Composite foundation pile support structure and composite foundation construction method

Abstract

This invention discloses a composite foundation pile support structure and a composite foundation construction method, belonging to the field of composite foundation technology. It includes a lower pile cylinder and a driving mechanism. An anchor rod is hinged to the outer wall of the lower pile cylinder. The driving mechanism drives the anchor rod to rotate around the hinge axis and extend into the foundation soil. The other end of the anchor rod is connected to a grouting mechanism. The driving mechanism includes a connecting piece mounted on the anchor rod, which engages with a driving locking block. The other end of the driving locking block is hinged to one end of a driving arm, and the other end of the driving arm is hinged to a driving slider. The hinge axes at both ends of the driving arm are arranged parallel to the hinge axes of the anchor rod. The driving slider slides along a strip-shaped groove on the outer wall of the lower pile cylinder. The sliding of the driving slider causes the driving arm to extend, which in turn causes the driving locking block to rotate, thereby causing the anchor rod to rotate and extend into the foundation soil. The grouting mechanism injects concrete slurry into the gap between the anchor rod and the foundation soil, forming an interactive concrete network within the soil layer on the outer wall of the lower pile cylinder, increasing soil strength.

Description

Technical Field

[0001] This invention relates to the field of composite foundation technology, and more specifically, to a composite foundation pile support structure 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 boreholes of different depths are pre-drilled on the foundation surface using drilling equipment. Then, the screw piles are drilled into the pre-drilled holes using drill rods, thereby enabling the screw piles to support the foundation. In actual foundation support, as the drilling depth of the screw piles increases, the prestress generated by foundation settlement acts on the screw piles. Multiple sets of screw piles of different heights can effectively neutralize the prestress in different directions of the foundation, thus making the foundation more stable and avoiding problems such as tilting of buildings on the foundation caused by foundation settlement.

[0004] However, after the drill rod drives the screw pile into the foundation, a certain gap exists between the foundation soil and the screw pile. This gap becomes increasingly pronounced with the use of the composite foundation. The presence of this gap easily reduces the bonding effect between the screw pile and the foundation soil, leading to uneven lateral forces on the bonded soil layer. This reduces the prestressing effect of the foundation soil and affects the overall stability of the composite foundation. Summary of the Invention

[0005] To address the aforementioned issues, this solution provides a composite foundation pile support structure and a composite foundation construction method. This solution enhances the bond between the piles and the foundation soil, improving the reliability of the pile-soil connection and ensuring the overall stability of the composite foundation.

[0006] To achieve the above objectives, the technical solution provided by the present invention is as follows:

[0007] The present invention provides a composite foundation pile support structure, comprising a lower pile cylinder and a driving mechanism, wherein an anchor rod is hinged to the outer wall of the lower pile cylinder, the driving mechanism drives the anchor rod to rotate around the hinge axis and extend into the foundation soil, and the other end of the anchor rod is connected to a grouting mechanism;

[0008] The driving mechanism includes a connecting piece disposed on the anchor rod, the connecting piece engaging with a driving locking block, the other end of the driving locking block being hinged to one end of the driving arm, the other end of the driving arm being hinged to a driving slider, the hinge shafts at both ends of the driving arm being arranged parallel to the hinge shafts of the anchor rod, and the driving slider sliding along the strip groove on the outer wall of the lower pile cylinder.

[0009] Furthermore, a drive cylinder is provided at the upper end of the lower pile cylinder, and the drive cylinder is inserted into the lower pile cylinder; the upper end of the drive slider extends out of the top slot of the strip groove and is provided with a reset spring, the two ends of the reset spring are respectively connected to one end of the strip groove and one end of the drive slider, and the lower end of the drive cylinder abuts against the drive slider.

[0010] Furthermore, a telescopic anchor rod is sleeved on the anchor rod, and the connecting piece of the drive mechanism is located at one end of the telescopic anchor rod near the hinge shaft of the anchor rod.

[0011] Furthermore, the upper end of the lower pile cylinder has a threaded connecting pipe, and the inner wall of the drive cylinder and the outer wall of the threaded connecting pipe are locked together by threads.

[0012] Furthermore, it includes a rotary drive cylinder, with several drive claws arranged at the cylinder opening, and several insertion openings arranged on the outer wall of the upper end of the threaded connecting pipe, with the drive claws extending into the insertion openings respectively.

[0013] Furthermore, a grouting hole is provided at the free end of the anchor rod, and an arc-shaped interface pipe is connected to the end of the anchor rod away from the free end. The arc-shaped interface pipe communicates with the grouting hole. An insertion hole is provided at the bottom of the strip-shaped groove, and the arc-shaped interface pipe passes through the insertion hole and forms a sliding fit. The grouting hole is connected to the grouting mechanism through the arc-shaped interface pipe.

[0014] Furthermore, the outer wall of the lower pile cylinder is provided with pipe holes, and the grouting mechanism includes several grouting pipes, which are respectively connected to the pipe holes and the arc-shaped interface pipe; the grouting pipes are connected to the grouting main pipe, which is arranged along the length of the drive cylinder and extends out of the upper end of the drive cylinder.

[0015] Furthermore, it includes several strip-shaped grooves arranged along the length of the lower pile tube and located on the inner wall of the lower pile tube. A sealing strip plate is slidably installed in the strip-shaped groove. The grouting pipe is connected to a telescopic grouting pipe. A return spring is sleeved on the outer wall of the telescopic grouting pipe. The two ends of the return spring abut against the pipe body and the pipe opening of the telescopic grouting pipe, respectively. The pipe opening of the telescopic grouting pipe abuts against the surface of the sealing strip plate.

[0016] Furthermore, a stop bar is provided below the anchor bolt hinge shaft, and the stop bar is arranged along the width direction of the strip groove cavity.

[0017] On the other hand, the present invention provides a method for constructing a composite foundation, which uses the above-mentioned composite foundation pile support structure to construct the composite foundation, including:

[0018] Prepare the foundation surface and pre-drill holes in the foundation using drilling equipment;

[0019] A guide roller and drilling rig are installed above the borehole. The lower pile casing is hoisted into the guide roller using hoisting equipment. The verticality of the lower pile casing is adjusted using the guide roller. The rotary drive cylinder is then hoisted to the upper position of the lower pile casing and installed. The drill bit of the drilling rig is connected to the rotary drive cylinder. The drilling rig is started, which drives the rotary drive cylinder to rotate, thereby rotating the lower pile casing into the borehole until the set depth is reached. The rotary drive cylinder is then hoisted up using hoisting equipment, separating it from the upper end of the lower pile casing.

[0020] The drive cylinder is hoisted into the guide pipe machine using hoisting equipment. The guide pipe machine is then used to adjust the drive cylinder and the lower pile cylinder to be concentric, and to align the drill bit of the drilling rig with the center of the drive cylinder. The drive cylinder is then rotated so that it is installed at the upper end of the lower pile cylinder. The anchor rod is then positioned at an angle to the lower pile cylinder, with its end pointing obliquely downwards towards the lower end of the pile cylinder. This causes the telescopic anchor rod on the anchor rod to extend out of the anchor rod and be inserted into the foundation soil.

[0021] The sealing strip is hoisted out of the lower pile tube using hoisting equipment. The pipe opening of the telescopic grouting pipe extends out of the pipe hole. The grouting mechanism is started to introduce concrete slurry into the grouting main pipe, so that the concrete slurry is introduced into the gap between the outer wall of the anchor rod and the outer wall of the lower pile tube until the concrete solidifies. Then the grouting is stopped.

[0022] Following the above steps, composite foundation piles of different diameters and depths are introduced into the borehole. The upper end of the composite foundation piles is sealed, a steel cage is hoisted into the composite foundation pile, and concrete is poured in to form a solid concrete pile. Then, the subsequent foundation support construction above the mattress layer is carried out, and finally the composite foundation is formed.

[0023] Compared with the prior art, the technical solution provided by this invention has the following advantages:

[0024] In the composite foundation pile support structure of this invention, during foundation treatment, a hoisting mechanism and a drilling rig are used to rotate the lower pile cylinder, causing it to rotate vertically into the foundation soil. A drive mechanism then rotates the anchor rod around its hinge axis, allowing it to extend into the foundation soil and ensure a tight bond between the lower pile cylinder and the foundation soil, thus achieving anchoring of the lower pile cylinder. Subsequently, a grouting mechanism injects concrete into the gap between the outer wall of the lower pile cylinder and the foundation soil, further ensuring the reliability of the bond between the lower pile cylinder and the foundation soil. This creates an interactive concrete network within the soil layer on the outer wall of the lower pile cylinder, increasing soil strength. By setting a rigid lower pile cylinder and an interwoven distribution of concrete, the lateral load on the soil above the soft soil layer can be balanced, making the soil less prone to lateral displacement. That is, after bearing load, the pile body is mainly subjected to vertical forces, resulting in a stable foundation structure. Attached Figure Description

[0025] Figure 1 This is the front view of the lower pile cylinder in a composite foundation pile support structure;

[0026] Figure 2 This is a front view of the cooperation between the lower pile cylinder and the rotary drive cylinder in a composite foundation pile support structure;

[0027] Figure 3 This is a front view of the overall structure of the composite foundation pile support structure;

[0028] Figure 4 and Figure 5 These are schematic diagrams of the overall structure of the composite foundation pile support structure from two different perspectives.

[0029] Figure 6 This is a schematic diagram of the lower pile cylinder in a composite foundation pile support structure;

[0030] Figure 7 This is a schematic diagram of the structure of the lower pile cylinder and the rotary drive cylinder in the composite foundation pile support structure;

[0031] Figure 8 This is a schematic diagram of the cross-sectional structure of the lower pile cylinder in a composite foundation pile support structure;

[0032] Figure 9 This is a schematic diagram of the cross-sectional structure of the lower pile cylinder after the sealing strip is removed in the composite foundation pile support structure;

[0033] Figure 10 This is the front view of the drive cylinder;

[0034] Figure 11 and Figure 12 These are schematic diagrams of the cross-sectional structure of the lower pile tube section from two different perspectives.

[0035] Figure 13 yes Figure 11A plan view of the structure;

[0036] Figure 14 and Figure 15 These are schematic diagrams of the grouting mechanism from two different perspectives.

[0037] Figure 16 This is a plan view of the grouting mechanism.

[0038] Label Explanation:

[0039] 100. Lower pile cylinder; 110. Spiral blade; 120. Strip groove; 1201. Insertion hole; 130. Threaded connecting pipe; 131. Insertion opening; 132. Tapered pipe; 140. Rotary drive cylinder; 141. Drive claw; 142. Attachment socket; 150. Pipe hole; 160. Strip groove; 170. Sealing strip;

[0040] 200, Anchor bolt; 210, Grouting hole; 220, Telescopic anchor bolt; 221, Connecting piece; 222, Drive locking block; 223, Drive arm; 224, Drive slider; 2242, Conical inclined plane; 225, Stop bar; 230, Arc-shaped interface pipe;

[0041] 300. Drive cylinder; 310. Trumpet mouth;

[0042] 410. Grouting pipe; 420. Grouting main pipe; 430. Telescopic grouting pipe; 431. Return spring. Detailed Implementation

[0043] 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.

[0044] 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.

[0045] like Figures 1-5As shown, this embodiment of a composite foundation pile support structure includes a lower pile cylinder 100 and a driving mechanism. A spiral blade 110 is provided on the outer wall of the lower pile cylinder 100, extending along the length of the lower pile cylinder 100. Anchor rods 200 are provided on the outer wall of the lower pile cylinder 100, forming a hinged connection. The anchor rods 200 are connected to the driving mechanism, which drives the anchor rods 200 to rotate around the hinge axis and extend into the foundation soil. The other end of the anchor rod 200 is connected to a grouting mechanism, which injects concrete grout into the gap between the outer wall of the lower pile cylinder 100 and the foundation soil.

[0046] When treating the foundation, the lower pile cylinder 100 is vertically rotated into the foundation ground by a hoisting mechanism and a drilling rig. After the lower pile cylinder 100 is rotated into the foundation ground, the anchor rod 200 is rotated around the hinge axis by a driving mechanism, and the anchor rod 200 is extended into the foundation soil, thereby achieving further anchoring of the lower pile cylinder 100 and ensuring the tightness of the bond between the entire lower pile cylinder 100 and the foundation soil.

[0047] The aforementioned grouting mechanism is activated after the entire anchor rod 200 has penetrated into the foundation soil. Once the anchor rod 200 is in the foundation soil, a large number of voids exist between the outer wall of the lower pile cylinder 100 and the foundation soil. Concrete is injected into these voids through the grouting mechanism to ensure reliable bonding between the lower pile cylinder 100 and the foundation soil. This creates an interactive concrete network within the soil layer on the outer wall of the lower pile cylinder 100, increasing soil strength. By setting up a rigid lower pile cylinder 100 and an interwoven distribution of concrete, the lateral load on the soil above the soft soil layer can be balanced, making the soil less prone to lateral displacement. Consequently, after bearing load, the pile body is mainly subjected to vertical forces, resulting in a stable foundation structure.

[0048] Among them, such as Figure 11-13 As shown, the driving mechanism includes a connecting piece 221 disposed on the anchor rod 200. The connecting piece 221 is engaged with the driving locking block 222. The other end of the driving locking block 222 is hinged to one end of the driving arm 223. The other end of the driving arm 223 is hinged to the driving slider 224. The hinge axes at both ends of the driving arm 223 are arranged parallel to the hinge axes of the anchor rod 200. The driving slider 224 slides along the strip groove 120 on the outer wall of the lower pile cylinder 100.

[0049] In use, the drive slider 224 slides along the length of the strip groove 120, which in turn causes the drive arm 223 to extend. The extension of the drive arm 223 drives the drive locking block 222 to rotate around the axis. As the drive locking block 222 rotates, the anchor rod 200 can be driven to rotate around the axis and extend out of the strip groove 120, thereby forming multiple holes on the outer wall of the lower pile cylinder 100.

[0050] Preferably, a telescopic anchor 220 is sleeved on the anchor 200, and the connecting piece 221 of the drive mechanism is located at the end of the telescopic anchor 220 near the hinge shaft of the anchor 200. As the drive slider 224 slides further, the drive arm 223 drives the telescopic anchor 220 to slide along the anchor 200, thereby causing the telescopic anchor 220 to penetrate into the soil layer and introduce concrete grout into the anchor 200. This allows an anchor body to be formed within the anchor 200 and the telescopic anchor 220, further improving the reliability of the bond between the anchor 200 and the soil layer.

[0051] When arranging the anchor bolts 200, in this embodiment, the strip-shaped groove 120 is arranged along the length of the lower pile cylinder 100. One end of the anchor bolt 200 is hinged to the bottom of the groove 120. Multiple sets of anchor bolts 200 are spaced apart along the length of the groove 120 and are in two states: First, the anchor bolts 200 are arranged parallel to the length of the lower pile cylinder 100 and their ends point towards the upper opening of the lower pile cylinder 100, with the bolt body lower than the opening of the groove 120. Second, the anchor bolts 200 are arranged at an angle to the lower pile cylinder 100 and their ends point obliquely towards the lower opening of the lower pile cylinder 100.

[0052] The groove 120 provides clearance for the installation of the anchor bolt 200. When the lower pile cylinder 100 is drilled into the borehole, the anchor bolt 200 is located within the groove 120, which does not affect the normal drilling of the lower pile cylinder 100. After the lower pile cylinder 100 is drilled into the borehole, under the action of the drive mechanism, the anchor bolt 200 is arranged at an angle to the lower pile cylinder 100, with its end pointing obliquely towards the lower end opening of the lower pile cylinder 100, thus achieving bonding between the anchor bolt 200 and the soil.

[0053] In this embodiment, a drive cylinder 300 is provided at the upper end of the lower pile cylinder 100. The drive cylinder 300 is inserted into the lower pile cylinder 100. When the drive cylinder 300 moves downward, it causes the anchor rod 200 to rotate around the hinge axis and extend into the foundation soil. The upper end of the drive slider 224 extends out of the top slot of the strip groove 120 and is provided with a reset spring. The two ends of the reset spring are respectively connected to one end of the strip groove 120 and one end of the drive slider 224. The lower end of the drive cylinder 300 abuts against the drive slider 224.

[0054] In use, the lower pile cylinder 100 is driven by a drilling rig, which extends into the borehole below the ground. The drilling rig also drives the drive cylinder 300 to drill, so that the drive cylinder 300 engages with the upper end of the lower pile cylinder 100. The lower end of the drive cylinder 300 abuts against the protruding end of the drive slider 224, causing the drive slider 224 to slide along the strip groove 120, thereby compressing the reset spring to drive the flipping of the anchor bolt 200 and the telescopic anchor bolt 220.

[0055] Specifically, such as Figures 6-9As shown, one end of the driving slider 224 is provided with a tapered inclined surface 2242, and the upper end of the lower pile cylinder 100 is provided with a threaded connecting pipe 130. The outer diameter of the threaded connecting pipe 130 is smaller than the outer diameter of the lower pile cylinder 100. The threaded connecting pipe 130 and the upper end of the lower pile cylinder 100 are connected as one unit through the tapered pipe 132. The tapered inclined surface 2242 and the outer wall of the tapered pipe 132 have the same inclination. The inner wall of the driving cylinder 300 and the outer wall of the threaded connecting pipe 130 form a threaded connection fit. The lower end of the driving cylinder 300 is provided with a flared mouth 310. The flared mouth 310 and the tapered inclined surface 2242 form abutting fit.

[0056] When implementing the drive of slider 224, such as Figure 10 As shown, the lower end of the drive cylinder 300 first forms a threaded connection with the threaded connecting pipe 130. The drive cylinder 300 is rotated by the drilling rig, which in turn causes the flared mouth 310 at the lower end of the drive cylinder 300 to abut against the conical inclined surface 2242 at the upper end of the drive slider 224, so that the drive slider 224 slides along the strip groove 120, thereby moving the anchor rod 200 to rotate it, and then extending it into the soil layer.

[0057] In this embodiment, a insertion opening 131 is provided on the outer wall of one end of the threaded connecting pipe 130. The insertion opening 131 extends along the length of the threaded connecting pipe 130, and multiple sets of insertion openings are provided in the circumferential direction of the threaded connecting pipe 130. A rotary drive cylinder 140 is provided at the pipe opening of the threaded connecting pipe 130. Multiple sets of drive claws 141 are provided at the cylinder opening of the rotary drive cylinder 140, and the multiple sets of drive claws 141 extend into the insertion opening 131 respectively. A mating socket 142 is provided at the cylinder opening of the other end of the rotary drive cylinder 140 to form an insertion fit with the drill bit.

[0058] In use, the lower pile cylinder 100 is hoisted to a position above the borehole using hoisting equipment. Then, the rotary drive cylinder 140 is hoisted to the upper end of the lower pile cylinder 100 using the same equipment, so that the multiple sets of drive claws 141 on the rotary drive cylinder 140 extend into the insertion opening 131. The drill rod of the drilling rig is started, so that the end of the drill rod is inserted into the coupling insertion port 142, causing the rotary drive cylinder 140 to rotate, thereby rotating the lower pile cylinder 100.

[0059] After the lower pile cylinder 100 is rotated into position, the rotating drive cylinder 140 is pulled out by the hoisting equipment, and then the drive cylinder 300 is hoisted to the upper position of the lower pile cylinder 100 by the hoisting equipment, so that the drill rod and the drive cylinder 300 are combined, and the drive cylinder 300 is rotated to the lower pile cylinder 100 to implement the unfolding of the anchor rod 200 and the sliding drive of the sliding anchor rod 220, so that the anchor rod 200 extends into the soil foundation of the outer wall of the lower pile cylinder 100.

[0060] After the drive cylinder 300 is installed, concrete grout is filled into the gap between the anchor hole 210 of the anchor rod 200 and the outer wall of the lower pile cylinder 100. This fills the gap in the outer wall of the lower pile cylinder 100, forming an interwoven concrete network on the outer wall of the lower pile cylinder 100, thereby ensuring the stability of the entire pile bond with the foundation soil.

[0061] In this embodiment, a grouting hole 210 is provided at the free end of the anchor rod 200, and the grouting hole 210 is connected to the grouting mechanism. The end of the anchor rod 200 away from the free end is connected to an arc-shaped interface pipe 230, which is connected to the grouting hole 210. An insertion hole 1201 is provided at the bottom of the strip-shaped groove 120, and the arc-shaped interface pipe 230 passes through the insertion hole 1201 and forms a sliding fit. The grouting hole 210 is connected to the grouting mechanism through the arc-shaped interface pipe 230.

[0062] After the drive mechanism drives the anchor rod 200 to extend into the soil, concrete slurry is discharged into the grouting hole 210 through the grouting mechanism. The concrete slurry forms a dense anchor body around the anchor rod 200. As the concrete completely solidifies, intersecting concrete anchoring layers are formed on the outer wall of the lower pile cylinder 100, thereby forming a reliable bonding layer between the lower pile cylinder 100 and the soil layer, ensuring the constraint of the lower pile cylinder 100 on the soil layer and preventing soil subsidence.

[0063] Specifically, when filling the intersecting pores on the outer wall of the lower pile 100 and the soil voids of the anchor rod 200 with slow-setting grout, an arc-shaped interface pipe 230 is provided at one end of the anchor rod 200, and the bottom of the groove 120 is provided with an insertion hole 1201 that connects to the inner cavity of the drive cylinder 300. When the anchor rod 200 rotates around the hinge axis, the arc-shaped interface pipe 230 slides along the insertion hole 1201, and the arc-shaped interface pipe 230 is connected to the grouting hole 210.

[0064] Furthermore, pipe holes 150 are provided on the outer wall of the lower pile cylinder 100, and multiple sets of pipe holes 150 are spaced apart along the circumferential and length directions of the lower pile cylinder 100. For example... Figures 14-16 As shown, the grouting mechanism includes multiple sets of grouting pipes 410. The multiple sets of grouting pipes 410 are respectively connected to the pipe hole 150 and the arc-shaped interface pipe 230. The multiple sets of grouting pipes 410 are connected to the grouting main pipe 420. The grouting main pipe 420 is arranged along the length of the drive cylinder 300 and extends out of the upper end of the drive cylinder 300.

[0065] When the drive cylinder 300 is screwed to the upper end of the lower pile cylinder 100, thereby flipping the anchor rod 200, the arc-shaped interface pipe 230 extends into the insertion hole 1201, thus connecting the grouting hole 210 at the end of the anchor rod 200 with the grouting pipe 410. Concrete slurry is guided to the grouting main pipe 420 via grouting equipment, and then led out through multiple sets of grouting pipes 410 to the arc-shaped interface pipe 230. The arc-shaped interface pipe 230 is then led out to the grouting hole 210, thereby filling the gap between the anchor rod 200 and the foundation soil with concrete.

[0066] Simultaneously, the concrete slurry is led out through the grouting pipe 410 to the pipe hole 150, thereby filling the gap in the outer wall of the lower pile cylinder 100 and forming an interwoven slow-setting soil network on the outer wall of the lower pile cylinder 100, thus ensuring the reliability of the bond between the lower pile cylinder 100 and the foundation base.

[0067] To prevent soil from entering the lower pile cylinder 100 through the pipe hole 150, a strip groove 160 is provided on the inner wall of the lower pile cylinder 100 in this embodiment. The strip groove 160 is arranged through the length of the lower pile cylinder 100 and multiple sets are arranged along the circumferential direction of the inner wall of the lower pile cylinder 100. A sealing strip 170 is slidably installed in the strip groove 160, and the upper end of the sealing strip 170 is fixed as one piece.

[0068] In addition, a telescopic grouting pipe 430 is slidably installed at the pipe opening of the grouting pipe 410. A return spring 431 is sleeved on the outer wall of the telescopic grouting pipe 430. The two ends of the return spring 431 abut against the pipe body of the telescopic grouting pipe 430 and the pipe opening of the grouting pipe 410, respectively. The pipe opening of the telescopic grouting pipe 430 abuts against the plate surface of the sealing strip 170.

[0069] In use, as the lower pile cylinder 100 is screwed in, the sealing strip 170 is used to seal the pipe hole 150. After the lower pile cylinder 100 is screwed in, the sealing strip 170 is hoisted out from the upper end of the lower pile cylinder 100 using hoisting equipment. Then, under the action of the return spring 431, the pipe opening of the telescopic grouting pipe 430 passes through the pipe hole 150 and extends out.

[0070] High-pressure concrete slurry is introduced into the grouting main pipe 420 by concrete grouting equipment and then discharged from the pipe hole 150, so that the soil pores of the lower pile cylinder 100 are filled with dense slow-setting soil, thereby forming an interwoven concrete layer on the outer wall of the lower pile cylinder 100. After the slow-setting soil dries, it can effectively ensure the reliability of the bond between the lower pile cylinder 100 and the outer wall of the base layer.

[0071] To limit the movement of the anchor rod 200 after it is flipped, a stop bar 225 is provided in the width direction of the groove of the strip groove 120. When the anchor rod 200 and the lower pile cylinder 100 are arranged at an angle, the rod body of the anchor rod 200 abuts against the stop bar 225.

[0072] This embodiment also provides a composite foundation construction method, which uses the above-mentioned composite foundation pile support structure to construct the composite foundation, specifically including the following steps:

[0073] Prepare the foundation surface, and use drilling equipment to pre-drill holes in the foundation. The hole diameter is determined according to the diameter of the composite foundation piles, so that the hole is smaller than the diameter of the composite foundation piles, and the hole depth varies.

[0074] A guide pipe machine and a drilling rig are installed above the borehole. The lower pile cylinder 100 of the unit is hoisted into the guide pipe machine using hoisting equipment. The verticality of the lower pile cylinder 100 is adjusted by the guide pipe machine to keep the lower pile cylinder 100 vertical. The rotary drive cylinder 140 is then hoisted to the upper position of the lower pile cylinder 100 and installed using hoisting equipment.

[0075] The drill bit of the drilling rig is combined with the rotary drive cylinder 140. When the drilling rig is started, the rotary drive cylinder 140 is rotated to rotate the lower pile cylinder 100 so that the lower pile cylinder 100 rotates into the borehole until it is drilled to the set depth.

[0076] The rotary drive cylinder 140 is hoisted up using hoisting equipment, thereby separating the rotary drive cylinder 140 from the upper end of the lower pile cylinder 100.

[0077] The drive cylinder 300 is hoisted into the guide pipe machine using hoisting equipment. The guide pipe machine is used to adjust the drive cylinder 300 and the lower pile cylinder 100 to be concentric, and to make the drill bit of the drilling rig align with the center of the drive cylinder 300. The drive cylinder 300 is then rotated so that it is installed at the upper end of the lower pile cylinder 100. The anchor rod 200 is then moved to be arranged at an angle to the lower pile cylinder 100, with its end pointing obliquely towards the lower end of the lower pile cylinder 100. This causes the telescopic anchor rod 220 on the anchor rod 200 to extend out of the anchor rod 200 and be inserted into the foundation soil.

[0078] The sealing strip 170 is hoisted out of the lower pile cylinder 100 using hoisting equipment, and the grout outlet of the grouting machine is connected to the grouting main pipe 420. After the sealing strip 170 is hoisted out of the lower pile cylinder 100, the pipe opening of the telescopic grouting pipe 430 extends out of the pipe hole 150. At the same time, a portion of the telescopic grouting pipe 430 is connected to the arc-shaped interface pipe 230, and the grouting machine is started to introduce concrete grout into the grouting main pipe 420, so that the concrete grout is introduced into the gap between the outer wall of the anchor rod 200 and the outer wall of the lower pile cylinder 100 until the concrete solidifies, and then the grouting is stopped.

[0079] Following the steps described above, composite foundation piles of different diameters and depths are inserted into the ground.

[0080] Then, the upper end of the composite foundation pile is sealed, a steel cage is hoisted into the composite foundation pile, and concrete is poured in to make the composite foundation pile a solid concrete pile. Then, the subsequent foundation support above the mattress layer is constructed, and finally the composite foundation is formed.

[0081] 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 ground pile support construction comprising a lower pile casing (100) and a driving mechanism, characterized in that, The lower pile tube (100) is hinged to the outer wall of the anchor rod (200), and the driving mechanism drives the anchor rod (200) to rotate around the hinge axis and extend into the foundation soil. The other end of the anchor rod (200) is connected to the grouting mechanism. The driving mechanism includes a connecting piece (221) disposed on the anchor rod (200), the connecting piece (221) being engaged with the driving locking block (222), the other end of the driving locking block (222) being hinged to one end of the driving arm (223), the other end of the driving arm (223) being hinged to the driving slider (224), the hinge shafts at both ends of the driving arm (223) being arranged parallel to the hinge shaft of the anchor rod (200), and the driving slider (224) sliding along the strip groove (120) on the outer wall of the lower pile cylinder (100); The upper end of the lower pile cylinder (100) is provided with a drive cylinder (300), which is inserted into the lower pile cylinder (100); the upper end of the drive slider (224) extends out of the top slot of the strip groove (120) and is provided with a reset spring. The two ends of the reset spring are respectively connected to one end of the strip groove (120) and one end of the drive slider (224), and the lower end of the drive cylinder (300) abuts against the drive slider (224); A telescopic anchor rod (220) is sleeved on the anchor rod (200), and the connecting piece (221) of the drive mechanism is located at one end of the telescopic anchor rod (220) near the hinge shaft of the anchor rod (200); The lower pile cylinder (100) has a threaded connecting pipe (130) at its upper end, and the inner wall of the drive cylinder (300) is locked to the outer wall of the threaded connecting pipe (130) by threads; A stop bar (225) is provided below the hinge shaft of the anchor rod (200), and the stop bar (225) is provided along the width direction of the groove (120).

2. The composite foundation pile support structure according to claim 1, characterized in that, It includes a rotary drive cylinder (140), with a plurality of drive claws (141) arranged at the opening of the rotary drive cylinder (140), and a plurality of insertion openings (131) arranged on the outer wall of the upper end of the threaded connecting pipe (130), with the drive claws (141) extending into the insertion openings (131) respectively.

3. The composite foundation pile support structure according to claim 1, characterized in that, The anchor rod (200) has a grouting hole (210) at its free end. The end of the anchor rod (200) away from the free end is connected to an arc-shaped interface pipe (230). The arc-shaped interface pipe (230) is connected to the grouting hole (210). The bottom of the strip groove (120) is provided with an insertion hole (1201). The arc-shaped interface pipe (230) passes through the insertion hole (1201) and forms a sliding fit. The grouting hole (210) is connected to the grouting mechanism through the arc-shaped interface pipe (230).

4. The composite foundation pile support structure according to claim 3, characterized in that, The lower pile cylinder (100) has a pipe hole (150) on its outer wall. The grouting mechanism includes several grouting pipes (410). The grouting pipes (410) are connected to the pipe hole (150) and the arc-shaped interface pipe (230) respectively. The grouting pipes (410) are connected to the grouting main pipe (420). The grouting main pipe (420) is arranged along the length of the drive cylinder (300) and extends out of the upper end of the drive cylinder (300).

5. A composite foundation pile support structure according to claim 4, characterized in that, The system includes several strip grooves (160) that run through the lower pile tube (100) and are located on the inner wall of the lower pile tube (100). A sealing strip plate (170) is slidably installed in the strip groove (160). The grouting pipe (410) is connected to a telescopic grouting pipe (430). A return spring (431) is sleeved on the outer wall of the telescopic grouting pipe (430). The two ends of the return spring (431) abut against the pipe body of the telescopic grouting pipe (430) and the pipe opening of the grouting pipe (410), respectively. The pipe opening of the telescopic grouting pipe (430) abuts against the plate surface of the sealing strip plate (170).

6. A method for constructing a composite foundation, characterized in that, The construction of the composite foundation using the composite foundation pile support structure as described in claim 5 includes: Prepare the foundation surface and pre-drill holes in the foundation using drilling equipment; A guide pipe machine and a drilling rig are installed above the borehole. The lower pile cylinder (100) is hoisted into the guide pipe machine using hoisting equipment. The verticality of the lower pile cylinder (100) is adjusted using the guide pipe machine. The rotary drive cylinder (140) is hoisted to the upper position of the lower pile cylinder (100) and installed. The drill bit of the drilling rig is connected to the rotary drive cylinder (140). The drilling rig is started, which drives the rotary drive cylinder (140) to rotate, thereby causing the lower pile cylinder (100) to rotate into the borehole until it is drilled to the set depth. The rotary drive cylinder (140) is hoisted up using hoisting equipment, so that the rotary drive cylinder (140) is separated from the upper end of the lower pile cylinder (100). The drive cylinder (300) is hoisted into the guide pipe machine using hoisting equipment. The guide pipe machine is used to adjust the drive cylinder (300) and the lower pile cylinder (100) to be in a concentric state, and the drill bit of the drilling rig is aligned with the center of the drive cylinder (300). The drive cylinder (300) is rotated so that it is installed at the upper end of the lower pile cylinder (100). The anchor rod (200) is connected to the lower pile cylinder (100) at an angle with the lower pile cylinder (100) and the end is obliquely downward pointing to the lower end of the pile cylinder (100). This causes the telescopic anchor rod (220) on the anchor rod (200) to extend out of the anchor rod (200) and be inserted into the foundation soil. The sealing strip (170) is hoisted out of the lower pile tube (100) using hoisting equipment. The pipe opening of the telescopic grouting pipe (430) extends out of the pipe hole (150). The grouting mechanism is started to introduce concrete slurry into the grouting main pipe (420), so that the concrete slurry is introduced into the gap between the outer wall of the anchor rod (200) and the outer wall of the lower pile tube (100) until the concrete solidifies, and then the grouting is stopped. Following the above steps, composite foundation piles of different diameters and depths are introduced into the borehole. The upper end of the composite foundation piles is sealed, a steel cage is hoisted into the composite foundation pile, and concrete is poured in to form a solid concrete pile. Then, the subsequent foundation support construction above the mattress layer is carried out, and finally the composite foundation is formed.

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