Device for measuring allowable bearing capacity of pile foundation

Abstract

The utility model relates to a pile foundation allowable bearing capacity measuring device, and relates to the technical field of pile foundation detection, the pile foundation allowable bearing capacity measuring device comprises two vertical frames, a pressure block and a limiting mechanism arranged on the two vertical frames, the sides, close to each other, of the two vertical frames are each provided with a sliding groove with a driving motor installed on the top wall, and an output shaft of each driving motor is connected with a driving screw; the two ends of the pressure bearing block are symmetrically connected with connecting plates provided with screw holes, the two connecting plates are in threaded connection with the two driving screws correspondingly, the two vertical frames are provided with first containing cavities internally provided with fluid, and a plurality of through holes communicating with the first containing cavities are formed in the bottom face of the sliding groove at equal intervals in a penetrating mode. Baffles are slidably connected to the positions, at the through holes, of the vertical frame, a contact assembly for controlling the baffles to slide is arranged on the connecting plate, a second containing cavity with the two ends communicating with the outside is formed in the pressure bearing block, and the bottom side of the second containing cavity is located below the connecting plate in the vertical direction. The measuring accuracy of the pile foundation allowable bearing capacity measuring device can be improved, and operation is easier and more convenient.

Description

Technical Field

[0001] This application relates to the field of pile foundation testing technology, and in particular to a device for determining the allowable bearing capacity of pile foundations. Background Technology

[0002] A deep foundation consisting of piles and a pile cap (or simply pile cap) connecting the pile tops, or a single-pile foundation connecting columns and piles, is simply called a pile foundation. Pile foundations are widely used in high-rise buildings. Testing the allowable bearing capacity of pile foundations is crucial for ensuring the safety and stability of buildings. Allowable bearing capacity refers to the maximum load capacity that a unit area of ​​the foundation can withstand; it reflects the strength and stability of the foundation. Insufficient allowable bearing capacity may lead to building settlement, tilting, or even collapse.

[0003] For example, a device for testing the bearing capacity of pile foundations in building engineering, patent number "CN219219135U", includes two I-shaped support frames. Two support plates are fixedly installed on the top of each of the two I-shaped support frames. Two connecting plates are fixedly installed between the two support plates. A sliding rod is fixedly installed between the two connecting plates. A slider slides through the outer walls of each sliding rod. A common movable box is fixedly installed between the two sliders. In this invention, a quantitative amount of weight can be added to the movable box, facilitating a clear and intuitive display of the bearing capacity of the tested pile foundation. After testing, the weight can be easily and quickly removed, facilitating the next test.

[0004] However, in practice, the allowable bearing capacity of pile foundations is often determined by the depth of sinking caused by the load under static conditions. But in this application, when a weight is added to the movable box, it falls into the box, generating a vertical impact force. Under this impact force, the movable box experiences a momentary force and shifts downwards, thus causing the test results to lose accuracy. Therefore, the aforementioned patent still has shortcomings. Utility Model Content

[0005] In order to improve the accuracy of pile foundation allowable bearing capacity testing and to optimize and improve the structure of the pile foundation bearing capacity testing device, this application provides a pile foundation allowable bearing capacity measuring device.

[0006] The pile foundation allowable bearing capacity measuring device provided in this application adopts the following technical solution:

[0007] A pile foundation allowable bearing capacity measuring device includes two opposing uprights, a bearing block slidably connected at both ends to the two uprights, and a limiting mechanism for lateral limiting of the pile foundation on the two uprights. Each of the two uprights has a groove on its top wall with a drive motor mounted thereon, and the output shaft of the drive motor is connected to a drive screw. The bearing block has connecting plates with threaded holes symmetrically connected at both ends. The two connecting plates are threadedly connected to the two drive screws. Each upright has a first receiving cavity containing fluid. The bottom surface of the groove has several through holes at equal intervals communicating with the first receiving cavity. Each upright has baffles slidably connected at several of the through holes. The connecting plates are provided with contact components to control the sliding of the baffles. The bearing block has a second receiving cavity with both ends communicating with the outside, and the bottom of the second receiving cavity is vertically located below the connecting plates.

[0008] Optionally, the contact assembly includes a contact block movably connected to one side of the connecting plate and a compression spring connected between the contact block and the connecting plate. The side wall of the connecting plate has a mounting hole. One side of the compression spring is connected to the bottom side of the mounting hole, and the contact block can be completely retracted into the mounting hole. The outer side walls of several baffles have mating holes, and the several mating holes are all matched with the size of the contact block.

[0009] Optionally, the contact block is a long strip structure and is arranged in a direction perpendicular to the connecting plate. Both sides of the contact block along the width direction are provided with rounded corners or chamfers.

[0010] Optionally, a guide groove is provided through the connecting plate, and the first and last ends of the guide groove correspond to a plurality of through holes and the inlet of the second receiving cavity, respectively.

[0011] Optionally, the second receiving cavity includes a left chamber and a right chamber with identical structures, the left chamber and the right chamber are separated from each other, and the left chamber and the right chamber are respectively connected to a return hose communicating with the two first receiving cavities near the bottom.

[0012] Optionally, the limiting mechanism includes two arc-shaped limiting plates symmetrically installed at the bottom of the two uprights, two cylinders respectively connected to the two limiting plates on opposite sides, and two push rods symmetrically installed on the two uprights. Each limiting plate includes arc plates located on both sides along the vertical direction and a connecting rod in the middle. Both arc plates are slidably engaged with the connecting rod. The output end of the push rod is connected to a push plate. A first connecting rod is hinged between each of the two arc plates and the push plate. The push plate and the two arc plates are always located on the same vertical plane.

[0013] Optionally, a positioning cone is slidably embedded at the bottom of both of the uprights, and a second connecting rod is hinged between the top of the positioning cone and the push plate. When the push rod drives the push plate to approach the arc plate, the positioning cone moves down and embeds itself into the ground.

[0014] Optionally, both of the uprights are equipped with casters at their bottoms. When the measuring device is not in operation, the casters are always located below the positioning cone.

[0015] In summary, this application includes at least one of the following beneficial technical effects:

[0016] This application replaces the weight-adding structure of the pile foundation allowable bearing capacity measuring device with a fluid. By relying on the characteristics of the fluid, the weight of the measuring device is gradually increased during pile foundation testing, thereby avoiding the deviation of the test results caused by the instantaneous impact force due to the sudden addition of weight, and improving the accuracy of the test results of the pile foundation allowable bearing capacity measuring device.

[0017] This application can automatically add weight-adding liquid into the connecting plate during the moving process. The operation is simple and the weight-adding liquid can be reused, so that the test results can be displayed more intuitively. At the same time, it makes the device more convenient to carry or move when it is not in operation, and it is more flexible.

[0018] This application improves the limiting mechanism of the pile foundation allowable bearing capacity measuring device, so that the pile foundation can always remain vertical during the test, and the device operates more stably, thereby further improving the accuracy of the device's test results and reducing errors. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of a pile foundation allowable bearing capacity measuring device according to this application.

[0020] Figure 2 yes Figure 1 Cross-sectional view at point AA.

[0021] Figure 3 This is an exploded view of the overall structure of a pile foundation allowable bearing capacity measuring device according to this application.

[0022] Figure 4 This is a side view of the single-sided support structure of a pile foundation allowable bearing capacity measuring device according to this application.

[0023] Figure 5 This is a structural view of the baffle of a pile foundation allowable bearing capacity measuring device according to this application.

[0024] Figure 6 This is a structural view of the bearing block of a pile foundation allowable bearing capacity measuring device according to this application.

[0025] Figure 7 This is an exploded view of the contact components of a pile foundation allowable bearing capacity measuring device according to this application.

[0026] Figure 8 This is an overall view of the limiting mechanism of a pile foundation allowable bearing capacity measuring device according to this application.

[0027] Explanation of reference numerals in the attached drawings: 1. Upright frame; 11. Slide groove; 12. Drive motor; 13. Screw; 14. First receiving cavity; 15. Through hole; 16. Baffle; 161. Slot; 162. Docking hole; 2. Pressure block; 21. Connecting plate; 211. Mounting hole; 212. Guide groove; 22. Second receiving cavity; 221. Left chamber; 222. Right chamber; 3. Limiting mechanism; 31. Limiting plate; 311. Connecting rod; 312. Arc plate; 32. Cylinder; 33. Push rod; 34. Push plate; 35. First connecting rod; 4. Contact assembly; 41. Contact block; 42. Compression spring; 5. Positioning cone; 51. Second connecting rod; 6. Caster wheel. Detailed Implementation

[0028] The following is in conjunction with the appendix Figure 1-8 This application will be described in further detail.

[0029] This application discloses a device for measuring the allowable bearing capacity of pile foundations.

[0030] Reference Figure 1 and Figure 2 A device for determining the allowable bearing capacity of a pile foundation includes two opposing uprights 1, a bearing block 2 slidably connected at both ends to the two uprights 1, and a limiting mechanism 3 mounted on the two uprights 1. The limiting mechanism 3 is used to laterally limit the pile foundation, ensuring it remains vertical during the measurement process and reducing errors. The bottom of the bearing block 2 abuts against the top side of the pile foundation. When the bearing block 2 moves downward, it compresses the pile foundation, thereby determining the allowable bearing capacity based on the degree of pile foundation subsidence.

[0031] Reference Figure 2 and Figure 3 Furthermore, neither side of the support frame 1 has a sliding groove 11, while the top of the sliding groove 11 is equipped with a drive motor 12. The drive motor 12 is connected to a screw 13, and the two ends of the pressure block 2 are slidably disposed within the two sliding grooves 11 and integrally connected with a connecting plate 21 through which a screw hole is opened. The connecting plates 21 at both ends of the pressure block 2 are threadedly connected to the two screws 13 through the screw holes respectively. When the two drive motors 12 operate synchronously, they can drive the pressure block 2 to move up and down, thereby compressing the pile foundation.

[0032] Reference Figure 2 and Figure 4Furthermore, each of the two uprights 1 has a first receiving cavity 14, and each of the two first receiving cavities 14 is filled with weight-enhancing liquid. The bottom surface of the slide 11 has several through holes 15 that are evenly spaced vertically and communicate with the first receiving cavities 14. At the positions of the several through holes 15, baffles 16 for closing the through holes 15 are slidably arranged vertically on the uprights 1. The connecting plate 21 is provided with a contact component 4 that can control the sliding of the several baffles 16 to open or close the several through holes 15, so that when the connecting plate 21 moves downward under the action of the drive motor 12, the several through holes 15 can be opened sequentially from top to bottom, and vice versa.

[0033] The bearing block 2 has a second receiving cavity 22 with both ends communicating with the outside, and the bottom side of the second receiving cavity 22 is located below the connecting plate 21 in the vertical direction. When the through hole 15 is opened, the weight-adding liquid in the first receiving cavity 14 will flow into the second receiving cavity 22, increasing the overall mass of the bearing block 2, so as to realize the pressing operation on the pile foundation.

[0034] Since the weight-adding material in this application is a fluid, it will not generate instantaneous impact force, thus preventing the instantaneous impact force from being transmitted to the pile foundation and affecting the accuracy of the final test. Furthermore, because the fluid flow rate is controllable, the test personnel can precisely control the overall weight of the connecting plate 21 during operation.

[0035] Reference Figure 5 Preferably, in this application, the baffle 16 has an I-shaped structure, that is, the baffle 16 has slots 161 on both sides along the width direction, and the two sides of the through hole 15 are engaged in the slots 161. At the same time, in order to prevent accidental water leakage during the use of this device, a water-proof rubber layer is laid on both sides of the baffle 16 inside the slots 161 and on the side of the baffle 16 near the first receiving cavity 14.

[0036] Since the water-resistant rubber layer is integrally connected to the baffle 16 and is not easily shown, it is not depicted in the accompanying drawings of this application. However, based on the above description, those skilled in the art can manufacture a baffle 16 with a water-resistant rubber layer, and therefore this innovative feature is also protected under this application.

[0037] Reference Figure 6 and Figure 7Specifically, the contact assembly 4 includes a contact block 41 movably connected to the side of the connecting plate 21 away from the pressure block 2, and a compression spring 42 fixedly connected to the end of the contact block 41 at one end. The connecting plate 21 has a mounting hole 211, and the other end of the compression spring 42 is fixedly connected to the bottom side of the mounting hole 211. When the connecting plate 21 slides within the slide groove 11, the contact block 41 can be completely retracted into the mounting hole 211. Several baffles 16 have mating holes 162 on their outer walls that match the size of the contact block 41. When the connecting plate 21 moves to the position of a certain baffle 16, the contact block 41 will enter the mating hole 162 under the action of the compression spring 42. Further movement of the connecting plate 21 will cause the contact block 41 to move along with the baffle 16, thus opening and closing the through hole 15.

[0038] Preferably, the contact block 41 has an elongated structure and is arranged in a direction perpendicular to the sliding direction of the connecting plate 21. This design allows for a larger contact area between the contact block 41 and the sidewall of the mating hole 162, ensuring the stability of the connection and allowing the connecting plate 21 to smoothly move the baffle 16. Both sides of the contact block 41 are provided with rounded corners or chamfers along its width. This allows the contact block 41 to separate from the baffle 16 after the baffle 16 moves to the upper and lower edges of the through hole 15, resulting in smoother device operation, ensuring the integrity of the component structure, and extending its service life.

[0039] Preferably, a guide groove 212 is provided through the upper end surface of the connecting plate 21, and the first and last ends of the guide groove 212 are flush with a plurality of through holes 15 and the second receiving cavity 22, respectively. The function of this structure is to prevent the fluid flowing out of the first receiving cavity 14 from having a height difference when entering the second receiving cavity 22, thereby further reducing the impact of fluid impact force on pile foundation testing and further improving the accuracy of pile foundation allowable bearing capacity determination.

[0040] Reference Figure 2 and Figure 6 Furthermore, the second receiving cavity 22 includes a left chamber 221 and a right chamber 222 with identical structure and dimensions, and the left chamber 221 and the right chamber 222 are not interconnected. Both the left chamber 221 and the right chamber 222 are connected to return hoses that are respectively connected to the two first receiving cavities 14. After the device completes the measurement, the pressure block 2 moves upward, causing the water level in the second receiving cavity 22 to be higher than the water level in the first receiving cavity 14. At this time, the weight-adding liquid will automatically flow back into the first receiving cavity 14, realizing the recovery and reuse of the weight-adding liquid.

[0041] It should be noted that, since the return hose is a flexible structure and its shape changes at any time during the movement of the pressure block 2, this technical feature is not shown in the accompanying drawings of this application. Those skilled in the art can determine the position and connection method of the return hose through the above description.

[0042] Reference Figure 2 and Figure 8 Specifically, the limiting mechanism 3 includes two limiting plates 31 symmetrically installed at the bottom of the two uprights 1, two cylinders 32 respectively connected to the opposite sides of the two limiting plates 31, and two push rods 33 symmetrically installed on the two uprights 1. The limiting plates 31 have an arc-shaped structure, which can form a stable clamping effect on the pile foundation when the two limiting plates 31 are symmetrically attached to the side wall of the pile foundation. The cylinders 32 are fixed on the uprights 1 and are used to drive the two limiting plates 31 to move laterally away from or towards each other.

[0043] Reference Figure 8 Furthermore, the limiting plate 31 includes a connecting rod 311 located vertically in the middle and two arc plates 312 symmetrically slidably disposed at both ends of the connecting rod 311. A push plate 34 is connected to the output end of the push rod 33. The two arc plates 312 are hinged to the push plate 34 by first connecting rods 35, and the push plate 34 and the two arc plates 312 are always located on the same vertical plane. When the push plate 34 pushes the push plate 34 to move, it can drive the two arc plates 312 to move closer or further apart in the vertical direction. This allows for two-stage clamping of piles of different lengths, improving the clamping effect on the piles and ensuring that the piles do not tilt during downward compression, thus ensuring the reliability of the measured structure.

[0044] Reference Figure 3 and Figure 8 Both uprights 1 have slidably fitted positioning cones 5 at their bottoms, and the tops of the positioning cones 5 are hinged to the push plate 34 via a second connecting rod 51. When the push rod 33 pushes the push plate 34 to move, it also causes the positioning cones 5 to move downwards, thereby fixing the uprights 1 to the ground. This structure can avoid the instability of the measuring device during pile foundation testing and eliminate the influence of accidental movement of the measuring device on the measurement results.

[0045] Both uprights 1 are equipped with casters 6 at their bottom to facilitate the rapid movement of the measuring device to a predetermined position. It should be noted that when the measuring device is not in operation, the casters 6 are always located below the positioning cone 5 to ensure that the positioning cone 5 does not affect the movement of the measuring device.

[0046] The implementation principle of the pile foundation allowable bearing capacity measuring device in this application embodiment is as follows:

[0047] By driving the motor 12, not only can the pressure block 2 be moved downward to squeeze the pile foundation, but the weight-adding liquid in the first receiving cavity 14 can also enter the second receiving cavity 22 on the pressure block 2, enhancing the squeezing effect. This structure not only reduces the overall size of the device, but also avoids the pile foundation being subjected to instantaneous impact force due to the impact of heavy objects, which could lead to inaccurate results in the pile foundation's allowable bearing capacity measurement.

[0048] Meanwhile, in this application, the push rod 33 can drive the two arc plates 312 to move, thereby clamping the two sections of the pile foundation, ensuring that the pile foundation will not tilt during the measurement process, and improving the reliability and accuracy of the measurement results.

[0049] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A device for determining the allowable bearing capacity of a pile foundation, comprising two opposing uprights (1), a bearing block (2) slidably connected at both ends to the two uprights (1), and a limiting mechanism (3) for lateral limiting of the pile foundation disposed on the two uprights (1), wherein each of the two uprights (1) has a groove (11) on its top wall for mounting a drive motor (12) on one side close to each other, the output shaft of the drive motor (12) is connected to a drive screw (13), and the bearing block (2) has connecting plates (21) with screw holes symmetrically connected at both ends, the two connecting plates (21) being threadedly connected to the two drive screws (13), characterized in that: Both of the uprights (1) are provided with a first receiving cavity (14) containing fluid. The bottom surface of the slide (11) is provided with several through holes (15) that communicate with the first receiving cavity (14) at equal intervals. The uprights (1) are slidably connected with baffles (16) at several of the through holes (15). The connecting plate (21) is provided with a contact component (4) that controls the sliding of several baffles (16). The pressure block (2) is provided with a second receiving cavity (22) that communicates with the outside at both ends. The bottom side of the second receiving cavity (22) is located below the connecting plate (21) in the vertical direction.

2. The pile foundation allowable bearing capacity measuring device according to claim 1, characterized in that: The contact assembly (4) includes a contact block (41) movably connected to one side of the connecting plate (21) and a compression spring (42) connected between the contact block (41) and the connecting plate (21). The side wall of the connecting plate (21) is provided with a mounting hole (211). One side of the compression spring (42) is connected to the bottom side of the mounting hole (211) and the contact block (41) can be completely retracted into the mounting hole (211). The outer side walls of several baffles (16) are provided with mating holes (162), and the several mating holes (162) are all sized to match the contact block (41).

3. The pile foundation allowable bearing capacity measuring device according to claim 2, characterized in that: The contact block (41) is a long strip structure and is arranged in a direction perpendicular to the connecting plate (21). Both sides of the contact block (41) in the width direction are provided with rounded corners or chamfers.

4. The pile foundation allowable bearing capacity measuring device according to claim 1, characterized in that: A guide groove (212) is provided through the connecting plate (21), and the first and last ends of the guide groove (212) correspond to the inlet of a plurality of through holes (15) and the second receiving cavity (22), respectively.

5. The pile foundation allowable bearing capacity measuring device according to claim 1, characterized in that: The second receiving cavity (22) includes a left chamber (221) and a right chamber (222) with the same structure. The left chamber (221) and the right chamber (222) are separated from each other, and the left chamber (221) and the right chamber (222) are respectively connected to a return hose communicating with the two first receiving cavities (14) near the bottom position.

6. The pile foundation allowable bearing capacity measuring device according to claim 1, characterized in that: The limiting mechanism (3) includes two arc-shaped limiting plates (31) symmetrically installed at the bottom of the two uprights (1), two cylinders (32) respectively connected to the two limiting plates (31) on opposite sides, and two push rods (33) symmetrically installed on the two uprights (1). The limiting plate (31) includes arc plates (312) located on both sides vertically and a connecting rod (311) in the middle. Both arc plates (312) are slidably engaged with the connecting rod (311). The output end of the push rod (33) is connected to a push plate (34). A first connecting rod (35) is hinged between the two arc plates (312) and the push plate (34). The push plate (34) and the two arc plates (312) are always located on the same vertical plane.

7. The pile foundation allowable bearing capacity measuring device according to claim 6, characterized in that: Both of the two uprights (1) are slidably embedded with positioning cones (5) at their bottoms. The top of the positioning cone (5) is hinged to the push plate (34) with a second connecting rod (51). When the push rod (33) drives the push plate (34) to approach the arc plate (312), the positioning cone (5) moves down and embeds itself into the ground.

8. The pile foundation allowable bearing capacity measuring device according to claim 7, characterized in that: Both of the uprights (1) are equipped with casters (6) at the bottom. When the measuring device is not working, the casters (6) are always located below the positioning cone (5).

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