A single pile static load testing device

Abstract

The utility model relates to static load test technical field discloses a single pile static load testing device, including test pile, the top of test pile is provided with base, the top fixedly connected with load board of base, the bottom left and right sides of load board all are fixedly connected with slide rail, the front and back sides of test pile all are provided with clamp, the outer wall of two clamps all are fixedly connected with connecting plate, the top left and right sides of two connecting plates all are fixedly connected with sliding block, the inner wall of two connecting plates all are screwed with two -way threaded rod, the outer wall of two two -way threaded rods all are fixedly connected with handle. In the utility model, the mechanical linkage design of handle drive two -way threaded rod makes clamp can complete clamping quickly, adapts to different diameter pile body, and through setting scale line on positioning rod and the sliding cooperation with load board, can realize high -precision displacement measurement, and the settlement of test pile is monitored in real time.

Description

Technical Field

[0001] This utility model relates to the field of static load testing technology, and in particular to a single pile static load testing device. Background Technology

[0002] The single pile load test is an in-situ test in which a vertical load is applied to the pile body through a jack at the top of the pile, and the relationship between the settlement at the top of the pile and the load is observed. It is the most widely used method among various methods for testing the bearing capacity of pile foundations. It is recognized as the most accurate and reliable test result and is included in the pile foundation engineering specifications or regulations of various countries. This test method uses various methods to artificially apply loads to simulate the actual working state of the foundation or subgrade and test its bearing capacity and deformation characteristics after loading.

[0003] A search revealed Chinese Patent Publication No. CN217174962U, which discloses a single-pile static load testing device and its usage method. The device includes a load testing apparatus, a test support plate fixedly installed at the bottom, a connecting plate fixedly installed at the bottom of the test support plate, four jacks installed at the bottom of the connecting plate, and connecting seats fixedly installed at the bottom of each jack. This invention utilizes a telescopic rod with anti-slip seats and strips connected to its bottom. Movable seats are connected to the bottom of the load testing apparatus at the top of the telescopic rod, positioned on the four sides of the bottom of the apparatus. This allows for effective extension and support via the telescopic rod during load testing. The anti-slip seats and strips at the bottom of the telescopic rod further enhance stability and prevent slippage, thus improving overall stability. However, in practical use, this single-pile static load testing device is designed for specific pile types and cannot be applied to test piles of different shapes and sizes. Utility Model Content

[0004] To overcome the above shortcomings, this utility model provides a single pile static load testing device, which aims to improve the problem that the existing single pile static load testing devices are designed for specific piles and cannot be applied to test piles of different types and sizes.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a single pile static load testing device, comprising a test pile, a base provided at the top of the test pile, a load plate fixedly connected to the top of the base, slide rails fixedly connected to the left and right sides of the bottom of the load plate, clamps provided on the front and rear sides of the test pile, connecting plates fixedly connected to the outer walls of the two clamps, sliders fixedly connected to the top left and right sides of the two connecting plates, bidirectional threaded rods threadedly connected to the inner walls of the two connecting plates, a throttle fixedly connected to the outer walls of the two bidirectional threaded rods, and positioning rods slidably connected to the inner walls of the load plate, with the same positioning mechanism provided on the outer walls of the plurality of positioning rods.

[0006] Through the above technical solution: the mechanical linkage design of the clamp and the bidirectional threaded rod enables the device to quickly clamp test piles of different diameters; the slide rail and the slider work together to achieve horizontal fine adjustment of the load plate; and the positioning rod and the positioning mechanism constitute a displacement measurement reference system to ensure the accuracy of test data.

[0007] As a further description of the above technical solution: The positioning mechanism includes multiple positioning rings, the inner walls of which are slidably connected to the outer walls of multiple positioning rods. Support legs are fixedly connected to the outer walls of the multiple positioning rings, and pins are fixedly connected to the bottom of the support legs. Two card seats are fixedly connected to the outer walls of the multiple positioning rings, and card slots are opened on the top of the multiple card seats. The same card plate is slidably connected to the outer sides of two adjacent card slots.

[0008] The above technical solution achieves vertical guidance through the gap fit between the positioning ring and the positioning rod, enhances the stability of the positioning rod through the triangular support structure of the support foot and the insertion foot, and forms a rigid whole through the linkage connection between the card plate and the card slot, effectively limiting the horizontal displacement of the positioning rod.

[0009] As a further description of the above technical solution: The outer walls of the multiple positioning rods are provided with scale lines, and the bottoms of the multiple positioning rods are fixedly connected with pads.

[0010] The above technical solution provides intuitive displacement readings through the scale lines and increases the contact area between the positioning rod and the ground by the pads, thus reducing measurement errors caused by uneven ground during the test.

[0011] As a further description of the above technical solution: The inner walls of the multiple feet are threaded with multiple screws, and the outer walls of the two throttles are provided with anti-slip textures.

[0012] The above technical solution involves fixing the pad to the ground with screws, which further enhances the stability of the positioning rod, and the anti-slip texture increases the friction between the hand and the throttle, ensuring the reliability of the clamping operation.

[0013] As a further description of the above technical solution: The top of the load plate is fixedly connected with multiple anti-slip strips, and the top of the load plate is fixedly connected with a fence.

[0014] Through the above technical solutions: anti-slip strips prevent the pressure block from sliding, ensuring the stability of load transmission; the fence forms a safe protection area, preventing objects from falling accidentally.

[0015] As a further description of the above technical solution: The top of each of the anti-slip strips is fixedly connected to the same pressure block, and sensors are fixedly connected to the top left and right sides of the load plate.

[0016] The above technical solution involves a pressure block that centrally transfers the load, and a sensor that monitors the pressure changes of the load plate in real time, providing real-time feedback for test data acquisition.

[0017] As a further description of the above technical solution: Warning lights are fixedly connected to the top left and right sides of the load plate, and a level is fixedly connected to the top front side of the load plate.

[0018] The above technical solution uses a level to assist in calibrating the load plate's levelness, and a warning light linked to a sensor to issue an alarm when there is an overload or when the level deviation exceeds the limit, thus improving test safety.

[0019] As a further description of the above technical solution: The outer walls of all the positioning rings are rounded, and the inner wall diameter of all the positioning rings is the same as the outer wall diameter of the positioning rod.

[0020] The above technical solution reduces frictional resistance between the positioning ring and the positioning rod through smoothing, and the precise fit between the inner wall and the positioning rod ensures vertical guiding accuracy and improves displacement measurement sensitivity.

[0021] This utility model has the following beneficial effects: 1. In this utility model, the mechanical linkage design of the throttle-driven bidirectional threaded rod enables the clamp to be quickly clamped and adapt to piles of different diameters. At the same time, by setting scale lines on the positioning rod and sliding it with the load plate, high-precision displacement measurement can be achieved and the settlement of the test pile can be monitored in real time.

[0022] 2. In this utility model, the sliding connection between the card plate and the card slot enables multiple positioning rings to form a rigid whole, enhancing the deformation resistance of the positioning rod. At the same time, the triangular support structure of the support foot and the insertion foot ensures that the positioning ring stands firmly on the ground, limiting the horizontal displacement of the positioning rod. Attached Figure Description

[0023] Figure 1 This is a three-dimensional schematic diagram of a single pile static load testing device proposed in this utility model; Figure 2 This is a partial structural exploded view of a single pile static load testing device proposed in this utility model; Figure 3 This is a schematic diagram of the positioning rod of a single pile static load testing device proposed in this utility model; Figure 4 This is a schematic diagram of the fixture of a single pile static load testing device proposed in this utility model; Figure 5 This is a schematic diagram of the positioning mechanism of a single pile static load testing device proposed in this utility model.

[0024] Legend: 1. Test stake; 2. Positioning mechanism; 201. Positioning ring; 202. Support leg; 203. Insert; 204. Card seat; 205. Card slot; 206. Card plate; 3. Base; 4. Load plate; 5. Slide rail; 6. Clamp; 7. Connecting plate; 8. Slider; 9. Two-way threaded rod; 10. Turn handle; 11. Positioning rod; 12. Scale line; 13. Pad; 14. Screw; 15. Anti-slip texture; 16. Anti-slip strip; 17. Fence; 18. Pressure block; 19. Sensor; 20. Warning light; 21. Level. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. 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.

[0026] See attached document Figure 1 Appendix Figure 2 and attached Figure 4This utility model provides an embodiment of a single-pile static load testing device, including a test pile 1. A base 3 is provided on the top of the test pile 1, providing a stable support foundation for the entire device. A load plate 4 is fixedly connected to the top of the base 3, serving as a load-bearing platform for external loads, capable of uniformly transferring the applied load to the test pile 1. Slide rails 5 are fixedly connected to the left and right sides of the bottom of the load plate 4, slidingly engaging with the top slider 8 of the connecting plate 7 of the clamp 6, enabling fine-tuning of the horizontal position of the load plate 4 to ensure the load acts perpendicularly on the axis of the test pile 1. Clamps 6 are provided on the front and rear sides of the test pile 1, connected to a bidirectional threaded rod 9 via the connecting plate 7, allowing the device to be fixed to the surface of the test pile 1 via mechanical clamping. Connecting plates 7 are fixedly connected to the outer walls of both clamps 6, serving as transmission connectors between the clamps 6 and the bidirectional threaded rod 9, capable of converting rotational motion into linear displacement. The top left and right sides of the two connecting plates 7... Each of the two connecting plates 7 is fixedly connected to a slider 8, which slides in the slide rail 5 of the load plate 4. The inner walls of the two connecting plates 7 are threaded with bidirectional threaded rods 9, with opposite thread directions at both ends. When rotated, they can synchronously drive the two connecting plates 7 to move towards or away from each other. The outer walls of the two bidirectional threaded rods 9 are fixedly connected with a handle 10, which serves as a manual operation component, making it easy for the tester to apply torque to drive the bidirectional threaded rods 9 to rotate. The inner walls of the load plate 4 are slidably connected with positioning rods 11, which serve as displacement measurement reference components. They can reflect the settlement of the test pile 1 through the relative movement with the load plate 4. The outer walls of the multiple positioning rods 11 are provided with scale lines 12, which adopt millimeter-level indexing design for intuitive reading of the vertical displacement of the load plate 4. The outer walls of the multiple positioning rods 11 are provided with the same positioning mechanism 2. Through the triangular support structure and rigid connecting parts, the horizontal displacement of the positioning rods 11 can be effectively limited to ensure the accuracy of displacement measurement. Specifically, the device is first installed by driving the test pile 1 vertically into the foundation. A base 3 is placed on top of the test pile 1 to achieve a fixed connection between the device and the test pile 1. The throttle 10 is rotated to drive the bidirectional threaded rod 9 to rotate. The bidirectional threaded rod 9 drives the connecting plates 7 on both sides and the clamps 6 fixedly connected to them to move towards each other until the clamps 6 tightly clamp the pile body. This design allows the device to adapt to different pile types and sizes. Next, the testing work is carried out. The position of the load plate 4 on the scale line 12 on the positioning rod 11 is read and recorded as the initial data. Then, a graded load is applied to the load plate 4. Under the action of the load, the test pile 1 will settle. Since the base 3 is connected to the test pile 1 and the load plate 4 is fixedly connected to the base 3, the test pile 1, the load plate 4 and the base 3 settle synchronously. At this time, the inner wall of the load plate 4 slides downward on the outer wall of the positioning rod 11. The scale line 12 on the outer wall of the positioning rod 11 can monitor and reflect the displacement changes during the settlement process in real time, providing data basis for subsequent analysis of the bearing performance of the test pile 1.

[0027] See attached document Figure 1 and attached Figure 5The positioning mechanism 2 includes multiple positioning rings 201, the inner walls of which are slidably connected to the outer walls of multiple positioning rods 11 to achieve the vertical guiding function of the positioning rods 11. The outer walls of the positioning rings 201 are all rounded to reduce frictional resistance with other components. The inner diameter of the multiple positioning rings 201 is consistent with the outer diameter of the positioning rods 11 to ensure coaxiality when the positioning rods 11 pass vertically. Multiple support legs 202 are fixedly connected to the outer walls of the multiple positioning rings 201 to support and fix the positioning rings 201 to the ground around the test pile 1. Each support leg 202 has a fixed pin 203 at its bottom, which forms a stable triangular support structure after being inserted into the ground. The outer walls of each of the multiple positioning rings 201 are fixedly connected to two card seats 204, which serve as the mounting base for the card plate 206. Each of the multiple card seats 204 has a slot 205 at its top for sliding engagement with the card plate 206. The same card plate 206 is slidably connected to the outer side of each of the two adjacent slots 205. Through the limiting engagement between the slots 205 and the card plate 206, the multiple positioning rings 201 are connected into a rigid integral structure, effectively limiting the horizontal displacement of the positioning rod 11. Specifically, multiple positioning rings 201 are respectively fitted onto the outer side of the positioning rod 11. The inner wall of the positioning ring 201 is fitted with the outer wall of the positioning rod 11 with a clearance to ensure smooth sliding. The outer wall of the positioning ring 201 is rounded to avoid friction with other components. The bottom pins 203 of the support feet 202 around the outer wall of the positioning ring 201 are vertically inserted into the ground around the test pile 1. The insertion depth of the pins 203 into the ground is based on the stable contact between the support feet 202 and the ground, forming a triangular support structure to provide positioning support for the positioning rod 11. Then, the clamping plate 206 is inserted along the clamping edge of the adjacent positioning ring 201. The top slot 205 of the seat 204 slides into the slot, so that the card plate 206 simultaneously engages two card seats 204. Through the limiting cooperation between the slot 205 and the card plate 206, multiple positioning rings 201 are connected into a rigid integral structure, which effectively restricts the horizontal displacement of the positioning rod 11. During operation, the settlement of the test pile 1 causes the load plate 4 to slide along the positioning rod 11. The positioning mechanism 2 ensures that the positioning rod 11 remains vertically stable through the ground support of the support leg 202 and the insertion leg 203, as well as the rigid connection of the card plate 206, so that the scale line 12 accurately reflects the displacement of the load plate 4.

[0028] See attached document Figure 1 Appendix Figure 2 and attached Figure 3Each of the multiple positioning rods 11 has a fixed foot 13 at its bottom. The foot 13 increases the contact area between the positioning rod 11 and the ground, making the positioning rod 11 more stable on the ground and reducing the impact of the positioning rod 11 shaking on the measurement results during the test. The inner walls of the multiple feet 13 are threaded with multiple screws 14 to firmly fix the feet 13 to the ground, further enhancing the stability of the positioning rod 11. The outer walls of the two throttles 10 are provided with anti-slip textures 15, which increases the friction between the hand and the throttle 10, allowing the operator to exert force better when turning the throttle 10. The top of the load plate 4 is fixedly connected with multiple anti-slip strips 16, which can increase the friction between the pressure block 18 or other objects placed on the load plate 4 and the load plate 4. The top of the load plate 4 is fixed The load plate 4 is connected to a fence 17 for protection, preventing operators or other objects from accidentally falling off the load plate 4 and ensuring the safety of personnel and equipment. The top of multiple anti-slip strips 16 is fixedly connected to the same pressure block 18, which is used to apply the load required for the test and evenly transfer the load to the load plate 4 and then to the test pile 1. Sensors 19 are fixedly connected to the top left and right sides of the load plate 4 to monitor the status of the load plate 4 in real time. Warning lights 20 are fixedly connected to the top left and right sides of the load plate 4. The warning lights 20 will emit warning signals to remind the operator to take appropriate measures. A level 21 is fixedly connected to the top front of the load plate 4 to detect whether the load plate 4 is in a horizontal state. The operator can adjust the load plate 4 according to the indication of the level 21. Specifically, the pad 13 at the bottom of the positioning rod 11, together with the screw 14, achieves double fixation to ensure the stability and reliability of the displacement measurement benchmark. The anti-slip texture 15 of the throttle 10 enhances the controllability of operation. Combined with the mechanical linkage between the bidirectional threaded rod 9 and the clamp 6, it enables quick clamping. The anti-slip strip 16 of the load plate 4 and the pressure block 18 form a stable force transmission path. Combined with the real-time calibration of the level 21, it ensures that the load is vertical. The fence 17 and the warning light 20 construct a dual safety protection system. Combined with the real-time monitoring of the sensor 19, it enables automatic overload shutdown protection.

[0029] Working principle: First, the test pile 1 is driven vertically into the foundation and fixed to the top of the pile by the base 3. The slide rail 5 at the bottom of the load plate 4 cooperates with the slider 8 at the top of the connecting plate 7 of the clamp 6 to achieve horizontal fine adjustment. Rotating the handle 10 drives the bidirectional threaded rod 9 to rotate, which drives the connecting plates 7 on both sides and the clamp 6 fixedly connected to them to move towards each other, so that the clamp 6 tightly clamps the pile body. The device adapts to different pile types and sizes through the quick clamping design of the clamp 6 and the bidirectional threaded rod 9. During the test, the position of the load plate 4 on the scale line 12 on the positioning rod 11 is read and recorded. Then, by applying graded loads to the load plate 4, the test pile 1, the load plate 4 and the base 3 settle synchronously. At this time, the inner wall of the load plate 4 slides downward on the outer wall of the positioning rod 11, and the displacement change is monitored in real time by the scale line 12. Furthermore, the positioning mechanism 2 plays a crucial role in ensuring the accuracy and stability of the test. During installation, multiple positioning rings 201 are first slidably connected to the outer wall of the positioning rod 11 through their inner walls. Since the inner diameter of the positioning ring 201 is the same as the outer diameter of the positioning rod 11, it ensures a tight fit and smooth sliding. The outer wall of the positioning ring 201 is rounded to avoid scratching other parts or causing unnecessary friction during installation and subsequent use. Next, the positioning ring 201 is adjusted to a suitable position so that the pins 203 at the bottom of the support legs 202 fixedly connected around the outer wall of the positioning ring 201 are inserted into the ground around the test pile 1. After the pins 203 are inserted into the ground, the support legs 202 and the pins 203 together provide stable support for the positioning ring 201, thereby playing a preliminary positioning and fixing role for the positioning rod 11. Subsequently, after multiple positioning rings 201 are installed in their respective positions, the clamping plate 206 is installed. The same clamping plate 206 is slid into the outside of two adjacent clamping slots 205, so that multiple clamping seats 204 engage the clamping plate 206 in pairs. Multiple positioning rings 201 are connected into a whole, further enhancing the correlation and stability between the various positioning rods 11. During operation, when a graded load is applied to the load plate 4 at the top of the test pile 1, the settlement of the test pile 1 will cause the load plate 4 and the base 3 to move synchronously. At this time, due to the action of the positioning mechanism 2, the stability of the positioning rod 11 is strengthened and its displacement is restricted. The load plate 4 slides on the positioning rod 11, and the scale line 12 on the positioning rod 11 can accurately and stably monitor the displacement change of the load plate 4, providing reliable data support for single pile static load testing.

[0030] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A static load testing device for a single pile, comprising a test pile (1), characterized in that: The test pile (1) is provided with a base (3) at the top, and a load plate (4) is fixedly connected to the top of the base (3). Slide rails (5) are fixedly connected to the bottom left and right sides of the load plate (4). Clamps (6) are provided on the front and rear sides of the test pile (1). Connecting plates (7) are fixedly connected to the outer walls of the two clamps (6). Slider (8) is fixedly connected to the top left and right sides of the two connecting plates (7). Two bidirectional threaded rods (9) are threadedly connected to the inner walls of the two connecting plates (7). Turning handles (10) are fixedly connected to the outer walls of the two bidirectional threaded rods (9). Positioning rods (11) are slidably connected to the inner walls of the load plate (4). The same positioning mechanism (2) is provided on the outer walls of the multiple positioning rods (11).

2. The single pile static load testing device according to claim 1, characterized in that: The positioning mechanism (2) includes multiple positioning rings (201). The inner walls of the multiple positioning rings (201) are slidably connected to the outer walls of multiple positioning rods (11). Support legs (202) are fixedly connected around the outer walls of the multiple positioning rings (201). Inserts (203) are fixedly connected to the bottom of the multiple support legs (202). Two card seats (204) are fixedly connected to the outer walls of the multiple positioning rings (201). Card slots (205) are opened on the top of the multiple card seats (204). The same card plate (206) is slidably connected to the outer sides of two adjacent card slots (205).

3. The static load testing device for a single pile according to claim 1, characterized in that: The outer walls of the plurality of positioning rods (11) are provided with scale lines (12), and the bottoms of the plurality of positioning rods (11) are fixedly connected with pads (13).

4. The single pile static load testing device according to claim 3, characterized in that: The inner walls of the multiple feet (13) are threaded with multiple screws (14), and the outer walls of the two throttles (10) are provided with anti-slip textures (15).

5. The static load testing device for a single pile according to claim 1, characterized in that: The top of the load plate (4) is fixedly connected with multiple anti-slip strips (16), and the top of the load plate (4) is fixedly connected with a fence (17).

6. A static load testing device for a single pile according to claim 5, characterized in that: The top of each of the anti-slip strips (16) is fixedly connected to the same pressure block (18), and sensors (19) are fixedly connected to the top left and right sides of the load plate (4).

7. The static load testing device for a single pile according to claim 1, characterized in that: Warning lights (20) are fixedly connected to the top left and right sides of the load plate (4), and a level (21) is fixedly connected to the top front side of the load plate (4).

8. A static load testing device for a single pile according to claim 2, characterized in that: The outer walls of the multiple positioning rings (201) are all rounded, and the inner wall diameter of the multiple positioning rings (201) is consistent with the outer wall diameter of the positioning rod (11).

Images