Mechanical connecting device for pull-out test of precast pile
By using positioning and fastening devices in the precast pile pull-out test, the problem of the bearing plate tilting at the top of the jack was solved, ensuring the stability of the test and the service life of the device.
Patent Information
- Application Number
- CN202423270695.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-30
- Publication Date
- 2025-12-09
- Estimated Expiration
- 2034-12-30
AI Technical Summary
In existing technologies, the mechanical connection device of precast piles is prone to tilting when the bearing plate is placed at the top of the jack, which affects the test results and the stability of the device.
A mechanical connection device including a first pressure plate, a second pressure plate, and a high-strength screw is adopted. Through positioning devices, fastening devices, and diagonal braces, the displacement of the pressure plate is restricted, ensuring the stability of the connection.
This effectively prevents the bearing plate from shifting at the top of the jack, improves the stability and efficiency of the precast pile pull-out test, and extends the service life of the device.
Smart Images
Figure CN223647106U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of precast pile pull-out test technology, specifically a mechanical connection device for precast pile pull-out test. Background Technology
[0002] Currently, static pull-out load testing is a recognized and optimal testing method for determining the vertical pull-out bearing capacity of a single pile. Traditional static pull-out load testing generally employs a pre-cast core-welding / anchoring method. This method requires pre-fabricating and pouring a reinforcing cage, and after the concrete reaches its strength, the static pull-out load test is conducted by welding or anchoring using a core jack. This method involves cumbersome preparation, a long cycle, and high costs.
[0003] Existing technology connects precast piles and jacks using high-strength bolts and two bearing plates, which can directly provide reaction force for pull-out tests. It is easy to disassemble, can be reused, and saves time and costs while greatly improving work efficiency.
[0004] However, in actual use, since the bearing plate is placed directly on top of the jack and there is no connection between them, when the jack applies pressure to the bottom of the bearing plate to control the bearing plate, the bearing plate located above the jack may become tilted when the high-strength screw pulls the bearing plate and the precast pile below, which may affect the test results of the pull-out test of the precast pile and the stability of the mechanical connection device during use. Utility Model Content
[0005] To overcome the aforementioned deficiencies of the prior art, this utility model provides a mechanical connection device for precast pile pull-out tests. This solves the problem that, since the bearing plate is placed directly on top of the jack without any connection to it, the pressure applied by the jack to the bottom of the bearing plate to control it, when the high-strength screw pulls the bearing plate and the precast pile below, may cause the bearing plate above the jack to tilt, affecting the test results of the precast pile pull-out test and the stability of the mechanical connection device during use.
[0006] To achieve the above objectives, this utility model provides the following technical solution: a mechanical connection device for pull-out tests of precast piles, comprising a first bearing plate, a second bearing plate, and a plurality of high-strength screws. The outer surfaces of the first and second bearing plates are provided with a plurality of slots. The outer surfaces of the high-strength screws are threaded with a plurality of threaded rings. A jack is provided on one side of the first bearing plate, and a bearing beam is provided at the bottom end of the jack. Supports are provided on both sides of the bottom end of the bearing beam. A precast pile is provided on one side of the outer surface of each support. The top of the first pressure plate is connected to the second pressure plate by high-strength bolts. The bottom of the first pressure plate is provided with a positioning device, which includes two grooved rods. The top of the grooved rods is fixedly connected to the bottom of the first pressure plate. The inner walls of the two grooved rods are slidably connected with sliding rods. The bottom of the sliding rods is fixedly connected with a ring. The inner walls of the rings are threaded with first screws on both sides. One end of the first screw is rotatably connected to an arc-shaped plate. The top of the arc-shaped plate is fixedly connected with an L-shaped rod. The outer surface of the L-shaped rod slides on the inner wall of the sliding rod.
[0007] As a further embodiment of this utility model: a plurality of protruding strips are fixedly connected to the side of the arc-shaped plate away from the first screw, and the protruding strips are rubber strips made of rubber material.
[0008] As a further embodiment of this utility model: diagonal rods are fixedly connected to both sides of the sliding rod, and the end of the diagonal rod away from the sliding rod is fixedly connected to the top of the ring.
[0009] As a further embodiment of this utility model: a disc is fixedly connected to one end of the first screw away from the arc-shaped plate, and a handle is rotatably connected to one side of the disc.
[0010] As a further embodiment of this utility model: the outer surfaces of the first pressure plate and the second pressure plate are provided with fastening devices, the fastening devices include U-shaped rods, and several rectangular grooves are respectively opened on both sides of the first pressure plate and the second pressure plate.
[0011] As a further embodiment of this utility model: one end of the U-shaped rod is fixedly connected to a pull rod, and the cross-sectional shape of the pull rod is U-shaped.
[0012] As a further embodiment of this utility model: both ends of the U-shaped rod are respectively fixedly connected with protrusions, and the protrusions are made of rubber material.
[0013] Compared with the prior art, the beneficial effects of this utility model are as follows: 1. The mechanical connection device for the pull-out test of precast piles, by setting a positioning device, allows the first bearing plate to shift upward during the pull-out test of the precast pile body. The groove rod will slide on the outer surface of the sliding rod. The groove rod, sliding rod and ring can further limit the angle between the jack and the first bearing plate, so as to avoid the first bearing plate from shifting at the top of the jack and affecting the test process.
[0014] 2. The mechanical connection device used for the pull-out test of precast piles can strengthen the connection between the sliding rod and the ring by setting diagonal bars, so as to avoid the breakage at the connection between the sliding rod and the ring as much as possible and improve the service life of the positioning device.
[0015] 3. The mechanical connection device used for pull-out tests of precast piles, by setting a fastening device, seals the slots on both sides of the first and second bearing plates through the two ends of the U-shaped rod, further restricting the position of the high-strength screw on one side of the first and second bearing plates, thereby improving the stability of the mechanical connection device during use. Attached Figure Description
[0016] Figure 1 This is a three-dimensional structural diagram of the present invention.
[0017] Figure 2 This is a structural schematic diagram of the pressure-bearing beam of this utility model.
[0018] Figure 3 This is a schematic diagram of the structure of the circular part of this utility model.
[0019] Figure 4 This is a schematic diagram of the structure of the U-shaped rod of this utility model.
[0020] In the diagram: 1. Precast pile; 2. Positioning device; 3. Fastening device; 4. Support; 5. Bearing beam; 6. Jack; 7. First bearing plate; 8. Second bearing plate; 9. High-strength bolt; 10. High-strength screw; 11. Threaded ring; 21. Grooved rod; 22. Sliding rod; 23. Circular ring; 24. First screw; 25. Arc plate; 26. L-shaped rod; 27. Protruding strip; 28. Diagonal rod; 29. Disc; 210. Holding rod; 31. Rectangular groove; 32. U-shaped rod; 33. Tie rod; 34. Protrusion. Detailed Implementation
[0021] The technical solution of this patent will be further described in detail below with reference to specific embodiments.
[0022] like Figure 1-3As shown, this utility model provides a technical solution: a mechanical connection device for pull-out tests of precast piles, comprising a first bearing plate 7, a second bearing plate 8, and several high-strength screws 10. Several slots are formed on the outer edges of the first and second bearing plates 7 and 8. Several threaded rings 11 are threaded onto the outer surfaces of the high-strength screws 10. A jack 6 is provided on one side of the first bearing plate 7, a bearing beam 5 is provided at the bottom of the jack 6, and supports 4 are provided on both sides of the bottom of the bearing beam 5. A precast pile 1 is provided on one side of the outer surface of the supports 4. The top of the precast pile 1 is connected to the second bearing plate 8 by high-strength bolts 9. A positioning device 2 is provided at the bottom of the first bearing plate 7, and the positioning device 2 includes two grooved rods 21. The top end of the groove rod 21 is fixedly connected to the bottom end of the first bearing plate 7. Sliding rods 22 are slidably connected to the inner walls of the two groove rods 21 respectively. A ring 23 is fixedly connected to the bottom end of the sliding rod 22. First screws 24 are threadedly connected to both sides of the inner wall of the ring 23. An arc-shaped plate 25 is rotatably connected to one end of the first screw 24. An L-shaped rod 26 is fixedly connected to the top end of the arc-shaped plate 25. The outer surface of the L-shaped rod 26 slides on the inner wall of the sliding rod 22. By setting the ring 23, when using a mechanical connection device to assist in the pull-out test of the precast pile 1, the second bearing plate 8 is first placed on the top of the precast pile 1, and high-strength bolts 9 are used to connect the second bearing plate 8 to the precast pile 1. Then, the bearing beam 5 is placed on both sides of the precast pile 1. On the two side supports 4, place the jack 6 in the middle of the top of the pressure beam 5. Finally, place the first pressure plate 7 on the top of the jack 6 and align it with the position of the second pressure plate 8. Rotate the first screw 24 on both sides of the ring 23 to control the movement of the first screw 24 on the inner wall of the ring 23 to push the arc plate 25, so that the L-shaped rod 26 at the top of the arc plate 25 slides on the inner wall of the sliding rod 22, pressing one side of the arc plate 25 against the outer surface of the jack 6 to fix the position between the ring 23 and the jack 6. Then, place the high-strength screw 10 in the slots on both sides of the outer surface of the first pressure plate 7 and the second pressure plate 8, and use the threaded ring 11 to fit on the outer surface of the high-strength screw 10. The movement of the outer surface presses the threaded ring 11 against the outer surfaces of the first bearing plate 7 and the second bearing plate 8, fixing the position of the high-strength screw 10 between the first bearing plate 7 and the second bearing plate 8. The jack 6 applies an upward force to the first bearing plate 7, and the high-strength screw 10 drives the second bearing plate 8 to apply an upward pull-out force to the precast pile 1, conducting a pull-out test on the precast pile 1. During the test, the first bearing plate 7 shifts upward, and the groove rod 21 slides on the outer surface of the sliding rod 22. The groove rod 21, the sliding rod 22, and the ring 23 can further limit the angle between the jack 6 and the first bearing plate 7, minimizing the displacement of the first bearing plate 7 at the top of the jack 6, which would affect the test process.
[0023] Specifically, such as Figure 2 and Figure 3As shown, a number of protruding strips 27 are fixedly connected to the side of the arc plate 25 away from the first screw 24. The protruding strips 27 are rubber strips. When the side of the arc plate 25 with the rubber protruding strips 27 is pressed against the outer surface of the jack 6 to restrict the position between the ring 23 and the jack 6, it is more stable and the arc plate 25 is less likely to slide accidentally. The two sides of the sliding rod 22 are respectively fixedly connected with inclined rods 28. The end of the inclined rod 28 away from the sliding rod 22 is fixedly connected to the top of the ring 23. By setting the inclined rods 28, the connection between the sliding rod 22 and the ring 23 can be reinforced, and the breakage at the connection between the sliding rod 22 and the ring 23 can be avoided as much as possible, thereby improving the service life of the positioning device 2.
[0024] Specifically, such as Figure 2 and Figure 3 As shown, a disc 29 is fixedly connected to the end of the first screw 24 away from the arc plate 25. A handle 210 is rotatably connected to one side of the disc 29. By holding the outer surface of the handle 210 and pushing the disc 29, the first screw 24 can be rotated more conveniently to adjust the position of the arc plate 25.
[0025] Specifically, such as Figure 1 , Figure 3 and Figure 4 As shown, fastening devices 3 are provided on the outer surfaces of the first bearing plate 7 and the second bearing plate 8. The fastening device 3 includes a U-shaped rod 32. Several rectangular slots 31 are respectively opened on both sides of the first bearing plate 7 and the second bearing plate 8. When the precast pile pull-out test is carried out, after the mechanical connection device is installed, the two ends of the U-shaped rod 32 can be passed through the rectangular slots 31 on both sides of the outer surfaces of the first bearing plate 7 and the second bearing plate 8 at one end, so that the two ends of the U-shaped rod 32 are closed at the slots on both sides of the first bearing plate 7 and the second bearing plate 8, further restricting the position of the high-strength screw 10 on one side of the first bearing plate 7 and the second bearing plate 8, and improving the stability of the mechanical connection device during use. After the test is completed, the two ends of the U-shaped rod 32 can be pulled out from the inside of the rectangular slots 31 by pulling the U-shaped rod 32.
[0026] Specifically, such as Figure 3 and Figure 4As shown, a pull rod 33 is fixedly connected to one end of the U-shaped rod 32. The pull rod 33 has a U-shaped cross-section. Holding the pull rod 33 on its outer surface makes it easier to control the U-shaped rod 32 for assembly and disassembly. Both ends of the U-shaped rod 32 are fixedly connected to protrusions 34, which are made of rubber. When the two ends of the U-shaped rod 32 pass through the rectangular groove 31, they will squeeze the rubber protrusions 34, causing them to deform. After the two ends of the U-shaped rod 32 pass through one end of the first pressure plate 7 or the second pressure plate 8, the two rubber protrusions 34 will be located on one side of the outer surface of the first pressure plate 7 or the second pressure plate 8, further restricting the position of the U-shaped rod 32 on one side of the first pressure plate 7 or the second pressure plate 8, and minimizing the risk of the U-shaped rod 32 accidentally falling off.
[0027] The working principle of this utility model is as follows: S1. When using a mechanical connection device to assist in the pull-out test of the precast pile body 1, first place the second bearing plate 8 at the top of the precast pile body 1, and use high-strength bolts 9 to connect the second bearing plate 8 to the precast pile body 1. Then, place the bearing beam 5 on the two supports 4 on both sides of the precast pile body 1, and then place the jack 6 at the middle position of the top of the bearing beam 5. Finally, place the first bearing plate 7 at the top of the jack 6 and align it with the position of the second bearing plate 8. Rotate the first screw 24 on both sides of the ring 23 to control the first screw 24 to move and push the arc plate 25 on the inner wall of the ring 23, so that the L-shaped rod 26 at the top of the arc plate 25 slides on the inner wall of the sliding rod 22, pressing one side of the arc plate 25 against the outer surface of the jack 6, and then press the ring 23 and the jack 6 together. The position between the top 6 is fixed, and then a high-strength screw 10 is placed in the slots on both sides of the outer surface of the first pressure plate 7 and the second pressure plate 8. A threaded ring 11 is fitted onto the outer surface of the high-strength screw 10 and moved on the outer surface of the high-strength screw 10 to press the threaded ring 11 against the outer surface of the first pressure plate 7 and the second pressure plate 8, thus fixing the position between the high-strength screw 10 and the first pressure plate 7 and the second pressure plate 8. Then, the two ends of the U-shaped rod 32 are passed through the rectangular grooves 31 on both sides of the outer surface of the first pressure plate 7 and the second pressure plate 8 at one end of each plate, so that the two ends of the U-shaped rod 32 are closed to the slots on both sides of the first pressure plate 7 and the second pressure plate 8, further restricting the position of the high-strength screw 10 on one side of the first pressure plate 7 and the second pressure plate 8.
[0028] S2. The jack 6 applies an upward force to the first bearing plate 7, and the high-strength screw 10 drives the second bearing plate 8 to apply an upward pull-out force to the precast pile 1. A pull-out test is conducted on the precast pile 1. During the test, the first bearing plate 7 shifts upward, and the groove rod 21 slides on the outer surface of the sliding rod 22. The groove rod 21, the sliding rod 22, and the ring 23 can further limit the angle between the jack 6 and the first bearing plate 7, and minimize the impact of the first bearing plate 7 on the top of the jack 6. After the displacement test is completed, pull the U-shaped rod 32 to pull both ends of the U-shaped rod 32 out of the rectangular groove 31. Rotate the two first screws 24 to control the arc plate 25 away from the outer surface of the jack 6. Rotate the threaded ring 11 on the outer surface of the high-strength screw 10 to make the threaded ring 11 away from the outer surface of the first bearing plate 7 and the second bearing plate 8. Remove the first bearing plate 7, then remove the high-strength screw 10. Rotate the high-strength bolt 9 to disconnect the connection between the second bearing plate 8 and the precast pile body 1. Remove the second bearing plate 8.
[0029] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of 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.
[0030] The preferred embodiments of this patent have been described in detail above. However, this patent is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of this patent.
Claims
1. A mechanical connection device for pull-out testing of precast piles, comprising a first bearing plate (7), a second bearing plate (8), and a plurality of high-strength bolts (10), characterized in that: Several slots are provided on the outer surface edges of the first bearing plate (7) and the second bearing plate (8). Several threaded rings (11) are threaded onto the outer surface of the high-strength screw (10). A jack (6) is provided on one side of the first bearing plate (7). A bearing beam (5) is provided at the bottom end of the jack (6). Supports (4) are provided on both sides of the bottom end of the bearing beam (5). A precast pile (1) is provided on one side of the outer surface of the support (4). The top of the precast pile (1) is connected to the second bearing plate (8) by a high-strength bolt (9). A positioning device (2) is provided at the bottom end of the first bearing plate (7). The positioning device (2) includes two grooved rods (21). The top end of the grooved rod (21) is fixedly connected to the bottom end of the first pressure plate (7). The inner walls of the two grooved rods (21) are respectively slidably connected to sliding rods (22). The bottom end of the sliding rod (22) is fixedly connected to a ring (23). The inner walls of the ring (23) are respectively threaded with first screws (24). One end of the first screw (24) is rotatably connected to an arc plate (25). The top end of the arc plate (25) is fixedly connected to an L-shaped rod (26). The outer surface of the L-shaped rod (26) slides on the inner wall of the sliding rod (22).
2. The mechanical connection device for pull-out testing of precast piles according to claim 1, characterized in that: The arc plate (25) is fixedly connected to a number of protruding strips (27) on the side away from the first screw (24), and the protruding strips (27) are rubber strips made of rubber.
3. The mechanical connection device for pull-out testing of precast piles according to claim 2, characterized in that: The sliding rod (22) is fixedly connected to two sides of the inclined rod (28), and the end of the inclined rod (28) away from the sliding rod (22) is fixedly connected to the top of the ring (23).
4. The mechanical connection device for pull-out testing of precast piles according to claim 3, characterized in that: The first screw (24) is fixedly connected to a disc (29) at one end away from the arc plate (25), and a handle (210) is rotatably connected to one side of the disc (29).
5. A mechanical connection device for pull-out testing of precast piles according to claim 1, characterized in that: The outer surfaces of the first pressure plate (7) and the second pressure plate (8) are provided with fastening devices (3), the fastening devices (3) include U-shaped rods (32), and several rectangular grooves (31) are respectively opened on both sides of the first pressure plate (7) and the second pressure plate (8).
6. A mechanical connection device for pull-out testing of precast piles according to claim 5, characterized in that: One end of the U-shaped rod (32) is fixedly connected to a pull rod (33), and the cross-sectional shape of the pull rod (33) is U-shaped.
7. A mechanical connection device for pull-out testing of precast piles according to claim 6, characterized in that: The two ends of the U-shaped rod (32) are respectively fixedly connected to protrusions (34), which are made of rubber.