A method for constructing a civil foundation pile

Abstract

This invention discloses a construction method for civil engineering foundation piles, aiming to provide a method with strong stability, simple construction, high practicality, and significantly improved reinforcement effect on foundation piles. The key technical point is that this invention employs a combination of steel pipe columns and column sheaths, changing the traditional method of using only steel pipe columns. By first partially screwing the column sheath below ground level and excavating the soil inside the sheath before attaching it to the steel pipe column, protection and support for the steel pipe column are achieved, forming a strong reinforcement effect. Furthermore, partially screwing it below ground level increases subsequent operating space, and the excavation of the soil facilitates stable screwing, preventing the column sheath from tipping over and affecting the installation of the steel pipe column. This invention is applicable to the field of civil engineering construction technology.

Description

Technical Field

[0001] This invention relates to the field of civil engineering construction technology, and more specifically, to a method for constructing civil engineering foundation piles. Background Technology

[0002] Drilled piles are a common type of foundation and are indispensable in almost all civil engineering projects, including bridge engineering, building engineering, and dock engineering. They provide excellent vertical bearing capacity, but their horizontal bearing capacity is very poor.

[0003] For foundations that generally require high horizontal bearing capacity, such as bridge piers, impact piers, and arch bridge pier foundations, bored pile groups are almost always used. During the pouring process, due to the staged pouring, the piles may tilt at the end of the pouring, thus affecting the overall strength of the foundation piles. Summary of the Invention

[0004] In view of the shortcomings of the existing technology, the purpose of this invention is to provide a civil engineering foundation pile construction method that is highly stable, simple to construct, highly practical, and greatly improves the strengthening effect of foundation piles.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a method for constructing civil foundation piles, specifically including the following steps: S1, preparing steel pipe columns and column sheaths, first screwing the column sheaths halfway into the ground and excavating the soil inside the column sheaths;

[0006] S2. Next, lower the steel pipe column below ground level along the inner wall of the column sleeve, and press the steel pipe column completely below ground level, keeping the column sleeve in its original position for subsequent construction.

[0007] S3. Drill holes downwards through steel pipe columns to form the grouting pile holes for bored piles. Mud slurry is used to protect the wall during the drilling process.

[0008] S4. Several sections of protective sleeve are placed into the grouting pile hole. The sections of protective sleeve are fixed together by a snap-fit ​​structure to form a support for the grouting pile hole.

[0009] S5. Through the steel pipe column, ensure that the steel cage and the retaining sleeve are on the same axis. The steel cage extends upward from the bottom of the cast-in-place pile hole to the bottom section inside the steel pipe column. Then, pour concrete into the cast-in-place pile hole and the bottom section of the steel pipe column. The poured concrete covers the cage section of the steel cage inside the steel pipe column. After the last pouring of concrete, a bored cast-in-place pile is formed.

[0010] S6. Then screw the post sleeve completely into the ground and gradually compact the soil around the post sleeve.

[0011] S7. Pour concrete into the steel pipe column, and after the next concrete pour, a steel pipe concrete column will be formed.

[0012] S8. After the concrete has solidified, unscrew the column sleeve and remove the steel pipe column to complete the processing.

[0013] The present invention is further configured such that: the column sleeve includes an outer spiral sleeve, an inner spiral sleeve, and a support sleeve arranged sequentially from the outside to the inside; the outer spiral sleeve includes an external thread, an external snap fastener, and an outer sleeve end face; the outer sleeve end face and the external snap fastener are located at the upper end and lower end of the external thread, respectively; the external thread decreases in size from the upper outer sleeve end face to the lower external snap fastener; the outer spiral sleeve also has an axial through hole and several slots; each slot is provided on the external thread and the external snap fastener; the slots connect the axial through hole and the radially outer side of the outer spiral sleeve, so that the external snap fastener has several snap fastener portions.

[0014] The present invention is further configured such that: the inner rotating sleeve body includes a plurality of inner rotating sleeve body parts, each inner rotating sleeve body part including an inner rotating sleeve body block and a guide plate, the inner rotating sleeve body block being disposed at the lower end of the guide plate; an inner groove is provided on the inner side of the guide plate, and an inner slot is provided on the inner rotating sleeve body block, the inner slot being located on the outer side of the guide plate; the guide plate is inserted into the axial through hole, and the buckling part is inserted into the inner slot.

[0015] The present invention is further configured such that: the support sleeve includes an inner main sleeve and an annular protrusion disposed on the inner main sleeve; the support sleeve is inserted between an axial through hole and several guide plates; the diameter of the inner main sleeve is greater than or equal to the diameter of the vertical through hole defined by the four guide plates; the annular protrusion is inserted into several inner grooves; the axial through hole includes a tapered hole section penetrating the lower end of the outer rotating sleeve; the inner diameter of the tapered hole section decreases along the installation direction to provide space between the axial through hole and the guide plates; an internal thread is provided on the outer surface of the guide plates; the outer surface of the guide plates includes a decreasing surface that decreases from bottom to top; an internal thread is provided on the decreasing surface; after the inner groove and the outer buckle are engaged, the outer peripheral surface of the inner rotating sleeve block and the bottom surface of the external thread are on the same plane.

[0016] The invention is further configured such that: the outer surface of the guide plate also includes a cylindrical surface connected to the upper end of the decreasing surface; the axial through hole is a stepped hole, and the upper end of the axial through hole is larger than the lower end; the support sleeve also includes an extension sleeve disposed on the upper end of the locking post; the extension sleeve is fixed to the end face of the outer sleeve by bolts; the extension sleeve is installed on the upper end of the axial through hole; the extension sleeve is provided with a part-removing hook hole, the part-removing hook hole is arc-shaped, and both ends of the part-removing hook hole penetrate through the upper surface of the extension sleeve.

[0017] The present invention is further configured such that: the outer buckle includes a decreasing portion connected to the lower end of the external thread, and an upper insertion protrusion protruding outward from the lower end of the decreasing portion; the inner slot includes an upward-facing slot, and a lower insertion protrusion disposed on the outer sidewall of the slot, the decreasing portion is inserted into the slot, and the upper insertion protrusion is located below the lower insertion protrusion.

[0018] The present invention is further configured such that: the protective sleeve includes an upper assembly and a lower assembly on the side away from the upper assembly; both the upper and lower assemblies are fitted with an inner tube and splicing pieces evenly installed between the upper and lower assemblies and distributed along the periphery of the inner tube; one side of the upper assembly is evenly provided with an installation groove; an insertion block is placed inside the installation groove; an empty slot is opened inside the insertion block; a locking block is installed inside the empty slot; and the lower assembly is provided with a rod that matches the empty slot.

[0019] The invention is further configured such that: the end face of the outer rotating sleeve is provided with an insertion hole for use with a rotating device to press the outer rotating sleeve into the ground.

[0020] By adopting the above technical solution, the following beneficial effects are achieved: 1. In this invention, the cooperation between the steel pipe column and the column sleeve is adopted, which changes the traditional method of only using the steel pipe column. By first screwing the column sleeve halfway into the ground and excavating the soil inside the column sleeve before cooperating with the steel pipe column, the steel pipe column is protected and the support of the steel pipe column is improved, forming a strong reinforcement and protection effect. Moreover, after screwing halfway into the ground, the subsequent operation space is increased. Excavating the soil first also facilitates the stability of subsequent screwing in and avoids the phenomenon of the column sleeve tilting over, which would affect the installation of the steel pipe column.

[0021] Furthermore, the process involves drilling downwards through steel pipe columns to form the bored pile hole, with mud slurry used for wall protection during drilling. Several sections of protective sleeves are placed into the bored pile hole, and these sleeves are fixed together using a snap-fit ​​structure, providing support for the bored pile hole. This improves the integration effect between the concrete and the protective sleeves after concrete pouring, resulting in strong stability, a simple structure, and ensuring that the reinforcing cage and the protective sleeves are on the same axis. The reinforcing cage extends upwards from the bottom of the bored pile hole to the bottom section inside the steel pipe column. Concrete is then poured into the bored pile hole and the bottom section of the steel pipe column, covering the section of the reinforcing cage inside the column. After the concrete pouring, the bored pile is formed, improving the integration effect between the concrete and the reinforcing cage, and enhancing its practicality.

[0022] 2. To improve the overall structural strength of the column sleeve, the column sleeve is designed to include an outer spiral sleeve, an inner spiral sleeve, and a support sleeve arranged sequentially from the outside in. The inner and outer spiral sleeves are paired with the support sleeve, forming an integrated structure. The outer spiral sleeve includes an external thread, an external snap-fit, and an outer sleeve end face. The outer sleeve end face and the external snap-fit ​​are located at the upper and lower ends of the external thread, respectively. The external thread decreases in size from the upper outer sleeve end face to the lower external snap-fit. This is because the shape of the external thread is determined... The restriction creates an effect that gradually compacts the surrounding soil, continuously improving the compactness of the column sleeve and the ground. The outer rotating sleeve also has an axial through hole and several slots. Each slot is set on the external thread and the external buckle. The slot connects the axial through hole and the radial outside of the outer rotating sleeve, so that the external buckle has several buckling parts. The above structure makes it easy to form a fixed limiting effect between the outer rotating sleeve and the inner rotating sleeve, improving the integrity of the outer rotating sleeve, the inner rotating sleeve and the support sleeve. It has strong stability and a simple structure.

[0023] 3. To ensure an integrated effect during pouring, the protective sleeve is designed to include an upper assembly and a lower assembly on the side away from the upper assembly. Both the upper and lower assemblies have an inner tube body fitted inside, along with splicing pieces evenly distributed between the upper and lower assemblies and along the periphery of the inner tube body. The inner tube body and splicing pieces, fixed by the upper and lower assemblies, form a strong reinforcing effect. During pouring, even with increasing pressure, concrete overflow will not occur, thus achieving a compaction effect between the concrete and the reinforcing cage. This design offers high compactness, high integrated strength, strong practicality, and a simple structure. The upper assembly has evenly spaced installation grooves on one side, each containing an insertion block. The insertion blocks have internal slots, each containing a locking block. This structural design, through the installation grooves, insertion blocks, and locking blocks, facilitates easy connection between adjacent protective sleeves, resulting in a simple and practical structure.

[0024] 4. In this invention, by using a column sleeve in conjunction with the pile body, a stable and compact effect is achieved even when the pile body is unstable after pouring, greatly reducing the difficulty of construction. At the same time, relying on the special structure of the column sleeve, the soil around the column sleeve can be compacted when the column sleeve is screwed into the ground, further improving the fastening effect of the column sleeve and greatly ensuring the stability during subsequent pouring. The structure is simple and highly practical. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the construction structure of an embodiment of a civil engineering foundation pile construction method according to the present invention.

[0026] Figure 2This is an embodiment of a civil engineering foundation pile construction method according to the present invention. Figure 1 Enlarged schematic diagram of the structure at point A in the middle.

[0027] Figure 3 This is a schematic diagram of the protective sleeve structure of an embodiment of a civil engineering foundation pile construction method according to the present invention.

[0028] The attached figures are labeled as follows: 1. Steel pipe column; 2. Column sleeve; 20. Outer sleeve; 201. External thread; 202. Outer sleeve end face; 203. Axial through hole; 204. Slot; 21. Inner sleeve; 210. Inner sleeve part; 211. Inner sleeve stop block; 212. Guide plate; 213. Inner groove; 214. Inner slot; 22. Support sleeve; 220. Inner main sleeve; 2 21. Annular protrusion; 222. Extension sleeve; 223. Decreasing section; 224. Upper insertion protrusion; 225. Slot; 226. Lower insertion protrusion; 3. Cast-in-place pile hole; 4. Reinforcing cage; 5. Protective sleeve; 50. Upper assembly; 51. Lower assembly; 52. Inner tube; 53. Splice; 54. Mounting groove; 55. Insertion block; 56. Empty groove; 57. Locking block; 58. Insert rod. Detailed Implementation

[0029] Reference Figures 1 to 3 The present invention provides a further description of an embodiment of a civil engineering foundation pile construction method.

[0030] For ease of explanation, spatial relative terms such as “up,” “down,” “left,” and “right” are used in the embodiments to describe the relationship of one element or feature shown in the figures relative to another element or feature. It should be understood that, in addition to the orientations shown in the figures, spatial terms are intended to include different orientations of the device in use or operation. For example, if the device in the figures is inverted, an element described as being “down” of other elements or features would be positioned “up” of those other elements or features. Therefore, the exemplary term “down” can encompass both up and down orientations. The device may be positioned in other ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0031] Moreover, relational terms such as “first” and “second” are used merely to distinguish one component from another that has the same name, without necessarily requiring or implying any such actual relationship or order between the components.

[0032] A method for constructing civil engineering foundation piles includes the following steps: S1, preparing steel pipe columns 1 and column sleeves 2, first screwing the column sleeves 2 halfway into the ground and excavating the soil inside the column sleeves 2; in this step, by first screwing the column sleeves 2 halfway into the ground, the purpose is to reduce the resistance when screwing the column sleeves 2 in and to achieve the effect of gradually compacting the column sleeves 2, which greatly improves the overall stability;

[0033] S2. Then, lower the steel pipe column 1 along the inner wall of the column sleeve 2 below the ground and press the steel pipe column 1 completely below the ground, keeping the column sleeve 2 in its original position for subsequent construction.

[0034] In this step, the column sleeve 2 and the steel pipe column 1 are installed in sequence. When installing the steel pipe column 1, the column sleeve 2 can be used as a guide to facilitate subsequent operations. At this time, the soil inside the steel pipe column 1 needs to be excavated again.

[0035] S3. Drill a hole downward through the steel pipe column 1 to form the grouting pile hole 3 of the bored pile. Mud slurry is used to protect the wall during the drilling process.

[0036] S4. Several sections of protective sleeve 5 are placed into the grouting pile hole 3. The sections of protective sleeve 5 are fixed together by a snap-fit ​​structure to form a support for the grouting pile hole 3.

[0037] By using the above method, the protective sleeve 5 is placed into the grouting pile hole 3, which makes the concrete more compacted and achieves a better compaction effect.

[0038] S5. Lower the reinforcing cage 4 through the steel pipe column 1, ensuring that the reinforcing cage 4 and the retaining sleeve 5 are on the same axis. The reinforcing cage 4 extends upward from the bottom of the cast-in-place pile hole 3 to the bottom section inside the steel pipe column 1. Then, pour concrete into the cast-in-place pile hole 3 and the bottom section of the steel pipe column 1. The poured concrete covers the cage section of the reinforcing cage 4 inside the steel pipe column 1. After the last pouring of concrete, a bored cast-in-place pile is formed.

[0039] S6. Then, screw the column sleeve 2 completely into the ground and gradually compact the soil around the column sleeve 2. Screwing the column sleeve 2 into the ground in stages can effectively change the compaction effect of the ground around the pile body through the column sleeve 2, forming a stronger load-bearing capacity, greatly improving the overall construction convenience, practicality, and simple structure.

[0040] S7. Pour concrete into the steel pipe column 1, and a steel pipe concrete column will be formed after the next concrete pouring.

[0041] S8. After the concrete has hardened, unscrew the column sleeve 2 and remove the steel pipe column 1 to complete the processing.

[0042] In this invention, a combination of steel pipe column 1 and column sleeve 2 is used, which changes the traditional method of using only steel pipe column 1. By first screwing the column sleeve 2 halfway into the ground and excavating the soil inside the column sleeve 2 before fitting it with the steel pipe column 1, the steel pipe column 1 is protected and its support is improved, forming a strong reinforcement and protection effect. Furthermore, screwing it halfway into the ground also increases the subsequent operating space. Excavating the soil first also facilitates the stability of the subsequent screwing in, preventing the column sleeve 2 from tilting and affecting the installation of the steel pipe column 1.

[0043] Furthermore, a hole 3 for the bored pile is formed by drilling downwards through the steel pipe column 1, with mud slurry used for wall protection during the drilling process. Several sections of wall protection sleeves 5 are placed into the bored pile hole 3, and the sections of wall protection sleeves 5 are fixed together by a snap-fit ​​structure, forming a support for the bored pile hole 3. This improves the integration effect between the concrete and the wall protection sleeves 5 after the concrete is poured, resulting in strong stability, simple structure, and ensuring that the reinforcing cage 4 and the wall protection sleeves 5 are on the same axis. The reinforcing cage 4 extends upwards from the bottom of the bored pile hole 3 to the bottom section inside the steel pipe column 1. Then, concrete is poured into the bored pile hole 3 and the bottom section of the steel pipe column 1, and the poured concrete covers the section of the reinforcing cage 4 that enters the steel pipe column 1. After the last pouring of concrete, the bored pile is formed, improving the integration effect between the concrete and the reinforcing cage 4, and making it highly practical.

[0044] The present invention is further configured such that the column sleeve 2 includes an outer spiral sleeve 20, an inner spiral sleeve 21, and a support sleeve 22 arranged sequentially from the outside to the inside. The outer spiral sleeve 20 includes an external thread 201, an external buckle, and an outer sleeve end face 202. The outer sleeve end face 202 and the external buckle are located at the upper end and lower end of the external thread 201, respectively. The external thread 201 decreases in size from the upper outer sleeve end face 202 to the lower external buckle. The outer spiral sleeve 20 also has an axial through hole 203 and several slots 204. Each slot 204 is provided on the external thread 201 and the external buckle. The slots 204 connect the axial through hole 203 and the radially outer side of the outer spiral sleeve 20, so that the external buckle has several buckling parts.

[0045] To improve the overall structural strength of the column sleeve 2, the column sleeve 2 is configured to include an outer spiral sleeve 20, an inner spiral sleeve 21, and a support sleeve 22 arranged sequentially from the outside in. The inner and outer spiral sleeves 20 are paired with the support sleeve 22, forming an integrated structure between the inner spiral sleeve 21 and the outer spiral sleeve 20. The outer spiral sleeve 20 includes an external thread 201, an external snap-fit, and an outer sleeve end face 202. The outer sleeve end face 202 and the external snap-fit ​​are located at the upper and lower ends of the external thread 201, respectively. The external thread 201 decreases in size from the upper outer sleeve end face 202 to the lower external snap-fit. This is because the external thread 201 is shaped... The shape of the restriction creates an effect that gradually compacts the surrounding soil, continuously improving the compactness of the column sleeve 2 and the ground. The outer rotating sleeve 20 also has an axial through hole 203 and several slots 204. Each slot 204 is set on the external thread 201 and the external buckle. The slot 204 connects the axial through hole 203 and the radial outer side of the outer rotating sleeve 20, so that the external buckle has several buckling parts. The above structure facilitates the formation of a fixed limiting effect between the outer rotating sleeve 20 and the inner rotating sleeve 21, improving the integrity of the three parts: the outer rotating sleeve 20, the inner rotating sleeve 21 and the support sleeve 22. It has strong stability and a simple structure.

[0046] The present invention is further configured such that the inner rotating sleeve 21 includes a plurality of inner rotating sleeve 21 parts, each inner rotating sleeve 21 part including an inner rotating sleeve 21 stop block and a guide plate 212, the inner rotating sleeve 21 stop block being disposed at the lower end of the guide plate 212; an inner groove 213 is provided on the inner side of the guide plate 212, and an inner slot 214 is provided on the inner rotating sleeve 21 stop block, the inner slot 214 being located on the outer side of the guide plate 212; the guide plate 212 is inserted into the axial through hole 203, and the buckle part is inserted into the inner slot 214. By using a column sleeve 2 with three parts, the inner rotating sleeve 21 can be fixed by the cooperation between the outer rotating sleeve 20 and the support sleeve 22. At the same time, the inner rotating sleeve 21 will also form an inward expansion effect on the outer rotating sleeve 20 from the left and right sides of the support sleeve 22, thereby greatly improving the stability during construction. Moreover, the structure is simple, the stability is strong, and it avoids tilting, shaking or other unstable situations after construction.

[0047] The present invention is further configured such that the support sleeve 22 includes an inner main sleeve 220 and an annular protrusion 221 disposed on the inner main sleeve 220. The support sleeve 22 is inserted between the axial through hole 203 and a plurality of guide plates 212. The diameter of the inner main sleeve 220 is greater than or equal to the diameter of the vertical through hole defined by the four guide plates 212. The annular protrusion 221 is inserted into a plurality of inner grooves 213. In the above structure, the annular protrusion 221 disposed on the support sleeve 22 and the inner grooves 213 can form a strong fixing and limiting effect between the support sleeve 22 and the inner rotating sleeve 21, thereby greatly improving the integrity of the column sleeve 2, with strong stability and simple structure.

[0048] The axial through hole 203 includes a tapered hole section that penetrates the lower end of the outer rotating sleeve 20. The inner diameter of the tapered hole section decreases along the installation direction to create space between the axial through hole 203 and the guide plate 212, thereby effectively forming a support effect between the guide plate 212 and the support sleeve 22, forming a strong connection. The outer surface of the guide plate 212 is provided with an internal thread. The outer surface of the guide plate 212 includes a decreasing surface that decreases from bottom to top, and the decreasing surface is provided with an internal thread. After the inner groove 214 is engaged with the outer buckle, the outer peripheral surface of the inner rotating sleeve 21 block and the bottom surface of the external thread 201 are on the same plane. By adopting the above-mentioned structural setting and the double thread structure, the overall installation convenience is improved, and it can also adapt to the land conditions, reduce the bearing stress of the column sleeve 2, and has strong practicality and simple structure.

[0049] The invention is further configured such that the outer surface of the guide plate 212 also includes a cylindrical surface. By configuring the guide plate 212 as a cylindrical surface structure, the stability of the fit between it and the support sleeve 22 can be achieved while ensuring the guiding function, thus improving the ease of installation and achieving a bidirectional support effect. Connected to the upper end of the decreasing surface, the axial through hole 203 is a stepped hole, with the upper end of the axial through hole 203 being larger than the lower end. The support sleeve 22 also includes an extension sleeve 222 disposed at the upper end of the locking post, the extension sleeve 222 being secured by bolts. Fixed to the end face 202 of the outer sleeve, the extension sleeve 222 is installed at the upper end of the axial through hole 203. By connecting and fixing the extension sleeve 222 and the end face 202 of the outer sleeve, the overall stability and strength are improved. The structure is simple and practical. The extension sleeve 222 is provided with a part removal hook hole. The part removal hook hole is arc-shaped, and both ends of the part removal hook hole penetrate through the upper surface of the extension sleeve 222. By adopting the above structure, the convenience of removing the support sleeve 22 and disassembling the column sleeve 2 is improved. The structure is simple and practical.

[0050] The present invention is further configured such that the outer buckle includes a decreasing portion 223 connected to the lower end of the external thread 201 and an upper insertion protrusion 224 protruding outward from the lower end of the decreasing portion 223; the inner slot 214 includes an upward-facing slot 225 and a lower insertion protrusion 226 disposed on the outer sidewall of the slot 225. In the embodiment of the present invention, by using the above structure to connect the inner and outer rotating sleeves 20 to achieve an integrated connection structure, and with the decreasing portion 223 inserted into the slot 225 and the upper insertion protrusion 224 located on the lower side of the lower insertion protrusion 226, the double fixing effect formed between the two improves the firmness, stability, and practicality.

[0051] The invention is further configured such that the protective sleeve 5 includes an upper assembly 50 and a lower assembly 51 on the side away from the upper assembly 50. Both the upper assembly 50 and the lower assembly 51 have an inner tube 52 fitted inside, and splicing parts 53 evenly installed between the upper and lower assemblies 51 and distributed along the periphery of the inner tube 52. One side of the upper assembly 50 has evenly distributed mounting grooves 54, each mounting groove 54 containing an insertion block 55. Each insertion block 55 has an internal slot 56, and each internal slot 56 contains a locking block 57. To ensure a unified effect during casting, the protective sleeve 5 is configured to include an upper assembly 50 and a lower assembly 51 on the side away from the upper assembly 50. Both the upper assembly 50 and the lower assembly 51 have an inner tube 52 fitted inside, and splicing parts 53 evenly installed between the upper and lower assemblies 51. The splicing parts 53 distributed along the periphery of the inner tube 52, together with the upper and lower assemblies 51, form a strong reinforcing effect. During the pouring process, even as the pressure increases, concrete will not overflow, thus achieving a compaction effect between the concrete and the reinforcing cage 4. This results in high compactness, high integrated strength, strong practicality, and a simple structure. The upper assembly 50 has uniformly opened installation grooves 54 on one side, with insertion blocks 55 placed inside each groove. The insertion blocks 55 have empty slots 56 inside, and locking blocks 57 are installed inside each empty slot. With the above structure, the installation grooves 54, the insertion blocks 55, and the locking blocks, along with the insertion rods 58 on the lower assembly 51 that are compatible with the empty slots 56, facilitate the connection between adjacent protective sleeves 5. This results in a simple structure and strong practicality.

[0052] The invention is further configured such that an insertion hole is provided on the end face of the outer rotating sleeve 20 for use with a rotating device to press the outer rotating sleeve 20 into the ground. With the above-mentioned structural configuration, the insertion hole on the end face of the outer rotating sleeve 20 facilitates the screwing of the outer rotating sleeve 20 into the ground, thereby improving the overall ease of installation, enhancing practicality, and also facilitating subsequent processing.

[0053] In this embodiment of the invention, by using the column sleeve 2 in conjunction with the pile body, a stable and compact effect is achieved for the pile body in an unstable state after pouring, which greatly reduces the difficulty of construction. At the same time, relying on the special structure of the column sleeve 2, the soil around the column sleeve 2 can be compacted when the column sleeve 2 is screwed into the ground, which further improves the fastening effect of the column sleeve 2 and greatly ensures the stability during subsequent pouring. The structure is simple and highly practical.

[0054] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any ordinary changes and substitutions made by those skilled in the art within the scope of the technical solution of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for constructing civil foundation piles, characterized in that, Specifically, the steps are as follows: S1, prepare steel pipe columns (1) and column sleeves (2), first screw the column sleeves (2) halfway into the ground, and excavate the soil inside the column sleeves (2); S2. Then, lower the steel pipe column (1) below the ground along the inner wall of the column sleeve (2) and press the steel pipe column (1) completely below the ground, keeping the column sleeve (2) in its original position for subsequent construction. S3. Drill a hole downward through the steel pipe column (1) to form the grouting pile hole (3) of the bored pile. Mud slurry is used to protect the wall during the drilling process. S4. Place several sections of protective sleeve (5) into the grouting pile hole (3). Each section of protective sleeve (5) is fixed by a snap-fit ​​structure to form a support for the grouting pile hole (3). S5. The steel reinforcement cage (4) is lowered through the steel pipe column (1) to ensure that the steel reinforcement cage (4) and the retaining sleeve (5) are on the same axis. The steel reinforcement cage (4) extends upward from the bottom of the grouting pile hole (3) to the bottom section inside the steel pipe column (1). Then, concrete is poured into the grouting pile hole (3) and the bottom section of the steel pipe column (1). The poured concrete covers the cage section of the steel reinforcement cage (4) inside the steel pipe column (1). After the last concrete pouring, a bored pile is formed. S6. Then screw the post sleeve (2) completely into the ground and gradually compact the soil around the post sleeve (2). S7. Pour concrete into the steel pipe column (1), and after the next concrete pour, a steel pipe concrete column will be formed. S8. After the concrete has solidified, unscrew the column sleeve (2) and remove the steel pipe column (1) to complete the processing. The column sleeve (2) includes an outer rotating sleeve (20), an inner rotating sleeve (21), and a support sleeve (22) arranged sequentially from the outside to the inside. The outer rotating sleeve (20) includes an external thread (201), an external buckle, and an outer sleeve end face (202). The outer sleeve end face (202) and the external buckle are located at the upper and lower ends of the external thread (201), respectively. The external thread (201) decreases in length from the upper outer sleeve end face (202) to the lower external buckle. The outer rotating sleeve (20) also has It has an axial through hole (203) and several slots (204). Each slot (204) is provided on the external thread (201) and the external buckle. The slots (204) connect the axial through hole (203) and the radial outer side of the external rotating sleeve (20) so that the external buckle has several buckling parts. The internal rotating sleeve (21) includes several internal rotating sleeve (21) parts. Each internal rotating sleeve (21) part includes an internal rotating sleeve (21) stop and a guide plate (212). The internal rotating sleeve (21) stop is provided at the lower end of the guide plate (212). The inner side of the guide plate (212) is provided with an inner groove (213). The body (21) has an inner groove (214) on the stop block, which is located outside the guide plate (212). The guide plate (212) is inserted into the axial through hole (203), and the buckle is inserted into the inner groove (214). The support sleeve (22) includes an inner main sleeve (220) and an annular protrusion (221) on the inner main sleeve (220). The support sleeve (22) is inserted between the axial through hole (203) and several guide plates (212). The diameter of the inner main sleeve (220) is greater than or equal to the diameter of the vertical through hole defined by the four guide plates (212). The annular protrusion... (221) Insert into several inner grooves (213). The axial through hole (203) includes a tapered hole section that passes through the lower end of the outer rotating sleeve (20). The inner diameter of the tapered hole section decreases along the installation direction so that there is space between the axial through hole (203) and the guide plate (212). The outer surface of the guide plate (212) is provided with an internal thread. The outer surface of the guide plate (212) includes a decreasing surface that decreases from bottom to top. The decreasing surface is provided with an internal thread. After the inner groove (214) is engaged with the outer buckle, the outer peripheral surface of the inner rotating sleeve (21) block and the bottom surface of the external thread (201) are on the same surface.

2. The method for constructing civil foundation piles according to claim 1, characterized in that, The outer surface of the guide plate (212) also includes a cylindrical surface connected to the upper end of the decreasing surface. The axial through hole (203) is a stepped hole, and the upper end of the axial through hole (203) is larger than the lower end. The support sleeve (22) also includes an extension sleeve (222) set at the upper end of the locking post. The extension sleeve (222) is fixed to the end face (202) of the outer sleeve by bolts. The extension sleeve (222) is installed at the upper end of the axial through hole (203). The extension sleeve (222) is provided with a part-removing hook hole. The part-removing hook hole is arc-shaped, and both ends of the part-removing hook hole penetrate the upper surface of the extension sleeve (222).

3. The method for constructing civil foundation piles according to claim 2, characterized in that, The external snap fastener includes a decreasing portion (223) connected to the lower end of the external thread (201) and an upper insertion protrusion (224) protruding outward from the lower end of the decreasing portion (223); the inner slot (214) includes an upward-opening slot (225) and a lower insertion protrusion (226) disposed on the outer sidewall of the slot (225), the decreasing portion (223) is inserted into the slot (225), and the upper insertion protrusion (224) is located below the lower insertion protrusion (226).

4. The method for constructing civil foundation piles according to claim 1, characterized in that, The protective sleeve (5) includes an upper assembly (50) and a lower assembly (51) on the side away from the upper assembly (50). The upper assembly (50) and the lower assembly (51) are both fitted with an inner tube body (52) and splicing pieces (53) evenly installed between the upper and lower assemblies (51) and distributed along the periphery of the inner tube body (52). The upper assembly (50) has a uniformly opened mounting groove (54) on one side. An insertion block (55) is placed inside the mounting groove (54). An empty groove (56) is opened inside the insertion block (55). A locking block (57) is installed inside the empty groove (56). The lower assembly (51) is provided with a plug rod (58) that matches the empty groove (56).

5. The method for constructing civil foundation piles according to claim 1, characterized in that, The outer rotating sleeve (20) has an insertion hole on its end face, which is used to cooperate with the rotating device to press the outer rotating sleeve (20) into the ground.

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