Building deep foundation pit supporting structure and construction method thereof

Abstract

The invention relates to the technical field of building construction, and discloses a building deep foundation pit supporting structure and a construction method thereof.The building deep foundation pit supporting structure comprises tubular pile structures, connecting base structures are installed at the tops of the tubular pile structures, and the adjacent connecting base structures are connected through connecting beam structures; a lock catch steel plate is arranged in the middle of the connecting beam structure in a penetrating mode, a supporting beam structure is installed between the opposite pipe pile structures, and a reinforcing mesh is laid on the side wall of the foundation pit. The connecting beam structure comprises a beam body, and the beam body is installed between the two connecting base structures. The joining beam structure, the crown beam plate and the pipe pile structure are connected through the connecting base structure, the position of the lock catch steel plate is limited through the joining beam structure, so that the stability of the structure is guaranteed, and meanwhile through combined use of the pipe pile structure, the lock catch steel plate and the supporting beam structure, the stability of the structure is improved. And the supporting structure can keep a good supporting effect under various complex geological conditions.

Description

Technical Field

[0001] The invention relates to the technical field of building construction, in particular to a building deep foundation pit supporting structure and a construction method thereof. Background Art

[0002] With the acceleration of urbanization, there are more and more high-rise buildings and underground projects, and deep foundation pit excavation has become a common construction link. Traditional deep foundation pit support methods mainly include pile anchor system, continuous wall, shotcrete support, etc. These methods have achieved good results in practical applications, but under complex geological conditions, there are still problems such as insufficient support strength, difficult construction, and high cost. In recent years, with the application of new materials and new technologies, some innovative support methods have gradually been developed, but they still cannot fully meet the requirements of high efficiency and low cost.

[0003] The pile-anchor foundation pit support structure currently used usually drives reinforced concrete piles around the foundation pit and sets anchor rods on them to enhance the stability of the support structure. The advantages are simple construction and strong adaptability, but the disadvantages are high cost and easy displacement in soft soil. The continuous wall support is to support by building a continuous reinforced concrete wall around the foundation pit, which has high bearing capacity and anti-seepage performance. However, this method has a long construction period and large equipment investment, and is not suitable for small sites. The sprayed concrete support is to spray a layer of concrete on the foundation pit wall to form a protective layer. It is easy to operate, but the support strength is limited and it is difficult to cope with complex geological conditions. Summary of the invention

[0004] In view of the shortcomings of the prior art, the present invention provides a building deep foundation pit support structure and a construction method thereof, which solve the problems that the existing deep foundation pit support structure is difficult to adapt to complex geological conditions and high water level environment, has insufficient anti-deformation capacity, lacks synergy of layered support and complex construction.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions: a building deep foundation pit support structure and a construction method thereof, comprising a pipe pile structure, a connecting seat structure is installed on the top of the pipe pile structure, adjacent connecting seat structures are connected by a connecting beam structure, a locking steel plate is penetrated in the middle of the connecting beam structure, a supporting beam structure is installed between the pipe pile structures, and a steel mesh is laid on the side wall of the foundation pit; The connecting beam structure includes a beam body, which is installed between the two connecting seat structures. A slot is opened in the middle of the beam body, and the locking steel plate is passed through the middle of the slot. An adjusting bolt is threadedly connected to the outer side of the beam body, and the adjusting bolt and the outer surface of the locking steel plate are in contact with each other.

[0006] Preferably, the pipe pile structure includes a pile body, the pile body is vertically inserted into the ground, a high-strength bolt is pre-embedded on the top of the pile body, the connecting seat structure is installed on the upper part of the high-strength bolt, a guide groove is opened on the outside of the pile body, the locking steel plate is passed through the middle of the guide groove, an embedded steel plate is installed on the side wall of the pipe pile structure, a plurality of threaded holes are opened in the middle of the embedded steel plate, and the supporting beam structure is installed on the side wall of the embedded steel plate through the threaded hole.

[0007] Preferably, the connecting seat structure includes a base, a plurality of through holes are opened in the middle of the base, the base is connected to the high-strength bolt 1 through the through holes, a connecting piece is fixedly connected to the top of the base, and a high-strength bolt 2 is installed on the outer side of the connecting piece.

[0008] Preferably, the connecting beam structure further comprises a mounting plate, wherein the mounting plate is fixedly connected to the outer side of the beam body, and the mounting plate is connected to the connecting member via high-strength bolts 2.

[0009] Preferably, the support beam structure includes a mounting seat, the mounting seat is connected to the threaded hole one by a high-strength bolt four, a support seat is fixedly installed on the outside of the mounting seat, a steel beam is installed on the upper part of the support seat, and a concrete block is cast between the steel beam and the mounting seat.

[0010] Preferably, a crown beam plate is overlapped between two adjacent connecting seat structures, a slot is provided at the top of the connecting piece, a threaded hole two is provided on the side wall of the connecting piece, the crown beam plate includes a plate body, the plate body is inserted in the middle of the slot, a high-strength bolt three is passed through the outside of the plate body, and the other end of the high-strength bolt three is threadedly connected to the threaded hole two.

[0011] Preferably, the crown beam plate further comprises a support block, wherein the support block is fixedly connected to the bottom of the plate body and overlapped with the upper part of the beam body.

[0012] A construction method for a deep foundation pit support structure, comprising the following steps: S1. Measure and lay out, determine the position and spacing of the pipe pile structure, adjust the angle of the pipe pile structure according to the direction of the foundation pit layout, use a pile driver to vertically drive the pipe pile structure into the soil around the foundation pit, and make the pile top higher than the ground; S2. The connection seat structure is connected to the pile body by a high-strength bolt, and the notch on the side wall of the base is aligned with the guide groove; S3. Connect the connecting beam structure to the connecting piece through high-strength bolts 2, then pass the locking plate through the middle of the notch, and hammer the locking plate into the soil by a pile driver, and adjust the verticality of the locking plate by turning the adjusting bolts; S4. The end of the plate is clamped in the middle of the slot, and the plate and the connector are connected by high-strength bolts three and threaded holes two; S5. Excavate the foundation pit, and after the embedded steel plate is exposed, connect the mounting seat to the embedded steel plate through high-strength bolts 4, threaded holes 1, and then overlap the steel beam on the upper part of the support seat, support the formwork in the gap between the steel beam and the mounting seat and pour concrete, and after the concrete solidifies, form concrete blocks to fill the gap; S6. After continuing to excavate until the foundation pit is completely exposed, lay steel mesh on the side walls of the foundation pit and pour concrete to ensure that the concrete layer evenly covers the entire foundation pit wall.

[0013] Preferably, in step S1, the top of the pile is 50 cm above the ground.

[0014] Preferably, the concrete grade used in steps S5 and S6 is C30, and in step S6, the thickness of the poured concrete is not less than 10 cm.

[0015] Working principle: First, use a pile driver to drive the pipe pile structure vertically into the soil around the foundation pit, and ensure that the top of the pipe pile structure is 50cm above the ground. Then align the hole in the middle of the base with the high-strength bolt 1 and insert it, so that the entire connection seat structure and the high-strength bolt 1 are connected through the nut. Then align and insert the mounting plate and the high-strength bolt 2 to complete the connection between the connecting beam structure and the connecting seat structure. Connect multiple pipe pile structures through the connecting beam structure to improve the overall stability of the support. After the connecting beam structure is installed, pass the locking steel plate through the middle of the slot, and hammer the locking steel plate into the soil again through the pile driver. When the locking steel plate is inserted into the soil, it will be affected by the guide groove and move vertically downward. The locking steel plate structure and the guide groove cooperate to form a closed support as a whole, thereby completing the preliminary support operation of the wall. After the locking steel plate is inserted into the ground, the position of the locking steel plate is adjusted by screwing the adjusting bolt to ensure the sealing of the connection of multiple locking steel plates. Then the crown beam plate is buckled as a whole on the upper part of the connecting seat structure and the connecting beam structure. At this time, the short side edge of the crown beam plate is stuck in the middle of the slot, and the support block is overlapped on the upper part of the beam body. Then, after connecting the high-strength bolt three and the threaded hole two, the overall installation of the crown beam plate is completed. After installing multiple crown beam plates on the outside, the crown beam part of the support structure is formed, thus completing the preliminary support of the foundation pit.

[0016] After completing the installation of the pipe pile structure, the connection seat structure, the connecting beam structure, the locking steel plate and the crown beam plate structure, dig the foundation pit, and after the position of the embedded steel plate is exposed, dock the mounting seat with the embedded steel plate, and then connect the mounting seat and the pipe pile structure with four high-strength bolts. After installing the steel beam on the upper part of the support seat, pour concrete in the gap between the steel beam and the mounting seat, and wait for the concrete to solidify to form a concrete block. In this way, the steel beam is installed and the gap between the steel beam and the mounting seat is filled to ensure the support strength of the pipe pile structure. The installation of the entire support beam structure is completed. In this way, the opposite sides of the foundation pit support are supported to ensure the stability of the support. After completing the installation of the initial support beam structure, continue to dig downwards, so that multiple embedded steel plates are fully exposed, thereby providing multi-level support for the foundation pit to further ensure the stability of the support.

[0017] After the excavation of the foundation pit is completed, a steel mesh is laid on the foundation pit wall, and concrete is poured with a thickness of about 10 cm to ensure that the concrete layer evenly covers the entire foundation pit wall. In this way, the construction of the entire foundation pit support is completed. During the construction process, except for pouring concrete around the steel mesh, the remaining steps are prefabricated in the factory, thus improving the construction efficiency of the deep foundation pit. After the foundation construction is completed, multiple groups of bolts are disassembled, so that all parts except the steel mesh are removed, thereby realizing the reuse of the support structure and greatly reducing the construction cost.

[0018] The present invention provides a building deep foundation pit support structure and a construction method thereof. It has the following beneficial effects: 1. In the present invention, a connecting seat structure is used to connect the connecting beam structure, the crown beam plate and the pipe pile structure, and the connecting beam structure is used to limit the position of the locking steel plate to ensure the stability of the structure. At the same time, through the combined use of the pipe pile structure, the locking steel plate and the supporting beam structure, the support structure can maintain a good support effect under various complex geological conditions.

[0019] 2. In the present invention, except for the steel mesh components, the remaining components are connected by bolts and can be disassembled and recycled after the construction is completed. Compared with the traditional pile anchor system and continuous wall method, it is more economical, has a short construction period, and reduces the investment in labor and equipment.

[0020] 3. In the present invention, the rapid driving of the pipe pile structure and the convenient installation of the support beam structure greatly shorten the construction time of the support structure and speed up the progress of the project. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A perspective view of the present invention; Figure 2 is a schematic diagram of the pipe pile structure in the present invention; Figure 3 is a schematic diagram of a connecting beam structure in the present invention; Figure 4 is a schematic diagram of the support beam structure of the present invention; Figure 5 It is a schematic diagram of the crown beam plate in the present invention; Figure 6 It is a schematic diagram of the overall steps of the construction method of the present invention.

[0022] Among them, 1. Pipe pile structure; 11. Pile body; 12. High-strength bolt one; 13. Guide groove; 14. Embedded steel plate; 15. Threaded hole one; 2. Connecting seat structure; 21. Base; 22. Connector; 23. High-strength bolt two; 24. Threaded hole two; 25. Slot; 3. Connecting beam structure; 31. Beam body; 32. Notch; 33. Adjusting bolt; 34. Mounting plate; 4. Locking steel plate; 5. Crown beam plate; 51. Plate body; 52. High-strength bolt three; 53. Support block; 6. Steel mesh; 7. Support beam structure; 71. Mounting seat; 72. Support seat; 73. Concrete block; 74. Steel beam; 75. High-strength bolt four. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the specification 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.

[0024] Embodiment 1: Please refer to the attached Figure 1 -Attached Figure 2 The embodiment of the present invention provides a deep foundation pit support structure for buildings, including a pipe pile structure 1, a connection seat structure 2 is installed on the top of the pipe pile structure 1, and the pipe pile structure 1 includes a pile body 11, and the pile body 11 is vertically inserted into the ground. When performing foundation pit construction support, the installation position of the pipe pile structure 1 is first confirmed by measuring and defense line, and then the pipe pile structure 1 is vertically driven into the soil around the foundation pit by a pile driver, and the pile top is raised about 50 cm above the ground. A high-strength bolt 12 is pre-embedded on the top of the pile body 11. The high-strength bolt 12 is embedded during the prefabrication process of the pile body 11 to ensure the connection strength of the high-strength bolt 12, and the connection seat structure 2 is installed on the upper part of the high-strength bolt 12.

[0025] Please refer to the attached Figure 2The connection seat structure 2 includes a base 21, a plurality of through holes are opened in the middle of the base 21, and the base 21 is connected to the high-strength bolt 12 through the through holes. After the pipe pile structure 1 is installed, the through holes and the high-strength bolt 12 are aligned, and the base 21 is inserted into the high-strength bolt 12, and then the base 21 and the pile body 11 are connected by nuts. A connector 22 is fixedly connected to the top of the base 21, and a high-strength bolt 23 is installed on the outside of the connector 22. The connector 22 and the base 21 are integrally formed.

[0026] Please refer to the attached Figure 3 Adjacent connection seat structures 2 are connected by a connecting beam structure 3, and the position between the two connection seat structures 2 is confirmed by the connecting beam structure 3, and the pipe pile structure 1 is connected to ensure the stability of the installation of the pipe pile structure 1. The connecting beam structure 3 includes a beam body 31, which is installed between the two connection seat structures 2. A notch 32 is opened in the middle of the beam body 31, and a locking steel plate 4 is passed through the middle of the connecting beam structure 3. The locking steel plate 4 is passed through the middle of the notch 32. After the beam body 31 is installed, the locking steel plate 4 is passed through the middle of the notch 32, and the locking steel plate 4 is hammered into the soil by a pile driver. The locking steel plates 4 are connected to each other by locking, and after the locking steel plates 4 are installed, a sealing material is poured at the connection between the locking steel plates 4 and the locking steel plates 4, thereby ensuring the sealing after installation. The outer side of the beam body 31 is threadedly connected with an adjusting bolt 33, which abuts against the outer surface of the locking steel plate 4. After the locking steel plate 4 is installed, the inclination of the locking steel plate 4 is adjusted by screwing the adjusting bolt 33 to ensure that the locking steel plate 4 is tightly clamped. The connecting beam structure 3 also includes a mounting plate 34, which is fixedly connected to the outer side of the beam body 31. The mounting plate 34 is connected to the connecting piece 22 through a high-strength bolt 23. After the connection seat structure 2 is completed, the mounting plate 34 is aligned with the high-strength bolt 23, and then the mounting plate 34 and the connecting piece 22 are connected by bolts.

[0027] Please refer to the attached Figure 2 -Attached Figure 4A guide groove 13 is provided on the outside of the pile body 11, and the locking steel plate 4 is inserted in the middle of the guide groove 13. The locking steel plate 4 at the edge is guided by the guide groove 13, thereby determining the position of the locking steel plate 4 and ensuring that the locking steel plate 4 is parallel to the pile body 11. A support beam structure 7 is installed between the relative pipe pile structures 1, and the pipe pile structure 1 is laterally supported by the support beam structure 7, thereby ensuring the overall stability of the support structure. An embedded steel plate 14 is installed on the side wall of the pipe pile structure 1, and a plurality of threaded holes 15 are provided in the middle of the embedded steel plate 14. The support beam structure 7 is installed on the side wall of the embedded steel plate 14 through the threaded holes 15. The installation position of the support beam structure 7 is confirmed by the embedded steel plate 14. After the foundation pit is excavated downward until the embedded steel plate 14 is exposed, it means that the support beam structure 7 needs to be installed. At this time, the support beam structure 7 is installed on the side wall of the embedded steel plate 14 through the threaded holes 15 to ensure the stability of the foundation pit support. The support beam structure 7 includes a mounting seat 71, which is connected to the threaded hole 15 by a high-strength bolt 75. The mounting seat 71 and the embedded steel plate 14 are first docked, and then the through hole opened in the middle of the mounting seat 71 is aligned with the threaded hole 15, and the high-strength bolt 75 is passed through the through hole to connect the mounting seat 71 and the embedded steel plate 14. A support seat 72 is fixedly installed on the outside of the mounting seat 71, and a steel beam 74 is installed on the upper part of the support seat 72. A concrete block 73 is poured between the steel beam 74 and the mounting seat 71. After the mounting seat 71 is installed, the steel beam 74 is overlapped on the upper part of the support seat 72, and then a template is arranged on the outside of the gap between the steel beam 74 and the mounting seat 71, and concrete is poured in the gap. After the concrete solidifies, a concrete block 73 is formed. The side walls of the foundation pit are paved with steel mesh 6. After the foundation pit is excavated, the steel mesh 6 is laid on the wall of the foundation pit, and then C30 concrete is poured. The thickness of the concrete pouring is not less than 10 cm, thereby connecting the side walls of the foundation pit into a whole to further improve the support effect.

[0028] Please refer to the attached Figure 1 and attached Figure 5A crown beam plate 5 is also overlapped between two adjacent connection seat structures 2. After the crown beam plate 5 is overlapped on the upper part of the connection seat structure 2, it can form a whole and act as a crown beam. It can be removed after the construction is completed to reduce costs. A slot 25 is opened on the top of the connector 22, and a threaded hole 24 is opened on the side wall of the connector 22. The crown beam plate 5 includes a plate body 51, which is inserted in the middle of the slot 25. A high-strength bolt 3 52 is passed through the outer side of the plate body 51. The other end of the high-strength bolt 3 52 is threadedly connected with the threaded hole 24. First, the short side edge of the plate body 51 is clamped in the middle of the slot 25, and the high-strength bolt 3 52 is aligned with the threaded hole 24. In this way, the plate body 51 and the connector 22 are connected by the high-strength bolt 3 52. The crown beam plate 5 also includes a support block 53, which is fixedly connected to the bottom of the plate body 51 and overlapped on the upper part of the beam body 31. The support block 53 is used to support the middle part of the plate body 51 to ensure the structural strength of the plate body 51, and at the same time transmit the force downward to improve the stability of the plate body 51 after installation.

[0029] Embodiment 2: Please refer to the attached Figure 6 As part of the present invention, this embodiment provides a construction method for a deep foundation pit support structure, comprising the following steps: S1. Measure and lay out, determine the position and spacing of the pipe pile structure 1, adjust the angle of the pipe pile structure 1 according to the direction of the foundation pit layout, use a pile driver to vertically drive the pipe pile structure 1 into the soil around the foundation pit, and make the pile top 50cm above the ground; S2. The connection base structure 2 is connected to the pile body 11 by a high-strength bolt 12, and then the hole in the middle of the base 21 is aligned with the high-strength bolt 12 and inserted, so that the connection base structure 2 is connected to the high-strength bolt 12 by a nut, and the notch on the side wall of the base 21 is aligned with the guide groove 13, and the notch on the side wall of the base 21 and the guide groove 13 work together to guide the locking steel plate 4; S3. Connect the connecting beam structure 3 with the connecting piece 22 through the high-strength bolt 23, then pass the locking steel plate 4 through the middle of the slot 32, and hammer the locking steel plate 4 into the soil by a pile driver, and adjust the verticality of the locking steel plate 4 by turning the adjusting bolt 33; after the connecting beam structure 3 is installed, pass the locking steel plate 4 through the middle of the slot 32, and hammer the locking steel plate 4 into the soil again by a pile driver. When the locking steel plate 4 is inserted into the soil, it will be affected by the guide groove 13 and move vertically downward. The locking steel plate 4 structure cooperates with the guide groove 13 to form a closed supporting whole, thereby completing the preliminary support operation of the wall. After the locking steel plate 4 is inserted into the ground, the position of the locking steel plate 4 is adjusted by turning the adjusting bolt 33 to ensure the sealing of the connection of multiple locking steel plates 4.

[0030] S4. Clamp the end of the plate body 51 in the middle of the slot 25, and connect the plate body 51 and the connector 22 through the high-strength bolt three 52 and the threaded hole two 24; first clamp the short side edge of the plate body 51 in the middle of the slot 25, and align the high-strength bolt three 52 and the threaded hole two 24, at this time the support block 53 is overlapped on the upper part of the beam body 31, so that the plate body 51 and the connector 22 are connected through the high-strength bolt three 52.

[0031] S5. Excavate the foundation pit, and after the embedded steel plate 14 is exposed, connect the mounting seat 71 to the embedded steel plate 14 through the high-strength bolt 75, the threaded hole 15, and then overlap the steel beam 74 on the upper part of the support seat 72. After the installation of the pipe pile structure 1, the connecting seat structure 2, the connecting beam structure 3, the locking steel plate 4 and the crown beam plate 5 is completed, dig the foundation pit, and after the position of the embedded steel plate 14 is exposed, connect the mounting seat 71 with the embedded steel plate 14, support the formwork in the gap between the steel beam 74 and the mounting seat 71 and pour C30 concrete, and after the concrete solidifies, form concrete blocks 73 to fill the gap; S6. After the excavation is continued to completely expose the foundation pit, after the installation of the primary support beam structure 7 is completed, the excavation is continued downwards to completely expose multiple embedded steel plates 14, thereby providing multi-level support for the foundation pit to further ensure the stability of the support. The steel mesh 6 is laid on the side wall of the foundation pit, and C30 concrete is poured, with a concrete thickness of not less than 10 cm, to ensure that the concrete layer evenly covers the entire foundation pit wall.

[0032] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A deep foundation pit support structure for a building, comprising a pipe pile structure (1), characterized in that: A connecting seat structure (2) is installed on the top of the pipe pile structure (1), adjacent connecting seat structures (2) are connected by a connecting beam structure (3), a locking steel plate (4) is passed through the middle of the connecting beam structure (3), a supporting beam structure (7) is installed between the pipe pile structures (1), and a steel mesh (6) is laid on the side wall of the foundation pit; The connecting beam structure (3) comprises a beam body (31), the beam body (31) being installed between the two connecting seat structures (2), a notch (32) being provided in the middle of the beam body (31), the locking steel plate (4) being passed through the middle of the notch (32), an adjusting bolt (33) being threadedly connected to the outer side of the beam body (31), the adjusting bolt (33) and the outer surface of the locking steel plate (4) being in contact with each other.

2. A building deep foundation pit support structure according to claim 1, characterized in that: The pipe pile structure (1) comprises a pile body (11), the pile body (11) is vertically inserted into the ground, a high-strength bolt (12) is pre-buried at the top of the pile body (11), the connection seat structure (2) is installed on the upper part of the high-strength bolt (12), a guide groove (13) is opened on the outer side of the pile body (11), the locking steel plate (4) is inserted in the middle of the guide groove (13), an embedded steel plate (14) is installed on the side wall of the pipe pile structure (1), a plurality of threaded holes (15) are opened in the middle of the embedded steel plate (14), and the support beam structure (7) is installed on the side wall of the embedded steel plate (14) through the threaded hole (15).

3. A building deep foundation pit support structure according to claim 2, characterized in that: The connecting seat structure (2) comprises a base (21), a plurality of through holes are formed in the middle of the base (21), the base (21) is connected to the high-strength bolt 1 (12) via the through holes, a connecting piece (22) is fixedly connected to the top of the base (21), and a high-strength bolt 2 (23) is installed on the outside of the connecting piece (22).

4. A building deep foundation pit support structure according to claim 3, characterized in that: The connecting beam structure (3) further comprises a mounting plate (34), wherein the mounting plate (34) is fixedly connected to the outside of the beam body (31), and the mounting plate (34) is connected to the connecting member (22) via a second high-strength bolt (23).

5. A building deep foundation pit support structure according to claim 2, characterized in that: The support beam structure (7) comprises a mounting seat (71), the mounting seat (71) being connected to the threaded hole (15) via a high-strength bolt (75); a support seat (72) is fixedly mounted on the outside of the mounting seat (71); a steel beam (74) is mounted on the top of the support seat (72); and a concrete block (73) is cast between the steel beam (74) and the mounting seat (71).

6. A building deep foundation pit support structure according to claim 3, characterized in that: A crown beam plate (5) is also overlapped between two adjacent connection seat structures (2), a slot (25) is provided at the top of the connection piece (22), a second threaded hole (24) is provided on the side wall of the connection piece (22), the crown beam plate (5) comprises a plate body (51), the plate body (51) is inserted into the middle of the slot (25), a third high-strength bolt (52) is passed through the outer side of the plate body (51), and the other end of the third high-strength bolt (52) is threadedly connected to the second threaded hole (24).

7. A building deep foundation pit support structure according to claim 6, characterized in that: The crown beam plate (5) further comprises a support block (53), wherein the support block (53) is fixedly connected to the bottom of the plate body (51), and the support block (53) is overlapped on the upper part of the beam body (31).

8. A construction method for a deep foundation pit support structure, characterized in that: Using a building deep foundation pit support structure according to any one of claims 1 to 7 comprises the following steps: S1. Measure and lay out, determine the position and spacing of the pipe pile structure (1), adjust the angle of the pipe pile structure (1) according to the direction of the foundation pit layout, use a pile driver to vertically drive the pipe pile structure (1) into the soil around the foundation pit, and make the top of the pile higher than the ground; S2. The connection seat structure (2) is connected to the pile body (11) as a whole by a high-strength bolt (12), and the notch on the side wall of the base (21) is aligned with the guide groove (13); S3. Connect the connecting beam structure (3) to the connecting member (22) through the high-strength bolt (23), and then pass the locking steel plate (4) through the middle of the notch (32), and hammer the locking steel plate (4) into the soil by a pile driver, and adjust the verticality of the locking steel plate (4) by turning the adjusting bolt (33); S4. The end of the plate (51) is clamped in the middle of the slot (25), and the plate (51) and the connector (22) are connected by high-strength bolts (52) and threaded holes (24); S5. Excavate the foundation pit, and after the embedded steel plate (14) is exposed, connect the mounting seat (71) with the embedded steel plate (14) through four high-strength bolts (75), a threaded hole (15), and then overlap the steel beam (74) on the upper part of the support seat (72), support the formwork and pour concrete in the gap between the steel beam (74) and the mounting seat (71), and after the concrete solidifies, form a concrete block (73) to fill the gap; S6. After the excavation is continued until the foundation pit is completely exposed, a steel mesh (6) is laid on the side wall of the foundation pit, and concrete is poured to ensure that the concrete layer evenly covers the entire foundation pit wall.

9. A construction method for a deep foundation pit support structure according to claim 8, characterized in that: In step S1, the top of the pile is 50 cm above the ground.

10. The construction method of a deep foundation pit support structure according to claim 8, characterized in that: The concrete grade used in steps S5 and S6 is C30, and in step S6, the thickness of the poured concrete is not less than 10 cm.

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