Device for testing bearing capacity of soil body behind pile

Abstract

The utility model provides a post-pile soil bearing capacity testing device which comprises a supporting frame, a mounting shell and a mounting rod, a top plate is arranged at the top of the supporting frame, wing plates are symmetrically arranged on the two sides of the top of the top plate, a jack is mounted in the mounting shell, and the output end of the jack and the side, away from the jack, of the mounting shell are both connected with abutting blocks. Guide strips are arranged on the side wall of the mounting shell, guide grooves matched with the guide strips are formed in the opposite sides of the two wing plates, the mounting shell is slidably arranged between the two wing plates through the guide strips, the two mounting rods are arranged on the side, away from the fixed pile, of the stress pile, and a plurality of mounting plates are arranged between the two mounting rods at equal intervals in the length direction of the two mounting rods. And a soil pressure meter is mounted on one side, deviating from the mounting rod, of each mounting plate through a mounting assembly, so that the problems that in the prior art, when the bearing capacity of a pile foundation and a soil body behind the pile is detected, a jack fixing pile is connected, the connection strength is difficult to guarantee, and time is consumed in subsequent disassembly are solved.

Description

Technical Field

[0001] This utility model relates to the field of pile foundation testing technology, and in particular to a device for testing the bearing capacity of soil behind piles. Background Technology

[0002] In conventional designs, cable-stayed anchors and ground embankments often use gravity anchors. However, gravity anchors have disadvantages such as large footprint, high concrete consumption, significant environmental impact, and large amounts of construction waste generated during demolition. Gravity anchors mainly balance horizontal tension through base friction and lateral earth pressure. Pile anchors, as an alternative, can significantly reduce these disadvantages. However, it is necessary to measure the bearing capacity of the pile foundation and the soil behind the pile. Generally, a single pile foundation is used as a fixed pile, and jacks are installed on the fixed pile. The jacks apply horizontal thrust to the stressed pile. The deformation of the soil and pile foundation is monitored in real time and the data is recorded using devices such as earth pressure gauges, inclinometers, and dial gauges embedded in the soil. This facilitates subsequent analysis and evaluation of the bearing capacity of the pile foundation and the soil behind the pile.

[0003] Currently, in the bearing capacity testing of pile foundations and soil behind piles, jacks are usually welded directly to the fixed piles via connecting plates in order to apply thrust and monitor the pile foundation's response. However, the reliability of the strength at the welded joint is difficult to guarantee, and too much time is required to remove the jacks and connecting plates after each test. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides a pile-back soil bearing capacity testing device, which solves the problem that in existing technologies, when testing the bearing capacity of pile foundations and the soil behind the piles, the jacks are connected to the fixed piles by welding, making it difficult to guarantee the connection strength and causing time-consuming subsequent disassembly.

[0005] According to an embodiment of this utility model, a soil bearing capacity testing device after a pile includes a support frame, a mounting shell, and mounting rods. The support frame is located at one end of a fixed pile, and a top plate is provided on the top of the support frame. Wing plates are symmetrically provided on both sides of the top of the top plate. A jack is installed inside the mounting shell. The output end of the jack and the side of the mounting shell opposite to the jack are connected to abutment blocks through connecting components. Each abutment block has an arc-shaped groove. A guide strip is provided on the side wall of the mounting shell. Guide grooves that cooperate with the guide strips are provided on the opposite sides of the two wing plates. The mounting shell is slidably set between the two wing plates through the guide strips. There are two mounting rods, which are located on the side of the stressed pile opposite to the fixed pile. The two mounting rods are connected by several connecting rods. Several mounting plates are provided at equal intervals along the length of the two mounting rods. A soil pressure gauge is installed on the side of each mounting plate opposite to the mounting rod through a mounting component.

[0006] Compared with the prior art, this utility model has the following advantages: By adopting a support frame, the bottom of the support frame is pre-embedded in the soil at a predetermined position to fix the support frame. The jack is installed in the mounting shell, which is slidably set between the two wing plates by guide strips, making it easy to adjust the position of the jack. This allows the abutment block installed on the mounting shell to abut against the fixed pile. The soil pressure gauges on the two mounting rods are pre-embedded on one side of the stressed pile, making it easy to monitor the soil bearing capacity after the stressed pile is stressed. Since the bottom of the support frame is fixed in the soil, and the two wing plates of the top plate of the support frame limit the mounting shell, the jack installed in the mounting shell can only move horizontally. This ensures that the jack will not shift vertically when applying horizontal thrust, and also makes it convenient and quick to disassemble and separate the jack from the fixed pile.

[0007] Furthermore, the installation components include: limiting posts, with multiple limiting posts fixedly installed on the side of each mounting plate facing the load-bearing pile, and each limiting post having an installation groove at the end away from the mounting plate, and an L-shaped stop bar connected to each installation groove by a spring.

[0008] Furthermore, it also includes a dial indicator, with a cross plate detachably mounted on the two mounting rods, and the dial indicator is fixedly connected to the cross plate.

[0009] Furthermore, each mounting rod is fixedly provided with a mounting block at its top, and each mounting block is fixedly provided with a screw rod at its top. A through hole is provided on the horizontal plate for the screw rod to pass through, and a nut is screwed onto each screw rod.

[0010] Furthermore, the connecting assembly includes: a connecting plate, one side of which is connected to the abutment block, and two I-beams supporting the ground on the other side of the connecting block.

[0011] Furthermore, a connecting plate is installed on one side of the two I-beams that abut against each other.

[0012] Furthermore, a limiting block is provided on the outer wall of the abutment block, and the limiting block slides in conjunction with the guide groove. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the working state of an embodiment of the present utility model.

[0014] Figure 2 This is a front view of an embodiment of the present utility model.

[0015] Figure 3 This is a schematic diagram of the mounting shell and wing plate in an embodiment of the present invention.

[0016] Figure 4 This is a schematic diagram of the installation component structure according to an embodiment of the present utility model.

[0017] In the above attached diagram: 1. Support frame; 2. Top plate; 3. Wing plate; 4. Mounting shell; 5. Jack; 6. Abutment block; 7. Guide strip; 8. Guide groove; 9. Mounting rod; 10. Mounting plate; 11. Earth pressure gauge; 12. Limiting post; 13. Spring; 14. Stop bar; 15. Dial indicator; 16. Horizontal plate; 17. Mounting block; 18. Screw; 19. Nut; 20. Connecting plate; 21. I-beam; 22. Limiting block. Detailed Implementation

[0018] The technical solution of this utility model will be further described below with reference to the accompanying drawings and embodiments.

[0019] like Figure 1-3As shown, this utility model embodiment proposes a soil bearing capacity testing device after pile, including a support frame 1, a mounting shell 4, and mounting rods 9. The support frame 1 is set at one end of the fixed pile, and a top plate 2 is provided on the top of the support frame 1. Wing plates 3 are symmetrically provided on both sides of the top of the top plate 2. A jack 5 is installed inside the mounting shell 4. The output end of the jack 5 and the side of the mounting shell 4 away from the jack 5 are connected to abutment blocks 6 through connecting components. Each abutment block 6 has an arc-shaped groove. A guide strip 7 is provided on the side wall of the mounting shell 4. Guide grooves 8 that cooperate with the guide strip 7 are provided on the opposite sides of the two wing plates 3. The mounting shell 4 is slidably set between the two wing plates 3 through the guide strip 7. There are two mounting rods 9, which are set on the side of the stressed pile away from the fixed pile. The two mounting rods 9 are connected by several connecting rods. Several mounting plates 10 are provided at equal intervals along the length direction between the two mounting rods 9. A soil pressure gauge 11 is installed on the side of each mounting plate 10 away from the mounting rod 9 through an installation component. In this embodiment, the support frame 1 is composed of several horizontal and vertical bars that are detachably connected. The connection method between the horizontal and vertical bars can be either snap-fit ​​or threaded, facilitating disassembly after subsequent testing. When testing the pile foundation, it needs to be done between two piles, one of which is a fixed pile, and the pile to be tested is a load-bearing pile. The support frame 1 is installed on the side of the fixed pile facing the load-bearing pile, i.e., the bottom of the support frame 1 is buried in the soil. Then, the mounting shell 4, on which the jack 5 is installed, is slidably positioned between the two flanges 3 via the guide strip 7. The output end of the jack 5, connected to the abutment block 6 via the connecting component, abuts against the load-bearing pile. Specifically, the arc-shaped groove of the abutment block 6 is engaged with the outer wall of the load-bearing pile. The end of the mounting shell 4 facing away from the jack 5, connected to the abutment block 6 via the connecting component, abuts against the fixed pile. Specifically, the arc-shaped groove of the abutment block 6 is engaged with the outer wall of the fixed pile. On one side of the load-bearing pile, a deep hole is pre-drilled on one side of the load-bearing pile, and two mounting rods 9 are lowered into the deep hole. The earth pressure gauge 11 on the mounting plate 10 is inserted into the bottom of the deep hole and is made to fit tightly against the inner wall of the deep hole. After installation, the jack 5 is started, and the jack 5 applies a horizontal thrust to the load-bearing pile. Since the guide strip 7 on the outer wall of the mounting shell 4 slides and engages with the guide groove 8 on the two wing plates 3, the mounting shell 4 will not move vertically during the application of force by the jack 5, thus avoiding the tilting of the jack 5. During the continuous application of force by the jack 5, the earth pressure gauge 11 transmits data to the corresponding reading instrument or acquisition system. The staff can understand the earth pressure on each earth pressure gauge 11 at each stage through the feedback data, thereby analyzing the magnitude and trend of the stress on the soil of the load-bearing pile, and then assessing the bearing capacity of the pile foundation. After the inspection is completed, the various components of this device can be disassembled.

[0020] like Figure 1 , 2As shown in Figure 4, the installation assembly further includes: limiting posts 12. Multiple limiting posts 12 are fixedly provided on the side of each mounting plate 10 facing the load-bearing pile. Each limiting post 12 has an installation groove at its end away from the mounting plate 10. An L-shaped stop bar 14 is connected to each installation groove via a spring 13. Specifically, one end of each spring 13 is fixedly connected to the inner wall of the installation groove, and the other end of each spring 13 is fixedly connected to the corresponding L-shaped stop bar 14. When not affected by external force, the stop bar 14 is in a state that restricts the soil pressure gauge 11 from detaching. In this embodiment, limiting posts 12 are provided at the four corners of one side of the mounting plate 10. The mounting plate 10 is placed between the four limiting posts 12, and then the L-shaped stop bar 14 is rotated, so that one end of the stop bar 14 restricts the soil pressure gauge 11, effectively preventing the soil pressure gauge 11 from detaching from the mounting plate 10 while facilitating the installation and removal of the soil pressure gauge 11.

[0021] like Figure 1-2 As shown, furthermore, it also includes a dial gauge 15, and a horizontal plate 16 is detachably mounted on the two mounting rods 9, with the dial gauge 15 fixedly connected to the horizontal plate 16. Specifically, the horizontal plate 16 is a steel plate, and the base of the dial gauge 15 has a magnetic base. The dial gauge 15 is fixedly connected to the horizontal plate 16 through the magnetic base. By setting the dial gauge 15 on the horizontal plate 16, before the jack 5 applies force to the load-bearing pile, the measuring head of the dial gauge 15 is brought into contact with the load-bearing pile and the reading of the dial gauge 15 is recorded. After the jack 5 applies force, the reading of the dial gauge 15 is recorded again, which facilitates the staff to analyze the bearing capacity of the load-bearing pile after being subjected to horizontal thrust and to verify the data with the earth pressure gauge 11.

[0022] like Figure 2 As shown, each mounting rod 9 is further provided with a mounting block 17 at its top, and a screw 18 is provided with a screw rod at its top. The horizontal plate 16 has a through hole for the screw rod 18 to pass through, and a nut 19 is screwed onto each screw rod 18. When installing the horizontal plate 16, the two mounting rods 9 are passed through the through holes on the horizontal plate 16 to place the horizontal plate 16 on the mounting block 17. Then, by rotating the nut 19, the nut 19 locks the horizontal plate 16, preventing it from moving in the vertical direction, thus completing the connection between the horizontal plate 16 and the two mounting rods 9. When not in use, the horizontal plate 16 can be removed from the two mounting rods 9 by rotating the nut 19.

[0023] like Figure 1-2As shown, the connecting assembly further includes: a connecting plate 20, one side of which is connected to the abutment block 6, and two I-beams 21 supporting the ground on the other side of the connecting block. On the mounting shell 4, two I-beams 21 are provided on the side of the mounting shell facing the fixed pile, with the ends of the two I-beams 21 away from the connecting shell fixed to the connecting plate 20. On the jack 5, two I-beams 21 are provided at the output end of the jack 5, with the ends of the two I-beams 21 away from the jack 5 fixed to the connecting plate 20. Due to the high strength and rigidity of the I-beams 21, the thrust generated by the jack 5 is transmitted through the I-beams 21, providing stable support and making the jack 5 more stable when applying force, thus ensuring the safety and stability of the structure.

[0024] like Figure 1-2 As shown, furthermore, the two I-beams 21 are abutted on one side of the connecting plate 20. By abutting the two I-beams 21 and supporting each other, the overall strength of the I-beams 21 is improved to withstand the thrust of the jack 5.

[0025] like Figure 1-2 As shown, furthermore, a limiting block 22 is provided on the outer wall of the abutment block 6, and the limiting block 22 is slidably engaged with the guide groove 8. After the abutment block 6, which is abutting against the fixed pile, is subjected to the reverse thrust of the jack 5, the limiting block 22 on the outer wall of the abutment block 6 is slidably engaged with the guide groove 8, and the support frame 1 is fixed by the soil, so the abutment block 6 will not move vertically, effectively preventing the abutment block 6, which is abutting against the fixed pile, from shifting when subjected to the reverse thrust.

[0026] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the spirit and scope of the technical solutions of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A device for inspecting the bearing capacity of soil mass behind a pile, characterized by, The utility model relates to a soil pressure measuring device for stress pile, which comprises the following: Support frame (1) is arranged at one end of a fixed pile, and a top plate (2) is arranged at the top of the support frame (1); two wing plates (3) are symmetrically arranged at the two sides of the top of the top plate (2); A mounting shell (4) is arranged in the support frame (1), and a jack (5) is arranged in the mounting shell (4); the output end of the jack (5) and the side of the mounting shell (4) away from the jack (5) are connected with an abutting block (6) through a connecting assembly; an arc-shaped groove is formed in each abutting block (6); a guide strip (7) is arranged on the side wall of the mounting shell (4); a guide groove (8) matched with the guide strip (7) is formed in the opposite side of each wing plate (3); the mounting shell (4) is slidably arranged between the two wing plates (3) through the guide strip (7); Two mounting rods (9) are arranged on the side of the stress pile away from the fixed pile; the two mounting rods (9) are connected through a plurality of connecting rods; a plurality of mounting plates (10) are arranged between the two mounting rods (9) along the length direction of the mounting rods (9) at equal intervals; a soil pressure meter (11) is arranged on the side of each mounting plate (10) away from the mounting rod (9) through a mounting assembly.

2. The device for checking the bearing capacity of soil mass behind pile according to claim 1, characterized in that, The mounting assembly comprises a plurality of limiting columns (12) arranged on the side of each mounting plate (10) facing the stress pile; an installation groove is formed in the end of each limiting column (12) away from the mounting plate (10); an L-shaped blocking rod (14) is connected in each installation groove through a spring (13).

3. The device for testing the bearing capacity of soil mass behind pile according to claim 2, characterized in that: A dial gauge (15) is arranged on the two mounting rods (9) through a horizontal plate (16).

4. The device for testing the bearing capacity of soil mass behind pile according to claim 1, characterized in that: A mounting block (17) is arranged at the top of each mounting rod (9); a screw rod (18) is arranged at the top of each mounting block (17); a through hole is formed in the horizontal plate (16) for the screw rod (18) to pass through; a nut (19) is screwed on each screw rod (18).

5. The device for testing the bearing capacity of soil mass behind pile according to claim 1, characterized in that: The connecting assembly comprises a connecting plate (20); one side of the connecting plate (20) is connected with the abutting block (6); two I-shaped steel (21) are arranged on the other side of the connecting plate (20) in a supporting manner.

6. The device for testing the bearing capacity of soil mass behind pile according to claim 5, characterized in that: The two I-shaped steel (21) are arranged on one side of the connecting plate (20) in a supporting manner.

7. The device for testing the bearing capacity of soil mass behind pile according to claim 1, characterized in that: A limiting block (22) is arranged on the outer wall of the abutting block (6); the limiting block (22) is slidably connected with the guide groove (8). The utility model relates to a soil pressure measuring device for stress pile, which comprises the following:

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