A pile stone covering system and composite foundation construction method

Abstract

The present invention discloses a foundation pile stone covering system and a composite foundation construction method, belonging to the technical field of composite foundations. The system includes a spiral pile barrel, which is screwed into a drilled hole in the foundation; stone covering rollers, which are arranged in multiple groups along the circumferential direction of the spiral pile barrel; a maintenance barrel, which is sleeved on the outer wall of the spiral pile barrel, and the stone covering rollers protrude from the lower end of the maintenance barrel; a cavity for accommodating stones is formed between the inner wall of the maintenance barrel and the outer wall of the spiral pile barrel, and the outlet of the cavity is connected to the stone covering rollers through the lower end of the maintenance barrel. Through the stone covering operation between the spiral foundation pile and the foundation soil, a uniform and effective combination is formed between the spiral foundation pile and the foundation soil, ensuring the stability of the combination between the spiral foundation pile and the foundation soil, thereby implementing overall support for the composite foundation.

Description

Technical Field

[0001] The present invention relates to the technical field of composite foundations, and more particularly to a pile stone covering system and a composite foundation construction method. Background Art

[0002] A composite foundation is an artificial foundation in which part of the soil in a natural foundation is reinforced or replaced during the foundation treatment process, or reinforcing materials are installed within the natural foundation. The reinforced area is composed of a base (natural foundation soil or improved natural foundation soil) and a reinforcement. Under load, the base and reinforcement share the load. Based on the load transfer mechanism of composite foundations, composite foundations are divided into two categories: vertical reinforcement composite foundations and horizontal reinforcement composite foundations. Vertical reinforcement composite foundations are further divided into three types: bulk pile composite foundations, flexible pile composite foundations, and rigid pile composite foundations.

[0003] During foundation reinforcement construction, for soft foundations, spiral cement piles are generally used to reinforce the foundation. Spiral cement piles of different depths are arranged in an array along the soft foundation, and the upper ends of the spiral cement piles are connected by connecting caps. Multiple sets of connecting caps are connected as a whole by connecting brackets, thereby forming a whole spiral cement pile. When the above spiral cement piles are combined with the foundation soil, due to the unevenness of the foundation soil in the depth direction, the combination of the spiral cement piles and the foundation soil is unstable. The spiral cement piles are prone to gaps and deflection. Therefore, it is necessary to improve the existing combination of the foundation piles and the foundation soil to ensure the stability of the combination of the foundation piles and the foundation. Summary of the Invention

[0004] To address these issues, this solution provides a pile-stone covering system and composite foundation construction method. This solution utilizes stone covering between the spiral piles and the foundation soil to create a uniform and effective bond, ensuring the stability of the bond and providing overall support for the composite foundation.

[0005] In order to achieve the above object, the technical solution provided by the present invention is:

[0006] In one aspect, the present invention provides a pile foundation stone covering system, comprising

[0007] A screw pile barrel, which is screwed into a drilled hole in the foundation;

[0008] Stone-covering rollers, wherein the stone-covering rollers are arranged in multiple groups along the circumferential direction of the spiral pile barrel;

[0009] A maintenance cylinder, wherein the maintenance cylinder is sleeved on the outer wall of the spiral pile cylinder, and the stone-covering roller protrudes out of the lower end of the maintenance cylinder;

[0010] A cavity for accommodating stones is formed between the inner wall of the maintenance cylinder and the outer wall of the spiral pile cylinder, and an outlet of the cavity is communicated with the stone-covering roller via the lower end opening of the maintenance cylinder.

[0011] Furthermore, the extension direction of the stone covering roller is arc-shaped and is arranged along the lower end of the maintenance cylinder. The center of the circle along the roller length of the stone covering roller is concentric with the maintenance cylinder. The maintenance cylinder moves along the length direction of the spiral pile cylinder and covers the stones.

[0012] Furthermore, the roller frame of the stone-covering roller is rotatably arranged in the cylinder cavity of the maintenance cylinder, and the rotating shaft is arranged perpendicular to the length direction of the maintenance cylinder; a driving mechanism is also provided in the cylinder cavity of the maintenance cylinder, which is used to drive the stone-covering roller to rotate around the rotating shaft and make the stone-covering roller protrude from the outer wall of the maintenance cylinder.

[0013] Furthermore, a notch is provided at the lower end of the maintenance cylinder, and the stone-covering roller protrudes from the notch out of the outer wall of the maintenance cylinder. A guide slide is provided on the roller frame of the stone-covering roller, and the stones are guided out of the notch along the guide slide.

[0014] Furthermore, the roller frame of the stone-covering roller is rotatably arranged on the connecting ring, the connecting ring is arranged concentrically with the maintenance cylinder, and a driving arm is provided at the extending end of the roller frame of the stone-covering roller. The driving mechanism includes a driving cylinder, and a cavity for accommodating stones is formed between the outer wall of the driving cylinder and the inner wall of the maintenance cylinder. The driving cylinder is arranged concentrically with the maintenance cylinder and the lower end is in contact with or separated from the driving arm.

[0015] Furthermore, the upper end of the driving cylinder and the maintenance cylinder form a vertical sliding fit, a plug-in track is provided on the inner wall of the maintenance cylinder, a plug-in plate is provided on the upper end of the driving cylinder, the plug-in track contour matches the plug-in plate contour, the driving cylinder deflects and causes the plug-in plate to form a locking fit with the plug-in track, a spring sheet is provided in the plug-in track, and the spring sheet abuts against the upper and lower ends of the plug-in plate.

[0016] Furthermore, a connecting pile barrel is arranged outside the spiral pile barrel, a supporting barrel is arranged at the upper end of the connecting pile barrel, the lower end of the supporting barrel is a conical barrel structure and the small-sized end is connected to the upper end of the connecting pile barrel; a supporting arc plate is arranged on the outer wall of the connecting pile barrel, and the circumferential position of the supporting arc plate along the outer wall of the connecting pile barrel is adjustable, the supporting arc plate is hinged to the connecting bracket, the hinge axis is horizontal and perpendicular to the length direction of the connecting pile barrel, and a connecting truss is arranged on the connecting bracket, and the length of the connecting truss is adjustable.

[0017] Furthermore, the connecting truss includes a first frame and a second frame, the first frame includes multiple groups of truss plates arranged in parallel and spaced apart, and the second frame is provided with multiple groups of sliding clips arranged in parallel and spaced apart, the truss plates and the sliding clips are arranged vertically and slidingly matched, adjacent sliding clips are connected by a cross plate, the cross plate is parallel to the truss plate, and a spring is arranged between the cross plate and the truss plate.

[0018] Furthermore, a ball is provided on the inner side wall where the supporting arc plate is combined with the connecting pile barrel, and the ball abuts against the outer wall of the connecting pile barrel, and the connecting pile barrel moves downward and drives the supporting arc plate to move outward along the radial direction of the connecting pile barrel.

[0019] In a second aspect, the present invention provides a method for constructing a composite foundation using the above-mentioned pile-stone covering system, comprising:

[0020] Clean the foundation surface, pre-drill holes with a drilling rig, and wash the holes;

[0021] The lifting equipment lifts the spiral pile barrel to the bottom of the driving drill bit, and the driving drill bit rotates the spiral pile barrel into the drill hole until it reaches the set depth; the lifting equipment lifts the maintenance barrel to the bottom of the driving drill bit, and the driving drill bit rotates the maintenance barrel onto the spiral pile barrel; the lifting equipment lifts the driving barrel to the outside of the spiral pile barrel, forming a cavity for accommodating stones between the driving barrel and the maintenance barrel;

[0022] Stones are put into the cavity, the driving cylinder is driven downward by the pressure rod, and the maintenance cylinder is reversed by the drill rod, so that the maintenance cylinder and the upper end of the driving cylinder are locked, and the stone covering roller protrudes out of the lower end of the maintenance cylinder;

[0023] Start the drill rod to move upward, so that the maintenance cylinder and the driving cylinder move upward, and the stone is guided out by the stone covering roller and adheres to the outer wall of the drill hole;

[0024] The hoisting equipment hoists the connecting pile barrel to the bottom of the driving drill bit, and the driving drill bit installs the connecting pile barrel on the spiral pile barrel. Mortar is filled between the outer wall of the connecting pile barrel and the inner wall of the drill hole until the support barrel at the upper end of the connecting pile barrel is screwed into the foundation. The support barrel drives the connecting truss to be tightened to implement the connection installation of the upper end of the connecting pile barrel.

[0025] Compared with the prior art, the technical solution provided by the present invention has the following beneficial effects:

[0026] During use, the system rotates the pile barrel into the borehole via the drill rod. A maintenance barrel and a driving barrel are then sequentially installed outside the barrel. Stone is then filled into the cavity between the inner wall of the maintenance barrel and the outer wall of the driving barrel. As the maintenance barrel and driving barrel are withdrawn, the stone is rolled out of the cavity via multiple sets of stone-covering rollers at the lower end of the pile barrel. The stone is then pressed into the borehole wall, creating a more uniform geological structure. The gap between the borehole and the pile barrel is filled with mortar, effectively ensuring the reliable bond between the pile barrel and the subsoil, and thus the stability of the entire composite foundation. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a structural diagram of the pile-covered stone system;

[0028] Figure 2 This is the main view of the pile-covered stone system;

[0029] Figure 3 It is a cross-sectional view of the pile-covered stone system;

[0030] Figure 4 It is a cross-sectional view of the upper end of the maintenance cylinder and the upper end of the driving cylinder;

[0031] Figure 5 It is a plan view of the connection between the pile barrel and the connecting truss;

[0032] Figure 6 This is the main view of the connection between the pile barrel and the connecting truss;

[0033] Figure 7 It is an assembly diagram of connecting trusses, supporting arc plates and connecting brackets;

[0034] Figure 8 yes Figure 7 Schematic diagram of another perspective of the structure;

[0035] Figure 9 yes Figure 7 Schematic diagram of the structure in plan;

[0036] Figure 10 It is a structural diagram of the first frame in the connecting truss.

[0037] Description of labels:

[0038] 100. Screw pile;

[0039] 200, stone-covering roller; 210, guide slide; 220, connecting ring; 230, driving arm; 240, driving cylinder; 241, plug

[0040] Plate; 300, maintenance cylinder; 310, notch; 320, plug-in rail;

[0041] 400, connecting pile cylinder; 410, supporting cylinder;

[0042] 510, supporting arc plate; 511, ball bearing; 520, connecting bracket;

[0043] 600, connecting truss; 610, first frame; 611, truss plate; 6111, snap-fit ​​opening; 620, second frame; 621, sliding card plate; 622, cross plate; 623, spring; 630, connecting frame. DETAILED DESCRIPTION

[0044] In order to further understand the content of the present invention, the present invention is described in detail with reference to the accompanying drawings and embodiments.

[0045] The structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification so as to facilitate understanding and reading by those familiar with this technology. They are not used to limit the conditions under which the present invention can be implemented, and therefore have no substantial technical significance. Any modification of the structure, change in the proportional relationship, or adjustment of the size should still fall within the scope of the technical content disclosed by the present invention without affecting the efficacy and purpose of the present invention. At the same time, terms such as "upper", "lower", "left", "right", and "middle" quoted in this specification are only for the convenience of description and are not used to limit the scope of implementation. Changes or adjustments in their relative relationships should also be considered as the scope of implementation of the present invention without substantially changing the technical content.

[0046] like Figure 1 As shown, a foundation pile stone covering system according to an embodiment of the present invention includes a spiral pile barrel 100, which is rotated into a borehole in the foundation; stone covering rollers 200, which are arranged in multiple groups along the circumferential direction of the spiral pile barrel 100; a maintenance barrel 300, which is sleeved on the outer wall of the spiral pile barrel 100, and the stone covering rollers 200 protrude from the lower end of the maintenance barrel 300; a cavity for accommodating stones is formed between the inner wall of the maintenance barrel 300 and the outer wall of the spiral pile barrel 100, and the outlet of the cavity is connected to the stone covering rollers 200 via the lower end of the maintenance barrel 300.

[0047] The system forms a uniform and effective bond between the spiral piles and the soil through the stone covering operation between the spiral piles and the soil, ensuring the stability of the bond between the spiral piles and the soil to implement overall support for the foundation.

[0048] During use, the screw pile barrel 100 is rotated into the borehole via the drill rod, and a maintenance barrel is installed on the screw pile barrel 100. Multiple groups of stone-covering rollers 200 are arranged along the circumference of the screw pile barrel 100. A cavity for accommodating stones is formed between the inner wall of the maintenance barrel 300 and the outer wall of the screw pile barrel 100, and the stones are filled into this cavity. As the maintenance barrel 300 is pulled out, the stones are discharged from the outlet of the cavity and, under the rolling action of the stone-covering rollers 200, are pressed into the borehole wall, making the geological structure of the borehole wall more uniform.

[0049] By filling the gap between the drill hole and the screw pile barrel 100 with mortar, the reliability of the combination of the screw pile barrel 100 and the base soil can be effectively ensured, thereby ensuring the stability of the entire foundation.

[0050] In order to improve the stability of the pile foundation stone covering system of this embodiment, this embodiment further makes the following improvements:

[0051] For Stone Roller 200:

[0052] like Figure 1-Figure 3As shown, the extension direction of the stone covering roller 200 is arc-shaped as a whole, and is arranged along the lower end of the maintenance cylinder 300. The center of the circle along the roller length of the stone covering roller 200 is concentric with the maintenance cylinder 300. The maintenance cylinder 300 moves along the length direction of the spiral pile cylinder 100 and covers the stones.

[0053] The stone-covering roller 200 is an arc-shaped roller, making its profile similar to the inner wall of the borehole. As the maintenance cylinder 300 moves, the stone is evenly pressed into the borehole wall, forming a uniform coverage of the inner wall of the borehole. Furthermore, as the screw pile barrel 100 is introduced, concrete slurry is introduced into the gap of the borehole. After solidification, a reliable grip is formed between the screw pile barrel 100 and the borehole wall, thereby ensuring the stability of the screw pile barrel 100 and the foundation, and thus the stability of the entire soft foundation.

[0054] In order to enable the stone-covering roller 200 to rotate around the axis and facilitate cooperation with the maintenance cylinder 300, the roller frame of the stone-covering roller 200 is rotatably arranged in the cylinder cavity of the maintenance cylinder 300, and the rotating shaft is arranged perpendicular to the length direction of the maintenance cylinder 300.

[0055] A driving mechanism is also provided in the cylinder cavity of the maintenance cylinder 300, which drives the stone covering roller 200 to rotate around the rotating shaft and makes the stone covering roller 200 protrude from the outer wall of the maintenance cylinder 300. As the maintenance cylinder 300 moves up, the stone covering operation on the borehole wall can be implemented.

[0056] For the drive mechanism:

[0057] In order to implement rotational support for the stone-covering roller 200, the roller frame of the stone-covering roller 200 is rotatably set on the connecting ring 220, and the connecting ring 220 is arranged concentrically with the maintenance cylinder 300. A driving arm 230 is provided at the extending end of the roller frame of the stone-covering roller 200. The driving mechanism includes a driving cylinder 240. The driving cylinder 240 is arranged concentrically with the maintenance cylinder 300 and the lower end is in contact with or separated from the driving arm 230. A cavity for accommodating stones is formed between the outer wall of the driving cylinder 240 and the inner wall of the maintenance cylinder 300.

[0058] By rotatably arranging the roller frame of the stone-covering roller 200 on the connecting ring 220 , the stone-covering roller 200 can be made to droop in the absence of external force, so as to be easily introduced into the maintenance cylinder 300 .

[0059] When the maintenance cylinder 300 is inserted into the borehole to cover the hole with rock, the downward movement of the drive cylinder 240 drives the drive arm 230, causing the rock-covering roller 200 to rotate about its axis and protrude from the outer wall of the maintenance cylinder 300. As the maintenance cylinder 300 moves upward to cover the hole with rock, the entire borehole becomes more uniform, ensuring the stability of the subsequent screw pile cylinder 100 and the foundation pit, eliminating the problem of pile deflection caused by uneven geology, and ensuring the stability of the entire composite foundation.

[0060] For maintenance cartridge 300:

[0061] In order to realize the discharge of stones, a notch 310 is provided at the lower end of the maintenance cylinder 300, and the stone-covering roller 200 protrudes from the outer wall of the maintenance cylinder 300 at the notch 310. A guide slide 210 is provided on the roller frame of the stone-covering roller 200, and the stones are discharged from the notch 310 along the guide slide 210.

[0062] In order to implement the connection between the driving cylinder 240 and the maintenance cylinder 300, so that the stone covering roller 200 can effectively abut against the stone, ensuring that the stone is evenly covered on the hole wall position of the drill hole, such as Figure 4 As shown, the upper end of the driving cylinder 240 and the maintenance cylinder 300 form a vertical sliding fit.

[0063] Specifically, the inner wall of the maintenance cylinder 300 is provided with a docking track 320, which runs along the length of the maintenance cylinder 300. A plug-in plate 241 is provided at the upper end of the drive cylinder 240, which runs along the length of the drive cylinder 240. The plug-in plate 241 is L-shaped and fits within the docking track 320, with the contour of the docking track 320 matching that of the plug-in plate 241. The drive cylinder 240 deflects, causing the plug-in plate 241 to form a locking fit with the docking track 320. A spring is provided within the docking track 320, which abuts against the upper and lower ends of the plug-in plate 241.

[0064] After the maintenance cylinder 300 is rotationally inserted into the screw pile cylinder 100, the driving cylinder 240 is guided into the maintenance cylinder 300 by means of a lifting device until the plug-in plate 241 at the upper end of the driving cylinder 240 is inserted into the plug-in rail 320, thereby achieving the connection between the driving cylinder 240 and the screw pile cylinder 100. Furthermore, the maintenance cylinder 300 is rotated by means of a drill rod, so that the plug-in plate 241 forms a locking fit with the plug-in rail 320. Furthermore, a spring plate is provided in the plug-in rail 320, so that the spring plate abuts against the upper and lower ends of the plug-in plate 241, causing the driving cylinder 240 to assume an elastically suspended locked state, thereby protruding the roller body of the stone-covering roller 200 out of the notch 310.

[0065] As the driving cylinder 240 and the maintenance cylinder 300 are pulled out from the borehole, the stone-covering roller 200 is in an elastic extrusion state with the borehole wall, which can effectively press the stone into the borehole wall position, thereby ensuring the uniformity of the borehole wall geology, ensuring the stability of the subsequent screw pile cylinder 100 and the soil foundation, and thus ensuring the reliability of the combination of the screw pile cylinder 100 and the foundation.

[0066] For connecting pile 400:

[0067] In order to realize the connection of the upper ends of multiple groups of spiral piles 100 in the foundation, Figure 5 and Figure 6 As shown, the spiral pile barrel 100 is also sleeved with a connecting pile barrel 400. The upper end of the connecting pile barrel 400 is provided with a supporting barrel 410, the lower end of the supporting barrel 410 is a tapered barrel structure and the small size end is connected to the upper end of the connecting pile barrel 400.

[0068] The outer wall of the connecting pile 400 is provided with a support arch plate 510, which is adjustable along the circumference of the outer wall of the connecting pile 400. A connecting bracket 520 is hingedly provided on the support arch plate 510. The connecting bracket 520 is hinged to the support arch plate 510 at a horizontal axis and perpendicular to the length of the connecting pile 400. A connecting truss 600 is provided on the connecting bracket 520, and the length of the connecting truss 600 is adjustable.

[0069] The connecting pile barrel 400 and the supporting barrel 410 are transitioned through a tapered barrel. When the connecting pile barrel 400 is extended into the drilled hole, until the supporting barrel 410 abuts against the supporting arc plate 510, the connecting truss 600 is clamped to achieve the connection between the upper ends of the spiral pile barrel 100, thereby ensuring the fixed connection of the spiral pile barrel 100.

[0070] Furthermore, the inner side wall where the support arc plate 510 is combined with the connecting pile 400 is provided with a ball 511, and the ball 511 abuts against the outer wall of the connecting pile 400, and the connecting pile 400 moves downward and drives the support arc plate 510 to move outward along the radial direction of the connecting pile 400.

[0071] When the connecting pile barrel 400 is screwed into the drill hole covered with rock under the action of the drill rod, it is combined with the spiral pile barrel 100 in the drill hole. As the connecting pile barrel 400 is extended, the supporting arc plate 510 moves outward along the radial direction of the connecting pile barrel 400 to compress the multiple groups of springs 623 in the connecting truss 600, thereby achieving an organic connection with the upper end of the connecting pile barrel 400.

[0072] For connecting trusses 600:

[0073] In order to adjust the length of the connecting trusses 600, Figures 5-10 As shown, the connecting truss 600 includes a first frame 610 and a second frame 620 .

[0074] Specifically, the first frame 610 includes multiple sets of parallel, spaced truss plates 611. The upper ends of the truss plates 611 are provided with snap-fit ​​openings 6111, which are spaced apart along the length of the truss plates 611. The second frame 620 includes multiple sets of parallel, spaced sliding clips 621. The truss plates 611 and the sliding clips 621 are arranged perpendicularly to form a grid-like structure.

[0075] The sliding clamps 621 slide within the engaging openings 6111, and adjacent sliding clamps 621 are connected integrally via a transverse plate 622. The transverse plate 622 is parallel to the truss plate 611 and is integrally connected to the truss plate 611 via a spring 623. A connecting frame 630 is provided on the second frame 620, which is provided with a socket. A latch is provided on the connecting bracket 520, which is vertically and slidably inserted into the socket.

[0076] The first frame 610 and the second frame 620 are in sliding cooperation. A plurality of springs 623 are provided between the second frame 620 and the first frame 610 . The springs 623 can realize the connection between the adjusted connecting trusses 600 .

[0077] When the distance between the first frame 610 and the second frame 620 is determined, the support arc plate 510 and the support tube 410 are abutted against each other, which can realize the compression of multiple groups of springs 623, and then realize the elastic connection between the upper ends of multiple groups of spiral pile tubes 100, so that the entire spiral pile tube 100 can effectively absorb the load of the spiral pile tube 100 caused by geological settlement, so that the entire composite foundation forms an organic whole, which can ensure the stability of the composite foundation.

[0078] Based on the structure of the pile-stone covering system described above, a composite foundation construction method of this embodiment includes the following specific steps:

[0079] S1. Clean the foundation surface, pre-drill holes with a drilling rig, and wash the holes;

[0080] S2. Hoist the spiral pile barrel 100 to the bottom of the driving drill bit by using a hoisting device. The driving drill bit rotates the spiral pile barrel 100 into the drill hole until the spiral pile barrel 100 rotates to the set depth. Hoist the maintenance barrel 300 to the bottom of the driving drill bit by using a hoisting device. The driving drill bit rotates the maintenance barrel 300 onto the spiral pile barrel 100. Hoist the driving barrel 240 to the outside of the spiral pile barrel 100 by using a hoisting device. A cavity for accommodating stones is formed between the driving barrel 240 and the maintenance barrel 300.

[0081] S3. Put stones into the receiving cavity between the driving cylinder 240 and the maintenance cylinder 300. The driving cylinder 240 is driven downward by the pressure rod. The maintenance cylinder 300 is reversed by the drill rod, so that the maintenance cylinder 300 and the upper end of the driving cylinder 240 are locked, and the stone covering roller 200 protrudes from the lower end of the maintenance cylinder 300.

[0082] S4, start the drill rod to move upward, so that the maintenance cylinder 300 and the driving cylinder 240 move upward, and the stone is guided out by the stone covering roller 200 and adheres to the outer wall of the drill hole;

[0083] S5. Use the lifting equipment to lift the connecting pile barrel 400 to the bottom of the driving drill bit. Drive the drill bit to install the connecting pile barrel 400 on the spiral pile barrel 100. Fill mortar between the outer wall of the connecting pile barrel 400 and the inner wall of the drill hole until the support barrel 410 at the upper end of the connecting pile barrel 400 is screwed into the foundation. The support barrel 410 drives the connecting truss 600 to be tightened to implement the connection and installation of the upper end of the connecting pile barrel 400.

[0084] The above is a schematic description of the present invention and its embodiments, which is not restrictive. The drawings show only one embodiment of the present invention, and the actual structure is not limited thereto. Therefore, if a person skilled in the art is inspired by this and, without departing from the purpose of the present invention, designs a structure and embodiment similar to this technical solution without inventiveness, they shall fall within the scope of protection of the present invention.

Claims

1. A pile foundation stone covering system, characterized in that: include: A screw pile barrel (100), wherein the screw pile barrel (100) is screwed into a borehole in the foundation; Stone-covering rollers (200), wherein the stone-covering rollers (200) are arranged in multiple groups along the circumferential direction of the spiral pile cylinder (100); A maintenance cylinder (300), wherein the maintenance cylinder (300) is sleeved on the outer wall of the spiral pile cylinder (100), and the stone-covering roller (200) protrudes out of the lower end of the maintenance cylinder (300); A cavity for accommodating stones is formed between the inner wall of the maintenance cylinder (300) and the outer wall of the screw pile cylinder (100), and the outlet of the cavity is connected to the stone-covering roller (200) via the lower end of the maintenance cylinder (300); The stone covering roller (200) extends in an arc shape and is arranged along the lower end of the maintenance cylinder (300). The center of the circle along the length of the stone covering roller (200) is concentric with the maintenance cylinder (300). The maintenance cylinder (300) moves along the length direction of the spiral pile cylinder (100) and covers the stones. The roller frame of the stone-covering roller (200) is rotatably arranged in the cylinder cavity of the maintenance cylinder (300), and the rotation axis is arranged perpendicular to the length direction of the maintenance cylinder (300); a driving mechanism is also arranged in the cylinder cavity of the maintenance cylinder (300) for driving the stone-covering roller (200) to rotate around the rotation axis and make the stone-covering roller (200) protrude from the outer wall of the maintenance cylinder (300); A notch (310) is provided at the lower end of the maintenance cylinder (300), and the stone covering roller (200) protrudes from the notch (310) to the outer wall of the maintenance cylinder (300). A guide slide (210) is provided on the roller frame of the stone covering roller (200), and stones are guided out of the notch (310) along the guide slide (210); The roller frame of the stone-covering roller (200) is rotatably arranged on the connecting ring (220), the connecting ring (220) and the maintenance cylinder (300) are arranged concentrically, a driving arm (230) is provided at the extending end of the roller frame of the stone-covering roller (200), the driving mechanism includes a driving cylinder (240), a cavity for accommodating stones is formed between the outer wall of the driving cylinder (240) and the inner wall of the maintenance cylinder (300), the driving cylinder (240) and the maintenance cylinder (300) are arranged concentrically, and the lower end of the driving cylinder (240) abuts against or separates from the driving arm (230); The upper end of the driving cylinder (240) and the maintenance cylinder (300) form a sliding fit in the vertical direction, the inner wall of the maintenance cylinder (300) is provided with a plug-in track (320), the upper end of the driving cylinder (240) is provided with a plug-in board (241), the outline of the plug-in track (320) is consistent with the outline of the plug-in board (241), the driving cylinder (240) deflects and causes the plug-in board (241) to form a locking fit with the plug-in track (320), a spring sheet is provided in the plug-in track (320), and the spring sheet abuts against the upper and lower ends of the plug-in board (241); The spiral pile cylinder (100) is provided with a connecting pile cylinder (400) on its outer surface. A supporting cylinder (410) is provided on the upper end of the connecting pile cylinder (400). The lower end of the supporting cylinder (410) is a tapered cylinder structure, and the small-sized end is connected to the upper end of the connecting pile cylinder (400). A supporting arc plate (510) is provided on the outer wall of the connecting pile cylinder (400). The circumferential position of the supporting arc plate (510) along the outer wall of the connecting pile cylinder (400) is adjustable. The supporting arc plate (510) is hinged to a connecting bracket (520). The hinge axis is horizontal and perpendicular to the length direction of the connecting pile cylinder (400). A connecting truss (600) is provided on the connecting bracket (520). The length of the connecting truss (600) is adjustable.

2. A pile foundation stone covering system according to claim 1, characterized in that: The connecting truss (600) includes a first frame (610) and a second frame (620). The first frame (610) includes a plurality of truss plates (611) arranged in parallel and spaced apart. The second frame (620) is provided with a plurality of sliding cards (621) arranged in parallel and spaced apart. The truss plates (611) and the sliding cards (621) are arranged vertically and slidably. Adjacent sliding cards (621) are connected by a transverse plate (622). The transverse plate (622) is parallel to the truss plate (611). A spring (623) is provided between the transverse plate (622) and the truss plate (611).

3. A pile foundation stone covering system according to claim 1 or 2, characterized in that: A ball (511) is provided on the inner side wall where the supporting arc plate (510) is combined with the connecting pile barrel (400). The ball (511) abuts against the outer wall of the connecting pile barrel (400). The connecting pile barrel (400) moves downward and drives the supporting arc plate (510) to move outward in the radial direction of the connecting pile barrel (400).

4. A method for constructing a composite foundation using the pile-stone covering system according to any one of claims 1 to 3, characterized in that: include: Clean the foundation surface, pre-drill holes with a drilling rig, and wash the holes; The hoisting device hoists the spiral pile barrel (100) below the driving drill bit, and the driving drill bit rotates the spiral pile barrel (100) into the drill hole until it reaches a set depth; the hoisting device hoists the maintenance barrel (300) below the driving drill bit, and the driving drill bit rotates the maintenance barrel (300) onto the spiral pile barrel (100); the hoisting device hoists the driving barrel (240) outside the spiral pile barrel (100), and a cavity for accommodating stones is formed between the driving barrel (240) and the maintenance barrel (300); Stones are put into the cavity, the driving cylinder (240) is driven downward by the pressure rod, and the maintenance cylinder (300) is reversed by the drill rod, so that the maintenance cylinder (300) and the upper end of the driving cylinder (240) are locked, and the stone covering roller (200) protrudes out of the lower end of the maintenance cylinder (300); The drill rod is started to move upward, so that the maintenance cylinder (300) and the driving cylinder (240) move upward, and the stone is guided out through the stone covering roller (200) and adheres to the outer wall of the drill hole; The hoisting equipment hoists the connecting pile barrel (400) to the bottom of the driving drill bit, and the driving drill bit installs the connecting pile barrel (400) on the spiral pile barrel (100), and fills mortar between the outer wall of the connecting pile barrel (400) and the inner wall of the drill hole until the support barrel (410) at the upper end of the connecting pile barrel (400) is screwed into the foundation, and the support barrel (410) is linked to the connecting truss (600) to be pressed, so as to implement the connection installation of the upper end of the connecting pile barrel (400).

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