-strength wrench 8;

[0088] a connecting nut, which is threadedly connected to one end of the connecting screw rod outside the high-strength wrench 8 for locking the high-strength wrench 8;

[0089] a connecting seat, one end of which is threadedly connected to the other end of the connecting screw rod, and the other end of the connecting seat is connected to the working end of the hydraulic jack 9.

[0090] In the present utility model, as shown in the attached Figure 5 figure, the present utility model is installed at position A; on the outer surfaces of the fixing plate 1, the connecting plate 2, the fixing nut 3 and the adjusting bolt 4, an injection layer, an anti-rust layer and a warning layer are sequentially sprayed from the inside to the outside, and fluorescent powder is applied on the warning layer. A high-molecular wear-resistant material is injection-molded on the injection layer; the anti-rust layer includes an epoxy zinc-rich primer, a chlorinated rubber topcoat and an epoxy mica iron intermediate paint located between the epoxy zinc-rich primer and the chlorinated rubber topcoat; the warning layer is a single-color or a mixture of several colors of reflective warning tapes or reflective color films or reflective paints.

[0091] In summary, a more specific implementation manner of the present utility model is:

[0092] Before using an external prestressed steel strand cable force detection device with the above design structure, it needs to be manufactured and installed for standby.

[0093] The specific usage steps are:

[0094] Step 1, the operator determines the placement plane of the hydraulic jack 9 according to the on-site measurement conditions and selects an appropriate working support plane so that the hydraulic jack 9 can apply force in the correct direction.

[0095] Step 2, the operator conducts a pre-use inspection of the hydraulic jack 9 to ensure that all parts of the hydraulic jack 9 are intact, especially the oil pressure pipeline and the oil cylinder, etc., and ensure that the oil return screw is in a tightened state.

[0096] Step 3, the operator sets up the hydraulic jack 9 on the selected placement plane and fixes the hydraulic jack 9 as needed to prevent the hydraulic jack 9 from sliding or collapsing during operation.

[0097] Step 4, the operator tightly connects the high-strength wrench 8 to the nut 42 of the adjusting bolt 4. Subsequently, the operator adjusts the other end of the high-strength wrench 8 to connect the high-strength wrench 8 to the connecting nut of the connecting device 10b and fixes the high-strength wrench 8 through the connecting nut.

[0098] Step 5, the operator connects the hydraulic jack 9 and the high-strength wrench 8 together through the connecting device 10b, and adjusts the position and height of the hydraulic jack 9 so that the hydraulic jack 9 is connected to the high-strength wrench 8 through the connecting device 10b to prevent the hydraulic jack 9 and the high-strength wrench 8 from disconnecting during operation.

[0099] Step 6, for preparatory work, the operator places the dial indicator 7 and ensures that the dial indicator 7 is placed on a horizontal plane to improve the accuracy of the reading, and zeroes the dial indicator 7.

[0100] Step 7, the operator mounts the dial indicator 7 on the adjusting bolt 4 through the dial indicator mounting device 10a. After fixing the dial indicator 7, the operator makes the measuring rod of the dial indicator 7 contact the lower fixing nut 3, tries to ensure that there is no impurity between the dial indicator mounting device 10a and the screw rod 41, and gently rotates the dial indicator dial to make the measuring rod of the dial indicator operate.

[0101] Step 8, the operator slowly operates the hydraulic jack 9. During the operation, the operator observes and ensures that the hydraulic jack 9 can operate stably, and avoids overloading or pressurizing too quickly to prevent accidents.

[0102] Step 9, during the process of operating the hydraulic jack 9, the operator observes the scale dial of the dial indicator 7. When a reading appears on the scale dial of the dial indicator 7, the operator locks the hydraulic jack 9 at the current height position. After the reading stabilizes, the operator reads the reading.

[0103] Step 10, the operator slowly lowers the hydraulic jack 9 to its original position, zeroes the dial gauge 7, and repeats the above operation steps eight, and conducts two more measurements to ensure the accuracy of the results;

[0104] After all the above steps are completed, remove the dial gauge installation device 10a and the connecting device 10b and retract the hydraulic jack 9 to its original position; put away the instrument according to the instrument usage instructions, and remove and put away the high-strength wrench 8; perform the above operation process on the shock absorbers 6 at each position, and record the instrument readings at each position;

[0105] Step 11, the operator substitutes the reading of the scale of the dial gauge 7 into the stiffness formula for calculation. The stiffness is the stiffness of the measured external prestressed steel strand, and pay attention to unit conversion.

[0106] During use, the operator connects the dial gauge 7 to the screw 41 through the dial gauge installation device 10a, makes the inner side of the arc-shaped connecting piece connect above the screw 41, the dial gauge 7 is clamped inside the U-shaped connecting piece, and the measuring rod of the dial gauge 7 contacts the lower fixing nut 3;

[0107] When in use, the operator tightens the locking port of the high-strength wrench 8 with the nut 42, then threadedly connects through the connecting screw in the internal thread groove in the thickness direction of the high-strength wrench 8, and then fixes the high-strength wrench 8 through the connecting nut.

[0108] When in use, the operator first inserts the contact part above the hydraulic jack 9 into the connecting groove of the connecting seat to make them closely connected. Then the operator applies a lateral force to the connecting seat of the connecting device 10b through the hydraulic jack 9, thereby driving the connecting screw connected to the connecting seat to move laterally, which drives the high-strength wrench 8 threadedly connected to the connecting screw to generate a lateral displacement. Thus, the high-strength wrench 8 drives the nut 42 to rotate, and then makes the screw 41 part of the adjusting bolt 4 rotate downward, pressing down part of the external prestressed steel strand cable 5. At this time, the dial gauge 7 is located above the fixing nut 3, so the dial gauge 7 generates a reading, and this reading is the structural displacement data.

[0109] Finally, it should be noted that the above description is only a preferred embodiment of the present invention, and it is not a limitation of the present invention in other forms. Any person skilled in the art may use the disclosed technical content to make changes or modifications into equivalent embodiments with equivalent changes. However, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present invention without departing from the technical solution content of the present invention still fall within the protection scope of the technical solution of the present invention.

Claims

1. An external prestressed steel strand tension detection device, comprising a shock absorber (6), a dial gauge (7), a high-strength wrench (8) and a hydraulic jack (9), characterized in that: Further included are: A fixing plate (1), which is symmetrically arranged at the bottom end of the shock absorber (6); Connecting plates (2), which are respectively connected to the two fixing plates (1), and the two connecting plates (2) are arranged oppositely; A fixing nut (3), which is connected between the two connecting plates (2); An adjusting bolt (4), which is threadedly connected to the fixing nut (3); Wherein, the lower ends of the two fixing plates (1) are connected to the external prestressed steel strand cable (5).

2. The device for detecting the force of an external prestressed steel strand according to claim 1, characterized in that: The upper end of the fixing plate (1) is fixedly connected to the bottom end of the shock absorber (6), and the lower end of the fixing plate (1) is provided with an anti-slip structure in contact with the external prestressed steel strand cable (5), and this anti-slip structure is an anti-slip structure in a pattern style.

3. The device for detecting the force of an external prestressed steel strand according to claim 1, characterized in that: The distance between the two fixing plates (1) is slightly smaller than the outer diameter of the external prestressed steel strand cable (5) to increase the friction between the fixing plate (1) and the external prestressed steel strand cable (5).

4. The device for detecting the cable force of an external prestressed steel strand according to claim 1, characterized in that: The lower end of the fixing plate (1) is provided with a concave connecting portion in contact with the external prestressed steel strand cable (5), and anti-slip threads are further provided on the outside of this concave connecting portion.

5. The device for detecting the force of an external prestressed steel strand according to claim 1, characterized in that: The connecting plates (2) are symmetrically and fixedly connected to the fixing plate (1); The fixing nut (3) is fixedly connected between the two connecting plates (2).

6. The device for detecting the force of an external prestressed steel strand according to claim 1, characterized in that: The adjusting bolt (4) includes: A screw rod (41), the lower part of which is threadedly connected to the fixing nut (3); A nut (42), which is fixedly connected to the upper end of the screw rod (41); Wherein, the nut (42) is in contact connection with the bottom end of the shock absorber (6).

7. The device for detecting the force of an external prestressed steel strand according to claim 1, characterized in that: A groove adapted to the lower end of the screw rod (41) is formed on the external prestressed steel strand cable (5), and the groove is circular in shape; One end of the high-strength wrench (8) is provided with a locking opening for locking connection with the nut (42), and the other end of the high-strength wrench (8) is provided with an internal thread groove penetrating through.

8. The device for detecting the force of an external prestressed steel strand according to claim 7, characterized in that: An anti-slip layer with patterns is further provided in the groove to increase the friction with the screw rod (41).

9. The device for detecting the force of an external prestressed steel strand according to claim 1, characterized in that: Also included is a dial indicator mounting device (10a), which includes an arc-shaped connecting piece for connecting the screw rod (41), a U-shaped connecting piece for connecting the dial indicator (7), and a connecting rod for connecting the arc-shaped connecting piece and the U-shaped connecting piece into one body.

10. The device for detecting the force of an external prestressed steel strand according to claim 1, characterized in that: Also included is a connecting device (10b) arranged between the high-strength wrench (8) and the hydraulic jack (9), and the connecting device (10b) includes: a connecting screw rod, one end of which is threadedly connected to the high-strength wrench (8); A connecting nut, which is threadedly connected to one end of the connecting screw rod on the outside of the high-strength wrench (8) for locking the high-strength wrench (8); A connecting seat, one end of which is threadedly connected to the other end of the connecting screw rod, and the other end of the connecting seat is connected to the working end of the hydraulic jack (9).

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