Construction method of prefabricated hollow-core stiff pile with internal and external expanding wings

Abstract

The invention provides a construction method of a prefabricated hollow-core stiff pile with inner and outer expanding wings, and belongs to the field of prefabricated hollow-core stiff pile construction.The prefabricated hollow-core stiff pile comprises a stiff pile body and a supporting wing expanding device, a plurality of expanding units are arrayed in the axial direction of the stiff pile body, and each expanding unit is provided with a plurality of supporting wings in a circular array mode along the center line of the stiff pile body. Firstly, holes are formed in the ground, slurry is injected into the holes, then a stiff pile body with supporting wings temporarily fixed through iron sheets to be in an unfolded state and the bottom closed is placed in the holes, the slurry wraps the stiff pile body on the outer side, and a supporting wing expansion device is put down to the supporting wing at the uppermost position from the hollow position of the stiff pile body. The uppermost supporting wing can stop the supporting wing expansion device from continuing to descend, at the moment, the supporting wing expansion device is started to push the supporting wings to be pushed out towards the outer wall of the stiff pile body, then the supporting wing expansion device continues to descend, and the steps are repeated to sequentially push the supporting wings to be pushed out towards the outer wall of the stiff pile body from top to bottom.

Description

Technical Field

[0001] The invention belongs to the field of prefabricated hollow rigid pile construction, and in particular relates to a construction method of prefabricated hollow rigid piles with inner and outer wings. Background Art

[0002] Pile foundations, as a form of deep foundation, are widely used in projects such as buildings, bridges, ports, docks, wind power plants, and offshore platforms. Their primary function is to transfer the load of the superstructure to deeper, higher-bearing soil or rock layers, thereby meeting the structural requirements for bearing capacity, settlement control, and stability. Pile foundations are particularly important in projects with soft soil foundations, in earthquake-prone areas, for high-load structures, and in projects that need to resist horizontal forces (such as wind, wave forces, and ship impacts).

[0003] The Chinese invention patent with publication number "CN112359830A" discloses "a prefabricated hollow pile pipe flap-type pile shoe and construction method". During construction, the invention welds the flap-type pile shoe assembly to the bottom of the hollow pipe pile, ensuring that the flap is closed into a cone shape, with the cone tip located in the middle of the pile bottom, and the cone tip position error does not exceed 20mm. Then, the hollow pile pipe with the flap assembly is placed at the designated pile position using a lifting device, and then the hammer or static pressure equipment is started to sink the hollow pile pipe to the designed stratum and After the loading value reaches 80% of the design load value, the pile sinking is stopped, a steel pipe is used to hammer a wedge-shaped plug on the ground inside the hollow pile pipe to open multiple valves, and then a static pressure device is started to press the hollow pile pipe for a second time until the load reaches 100% of the design load value. The static pressure device is moved, and after the site is cleaned, concrete is poured and vibrated at the bottom of the pile pipe. The concrete pouring range should be 0.5-1 meter higher than the valve-type pile shoe to form an enlarged head at the pile bottom, thereby completing the construction of the prefabricated hollow pile pipe valve-type pile shoe. However, when the steel pipe is used to hammer the wedge-shaped plug, the distance that the valve rotates outward centrifugally is limited by the size of the hollow pile inner diameter and can only be equal to the radius of the hollow pile inner diameter. Therefore, the tip of the valve cannot reach the outer diameter of the pile edge from the pile center outward.

[0004] Therefore, the shortcoming is that the valve of the invention cannot rotate out of the outer diameter of the hollow pipe pile, so that the valve cannot expand under the hammering of the steel pipe, thereby failing to achieve bottom expansion. Summary of the Invention

[0005] In view of the above-mentioned shortcomings of the prior art, the object of the present invention is to provide a construction method of prefabricated hollow rigid piles with inner and outer wings, which is used to solve the problem that hollow pipe piles in the prior art cannot be expanded.

[0006] To achieve the above-mentioned and other related purposes, the present invention provides a method for constructing prefabricated hollow rigid piles with inner and outer wings, the method comprising: Hole-making steps: Drill a hole on the ground and inject slurry into the hole; Piling steps: Place the prefabricated hollow rigid pile in the hole, wrap the prefabricated hollow rigid pile on the outside with slurry, and keep the hollow part of the prefabricated hollow rigid pile dry; Expansion steps: lower the wing extension device from the prefabricated hollow rigid pile to the wing at the uppermost position. The uppermost wing will prevent the wing extension device from continuing to be lowered. At this time, turn on the wing extension device, and the wing extension device pushes the wing to push it toward the outer wall of the prefabricated hollow rigid pile. Then the wing extension device continues to be lowered, and the above steps are repeated from top to bottom to push the wing toward the outer wall of the prefabricated hollow rigid pile.

[0007] As an optional solution, in the piling step, prefabricating hollow rigid piles includes: A rigid pile body, wherein the upper and lower end surfaces of the rigid pile body are penetrated by first through holes; A plurality of expansion units, wherein the expansion units are arrayed along the axial direction of the rigid pile body, each of the expansion units includes a plurality of expansion modules, and the expansion modules are arranged in a circular array along the center line of the rigid pile body, each of the expansion modules includes a wing and a second through hole, the second through hole is provided on the rigid pile body, and the second through hole passes through the inner and outer side walls of the rigid pile body, the wing is fan-shaped, the wing is rotatably mounted in the second through hole, the rotation axis of the wing is perpendicular to the center line of the rigid pile body, and the rotation axis of the wing is located in the second through hole; When the wing is not unfolded, part of the wing is located in the rigid pile body; During the process of the wing rotating to the expanded state, the wing continues to close the second through hole, and a part of the wing is located outside the rigid pile body.

[0008] As an optional solution, the upper end surface of the wing is arc-shaped, and the central axis of the upper end surface of the wing coincides with the rotation axis of the wing; The upper end surface of the second through hole is in contact with the upper end surface of the wing.

[0009] As an optional solution, the expansion module further includes a mounting slot, a first spring, a limit block and a limit slot; The mounting groove is formed on the lower end surface of the second through hole, one end of the first spring is fixedly connected to the lower end of the mounting groove, and the other end of the first spring is fixedly connected to the limit block, and the expansion and contraction direction of the first spring is consistent with the axial direction of the mounting groove; The rotation axis of the wing is located at the upper part of the second through hole, and a limiting groove is provided on the lower end surface of the wing. When the wing rotates to the unfolded state in the second through hole, the limiting block extends into the limiting groove under the action of the first spring.

[0010] As an optional solution, the lower end surface of the second through hole is an arc-shaped surface; The lower end surface of the second through hole is in contact with the lower end surface of the wing.

[0011] As an optional solution, when the wing is not unfolded, the maximum distance the wing extends into the first through hole is z; The cross section of the first through hole is square, and one end surface of the wing is in contact with one side wall of the square first through hole; The side wall of the square first through hole that is in contact with the wing is the first side wall, and the side wall of the square first through hole that is parallel to the first side wall is the second side wall; The distance between the other end surface of the wing and the second side wall is greater than or equal to z.

[0012] As an optional solution, in the piling step, before the prefabricated hollow rigid pile is placed in the hole, the bottom of the prefabricated hollow rigid pile is sealed.

[0013] As an optional solution, in the expansion step, the wing expansion device includes a first mounting frame, a second mounting frame, a telescopic power source and a plurality of articulated modules; The fixed end of the telescopic power source is fixedly mounted on the first mounting frame, and the extended end of the telescopic power source is fixedly mounted on the second mounting frame, and the first mounting frame is located above the second mounting frame; When the wing expansion device is placed in the rigid pile body, the axial direction of the telescopic power source coincides with the center line of the rigid pile body; Several of the articulated modules are arranged in a circular array along the axial direction of the telescopic power source, and each of the articulated modules includes a first rotating block and a second rotating block. One end of the first rotating block is hinged to the first mounting frame, the other end of the first rotating block is hinged to one end of the second rotating block, and the other end of the second rotating block is hinged to the second mounting frame. Under the action of the telescopic power source, the first rotating block and the second rotating block push the support wings toward the outer wall of the rigid pile body.

[0014] As an optional solution, the wing extension device further includes a transverse limiting rod; The transverse limiting rod is fixedly mounted on the upper end surface of the first mounting frame, the length direction of the transverse limiting rod is perpendicular to the axial direction of the telescopic power source, and the length of the transverse limiting rod is the same as the length of the diagonal of the first through hole; When the wing expansion device is placed in the rigid pile body, both ends of the transverse limiting rod in the length direction have mutually perpendicular surfaces, and the mutually perpendicular surfaces at both ends of the transverse limiting rod in the length direction are in contact with the two adjacent side walls of the first through hole.

[0015] As an optional solution, the wing extension device further includes a vertical limiting rod; The lower end of the vertical limiting rod is fixedly mounted on one end of the transverse limiting rod in the length direction, and the length direction of the vertical limiting rod is perpendicular to the length direction of the transverse limiting rod; When the wing expansion device is placed in the rigid pile body, two side walls of the vertical limiting rod are in contact with two adjacent side walls of the first through hole.

[0016] As described above, the construction method of a prefabricated hollow rigid pile with inner and outer wings of the present invention has at least the following beneficial effects: 1. After the existing prefabricated piles are sunk, the soil has its own weight stress and the pressure of the deep soil is so large that the wings on the pile body cannot be expanded into the deep soil. The present invention is a construction process for the rigid pile body. The horizontal cross-section of the soil layer is the original soil, slurry, and the rigid pile body in sequence. When the rigid pile body with the wings fixed and the bottom closed is placed in the opened hole, the central axis of the rigid pile body coincides with the central axis of the hole, and the outer wall of the rigid pile body and the inner wall of the hole leave space for slurry filling. When the wing expansion device pushes the wings toward the outer wall of the rigid pile body, the pushed-out wings located outside the rigid pile body are wrapped by the slurry. At this time, the slurry has not completely solidified, thereby ensuring that the wings can be smoothly pushed toward the outer wall of the rigid pile body and contact with the original soil. After the slurry solidifies, the rigid pile body forms an expanded bottom, thereby solving the problem of pull-out resistance.

[0017] 2. When the existing hollow pipe pile is provided with multiple wings along the axial direction, after all the wings are stretched out from top to bottom by the expansion device, the upper wings will return to the position partially located inside the hollow pipe pile when the lower wings are stretched out. When the expansion device is taken out from the bottom, it will be blocked by the upper wings, resulting in the expansion device being unable to be taken out from the bottom of the hollow pipe pile. The wing expansion device of the present invention pushes the wings toward the outer wall of the rigid pile body, and after the limit block is pushed into the limit groove under the action of the first spring, the wings are automatically fixed to the expanded state, so that the wing expansion device does not need to keep pushing the wings in the expanded state, and the wings will not return to the position partially located inside the rigid pile body, so as to ensure that the wing expansion device will not be blocked by the upper wings when it is taken out from the bottom, and the wing expansion device can be smoothly taken out from the bottom of the rigid pile body, and the structural design is ingenious.

[0018] 3. The wings of the present invention are arranged in an array along the axial direction of the rigid pile body. When the rigid pile body with the wings fixed and the bottom closed is placed in the opened hole, since the wings are installed in the axial direction of the rigid pile body from top to bottom, the rigid pile body can be rotated from top to bottom to an expanded state (that is, part of the area is located outside the rigid pile body) during subsequent construction to improve the bearing capacity of the rigid pile body. The structural design is ingenious, and the overall stability of the rigid pile body after construction is good.

[0019] 4. In the present invention, when the wing is not unfolded, part of the wing is located in the rigid pile body. After the wing expansion device is lowered into the rigid pile body, the part of the wing located in the rigid pile body will position the wing expansion device. That is, when the wing expansion device is lowered to contact the part of the wing located in the rigid pile body, the wing expansion device cannot be lowered further due to the obstruction of the wing. At this time, it can be known that the wing expansion device has been lowered to the working position. That is, the wing can now be accurately pushed toward the outer wall of the rigid pile body through the wing expansion device. The coordination between the structures is ingenious.

[0020] 5. The present invention can control the distance between the wing and the second side wall to adjust the area of ​​the wing located outside the rigid pile body when the wing is rotated from an undeployed state to an unfolded state. When the wing is not unfolded, the maximum distance the wing extends into the first through hole is z. When the distance between the wing and the second side wall is equal to z, the area of ​​the wing located outside the rigid pile body when the wing is rotated from the undeployed state to the unfolded state is the largest. At this time, the bearing capacity of the wing is the best, so that the stability of the rigid pile body can be enhanced to the greatest extent by adjusting the distance between the wing and the second side wall.

[0021] 6. After the present invention temporarily fixes the wings with iron sheets and places the rigid pile body with the closed bottom in the hole, part of the wing is located in the rigid pile body. When the wing expansion device is lowered from the rigid pile body to the hinge of the first rotating block and the second rotating block and contacts the part of the wing located in the rigid pile body, the wing expansion device will be stuck by the wing. At this time, the telescopic power source can be started to push the wing toward the outer wall of the rigid pile body, so that after the upper layer of wings is unfolded, it can continue to be lowered to the next layer of wings, and the above steps are repeated to unfold the wings of the next layer, so that all the wings from top to bottom can be pushed toward the outer wall of the rigid pile body through the hinge of the first rotating block and the second rotating block under the action of the telescopic power source. The structural design is ingenious.

[0022] 7. In the present invention, since the length of the transverse limit rod is the same as the length of the diagonal of the first through hole, when the wing expansion device is placed in the rigid pile body, the mutually perpendicular surfaces at both ends of the transverse limit rod in the length direction are in contact with the two adjacent side walls corresponding to the first through hole. Therefore, when the transverse limit rod is lowered into the rigid pile body, the transverse limit rod is lowered horizontally in a state parallel to the diagonal of the first through hole, so that the wing expansion device will only move in the axial direction of the rigid pile body when it is lowered in the prefabricated hollow rigid pile, and will not slide or rotate in the horizontal direction inside the rigid pile body, thereby ensuring the stability of the wing expansion device during operation.

[0023] 8. According to the present invention, when the wing expansion device is placed in the rigid pile body, two side walls of the vertical limit rod are in contact with the two side walls adjacent to the first through hole. Therefore, when the vertical limit rod is lowered into the rigid pile body, the vertical limit rod extends into the rigid pile body from top to bottom by keeping its two side walls in contact with the two side walls adjacent to the first through hole. Moreover, the vertical limit rod is fixedly installed at one end in the length direction of the transverse limit rod, so that when the wing expansion device is lowered in the rigid pile body, it will only move in the axial direction of the rigid pile body and will not tip over along the diagonal direction of the first through hole, thereby ensuring the stability of the wing expansion device during operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 Shown is a schematic diagram of the three-dimensional structure of the present invention when the wings are expanded; Figure 2 Shown is a schematic structural diagram of the second through hole and the mounting groove of the present invention; Figure 3 Shown is a cross-sectional view of the internal structure of the rigid pile body of the present invention; Figure 4 Shown is a schematic structural diagram of the wing expansion device of the present invention; Figure 5 Shown is a schematic diagram of the dimension marking structure of the first through hole and the maximum distance of the wing extending into the first through hole of the present invention; Figure 6 Shown is a schematic structural diagram of the extended wing and expanded bottom of the present invention; Figure 7 Shown is a partial cross-sectional view of the sliding block of the present invention; Figure 8 Shown is a schematic structural diagram of the length of the connecting rope and the height of the inner hammer of the present invention; Figure 9 A schematic structural diagram showing the distance between the upper end surface of the impact bullet head and the upper end surface of the sliding block of the present invention; Figure 10 Shown is a schematic diagram of the structure of the present invention when the extendable wing is not unfolded; Figure 11Shown is a schematic structural diagram of the present invention when the extendable wings are unfolded.

[0025] In the figure: 101, rigid pile body; 102, first through hole; 201, wing; 202, second through hole; 301, mounting slot; 302, first spring; 303, limit block; 304, limit slot; 401, first mounting frame; 402, second mounting frame; 403, telescopic power source; 404, first rotating block; 405, second rotating block; 501, horizontal limit rod; 502, vertical limit rod; 601. Impact bullet head; 602. Extended wings; 603. Steel bars; 701, mounting block; 702, second spring; 703, sliding block; 704, inner hammer; 705, connecting rope; 706, hammer lifting block; 707, third through hole; 708, groove; 709, fourth through hole. DETAILED DESCRIPTION

[0026] The following describes the implementation of the present invention through specific embodiments. People skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0027] See also Figures 1 to 11 . It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention. Therefore, they have no substantive 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 that can be achieved by the present invention. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description, and are not used to limit the scope of the implementation of the present invention. Changes or adjustments in their relative relationships should also be regarded as the scope of the implementation of the present invention without substantially changing the technical content.

[0028] The following embodiments are for illustration only and can be combined with each other, and are not limited to the contents presented in the following single embodiments.

[0029] See also Figures 1 to 11 The present invention provides a method for constructing a prefabricated hollow rigid pile with inner and outer wings, the method comprising: Drilling steps: Drill a hole on the ground and inject slurry into the hole. After the drilling is completed, lift the drilling equipment out of the hole; In the hole-making step, the diameter of the hole may be 700 mm; Pile installation step: temporarily fix the wing 201 in the state when the wing 201 is not unfolded by using an iron sheet, that is, a part of the iron sheet is bonded to the outer wall of the prefabricated hollow rigid pile, and the other part of the iron sheet is bonded to the wing 201, and the bottom of the prefabricated hollow rigid pile is sealed. After sealing, the prefabricated hollow rigid pile is placed in the hole, and the slurry is wrapped around the prefabricated hollow rigid pile on the outside, and the hollow interior of the prefabricated hollow rigid pile remains dry; In the pile-setting step, the cross-section of the prefabricated hollow rigid pile can be a square with a side length of 400 mm, and the central axis of the prefabricated hollow rigid pile placed in the hole coincides with the central axis of the hole; Expansion steps: lower the wing expansion device from the prefabricated hollow rigid pile to the wing 201 at the uppermost position. The uppermost wing 201 will prevent the wing expansion device from continuing to be lowered. At this time, turn on the wing expansion device, and the wing expansion device pushes the wing 201 to push away the temporarily fixed iron sheet and then continues to push the wing 201 toward the outer wall of the prefabricated hollow rigid pile. After being pushed out, the part of the wing 201 located on the outer side of the prefabricated hollow rigid pile is wrapped with slurry. Then the wing expansion device continues to be lowered, and the above steps are repeated to push the wing 201 toward the outer wall of the prefabricated hollow rigid pile from top to bottom. After all the wings 201 are pushed out, take the wing expansion device out of the prefabricated hollow rigid pile.

[0030] See also Figures 1 to 3 In the piling step, the prefabricated hollow rigid piles include: A rigid pile body 101, wherein the upper and lower end surfaces of the rigid pile body 101 are penetrated by first through holes 102; A plurality of expansion units, wherein the plurality of expansion units are arrayed along the axial direction of the rigid pile body 101, each of the expansion units includes a plurality of expansion modules, and the plurality of expansion modules are arranged in a circular array along the center line of the rigid pile body 101, each of the expansion modules includes a wing 201 and a second through hole 202, wherein the second through hole 202 is provided on the rigid pile body 101, and the second through hole 202 passes through the inner and outer side walls of the rigid pile body 101, the wing 201 is fan-shaped, and the wing 201 is rotatably mounted in the second through hole 202, the rotation axis of the wing 201 is perpendicular to the center line of the rigid pile body 101, and the rotation axis of the wing 201 is located in the second through hole 202; When the wing 201 is not unfolded, part of the wing 201 is located inside the rigid pile body 101; During the process of the wing 201 rotating to the unfolded state, the wing 201 continues to close the second through hole 202 , and a portion of the wing 201 is located outside the rigid pile body 101 .

[0031] In this embodiment, when a prefabricated hollow rigid pile is used for construction, the wing 201 can be temporarily fixed by an iron sheet in a state where the wing 201 is not unfolded. Specifically, a part of the iron sheet is bonded to the outer wall of the rigid pile body 101, and another part of the iron sheet is bonded to the wing 201. When the iron sheet temporarily fixes the wing 201 in a state where the wing 201 is not unfolded, the wing 201 and the side wall of the second through hole 202 close to the outside of the rigid pile body 101 are flush. At this time, the wing 201 completely fills the second through hole. Hole 202, since the shape of the wing 201 is fan-shaped, the wing 201 is tilted and extends into the first through hole 102. Through the above method, all the wings 201 from top to bottom of the rigid pile body 101 are temporarily fixed in the state when the wings 201 are not unfolded, and then the rigid pile body 101 with the wings 201 fixed and the bottom closed is placed in the hole. After the wings 201 are rotated to the unfolded state, the wings 201 still completely fill the second through hole 202, and part of the area of ​​the wings 201 is located outside the rigid pile body 101.

[0032] The support wings 201 of the present invention are arranged in an array along the axial direction of the rigid pile body 101. When the rigid pile body 101 with the support wings 201 fixed and the bottom closed is placed in the hole, since the support wings 201 are rotated and installed in the axial direction of the rigid pile body 101 from top to bottom, during subsequent construction, the rigid pile body 101 can be rotated from top to bottom to the expanded state through the support wings 201 to improve the bearing capacity of the rigid pile body 101, and the support wings 201 before and after expansion completely fill the second through hole 202. The support wings 201 axially support the rigid pile body 101 by closing the second through hole 202, thereby ensuring that the axial bearing capacity of the rigid pile body 101 will not be weakened after the support wings 201 are rotated to the expanded state. The structural design is ingenious, and the rigid pile body 101 has good stability after construction.

[0033] See also Figure 2 and Figure 3 , the upper end surface of the wing 201 is arc-shaped, and the central axis of the upper end surface of the wing 201 coincides with the rotation axis of the wing 201; The upper end surface of the second through hole 202 is in contact with the upper end surface of the wing 201 .

[0034] In this embodiment, after the support wings 201 are temporarily fixed by iron sheets and the rigid pile body 101 with a closed bottom is placed in the hole, slurry is injected into the hole so that the slurry wraps the rigid pile body 101 on the outside. Then, when the support wings 201 rotate from the undeployed state to the deployed state, the support wings 201 rotate along the rotation axis of the support wings 201.

[0035] During the process of the wing 201 of the present invention rotating from the undeployed state to the deployed state, the upper end surface of the second through hole 202 and the upper end surface of the wing 201 are always kept in contact with each other, thereby ensuring that the wing 201 closes the upper end surface of the second through hole 202 during the deployment process, so that the slurry will not flow into the rigid pile body 101 from the upper end surface of the second through hole 202.

[0036] See also Figure 2 and Figure 3 , the expansion module also includes a mounting slot 301, a first spring 302, a limiting block 303 and a limiting slot 304; The mounting groove 301 is formed on the lower end surface of the second through hole 202. One end of a first spring 302 is fixedly connected to the lower end of the mounting groove 301. The other end of the first spring 302 is fixedly connected to a limit block 303. The expansion and contraction direction of the first spring 302 is consistent with the axial direction of the mounting groove 301. The rotation axis of the wing 201 is located at the upper part of the second through hole 202, and the lower end surface of the wing 201 is provided with a limiting groove 304. When the wing 201 rotates to the unfolded state in the second through hole 202, the limiting block 303 extends into the limiting groove 304 under the action of the first spring 302.

[0037] In this embodiment, after the support wing 201 is temporarily fixed by the iron sheet and the rigid pile body 101 with a closed bottom is placed in the hole, the lower end surface of the support wing 201 squeezes the limit block 303 into the installation groove 301, and the limit block 303 compresses the first spring 302 to a compressed state. After slurry is injected into the hole so that the slurry wraps the rigid pile body 101 on the outside, when the support wing 201 rotates from the unexpanded state to the expanded state, the limit groove 304 rotates to an axial direction consistent with the expansion and contraction direction of the first spring 302. At this time, the first spring 302 extends from the compressed state to the natural state, and the limit block 303 extends into the limit groove 304 to lock it when extending from the compressed state to the natural state, that is, the state of the support wing 201 is now the expanded state.

[0038] In the present invention, when the wing 201 rotates from the undeployed state to the deployed state, the first spring 302 is restored from the compressed state to the natural state to extend the limit block 303 into the limit groove 304, so that the wing 201 can automatically maintain the deployed state after rotating to the deployed state, and will not be squeezed back to the undeployed state by the slurry wrapped on the outside of the rigid pile body 101. The structural design is ingenious.

[0039] See also Figure 2 and Figure 3 , the lower end surface of the second through hole 202 is an arc-shaped surface; The lower end surface of the second through hole 202 is in contact with the lower end surface of the wing 201 .

[0040] In this embodiment, after the bracing wing 201 is temporarily fixed by the iron sheet and the bottom of the stiff pile body 101 is closed and placed in the hole, the slurry is injected into the hole so that the slurry wraps the stiff pile body 101 on the outside, and then the lower end surface of the bracing wing 201 is kept in close contact with the lower end surface of the second through hole 202 during the process of rotating the bracing wing 201 from the unexpanded state to the expanded state.

[0041] During the process of rotating the bracing wing 201 from the unexpanded state to the expanded state, the lower end surface of the second through hole 202 is always kept in close contact with the lower end surface of the bracing wing 201, so as to ensure that the lower end surface of the second through hole 202 is closed by the bracing wing 201 during the expansion process of the bracing wing 201, so that the slurry cannot flow into the stiff pile body 101 from the lower end surface of the second through hole 202.

[0042] Please refer to Figure 3 and Figure 5 , when the bracing wing 201 is unexpanded, the maximum distance value z of the bracing wing 201 extending into the first through hole 102; The cross section of the first through hole 102 is a square, and one end surface of the bracing wing 201 is in close contact with one side wall of the square first through hole 102; The side wall of the square first through hole 102 in close contact with the bracing wing 201 is the first side wall, and the side wall of the square first through hole 102 parallel to the first side wall is the second side wall; The distance between the other end surface of the bracing wing 201 and the second side wall is greater than or equal to z.

[0043] In this embodiment, since one end surface of the bracing wing 201 is in close contact with the first side wall, when the distance between the other end surface of the bracing wing 201 and the second side wall is equal to z, during the process of rotating the bracing wing 201 from the unexpanded state to the expanded state, the area of the bracing wing 201 located in the outer partial region of the stiff pile body 101 is the largest, and the distance between the other end surface of the bracing wing 201 and the second side wall is selected as z in this embodiment; As the distance between the other end surface of the bracing wing 201 and the second side wall is greater than z and gradually increases, during the process of rotating the bracing wing 201 from the unexpanded state to the expanded state, the area of the bracing wing 201 located in the outer partial region of the stiff pile body 101 gradually decreases.

[0044] The present invention can control the distance between the other end face of the wing 201 and the second side wall to adjust the area of ​​the wing 201 located outside the rigid pile body 101 when the wing 201 is rotated from the undeployed state to the deployed state. When the area is maximized, that is, when the distance between the other end face of the wing 201 and the second side wall is equal to z, the area of ​​the wing 201 located outside the rigid pile body 101 is maximized. At this time, the bearing capacity of the wing 201 is the best, thereby enhancing the stability of the rigid pile body 101 to the greatest extent.

[0045] See also Figure 1 In the piling step, before the prefabricated hollow rigid pile is placed in the hole, the bottom of the prefabricated hollow rigid pile is sealed; Here, the bottom of the prefabricated hollow rigid pile can be sealed by welding a steel plate to the bottom of the prefabricated hollow rigid pile.

[0046] In this embodiment, after the rigid pile body 101 with the support wings 201 temporarily fixed by iron sheets and the bottom sealed by steel plates is placed in the hole, the slurry in the hole wraps around the rigid pile body 101 on the outside because the lower end surface of the rigid pile body 101 is sealed by the steel plate.

[0047] In the present invention, the lower end surface of the rigid pile body 101 is sealed and placed into the hole, so that the first through hole 102 of the rigid pile body 101 remains dry after the rigid pile body 101 is placed into the hole, thereby allowing the wing expansion device to be smoothly lowered into the rigid pile body 101 for subsequent construction steps.

[0048] See also Figure 1 、 Figure 3 and Figure 4 In the expansion step, the wing expansion device includes a first mounting frame 401, a second mounting frame 402, a telescopic power source 403 and a plurality of articulated modules; The telescopic power source 403 is not limited here. Its function is to provide telescopic power, and it can be a cylinder, a hydraulic cylinder, etc. The fixed end of the telescopic power source 403 is fixedly mounted on the first mounting frame 401, and the extended end of the telescopic power source 403 is fixedly mounted on the second mounting frame 402. The first mounting frame 401 is located above the second mounting frame 402. When the wing expansion device is placed in the rigid pile body 101, the axial direction of the telescopic power source 403 coincides with the center line of the rigid pile body 101; The number of the articulated modules is the same as the number of the expansion modules of each expansion unit; Several articulated modules are arranged in a circular array along the axial direction of the telescopic power source 403, and each articulated module includes a first rotating block 404 and a second rotating block 405. One end of the first rotating block 404 is hinged to the first mounting frame 401, and the other end of the first rotating block 404 is hinged to one end of the second rotating block 405. The other end of the second rotating block 405 is hinged to the second mounting frame 402. Under the action of the telescopic power source 403, the first rotating block 404 and the second rotating block 405 push the support wing 201 toward the outer wall of the rigid pile body 101.

[0049] In this embodiment, after the support wings 201 are temporarily fixed by iron sheets and the rigid pile body 101 with a closed bottom is placed in the hole, slurry is injected into the hole. The slurry is injected from the outside of the rigid pile body 101 so that the slurry wraps the rigid pile body 101 on the outside. Then, the support wing expansion device is lowered from the rigid pile body 101 to the support wing 201 at the uppermost position. The uppermost support wing 201 will block the support wing expansion device from continuing to be lowered. At this time, the telescopic power source 403 is turned on and the telescopic power source 403 is retracted so that the first rotating block 404 and the second rotating block 405 are aligned. For rotation, at this time, the hinge of the first rotating block 404 and the second rotating block 405 pushes the support wing 201 to push the temporarily fixed iron sheet away and continue to push the support wing 201 toward the outer wall of the rigid pile body 101. After the limit block 303 is extended into the limit groove 304 under the action of the first spring 302, the telescopic power source 403 is extended to the initial position. Thereafter, the support wing expansion device continues to be lowered, and the above steps are repeated from top to bottom to push the support wing 201 toward the outer wall of the rigid pile body 101 through the hinge of the first rotating block 404 and the second rotating block 405.

[0050] After the support wing 201 is temporarily fixed by the iron sheet and the rigid pile body 101 with the closed bottom is placed in the hole, part of the support wing 201 is located in the rigid pile body 101. When the support wing expansion device is lowered from the rigid pile body 101 to the hinged joint of the first rotating block 404 and the second rotating block 405 and contacts the part of the support wing 201 located in the rigid pile body 101, the support wing expansion device will be stuck by the support wing 201. At this time, the telescopic power source 403 can be started to push the support wing 201 toward the outer wall of the rigid pile body 101 until the limit block 303 is pressed against the first spring 30 2, after the wings 201 are extended into the limiting grooves 304, they are automatically fixed to the expanded state. As a result, the wing expansion device does not need to keep the wings 201 in the expanded state. Instead, after the wings 201 of the upper layer are expanded, they can continue to be lowered to the wings 201 of the next layer, and the above steps are repeated to expand the wings 201 of the next layer. As a result, all the wings 201 from top to bottom can be pushed toward the outer wall of the rigid pile body 101 through the hinge of the first rotating block 404 and the second rotating block 405 under the action of the telescopic power source 403. The structural design is ingenious.

[0051] See also Figure 3 and Figure 4 , the wing expansion device also includes a transverse limiting rod 501; The transverse limiting rod 501 is fixedly mounted on the upper end surface of the first mounting frame 401. The length direction of the transverse limiting rod 501 is perpendicular to the axial direction of the telescopic power source 403. The length of the transverse limiting rod 501 is the same as the length of the diagonal of the first through hole 102. When the wing expansion device is placed in the rigid pile body 101 , both ends of the transverse limiting rod 501 in the length direction have mutually perpendicular surfaces, and the mutually perpendicular surfaces at both ends of the transverse limiting rod 501 in the length direction fit with the two adjacent side walls of the first through hole 102 .

[0052] In this embodiment, when the wing expansion device is placed in the rigid pile body 101, the mutually perpendicular surfaces at both ends of the length direction of the transverse limiting rod 501 remain in contact with the two adjacent side walls of the first through hole 102 and extend into the rigid pile body 101 from top to bottom.

[0053] In the present invention, since the length of the transverse limiting rod 501 is the same as the length of the diagonal of the first through hole 102, and when the wing expansion device is placed in the rigid pile body 101, the mutually perpendicular surfaces at both ends of the transverse limiting rod 501 in the length direction are in contact with the two adjacent side walls of the first through hole 102, so when the transverse limiting rod 501 is placed in the rigid pile body 101, the transverse limiting rod 501 is placed horizontally downward in a state parallel to the diagonal of the first through hole 102, so that the wing expansion device will only move in the axial direction of the rigid pile body 101 when it is lowered in the rigid pile body 101, and will not slide or rotate in the horizontal direction inside the rigid pile body 101, thereby ensuring the stability of the wing expansion device during operation.

[0054] See also Figures 3 to 5 , the wing extension device also includes a vertical limiting rod 502; The length of the vertical limiting rod 502 is L, and the side length of the cross section of the first through hole 102 is a; L≥2a; The lower end of the vertical limiting rod 502 is fixedly mounted on one end of the transverse limiting rod 501 in the length direction, and the length direction of the vertical limiting rod 502 is perpendicular to the length direction of the transverse limiting rod 501; When the wing expansion device is placed in the rigid pile body 101 , two side walls of the vertical limiting rod 502 fit in with two adjacent side walls of the first through hole 102 .

[0055] In this embodiment, when the wing expansion device is placed in the rigid pile body 101, the mutually perpendicular surfaces at both ends of the length direction of the transverse limiting rod 501 remain in contact with the two adjacent side walls of the first through hole 102 and extend from top to bottom into the rigid pile body 101, and the two side walls of the vertical limiting rod 502 remain in contact with the two adjacent side walls of the first through hole 102 and extend from top to bottom into the rigid pile body 101; The lowering method of the wing expansion device is not limited here. For example, when the upper end surface of the vertical limiting rod 502 is higher than the upper end surface of the rigid pile body 101 when the wing 201 at the bottom of the rigid pile body 101 is pushed toward the outer wall of the rigid pile body 101 by the wing expansion device, the wing expansion device can be lowered by continuing to lower the vertical limiting rod 502. For example, when the upper end surface of the vertical limiting rod 502 is lower than the upper end surface of the rigid pile body 101 when the wing 201 at the bottom of the rigid pile body 101 is pushed toward the outer wall of the rigid pile body 101 by the wing expansion device, the vertical limiting rod 502 can be lowered. The positioning rod 502 is set to be splicable. Here, a stud can be set on the bottom end face of the upper vertical limiting rod 502, and a threaded hole can be set on the top end face of the lower vertical limiting rod 502. The stud is threadedly connected to the threaded hole to realize the splicing of the upper and lower vertical limiting rods 502. By splicing multiple vertical limiting rods 502 up and down until the top vertical limiting rod 502 is higher than the upper end face of the rigid pile body 101, when the wing expansion device is working, the vertical limiting rod 502 extending out of the upper end face of the rigid pile body 101 is manually fixed to ensure that the wing expansion device does not move upward when working.

[0056] In the present invention, when the wing expansion device is placed in the rigid pile body 101, two side walls of the vertical limiting rod 502 are in contact with the two side walls adjacent to the first through hole 102. Therefore, when the rigid pile body 101 is placed under the vertical limiting rod 502, the vertical limiting rod 502 extends into the rigid pile body 101 from top to bottom with its two side walls remaining in contact with the two side walls adjacent to the first through hole 102, and the vertical limiting rod 502 is fixedly installed at one end in the length direction of the transverse limiting rod 501, so that when the wing expansion device is lowered in the rigid pile body 101, it will only move in the axial direction of the rigid pile body 101, and will not tip over along the diagonal direction of the first through hole 102, thereby ensuring the stability of the wing expansion device during operation.

[0057] See also Figure 6 、 Figure 10 and Figure 11 As another embodiment of the present invention, when the lower end surface of the rigid pile body 101 is sealed, the impact bullet head 601 is filled to the bottom of the first through hole 102, and the side wall of the impact bullet head 601 and the inner wall of the first through hole 102 are sealed by a sealing ring. In this case, the lower end surface of the rigid pile body 101 is not sealed by a steel plate; A bottom expansion unit is provided on the lower end surface of the rigid pile body 101, and the bottom expansion unit includes a plurality of extension wings 602. The plurality of extension wings 602 are arranged in a circular array along the center line of the rigid pile body 101. The extension wings 602 are in the shape of a triangular prism. Each of the extension wings 602 is hinged to the lower end surface of the rigid pile body 101, and the rotation axis of the hinged portion of the extension wings 602 is perpendicular to the center line of the rigid pile body 101. When the extending wings 602 are not unfolded, a plurality of the extending wings 602 close the lower end surface of the first through hole 102; When the extending wings 602 are not unfolded, some of the extending wings 602 do not completely close the lower end surface of the first through hole 102; When the extending wing 602 rotates to the expanded state, the extending wing 602 opens the lower end surface of the first through hole 102, and the extending wing 602 forms an expanded bottom at the bottom end of the rigid pile body 101; In the piling step, the bottom expansion unit may be formed by embedding a steel bar 603 on each extension wing 602 and then tying all the steel bars 603 together with wires to temporarily fix the extension wings 602 to an unexpanded state. After the expansion step is completed, the impact bullet head 601 at the bottom of the first through hole 102 is repeatedly hammered using a hammer limit device, so that the impact bullet head 601 pushes the extension wing 602 at the bottom of the rigid pile body 101 to stretch the wire and then continue to expand the extension wing 602 toward the outer wall of the prefabricated hollow rigid pile.

[0058] In this embodiment, when prefabricated hollow rigid piles are used for construction, the bottom of the rigid pile body 101 can be first filled with the impact bullet head 601 from the bottom end of the rigid pile body 101 upward to the bottom of the first through hole 102, so that the impact bullet head 601 closes the bottom of the first through hole 102. Then, because each extending wing 602 is embedded with a steel bar 603, all the steel bars 603 are tied together by wire to temporarily fix the several extending wings 602 to an undeployed state. A hole is opened on the ground, and slurry is injected into the hole. Then, the rigid pile body 101 with the extending wings 602 and the support wings 201 temporarily fixed is placed in the hole. After the support wings 201 are pushed to the deployed state by the support wing expansion device, the extending wings 602 open the bottom of the first through hole 102 under repeated hammering of the hammer limit device, and the extending wings 602 are deployed toward the outer wall of the rigid pile body 101.

[0059] The extension wings 602 of the present invention are arranged in a circular array along the center line of the rigid pile body 101. After the rigid pile body 101 with the extension wings 602 temporarily fixed is placed in the hole, the extension wings 602 are rotated to the expanded state when the extension wings 602 expand the bottom to increase the pile end resistance of the rigid pile body 101. The structural design is simple, the production cost is low, and the rigid pile body 101 after construction has good stability.

[0060] See also Figure 10 and Figure 11 , the side walls of the extending wing 602 include a first side wall, a second side wall and a third side wall; The number of the extendable wings 602 can be four. When the extendable wings 602 are not unfolded, the third side walls of the extendable wings 602 are flush with the corresponding outer side walls of the rigid pile body 101, the first side wall of one of the extendable wings 602 is aligned with the second side wall of another adjacent extendable wing 602, and the second side wall of one of the extendable wings 602 is aligned with the first side wall of another adjacent extendable wing 602.

[0061] In this embodiment, when the extendable wings 602 close the lower end surface of the first through hole 102, the first side wall on one of the extendable wings 602 fits with the second side wall on another adjacent extendable wing 602, and the second side wall on one of the extendable wings 602 fits with the first side wall on another adjacent extendable wing 602, so that the side walls between two adjacent extendable wings 602 among the four extendable wings 602 are all fit together, so that the four extendable wings 602 are temporarily fixed in the unfolded state.

[0062] See also Figure 10 and Figure 11 A steel bar 603 is embedded at the intersection of the first side wall and the second side wall of the extending wing 602. The upper end surface of the steel bar 603 is flush with the upper end surface of the extending wing 602, and the lower end surface of the steel bar 603 extends out of the lower end surface of the extending wing 602.

[0063] In this embodiment, when all the extending wings 602 are rotated to the undeployed state, all the steel bars 603 are tied together by wires to temporarily fix the extending wings 602 to the undeployed state.

[0064] When closing the lower end surface of the first through hole 102, the present invention ties together a plurality of steel bars 603 by means of wire, so that all the extending wings 602 are temporarily fixed in an unfolded state, thereby ensuring that the extending wings 602 will not be unfolded to open the lower end surface of the first through hole 102 when the rigid pile body 101 is subsequently placed into the hole. The structural design is ingenious.

[0065] See also Figure 10When the extending wing 602 is not unfolded, the rotation axis of the extending wing 602 at the hinge is at the same height as the upper end surface of the extending wing 602.

[0066] In this embodiment, when the extending wing 602 rotates along the rotation axis of the hinge of the extending wing 602 , the upper end surface of the extending wing 602 always rotates in a posture not higher than the rotation axis of the hinge of the extending wing 602 .

[0067] See also Figure 6 and Figure 10 In the bottom expansion step, the side wall of the impact bullet head 601 and the inner wall of the rigid pile body 101 are sealed by a sealing ring. The head of the impact bullet head 601 is conical and is located at the lower end of the impact bullet head 601.

[0068] In this embodiment, all the extension wings 602 are first rotated to the expanded state, and then the impact bullet head 601 is stuffed upward from the bottom end of the rigid pile body 101 to the bottom of the first through hole 102. During the stuffing, the side wall of the impact bullet head 601 and the side wall inside the first through hole 102 are sealed by a sealing ring, and the head of the impact bullet head 601 is located at the lower end of the impact bullet head 601. After that, all the extension wings 602 are rotated to the undeployed state, and then all the steel bars 603 are tied together with wire to temporarily fix all the extension wings 602 to the undeployed state, waiting for subsequent operations.

[0069] According to the present invention, after the impact bullet head 601 is filled, the head of the impact bullet head 601 is located at the lower end of the impact bullet head 601. The head of the impact bullet head 601 is conical, so that when the inner hammer 704 hammers the impact bullet head 601, the impact bullet head 601 pushes the extension wing 602 to unfold and rotates with the conical head of the impact bullet head 601 in contact with the extension wing 602. That is, the force point of the extension wing 602 is at a long distance from the rotation axis of the extension wing 602, so that the impact bullet head 601 can smoothly push the extension wing 602 to rotate with a small force when pushing the extension wing 602 to rotate, and the structural design is ingenious.

[0070] See also Figure 2 、 Figure 6 、 Figure 7 and Figure 8 In the bottom expansion step, the hammer limiting device includes a mounting block 701, a spring, a sliding block 703, an inner hammer 704, a connecting rope 705 and a hammer lifting block 706; The mounting block 701 is fixedly mounted on the upper end surface of the rigid pile body 101. The upper and lower end surfaces of the mounting block 701 are penetrated by a second through hole 202. The cross section of the second through hole 202 is the same as that of the first through hole 102, and the second through hole 202 is connected to the first through hole 102. The manner in which the mounting block 701 is mounted on the upper end surface of the rigid pile body 101 is not limited here, and may be welded or connected by bolts; The mounting block 701 has a plurality of springs arranged in a circular array along the center line of the rigid pile body 101. The lower end surfaces of the plurality of springs are fixedly connected to the upper end surface of the mounting block 701. The lower end surface of the sliding block 703 is provided with a groove 708. The upper end surfaces of the plurality of springs are fixedly connected to the upper end surface of the groove 708. The mounting block 701 is located in the groove 708. The sliding direction of the sliding block 703 is consistent with the expansion and contraction direction of the springs. The upper and lower end surfaces of the sliding block 703 are penetrated by third through holes 707 . The cross section of the third through hole 707 is the same as the cross section of the second through hole 202 , and the third through hole 707 is connected to the second through hole 202 . One end of the connecting rope 705 is fixedly connected to the upper end surface of the inner hammer 704, and the other end of the connecting rope 705 is fixedly connected to the lower end surface of the hammer lifting block 706. When the inner hammer 704 strikes the impact bullet head 601 in the rigid pile body 101, the hammer lifting block 706 contacts the upper end surface of the pressing sliding block 703.

[0071] In this embodiment, all the extension wings 602 are first rotated to the extended state, and then the impact bullet head 601 is stuffed upward from the bottom end of the rigid pile body 101 to the bottom of the first through hole 102. During the stuffing, the side wall of the impact bullet head 601 and the side wall inside the first through hole 102 are sealed by a sealing ring, and the head of the impact bullet head 601 is located at the lower end of the impact bullet head 601. Then, all the extension wings 602 are rotated to the undeployed state, and then all the steel bars 603 are tied together with iron wire to temporarily fix all the extension wings 602 to the undeployed state. The support wings 201 are temporarily fixed to the state when the support wings 201 are not extended by the iron sheet, that is, a part of the iron sheet is bonded to the outer wall of the prefabricated hollow rigid pile, and the other part of the iron sheet is bonded to the support wings 2 01, then a hole is opened on the ground and slurry is injected into the hole, and then the rigid pile body 101 with the support wings 201 and the extension wings 602 temporarily fixed is placed in the hole, and first all the support wings 201 are pushed toward the outer wall of the rigid pile body 101 from top to bottom by the support wing extension device, and then the support wing extension device is taken out, and then the inner hammer 704 is driven by the hammer block 706 to extend into the fourth through hole 709, the third through hole 707 and the first through hole 102 in turn, and then the impact bullet head 601 is repeatedly hammered. After the extension wings 602 stretch the wire, the extension wings 602 continue to be unfolded toward the outer wall of the rigid pile body 101 to form an expanded bottom. After the hammering is completed, the inner hammer 704 is taken out, and the impact bullet head 601 remains between the extension wings 602 to jam the extension wings 602 to prevent it from rotating.

[0072] The inner hammer 704 of the present invention remains in the first through hole 102 after hammering the impact bullet head 601 and stretching the extending wings 602. After the extending wings 602 form an expanded bottom, the side walls of the impact bullet head 601 are still sealed with the side walls inside the first through hole 102, so that the slurry will not flow into the first through hole 102 from the bottom of the rigid pile body 101. In addition, the impact bullet head 601 can keep the extending wings 602 in the expanded state to form an expanded bottom, and the extending wings 602 will not rotate to the undeployed state. The structural design is ingenious.

[0073] See also Figure 2 and Figure 7 , the cross section of the inner hammer 704 is smaller than the cross section of the first through hole 102 .

[0074] In this embodiment, when the inner hammer 704 is driven by the hammer block 706 to repeatedly hammer the impact bullet head 601, since the cross section of the inner hammer 704 is smaller than the cross section of the first through hole 102, the inner hammer 704 can freely fall to hammer the impact bullet head 601.

[0075] When the inner hammer 704 strikes the impact bullet head 601 , the inner hammer 704 can strike the impact bullet head 601 in free fall, thereby ensuring that the inner hammer 704 smoothly strikes the impact bullet head 601 to a state where the extension wings 602 are unfolded.

[0076] See also Figure 6 When the lifting hammer block 706 contacts and presses the sliding block 703 , the outer side wall of the lifting hammer block 706 is flush with the outer side wall of the sliding block 703 .

[0077] In this embodiment, when the inner hammer 704 is driven by the hammer block 706 to repeatedly hammer the impact bullet head 601, the hammer block 706 is blocked by the upper end surface of the sliding block 703 when it is lowered to the upper end surface of the sliding block 703, so that the hammer block 706 contacts and presses the sliding block 703.

[0078] When the hammer block 706 of the present invention is lowered to the upper end surface of the sliding block 703, the outer side wall of the hammer block 706 is placed down to be flush with the outer side wall of the sliding block 703, so that the sliding block 703 can support the hammer block 706 and prevent it from continuing to descend into the first through hole 102, thereby ensuring that the hammer block 706 can be repeatedly lifted and lowered to drive the inner hammer 704 to hammer the impact bullet head 601 through the connecting rope 705.

[0079] See also Figure 6 、 Figure 7 、 Figure 8 、 Figure 9 and Figure 11When the inner hammer 704 hammers the extending wing 602 to the expanded state, the upper end surface of the groove 708 fits into the upper end surface of the mounting block 701, and the lower end surface of the sliding block 703 is flush with the lower end surface of the mounting block 701. The distance from the upper end surface of the impact bullet head 601 to the upper end surface of the sliding block 703 is a, the length of the connecting rope 705 is b, and the height of the inner hammer 704 is c, a=b+c.

[0080] In this embodiment, a hole is drilled on the ground, and slurry is injected into the hole, and the impact bullet head 601 is filled from the bottom end of the rigid pile body 101 to the bottom of the first through hole 102. After that, the rigid pile body 101 with the temporarily closed support wings 201 and extension wings 602 is placed in the hole, and the support wings 201 are pushed out from top to bottom toward the outer wall of the rigid pile body 101 by the support wing expansion device. Then, the support wing expansion device is taken out, and the inner hammer 704 is driven by the hammer block 706 to repeatedly hammer the impact bullet head 601. Before the inner hammer 704 hammers the extension wings 602 to the expanded state, the impact bullet head 601 has not dropped to the specified position, and the connecting rope 705 is not completely straightened when the lower end face of the inner hammer 704 contacts the upper end face of the impact bullet head 601. At this time, the lower end face of the sliding block 703 is higher than the lower end face of the mounting block 701. When the lower end surface of the sliding block 703 is observed to be flush with the lower end surface of the mounting block 701, the impact bullet head 601 drops to the specified position, the connecting rope 705 is just completely straightened, and the second spring 702 is compressed under the combined gravity of the hammer block 706, the connecting rope 705 and the inner hammer 704 until the lower end surface of the sliding block 703 is kept flush with the lower end surface of the mounting block 701, indicating that the inner hammer 704 has hammered the extending wing 602 to the deployed state. At this time, the impact bullet head 601 is stuck between the several extending wings 602 and closes the lower end surface of the first through hole 102. When it is observed that the lower end surface of the sliding block 703 is flush with the lower end surface of the mounting block 701, the connecting rope 705 and the inner hammer 704 are lifted out of the rigid pile body 101 by lifting the hammer block 706, thereby completing the bottom expansion work of the extending wing 602.

[0081] The inner hammer 704 of the present application is not completely straightened when the connecting rope 705 contacts the upper end surface of the impact bullet head 601 at the lower end surface of the inner hammer 704 before the impact bullet head 601 expands the stretch wing 602 to the unfolded state, at this time the force on the second spring 702 is the weight of the lifting hammer block 706 and the connecting rope 705, the lower end surface of the sliding block 703 is higher than the lower end surface of the mounting block 701 under the support of the second spring 702, the connecting rope 705 is just completely straightened in the first through hole 102 when the inner hammer 704 hammers the impact bullet head 601 to expand the stretch wing 602 to the unfolded state, the second spring 702 is compressed under the combined weight of the lifting hammer block 706, the connecting rope 705 and the inner hammer 704 to keep the lower end surface of the sliding block 703 flush with the lower end surface of the mounting block 701, so that whether the stretch wing 602 is hammered to the unfolded state can be judged by observing whether the lower end surface of the sliding block 703 is flush with the lower end surface of the mounting block 701 during the process of the inner hammer 704 hammering the impact bullet head 601, and the structure is cleverly matched.

[0082] The above embodiments only exemplarily illustrate the principles and effects of the present application, and are not used to limit the present application. Any person skilled in the art can modify or change the above embodiments without departing from the spirit and scope of the present application. Therefore, all equivalent modifications or changes completed by those skilled in the art without departing from the spirit and technical thought disclosed by the present application should be covered by the claims of the present application.

Claims

1. A construction method for prefabricated hollow rigid piles with inner and outer wings, characterized by: The prefabricated hollow rigid pile construction method comprises: Hole-making steps: Drill a hole in the ground and inject slurry into the hole; Piling steps: Place the prefabricated hollow rigid pile in the hole, wrap the prefabricated hollow rigid pile on the outside with slurry, and keep the hollow part of the prefabricated hollow rigid pile dry; Expansion steps: lower the wing extension device from the prefabricated hollow rigid pile to the wing at the uppermost position. The uppermost wing will prevent the wing extension device from continuing to be lowered. At this time, turn on the wing extension device, and the wing extension device pushes the wing to push it toward the outer wall of the prefabricated hollow rigid pile. Then the wing extension device continues to be lowered, and the above steps are repeated from top to bottom to push the wing toward the outer wall of the prefabricated hollow rigid pile.

2. A construction method for prefabricated hollow rigid piles with inner and outer wings according to claim 1, characterized in that: In the piling step, the prefabricated hollow rigid piles include: A rigid pile body, wherein the upper and lower end surfaces of the rigid pile body are penetrated by first through holes; A plurality of expansion units, wherein the expansion units are arrayed along the axial direction of the rigid pile body, each of the expansion units includes a plurality of expansion modules, and the expansion modules are arranged in a circular array along the center line of the rigid pile body, each of the expansion modules includes a wing and a second through hole, the second through hole is provided on the rigid pile body, and the second through hole passes through the inner and outer side walls of the rigid pile body, the wing is fan-shaped, the wing is rotatably mounted in the second through hole, the rotation axis of the wing is perpendicular to the center line of the rigid pile body, and the rotation axis of the wing is located in the second through hole; When the wing is not unfolded, part of the wing is located in the rigid pile body; During the process of the wing rotating to the expanded state, the wing continues to close the second through hole, and a part of the wing is located outside the rigid pile body.

3. The construction method of a prefabricated hollow rigid pile with inner and outer wings according to claim 2, characterized in that: The upper end surface of the wing is arc-shaped, and the central axis of the upper end surface of the wing coincides with the rotation axis of the wing; The upper end surface of the second through hole is in contact with the upper end surface of the wing.

4. The construction method of a prefabricated hollow rigid pile with inner and outer wings according to claim 3, characterized in that: The expansion module also includes a mounting slot, a first spring, a limit block and a limit slot; The mounting groove is formed on the lower end surface of the second through hole, one end of the first spring is fixedly connected to the lower end of the mounting groove, and the other end of the first spring is fixedly connected to the limit block, and the expansion and contraction direction of the first spring is consistent with the axial direction of the mounting groove; The rotation axis of the wing is located at the upper part of the second through hole, and a limiting groove is provided on the lower end surface of the wing. When the wing rotates to the unfolded state in the second through hole, the limiting block extends into the limiting groove under the action of the first spring.

5. The construction method of a prefabricated hollow rigid pile with inner and outer wings according to claim 2, characterized in that: The lower end surface of the second through hole is an arc-shaped surface; The lower end surface of the second through hole is in contact with the lower end surface of the wing.

6. The construction method of a prefabricated hollow rigid pile with inner and outer wings according to claim 2, characterized in that: When the wing is not unfolded, the maximum distance the wing extends into the first through hole is z; The cross section of the first through hole is square, and one end surface of the wing is in contact with one side wall of the square first through hole; The side wall of the square first through hole that is in contact with the wing is the first side wall, and the side wall of the square first through hole that is parallel to the first side wall is the second side wall; The distance between the other end surface of the wing and the second side wall is greater than or equal to z.

7. The construction method of a prefabricated hollow rigid pile with inner and outer wings according to claim 1, characterized in that: In the pile-installing step, before the prefabricated hollow rigid pile is placed in the hole, the bottom of the prefabricated hollow rigid pile is sealed.

8. The construction method of a prefabricated hollow rigid pile with inner and outer wings according to claim 2, characterized in that: In the expansion step, the wing expansion device includes a first mounting frame, a second mounting frame, a telescopic power source and a plurality of articulated modules; The fixed end of the telescopic power source is fixedly mounted on the first mounting frame, and the extended end of the telescopic power source is fixedly mounted on the second mounting frame, and the first mounting frame is located above the second mounting frame; When the wing expansion device is placed in the rigid pile body, the axial direction of the telescopic power source coincides with the center line of the rigid pile body; Several of the articulated modules are arranged in a circular array along the axial direction of the telescopic power source, and each of the articulated modules includes a first rotating block and a second rotating block. One end of the first rotating block is hinged to the first mounting frame, the other end of the first rotating block is hinged to one end of the second rotating block, and the other end of the second rotating block is hinged to the second mounting frame. Under the action of the telescopic power source, the first rotating block and the second rotating block push the support wings toward the outer wall of the rigid pile body.

9. The construction method of a prefabricated hollow rigid pile with inner and outer wings according to claim 8, characterized in that: The wing expansion device also includes a transverse limiting rod; The transverse limiting rod is fixedly mounted on the upper end surface of the first mounting frame, the length direction of the transverse limiting rod is perpendicular to the axial direction of the telescopic power source, and the length of the transverse limiting rod is the same as the length of the diagonal of the first through hole; When the wing expansion device is placed in the rigid pile body, both ends of the transverse limiting rod in the length direction have mutually perpendicular surfaces, and the mutually perpendicular surfaces at both ends of the transverse limiting rod in the length direction are in contact with the two adjacent side walls of the first through hole.

10. The construction method of a prefabricated hollow rigid pile with inner and outer wings according to claim 9, characterized in that: The wing expansion device also includes a vertical limiting rod; The lower end of the vertical limiting rod is fixedly mounted on one end of the transverse limiting rod in the length direction, and the length direction of the vertical limiting rod is perpendicular to the length direction of the transverse limiting rod; When the wing expansion device is placed in the rigid pile body, two side walls of the vertical limiting rod are in contact with two adjacent side walls of the first through hole.

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