Foundation pit support device and construction method thereof

Abstract

The present invention discloses a foundation pit support device and a construction method thereof, which relate to the technical field of foundation pit support and have the advantage of being applicable to foundation pits of different depths. The key points of its technical solution are: it includes a first side plate, a second side plate and a bottom plate arranged at the bottom of the foundation pit by screws, the first side plate and the second side plate are both vertically located at the top of the bottom plate and arranged side by side, the bottom end of the first side plate is fixedly connected to the top of the bottom plate, and the side of the first side plate facing away from the second side plate is in contact with the side wall of the foundation pit, the first side plate is provided with a moving part for moving the second side plate to directly above the first side plate, and the bottom plate is provided with a support part for obliquely supporting the first side plate and the second side plate.

Description

Technical Field

[0001] The present invention relates to the technical field of foundation pit support, in particular to a foundation pit support device and a construction method thereof. Background Art

[0002] A foundation pit is a pit excavated at the foundation's designed location, based on the base elevation and dimensions. In civil engineering, foundation pit support systems are protective measures designed to ensure the safety of underground structure construction and the surrounding environment.

[0003] At present, the Chinese patent application number CN201910239889.1 on the market discloses a deep foundation pit support structure, including side panels, a bottom plate, a support rod, a support base, a first plug-in anchor rod, a second plug-in anchor rod and a fixed anchor rod. The two support bases are respectively hinged on both sides of the support rod, and the two support bases are respectively fixedly installed on the side panels and the bottom plate. Mounting holes are provided on the side panels and the bottom plate. The first plug-in anchor rod and the second plug-in anchor rod both include a hollow body, a threaded rod, a drive disk and a plurality of plug-in plates slidably connected to the circumferential side wall of the drive disk. A sliding groove corresponding to the plug-in plate is provided on the circumferential side wall of the body. The plug-in plates are slidably plugged into the sliding grooves through the driving disk. The first plug-in anchor rod and the second plug-in anchor rod are respectively installed on the side panels and the bottom plate.

[0004] In the above-mentioned prior art, the side walls of the foundation pit are supported by side panels. However, once the depth of the foundation pit is greater than the vertical length of the side panels, the side walls of the foundation pit located above the side panels cannot be supported, resulting in a side panel that can only be used for foundation pits of one depth and cannot be used for foundation pits of different depths. Therefore, the applicant has developed a new technical solution in the actual production process to solve the above-mentioned technical problems. Summary of the Invention

[0005] The purpose of the present invention is to provide a foundation pit supporting device and a construction method thereof, which have the advantage of being applicable to foundation pits of different depths.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0007] The present invention provides a foundation pit support device, comprising a first side plate, a second side plate and a bottom plate arranged at the bottom of the foundation pit by screws, the first side plate and the second side plate are both vertically located at the top end of the bottom plate and arranged side by side, the bottom end of the first side plate is fixedly connected to the top end of the bottom plate, and the side of the first side plate facing away from the second side plate is in contact with the side wall of the foundation pit, the first side plate is provided with a moving part for moving the second side plate to directly above the first side plate, and the bottom plate is provided with a supporting part for obliquely supporting the first side plate and the second side plate.

[0008] By adopting the above technical solution, when in use, the bottom plate is installed on the bottom of the foundation pit by screws, and one side of the first side plate is in contact with the side wall of the foundation pit. At this time, the side wall of the foundation pit can be supported by the first side plate and the support member on the bottom plate for obliquely supporting the first side plate. When the depth of the foundation pit is greater than the vertical length of the first side plate, the second side plate is moved to the top of the first side plate by the moving member. At this time, one side of the second side plate is flush with one side of the first side plate and in contact with the side wall of the foundation pit. At this time, the side wall of the foundation pit can be supported by the first side plate, the second side plate and the support member on the bottom plate for obliquely supporting the first side plate and the second side plate. It is suitable for foundation pits of different depths. The support member will not affect the moving member to move the second side plate to the top of the first side plate. It is simple and convenient to use.

[0009] Preferably, the support member includes a fixed platform arranged at the top of the base plate and a support plate inclined between the top of the fixed platform and the first side plate, a vertical groove is opened on one side of the second side plate, and the bottom end of the vertical groove is connected to the bottom end of the second side plate, one end of the support plate passes through the vertical groove, and the top of the base plate is horizontally slidably connected to two opposite slides, and the two slides are respectively located on both sides of the fixed platform, the top ends of the two slides are hinged with support columns, and the ends of the two support columns away from the slides are hinged to one side of the second side plate, and the base plate is provided with a limiting member for limiting the horizontal sliding of the two slides on the base plate.

[0010] Preferably, the two support columns each include a threaded barrel and a screw, the screw is threadedly connected in the threaded barrel, the top of the slide is hinged with a turntable, the threaded barrel is rotatably connected to the top of the turntable, the screw extends from one end of the bottom of the threaded barrel to the outside of the threaded barrel and is hinged to one side of the second side plate, the limiting part includes a column and a limiting platform arranged on the bottom plate, and the limiting platform is located between the fixed platform and the second side plate, the limiting platform and the two slides are each provided with a first slot corresponding to each other, the column is horizontally arranged, and one end of the column passes horizontally through the first slots of the limiting platform and the two slides.

[0011] Preferably, two opposite ends of the plug post are threadedly connected with nuts.

[0012] Preferably, a second slot is provided on one side of the fixed platform to match the first slots on the two sliding platforms.

[0013] Preferably, the movable member includes two inverted L-shaped slides relatively arranged on the side of the first side plate close to the second side plate, and sliders are slidably connected in both slides, the second side plate is located between the two slides, and the two sliders are fixedly connected to the second side plate.

[0014] Preferably, a first closing plate matching the vertical groove is provided at the top end of the first side plate.

[0015] Preferably, the moving part includes a baffle arranged below the side of the first side plate close to the second side plate, the baffle is located between the second side plate and the first side plate, and the side of the second side plate close to the baffle is in contact with the baffle, the second side plate is hinged to the first side plate, and the hinge point of the second side plate and the first side plate is located above the second side plate and the first side plate. At this time, two opposite communicating grooves are opened on one side of the second side plate, and the two communicating grooves are connected to the bottom end of the second side plate. The groove walls on both sides of the two communicating grooves are rotatably connected with a rotating shaft, and the ends of the two screws extending outside the threaded barrel are respectively fixedly connected to the side walls of the two rotating shafts.

[0016] Preferably, when the second side plate is rotated along the hinge point between the second side plate and the first side plate to directly above the first side plate, a second closing plate is vertically inserted into the vertical groove and the two connecting grooves, and the second closing plates in the two connecting grooves are both located above the rotating shaft.

[0017] Another object of the present invention is to provide a construction method for a foundation pit support device. When in use, the bottom plate is installed on the bottom of the foundation pit by screws, and one side of the first side plate is in contact with the side wall of the foundation pit. At this time, the side wall of the foundation pit can be supported by the first side plate and the support member on the bottom plate for obliquely supporting the first side plate. When the depth of the foundation pit is greater than the vertical length of the first side plate, the second side plate is moved to the top of the first side plate by the moving member. At this time, one side of the second side plate is flush with one side of the first side plate and in contact with the side wall of the foundation pit. At this time, the side wall of the foundation pit can be supported by the first side plate, the second side plate and the support member on the bottom plate for obliquely supporting the first side plate and the second side plate. It is suitable for foundation pits of different depths, and the support member will not affect the moving member moving the second side plate to the top of the first side plate.

[0018] The beneficial effect of the present invention is that when in use, the bottom plate is installed at the bottom of the foundation pit by screws, and one side of the first side plate is in contact with the side wall of the foundation pit. At this time, the side wall of the foundation pit can be supported by the first side plate and the support member on the bottom plate for obliquely supporting the first side plate. When the depth of the foundation pit is greater than the length of the first side plate, the second side plate is moved to the top of the first side plate by the moving member. At this time, one side of the second side plate is flush with one side of the first side plate and in contact with the side wall of the foundation pit. At this time, the side wall of the foundation pit can be supported by the first side plate, the second side plate and the support member on the bottom plate for obliquely supporting the first side plate and the second side plate. It is suitable for foundation pits of different depths. The support member will not affect the moving member moving the second side plate to the top of the first side plate. It is simple and convenient to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0020] Figure 1 Schematic diagram of the structure of this embodiment;

[0021] Figure 2 This is a schematic structural diagram of the support plate of this embodiment;

[0022] Figure 3 This is a schematic diagram of the structure of the connecting groove in this embodiment;

[0023] Figure 4 FIG. 2 is a schematic structural diagram of a baffle according to the present embodiment.

[0024] Description of reference numerals:

[0025] In the figure: 1. First side panel; 2. Second side panel; 3. Screw; 5. Bottom panel; 6. Fixed platform; 7. Support plate; 8. Vertical slot; 9. Slide; 10. Support column; 12. Threaded barrel; 13. Screw; 14. Turntable; 15. Insert column; 16. Limiting platform; 17. First slot; 18. Nut; 19. Second slot; 20. Slide; 21. Slider; 22. First closing plate; 23. Baffle; 24. Connecting slot; 25. Rotating shaft; 26. Second closing plate. DETAILED DESCRIPTION

[0026] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0027] Example 1: A foundation pit support device, such as Figure 1 , including a first side panel 1, a second side panel 2 and a bottom panel 5 arranged at the bottom of the foundation pit by screws 3. The first side panel 1 and the second side panel 2 are both vertically located at the top of the bottom panel 5 and arranged side by side. The bottom end of the first side panel 1 is fixedly connected to the top of the bottom panel 5, and the side of the first side panel 1 facing away from the second side panel 2 is in contact with the side wall of the foundation pit. A moving member for moving the second side panel 2 to directly above the first side panel 1 is provided on the first side panel 1, and a supporting member for obliquely supporting the first side panel 1 and the second side panel 2 is provided on the bottom panel 5.

[0028] like Figure 1 When in use, the bottom plate 5 is installed on the bottom of the foundation pit by screws 3, and one side of the first side plate 1 is in contact with the side wall of the foundation pit. At this time, the side wall of the foundation pit can be supported by the first side plate 1 and the supporting member on the bottom plate 5 for obliquely supporting the first side plate 1. When the depth of the foundation pit is greater than the vertical length of the first side plate 1, the second side plate 2 is moved to the top of the first side plate 1 by the moving member, as shown in FIG. Figure 2 At this time, one side of the second side panel 2 is flush with one side of the first side panel 1 and contacts the side wall of the foundation pit. At this time, the side wall of the foundation pit can be supported by the first side panel 1 and the second side panel 2 and the support members on the bottom plate 5 for obliquely supporting the first side panel 1 and the second side panel 2. It is suitable for foundation pits of different depths. The support members will not affect the moving member to move the second side panel 2 to directly above the first side panel 1. It is simple and convenient to use.

[0029] like Figure 1 The support member includes a fixed platform 6 arranged at the top of the bottom plate 5 and a support plate 7 inclined between the top of the fixed platform 6 and the first side plate 1. A vertical groove 8 is opened on one side of the second side plate 2, and the bottom end of the vertical groove 8 is connected to the bottom end of the second side plate 2. One end of the support plate 7 passes through the vertical groove 8. The top of the bottom plate 5 is horizontally slidably connected to two opposite slides 9, and the two slides 9 are respectively located on both sides of the fixed platform 6. The tops of the two slides 9 are hinged with support columns 10, and the ends of the two support columns 10 away from the slides 9 are hinged to one side of the second side plate 2. A limiting member for limiting the horizontal sliding of the two slides 9 on the bottom plate 5 is provided on the bottom plate 5.

[0030] like Figure 1 , the first side wall can be obliquely supported by the support plate 7. When the moving part moves the second side plate 2 to just above the first side plate 1, the restriction of the slide 9 by the restriction part is first released, and then the moving part moves the second side plate 2 to just above the first side plate 1. During the movement of the second side plate 2, the support plate 7 will move out of the vertical groove 8. At the same time, the second side plate 2 will drive the slide 9 to slide horizontally on the bottom plate 5 through the support column 10. When the second side plate 2 moves to just above the first side plate 1, the two slides 9 are restricted by the restriction part so that they cannot slide. Figure 2 At this time, the second side plate 2 located above the first side plate 1 can be obliquely supported by the support columns 10 on the two slides 9. At this time, the side wall of the foundation pit can be supported by the cooperation of the first side plate 1 and the support plate 7 and the second side plate 2 and the two support columns 10 and the slide 9. It is simple and convenient to use.

[0031] like Figure 1, the two support columns 10 each include a threaded barrel 12 and a screw 13, the screw 13 is threadedly connected to the threaded barrel 12, the top of the slide 9 is hinged with a turntable 14, the threaded barrel 12 is rotatably connected to the top of the turntable 14, the screw 13 extends away from the end of the bottom of the threaded barrel 12 to the outside of the threaded barrel 12 and is hinged to one side of the second side plate 2, the limiting member includes a plug column 15 and a limiting platform 16 arranged on the bottom plate 5, and the limiting platform 16 is located between the fixed platform 6 and the second side plate 2, and the limiting platform 16 and the two slides 9 are provided with a first slot 17 corresponding to each other, the plug column 15 is arranged horizontally, and one end of the plug column 15 is extended from the limiting platform 1 6 passes horizontally through the first slots 17 on the two slides 9, and the opposite ends of the plug post 15 are threadedly connected with nuts 18. The purpose of this setting is that when the first slots 17 on the two slides 9 are aligned with the first slots 17 on the limiting platform 16, this is the initial position of the two slides 9. The plug post 15, one end of which passes horizontally through the limiting platform 16 and the first slots 17 on the two slides 9, can restrict the slide 9 and prevent it from sliding horizontally on the base plate 5. By unscrewing the nut 18 and then pulling the plug post 15 out of the first slot 17, the restriction on the slide 9 can be released and it can no longer slide.

[0032] When the second side plate 2 is moved to the top of the first side plate 1, the screw 13 is gradually screwed out of the screw barrel 12 by rotating the threaded barrel 12. At this time, one side of the second side plate 2 is always in contact with the side wall of the foundation pit, and the threaded barrel 12 pushes the slide 9 to slide away from the first side plate 1 until the two slides 9 move back to their initial positions. Figure 2 Then, pass one end of the plug 15 horizontally through the first slot 17 on the limiting platform 16 and the two slides 9, and then screw the two nuts 18 on the two ends of the plug 15 respectively, and make the two nuts 18 contact the two slides 9 respectively. It is simple and convenient to use.

[0033] like Figure 2 , a second slot 19 is provided on one side of the fixed table 6 to match the first slots 17 on the two slides 9. The purpose of this setting is that when it is necessary to adjust the oblique support angle of the support column 10 to the second side panel 2, the slide 9 is moved to the initial position by rotating the threaded barrel 12, and then the threaded barrel 12 is continued to be rotated to make the slide 9 pass from the initial position until the first slots 17 on the two slides 9 are aligned with the second slots 19 on the fixed table 6, and then one end of the column 15 is horizontally passed through the first slot 17 on one of the slides 9, the second slot 19 on the fixed table 6, and the first slot 17 on the other slide 9 in turn, and then the two nuts 18 are respectively screwed on the two ends of the column 15. At this time, the oblique support angle of the support column 10 to the second side panel 2 can be adjusted, which is simple and convenient to use.

[0034] like Figure 1The moving part includes two inverted L-shaped slides 20 relatively arranged on one side of the first side plate 1 close to the second side plate 2, and a slider 21 is slidably connected in the two slides 20. The second side plate 2 is located between the two slides 20, and the two sliders 21 are fixedly connected to the second side plate 2. The purpose of this arrangement is that when the second side plate 2 needs to be moved to the top of the first side plate 1, it is only necessary to pull the second side plate 2 to drive the slider 21 to move upward in the slide 20. When the second side plate 2 moves to the top of one side of the first side plate 1, the second side plate 2 is pulled horizontally in the direction close to the first side plate 1 until the second side plate 2 moves to the top of the first side plate 1 (such as Figure 2 ), easy and convenient to use.

[0035] like Figure 1 , the top of the first side panel 1 is provided with a first closing plate 22 that matches the vertical groove 8. The purpose of this setting is that when the second side panel 2 moves to the top of one side of the first side panel 1, the second side panel 2 is pulled to move horizontally in the direction close to the first side panel 1, and the second closing plate 26 is aligned with the vertical groove 8 and embedded. When the second side panel 2 moves to the top of the first side panel 1, the second closing plate 26 is completely located in the vertical groove 8. At this time, the second closing plate 26 will close the vertical groove 8 (such as Figure 2 ), at this time, the occurrence of soil on the side wall of the foundation pit falling from the vertical groove 8 can be reduced, and the use is simple and convenient.

[0036] like Figure 3 Alternatively, the moving part includes a baffle 23 arranged below the side of the first side plate 1 close to the second side plate 2, the baffle 23 is located between the second side plate 2 and the first side plate 1, and the side of the second side plate 2 close to the baffle 23 is in contact with the baffle 23, the second side plate 2 is hinged to the first side plate 1, and the hinge point of the second side plate 2 and the first side plate 1 is located above the second side plate 2 and the first side plate 1. At this time, two opposite communicating grooves 24 are opened on one side of the second side plate 2, and the two communicating grooves 24 are connected to the bottom end of the second side plate 2, and the groove walls on both sides of the two communicating grooves 24 are rotatably connected with a rotating shaft 25, and the two screws 13 extend to the end outside the threaded barrel 12 and are fixedly connected to the side walls of the two rotating shafts 25 respectively.

[0037] like Figure 3 When the second side plate 2 is located on one side of the first side plate 1, since the second side plate 2 is in contact with the baffle 23, the first side plate 1 can be further obliquely supported by the second side plate 2 and the supporting member that obliquely supports the second side plate 2;

[0038] When the second side panel 2 needs to be moved to the top of the first side panel 1, it is only necessary to push the second side panel 2 upward along the hinge point between the second side panel 2 and the first side panel 1 until the second side panel 2 is rotated to the top of the first side panel 1 (as shown in FIG. Figure 4), when the second side plate 2 is rotated to the top of the first side plate 1, the support column 10 formed by the screw 13 and the threaded barrel 12 will pass through the connecting groove 24, which is simple and convenient to use.

[0039] like Figure 4 When the second side panel 2 is rotated along the hinge point between the second side panel 2 and the first side panel 1 to the top of the first side panel 1, a second closing plate 26 is vertically inserted into the vertical groove 8 and the two communicating grooves 24, and the second closing plates 26 in the two communicating grooves 24 are both located above the rotating shaft 25. The purpose of this arrangement is that when the second side panel 2 is rotated along the hinge point between the second side panel 2 and the first side panel 1 to the top of the first side panel 1, the second closing plate 26 is vertically inserted into the vertical groove 8 and the two communicating grooves 24. At this time, the vertical groove 8 can be closed by the second closing plate 26 in the vertical groove 8, and the communicating groove 24 can be partially closed by the second closing plate 26 in the communicating groove 24. At this time, the soil on the side wall of the foundation pit can be reduced from falling from the vertical groove 8 and the communicating groove 24, which is simple and convenient to use.

[0040] Example 2: A construction method of a foundation pit support device, including Example 1. When in use, the bottom plate 5 is installed on the bottom of the foundation pit by screws 3, and one side of the first side plate 1 is in contact with the side wall of the foundation pit. At this time, the side wall of the foundation pit can be supported by the first side plate 1 and the support member on the bottom plate 5 for obliquely supporting the first side plate 1. When the depth of the foundation pit is greater than the vertical length of the first side plate 1, the second side plate 2 is moved to the top of the first side plate 1 by the moving member. At this time, one side of the second side plate 2 is flush with one side of the first side plate 1 and in contact with the side wall of the foundation pit. At this time, the side wall of the foundation pit can be supported by the first side plate 1 and the second side plate 2 and the support member on the bottom plate 5 for obliquely supporting the first side plate 1 and the second side plate 2. It is suitable for foundation pits of different depths, and the support member will not affect the moving member moving the second side plate 2 to the top of the first side plate 1.

[0041] Obviously, those skilled in the art may make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if such changes and modifications fall within the scope of the claims and their equivalents, the present invention is intended to include such changes and modifications.

Claims

1. A foundation pit support device, characterized in that: The invention comprises a first side plate (1), a second side plate (2) and a bottom plate (5) arranged at the bottom of a foundation pit by screws (3), wherein the first side plate (1) and the second side plate (2) are both vertically located at the top of the bottom plate (5) and arranged side by side, the bottom end of the first side plate (1) is fixedly connected to the top of the bottom plate (5), and the side of the first side plate (1) facing away from the second side plate (2) contacts the side wall of the foundation pit, the first side plate (1) is provided with a moving member for moving the second side plate (2) to directly above the first side plate (1), and the bottom plate (5) is provided with a supporting member for obliquely supporting the first side plate (1) and the second side plate (2); The support member comprises a fixed platform (6) arranged at the top of the bottom plate (5) and a support plate (7) obliquely arranged between the top of the fixed platform (6) and the first side plate (1); a vertical groove (8) is provided on one side of the second side plate (2), and the bottom end of the vertical groove (8) is connected to the bottom end of the second side plate (2); one end of the support plate (7) passes through the vertical groove (8); the top of the bottom plate (5) is horizontally slidably connected to two opposite slides (9), and the two slides (9) are respectively located on both sides of the fixed platform (6); the top ends of the two slides (9) are hinged with support columns (10); The two support columns (10) each include a threaded barrel (12) and a screw (13), wherein the screw (13) is threadedly connected to the threaded barrel (12), a turntable (14) is hingedly connected to the top of the slide (9), and the threaded barrel (12) is rotatably connected to the top of the turntable (14), and an end of the screw (13) away from the bottom of the threaded barrel (12) extends outside the threaded barrel (12) and is hingedly connected to one side of the second side plate (2); The movable member comprises a baffle (23) arranged below a side of the first side plate (1) close to the second side plate (2), the baffle (23) being located between the second side plate (2) and the first side plate (1), and the side of the second side plate (2) close to the baffle (23) being in contact with the baffle (23), the second side plate (2) being hinged to the first side plate (1), and the hinge point of the second side plate (2) and the first side plate (1) being located above the second side plate (2) and the first side plate (1), at which point two opposite communicating grooves (24) are provided on one side of the second side plate (2), and both communicating grooves (24) are connected to the bottom end of the second side plate (2), and a rotating shaft (25) is rotatably connected between the groove walls on opposite sides of the two communicating grooves (24), and one end of the two screw rods (13) extending outside the threaded barrel (12) is fixedly connected to the side walls of the two rotating shafts (25) respectively.

2. A foundation pit supporting device according to claim 1, characterized in that: The ends of the two support columns (10) away from the slide (9) are both hinged to one side of the second side plate (2), and the bottom plate (5) is provided with a limiting member for limiting the horizontal sliding of the two slides (9) on the bottom plate (5).

3. A foundation pit supporting device according to claim 2, characterized in that: The limiting member includes a plug post (15) and a limiting platform (16) arranged on the bottom plate (5), and the limiting platform (16) is located between the fixed platform (6) and the second side plate (2), and the limiting platform (16) and the two slides (9) are each provided with a first slot (17) corresponding to each other, and the plug post (15) is arranged horizontally, and one end of the plug post (15) passes horizontally through the first slots (17) on the limiting platform (16) and the two slides (9).

4. A foundation pit supporting device according to claim 3, characterized in that: Nuts (18) are threadedly connected to opposite ends of the plug post (15).

5. The foundation pit supporting device according to claim 3, characterized in that: A second slot (19) is provided on one side of the fixed platform (6) to match the first slots (17) on the two slide platforms (9).

6. The foundation pit supporting device according to claim 1, characterized in that: When the second side plate (2) is rotated along the hinge point between the second side plate (2) and the first side plate (1) to directly above the first side plate (1), the second closing plate (26) is vertically inserted into the vertical groove (8) and the two connecting grooves (24), and the second closing plates (26) in the two connecting grooves (24) are both located above the rotating shaft (25).

7. A construction method for a foundation pit support device according to any one of claims 1 to 6, characterized in that: When in use, the bottom plate (5) is installed on the bottom of the foundation pit by means of screws (3), and one side of the first side plate (1) is in contact with the side wall of the foundation pit. At this time, the side wall of the foundation pit can be supported by the first side plate (1) and the support member on the bottom plate (5) for obliquely supporting the first side plate (1). When the depth of the foundation pit is greater than the vertical length of the first side plate (1), the second side plate (2) is moved to the top of the first side plate (1) by the moving member. At this time, one side of the second side plate (2) is flush with one side of the first side plate (1) and in contact with the side wall of the foundation pit. At this time, the side wall of the foundation pit can be supported by the first side plate (1) and the second side plate (2) and the support member on the bottom plate (5) for obliquely supporting the first side plate (1) and the second side plate (2). It is suitable for foundation pits of different depths, and the support member will not affect the moving member moving the second side plate (2) to the top of the first side plate (1).

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