Pre-stressed anchor cable secant pile deep foundation pit supporting structure

Abstract

The invention belongs to the technical field of deep foundation pit supporting, and particularly relates to a pre-stressed anchor cable secant pile deep foundation pit supporting structure which comprises a protection base, a supporting plate is arranged above the protection base, rotating seats are fixedly connected to the two sides of the bottom of the supporting plate, two vertical blocks are fixedly connected to one side of the top of the protection base, and the two vertical blocks are fixedly connected to the other side of the top of the protection base. A supporting protection mechanism is arranged in an inner cavity of the protection base. The supporting and protecting mechanism comprises a plurality of fixing seats, a plurality of threaded rods are arranged in an inner cavity of the protecting base, the outer rings of the threaded rods are sleeved with moving seats through threads, and a plurality of connecting rods are arranged above the protecting base. Through the structural cooperation, the supporting plate can be evenly and comprehensively attached to the supporting face, local stress concentration is avoided, stress uniformity and structural integrity in the supporting process are improved, efficient transmission of force is ensured, and due to the overall structural design, supporting force can be synchronously applied from multiple points and evenly distributed on the supporting plate.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of deep foundation pit support, in particular to a prestressed anchor cable and interlocking pile deep foundation pit support structure. BACKGROUND

[0002] Deep foundation pit support refers to a series of structural measures and technical means adopted during deep foundation pit excavation to ensure the stability of the pit side wall soil, prevent collapse, control deformation, and protect surrounding buildings, underground pipelines, and construction personnel safety.

[0003] A patent with the patent number CN118128055A discloses a prestressed anchor cable and interlocking pile deep foundation pit support structure and its use method. The technical solution points are: including a U-shaped plate, the top front and rear ends of the U-shaped plate are fixedly connected with first fixed plates, the top front and rear ends of the two first fixed plates are rotatably connected with first clamping plates, the top of the first clamping plate located at the front end and the first clamping plate located at the rear end are fixedly connected with left and right vertical blocks, the left and right vertical blocks are fixedly connected with support columns at the top ends of the left sides, and the U-shaped plate is fixedly connected with a support column on the left side.

[0004] The above patent sets an adjusting mechanism through the cooperation of the above structure. When the motor is started, the first roller rotates, driving the caterpillar belt to rotate. When the caterpillar belt rotates, the first tooth block moves with the caterpillar belt. Since the half-tooth ring is engaged with the first tooth block, the purpose of setting the limiting block is to prevent the second roller from moving out of the second sliding groove, thereby limiting the movement and making the device move stably.

[0005] However, the above technology often has the following defects: During the support operation, the support force is mainly provided by the inclined push rod, and the transmission path of the support force is single and concentrated in a local area. When the soil on the outside of the foundation pit produces a large lateral pressure, the pressure will act on the support plate surface and continuously disperse to both sides of the plate surface. Due to the lack of effective lateral constraint and overall collaborative stress mechanism, the support force cannot be uniformly and centrally transmitted to the interlocking pile main structure, causing the middle part of the support plate surface to be overloaded and the edges to fail, which easily leads to bending deformation or even local buckling damage of the plate surface. At the same time, as the main load-bearing component, the inclined push rod is in a very unfavorable stress state, which is prone to instability or connection part loosening due to eccentric loading or stress concentration, seriously affecting the overall stiffness and long-term stability of the support structure, and causing the support efficiency to decay over time. Therefore, the present application provides a prestressed anchor cable and interlocking pile deep foundation pit support structure. SUMMARY

[0006] In order to make up for the deficiencies of the prior art and solve at least one technical problem raised in the background art.

[0007] The technical scheme adopted by the present application to solve its technical problems is: the prestressed anchor cable interlocking pile deep foundation pit support structure comprises a protection base, a support plate is arranged above the protection base, rotating seats are fixedly connected to the bottom of the support plate on both sides, two vertical blocks are fixedly connected to the top of the protection base on one side, and a support protection mechanism is arranged in the inner cavity of the protection base. The support protection mechanism comprises a plurality of fixing seats, a plurality of threaded rods are arranged in the inner cavity of the protection base, a moving seat is arranged on the outer circle of the threaded rod through a threaded sleeve, a plurality of connecting rods are arranged above the protection base, a fixed long plate is fixedly connected to the bottom of the inner cavity of the protection base, a first bevel gear is fixedly connected to one end of the threaded rod through a shaft sleeve and penetrates through one side of the adjacent fixed long plate, a rotating rod is arranged in the inner cavity of the protection base, and a plurality of second bevel gears are sleeved on the outer circle of the rotating rod.

[0008] As a preferred technical scheme of the present application, the two sides of the vertical block are rotatably connected to the inner walls of the adjacent rotating seats through rotating shafts, one side of the fixing seat is fixedly connected to one side of the adjacent support plate, the two sides of the connecting rod are rotatably connected to the inner walls of the adjacent moving seats through rotating shafts, and the two sides of the connecting rod are rotatably connected to the inner walls of the adjacent fixing seats through rotating shafts.

[0009] As a preferred technical scheme of the present application, the bottom of the moving seat is fixedly connected with a sliding block, a plurality of sliding grooves are formed in the bottom of the inner cavity of the protection base, and the outer surface of the sliding block is slidably connected to the inner cavity of the corresponding sliding groove.

[0010] As a preferred technical scheme of the present application, the other end of the threaded rod is rotatably connected to the inner wall of the adjacent protection base through a rotating shaft, one side of the protection base is fixedly connected with an L-shaped plate, a driving motor is fixedly installed on the inner wall of one side of the L-shaped plate, one end of the rotating rod penetrates through the inner wall of the adjacent protection base and is fixedly connected to the output shaft of the driving motor, and the other end of the rotating rod is rotatably connected to the inner wall of the adjacent protection base through a rotating shaft.

[0011] As a preferred technical scheme of the present application, an inclined strut mechanism is arranged above the protection base; the inclined strut mechanism comprises a support plate, a plurality of vertical rods are fixedly connected to the top of the support plate, a plurality of inclined insertion rods are arranged on one side of the support plate, a ground pile support is fixedly connected to the bottom end of the inclined insertion rod, a support seat is fixedly connected to the outer surface wall of the inclined insertion rod, a reinforcing support rod is arranged in the inner cavity of the support seat, a sliding seat is slidably connected to the outer surface wall of the vertical rod, and a mounting groove is formed in one side of the sliding seat.

[0012] As a preferred technical scheme of the present application, the bottom of the support plate is fixedly connected with the top of the protection base, the two sides of the reinforcing support rod are rotatably connected with the inner walls of the adjacent support seat through pivots, and the two sides of the reinforcing support rod are rotatably connected with the inner walls of the adjacent sliding seat through pivots.

[0013] As a preferred technical scheme of the present application, one side of the sliding seat is provided with a fixing mechanism; the fixing mechanism comprises a protection shell, a fixing plug rod is arranged in the inner cavity of the protection shell, a second spring is sleeved on the outer ring of the fixing plug rod, a baffle is sleeved on the outer ring of the fixing plug rod, a plurality of mounting insertion holes are formed in one side of the vertical rod, one end of the fixing plug rod penetrates through the side wall of the adjacent sliding seat and is inserted into the inner cavity of the corresponding mounting insertion hole, and the other end of the fixing plug rod penetrates through the inner wall of the adjacent protection shell and is fixedly connected with a holding end portion.

[0014] As a preferred technical scheme of the present application, the two ends of the protection shell are fixedly connected with one side of the corresponding sliding seat, one end of the second spring is fixedly connected with the side wall of the corresponding sliding seat, and the other end of the second spring is fixedly connected with one side of the corresponding baffle.

[0015] As a preferred technical scheme of the present application, the upper side of the protection base is provided with a connecting mechanism; the connecting mechanism comprises a connecting frame, one side of the connecting frame is fixedly connected with one side of the adjacent support plate through a plurality of telescopic rods, a first spring is sleeved on the outer ring of the telescopic rod, a plurality of inclined support plates are fixedly connected to the bottom of the connecting frame, two adjacent moving seats are fixedly connected through a connecting plate, and the bottom of the inclined support plate is fixedly connected with the top of the corresponding connecting plate.

[0016] As a preferred technical scheme of the present application, one end of the first spring is fixedly connected with one side of the adjacent connecting frame, and the other end of the first spring is fixedly connected with one side of the adjacent support plate.

[0017] The beneficial effects of the present application are as follows: 1. The prestressed anchor cable occlusion pile deep foundation pit support structure can uniformly and comprehensively adhere to the support surface through the arrangement of the support protection mechanism, avoids local stress concentration, improves the stress uniformity and structural integrity during the support process, ensures efficient force transmission, and the overall structure design enables the support force to be synchronously applied from multiple points and uniformly distributed on the support plate, overcomes the uneven stress and instability risk caused by relying on only a single inclined push rod, and guarantees the safety and reliability of the support operation.

[0018] 2. The prestressed anchor cable interlocking pile deep foundation pit support structure provided by the present application, through the setting of the inclined support mechanism and the setting of the fixing mechanism, the inclined support mechanism provides additional counter support force for deep foundation pit support work, the ground pile support is a conical or sharp structure, which is convenient to insert into the soil at the bottom of the foundation pit, and can be effectively anchored in the stable soil layer after deepening, forming a reliable counterforce support point, which cooperates with the support protection mechanism to jointly bear the support load, improves the stability and bearing capacity of the overall structure, and the setting of the fixing mechanism can change the inclination angle of the reinforcing support rod, thereby optimizing the stress state, so that the inclined support mechanism can maintain the best support effect under different geological conditions, the quick locking of the sliding seat can be completed without additional tools, and the operation is simple, efficient and reliable, and can resist loosening under vibration and long-term load.

[0019] 3. The prestressed anchor cable interlocking pile deep foundation pit support structure provided by the present application, through the setting of the connecting mechanism, the organic linkage and force system integration between the support protection mechanism and the inclined support mechanism are realized, the overall stiffness and dynamic response capability of the support system are further improved, the connecting mechanism serves as a force transmission hub, effectively integrates the lateral thrust received by the support plate and the counter support force provided by the inclined support mechanism, and the two form a counterattack at the connecting frame, thereby enhancing the overall bending and shearing resistance of the structure, avoiding the instability phenomenon caused by excessive unilateral stress, and the overall structure layout is reasonable, the components work cooperatively, not only improves the support efficiency and safety, but also has good environmental adaptability and long-term stability, and is suitable for deep foundation pit support work under various complex working conditions. BRIEF DESCRIPTION OF DRAWINGS

[0020] The present application will be further described below with reference to the accompanying drawings.

[0021] Figure 1 is a perspective view of the present application; Figure 2 is a side view of the present application; Figure 3 is a structure schematic view of the moving seat in the present application; Figure 4 is a structure schematic view of the connecting rod in the present application; Figure 5 is a structure schematic view of the inclined insertion rod in the present application; Figure 6 is a structure schematic view of the sliding seat in the present application; Figure 7 is a structure schematic view of the protection shell in the present application.

[0022] In the diagram: 1. Protective base; 2. Support plate; 3. L-shaped plate; 4. Vertical block; 5. Rotating seat; 6. Connecting frame; 7. Support plate; 8. Connecting rod; 9. Threaded rod; 10. Fixed long plate; 11. Moving seat; 12. Fixed seat; 13. Drive motor; 14. Slide groove; 15. Sliding block; 16. Rotating rod; 17. First bevel gear; 18. Second bevel gear; 19. Connecting plate; 20. Diagonal brace plate; 21. Telescopic rod; 22. First spring; 23. Vertical pole; 24. Diagonal insertion rod; 25. Ground spike support; 26. Support seat; 27. Sliding seat; 28. Reinforcing support rod; 29. ​​Mounting hole; 30. Protective shell; 31. Fixed insertion rod; 32. Second spring; 33. Grip end; 34. Mounting groove; 35. Baffle. Detailed Implementation

[0023] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0024] Example 1: As Figures 1 to 7 As shown in the embodiment of the present invention, a deep foundation pit support structure for prestressed anchor cable interlocking piles includes a protective base 1, a support plate 2 is provided above the protective base 1, a rotating seat 5 is fixedly connected to both sides of the bottom of the support plate 2, two upright blocks 4 are fixedly connected to one side of the top of the protective base 1, and a support and protection mechanism is provided in the inner cavity of the protective base 1. The support and protection mechanism includes several fixed seats 12. The inner cavity of the protective base 1 is provided with several threaded rods 9. The outer ring of the threaded rods 9 is fitted with a movable seat 11 through a thread. Several connecting rods 8 are provided on the top of the protective base 1. A fixed long plate 10 is fixedly connected to the bottom of the inner cavity of the protective base 1. One end of the threaded rod 9 passes through a bushing and is fixedly connected to a first bevel gear 17 on one side of the adjacent fixed long plate 10. A rotating rod 16 is provided in the inner cavity of the protective base 1. Several second bevel gears 18 are fitted on the outer ring of the rotating rod 16.

[0025] The two sides of the upright block 4 are rotatably connected to the inner wall of the adjacent rotating seat 5 via rotating shafts. One side of the fixed seat 12 is fixedly connected to one side of the adjacent support plate 2. The two sides of the connecting rod 8 are rotatably connected to the inner wall of the adjacent movable seat 11 via rotating shafts. The two sides of the connecting rod 8 are rotatably connected to the inner wall of the adjacent fixed seat 12 via rotating shafts. The upright block 4 is rotatably connected to the rotating seat 5 via rotating shafts, forming the rotation fulcrum at the bottom of the support plate 2. The fixed seat 12 is fixed to the side wall of the support plate 2. The two ends of the connecting rod 8 are rotatably connected to the movable seat 11 and the fixed seat 12 via rotating shafts, forming a linkage transmission mechanism. When the movable seat 11 moves linearly under the drive of the threaded rod 9, it pushes the connecting rod 8 to tilt.

[0026] A slider 15 is fixedly connected to the bottom of the movable seat 11. Several grooves 14 are opened at the bottom of the inner cavity of the protective base 1. The outer surface of the slider 15 is slidably connected to the inner cavity of the corresponding groove 14. When the threaded rod 9 drives the movable seat 11 to move axially, the slider 15 slides synchronously in the groove 14, which restricts the movement trajectory of the movable seat 11 and prevents it from rotating or deviating during the movement.

[0027] The other end of the threaded rod 9 is rotatably connected to the inner wall of the adjacent protective base 1 via a rotating shaft. An L-shaped plate 3 is fixedly connected to one side of the protective base 1, and a drive motor 13 is fixedly installed on the inner wall of one side of the L-shaped plate 3. One end of the rotating rod 16 passes through the inner wall of the adjacent protective base 1 and is fixedly connected to the output shaft of the drive motor 13. The other end of the rotating rod 16 is rotatably connected to the inner wall of the adjacent protective base 1 via a rotating shaft. The drive motor 13 provides the power for the rotating rod 16 to rotate.

[0028] Working principle: When personnel are carrying out deep foundation pit support work, they first start the drive motor 13. The output shaft of the drive motor 13 drives the connected rotating rod 16 to rotate. As the rotating rod 16 rotates, the second bevel gear 18 on its outer ring rotates synchronously. Since the second bevel gear 18 meshes with the first bevel gear 17, the threaded rod 9 rotates under the drive of the first bevel gear 17. The threaded rod 9 engages with the threaded hole of the moving seat 11 through its outer ring thread, driving the moving seat 11 to make linear displacement along the axial direction of the threaded rod 9. The sliding block 15 at the bottom slides within the inner cavity of the groove 14, effectively limiting the displacement of the moving seat 11 and preventing it from deflecting during movement. This ensures a smooth and precise displacement process. As the moving seat 11 advances, the connecting rod 8 tilts under the push of the moving seat 11, forming a linkage transmission mechanism. The fixed seat 12 pushes the rotating seat 5 at the bottom of the support plate 2 to rotate around the vertical block 4 as the fulcrum, thereby causing the support plate 2 to gradually tilt and approach the side wall of the pit until its surface is tightly attached to the interlocking pile, thus achieving effective support for the side wall of the pit.

[0029] Example 2: Figures 1 to 7 As shown in the comparative embodiment one, another embodiment of the present invention is as follows: a diagonal bracing mechanism is provided above the protective base 1; the diagonal bracing mechanism includes a support plate 7, a plurality of uprights 23 are fixedly connected to the top of the support plate 7, a plurality of diagonal inserts 24 are provided on one side of the support plate 7, a ground spike brace 25 is fixedly connected to the bottom end of the diagonal inserts 24, a bracket seat 26 is fixedly connected to the outer wall of the diagonal inserts 24, a reinforcing support rod 28 is provided in the inner cavity of the bracket seat 26, a sliding seat 27 is slidably connected to the outer wall of the uprights 23, an installation groove 34 is provided on one side of the sliding seat 27, the ground spike brace 25 is inserted into the soil at the bottom of the foundation pit to form an anchor point, and the tilt angle of the reinforcing support rod 28 can be changed by adjusting the height of the sliding seat 27, thereby optimizing the direction and magnitude of the support force and enhancing the bottom support capacity.

[0030] The bottom of the support plate 7 is fixedly connected to the top of the protective base 1. Both sides of the reinforcing strut 28 are rotatably connected to the inner wall of the adjacent support seat 26 through a rotating shaft. Both sides of the reinforcing strut 28 are rotatably connected to the inner wall of the adjacent sliding seat 27 through a rotating shaft. The reinforcing strut 28 effectively shares the load borne by the inclined rod 24 during the support process.

[0031] A fixing mechanism is provided on one side of the sliding seat 27; the fixing mechanism includes a protective shell 30, a fixing rod 31 is provided in the inner cavity of the protective shell 30, a second spring 32 is sleeved on the outer ring of the fixing rod 31, a baffle 35 is sleeved on the outer ring of the fixing rod 31, and several mounting holes 29 are opened on one side of the upright 23. One end of the fixing rod 31 passes through the side wall of the adjacent sliding seat 27 and is inserted into the inner cavity of the corresponding mounting hole 29. The other end of the fixing rod 31 passes through the inner wall of the adjacent protective shell 30 and is fixedly connected to a grip end 33. The grip end 33 facilitates the pulling of the fixing rod 31 by personnel.

[0032] Both ends of the protective shell 30 are fixedly connected to one side of the corresponding sliding seat 27. One end of the second spring 32 is fixedly connected to the side wall of the corresponding sliding seat 27, and the other end of the second spring 32 is fixedly connected to one side of the corresponding baffle 35. One end of the second spring 32 is fixed to the side wall of the sliding seat 27, and the other end is fixed to the baffle 35 to ensure that the spring maintains axial force during compression and extension, avoiding deflection or jamming. The baffle 35 limits the movement range of the fixed insertion rod 31 to prevent it from falling off.

[0033] Working principle: The operator aligns the ground spike 25 with the ground at the bottom of the pit and inserts it forcefully to firmly embed it into the soil to provide reaction force support. Then, the operator holds the grip end 33 and pulls the fixed insertion rod 31 outward. At this time, the second spring 32 is compressed and drives the baffle 35 to move, displacing the inner cavity of the sliding seat 27 to the surface of the upright 23. Then, the sliding seat 27 is slid up and down along the upright 23 to adjust the angle between the reinforcing support rod 28 and the inclined insertion rod 24 to adapt to the appropriate support angle. When the appropriate position is reached, the grip end 33 is released. Under the elastic restoring force of the second spring 32, the fixed insertion rod 31 is inserted into the corresponding installation hole 29, completing the locking of the sliding seat 27 position, thereby ensuring that the reinforcing support rod 28 and the inclined insertion rod 24 form a stable support and provide continuous and reliable inclined support force.

[0034] Example 3: Figures 1 to 7As shown in the comparative embodiment one, another embodiment of the present invention is as follows: a connecting mechanism is provided above the protective base 1; the connecting mechanism includes a connecting frame 6, one side of the connecting frame 6 is fixedly connected to one side of the adjacent support plate 7 through a plurality of telescopic rods 21, a first spring 22 is sleeved on the outer ring of the telescopic rods 21, a plurality of inclined bracing plates 20 are fixedly connected to the bottom of the connecting frame 6, two adjacent movable seats 11 are fixedly connected through a connecting plate 19, the bottom of the inclined bracing plate 20 is fixedly connected to the top of the corresponding connecting plate 19, the connecting frame 6 moves synchronously with the displacement of the movable seat 11, and the telescopic rods 21 ensure that the connecting frame 6 and the support plate 7 are still connected while the movable seat 11 is displaced.

[0035] One end of the first spring 22 is fixedly connected to one side of the adjacent connecting frame 6, and the other end of the first spring 22 is fixedly connected to one side of the adjacent support plate 7. When the connecting frame 6 is displaced, the telescopic rod 21 can extend or retract, and the first spring 22 is compressed or stretched accordingly.

[0036] Working principle: Two adjacent movable seats 11 are fixedly connected by a connecting plate 19. The inclined brace plate 20 at the bottom of the connecting frame 6 is fixedly connected to the connecting plate 19, so that the connecting frame 6 can move synchronously with the displacement of the movable seats 11. The first spring 22 of the telescopic rod 21 is stretched or compressed during the movement of the connecting frame 6. When the support plate 2 is fully attached and the inclined brace mechanism is fixed, the entire support system forms an integrated structure in which the support protection mechanism provides the main thrust, the inclined brace mechanism provides the bottom reaction support, and the connecting mechanism realizes the linkage and force transmission of each component. During the support process, when the side wall of the foundation pit is subjected to external soil pressure, the pressure is transmitted to the support protection mechanism and the connecting mechanism through the support plate 2. At the same time, the force of the inclined brace mechanism and the force of the support protection mechanism, two forces in opposite directions, form a counterforce at the connecting mechanism, which effectively improves the deformation resistance and stability of the overall structure and realizes efficient and reliable support for the side wall of the deep foundation pit.

[0037] The terms "front," "back," "left," "right," "top," and "bottom" all refer to the figures in the accompanying drawings. Figure 1 Based on the perspective of the observer, the side of the device facing the observer is defined as the front, the left side of the observer is defined as the left, and so on.

[0038] In the description of this invention, it should be understood that the terms "center", "longitudinal", "lateral", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the scope of protection of this invention.

[0039] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A prestressed anchor cable and grouted pile deep foundation pit support structure, comprising a protective base (1), characterized in that: The upper part of the protection base (1) is provided with a support plate (2), both sides of the bottom of the support plate (2) are fixedly connected with rotating seats (5), one side of the top of the protection base (1) is fixedly connected with two vertical blocks (4), and the inner cavity of the protection base (1) is provided with a supporting protection mechanism. The supporting protection mechanism comprises a plurality of fixed seats (12), the inner cavity of the protection base (1) is provided with a plurality of threaded rods (9), the outer circle of the threaded rod (9) is provided with a moving seat (11) through a threaded sleeve, the upper part of the protection base (1) is provided with a plurality of connecting rods (8), the inner cavity bottom of the protection base (1) is fixedly connected with a fixed long plate (10), one end of the threaded rod (9) is fixedly connected with a first bevel gear (17) through an axle sleeve penetrating one side of the adjacent fixed long plate (10), the inner cavity of the protection base (1) is provided with a rotating rod (16), and the outer circle of the rotating rod (16) is sleeved with a plurality of second bevel gears (18).

2. The pre-stressed cable-bolted pile deep foundation pit supporting structure according to claim 1, characterized in that: Both sides of the vertical block (4) are rotatably connected with the inner walls of the adjacent rotating seats (5) through shafts, one side of the fixed seat (12) is fixedly connected with one side of the adjacent support plate (2), both sides of the connecting rod (8) are rotatably connected with the inner walls of the adjacent moving seats (11) through shafts, and both sides of the connecting rod (8) are rotatably connected with the inner walls of the adjacent fixed seats (12) through shafts.

3. The pre-stressed cable-belt pile deep foundation pit supporting structure according to claim 1, characterized in that: The bottom of the moving seat (11) is fixedly connected with a sliding block (15), a plurality of sliding grooves (14) are formed in the inner cavity bottom of the protection base (1), and the outer surface of the sliding block (15) is slidably connected with the inner cavities of the corresponding sliding grooves (14).

4. The pre-stressed cable-belt pile deep foundation pit supporting structure according to claim 1, characterized in that: The other end of the threaded rod (9) is rotatably connected with the inner wall of the adjacent protection base (1) through a shaft, one side of the protection base (1) is fixedly connected with an L-shaped plate (3), the inner wall of one side of the L-shaped plate (3) is fixedly installed with a driving motor (13), one end of the rotating rod (16) penetrates the inner wall of the adjacent protection base (1) and is fixedly connected with the output shaft of the driving motor (13), and the other end of the rotating rod (16) is rotatably connected with the inner wall of the adjacent protection base (1) through a shaft.

5. The pre-stressed cable-belt pile deep foundation pit supporting structure according to claim 1, characterized in that: The upper part of the protection base (1) is provided with a diagonal bracing mechanism; the diagonal bracing mechanism comprises a support plate (7), a plurality of vertical rods (23) are fixedly connected to the top of the support plate (7), a plurality of inclined insertion rods (24) are arranged on one side of the support plate (7), the bottom end of the inclined insertion rod (24) is fixedly connected with a ground pile support (25), the outer surface wall of the inclined insertion rod (24) is fixedly connected with a bracket seat (26), the inner cavity of the bracket seat (26) is provided with a reinforcing support rod (28), the outer surface wall of the vertical rod (23) is slidably connected with a sliding seat (27), and the sliding seat (27) is provided with a mounting groove (34) on one side.

6. The pre-stressed cable-bolted pile supported deep foundation pit retaining structure according to claim 5, characterized in that: The bottom of the support plate (7) is fixedly connected with the top of the protection base (1), the two sides of the reinforcing support rod (28) are rotationally connected with the inner walls of the adjacent support seats (26) through pivots, and the two sides of the reinforcing support rod (28) are rotationally connected with the inner walls of the adjacent sliding seats (27) through pivots.

7. The pre-stressed cable-bolted pile deep foundation pit supporting structure according to claim 5, characterized in that: One side of the sliding seat (27) is provided with a fixing mechanism; the fixing mechanism comprises a protection shell (30), a fixing plug rod (31) is arranged in the inner cavity of the protection shell (30), a second spring (32) is sleeved on the outer circle of the fixing plug rod (31), a baffle (35) is sleeved on the outer circle of the fixing plug rod (31), a plurality of mounting insertion holes (29) are formed in one side of the vertical rod (23), one end of the fixing plug rod (31) penetrates through the side wall of the adjacent sliding seat (27) and is inserted into the inner cavity of the corresponding mounting insertion hole (29), and the other end of the fixing plug rod (31) penetrates through the inner wall of the adjacent protection shell (30) and is fixedly connected with a holding end portion (33).

8. The pre-stressed cable-bolted pile deep foundation pit supporting structure according to claim 7, characterized in that: The two ends of the protection shell (30) are fixedly connected with one side of the corresponding sliding seat (27), one end of the second spring (32) is fixedly connected with the side wall of the corresponding sliding seat (27), and the other end of the second spring (32) is fixedly connected with one side of the corresponding baffle (35).

9. The pre-stressed cable-belt pile deep foundation pit support structure according to claim 1, characterized in that: The upper portion of the protection base (1) is provided with a connecting mechanism; the connecting mechanism comprises a connecting frame (6), one side of the connecting frame (6) is fixedly connected with one side of the adjacent support plate (7) through a plurality of telescopic rods (21), the outer circle of the telescopic rod (21) is sleeved with a first spring (22), the bottom of the connecting frame (6) is fixedly connected with a plurality of inclined support plates (20), and the adjacent two moving seats (11) are fixedly connected through a connecting plate (19); the bottom of the inclined support plate (20) is fixedly connected with the top of the corresponding connecting plate (19).

10. The pre-stressed cable-bolted pile deep foundation supporting structure according to claim 9, characterized in that: One end of the first spring (22) is fixedly connected with one side of the adjacent connecting frame (6), and the other end of the first spring (22) is fixedly connected with one side of the adjacent support plate (7).

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