A composite foundation pile-pier connecting support system and a composite foundation construction method

Abstract

The application discloses a composite foundation pile-pier connecting and supporting system and a composite foundation construction method, and belongs to the technical field of composite foundations; the system comprises a spiral pile barrel arranged in a foundation, a connecting pile barrel is arranged at the upper end of the spiral pile barrel, a plurality of connecting and supporting arms which are adjustably arranged along the circumferential direction of the connecting pile barrel and extend along the radial direction of the connecting pile barrel are arranged at the upper end barrel port of the connecting pile barrel, an adjusting arm which is adjustably arranged along the length direction of the connecting and supporting arm is arranged on the connecting and supporting arm, and the adjacent connecting pile barrels are connected through connectors arranged at the overhanging ends of the adjusting arms. The connecting and supporting arms can be connected to form an integral whole through the adjustment of the adjusting arms, a plurality of spiral pile barrels can form an organic whole, the integral support of the foundation can be implemented, and the integral stability of the formed composite foundation can be ensured.

Description

Technical Field

[0001] This invention relates to the field of composite foundation technology, and more specifically, to a composite foundation pile-pier connection support system and a composite foundation construction method. Background Technology

[0002] Composite foundations refer to artificial foundations where, during foundation treatment, a portion of the soil is reinforced or replaced, or reinforcing materials are incorporated into the natural foundation. The reinforced zone consists of two parts: the matrix (natural or improved natural foundation soil) and the reinforcement. Under load, the matrix and the reinforcement share the load. Based on the load transfer mechanism, composite foundations are classified into two categories: vertically reinforced composite foundations and horizontally reinforced composite foundations. Vertically reinforced composite foundations are further divided into three types: granular material pile composite foundations, flexible pile composite foundations, and rigid pile composite foundations.

[0003] Among them, the screw pile composite foundation is a pile composite foundation composed of piles of different lengths. Under load, the additional stress in the foundation decreases with increasing depth. To more effectively utilize the bearing potential of the piles in the composite foundation, piles of different lengths can be used to adapt to the characteristic of the additional stress decreasing from top to bottom. During the pile driving operation, several sets of holes of different depths are pre-drilled on the foundation surface using drilling equipment. Then, screw piles are drilled into these pre-drilled holes using drill rods to support the foundation. During foundation support, as the drilling depth of the screw piles increases, the prestress generated by foundation settlement acts on the screw piles, which extend beyond the upper end of the foundation surface. Because each screw pile is independent, and each screw pile individually provides composite support to the foundation surface, multiple sets of screw piles cannot form an effective whole, and the composite foundation still has the problem of collapse, which has a certain impact on the overall stability of the foundation. Summary of the Invention

[0004] To address the aforementioned issues, this solution provides a composite foundation pile-pier connection support system and a composite foundation construction method. This solution utilizes the effective connection between multiple sets of helical piles to form an effective whole, thereby providing overall support for the foundation and ensuring the overall stability of the resulting composite foundation.

[0005] To achieve the above objectives, the technical solution provided by the present invention is as follows:

[0006] The present invention discloses a composite foundation pile-pier connection support system, comprising a spiral pile tube inserted into the foundation, a connecting pile tube provided at the upper end of the spiral pile tube, and multiple sets of connecting support arms arranged with adjustable positions along the circumferential direction and extending along the radial direction of the connecting pile tube at the upper end of the connecting pile tube. Adjustable support arms are provided on the connecting support arms with adjustable positions along the length direction of the connecting support arms. Adjacent connecting pile tubes are connected by connectors provided at the cantilever ends of the adjustable support arms.

[0007] Furthermore, a support turntable is concentrically arranged on the outer wall of the connecting pile cylinder, and a support arc plate is rotatably arranged on the support turntable. The cylinder core where the support arc plate is located is concentrically arranged with the support turntable. The arc end of the support arc plate is in contact with the outer wall of the connecting pile cylinder, and the other end away from the arc end of the support arc plate is hinged to the connecting support arm with the hinge axis arranged horizontally.

[0008] Furthermore, an adjustment track extends from the connecting support arm. The adjustment support arm includes a first adjustment roller located on both sides of the upper plate of the adjustment track and a second adjustment roller located on the lower plate of the adjustment track. The roller cores of the first and second adjustment rollers are arranged horizontally and perpendicular to the length direction of the adjustment track. The roller frames of the first and second adjustment rollers are connected as one unit.

[0009] Furthermore, the roller frame is provided with a rod arranged along the length of the connecting support arm, a spring is sleeved on the rod, a tensioning support plate is provided at the overhang end of the adjusting track, a tensioning nut and a tensioning screw are provided on the tensioning support plate, and the other end of the tensioning screw is connected to the spring.

[0010] Furthermore, the outer wall of the spiral pile tube is hinged with several pre-embedded anchor rods, which are connected to a flipping mechanism. The flipping mechanism drives the pre-embedded anchor rods to rotate around the hinge axis and extend into the soil foundation. The pre-embedded anchor rods are tubular, with grout discharge holes provided on the tube body. The pre-embedded anchor rods are connected to the grouting equipment.

[0011] Furthermore, the end of the pre-embedded anchor rod near the hinge shaft is connected to a connecting hose, and the other end of the connecting hose is connected to the grout discharge main pipe inside the helical pile cylinder. The grout discharge main pipe extends out of the upper end of the helical pile cylinder and is connected to the grout outlet of the grouting equipment.

[0012] Furthermore, the outer wall of the spiral pile tube is provided with a groove along its length, one end of the pre-embedded anchor rod is hinged to the bottom of the groove, the bottom of the groove is provided with an opening, and the flipping mechanism includes a flipping drive plate provided at the hinged end of the pre-embedded anchor rod. The flipping drive plate passes through the opening and extends into the spiral pile tube. The extended end of the flipping drive plate is inclined to the lower end of the spiral pile tube and is connected to the drive unit. The drive unit drives the flipping drive plate to rotate.

[0013] Furthermore, a slot is provided on the extended end of the flip drive plate, and the drive unit includes a drive rod that abuts against the bottom surface of the flip drive plate. A drive connecting rod is provided on the body of the drive rod, and the drive connecting rod passes through the slot and protrudes from the upper end of the spiral pile cylinder.

[0014] Furthermore, the device includes a rotary drive cylinder, with an insertion port on the upper outer wall of the helical pile cylinder and an insertion plate at the lower opening of the rotary drive cylinder, the insertion plate and the insertion port forming an insertion fit; a connecting cylinder is provided at one end of the drive connecting rod extending out of the helical pile cylinder, a connecting insertion port is provided on the inner wall of the connecting cylinder, a connecting opening is provided at the lower end of the connecting insertion port, a connecting insertion plate extends from the inner side of the opening of the rotary drive cylinder, the connecting insertion plate passes through the connecting insertion port and extends into the connecting opening, the width of the insertion port is greater than the width of the insertion plate.

[0015] Secondly, the present invention provides a composite foundation construction method, which uses the composite foundation pile-pier connection support system as described above to construct the composite foundation.

[0016] Compared with the prior art, the technical solution provided by this invention has the following advantages:

[0017] The composite foundation pile-pier connection support system of the present invention includes a spiral pile cylinder inserted into the foundation, a connecting pile cylinder at the upper end of the spiral pile cylinder, and multiple sets of connecting support arms at the upper end of the connecting pile cylinder. The connecting support arms are adjustable in position along the circumferential direction of the connecting pile cylinder and extend radially along the connecting pile cylinder. Adjustable arms are provided on the connecting support arms and are adjustable along the length direction of the connecting support arms. Adjacent connecting pile cylinders are connected as a whole by connectors provided at the cantilever ends of the adjustable arms. By adjusting the adjustable arms, the connecting support arms can be connected to each other as a whole, so that multiple sets of spiral pile cylinders can form an organic whole to provide overall support for the foundation and ensure the overall stability of the formed composite foundation. Attached Figure Description

[0018] Figure 1 It is a plan view of a single structure in a composite foundation pile-pier connection support system;

[0019] Figure 2 This is a plan view of the interconnection of two structures in a composite foundation pile-pier connection support system.

[0020] Figure 3 This is a structural diagram of the connecting pile cylinder, connecting support arm, and adjusting support arm in a composite foundation pile pier connection support system.

[0021] Figure 4 yes Figure 3 A schematic diagram of the structure from another perspective;

[0022] Figure 5 This is a structural diagram of the connection between the support arm and the adjusting arm;

[0023] Figure 6 yes Figure 5 A schematic diagram of the structure from another perspective;

[0024] Figure 7 This is a schematic diagram of the structure connecting the piles;

[0025] Figure 8 yes Figure 7 A schematic diagram of the structure from another perspective;

[0026] Figure 9 This is a schematic diagram of the installation of the spiral pile and the rotary drive cylinder;

[0027] Figure 10 This is a front view of the installation of the helical pile and the rotary drive cylinder;

[0028] Figure 11 This is a schematic diagram of the cross-sectional structure of the spiral pile cylinder;

[0029] Figure 12 This is a schematic cross-sectional view of the lower end of the spiral pile cylinder;

[0030] Figure 13 yes Figure 12 A cross-sectional view of the structure from another perspective;

[0031] Figure 14 It is a cross-sectional schematic diagram of the upper end of the helical pile cylinder cooperating with the rotating drive cylinder.

[0032] Label Explanation:

[0033] 100. Spiral pile cylinder; 110. Embedded anchor rod; 111. Grout discharge hole; 120. Trench; 121. Opening; 130. Tilting drive plate; 131. Groove opening; 140. Drive rod; 141. Drive connecting rod; 142. Linkage cylinder; 1421. Linkage socket; 1422. Linkage opening; 150. Connecting hose; 160. Main grout discharge pipe; 170. Socket; 180. Rotary drive cylinder; 181. Insertion plate; 182. Linkage insertion plate;

[0034] 200. Connecting pile cylinder; 210. Supporting turntable; 220. Supporting arc plate;

[0035] 300. Connecting support arm; 310. Adjusting track; 320. Tightening support plate; 321. Tightening nut; 322. Tightening screw; 323. Washer;

[0036] 400. Adjusting arm; 410. First adjusting roller; 411. Second adjusting roller; 420. Extension connecting arm; 421. Connecting roller;

[0037] 500. Connector; 510. Bayonet;

[0038] 610. Insert rod; 620. Insert spring. Detailed Implementation

[0039] To further understand the content of this invention, a detailed description of the invention will be provided in conjunction with the accompanying drawings and embodiments.

[0040] The structures, proportions, and sizes illustrated in the accompanying drawings are merely for illustrative purposes and to aid those skilled in the art in understanding and reading the invention. They are not intended to limit the scope of the invention and therefore have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, without affecting the effectiveness and purpose of the invention, should still fall within the scope of the technical content disclosed herein. Furthermore, terms such as "upper," "lower," "left," "right," and "middle" used in this specification are merely for clarity and not intended to limit the scope of implementation. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of the invention's implementation.

[0041] An embodiment of the present invention provides a composite foundation pile-pier connection support system, comprising a helical pile cylinder 100 inserted into the foundation, a connecting pile cylinder 200 disposed at the upper end of the helical pile cylinder 100, multiple sets of connecting support arms 300 disposed at the upper end of the connecting pile cylinder 200, the connecting support arms 300 being adjustable in position along the circumferential direction of the connecting pile cylinder 200, the connecting support arms 300 extending radially along the connecting pile cylinder 200, and an adjusting arm 400 disposed on the connecting support arm 300 being adjustable in position along the length direction of the connecting support arm 300, and adjacent connecting pile cylinders 200 being connected by a connector 500 disposed at the cantilever end of the adjusting arm 400.

[0042] In use, the helical pile cylinder 100 is rotated into the borehole of the foundation by rotating the drill bit. Multiple sets of connecting support arms 300 at the upper end of the pile cylinder 200 are then connected to other sets of helical pile cylinders 100. When connecting the upper ends of multiple sets of helical pile cylinders 100, the adjusting support arms 400 are adjusted so that the connecting support arms 300 can be interconnected, forming an organic whole to provide overall support for the foundation and ensure the overall stability of the resulting composite foundation.

[0043] During construction, the spacing of the aforementioned spiral piles 100 varies. By adjusting the adjustable support arm 400 and the connecting support arm 300, the connection requirements at the upper end of the spiral piles 100 with different spacings can be accommodated. Furthermore, the position of the connecting support arm 300 along the circumferential direction of the connecting pile 200 is adjustable. This allows for effective adjustment of the connection point between the connecting support arm 300 and the connecting pile 200, accommodating upper support connections of the spiral piles 100 in different directions and ensuring the overall connection of the upper ends of the spiral piles 100 throughout the foundation.

[0044] To further enhance the support stability of the composite foundation pile-pier connection support system for the composite foundation, the following improvements were made in this embodiment:

[0045] To implement elastic pressure relief on the upper ends of multiple sets of helical pile cylinders 100, so that the upper ends of multiple sets of helical pile cylinders 100 form a deformable whole, enabling the foundation to bear and offset forces in all directions as a whole, ensuring the integrity of the entire foundation, an elastic body is provided between the connecting support arm 300 and the adjusting support arm 400. The elastic body realizes the elastic connection between the connecting support arm 300 and the adjusting support arm 400.

[0046] Specifically, to achieve a small-angle rotational fit between the connecting support arm 300 and the connecting pile cylinder 200, thus accommodating greater foundation deformation requirements, a support turntable 210 is concentrically mounted on the outer wall of the connecting pile cylinder 200. A support arc plate 220 is rotatably mounted on the support turntable 210, with the cylinder core containing the support arc plate 220 arranged concentrically with the support turntable 210. The arc-shaped end of the support arc plate 220 is in contact with the outer wall of the connecting pile cylinder 200, and the other end of the support arc plate 220, away from the arc-shaped end, is hinged to the connecting support arm 300 with the hinge axis arranged horizontally.

[0047] The above structure allows the connecting support arm 300 to rotate at a small angle around the connecting pile cylinder 200, thus enabling the connecting support arm 300 to adapt to a wider range of angle adjustments. When minor settlement occurs in the foundation or when the connecting support arm 300 at the upper end of the aforementioned helical pile cylinder 100 is pre-installed, the above structure can be installed more conveniently, effectively providing elastic support to the upper end of the helical pile cylinder 100, making the entire foundation an elastic whole and enhancing its stability.

[0048] In this embodiment, three sets of connecting support arms 300 are distributed along the circumferential direction of the connecting pile 200. The side of the connecting support arm 300 is generally in the shape of a triangular plate, and one end is rotatably mounted on the supporting arc plate 220 via a supporting arc plate 220. An adjusting rail 310 extends from the connecting support arm 300, and the adjusting arm 400 cooperates with the adjusting rail 310.

[0049] Preferably, the cross-section of the adjusting track 310 is "T" shaped, and the adjusting support arm 400 includes a first adjusting roller 410 located on both sides of the upper plate of the adjusting track 310 and a second adjusting roller 411 located on the lower plate of the adjusting track 310. The roller cores of the first adjusting roller 410 and the second adjusting roller 411 are horizontal and arranged perpendicular to the length direction of the adjusting track 310. The roller frames of the first adjusting roller 410 and the second adjusting roller 411 are connected as one piece and an extension connecting arm 420 is provided.

[0050] The extension end of the extension connecting arm 420 is provided with a connecting roller 421. The connecting roller 421 is arranged in parallel with the first adjusting roller 410. The connector 500 has a frame-like structure. The connector 500 is provided with a bayonet 510 that forms a snap-fit ​​with the connecting roller 421.

[0051] When the adjustable sliding of the adjusting track 310 and the adjusting support arm 400 is implemented, the length between the adjusting track 310 and the adjusting support arm 400 can be adjusted by the rolling cooperation between the first adjusting roller 410 and the second adjusting roller 411 and the adjusting track 310.

[0052] Furthermore, when connecting the upper ends of multiple sets of spiral pile cylinders 100, the connector 500 uses a bayonet 510 to engage with the connecting roller 421 at the extension end of the extension link arm 420, thereby connecting the upper ends of the multiple sets of spiral pile cylinders 100. Then, an elastic body is used to elastically tighten the adjusting track 310 and the adjusting support arm 400, thus achieving an elastic connection and fixation of the upper ends of the multiple sets of spiral pile cylinders 100. This allows for greater adaptability to changes in the foundation, making the foundation a flexible whole and increasing its stability.

[0053] Specifically, when elastically tightening the adjusting track 310 and the adjusting support arm 400, the elastic body includes an insert rod 610 mounted on the first adjusting roller 410 and the second adjusting roller 411, the insert rod 610 being arranged along the length of the connecting support arm 300. A connecting spring 620 is fitted onto the insert rod 610, and the connecting spring 620 is arranged parallel to the insert rod 610. A tightening support plate 320 is provided at the cantilever end of the adjusting track 310 connecting the support arm 300, a tightening nut 321 is provided on the tightening support plate 320, a tightening screw 322 is provided inside the tightening nut 321, a washer 323 is provided at one end of the tightening screw 322 extending out of the tightening support plate 320, and the tightening screw 322 is inserted into one end of the connecting spring 620.

[0054] The elastic body includes a plug spring 620 that connects the adjusting track 310 and the adjusting arm 400. Based on the distance between the upper ends of adjacent spiral cylinders 100, the plug spring 620 is pressed by rotating the adjusting screw 322, thereby adjusting the relationship between the adjusting track 310 and the adjusting arm 400.

[0055] Adjusting the length of the plug spring 620 according to the distance between each set of adjusting rails 310 and adjusting support arm 400 can adapt to the adjustment of the cantilever length of the connecting support arm 300 at different distances, so that the upper end of the spiral pile cylinder 100 forms a stable whole, and can better adapt to the connection needs of more sets of spiral pile cylinders 100 at the upper end.

[0056] Furthermore, to ensure the stability of the bond between the helical pile cylinder 100 and the foundation soil, and to avoid instability caused by gaps in the pile cylinder 100 and the foundation soil due to settlement, in this embodiment, pre-embedded anchor rods 110 are provided on the outer wall of the helical pile cylinder 100. Multiple sets of pre-embedded anchor rods 110 are spaced apart along the circumferential and length directions of the helical pile cylinder 100, with one end of each anchor rod 110 forming a hinged connection with the helical pile cylinder 100. The pre-embedded anchor rods 110 are connected to a flipping mechanism, which drives the pre-embedded anchor rods 110 to rotate around the hinge axis and extend into the foundation soil. The pre-embedded anchor rods 110 have a tubular structure, and grout discharge holes 111 are provided on them, communicating with the grout outlet of the grouting equipment.

[0057] When introducing the helical pile 100 underground, a hole is pre-drilled in the ground, and the helical pile 100 is rotated into the hole using a drilling rig. After the helical pile 100 is introduced underground, a flipping mechanism causes the pre-embedded anchor rod 110 to rotate around the hinge axis, allowing the pre-embedded anchor rod 110 to extend into the foundation soil. Concrete grout is introduced into the pre-embedded anchor rod 110 using grouting equipment. After the concrete solidifies, an interwoven concrete network is formed between the outer wall of the helical pile 100 and the foundation soil, which further improves stability and effectively ensures the stability of the bond between the helical pile 100 and the foundation soil.

[0058] Furthermore, to reliably introduce concrete grout into the pre-embedded anchor rod 110, a connecting hose 150 is installed at the hinge axis position of the pre-embedded anchor rod 110. One end of the connecting hose 150 is connected to the pipe end of the pre-embedded anchor rod 110, and multiple sets of grout discharge holes 111 are spaced apart along the length of the pre-embedded anchor rod 110. The other end of the connecting hose 150 passes through the slot 131 and is connected to the grout discharge main pipe 160. The grout discharge main pipe 160 is arranged along the length of the spiral pile cylinder 100, and the upper end of the grout discharge main pipe 160 extends out of the spiral pile cylinder 100 and is connected to the grout outlet of the grouting equipment. When the pre-embedded anchor rod 110 is flipped and extended into the foundation soil, the grouting equipment introduces concrete grout into the grout discharge main pipe 160.

[0059] After the spiral pile 100 is screwed into the ground, concrete grout is injected into the main pipe 160 through the grouting equipment, and the concrete grout is introduced into the pre-embedded anchor rod 110 through the connecting hose 150. The concrete grout is then discharged through the grout discharge hole 111 into the gap between the pre-embedded anchor rod 110 and the foundation soil. This allows the concrete grout to enter the gaps created by the soil driven by the rotation of the pre-embedded anchor rod 110, so that a dense network of slow-setting soil is formed between the outer walls of the spiral pile 100, thereby ensuring the reliability of the bond between the spiral pile 100 and the foundation soil.

[0060] More specifically, a groove 120 is provided on the outer wall of the helical pile cylinder 100, and the groove 120 is arranged to run through the length of the helical pile cylinder 100. One end of the pre-embedded anchor rod 110 is hinged to the bottom of the groove 120, and an opening 121 is provided at the bottom of the groove 120.

[0061] The flipping mechanism in this embodiment includes a flipping drive plate 130 disposed at the hinge end of the pre-embedded anchor rod 110. One end of the flipping drive plate 130 passes through the opening 121 and extends into the cavity of the helical pile cylinder 100. The angle between the flipping drive plate 130 and the pre-embedded anchor rod 110 is an obtuse angle. The extended end of the flipping drive plate 130 is inclined towards the lower end of the helical pile cylinder 100 and is connected to the drive unit. The drive unit drives the flipping drive plate 130 to rotate.

[0062] When performing the driving operation of flipping and extending the pre-embedded anchor rod 110 into the foundation soil, the driving unit drives the flipping drive plate 130 to rotate, thereby causing the pre-embedded anchor rod 110 to rotate around the hinge axis.

[0063] When the pre-embedded anchor 110 is rotated around its axis, it changes from being located within the trench 120 to being tilted downwards, allowing it to extend into the foundation soil. The grouting equipment is then activated to inject concrete grout into the pre-embedded anchor 110. After the concrete solidifies, an interwoven concrete network is formed between the outer wall of the helical pile 100 and the foundation soil, further improving the stability of the helical pile 100's grip on the foundation soil.

[0064] Preferably, when the flipping drive plate 130 is flipped, the extended end of the flipping drive plate 130 is generally in the shape of an arc-shaped groove, and a slot 131 is provided on the surface of the arc-shaped groove of the flipping drive plate 130. The drive unit includes a drive rod 140 disposed in the arc-shaped groove of the flipping drive plate 130. The drive rod 140 is arranged horizontally and perpendicular to the helical pile cylinder 100. A drive connecting rod 141 is provided on the rod of the drive rod 140. The drive connecting rod 141 has an opening 131 and protrudes from the upper end of the helical pile cylinder 100.

[0065] The extension end of the aforementioned flip drive plate 130 is generally in the shape of an arc-shaped groove and is horizontal in the length direction. When the drive rod 140 is inserted into the arc-shaped groove of the extension end of the flip drive plate 130, the drive connecting rod 141 on the body of the drive rod 140 extends out of the groove 131.

[0066] When the drive connecting rod 141 is driven, the flipping drive plate 130 is pulled to flip the pre-embedded anchor rod 110, thereby effectively flipping the pre-embedded anchor rod 110 and allowing it to extend into the foundation soil. After the entire pre-embedded anchor rod 110 is flipped, concrete grout is injected into it using grouting equipment. This forms a solidified slow-setting soil network within the gaps of the outer wall of the spiral pile cylinder 100, effectively ensuring the tightness of the bond between the outer wall of the spiral pile cylinder 100 and the foundation soil, and ensuring the stability of the entire spiral pile cylinder 100 bonded to the foundation.

[0067] When driving the pre-embedded anchor rod 110, the outer wall of the spiral pile cylinder 100 is provided with a socket 170. The sockets 170 are arranged along the length of the spiral pile cylinder 100 and four sets are arranged along the circumferential direction of the spiral pile cylinder 100. A rotary drive cylinder 180 is provided at the upper end of the spiral pile cylinder 100, and a plug-in plate 181 is provided at the lower end of the rotary drive cylinder 180. The plug-in plate 181 and the socket 170 form a plug-in fit.

[0068] A connecting cylinder 142 is provided at one end of the aforementioned drive connecting rod 141 extending out of the helical pile cylinder 100. The connecting cylinder 142 is arranged concentrically with the helical pile cylinder 100. A connecting insertion port 1421 is provided on the inner wall of the connecting cylinder 142. Multiple sets of connecting insertion ports 1421 are arranged along the length direction of the connecting cylinder 142 and along the circumferential direction of the connecting cylinder 142. A connecting opening 1422 is provided at the lower end of the connecting insertion port 1421. The connecting opening 1422 and the connecting insertion port 1421 together form an "L" shape. A connecting insertion plate 182 extends from the opening of the rotating drive cylinder 180. The connecting insertion plate 182 is also "L" shaped. The connecting insertion plate 182 passes through the connecting insertion port 1421 and extends into the connecting opening 1422. The width of the insertion port 170 is greater than the width of the insertion plate 181.

[0069] When screwing the helical pile cylinder 100 into the borehole, the rotary drive cylinder 180 is hoisted to the upper end of the helical pile cylinder 100 using hoisting equipment, and the insertion plate 181 and the insertion port 170 are engaged. The connecting insertion plate 182 passes through the connecting insertion port 1421. By starting the drill rod, the rotary drive cylinder 180 is driven to rotate, thus screwing the helical pile cylinder 100 into place. After rotation, the drill bit is started to reverse the rotary drive cylinder 180 by about 15°, so that the "L"-shaped end of the connecting insertion plate 182 extends into the connecting opening 1422, thereby locking the rotary drive cylinder 180 and the connecting cylinder 142.

[0070] By lifting the drill rod, the connecting cylinder 142 is lifted, and the rotary drive cylinder 180 is separated from the upper end of the helical pile cylinder 100. After the connecting cylinder 142 is lifted, the pre-embedded anchor rod 110 can be rotated to extend into the soil foundation. Then, the drill rod is started to rotate the rotary drive cylinder 180 15° clockwise, thereby separating the rotary drive cylinder 180 from the connecting cylinder 142.

[0071] As the drill rod is lifted, the rotary drive cylinder 180 is removed from the upper end of the helical pile cylinder 100. After the grouting equipment injects concrete into the pre-embedded anchor rod 110 and the concrete solidifies, the connecting pile cylinder 200 is hoisted to the upper end of the helical pile cylinder 100 by the hoisting equipment, thus completing the construction of a single pile cylinder. After all the pile cylinders in the foundation are constructed, the above-mentioned connection system is connected into one unit by the equipment, which further improves the stability of the entire composite foundation.

[0072] Based on the composite foundation pile-pier connection support system, this embodiment of the invention also provides a method for constructing a composite foundation using the composite foundation pile-pier connection support system. The various structures in the system are as described above and will not be repeated here.

[0073] The present invention and its embodiments have been described above illustratively. This description is not restrictive, and the figures shown are only one embodiment of the present invention; the actual structure is not limited thereto. Therefore, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the spirit of the present invention, such designs should fall within the protection scope of the present invention.

Claims

1. A composite foundation pile-pier connection support system, characterized in that, The system includes a spiral pile tube (100) inserted into the foundation, a connecting pile tube (200) at the upper end of the spiral pile tube (100), and multiple sets of connecting support arms (300) arranged at the upper end of the connecting pile tube (200) with adjustable positions along the circumferential direction and extending along the radial direction of the connecting pile tube (200). An adjusting arm (400) is provided on the connecting support arm (300) with adjustable position along the length direction of the connecting support arm (300). Adjacent connecting pile tubes (200) are connected by a connector (500) provided at the cantilever end of the adjusting arm (400). The outer wall of the spiral pile tube (100) is hinged with several pre-embedded anchor rods (110). The pre-embedded anchor rods (110) are connected to the flipping mechanism. The flipping mechanism drives the pre-embedded anchor rods (110) to rotate around the hinge axis and extend into the soil foundation. The pre-embedded anchor rods (110) are tubular and have grout discharge holes (111) on the tube body. The pre-embedded anchor rods (110) are connected to the grouting equipment. The outer wall of the spiral pile tube (100) is provided with a groove (120) through the length direction. One end of the pre-embedded anchor rod (110) is hinged to the bottom of the groove (120). An opening (121) is provided at the bottom of the groove (120). The flipping mechanism includes a flipping drive plate (130) provided at the hinge end of the pre-embedded anchor rod (110). The flipping drive plate (130) passes through the opening (121) and extends into the spiral pile tube (100). The extended end of the flipping drive plate (130) is inclined to point to the lower end of the spiral pile tube (100) and is connected to the drive unit. The drive unit drives the flipping drive plate (130) to rotate. The extension end of the flip drive plate (130) is provided with a slot (131), and the drive unit includes a drive rod (140) that abuts against the bottom surface of the flip drive plate (130). A drive connecting rod (141) is provided on the body of the drive rod (140). The drive connecting rod (141) passes through the slot (131) and protrudes from the upper end of the spiral pile cylinder (100). It also includes a rotary drive cylinder (180), an inlet (170) is provided on the outer wall of the upper end of the spiral pile cylinder (100), and an insertion plate (181) is provided at the lower end of the rotary drive cylinder (180). The insertion plate (181) and the inlet (170) form an insertion fit. A connecting cylinder (142) is provided at one end of the drive connecting rod (141) that extends out of the spiral pile cylinder (100). A connecting inlet (1421) is provided on the inner wall of the connecting cylinder (142). A connecting opening (1422) is provided at the lower end of the connecting inlet (1421). A connecting insertion plate (182) extends from the inner side of the opening of the rotary drive cylinder (180). The connecting insertion plate (182) passes through the connecting inlet (1421) and extends into the connecting opening (1422). The width of the inlet (170) is greater than the width of the insertion plate (181).

2. The composite foundation pile-pier connection support system according to claim 1, characterized in that, The outer wall of the connecting pile tube (200) is concentrically provided with a support turntable (210), and a support arc plate (220) is rotatably provided on the support turntable (210). The core of the cylinder where the support arc plate (220) is located is concentrically arranged with the support turntable (210). The arc end of the support arc plate (220) is in contact with the outer wall of the connecting pile tube (200), and the other end away from the arc end of the support arc plate (220) is hinged to the connecting support arm (300) with the hinge axis arranged horizontally.

3. The composite foundation pile-pier connection support system according to claim 1, characterized in that, An adjustment track (310) extends from the connecting support arm (300). The adjustment support arm (400) includes a first adjustment roller (410) located on both sides of the upper plate of the adjustment track (310) and a second adjustment roller (411) located on the lower plate of the adjustment track (310). The roller cores of the first adjustment roller (410) and the second adjustment roller (411) are horizontal and perpendicular to the length direction of the adjustment track (310). The roller frames of the first adjustment roller (410) and the second adjustment roller (411) are connected as one unit.

4. The composite foundation pile-pier connection support system according to claim 3, characterized in that, The roller frame is provided with a rod (610) arranged along the length of the connecting support arm (300). A spring (620) is sleeved on the rod (610). A tensioning plate (320) is provided at the overhang end of the adjusting track (310). A tensioning nut (321) and a tensioning screw (322) are provided on the tensioning plate (320). The other end of the tensioning screw (322) is connected to the spring (620).

5. The composite foundation pile-pier connection support system according to claim 1, characterized in that, The pre-embedded anchor rod (110) is connected to the connecting hose (150) at the end of the pipe near the hinge shaft. The other end of the connecting hose (150) is connected to the grout discharge pipe (160) inside the cylinder of the spiral pile (100). The grout discharge pipe (160) extends out of the upper end of the spiral pile (100) and is connected to the grout outlet of the grouting equipment.

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