A tension-resistant connecting pile structure for foundation slab and its construction method

Abstract

This invention discloses a pull-out connecting pile structure and construction method for a foundation slab. The structure includes: a precast hollow pipe pile (4) fixedly connected at its upper end to a reinforced concrete foundation (6) as the main pull-out component; a threaded steel pipe (2) that is concentric with the precast hollow pipe pile (4) and inserted into a hole; a rhomboid anchoring mechanism (3) that is uniformly and continuously arranged along the threaded steel pipe. The rhomboid anchoring mechanism (3) includes a connecting sleeve (301) with an inner hole that is slidably connected to the threaded steel pipe (2), a wall-supporting connecting rod (302), and a force-applying plate (303) that is rotatably connected to the protruding end of the wall-supporting connecting rod (302) and keeps in contact with the inner wall to provide support force; an upper end cap plate (8) sleeved on the upper end of the threaded steel pipe (2) and fixed to the top of the precast hollow pipe pile (4); and concrete filling the voids in the precast hollow pipe pile (4).

Description

Technical Field

[0001] This invention belongs to the field of anti-pull-out connection technology, and more specifically, relates to an anti-pull-out connection pile structure for foundation slabs and its construction method. Background Technology

[0002] With the development and progress of my country's social economy, the demand for underground space in buildings is increasing. To meet the requirements for the size and quantity of underground space, more and more buildings are adopting single- or multi-story basement designs. However, overall or partial anti-buoyancy of the foundation has become an urgent problem for designers. When anti-buoyancy cannot meet the calculation requirements, it is necessary to solve the anti-buoyancy problem by designing anti-uplift piles. Existing anti-uplift piles are usually precast hollow pipe piles made of reinforced concrete, which rely on the friction between the pile body and the soil layer to resist axial tensile force and improve the anti-uplift performance. Currently, the common method for connecting anti-uplift precast hollow pipe piles to the foundation is to place a steel cage with longitudinal reinforcement and stirrups inside the hollow pipe of the pile, and then pour in core-filling concrete. The pile body is then connected to the foundation through the steel reinforcement, thereby transmitting axial tensile force. However, during pile cutting construction, it is easy to cut off the pile body reinforcement, requiring further manual removal of some pile body reinforcement, making the construction process relatively complex. Therefore, a high-strength anti-uplift connection pile structure is proposed to improve the anti-buoyancy capacity of buildings.

[0003] Chinese utility model patent CN203270554U discloses a pipe pile joint and a pipe pile foundation. The pipe pile joint includes a pipe pile, core concrete, core concrete reinforcement, and welded reinforcement. The core concrete is formed on the inner wall of the pipe pile. The core concrete reinforcement is partially embedded in the core concrete and extends beyond the top of the pipe pile. The welded reinforcement is partially welded to the side of the pipe pile and extends beyond the top of the pipe pile. The pipe pile foundation includes a pile cap and the aforementioned pipe pile joint. The portions of the core concrete reinforcement extending beyond the top of the pipe pile and the portions of the welded reinforcement extending beyond the top of the pipe pile are welded to the pile cap, respectively. Furthermore, Chinese invention patent CN106320327A discloses an anti-uplift pipe pile and its connection method with a foundation slab. Its characteristic is that the pile head of the concrete pipe pile is provided with several sleeves connected to the threaded anchor bars. The anchor bars are pre-embedded in the concrete pipe pile after being connected by the internal threads of the sleeves. The concrete pipe pile is connected to the anti-uplift reinforcement of the foundation slab by the sleeves to form an anti-uplift pipe pile foundation.

[0004] The above-mentioned patented technologies all enhance pull-out resistance by adding steel reinforcement structures to the original hollow pipe piles. However, the following technical problems still exist: (1) Before construction, hollow pipe piles generally require the manufacturer to directly provide pipe pile products of a fixed length, rather than special treatment for specific dimensions. In the later construction process, the length is adjusted according to the actual working conditions and cut at the corresponding position. During the cutting process, it is difficult to avoid cutting the steel reinforcement inside the cement layer. Therefore, the above-mentioned patented technology solutions are only used when the size is customized, which leads to increased costs and complicated manufacturing processes. (2) The connection method between the foundation and the steel reinforcement inside the cement layer of the hollow pipe pile determines that the cylinder wall is the main load-bearing object. However, the horizontal load-bearing capacity of the cylinder wall is not strengthened. As a result, when the cylinder wall is damaged, the tensile system will collapse, resulting in a significant reduction in tensile strength. (3) While ensuring the improvement of pull-out strength, it is necessary to simplify the construction process. Summary of the Invention

[0005] To address the aforementioned deficiencies or improvement needs of existing technologies, this invention provides an anti-pull-out connection pile structure for foundation slabs. By setting multiple force transmission points and combining them with a diamond-shaped anchoring mechanism sleeved on a threaded steel pipe, the downward screwing of the top fastening nut expands the diamond-shaped anchoring mechanism, maintaining tight contact with the inner wall of the precast hollow pipe pile. This improves the fixing reliability between the threaded steel pipe and the pile sidewall. Simultaneously, concrete is poured. When the foundation layer moves upward due to buoyancy, the upper end cap plate experiences an upward force, which is transmitted through the nut to the threaded steel pipe, and then through the centrally located threaded steel pipe... The force is transferred to the rhomboid anchoring mechanism, and then to the pre-embedded hollow pipe pile. This avoids the technical problem of manually peeling the steel reinforcement connection section from the pre-cast hollow pipe pile, which is present in existing technologies. It effectively solves the technical problem of easily cutting the steel reinforcement during the cutting process of the pre-cast hollow pipe pile, leading to construction difficulties. At the same time, it reduces the complexity of the construction process during pile splicing and cutting, solves the problem of poor consistency, and reduces the workload of on-site steel reinforcement binding. While ensuring the connection's firmness, it also improves the standardization of operations and increases construction efficiency to a certain extent, including:

[0006] The precast hollow pipe pile, which is fixedly connected to the reinforced concrete foundation at its upper end and serves as the main tensile-resistant component, and the threaded steel pipe, which is concentric with the precast hollow pipe pile and inserted into the hole.

[0007] A diamond-shaped anchoring mechanism is installed on the inner wall of the precast hollow pipe pile and slidably connected to the threaded steel pipe for horizontal support and force transmission of the inner wall. The diamond-shaped anchoring mechanism is evenly and continuously arranged along the threaded steel pipe. The diamond-shaped anchoring mechanism includes a connecting sleeve with an inner hole that is slidably connected to the threaded steel pipe, a wall-supporting connecting rod that is rotatably connected to both sides of the connecting sleeve, and a force-applying plate that is rotatably connected to the extended end of the wall-supporting connecting rod and keeps in contact with the inner wall for providing support force. The connecting sleeve at the bottom of the diamond-shaped anchoring mechanism array is fixedly connected to the threaded steel pipe.

[0008] The upper end cap plate is sleeved on the upper end of the threaded steel pipe and fixed to the top of the precast hollow pipe pile;

[0009] A fastening nut that maintains a threaded connection with the external thread located on the outer wall of the threaded steel pipe;

[0010] Concrete used to fill the voids in the inner hole of a precast hollow pipe pile.

[0011] Furthermore, it also includes:

[0012] The foundation connecting steel bars are fixedly connected to the upper end of the threaded steel pipe.

[0013] Furthermore, it also includes:

[0014] The lower end cap plate is fixedly installed at the lower end of the threaded steel pipe.

[0015] Furthermore, the connection between the two ends of the threaded steel pipe and the foundation connecting steel bars and the lower end cap plate is fixed by welding.

[0016] Furthermore, the threaded steel pipe has a casting cavity at its center, and concrete is poured into the casting cavity.

[0017] Furthermore, the outer diameter of the threaded steel pipe is smaller than the inner diameter of the precast hollow pipe pile.

[0018] Furthermore, the inner wall of the precast hollow pipe pile is roughened.

[0019] A construction method for an anti-uplift connection pile structure for a foundation slab includes the following steps:

[0020] S100: First, prefabricated hollow pipe piles are pre-embedded and cut to the required length according to the actual working conditions. Then, threaded steel pipes and diamond-shaped anchoring mechanisms are installed inside the prefabricated hollow pipe piles.

[0021] S200: Pour concrete into the pre-embedded hollow pipe pile, then install the upper end cap plate on top of the pre-embedded hollow pipe pile, and then insert the fastening nut into the interior.

[0022] S300: Tightening the fastening nut 7 while the concrete is not yet set causes the central sleeve to lift upwards, thereby driving the connecting sleeve fixed to the lower end of the threaded steel pipe to move upwards. This reduces the distance between the two sets of connecting sleeves of the diamond anchoring mechanism, which in turn reduces the angle between the wall support rod and the horizontal direction, causing the force plates on the left and right sides to move in the opposite direction, thus maintaining close contact with the inner wall of the precast hollow pipe pile.

[0023] S400: Pour reinforced concrete foundation to complete the overall installation of the pull-out structure.

[0024] Furthermore, step S100 also includes the following steps:

[0025] S101: Place the installation auxiliary equipment near the installed precast hollow pipe pile, manually control the closing of the gripper, place the diamond anchoring mechanism and the upper end cap plate into the positioning groove of the anchoring mechanism and the positioning groove of the end plate, and at the same time place the threaded steel pipe into the screw slot and clamp it with the fastening screw.

[0026] S102: By rotating the handle, the screw positioning unit is controlled to move downward, thereby driving the threaded steel pipe to move downward through the built-in smooth rod connecting hole;

[0027] S103: The bottom end of the threaded steel pipe is welded to the bottom connecting sleeve by manual welding, and then the lower end cap plate is welded to the bottom end of the threaded steel pipe.

[0028] S104: Manually open the grippers to free the diamond-shaped anchoring mechanism. At this time, control the simultaneous rotation of the handle to make the screw positioning unit and the anchoring mechanism positioning unit move downwards at the same time. Then, when the anchoring mechanism positioning unit contacts the upper end of the precast hollow pipe pile, stop rotating the crank handle of the anchoring mechanism positioning unit and continue rotating the handle to control the screw positioning unit to move downwards until the pull-out structure is fully inserted into the precast hollow pipe pile, thus completing the installation.

[0029] In summary, compared with the prior art, the above-described technical solutions conceived by this invention can achieve the following beneficial effects:

[0030] 1. The present invention provides an anti-pull-out connection pile structure for foundation slabs. By employing a diamond-shaped anchoring mechanism fitted over a threaded steel pipe, the downward screwing of the top fastening nut expands the diamond-shaped anchoring mechanism, maintaining close contact with the inner wall of the precast hollow pipe pile. This improves the reliability of the fixation between the threaded steel pipe and the side wall of the pipe pile. Simultaneously, concrete is poured. When the foundation layer moves upward due to buoyancy, the upper end cap plate experiences an upward force, which is transmitted through the nut to the threaded steel pipe. This force is then transmitted through the centrally located threaded steel pipe to the diamond-shaped anchoring mechanism, and subsequently to the pre-embedded precast hollow pipe pile. This avoids the technical problem of manually peeling the reinforcing bar connection section from the precast hollow pipe pile, as required in existing technologies. It effectively solves the technical problem of easily cutting the reinforcing bar during the cutting process of the precast hollow pipe pile, leading to construction difficulties. At the same time, it reduces the complexity of the construction process during pile splicing and cutting, solves the problem of poor consistency, and reduces the workload of on-site reinforcing bar binding. While ensuring the connection's firmness, it also improves the standardization of operations and increases construction efficiency to a certain extent.

[0031] 2. The present invention provides a pull-out connecting pile structure for a foundation slab. By setting a second-level connection node with the reinforced concrete foundation, the connection contact points between the pull-out structure and the reinforced concrete foundation are effectively increased, thereby improving the pull-out strength. In use, the upward movement of the reinforced concrete foundation causes the upper end cap plate, which serves as the first-level force transmission node, to move upward, and at the same time causes the foundation connecting steel bars, which serve as the second-level force transmission node, to move upward. Under the action of the two-level force transmission nodes, the upward buoyancy force is transmitted to the threaded steel pipe, then to the rhomboid anchoring mechanism, and finally to the precast hollow pipe pile, thereby effectively improving the force transmission efficiency and the stability of the tensile structure.

[0032] 3. The present invention provides an anti-tension connecting pile structure for foundation slabs, which uses a lower end cap plate fixedly installed at the lower end of the threaded steel pipe as a blocking element. During construction, concrete is poured only for the working section with a large bearing capacity, effectively saving the amount of concrete used while ensuring tensile performance. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of the overall structure of an anti-pull-out connecting pile structure for a foundation slab according to an embodiment of the present invention;

[0034] Figure 2 This is a schematic diagram of section aa of an anti-pull-out connecting pile structure for a foundation slab according to an embodiment of the present invention;

[0035] Figure 3 This is a schematic diagram of the bb section of an anti-uplift connection pile structure for a foundation slab according to an embodiment of the present invention;

[0036] Figure 4This is a schematic diagram of a rhomboid anchoring mechanism for an anti-pull-out connecting pile structure for a foundation slab, according to an embodiment of the present invention.

[0037] Figure 5 This is a flowchart illustrating a construction method for an anti-pull-out connecting pile structure for a foundation slab according to an embodiment of the present invention.

[0038] Figure 6 This is a schematic diagram of an auxiliary installation device for an anti-pull-out connecting pile structure for a foundation slab, according to an embodiment of the present invention.

[0039] Figure 7 This is a schematic diagram of a positioning and clamping mechanism for an anti-pull-out connecting pile structure for a foundation slab, according to an embodiment of the present invention.

[0040] Figure 8 This is a flowchart illustrating the use of S100, an anti-pull-out connecting pile structure for a foundation slab, according to an embodiment of the present invention.

[0041] In all the accompanying drawings, the same reference numerals denote the same technical features, specifically: 1-foundation connection reinforcement, 2-threaded steel pipe, 3-diamond-shaped anchoring mechanism, 301-connecting sleeve, 302-wall bracing rod, 303-force-applying plate, 304-built-in smooth rod connection hole, 4-precast hollow pipe pile, 5-lower end cap plate, 6-reinforced concrete foundation, 7-fastening nut, 8-upper end cap plate, 101-horizontal foot support, 102-support rod. 103-Rack and pinion section, 110-Screw positioning unit, 111-First transmission gear, 112-Screw slot, 113-Tightening screw, 114-First motion slide, 115-Rotating handle, 120-Anchoring mechanism positioning unit, 121-Second transmission gear, 122-Second motion slide, 123-Positioning gripper mechanism, 124-Anchoring mechanism positioning groove, 125-Rotating connecting shaft, 126-Gripper, 127-End plate positioning groove. Detailed Implementation

[0042] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention. Furthermore, the technical features involved in the various embodiments of this invention described below can be combined with each other as long as they do not conflict with each other.

[0043] like Figures 1-4 As shown in the embodiment of the present invention, the anti-uplift connection pile structure for foundation slab includes:

[0044] The precast hollow pipe pile 4, which is fixedly connected to the upper end of the reinforced concrete foundation 6 as the main anti-pull-out component, and the threaded steel pipe 2, which is concentric with the precast hollow pipe pile 4 and installed in the hole.

[0045] A rhomboid anchoring mechanism 3 is installed on the inner wall of the precast hollow pipe pile 4 and is slidably connected to the threaded steel pipe 2 for horizontal support and force transmission of the inner wall. It is evenly and continuously arranged along the threaded steel pipe. The rhomboid anchoring mechanism 3 includes a connecting sleeve 301 with an inner hole that is slidably connected to the threaded steel pipe 2, a wall-supporting connecting rod 302 that is rotatably connected to both sides of the connecting sleeve 301, and a force-applying plate 303 that is rotatably connected to the extended end of the wall-supporting connecting rod 302 and keeps in contact with the inner wall for providing support force. The connecting sleeve 301 at the bottom of the entire array of rhomboid anchoring mechanism 3 is fixedly connected to the threaded steel pipe 2.

[0046] The upper end cap plate 8 is sleeved on the upper end of the threaded steel pipe 2 and fixed to the top of the precast hollow pipe pile 4;

[0047] A fastening nut 7 that maintains a threaded connection with the external thread located on the outer wall of the threaded steel pipe 2;

[0048] Concrete filling the voids in the inner hole of the precast hollow pipe pile 4.

[0049] In this embodiment of the invention, by employing a diamond-shaped anchoring mechanism fitted onto the threaded steel pipe, the downward screwing of the top fastening nut expands the diamond-shaped anchoring mechanism, maintaining close contact with the inner wall of the precast hollow pipe pile. This improves the reliability of the fixation between the threaded steel pipe and the side wall of the pipe pile. Simultaneously, concrete is poured. When the foundation layer moves upward due to buoyancy, the upper end cap plate 8 experiences an upward force, which is transmitted from the nut to the threaded steel pipe 2. Subsequently, the force is transmitted through the centrally located threaded steel pipe 2 to the diamond-shaped anchoring mechanism 3, and then to the pre-embedded precast hollow pipe pile 4. This avoids the technical problem of manually peeling the reinforcing bar connection section from the precast hollow pipe pile 4, which is present in the prior art. It effectively solves the technical problem of easily cutting the reinforcing bar during the cutting process of the precast hollow pipe pile 4, leading to construction difficulties. At the same time, it reduces the complexity of the construction process during pile splicing and cutting, solves the technical problem of poor consistency, and reduces the workload of on-site reinforcing bar binding. While ensuring the connection firmness, it also improves the standardization of operations and construction efficiency to a certain extent.

[0050] In use, firstly, precast hollow pipe piles 4 are pre-embedded and cut to the required length according to actual working conditions. Then, threaded steel pipes 2 and diamond-shaped anchoring mechanisms are installed inside the precast hollow pipe piles 4. Next, concrete is poured into the precast hollow pipe piles 4. Then, the upper end cap plate 8 is installed above the precast hollow pipe piles 4, and then the fastening nut 7 is installed inside. Next, while the concrete is not yet set, the fastening nut 7 is tightened to lift the central sleeve upward, thereby driving the connecting sleeve 301 fixed to the lower end of the threaded steel pipe 2 to move upward. This reduces the distance between the two sets of connecting sleeves of the diamond-shaped anchoring mechanism, thereby reducing the angle between the wall support rod 302 and the horizontal direction. This causes the force-applying plates 303 on the left and right sides to move in the opposite direction, thus maintaining close contact with the inner wall of the precast hollow pipe piles 4. Finally, the reinforced concrete foundation 6 is poured, thus completing the overall installation of the pull-out structure.

[0051] like Figures 1-4 As shown in the embodiment of the present invention, the anti-uplift connection pile structure for foundation slab further includes:

[0052] The foundation connecting steel bar 1 is fixedly connected to the upper end of the threaded steel pipe 2.

[0053] In this embodiment of the invention, by setting a second-level connection node with the reinforced concrete foundation, the number of connection points between the pull-out structure and the reinforced concrete foundation is effectively increased, thereby improving the pull-out strength. During use, the upward movement of the reinforced concrete foundation 6 causes the upper end cap plate 8, which serves as the first-level force transmission node, to move upward, and at the same time causes the foundation connecting steel bar 1, which serves as the second-level force transmission node, to move upward. Under the action of the two-level force transmission nodes, the upward buoyancy force is transmitted to the threaded steel pipe 2, and then to the diamond anchoring mechanism 3, and then to the precast hollow pipe pile 4, thereby effectively improving the force transmission efficiency and the stability of the tensile structure.

[0054] In an embodiment of the present invention, the anti-uplift connection pile structure for a foundation slab further includes:

[0055] The lower end cap plate 5 is fixedly installed at the lower end of the threaded steel pipe 2.

[0056] In this embodiment of the invention, by using the lower end cap plate 5 fixedly installed at the lower end of the threaded steel pipe 2 as a blocking device, during the construction process, concrete is poured only for the working section with a large bearing capacity, which effectively saves the amount of concrete used while ensuring tensile performance.

[0057] In the real-time example of the present invention, the connection between the two ends of the threaded steel pipe 2 and the foundation connecting steel bar 1 and the lower end cap plate 5 is all fixed by welding.

[0058] In a real-world example of the present invention, the threaded steel pipe 2 has a casting cavity at its center, and concrete is poured into the casting cavity.

[0059] In a real-world example of the present invention, the outer diameter of the threaded steel pipe 2 is smaller than the inner diameter of the precast hollow pipe pile.

[0060] In a real-time example of the present invention, the inner wall of the precast hollow pipe pile is roughened.

[0061] like Figure 5 As shown, a construction method for an anti-uplift connection pile structure for a foundation slab is proposed, including the following steps:

[0062] S100: Pre-embed precast hollow pipe piles 4 and cut them to the required length according to the actual working conditions. Then, threaded steel pipes 2 and diamond-shaped anchoring mechanisms are installed inside the precast hollow pipe piles 4.

[0063] S200: Pour concrete into the pre-embedded hollow pipe pile 4, then install the upper end cap plate 8 on top of the pre-embedded hollow pipe pile 4, and then install the fastening nut 7 inside.

[0064] S300: Tightening the fastening nut 7 while the concrete is not yet set causes the central sleeve to lift upwards, thereby causing the connecting sleeve 301, which is fixedly connected to the lower end of the threaded steel pipe 2, to move upwards. This reduces the distance between the two sets of connecting sleeves of the diamond anchoring mechanism, thereby reducing the angle between the wall support rod 302 and the horizontal direction. This causes the force-applying plates 303 on the left and right sides to move in the opposite direction, thus maintaining close contact with the inner wall of the precast hollow pipe pile 4.

[0065] S400: Pour reinforced concrete foundation 6 to complete the overall installation of the pull-out structure.

[0066] like Figure 6 , Figure 7 As shown, in order to solve the technical problem of difficult vertical installation of multiple parts in the actual construction process of this invention, an installation auxiliary device is proposed, comprising:

[0067] A horizontal foot support (101) is placed horizontally on the ground to help stabilize the foundation of the equipment body; a support rod (102) is fixedly connected to the horizontal foot support (101); a rack part (103) is provided on the back side of the support rod (102); a screw positioning unit (110) is provided with a first motion groove (114) that is slidably connected to the support rod (102); and an anchoring mechanism positioning unit (120) is provided with a second motion groove (122) that is slidably connected to the support rod (102).

[0068] The front end of the screw positioning unit (110) is provided with a screw slot (112) for engaging the threaded steel pipe (2) and a fastening screw (113), and the rear end of the screw positioning unit (110) is provided with a first transmission gear (111) that meshes with the rack part (103) for transmission, and a rotating handle (115) for manual adjustment is fixedly connected to the central shaft of the first transmission gear (111).

[0069] The anchoring mechanism positioning unit (120) is provided with a positioning gripper mechanism at the front end and a second transmission gear (121) that meshes with the rack part (103) at the rear end of the anchoring mechanism positioning unit (120), and a rotating handle that is fixedly connected to the central axis of the second transmission gear (121).

[0070] The positioning gripper mechanism (123) includes a pair of grippers (126) rotatably connected by a rotating connecting shaft (125). After the two grippers (126) are clamped together, a space is left at the center for temporary clamping. Rhomboid anchoring mechanism (3) The anchoring mechanism positioning groove (124) and the end plate positioning groove (127) for temporarily clamping and positioning the upper end cap end plate (8).

[0071] In this embodiment of the invention, step S100 further includes the following steps:

[0072] S101: Place the installation auxiliary equipment near the installed precast hollow pipe pile 4, manually control the closing of the clamp 126, place the diamond anchoring mechanism and the upper end cap plate 8 inside the anchoring mechanism positioning groove 124 and the end plate positioning groove 127, and at the same time place the threaded steel pipe 2 in the screw slot 112 and clamp it with the fastening screw 113;

[0073] S102: By rotating the rotating handle 115, the screw positioning unit 110 is controlled to move downward, thereby driving the threaded steel pipe to move downward through the built-in smooth rod connecting hole 304;

[0074] S103: The bottom end of the threaded steel pipe 2 is welded to the bottom connecting sleeve 301 by manual welding, and then the lower end cap plate 5 is welded to the bottom end of the threaded steel pipe 2.

[0075] S104: Manually open the clamp 126 to put the diamond-shaped anchoring mechanism 3 in a free state. At this time, control the simultaneous rotation of the rotating handle 115 to make the screw positioning unit 110 and the anchoring mechanism positioning unit 120 move downwards at the same time. Then, when the anchoring mechanism positioning unit 120 contacts the upper end of the precast hollow pipe pile 4, stop rotating the crank handle of the anchoring mechanism positioning unit 120 and continue to rotate the rotating handle 115 to control the screw positioning unit 110 to move downwards until the pull-out structure is fully inserted into the precast hollow pipe pile 4, and the installation is completed.

[0076] Those skilled in the art will readily understand that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A tension-resistant connecting pile structure for a foundation slab, characterized in that, include: The precast hollow pipe pile (4), which is fixedly connected to the upper end of the reinforced concrete foundation (6) as the main tensile member, and the threaded steel pipe (2), which is concentric with the precast hollow pipe pile (4) and installed in the hole. A rhomboid anchoring mechanism (3) is installed in the inner hole of the precast hollow pipe pile (4) and is slidably connected to the threaded steel pipe (2) for horizontal support and force transmission of the inner wall. It is evenly and continuously arranged along the threaded steel pipe. The rhomboid anchoring mechanism (3) includes a connecting sleeve (301) that is slidably connected to the inner hole of the threaded steel pipe (2), a wall-supporting connecting rod (302) that is rotatably connected to both sides of the connecting sleeve (301), and a force-applying plate (303) that is rotatably connected to the extended end of the wall-supporting connecting rod (302) and keeps in contact with the inner wall for providing support force. The connecting sleeve (301) at the bottom of the entire rhomboid anchoring mechanism (3) array is fixedly connected to the threaded steel pipe (2). The upper end cap plate (8) is sleeved on the upper end of the threaded steel pipe (2) and fixed to the top of the precast hollow pipe pile (4). A fastening nut (7) that maintains a threaded connection with the external thread on the outer wall of the threaded steel pipe (2); Concrete filling the voids in the inner hole of the precast hollow pipe pile (4); The diamond-shaped anchoring mechanism (3) and the threaded steel pipe (2) are rigidly fixed in advance by auxiliary installation equipment before entering the precast hollow pipe pile (4).

2. The anti-uplift connection pile structure for foundation slab according to claim 1, characterized in that, Also includes: The foundation connecting steel bar (1) is fixedly connected to the upper end of the threaded steel pipe (2).

3. The anti-uplift connection pile structure for foundation slab according to claim 2, characterized in that, Also includes: The lower end cap plate (5) is fixedly installed at the lower end of the threaded steel pipe (2).

4. The anti-uplift connection pile structure for foundation slab according to claim 3, characterized in that: The connection between the two ends of the threaded steel pipe (2) and the foundation connecting steel bar (1) and the lower end cap plate (5) is fixed by welding.

5. A tension-resistant connecting pile structure for a foundation slab according to any one of claims 4, characterized in that: The threaded steel pipe (2) has a casting cavity at its center, and concrete is poured into the casting cavity.

6. A pull-out connecting pile structure for a foundation slab according to any one of claims 5, characterized in that: The outer diameter of the threaded steel pipe (2) is smaller than the inner diameter of the precast hollow pipe pile.

7. The anti-uplift connection pile structure for foundation slab according to claim 6, characterized in that: The inner wall of the precast hollow pipe pile (4) is roughened.

8. A construction method for an anti-tension connecting pile structure for a foundation slab, applied to the anti-tension connecting pile structure for a foundation slab as described in claim 7, characterized in that, Includes the following steps: S100: First, the precast hollow pipe pile (4) is pre-embedded and the required length is cut according to the actual working conditions. Then, the threaded steel pipe (2) and the diamond anchoring mechanism are installed inside the precast hollow pipe pile (4). S200: Pour concrete into the pre-embedded hollow pipe pile (4), then install the upper end cap plate (8) above the pre-embedded hollow pipe pile (4), and then install the fastening nut (7) inside; S300: Tightening the fastening nut (7) in the uncured state of the concrete causes the threaded steel pipe (2) to be lifted upward, thereby causing the connecting sleeve (301) fixedly connected to the lower end of the threaded steel pipe (2) to move upward, thereby reducing the distance between the two sets of connecting sleeves of the diamond anchoring mechanism, thereby reducing the angle between the wall support rod (302) and the horizontal direction, causing the force application plates (303) on the left and right sides to move in the opposite direction, thereby maintaining close contact with the inner wall of the precast hollow pipe pile (4); S400: Pour reinforced concrete foundation (6) to complete the overall installation of the pull-out structure.

9. A construction method for an anti-uplift connecting pile structure for a foundation slab according to claim 8, characterized in that, Step S100 further includes: S101: Place the auxiliary installation equipment near the installed precast hollow pipe pile (4), manually cooperate with the control gripper (126) to close, place the diamond anchoring mechanism and the upper end cap plate (8) inside the anchoring mechanism positioning groove (124) and the end plate positioning groove (127), and at the same time place the threaded steel pipe (2) in the screw slot (112) and clamp and position it with the fastening screw (113); The auxiliary installation equipment includes: a horizontal foot support (101) placed horizontally on the ground to stabilize the foundation of the auxiliary equipment body; a support rod (102) fixedly connected to the horizontal foot support (101); a rack portion (103) provided on the back side of the support rod (102); a screw positioning unit (110) provided with a first motion groove (114) slidably connected to the support rod (102); and an anchoring mechanism positioning unit (120) provided with a second motion groove (122) slidably connected to the support rod (102). The front end of the screw positioning unit (110) is provided with a screw slot (112) for engaging the threaded steel pipe (2) and a fastening screw (113), and the rear end of the screw positioning unit (110) is provided with a first transmission gear (111) that meshes with the rack part (103) for transmission, and a rotating handle (115) for manual adjustment is fixedly connected to the central shaft of the first transmission gear (111). The anchoring mechanism positioning unit (120) is provided with a positioning gripper mechanism at the front end, and a second transmission gear (121) is provided at the rear end of the anchoring mechanism positioning unit (120) to maintain meshing transmission with the rack part (103), and a rotating handle is fixedly connected to the central axis of the second transmission gear (121). The positioning gripper mechanism (123) includes a pair of grippers (126) rotatably connected by a rotating connecting shaft (125). After the two grippers (126) are clamped together, there is an anchoring mechanism positioning groove (124) for temporarily clamping the rhomboid anchoring mechanism (3) and an end plate positioning groove (127) for temporarily clamping and positioning the upper end cap end plate (8). S102: By rotating the rotating handle (115), the screw positioning unit (110) is controlled to move downward, thereby driving the threaded steel pipe to move downward through the built-in smooth rod connecting hole (304). S103: The bottom end of the threaded steel pipe (2) is welded to the bottom connecting sleeve (301) by manual welding, and then the lower end cap plate (5) is welded to the bottom end of the threaded steel pipe (2). S104: Manually open the clamp (126) to put the diamond anchoring mechanism (3) in a free state. At this time, control the simultaneous rotation of the screw positioning unit (110) and the anchoring mechanism positioning unit (120) to make the screw positioning unit (110) and the anchoring mechanism positioning unit (120) move downward at the same time. Then, when the anchoring mechanism positioning unit (120) contacts the upper end of the precast hollow pipe pile (4), stop rotating the rotation of the anchoring mechanism positioning unit (120) (115) and continue to rotate the rotation of the screw positioning unit (110) (115) to control the screw positioning unit (110) to move downward until the pull-out structure is fully inserted into the precast hollow pipe pile (4) to complete the installation.

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