Pile foundation fixing device for constructional engineering

Abstract

The invention discloses a pile foundation fixing device for constructional engineering, and belongs to the technical field of pile foundations, the pile foundation fixing device comprises a plurality of second hard soil layer pouring assemblies poured in a hard soil layer, and the second hard soil layer pouring assemblies are sleeved with first hard soil layer pouring assemblies poured in a soft soil layer; the top of the first hard soil layer pouring assembly is connected with a first steel reinforcement cage embedded in a soft soil layer, and a first pouring pile is poured in the soft soil layer corresponding to the first steel reinforcement cage. Due to the fact that the upper-layer structure is supported by the surface layer and the hard soil layer surface layer, the sinking speed of the upper-layer structure is smaller than that of the lower-layer structure, the height of the low bearing platform can be prevented from being changed to a certain extent when sinking occurs, the building pile foundation can be fixedly connected with the ground, the stability of the building pile foundation is higher, and the service life of the building pile foundation is prolonged. And the influence on the building pile foundation during other building operations is prevented.

Description

Technical Field

[0001] The invention belongs to the technical field of pile foundations, and in particular relates to a pile foundation fixing device for construction engineering. Background Art

[0002] The pile foundation consists of a foundation pile and a cap connected to the top of the pile. If the pile body is completely buried in the soil and the bottom of the cap is in contact with the soil, it is called a low cap pile foundation. If the upper part of the pile body is exposed to the ground and the bottom of the cap is above the ground, it is called a high cap pile foundation. The building pile foundation is usually a low cap pile foundation. The low cap pile foundation mainly adopts a series of methods such as static pressure, water sinking, vibration, and hammering at the construction site to drive the corresponding foundation piles into the ground. These methods ensure that the pile foundation can be firmly fixed in the soil, thereby supporting the upper structure.

[0003] Some invention patents in the field of pile foundation technology are disclosed in the prior art, among which the invention patent with publication number CN116464049B discloses a pile foundation fixing device for construction engineering, which relates to the field of construction engineering technology, and includes a base plate, the bottom of the base plate is rotatably connected to a universal wheel through a bearing, the top of the base plate is fixedly connected to a vertical pole, the top of the vertical pole is fixedly connected to a positioning frame, a positioning hole is opened on the right side of the base plate, and also includes: a clamping component, the clamping component includes a rotating wheel, the rotating wheel is rotatably connected to the positioning frame through a bearing, and the surface of the rotating wheel is fixedly connected to a rotating frame. The present invention is provided with a clamping component above the base plate, and the end of the pile foundation is clamped and fixed by the clamping component. After the pile foundation is fixed inside the clamping block, the clamping component is moved upward by the hydraulic rod, so that the clamping block moves to the top of the positioning frame and corresponds to the positioning hole. A sliding component is provided inside the clamping block. When the clamping blocks are squeezed close to each other, the sliding component will contact the surface of the pile foundation. This technical solution still has some shortcomings in the process of application. The existing pile foundation is prone to sinking after pouring, resulting in insufficient stability of the pile foundation structure. In the event of an accident, the pile foundation is easily damaged, which will affect the stability of the building and the safety of use.

[0004] Based on this, the present invention designs a pile foundation fixing device for construction engineering to solve the above problems. Summary of the invention

[0005] The purpose of the present invention is to propose a pile foundation fixing device for construction engineering in order to solve the problem that the existing pile foundation is prone to sinking after pouring, resulting in insufficient stability of the pile foundation structure and easy damage to the pile foundation in the event of an accident, which in turn affects the stability of the building and the safety of use.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] A pile foundation fixing device for construction engineering comprises a plurality of second hard soil layer casting components cast in a hard soil layer, a first hard soil layer casting component cast in a soft soil layer is sleeved on the second hard soil layer casting components, a first steel cage embedded in the soft soil layer is connected to the top of the first hard soil layer casting component, first casting piles are cast in the soft soil layer corresponding to the first steel cage, and a low cap is cast on the ground corresponding to the plurality of first casting piles.

[0008] As a further description of the above technical solution:

[0009] The first hard soil layer casting assembly includes a second steel cage connected to the bottom of the first steel cage, a second casting pile is cast in the soft soil layer corresponding to the second steel cage, an orientation groove is reserved at the bottom of the second casting pile, and an orientation cylinder is rotatably connected in the orientation groove.

[0010] As a further description of the above technical solution:

[0011] A regular polygonal groove is provided at the bottom of the directional cylinder, and multiple faces of the regular polygonal groove are connected to multiple fixed teeth arranged in a linear manner. The bottom ends of multiple vertical steel bars of the second steel cage are provided with embedded grooves.

[0012] As a further description of the above technical solution:

[0013] The second hard soil layer casting assembly includes a third steel cage sleeved in a plurality of embedded grooves, a third casting pile is cast in the hard soil layer corresponding to the third steel cage, a one-way support is connected to the top of the third casting pile corresponding to the regular polygonal groove, which is used to self-adjust the support height when the hard soil layer sinks, and a counterweight base is provided at the bottom of the third casting pile for adding weight.

[0014] As a further description of the above technical solution:

[0015] The one-way support member includes a directional pile sleeved in a regular polygonal groove, the bottom of the directional pile is connected to the top of a third cast pile, the directional pile is connected to a plurality of groups of movable teeth corresponding to the plurality of groups of fixed teeth, limiting grooves are provided at the corners of the connecting surface between the movable teeth and the directional pile, the corresponding limiting grooves on the directional pile are connected to a limiting seat, a one-way rotating shaft is rotatably connected in the limiting seat, the end of the one-way rotating shaft is connected to the movable teeth, the other end of the one-way rotating shaft is sleeved with a transfer spring, and the one-way rotating shaft is elastically transferred to the limit seat through the transfer spring.

[0016] As a further description of the above technical solution:

[0017] A plurality of compensating load-bearing components in a circular array are connected between the vertical steel bars of the second steel cage and the vertical steel bars of the third steel cage, for compensating for the supporting strength of the second steel cage, and the compensating weighing component comprises a fixed adapter frame connected to the second steel cage, reinforcing ribs are installed on the inner side of the fixed adapter frame by means of bolts and nuts, and a movable adapter frame is installed on the other end of the reinforcing ribs by means of bolts and nuts, and the movable adapter frame is connected to the third steel cage.

[0018] As a further description of the above technical solution:

[0019] A layered support assembly is provided on the surface of the hard soil layer corresponding to the first steel cage, which is used to expand the support surface between the first cast pile and the surface of the hard soil layer. The layered support assembly includes a link frame, which is connected to the first steel cage and is located on the surface of the hard soil layer. A fourth steel cage is rolled on the circumferential surface of the link frame, and a layered support member is cast on the surface of the hard soil layer corresponding to the fourth steel cage.

[0020] As a further description of the above technical solution:

[0021] The layered support member includes a fourth steel cage cast on the surface of the hard soil layer, wherein a plurality of casting openings in a circular array are opened on the top of the fourth steel cage, a plurality of fifth steel cages are embedded in the corresponding casting openings inside the hard soil layer, and fifth casting piles are cast in the corresponding fifth steel cages inside the hard soil layer, and the same pile foundation combination frame is connected between the plurality of fifth casting piles.

[0022] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0023] 1. In the present invention, a layered structure design is adopted, and the hard soil layer is subjected to the greatest pressure. When the hard soil layer sinks, since the upper structure is supported by the surface layer and the surface layer of the hard soil layer, the sinking speed of the upper structure is less than the sinking speed of the lower structure. Therefore, the counterweight base will drive the directional pile to extend in the directional cylinder through the fourth casting pile. When the movable teeth are subjected to the resistance from the fixed teeth, the movable teeth rotate on the inner side of the limit seat through the one-way rotating shaft, and twist the transfer spring to deform it. When the movable teeth move between two adjacent fixed teeth, the transfer spring starts to perform elastic reset movement. The reset movable teeth and the fixed teeth are re-stuck, which is used to provide an upward support force for the fixed teeth, thereby avoiding to a certain extent the change in the height of the low cap when settlement occurs, and enabling the building pile foundation to be fixedly connected to the ground. The building pile foundation is more stable, and it is prevented from affecting the building pile foundation during other construction operations.

[0024] 2. In the present invention, the fifth steel cage is cast inside the hard soil layer to obtain the first cast pile. On the one hand, the layered support assembly can increase the connection surface between the bottom of the second steel cage and the surface of the hard soil layer, thereby improving the stability of the second cast pile. On the other hand, the fifth cast pile cast by the layered support assembly inside the hard soil layer can improve the load strength of the hard soil layer on the fourth cast pile.

[0025] 3. In the present invention, after the height of the second steel cage is positioned, the directional cylinder is twisted to make the fixed teeth and the movable teeth engage with each other, so it can be adjusted according to the actual excavation depth of the pile foundation pit. It has high flexibility and strong practicality, is suitable for the laying of prefabricated components, and is conducive to speeding up the construction progress. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic diagram of the overall structure of a pile foundation fixing device for construction engineering proposed by the present invention;

[0027] Figure 2 This is a schematic diagram of the structure of a pile foundation fixing device for construction engineering proposed by the present invention after being disassembled;

[0028] Figure 3 A pile foundation fixing device for construction engineering proposed by the present invention Figure 2 The enlarged structural diagram at C in the middle;

[0029] Figure 4 A pile foundation fixing device for construction engineering proposed by the present invention Figure 2 The enlarged structural diagram at D in the middle;

[0030] Figure 5 This is a schematic structural diagram of a one-way support member in a pile foundation fixing device for construction engineering proposed by the present invention;

[0031] Figure 6 A pile foundation fixing device for construction engineering proposed by the present invention Figure 5 The enlarged structural diagram at B in the middle;

[0032] Figure 7 This is a schematic structural diagram of a pile foundation fixing device for construction engineering proposed by the present invention after being disassembled from another perspective;

[0033] Figure 8 A pile foundation fixing device for construction engineering proposed by the present invention Figure 7 The enlarged structural diagram at A in the middle;

[0034] Fig. 9 This is a structural schematic diagram of a pile foundation fixing device for construction engineering proposed by the present invention from another perspective;

[0035] Fig.10This is a schematic structural diagram of a layered support member in a pile foundation fixing device for construction engineering proposed by the present invention;

[0036] Fig.11 This is a schematic structural diagram of a fourth reinforcement cage in a pile foundation fixing device for construction engineering proposed by the present invention.

[0037] Legend:

[0038] 1. Low cap; 2. First steel cage; 3. First casting pile; 4. First hard soil layer casting assembly; 401. Second steel cage; 402. Second casting pile; 403. Embedded groove; 404. Oriented groove; 405. Oriented cylinder; 406. Regular polygonal groove; 407. Fixed teeth; 5. Second hard soil layer casting assembly; 501. Third steel cage; 502. Third casting pile; 503. One-way support; 5031. Oriented pile; 5032. Movable teeth ; 5033, limit seat; 5034, one-way rotating shaft; 5035, transfer spring; 504, counterweight base; 6, compensation load-bearing assembly; 601, fixed transfer frame; 602, movable transfer frame; 603, reinforcement ribs; 7, layered support assembly; 701, link frame; 702, fourth steel cage; 703, layered support; 7031, fourth casting pile; 7032, fifth steel cage; 7033, fifth casting pile; 7034, pile foundation combination frame. DETAILED DESCRIPTION

[0039] 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.

[0040] Please see attached Figure 1 -Attached Fig.11 The present invention provides a technical solution: a pile foundation fixing device for construction engineering, comprising a plurality of second hard soil layer casting components 5 cast in a hard soil layer, a first hard soil layer casting component 4 cast in a soft soil layer is sleeved on the second hard soil layer casting component 5, a first steel cage 2 embedded in the soft soil layer is connected to the top of the first hard soil layer casting component 4, a first casting pile 3 is cast in the soft soil layer corresponding to the first steel cage 2, and a low cap 1 is cast on the ground corresponding to the plurality of first casting piles 3.

[0041] Specifically, the first hard soil layer casting component 4 includes a second steel cage 401 connected to the bottom of the first steel cage 2, and a second casting pile 402 is cast in the soft soil layer corresponding to the second steel cage 401. A directional groove 404 is reserved at the bottom of the second casting pile 402, and a directional cylinder 405 is rotatably connected in the directional groove 404. A regular polygonal groove 406 is opened at the bottom of the directional cylinder 405, and multiple faces of the regular polygonal groove 406 are connected to multiple fixed teeth 407 arranged linearly. The bottom ends of multiple vertical steel bars of the second steel cage 401 are all provided with embedded grooves 403. Then, the first steel cage 2 is laid in the soft soil layer and cast. After the concrete solidifies, the first casting pile 3 is obtained, and finally, it is cast on the surface layer to obtain a low cap. 1, the low cap 1, the first steel cage 2, the first pouring pile 3, the first hard soil layer pouring assembly 4 and the layered support assembly 7 are used as the upper structure, and the second hard soil layer pouring assembly 5 is used as the lower structure. The layered structure design is adopted, and the hard soil layer is subjected to the greatest pressure. When the hard soil layer sinks, since the upper structure is supported by the surface layer and the surface layer of the hard soil layer, the sinking speed of the upper structure is less than the sinking speed of the lower structure. Therefore, the counterweight base 504 will drive the directional pile 5031 to stretch in the directional cylinder 405 through the fourth pouring pile 7031. When the movable teeth 5032 are subjected to the resistance from the fixed teeth 407, the movable teeth 5032 are connected to the limit seat 503 through the one-way rotating shaft 5034. 3, and twist the transfer spring 5035 to deform it. When the movable tooth 5032 moves between two adjacent fixed teeth 407, the transfer spring 5035 starts to perform elastic reset movement. After reset, the movable tooth 5032 and the fixed tooth 407 are re-stuck. The second hard soil layer casting component 5 includes a third steel cage 501 sleeved in a plurality of embedded grooves 403. A third casting pile 502 is cast in the hard soil layer corresponding to the third steel cage 501. The top of the third casting pile 502 is connected to a one-way support member 503 corresponding to the regular polygonal groove 406, which is used for self-adjusting the support height when the hard soil layer sinks. The bottom of the third casting pile 502 has a counterweight base 504 for weighting. The one-way support member 50 The directional pile 5031 comprises a directional pile 5031 sleeved in the regular polygonal groove 406, the bottom of the directional pile 5031 is connected to the top of the third casting pile 502, the directional pile 5031 is connected with a plurality of groups of movable teeth 5032 corresponding to the plurality of groups of fixed teeth 407, the corners of the connecting surface between the movable teeth 5032 and the directional pile 5031 are provided with limiting grooves, the corresponding limiting grooves on the directional pile 5031 are connected with a limiting seat 5033, a one-way shaft 5034 is rotatably connected in the limiting seat 5033, the end of the one-way shaft 5034 is connected to the movable teeth 5032, the other end of the one-way shaft 5034 is sleeved with a transfer spring 5035, the one-way shaft 5034 is elastically transferred to the limit seat 5033 through the transfer spring 5035,A plurality of compensating load-bearing components 6 in a circular array are connected between the vertical steel bars of the second steel cage 401 and the vertical steel bars of the third steel cage 501, which are used to compensate for the supporting strength of the second steel cage 401. The compensating weighing components include a fixed adapter frame 601 connected to the second steel cage 401, and a reinforcing rib 603 is installed on the inner side of the fixed adapter frame 601 through bolts and nuts. A movable adapter frame 602 is installed on the other end of the reinforcing rib 603 through bolts and nuts. The movable adapter frame 602 is connected to the third steel cage 501.

[0042] The specific implementation method is as follows: after completing the height positioning of the second steel cage 401, a plurality of fixed adapter frames 601 are welded on the vertical steel bars of the second steel cage 401, and a plurality of movable adapter frames 602 are welded on the vertical steel bars of the third steel cage 501 corresponding to the plurality of fixed adapter frames 601, and then two sets of bolts and nuts are used to install reinforcing ribs 603 between a corresponding set of fixed adapter frames 601 and movable adapter frames 602 to compensate for the supporting strength of the second steel cage 401. In the process of fitting the directional cylinder 405 on the directional pile 5031, the fixed teeth 407 and the movable teeth 5032 are in a dislocated state. After the height of the second steel cage 401 is positioned, the directional cylinder 405 is twisted to make the fixed teeth 407 and the movable teeth 5032 complete the meshing, so that it can be adjusted according to the actual excavation depth of the pile foundation pit.

[0043] Specifically, a layered support assembly 7 is provided on the surface of the hard soil layer corresponding to the first steel cage 2, which is used to expand the support surface between the first casting pile 3 and the surface of the hard soil layer. The layered support assembly 7 includes a link frame 701, which is connected to the first steel cage 2 and is located on the surface of the hard soil layer. A fourth steel cage 702 is rolled on the circumferential surface of the link frame 701, and a layered support member 703 is cast on the surface of the hard soil layer corresponding to the fourth steel cage 702. The layered support member 703 includes a fourth steel cage 702 cast on the surface of the hard soil layer corresponding to the fourth steel cage 702, and a plurality of casting ports in a circular array are opened on the top of the fourth steel cage 702. A plurality of fifth steel cages 7032 are embedded in the hard soil layer corresponding to the plurality of casting ports. Fifth casting piles 7033 are cast on the hard soil layer corresponding to the plurality of fifth steel cages 7032, and the plurality of fifth casting piles 7033 are connected to the same pile foundation combination frame 7034.

[0044] The specific implementation method is as follows: before the second steel cage 401 and the third steel cage 501 are combined, a link frame 701 is first installed at the bottom of the second steel cage 401, and then a fourth steel cage 702 is rolled on the circumferential surface of the link frame 701, and poured at a position corresponding to the fourth steel cage 702 on the surface of the hard soil layer, and the fourth steel cage 702 is obtained after the concrete solidifies. During the pouring of the fourth steel cage 702, a plurality of pouring ports are reserved, and a fifth steel cage 7032 is placed into the plurality of pouring ports, and poured inside the hard soil layer corresponding to the fifth steel cage 7032 to obtain a first poured pile. On the one hand, the layered support assembly 7 can increase the connection surface between the bottom of the second steel cage 401 and the surface of the hard soil layer, thereby improving the stability of the second poured pile 402. On the other hand, the fifth poured pile 7033 poured by the layered support assembly 7 inside the hard soil layer can improve the load strength of the hard soil layer on the fourth poured pile 7031.

[0045] Working principle, when using:

[0046] During the operation, the construction workers operate the excavation equipment to excavate, and then lay a plurality of third steel cages 501 with a counterweight base 504 at the bottom in the hard soil layer, and then use the relevant type of concrete for pouring, and obtain the third pouring pile 502 after the concrete solidifies, and then the second steel cage 401 is installed on the top of the third steel cage 501, and the lowering depth is adjusted according to the actual depth of the excavation during the lowering of the second steel cage 401;

[0047] After the height positioning of the second steel cage 401 is completed, a plurality of fixed adapter frames 601 are welded on the vertical steel bars of the second steel cage 401, and a plurality of movable adapter frames 602 are welded on the vertical steel bars of the third steel cage 501 corresponding to the plurality of fixed adapter frames 601. Then, two sets of bolts and nuts are used to install reinforcing ribs 603 between a corresponding set of fixed adapter frames 601 and movable adapter frames 602 to compensate for the supporting strength of the second steel cage 401. In the process of fitting the directional cylinder 405 on the directional pile 5031, the fixed teeth 407 and the movable teeth 5032 are in a dislocated state. After the height positioning of the second steel cage 401 is completed, the directional cylinder 405 is twisted to make the fixed teeth 407 and the movable teeth 5032 complete the meshing. Therefore, it can be adjusted according to the actual excavation depth of the pile foundation pit, with high flexibility and strong practicality, suitable for the laying of prefabricated components, and conducive to speeding up the construction progress.

[0048] Before the second steel cage 401 and the third steel cage 501 are combined, a link frame 701 is first installed at the bottom of the second steel cage 401, and then a fourth steel cage 702 is rolled on the circumferential surface of the link frame 701, and poured at the surface of the hard soil layer corresponding to the fourth steel cage 702, and the fourth steel cage 702 is obtained after the concrete solidifies. During the pouring of the fourth steel cage 702, a plurality of pouring ports are reserved, and a fifth steel cage 7032 is placed into the plurality of pouring ports, and poured inside the hard soil layer corresponding to the fifth steel cage 7032 to obtain a first poured pile. On the one hand, the layered support assembly 7 can increase the connection surface between the bottom of the second steel cage 401 and the surface of the hard soil layer, thereby improving the stability of the second poured pile 402. On the other hand, the fifth poured pile 7033 poured by the layered support assembly 7 inside the hard soil layer can improve the load strength of the hard soil layer on the fourth poured pile 7031;

[0049] Then, the first steel cage 2 is laid in the soft soil layer and poured. After the concrete solidifies, the first pouring pile 3 is obtained. Finally, the low cap 1 is poured on the surface layer. The low cap 1, the first steel cage 2, the first pouring pile 3, the first hard soil layer pouring component 4 and the layered support component 7 are used as the upper structure, and the second hard soil layer pouring component 5 is used as the lower structure. The layered structure design is adopted, and the pressure on the hard soil layer is the greatest. When the hard soil layer sinks, the upper structure is supported by the surface layer and the surface layer of the hard soil layer, and the sinking speed of the upper structure is less than the sinking speed of the lower structure. Therefore, the counterweight base 504 will drive the directional pile 5031 to stretch in the directional cylinder 405 through the fourth pouring pile 7031, and the movable teeth When 5032 is subjected to the resistance from the fixed teeth 407, the movable teeth 5032 rotates on the inner side of the limit seat 5033 through the one-way rotating shaft 5034, and twists the switching spring 5035 to deform it. When the movable teeth 5032 moves between two adjacent fixed teeth 407, the switching spring 5035 starts to perform elastic reset movement. After reset, the movable teeth 5032 are re-stuck with the fixed teeth 407 to provide an upward supporting force for the fixed teeth 407, thereby avoiding to a certain extent the change in the height of the low pedestal 1 when settlement occurs, and can make the building pile foundation fixedly connected to the ground, so that the building pile foundation is more stable, and prevent the building pile foundation from being affected during other construction operations.

[0050] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A pile foundation fixing device for construction engineering, comprising a plurality of second hard soil layer casting assemblies (5) cast in a hard soil layer, characterized in that: The second hard soil layer casting component (5) is sleeved with a first hard soil layer casting component (4) cast in the soft soil layer, the top of the first hard soil layer casting component (4) is connected to a first steel cage (2) embedded in the soft soil layer, first casting piles (3) are cast in the soft soil layer corresponding to the first steel cage (2), and a low cap (1) is cast on the ground corresponding to the plurality of first casting piles (3).

2. A pile foundation fixing device for construction engineering according to claim 1, characterized in that: The first hard soil layer casting assembly (4) comprises a second steel cage (401) connected to the bottom of the first steel cage (2); a second casting pile (402) is cast in the soft soil layer corresponding to the second steel cage (401); an orientation groove (404) is reserved at the bottom of the second casting pile (402); and an orientation cylinder (405) is rotatably connected in the orientation groove (404).

3. A pile foundation fixing device for construction engineering according to claim 2, characterized in that: A regular polygonal groove (406) is provided at the bottom of the directional cylinder (405), and multiple faces of the regular polygonal groove (406) are connected to multiple fixed teeth (407) arranged in a linear manner, and the bottom ends of multiple vertical steel bars of the second steel cage (401) are provided with embedded grooves (403).

4. A pile foundation fixing device for construction engineering according to claim 1, characterized in that: The second hard soil layer casting assembly (5) comprises a third steel cage (501) sleeved in a plurality of embedded grooves (403); a third casting pile (502) is cast in the hard soil layer corresponding to the third steel cage (501); a unidirectional support member (503) is connected to the top of the third casting pile (502) corresponding to the regular polygonal groove (406) and is used for self-adjusting the support height when the hard soil layer sinks; and a counterweight base (504) is provided at the bottom of the third casting pile (502) for increasing weight.

5. A pile foundation fixing device for construction engineering according to claim 4, characterized in that: The one-way support member (503) comprises a directional pile (5031) sleeved in a regular polygonal groove (406), the bottom of the directional pile (5031) is connected to the top of the third casting pile (502), and the directional pile (5031) is connected with a plurality of groups of movable teeth (5032) corresponding to the plurality of groups of fixed teeth (407). The corners of the connection surface between the movable teeth (5032) and the directional pile (5031) are provided with limiting grooves. A limiting seat (5033) is connected to a corresponding limiting groove on the pile (5031), a one-way rotating shaft (5034) is rotatably connected in the limiting seat (5033), an end of the one-way rotating shaft (5034) is connected to the movable tooth (5032), and a transfer spring (5035) is sleeved on the other end of the one-way rotating shaft (5034), and the one-way rotating shaft (5034) is elastically transferred to the limiting seat (5033) through the transfer spring (5035).

6. A pile foundation fixing device for construction engineering according to claim 3, characterized in that: A plurality of compensating load-bearing components (6) in a ring array are connected between the vertical steel bars of the second steel cage (401) and the vertical steel bars of the third steel cage (501), and are used to compensate for the supporting strength of the second steel cage (401). The compensating load-bearing components (6) include a fixed adapter frame (601) connected to the second steel cage (401), a reinforcing rib (603) is installed on the inner side of the fixed adapter frame (601) by means of bolts and nuts, and a movable adapter frame (602) is installed on the other end of the reinforcing rib (603) by means of bolts and nuts, and the movable adapter frame (602) is connected to the third steel cage (501).

7. A pile foundation fixing device for construction engineering according to claim 1, characterized in that: A layered support assembly (7) is provided on the surface of the hard soil layer corresponding to the first steel cage (2), and is used to expand the support surface between the first cast pile (3) and the surface of the hard soil layer. The layered support assembly (7) comprises a link frame (701), the link frame (701) is connected to the first steel cage (2) and is located on the surface of the hard soil layer, a fourth steel cage (702) is rolled on the circumferential surface of the link frame (701), and a layered support member (703) is cast on the surface of the hard soil layer corresponding to the fourth steel cage (702).

8. A pile foundation fixing device for construction engineering according to claim 7, characterized in that: The layered support member (703) includes a fourth steel cage (702) cast on the surface of the hard soil layer, wherein the top of the fourth steel cage (702) is provided with a plurality of casting openings in a circular array, and a plurality of fifth steel cages (7032) are embedded in the hard soil layer corresponding to the plurality of casting openings, and a fifth casting pile (7033) is cast in the hard soil layer corresponding to the plurality of fifth steel cages (7032), and the plurality of fifth casting piles (7033) are connected to the same pile foundation assembly frame (7034).

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