Precast pile and construction method

Abstract

The invention discloses a precast pile and a construction method, and relates to the technical field of building construction equipment. The precast pile comprises a precast pile body and an anti-pulling mechanism. At least one axial end of the precast pile body is provided with an anti-pulling mechanism, the anti-pulling mechanism comprises an anti-pulling assembly, and the anti-pulling assembly can be switched from a first position to a second position; when the anti-pulling assembly is located at the first position, the projection of the anti-pulling assembly towards the precast pile body in the axial direction of the precast pile body is completely located in the precast pile body; when the anti-pulling assembly is located at the second position, at least part of the projection of the anti-pulling assembly to the precast pile body in the axial direction of the precast pile body is located on the outer side of the precast pile body. According to the precast pile, when the precast pile bears upward pulling external force, the part, protruding out of the peripheral side face of the precast pile body, of the anti-pulling assembly is fixed by concrete, and the anti-pulling capacity can be effectively improved.

Description

Technical Field

[0001] The present invention relates to the technical field of building construction equipment, and more specifically, to a prefabricated pile. In addition, the present invention also provides a construction method applied to the prefabricated pile. Background Art

[0002] At present, foundation construction such as building bridges generally uses cylindrical cement pile groups as the ground foundation. The existing precast piles are generally cylindrical. When under pressure, the bottom of the pile can be pressed on the bearing layer to form support. When resisting pull-out, it can only rely on its own weight and the side friction formed with the soil in the circumferential direction.

[0003] Therefore, in the construction process, in most cases, when the bearing pressure just meets the requirements, the pull-out resistance of the precast piles generally does not meet the requirements. In order to improve the pull-out resistance, it is necessary to increase the number of precast piles or increase the diameter of the precast piles.

[0004] In summary, how to provide a prefabricated pile that can effectively improve the pull-out resistance is a problem that needs to be solved urgently by those skilled in the art. Summary of the invention

[0005] In view of this, the purpose of the present invention is to provide a precast pile. During actual use, by switching the anti-pull-out component to the second position, the anti-pull-out component can be arranged to protrude outward from the outer peripheral side of the convex precast pile body. After pouring concrete, the anti-pull-out ability of the precast pile can be effectively improved.

[0006] In addition, another object of the present invention is to provide a construction method applied to the above-mentioned precast piles.

[0007] In order to achieve the above object, the present invention provides the following technical solutions:

[0008] A prefabricated pile, comprising:

[0009] Precast pile body;

[0010] An anti-pullout mechanism, wherein at least one axial end of the precast pile body is provided with the anti-pullout mechanism, and the anti-pullout mechanism comprises an anti-pullout component, and the anti-pullout component can be switched from a first position to a second position;

[0011] When the anti-pullout assembly is located at the first position, the projection of the anti-pullout assembly along the axial direction of the precast pile body onto the precast pile body is completely located inside the precast pile body;

[0012] When the anti-pullout assembly is located at the second position, a projection of the anti-pullout assembly along the axial direction of the precast pile body onto the precast pile body is at least partially located outside the precast pile body.

[0013] Optionally, the anti-pullout mechanism comprises:

[0014] First base;

[0015] The anti-pulling assembly is provided with a first connecting rod and a second connecting rod, one end of the first connecting rod is hinged to the axial end of the precast pile body, the other end of the first connecting rod is hinged to one end of the second connecting rod, and the other end of the second connecting rod is hinged to the first base;

[0016] The first rotating shaft at the hinge between the first connecting rod and the precast pile body, the second rotating shaft at the hinge between the first connecting rod and the second connecting rod, and the third rotating shaft at the hinge between the second connecting rod and the first base are all perpendicular to the axial direction of the precast pile body.

[0017] Optionally, the anti-pullout mechanism further includes a locking assembly, and the locking assembly includes:

[0018] A first locking member, one end of which is connected to the axial end of the precast pile body;

[0019] A second locking member, one end of which is connected to the first base;

[0020] One of the other end of the first locking member and the other end of the second locking member is provided with a hook, and the other is provided with a slot engaged with the hook; when the anti-pullout component is located at the first position, the hook and the slot are in a released engagement state; when the anti-pullout component is located at the second position, the hook and the slot are in an engaged state.

[0021] Optionally, the anti-pullout mechanism further includes a first guide assembly, and the first guide assembly includes:

[0022] A first guide sleeve, one axial end of which is connected to the axial end of the precast pile body;

[0023] A second guide sleeve, one axial end of which is connected to a side of the first base facing the precast pile body; the first guide sleeve is sleevedly connected to the second guide sleeve, and the outer side wall of one of the first guide sleeve and the second guide sleeve is in contact with the inner side wall of the other; the first guide sleeve is axially movable relative to the second guide sleeve.

[0024] Optionally, at least one of the first connecting rod and the second connecting rod is provided with a positioning piece, and when the positioning piece contacts the outer side wall of the first guide assembly toward the side of the first guide assembly, a first distance between the first rotating shaft and the central axis of the precast pile body and a third distance between the third rotating shaft and the central axis of the precast pile body are both smaller than a second distance between the second rotating shaft and the central axis of the precast pile body.

[0025] Optionally, the anti-pullout mechanism further includes a second guide assembly, which includes a plurality of telescopic guide columns, which are arranged at intervals along the circumference of the precast pile body; one end of the telescopic guide column is connected to the axial end of the precast pile body, and the other end of the telescopic guide column is connected to the first base.

[0026] Optionally, the anti-pullout assembly includes a push structure and a plurality of translation structures, the precast pile body is provided with a central through hole, the outer peripheral side surface of the precast pile body is provided with a plurality of mounting holes penetrating the side wall along the circumferential direction, the translation structure is movably arranged in the mounting hole between a first position and a second position along the radial direction of the precast pile body; the push structure is provided with a truncated cone section;

[0027] When the push structure moves axially relative to the precast pile body, the outer peripheral side surface of the truncated cone segment contacts the translation structure and pushes the translation structure from the first position to the second position.

[0028] Optionally, the push-pushing structure comprises a first cylindrical section and the first truncated cone section; the small-diameter end of the first truncated cone section faces downward, and when the push-pushing structure descends axially relative to the precast pile body, the outer peripheral side surface of the first truncated cone section contacts the translation structure and pushes the translation structure from the first position to the second position;

[0029] Alternatively, the push-resisting structure comprises a second cylindrical section, a second truncated cone section and an avoidance section connected in sequence, and the avoidance section and the second truncated cone section are provided with avoidance grooves for avoiding the translation structure; the large-diameter end of the second truncated cone section faces downward, and when the push-resisting structure rises axially relative to the precast pile body, the outer peripheral side surface of the second truncated cone section contacts the translation structure and pushes the translation structure from the first position to the second position.

[0030] Optionally, the anti-pullout mechanism comprises:

[0031] Second base;

[0032] The anti-pullout assembly is provided with a third connecting rod and a fourth connecting rod, one end of the third connecting rod is hinged to the axial end of the precast pile body, the other end of the third connecting rod is hinged to one end of the fourth connecting rod, and the other end of the fourth connecting rod is hinged to the second base;

[0033] The fourth rotating shaft at the hinge between the third connecting rod and the precast pile body, the fifth rotating shaft at the hinge between the third connecting rod and the fourth connecting rod, and the sixth rotating shaft at the hinge between the fourth connecting rod and the second base are all arranged along the axial direction of the precast pile body.

[0034] Optionally, the anti-pullout mechanism further includes a third guide assembly, and the third guide assembly includes:

[0035] A third guide sleeve, one axial end of which is connected to the axial end of the precast pile body;

[0036] A fourth guide sleeve, one axial end of which is connected to a side of the second base facing the precast pile body; the third guide sleeve is sleeve-connected to the fourth guide sleeve, and the outer side wall of one of the third guide sleeve and the fourth guide sleeve is in contact with the inner side wall of the other; the third guide sleeve is movable axially relative to the fourth guide sleeve.

[0037] Optionally, a convex portion for increasing the friction between the second base and the ground is provided on a side of the second base away from the precast pile body, and the convex portion is serrated or columnar.

[0038] A construction method, applied to any of the prefabricated piles described above, comprising:

[0039] Align the precast pile with the pile hole;

[0040] Connecting at least two of the precast piles and placing them in the pile hole, or placing one of the precast piles in the pile hole;

[0041] Determine whether the number of butt joints of the precast piles meets the requirement, if yes, proceed to the next step, if no, return to the previous step;

[0042] Switch the anti-pullout component from the first position to the second position.

[0043] A construction method, applied to any of the prefabricated piles described above, comprising:

[0044] digging out the mud and sand in the pile hole and pouring solidifying material into the pile hole;

[0045] Align the precast pile with the pile hole;

[0046] Connecting at least two of the precast piles and placing them in the pile hole, or placing one of the precast piles in the pile hole;

[0047] Determine whether the number of butt joints of the precast piles meets the requirement, if yes, proceed to the next step, if no, return to the previous step;

[0048] The prefabricated pile is pressed downward to rotate the first connecting rod relative to the second connecting rod to the second position.

[0049] A construction method is applied to the above-mentioned prefabricated pile, wherein the push structure comprises a first cylindrical section and the first truncated cone section; the small diameter end of the first truncated cone section faces downward;

[0050] The construction method comprises:

[0051] An extension section is connected to the lower part of the precast pile at the bottom, and the bottom of the extension section is a conical surface or a plane with a cross section gradually increasing from bottom to top;

[0052] Align the precast pile with the pile hole;

[0053] Connecting at least two of the precast piles and placing them in the pile hole, or placing one of the precast piles in the pile hole;

[0054] Determine whether the number of butt joints of the precast piles meets the requirement, if yes, proceed to the next step, if no, return to the previous step;

[0055] Lowering the push structure from the central through hole of the precast pile until the outer peripheral side surface of the first truncated cone segment contacts the translation structure, and pushing the translation structure from the first position to the second position;

[0056] Pull out the push structure.

[0057] A construction method is applied to the above-mentioned prefabricated pile, wherein the push-pushing structure comprises a second cylindrical section, a second truncated cone section and an avoidance section connected in sequence, wherein the avoidance section and the second truncated cone section are provided with an avoidance groove for avoiding the translation structure; the large diameter end of the second truncated cone section faces downward;

[0058] The construction method comprises:

[0059] An extension section is connected to the lower part of the precast pile at the bottom, and the bottom of the extension section is a conical surface or a plane with a cross section gradually increasing from bottom to top;

[0060] Align the precast pile with the pile hole;

[0061] Connecting at least two of the precast piles and placing them in the pile hole, or placing one of the precast piles in the pile hole;

[0062] Determine whether the number of butt joints of the precast piles meets the requirement, if yes, proceed to the next step, if no, return to the previous step;

[0063] Align the avoidance groove of the push-resistance structure with the translation structure, and lower the push-resistance structure from the central through hole of the prefabricated pile to a preset position;

[0064] Rotating the push structure to make the avoidance groove offset from the translation structure;

[0065] The push structure is pulled out, the outer peripheral side surface of the second truncated cone segment contacts the translation structure, and the translation structure is pushed from the first position to the second position.

[0066] Optionally, the lower part of the precast pile at the bottom is connected to an extension section, the bottom of which is a conical surface or a plane with a gradually increasing cross-section from bottom to top, and includes:

[0067] The mud and sand in the pile hole are excavated, and a solidifying material is poured into the pile hole.

[0068] A construction method, applied to the above-mentioned prefabricated piles, comprising:

[0069] Align the precast pile with the pile hole;

[0070] Connecting at least two of the precast piles and placing them in the pile hole, or placing one of the precast piles in the pile hole;

[0071] Determine whether the number of butt joints of the precast piles meets the requirement, if yes, proceed to the next step, if no, return to the previous step;

[0072] The prefabricated pile is rotated to rotate the third connecting rod relative to the fourth connecting rod to the second position.

[0073] Optionally, before aligning the prefabricated pile with the pile hole, the method comprises:

[0074] digging out the mud and sand in the pile hole and pouring solidifying material into the pile hole;

[0075] Alternatively, an extension section is connected to the lower part of the precast pile at the bottom, and the bottom of the extension section is a conical surface with a cross section gradually increasing from bottom to top.

[0076] During actual use of the precast piles provided by the present invention, first, the precast piles need to be directly pressed into the construction position, or holes need to be drilled first and the precast piles placed in the holes; after the precast piles are installed in place, the anti-pullout components are switched to the second position by rotation, downward pressure or other structural pushing, and finally concrete is poured.

[0077] Compared with the prior art, the precast pile provided by the present invention has a pull-out assembly that, when the pull-out assembly is in the second position, protrudes outward from the outer peripheral side of the convex precast pile body. When subjected to an external force pulling up, the portion of the pull-out assembly that protrudes from the outer peripheral side of the precast pile body is fixed by concrete. The acting force between the portion of the pull-out assembly that protrudes from the outer peripheral side of the precast pile body and the solidified concrete, and the friction between the outer peripheral side of the precast pile body and the concrete can both be used to resist the external force pulling up. Compared with the prior art where only the friction between the outer peripheral side of the precast pile body and the concrete can be used to resist the external force pulling up, the precast pile provided by the present invention can effectively improve the pull-out resistance.

[0078] In addition, the present invention also provides a construction method applied to the above-mentioned prefabricated piles. BRIEF DESCRIPTION OF THE DRAWINGS

[0079] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0080] Figure 1 A schematic diagram of an application scenario of the prefabricated piles provided by the present invention;

[0081] Figure 2 A schematic diagram of the construction process of the prefabricated piles provided by the present invention;

[0082] Figure 3 A schematic diagram of the construction process of another prefabricated pile provided by the present invention;

[0083] Figure 4 A schematic diagram of the construction process of a specific embodiment 1 of the prefabricated pile provided by the present invention;

[0084] Figure 5 for Figure 4 Structural schematic diagram of the anti-pullout mechanism in FIG.

[0085] Figure 6 for Figure 5 Schematic cross-section of the pull-out mechanism;

[0086] Figure 7 A schematic diagram of the construction process of a specific embodiment 2 of the prefabricated pile provided by the present invention;

[0087] Figure 8 for Figure 7 Schematic cross-section of the pull-out mechanism;

[0088] Fig. 9 A schematic diagram of the construction process of a specific embodiment 3 of the prefabricated pile provided by the present invention;

[0089] Fig.10 for Fig. 9 Schematic diagram of the position change of the translation structure corresponding to each step of the precast pile construction process;

[0090] Fig.11 A schematic diagram of the construction process of a specific embodiment 4 of the prefabricated pile provided by the present invention;

[0091] Fig.12 for Fig.11 Schematic diagram of the position change of the translation structure corresponding to each step of the precast pile construction process;

[0092] Fig.13 for Fig.11A schematic cross-sectional view of the avoidance section of the middle thrust resistance structure;

[0093] Fig.14 A structural schematic diagram of a fourth specific embodiment of a prefabricated pile provided by the present invention, in which the anti-pullout assembly is in a first position;

[0094] Fig.15 for Fig.14 A perspective view of the pull-out mechanism;

[0095] Fig.16 A schematic structural diagram of a fourth specific embodiment of a prefabricated pile provided by the present invention, in which the anti-pullout assembly is in a second position;

[0096] Fig.17 for Fig.16 A perspective view of the pull-out mechanism;

[0097] Fig.18 A schematic diagram of a process flow of a specific embodiment 1 of the construction method provided by the present invention;

[0098] Fig.19 This is a schematic diagram of the actual construction process of the specific embodiment 2 of the construction method provided by the present invention;

[0099] Fig. 20 for Fig.19 A flow chart of the operation steps corresponding to the construction method;

[0100] Fig.21 This is a schematic diagram of the actual construction process of the specific embodiment 3 of the construction method provided by the present invention;

[0101] Fig. 22 A schematic diagram of an actual construction process in which a pile hole is not excavated in advance in the specific embodiment 3 of the construction method provided by the present invention;

[0102] Fig.23 for Fig.21 A flow chart of the operation steps corresponding to the construction method;

[0103] Fig.24 This is a schematic diagram of the actual construction process of the specific embodiment 4 of the construction method provided by the present invention;

[0104] Fig.25 A schematic diagram of an actual construction process in which a pile hole is not excavated in advance in a fourth specific embodiment of the construction method provided by the present invention;

[0105] Fig.26 for Fig.24 A flow chart of the operation steps corresponding to the construction method;

[0106] Fig. 27This is a schematic diagram of the actual construction process of a specific embodiment 5 of the construction method provided by the present invention;

[0107] Fig.28 for Fig. 27 A flow chart of the operation steps corresponding to the construction method;

[0108] Fig.29 This is a schematic diagram of the actual construction process of a specific embodiment 6 of the construction method provided by the present invention;

[0109] Fig.30 for Fig.29 A flow chart of the operation steps corresponding to the construction method;

[0110] Fig.31 This is a flow chart of specific embodiment 7 of the construction method provided by the present invention.

[0111] Figure 1-Figure 31 middle:

[0112] 001-Precast piles;

[0113] 1- Anti-pullout mechanism;

[0114] 11- first base;

[0115] 12- Anti-pullout components;

[0116] 121-first connecting rod; 122-second connecting rod; 1221-positioning member;

[0117] 123-translation structure; 124-resistance and push structure; 1241-avoidance groove;

[0118] 125-third connecting rod; 126-fourth connecting rod;

[0119] 13-locking assembly;

[0120] 131-first locking member; 1311-hook; 132-second locking member;

[0121] 14-a first guide assembly;

[0122] 141-first guide sleeve; 142-second guide sleeve;

[0123] 15- telescopic guide column;

[0124] 16- Second base;

[0125] 2- Precast pile body. DETAILED DESCRIPTION

[0126] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0127] The core of the present invention is to provide a precast pile. In actual use, by switching the anti-pullout component to the second position, the anti-pullout component can be protruded outward from the outer peripheral side of the convex precast pile body. After pouring concrete, the anti-pullout ability of the precast pile can be effectively improved.

[0128] Another core of the present invention is to provide a construction method applied to the above-mentioned precast piles.

[0129] The present specific embodiment discloses a precast pile 001, comprising a precast pile body 2 and an anti-pullout mechanism 1; the anti-pullout mechanism 1 is provided at least at one axial end of the precast pile body 2, the anti-pullout mechanism 1 comprises an anti-pullout component 12, the anti-pullout component 12 can be switched from a first position to a second position, specifically, the anti-pullout component can be switched from the first position to the second position by means of rotation, downward pressure or other structural pushing and the like; when the anti-pullout component 12 is located at the first position, the projection of the anti-pullout component 12 along the axial direction of the precast pile body 2 onto the precast pile body 2 is completely located inside the precast pile body 2; when the anti-pullout component 12 is located at the second position, the projection of the anti-pullout component 12 along the axial direction of the precast pile body 2 onto the precast pile body 2 is at least partially located outside the precast pile body 2.

[0130] It should be noted that the projection of the anti-pullout component 12 along the axial direction of the precast pile body 2 onto the precast pile body 2 mentioned in this specific embodiment is completely located inside the precast pile body 2, which means that the anti-pullout component 12 is not arranged beyond the outer peripheral side of the precast pile body 2, and the projection of the anti-pullout component 12 along the axial direction of the precast pile body 2 onto the precast pile body 2 is at least partially located outside the precast pile body 2, which means that the anti-pullout component 12 is arranged to protrude from the outer peripheral side of the precast pile body 2. When subjected to an external force pulling up upward, it is necessary to overcome the force between the portion of the anti-pullout component 12 protruding from the outer peripheral side of the precast pile body 2 and the solidified concrete.

[0131] The anti-pullout component 12 can be switched from the first position to the second position by telescopic means, or by rotational means, or by other means that meet the requirements, which is determined according to actual conditions and will not be elaborated here.

[0132] During actual use of the precast pile 001 provided in this specific embodiment, first, the precast pile 001 needs to be directly pressed into the construction position, or a hole needs to be drilled first and the precast pile 001 needs to be placed in the hole; after the precast pile 001 is installed in place, the anti-pullout component 12 is switched to the second position by rotating, pressing down, etc., and finally concrete is poured.

[0133] Compared with the prior art, in the precast pile 001 provided in this specific embodiment, when the anti-pullout component 12 is in the second position, the anti-pullout component 12 is arranged to protrude outward from the outer peripheral side surface of the convex precast pile body 2. When subjected to an external force pulling up, the portion of the anti-pullout component 12 protruding from the outer peripheral side surface of the precast pile body 2 is fixed by concrete. The acting force between the portion of the anti-pullout component 12 protruding from the outer peripheral side surface of the precast pile body 2 and the solidified concrete, and the friction between the outer peripheral side surface of the precast pile body 2 and the concrete can both be used to resist the external force pulling up. Compared with the situation in the prior art where only the friction between the outer peripheral side surface of the precast pile body 2 and the concrete can be used to resist the external force pulling up, the precast pile 001 provided by the present invention can effectively improve the anti-pullout capacity.

[0134] In a specific embodiment, the pull-out mechanism 1 includes a first base 11; the pull-out assembly 12 is provided with a first connecting rod 121 and a second connecting rod 122, one end of the first connecting rod 121 is hinged to the axial end of the precast pile body 2, the other end of the first connecting rod 121 is hinged to one end of the second connecting rod 122, and the other end of the second connecting rod 122 is hinged to the first base 11; the first rotating shaft at the hinge between the first connecting rod 121 and the precast pile body 2, the second rotating shaft at the hinge between the first connecting rod 121 and the second connecting rod 122, and the third rotating shaft at the hinge between the second connecting rod 122 and the first base 11 are all perpendicular to the axial direction of the precast pile body 2.

[0135] Combination Figure 4 , Figure 5 As shown, in actual use, when the precast pile 001 is pressed down to the initial preset position, the precast pile body 2 is continued to be pressed down, so that the precast pile body 2 moves downward along the axial direction relative to the first base 11. During the downward movement, the angle between the first connecting rod 121 and the second connecting rod 122 decreases, as shown in FIG. Figure 4 As shown in the figure from left to right in FIG. 1 , until the end where the first connecting rod 121 and the second connecting rod 122 are connected exceeds the outer peripheral side surface of the precast pile body 2.

[0136] On the basis of the above embodiment, the anti-pullout mechanism 1 may further include a locking assembly 13, which includes a first locking member 131 and a second locking member 132: one end of the first locking member 131 is connected to the axial end of the precast pile body 2; one end of the second locking member 132 is connected to the first base 11; one of the other end of the first locking member 131 and the other end of the second locking member 132 is provided with a hook 1311, and the other is provided with a slot engaged with the hook 1311; when the anti-pullout assembly 12 is located at the first position, the hook 1311 and the slot are in a disengaged state; when the anti-pullout assembly 12 is located at the second position, the hook 1311 and the slot are in an engaged state.

[0137] In actual use, Figure 4 As shown, in the initial state, the first locking member 131 and the second locking member 132 are at a certain distance. As the precast pile body 2 moves downward along the axial direction relative to the first base 11, the first locking member 131 and the second locking member 132 are constantly approaching each other until the hook 1311 is locked in the locking groove.

[0138] like Figure 5 As shown, at least one of the first connecting rod 121 and the second connecting rod 122 is provided with a positioning member 1221. When the positioning member 1221 contacts the outer side wall of the first guide assembly 14 toward the side of the first guide assembly 14, a first distance between the first rotating shaft and the central axis of the precast pile body 2 and a third distance between the third rotating shaft and the central axis of the precast pile body 2 are both smaller than a second distance between the second rotating shaft and the central axis of the precast pile body 2.

[0139] In actual use, in order to allow the first connecting rod 121 and the second connecting rod 122 to smoothly rotate relative to each other when the precast pile body 2 moves axially downward relative to the first base 11, and the second rotating shaft connecting the first connecting rod 121 and the second connecting rod 122 is located on the outside of the precast pile body 2, the positioning member 1221 is used to make the angle between the first connecting rod 121 and the second connecting rod 122 less than 180 degrees in the initial state. In the process of pressing down the precast pile body 2, the second rotating shaft is moved radially outwardly of the precast pile body 2 to avoid the first connecting rod 121 from rotating in the opposite direction relative to the second connecting rod 122.

[0140] In the process of pressing down the precast pile body 2, in order to press the precast pile body 2 downward in the axial direction and avoid deflection, a first guide assembly 14 can be provided. The first guide assembly 14 includes a first guide sleeve 141 and a second guide sleeve 142, wherein one axial end of the first guide sleeve 141 is connected to the axial end of the precast pile body 2; one axial end of the second guide sleeve 142 is connected to the side of the first base 11 facing the precast pile body 2; the first guide sleeve 141 and the second guide sleeve 142 are sleeved and connected, and the outer side wall of one of the first guide sleeve 141 and the second guide sleeve 142 is in contact with the inner side wall of the other; the first guide sleeve 141 is movable in the axial direction relative to the second guide sleeve 142.

[0141] like Figure 5 As shown, the first guide sleeve 141 is sleeve-connected with the second guide sleeve 142 and can telescopically move relative to each other along the axial direction.

[0142] On the other hand, the anti-pullout mechanism 1 may also include a second guide assembly, which includes a plurality of telescopic guide columns 15, which are arranged at intervals along the circumference of the precast pile body 2; one end of the telescopic guide column 15 is connected to the axial end of the precast pile body 2, and the other end of the telescopic guide column 15 is connected to the first base 11.

[0143] like Figure 7 , Figure 8 As shown, there are multiple telescopic guide columns 15, and the multiple telescopic guide columns 15 are evenly distributed along the circumference of the precast pile body 2. In actual use, when the precast pile body 2 moves axially relative to the first base 11, the telescopic guide columns 15 are shortened axially.

[0144] Specifically, the telescopic guide column 15 may include a fifth guide sleeve and a sixth guide sleeve, wherein one axial end of the fifth guide sleeve is connected to the axial end of the precast pile body 2; one axial end of the sixth guide sleeve is connected to the side of the first base 11 facing the precast pile body 2; the fifth guide sleeve is sleeve-connected to the sixth guide sleeve, and the outer side wall of one of the fifth guide sleeve and the sixth guide sleeve is in contact with the inner side wall of the other; the fifth guide sleeve is movable axially relative to the sixth guide sleeve.

[0145] In a specific embodiment, the anti-pullout component 12 includes a push structure 124 and a plurality of translation structures 123. The precast pile body 2 is provided with a central through hole, and the outer peripheral side surface of the precast pile body 2 is provided with a plurality of mounting holes penetrating the side wall along the circumferential direction. The translation structure 123 is movably arranged in the mounting hole between a first position and a second position along the radial direction of the precast pile body 2; the push structure 124 is provided with a first frustum section; when the push structure 124 moves axially relative to the precast pile body 2, the outer peripheral side surface of the first frustum section contacts the translation structure 123, and pushes the translation structure 123 from the first position to the second position.

[0146] like Fig. 9 As shown, the push structure 124 includes a first cylindrical section and a first conical section; the small diameter end of the first conical section faces downward, and when the push structure 124 descends axially relative to the precast pile body 2, the outer peripheral side surface of the first conical section contacts the translation structure 123 and pushes the translation structure 123 from the first position to the second position.

[0147] During actual use, the translation structure 123 is inserted into the circumferential mounting hole of the precast pile body 2 and is located at the first position. The translation structure 123 located at the first position is at least partially protruding from the inner side wall of the precast pile body 2. When the precast pile body 2 descends to a preset depth, the push structure 124 is controlled to descend. During the descent of the push structure 124, the outer peripheral side wall of the first truncated cone section of the push structure 124 contacts the translation structure 123. Since the small diameter end of the first truncated cone section faces downward, when the push structure 124 descends axially relative to the precast pile body 2, the outer peripheral side surface of the first truncated cone section contacts the translation structure 123. As the diameter of the first truncated cone section in contact with the translation structure 123 continues to increase, the translation structure 123 gradually moves from the first position to the second position until the translation structure 123 moves to the second position. The movement process of the translation structure 123 from the first position to the second position is as shown in FIG. Fig.10 When the translation structure 123 moves to the second position, the push structure 124 is controlled to rise; then subsequent filling operations can be performed.

[0148] On the other hand, Fig.11 As shown, the push-pushing structure 124 may include a second cylindrical section, a second truncated cone section and an avoidance section connected in sequence, and the avoidance section and the second truncated cone section are provided with an avoidance groove 1241 for avoiding the translation structure 123; the large diameter end of the second truncated cone section faces downward, and when the push-pushing structure 124 rises axially relative to the precast pile body 2, the outer peripheral side surface of the second truncated cone section contacts the translation structure 123 and pushes the translation structure 123 from the first position to the second position.

[0149] In actual use, combined with Fig.11 , Fig.12 , Fig.13 As shown, first, the avoidance groove 1241 on the avoidance section corresponds to the translation structure 123, and then Fig.11As shown, the push structure 124 is lowered along the axial direction of the precast pile body 2 to the lower part of the translation structure 123, so that the small diameter end of the second truncated cone section is close to the translation structure 123, and then the push structure 124 is rotated to make the avoidance groove 1241 on the avoidance section avoid the translation structure 123, and the push structure 124 is pulled upward along the axial direction of the precast pile body 2 to move the push structure 124 upward along the axial direction of the precast pile body 2. During the movement, the outer peripheral side surface of the second truncated cone section contacts the translation structure 123. As the diameter of the second truncated cone section in contact with the translation structure 123 continues to increase, the translation structure 123 gradually moves from the first position to the second position until the translation structure 123 moves to the second position. The movement process of the translation structure 123 from the first position to the second position is shown in FIG. Fig.12 When the translation structure 123 moves to the second position, the push structure 124 is controlled to rise; then subsequent filling operations can be performed.

[0150] In a specific embodiment, the anti-pullout mechanism 1 can include a second base 16; the anti-pullout assembly 12 is provided with a third connecting rod 125 and a fourth connecting rod 126, one end of the third connecting rod 125 is hinged to the axial end of the precast pile body 2, the other end of the third connecting rod 125 is hinged to one end of the fourth connecting rod 126, and the other end of the fourth connecting rod 126 is hinged to the second base 16; the fourth rotating shaft at the hinge between the third connecting rod 125 and the precast pile body 2, the fifth rotating shaft at the hinge between the third connecting rod 125 and the fourth connecting rod 126, and the sixth rotating shaft at the hinge between the fourth connecting rod 126 and the second base 16 are all arranged along the axial direction of the precast pile body 2.

[0151] The anti-pullout mechanism 1 also includes a third guide assembly, which includes a third guide sleeve and a fourth guide sleeve; one axial end of the third guide sleeve is connected to the axial end of the precast pile body 2; one axial end of the fourth guide sleeve is connected to the side of the second base 16 facing the precast pile body 2; the third guide sleeve is sleeve-connected to the fourth guide sleeve, and the outer side wall of one of the third guide sleeve and the fourth guide sleeve is in contact with the inner side wall of the other; the third guide sleeve is movable axially relative to the fourth guide sleeve.

[0152] In actual use, first, the precast pile 001 needs to be directly pressed into the construction position, or a hole needs to be drilled first and the precast pile 001 is placed in the hole; after the precast pile 001 is installed in place, the pull-out resistant assembly 12 is switched to the second position by rotation, and finally concrete is poured. Figures 14 to 17As shown, in the process of the precast pile body 2 rotating relative to the second base 16, in order to prevent the second base 16 from rotating, a convex portion for increasing the friction between the second base 16 and the ground can be provided on the side of the second base 16 away from the precast pile body 2, and the convex portion can be provided in a sawtooth shape or a columnar shape to improve the connection reliability between the second base 16 and the ground. In the process of the precast pile body 2 rotating relative to the second base 16, the third connecting rod 125 will rotate relative to the fourth connecting rod 126. In the process of rotation, the angle between the third connecting rod 125 and the fourth connecting rod 126 is continuously reduced. At the same time, the fifth rotating shaft connecting the third connecting rod 125 and the fourth connecting rod 126 moves to the outside of the outer peripheral side of the precast pile body 2, so that the third connecting rod 125 and the fourth connecting rod 126 at least partially extend out of the outer peripheral side of the precast pile body 2.

[0153] In addition to the above-mentioned prefabricated piles, the present invention also provides a construction method applied to the above-mentioned prefabricated piles, and the construction method comprises:

[0154] Step S1, aligning the prefabricated pile with the pile hole;

[0155] Step S2, docking at least two precast piles and placing them in the pile hole, or placing one precast pile in the pile hole;

[0156] Step S3, judging whether the number of butt joints of the precast piles meets the requirement, if so, proceeding to step S4, if not, returning to step S2;

[0157] Step S4, switching the anti-pullout component 12 from the first position to the second position.

[0158] In a specific embodiment, the pull-out mechanism 1 includes a first base 11; the pull-out assembly 12 is provided with a first connecting rod 121 and a second connecting rod 122, one end of the first connecting rod 121 is hinged to the axial end of the precast pile body 2, the other end of the first connecting rod 121 is hinged to one end of the second connecting rod 122, and the other end of the second connecting rod 122 is hinged to the first base 11; the first rotating shaft at the hinge between the first connecting rod 121 and the precast pile body 2, the second rotating shaft at the hinge between the first connecting rod 121 and the second connecting rod 122, and the third rotating shaft at the hinge between the second connecting rod 122 and the first base 11 are all perpendicular to the axial direction of the precast pile body 2.

[0159] Construction methods include:

[0160] Step S10, digging out the mud and sand in the pile hole, and pouring solidifying material into the pile hole;

[0161] Step S11, aligning the prefabricated pile with the pile hole;

[0162] Step S12, docking at least two prefabricated piles and placing them in the pile hole, or placing one prefabricated pile in the pile hole;

[0163] Step S13, determining whether the number of precast piles connected to each other meets the requirement, if yes, proceeding to step S14, if no, returning to step S12;

[0164] Step S14, pressing down the precast pile to rotate the first connecting rod relative to the second connecting rod to a second position.

[0165] In a specific embodiment, the anti-pullout assembly 12 includes a push structure 124 and a plurality of translation structures 123. The precast pile body 2 is provided with a central through hole, and the outer peripheral side surface of the precast pile body 2 is provided with a plurality of mounting holes penetrating the side wall along the circumferential direction. The translation structure 123 is movably arranged in the mounting hole between a first position and a second position along the radial direction of the precast pile body 2; when the push structure 124 includes a first cylindrical section and a first truncated cone section; the small diameter end of the first truncated cone section faces downward, when the push structure 124 descends axially relative to the precast pile body 2, the outer peripheral side surface of the first truncated cone section contacts the translation structure 123, and the translation structure 123 is pushed from the first position to the second position, the construction method includes:

[0166] Step S20, connecting an extension section to the lower part of the precast pile at the bottom, wherein the bottom of the extension section is a conical surface or a plane with a cross section gradually increasing from bottom to top;

[0167] It should be noted that the extension section is provided in this step mainly so that the push structure 124 can extend out of the bottom of the prefabricated pile at the bottom during the process below. If the mud and sand in the pile hole are not dug out in advance, the bottom of the extension section is generally set to a conical surface with a gradually increasing cross-section from bottom to top; if the mud and sand in the pile hole are dug out in advance, the bottom of the extension section can be set to a plane. Of course, in the actual construction process, whether the bottom of the extension section is specifically set to a conical surface or a plane needs to be comprehensively considered based on the hardness of the geology, construction efficiency requirements, construction conditions, etc.

[0168] Step S21, aligning the prefabricated pile with the pile hole;

[0169] Step S22, docking at least two of the precast piles and placing them in the pile hole, or placing one of the precast piles in the pile hole;

[0170] Step S23, determining whether the number of precast piles connected to each other meets the requirement, if yes, proceeding to step S24, if no, returning to step S22;

[0171] Step S24, lowering the push structure 124 from the central through hole of the prefabricated pile until the outer peripheral side surface of the first truncated cone segment contacts the translation structure 123, and pushing the translation structure 123 from the first position to the second position;

[0172] Step S25 , pulling out the pushing structure 124 .

[0173] When the push-pushing structure 124 includes a second cylindrical section, a second truncated cone section and an avoidance section connected in sequence, and the avoidance section and the second truncated cone section are provided with an avoidance groove 1241 for avoiding the translation structure 123; the large diameter end of the second truncated cone section faces downward, when the push-pushing structure 124 rises axially relative to the precast pile body 2, the outer peripheral side surface of the second truncated cone section contacts the translation structure 123, and the translation structure 123 is pushed from the first position to the second position, the construction method includes:

[0174] Step S30, connecting an extension section to the lower part of the precast pile at the bottom, wherein the bottom of the extension section is a conical surface or a plane with a cross section gradually increasing from bottom to top;

[0175] It should be noted that the extension section is provided in this step mainly so that the push structure 124 can extend out of the bottom of the prefabricated pile at the bottom during the process below. If the mud and sand in the pile hole are not dug out in advance, the bottom of the extension section is generally set to a conical surface with a gradually increasing cross-section from bottom to top; if the mud and sand in the pile hole are dug out in advance, the bottom of the extension section can be set to a plane. Of course, in the actual construction process, whether the bottom of the extension section is specifically set to a conical surface or a plane needs to be comprehensively considered based on the hardness of the geology, construction efficiency requirements, construction conditions, etc.

[0176] Step S31, aligning the prefabricated pile with the pile hole;

[0177] Step S32, docking at least two prefabricated piles and placing them in the pile hole, or placing one prefabricated pile in the pile hole;

[0178] Step S33, determining whether the number of precast piles connected to each other meets the requirement, if yes, proceeding to step S34, if no, returning to step S32;

[0179] Step S34, aligning the avoidance groove 1241 of the push structure 124 with the translation structure 123, and lowering the push structure 124 from the central through hole of the prefabricated pile to a preset position;

[0180] Step S35, rotating the pushing structure 124 to make the avoiding groove 1241 offset the translation structure 123;

[0181] Step S36 , pulling out the push structure 124 , the outer peripheral side surface of the second truncated cone segment contacts the translation structure 123 , and pushing the translation structure 123 from the first position to the second position.

[0182] Before step S20 and step S30, the following steps may be included:

[0183] Step S01, digging out the mud and sand in the pile hole, and pouring solidifying material into the pile hole.

[0184] In a specific embodiment, the anti-pullout mechanism 1 includes a second base 16; the anti-pullout assembly 12 is provided with a third connecting rod 125 and a fourth connecting rod 126, one end of the third connecting rod 125 is hinged to the axial end of the precast pile body 2, the other end of the third connecting rod 125 is hinged to one end of the fourth connecting rod 126, and the other end of the fourth connecting rod 126 is hinged to the second base 16; the fourth rotating shaft at the hinge between the third connecting rod 125 and the precast pile body 2, the fifth rotating shaft at the hinge between the third connecting rod 125 and the fourth connecting rod 126, and the sixth rotating shaft at the hinge between the fourth connecting rod 126 and the second base 16 are all arranged along the axial direction of the precast pile body 2.

[0185] Construction methods include:

[0186] Step S41, aligning the prefabricated pile with the pile hole;

[0187] Step S42, docking at least two prefabricated piles and placing them in the pile hole, or placing one prefabricated pile in the pile hole;

[0188] Step S43, determining whether the number of precast piles connected to each other meets the requirement, if yes, proceed to S44, if no, return to S42;

[0189] Step S44 , rotating the prefabricated pile to rotate the third connecting rod 125 to a second position relative to the fourth connecting rod 126 .

[0190] Before step S41, the following steps are also included:

[0191] Step S02, digging out the mud and sand in the pile hole, and pouring solidifying material into the pile hole;

[0192] Or, before step S41, the following steps may also be included:

[0193] Step S03, connecting an extension section to the lower part of the precast pile at the bottom, wherein the bottom of the extension section is a conical surface with a gradually increasing cross-section from bottom to top.

[0194] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. Any combination of all embodiments provided by the present invention is within the protection scope of this invention and will not be described in detail here.

[0195] The prefabricated piles and construction methods provided by the present invention are introduced in detail above. Specific examples are used in this article to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method and core ideas of the present invention. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present invention, the present invention can also be improved and modified in a number of ways, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A prefabricated pile, characterized in that: include: Precast pile body (2); An anti-pullout mechanism (1), wherein at least one axial end of the prefabricated pile body (2) is provided with the anti-pullout mechanism (1), wherein the anti-pullout mechanism (1) comprises an anti-pullout component (12), and the anti-pullout component (12) can be switched from a first position to a second position; When the anti-pullout component (12) is located at the first position, the projection of the anti-pullout component (12) along the axial direction of the precast pile body (2) onto the precast pile body (2) is completely located inside the precast pile body (2); When the anti-pullout component (12) is located at the second position, a projection of the anti-pullout component (12) along the axial direction of the precast pile body (2) onto the precast pile body (2) is at least partially located outside the precast pile body (2).

2. The prefabricated pile according to claim 1, characterized in that: The anti-pullout mechanism (1) comprises: first base (11); The anti-pulling assembly (12) is provided with a first connecting rod (121) and a second connecting rod (122), one end of the first connecting rod (121) is hinged to the axial end of the precast pile body (2), the other end of the first connecting rod (121) is hinged to one end of the second connecting rod (122), and the other end of the second connecting rod (122) is hinged to the first base (11); A first rotation axis at the hinge between the first connecting rod (121) and the precast pile body (2), a second rotation axis at the hinge between the first connecting rod (121) and the second connecting rod (122), and a third rotation axis at the hinge between the second connecting rod (122) and the first base (11) are all perpendicular to the axial direction of the precast pile body (2).

3. The prefabricated pile according to claim 2, characterized in that: The anti-pullout mechanism (1) further comprises a locking assembly (13), wherein the locking assembly (13) comprises: A first locking member (131), one end of which is connected to the axial end of the precast pile body (2); A second locking member (132), one end of which is connected to the first base (11); One of the other end of the first locking member (131) and the other end of the second locking member (132) is provided with a hook (1311), and the other is provided with a slot engaged with the hook (1311); when the anti-pullout component (12) is located at the first position, the hook (1311) and the slot are in a disengaged state; when the anti-pullout component (12) is located at the second position, the hook (1311) and the slot are in an engaged state.

4. The prefabricated pile according to claim 2, characterized in that: The anti-pullout mechanism (1) further comprises a first guide assembly (14), wherein the first guide assembly (14) comprises: A first guide sleeve (141), one axial end of which is connected to the axial end of the precast pile body (2); The second guide sleeve (142) has one axial end connected to a side of the first base (11) facing the precast pile body (2); the first guide sleeve (141) and the second guide sleeve (142) are sleeve-connected, and the outer wall of one of the first guide sleeve (141) and the second guide sleeve (142) fits with the inner wall of the other; the first guide sleeve (141) is movable in the axial direction relative to the second guide sleeve (142).

5. The prefabricated pile according to claim 4, characterized in that: At least one of the first connecting rod (121) and the second connecting rod (122) is provided with a positioning member (1221). When the positioning member (1221) contacts the outer side wall of the first guide assembly (14) toward the side of the first guide assembly (14), a first distance between the first rotating shaft and the central axis of the precast pile body (2) and a third distance between the third rotating shaft and the central axis of the precast pile body (2) are both smaller than a second distance between the second rotating shaft and the central axis of the precast pile body (2).

6. The prefabricated pile according to claim 2, characterized in that: The anti-pulling mechanism (1) further comprises a second guide assembly, the second guide assembly comprising a plurality of telescopic guide columns (15), the plurality of telescopic guide columns (15) being arranged at intervals along the circumference of the precast pile body (2); one end of the telescopic guide column (15) is connected to an axial end of the precast pile body (2), and the other end of the telescopic guide column (15) is connected to the first base (11).

7. The prefabricated pile according to claim 1, characterized in that: The anti-pulling component (12) comprises a push structure (124) and a plurality of translation structures (123); the precast pile body (2) is provided with a central through hole; the outer peripheral side surface of the precast pile body (2) is provided with a plurality of mounting holes penetrating the side wall along the circumferential direction; the translation structure (123) is movably arranged in the mounting hole between a first position and a second position along the radial direction of the precast pile body (2); the push structure (124) is provided with a truncated cone section; When the push structure (124) moves axially relative to the precast pile body (2), the outer peripheral side surface of the truncated cone segment contacts the translation structure (123) and pushes the translation structure (123) from the first position to the second position.

8. The prefabricated pile according to claim 7, characterized in that: The push-pushing structure (124) comprises a first cylindrical section and the first truncated cone section; the small-diameter end of the first truncated cone section faces downward, and when the push-pushing structure (124) descends axially relative to the precast pile body (2), the outer peripheral side surface of the first truncated cone section contacts the translation structure (123) and pushes the translation structure (123) from the first position to the second position; Alternatively, the push-resistance structure (124) comprises a second cylindrical section, a second truncated cone section and an avoidance section which are connected in sequence, and the avoidance section and the second truncated cone section are provided with an avoidance groove (1241) for avoiding the translation structure (123); the large diameter end of the second truncated cone section faces downward, and when the push-resistance structure (124) rises axially relative to the precast pile body (2), the outer peripheral side surface of the second truncated cone section contacts the translation structure (123), and pushes the translation structure (123) from the first position to the second position.

9. The prefabricated pile according to claim 1, characterized in that: The anti-pullout mechanism (1) comprises: Second base (16); The anti-pulling assembly (12) is provided with a third connecting rod (125) and a fourth connecting rod (126), one end of the third connecting rod (125) is hinged to the axial end of the precast pile body (2), the other end of the third connecting rod (125) is hinged to one end of the fourth connecting rod (126), and the other end of the fourth connecting rod (126) is hinged to the second base (16); The fourth rotation axis at the hinge between the third connecting rod (125) and the precast pile body (2), the fifth rotation axis at the hinge between the third connecting rod (125) and the fourth connecting rod (126), and the sixth rotation axis at the hinge between the fourth connecting rod (126) and the second base (16) are all arranged along the axial direction of the precast pile body (2).

10. The prefabricated pile according to claim 9, characterized in that: The anti-pullout mechanism (1) further comprises a third guide assembly, wherein the third guide assembly comprises: A third guide sleeve, one axial end of which is connected to the axial end of the precast pile body (2); A fourth guide sleeve, one axial end of which is connected to a side of the second base (16) facing the precast pile body (2); the third guide sleeve and the fourth guide sleeve are sleeve-connected, and the outer side wall of one of the third guide sleeve and the fourth guide sleeve is in contact with the inner side wall of the other; the third guide sleeve is movable axially relative to the fourth guide sleeve.

11. The prefabricated pile according to claim 9, characterized in that: A convex portion for increasing the friction between the second base (16) and the ground is provided on a side of the second base (16) away from the precast pile body (2); the convex portion is sawtooth-shaped or columnar.

12. A construction method, characterized in that: Applied to the prefabricated pile according to any one of claims 1 to 11, the construction method comprises: Align the precast pile with the pile hole; Connecting at least two of the precast piles and placing them in the pile hole, or placing one of the precast piles in the pile hole; Determine whether the number of butt joints of the precast piles meets the requirement, if yes, proceed to the next step, if no, return to the previous step; The anti-pullout component (12) is switched from the first position to the second position.

13. A construction method, characterized in that: Applied to the prefabricated pile according to any one of claims 2 to 6, the construction method comprises: digging out the mud and sand in the pile hole and pouring solidifying material into the pile hole; Align the precast pile with the pile hole; Connecting at least two of the precast piles and placing them in the pile hole, or placing one of the precast piles in the pile hole; Determine whether the number of butt joints of the precast piles meets the requirement, if yes, proceed to the next step, if no, return to the previous step; The prefabricated pile is pressed downward to rotate the first connecting rod (121) relative to the second connecting rod (122) to the second position.

14. A construction method, characterized in that: Applicable to the prefabricated pile according to claim 7 or 8, the push structure (124) comprises a first cylindrical section and the first truncated cone section; the small diameter end of the first truncated cone section faces downward; The construction method comprises: An extension section is connected to the lower part of the precast pile at the bottom, and the bottom of the extension section is a conical surface or a plane with a cross section gradually increasing from bottom to top; Align the precast pile with the pile hole; Connecting at least two of the precast piles and placing them in the pile hole, or placing one of the precast piles in the pile hole; Determine whether the number of butt joints of the precast piles meets the requirement, if yes, proceed to the next step, if no, return to the previous step; Lowering the push structure (124) from the central through hole of the prefabricated pile until the outer peripheral side surface of the first truncated cone segment contacts the translation structure (123), and pushing the translation structure (123) from the first position to the second position; Pull out the push-resisting structure (124).

15. A construction method, characterized in that: Applicable to the prefabricated pile according to claim 7 or 8, the push structure (124) comprises a second cylindrical section, a second truncated cone section and an avoidance section connected in sequence, the avoidance section and the second truncated cone section are provided with an avoidance groove (1241) for avoiding the translation structure (123); the large diameter end of the second truncated cone section faces downward; The construction method comprises: An extension section is connected to the lower part of the precast pile at the bottom, and the bottom of the extension section is a conical surface or a plane with a cross section gradually increasing from bottom to top; Align the precast pile with the pile hole; Connecting at least two of the precast piles and placing them in the pile hole, or placing one of the precast piles in the pile hole; Determine whether the number of butt joints of the precast piles meets the requirement, if yes, proceed to the next step, if no, return to the previous step; Aligning the avoidance groove (1241) of the push-resistance structure (124) with the translation structure (123), and lowering the push-resistance structure (124) from the central through hole of the prefabricated pile to a preset position; Rotating the push structure (124) to cause the avoidance groove (1241) to deviate from the translation structure (123); The push structure (124) is pulled out, the outer peripheral side surface of the second truncated cone segment contacts the translation structure (123), and the translation structure (123) is pushed from the first position to the second position.

16. The construction method according to claim 14 or 15, characterized in that: The lower part of the precast pile at the bottom is connected to the extension section, and the bottom of the extension section is a conical surface or a plane with a gradually increasing cross-section from bottom to top, including: The mud and sand in the pile hole are excavated, and a solidifying material is poured into the pile hole.

17. A construction method, characterized in that: Applied to the prefabricated piles according to claims 9 to 11, the construction method comprises: Align the precast pile with the pile hole; Connecting at least two of the precast piles and placing them in the pile hole, or placing one of the precast piles in the pile hole; Determine whether the number of butt joints of the precast piles meets the requirement, if yes, proceed to the next step, if no, return to the previous step; The prefabricated pile is rotated to rotate the third connecting rod (125) to the second position relative to the fourth connecting rod (126).

18. The construction method according to claim 17, characterized in that: Before aligning the prefabricated pile with the pile hole, the method includes: digging out the mud and sand in the pile hole and pouring solidifying material into the pile hole; Alternatively, an extension section is connected to the lower part of the precast pile at the bottom, and the bottom of the extension section is a conical surface with a cross section gradually increasing from bottom to top.

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