Fabricated I-shaped steel support quick connection joint structure and method for foundation pit supporting

Abstract

The invention discloses a fabricated I-shaped steel support quick connection joint structure for foundation pit supporting. The fabricated I-shaped steel support quick connection joint structure comprises a first U-shaped steel plate and a second U-shaped steel plate which are connected through a plurality of steel pipe connection assemblies. The steel pipe connecting assembly comprises a first steel pipe, a protective steel pipe and a second steel pipe, inserting blocks are arranged at the outer ends of the first steel pipe and the second steel pipe correspondingly, inserting assemblies are arranged on the two inserting blocks correspondingly, an extending assembly is arranged in the first steel pipe, the protective steel pipe and the second steel pipe jointly, and a limiting assembly connected with the extending assembly is arranged at the top of the first steel pipe; the extending assembly comprises a first gear movably arranged in the first steel pipe, the outer surface of the first gear is meshed with a second gear, the left side face of the second gear is provided with a rotating rod, the left end face of the rotating rod is provided with a rotating disc, the left side face of the rotating disc is provided with a threaded rotating rod, the outer surface of the threaded rotating rod is in threaded connection with a threaded cylinder, and the end of the threaded cylinder is connected with the inner side end of the second steel pipe. The supporting frame has the advantages that the distance between the supporting frames can be adjusted according to the width of a foundation pit when the I-shaped steel is conveniently mounted and dismounted, and the like.

Description

Technical Field

[0001] The present application belongs to the technical field of foundation pit support, and specifically relates to a prefabricated I-beam support quick connection node structure and method for foundation pit support. Background Art

[0002] The foundation pit is an earth pit formed by excavating at the foundation design location according to the base elevation and foundation plane dimensions. Before excavating the foundation pit, a scientific and reasonable excavation plan must be formulated based on geological and hydrological data and the actual conditions of nearby buildings on site, while also ensuring waterproofing and drainage. When the excavation depth is shallow, the side slope can be used to ensure the stability of the soil slope, and the slope must be determined in accordance with relevant construction project regulations. If the excavation is deep and there are buildings nearby, the foundation pit wall support and sprayed concrete wall protection methods can be used. For large foundation pits, underground continuous walls and column-type bored pile chains may even be used to prevent the outer soil layer from collapsing. There are many types of foundation pits, and the I-beam steel foundation pit is one of them.

[0003] As an economical and efficient profile, I-beams offer an optimized cross-sectional area distribution and a more reasonable strength-to-weight ratio. Named after its cross-section resembling the English letter "H," H-beams, with their various components arranged at right angles, offer significant advantages such as strong bending resistance in all directions, simple construction, cost savings, and lightweight structures.

[0004] The invention patent with Chinese patent application number 202410948380.5 discloses a foundation pit support device and support method with H-shaped steel advance diagonal braces anchored into the soil. During use, this device and method can solve the problem that traditional foundation pit support devices are inconvenient to disassemble, resulting in the entire device being heavy to install, difficult to carry, and unable to be recycled and reused. However, this device and method still have some shortcomings in actual application: First, it is fixed by inserting a rod into the interior of the foundation pit, but the interior of the foundation pit at the construction site is usually relatively humid. This environment can easily cause the rod to deviate, thereby affecting the support and protection effect of the side walls of the foundation pit; second, although the foundation pit support device achieves the purpose of convenient disassembly through a simple connection structure, it performs poorly in terms of stability; third, it cannot adjust the support distance on both sides of the foundation pit according to the width of the foundation pit. Therefore, it is necessary to propose a new device or method for foundation pit support to solve the above problems. Summary of the Invention

[0005] The present application provides a prefabricated I-beam support quick connection node structure and method for foundation pit support, which has the advantages of convenient installation and disassembly of the I-beam and the ability to adjust the spacing between support frames according to the width of the foundation pit.

[0006] In order to achieve the above application objectives, this application provides the following technical solutions:

[0007] The present application provides an assembled I-steel support quick connection node structure for foundation pit support, which comprises a first U-shaped steel plate and a second U-shaped steel plate with openings arranged opposite to each other and connected by a plurality of steel pipe connection assemblies;

[0008] The steel pipe connection assembly includes a first steel pipe, a protective steel pipe fixed to the left end face of the first steel pipe, and a second steel pipe movably sleeved on the outside of the left end of the protective steel pipe. The first steel pipe and the second steel pipe are respectively provided with a plug-in block on the end faces facing away from each other. The two plug-in blocks are respectively provided with a plug-in assembly connected to the first U-shaped steel plate or the second U-shaped steel plate. The first steel pipe, the protective steel pipe, and the second steel pipe are all movably provided with an extension assembly. The top of the first steel pipe is provided with a limit assembly connected to the extension assembly.

[0009] The extension assembly includes a first gear movably mounted inside the first steel pipe, a second gear is meshedly connected to the outer surface of the first gear, a rotating rod is provided on the left side of the second gear, a rotating disk is provided on the left end face of the rotating rod, a threaded rotating rod is provided on the left side of the rotating disk, a threaded barrel is threadedly connected to the outer surface of the threaded rotating rod, and the end of the threaded barrel is connected to the inner end of the second steel pipe.

[0010] Furthermore, the limiting assembly includes a rotating shaft movably mounted on the top of the first steel pipe, a rotating wheel is provided on the top of the rotating shaft, and the bottom is connected to the first gear. A protective ring is fixedly mounted on the top of the first steel pipe, and the external thread of the protective ring is connected to a limiting bolt. A positioning hole corresponding to the limiting bolt is opened on the outside of the rotating shaft, and the limiting bolt is inserted into the positioning hole.

[0011] Furthermore, the plug-in assembly includes plug-in columns symmetrically arranged at the top and bottom of the plug-in block, each of the plug-in columns is vertically provided with a limited sliding groove on the outside, a positioning block is movably sleeved on the outside of the plug-in column, the inner side of the positioning block is limitedly slidably connected to the limited sliding groove, and a sliding block is provided on one side of the positioning block;

[0012] A plurality of pairs of fixing blocks corresponding to each of the steel pipe connection components are provided corresponding to the inner sides of the openings of the first U-shaped steel plate and the second U-shaped steel plate, and each of the fixing blocks is provided with a transverse limiting groove and a vertical limiting groove that are interconnected and perpendicular to each other, the transverse limiting groove is provided in the middle of the fixing block, and there are two vertical limiting grooves, which are provided on the upper and lower sides of the transverse limiting groove respectively, the vertical limiting groove is adapted to the sliding block, and a limiting block is provided at the other end of the vertical limiting groove, and a groove adapted to the positioning block is provided on the limiting block;

[0013] When the plug-in assembly is connected to the first U-shaped steel plate or the second U-shaped steel plate, each plug-in block is located in the horizontal limit groove of the corresponding fixed block, each sliding block is located in the corresponding vertical limit groove, and each positioning block is inserted in the groove of the corresponding limit block.

[0014] Furthermore, a plug-in plate is vertically provided at the outer end of each plug-in block, and a plurality of mounting holes are correspondingly opened between each plug-in plate and the first U-shaped steel plate or the second U-shaped steel plate and are connected by positioning bolts.

[0015] Furthermore, U-shaped grooves perpendicular to their respective openings are respectively formed on the outer side surfaces of the first U-shaped steel plate and the second U-shaped steel plate.

[0016] The construction method of the assembled I-beam support quick connection node structure for foundation pit support described in the above technical solution has the following steps:

[0017] S1. First, level the support pit and place the steel parts inside the support pit for assembly;

[0018] S2. Inserting the first steel pipe and the second steel pipe of each steel pipe connecting assembly into the interior of the first U-shaped steel plate and the second U-shaped steel plate respectively through the plug-in assembly;

[0019] S3, placing the foundation pit support plate in the first U-shaped steel plate, the second U-shaped steel plate and the U-shaped groove and aligning it with the corresponding supporting foundation pit arm;

[0020] S4. Adjust the distance between the first U-shaped steel plate and the second U-shaped steel plate and the fit with the foundation pit wall through the extension component, and finally limit the extension component through the limiting component so that the first U-shaped steel plate and the second U-shaped steel plate are stably positioned at the foundation pit wall and supported.

[0021] Compared with the existing technology, the fabricated I-beam support quick connection node structure and method for foundation pit support in this application have the following advantages:

[0022] (1) The prefabricated I-beam support quick connection node structure and construction method for foundation pit support is provided with an extension component. When it is needed to adjust the distance between the first U-shaped steel plate and the second U-shaped steel plate, the wheel is rotated. The wheel drives the first gear and the second gear to engage and rotate with each other through the rotating shaft, thereby driving the rotating rod, the turntable and the threaded rotating rod to rotate synchronously. The threaded rotating rod and the threaded barrel provided inside the second steel pipe are threadedly connected to each other, so that the threaded rotating rod further pushes the first steel pipe and the protective steel pipe to move to the left or right, thereby adjusting the distance between the first U-shaped steel plate and the second U-shaped steel plate, realizing support adjustment according to the spacing distance of the support foundation pit, and improving the support range of the support foundation pit.

[0023] (2) The prefabricated I-beam support quick connection node structure and construction method for foundation pit support is provided with a plug-in assembly. When in use, the plug-in block and the plug-in column are plugged into the inside of the transverse limit groove. At this time, the sliding block slides on the surface position of the fixed block. By moving the sliding block, the positioning block is driven to move on the outer surface of the plug-in column, so that the sliding block slides from the transverse limit groove to the inside of the vertical limit groove, and further drives the positioning block to move to the position where the limit blocks are mutually adapted, so that the groove of the limit block is engaged with the positioning block and limited. Finally, the first steel pipe and the second steel pipe are connected to the side positions of the first U-shaped steel plate and the second U-shaped steel plate respectively, which facilitates the assembly, connection and installation of the I-beam and improves the assembly efficiency of the I-beam frame.

[0024] (3) The prefabricated I-beam support quick connection node structure and construction method for foundation pit support is provided with a limit assembly. When in use, the rotation shaft is driven by the turntable to adjust the extension assembly. When in use, the two sides between the first U-shaped steel plate and the second U-shaped steel plate are pressed by the side walls, causing the gears to rotate. By rotating the limit bolts into the inside of the positioning hole, the rotation shaft and the turntable are limited, avoiding the contraction of the extension assembly to affect the support effect of the first steel pipe, the protective steel pipe and the second steel pipe on the foundation pit, thereby improving the stability of the foundation pit support. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a three-dimensional schematic diagram of an assembled I-beam support quick connection node structure for foundation pit support according to the present invention;

[0026] Figure 2 This is a three-dimensional schematic diagram of the connection between the first steel pipe, the protective steel pipe and the second steel pipe in the present invention;

[0027] Figure 3 This is a front cross-sectional view of the connection between the first steel pipe, the protective steel pipe and the second steel pipe in the present invention;

[0028] Figure 4 For the present invention Figure 2 A magnified view of the structure at center A;

[0029] Figure 5 This is a schematic diagram of the plug-in assembly of the present invention when locked;

[0030] Figure 6 Schematic diagram of the U-shaped groove of the first U-shaped steel plate in the present invention.

[0031] In the figure: 1. first steel pipe; 2. protective steel pipe; 3. second steel pipe; 4. first U-shaped steel plate; 5. second U-shaped steel plate; 6. U-shaped groove; 7. positioning bolt; 8. fixing block; 9. horizontal limiting groove; 10. vertical limiting groove; 12. limiting assembly; 121. rotating wheel; 122. rotating shaft; 123. protective ring; 124. limiting bolt; 125. positioning hole; 13. plug-in plate; 14. mounting hole; 15. plug-in block; 16. extension assembly; 161. first gear; 162. second gear; 163. rotating rod; 164. turntable; 165. threaded rotating rod; 166. threaded barrel; 17. plug-in assembly; 171. plug-in column; 172. limiting slide groove; 173. positioning block; 174. sliding block; 175. limiting block. DETAILED DESCRIPTION

[0032] The following will clearly and completely describe the technical solutions in the embodiments of the present application in conjunction with the drawings in the embodiments of the present application. Obviously, the embodiments described are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application. Unless otherwise defined, the technical terms or scientific terms used herein should have the common meanings understood by people with ordinary skills in the field to which this disclosure belongs. The terms "upper", "lower", "left", "right", "front", "back", etc. used in the patent application specification and claims of this disclosure are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship also changes accordingly. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Anything not described in detail in this application is well known to those skilled in the art.

[0033] Please refer to Figure 1-6 The present application provides an assembled I-beam support quick connection node structure for foundation pit support, which includes a first U-shaped steel plate 4 and a second U-shaped steel plate 5 with openings arranged opposite to each other and connected by multiple steel pipe connection components.

[0034] The steel pipe connection assembly includes a first steel pipe 1, a protective steel pipe 2 fixed to the left end face of the first steel pipe 1, and a second steel pipe 3 movably sleeved on the outside of the left end of the protective steel pipe 2. The first steel pipe 1 and the second steel pipe 3 are respectively provided with plug-in blocks 15 on the end faces facing away from each other. The two plug-in blocks 15 are respectively provided with plug-in assemblies 17 connected to the first U-shaped steel plate 4 or the second U-shaped steel plate 5. An extension assembly 16 is movably provided inside the first steel pipe 1, the protective steel pipe 2 and the second steel pipe 3. A limiting assembly 12 connected to the extension assembly 16 is provided on the top of the first steel pipe 1.

[0035] The extension assembly 16 includes a first gear 161 movably mounted inside the first steel pipe 1, and a second gear 162 is meshedly connected to the outer surface of the first gear 161. A rotating rod 163 is provided on the left side of the second gear 162, and a turntable 164 is provided on the left end surface of the rotating rod 163. A threaded rotating rod 165 is provided on the left side of the turntable 164. A threaded barrel 166 is threadedly connected to the outer surface of the threaded rotating rod 165, and the end of the threaded barrel 166 is connected to the inner end of the second steel pipe 3.

[0036] Specifically, the limiting assembly 12 includes a rotating shaft 122 movably mounted on the top of the first steel pipe 1, a rotating wheel 121 is provided on the top of the rotating shaft 122, and the bottom is connected to the first gear 161, and a protective ring 123 is fixedly installed on the top of the first steel pipe 1, and the external thread of the protective ring 123 is connected to the limiting bolt 124, and a positioning hole 125 corresponding to the limiting bolt 124 is opened on the outside of the rotating shaft 122, and the limiting bolt 124 is inserted into the positioning hole 125. When the spacing between the first U-shaped steel plate 4 and the second U-shaped steel plate 5 needs to be adjusted, the wheel 121 is rotated, and the wheel 121 drives the first gear 161 and the second gear 162 to engage with each other through the shaft 122, thereby driving the second gear 162, the rotating rod 163, the rotating disk 164 and the threaded rotating rod 165 to rotate synchronously. The threaded rotating rod 165 is threadedly connected to the threaded barrel 166 provided inside the second steel pipe 3, so that the threaded rotating rod 165 further pushes the first steel pipe 1 and the protective steel pipe 2 to move left or right, thereby adjusting the distance between the two U-shaped steel plates, realizing support adjustment according to the spacing distance of the support pit, and improving the support range of the support pit. The limit bolt 124 is used to limit the rotating shaft 122.

[0037] In this embodiment, the plug-in assembly 17 includes plug-in columns 171 symmetrically arranged at the top and bottom of the plug-in block 15. A limiting groove 172 is vertically provided on the outside of each plug-in column 171. A positioning block 173 is movably sleeved on the outside of the plug-in column 171. The inner side of the positioning block 173 is slidingly connected to the limiting groove 172, and a sliding block 174 is provided on one side of the positioning block 173.

[0038] Corresponding to the inner side of the openings of the first U-shaped steel plate 4 and the second U-shaped steel plate 5, there are multiple pairs of fixed blocks 8 corresponding to each steel pipe connection component. Each fixed block 8 is provided with a transverse limit groove 9 and a vertical limit groove 10 that are interconnected and perpendicular to each other. The transverse limit groove 9 is opened in the middle of the fixed block 8. There are two vertical limit grooves 10, which are correspondingly arranged on the upper and lower sides of the transverse limit groove 9. The vertical limit groove 10 is adapted to the sliding block 174. A limit block 175 is provided at the other end of the vertical limit groove 10. The limit block 175 is provided with a groove adapted to the positioning block 173.

[0039] When the plug-in assembly 17 is connected to the first U-shaped steel plate 4 or the second U-shaped steel plate 5, each plug-in block 15 is located in the horizontal limit groove 9 of the corresponding fixed block 8, each sliding block 174 is located in the corresponding vertical limit groove 10, and each positioning block 173 is inserted into the groove of the corresponding limit block 175.

[0040] In order to further increase the stability of the node structure, a plug-in plate 13 is vertically arranged at the outer end of each plug-in block 15, and a plurality of mounting holes 14 are correspondingly opened between each plug-in plate 13 and the first U-shaped steel plate 4 or the second U-shaped steel plate 5 and are connected by positioning bolts 7.

[0041] In order to facilitate the positioning and connection between the node structure and the foundation pit support, U-shaped grooves 6 perpendicular to their respective openings are respectively opened on the outer side surfaces of the first U-shaped steel plate 4 and the second U-shaped steel plate 5.

[0042] When applied, the construction method of the assembled I-beam support quick connection node structure for foundation pit support is as follows:

[0043] S1. First, level the support pit and place the steel parts inside the support pit for assembly;

[0044] S2. Insert the first steel pipe 1 and the second steel pipe 3 of each steel pipe connection assembly into the first U-shaped steel plate 4 and the second U-shaped steel plate 5 respectively through the plug-in assembly 17;

[0045] S3, placing the foundation pit support plate in the first U-shaped steel plate 4, the second U-shaped steel plate 5 and the U-shaped groove 6 and aligning it with the corresponding supporting foundation pit arm;

[0046] S4. Adjust the distance between the first U-shaped steel plate 4 and the second U-shaped steel plate 5 and the fit with the foundation pit wall through the extension component 16, and finally limit the extension component 16 through the limiting component 12, so that the first U-shaped steel plate 4 and the second U-shaped steel plate 5 are stably positioned at the foundation pit wall and supported.

[0047] In this embodiment, the plug-in connection is performed with the first U-shaped steel plate 4 and the second U-shaped steel plate 5 through the plug-in assembly 17. The plug-in block 15 is fixed to the ends of the first steel pipe 1 and the second steel pipe 3 and inserted into the fixed block 8 inside the first U-shaped steel plate 4 and the second U-shaped steel plate 5; the fixed block 8 is located on the inner side wall of the U-shaped steel plate and is perpendicular to the contact surface of the foundation pit support plate; during the initial insertion, the plug-in block 15 together with the plug-in column 171 is inserted into the horizontal limit groove 9 of the fixed block 8 in the horizontal direction. At this time, the sliding block 174 is located in the horizontal limit groove 9 and can be horizontally inserted. Slides but is not locked; manual locking is required after the connection is completed, specifically by manually pushing the sliding block 174, driving the positioning block 173 to move up and down along the limiting slide groove 172 of the plug column 171, so that the sliding block 174 slides from the horizontal limiting groove 9 into the vertical limiting groove 10; a limiting block 175 is provided at the end of the vertical limiting groove 10, and the positioning block 173 is snapped into the groove of the limiting block 175 to complete the mechanical interlocking, and finally the positioning bolt 7 is passed through the U-shaped groove 6 and the mounting hole 14 of the plug board 12 again to complete the connection, thereby enhancing the shear resistance.

Claims

1. A prefabricated I-steel support quick connection node structure for foundation pit support, characterized in that: It comprises a first U-shaped steel plate (4) and a second U-shaped steel plate (5) with openings arranged opposite to each other and connected via a plurality of steel pipe connection assemblies; The steel pipe connection assembly comprises a first steel pipe (1), a protective steel pipe (2) fixed to the left end face of the first steel pipe (1), and a second steel pipe (3) movably sleeved on the outer side of the left end of the protective steel pipe (2); the first steel pipe (1) and the second steel pipe (3) are respectively provided with a plug-in block (15) on the end faces facing away from each other; the two plug-in blocks (15) are respectively provided with a plug-in assembly (17) connected to the first U-shaped steel plate (4) or the second U-shaped steel plate (5); the first steel pipe (1), the protective steel pipe (2), and the second steel pipe (3) are movably provided with an extension assembly (16); and the top of the first steel pipe (1) is provided with a limit assembly (12) connected to the extension assembly (16); The extension assembly (16) includes a first gear (161) movably mounted inside the first steel pipe (1), a second gear (162) is meshedly connected to the outer surface of the first gear (161), a rotating rod (163) is provided on the left side of the second gear (162), a rotating disk (164) is provided on the left end face of the rotating rod (163), a threaded rotating rod (165) is provided on the left side of the rotating disk (164), a threaded barrel (166) is threadedly connected to the outer surface of the threaded rotating rod (165), and an end of the threaded barrel (166) is connected to the inner end of the second steel pipe (3).

2. The assembled I-beam quick-connect node structure for foundation pit support according to claim 1, characterized in that: The limiting assembly (12) includes a rotating shaft (122) movably mounted on the top of the first steel pipe (1), a rotating wheel (121) is provided on the top of the rotating shaft (122), and the bottom is connected to the first gear (161), a protective ring (123) is fixedly mounted on the top of the first steel pipe (1), and the protective ring (123) is externally threadedly connected to a limiting bolt (124), and a positioning hole (125) corresponding to the limiting bolt (124) is opened on the outside of the rotating shaft (122), and the limiting bolt (124) is inserted into the positioning hole (125).

3. The assembled I-beam quick-connect node structure for foundation pit support according to claim 1, characterized in that: The plug-in assembly (17) includes plug-in columns (171) symmetrically arranged at the top and bottom of the plug-in block (15), each plug-in column (171) is provided with a limiting sliding groove (172) vertically on the outside, and a positioning block (173) is movably sleeved on the outside of the plug-in column (171), the inner side of the positioning block (173) is connected to the limiting sliding groove (172) in a limiting sliding manner, and a sliding block (174) is provided on one side of the positioning block (173); A plurality of pairs of fixed blocks (8) corresponding to each of the steel pipe connection assemblies are provided on the inner sides of the openings of the first U-shaped steel plate (4) and the second U-shaped steel plate (5), and each of the fixed blocks (8) is provided with a transverse limiting groove (9) and a vertical limiting groove (10) that are interconnected and perpendicular to each other. The transverse limiting groove (9) is provided in the middle of the fixed block (8), and there are two vertical limiting grooves (10), which are provided on the upper and lower sides of the transverse limiting groove (9) in correspondence. The vertical limiting groove (10) is adapted to the sliding block (174), and a limiting block (175) is provided at the other end of the vertical limiting groove (10), and a groove adapted to the positioning block (173) is provided on the limiting block (175); When the plug-in assembly (17) is connected to the first U-shaped steel plate (4) or the second U-shaped steel plate (5), each plug-in block (15) is located in the horizontal limiting groove (9) of each corresponding fixed block (8), each sliding block (174) is located in the corresponding vertical limiting groove (10), and each positioning block (173) is plugged into the groove of each corresponding limiting block (175).

4. The assembled I-beam quick-connect node structure for foundation pit support according to claim 3, characterized in that: A plug-in plate (13) is vertically provided at the outer end of each plug-in block (15), and a plurality of mounting holes (14) are correspondingly provided between each plug-in plate (13) and the first U-shaped steel plate (4) or the second U-shaped steel plate (5) and are connected via positioning bolts (7).

5. The assembled I-beam quick-connect node structure for foundation pit support according to claim 1, characterized in that: The first U-shaped steel plate (4) and the second U-shaped steel plate (5) are respectively provided with U-shaped grooves (6) perpendicular to their respective openings on their outer sides.

6. A construction method for a prefabricated I-beam support quick connection node structure for foundation pit support according to any one of claims 1 to 5, characterized in that: Here are the steps: S1. First, level the support pit and place the steel parts inside the support pit for assembly; S2, inserting the first steel pipe (1) and the second steel pipe (3) of each of the steel pipe connection assemblies into the interior of the first U-shaped steel plate (4) and the second U-shaped steel plate (5) respectively through the plug-in assembly (17); S3, placing the foundation pit support plate in the first U-shaped steel plate (4), the second U-shaped steel plate (5) and the U-shaped groove (6) and aligning them with the corresponding supporting foundation pit arms; S4, adjusting the spacing between the first U-shaped steel plate (4) and the second U-shaped steel plate (5) and the degree of fit with the foundation pit wall through the extension component (16), and finally limiting the extension component (16) through the limiting component (12), so that the first U-shaped steel plate (4) and the second U-shaped steel plate (5) are stably positioned at the foundation pit wall and supported.

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