Foundation pit prestress supporting structure and construction method thereof

Abstract

The invention relates to the field of geotechnical engineering, and provides a foundation pit prestress supporting structure which comprises a plurality of I-shaped steel piles installed in a foundation pit, a transverse baffle installed on the side wall of the foundation pit and a plurality of supporting columns, and the transverse baffle is connected with the I-shaped steel piles on one side of the foundation pit; the two ends of the supporting column are detachably connected with the two transverse baffles correspondingly. The transverse baffle is provided with a movable cavity, a movable plate is slidably installed in the movable cavity, the end of the supporting column is connected with the movable plate, and the transverse baffle is provided with a movable assembly used for driving the movable plate to move in the movable cavity. According to the foundation pit prestress supporting structure, the adjusting efficiency of the supporting columns is improved. The invention further provides a construction method of the foundation pit prestress supporting structure.

Description

Technical Field

[0001] The present application relates to the field of geotechnical engineering, and in particular to a prestressed support structure for a foundation pit and a construction method thereof. Background Art

[0002] The steel cross baffle support structure is a structural form widely used in shallow foundation pit support. It is mainly composed of I-beam piles, cross baffles, support columns and other components to form an efficient support system. This support method has the characteristics of convenient construction, fast speed and short construction period. It is particularly suitable for general clay or sandy soil layers with low groundwater level and small depth.

[0003] In the foundation pit support project, the construction steps are as follows: the pile driver is installed at a predetermined spacing and position to press the I-beam piles into the foundation, and then the cross baffle is connected to all the I-beam piles on one side of the foundation pit. In order to ensure the tightness between the cross baffle and the steel piles, wedges can be driven between the cross baffle and the steel piles; then the two ends of the support column are respectively connected to the two cross baffles. They usually use welding to connect the various components into one, forming a stable support system.

[0004] In order to improve the supporting effect of the structure, adjustment components are provided at both ends of the support column, and the two adjustment components are connected to the cross baffles respectively. By moving the two adjustment components toward the side away from the support column, the two ends of the support column can be pressed against the cross baffles on both sides, and the prestressed state of the support structure can be adjusted, effectively suppressing the deformation of the foundation pit and ensuring the safety of the project. However, it is troublesome to adjust each support column during installation, which reduces the work efficiency and needs to be improved. Summary of the invention

[0005] In order to improve the adjustment efficiency of support columns, the present application provides a foundation pit prestressed support structure and a construction method thereof.

[0006] In the first aspect, the present application provides a prestressed support structure for a foundation pit using the following technical solutions: A prestressed support structure for a foundation pit comprises a plurality of I-steel piles installed in the foundation pit, a transverse baffle installed on the side wall of the foundation pit and a plurality of support columns, wherein the transverse baffle is connected to the plurality of I-steel piles on one side of the foundation pit; the two ends of the support columns are detachably connected to two transverse baffles respectively; the transverse baffle is provided with a movable cavity, a movable plate is slidably installed in the movable cavity, the end of the support column is connected to the movable plate, and the transverse baffle is provided with a movable component for driving the movable plate to move in the movable cavity.

[0007] By adopting the above technical solution, after the I-beam, the cross baffle and the support column are installed in the foundation pit in sequence, the movable assembly at one end of the support column is driven to move the movable plate in the movable cavity toward one side of the support column, so that the position and tension of the support column connected to the movable plate can be adjusted, so that the prestress of the support structure can be adjusted, and the stability and bearing capacity of the device can be improved. The structure can adjust the support column connected to the movable plate at the same time, thereby improving the construction efficiency.

[0008] Optionally, the movable component includes a cylinder and a sliding rod, one end of the sliding rod is hinged to the inner wall of the movable cavity; the movable plate is vertically slidably installed with a sliding seat, the other end of the sliding rod is rotatably connected to the sliding seat, and the cylinder is installed on the upper wall of the cross baffle and connected to the sliding rod.

[0009] By adopting the above technical solution, by driving the movable plug of the cylinder, the sliding seat and the side wall of the movable plate can be driven to slide, and the movable plate can be driven to move closer to / away from one side of the support column in the movable cavity, so as to adjust the pressure of the structure on the side wall of the foundation pit.

[0010] Optionally, a plurality of through holes connected to the movable cavity are opened on one side of the cross baffle, and support plates connected to the movable plates are installed in all the through holes; the ends of the support columns are mounted on the top of the support plates, and the outer walls of the support columns are surrounded by blocking members, and the two ends of the blocking members are connected to the support plates by first bolts.

[0011] By adopting the above-mentioned technical solution, by setting up a support plate, the bottom of the support column can be supported, thereby increasing the stability of the support column installed between the two cross baffles; if the length of the support column is smaller than the spacing between the two cross baffles, the support plates of the two cross baffles can be erected on support columns of different sizes, thereby reducing the situation where the support column needs to be remade due to size inconsistency, thereby improving the practicality of the structure; and the structure can install the support column on the support plate by a first bolt, and the first bolt has a simple structure, so that the staff can assemble the support column and the support plate easily.

[0012] Optionally, a plurality of abutment blocks for supporting the bottom of the support column are movably installed on the upper surface of the support plate, and two adjacent abutment blocks abut against each other; a first spring is arranged between the abutment block and the support plate, and the elastic force of the first spring is used to drive the abutment block to move toward a side away from the support plate; and the end portions of the support column abut against the side walls of the abutment blocks.

[0013] By adopting the above-mentioned technical solution, after the two ends of the support column are erected above the two support plates, the local abutment block abuts against the bottom of the support column and moves toward the side away from the support plate; and the side wall of one of the abutment blocks abuts against the end of the support column, which can reduce the free movement of the support column between the two support plates.

[0014] Optionally, the movable component includes a motor, a first gear and a rack, the upper end of the rack is fixed to the upper end of the movable plate, the first gear is rotatably mounted on the inner wall of the movable cavity and meshes with the rack, and the motor is used to drive the first gear to rotate.

[0015] By adopting the above technical solution, the output shaft of the driving motor can move the first gear in the movable cavity. Since the first gear and the rack are meshed, the movable plate can move in the movable cavity to adjust the position of the support column.

[0016] Optionally, the first gear is connected via a rotating shaft, and a second gear is installed at one end of the rotating shaft away from the first gear; the output shaft of the motor is provided with a mounting block, and the mounting block has a first tooth groove for plugging the second gear; the cross baffle is provided with a fixing component for fixing the rotating shaft and the cross baffle.

[0017] By adopting the above technical solution, the first tooth groove and the second gear are plugged into each other to achieve a detachable connection between the motor and the cross baffle. During the transportation of the cross baffle, the motor can be removed to reduce damage to the cross baffle during transportation.

[0018] Optionally, the fixing assembly includes a second spring and a fixing ring, a fixing groove is provided on the upper surface of the cross baffle, the fixing ring is movably installed in the fixing groove and is sleeved on the outer wall of the second gear, and the fixing ring is provided with a second tooth groove for the second gear to be plugged in; the two ends of the second spring are respectively connected to the fixing ring and the bottom wall of the fixing groove, and the elastic force of the second spring is used to drive the fixing block to move toward the side away from the fixing groove.

[0019] By adopting the above-mentioned technical solution, when the first motor is connected to the baffle, the first tooth groove of the mounting block is sleeved on one side of the second gear. At this time, the mounting block is abutted against the fixing ring, and the fixing ring is moved toward the side close to the fixing groove, so that the second tooth groove of the fixing ring is disengaged from the plug-in with the second gear, so that the motor can drive the second gear to rotate; and during the rotation of the motor, the fixing ring can support the bottom of the mounting block, thereby improving the stability of the motor installed on the upper surface of the horizontal baffle.

[0020] In a second aspect, the present application provides a construction method for a prestressed foundation pit support structure, which specifically includes the following steps: S1, according to the drawings, drive the I-beam piles into the foundation pit in sequence, so that all the I-beam piles enclose a rectangle; and connect the cross baffle with all the I-beam piles on one side of the foundation pit; S2, connecting the two ends of the support column to the horizontal baffles on the opposite sides of the foundation pit; S3, opening the movable assembly on the horizontal baffle at one end of the support column, driving the movable plate to move in the movable cavity to change the position of the support column; S4, after use, remove the support columns, cross baffles and I-beam piles from the foundation pit in turn.

[0021] By adopting the above-mentioned technical solution, the positions of all the support columns connected to the movable plate can be changed, so that the cross baffles at both ends of the support columns can be pressed tightly against the I-beam piles; the problem of bending deformation caused by uneven force on the I-beam piles can be avoided, and the prestress of the support structure can be adjusted to improve the stability and bearing capacity of the device.

[0022] In summary, the present application includes at least one of the following beneficial technical effects: 1. By setting up a movable assembly, the movable plate can be moved in the movable cavity toward one side of the support column, thereby adjusting the position and tension of all support columns connected to the movable plate at the same time, improving construction efficiency; making it possible to adjust the prestress of the support structure and improve the stability and bearing capacity of the device; 2. By setting abutment blocks, after the two ends of the support column are erected above the two support plates, the local abutment blocks abut against the bottom of the support column and move toward the side away from the support plate; and the side wall of one of the abutment blocks abuts against the end of the support column, so that the support column is clamped between the abutment blocks of the two support plates, thereby reducing the free movement of the support column between the two support plates. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a schematic structural diagram of Example 1; Figure 2 is a partial cross-sectional view of the cow's foot of Example 1; Figure 3 is a partial cross-sectional view of the support plate of Example 1; Figure 4 is a partial cross-sectional view of the movable plate of Example 1; Figure 5 yes Figure 1 A local enlarged view of point a; Figure 6 This is a partial cross-sectional view of the transverse baffle of Example 2.

[0024] Description of the accompanying drawings: 1. I-beam pile; 11. Engaging portion; 12. Cow foot; 13. First threaded hole; 14. Second threaded hole; 15. Third bolt; 16. Anti-slip rod; 2. Cross baffle; 21. Active cavity; 22. Active plate; 23. Through hole; 24. Support plate; 25. Positioning groove; 26. Abutment groove; 27. Abutment block; 28. First spring; 29. ​​Fixed groove; 3. Support column; 31. Connecting pipe; 32. Connecting column; 33. Flange; 34. The second bolt; 35, the fourth bolt; 4, the movable component; 41, the cylinder; 42, the sliding rod; 43, the sliding seat; 44, the sliding block; 45, the motor; 451, the mounting block; 452, the first tooth groove; 46, the first gear; 47, the rack; 48, the rotating shaft; 49, the second gear; 5, the blocking member; 51, the third threaded hole; 52, the first threaded groove; 53, the first bolt; 6, the fixing component; 61, the fixing ring; 62, the second spring; 63, the second tooth groove. DETAILED DESCRIPTION

[0025] The following is combined with Figure 1-6 This application is described in further detail.

[0026] Embodiment 1: An embodiment of the present application discloses a prestressed support structure for a foundation pit.

[0027] Reference Figure 1 A prestressed supporting structure for a foundation pit comprises a plurality of I-beam piles 1 installed in the foundation pit, a transverse baffle 2 installed on the side wall of the foundation pit, and a plurality of supporting columns 3. The plurality of I-beam piles 1 are installed on the inner side wall of the foundation pit; a bite portion 11 is integrally formed at both ends of the I-beam pile 1, and the bite portions 11 of two adjacent I-beam piles 1 are bite-fitted with each other, so that all the I-beam piles 1 are integrated, thereby increasing the stability of the I-beam piles 1 in the foundation pit.

[0028] Reference Figure 2 A bull foot 12 is installed on the side wall of the I-beam pile 1, the bull foot 12 is provided with a first threaded hole 13, the I-beam pile 1 is provided with a second threaded hole 14, and a third bolt 15 is passed through the first threaded hole 13 and the second threaded hole 14; and an anti-slip rod 16 is provided at one end of the bull foot 12 away from the I-beam pile 1, and the cross baffle 2 is erected above the bull foot 12 and inserted between the anti-slip rod 16 and the I-beam pile 1.

[0029] A movable cavity 21 is opened inside the cross bar plate, and a movable plate 22 is movably installed in the movable cavity 21. The movable plate 22 is slidably installed in the movable cavity 21 through a movable component 4; a plurality of through holes 23 connected to the movable cavity 21 are opened at one end of the cross baffle 2 away from the I-beam pile 1, and a support plate 24 connected to the movable plate 22 is movably arranged in the through hole 23.

[0030] Reference Figure 3The outer wall of the support column 3 is surrounded by a blocking member 5, and third threaded holes 51 are provided at both ends of the blocking member 5. The upper surface of the support plate 24 is provided with two first threaded grooves 52; when the support column 3 is installed above the support plate 24, the two third threaded holes 51 are respectively arranged opposite to the two first threaded grooves 52, and the first bolts 53 are installed in the third threaded holes 51 and the first threaded grooves 52.

[0031] Reference Figure 4 A positioning groove 25 for inserting the end of the supporting column 3 is provided on the upper surface of the supporting plate 24, and the positioning groove 25 is arranged so that the third threaded holes 51 at both ends of the blocking member 5 are arranged opposite to the two first threaded grooves 52; a tightening groove 26 is provided on the bottom wall of the positioning groove 25, and a plurality of abutting blocks 27 are movably installed in the abutting groove 26, and two adjacent abutting blocks 27 abut against each other; a first spring 28 is arranged between the abutting block 27 and the bottom wall of the abutting groove 26, and the elastic force of the first spring 28 is used to drive the abutting block 27 to move toward a side away from the abutting groove 26.

[0032] After the two ends of the support column 3 are erected above the two support plates 24, the local abutment block 27 abuts against the bottom of the support column 3 and moves toward the side away from the support plate 24; and the side wall of one of the abutment blocks 27 abuts against the end of the support column 3, which can reduce the free movement of the support column 3 between the two support plates 24; and increase the stability of the support column 3 installed above the support plate 24.

[0033] Reference Figure 2 and Figure 4 In this embodiment, the movable component 4 includes a cylinder 41 and a sliding rod 42, one end of the sliding rod 42 is rotatably connected to the inner wall of the movable chamber 21 away from the through hole 23; a sliding groove is provided on the side of the movable plate 22 away from the through hole 23, and the extension direction of the sliding groove is perpendicular to the extension direction of the cross baffle 2; a sliding seat 43 is slidably installed in the sliding groove, and the other end of the sliding rod 42 is rotatably connected to the sliding seat 43.

[0034] The outer wall of the sliding rod 42 is slidably mounted with a slider 44, the cylinder 41 is fixed above the transverse baffle 2, and the movable plug of the cylinder 41 is penetrated through the transverse baffle 2 and rotatably connected to the slider 44. By driving the movable plug of the cylinder 41, the sliding rod 42 can be rotated, so that the slide seat 43 slides in the sliding groove, so that the movable plate 22 moves closer to / away from one side of the movable cavity 21.

[0035] Reference Figure 5The support column 3 includes a plurality of connecting pipes 31 and two connecting columns 32 connected in sequence. Two adjacent connecting pipes 31 are provided with flanges 33, and the flanges 33 of the two adjacent connecting pipes 31 are connected by second bolts 34. The two connecting columns 32 are respectively installed on the sides of the two connecting pipes 31 at the head and tail ends that are away from each other, and the connecting columns 32 are connected to the connecting pipes 31 by fourth bolts 35. By configuring the support column 3 as a plurality of connecting pipes 31, the length of the support column 3 can be changed to adapt to foundation pits of different sizes, thereby improving the practicality of the structure.

[0036] The implementation principle of Example 1 of the present application is: After the I-beam, the cross baffle 2 and the support column 3 are sequentially installed in the foundation pit, the cylinder 41 on the cross baffle 2 at one end of the support column 3 is driven to move the movable plate 22 in the cross baffle 2 toward the side away from the movable cavity 21; and the position and tension of the support column 3 connected to the movable plate 22 can be adjusted at the same time, thereby adjusting the prestress of the support structure and improving the stability and bearing capacity of the device. And the structure can simultaneously adjust the support column 3 connected to the movable plate 22, thereby improving the construction efficiency.

[0037] Embodiment 2: An embodiment of the present application discloses a prestressed support structure for a foundation pit.

[0038] Reference Figure 6 The difference between Example 2 of the present application and Example 1 is that: the movable component 4 includes a motor 45, a first gear 46 and a rack 47; the rack 47 is fixed to the top wall of the movable plate 22 and abuts against the inner top wall of the movable cavity 21, and the extension direction of the rack 47 is the same as the extension direction of the movable plate 22; the first gear 46 is rotatably installed on the inner top wall of the movable cavity 21 through the rotating shaft 48 and meshes with the rack 47. By rotating the first gear 46, the rack 47 moves in meshing with the first rack 47, thereby playing a role in simultaneously adjusting the position of the support column 3.

[0039] A fixing groove 29 is provided on the upper surface of the transverse baffle 2, and one end of the rotating shaft 48 away from the first gear 46 is inserted through the transverse baffle 2 and exposed in the fixing groove 29; a second gear 49 for fixing with the rotating shaft 48 is installed in the fixing groove 29, and a mounting block 451 is installed on the output shaft of the motor 45, and the mounting block 451 is provided with a first tooth groove 452 for plugging in the second gear 49. Through the plug-in cooperation between the first tooth groove 452 and the second gear 49, the motor 45 and the transverse baffle 2 can be detachably connected; turning on the output shaft of the motor 45 can drive the second gear 49 to rotate, thereby driving the first gear 46 connected to the second gear 49 to rotate; and in the process of transporting the transverse baffle 2, the motor 45 can be removed to reduce the possibility of damage to the transverse baffle 2 during transportation.

[0040] The cross baffle 2 is provided with a fixing assembly 6, which includes a second spring 62 and a fixing ring 61. The fixing ring 61 is movably installed in the fixing groove 29, and the inner wall of the fixing ring 61 is provided with a second tooth groove 63 for being sleeved on the outer wall of the second gear 49; the two ends of the second spring 62 are respectively connected to the fixing ring 61 and the second gear 49, and the elastic force of the spring is used to drive the second tooth groove 63 of the fixing ring 61 to be sleeved on the outer wall of the second gear 49 under normal conditions, that is, to complete the fixation of the second gear 49 and the cross baffle 2, thereby reducing the free rotation of the second gear 49.

[0041] The implementation principle of Example 2 of the present application is: When the first motor 45 is connected to the baffle, the first tooth groove 452 of the mounting block 451 is sleeved on one side of the second gear 49. At this time, the mounting block 451 is in contact with the fixing ring 61, and the fixing ring 61 is moved toward the side close to the fixing groove 29 to make the second tooth groove 63 of the fixing ring 61 disengage from the plug-in with the second gear 49. At this time, the motor 45 drives the second gear 49 to rotate, thereby driving the first gear 46 to rotate in the active cavity 21 to make the active plate 22 slide in the active cavity 21, thereby playing the role of adjusting all the support columns 3 at the same time.

[0042] A prestressed support structure for a foundation pit of the present application includes the following construction steps.

[0043] S1: Use a pile driver to drive the I-beam pile 1, and make the engaging parts 11 of two adjacent I-beam piles 1 engage with each other, so that all the I-beam piles 1 are enclosed to form a rectangle of the required size on the drawing; then fix the bull foot 12 to the inner wall of the I-beam pile 1 through the third bolt 15; and set the cross baffle 2 above the bull foot 12 and insert it between the anti-drop rod 16 and the I-beam pile 1.

[0044] S2: Increase or decrease the number of connecting pipes 31 on the support column 3 according to the distance between the two opposite sides of the foundation pit, and insert the two ends of the support column 3 into the positioning grooves 25 of the two support plates 24 respectively; and then fix the support column 3 and the support plate 24 by the blocking member 5; S3: Drive the movable component 4 on the transverse baffle 2 at one end of the support column 3 to move the movable plate 22 in the transverse baffle 2 toward one end of the support column 3, thereby changing the positions of all the support columns 3 connected to the movable plate 22, and making the transverse baffles 2 at both ends of the support column 3 press against the I-beam pile 1; avoiding the problem of bending deformation caused by uneven force on the I-beam pile 1, adjusting the prestress of the support structure, and improving the stability and bearing capacity of the device.

[0045] S4: After use, the support column 3 is removed from the two cross baffles 2 through the blocking member 5, and then the cross baffle 2 is removed from between the anti-drop rod 16 and the I-beam pile 1; and the connection between the bull foot 12 and the I-beam pile 1 is cancelled through the third bolt 15, and finally the I-beam pile 1 is pulled out by the I-beam pile 1 pulling machine.

[0046] The above are preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A prestressed support structure for a foundation pit, characterized in that: The invention comprises a plurality of I-steel piles (1) installed in a foundation pit, a transverse baffle (2) installed on the side wall of the foundation pit, and a plurality of support columns (3), wherein the transverse baffle (2) is connected to the plurality of I-steel piles (1) on one side of the foundation pit; the two ends of the support columns (3) are respectively detachably connected to two transverse baffles (2); the transverse baffle (2) is provided with a movable cavity (21), a movable plate (22) is slidably installed in the movable cavity (21), the end of the support column (3) is connected to the movable plate (22), and the transverse baffle (2) is provided with a movable component (4) for driving the movable plate (22) to move in the movable cavity (21).

2. A prestressed support structure for foundation pit according to claim 1, characterized in that: The movable assembly (4) comprises a cylinder (41) and a sliding rod (42), one end of the sliding rod (42) being hinged to the inner wall of the movable chamber (21); the movable plate (22) is vertically slidably mounted with a sliding seat, the other end of the sliding rod (42) being rotatably connected to the sliding seat, and the cylinder (41) is mounted on the upper wall of the transverse baffle (2) and connected to the sliding rod (42).

3. The prestressed support structure for foundation pit according to claim 1, characterized in that: A plurality of through holes (23) communicating with the movable cavity (21) are formed on one side of the transverse baffle (2), and support plates (24) connected to the movable plate (22) are installed in all the through holes (23); the ends of the support columns (3) are mounted on the top of the support plates (24), and the outer walls of the support columns (3) are surrounded by blocking members (5), and the two ends of the blocking members (5) are connected to the support plates (24) via first bolts (53).

4. A prestressed supporting structure for foundation pit according to claim 3, characterized in that: A plurality of abutment blocks (27) for supporting the bottom of the support column (3) are movably mounted on the upper surface of the support plate (24), and two adjacent abutment blocks (27) abut against each other; a first spring (28) is provided between the abutment block (27) and the support plate (24), and the elastic force of the first spring (28) is used to drive the abutment block (27) to move toward a side away from the support plate (24); and the end of the support column (3) abuts against the side walls of the abutment blocks (27).

5. The prestressed support structure for foundation pit according to claim 1, characterized in that: The movable assembly (4) comprises a motor (45), a first gear (46) and a rack (47); the upper end of the rack (47) is fixed to the upper end of the movable plate (22); the first gear (46) is rotatably mounted on the inner wall of the movable cavity (21) and meshes with the rack (47); the motor (45) is used to drive the first gear (46) to rotate.

6. A prestressed supporting structure for foundation pit according to claim 5, characterized in that: The first gear (46) is connected via a rotating shaft (48), and a second gear (49) is mounted on an end of the rotating shaft (48) away from the first gear (46); the output shaft of the motor (45) is provided with a mounting block (451), and the mounting block (451) is provided with a first tooth groove (452) for the second gear (49) to be plugged in; and the cross baffle (2) is provided with a fixing component (6) for fixing the rotating shaft (48) and the cross baffle (2).

7. A prestressed supporting structure for foundation pit according to claim 6, characterized in that: The fixing assembly (6) comprises a second spring (62) and a fixing ring (61); a fixing groove (29) is provided on the upper surface of the transverse baffle (2); the fixing ring (61) is movably mounted in the fixing groove (29) and sleeved on the outer wall of the second gear (49); the fixing ring (61) is provided with a second tooth groove (63) for the second gear (49) to be inserted into; two ends of the second spring (62) are respectively connected to the fixing ring (61) and the bottom wall of the fixing groove (29); the elastic force of the second spring (62) is used to drive the fixing block to move toward a side away from the fixing groove (29).

8. The prestressed support structure for foundation pit according to claim 1, characterized in that: The support column (3) comprises a plurality of connecting tubes (31), and two adjacent connecting tubes (31) are connected via a second bolt (34).

9. A construction method of a prestressed foundation pit support structure according to claims 1 to 8, characterized in that: The following steps are included: S1, according to the drawings, the I-steel piles (1) are inserted into the foundation pit in sequence, so that all the I-steel piles (1) are enclosed to form a rectangle; and the cross baffle (2) is connected to all the I-steel piles (1) on one side of the foundation pit; S2, connecting the two ends of the support column (3) to the horizontal baffles (2) on opposite sides of the foundation pit respectively; S3, opening the movable assembly (4) on the transverse baffle at one end of the support column (3), driving the movable plate (22) to move in the movable cavity (21), so as to change the position of the support column (3); S4, after use, the support column (3), the cross baffle and the I-beam pile (1) are removed from the foundation pit in sequence.

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