Combined deep foundation pit supporting structure and construction method

Abstract

The invention discloses a combined type deep foundation pit supporting structure and a construction method. The combined type deep foundation pit supporting structure comprises a supporting plate, a fixing cylinder, a fixing inserting rod and a limiting device. The multiple supporting plates are arranged, the multiple sets of limiting devices and the multiple sets of fixing cylinders are arranged on the two sides of each supporting plate correspondingly, and the limiting devices and the fixing cylinders located on the same side of each supporting plate are arranged in a staggered mode. The limiting devices and the fixing cylinders on the two sides of each supporting plate are also arranged in a staggered mode. The supporting structure can meet the comprehensive requirements of strength, safety, high efficiency and economy reaching the standard.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of deep foundation pit construction and support, in particular to a combined deep foundation pit support structure and construction method. BACKGROUND

[0002] With the continuous advancement of urbanization process in China, the available land resources are gradually reduced, therefore, more and more buildings begin to expand to the underground, so it is necessary to carry out deep foundation pit excavation construction. In the process of deep foundation pit excavation construction, support structure is needed to support the deep foundation pit, and the support strength will directly determine the overall quality of the construction project and the safety of the surrounding existing buildings.

[0003] At present, the existing support methods include row piles, underground continuous walls, cement retaining walls, etc. These support methods have long construction period and high investment cost, and usually adopt fixed connection mode for installation of the support structure, which limits the adaptability of the entire support structure to the changes of the construction site topography. The installation and disassembly steps of such support structure are complex and difficult, which increases the workload and difficulty of the workers. The existing support structure cannot meet the comprehensive requirements of strength, safety, efficiency and economy.

[0004] Therefore, a combined deep foundation pit support structure and construction method is needed to solve the above technical problems. SUMMARY

[0005] To achieve the above purpose, in a first aspect, the present application provides a combined deep foundation pit support structure, comprising: a support plate, a fixed cylinder, a fixed insertion rod and a limiting device; Wherein, the support plate is configured as multiple, each of the support plates is provided with multiple sets of limiting devices and multiple sets of fixed cylinders on both sides, respectively, the limiting devices and the fixed cylinders on the same side of each support plate are arranged in a staggered manner, and the limiting devices and the fixed cylinders on both sides of each support plate are also arranged in a staggered manner.

[0006] Further, as a preferred, it further comprises a fixed platform and a diagonal brace assembly. Wherein, each of the support plates is connected with the fixed platform through the diagonal brace assembly, and the fixed platform is fixedly connected to the bottom end inside the deep foundation pit.

[0007] Further, as a preferred, a guard plate insertion pile is welded at the bottom of each support plate.

[0008] Further, as a preferred, multiple sets of anchor rod holes are uniformly provided on each support plate, and four sets of willow nail holes are provided at the four corner positions of each support plate. Multiple sets of anchor rods are installed in the anchor rod holes, and a rotatable threaded fixing block is provided at the head position of the anchor rod. Four groups of the willow peg holes are provided with willow pegs, and the anchor rod and the willow pegs jointly fix and connect the support plate on the inner side wall of the deep foundation pit.

[0009] Further, as a preferred, the fixed platform comprises: platform pegs, platform limiting grooves, platform limiting blocks, platform bolt seats and platform bases; The bottom end of the platform base is fixedly connected with a plurality of groups of platform pegs, and the top end of the platform base is provided with the platform limiting grooves, which are multi-stage groove holes; The platform limiting grooves are matched with the platform limiting blocks, and the platform limiting blocks are fixedly connected with the platform bolt seats at the ends away from the platform limiting grooves.

[0010] Further, as a preferred, each of the support plates is provided with a group of reserved holes at a lower middle position, and the group of reserved holes is composed of a rectangular array of bolt reserved holes.

[0011] Further, as a preferred, the inclined strut assembly comprises: connecting rods, bolts, connecting plates and inclined strut bolt seats; The connecting plates are fixedly connected with the inclined strut bolt seats on the side of the support plate away from the inner side wall of the deep foundation pit at the positions of the group of reserved holes; One end of the connecting rod is connected to the inclined strut bolt seat, and the other end is connected to the platform bolt seat.

[0012] Further, as a preferred, the limiting device comprises: limiting grooves, limiting blocks, clamping blocks, pressing handles, strong springs and rubber pads; The limiting grooves are provided on the support plates, and the limiting blocks are arranged in the limiting grooves; The limiting blocks are provided with grooves, and the strong springs are arranged in the grooves; the pressing handles are respectively connected to the two ends of the strong springs, and the rubber pads are connected to the ends of the pressing handles away from the strong springs through the clamping blocks; The side wall of the clamping block is slidingly connected to the inner wall of the groove of the limiting block.

[0013] In a second aspect, the present application provides a construction method of a combined deep foundation pit support structure, which comprises the following steps: Install the support plate: first, insert the support plate into the deep foundation pit inside the bottom end of the support plate, so that the support plate is attached to the inside wall of the deep foundation pit, and the willow nail is fixed on the inside wall of the deep foundation pit by the willow nail hole, and then the anchor rod is inserted into the anchor rod hole to strengthen the fixation of the support plate on the inside wall of the deep foundation pit, and the anchor rod is fixed on the inside wall of the deep foundation pit by the threaded fixing block. Install the fixed platform: first, fix the platform base on the inside bottom of the deep foundation pit by the platform stake, and determine the horizontal distance between the platform base and the support plate to determine one of the multi-stage slots in the platform limiting slot as the installation slot, and then the platform limiting block is inserted into the installation slot. Install the inclined strut assembly: fix the inclined strut bolt seat on the inside wall of the deep foundation pit by the connecting plate, and then connect the fixed platform and the support plate by the connecting rod. Assemble and install the support plate: adjust the limiting device to change the position of the fixed cylinder, and make the fixed cylinder axis of the adjacent two support plates in the same straight line, and then insert the fixed plug rod into the fixed cylinder in the vertical direction and insert it into the inside bottom of the deep foundation pit, and connect each support plate into a support whole.

[0014] Compared with the prior art, the present application provides a combined deep foundation pit support structure and construction method, which has the following advantages: Advantage one: the multiple support plates of the present application can be sequentially connected into a support whole by means of the fixed cylinder and the fixed plug rod. The staff can easily assemble and disassemble the support whole, greatly shortening the construction period, reducing the workload and difficulty of the staff, and reducing the construction cost.

[0015] Advantage two: the support structure of the present application can improve the adaptability to the change of the construction site terrain, that is, the support whole composed of multiple support plates can adapt to various types of inside walls of deep foundation pits.

[0016] Advantage three: the support plate in the present application is fixed to the inside wall of the deep foundation pit by adopting a three-level fixing mode, and is matched with the fixed platform and the inclined strut assembly, which enhances the strength and anti-lateral displacement and deformation capacity of the support structure of the present application.

[0017] Advantage four: the support structure of the present application can meet the comprehensive requirements of strength, safety, efficiency and economy. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is a combined deep foundation pit support structure support plate assembly installation diagram Figure One ; Figure 2 A schematic diagram of the assembly and installation of support plates for a combined deep foundation pit support structure. Figure Two ; Figure 3 A schematic diagram of a three-stage fixing structure for a combined deep foundation pit support plate; Figure 4 A schematic diagram of a limiting device for a combined deep foundation pit support structure; Figure 5 A schematic diagram of a fixed platform structure for a combined deep foundation pit support structure; Figure 6 A schematic diagram of the actual use of a combined deep foundation pit support structure. Figure One ; Figure 7 A schematic diagram of the actual use of a combined deep foundation pit support structure. Figure Two ; In the diagram: 1. Support plate; 2. Fixing cylinder; 3. Fixing rod; 4. Limiting device; 41. Limiting groove; 42. Limiting block; 43. Locking block; 44. Pressing handle; 45. Strong spring; 46. Rubber pad; 5. Anchor bolt hole; 6. Rivet hole; 7. Anchor bolt; 8. Threaded fixing locking block; 9. Rivet; 10. Bolt pre-drilled hole; 11. Fixing platform; 111. Platform stake; 112. Platform limiting groove; 113. Platform limiting block; 114. Platform bolt seat; 115. Platform base; 12. Diagonal brace assembly; 121. Connecting rod; 122. Bolt; 123. Connecting plate; 124. Diagonal brace bolt seat; 13. Protective plate stake. Detailed Implementation

[0019] Please see Figures 1-7 The present invention provides a combined deep foundation pit support structure, comprising: a support plate 1, a fixing cylinder 2, a fixing rod 3, and a limiting device 4; The support plate 1 is configured in multiple ways. Each support plate 1 is provided with multiple sets of limiting devices 4 and multiple sets of fixing cylinders 2 on both sides. The limiting devices 4 and fixing cylinders 2 on the same side of each support plate 1 are arranged in an alternating manner, and the limiting devices 4 and fixing cylinders 2 on both sides of each support plate 1 are also arranged in an alternating manner.

[0020] In this embodiment, please refer to Figure 2 As shown, in this invention, multiple support plates 1 can be assembled into a single support unit, and adjacent support plates 1 are connected by a fixing cylinder 2 and a fixing rod 3. Specifically: by Figure 2 Taking the No. 1 support plate 1 of the middle ring and the No. 2 support plate 1 of the ring as examples, the two support plates 1 are attached to the inner wall of the deep foundation pit and brought close to each other (e.g., Figure 2The fixing cylinder 2 on the No. 1 ring support plate 1 is aligned with the limiting device 4 on the No. 2 ring support plate 1 (as the limiting device 4 and the fixing cylinder 2 on both sides of each support plate 1 are also staggered, the fixing cylinder 2 on the No. 2 ring support plate 1 will also be aligned with the limiting device 4 on the No. 1 ring support plate 1 at this time). When the fixing cylinder 2 on the No. 1 ring support plate 1 contacts the limiting device 4 on the No. 2 ring support plate 1, the two support plates 1 reach the installation position, and then the position calibration operation of the two support plates 1 needs to be performed. After the calibration operation is completed, the fixed insertion rod 3 is sequentially inserted into the fixing cylinder 2 between the two support plates 1 from top to bottom in the vertical direction and then inserted into the bottom end of the deep foundation pit, thereby completing the combined installation of the two support plates 1.

[0021] As a preferred embodiment, it should be noted that, by analogy, a plurality of support plates 1 can be sequentially connected to form a support whole. The staff can easily complete the assembly and disassembly of the support whole, greatly shortening the construction period, reducing the workload and difficulty of the staff, and reducing the construction cost.

[0022] It should be noted that, since each support plate 1 needs to be attached to the inner side wall of the deep foundation pit first and then subsequent operations are performed, and the fixing cylinder 2 type connection is used between the adjacent two support plates 1, the support structure of the present application can improve the adaptability to the topographic changes of the construction site, that is, the support whole composed of a plurality of support plates 1 can adapt to various types of inner side walls of deep foundation pits (such as shown in Figure 6 and Figure 7 ).

[0023] Further, it further comprises a fixed platform 11 and a diagonal bracing assembly 12. Each of the support plates 1 is connected to the fixed platform 11 through the diagonal bracing assembly 12, and the fixed platform 11 is fixedly connected to the bottom end of the deep foundation pit.

[0024] Further, each of the support plates 1 is welded with a support plate insertion pile 13 at the bottom.

[0025] Further, a plurality of groups of anchor rod holes 5 are uniformly formed on each of the support plates 1, and four groups of willow dowel holes 6 are formed at the four corners of each of the support plates 1. An anchor rod 7 is installed in each of the plurality of groups of anchor rod holes 5, and a rotatable threaded fixing block 8 is arranged at the head position of the anchor rod 7. A willow dowel 9 is installed in each of the four groups of willow dowel holes 6, and the anchor rod 7 and the willow dowel 9 jointly fix and connect the support plate 1 to the inner side wall of the deep foundation pit.

[0026] In this embodiment, the support plate 1 in the present application is fixed to the inner side wall of the deep foundation pit in a three-level fixing mode. Specifically: First, the support plate 1 is tightly attached to the inner wall of the deep foundation pit, and the support plate stake 13 at its bottom end is inserted into the bottom of the deep foundation pit to complete the first-level fixation; second, rivets 9 are driven into the four sets of rivet holes 6 located at the four corners to tightly fix the four edges of the support plate 1 to the inner wall of the deep foundation pit to complete the second-level fixation; finally, anchor rods 7 are driven into the multiple sets of anchor bolt holes 5 that have been reserved in advance to tightly fix the middle part of the support plate 1 to the inner wall of the deep foundation pit, and the end of the anchor rod 7 away from the inner wall of the deep foundation pit is clamped by the threaded fixing block 8 to complete the third-level fixation.

[0027] The above-mentioned three-level fixing mode for the support plate 1 can improve the support plate 1's resistance to lateral displacement and deformation, laying a solid foundation for the final support strength of the present invention.

[0028] It should be noted that anchor hole 5 is a quincunx-shaped pre-reserved hole, and anchor 7 is an expansion shell type prestressed hollow grouting anchor.

[0029] Furthermore, the fixed platform 11 includes: platform stakes 111, platform limiting grooves 112, platform limiting blocks 113, platform bolt seats 114, and platform bases 115; Among them, the bottom end of the platform base 115 is fixedly connected with multiple sets of platform stakes 111, and the top end of the platform base 115 is provided with the platform limiting groove 112, which is a multi-level slot hole arrangement; The platform limiting block 113 is connected in the platform limiting groove 112, and the platform bolt seat 114 is fixedly connected to one end of the platform limiting block 113 away from the platform limiting groove 112.

[0030] Furthermore, each of the support plates 1 has a reserved hole group at the lower center position, the reserved hole group consisting of a rectangular array of bolt reserved holes 10.

[0031] Furthermore, the diagonal brace assembly 12 includes: a connecting rod 121, a bolt 122, a connecting plate 123, and a diagonal brace bolt seat 124; Wherein, the support plate 1 is connected to the connecting plate 123 by the bolt 122 at the position of the reserved hole group on the side away from the inner wall of the deep foundation pit, and the diagonal brace bolt seat 124 is fixedly connected to the connecting plate 123; One end of the connecting rod 121 is connected to the diagonal brace bolt seat 124, and the other end is connected to the platform bolt seat 114.

[0032] In this embodiment, the present invention additionally adds a fixed platform 11 and a diagonal brace assembly 12 to further improve the overall strength of the support structure. Specifically: Please see Figure 5As shown, first, the platform base 115 is fixed to the bottom end inside the deep foundation pit through the platform stake 111, and the distance between the platform base 115 and the supporting plate 1 is determined according to the specific situation. According to the horizontal distance between the platform base 115 and the supporting plate 1, one of the multiple slot holes in the platform limiting groove 112 on the platform base 115 is selected as the installation slot hole, and then the platform limiting block 113 is matched and connected into the installation slot hole.

[0033] As shown in Figure 1 and Figure 3 As shown, first, the connecting plate 123 is fixed to the bolt reserved hole 10 position on the supporting plate 1 through the bolt 122, and the connecting plate 123 is fixed with the inclined support bolt seat 124 on the side away from the supporting plate 1, and then the fixed platform 11 is connected with the supporting plate 1 through the connecting rod 121.

[0034] The fixed platform 11 can be flexibly adjusted and moved according to the site conditions, and the supporting plate 1 can also be connected with the fixed platform 11 in different positions through the inclined support assembly 12, which not only greatly increases the site adaptability and overall adjustability of the supporting structure, but also further enhances the overall anti-lateral displacement and anti-deformation ability of the supporting structure.

[0035] Further, the limiting device 4 comprises a limiting groove 41, a limiting block 42, a clamping block 43, a pressing handle 44, a strong spring 45 and a rubber pad 46; The limiting groove 41 is provided on the supporting plate 1, and the limiting block 42 is arranged in the limiting groove 41; The limiting block 42 is provided with a groove, and the strong spring 45 is arranged in the groove; the strong spring 45 is connected with the pressing handle 44 at both ends, and the pressing handle 44 is connected with the rubber pad 46 through the clamping block 43 away from the strong spring 45; The side wall of the clamping block 43 is slidably connected with the inner wall of the groove on the limiting block 42.

[0036] As a preferred embodiment, the limiting device 4 of the present application can efficiently help to complete the position calibration operation before the combined installation of the two adjacent supporting plates 1, specifically: As shown in Figure 2 and Figure 4As shown, the clamping block 43 can be finely adjusted along the groove on the limiting block 42 by means of the strong spring 45. When the No. 1 ring support plate 1 and the No. 2 ring support plate 1 are close to each other to the fixed cylinder 2 on the No. 1 ring support plate 1 abutting against the clamping block 43 and the rubber pad 46 of the limiting device 4 on the No. 2 ring support plate 1 (at the same time, the fixed cylinder 2 on the No. 2 ring support plate 1 also abuts against the clamping block 43 and the rubber pad 46 of the limiting device 4 on the No. 1 ring support plate 1), the position calibration operation of the adjacent two support plates 1 can be performed by means of the fine adjustment of the clamping block 43. So that the axis of the fixed cylinder 2 between the adjacent two support plates 1 is located on the same straight line, the staff can smoothly insert the fixed insertion rod 3 to complete the combined installation between the multiple support plates 1, improve the efficiency of the combined installation of the support plate 1, and shorten the construction time of the support structure.

[0037] It should be noted that the rubber pad 46 is a butadiene rubber shock pad. Since the support plate 1 is calibrated by the limiting device 4, the wear of the support plate 1 by the limiting device 4 during the operation can be avoided.

[0038] In summary, the support plate 1 is tightly fixed on the inner wall of the deep foundation pit by adopting the three-level fixing mode, and the fixed platform 11 and the inclined support assembly 12 are used to enhance the anti-lateral displacement and anti-deformation ability of the whole support structure. The fixed cylinder 2 and the fixed insertion rod 3 are used to combine and install the support plates 1 into a support whole that can adapt to different types of deep foundation pits. The components of the support structure of the present application are simple and low in cost. Therefore, the support structure of the present application can meet the comprehensive requirements of strength, safety, efficiency and economy.

[0039] It should be noted that the following will summarize the general construction method steps of the support structure of the present application, and the specific details of each step have been described above.

[0040] Further, the present application provides a construction method of a combined deep foundation pit support structure, which comprises the following steps: Install the support plate 1: first, insert the support plate stake 13 at the bottom end of the support plate 1 into the deep foundation pit, so that the support plate 1 is attached to the inner wall of the deep foundation pit, and then insert the anchor rod 7 into the anchor rod hole 5 to strengthen and fix the support plate 1 on the inner wall of the deep foundation pit, and finally, clamp the end of the anchor rod 7 away from the inner wall of the deep foundation pit by the threaded clamping block 8. The fixed platform 11 is installed: first, the platform base 115 is fixed to the bottom end inside the deep foundation pit through the platform stake 111, according to the horizontal distance between the platform base 115 and the support plate 1, one of the multiple slot holes in the platform limiting groove 112 on the platform base 115 is determined as the installation slot hole, and the platform limiting block 113 is matched and connected into the installation slot hole; The inclined strut assembly 12 is installed: the inclined strut bolt seat 124 is fixed to the inner wall of the deep foundation pit through the connecting plate 123, and then the fixed platform 11 and the support plate 1 are connected through the connecting rod 121; The support plate 1 is combined and installed: the position of the fixed cylinder 2 is changed by adjusting the limiting device 4, the axis of the fixed cylinder 2 between two adjacent support plates 1 is in the same straight line, and then the fixed plug rod 3 is sequentially inserted into the fixed cylinder 2 along the vertical direction and inserted into the bottom end inside the deep foundation pit, so that each support plate 1 is connected as a support whole.

[0041] It should be noted that the installation of the support plate 1 and the combined installation of the support plate 1 can be flexibly adjusted in sequence according to the actual situation, as long as the support structure can be successfully combined. Figure 1 、 Figure 2 、and Figure 3 The number of fixed cylinders 2 and limiting devices 4 on both sides of the support plate 1 in the present application is not limited to that shown in

[0042] The above is only a preferred specific embodiment of the present application, but the protection scope of the present application is not limited thereto, any person skilled in the art can make equivalent replacement or change according to the technical solution and the inventive concept of the present application within the technical range disclosed by the present application, which should be covered within the protection scope of the present application.

Claims

1. A combined deep foundation pit support structure, characterized by: The utility model relates to a deep foundation pit support structure, including: Supporting plate (1), fixed cylinder (2), fixed plug rod (3) and limiting device (4); Wherein, the supporting plate (1) is configured as multiple, each supporting plate (1) is provided with multiple groups of limiting device (4) and multiple groups of fixed cylinder (2) on both sides respectively, the limiting device (4) and the fixed cylinder (2) on the same side of each supporting plate (1) are staggered arrangement, the limiting device (4) and the fixed cylinder (2) on both sides of each supporting plate (1) are also staggered arrangement.

2. The combined deep foundation pit support structure according to claim 1, characterized in that: Also including: Fixed platform (11) and inclined strut assembly (12); Wherein, each supporting plate (1) is connected with fixed platform (11) through inclined strut assembly (12), and fixed platform (11) is fixedly connected to the bottom end inside deep foundation pit.

3. The combined deep foundation pit support structure according to claim 1, characterized in that: The bottom of each supporting plate (1) is welded with a guard plate stake (13).

4. The combined deep foundation pit support structure according to claim 1, characterized in that: Multiple groups of anchor rod holes (5) are uniformly formed on each supporting plate (1), and four groups of willow nail holes (6) are formed at the four corners of each supporting plate (1). Multiple groups of anchor rods (7) are installed in multiple groups of anchor rod holes (5), and a rotatable threaded fixing block (8) is arranged at the head of the anchor rod (7). Four groups of willow nails (9) are installed in four groups of willow nail holes (6), and the anchor rod (7) and the willow nail (9) jointly fix and connect the supporting plate (1) to the inner side wall of the deep foundation pit.

5. The combined deep foundation pit support structure according to claim 2, characterized in that: The fixed platform (11) comprises a platform stake (111), a platform limiting groove (112), a platform limiting block (113), a platform bolt seat (114) and a platform base (115). Wherein, the bottom end of the platform base (115) is fixedly connected with multiple groups of platform stakes (111), and the top end of the platform base (115) is provided with the platform limiting groove (112), and the platform limiting groove (112) is provided with multiple levels of slot holes. The platform limiting groove (112) is connected with the platform limiting block (113) in a matching mode, and the platform limiting block (113) is fixedly connected with the platform bolt seat (114) at one end away from the platform limiting groove (112).

6. A combined deep foundation pit support structure according to claim 5, characterized in that: Each supporting plate (1) is provided with a group of reserved holes at the middle lower side, and the group of reserved holes comprises a rectangular array of bolt reserved holes (10).

7. A combined deep foundation pit support structure according to claim 6, characterized in that: The inclined strut assembly (12) comprises a connecting rod (121), a bolt (122), a connecting plate (123) and an inclined strut bolt seat (124). Wherein, the side of the supporting plate (1) away from the inner side wall of the deep foundation pit is connected with the connecting plate (123) at the position of the group of reserved holes through the bolt (122), and the connecting plate (123) is fixedly connected with the inclined strut bolt seat (124). One end of the connecting rod (121) is connected to the inclined strut bolt seat (124), and the other end is connected to the platform bolt seat (114).

8. The combined deep foundation pit support structure according to claim 1, characterized in that: The limiting device (4) comprises a limiting groove (41), a limiting block (42), a clamping block (43), a pressing handle (44), a powerful spring (45) and a rubber pad (46). The limiting groove (41) is arranged on the supporting plate (1), and the limiting block (42) is arranged in the limiting groove (41). A groove is arranged on the limiting block (42), and the strong spring (45) is arranged in the groove; the strong spring (45) is connected with the pressing handle (44) at two ends, and the pressing handle (44) is connected with the rubber pad (46) through the clamping block (43) at an end away from the strong spring (45). The side wall of the clamping block (43) is in sliding connection with the inner wall of the groove on the limiting block (42).

9. The construction method of a combined deep foundation pit support structure according to any one of claims 1-8, characterized in that: The following steps are included: The supporting plate (1) is installed: first, the supporting plate (1) is inserted into the bottom end of the deep foundation pit through the supporting plate insertion stake (13), so that the supporting plate (1) is attached to the inner side wall of the deep foundation pit, the supporting plate (1) is fixed on the inner side wall of the deep foundation pit through the willow nail hole (6) and the willow nail (9), and the anchor rod (7) is inserted into the anchor rod hole (5) that is previously reserved and completed, so that the supporting plate (1) is fixed on the inner side wall of the deep foundation pit, and the end of the anchor rod (7) away from the inner side wall of the deep foundation pit is clamped through the threaded fixing clamping block (8); The fixed platform (11) is installed: first, the platform base (115) is fixed on the bottom end of the deep foundation pit through the platform insertion stake (111), and the horizontal distance between the platform base (115) and the supporting plate (1) is determined to determine one of the multiple slot holes in the platform limiting groove (112) on the platform base (115) as the installation slot hole for this time, and the platform limiting block (113) is matched and connected into the installation slot hole; The inclined strut assembly (12) is installed: the inclined strut bolt seat (124) is fixed on the inner wall of the deep foundation pit through the connecting plate (123), and then the fixed platform (11) and the supporting plate (1) are connected through the connecting rod (121); The supporting plate (1) is combined and installed: the position of the fixing cylinder (2) is changed through the limiting device (4), the axis of the fixing cylinder (2) between two adjacent supporting plates (1) is in the same straight line, the fixing insertion rod (3) is sequentially inserted into the fixing cylinder (2) in the vertical direction and inserted into the bottom end of the deep foundation pit, and the supporting plates (1) are connected as a supporting whole.

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