Reusable adjustable ultra-deep foundation pit steel supporting structure

Abstract

The invention relates to the technical field of foundation pit supporting, in particular to a reusable adjustable ultra-deep foundation pit steel supporting structure. An adjustable ultra-deep foundation pit steel supporting structure capable of being repeatedly used comprises a foundation pit baffle assembly, a transverse supporting assembly, a baffle bottom supporting assembly, an abutting adjusting plate and drilling equipment. The foundation pit baffle assembly is attached to the inner side face of a foundation pit in a covering mode, the baffle bottom supporting assembly is arranged on the bottom face of the foundation pit, one side of the baffle bottom supporting assembly is connected with the foundation pit baffle assembly, the transverse supporting assembly is arranged above the baffle bottom supporting assembly and horizontally arranged, and the two ends of the transverse supporting assembly are connected with the foundation pit baffle assemblies on the two sides respectively. The supporting mechanism of the device can provide multi-layer supporting layout for the foundation pit, has a stable supporting effect, can be adjusted according to the angle of the side wall of the foundation pit, is wide in application range, can meet turnover and repeated use, and has good economical efficiency. The adjustable ultra-deep foundation pit steel support is mainly applied to the aspect of reusable adjustable ultra-deep foundation pit steel supports.

Description

Technical Field

[0001] The present invention relates to the technical field of foundation pit support, and more specifically to a reusable and adjustable ultra-deep foundation pit steel support structure. Background Art

[0002] Deep foundation pit engineering plays a vital role in modern urban construction and large-scale infrastructure projects. With the continuous development and utilization of urban underground space, the scale of deep foundation pit engineering is expanding, and the construction difficulty and safety requirements are also increasing. Although traditional deep foundation pit support structures, such as concrete support structures, can meet construction needs to a certain extent, they have problems such as difficulty in demolition, waste of resources and high costs.

[0003] In order to overcome these limitations, steel structure support has gradually become the preferred solution in the field of deep foundation pit support. Steel structure support has been widely used in deep foundation pit projects due to its high strength, good rigidity, short construction period and high reusability. However, in practical applications, traditional steel structure support structures often have problems such as fixed design, difficult adjustment and poor applicability, which makes it difficult to meet complex and changing construction needs.

[0004] Traditional steel support structures are often unable to effectively cope with the huge horizontal loads generated by the side walls of the foundation pit. At the same time, their fixed design also limits the flexibility and adjustability during the construction process.

[0005] A Chinese utility model patent with publication number CN221399018U discloses a support structure in a foundation pit, which is provided with an adjustment mechanism. By turning the hand wheel, the threaded rod is driven to rotate. Under the limiting action of the sliding connection between the second U-shaped block and the slide groove, the threaded block can move to the left, which can push the second support plate to extend from the movable groove, thereby expanding the support height, so that it is suitable for supporting foundation pits of different depths. The support structure can adjust the support height, but cannot adjust the angle of the support plate according to the angle of the inner wall of the foundation pit, and cannot meet the needs of foundation pit support with different angles and slopes. Summary of the invention

[0006] In order to overcome the deficiencies in the above-mentioned prior art, the present invention provides a reusable and adjustable ultra-deep foundation pit steel support structure. The support mechanism can provide a multi-level support layout for the foundation pit, has a stable support effect, can be adjusted according to the angle of the foundation pit side wall, has strong adaptability, a wide range of applications, and can meet the needs of turnover and reuse, and has good economic efficiency.

[0007] In order to solve the above technical problems, the technical solution adopted by the present invention is: A reusable and adjustable ultra-deep foundation pit steel support structure, comprising a foundation pit baffle assembly, a cross brace assembly, a baffle bottom support assembly, a tightening adjustment plate and a drilling device; The foundation pit baffle assembly is placed on the inner side of the foundation pit in a close-fitting manner, the baffle bottom support assembly is arranged on the bottom surface of the foundation pit, one side of the baffle bottom support assembly is connected to the foundation pit baffle assembly, the cross support assembly is arranged above the baffle bottom support assembly, the cross support assembly is arranged horizontally, and both ends of the cross support assembly are respectively connected to the foundation pit baffle assemblies on both sides; The baffle bottom support assembly includes a base plate, a movable pressure plate, a sliding hinge seat, a movable connecting rod and a shock-absorbing joint. The movable pressure plate is hinged on a side of the base plate close to the foundation pit baffle assembly. The sliding hinge seat is movably arranged on the base plate. Both ends of the movable connecting rod are respectively hinged to the sliding hinge seat and the movable pressure plate. The movable connecting rod and the movable pressure plate are connected through the shock-absorbing joint. The tightening adjustment plate is arranged on the movable pressure plate, and the drilling equipment is arranged on the base plate.

[0008] The foundation pit baffle assembly includes multiple groups of supporting baffles, which are hinged into a whole through hinges. The two side edges of the supporting baffles are respectively provided with snap-fitting protrusions and snap-fitting grooves, and the snap-fitting protrusions and the snap-fitting grooves are matched.

[0009] A rubber shock-isolating cushion layer is arranged on the engaging protrusion.

[0010] The cross brace assembly includes a cross brace hinged seat, a connecting short rod and a cross brace connecting rod. The cross brace hinged seat is fixedly arranged on the support baffle, the connecting short rod is connected to the cross brace hinged seat, and the two ends of the cross brace connecting rod are respectively connected to the connecting short rods on both sides through flanges. The cross brace hinged seat is arranged in multiple groups at different height positions on the central axis of the support baffle.

[0011] A limiting plate is arranged on the bottom plate, a stepping motor is arranged on the side of the limiting plate away from the sliding hinge seat, the output shaft of the stepping motor passes through the limiting plate and is connected to a lead screw, a sliding cylinder threadably connected to the lead screw is fixedly arranged at the bottom of the sliding hinge seat, sliding rails are arranged on the bottom plates on both sides of the sliding hinge seat, and the sliding hinge seat can translate along the sliding rails.

[0012] The damping joint includes a damping plate, a damping hinge seat, a limiting column, a hinge rod and a movable sleeve. The damping hinge seat is fixedly arranged on the damping plate, the damping hinge seat is hinged to the movable connecting rod, the limiting column passes through the damping plate and is fixedly connected to the movable pressure plate, the damping plate is slidably arranged on the limiting column, a movable groove is provided on the movable pressure plate at a position corresponding to the damping plate, a threaded hole is provided on one side of the movable groove, a control screw is connected to the threaded hole, the movable sleeve is slidably arranged on the control screw, a damping spring is sleeved on the control screw between the movable sleeve and the side wall of the movable groove, and the movable sleeve is connected to the damping plate through the hinge rod.

[0013] The pressing adjustment plate includes a fixed frame and a pressing plate. The fixed frame is fixedly connected to the movable pressure plate. The side of the fixed frame away from the movable pressure plate is an opening structure. The pressing plate is slidably arranged on one side of the opening structure of the fixed frame. The pressing plate and the fixed frame are connected by an adjustment device.

[0014] The adjusting device comprises a threaded rod, a first bevel gear, a second bevel gear, a slide plate and a sliding adjusting device, the threaded rod is rotatably arranged in the fixed frame, the first bevel gear is fixedly arranged on the top of the threaded rod, the second bevel gear is meshed with the first bevel gear, and the second bevel gear is connected to a rotating disk, and the sliding adjusting device is provided with multiple groups on the threaded rod, and the sliding adjusting device comprises a tightening adjusting block and two groups of sliding blocks, the tightening adjusting block is fixedly arranged on the tightening plate, and the two groups of sliding blocks are slidably arranged on the threaded rod by a tightening adjusting rod, and the tightening adjusting block is connected to the sliding block by the tightening adjusting rod, and two ends of the tightening adjusting rod are respectively hinged to the tightening adjusting block and the sliding block, the slide plate is fixedly arranged on one side of an opening on the fixed frame, the sliding block is slidably arranged on the slide plate, and a cross rib plate is arranged between the tightening adjusting block and the tightening plate, and the cross rib plate is horizontally arranged.

[0015] Two groups of slide groove bases are symmetrically arranged on the bottom plate, and the slide groove bases adopt a U-shaped structure. The drilling equipment is slidably arranged on the slide groove bases, and a plurality of reserved holes are opened on the bottom plate around the slide groove bases.

[0016] The drilling equipment includes a sliding drilling frame, a drilling motor and a spiral drilling rod. The sliding drilling frame is slidably arranged on the slide groove base. A lifting device is arranged on the sliding drilling frame. The drilling motor is arranged on the lifting device. The drilling motor output shaft is arranged vertically downward. The spiral drilling rod is connected to the drilling motor output shaft.

[0017] Compared with the prior art, the present invention has the following beneficial effects: The foldable support baffle can be quickly deployed and installed, making the support baffle of the ultra-deep foundation pit easy to transport. The rubber seismic isolation pad can buffer the impact between adjacent support baffles, effectively ensuring the support stability of the foundation pit baffle assembly; the cross brace assembly can be flexibly set according to the inclination angle of the inner wall of the foundation pit to meet different construction scenarios. It can be set according to construction needs, and multiple sets of cross brace connecting rods can be set at different heights to enhance the support of the device; the baffle bottom support assembly can adjust the angle of the movable pressure plate according to the angle of the inner wall of the foundation pit, so that it fits the support baffle to apply pressure, and the adjustment plate can be pressed against the adjustment plate. Through simple operation, the pressure applied to the movable pressure plate is enhanced. Without moving the bottom plate, the movable pressure plate and the clamping plate can press the supporting baffle to ensure the stability of the foundation pit support; the shock-absorbing joint makes the device have a certain impact resistance. The shock-absorbing spring can absorb the impact of the movable pressure plate on the bottom plate. At the same time, the shock-absorbing sensitivity of the shock-absorbing joint can be adjusted and controlled by adjusting the position of the control screw; the bottom of the foundation pit can be drilled at the reserved hole position through the drilling equipment, and the anchor piles can be installed to complete the fixation of the bottom plate to ensure the stability of the baffle bottom support assembly. The support mechanism of this device can provide a multi-level support layout for the foundation pit, has a stable support effect, can be adjusted according to the angle of the side wall of the foundation pit, has strong adaptability, and a wide range of applications. At the same time, it can meet the requirements of turnover and repeated use, and has good economy. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A schematic diagram for use in the present invention; Figure 2 A schematic diagram of the use of the present invention in another scenario; Figure 3 It is a front view of the foundation pit baffle assembly of the present invention; Figure 4 It is a top view of the foundation pit baffle assembly of the present invention when it is folded; Figure 5 A top view of the baffle bottom support assembly of the present invention; Figure 6 It is a front view of the baffle bottom support assembly of the present invention; Figure 7 It is a side view of the baffle bottom support assembly of the present invention; Figure 8 It is a schematic diagram of the regulating device in the present invention; Fig. 9 It is a schematic diagram of the shock absorbing joint in the present invention; Fig.10 is a top view of the bottom plate of the present invention; In the figure: 1 is a foundation pit baffle assembly, 2 is a support baffle, 3 is a hinge, 4 is a snap-fitting protrusion, 5 is a snap-fitting groove, 6 is a rubber seismic isolation cushion, 7 is a cross brace assembly, 8 is a cross brace hinge seat, 9 is a connecting short rod, 10 is a cross brace connecting rod, 11 is a baffle bottom support assembly, 12 is a bottom plate, 13 is a movable pressure plate, 14 is a sliding hinge seat, 15 is a movable connecting rod, 16 is a limit plate, 17 is a stepping motor, 18 is a screw rod, 19 is a slide rail, 20 is a damping joint, 21 is a damping plate, 22 is a damping hinge seat, and 23 is a limit column , 24 is an articulated rod, 25 is a movable sleeve, 26 is a control screw, 27 is a shock-absorbing spring, 28 is a tightening adjustment plate, 29 is a fixed frame, 30 is a tightening plate, 31 is a threaded rod, 32 is a first bevel gear, 33 is a second bevel gear, 34 is a rotating disk, 35 is a slide plate, 36 is a tightening adjustment block, 37 is a sliding block, 38 is a tightening adjustment rod, 39 is a cross rib plate, 40 is a slide base, 41 is a drilling device, 42 is a sliding drilling frame, 43 is a drilling motor, 44 is a spiral drilling rod, and 45 is a reserved hole. DETAILED DESCRIPTION

[0019] In order to more clearly understand the above-mentioned purpose, features and advantages of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0020] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from the description. Therefore, the protection scope of the present invention is not limited to the specific embodiments disclosed below.

[0021] like Figures 1 to 10 As shown, a reusable adjustable ultra-deep foundation pit steel support structure includes a foundation pit baffle assembly 1, a cross brace assembly 7, a baffle bottom support assembly 11, a tightening adjustment plate 28 and a drilling device 41; The foundation pit baffle assembly 1 is placed on the inner side of the foundation pit in a close-fitting manner, the baffle bottom support assembly 11 is arranged on the bottom surface of the foundation pit, one side of the baffle bottom support assembly 11 is connected to the foundation pit baffle assembly 1, the cross support assembly 7 is arranged above the baffle bottom support assembly 11, the cross support assembly 7 is arranged horizontally, and both ends of the cross support assembly 7 are respectively connected to the foundation pit baffle assemblies 1 on both sides; The baffle bottom support assembly 11 includes a base plate 12, a movable pressure plate 13, a sliding hinge seat 14, a movable connecting rod 15 and a shock-absorbing joint 20. The movable pressure plate 13 is hingedly arranged on one side of the base plate 12 close to the foundation pit baffle assembly 1. The sliding hinge seat 14 is movably arranged on the base plate 12. Both ends of the movable connecting rod 15 are respectively hinged to the sliding hinge seat 14 and the movable pressure plate 13. The movable connecting rod 15 is connected to the movable pressure plate 13 through the shock-absorbing joint 20. The tightening adjustment plate 28 is arranged on the movable pressure plate 13, and the drilling equipment 41 is arranged on the base plate 12.

[0022] The foundation pit baffle assembly 1 is fitted on the inner wall of the foundation pit. According to the position of the foundation pit baffle assembly 1, the baffle bottom support assembly 11 is installed to fit the foundation pit baffle assembly 1 tightly on the inner wall of the foundation pit. The movable pressure plate 13 is adjusted to an angle to fit with the support baffle 2. The bottom plate 12 is fixed to the bottom surface of the foundation pit. The movable connecting rod 15 presses the movable pressure plate 13 tightly, and the cross support assembly 7 is installed in the foundation pit to further strengthen the support stability of the foundation pit by the foundation pit baffle assembly 1.

[0023] Preferably, the foundation pit baffle assembly 1 includes multiple groups of support baffles 2, which are hinged into a whole by hinges 3, and the two sides of the support baffles 2 are respectively provided with snap-fitting protrusions 4 and snap-fitting grooves 5, which are matched with each other. The support baffles 2 are transported to the foundation pit in a folded state, and according to the construction design, the multiple groups of support baffles 2 are unfolded, and the multiple groups of support baffles 2 are unfolded into a plane through the connection of the snap-fitting protrusions 4 and the snap-fitting grooves 5, so that they are in contact with the inner wall of the foundation pit.

[0024] Preferably, a rubber vibration isolation pad 6 is provided on the engaging protrusion 4. The rubber vibration isolation pad 6 can provide a buffer for the connection between adjacent support baffles 2 when the support baffles 2 are unfolded and connected, and prevent the support baffles 2 from colliding and dislocating with each other, resulting in unstable support.

[0025] Preferably, the cross brace assembly 7 includes a cross brace hinge seat 8, a connecting short rod 9 and a cross brace connecting rod 10. The cross brace hinge seat 8 is fixedly arranged on the support baffle 2, the connecting short rod 9 is connected to the cross brace hinge seat 8, and the two ends of the cross brace connecting rod 10 are respectively connected to the connecting short rods 9 on both sides through flanges. The cross brace hinge seat 8 is provided with multiple groups at different height positions on the central axis of the support baffle 2. The cross brace hinge seat 8 is fixedly arranged on the support baffle 2 by bolts, and the connecting short rod 9 is hinged on the cross brace hinge seat 8. The connecting short rod 9 can adjust the angle at will. After the support baffles 2 on both sides are arranged, the connecting short rods 9 on the support baffles 2 correspond to each other. The cross brace connecting rod 10 of appropriate length is selected to connect the two corresponding connecting short rods 9 through flanges to achieve multi-level support for the ultra-deep foundation pit.

[0026] Preferably, a limit plate 16 is provided on the bottom plate 12, and a stepper motor 17 is provided on the side of the limit plate 16 away from the sliding hinge seat 14. The output shaft of the stepper motor 17 passes through the limit plate 16 and is connected to a screw rod 18. A slide cylinder threadedly connected to the screw rod 18 is fixedly provided at the bottom of the sliding hinge seat 14. Slide rails 19 are provided on the bottom plate 12 on both sides of the sliding hinge seat 14, and the sliding hinge seat 14 can translate along the slide rails 19. The stepper motor 17 drives the screw rod 18 to rotate, and under the action of the slide rail 19, the sliding hinge seat 14 translates within the range of the slide rail 19. Driven by the movable connecting rod 15, the angle of the movable pressing plate 13 is controlled to meet the support of the inner side wall of the foundation pit at different angles.

[0027] Preferably, the shock-absorbing joint 20 includes a shock-absorbing plate 21, a shock-absorbing hinge seat 22, a limiting column 23, a hinge rod 24 and a movable sleeve 25. The shock-absorbing hinge seat 22 is fixedly set on the shock-absorbing plate 21, and the shock-absorbing hinge seat 22 is hinged to the movable connecting rod 15. The limiting column 23 penetrates the shock-absorbing plate 21 and is fixedly connected to the movable pressure plate 13. The shock-absorbing plate 21 is slidably set on the limiting column 23. A movable groove is opened on the movable pressure plate 13 at a position corresponding to the shock-absorbing plate 21. A threaded hole is opened on one side of the movable groove, and a control screw 26 is connected to the threaded hole. The movable sleeve 25 is slidably set on the control screw 26. A shock-absorbing spring 27 is sleeved on the control screw 26 between the movable sleeve 25 and the side wall of the movable groove. The movable sleeve 25 and the shock-absorbing plate 21 are connected by a hinge rod 24. When the damping plate 20 applies pressure to the movable pressure plate 13, the damping plate 21 slides within the range of the limiting column 23, and the damping plate 21 is buffered under the action of the control screw and the damping spring 27, thereby improving the stability of the device. By adjusting the length of the control screw 26 inserted into the threaded hole in the movable groove, the exposed length of the control screw 26 in the movable groove can be changed. A baffle is provided at one end of the control screw 26 away from the threaded hole, and the baffle can limit the position of the damping spring. Changing the exposed length of the control screw 26 can adjust the initial deformation of the damping spring 27, thereby controlling the damping effect of the damping joint 20.

[0028] Preferably, the abutting adjustment plate 28 includes a fixed frame 29 and a abutting plate 30. The fixed frame 29 is fixedly connected to the movable pressing plate 13. The side of the fixed frame 29 away from the movable pressing plate 13 is an open structure. The abutting plate 30 is slidably arranged on the side of the opening structure of the fixed frame 29. The abutting plate 30 and the fixed frame 29 are connected by an adjustment device. The two sides of the abutting plate 30 are slidably fitted with the two sides of the opening of the fixed frame 29. The distance between the fixed frame 29 and the abutting plate 30 can be adjusted by the adjustment device, thereby controlling the adjustment of the movable pressing plate 13 by the abutting adjustment plate 28.

[0029] Preferably, the adjusting device comprises a threaded rod 31, a first bevel gear 32, a second bevel gear 33, a slide plate 35 and a sliding adjusting device. The threaded rod 31 is rotatably arranged in the fixed frame 29, the first bevel gear 32 is fixedly arranged on the top of the threaded rod 31, the second bevel gear 33 is meshed with the first bevel gear 32, the second bevel gear 33 is connected to a rotating disk 34, and the sliding adjusting device is provided with multiple groups on the threaded rod 31. The sliding adjusting device comprises a tight adjustment block 36 and two groups of sliding blocks 37. The tight adjustment block 36 The two sets of sliding blocks 37 are slidably set on the threaded rod 31 by means of threaded connection. The pressing adjustment block 36 and the sliding block 37 are connected by a pressing adjustment rod 38. The two ends of the pressing adjustment rod 38 are hinged to the pressing adjustment block 36 and the sliding block 37 respectively. The slide plate 35 is fixedly set on one side of the opening of the fixed frame 29. The sliding block 37 is slidably set on the slide plate 35. A transverse rib plate 39 is set between the pressing adjustment block 36 and the pressing plate 30, and the transverse rib plate 39 is set horizontally. The sliding block 37 is threadedly connected to the threaded rod 31, and the rotating disk 34 can drive the first bevel gear 32 and the second bevel gear 33 to rotate, thereby realizing the rotation of the threaded rod 31. When the threaded rod 31 rotates, the two sliding blocks 37 move toward or away from each other, and under the action of the tightening adjustment rod 38, the tightening adjustment block 36 and the tightening plate 30 are driven to translate, thereby realizing the tightening or loosening operation of the movable pressure plate 13. The setting of the cross rib plate 39 can make the force of the tightening adjustment block 36 more evenly distributed on the tightening plate 30.

[0030] Preferably, two groups of chute bases 40 are symmetrically arranged on the bottom plate 12, the chute bases 40 adopt a U-shaped structure, the drilling equipment 41 is slidably arranged on the chute bases 40, and a plurality of reserved holes 45 are opened on the bottom plate 12 around the chute bases 40. The drilling equipment 41 slides and shifts on the U-shaped chute bases 40, and drills holes for setting anchor piles on the bottom surface of the foundation pit through the reserved holes 45.

[0031] Preferably, the drilling equipment 41 includes a sliding drilling frame 42, a drilling motor 43 and an auger drilling rod 44. The sliding drilling frame 42 is slidably arranged on the slide base 40. A lifting device is arranged on the sliding drilling frame 42. The drilling motor 43 is arranged on the lifting device. The output shaft of the drilling motor 43 is arranged vertically downward. The auger drilling rod 44 is connected to the output shaft of the drilling motor 43. The lifting device can control the lifting and lowering of the drilling motor 43, thereby driving the auger drilling rod 44 to drill holes on the bottom surface of the foundation pit and set anchor piles.

[0032] The baffle bottom support assembly 11 is set on the inner side of the support baffle 2, and the stepper motor 17 is adjusted to adjust the angle of the movable pressure plate 13 and the tightening adjustment plate 28 through the connecting action of the movable connecting rod 15, so that the movable pressure plate 13 and the tightening adjustment plate 28 are pressed tightly and fit the support baffle 2. At this time, the construction personnel control the drilling equipment 41 to shift on the slide base 40, and drill holes in several reserved holes 45 to complete the installation and positioning of the anchor piles on the bottom plate 12. To further ensure the support of the support baffle 2 to the foundation pit, the rotating disk 34 is manually rotated to move the tightening plate 30 toward the support baffle 2, and pressure is applied to the support baffle 2 to enhance its support strength to the foundation pit. After the baffle bottom support assembly 11 is installed, the cross brace connecting rod 10 is used to connect the corresponding connecting short rods 9 to achieve a higher position of the foundation pit support operation. According to the foundation pit conditions, cross brace connecting rods 10 are selected to be erected in the foundation pits at different levels. After the foundation pit support is completed, the cross brace connecting rod 10 is removed from top to bottom, and then the rotating disk 34 is rotated to loosen the clamping plate 30, and the sliding hinge seat 14 is controlled to move backward to release the movable pressure plate 13 from the supporting baffle 2, and the bottom plate 12 is removed, and the baffle support assembly 11 is transported out of the foundation pit, and finally the supporting baffle 2 is folded and transported to the next foundation pit support point for recycling.

[0033] Only the preferred embodiments of the present invention are described in detail above, but the present invention is not limited to the above embodiments. Various changes can be made within the knowledge scope of ordinary technicians in this field without departing from the purpose of the present invention, and various changes should be included in the protection scope of the present invention.

Claims

1. A reusable and adjustable ultra-deep foundation pit steel support structure, characterized by: It comprises a foundation pit baffle assembly (1), a cross brace assembly (7), a baffle bottom brace assembly (11), a tightening adjustment plate (28) and a drilling device (41); The foundation pit baffle assembly (1) is placed in a close-fitting manner on the inner side surface of the foundation pit, the baffle bottom support assembly (11) is arranged on the bottom surface of the foundation pit, one side of the baffle bottom support assembly (11) is connected to the foundation pit baffle assembly (1), the cross support assembly (7) is arranged above the baffle bottom support assembly (11), the cross support assembly (7) is arranged horizontally, and the two ends of the cross support assembly (7) are respectively connected to the foundation pit baffle assemblies (1) on both sides; The baffle bottom support assembly (11) comprises a bottom plate (12), a movable pressure plate (13), a sliding hinge seat (14), a movable connecting rod (15) and a shock absorbing joint (20); the movable pressing plate (13) is hingedly arranged on a side of the bottom plate (12) close to the foundation pit baffle assembly (1); the sliding hinge seat (14) is movably arranged on the bottom plate (12); two ends of the movable connecting rod (15) are respectively hingedly connected to the sliding hinge seat (14) and the movable pressure plate (13); the movable connecting rod (15) and the movable pressure plate (13) are connected via the shock absorbing joint (20); the tightening adjustment plate (28) is arranged on the movable pressure plate (13); and the drilling equipment (41) is arranged on the bottom plate (12).

2. The reusable and adjustable ultra-deep foundation pit steel support structure according to claim 1 is characterized in that: The foundation pit baffle assembly (1) comprises a plurality of groups of support baffles (2), wherein the plurality of groups of support baffles (2) are hingedly connected to form a whole through hinges (3), and snap-fitting protrusions (4) and snap-fitting grooves (5) are respectively arranged on both sides of the support baffles (2), and the snap-fitting protrusions (4) and the snap-fitting grooves (5) are arranged in a matching manner.

3. The reusable and adjustable ultra-deep foundation pit steel support structure according to claim 2 is characterized in that: A rubber vibration isolation cushion layer (6) is provided on the engaging protrusion (4).

4. The reusable and adjustable ultra-deep foundation pit steel support structure according to claim 2 is characterized in that: The cross brace assembly (7) comprises a cross brace hinge seat (8), a connecting short rod (9) and a cross brace connecting rod (10); the cross brace hinge seat (8) is fixedly arranged on the support baffle (2); the connecting short rod (9) is connected to the cross brace hinge seat (8); both ends of the cross brace connecting rod (10) are respectively connected to the connecting short rods (9) on both sides via flanges; and a plurality of cross brace hinge seats (8) are respectively arranged at different height positions on the central axis of the support baffle (2).

5. The reusable and adjustable ultra-deep foundation pit steel support structure according to claim 1 is characterized in that: A limit plate (16) is arranged on the bottom plate (12), a stepper motor (17) is arranged on the side of the limit plate (16) away from the sliding hinge seat (14), an output shaft of the stepper motor (17) passes through the limit plate (16) and is connected to a screw rod (18), a slide cylinder threadedly connected to the screw rod (18) is fixedly arranged at the bottom of the sliding hinge seat (14), and slide rails (19) are arranged on the bottom plate (12) on both sides of the sliding hinge seat (14), and the sliding hinge seat (14) can translate along the slide rails (19).

6. The reusable and adjustable ultra-deep foundation pit steel support structure according to claim 1 is characterized in that: The damping joint (20) comprises a damping plate (21), a damping hinge seat (22), a limiting column (23), a hinge rod (24) and a movable sleeve (25); the damping hinge seat (22) is fixedly arranged on the damping plate (21); the damping hinge seat (22) is hinged to the movable connecting rod (15); the limiting column (23) passes through the damping plate (21) and is fixedly connected to the movable pressing plate (13); the damping plate (21) is slidably arranged on the limiting column (23) ), a movable groove is provided on the movable pressure plate (13) at a position corresponding to the shock absorbing plate (21), a threaded hole is provided on one side of the movable groove, a control screw (26) is connected to the threaded hole, the movable sleeve (25) is slidably arranged on the control screw (26), a shock absorbing spring (27) is sleeved on the control screw (26) between the movable sleeve (25) and the side wall of the movable groove, and the movable sleeve (25) and the shock absorbing plate (21) are connected via the hinge rod (24).

7. The reusable and adjustable ultra-deep foundation pit steel support structure according to claim 1 is characterized in that: The abutting adjustment plate (28) comprises a fixed frame (29) and a abutting plate (30); the fixed frame (29) is fixedly connected to the movable pressing plate (13); a side of the fixed frame (29) away from the movable pressing plate (13) is an open structure; the abutting plate (30) is slidably arranged on one side of the opening structure of the fixed frame (29); and the abutting plate (30) and the fixed frame (29) are connected via an adjustment device.

8. The reusable and adjustable ultra-deep foundation pit steel support structure according to claim 7 is characterized in that: The adjusting device comprises a threaded rod (31), a first bevel gear (32), a second bevel gear (33), a slide plate (35) and a sliding adjusting device. The threaded rod (31) is rotatably arranged in the fixed frame (29). The first bevel gear (32) is fixedly arranged at the top of the threaded rod (31). The second bevel gear (33) is meshed with the first bevel gear (32). The second bevel gear (33) is connected to a rotating disk (34). The sliding adjusting device is provided with a plurality of groups on the threaded rod (31). The sliding adjusting device comprises a pressing adjusting block (36) and two groups of sliding blocks (37). The pressing adjusting block (36) is fixedly arranged on the threaded rod (31). On the clamping plate (30), two groups of sliding blocks (37) are slidably arranged on the threaded rod (31) by means of threaded connection, the clamping adjustment block (36) and the sliding block (37) are connected via a clamping adjustment rod (38), and the two ends of the clamping adjustment rod (38) are respectively hinged to the clamping adjustment block (36) and the sliding block (37), the slide plate (35) is fixedly arranged on one side of the opening of the fixed frame (29), and the sliding block (37) is slidably arranged on the slide plate (35), and a transverse rib plate (39) is arranged between the clamping adjustment block (36) and the clamping plate (30), and the transverse rib plate (39) is arranged horizontally.

9. The reusable and adjustable ultra-deep foundation pit steel support structure according to claim 1, characterized in that: Two groups of slide groove bases (40) are symmetrically arranged on the bottom plate (12), the slide groove bases (40) are of a U-shaped structure, the drilling device (41) is slidably arranged on the slide groove bases (40), and a plurality of reserved holes (45) are opened on the bottom plate (12) around the slide groove bases (40).

10. The reusable and adjustable ultra-deep foundation pit steel support structure according to claim 9, characterized in that: The drilling equipment (41) comprises a sliding drilling frame (42), a drilling motor (43) and a spiral drilling rod (44); the sliding drilling frame (42) is slidably arranged on the slide groove base (40); a lifting device is arranged on the sliding drilling frame (42); the drilling motor (43) is arranged on the lifting device; an output shaft of the drilling motor (43) is arranged vertically downward; and the spiral drilling rod (44) is connected to the output shaft of the drilling motor (43).

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