A pile foundation structure and a construction method thereof

Abstract

The application relates to a pile foundation structure and a construction method thereof and relates to the technical field of building foundation construction. The pile foundation structure comprises a pile cap and foundation piles connected with the pile cap, the foundation piles are in a hollow and through-end cylinder shape, a mounting hole is arranged through the radial direction of the foundation piles on the outer circumferential wall of the foundation piles, an inserting rod is slidably connected to the inner side wall of the mounting hole, the end of the inserting rod away from the axis of the foundation pile is used for inserting into the soil layer, an installation rod is arranged in the foundation pile, the installation rod is provided with a driving rod, the lower surface of the driving rod is obliquely provided with a driving surface, and the driving surface is used for abutting against the upper surface of the end of the inserting rod close to the axis of the foundation pile. The installation rod is moved downward, the installation rod drives the driving rod to move downward, the driving rod drives the inserting rod to move, the inserting rod is inserted into the soil layer outside the foundation pile, the downward movement of the foundation pile is limited, the possibility of the foundation pile sinking after force is applied to the foundation pile is reduced, and the stability of the pile foundation structure is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of building foundation construction, and particularly relates to a pile foundation structure and a construction method thereof. BACKGROUND

[0002] The pile foundation, namely, the pile foundation, generally comprises a pile and a pile cap connected to the upper end of the pile. According to the construction method of the pile, the pile foundation can be divided into two categories: precast pile foundation and cast-in-place pile foundation.

[0003] For the precast pile foundation, in order to facilitate the pile sinking construction, the outer peripheral wall of the pile is generally smooth to reduce the resistance of the pile sinking. However, due to the smooth outer peripheral wall of the pile, the friction between the pile inserted into the ground and the soil layer is small, which easily causes the pile to sink after being stressed, and the stability of the pile foundation is poor, which needs to be improved. SUMMARY

[0004] The purpose of the present application is to provide a pile foundation structure and a construction method thereof to improve the problem that the pile sinks after the pile sinking is completed, so as to improve the stability of the pile foundation.

[0005] In a first aspect, the present application provides a pile foundation structure using the following technical scheme:

[0006] A pile foundation structure comprises a pile cap and a pile connected to the pile cap, the pile is in a hollow cylinder shape with both ends penetrating through; the outer peripheral wall of the pile is provided with a mounting hole penetrating through along the radial direction of the pile, the inner side wall of the mounting hole is slidably connected with an inserting rod, one end of the inserting rod away from the axis of the pile is used for inserting into the soil layer; the pile is provided with a mounting rod, the mounting rod is provided with a driving rod, the lower surface of the driving rod is obliquely provided with a driving surface, and the driving surface is used for abutting against the upper surface of one end of the inserting rod close to the axis of the pile.

[0007] By using the above technical scheme, when the pile sinks, the inserting rod is retracted into the mounting hole to reduce the possibility that the inserting rod contacts with the soil layer and causes the pile to be difficult to sink. After the pile sinking is completed, the mounting rod is pushed downward, the driving rod is driven to move downward by the mounting rod, the driving surface abuts against the upper surface of the inserting rod, so that the inserting rod is inserted into the soil layer outside the pile to limit the downward movement of the pile, which is beneficial to reduce the possibility that the pile sinks after being stressed, thereby improving the stability of the pile foundation structure.

[0008] Optionally, the mounting rod is provided with a fixing rod, the fixing rod is provided with a fixing block; the upper surface of the inserting rod is provided with a fixing hole used for inserting and cooperating with the fixing block; when the fixing block is inserted into the fixing hole, one end of the inserting rod away from the axis of the pile is located in the mounting hole; the mounting rod and the pile are connected with a fixing assembly used for fixing the mounting rod.

[0009] By adopting the technical scheme, on the one hand, during the pile sinking construction, the inserting rod is retracted into the installation hole, the fixing block is inserted into the fixing hole, and then the installation rod is fixed by the fixing assembly to fix the inserting rod, so that the possibility that the inserting rod is extended out of the installation hole during the pile sinking process and causes the difficulty in sinking the foundation pile can be reduced. On the other hand, during the transportation of the foundation pile, the fixing block is inserted into the fixing hole to fix the inserting rod, which is beneficial to reduce the risk of disengagement of the inserting rod from the installation hole, and meanwhile, the inserting rod is located in the installation hole to ensure the smoothness of the pile body of the foundation pile, thereby facilitating the mutual stacking and piling of the plurality of foundation piles.

[0010] Optionally, the fixing assembly comprises a fixing screw pipe and an abutting screw rod located at each end of the fixing screw pipe, each abutting screw rod is threadedly connected with the inner peripheral wall of the corresponding end of the fixing screw pipe; the fixing screw pipe is connected with the installation rod, and the end walls of the mutually opposite ends of the two abutting screw rods are used for abutting against the inner peripheral wall of the foundation pile.

[0011] By adopting the technical scheme, the abutting screw rod is rotated to move away from the fixing screw pipe, so that the end wall of the end of the abutting screw rod away from the fixing screw pipe abuts against the inner peripheral wall of the foundation pile, thereby fixing the installation rod. The fixing screw pipe cooperates with the two abutting screw rods, and the structure is simple and the operation is convenient.

[0012] Optionally, the abutting screw rod is provided with an abutting ring, a sliding ring is sleeved on the side of the abutting screw rod close to the fixing screw pipe; the sliding ring is rotationally provided with an abutting rod, and the end of the abutting rod away from the sliding ring is used for abutting against the end wall of the fixing screw pipe; the abutting screw rod is provided with a fixing member for fixing the abutting rod.

[0013] By adopting the technical scheme, after the abutting screw rod abuts against the inner peripheral wall of the foundation pile, the sliding ring is slid to abut against the abutting ring; then the abutting rod is rotated to make the end wall of the end of the abutting rod away from the sliding ring abut against the end wall of the fixing screw pipe; finally, the abutting rod is fixed by the fixing member. The abutting rod abuts against the end wall of the fixing screw pipe to limit the movement of the sliding ring towards the fixing screw pipe, thereby limiting the movement of the abutting screw rod towards the fixing screw pipe, which is beneficial to improve the stability of the abutting screw rod abutting against the inner peripheral wall of the foundation pile, thereby improving the stability of the installation rod.

[0014] Optionally, the inner peripheral wall of the foundation pile is provided with a limiting hole for inserting the abutting screw rod.

[0015] By adopting the technical scheme, the abutting screw rod is inserted into the limiting hole, which can limit the sliding of the abutting screw rod along the inner peripheral wall of the foundation pile, thereby further improving the stability of the installation rod in the fixed state.

[0016] Optionally, the mounting rod is provided with a plurality of positioning rods along the circumferential direction of the mounting rod; the inner circumferential wall of the foundation pile at the position of each positioning rod is provided with a positioning groove along the up-down direction; and each positioning rod is in sliding fit with the corresponding positioning groove along the up-down direction.

[0017] By adopting the above technical scheme, the positioning rod and the positioning groove are in sliding fit, which is conducive to limiting the movement of the mounting rod along the radial direction and the circumferential direction of the foundation pile, thereby facilitating the alignment of the fixing block and the fixing hole along the up-down direction, so as to facilitate the insertion of the fixing block into the fixing hole.

[0018] Optionally, the inner side wall of the positioning groove is provided with a gap groove for inserting the positioning rod along the circumferential direction of the foundation pile, and the inner side wall of the lower side of the gap groove is provided with a guide groove for sliding fit with the positioning rod; when the positioning rod is located in the positioning groove, the driving surface is aligned with the upper surface of the inserting rod along the up-down direction.

[0019] By adopting the above technical scheme, after the pile sinking is completed, the mounting rod is lifted upward, and then the mounting rod is rotated, so that the positioning rod moves from the gap groove to the guide groove; then the mounting rod is placed downward again, so that the driving surface abuts against the upper surface of the inserting rod, so that the driving rod moves the inserting rod to the outside of the mounting hole, thereby the inserting rod can be inserted into the soil layer. The positioning rod and the guide groove are in sliding fit, which is conducive to aligning the driving surface and the inserting rod along the up-down direction, and at the same time, the rotation of the mounting rod can be limited, thereby facilitating the guarantee that the driving surface keeps abutting against the inserting rod during the process of pushing the inserting rod by the driving rod. The gap groove connects the guide groove and the positioning groove, which is conducive to reducing the distance of upward movement of the mounting rod, so as to facilitate the movement of the positioning rod into the guide groove and the sliding fit with the guide groove.

[0020] Optionally, the driving rod is provided with an extension rod, and the extension rod is provided with a limiting block for plug-in fit with the fixing hole; when the limiting block is inserted into the fixing hole, the end of the inserting rod away from the axis of the foundation pile is located outside the mounting hole and outside the foundation pile.

[0021] By adopting the above technical scheme, the limiting block and the limiting hole are matched to limit the movement of the inserting rod along the length direction of the mounting hole, thereby facilitating the improvement of the stability of the inserting rod inserted into the soil layer.

[0022] Optionally, the circumferential wall of the mounting rod is provided with a plurality of reinforcing rods, and the end of the reinforcing rod away from the mounting rod extends along the radial direction of the foundation pile; the reinforcing rod is provided with a reinforcing plate, and the thickness direction of the reinforcing plate is along the radial direction of the foundation pile; and the foundation pile is filled with concrete slurry.

[0023] By adopting the above technical solution, the installation rod, the reinforcing rod, and the reinforcing plate work together to form a keel structure, which helps to improve the stability of the solidified concrete structure, thereby increasing the structural strength of the foundation pile and reducing the risk of cracking of the foundation pile due to soil compression. At the same time, the solidified concrete can further fix the insertion rod.

[0024] Secondly, the construction method for the aforementioned pile foundation structure provided in this application adopts the following technical solution:

[0025] A construction method for a pile foundation structure includes the following steps:

[0026] Pile driving: retract the insertion rod into the installation hole; insert the foundation pile into the ground, and make the upper end of the foundation pile protrude above the ground at the pile driving position;

[0027] Moving the insertion rod: Push the installation rod downwards, and the moving drive rod pushes the insertion rod, so that the end of the insertion rod away from the axis of the foundation pile moves out of the installation hole and is inserted into the soil layer;

[0028] Construction of pile cap: The pile cap is poured, and the upper end of the foundation pile is located inside the pile cap.

[0029] By adopting the above technical solution, the insertion rod is inserted into the soil layer outside the pile, which can restrict the downward movement of the pile, reduce the possibility of the pile sinking after being stressed, and thus improve the stability of the pile foundation structure.

[0030] In summary, this application includes at least one of the following beneficial technical effects:

[0031] 1. After the pile driving is completed, the installation rod is pushed downwards. The installation rod drives the drive rod to move downwards so that the drive surface abuts against the upper surface of the insertion rod, thereby inserting the insertion rod into the soil layer outside the pile. This restricts the downward movement of the pile, which helps to reduce the possibility of the pile sinking under stress, thus improving the stability of the pile foundation structure.

[0032] 2. The abutting rod abuts against the end wall of the fixed screw tube to restrict the movement of the sliding ring towards the fixed screw tube, thereby restricting the movement of the abutting screw rod towards the fixed screw tube. This helps to improve the stability of the abutting screw rod in abutting against the inner circumferential wall of the foundation pile, thereby improving the stability of the installation rod fixing.

[0033] 3. The clearance groove connects the guide groove and the positioning groove, which helps to reduce the upward movement distance of the mounting rod, so that the positioning rod can move into the guide groove and slide and cooperate with the guide groove. This also helps to align the driving surface with the insertion rod in the vertical direction, and at the same time, it can restrict the rotation of the mounting rod, thus ensuring that the driving surface always remains in contact with the insertion rod during the process of the driving rod pushing the insertion rod. Attached Figure Description

[0034] Figure 1 is a schematic diagram of a pile foundation structure according to an embodiment of the present application.

[0035] Figure 2 is a schematic diagram of a sectional view of the pile foundation structure.

[0036] Figure 3 is a schematic diagram of a sectional view of the pile foundation structure. Figure 2 is an enlarged view of part A in

[0037] Figure 4 is an enlarged view of part B in Figure 2

[0038] Figure 5 is a schematic diagram of a state in which the driving block is aligned with the insertion block.

[0039] Figure 6 is a schematic diagram of a state in which the limiting block is inserted into the fixing hole.

[0040] In the drawings, 1 is a pile cap, 2 is a pile, 21 is a mounting hole, 22 is an insertion rod, 221 is a fixing hole, 222 is an abutting surface, 23 is a sliding groove, 24 is a mounting groove, 25 is a positioning groove, 26 is a limiting hole, 27 is a clearance groove, 28 is a guide groove, 3 is a mounting rod, 31 is a fixing rod, 311 is a fixing block, 32 is a positioning rod, 33 is a connecting hole, 34 is a driving rod, 341 is a driving surface, 342 is an extension rod, 3421 is a limiting block, 35 is a reinforcing rod, 351 is a reinforcing plate, 4 is a fixing assembly, 41 is a fixing screw pipe, 42 is an abutting screw rod, 421 is an abutting ring, 422 is a sliding ring, 4221 is an abutting rod, and 423 is a fixing member. DETAILED DESCRIPTION

[0041] The following will be described in detail with reference to the accompanying drawings. Figure 1 - the accompanying drawings Figure 6 The present application will be described in further detail.

[0042] A pile foundation structure, referring to Figure 1 , includes a pile cap 1 and piles 2, and the number of piles 2 is multiple. One end of each pile 2 is connected to the pile cap 1, and the other end extends downward and is inserted into the ground below to support the pile cap 1, thereby improving the stability of a building constructed on the upper surface of the pile cap 1.

[0043] Referring to Figure 1 and Figure 2 ​, the foundation pile 2 is a prefabricated pile; the foundation pile 2 is in a hollow cylinder shape with both ends penetrating. The outer peripheral wall of the foundation pile 2 is integrally formed with penetrating mounting holes 21, the mounting holes 21 are sequentially and spacedly arranged in multiple groups along the length direction of the foundation pile 2, the number of the mounting holes 21 in each group is multiple, and the number of the mounting holes 21 in each group is equal; all the mounting holes 21 in each group are sequentially and spacedly arranged along the circumferential direction of the foundation pile 2. The mounting holes 21 in any two adjacent groups correspond to each other, and each mounting hole 21 is aligned with the corresponding mounting hole 21 in another group in the up-down direction. The length direction of each mounting hole 21 is arranged along the radial direction of the foundation pile 2, and the inner side wall of each mounting hole 21 is slidably connected with an inserted rod 22.

[0044] Referring to Figure 2 , the foundation pile 2 is provided with a mounting rod 3, and the peripheral wall of the mounting rod 3 is welded and fixed with multiple fixing rods 31. The fixing rods 31 are sequentially arranged in multiple groups along the length direction of the mounting rod 3, the fixing rods 31 in each group are sequentially and uniformly spacedly distributed along the circumferential direction of the foundation pile 2, and the number of the fixing rods 31 in each group is the same as the number of the inserted rods 22 in each group. The fixing rods 31 in any two adjacent groups correspond to each other, and each fixing rod 31 is aligned with the corresponding fixing rod 31 in another group in the up-down direction.

[0045] Referring to Figure 2 and Figure 3 , the mounting rod 3 is provided with a positioning rod 32, and the number of the positioning rod 32 is the same as that of the fixing rod 31; the positioning rod 32 corresponds to the fixing rod 31 one by one, and each positioning rod 32 is integrally connected with the end of the corresponding fixing rod 31 away from the mounting rod 3. The inner peripheral wall of the foundation pile 2 is integrally formed with a sliding groove 23 in the up-down direction, and the inner side wall of the sliding groove 23 is connected with the top wall of the foundation pile 2. The sliding groove 23 corresponds to the positioning rod 32 in any one group of positioning rods 32 one by one; the end of each positioning rod 32 away from the mounting rod 3 is located in the corresponding sliding groove 23, and the positioning rod 32 is slidably connected with the inner side wall of the corresponding sliding groove 23 in the up-down direction, so as to align the spacing between each fixing rod 31 and the adjacent two inserted rods 22 in each group of inserted rods 22 in the up-down direction, so that the fixing rod 31 passes through the spacing between the corresponding adjacent two inserted rods 22 and moves downward. The fixing rod 31 corresponds to the inserted rod 22 one by one; moving the mounting rod 3 downward can move each fixing rod 31 to a position above one side of the corresponding inserted rod 22. In another embodiment, the positioning rod 32 can also be directly welded and fixed with the peripheral wall of the mounting rod 3.

[0046] Referring to Figure 3The inner side wall of the position of each positioning rod 32 is integrally formed with a mounting groove 24 along the circumference of the pile 2, and the inner side wall of the mounting groove 24 is integrally formed with a positioning groove 25 along the up-down direction. By rotating the mounting rod 3, each positioning rod 32 can be moved into the corresponding positioning groove 25 from the corresponding mounting groove 24, so that each fixed rod 31 can be moved to a position directly above the corresponding insertion rod 22.

[0047] Referring to Figure 2 and Figure 3 The lower surface of each fixed rod 31 is welded with a fixed block 311; and the upper surface of one end of each insertion rod 22 close to the axis of the pile 2 is downwardly provided with a fixed hole 221. When the end wall of the insertion rod 22 away from the axis of the pile 2 is located in the mounting hole 21, the fixed hole 221 is aligned with the fixed block 311 on the corresponding fixed rod 31, so that the fixed block 311 is inserted into the fixed hole 221 to fix the insertion rod 22. The upper end of the mounting rod 3 and the pile 2 are provided with a fixing assembly 4 for fixing the mounting rod 3, so that the fixed block 311 and the corresponding fixed hole 221 remain in a plug-in cooperation state, thereby improving the stability of the insertion rod 22 and facilitating the pile sinking construction of the pile 2.

[0048] Referring to Figure 2 and Figure 4 The fixing assembly 4 includes a fixed screw pipe 41 and two abutting screw rods 42. The circumferential wall of the upper end of the mounting rod 3 is provided with a connecting hole 33 along the radial direction of the pile 2; the fixed screw pipe 41 is inserted through the connecting hole 33, and the outer circumferential wall of the fixed screw pipe 41 is welded with the inner circumferential wall of the connecting hole 33. One of the abutting screw rods 42 is threadedly connected with the inner circumferential wall of one end of the fixed screw pipe 41, and the other abutting screw rod 42 is threadedly connected with the inner circumferential wall of the other end of the fixed screw pipe 41. The inner circumferential wall of the pile 2 in the direction of the end wall of each abutting screw rod 42 is integrally formed with a limiting hole 26, and the limiting hole 26 is aligned with the corresponding abutting screw rod 42 along the radial direction of the pile 2; by rotating the abutting screw rod 42, the end of the abutting screw rod 42 away from the fixed screw pipe 41 can be inserted into the corresponding limiting hole 26 to limit the movement of the mounting rod 3 along the circumferential direction or the axial direction of the pile 2, thereby fixing the mounting rod 3. In another embodiment, the end wall of the abutting screw rod 42 can also directly abut with the inner circumferential wall of the pile 2 to achieve the effect of fixing the mounting rod 3.

[0049] Referring to Figure 4The outer circumferential wall of the abutting screw 42 is provided with an abutting ring 421 and a sliding ring 422. The inner circumferential wall of the abutting ring 421 is welded to the outer circumferential wall of the end of the abutting screw 42 away from the fixed screw pipe 41. The sliding ring 422 is sleeved on the outer circumferential wall of the abutting screw 42 and can slide along the axial direction of the abutting screw 42. The sliding ring 422 is located on the side of the abutting ring 421 close to the fixed screw pipe 41. The abutting rod 4221 is rotationally connected to the sliding ring 422 through a rotating shaft. The rotating shaft of the abutting rod 4221 is arranged in the radial direction of the sliding ring 422. After the abutting screw 42 is inserted into the limiting hole 26, the sliding ring 422 is slid to abut against the abutting ring 421. Then, the abutting rod 4221 is rotated away from the abutting ring 421. The end of the abutting rod 4221 away from the sliding ring 422 can abut against the end wall of the fixed screw pipe 41 to limit the movement of the abutting ring 421 towards the fixed screw pipe 41, thereby reducing the possibility of the abutting screw 42 reversing and separating from the limiting hole 26.

[0050] With reference to Figure 4 The abutting screw 42 is provided with a fixing member 423 including a metal strip. The abutting rod 4221 is bound to the abutting screw 42 by the fixing member 423 so that the abutting rod 4221 abuts against the end wall of the fixed screw pipe 41. In another embodiment, the fixing member 423 can also be a hoop or other structure capable of abutting the abutting rod 4221 against the end wall of the fixed screw pipe 41.

[0051] With reference to Figure 3 and Figure 5 The circumferential wall of the mounting rod 3 is welded to a plurality of driving rods 34. The driving rods 34 correspond to the fixed rods 31 one by one. Each driving rod 34 and the corresponding fixed rod 31 are spaced apart along the circumferential direction of the mounting rod 3. The inner side wall of the positioning groove 25 is integrally formed with a clearance groove 27 along the axial direction of the pile 2. The inner side wall of the lower side of the clearance groove 27 is integrally formed with a guide groove 28 downward. After the pile 2 is completed, the mounting rod 3 is lifted upward to align the positioning rod 32 with the clearance groove 27. Then, the mounting rod 3 is rotated so that the positioning rod 32 moves from the clearance groove 27 to the guide groove 28, so that each driving rod 34 moves to a position directly above the corresponding insertion rod 22.

[0052] With reference to Figure 5 and Figure 6The lower surface of each driving rod 34 away from the one end of the mounting rod 3 is obliquely provided with a driving surface 341; the upper surface of the inserting rod 22 close to the one end of the mounting rod 3 is obliquely provided with a fitting surface 222, and the fitting surface 222 is aligned with the driving surface 341. The mounting rod 3 is moved downward, and the mounting rod 3 can drive the driving rod 34 to move downward, so that the driving surface 341 is fitted with the fitting surface 222, thereby the inserting rod 22 can be driven to move away from the axis direction of the pile 2, so that the one end of the inserting rod 22 away from the axis of the pile 2 is moved out to the outside of the mounting hole 21 to be inserted into the soil layer, so as to improve the stability of the pile 2. In the embodiment, the one end of the inserting rod 22 away from the axis of the pile 2 is tapered.

[0053] With reference to Figure 6 The upper surface of the driving rod 34 is welded and fixed with an extension rod 342, and the lower surface of the extension rod 342 is integrally formed with a limiting block 3421. When the end wall of the driving rod 34 away from the one end of the mounting rod 3 abuts against the end wall of the inserting rod 22, the limiting block 3421 is aligned with the fixing hole 221, so that the limiting block 3421 is inserted into the fixing hole 221, thereby fixing the inserting rod 22.

[0054] With reference to Figure 2 and Figure 6 The peripheral wall of the mounting rod 3 is welded and fixed with a plurality of reinforcing rods 35, and the length direction of the reinforcing rod 35 is arranged along the radial direction of the pile 2. The reinforcing rod 35 is sleeved with a reinforcing plate 351, and the reinforcing plate 351 is welded and fixed with the reinforcing rod 35; the thickness direction of the reinforcing plate 351 is arranged along the length direction of the reinforcing rod 35. After the limiting block 3421 is inserted into the fixing hole 221, the concrete slurry is poured into the pile 2, so as to further improve the stability of the inserting rod 22, and meanwhile, it is beneficial to improve the structural strength of the pile 2 and reduce the possibility of cracking of the pile 2 due to the extrusion of the soil layer.

[0055] The embodiment also discloses a construction method of the pile foundation structure, and the construction method comprises the following construction steps:

[0056] S1, the inserting rod 22 is retracted into the mounting hole 21, and the fixed block 311 is inserted and matched with the fixing hole 221 to fix the inserting rod 22; the mounting rod 3 is fixed by the fixing assembly 4;

[0057] S2, the pile 2 is transported to the construction site; the lower end of the pile 2 is inserted into the specified position by the static pressure method, and meanwhile, the upper end of the pile 2 is exposed to the ground;

[0058] S3, the inserting rod 22 is moved:

[0059] S31, the fixing assembly 4 is loosened, the mounting rod 3 is lifted by the crane; the mounting rod 3 is rotated, so that the positioning rod 32 is moved into the guide groove 28;

[0060] S32, press the installation rod 3 downward by the hydraulic machine, so that the driving rod 34 drives the insertion rod 22 to move, and the insertion rod 22 is inserted into the soil layer around the pile 2 from the end of the axis of the pile 2, and the limiting block 3421 is inserted into the fixing hole 221;

[0061] S33, fix the installation rod 3 by the fixing assembly 4;

[0062] S34, pour the concrete slurry into the pile 2, and vibrate the concrete slurry by the vibrating device;

[0063] S4, construct the pile cap 1;

[0064] S41, lay the steel mesh above the pile 2, and connect the steel bars in the installation rod 3 or the pile 2 with the steel mesh laid on the ground by the steel bars;

[0065] S42, pour the concrete and vibrate it, and wait until the concrete of the pile cap 1 is solidified.

[0066] In the embodiment, the concrete in the pile 2 is solidified before the construction of the pile cap 1. In another embodiment, the concrete in the pile 2 can be poured and constructed synchronously with the concrete of the pile cap 1.

[0067] The embodiments of the specific embodiments are the preferred embodiments of the application, and are not limited to the protection scope of the application, wherein the same parts are indicated by the same reference numerals. Therefore, any equivalent changes made according to the structure, shape, principle of the application should be covered in the protection scope of the application.

Claims

1. A pile foundation structure comprising a pile cap (1) and foundation piles (2) connected to the pile cap (1), characterized in that: The pile (2) is hollow inside and through both ends; the outer peripheral wall of the pile (2) is provided with a mounting hole (21) penetrating in the radial direction of the pile (2), the inner side wall of the mounting hole (21) is slidably connected with an inserted rod (22), one end of the inserted rod (22) away from the axis of the pile (2) is used for inserting into the soil layer; the pile (2) is provided with a mounting rod (3), the mounting rod (3) is provided with a driving rod (34), the lower surface of the driving rod (34) is obliquely provided with a driving surface (341), the driving surface (341) is used for abutting with the upper surface of one end of the inserted rod (22) close to the axis of the pile (2). The mounting rod (3) is provided with a fixed rod (31), the fixed rod (31) is provided with a fixed block (311); the upper surface of the inserted rod (22) is provided with a fixed hole (221) used for plug-in cooperation with the fixed block (311); when the fixed block (311) is inserted into the fixed hole (221), one end of the inserted rod (22) away from the axis of the pile (2) is located in the mounting hole (21); the mounting rod (3) and the pile (2) are connected with a fixing assembly (4) used for fixing the mounting rod (3); The fixing assembly (4) comprises a fixed screw pipe (41) and an abutting screw rod (42) located at each end of the fixed screw pipe (41), each abutting screw rod (42) is threadedly connected with the inner peripheral wall of the corresponding end of the fixed screw pipe (41); the fixed screw pipe (41) is connected with the mounting rod (3), and the end walls of the mutually opposite ends of the two abutting screw rods (42) are used for abutting with the inner peripheral wall of the pile (2).

2. A pile foundation structure according to claim 1, characterised in that: The abutting screw rod (42) is provided with an abutting ring (421), the abutting screw rod (42) located on one side of the abutting ring (421) close to the fixed screw pipe (41) is sleeved with a sliding ring (422); the sliding ring (422) is rotationally provided with an abutting rod (4221), one end of the abutting rod (4221) away from the sliding ring (422) is used for abutting with the end wall of the fixed screw pipe (41); the abutting screw rod (42) is provided with a fixing piece (423) used for fixing the abutting rod (4221).

3. A pile foundation structure according to claim 1, characterised in that: The inner peripheral wall of the pile (2) is provided with a limiting hole (26) for inserting the abutting screw rod (42).

4. A pile foundation structure according to claim 1, characterised in that: The mounting rod (3) is provided with a plurality of positioning rods (32) along the circumferential direction thereof; the inner peripheral wall of the pile (2) at the position of each positioning rod (32) is provided with a positioning groove (25) in the up-down direction; each positioning rod (32) is slidably matched with the corresponding positioning groove (25) in the up-down direction.

5. A pile foundation structure according to claim 4, characterised in that: The inner side wall of the positioning groove (25) is provided with a give-way groove (27) for inserting the positioning rod (32) along the circumferential direction of the pile (2), the lower inner side wall of the give-way groove (27) is downwardly provided with a guide groove (28) used for slidably matching with the positioning rod (32); when the positioning rod (32) is located in the positioning groove (25), the driving surface (341) is aligned with the inserted rod (22) in the up-down direction.

6. A pile foundation structure according to claim 1, characterised in that: The driving rod (34) is provided with an extension rod (342) provided with a limiting block (3421) for plug fitting with the fixing hole (221); when the limiting block (3421) is inserted into the fixing hole (221), the end of the insertion rod (22) away from the axis of the pile (2) is located outside the mounting hole (21) and outside the pile (2).

7. A pile foundation structure according to claim 6, characterised in that: The peripheral wall of the mounting rod (3) is provided with a plurality of reinforcing rods (35) extending away from the mounting rod (3) in the radial direction of the pile (2); the reinforcing rod (35) is provided with a reinforcing plate (351) whose thickness direction is arranged in the radial direction of the pile (2); the pile (2) is filled with concrete slurry.

8. A method of constructing a pile foundation structure as claimed in any one of claims 1 to 7, characterised in that: The method comprises the following steps: Pile sinking: the insertion rod (22) is retracted into the mounting hole (21); the pile (2) is inserted into the ground, and the upper end of the pile (2) protrudes above the ground surface of the pile sinking position; Moving the insertion rod (22): pushing the mounting rod (3) downward, moving the driving rod (34) to push the insertion rod (22), so that the end of the insertion rod (22) away from the axis of the pile (2) moves out of the mounting hole (21) and is inserted into the soil layer; Constructing the pile cap (1): pouring the pile cap (1), and locating the upper end of the pile (2) inside the pile cap (1).

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