Emergency cofferdam for deep foundation pit leakage and its construction method

Abstract

The present invention provides a deep foundation pit water leakage emergency rescue cofferdam and its construction method, which solves the problem that the existing cofferdam adopts a construction method of piling cement bags or earth bags around the water leakage, which takes a long time and cannot meet the rapid construction requirements for emergency treatment of the water leakage. The cofferdam structure of the present invention has a fast construction speed, which meets the rapid construction requirements for emergency treatment of the water leakage. In addition, the height of the first side enclosure and the second side enclosure can be adjusted to meet the cofferdam requirements of leakage points of different heights. At the same time, the various components of the first side enclosure and the second side enclosure can be used repeatedly, saving engineering costs. Moreover, the various components can be removed from each other, saving storage space.

Description

Technical Field

[0001] The invention relates to the technical field of building construction, in particular to a deep foundation pit water leakage emergency rescue cofferdam and a construction method thereof. Background Art

[0002] During deep foundation pit excavation, water leakage from the retaining structures during the earthwork phase is a key concern. Leakage in the retaining structures causes soil particles to move under the influence of the seeping water, causing fine particles within the soil skeleton to be carried away by the seepage, forming water channels. These water channels are also known as piping. The amount of sediment carried by piping increases with the amount of water flowing, and in severe cases, it can cause the foundation pit to collapse or shift.

[0003] To address the problem of serious water leakage in the retaining structure of deep foundation pits, the conventional treatment method is to drain and seal the leakage with steel plates in the deep foundation pit, inject cement outside the deep foundation pit, construct a cofferdam in the deep foundation pit, and pour concrete in the cofferdam to seal the leakage.

[0004] The existing cofferdam method generally involves piling cement bags or earth bags around the leaking water. However, the construction of cement bags or earth bags requires a lot of manpower, material resources and time, and is prone to collapse. When the cement bags or earth bags are filled on site, it takes even more time, which makes it difficult to meet the rapid construction needs of emergency treatment of leaking water. Summary of the Invention

[0005] In order to solve the problem in the background technology that the existing cofferdam adopts the construction method of piling cement bags or earth bags around the leakage point, which takes a long time and is difficult to meet the rapid construction demand for emergency treatment of the leakage point, the present invention proposes a deep foundation pit leakage rescue cofferdam and a construction method thereof.

[0006] The technical solution of the present invention is: a deep foundation pit leakage rescue cofferdam includes a first side enclosure and two second side enclosures vertically arranged at the bottom of the deep foundation pit, the first side enclosure is parallel to the underground continuous wall, the first side enclosure extends in the left-right direction, the two second side enclosures are detachably arranged on the left and right sides of the first side enclosure, the second side enclosure extends in the front-back direction, and the rear ends of the second side enclosures abut against the underground continuous wall;

[0007] The second side enclosure, the first side enclosure, the second side enclosure and the underground continuous wall are connected end to end to block the leakage on the underground continuous wall;

[0008] The first side enclosure includes a plurality of first enclosure panels that are detachably connected to each other, and the second side enclosure includes a plurality of second enclosure panels that are detachably connected to each other;

[0009] The outer sides of the first enclosure plate at the left and right edges of the first side enclosure and the second enclosure plate at the front and rear edges of the second side enclosure are fixed with corresponding upper and lower rope ring members, and the rope ring members include a first rope ring;

[0010] The first rope ring at the top of the same row is detachably fixedly connected to the upper end of the cable, and the lower end of the cable passes through the remaining first rope rings in the same row from top to bottom and is detachably fixedly connected to the anchor rod, which is anchored at the bottom of the deep foundation pit;

[0011] The outer sides of the first side enclosure and the second side enclosure are both provided with inclined bracing rods, and the lower ends of the oblique bracing rods are against the bottom of the deep foundation pit.

[0012] Preferably, a first connecting fence is provided between the upper and lower adjacent first enclosure panels along the left and right directions, the length of the first connecting fence is equal to the left and right spacing length of the two second side enclosures, and the first enclosure panels are detachably connected to the adjacent first connecting fences;

[0013] The bottom of the lowest first enclosure plate is detachably connected to a first bottom fence, which extends in the front-to-back direction. The length of the first bottom fence is greater than or equal to the left-right spacing length of the two second side enclosures.

[0014] Preferably, a second connecting fence along the front-to-back direction is provided between the upper and lower adjacent second enclosure plates, and the second enclosure plates are detachably connected to the upper and lower adjacent second connecting fences;

[0015] The bottom of the lowest second connecting fence is detachably connected to the second bottom fence, and the front and rear lengths of the second connecting fence and the second bottom fence are equal.

[0016] Preferably, the outer sides of the first connecting fence and the first bottom fence are both provided with rope rings, and the rope rings on the first connecting fence and the first bottom fence correspond one to one with the rope rings on the first enclosure plate;

[0017] Rope rings are provided on the outer sides of the second connecting fence and the second bottom fence, and the rope rings on the second connecting fence and the second bottom fence correspond to the rope rings on the second enclosure plate one by one.

[0018] Preferably, a mounting tube is fixedly provided on the outer sides of the first side enclosure and the two second side enclosures. The mounting tube is a tubular structure that is transparent from top to bottom. The mounting tube on the first side enclosure is located on the outer side of one of the first connecting fences, and the mounting tube on the second side enclosure is located on the outer side of one of the second connecting fences.

[0019] The diagonal support rod is a telescopic rod structure with adjustable length. The upper end of the diagonal support rod is fixedly connected with a vertically arranged insertion rod, and the insertion rod is movably inserted in the installation tube.

[0020] Preferably, the bottoms of the first bottom fence and the first connecting fence are both fixed with vertically arranged drill rods, and the drill rods are vertically inserted into the bottom of the deep foundation pit.

[0021] A construction method for emergency rescue cofferdam for water leakage in a deep foundation pit includes the following construction steps: S1: first, splicing a first bottom fence and second bottom fences on both sides, and placing the rear ends of the second bottom fences against an underground continuous wall so that the leakage is located between the two second bottom fences;

[0022] S2~ driving the drill rods at the bottom of the first bottom fence and the first connecting fence into the bottom of the deep foundation pit;

[0023] S3~ On the first bottom fence, alternately splice the first enclosure plate and the first connecting fence from bottom to top, and on the second bottom fence, alternately splice the second enclosure plate and the second connecting fence from bottom to top, and ensure that the top of the first enclosure plate is spliced ​​with the first connecting fence, and ensure that the top of the second enclosure plate is spliced ​​with the second connecting fence, to form the first side enclosure and the second side enclosure;

[0024] S4~ Install diagonal braces on the outer sides of the first side enclosure and the second side enclosure so that the lower ends of the diagonal braces rest against the bottom of the deep foundation pit;

[0025] S5~ Tie and fix the upper end of the cable to the rope ring parts on the first side enclosure and the second side enclosure, pass the lower end of the cable through the first rope ring of the remaining rope ring parts in the same row from top to bottom, and then detachably fix it to the anchor rod, and anchor the anchor rod to the bottom of the deep foundation pit.

[0026] The advantages of the present invention are: when in use, the first enclosure plates at the left and right edges of the first side enclosure and the second enclosure plates at the front and rear edges of the second side enclosure are fixed together in the upper and lower directions by tensioning cables, so as to prevent the first enclosure plates and the second enclosure plates from slipping during use; secondly, the combination of the cables and the anchor rods enables the first side enclosure and the second side enclosure to cooperate with the diagonal support rods when in use, forming a pulling and pushing force, so that the first side enclosure and the second side enclosure can stably maintain their state during use, providing a stable template structure for subsequent concrete pouring.

[0027] The cofferdam structure of the present invention has a fast construction speed and meets the rapid construction requirements for emergency treatment of water leakage. Moreover, the heights of the first side enclosure and the second side enclosure can be adjusted to meet the cofferdam requirements of leakage points at different heights. At the same time, the various components of the first side enclosure and the second side enclosure can be repeatedly used, saving engineering costs, and the various components can be disassembled from each other to save space occupied during storage. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] 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.

[0029] Figure 1 This is a schematic diagram of the main structure of the cofferdam in Example 1 when it is in use from a top view;

[0030] Figure 2 for Figure 1 A schematic structural diagram of the first side enclosure in FIG.

[0031] Figure 3 for Figure 2 A schematic diagram of the structure of the main viewing angle;

[0032] Figure 4 for Figure 3 A schematic diagram of the structure from the right perspective;

[0033] Figure 5 for Figure 3 A schematic diagram of the three-dimensional structure of the first baffle plate in FIG.

[0034] Figure 6 for Figure 3 A schematic diagram of the three-dimensional structure of the first bottom fence;

[0035] Figure 7 for Figure 1 A schematic structural diagram of the second side enclosure in FIG.

[0036] Figure 8 for Figure 7 A structural diagram of the main viewing angle;

[0037] Figure 9 for Figure 8 A schematic diagram of the structure from the right perspective;

[0038] Figure 10 for Figure 8 A schematic diagram of the three-dimensional structure of the second baffle plate;

[0039] Figure 11 for Figure 1 Schematic diagram of the three-dimensional structure of the anchor rod;

[0040] Figure 12 for Figure 1 Schematic diagram of the three-dimensional structure of the diagonal brace;

[0041] In the figure, 1. underground continuous wall, 2. leakage point, 3. first side enclosure, 4. second side enclosure, 5. rope ring, 6. cable, 7. anchor rod, 701. anchor rod body, 702. second connecting rod, 703. second rope ring, 8. mounting pipe, 9. diagonal support rod, 901. plug rod, 902. screw rod, 903. threaded sleeve, 10. first bottom fence, 1001. slot, 11. first enclosure plate, 12. first connecting fence, 13. first slot, 14. first plug plate, 15. second slot, 16. second bottom fence, 1601. clamping head, 17. second enclosure plate, 18. second connecting fence, 19. first T-slot, 20. first T-bar, 21. drill rod. DETAILED DESCRIPTION

[0042] 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. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without creative work are within the scope of protection of the present invention.

[0043] Example 1: Emergency cofferdam for deep foundation pit leakage, such as Figure 1 As shown, it includes a first side enclosure 3 and two second side enclosures 4 vertically arranged at the bottom of the deep foundation pit. The first side enclosure 3 is parallel to the underground continuous wall 1 and extends in the left-right direction. The two second side enclosures 4 are detachably arranged on the left and right sides of the first side enclosure 3. The second side enclosure 4 extends in the front-to-back direction, and the rear ends of the second side enclosures 4 abut against the underground continuous wall 1. The second side enclosures 4, the first side enclosure 3, the second side enclosures 4 and the underground continuous wall 1 are connected end to end to enclose the leakage 2 on the underground continuous wall 1.

[0044] like Figure 2 and Figure 3 As shown, the first side enclosure 3 includes a plurality of first enclosure panels 11 that are detachably connected to each other, and a first connecting fence 12 along the left and right directions is provided between the upper and lower adjacent first enclosure panels 11. The length of the first connecting fence 12 is equal to the left and right spacing length of the two second side enclosures 4, and the first enclosure panels 11 are detachably connected to the adjacent first connecting fences 12.

[0045] The bottom of the lowest first enclosure plate 11 is detachably connected to a first bottom fence 10 , which extends in the front-to-back direction. The length of the first bottom fence 10 is greater than the left-right spacing length of the two second side enclosures 4 .

[0046] Specifically, such as Figure 5As shown, a first slot 13 is provided on the top of the first enclosure plate 11 . The first slot 13 is a structure that is transparent on the left and right and open on the top. A first plug-in plate 14 is provided on the bottom of the first enclosure plate 11 .

[0047] The tops of the first bottom fence 10 and the first connecting fence 12 are both provided with a second slot 15 which is transparent on the left and right and open on the top. The second slot 15 has the same structure as the first slot 13, and the upper and lower adjacent first plug-in boards 14 and second slots 15 are pluggable connected.

[0048] A second plug-in board is provided at the bottom of the first connecting fence 12 . The second plug-in board has the same structure as the first plug-in board 14 . The upper and lower adjacent second plug-in boards are pluggably connected to the first slot 13 .

[0049] The first bottom fence 10 and the first connecting fence 12 are used to connect the first enclosure panels 11 of the same layer into a whole.

[0050] like Figure 6 As shown, both left and right ends of the first bottom fence 10 are provided with a card slot 1001 which is open on the top and transparent from front to back. The card slot 1001 is located on the left and right sides of the second slot 15.

[0051] like Figure 8 and Figure 9 As shown, the second side enclosure 4 comprises a plurality of removably connected second enclosure panels 17. Second connecting rails 18 are provided between adjacent second enclosure panels 17 along the front-to-back direction. The second enclosure panels 17 are removably connected to the adjacent second connecting rails 18. The bottom of the lowest second connecting rail 18 is removably connected to the second bottom rail 16. The second connecting rail 18 and the second bottom rail 16 have equal front-to-back lengths.

[0052] Specifically, such as Figure 9 and Figure 10 As shown, a first T-shaped slot 19 that is transparent from front to back and open at the top is provided on the top of the second baffle plate 17, and a first T-shaped strip 20 extending along the front-to-back direction is provided on the bottom of the second baffle plate 17.

[0053] The tops of the second bottom fence 16 and the second connecting fence 18 are both provided with second T-shaped slots that are transparent from front to back and open at the top, and the bottom of the second connecting fence 18 is provided with a second T-shaped bar extending along the front-to-back direction.

[0054] The first T-shaped bars 20 adjacent to each other vertically are slidably clamped in the second T-shaped grooves, and the second T-shaped bars adjacent to each other vertically are slidably clamped in the first T-shaped grooves 19.

[0055] The second bottom fence 16 and the second connecting fence 18 are used to connect the second enclosure panels 17 on the same layer into a whole.

[0056] like Figure 1As shown, the outer sides of the first enclosure plate 11 at the left and right edges of the first side enclosure 3 and the second enclosure plate 17 at the front and rear edges of the second side enclosure 4 are fixed with corresponding upper and lower rope ring parts 5, and the rope ring parts 5 include a first rope ring.

[0057] In order to further improve the structural stability of the first side panel 3 and the second side panel 4 when in use, Figure 2 and Figure 8 As shown, the outer sides of the first connecting fence 12 and the first bottom fence 10 are both provided with rope rings 5, and the rope rings 5 ​​on the first connecting fence 12 and the first bottom fence 10 correspond one to one with the rope rings 5 ​​on the first enclosure plate 11;

[0058] Rope rings 5 ​​are provided on the outer sides of the second connecting fence 18 and the second bottom fence 16 . The rope rings 5 ​​on the second connecting fence 18 and the second bottom fence 16 correspond to the rope rings 5 ​​on the second enclosure plate 17 one by one.

[0059] The first rope ring at the top of the same row is detachably fixedly connected to the upper end of the cable 6, and the lower end of the cable 6 passes through the remaining first rope rings in the same row from top to bottom and is detachably fixedly connected to the anchor rod 7. Figure 11 As shown, the anchor rod 7 includes an anchor rod body 701, and the side of the anchor rod body 701 is vertically fixedly connected to a second connecting rod 702. The second connecting rod 702 is fixed with a second rope ring 703 at one end away from the anchor rod body 701. The lower end of the cable 6 is tied and fixed to the second rope ring 703, and the anchor rod body 701 is anchored at the bottom of the deep foundation pit.

[0060] The outer sides of the first side enclosure 3 and the two second side enclosures 4 are fixed with mounting tubes 8. The mounting tubes 8 are tubular structures that are transparent from top to bottom. The mounting tubes 8 on the first side enclosure 3 are located on the outer side of one of the first connecting fences 12, and the mounting tubes 8 on the second side enclosure 4 are located on the outer side of one of the second connecting fences 18.

[0061] The outer sides of the first side enclosure 3 and the second side enclosure 4 are both provided with obliquely arranged diagonal bracing rods 9, which are telescopic rod structures with adjustable lengths. Specifically, Figure 12 As shown, the diagonal brace 9 includes a screw rod 902 and a threaded sleeve 903 threadedly connected thereto. The upper end of the diagonal brace 9 is fixedly connected to a vertically arranged insertion rod 901, which is movably inserted into the mounting tube 8. The lower end of the threaded sleeve 903 is provided with a pointed head, which is inserted into the bottom of the deep foundation pit.

[0062] In order to further enhance the stability of the first side enclosure 3 and the second side enclosure 4 during use, a vertically arranged drill rod 21 is fixed to the bottom of the first bottom fence 10 and the first connecting fence 12. When in use, the drill rod 21 is vertically inserted into the bottom of the deep foundation pit.

[0063] The construction method of the emergency cofferdam for deep foundation pit leakage includes the following construction steps: S1~ First, the first bottom fence 10 and the second bottom fences 16 on the left and right sides are spliced ​​together, and the rear ends of the second bottom fences 16 are placed against the underground continuous wall 1, so that the leakage point 2 is located between the left and right second bottom fences 16;

[0064] S2~ driving the drill rods 21 at the bottom of the first bottom fence 10 and the first connecting fence 12 into the bottom of the deep foundation pit;

[0065] S3~ On the first bottom fence 10, the first enclosure plate 11 and the first connecting fence 12 are staggered and spliced ​​in sequence from bottom to top. On the second bottom fence 16, the second enclosure plate 17 and the second connecting fence 18 are staggered and spliced ​​in sequence from bottom to top. Ensure that the top of the first enclosure plate 11 is spliced ​​with the first connecting fence 12, and ensure that the top of the second enclosure plate 17 is spliced ​​with the second connecting fence 18, to form the first side enclosure 3 and the second side enclosure 4;

[0066] S4~ Install the diagonal brace 9 on the outside of the first side enclosure 3 and the second side enclosure 4, so that the lower end of the diagonal brace 9 rests on the bottom of the deep foundation pit;

[0067] S5~ Tie and fix the upper end of the cable 6 to the rope ring parts 5 on the first side enclosure 3 and the second side enclosure 4, and pass the lower end of the cable 6 through the first rope rings of the remaining rope ring parts 5 in the same row from top to bottom, and then detachably fix them to the anchor rod 7, and anchor the anchor rod 7 at the bottom of the deep foundation pit.

[0068] Working principle: The first enclosure plate 11 at the left and right edges of the first side enclosure 3 and the second enclosure plate 17 at the front and rear edges of the second side enclosure 4 are fixed together in the upper and lower directions through the tensioned cable 6. First, it prevents the first enclosure plate 11 and the second enclosure plate 17 from slipping during use; second, the cable 6 and the anchor rod 7 are combined to enable the first side enclosure 3 and the second side enclosure 4 to cooperate with the diagonal support rod 9 when in use, forming a pulling and pushing force, so that the first side enclosure 3 and the second side enclosure 4 can maintain their state stably during use, providing a stable template structure for subsequent concrete pouring.

[0069] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is limited by the appended claims rather than the foregoing description, and it is intended that all variations within the meaning and range of equivalents of the claims be embraced therein. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

Claims

1. Deep foundation pit leakage rescue cofferdam, characterized by: It comprises a first side enclosure (3) and two second side enclosures (4) vertically arranged at the bottom of a deep foundation pit, wherein the first side enclosure (3) is parallel to the underground continuous wall (1), the first side enclosure (3) extends in the left-right direction, the two second side enclosures (4) are detachably arranged on the left and right sides of the first side enclosure (3), the second side enclosure (4) extends in the front-back direction, and the rear end of the second side enclosure (4) abuts against the underground continuous wall (1); The second side enclosure (4), the first side enclosure (3), the second side enclosure (4) and the underground continuous wall (1) are connected end to end to enclose the leakage point (2) on the underground continuous wall (1); The first side enclosure (3) includes a plurality of first enclosure panels (11) that are detachably connected to each other, and the second side enclosure (4) includes a plurality of second enclosure panels (17) that are detachably connected to each other. The outer sides of the first enclosure plate (11) at the left and right edges of the first side enclosure (3) and the second enclosure plate (17) at the front and rear edges of the second side enclosure (4) are fixedly provided with upper and lower corresponding rope ring members (5), and the rope ring member (5) includes a first rope ring; The first rope ring at the top of the same row is detachably fixedly connected to the upper end of the cable (6), and the lower end of the cable (6) passes through the remaining first rope rings in the same row from top to bottom and is detachably fixedly connected to the anchor rod (7), and the anchor rod (7) is anchored at the bottom of the deep foundation pit; The outer sides of the first side enclosure (3) and the second side enclosure (4) are both provided with inclined bracing rods (9), and the lower ends of the inclined bracing rods (9) abut against the bottom of the deep foundation pit.

2. The deep foundation pit water leakage rescue cofferdam according to claim 1, characterized in that: A first connecting fence (12) is provided between upper and lower adjacent first enclosure plates (11) along the left and right directions, the length of the first connecting fence (12) being equal to the left and right spacing length of the two second side enclosure plates (4), and the first enclosure plates (11) and the adjacent first connecting fences (12) are detachably connected; The bottom of the lowest first enclosure plate (11) is detachably connected to a first bottom fence (10), the first bottom fence (10) extending in the front-to-back direction, and the length of the first bottom fence (10) is greater than or equal to the left-right spacing length of the two second side enclosures (4).

3. The deep foundation pit leakage rescue cofferdam according to claim 2, characterized in that: A second connecting fence (18) is provided between upper and lower adjacent second enclosure plates (17) along the front-to-back direction, and the second enclosure plates (17) and the upper and lower adjacent second connecting fences (18) are detachably connected; The bottom of the second enclosing plate (17) at the bottom is detachably connected to the second bottom fence (16), and the front and rear lengths of the second enclosing plate (17) and the second bottom fence (16) are equal.

4. The deep foundation pit water leakage rescue cofferdam according to claim 3, characterized in that: The outer sides of the first connecting fence (12) and the first bottom fence (10) are both provided with rope rings (5), and the rope rings (5) on the first connecting fence (12) and the first bottom fence (10) correspond to the rope rings (5) on the first enclosure plate (11) in a one-to-one vertical manner; The outer sides of the second connecting fence (18) and the second bottom fence (16) are both provided with rope rings (5), and the rope rings (5) on the second connecting fence (18) and the second bottom fence (16) correspond to the rope rings (5) on the second enclosure plate (17) in a one-to-one vertical correspondence.

5. The deep foundation pit leakage rescue cofferdam according to claim 3 or 4, characterized in that: The first side enclosure (3) and the two second side enclosures (4) are both fixedly provided with mounting tubes (8), the mounting tubes (8) being a tubular structure that is transparent from top to bottom, the mounting tube (8) on the first side enclosure (3) being located on the outside of one of the first connecting fences (12), and the mounting tube (8) on the second side enclosure (4) being located on the outside of one of the second connecting fences (18); The diagonal support rod (9) is a telescopic rod structure with adjustable length. The upper end of the diagonal support rod (9) is fixedly connected to a vertically arranged insertion rod (901), and the insertion rod (901) is movably inserted into the installation tube (8).

6. The deep foundation pit leakage rescue cofferdam according to claim 3 or 4, characterized in that: A vertically arranged drill rod (21) is fixedly provided at the bottom of each of the first bottom fence (10) and the second bottom fence (16), and the drill rod (21) is vertically inserted into the bottom of the deep foundation pit.

7. The construction method of the deep foundation pit water leakage rescue cofferdam according to claim 6 is characterized in that: The invention comprises the following construction steps: S1~ firstly splicing the first bottom fence (10) and the second bottom fences (16) on the left and right sides, and making the rear ends of the second bottom fences (16) abut against the underground continuous wall (1), so that the leakage point (2) is located between the two second bottom fences (16) on the left and right sides; S2~ driving the drill rods (21) at the bottom of the first bottom fence (10) and the second bottom fence (16) into the bottom of the deep foundation pit; S3~ On the first bottom fence (10), the first enclosure plate (11) and the first connecting fence (12) are staggered and spliced ​​in sequence from bottom to top, and on the second bottom fence (16), the second enclosure plate (17) and the second connecting fence (18) are staggered and spliced ​​in sequence from bottom to top, and it is ensured that the top of the first enclosure plate (11) is spliced ​​with the first connecting fence (12), and it is ensured that the top of the second enclosure plate (17) is spliced ​​with the second connecting fence (18), thereby forming a first side enclosure (3) and a second side enclosure (4); S4~ Installing diagonal bracing rods (9) on the outside of the first side enclosure (3) and the second side enclosure (4), so that the lower ends of the diagonal bracing rods (9) abut against the bottom of the deep foundation pit; S5~ The upper end of the cable (6) is tied and fixedly connected to the rope ring members (5) on the first side enclosure (3) and the second side enclosure (4), and the lower end of the cable (6) is passed through the first rope rings of the remaining rope ring members (5) in the same row from top to bottom, and then detachably fixedly connected to the anchor rod (7), and the anchor rod (7) is anchored at the bottom of the deep foundation pit.

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