A pull-out testing connection device applicable to prestressed piles of any cross-section

Abstract

This utility model discloses a pull-out testing connection device applicable to prestressed piles of any cross-section, comprising a conversion grid, connecting screws, support blocks, a reaction beam, and jacks. Two support blocks are provided, distributed on both sides of the precast pile body. The reaction beam is mounted on top of the two support blocks, and a jack is installed on the reaction beam. An end plate is installed on the top of the precast pile. This utility model connects the pressure plate to the grid conversion connector via pull-out screws, pull-out nut, and washers. The grid conversion connector and pressure plate are then pressed onto the precast pile by screws, achieving a pull-out force transmission effect for pull-out testing. Rotating the grid connector as needed adjusts the angle between the precast pile body and the testing device, ensuring uniform force distribution at all positions on the pile head. Furthermore, the grid openings on the grid conversion connector are suitable for precast piles of various cross-sections. This improves the efficiency of pull-out pile testing, making the device easier to use and more versatile.

Description

Technical Field

[0001] This utility model belongs to the field of building construction technology, specifically relating to a pull-out testing connection device applicable to prestressed piles of any cross-section. Background Technology

[0002] With the rapid development of construction and bridge engineering in my country, the application of pile foundations is becoming increasingly widespread. In practical engineering, for anti-buoyancy buildings, the pull-out performance testing of pile foundations is one of the important steps in construction engineering design and acceptance.

[0003] Currently, the common method for testing the pull-out resistance of pile foundations involves breaking the pile head and then connecting the precast pile steel bar to the pressure plate above the jack of the testing frame using reinforcing bars. However, the horizontal steel plate shims of this pile foundation pull-out performance testing device are welded to the precast pile. This requires welding steel plate shims to each pile, which wastes materials, reduces work efficiency, and makes it impossible to ensure uniform stress on the connecting reinforcing bars during the welding process. Stress analysis of the pile foundation under inclined load tension cannot be tested. While there are alternative methods using specialized connectors, these require customization and are unsuitable for testing piles with different cross-sections, necessitating the fabrication of separate connectors. Therefore, the overall structure needs improvement.

[0004] Therefore, it is necessary to research and develop a pull-out testing connection device applicable to prestressed piles of any cross-section to solve the above problems. Utility Model Content

[0005] To address the aforementioned technical problems, this utility model provides a pull-out testing connection device applicable to prestressed piles of any cross-section, thereby solving the problems of waste of steel materials used in connections, low device applicability, low construction efficiency, limited construction dimensions, and uneven stress leading to pile head bursting in the prior art.

[0006] The present invention provides the following technical solution: A pull-out testing connection device applicable to prestressed piles of any cross-section includes support blocks, a reaction beam, and jacks. Two support blocks are positioned on either side of the precast pile body. The reaction beam is mounted on the top of the two support blocks, and a jack is mounted on the reaction beam. A screw rod is installed in the screw holes within the precast pile and its top end plate. A locking nut is threaded onto the external thread section of the screw rod. A grid conversion connector is installed on the top of the precast pile body, and a steel plate gasket is placed above the grid conversion connector. The screw rod extends to the top of the grid conversion connector and passes through the steel plate gasket. The grid conversion connector and the steel plate gasket are pressed against the precast pile body by the locking nut. The output end of the jack is connected to a top pressure plate, and an anti-pull-out screw is threaded through and connected to the pressure plate. Both ends of the anti-pull-out screw are threaded with anti-pull-out nuts. The two anti-pull-out nuts are located at the upper part of the pressure plate and the bottom of the grid conversion connector, respectively. Gaskets are provided between the grid conversion connector, the pressure plate and the anti-pull-out nuts.

[0007] Preferably, the upper surface of the precast pile body is provided with a pile top end plate, and the steel plate gasket and the grid conversion connector are distributed parallel to the pile top end plate.

[0008] Preferably, the number of anti-pull-out screws is set to four, and the four anti-pull-out screws are distributed in parallel and evenly distributed at the four corners of the pressure plate.

[0009] Preferably, the screw is matched with the pre-set bolt hole on the surface of the top end plate of the precast pile. The screw is connected by screwing into the pre-reserved bolt hole on the top end plate of the precast pile. The number of screws matches the number of pre-reserved bolt holes on the top end plate of the precast pile. The inner side of the grid conversion connector is provided with multiple grid holes. The screw and four anti-pull-out screws pass through the corresponding grid holes respectively.

[0010] Preferably, the outer diameter area of ​​the gasket is larger than the inner diameter area of ​​a single grid hole, and both the pull-out rod nut and the gasket are located on the outside of the precast pile body.

[0011] Preferably, the number of screws is set to multiple, and the surface of the steel plate gasket has circular holes that are the same number as the number of screws. The diameter of the circular holes is slightly larger than that of the screws so that the screws can pass through.

[0012] Preferably, the grid conversion connector includes an outer frame and an inner grid plate, and the outer frame and the inner grid plate are welded together. The grid conversion connector is planar on the top and bottom, and the screws pass through the corresponding grid holes, with the inner diameter of the grid hole being the diameter of the screw.

[0013] Preferably, the bottom end of the jack rests directly on the reaction beam, the pressure plate rests on the hydraulic jack, and the connecting end of the jack is provided with a hydraulic drive mechanism.

[0014] Preferably, the gasket is movably sleeved on the outside of the anti-pull-out screw, and the screw, gasket, steel plate gasket, end plate, and grid conversion connector are all made of solid metal.

[0015] Compared with the prior art, this utility model has the following advantages: The precast pile is connected to the grid conversion component via screws, nuts, and steel plate washers. Then, the pressure plate is connected to the grid conversion connector via anti-pull-out screws, anti-pull-out rod nuts, and washers. The grid conversion connector and pressure plate are then tightened onto the precast pile body using locking nuts, achieving the effect of transmitting pull-out force for pull-out testing. Rotating the grid-shaped connector as needed adjusts the angle between the precast pile body and the testing device, ensuring uniform force distribution across the pile head. The grid conversion connector is suitable for precast piles of various cross-sections. This solves the problems of wasteful steel materials in existing technologies, low device applicability, low construction efficiency, limited construction dimensions, and uneven force leading to pile head breakage.

[0016] This device is easy to assemble and disassemble, which improves its stability during use, reduces limitations, reduces steel waste, improves the efficiency of pull-out pile testing, makes the device easier to use, expands its application scope, and facilitates its widespread use. Compared with the traditional one-time investment in welding or special connectors, this device expands its application scope, thereby increasing the reusability rate. It also makes it easier for workers to install and remove the pull-out connectors, increasing its practicality. Attached Figure Description

[0017] Figure 1 A schematic diagram of the installation structure of the pull-out detection connection device and the precast pile body provided by this utility model.

[0018] Figure 2 This is a top view of the combined state of the steel plate gasket and the mesh conversion connector in this utility model.

[0019] Figure 3 This is a perspective view of the mesh conversion connector in this utility model.

[0020] Marked in the image: 1. Screw; 2. Anti-pull rod nut; 3. Washer; 4. Steel plate washer; 5. Lock nut; 6. Grid conversion connector; 7. Anti-pull threaded rod; 8. Support block; 9. Reaction beam; 10. Jack; 11. Pressure plate; 12. Nut; 13. End plate; 61. Outer frame; 62. Internal grid panel; 63. Mesh holes. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0023] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "connected," etc., should be interpreted broadly. For example, "connection" can refer to a detachable connection: it can be a mechanical connection; it can also be an indirect connection through an intermediate medium, or it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0024] like Figure 1-3 The device shown is a pull-out testing connection device applicable to prestressed piles of any cross-section, including support blocks 8, reaction beams 9, and jacks 10. Two support blocks 8 are provided, distributed on both sides of the precast pile body. The reaction beam 9 is mounted on top of the two support blocks 8, and jacks 10 are installed on the reaction beam 9. A screw rod 1 is installed in the screw holes within the precast pile and its top end plate 13. The screw rod 1 is mechanically connected to the bolt holes on the top end plate 13. A locking nut 5 is connected to a steel plate pad 4 at the top of the precast pile. A grid conversion connector 6 is provided at the top of the precast pile, and a steel plate pad 4 is placed above the grid conversion connector 6. The steel plate pad 4 can be made as a single piece of metal or as multiple separate metal plates. A circular through hole slightly larger than the screw rod 1 is opened on the steel plate pad 4, penetrating the steel plate pad 4. The screw 1 extends to the top of the grid conversion connector 6 and passes through the steel plate gasket 4. The grid conversion connector 6 and the steel plate gasket 4 are pressed together at the top of the precast pile by the locking nut 5. Both the grid conversion connector 6 and the steel plate gasket 4 are designed to be detachable. The screw 1 is inserted into the circular through hole to connect the steel plate gasket 4 and the top plate 13 of the precast pile, which can be easily assembled and disassembled, and can also play a role in force transmission and adjusting the average force. In addition, the grid connector 6 can adjust the angle of the precast pile body and the detection device, so that the force is evenly distributed at all positions of the pile head of the precast pile body. Its grid holes can be used for precast piles with various cross-sections.

[0025] The output end of the jack 10 is connected to a pressure plate 11. A pull-out nut 7 is threaded through and threaded onto the pressure plate 11. The top of the pull-out nut 7 is connected to a pull-out nut 2, and the bottom outer end of the pull-out nut 7 is threaded with a pull-out nut 2. The pull-out nut 2 is located at the bottom of the grid conversion connector 6, and a washer 3 is provided between the grid conversion connector 6 and the pull-out nut 2. The pull-out nut 7 is a continuous long thread pull-out nut. It is connected to the grid conversion connector 6 in conjunction with the corresponding pull-out nut 2, connecting the upper part of the pull-out nut 7 to the pressure plate 11 to transmit tensile force. The grid conversion connector 6 is connected to the precast pile body through a steel plate washer 4, a screw 1, and a locking nut 5. The precast pile body is connected to the pressure plate 11 through the screw 1, steel plate washer 4, grid conversion connector 6, and pull-out nut 7, achieving the effect of transmitting pull-out force and thus performing pull-out testing.

[0026] Specifically, in the above technical solution, a steel end plate 13 is provided on the upper surface of the precast pile body, and the steel plate gasket 4 and the grid conversion connector 6 are both distributed parallel to the end plate 13. This is beneficial for balancing the traction force and ensuring the accuracy of pull-out test.

[0027] Specifically, in the above technical solution, the number of anti-pull-out screws 7 is set to four, and the four anti-pull-out screws 7 are distributed in parallel and evenly distributed at the four corners of the pressure plate 11. The screw 1 is mechanically connected to the top end plate 13 of the precast pile through reserved bolt holes. The grid conversion connector 6 is provided with grid holes 63, and the screw 1 and the four anti-pull-out screws 7 pass through the corresponding grid holes 63 respectively. This is conducive to uniform force distribution and keeps the traction force balanced.

[0028] Specifically, in the above technical solution, the outer diameter area of ​​the gasket 3 is larger than the inner diameter area of ​​a single grid hole 63, and both the pull-out rod nut 2 and the gasket 3 are located on the outside of the precast pile body. This ensures that there is no motion interference during the operation of the device.

[0029] Specifically, in the above technical solution, the number of screws 1 is set to be multiple, corresponding one-to-one with the reserved bolt holes on the top plate 13 of the precast pile, and the surface of the steel plate gasket 4 is provided with circular holes distributed one-to-one with the screws 1, the diameter of the holes being smaller than the outer diameter of the locking nut 5.

[0030] Specifically, in the above technical solution, the grid conversion connector 6 includes an outer frame 61 and an inner grid plate 62, and the outer frame 61 and the inner grid plate 62 are welded together. The inner grid plate 62 has a grid hole 63 in its center, and multiple screws 1 and anti-pull-out rods 7 are inserted into the corresponding grid holes 63. The inner diameter of the grid hole 63 is larger than the diameter of the screws 1 and anti-pull-out rods 7. The screws 1 and anti-pull-out rods 7 can move within the grid hole 63, thereby facilitating the adjustment of the angles of the precast pile body and the testing device.

[0031] As an optional embodiment, the upper surface of the internal grating plate 62 is provided with a slot, and the steel plate gasket 4 is embedded in the steel plate gasket 4. This facilitates the positioning and installation of the steel plate gasket 4, improving its stability after installation.

[0032] Specifically, in the above technical solution, the bottom end of the jack 10 is detachably connected to the reaction beam 9 via a suction cup, and the output end of the jack 10 is detachably connected to the center point of the pressure plate 11. A hydraulic drive mechanism is provided at the connection end of the jack 10. The output length of the output end of the jack 10 can be adjusted via the hydraulic drive mechanism.

[0033] A pressure sensor is installed at the connection between the output end of the jack 10 and the pressure plate 11. This pressure sensor can be connected to an external display. Through the pressure sensor and the display, the pressure applied by the jack 10 to the pressure plate 11, i.e. the lifting force on the precast pile body and its internal screw 1, can be displayed on the display in real time, which is convenient for staff to observe.

[0034] Specifically, in the above technical solution, the gasket 3 is movably sleeved on the outside of the anti-pull-out threaded rod 7, and the gasket 3, the grid conversion connector 6, the steel plate gasket 4 and the pile top plate 13 are all made of solid metal.

[0035] When using the pull-out detection connection device provided by this utility model, the cement on the top of the precast pile body is removed and cleaned to expose the pile top end plate 13. The pre-reserved bolt holes of the pile top end plate 13 are cleaned, and the corresponding screw 1 is screwed into the bolt holes of the end plate 13. The grid conversion connector 6 and steel plate gasket 4 are arranged in sequence above the pile top end plate 13, and the locking nut 5 is used to lock them to connect with the precast pile body. Support blocks 8 are arranged on both sides of the precast pile body, and reaction beams 9 are erected on them. Jacks 10 are further added, and pressure plates 11 are installed at the output end. The pressure plates 11 are connected to the grid conversion connectors 6 through anti-pull-out screws 7, anti-pull-out screw nuts 2 and washers 3, so as to achieve the effect of transmitting anti-pull-out force and thus carry out anti-pull-out testing. The angle of the precast pile body and the testing device can be adjusted by adjusting the grid connectors 6, screws 1 and nuts 12 as needed, so that the force on each position of the pile head of the precast pile body is uniform, and it is applicable to precast piles with various cross sections. During testing, the output length of the jack 10 is adjusted by the hydraulic drive mechanism, which drives the pressure plate 11 and the grid conversion connector 6 to pull upward, thereby testing the pull-out resistance of the precast pile.

[0036] The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the specific details of the above embodiments. Within the scope of the technical concept of the present invention, various equivalent transformations can be made to the technical solutions of the present invention, and all such equivalent transformations fall within the protection scope of the present invention.

Claims

1. A pull-out testing connection device applicable to prestressed piles of any cross-section, comprising support blocks (8), reaction beams (9), and jacks (10), wherein the number of support blocks (8) is set to two, and the two support blocks (8) are distributed on both sides of the precast pile body, the reaction beams (9) are erected on the top of the two support blocks (8), and jacks (10) are provided on the reaction beams (9), characterized in that: A screw rod (1) is provided in the screw hole of the precast pile and its top end plate (13). A locking nut (5) is threaded to the external thread section of the screw rod (1). A grid conversion connector (6) is provided on the top of the precast pile body. A steel plate gasket (4) is provided above the grid conversion connector (6). The screw rod (1) extends to the top of the grid conversion connector (6) and passes through the steel plate gasket (4). The grid conversion connector (6) and the steel plate gasket (4) are pressed onto the precast pile body by the locking nut (5). The output end of the jack (10) is connected to a top pressure plate (11). A pull-out rod (7) is threaded through and connected to the pressure plate (11). Pull-out rod nuts (2) are threaded onto both ends of the pull-out rod (7). The two pull-out rod nuts (2) are located on the upper part of the pressure plate (11) and the bottom of the grid conversion connector (6), respectively. Gaskets (3) are provided between the grid conversion connector (6), the pressure plate (11), and the pull-out rod nuts (2).

2. The uplift detection connecting device of the prestressed pile with arbitrary cross section according to claim 1, characterized in that, The upper surface of the precast pile body is provided with a steel end plate (13), and the steel plate gasket (4) and the grid conversion connector (6) are distributed parallel to the end plate (13).

3. The uplift detection connecting device of the prestressed pile with arbitrary cross section according to claim 1, characterized in that, The number of anti-pull-out screws (7) is set to four, and the four anti-pull-out screws (7) are distributed in parallel and evenly distributed at the four corners of the pressure plate (11).

4. The uplift detection connecting device of the prestressed pile with arbitrary cross section according to claim 3, characterized in that, The screw (1) matches the pre-set bolt hole on the surface of the top end plate (13) of the precast pile. The screw (1) is connected by screwing into the pre-reserved bolt hole on the top end plate (13) of the precast pile. The number of screws (1) matches the pre-reserved bolt hole on the top end plate (13) of the precast pile. The inner side of the grid conversion connector (6) is provided with multiple grid holes (63). The screw (1) and four anti-pull-out screws (7) pass through the corresponding grid holes (63) respectively.

5. The uplift detection connecting device of the prestressed pile with arbitrary cross section according to claim 4, characterized in that, The outer diameter area of ​​the gasket (3) is larger than the inner diameter area of ​​a single grid hole (63), and both the pull rod nut (2) and the gasket (3) are located on the outside of the precast pile body.

6. The uplift detection connecting device of the prestressed pile with arbitrary cross section according to claim 1, characterized in that, The number of screws (1) is set to be multiple, the same as the number of bolt holes reserved in the precast pile end plate (13), and the steel plate gasket (4) has bolt holes that correspond one-to-one with the screws (1) and the precast pile end plate (13).

7. The uplift detection connecting device of the prestressed pile with arbitrary cross section according to claim 3, characterized in that, The grid conversion connector (6) includes an outer frame (61) and an inner grid plate (62), and the outer frame (61) and the inner grid plate (62) are welded together.

8. The pull-out testing connection device applicable to prestressed piles of any cross-section according to claim 1, characterized in that, The bottom end of the jack (10) is detachably connected to the reaction beam (9) via a suction cup. The output end of the jack (10) is detachably connected to the center point of the pressure plate (11). The connection end of the jack (10) is equipped with a hydraulic drive mechanism.

9. The uplift detection connecting device of the prestressed pile with arbitrary cross section according to claim 2, characterized in that, The gasket (3) is movably sleeved on the outside of the anti-pull screw (7), and the gasket (3), steel plate gasket (4), grid conversion connector (6), screw (1) and end plate (13) are all made of solid metal.

Images