Device for static load test of small-diameter pile foundation by self-balancing method

Abstract

The application discloses a device for self-balancing method static load test of small-diameter pile foundation, and relates to the technical field of building construction, which comprises a load box, a pouring assembly and an extension assembly, an inner side of the load box is provided with a pouring opening, and an outer end of the load box is provided with a connecting pile, an inner side of the connecting pile is connected with a steel reinforcement cage, and an outer end of the connecting pile is provided with a welding point. The flowing force of the concrete can drive the second guide wheel to rotate, and the second guide wheel is arranged in the pouring pipe, so that the concrete can flow with the aid of the rotation of the second guide wheel during the process of passing through the pouring pipe. The second guide wheel rotates in the same direction with the first guide wheel, so that the second guide wheel can also aid the rotation of the first guide wheel during the rotation of the second guide wheel, and the traction effect of the first guide wheel is better. Through the use of the conical fixer and the pouring assembly, the problem that the concrete at the lower part of the load box is not easy to compact due to the difficulty in guiding the pipe caused by the narrow pouring opening of the small-diameter pile can be greatly reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of building construction, in particular to a device for static load test of small-diameter pile foundation by self-balancing method. BACKGROUND

[0002] The static load test of pile foundation is a technology for detecting the bearing capacity of pile foundation in engineering, mainly for determining the ultimate bearing capacity of single pile. The test is the most accurate and reliable test method at present. The self-balancing pile test method is to install a load box at the balance point of the pile body. The load box is loaded in the vertical direction. The bearing capacity of the upper and lower parts of the load box can be measured simultaneously through the displacement of the pile body.

[0003] The device for static load test of pile foundation by self-balancing method commonly seen in the market needs to arrange a guide pipe (for pouring concrete into the lower end of the steel reinforcement cage), a displacement detector (for detecting the displacement of the pile body), and a hydraulic oil pipe (for vertical pressure of the load box) inside the load box. However, it is difficult to effectively arrange the guide pipe during the preparation of small-diameter piles. Therefore, it is common to directly pour concrete into the small-diameter pile during preparation. However, the concrete is sticky and is prone to blockage during the preparation of small-diameter piles or the concrete at the lower part of the test device is not dense, which seriously affects the construction quality.

[0004] Therefore, in view of the above problems, the existing structure and defects are improved, and a device for static load test of small-diameter pile foundation by self-balancing method is provided. SUMMARY

[0005] The purpose of the present application is to provide a device for static load test of small-diameter pile foundation by self-balancing method to solve the problems in the background art.

[0006] To achieve the above-mentioned purpose, the present application provides the following technical scheme: a device for static load test of small-diameter pile foundation by self-balancing method, comprising a load box, a concrete pouring assembly, and an extension assembly. The inner side of the load box is provided with a concrete pouring opening, and the outer end of the load box is provided with a connecting pile. The inner side of the connecting pile is connected with a steel reinforcement cage, and the outer end of the connecting pile is provided with a welding point. The top outer end of the load box is connected with a conical fixator. The concrete pouring assembly is arranged inside the conical fixator. The bottom outer side of the load box is connected with a concrete pouring pipe, and the inside of the concrete pouring pipe is provided with second guide wheels on both sides. The outside of the concrete pouring pipe is provided with second guide columns on both sides. The bottom outer side of the load box is connected with a supporting rib. The inner side of the load box is provided with a sliding groove. The extension assembly is arranged inside the load box. The top left end of the load box is connected with a slurry conveying pipe, and the right top end of the load box is connected with a hydraulic oil pipe.

[0007] Further, the connecting piles are annularly distributed at the outer end of the load box, and the connecting piles and the load box are integrated.

[0008] Further, the conical fixer is welded with the load box and the steel reinforcement cage, and the diameter of the conical end of the conical fixer is larger than that of the pouring port.

[0009] Further, the pouring assembly comprises a first flow guide wheel, a sleeving fixing base, a rotating shaft, a first transmission belt, a first guide column and a second transmission belt, the first flow guide wheel is provided with the sleeving fixing base on the two sides of the outer portion, the rotating shaft is arranged between the first flow guide wheel and the sleeving fixing base, the rotating shaft is connected with the first transmission belt at the outer end, the first transmission belt is connected with the first guide column at the end, and the first guide column is connected with the second transmission belt at the outer end.

[0010] Further, the sleeving fixing base covers the rotating shaft when the sleeving fixing base is sleeved with the first flow guide wheel, and the first transmission belt is arranged on the inner side of the sleeving fixing base.

[0011] Further, the first flow guide wheel drives the first transmission belt to rotate through the rotating shaft, and the first transmission belt drives the second transmission belt to rotate through the first guide column.

[0012] Further, the second transmission belt drives the second flow guide wheel to rotate through the second guide column, and the second guide column and the second flow guide wheel are consistent with the first guide column and the first flow guide wheel in structure.

[0013] Further, the extension assembly comprises an extension base, a slurry outlet pipe, a slurry outlet port and a hydraulic rod, the extension base is provided with the slurry outlet pipe on the inner side of the extension base, the extension base is provided with the slurry outlet port on the outer end, and the extension base is provided with the hydraulic rod on the upper side and the lower side.

[0014] Further, the load box is divided into two sections, and the load box is connected with the extension base in a sleeving mode.

[0015] Further, the two sections of the load box are combined into an integrated whole through the butt welding of the outer end connecting piles at the welding points, and the connecting piles are welded with the steel reinforcement cage.

[0016] The application provides a device for small-diameter pile foundation self-balancing method static load test, and has the following beneficial effects:

[0017] 1、The height of the concrete flow to the taper holder, will gradually flow to the direction of the shape of the concrete mouth, which makes the concrete can pass through the concrete mouth, into the steel cage inside the load box end, and the flow of concrete in the process of the inside of the taper holder, flow generated by the thrust can drive the first flow wheel rotation, and the first flow wheel in the process of rotation, can be driven by the first transmission belt rotation of the first guide column, and the first guide column in the process of rotation, can be driven by the second transmission belt rotation of the second guide column, because the second guide column and the second flow wheel with the first guide column, the first flow wheel structure is consistent, which makes the flow of concrete can drive the second flow wheel rotation, and the second flow wheel is arranged inside the concrete pipe, which makes the concrete through the concrete pipe in the process, can be due to the rotation of the second flow wheel to assist its flow, because the second flow wheel and the first flow wheel are co-rotating, which makes the second flow wheel can also assist the first flow wheel rotation when rotating, which makes the traction effect of the first flow wheel can be better, through the use of the taper holder and the pouring concrete assembly, can greatly reduce the difficulty of the lower guide pipe due to the narrow concrete mouth of the small diameter pile, direct pouring of concrete is easy to block, in addition, the placement site of the slurry pipe and the hydraulic oil pipe is located at the outer end of the taper holder, which can avoid the interference between the slurry pipe and the hydraulic oil pipe and grouting.

[0018] 2、The steel reinforcement of the steel cage is welded after extending into the inside of the adapter pile, which can make the steel cage and the adapter pile combined into one, and because the adapter pile and the load box are integrated, which can ensure the stable connection of the load box and the steel cage, in addition, the welding points of the two groups of adapter piles will be separated due to the tension generated by the upward and downward displacement of the load box, and the conical structure of the welding point can ensure its smooth separation under a larger tension, the use of the adapter pile can effectively ensure the welding stability of the steel cage and the load box, and because the two groups of steel cages can be combined into one by the butt welding of the two groups of adapter piles, which can effectively reduce the problem of the inclination of the poured pile caused by the deformation of the steel cage due to stress, and the easy separation of the welding point can also ensure that it will not interfere with the static load test.

[0019] 3. After the load box of the present invention is pushed out to both ends, the slurry outlet of the extension seat can be exposed from the inner side of the load box. At this time, the staff inputs cement mortar into the slurry pipe, which can make the cement mortar flow out from the slurry outlet through the slurry pipe and the slurry outlet, so that the cement mortar can wrap the entire load box and contact the pile bodies on the upper and lower sides. When the cement mortar solidifies, the load box at the middle end and the pile bodies at both ends can be integrated into one. Thanks to the fixation of the load box and the pile body, the stability of the docking of the pile bodies at both ends can be effectively guaranteed. Because when conducting a static load test, the pile bodies at the upper and lower ends of the load box will move in opposite directions, which will separate the two pile bodies. Through the above operations, the equipment can achieve stable docking of the two pile bodies without taking the pile bodies out of the foundation pit, which can greatly improve the operating convenience of the equipment. At the same time, it also enables the equipment to adapt to spaces with smaller operating ranges such as bridges and crowded construction sites, thereby improving the applicability of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the overall structure of a device for static load testing of a small-diameter pile foundation using a self-balancing method according to the present invention;

[0021] Figure 2 This is a schematic diagram of the top view of the load box of a device for static load testing of a small-diameter pile foundation using a self-balancing method according to the present invention;

[0022] Figure 3 This is a schematic diagram of the three-dimensional structure of the connecting piles of a device for static load testing of a small-diameter pile foundation using a self-balancing method according to the present invention;

[0023] Figure 4 This is a schematic structural diagram of a conical fixture of a device for static load testing of a small-diameter pile foundation using a self-balancing method according to the present invention;

[0024] Figure 5 This is a schematic structural diagram of a concrete pouring assembly of a device for static load testing of a small-diameter pile foundation using a self-balancing method according to the present invention;

[0025] Figure 6 The figure is a schematic diagram of the extended component structure of a device for static load testing of small-diameter pile foundations using the self-balancing method according to the present invention.

[0026] In the figure: 1. Load box; 2. Concrete outlet; 3. Connecting pile; 4. Steel cage; 5. Welding point; 6. Cone-shaped fixture; 7. Concrete pouring assembly; 701. First guide wheel; 702. Socket fixing seat; 703. Rotating shaft; 704. First conveyor belt; 705. First guide column; 706. Second conveyor belt; 8. Concrete pipe; 9. Second guide wheel; 10. Second guide column; 11. Support rib; 12. Chute; 13. Extension assembly; 1301. Extension seat; 1302. Slurry outlet pipe; 1303. Slurry outlet; 1304. Hydraulic rod; 14. Slurry pipe; 15. Hydraulic oil pipe. DETAILED DESCRIPTION

[0027] Please refer to Figures 1 to 6 The application provides a technical scheme: a device for static load test of small-diameter pile foundation self-balancing method, which comprises a load box 1, a pouring assembly 7 and an extension assembly 13. The inner side of the load box 1 is provided with a pouring opening 2, and the outer end of the load box 1 is provided with an adapter pile 3. The inner side of the adapter pile 3 is connected with a steel reinforcement cage 4, and the outer end of the adapter pile 3 is provided with a welding point 5. The top outer end of the load box 1 is connected with a conical fixer 6. The pouring assembly 7 is arranged on the inner side of the conical fixer 6. The bottom outer side of the load box 1 is connected with a pouring pipe 8, and the inside of the pouring pipe 8 is provided with second flow guide wheels 9 on both sides. The outside of the pouring pipe 8 is provided with second guide columns 10 on both sides. The bottom outer side of the load box 1 is connected with a support rib 11. The inner side of the load box 1 is provided with a sliding groove 12. The extension assembly 13 is arranged on the inner side of the load box 1. The top left end of the load box 1 is connected with a slurry conveying pipe 14, and the right top end of the load box 1 is connected with a hydraulic oil pipe 15.

[0028] Please refer to Figures 1 to 6 The adapter pile 3 is annularly distributed on the outer end of the load box 1, and the adapter pile 3 is integrated with the load box 1. The conical fixer 6 is welded and connected with the load box 1 and the steel reinforcement cage 4. The caliber of the conical end of the conical fixer 6 is larger than the caliber of the pouring opening 2. The pouring assembly 7 comprises first flow guide wheels 701, sleeve fixing seats 702, shafts 703, first transmission belts 704, first guide columns 705 and second transmission belts 706. The outside of the first flow guide wheels 701 is provided with sleeve fixing seats 702, and the shafts 703 are arranged between the first flow guide wheels 701 and the sleeve fixing seats 702. The outer end of the shafts 703 is connected with the first transmission belts 704, and the ends of the first transmission belts 704 are connected with the first guide columns 705. The outer end of the first guide columns 705 is connected with the second transmission belts 706. When the sleeve fixing seat 702 is sleeved with the first flow guide wheel 701, the shaft 703 is covered. The first transmission belts 704 are arranged on the inner side of the sleeve fixing seat 702. The first flow guide wheels 701 drive the first transmission belts 704 to rotate through the shafts 703. The first transmission belts 704 drive the second transmission belts 706 to rotate through the first guide columns 705. The second transmission belts 706 drive the second flow guide wheels 9 to rotate through the second guide columns 10. The second guide columns 10 and the second flow guide wheels 9 have the same structure as the first guide columns 705 and the first flow guide wheels 701. The extension assembly 13 comprises an extension seat 1301, a slurry outlet pipe 1302, a slurry outlet 1303 and hydraulic rods 1304. The inner side of the extension seat 1301 is provided with the slurry outlet pipe 1302, and the outer end of the extension seat 1301 is provided with the slurry outlet 1303. The upper and lower sides of the extension seat 1301 are provided with the hydraulic rods 1304. The load box 1 is divided into two sections, and the load box 1 is sleeved and connected with the extension seat 1301. The two sections of the load box 1 are combined into one through the outer end adapter pile 3 at the welding point 5, and the adapter pile 3 is welded and connected with the steel reinforcement cage 4.

[0029] The specific operation is as follows: after the staff sets the load box 1 at the self-balancing point position of the reinforcement cage 4, the steel bars of the reinforcement cage 4 are inserted into the inside of the connecting pile 3 and then welded, so that the reinforcement cage 4 and the connecting pile 3 are combined into an integrated whole, and because the connecting pile 3 and the load box 1 are integrated, the stable connection of the load box 1 and the reinforcement cage 4 is ensured, at this time the staff inserts the conical fixer 6 into the inside of the reinforcement cage 4, and after the conical surface of the conical fixer 6 is attached to the load box 1, the staff welds the attachment surfaces of the conical fixer 6, the reinforcement cage 4 and the load box 1, so that the conical fixer 6 is welded with the reinforcement cage 4 and the load box 1, and through the auxiliary fixation of the conical fixer 6, the stability of the connection of the load box 1 and the reinforcement cage 4 is further improved, after the fixation of the conical fixer 6 is completed, the staff welds the two ends of the support bar 11 with the bottom surface of the reinforcement cage 4 and the load box 1 respectively, so as to ensure the fixation stability of the load box 1 and the reinforcement cage 4 at the bottom end, after the fixation of the load box 1 and the reinforcement cage 4 is completed, the staff connects the slurry conveying pipe 14 and the hydraulic oil pipe 15 with the load box 1 respectively, and then the staff places the combined reinforcement cage 4 longitudinally and puts it into the inside of the foundation pit, and then pours the concrete into the opening of the reinforcement cage 4 exposed to the ground, so that the concrete flows into the inside of the reinforcement cage 4, and when the concrete flows to the height of the conical fixer 6, it will gradually flow and gather in the direction of the concrete pouring port 2 due to the shape characteristics of the conical fixer 6, which makes the concrete flow into the inside of the reinforcement cage 4 at the bottom end of the load box 1 through the concrete pouring port 2 and the concrete pouring pipe 8, and in the process of flowing in the inside of the conical fixer 6, the thrust generated by the flow of the concrete can drive the first guide wheel 701 to rotate, and in the process of rotation, the first guide wheel 701 can drive the first transmission belt 704 to rotate through the rotating shaft 703, so that the first guide column 705 rotates, and in the process of rotation, the first guide column 705 can drive the second guide column 10 to rotate through the second transmission belt 706, because the second guide column 10 and the second guide wheel 9 have the same structure as the first guide column 705 and the first guide wheel 701, so that the force of the flowing concrete can drive the second guide wheel 9 to rotate, and the second guide wheel 9 is arranged in the inside of the concrete pouring pipe 8, so that in the process of flowing through the concrete pouring pipe 8, the second guide wheel 9 can assist the flow due to the rotation of the second guide wheel 9, because the second guide wheel 9 and the first guide wheel 701 rotate in the same direction, so that the second guide wheel 9 can also assist the rotation of the first guide wheel 701 when it rotates, which makes the traction effect of the first guide wheel 701 better, through the use of the conical fixer 6 and the concrete pouring assembly 7, the problem of difficulty in pouring concrete through the narrow lower pipe of the small-diameter pile concrete pouring port 2 and easy blockage of the concrete poured directly can be greatly reduced, in addition, because the arrangement positions of the slurry conveying pipe 14 and the hydraulic oil pipe 15 are located at the positions outside the end of the conical fixer 6 which are not grouted, the slurry conveying pipe 14 and the hydraulic oil pipe 15 can avoid interference caused by grouting, and after the concrete fills the reinforcement cage 4 and solidifies to form a pile body, the staff pours hydraulic oil into the hydraulic oil pipe 15, and the hydraulic oil can enter the hydraulic rods 1304 at the two ends outside the extension seat 1301,The hydraulic oil enters the inside of the hydraulic rod 1304, and can generate an outward pushing force on the load box 1, so that the load box 1 is synchronously displaced to the upper and lower ends. Since the load box 1 is arranged at the self-balancing point of the reinforcement cage 4, the displacement distance of the load box 1 pushing the upper and lower ends to form the pile body can be calculated, and the pouring quality of the pile body can be judged by the pile foundation self-balancing method static load test. During the displacement of the load box 1 to the upper and lower ends due to the pushing force, the welding points 5 of the two groups of connecting piles 3 will be separated due to the pulling force generated by the separation of the upper and lower ends. Thanks to the conical structure of the welding points 5, it can be ensured that they can be smoothly separated when subjected to a larger pulling force. Through the use of the connecting pile 3, the welding stability of the reinforcement cage 4 and the load box 1 can be effectively guaranteed. Since the two groups of reinforcement cages 4 can be combined into one through the butt welding of the two groups of connecting piles 3, the problem of tilting of the poured pile body caused by deformation of the reinforcement cage 4 due to stress can be effectively reduced. The easy-to-separate feature of the welding points 5 can also ensure that they will not interfere with the static load test. After the load box 1 is pushed out to the two ends, the slurry outlet 1303 of the extension seat 1301 can be exposed from the inside of the load box 1. At this time, the worker inputs cement mortar into the slurry conveying pipe 14, so that the cement mortar flows out from the slurry outlet 1303 through the slurry conveying pipe 14 and the slurry outlet pipe 1302. This makes the cement mortar can wrap the entire load box 1 and contact with the pile body on the upper and lower sides. When the cement mortar solidifies, it can fuse the load box 1 located at the middle end and the pile bodies at the two ends into one. Thanks to the fixation of the load box 1 and the pile body, the stability of the butt joint of the pile bodies at the two ends can be effectively guaranteed. Since during the static load test, the pile bodies at the upper and lower ends of the load box 1 will be displaced in opposite directions, which will cause the two pile bodies to separate. Through the above operation, the device can realize the stable butt joint of the two pile bodies without taking out the pile body from the foundation pit, which can greatly improve the operation convenience of the device. At the same time, this also makes the device can adapt to the space with small operation range such as bridge, crowded construction site, etc., so as to improve the application range of the device.

[0030] In summary, the device for self-balancing method static load test of small-diameter pile foundation, in use, first, the staff sets the load box 1 at the self-balancing point of the reinforcement cage 4, then welds the reinforcement of the reinforcement cage 4 into the inside of the adapter pile 3, so that the reinforcement cage 4 and the adapter pile 3 are combined into one, and because the adapter pile 3 and the load box 1 are integrated, the stable connection of the load box 1 and the reinforcement cage 4 is ensured, at this time, the staff inserts the conical fixer 6 into the inside of the reinforcement cage 4, and then welds the conical surface of the conical fixer 6 to the load box 1, so that the conical fixer 6 is welded to the reinforcement cage 4 and the load box 1, and through the auxiliary fixation of the conical fixer 6, the connection stability of the load box 1 and the reinforcement cage 4 is further improved, after the fixation of the conical fixer 6 is completed, the staff welds the two ends of the support rod 11 to the bottom surface of the reinforcement cage 4 and the load box 1 respectively, so that the fixation stability of the load box 1 and the reinforcement cage 4 at the bottom end is ensured, after the fixation of the load box 1 and the reinforcement cage 4 is completed, the staff connects the slurry conveying pipe 14 and the hydraulic oil pipe 15 to the load box 1 respectively, then the staff places the combined reinforcement cage 4 longitudinally and puts it into the foundation pit, and then pours the concrete into the opening of the reinforcement cage 4 exposed to the ground, so that the concrete flows into the inside of the reinforcement cage 4;

[0031] Then the concrete flows to the height of the conical fixer 6, and then gradually flows and gathers in the direction of the concrete pouring port 2 due to the shape characteristics of the conical fixer 6, so that the concrete can flow into the inside of the reinforcement cage 4 at the bottom end of the load box 1 through the concrete pouring port 2 and the concrete pouring pipe 8, and in the process of flowing in the inside of the conical fixer 6, the thrust generated by the flow of the concrete can drive the first guide wheel 701 to rotate, and in the process of rotation, the first guide wheel 701 can drive the first transmission belt 704 to rotate through the rotating shaft 703, so that the first guide column 705 rotates, and in the process of rotation, the first guide column 705 can drive the second guide column 10 to rotate through the second transmission belt 706, and because the second guide column 10 and the second guide wheel 9 have the same structure as the first guide column 705 and the first guide wheel 701, the force of the flowing concrete can drive the second guide wheel 9 to rotate, and the second guide wheel 9 is arranged in the inside of the concrete pouring pipe 8, so that in the process of flowing through the concrete pouring pipe 8, the flow of the concrete can be assisted by the rotation of the second guide wheel 9, and because the second guide wheel 9 and the first guide wheel 701 rotate in the same direction, the rotation of the second guide wheel 9 can also assist the rotation of the first guide wheel 701, so that the traction effect of the first guide wheel 701 is better, and through the use of the conical fixer 6 and the concrete pouring assembly 7, the problem of difficulty in pouring concrete into the lower pipe due to the narrow concrete pouring port 2 of the small-diameter pile and the problem of easy blockage by directly pouring concrete can be greatly reduced;

[0032] Then the concrete fills the reinforcement cage 4 and solidifies to form a pile body, then the staff injects hydraulic oil into the hydraulic oil pipe 15, the hydraulic oil can enter the inside of the hydraulic rod 1304, after the hydraulic oil enters the inside of the hydraulic rod 1304, an outward pushing force can be generated on the load box 1, because the load box 1 is arranged at the self-balancing point of the reinforcement cage 4, the displacement distance of the load box 1 pushing the pile body at the upper and lower ends can be calculated, and the pouring quality of the pile body can be judged by the pile foundation self-balancing method static load test, in the process of the displacement of the load box 1 to the upper and lower ends due to the pushing force, the two groups of welding points 5 of the connecting piles 3 can be separated due to the pulling force generated by the separation of the upper and lower ends, and the conical structure of the welding points 5 can ensure that the welding points 5 can be smoothly separated when subjected to a large pulling force, the use of the connecting piles 3 can effectively ensure the welding stability of the reinforcement cage 4 and the load box 1, and the two groups of reinforcement cages 4 can be combined into one by the butt welding of the two groups of connecting piles 3, which can effectively reduce the problem that the poured pile body is inclined due to the deformation of the reinforcement cage 4 caused by stress, and the easy separation of the welding points 5 can ensure that the welding points 5 will not interfere with the static load test;

[0033] Finally, after the load box 1 pushes out to the two ends, the outflow port 1303 of the extension seat 1301 can be exposed from the inside of the load box 1, at this time, the staff inputs the cement mortar into the slurry conveying pipe 14, so that the cement mortar flows out from the outflow port 1303 through the slurry conveying pipe 14 and the slurry outlet pipe 1302, which makes the cement mortar wrap the entire load box 1 and contact the pile bodies on the upper and lower sides, and when the cement mortar solidifies, the load box 1 at the middle end and the pile bodies at the two ends can be integrated into one, and due to the fixation of the load box 1 and the pile bodies, the stability of the butt joint of the pile bodies at the two ends can be effectively ensured, because during the static load test, the pile bodies at the upper and lower ends of the load box 1 will displace in opposite directions, which will cause the two pile bodies to separate, through the above operation, the device can realize the stable butt joint of the two pile bodies without taking out the pile bodies from the foundation pit, which can greatly improve the operation convenience of the device, and at the same time, the device can adapt to spaces with small operation ranges such as bridges and crowded construction sites, so as to improve the application range of the device.

[0034] Embodiments of the present application are given for the purpose of illustration and description, and are not intended to be exhaustive or to limit the application to the forms disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art. Embodiments are chosen and described in order to best explain the principles of the application and its practical application, and to enable others skilled in the art to understand the application for various embodiments with various modifications as are suited to the particular use contemplated.

Claims

1. A device for static load testing of small diameter pile foundations using the self-balancing method, characterized in that: The invention comprises a load box (1), a concrete pouring assembly (7) and an extension assembly (13), wherein the inner side of the load box (1) is provided with a concrete opening (2), and the outer end of the load box (1) is provided with a connecting pile (3), the inner side of the connecting pile (3) is connected to a steel cage (4), and the outer end of the connecting pile (3) is provided with a welding point (5), the top outer end of the load box (1) is connected to a conical fixture (6), the concrete pouring assembly (7) is placed on the inner side of the conical fixture (6), the bottom outer side of the load box (1) is connected to a concrete pipe (8), and the inner sides of the concrete pipe (8) are provided with second guide wheels (9), the outer sides of the concrete pipe (8) are provided with second guide columns (10), the bottom outer side of the load box (1) is connected to a support rib (11), the inner side of the load box (1) is provided with a slide groove (12), and the extension assembly (13) is provided with a plurality of guide wheels (14). 3) is placed on the inner side of the load box (1), the top left end of the load box (1) is connected to a slurry pipe (14), and the top right end of the load box (1) is connected to a hydraulic oil pipe (15), the concrete pouring assembly (7) comprises a first guide wheel (701), a sleeve fixing seat (702), a rotating shaft (703), a first transmission belt (704), a first guide column (705) and a second transmission belt (706), the first guide wheel (701) is provided with a sleeve fixing seat (702) on both sides of the outside, and a rotating shaft (703) is provided between the first guide wheel (701) and the sleeve fixing seat (702), the outer end of the rotating shaft (703) is connected to the first transmission belt (704), and the end of the first transmission belt (704) is connected to the first guide column (705), and the outer end of the first guide column (705) is connected to the second transmission belt (706).

2. The device for static load test of small diameter pile foundation self-balancing method according to claim 1, characterized in that: The connecting piles (3) are distributed in a ring shape at the outer end of the load box (1), and the connecting piles (3) and the load box (1) are integrated.

3. The device for static load test of small diameter pile foundation self-balancing method according to claim 1, characterized in that: The conical fixture (6) is welded to the load box (1) and the steel cage (4), and the diameter of the conical end of the conical fixture (6) is larger than the diameter of the concrete opening (2).

4. The device for static load testing of a small-diameter pile foundation using a self-balancing method according to claim 1, characterized in that: The sleeve fixing seat (702) covers the rotating shaft (703) when sleeved with the first guide wheel (701), and the first transmission belt (704) is arranged on the inner side of the sleeve fixing seat (702).

5. The device for static load test of small diameter pile foundation self-balancing method according to claim 4, characterized in that: The first guide wheel (701) drives the first conveyor belt (704) to rotate via the rotating shaft (703), and the first conveyor belt (704) drives the second conveyor belt (706) to rotate via the first guide column (705).

6. The device for static load testing of a small-diameter pile foundation using a self-balancing method according to claim 5, characterized in that: The second transmission belt (706) drives the second guide wheel (9) to rotate via the second guide column (10), and the second guide column (10) and the second guide wheel (9) have the same structure as the first guide column (705) and the first guide wheel (701).

7. The device for static load testing of a small-diameter pile foundation using a self-balancing method according to claim 1, characterized in that: The extension assembly (13) comprises an extension seat (1301), a pulp outlet pipe (1302), a pulp outlet (1303) and a hydraulic rod (1304); the extension seat (1301) is provided with a pulp outlet pipe (1302) on the inner side of the extension seat (1301), and the pulp outlet (1303) is provided at the outer end of the extension seat (1301); and hydraulic rods (1304) are provided on the upper and lower sides of the extension seat (1301).

8. The device for static load testing of a small-diameter pile foundation using a self-balancing method according to claim 7, characterized in that: The load box (1) is divided into two sections, an upper section and an lower section, and the load box (1) is sleeve-connected to the extension seat (1301).

9. The device for static load testing of a small-diameter pile foundation using a self-balancing method according to claim 8, characterized in that: The upper and lower sections of the load box (1) are integrated by butt welding the outer end connecting piles (3) at the welding points (5), and the connecting piles (3) are welded to the steel cage (4).

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