Uplift pile double-row enclosure structure

Abstract

The invention relates to the technical field of enclosure structures, in particular to an uplift pile double-row enclosure structure which comprises double rows of enclosure piles, an uplift device is arranged on the outer walls of the double rows of enclosure piles, the double rows of enclosure piles are arranged in a foundation pit, and the uplift device comprises a frame fixedly mounted on the outer walls of the double rows of enclosure piles; the hollow cylinder is fixedly mounted on the inner wall of the frame, and an internal thread through hole is formed in the inner wall of the hollow cylinder; the screw rod is in threaded connection with the interior of the threaded through hole in the hollow cylinder; and the butt joint rod is fixedly installed at one end of the lead screw, a cross-shaped groove driving connector is formed in the face, away from the lead screw, of the butt joint rod, through spiral drilling, the concrete pile and the surrounding soil body are tightly engaged, the friction resistance between the pile and the soil is improved, and therefore the overall anti-pulling capacity of the double-row fender post is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of enclosing structures, and specifically, to a double-row retaining structure with tension piles. Background Art

[0002] A double-row retaining structure with tension piles is a foundation pit support system composed of two rows of vertical piles, mainly used to resist lateral earth pressure and prevent the bottom of the foundation pit from heaving or floating as a whole.

[0003] After retrieval, a frame-type double-row pile cement-soil wall foundation pit retaining structure according to CN109403347B disclosed by the publication number is arranged in the soil around the foundation pit, and includes a frame-type double-row pile unit and a cement-soil mixing pile water-stop curtain; the cement-soil mixing pile water-stop curtain is arranged along the edge of the foundation pit with a spacing from the edge of the foundation pit; the cement-soil mixing pile water-stop curtain is composed of a group of cement-soil mixing piles, and adjacent cement-soil mixing piles are arranged in an overlapping manner; there is a group of frame-type double-row pile units, which are arranged in parallel and at intervals along the edge of the foundation pit; each frame-type double-row pile unit includes a front row single-arm concrete pile, a rear row single-arm concrete pile and a horizontal connecting plate; the front row single-arm concrete pile is inserted into the soil around the foundation pit, close to the foundation pit side; the rear row single-arm concrete pile is inserted into the cement-soil mixing pile water-stop curtain. This patent solves the technical problems of the traditional concrete retaining structure being environmentally unfriendly in construction and wasting materials, as well as the technical problems of the steel section pile or steel sheet pile retaining structure having a small flexural rigidity and being unable to effectively control the support deformation.

[0004] In the above patent, although it solves the technical problems of environmentally unfriendly construction and material waste, during the construction process of the foundation pit retaining structure, the tension piles need to be inserted into pre-drilled holes that have been drilled in advance. If the tension piles are directly placed into the pre-drilled holes, there will be a situation where the friction between the tension piles and the hole wall is insufficient, resulting in the tension piles being unable to firmly combine with the surrounding soil, reducing their bearing capacity and protection ability, and thus affecting the stability and protection effect of the tension piles.

[0005] Based on this, the present invention discloses a double-row retaining structure with tension piles. Summary of the Invention

[0006] To solve the problem of insufficient friction between the tension piles and the hole wall caused by directly placing the tension piles into the pre-drilled holes in the background art, and to find a way to conveniently fix the tension piles and ensure sufficient friction between the tension piles and the pre-drilled holes, the present invention provides a double-row retaining structure with tension piles, which includes double-row retaining piles fixed in the foundation pit; In this solution, in order to enhance the anti-pulling effect of the double-row retaining piles, it is necessary for the concrete piles with a rough surface to be in full contact with the inner wall of the pre-drilled holes and the soil to be compacted, and for the concrete piles to enter the pre-drilled holes in a spiral motion. As a further improvement of this technical solution, a frame is fixedly installed on the double-row retaining piles. An inner hollow cylinder is fixedly installed on the inner wall of the frame. An internally threaded through hole is provided on the inner wall of the inner hollow cylinder. A lead screw is threadedly connected in the internally threaded through hole. One end of the lead screw is fixedly installed with a docking rod, and the other end of the lead screw is fixedly installed with a cylindrical rod. The cylindrical rod is fixedly connected to the concrete pile.

[0007] On this basis, in order to cooperate with the concrete pile to achieve spiral movement, a basic support is required. As a further improvement of this technical solution, a disc is rotatably installed on the outer wall of the inner hollow cylinder. A number of bearing brackets are arranged on the surface of the disc. A roller is rotatably installed on the bearing bracket. An activity groove is provided on the surface of the inner hollow cylinder. A protective sleeve is rotatably installed on the cylindrical rod. A rectangular plate is fixedly installed on the protective sleeve. The rectangular plate moves along the direction of the activity groove.

[0008] In another solution, in order to ensure that the area around the pre-drilled hole does not collapse due to vibration during construction when the concrete pile is screwed in, it is necessary to compact the area around the pre-drilled hole. Secondly, during the process of recovering the concrete pile, the components for compacting the area around the pre-drilled hole also need to be quickly recovered. As a further improvement of this technical solution, the fastening device includes a fixed frame, a movable rod and a propulsion disc. The fixed frame is fixedly installed on the outer wall of the frame. The movable rod is slidably installed on the inner wall of the fixed frame. The propulsion disc is fixedly installed on the surface of the movable rod.

[0009] Since it is necessary to quickly relieve the pressure applied to the area around the pre-drilled hole, the movable rod and the rectangular plate need to be linked. As a further improvement of this technical solution, a convex seat is fixedly installed on the side of the propulsion disc away from the fixed frame. A sliding tube is slidably arranged on the convex seat. A compression spring is arranged between the convex seat and the sliding tube on the convex seat. The sliding tube is slidably connected to the convex seat through the compression spring. A contact disc is fixedly installed on the side of the sliding tube away from the propulsion disc. In the third solution, in order to improve the stability of the double-row retaining piles when they are screwed into the pre-drilled hole, so as to ensure the stable progress of the anti-pulling effect operation. As a further improvement of this technical solution, the reinforcement device includes a carrying box. The carrying box is fixedly installed on the surface of the double-row retaining piles. A vertical rod is fixedly installed inside the carrying box. A lifting tube is slidably arranged on the vertical rod. A spring is arranged between the carrying box and the lifting tube on the carrying box. The lifting tube is slidably connected to the vertical rod through the spring. An L-shaped plate is fixedly installed on the outer wall of the lifting tube. A chute and a serrated groove are provided on the L-shaped plate.

[0010] As a further improvement of the technical solution, a push rod is slidably installed in the chute, and a C-shaped plate is fixedly installed on the circumferential surface of the push rod.

[0011] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. In the double-row retaining structure of the uplift pile, the protective sleeve and the rollers provide additional support for the concrete pile, realizing double-end support for the concrete pile, correcting the axis angle of the concrete pile in real time, preventing the concrete pile from shifting and contacting the foundation pit edge, and using the rollers to reduce the wear on the surface of the concrete pile. At the same time, the surface-rough concrete pile is screwed into the pre-drilled hole to compact the surrounding soil, realizing a tight bite between the concrete pile and the surrounding soil in the pre-drilled hole, increasing the frictional resistance between the pile and the soil, and thus enhancing the overall uplift resistance of the double-row retaining piles.

[0012] 2. In the double-row retaining structure of the uplift pile, the contact plate applies uniform pressure to the area around the pre-drilled hole, realizing that the contact plate compacts the area around the pre-drilled hole, preventing the inner wall of the pre-drilled hole from becoming loose due to the vibration during the screwing of the concrete pile, thus ensuring the safety during the screwing of the concrete pile. At the same time, the contact plate gradually reduces the pressure exerted on the side wall of the foundation pit during the recovery of the concrete pile, preventing the soil from rebounding too quickly, realizing the linkage effect of the rectangular plate and the movable rod, which can not only improve the overall efficiency of recovering the concrete pile, but also prevent local collapse caused by too fast soil rebound.

[0013] 3. In the double-row retaining structure of the uplift pile, the deformed rubber sheet is separated from the vertical rod and quickly recovers under its own elastic action. By setting the rubber sheet on the C-shaped plate, the stability effect when the L-shaped plate meshes with the side wall of the foundation pit is enhanced, ensuring that the stability of the double-row retaining piles themselves is strengthened during the process of screwing in the concrete pile, guaranteeing the safety and reliability of the construction process. At the same time, the movement of the push rod drives the L-shaped plate and the C-shaped plate to rise synchronously, realizing that by flexibly adjusting the height of the L-shaped plate, it is ensured that the double-row retaining piles always maintain a stable contact with the side wall of the foundation pit, improving the stability of the overall structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a schematic diagram of the overall structure of the frame of the present invention; Figure 3 It is a schematic diagram of the structure of the hollow cylinder of the present invention; Figure 4 It is a schematic diagram of the structure of the cylindrical rod and the concrete pile of the present invention; Figure 5 It is a schematic diagram of the structure of the frame and the fixing frame of the present invention; Figure 6 It is a schematic diagram of the structure of the fastening device of the present invention; Figure 7Schematic diagram of the convex seat and sliding tube of the present invention; Figure 8 Schematic diagram of the double-row retaining piles and the carrying box of the present invention; Figure 9 Internal structural schematic diagram of the reinforcement device of the present invention.

[0015] The meanings of each label in the figure are as follows: 1. Double-row retaining piles; 2. Frame; 3. Hollow cylinder; 4. Screw rod; 5. Docking rod; 6. Cylindrical rod; 7. Concrete pile; 8. Disc; 9. Roller; 10. Protective sleeve; 11. Rectangular plate; 21. Fixed frame; 22. Movable rod; 23. Propelling disc; 24. Convex seat; 25. Sliding tube; 26. Compression spring; 27. Contact disc; 31. Carrying box; 32. Upright rod; 33. Lifting tube; 34. Spring; 35. L-shaped plate; 36. Push rod; 37. C-shaped plate. Detailed implementation manners

[0016] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0017] In the existing foundation pit retaining engineering, the anti-pulling piles are usually directly placed into the pre-drilled holes, resulting in the problem of insufficient friction between the anti-pulling piles and the hole wall.

[0018] Therefore, the present invention provides an anti-pulling pile double-row retaining structure. Refer to Figures 1 - 4 As shown, it includes double-row retaining piles 1. Among them, an anti-pulling device is provided on the outer wall of the double-row retaining piles 1. The double-row retaining piles 1 are arranged in the foundation pit. The anti-pulling device includes: a frame 2, which is fixedly installed on the outer wall of the double-row retaining piles 1; a hollow cylinder 3, which is fixedly installed on the inner wall of the frame 2, and an internal thread through hole is provided on the inner wall of the hollow cylinder 3; a screw rod 4, which is threadedly connected in the internal thread through hole of the hollow cylinder 3; a docking rod 5, which is fixedly installed at one end of the screw rod 4, and a cross-slot drive interface is provided on the side of the docking rod 5 away from the screw rod 4, and the cross-slot drive interface is used to match with a cross-screwdriver head; a cylindrical rod 6, which is fixedly installed at the other end of the screw rod 4; a concrete pile 7, which is fixedly installed on the side of the cylindrical rod 6 away from the screw rod 4. Through spiral drilling, the concrete pile 7 forms a tight bite with the surrounding soil, improving the frictional resistance between the pile and the soil, thereby enhancing the overall anti-pulling ability of the double-row retaining piles 1.

[0019] A disc 8 is rotatably installed on a side of the hollow cylinder 3 away from the docking rod 5. A number of bearing brackets are provided on the outer wall of the disc 8, and rollers 9 are rotatably installed on the inner walls of the number of bearing brackets. The rollers 9 are in contact with the circumferential surface of the concrete pile 7. The force applied by the rotation of the concrete pile 7 will act on the disc 8 through the rollers 9, realizing the synchronous rotation of the concrete pile 7 driving the disc 8 and preventing the path deviation of the concrete pile 7.

[0020] A protective sleeve 10 is rotatably installed on the circumferential surface of the cylindrical rod 6. A rectangular plate 11 is fixedly installed on the circumferential surface of the protective sleeve 10. An activity groove is formed on the circumferential surface of the hollow cylinder 3. The rectangular plate 11 is in contact with the activity groove. By providing double-end support for the concrete pile 7, the axis angle of the concrete pile 7 can be corrected in real time, avoiding the accidental contact between the concrete pile 7 and the edge of the foundation pit due to deviation.

[0021] The circumferential surface of the protective sleeve 10 is in contact with the inner wall of the hollow cylinder 3, and the inner wall of the protective sleeve 10 is in contact with the circumferential surface of the concrete pile 7. By the contact between the protective sleeve 10 and the inner wall of the hollow cylinder 3, it can not only transfer the support provided by the hollow cylinder 3 for the concrete pile 7, but also prevent the wear caused by the friction between the concrete pile 7 and the hollow cylinder 3.

[0022] During operation, pre-drilled holes are drilled at the specified positions, and then the double-row retaining piles 1 are fixed at the edge of the foundation pit. After the double-row retaining piles 1 are installed in place, the construction workers use an electric drill equipped with a cross screwdriver bit, insert the bit into the cross-slot drive interface of the docking rod 5. Start the electric drill, the rotation of the docking rod 5 drives the screw rod 4 to rotate, the rotation of the screw rod 4 drives the cylindrical rod 6 to rotate, and the rotation of the cylindrical rod 6 drives the concrete pile 7 to rotate. At the same time, during the rotation of the screw rod 4, it pushes the cylindrical rod 6 to move towards the pre-drilled hole direction, and the movement of the cylindrical rod 6 drives the concrete pile 7 to move towards the pre-drilled hole direction, so that the concrete pile 7 rotates around its own axis under the action of rotational drive and moves along the axial direction under the action of axial thrust. When the concrete pile 7 contacts the pre-drilled hole, the outer wall of the concrete pile 7 continuously frictions with the soil in the pre-drilled hole, compacts the surrounding soil through spiral movement, and makes the concrete pile 7 closely combine with the pre-drilled hole until the concrete pile 7 reaches the preset depth to complete the fixation. Through spiral drilling, the concrete pile 7 forms a tight bite with the surrounding soil, improves the frictional resistance between the pile and the soil, and thus enhances the overall uplift resistance of the double-row retaining piles 1. During the process of the concrete pile 7 being screwed into the pre-drilled hole, the movement of the cylindrical rod 6 drives the protective sleeve 10 to move synchronously. The protective sleeve 10 provides stable radial support for one end of the concrete pile 7. At the same time, the movement of the concrete pile 7 drives the roller 9 to rotate, and the roller 9 provides stable support for the other end of the concrete pile 7. When the roller 9 provides support for the concrete pile 7, the force exerted by the rotation of the concrete pile 7 will act on the disc 8 through the roller 9, so that the rotation of the concrete pile 7 drives the disc 8 to rotate synchronously, preventing the concrete pile 7 from deviating from its path. At the same time, the movement of the protective sleeve 10 drives the rectangular plate 11 to slide in the movable groove. Since the movable groove restricts the translational freedom of the rectangular plate 11, the protective sleeve 10 can only move axially during the movement and will not rotate with the cylindrical rod 6. By providing double-end support for the concrete pile 7, the axis angle of the concrete pile 7 can be corrected in real time, avoiding the concrete pile 7 from deviating and accidentally contacting the edge of the foundation pit.

[0023] Further, as shown in Figures 5 - 7 shown, a fastening device for improving the operation stability of the concrete pile 7 is provided on the outer wall of the frame 2. The fastening device includes a fixed frame 21, a movable rod 22 and a propulsion disc 23. The fixed frame 21 is fixedly installed on the outer wall of the frame 2, the movable rod 22 is slidably installed on the inner wall of the fixed frame 21, and the propulsion disc 23 is fixedly installed on the side of the movable rod 22 away from the rectangular plate 11. Through the linkage effect between the rectangular plate 11 and the movable rod 22, both the overall efficiency of retrieving the concrete pile 7 can be improved and the rapid soil rebound causing local collapse can be prevented.

[0024] A convex seat 24 is fixedly installed on one side of the propulsion disc 23 away from the fixed frame 21, and a sliding tube 25 is slidably arranged on the convex seat 24. A compression spring 26 is arranged on the convex seat 24 between the convex seat 24 and the sliding tube 25. The sliding tube 25 is slidably connected to the convex seat 24 through the compression spring 26. The area around the pre-drilled hole is compacted through the contact disc 27 to prevent the vibration when the concrete pile 7 is screwed in and cause the hole wall to loosen, thereby improving the safety of the foundation pit retaining construction.

[0025] During operation, the rectangular plate 11 moves toward the fixed frame 21 and contacts the movable rod 22, and pushes the movable rod 22 to move in the direction away from the frame 2. The movement of the movable rod 22 drives the propulsion plate 23 to move synchronously, the movement of the propulsion plate 23 drives the convex seat 24 to move synchronously, the movement of the convex seat 24 drives the sliding tube 25 to move synchronously, and the movement of the sliding tube 25 drives the contact plate 27 to move synchronously; when the contact plate 27 contacts the side wall of the foundation pit, the contact plate 27 is blocked by the side wall of the foundation pit and stops moving, and the sliding tube 25 stops accordingly. At this time, the convex seat 24 continues to move to compress the compression spring 26, and the deformed compression spring 26 applies a gradually increasing reaction force to the sliding tube 25, and the sliding tube 25 transmits the pressure to the contact plate 27, so that the contact plate 27 applies a uniform pressure to the surrounding area of the pre-drilled hole, and the contact plate 27 compacts the surrounding area of the pre-drilled hole to prevent the concrete pile 7 from being screwed in. The vibration causes the hole wall to relax, thereby improving the safety of foundation pit retaining construction. When recovering the concrete pile 7, the construction personnel use the electric drill to reversely rotate the docking rod 5 to drive the screw rod 4 to reset. The screw rod 4 resets and drives the cylindrical rod 6 to move to the initial position, so that the concrete pile 7 is spirally pushed out of the pre-drilled hole. The protective sleeve 10 is reset synchronously with the cylindrical rod 6. The reset of the protective sleeve 10 drives the rectangular plate 11 to move to the initial position. The rectangular plate 11 gradually reduces the force applied to the movable rod 22 during the movement, so that the force applied by the contact plate 27 to the side wall of the foundation pit is gradually reduced to prevent the soil from rebounding too quickly; when the concrete pile 7 is completely separated from the pre-drilled hole, the compression spring 26 is completely restored, and the contact plate 27 is completely separated from the side wall of the foundation pit. Through the linkage effect of the rectangular plate 11 and the movable rod 22, the overall efficiency of recovering the concrete pile 7 can be improved, and the soil rebounding too quickly to cause local collapse can be prevented.

[0026] Among them, see Figures 8 - 9 As shown, the outer wall of the double-row retaining pile 1 is provided with a reinforcement device, which includes a carrying box 31, which is fixedly installed on the outer wall of the double-row retaining pile 1, and a vertical pole 32 is fixedly installed inside the carrying box 31, and a lifting tube 33 is slidably arranged on the vertical pole 32. A spring 34 is arranged on the carrying box 31 between the carrying box 31 and the lifting tube 33, and the lifting tube 33 is slidably connected to the vertical pole 32 through the spring 34. An L-shaped plate 35 is fixedly installed on the outer wall of the lifting tube 33. By flexibly adjusting the height of the L-shaped plate 35, it is ensured that the double-row retaining pile 1 always maintains a firm contact with the side wall of the foundation pit, thereby improving the stability of the overall structure.

[0027] The L-shaped plate 35 contacts the inner wall of the carrying box 31. A chute is provided at the top of the L-shaped plate 35, and a serrated groove is provided on the outer wall of the L-shaped plate 35. The serrated groove of the L-shaped plate 35 contacts the foundation pit. By providing the serrated groove, the friction between the L-shaped plate 35 and the side wall of the foundation pit is increased, which helps to enhance the stability effect.

[0028] A push rod 36 is slidably installed in the chute of the L-shaped plate 35. A C-shaped plate 37 is fixedly installed on the circumferential surface of the push rod 36. By providing the push rod 36, it is convenient for construction workers to quickly adjust the position of the C-shaped plate 37, effectively saving the adjustment time.

[0029] A rubber sheet is provided on the side of the C-shaped plate 37 close to the vertical rod 32, and the rubber sheet contacts the circumferential surface of the vertical rod 32. By providing the rubber sheet on the C-shaped plate 37, the stability effect when the L-shaped plate 35 meshes with the side wall of the foundation pit is enhanced, ensuring that the stability of the double-row retaining pile 1 itself is strengthened during the process of screwing into the concrete pile 7, and ensuring a safe and reliable construction process.

[0030] During operation, the spring 34 in a deformed state exerts a downward pulling force on the lifting pipe 33, and this pulling force is transmitted to the L-shaped plate 35 through the lifting pipe 33, causing the serrated groove of the L-shaped plate 35 to tightly mesh with the side wall of the foundation pit. At the same time, the side wall of the foundation pit will exert a reverse supporting force on the L-shaped plate 35, enhancing the stability of the top of the double-row retaining pile 1; when the height of the foundation pit needs to be adjusted, the construction worker first pulls the push rod 36 outward, causing it to drive the C-shaped plate 37 to move away from the vertical rod 32, and the rubber sheet on the C-shaped plate 37 thus disengages from contact with the vertical rod 32; the construction worker then uses a jack to lift the L-shaped plate 35, causing the L-shaped plate 35 to rise along the direction of the vertical rod 32, and the L-shaped plate 35 disengages from contact with the foundation pit during the rising process. At the same time, the L-shaped plate 35 drives the lifting pipe 33 to rise, and the lifting pipe 33 stretches the spring 34 during the rising process. When the height adjustment of the foundation pit is completed, the L-shaped plate 35 is slowly lowered by the jack, so that it tightly meshes with the side wall of the foundation pit again under the action of the pulling force of the spring 34. By flexibly adjusting the height of the L-shaped plate 35 with the help of tools, it is ensured that the double-row retaining pile 1 always maintains a stable contact with the side wall of the foundation pit, improving the stability of the overall structure, ensuring that the stability of the double-row retaining pile 1 itself is strengthened during the process of screwing into the concrete pile 7, and ensuring the safety and reliability of the construction process. After the adjustment is completed, the construction worker pushes the push rod 36 to reset, and the movement of the push rod 36 drives the C-shaped plate 37 to move towards the vertical rod 32. The resistance exerted by the vertical rod 32 on the rubber sheet causes the rubber sheet to be squeezed and deformed during the movement, and the deformed rubber sheet is in close contact with the vertical rod 32, enhancing the stability of the L-shaped plate 35 itself. By enhancing the stability of the lifting pipe 33 on the vertical rod 32, it is ensured that the stability of the double-row retaining pile 1 itself is strengthened during the process of screwing into the concrete pile 7, and ensuring the safety and reliability of the construction process.

[0031] In summary, the problem that the existing anti-pulling pile is directly placed into the pre-drilled hole, resulting in insufficient friction between the anti-pulling pile and the hole wall, is effectively solved.

[0032] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device.

[0033] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A double-row retaining structure of uplift piles, which comprises double-row retaining piles (1), and is characterized in that: Among them, an anti-pulling device and a reinforcement device are arranged on the outer wall of the double-row retaining piles (1), the double-row retaining piles (1) are arranged in a foundation pit, and the anti-pulling device includes: a frame (2), the frame (2) is fixedly installed on the outer wall of the double-row retaining piles (1); a hollow cylinder (3), the hollow cylinder (3) is fixedly installed on the inner wall of the frame (2), and an internally threaded through hole is formed in the inner wall of the hollow cylinder (3); a lead screw (4), the lead screw (4) is threadedly connected in the internally threaded through hole of the hollow cylinder (3); a docking rod (5), the docking rod (5) is fixedly installed at one end of the lead screw (4), a cross-slot drive interface is formed on the surface of the docking rod (5) away from the lead screw (4), and the cross-slot drive interface is used to match with a cross-screwdriver bit; a cylindrical rod (6), the cylindrical rod (6) is fixedly installed at the other end of the lead screw (4); a concrete pile (7), the concrete pile (7) is fixedly installed on the surface of the cylindrical rod (6) away from the lead screw (4).

2. The anti-pulling pile double-row retaining structure according to claim 1, wherein: A disc (8) is rotatably installed on the surface of the hollow cylinder (3) away from the docking rod (5), a plurality of bearing brackets are arranged on the outer wall of the disc (8), and a roller (9) is rotatably installed on the inner walls of the plurality of bearing brackets, and the roller (9) is in contact with the circumferential surface of the concrete pile (7).

3. The anti-pulling pile double-row retaining structure according to claim 2, wherein: A protective sleeve (10) is rotatably installed on the circumferential surface of the cylindrical rod (6), a rectangular plate (11) is fixedly installed on the circumferential surface of the protective sleeve (10), a movable groove is formed in the circumferential surface of the hollow cylinder (3), and the rectangular plate (11) is in contact with the movable groove.

4. The anti-pulling pile double-row retaining structure according to claim 3, characterized in that: The circumferential surface of the protective sleeve (10) is in contact with the inner wall of the hollow cylinder (3), and the inner wall of the protective sleeve (10) is in contact with the circumferential surface of the concrete pile (7); Among them, a fastening device for improving the operation stability of the concrete pile (7) is arranged on the outer wall of the frame (2).

5. The anti-pulling pile double-row retaining structure according to claim 4, characterized in that: The fastening device includes a fixing frame (21), a movable rod (22) and a propulsion disc (23), the fixing frame (21) is fixedly installed on the outer wall of the frame (2), the movable rod (22) is slidably installed in the inner wall of the fixing frame (21), and the propulsion disc (23) is fixedly installed on the surface of the movable rod (22) away from the rectangular plate (11).

6. The anti-pulling pile double-row retaining structure according to claim 5, characterized in that: A convex seat (24) is fixedly installed on the surface of the propulsion disc (23) away from the fixing frame (21), a sliding tube (25) is slidably arranged on the convex seat (24), a compression spring (26) is arranged between the convex seat (24) and the sliding tube (25) on the convex seat (24), the sliding tube (25) is slidably connected with the convex seat (24) through the compression spring (26), and a contact disc (27) is fixedly installed on the surface of the sliding tube (25) away from the propulsion disc (23).

7. The anti-pulling pile double-row retaining structure according to claim 6, characterized in that: The reinforcement device includes a mounting box (31) fixedly installed on the outer wall of the double-row retaining piles (1). A vertical rod (32) is fixedly installed inside the mounting box (31). A lifting pipe (33) is slidably arranged on the vertical rod (32). A spring (34) is arranged between the mounting box (31) and the lifting pipe (33) on the mounting box (31). The lifting pipe (33) is slidably connected to the vertical rod (32) through the spring (34). An L-shaped plate (35) is fixedly installed on the outer wall of the lifting pipe (33).

8. The anti-pulling pile double-row retaining structure according to claim 7, characterized in that: The L-shaped plate (35) is in contact with the inner wall of the mounting box (31). A chute is formed at the top of the L-shaped plate (35). A serrated groove is formed on the outer wall of the L-shaped plate (35). The serrated groove of the L-shaped plate (35) is in contact with the foundation pit.

9. The anti-pulling pile double-row retaining structure according to claim 7, characterized in that: A push rod (36) is slidably installed in the chute of the L-shaped plate (35). A C-shaped plate (37) is fixedly installed on the circumferential surface of the push rod (36).

10. The anti-pulling pile double-row retaining structure according to claim 9, characterized in that: A rubber sheet is arranged on the side of the C-shaped plate (37) close to the vertical rod (32). The rubber sheet is in contact with the circumferential surface of the vertical rod (32).

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