A novel structure and installation method for a strain gauge for testing internal forces in a pile.

Abstract

This invention discloses a novel structure and installation method for a strain gauge used to test the internal forces of a pile. The invention relates to the field of strain gauge technology. The novel structure and installation protection technology for the strain gauge includes reinforcing bars and a sleeve. An end seat is installed on one outer wall of the sleeve, and a force-bearing handle is installed on the top of the end seat. A mounting plate is connected to one outer wall of the end seat, and a clamping strap is connected to one inner wall of the mounting plate. One outer wall of the clamping strap is connected to one outer wall of the end seat. A threaded rod is installed on the inner wall of the mounting plate, and a handle is installed at one end of the threaded rod. One end of the threaded rod passes through the mounting plate, making the strain gauge more secure and easier to operate during installation. It prevents positional displacement and damage during concrete pouring, ensuring the survival rate of the strain gauge and the accuracy of measurement data during subsequent use.

Description

Technical Field

[0001] This invention relates to the field of strain gauge technology, specifically to a novel strain gauge structure and installation method for testing the internal forces of a pile. Background Technology

[0002] Static load testing of bored piles is the most reliable method for determining the bearing capacity of the pile. This requires studying the stress characteristics of the pile, the interaction between the pile and the soil, the pile side resistance, and the pile end resistance. This necessitates obtaining the strain generated by the pile under load. The widely used method is to directly tie and embed strain gauges to the main reinforcement of the pile cage. However, the traditional strain gauge construction and installation methods have the following drawbacks:

[0003] ① The small contact area between the circular force-bearing handle of the strain gauge and the circular reinforcing bar binding wire results in unstable contact. 1) During installation, one person needs to install while another observes and adjusts the gauge to ensure that the strain gauge axis is parallel to the main reinforcing bar, leading to low installation efficiency. 2) When binding the strain gauge, uneven force can easily cause it to slide laterally from the main reinforcing bar or even slip off, resulting in the strain gauge axis not being parallel to the main reinforcing bar binding, which seriously affects the testing accuracy.

[0004] ② During the lowering of the reinforcing cage and the pouring of concrete, the shaking and floating of the reinforcing cage, the rising of mud, and the flowing concrete can all disturb the strain gauges on the reinforcing cage, causing unstable contact between the strain gauges and the reinforcing bars. This can easily lead to the strain gauges sliding laterally from the main reinforcement or even slipping off, resulting in strain gauge installation failure. For long piles, there is also the possibility that the strain gauges may directly touch during the vertical vibration of the concrete tremie pipe, causing damage to the strain gauges.

[0005] ③ The concrete is adjacent to the main reinforcing bars. Under the assumption of existing data processing, the strain of the concrete and the strain of the main reinforcing bars are the same under vertical load. However, the main reinforcing bars and concrete are different materials, and their elastic models (stiffness) differ greatly (generally, the elastic modulus of steel bars is 6-7 times that of concrete). Under relatively small vertical load conditions, the two can deform in coordination and their strains are basically the same with limited error. However, for pile foundations with large bearing capacity and large vertical loads, the concrete will undergo plastic deformation, and the strain deformation of the concrete and the main reinforcing bars will not be coordinated. Using the same value for both will result in a large error.

[0006] Therefore, a new structure and installation method for a strain gauge for testing the internal forces of a pile are proposed. Summary of the Invention

[0007] To address the shortcomings of existing technologies, this invention provides a novel structure and installation method for a strain gauge used for testing the internal forces of a pile. This method solves the problems of inconvenient and unstable installation of strain gauges, thereby improving the survival rate of strain gauges and enhancing testing accuracy.

[0008] To achieve the above objectives, the present invention provides the following technical solution: a novel strain gauge structure for testing the internal force of a pile, comprising a reinforcing bar and a sleeve, an end seat mounted on one outer wall of the sleeve, a force-bearing handle mounted on the top of the end seat, a mounting plate connected to one outer wall of the end seat, a clamping strap connected to one inner wall of the mounting plate, the outer wall of the clamping strap connected to one outer wall of the end seat, a threaded rod mounted on the inner wall of the mounting plate, and a handle mounted on one end of the threaded rod.

[0009] Preferably, one end of the threaded rod passes through the mounting plate, one end of the clamping strap passes through the mounting plate, a connecting rod is installed on one outer wall of the mounting plate, and the other end of the connecting rod is installed with the mounting plate.

[0010] Preferably, a threaded rod 2 is installed on one inner wall of the mounting plate 2, one end of the threaded rod 2 passes through the mounting plate 2, and a handle 2 is installed on one end of the threaded rod 2. A sliding rod 1 is installed on one outer wall of the threaded rod 2, and one outer wall of the sliding rod 1 is connected to the inner wall of the mounting plate 2. One end of the sliding rod 1 passes through the mounting plate 2.

[0011] Preferably, a clamping plate is installed on one outer wall of the sliding rod, a groove is formed on one outer wall of the clamping plate, a protrusion is installed on the inner wall of the groove, the inner wall of the groove is connected to the outer wall of the reinforcing bar, the protrusion is adapted to the reinforcing bar, the outer wall of the reinforcing bar is connected to one outer wall of the mounting plate, and a groove is formed on one outer wall of the clamping plate.

[0012] Preferably, a sliding plate 1 is installed on one outer wall of the mounting plate 2, and a sliding plate 2 is installed on the inner wall of the sliding plate 1. One end of the sliding plate 2 passes through the sliding plate 1. A limiting rod is installed on the inner wall of the sliding plate 2. One end of the limiting rod passes through the sliding plate 2. One outer wall of the limiting rod is connected to the inner wall of the groove. The limiting rod is cross-shaped. A sliding plate 3 is installed on the other end of the limiting rod.

[0013] Preferably, a sliding plate four is connected to one outer wall of the sliding plate three, and one outer wall of the sliding plate four is connected to the inner wall of the mounting plate two. One end of the sliding plate four passes through the mounting plate two, and a threaded rod three is installed on the inner wall of the sliding plate four. One end of the threaded rod three passes through the sliding plate four.

[0014] Preferably, one outer wall of the threaded rod three is connected to the inner wall of the mounting plate two, one end of the threaded rod three penetrates the mounting plate two, a handle three is installed on one outer wall of the threaded rod three, and a protective ear stud is provided on the outside of the threaded rod three.

[0015] This invention also provides an installation and protection technology for a novel strain gauge structure for testing internal forces in piles, comprising the following steps:

[0016] S1. Select the reinforcing bars for strain gauge installation according to the principle of keeping them as far away as possible from the "guide concrete blocks" on the reinforcing cage;

[0017] S2. Measure and mark the installation position of the strain gauge according to the design drawing, and install the protective ear pin above the installation position;

[0018] S3. By cooperating with the clamping plate, mounting plate two, sliding plate one, and sliding plate two, the mounting plate two, connecting rod, and mounting plate one are installed at the installation position;

[0019] S4. Perform integrity inspection on the strain gauge and record it in the strain gauge information record table. After the strain gauge has been inspected, install it on the mounting plate by using the clamping strap and threaded rod. Then install the transmission cable.

[0020] S5. Begin pouring concrete.

[0021] Preferably, the distance from the midpoint of the protective earring to the lower end of the strain gauge and the height of the protective earring satisfy the following relationship: b / (Dd)=h / H, where: d is the diameter of the concrete conduit;

[0022] b is to protect the height of the earring;

[0023] h represents the distance from the midpoint of the protective earring to the bottom of the strain gauge;

[0024] D is the diameter of the reinforcing cage;

[0025] H is the distance from the lower end of the strain gauge to the top of the pile.

[0026] Beneficial effects

[0027] This invention provides a novel structure and installation method for a strain gauge used for testing internal forces in piles. Compared with existing technologies, it offers the following advantages:

[0028] (1) The new structure and installation protection technology of the strain gauge for testing the internal force of the pile body, by setting up a sleeve, force handle, end seat, mounting plate one, clamping strap, handle one, threaded rod one, and rubber pad, the end seat is inserted into the mounting plate one, and then the clamping strap is passed through the mounting plate one, so that the strain gauge can be more secure and convenient to operate during installation, and there will be no positional displacement when pouring concrete, ensuring the accuracy of the measurement data when used later.

[0029] (2) The new structure and installation protection technology of the strain gauge for testing the internal force of the pile body is achieved by setting up a steel bar, a connecting rod, a second mounting plate, a second handle, a second threaded rod, a first sliding rod, a clamping plate, a groove, and a protrusion. The steel bar is inserted between the clamping plate and the second mounting plate, and then the second handle is rotated, so that the clamping plate and the second mounting plate cooperate to firmly install the whole on the steel bar, making the installation of the strain gauge more secure. When pouring concrete, there will be no positional displacement, ensuring the accuracy of the measurement data when used later.

[0030] (3) The new structure and installation protection technology of the strain gauge for testing the internal force of the pile body, by setting up a groove, sliding plate one, sliding plate two, limit rod, sliding plate three, sliding plate four, threaded rod three, handle three, and protective ear, after the clamping plate clamps the steel bar, the handle three is rotated so that sliding plate two, sliding plate one, clamping plate, and installation plate two form a closed space, which further increases the firmness and avoids the strain gauge from shifting position when pouring concrete, thus ensuring the accuracy of the measurement data when used later.

[0031] (4) The connecting rod can prevent the concrete strain gauge from being close to the main reinforcement. The installation position should be a certain distance away from the main reinforcement. In this way, under the vertical large load condition, the concrete strain gauge can test the strain of the pile concrete and represent the strain of the pile test section, which improves the test accuracy of the pile strain and better studies the bearing deformation characteristics of the pile. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0033] Figure 2 This is a structural diagram of the clamping band of the present invention;

[0034] Figure 3 This is a structural diagram of the clamping plate of the present invention;

[0035] Figure 4 This is a structural diagram of the card slot of the present invention;

[0036] Figure 5 This is an enlarged view of invention A;

[0037] Figure 6 This is a schematic diagram of the invention after installation.

[0038] In the diagram: 1. Rebar; 2. Sleeve; 3. Forced handle; 4. End seat; 5. Mounting plate one; 6. Clamping strap; 7. Handle one; 8. Threaded rod one; 9. Rubber pad; 10. Connecting rod; 11. Mounting plate two; 12. Handle two; 13. Threaded rod two; 14. Sliding rod one; 15. Clamping plate; 16. Slot; 17. Protrusion; 18. Groove; 19. Sliding plate one; 20. Sliding plate two; 21. Limiting rod; 22. Sliding plate three; 23. Sliding plate four; 24. Threaded rod three; 25. Handle three; 26. Protective earring; 27. Guide tube. Detailed Implementation

[0039] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0040] Please see Figure 1-5 This invention provides two technical solutions:

[0041] Example 1

[0042] A novel strain gauge structure for testing the internal force of a pile includes a reinforcing bar 1 and a sleeve 2. One outer wall of the sleeve 2 is connected to the inner wall of an end seat 4. The top of the end seat 4 is fixedly connected to one outer wall of a force-bearing handle 3. One outer wall of the end seat 4 is slidably connected to one outer wall of a mounting plate 5. An arc-shaped hole is provided on the outer wall of the mounting plate 5 near the end seat 4. This arc-shaped hole is adapted to the end seat 4, allowing the mounting plate 5 to limit the end seat 4 when the clamping strap 6 is inserted. By limiting the upper and lower end seats 4 through the upper and lower mounting plates 5, it is ensured that the strain gauge axis and the reinforcing bar 1 remain parallel during installation. One inner wall of the mounting plate 5 is slidably connected to one outer wall of the clamping strap 6. The mounting plate 5 is slidably connected to the outer wall of the end seat 4. The inner wall of the mounting plate 5 is threadedly connected to the outer wall of the threaded rod 8. One end of the threaded rod 8 is fixedly connected to the outer wall of the handle 7. One end of the threaded rod 8 extends through the outer wall of the mounting plate 5 to the interior of the mounting plate 5. One side of the outer wall of the rubber pad 9 is fixedly installed on the outer wall of the threaded rod 8. The diameter of the rubber pad 9 is smaller than the diameter of the threaded rod 8. One end of the clamping band 6 extends through the outer wall of the mounting plate 5 to the exterior of the mounting plate 5. One side of the outer wall of the mounting plate 5 is fixedly connected to one end of the connecting rod 10. The other end of the connecting rod 10 is fixedly installed on the outer wall of the mounting plate 11. The length of the connecting rod 10 can be selected according to different pile bodies.

[0043] In use, the end seat 4 is inserted into the mounting plate 5, and then the clamping band 6 is passed through the mounting plate 5 and fitted onto the end seat 4. The two handles 7 are rotated respectively, so that the two threaded rods 8 extend into the mounting plate 5, thereby squeezing the clamping band 4. By installing rubber pads 9 at the bottom of the threaded rods 8, rigid contact is effectively avoided, preventing the clamping band 6 from breaking due to excessive force.

[0044] Example 2

[0045] The technical solution of this embodiment, which differs from that of Embodiment 1, includes: one inner wall of the mounting plate 2 11 is movably connected to the outer wall of the threaded rod 2 13 via a bearing 1; one end of the threaded rod 2 13 extends through the outer wall of the mounting plate 2 11 into the interior of the mounting plate 2 11; one end of the threaded rod 2 13 is fixedly connected to one outer wall of the handle 2 12; one outer wall of the threaded rod 2 13 is threadedly connected to one inner wall of the sliding rod 14; one outer wall of the sliding rod 14 is slidably connected to the inner wall of the mounting plate 2 11; one end of the sliding rod 14 extends through the outer wall of the mounting plate 2 11 into the interior of the mounting plate 2 11; and the sliding rod 1... One outer wall of 14 is fixedly connected to one outer wall of clamping plate 15. A groove 16 is provided on one outer wall of clamping plate 15. The inner wall of groove 16 is fixedly connected to one outer wall of protrusion 17. The inner wall of groove 16 is slidably connected to the outer wall of reinforcing bar 1. Protrusion 17 is adapted to reinforcing bar 1. The outer wall of reinforcing bar 1 is slidably connected to one outer wall of mounting plate 21. A groove 18 is provided on one outer wall of clamping plate 15. One outer wall of mounting plate 21 is hinged to one outer wall of sliding plate 19. The inner wall of sliding plate 19 is slidably connected to one outer wall of sliding plate 20. One end of the sliding plate 20 extends through the outer wall of the sliding plate 19 and into the interior of the sliding plate 19. The inner wall of the sliding plate 20 is slidably connected to one side of the outer wall of the limiting rod 21. One end of the limiting rod 21 extends through the outer wall of the sliding plate 20 and into the exterior of the sliding plate 20. One side of the limiting rod 21 is slidably connected to the inner wall of the groove 18. The limiting rod 21 is cross-shaped. The other end of the limiting rod 21 is fixedly installed on one side of the outer wall of the sliding plate 32. One side of the outer wall of the sliding plate 32 is slidably connected to the inner wall of the sliding plate 43. One side of the outer wall of the sliding plate 43 is slidably connected to the inner wall of the mounting plate 21. One end of the sliding plate 23 extends through the outer wall of the mounting plate 21 to the interior of the mounting plate 21. The inner wall of the sliding plate 23 is threadedly connected to the outer wall of the threaded rod 24. One end of the threaded rod 24 extends through the outer wall of the sliding plate 23 to the exterior of the sliding plate 23. One side of the outer wall of the threaded rod 24 is movably connected to the inner wall of the mounting plate 21 via the bearing 2. One end of the threaded rod 24 extends through the outer wall of the mounting plate 21 to the interior of the mounting plate 21. One side of the outer wall of the threaded rod 24 is fixedly connected to one side of the outer wall of the handle 25. A protective ear stud 26 is provided on the exterior of the threaded rod 24.

[0046] In use, the reinforcing bar 1 is inserted between the clamping plate 15 and the mounting plate 2 11. Then, the handle 2 12 is rotated, causing the threaded rod 2 13 to rotate. The threaded rod 2 13 then rotates the sliding rod 1 14. The mounting plate 2 11 limits the sliding rod 1 14, allowing it to move along the mounting plate 2 11. This allows the clamping plate 15 and the mounting plate 2 11 to securely mount the strain gauge onto the reinforcing bar 1. A protrusion 17 is provided in the groove 16 to match the texture of the reinforcing bar 1, further increasing friction. After the clamping plate 15 clamps the reinforcing bar 1, the handle 3 25 is rotated, causing the threaded rod 3 24 to rotate. The threaded rod 3 24 then rotates the sliding plate 4 23. The mounting plate 2 11 limits the sliding plate 4 23, allowing it to move along the mounting plate 2 11. Plate 21 moves up and down, causing sliding plate 423 to move sliding plate 32. Sliding plate 322 then moves limiting rod 21, which passes through sliding plate 20 and engages in the groove 18 on the surface of clamping plate 15. This creates a closed space between sliding plate 20, sliding plate 19, clamping plate 15, and mounting plate 21, further increasing stability. Sliding plates 20, 19, 32, and 43 can all slide, accommodating steel bars 1 of different diameters. During installation, a protective ear 26 is installed above each strain gauge. Welding is preferred for installing the protective ear 26. The protective ear 26 can be triangular, trapezoidal, or other shapes, with isosceles triangles being preferred to prevent damage to the strain gauge during the lowering of the guide tube 27.

[0047] This invention also provides an installation and protection technology for a novel strain gauge structure for testing internal forces in piles, comprising the following steps:

[0048] S1. Select the strain gauge installation steel bar 1 according to the principle of keeping it as far away as possible from the "guide concrete block" on the steel cage to prevent the "guide concrete block" from rolling and colliding with and rubbing against the transmission cable during the cage lowering process, which would damage the transmission cable.

[0049] S2. Measure and mark the installation position of the strain gauge according to the design drawing, and install the protective ear 26 above the installation position. One side of the outer wall of the protective ear 26 is triangular.

[0050] S3. By cooperating with clamping plate 15, mounting plate 21, sliding plate 19, and sliding plate 20, mounting plate 21, connecting rod 10, and mounting plate 15 are installed at the installation position.

[0051] S4. Perform an integrity inspection on the strain gauges and record the results in the strain gauge information record sheet. After the inspected strain gauges are installed on the mounting plate 5 using the clamping strap 6 and threaded rod 8, install the transmission cable. The transmission cable is tied to the outside of the reinforcing bar 1 and led out along the outside of the reinforcing bar 1 towards the top of the pile, and is secured and straightened with a strap. Avoid damaging the strain gauges and transmission cable during the lower guide tube 27 (approximately 28cm in diameter) and during concrete pouring.

[0052] S5. After the strain gauge is installed, perform a second reading test to check whether the strain gauge has a stable reading (strain or frequency value, serial number, temperature, etc.) and record the reading.

[0053] S6. Weld a steel protective pipe near the top of the selected steel bar 1. Grind the pipe opening smooth. Then pass the transmission cable through the steel protective pipe. Fill the steel protective pipe with plastic and seal it with tape to prevent damage to the transmission cable. The steel protective pipe needs to extend 30-40cm above the ground.

[0054] S7. The strain gauge joints should be packed in plastic bags and tied to prevent water from entering. They should be hung on the top of the steel protective pipe. The details of the protection of the transmission cables should be explained to the on-site technical personnel of the construction unit, and a warning sign should be erected.

[0055] S8. Begin pouring concrete.

[0056] The distance from the midpoint of the protective earring 26 to the lower end of the strain gauge and the height of the protective earring 26 satisfy the following relationship: b / (Dd)=h / H, where: d is the diameter of the concrete conduit 27;

[0057] b is to protect the height of the earring 26;

[0058] h represents the distance from the midpoint of the protective earring 26 to the lower end of the strain gauge;

[0059] D is the diameter of the reinforcing cage;

[0060] H is the distance from the lower end of the strain gauge to the top of the pile.

[0061] Furthermore, any content not described in detail in this specification is existing technology known to those skilled in the art.

[0062] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0063] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A strain gauge structure for testing the internal force of a pile, comprising a reinforcing bar (1) and a sleeve (2), characterized in that: An end seat (4) is installed on one side of the outer wall of the sleeve (2). A force-bearing handle (3) is installed on the top of the end seat (4). An installation plate (5) is connected to one side of the outer wall of the end seat (4). A clamping band (6) is connected to one side of the inner wall of the installation plate (5). One side of the outer wall of the clamping band (6) is connected to one side of the outer wall of the end seat (4). A threaded rod (8) is installed on the inner wall of the installation plate (5). A handle (7) is installed at one end of the threaded rod (8). A connecting rod (10) is installed on one side of the outer wall of the mounting plate (5), and a mounting plate (11) is installed on the other end of the connecting rod (10). The outer wall of the reinforcing bar (1) is connected to one side of the outer wall of the mounting plate (11).

2. The strain gauge structure for testing the internal force of a pile according to claim 1, characterized in that: One end of the threaded rod (8) passes through the mounting plate (5), and one end of the clamping band (6) passes through the mounting plate (5).

3. The strain gauge structure for testing the internal force of a pile according to claim 2, characterized in that: A threaded rod 2 (13) is installed on one inner wall of the mounting plate 2 (11). One end of the threaded rod 2 (13) passes through the mounting plate 2 (11). A handle 2 (12) is installed on one end of the threaded rod 2 (13). A sliding rod 1 (14) is installed on one outer wall of the threaded rod 2 (13). One outer wall of the sliding rod 1 (14) is connected to the inner wall of the mounting plate 2 (11). One end of the sliding rod 1 (14) passes through the mounting plate 2 (11).

4. The strain gauge structure for testing the internal force of a pile according to claim 3, characterized in that: A clamping plate (15) is installed on one side of the outer wall of the sliding rod (14). A groove (16) is provided on one side of the outer wall of the clamping plate (15). A protrusion (17) is installed on the inner wall of the groove (16). The inner wall of the groove (16) is connected to the outer wall of the reinforcing bar (1). The protrusion (17) is adapted to the reinforcing bar (1). A groove (18) is provided on one side of the outer wall of the clamping plate (15).

5. The strain gauge structure for testing the internal force of a pile according to claim 4, characterized in that: A sliding plate 1 (19) is installed on one side of the outer wall of the mounting plate 2 (11), and a sliding plate 2 (20) is installed on the inner wall of the sliding plate 1 (19). One end of the sliding plate 2 (20) passes through the sliding plate 1 (19). A limiting rod (21) is installed on the inner wall of the sliding plate 2 (20). One end of the limiting rod (21) passes through the sliding plate 2 (20). One side of the outer wall of the limiting rod (21) is connected to the inner wall of the groove (18). The limiting rod (21) is cross-shaped. A sliding plate 3 (22) is installed on the other end of the limiting rod (21).

6. The strain gauge structure for testing the internal force of a pile according to claim 5, characterized in that: A sliding plate four (23) is connected to one side of the outer wall of the sliding plate three (22). One side of the outer wall of the sliding plate four (23) is connected to the inner wall of the mounting plate two (11). One end of the sliding plate four (23) passes through the mounting plate two (11). A threaded rod three (24) is installed on the inner wall of the sliding plate four (23). One end of the threaded rod three (24) passes through the sliding plate four (23).

7. The strain gauge structure for testing the internal force of a pile according to claim 6, characterized in that: One side of the outer wall of the threaded rod three (24) is connected to the inner wall of the mounting plate two (11). One end of the threaded rod three (24) is set through the mounting plate two (11). A handle three (25) is installed on one side of the outer wall of the threaded rod three (24). A protective ear stud (26) is provided on the outside of the threaded rod three (24).

8. A method for installing a strain gauge structure for testing the internal force of a pile, applicable to the strain gauge structure for testing the internal force of a pile as described in any one of claims 1-7, characterized in that, Includes the following steps: S1. Select the reinforcing bars for strain gauge installation according to the principle of keeping them as far away as possible from the "guide concrete blocks" on the reinforcing cage (1); S2. Measure and mark the installation position of the strain gauge according to the design drawing, and install the protective ear (26) above the installation position; S3. By cooperating with clamping plate (15), mounting plate two (11), sliding plate one (19), and sliding plate two (20), mounting plate two (11), connecting rod (10), and mounting plate one (5) are installed at the installation position; S4. Perform integrity inspection on the strain gauge and record it in the strain gauge information record table. After the strain gauge has been inspected, install it on the mounting plate (5) by using the clamping strap (6) and threaded rod (8). Then install the transmission cable. S5. Begin pouring concrete.

9. The installation method of the strain gauge structure for testing the internal force of a pile according to claim 8, characterized in that: The outer wall of one side of the protective ear stud (26) is triangular. The distance from the midpoint of the protective ear stud (26) to the lower end of the strain gauge and the height of the protective ear stud (26) satisfy the following relationship: b / (Dd)=h / H, where: d is the diameter of the concrete conduit. b is the height to protect the earring (26); h is the distance from the midpoint of the protective earring (26) to the lower end of the strain gauge; D is the diameter of the reinforcing cage; H is the distance from the lower end of the strain gauge to the top of the pile.

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