Support replacing device for dismantling deep foundation pit support
By designing a multi-stage telescopic steel structure and an extrusion block expansion plate, the flexibility and adaptability issues of existing deep foundation pit support and dismantling devices have been resolved, enabling rapid assembly and disassembly and noiseless demolition, thereby improving construction efficiency and safety.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- DALI CONSTR GRP
- Filing Date
- 2025-04-25
- Publication Date
- 2026-05-19
AI Technical Summary
Existing deep foundation pit support replacement devices are inadequate in terms of flexibility, construction efficiency, and adaptability. They are difficult to adapt to changes in the distance between the foundation pit and the main structure, and require crushing or cutting during removal, resulting in low efficiency and noise pollution.
The structure employs a multi-stage telescopic steel profile, which uses threaded rods and gear shafts to achieve multi-stage telescopic support, adapting to changes in the distance between the foundation pit and the main structure. It also uses extrusion blocks and outward expansion plates to adapt to uneven contact surfaces, ensuring close force transmission and eliminating the need for breaking or cutting during dismantling.
It enables rapid disassembly and reuse, avoids construction waste and noise pollution, and improves the economy and safety of deep foundation pit construction.
Smart Images
Figure CN224259386U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the technical field of foundation pit construction equipment, and in particular to a replacement support device for dismantling deep foundation pit supports. Background Technology
[0002] The replacement support device for deep foundation pit support removal is a critical temporary structure used to temporarily transfer horizontal loads and maintain the stability of the retaining structure during the removal of the support structure within the foundation pit. Its core function is to ensure a smooth transition of stress on the support system through a "replace before removal" approach, preventing excessive deformation of the retaining wall (piles) due to sudden unloading of the support, which could lead to foundation pit collapse or surrounding ground subsidence and other engineering accidents. Traditional replacement support devices often use concrete replacement strips or fixed-length steel supports, which, while meeting basic load-bearing requirements, have significant shortcomings in terms of flexibility, construction efficiency, and adaptability.
[0003] Currently, a common type of support replacement device for deep foundation pit support removal employs an integral rigid structure, such as reinforced concrete supports or welded steel supports. These structures are typically non-adjustable monolithic components with a fixed length after installation, making them unable to adapt to changes in the distance between the foundation pit and the main structure. Furthermore, removal requires crushing or cutting operations, which are not only inefficient but also generate construction waste and noise pollution. Due to the lack of expansion and contraction adjustment capabilities, their applicability in complex conditions (such as irregularly shaped foundation pits or adjacent existing structures) is poor, hindering rapid disassembly and reuse, thus limiting the economy and safety of deep foundation pit construction.
[0004] Therefore, it is necessary to provide a replacement support device for the dismantling of deep foundation pit supports to solve the above-mentioned technical problems. Utility Model Content
[0005] In view of the problems existing in the prior art, this utility model provides a replacement support device for the dismantling of deep foundation pit supports.
[0006] The technical solution adopted by this utility model to solve its technical problem is: a replacement support device for dismantling deep foundation pit support, including a steel section, wherein the steel section is an I-beam, and flat plates are welded to both ends of the steel section. A fixing plate is installed in the middle of the end face of the two flat plates, and the fixing plate is fixed to the flat plate with high-strength bolts.
[0007] The end face of the fixed plate is welded with support rods in a rectangular pattern, and the end of the support rods is fixedly installed with a support part;
[0008] The support includes a positioning plate fixedly installed on the end face of the support rod. A through hole is opened in the center of the positioning plate. A threaded rod is rotatably installed in the through hole. A threaded sleeve is installed in the threaded area of the threaded rod. Support plates are symmetrically welded to the outer wall of the threaded sleeve. A positioning rectangular frame plate is welded to the end face of the positioning plate facing the threaded rod. A first rack is symmetrically arranged on one pair of faces of the inner side of the positioning rectangular frame plate. A first extended rectangular frame plate is welded to the end face of the support plate. One symmetrical outer wall of the first extended rectangular frame plate is close to the inner wall of the positioning rectangular frame plate. A rectangular hole is opened in the center of the other symmetrical outer wall of the first extended rectangular frame plate. A gear shaft is installed inside the rectangular hole. A second extended rectangular frame plate is inserted in the center of the inner side of the first extended rectangular frame plate. One pair of faces of the outer side of the second extended rectangular frame plate is close to the inner wall of the first extended rectangular frame plate. A second rack is symmetrically arranged on the outer wall of the second extended rectangular frame plate, and the gear shaft meshes with the first rack and the second rack. A sealing plate is fixedly installed on the end face of the second extended rectangular frame plate.
[0009] Preferably, a crossbar is welded to the end face of the sealing plate, and an abutment plate is welded to the end of the crossbar. A groove is provided at the center horizontal position of the end face of the abutment plate, and a through hole is provided at the center position of the groove. An extrusion block is inserted into the through hole. The extrusion block is formed by welding the end faces of a square block and an isosceles trapezoidal block. An expansion plate is symmetrically installed in the groove. The inner side of the expansion plate contacts the extrusion block but is not connected to it.
[0010] Preferably, a circular hole is provided in the center of the interior of the extrusion block, a circular rod is inserted into the circular hole, and one end of the circular rod is welded to the end face of the sealing plate.
[0011] Preferably, a receiving block is welded to the end face of the outer expansion plate, and a cylindrical block is welded to the end of the receiving block.
[0012] Preferably, support frames are symmetrically installed on the outer walls of the first and second extended rectangular frame plates, and rollers are rotatably installed inside the support frames, with the two rollers respectively abutting against the inner wall of the positioning rectangular frame plate and the inner wall of the first extended rectangular frame plate.
[0013] Preferably, the threaded rod has a hexagonal groove on one end face facing the fixing plate.
[0014] Preferably, the contact surfaces of the positioning rectangular frame plate, the first extended rectangular frame plate, and the second extended rectangular frame plate are all coated with lubricating grease.
[0015] Compared with related technologies, the replacement support device for dismantling deep foundation pit supports provided by this utility model has the following beneficial effects:
[0016] This invention provides a support replacement device for dismantling deep foundation pit supports. During the movement of the first extended rectangular frame plate, the gear shaft moves synchronously. The gear shaft rotates along the first rack, and after rotation, it gradually engages with the second rack, causing the second extended rectangular frame plate to be exposed relative to the first extended rectangular frame plate, achieving a two-stage expansion and contraction effect. The support replacement operation is completed when the sealing plate contacts the foundation pit support component. This multi-stage expansion and contraction effect can adapt to changes in the distance between the foundation pit and the main structure. Dismantling does not require crushing or cutting operations; dismantling can be completed simply by rotating the threaded rod, resulting in no construction waste or noise pollution. Furthermore, its rapid dismantling and reusability improves the economy and safety of deep foundation pit construction.
[0017] This utility model provides a support replacement device for the dismantling of deep foundation pit supports. During the support replacement operation, the end face of the compression block first contacts the foundation pit. As the support gradually extends, the compression block moves relative to the through hole. The hypotenuse of the isosceles trapezoidal region of the compression block presses against the two outward expansion plates, causing the two outward expansion plates to slide along the slide groove until the end face of the compression block is flush with the contact plate. Then the two outward expansion plates stop moving. This extended support method can adapt to uneven contact surfaces. That is, when there are bumps or inclinations on the surface of the foundation pit retaining structure, the two outward expansion plates increase the contact surface and compensate for the unevenness on the inner side by pads to ensure close contact and force transmission. At the same time, the large-area contact can evenly distribute the load and avoid the support replacement device from slipping, overturning or node failure due to uneven local force. Attached Figure Description
[0018] Figure 1 The construction of the overall structure of this utility model is currently underway;
[0019] Figure 2 This is a perspective view of the overall structure of this utility model;
[0020] Figure 3 This is a cross-sectional view of the clamping block support part of this utility model;
[0021] Figure 4 This utility model Figure 3 A magnified view of a portion of region A in the middle;
[0022] Figure 5 This is a schematic diagram of the structure of the support part of this utility model. Figure 1 ;
[0023] Figure 6 This is a schematic diagram of the structure of the support part of this utility model. Figure 2 ;
[0024] The following are the labeling elements in the diagram: 1. Structural steel, 2. Flat plate, 3. Fixing plate, 31. Support rod, 4. Support part, 41. Positioning plate, 42. Positioning rectangular frame plate, 43. First extended rectangular frame plate, 44. Second extended rectangular frame plate, 45. Sealing plate, 411. Through hole, 412. Threaded rod, 413. Threaded sleeve, 414. Support plate, 421. First rack, 431. Rectangular hole, 432. Gear shaft, 441. Second rack, 451. Crossbar, 452. Contact plate, 453. Slide groove, 454. Through hole, 455. Outward expansion plate, 456. Extrusion block, 457. Round hole, 458. Round rod, 459. Receiving block, 450. Cylindrical block, 46. Support frame, 47. Round hole. Detailed Implementation
[0025] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.
[0026] Furthermore, the terms used below are defined based on the functions of this utility model and may vary depending on the user's or operator's intent or convention. Therefore, these terms are defined based on the entire contents of this specification.
[0027] Please see Figures 1-6 The present invention provides a deep foundation pit support removal replacement device, which includes a steel section 1, wherein the steel section 1 is an I-beam, and two flat plates 2 are welded to both ends of the steel section 1. A fixing plate 3 is installed in the middle of the end face of the two flat plates 2, and the fixing plate 3 is fixed to the flat plates 2 by high-strength bolts.
[0028] The end face of the fixed plate 3 is welded with support rods 31 in a rectangular distribution. The multi-point support rods 31 can be evenly stressed. The fixed plate 3 is not easy to deform during the support operation. The end of the support rods 31 is fixedly installed with a support part 4.
[0029] The support part 4 includes a positioning plate 41 fixedly installed on the end face of the support rod 31. A through hole 411 is provided in the center of the interior of the positioning plate 41. A threaded rod 412 is rotatably installed in the through hole 411. A hexagonal groove is provided on the end face of the threaded rod 412 facing the fixed plate 3, so that the construction personnel can rotate the threaded rod 412 with a wrench.
[0030] A threaded sleeve 413 is fitted to the threaded area of the threaded rod 412. A support plate 414 is symmetrically welded to the outer wall of the threaded sleeve 413. A positioning rectangular frame plate 42 is welded to the end face of the positioning plate 41 facing the threaded rod 412. A first rack 421 is symmetrically arranged on one pair of opposing sides of the inner side of the positioning rectangular frame plate 42. A first extended rectangular frame plate 43 is welded to the end face of the support plate 414. One of the symmetrical outer walls of the first extended rectangular frame plate 43 is close to the inner wall of the positioning rectangular frame plate 42. That is, the inner wall of the first extended rectangular frame plate 43 can lock the position of the circumferential rotation of the positioning rectangular frame plate 42. When the threaded rod 412 is rotated, the threaded sleeve 413 moves along the threaded area path of the threaded rod 412. The support plate 414 and the first extended rectangular frame plate 43 move together with the threaded sleeve 413, so that the first extended rectangular frame plate 43 is exposed relative to the positioning rectangular frame plate 42, achieving the effect of first-level telescopic movement.
[0031] A rectangular hole 431 is provided at the center of the other symmetrical outer wall of the first extended rectangular frame plate 43. A gear shaft 432 is installed inside the rectangular hole 431. A second extended rectangular frame plate 44 is inserted at the center of the inner side of the first extended rectangular frame plate 43. One pair of the outer surfaces of the second extended rectangular frame plate 44 are in close contact with the inner wall of the first extended rectangular frame plate 43. The inner wall of the first extended rectangular frame plate 43 supports the outer wall of the second extended rectangular frame plate 44 to prevent relative sliding or shaking between the two.
[0032] The outer wall of the second extended rectangular frame plate 44 is symmetrically provided with a second rack 441, and the gear shaft 432 meshes with the first rack 421 and the second rack 441. A sealing plate 45 is fixedly installed on the end face of the second extended rectangular frame plate 44. In specific operation, the first extended rectangular frame plate 43 moves synchronously with the gear shaft 432 during its movement. The gear shaft 432 rolls and rotates along the first rack 421. After the gear shaft 432 rotates, it gradually meshes with the second rack 441, causing the second extended rectangular frame plate 44 to be exposed relative to the first extended rectangular frame plate 43, achieving a two-stage expansion and contraction effect. When the sealing plate 45 contacts the foundation pit support component, the support replacement operation can be completed. This multi-stage expansion and contraction effect can adapt to the changes in the distance between the foundation pit and the main structure. During dismantling, there is no need to rely on crushing or cutting operations. Dismantling can be completed simply by rotating the threaded rod 412. There is no construction waste or noise pollution. At the same time, its quick dismantling and assembly is reusable, which improves the economy and safety of deep foundation pit construction.
[0033] In another embodiment, see Figures 2-6 A crossbar 451 is welded to the end face of the sealing plate 45, and an abutment plate 452 is welded to the end of the crossbar 451. A groove 453 is provided at the center horizontal position on the end face of the abutment plate 452, and the cross section of the groove 453 can be as follows: Figure 4 As shown, it has an axial self-locking effect, and a through hole 454 is provided at the center of the slide groove 453.
[0034] An extrusion block 456 is inserted into the through hole 454. The extrusion block 456 is formed by welding the end faces of a square block and an isosceles trapezoidal block. An outer expansion plate 455 is symmetrically installed within the slide groove 453. The inner surface of the outer expansion plate 455 contacts but is not connected to the extrusion block 456. During operation, when replacing the support, the end face of the extrusion block 456 first contacts the foundation pit. As the support part 4 gradually extends, the extrusion block 456 moves relative to the through hole 454. The hypotenuse of the isosceles trapezoidal region of the extrusion block 456 aligns with the two outer expansion plates 455. The compression causes the two outward expansion plates 455 to slide along the slide groove 453 until the end face of the compression block 456 is flush with the contact plate 452. Then the two outward expansion plates 455 stop moving. This extended support method can adapt to uneven contact surfaces. That is, when there are bumps or inclinations on the surface of the foundation pit retaining structure, the two outward expansion plates 455 increase the contact surface and make up for the unevenness on the inside by padding, ensuring close contact and force transmission. At the same time, the large area of contact can evenly distribute the load and avoid the slippage, overturning or node failure of the support device due to uneven local force.
[0035] Meanwhile, during non-construction transfer or transportation, the two expansion plates 455 used to increase the contact area can be retracted into the slide groove 453, making the overall device occupy less space.
[0036] See Figures 2-6 The extrusion block 456 has a centrally located circular hole 457, and a circular rod 458 is inserted into the circular hole 457. One end of the circular rod 458 is welded to the end face of the sealing plate 45. When the extrusion block 456 moves, it will slide along the circular rod 458 to prevent the extrusion block 456 from falling off during installation.
[0037] Furthermore, such as Figure 6 As shown, a receiving block 459 is welded to the end face of the outer expansion plate 455, and a cylindrical block 450 is welded to the end of the receiving block 459. In this state, the movement of the extrusion block 456 will directly extrude the cylindrical block 450, reducing the surface wear of the extrusion block 456.
[0038] In another embodiment, see Figures 2-6 Support frames 46 are symmetrically installed on the outer walls of the first extended rectangular frame plate 43 and the second extended rectangular frame plate 44. Rollers 47 are rotatably installed inside the support frames 46. The rollers 47 at two positions are respectively close to the inner wall of the positioning rectangular frame plate 42 and the inner wall of the first extended rectangular frame plate 43. When the support part 4 is working and extending, the rollers 47 at each position will rotate and support the inner wall of the positioning rectangular frame plate 42 and the inner wall of the first extended rectangular frame plate 43, so that the outer surfaces of the first extended rectangular frame plate 43 and the second extended rectangular frame plate 44 are effectively supported and are not easily deformed during operation.
[0039] Meanwhile, lubricating grease is applied to the contact surfaces of the positioning rectangular frame plate 42, the first extended rectangular frame plate 43, and the second extended rectangular frame plate 44 to reduce the relative friction and wear between the contact surfaces of the positioning rectangular frame plate 42, the first extended rectangular frame plate 43, and the second extended rectangular frame plate 44.
[0040] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the content of this utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.
Claims
1. A support exchange device for deep foundation pit support dismantling, comprising a profile steel (1), characterized in that, The steel section (1) is an I-beam, and flat plates (2) are welded to both ends of the steel section (1). A fixing plate (3) is installed in the middle of the end face of the two flat plates (2), and the fixing plate (3) and the flat plate (2) are fixed with high-strength bolts. The end face of the fixed plate (3) is welded with support rods (31) in a rectangular pattern, and the end of the support rods (31) is fixedly installed with a support part (4). The support part (4) includes a positioning plate (41) fixedly installed on the end face of the support rod (31). A through hole (411) is provided in the center of the interior of the positioning plate (41). A threaded rod (412) is rotatably installed in the through hole (411). A threaded sleeve (413) is fitted on the threaded area of the threaded rod (412). A support plate (414) is symmetrically welded to the outer wall of the threaded sleeve (413). A positioning rectangular frame plate (42) is welded to the end face of the positioning plate (41) facing the threaded rod (412). A first rack (421) is symmetrically provided on one pair of the inner sides of the positioning rectangular frame plate (42). A first extended rectangular frame plate (43) is welded to the end face of the support plate (414). A pair of the first extended rectangular frame plates (43) are provided with... The outer wall is close to the inner wall of the positioning rectangular frame plate (42). A rectangular hole (431) is provided in the center of the other symmetrical outer wall of the first extended rectangular frame plate (43). A gear shaft (432) is installed inside the rectangular hole (431). A second extended rectangular frame plate (44) is inserted in the center of the inner side of the first extended rectangular frame plate (43). One pair of facades of the second extended rectangular frame plate (44) are close to the inner wall of the first extended rectangular frame plate (43). A second rack (441) is symmetrically arranged on the outer wall of the second extended rectangular frame plate (44). The gear shaft (432) meshes with the first rack (421) and the second rack (441). A sealing plate (45) is fixedly installed on the end face of the second extended rectangular frame plate (44).
2. The strutting device for deep foundation pit support dismantling according to claim 1, characterized in that, A crossbar (451) is welded to the end face of the sealing plate (45), and an abutment plate (452) is welded to the end of the crossbar (451). A groove (453) is provided at the center horizontal position on the end face of the abutment plate (452), and a through hole (454) is provided at the center position of the groove (453). An extrusion block (456) is inserted into the through hole (454). The extrusion block (456) is made by welding the end faces of a square block and an isosceles trapezoidal block. An outer expansion plate (455) is symmetrically installed in the groove (453). The inner side of the outer expansion plate (455) contacts the extrusion block (456) but is not connected.
3. The strutting device for deep foundation pit support dismantling according to claim 2, characterized in that, The extrusion block (456) has a circular hole (457) in the center, and a circular rod (458) is inserted into the circular hole (457), with one end of the circular rod (458) welded to the end face of the sealing plate (45).
4. The strutting device for deep foundation pit support dismantling according to claim 2, characterized in that, A receiving block (459) is welded to the end face of the outer expansion plate (455), and a cylindrical block (450) is welded to the end of the receiving block (459).
5. The strutting device for deep foundation pit support dismantling according to claim 1, characterized in that, The outer side walls of the first and second extended rectangular frame plates (43, 44) are symmetrically provided with support frames (46), and roller shafts (47) are rotatably arranged in the support frames (46) and abut against the inner walls of the positioning rectangular frame plate (42) and the first extended rectangular frame plate (43) respectively.
6. The strutting device for deep foundation pit support dismantling according to claim 1, characterized in that, A hexagonal groove is formed in the side end face of the fixed plate (3) facing the threaded rod (412).
7. The strutting device for deep foundation pit support according to claim 1, wherein, The contact surfaces of the positioning rectangular frame plate (42), the first and second extended rectangular frame plates (43, 44) are coated with lubricating grease.