Repeatable assembly type steel support for foundation pit construction

Abstract

The invention relates to the technical field of foundation pit supports, in particular to a repeatable assembly type steel support for foundation pit construction, which comprises an extension steel support, a butt joint steel support, a main steel support, an axial force supplement steel support, two jacks and two steel enclosing purlins, the butt joint steel support is fixedly connected with the main steel support, and the axial force supplement steel support is slidably connected with the inner wall of the main steel support; the two ends of the axial force supplementing steel support and the two ends of the extension steel support are fixedly connected with the jacks respectively. The quick dismounting and mounting mechanism is arranged to be linked with the anti-deformation mechanism, the axis of the extension steel support is limited, and the situation that when the axial force is insufficient, the joint of the extension steel support and the butt joint steel support collapses due to the gravity effect is prevented. Meanwhile, the gravity direction of the steel support is changed through a fixing plate on the gravity compensation axial force mechanism, the gravity of the steel support acts on a hinged plate downwards all the time, then a sliding plate and the axial force compensation steel support are driven to abut against the foundation pit, the installation time is shortened through the design, and the self-weight influence of the steel support is effectively controlled.

Description

Technical Field

[0001] The invention relates to the technical field of foundation pit supports, and in particular to a repeatably assembled steel support for foundation pit construction. Background Art

[0002] With the construction and development of cities, the development and utilization of underground space has become more and more extensive, and the excavation area and depth of foundation pits have also increased day by day. The scientificity and rationality of the horizontal structural design of foundation pit support have a huge impact on the subsequent main project construction. Reasonable calculation of support axial force is not only conducive to improving the economy of the support structure, but also convenient for real-time evaluation of the safety performance of the support during the foundation pit excavation process. However, for large foundation pits, due to the large support range, the large number of steel supports used, and the continuous change of support axial force as the excavation progresses, it is difficult to meet the support requirements by relying solely on the pre-calculation of axial force and the design of steel support length.

[0003] The patent with application number: CN202311297955.3 discloses a prestressed adjustment device for a steel support for foundation pit support. Both ends of the steel support are connected to the foundation pit side through steel purlins. An adjustment section that can be controlled to extend or shorten by an adjustment part is provided in the steel support. The prestressed adjustment device includes an adjustment part, which includes a sliding seat, a telescopic member and a clamping seat. The sliding seat is slidably connected to the steel purlin, so that the adjustment part can switch positions between different steel supports.

[0004] However, the above invention patent still has some shortcomings in actual use: 1. The connection of the extended steel support is still connected by a plurality of bolts, and when the axial force is insufficient, no corresponding anti-deformation mechanism is set. The bolts will be deformed due to the weight of the steel support itself, and finally it will be difficult to disassemble; 2. The axial force is increased by setting a prestressed pressure adjustment device, but while the installation difficulty increases, the dead weight of the steel support itself will also increase. Therefore, a repeatable assembled steel support for foundation pit construction is proposed to solve the above problems. Summary of the invention

[0005] The purpose of the present invention is to solve the problems in the background technology and to propose a repeatable assembled steel support for foundation pit construction.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions: A repeatable assembled steel support for foundation pit construction, comprising an extended steel support, a butt joint steel support, a main steel support, an axial force supplementary steel support, two jacks and two steel surrounding purlins, wherein the butt joint steel support and the main steel support are fixedly connected, the axial force supplementary steel support is slidably connected to the inner wall of the main steel support, both ends of the axial force supplementary steel support and the extended steel support are respectively fixedly connected to the jacks, the two jacks are respectively fixedly connected to the two steel surrounding purlins through two bearing seats, and the two steel surrounding purlins are installed on both sides of the foundation pit, and further comprising: The quick disassembly and assembly mechanism comprises an eccentric head, a butt joint and a first spring, wherein the eccentric head is fixedly connected to the eccentric shaft, the eccentric shaft is rotatably connected to the butt joint, the butt joint is fixedly connected to the butt steel support, and an integral driving assembly is arranged on the inner wall of the butt steel support; The anti-deformation mechanism comprises a support cam, a first spring and a clamping block, wherein the support cam is fixedly connected to the eccentric shaft, the clamping block is slidably connected to the butt-jointed steel support, and the first spring is fixedly connected between the clamping block and the butt-jointed steel support; The gravity axial force compensation mechanism comprises a sliding plate, a hinged plate, a mounting column and a mounting block, the sliding plate is slidably connected to the inner wall of the main steel support, the hinged plate is hinged to the sliding plate, the mounting block is fixedly connected to the main steel support, and the mounting column is fixedly connected to the mounting block; And an anti-loosening mechanism, which is installed on the gravity axial force compensation mechanism.

[0007] Preferably, a plurality of the quick disassembly and assembly mechanisms are provided and distributed in a circular array, a connecting section is fixedly connected to the end of the extended steel support, a docking hole is provided on the outer wall of the connecting section, and the number of the docking holes is consistent with the number of the quick disassembly and assembly mechanisms, and an anti-deformation groove is provided at the end of the extended steel support.

[0008] Preferably, the overall driving assembly includes a first gear, a telescopic slide rod, a bolt and a connecting seat, the first gear is rotatably connected to the outer wall of the docking steel support, the telescopic slide rod is fixedly connected to the first gear, the end of the telescopic slide rod away from the first gear is fixedly connected to the bolt, the outer wall of the bolt is threadedly connected to the connecting seat, and the connecting seat is fixedly connected to the docking steel support.

[0009] Preferably, the overall drive assembly also includes a rotating ring, an upper gear block group, a plurality of second gears and a plurality of first springs, the second gear of the locking rod is fixedly connected to a plurality of eccentric shafts respectively, the upper gear block group is fixedly connected to the rotating ring, a plurality of lower gear block groups are fixedly connected to the rotating ring, the lower gear block group is meshed with the corresponding second gear, the upper gear block group is meshed with the outer wall of the first gear, and the rotating ring is rotatably connected to the inner wall of the docking steel support.

[0010] Preferably, a baffle is fixedly connected to the inner wall of the main steel support, and a third spring is fixedly connected between the main steel support and the mounting block.

[0011] Preferably, the outer wall of the main steel support is fixedly connected to two fixed blocks, the outer wall of the steel purlin is fixedly connected to two fixed blocks, the bottom outer wall of the main steel support is fixedly connected to a fixed plate, the outer walls of the two fixed blocks are fixedly connected to a traction rope, and the traction rope passes through the fixed blocks and the baffle and is fixedly connected to the hinged plate.

[0012] Preferably, the anti-loosening mechanism includes a sliding cylinder, an inclined push plate and a second spring, the sliding cylinder is slidably connected to the outer wall of the mounting column, the inclined push plate is fixedly connected to the sliding cylinder, and the second spring is fixedly connected between the mounting block and the inclined push plate.

[0013] Preferably, the gravity axial force compensation mechanism also includes a connecting rod, an extrusion plate, a sliding seat, a resistance plate and a fourth spring. The connecting rod is slidably connected to the main steel support, and the end of the connecting rod is slidably connected to the inclined push plate through a set sliding groove and a sliding block. The sliding seat is slidably connected to the connecting rod, the resistance plate is fixedly connected to the extrusion plate, the extrusion plate is slidably connected to the sliding seat, and the fourth spring is fixedly connected between the extrusion plate and the fourth spring.

[0014] Compared with the existing technology, the present invention has the following beneficial effects: The present invention sets a quick disassembly and assembly mechanism and an anti-deformation mechanism to limit the axis of the extended steel support, preventing the connection between the extended steel support and the docking steel support from collapsing due to gravity when the axial force is insufficient. At the same time, the fixed plate on the gravity axial force supplementation mechanism is used to change the gravity direction of the steel support, so that the gravity of the steel support always acts downward on the hinge plate, pushing the hinge plate to continuously squeeze the sliding plate, thereby driving the sliding plate and the axial force supplementation steel support to press against the foundation pit. This design not only shortens the installation time, but also effectively controls the influence of the deadweight of the steel support. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention; Figure 2 It is a partial structural schematic diagram of the gravity axial force compensation mechanism of the present invention; Figure 3 The present invention Figure 2 A schematic diagram of the partially enlarged structure at center A; Figure 4 It is a schematic diagram of the internal structure of the butt-jointed steel support of the present invention; Figure 5 The present invention Figure 4 A schematic diagram of the partially enlarged structure at B in the middle; Figure 6 It is a schematic diagram of the overall drive assembly structure of the present invention; Figure 7 It is a schematic diagram of the internal structure of the main steel support of the present invention; Figure 8 The present invention Figure 7 A schematic diagram of the partially enlarged structure at C in the middle; Fig. 9 The present invention Figure 7 The schematic diagram of the local enlarged structure at D in the middle; Fig.10 It is a schematic diagram of the internal structure of the sliding seat of the present invention.

[0016] In the figure: 1. steel purlin; 2. bearing seat; 3. jack; 4. extended steel support; 5. connecting section; 6. butt joint steel support; 7. eccentric head; 8. butt joint; 9. fixed block 1; 10. main steel support; 11. sliding plate; 12. baffle; 13. mounting column; 14. traction rope; 15. axial force supplementary steel support; 16. fixed block; 17. extrusion plate; 18. sliding seat; 19. connecting rod; 20. hinged plate; 21. fixed plate; 22. butt joint hole; 23. anti-deformation groove; 24. third spring; 25 , eccentric shaft; 26, rotating ring; 27, supporting cam; 28, first spring; 29, block; 30, mounting block; 31, second spring; 32, first gear; 33, telescopic slide rod; 34, bolt; 35, connecting seat; 36, contact plate; 37, second gear; 38, lower gear block group; 39, upper gear block group; 40, sliding cylinder; 41, inclined push plate; 42, fourth spring; 101, quick disassembly and assembly mechanism; 202, anti-deformation mechanism; 303, anti-loosening mechanism; 404, gravity axial force compensation mechanism. DETAILED DESCRIPTION

[0017] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0018] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0019] Reference Figure 1-Figure 10 A repeatable assembled steel support for foundation pit construction, comprising an extended steel support 4, a butt steel support 6, a main steel support 10, an axial force supplementary steel support 15, two jacks 3 and two steel purlins 1, the butt steel support 6 and the main steel support 10 are fixedly connected, the axial force supplementary steel support 15 is slidably connected to the inner wall of the main steel support 10, the two ends of the axial force supplementary steel support 15 and the extended steel support 4 are respectively fixedly connected to the jacks 3, the two jacks 3 are respectively fixedly connected to the two steel purlins 1 through two bearing seats 2, and the two steel purlins 1 are installed on both sides of the foundation pit, and also includes: The quick disassembly and assembly mechanism 101 comprises an eccentric head 7, a docking head 8 and a first spring 28, wherein the eccentric head 7 is fixedly connected to the eccentric shaft 25, the eccentric shaft 25 is rotatably connected to the docking head 8, the docking head 8 is fixedly connected to the docking steel support 6, and an integral driving assembly is arranged on the inner wall of the docking steel support 6; The anti-deformation mechanism 202 includes a support cam 27, a first spring 28 and a clamping block 29, wherein the support cam 27 is fixedly connected to the eccentric shaft 25, the clamping block 29 is slidably connected to the butt-jointed steel support 6, and the first spring 28 is fixedly connected between the clamping block 29 and the butt-jointed steel support 6; The gravity axial force compensation mechanism 404 includes a sliding plate 11, a hinged plate 20, a mounting column 13 and a mounting block 30. The sliding plate 11 is slidably connected to the inner wall of the main steel support 10, the hinged plate 20 is hinged to the sliding plate 11, the mounting block 30 is fixedly connected to the main steel support 10, and the mounting column 13 is fixedly connected to the mounting block 30; And an anti-loosening mechanism 303 , which is installed on the gravity axial force compensation mechanism 404 .

[0020] Among them, there are several quick disassembly and assembly mechanisms 101, and the quick disassembly and assembly mechanisms 101 are distributed in a circular array. The end of the extended steel support 4 is fixedly connected with a connecting section 5, and the outer wall of the connecting section 5 is provided with docking holes 22. The number of the docking holes 22 is consistent with that of the quick disassembly and assembly mechanisms 101. The end of the extended steel support 4 is provided with an anti-deformation groove 23.

[0021] Among them, the overall driving assembly includes a first gear 32, a telescopic slide rod 33, a bolt 34 and a connecting seat 35. The first gear 32 is rotatably connected to the outer wall of the docking steel support 6, the telescopic slide rod 33 is fixedly connected to the first gear 32, the end of the telescopic slide rod 33 away from the first gear 32 is fixedly connected to the bolt 34, the outer wall of the bolt 34 is threadedly connected to the connecting seat 35, and the connecting seat 35 is fixedly connected to the docking steel support 6.

[0022] Among them, the overall driving assembly also includes a rotating ring 26, an upper tooth block group 39, a plurality of second gears 37 and a plurality of first springs 28. The second gears 37 of the locking rod are respectively fixedly connected to the plurality of eccentric shafts 25. The upper tooth block group 39 is fixedly connected to the rotating ring 26. The plurality of lower tooth block groups 38 are all fixedly connected to the rotating ring 26. The lower tooth block group 38 is meshed with the corresponding second gear 37. The upper tooth block group 39 is meshed with the outer wall of the first gear 32. The rotating ring 26 is rotatably connected to the inner wall of the docking steel support 6.

[0023] When the eccentric head 7 passes through the docking hole 22, the end of the extended steel support 4 also extends into the docking steel support 6. Then the worker turns the bolt 34, and the bolt 34 is screwed into the connecting seat 35 toward the first gear 32. The telescopic slide rod 33 is compressed. At the same time, the first gear 32 rotates through the upper gear block group 39 to drive the rotating ring 26 to rotate. The rotating ring 26 drives the second gear 37 to rotate through the lower gear block group 38. The second gear 37 drives the support cam 27 to rotate through the eccentric shaft 25. The protruding side of the support cam 27 squeezes the block 29, forcing the block 29 to extend into the anti-deformation groove 23, thereby limiting the axis of the extended steel support 4 and avoiding the collapse of the connection between the extended steel support 4 and the docking steel support 6 due to gravity when the axial force is insufficient.

[0024] The inner wall of the main steel support 10 is fixedly connected with a baffle 12 , and a third spring 24 is fixedly connected between the main steel support 10 and the mounting block 30 .

[0025] Among them, the outer wall of the main steel support 10 is fixedly connected to two fixed blocks 9, the outer wall of the steel purlin 1 is fixedly connected to two fixed blocks 16, the bottom outer wall of the main steel support 10 is fixedly connected to a fixed plate 21, and the outer walls of the two fixed blocks 9 are fixedly connected to a traction rope 14, and the traction rope 14 passes through the fixed block 16 and the baffle 12 and is fixedly connected to the hinged plate 20.

[0026] Among them, the anti-loosening mechanism 303 includes a sliding cylinder 40, an inclined push plate 41 and a second spring 31. The sliding cylinder 40 is slidably connected to the outer wall of the mounting column 13, the inclined push plate 41 is fixedly connected to the sliding cylinder 40, and the second spring 31 is fixedly connected between the mounting block 30 and the inclined push plate 41.

[0027] In this embodiment, since the eccentric head 7 and the eccentric shaft 25 are eccentrically arranged relative to the docking joint 8, the eccentric head 7 naturally presses the connecting section 5 against the docking steel support 6 after rotation, completing the rapid docking, and then the sliding seat 18 is moved downward, and the extrusion plate 17 and the contact plate 36 squeeze the bolt 34 to prevent the bolt 34 from falling out.

[0028] Among them, the gravity axial force compensation mechanism 404 also includes a connecting rod 19, an extrusion plate 17, a sliding seat 18, a resistance plate 36 and a fourth spring 42. The connecting rod 19 is slidably connected to the main steel support 10, and the end of the connecting rod 19 is slidably connected to the inclined push plate 41 through the set sliding groove and sliding block. The sliding seat 18 is slidably connected to the connecting rod 19, the resistance plate 36 is fixedly connected to the extrusion plate 17, the extrusion plate 17 is slidably connected to the sliding seat 18, and the fourth spring 42 is fixedly connected between the extrusion plate 17 and the fourth spring 42.

[0029] In this embodiment, the connected steel support is connected to the bearing seats 2 on both sides, the pressure of the jack 3 is adjusted, and then the traction rope 14 is hung on the fixed block 16. The fixed block 16 can be in the form of a hook. The traction rope 14 is set to be in a taut state after being hung on the fixed block 16. Therefore, when the foundation pit is deformed and the pressure of the jack 3 is insufficient, the traction rope 14 between the fixed block 16 and the fixed block 9 is pulled by the gravity of the steel support itself, and the direction of the force is changed through the fixed plate 21, so that the gravity acts on On the hinged plate 20, the gravity of the steel support always pulls the hinged plate 20 downward, so that the hinged plate 20 will always squeeze the sliding plate 11, driving the sliding plate 11 and the axial force supplementary steel support 15 to squeeze the foundation pit. In the initial state, the sliding plate 11 is close to the baffle 12. At the same time, when the hinged plate 20 moves downward, it will also drive the sliding cylinder 40 and the inclined push plate 41 to move downward, so that the sliding seat 18, the extrusion plate 17 and the contact plate 36 on the connecting rod 19 squeeze the bolt 34, forming a limit for the bolt 34, thereby ensuring the stability of the connection.

[0030] The specific working principle and method of use of the present invention are explained in detail below: when in use, the sliding seat 18 is moved up along the connecting rod 19 so that the contact plate 36 will not block the bolt 34. At the same time, the extended steel support 4 is connected to the docking steel support 6. After the eccentric head 7 passes through the docking hole 22, the end of the extended steel support 4 also extends into the docking steel support 6. Then the worker turns the bolt 34, and the bolt 34 is screwed into the connecting seat 35 toward the first gear 32. The telescopic slide rod 33 is compressed. At the same time, the first gear 32 rotates through the upper gear block group 39 to drive the rotating ring 26 to rotate. The rotating ring 26 drives the second gear 37 to rotate through the lower gear block group 38. The second gear 37 drives the support cam 27 to rotate through the eccentric shaft 25. The protruding side of the support cam 27 squeezes the block 29, forcing the block 29 to extend into the anti-deformation groove 23, thereby limiting the axis of the extended steel support 4 to avoid the collapse of the connection between the extended steel support 4 and the docking steel support 6 due to the action of gravity when the axial force is insufficient.

[0031] At the same time, since the eccentric head 7 and the eccentric shaft 25 are eccentrically arranged relative to the docking joint 8, the eccentric head 7 naturally presses the connecting section 5 against the docking steel support 6 after rotation, completing the rapid docking, and then the sliding seat 18 is moved down, and the extrusion plate 17 and the contact plate 36 squeeze the bolt 34 to prevent the bolt 34 from falling out.

[0032] Connect the connected steel support to the bearing seats 2 on both sides, adjust the pressure of the jack 3, and then hang the traction rope 14 on the fixed block 16. The fixed block 16 can be in the form of a hook. The traction rope 14 is set to be in a taut state after being hung on the fixed block 16. Therefore, when the foundation pit is deformed and the pressure of the jack 3 is insufficient, the traction rope 14 between the fixed block 16 and the fixed block 9 is pulled by the gravity of the steel support itself, and the direction of the force is changed through the fixed plate 21, so that the gravity acts on the hinge plate 2. 0, so the gravity of the steel support always pulls the hinge plate 20 downward, so that the hinge plate 20 will always squeeze the sliding plate 11, drive the sliding plate 11 and the axial force supplementary steel support 15 to squeeze the foundation pit, and in the initial state, the sliding plate 11 is close to the baffle 12. At the same time, when the hinge plate 20 moves downward, it will also drive the sliding cylinder 40 and the inclined push plate 41 to move downward, so that the sliding seat 18, the extrusion plate 17 and the contact plate 36 on the connecting rod 19 squeeze the bolt 34, forming a limit for the bolt 34, thereby ensuring the stability of the connection.

[0033] It is further explained that the above-mentioned fixed connection should be understood in a broad sense unless otherwise clearly specified and limited. For example, it can be welding, gluing, or one-piece molding, etc., which are conventional means well known to those skilled in the art.

[0034] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A repeatable assembled steel support for foundation pit construction, comprising an extended steel support (4), a butt steel support (6), a main steel support (10), an axial force supplementary steel support (15), two jacks (3) and two steel purlins (1), wherein the butt steel support (6) and the main steel support (10) are fixedly connected, the axial force supplementary steel support (15) is slidably connected to the inner wall of the main steel support (10), the two ends of the axial force supplementary steel support (15) and the extended steel support (4) are respectively fixedly connected to the jacks (3), the two jacks (3) are respectively fixedly connected to the two steel purlins (1) through two bearing seats (2), and the two steel purlins (1) are installed on both sides of the foundation pit, characterized in that: Also includes: The quick disassembly and assembly mechanism (101) comprises an eccentric head (7), a docking head (8) and a first spring (28), the eccentric head (7) being fixedly connected to the eccentric shaft (25), the eccentric shaft (25) being rotatably connected to the docking head (8), the docking head (8) being fixedly connected to the docking steel support (6), and an integral driving assembly being arranged on the inner wall of the docking steel support (6); The anti-deformation mechanism (202) comprises a support cam (27), a first spring (28) and a clamping block (29), wherein the support cam (27) is fixedly connected to the eccentric shaft (25), the clamping block (29) is slidably connected to the butt-jointed steel support (6), and the first spring (28) is fixedly connected between the clamping block (29) and the butt-jointed steel support (6); The gravity axial force compensation mechanism (404) comprises a sliding plate (11), a hinged plate (20), a mounting column (13) and a mounting block (30), wherein the sliding plate (11) is slidably connected to the inner wall of the main steel support (10), the hinged plate (20) is hinged to the sliding plate (11), the mounting block (30) is fixedly connected to the main steel support (10), and the mounting column (13) is fixedly connected to the mounting block (30); and an anti-loosening mechanism (303), wherein the anti-loosening mechanism (303) is installed on the gravity axial force compensation mechanism (404).

2. The repeatable assembled steel support for foundation pit construction according to claim 1 is characterized in that: A plurality of the quick disassembly and assembly mechanisms (101) are provided, and the plurality of quick disassembly and assembly mechanisms (101) are distributed in a circular array; a connecting section (5) is fixedly connected to the end of the extended steel support (4); a docking hole (22) is provided on the outer wall of the connecting section (5); the number of the docking holes (22) is the same as the number of the quick disassembly and assembly mechanisms (101); and an anti-deformation groove (23) is provided at the end of the extended steel support (4).

3. The repeatable assembled steel support for foundation pit construction according to claim 1 is characterized in that: The overall driving assembly comprises a first gear (32), a telescopic slide rod (33), a bolt (34) and a connecting seat (35); the first gear (32) is rotatably connected to the outer wall of the butted steel support (6); the telescopic slide rod (33) is fixedly connected to the first gear (32); an end of the telescopic slide rod (33) away from the first gear (32) is fixedly connected to the bolt (34); the outer wall of the bolt (34) is threadedly connected to the connecting seat (35); and the connecting seat (35) is fixedly connected to the butted steel support (6).

4. The repeatable assembled steel support for foundation pit construction according to claim 3 is characterized by: The integral drive assembly further comprises a rotating ring (26), an upper tooth block group (39), a plurality of second gears (37) and a plurality of first springs (28); the second gears (37) of the locking rod are respectively fixedly connected to the plurality of eccentric shafts (25); the upper tooth block group (39) is fixedly connected to the rotating ring (26); the plurality of lower tooth block groups (38) are all fixedly connected to the rotating ring (26); the lower tooth block groups (38) are meshed with the corresponding second gears (37); the upper tooth block group (39) is meshed with the outer wall of the first gear (32); and the rotating ring (26) is rotatably connected to the inner wall of the docking steel support (6).

5. The repeatable assembled steel support for foundation pit construction according to claim 1 is characterized in that: A baffle (12) is fixedly connected to the inner wall of the main steel support (10), and a third spring (24) is fixedly connected between the main steel support (10) and the mounting block (30).

6. The repeatable assembled steel support for foundation pit construction according to claim 1 is characterized in that: The outer wall of the main steel support (10) is fixedly connected to two fixing blocks (9), the outer wall of the steel purlin (1) is fixedly connected to two fixing blocks (16), the bottom outer wall of the main steel support (10) is fixedly connected to a fixing plate (21), and the outer walls of the two fixing blocks (9) are fixedly connected to a traction rope (14), and the traction rope (14) passes through the fixing blocks (16) and the baffle (12) and is fixedly connected to the hinged plate (20).

7. The repeatable assembled steel support for foundation pit construction according to claim 1 is characterized in that: The anti-loosening mechanism (303) comprises a sliding cylinder (40), an inclined push plate (41) and a second spring (31); the sliding cylinder (40) is slidably connected to the outer wall of the mounting column (13); the inclined push plate (41) is fixedly connected to the sliding cylinder (40); and the second spring (31) is fixedly connected between the mounting block (30) and the inclined push plate (41).

8. The repeatable assembled steel support for foundation pit construction according to claim 7 is characterized in that: The gravity axial force compensation mechanism (404) further includes a connecting rod (19), an extrusion plate (17), a sliding seat (18), a contact plate (36) and a fourth spring (42), wherein the connecting rod (19) is slidably connected to the main steel support (10), the end of the connecting rod (19) is slidably connected to the inclined push plate (41) via a set slide groove and a sliding block, the sliding seat (18) is slidably connected to the connecting rod (19), the contact plate (36) is fixedly connected to the extrusion plate (17), the extrusion plate (17) is slidably connected to the sliding seat (18), and the fourth spring (42) is fixedly connected between the extrusion plate (17) and the fourth spring (42).

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