Variable-diameter pile cap and piling system

Abstract

The utility model relates to the technical field of pile foundation construction, in particular to a variable-diameter pile cap and a piling system.The pile cap comprises an upper pile cap body and a lower pile cap body, the lower pile cap body comprises a first sleeve and a second sleeve, and the first sleeve is connected with the upper pile cap body; the first sleeve is detachably connected with the second sleeve; when the first sleeve and the second sleeve are connected, the first sleeve is arranged outside the second sleeve in a sleeving mode. Through the detachable connection of the first sleeve and the second sleeve, when piles with different pile diameters are switched, only the first sleeve and the second sleeve need to be disassembled and assembled, and the second sleeve is taken out of or put into the first sleeve, so that the purpose of simply and quickly switching the pile diameters is achieved, the labor and the time are saved, and the working efficiency is improved. And the working efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of pile foundation construction, and particularly relates to a variable-diameter pile cap and a pile driving system. Background Art

[0002] In the construction of cement precast pile columns in existing pile foundation construction, when facing pile columns with different pile diameters, often one pile hammer is used, and pile caps with corresponding inner diameters need to be matched for pile columns with different pile diameters. Therefore, the pile cap needs to be variable in diameter.

[0003] The variable-diameter methods mainly include the following: one is to use multiple lower pile caps with different inner diameters. The lower pile caps with different inner diameters are matched with pile columns with corresponding pile diameters. Each time the pile diameter is switched, a circle of connecting bolts between the upper pile cap and the lower pile cap needs to be disassembled, the substitute ram needs to be disassembled, and after replacing the lower pile cap, the substitute ram and the connecting bolts need to be installed; the second is to first use a lower pile cap with a larger inner diameter. When a lower pile cap with a smaller inner diameter is needed, multiple rib plates are welded inside the large-diameter pile cap, and the inner circle formed by the rib plates is matched with the smaller inner diameter. When a lower pile cap with a larger inner diameter is needed, the welded rib plates need to be cut off with a gas welding torch, and this cycle is repeated to meet the switching of different inner diameters; the third is to match a lower pile cap with a larger inner diameter. When switching to a smaller inner diameter, two rows of positioning plates are installed on the inner wall of the lower pile cap with a larger inner diameter by bolts to meet the variable-diameter requirement.

[0004] In the above variable-diameter construction process, a large number of auxiliary tools and professional personnel need to be equipped, and the variable-diameter process is relatively complex, taking a long time as a whole, which affects the construction efficiency. Content of the Utility Model

[0005] The purpose of the utility model is to overcome the technical problems in the prior art that a large number of auxiliary tools and professional personnel need to be equipped for variable diameter, the variable-diameter process is relatively complex, taking a long time as a whole, and affecting the construction efficiency, and to provide a variable-diameter pile cap and a pile driving system.

[0006] In a first aspect, the utility model provides a variable-diameter pile cap, which includes an upper pile cap and a lower pile cap. The lower pile cap includes a first sleeve and a second sleeve. The first sleeve is connected to the upper pile cap; the first sleeve and the second sleeve are detachably connected; when the first sleeve and the second sleeve are connected, the first sleeve is sleeved outside the second sleeve.

[0007] The inner diameter of the first sleeve is greater than the outer diameter of the second sleeve which is greater than the inner diameter of the second sleeve. The inner diameter of the first sleeve is adapted to a pile column with a larger pile diameter, and the second sleeve is adapted to a pile column with a smaller pile diameter. Here, "adapted" means that the sleeve can be used as a lower pile cap to cooperate with the corresponding pile column for pile driving operation.

[0008] Wherein, the connection between the first sleeve and the second sleeve is detachable. When the first sleeve and the second sleeve are connected, the first sleeve is sleeved outside the second sleeve, and the bottom opening of the second sleeve is exposed at the bottom opening of the first sleeve, so that a pile column with a smaller pile diameter can pass through the bottom opening of the first sleeve and extend into the second sleeve from the bottom opening of the second sleeve.

[0009] During the construction process, if a pile column with a larger pile diameter needs to be used, the connection between the first sleeve and the second sleeve can be released, the second sleeve can be taken out from the first sleeve, and the first sleeve can be sleeved outside the pile column with a larger pile diameter, then pile driving can be carried out on the pile column with a larger pile diameter; if a pile column with a smaller pile diameter needs to be used, the second sleeve can be placed into the first sleeve, the first sleeve and the second sleeve can be connected, and the second sleeve can be sleeved outside the pile column with a smaller pile diameter, then pile driving can be carried out on the pile column with a smaller pile diameter.

[0010] Optionally, the lower pile cap further includes a plurality of positioning members, and the plurality of positioning members are detachably arranged on the side surface of the first sleeve. The ends of the plurality of positioning members can pass through the first sleeve and abut against the outer side of the second sleeve, so as to position the radial position of the second sleeve in the first sleeve and realize the radial clamping of the second sleeve in the first sleeve.

[0011] Optionally, the positioning member includes a pin shaft, and a positioning hole for the pin shaft to pass through is formed on the side surface of the first sleeve. The pin shaft is detachably connected to the first sleeve through a pin.

[0012] Optionally, a thickened part is arranged on the outer surface of the first sleeve corresponding to the positioning hole, and the thickened part has a through hole for the pin to pass through, thereby specifically increasing the length of the positioning hole and reducing the possible deflection of the positioning member in the positioning hole.

[0013] Optionally, the number of the positioning members is four, and the four positioning members are evenly spaced along the circumferential direction of the first sleeve.

[0014] Optionally, a plurality of reinforcing plates are arranged on the outer side of the second sleeve.

[0015] Optionally, the top end of the second sleeve has a boss, and the boss is in front of the positioning member facing the upper pile cap, so as to prevent the second sleeve from sliding out of the first sleeve.

[0016] Optionally, the boss is an annular structure arranged circumferentially along the second sleeve; or, the boss is an arc-shaped structure arranged circumferentially along the second sleeve. Define the two reinforcing plates adjacent to the positioning member as a reinforcing plate group. The arc-shaped structure is arranged between the two reinforcing plates of the reinforcing plate group, and both ends of the arc-shaped structure are connected to the two corresponding reinforcing plates of the reinforcing plate group.

[0017] Optionally, the bottom ends of the first sleeve and the second sleeve are provided with a flared structure with an enlarged diameter outward, guiding the top ends of the corresponding pile columns to extend into the corresponding sleeves from the bottom openings of the first sleeve or the second sleeve.

[0018] In a second aspect, the present invention provides a pile driving system, including a plurality of pile columns and a variable-diameter pile cap according to any one of the above solutions; the pile diameters of the plurality of pile columns are different from each other. The variable-diameter pile cap includes the first sleeve and several second sleeves. The first sleeve can be detachably connected to any one of the second sleeves; the first sleeve is adapted to the pile column with the largest pile diameter among the plurality of pile columns, and several second sleeves correspond one by one to several pile columns other than the pile column with the largest pile diameter, and the corresponding second sleeve and the pile column are adapted to each other.

[0019] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0020] 1. For the variable-diameter pile cap provided by the present invention, through the detachable connection between the first sleeve and the second sleeve, when switching pile columns with different pile diameters, only the disassembly and assembly between the first sleeve and the second sleeve need to be carried out, and the second sleeve is taken out of or put into the first sleeve, thereby achieving the purpose of simply and quickly switching the pile diameter, saving labor and time, and improving work efficiency.

[0021] 2. For the pile driving system provided by the present invention, through the cooperation between the first sleeve and several second sleeves, the variable-diameter pile cap can be applied to the pile driving operation of pile columns with different pile diameters through the first sleeve or the second sleeve, having a large pile diameter adaptation range. And when switching pile columns with different pile diameters, only the disassembly and assembly between the first sleeve and the second sleeve need to be carried out, and the second sleeve is taken out of or put into the first sleeve, thereby achieving the purpose of simply and quickly switching the pile diameter, saving labor and time, and improving work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a three-dimensional structural schematic diagram of Embodiment 1 of the present invention.

[0023] Figure 2 It is a front internal schematic diagram of Embodiment 1 of the present invention.

[0024] Figure 3 It is a schematic internal view from above of Embodiment 1 of the present utility model.

[0025] Markings in the figure:

[0026] 1 - upper pile cap; 2 - first sleeve; 3 - pin shaft; 4 - pin; 5 - thickened part; 6 - second sleeve; 7 - reinforcing plate; 8 - boss; 9 - bell mouth structure. Specific embodiments

[0027] The present utility model will be further described in detail below in conjunction with specific embodiments. However, this should not be construed as limiting the scope of the above - mentioned subject matter of the present utility model to the following embodiments. All technologies implemented based on the content of the present utility model belong to the scope of the present utility model.

[0028] In the description of the specific embodiments of the present utility model without special instructions, the expression terms indicating the orientation or positional relationship such as "upper", "lower", "left", "right", "center", "inner", "outer", etc. are all based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship when the utility model product / device / equipment is commonly used. These terms of orientation or positional relationship are only for facilitating the description of the present utility model solution or simplifying the description in specific embodiments, so as to enable technicians to quickly understand the solution, rather than indicating or implying that a specific device / component / element must have a specific orientation or be constructed and operated in a specific positional relationship. Therefore, it should not be construed as a limitation to the present utility model.

[0029] In addition, if terms such as "horizontal", "vertical", "suspended", "parallel" etc. appear, it does not mean that the corresponding device / component / element is required to be absolutely horizontal or vertical or suspended or parallel, but it can be slightly inclined or have a deviation. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and it does not mean that the structure must be completely horizontal, but it can be slightly inclined. Or, it can be simply understood that the corresponding device / component / element is arranged in the "horizontal", "vertical", "suspended", "parallel" etc. directions and can have an error / deviation of ±10% relative to the corresponding direction setting, more preferably within ±8%, more preferably within ±6%, more preferably within ±5%, more preferably within ±4%. As long as the corresponding device / component / element is within the error / deviation range, it can still achieve its function in the solution of the present utility model.

[0030] In addition, the expressions such as "first", "second", "third", etc. appearing in the terms are only used to distinguish the description of the same or similar components, and should not be understood as emphasizing or implying the relative importance of specific components.

[0031] In addition, in the description of the embodiments of the present utility model, "several", "multiple", and "a number of" represent at least two. It can be any situation such as 2, 3, 4, 5, 6, 7, 8, 9, etc., and even can be a situation exceeding 9.

[0032] In addition, in the description of the technical solutions of the present utility model, unless otherwise clearly specified / defined / restricted, where terms such as "set", "installed", "connected", "connected to", "provided with", "laid", and "arranged" appear, they should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection. It can be common connection means in the art such as welding, riveting, bolting, and threaded connection. Such a connection can be a mechanical connection, an electrical connection, or a communication connection; it can be directly connected or indirectly connected through an intermediate medium, and can be the communication inside two components.

[0033] Embodiment 1

[0034] As Figures 1 - 3 shown, a variable-diameter pile cap includes an upper pile cap 1 and a lower pile cap. The lower pile cap includes a first sleeve 2 and a second sleeve 6. The first sleeve 2 is connected to the upper pile cap 1; the first sleeve 2 is detachably connected to the second sleeve 6; when the first sleeve 2 and the second sleeve 6 are connected, the first sleeve 2 is sleeved outside the second sleeve 6.

[0035] At this time, as Figures 2 - 3 shown, the inner diameter of the first sleeve 2 is greater than the outer diameter of the second sleeve 6 which is greater than the inner diameter of the second sleeve 6. The inner diameter of the first sleeve 2 is adapted to a pile column with a larger pile diameter, and the second sleeve 6 is adapted to a pile column with a smaller pile diameter. Here, "adapted" means that the sleeve can be used as a lower pile cap to cooperate with the corresponding pile column for pile driving operations.

[0036] Among them, the lower pile cap is integrally connected to the upper pile cap 1 through the first sleeve 2. The connection method between the first sleeve 2 and the upper pile cap 1 can be bolt connection. When the first sleeve 2 is connected to the upper pile cap 1, the upper pile cap 1 can cover the top openings of the first sleeve 2 and the second sleeve 6 to bear the knocking force during pile driving and transmit it to the pile column inside the first sleeve 2 or the second sleeve 6.

[0037] Among them, the connection between the first sleeve 2 and the second sleeve 6 is detachable. When the first sleeve 2 and the second sleeve 6 are connected, the first sleeve 2 is sleeved outside the second sleeve 6, and the bottom opening of the second sleeve 6 is exposed at the bottom opening of the first sleeve 2 so that a pile column with a smaller pile diameter can pass through the bottom opening of the first sleeve 2 and extend into the second sleeve 6 from the bottom opening of the second sleeve 6.

[0038] During the construction process, if a pile column with a larger pile diameter needs to be used, the connection between the first sleeve 2 and the second sleeve 6 can be released, the second sleeve 6 can be taken out of the first sleeve 2, and the first sleeve 2 can be sleeved outside the pile column with a larger pile diameter, then pile driving can be carried out on the pile column with a larger pile diameter; if a pile column with a smaller pile diameter needs to be used, the second sleeve 6 can be put into the first sleeve 2, the first sleeve 2 and the second sleeve 6 can be connected, and the second sleeve 6 can be sleeved outside the pile column with a smaller pile diameter, then pile driving can be carried out on the pile column with a smaller pile diameter.

[0039] Thus, through the detachable connection between the first sleeve 2 and the second sleeve 6, when switching between pile columns with different pile diameters, only the disassembly and assembly between the first sleeve 2 and the second sleeve 6 need to be carried out, and the second sleeve 6 can be taken out of or put into the first sleeve 2, thereby achieving the purpose of simply and quickly switching the pile diameter, saving labor and time, and improving work efficiency.

[0040] The detachable connection method between the first sleeve 2 and the second sleeve 6 includes snap connection and bolt connection.

[0041] In one or more embodiments, the detachable connection method between the first sleeve 2 and the second sleeve 6 is snap connection, that is: the lower pile cap further includes a plurality of positioning members, the plurality of positioning members are detachably arranged on the side surface of the first sleeve 2, and the ends of the plurality of positioning members can pass through the first sleeve 2 and abut against the outer side of the second sleeve 6.

[0042] Through the arrangement of the plurality of positioning members, the radial positioning of the second sleeve 6 in the first sleeve 2 can be realized, and the radial snap connection of the second sleeve 6 in the first sleeve 2 can be achieved. Through the radial positioning of the second sleeve 6 by the positioning members, the coaxiality between the second sleeve 6 and the first sleeve 2 during the construction process can be ensured, thereby improving the stability of the construction operation using a pile column with a smaller pile diameter; if a pile column with a larger pile diameter needs to be used, the positioning members can be removed from the first sleeve 2.

[0043] Wherein, the plurality of positioning members are preferably evenly distributed along the circumferential direction of the first sleeve 2, and the direction of each positioning member passing through the first sleeve 2 is preferably along the radial direction of the first sleeve 2. Thus, the positioning accuracy of the positioning members for the second sleeve 6 can be further improved.

[0044] Wherein, the positioning member can also be a bolt or a pin shaft 3.

[0045] In one or more embodiments, as Figures 2 - 3 shown, the positioning member includes a pin shaft 3, a positioning hole for the pin shaft 3 to pass through is formed on the side surface of the first sleeve 2, and the pin shaft 3 is detachably connected to the first sleeve 2 through a pin 4.

[0046] Wherein, the height by which the pin shaft 3 protrudes relative to the inner wall of the first sleeve 2 is equal to the difference between the inner diameter of the first sleeve 2 and the outer diameter of the second sleeve 6. At this time, a plurality of pin shafts 3 just abut against the outer wall of the second sleeve 6, completing the positioning of the second sleeve 6.

[0047] Under the fixation of the pin 4, the position where the pin shaft 3 is connected to the first sleeve 2 is relatively fixed. By selecting pin shafts 3 with corresponding lengths to position the second sleeve 6, after connecting the pin shaft 3 to the first sleeve 2, the positioning of the second sleeve 6 can be directly and accurately completed.

[0048] It can be understood that the depths to which the pin shafts 3 with different lengths extend into the first sleeve 2 are different. Therefore, by selecting pin shafts 3 with different lengths, the second sleeve 6 with different specifications (where the specifications mainly refer to the inner diameter and outer diameter of the second sleeve 6) can be limited. Second sleeves 6 with different specifications can be adapted to pile columns with different pile diameters; on this basis, by replacing the second sleeves 6 with different specifications and selecting pin shafts 3 with corresponding lengths based on the specifications of the second sleeve 6, it is possible to switch to more pile columns with different pile diameters, improving the range of pile diameters that this pile cap can adapt to and enhancing the universality of this pile cap.

[0049] Wherein, the cross-sectional shape of the positioning hole is the same as or close to the cross-sectional shape of the pin shaft 3. Thus, the inner wall of the positioning hole limits the pin shaft 3, reducing the skew of the pin shaft 3. Among them, the pin shaft 3 can be a square pin, and the positioning hole can be a square hole adapted to the square pin.

[0050] On this basis, as Figures 1 - 3 shown, the first sleeve 2 can be provided with a thickened part 5 on the outer surface corresponding to the positioning hole, and the thickened part 5 has a through hole for the pin 4 to pass through.

[0051] Through the setting of the thickened part 5, the length of the positioning hole can be specifically increased, reducing the possible skew of the positioning part in the positioning hole, thereby improving the limiting effect of the positioning hole on the positioning part; at the same time, it is convenient for the pin 4 to pass through, improving the convenience of connecting the pin shaft 3 to the first sleeve 2.

[0052] Wherein, the thickened part 5 can be a nearly cylindrical structure, and its side surface has a through hole for the pin 4 to pass through.

[0053] Wherein, the thickened part 5 is preferably integrally provided with the first sleeve 2.

[0054] The number of positioning parts is preferably 3 or more. Specifically, as Figure 3As shown, the number of the positioning members may be four, and the four positioning members are evenly spaced along the circumferential direction of the first sleeve 2, that is, a positioning member is arranged every 90° along the circumferential direction on the first sleeve 2. At this time, a positioning hole is arranged on the first sleeve 2 every 90° along the circumferential direction.

[0055] The four positioning members can stably position the second sleeve 6, improving the stability of the second sleeve 6 within the first sleeve 2.

[0056] In one or more embodiments, as Figures 2 - 3 shown, a plurality of reinforcing plates 7 are provided on the outer side of the second sleeve 6, and the dimension by which the reinforcing plate 7 protrudes outward relative to the second sleeve 6 is less than or equal to the difference between the inner diameter of the first sleeve 2 and the outer diameter of the second sleeve 6, facilitating the second sleeve 6 to penetrate into the first sleeve 2.

[0057] By providing the reinforcing plates 7, the strength of the second sleeve 6 is improved, thereby increasing the service life of the second sleeve 6.

[0058] Each of the reinforcing plates 7 may be a strip-shaped flat plate structure, whose height direction is adapted to the radial direction of the second sleeve 6, and whose length direction is parallel to the axial direction of the second sleeve 6. The plurality of reinforcing plates 7 may be evenly spaced along the circumferential direction of the second sleeve 6 on the outer side of the second sleeve 6, and a space for the positioning member to abut against the second sleeve 6 is left between adjacent reinforcing plates 7. The number of the plurality of reinforcing plates 7 is preferably 3, 4, 5 or more, and specifically may be 6.

[0059] In one or more embodiments, as Figure 2 shown, the top end of the second sleeve 6 has a boss 8, and the boss 8 is in front of the positioning member facing the upper pile cap 1 (as Figure 2 shown, when the upper pile cap 1 is above the positioning member, the boss 8 is above the positioning member). At this time, the positioning member can block the boss 8, preventing the second sleeve 6 from sliding out of the first sleeve 2.

[0060] Among them, the boss 8 is an annular structure arranged along the circumferential direction of the second sleeve 6, thereby improving the strength of the top end of the second sleeve 6, further increasing the service life of the second sleeve 6, and at the same time ensuring that the boss 8 can always be blocked by the positioning member, improving the convenience of placing the second sleeve 6 in the first sleeve 2.

[0061] Alternatively, the boss 8 is an arc-shaped structure arranged along the circumference of the second sleeve 6, and the two reinforcing plates 7 adjacent to the positioning piece are defined as a reinforcing plate 7 group. The arc-shaped structure is arranged or distributed between the two reinforcing plates 7 of one or all of the reinforcing plate 7 groups, and the two ends of the arc-shaped structure are connected to the two reinforcing plates 7 of the corresponding reinforcing plate 7 groups, thereby the boss 8 cooperates with the corresponding two reinforcing plates 7 to form an approximately "冂"-shaped structure, and the positioning piece between the two reinforcing plates 7 of the corresponding reinforcing plate 7 group is always blocked at the bottom of the boss 8 under the restriction of the corresponding two reinforcing plates 7, thereby ensuring that the boss 8 can always be blocked by the positioning piece. On this basis, the material required for arranging the boss 8 can be reduced.

[0062] In one or more embodiments, Figure 2 As shown, the bottom ends of the first sleeve 2 and the second sleeve 6 are respectively provided with a bell mouth structure 9 with an outwardly expanded diameter, so as to facilitate guiding the top end of the corresponding pile column from the bottom end opening of the first sleeve 2 or the second sleeve 6 into the corresponding sleeve through the bell mouth structure 9.

[0063] Example 2

[0064] A piling system comprises a plurality of pile columns and a diameter-variable pile cap as described in Example 1.

[0065] The pile diameters of the plurality of pile columns are different from each other, the variable diameter pile cap comprises the first sleeve 2 and a plurality of the second sleeves 6, the first sleeve 2 can be detachably connected to any of the second sleeves 6; the first sleeve 2 is adapted to the pile column with the largest pile diameter among the plurality of pile columns, a plurality of the second sleeves 6 correspond one-to-one to a plurality of the pile columns other than the pile column with the largest pile diameter, and the corresponding second sleeves 6 are adapted to the pile columns.

[0066] Through the cooperation of the first sleeve 2 and a plurality of second sleeves 6, the variable diameter pile cap can be applied to the piling operation of piles with different pile diameters through the first sleeve 2 or the second sleeve 6, and has a large pile diameter adaptation range. When switching piles with different pile diameters, it is only necessary to disassemble and assemble the first sleeve 2 and the second sleeve 6, and take the second sleeve 6 out of or put it into the first sleeve 2, thereby achieving the purpose of simple and rapid switching of pile diameters, saving labor and time, and improving work efficiency.

[0067] When the first sleeve 2 uses the pin 3 to clamp and position different second sleeves 6, a corresponding set of pins 3 can be designed for each second sleeve 6. The pins 3 in each set of pins 3 have different lengths, which can clamp and position the corresponding second sleeve 6.

[0068] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A variable diameter pile cap, comprising an upper pile cap (1) and a lower pile cap, characterized in that: The lower pile cap comprises a first sleeve (2) and a second sleeve (6), and the first sleeve (2) is connected to the upper pile cap (1); The first sleeve (2) and the second sleeve (6) are detachably connected; When the first sleeve (2) and the second sleeve (6) are connected, the first sleeve (2) is sleeved outside the second sleeve (6).

2. A diameter-adjustable pile cap according to claim 1, characterized in that: The lower pile cap further comprises a plurality of positioning members, which are detachably arranged on the side of the first sleeve (2), and the ends of the plurality of positioning members can pass through the first sleeve (2) and abut against the outer side of the second sleeve (6).

3. A diameter-variable pile cap according to claim 2, characterized in that: The positioning member comprises a pin shaft (3); a positioning hole for the pin shaft (3) to pass through is opened on the side surface of the first sleeve (2); the pin shaft (3) is detachably connected to the first sleeve (2) via a pin (4).

4. A diameter-variable pile cap according to claim 3, characterized in that: The first sleeve (2) is provided with a thickened portion (5) on the outer surface corresponding to the positioning hole, and the thickened portion (5) has a through hole for the pin (4) to pass through.

5. The variable diameter pile cap according to claim 2, characterized in that: The number of the positioning members is four, and the four positioning members are evenly spaced and distributed around the circumference of the first sleeve (2).

6. The variable diameter pile cap according to claim 2, characterized in that: A plurality of reinforcing plates (7) are provided on the outer side of the second sleeve (6).

7. The variable diameter pile cap according to claim 6, characterized in that: The top end of the second sleeve (6) is provided with a boss (8), and the boss (8) is located in front of the positioning member facing the upper pile cap (1).

8. The variable diameter pile cap according to claim 7, characterized in that: The boss (8) is an annular structure arranged along the circumference of the second sleeve (6); Alternatively, the boss (8) is an arc-shaped structure arranged along the circumference of the second sleeve (6), and the two reinforcing plates (7) adjacent to the positioning member are defined as a reinforcing plate (7) group, the arc-shaped structure is arranged between the two reinforcing plates (7) of the reinforcing plate (7) group, and the two ends of the arc-shaped structure are connected to the two reinforcing plates (7) corresponding to the reinforcing plate (7) group.

9. The variable diameter pile cap according to claim 1, characterized in that: The bottom ends of the first sleeve (2) and the second sleeve (6) are provided with bell-mouth structures (9) that expand outwards.

10. A piling system, characterized in that: It comprises a plurality of piles and a variable diameter pile cap as claimed in any one of claims 1 to 9; The pile diameters of the plurality of piles are different from each other; The variable diameter pile cap comprises the first sleeve (2) and a plurality of the second sleeves (6), and the first sleeve (2) can be detachably connected to any one of the second sleeves (6); The first sleeve (2) is adapted to the pile with the largest pile diameter among the plurality of piles, and the plurality of second sleeves (6) correspond one-to-one to the plurality of piles other than the pile with the largest pile diameter, and the corresponding second sleeves (6) are adapted to the piles.

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