Deep foundation pit supporting structure

Abstract

The invention relates to the technical field of deep foundation pit supporting, and discloses a deep foundation pit supporting structure which comprises a plurality of supporting piles of a cylinder structure at intervals. The multiple steel bars are implanted in the circumferential direction of the supporting pile, the steel bars penetrate through the supporting pile and are inserted into a soil body, the length direction of the steel bars extends in the radial direction of the supporting pile, and the ends, located in the supporting pile, of the steel bars are close to the circle center of the supporting pile; the retaining wall template is fixedly mounted on the support piles; the fixing rods are installed between the supporting piles and the retaining wall formwork, the fixing rods are arranged in the circumferential direction of the supporting piles at intervals, and the length direction of the fixing rods is the same as the radial direction of the supporting piles; and the fixing pieces are mounted on the fixing rods and used for fixedly mounting the supporting piles and the retaining wall formwork together. The overall supporting capacity of the foundation pit can be improved.

Description

Technical Field

[0001] This application relates to the technical field of deep foundation pit support, and particularly to a deep foundation pit support structure. Background Art

[0002] The construction of municipal roads is an important part of urban transportation infrastructure. During the construction of modern municipal roads, it is necessary to excavate a U-shaped groove foundation pit for laying roads. During the excavation and support of the foundation pit, the traditional foundation pit support is a separate design of support piles and retaining walls. Under complex geological conditions, the foundation pit is prone to uneven settlement, and the stability of the foundation pit support structure needs to be improved. Summary of the Invention

[0003] In order to further improve the support effect of the foundation pit, this application provides a deep foundation pit support structure.

[0004] This application provides a deep foundation pit support structure, adopting the following technical solutions: A deep foundation pit support structure includes: Support piles, which are in a cylindrical structure, and a plurality of the support piles are arranged at intervals; Steel bars, multiple steel bars are implanted along the circumferential direction of the support piles, the steel bars pass through the support piles and are inserted into the soil, the length direction of the steel bars extends along the radial direction of the support piles, and one end of the steel bars located inside the support piles is close to the center of the support piles; Retaining wall formwork, which is fixedly installed on the support piles; Fixing rods, which are installed between the support piles and the retaining wall formwork, the fixing rods are arranged at intervals along the circumferential direction of the support piles, and the length direction of the fixing rods is the same as the radial direction of the support piles; Fasteners, which are installed on the fixing rods for fixedly installing the support piles and the retaining wall formwork together.

[0005] By adopting the above technical solutions, during the construction of the support piles, procedures such as burying the casing, drilling, hoisting the steel cage, and underwater concrete pouring are completed to finish the construction of the support piles; procedures such as drilling, hoisting the steel cage, and underwater concrete pouring are completed to finish the construction of the cast-in-place pile row; The steel bars are implanted into the support piles, corresponding holes are drilled according to the distribution of the steel bars, the holes are cleaned, and when installing the steel bars, the steel bars are fixedly installed on the holes with glue or concrete mortar. Multiple steel bars are distributed along the circumferential direction of the holes. Compared with the traditional linear anchoring, the radial distribution can disperse the soil pressure and improve the uplift resistance and anti-overturning ability; When installing the retaining wall formwork, the formwork is directly fixed to the support piles, reducing the independent formwork support procedure and shortening the construction period. When pouring the retaining wall in the formwork, the retaining wall forms an integral structure with the support piles through the fixing rods, which can improve the overall support ability of the foundation pit.

[0006] Optionally, a hollow circular tube is installed inside the retaining pile. The hollow circular tube and the retaining pile are coaxially arranged. There is a gap between the end parts of the steel bars and the fixing rods and the hollow circular tube. A debris collection mechanism for collecting debris is detachably installed inside the hollow circular tube.

[0007] By adopting the above technical solution, during the construction of the retaining pile, after burying the casing, drilling, hoisting the steel reinforcement cage, and installing the hollow circular tube, the concrete pouring process is carried out. During the pouring process, the hollow circular tube is located at the center position of the retaining pile. When drilling, the drill pipe will pass through the hollow circular tube. The hollow circular tube can serve as a temporary function for debris collection and transfer. When drilling and cleaning the hole, the debris falling into the hollow circular tube is collected by the debris collection mechanism. The debris collection mechanism that can be detached from the hollow circular tube can collect the debris and remove it outside the hollow circular tube.

[0008] Optionally, the debris collection mechanism includes: A receiving plate, which is slidably installed inside the hollow circular tube, A connecting rod, which is connected to the receiving plate and is used to control the movement of the receiving plate, A sealing ring, which is installed on the connecting rod and is located above the receiving plate. First drill holes for inserting the steel bars and second drill holes for inserting the fixing rods are circumferentially distributed inside the hollow circular tube. The first drill holes and the second drill holes correspond one by one, and the corresponding first drill holes and second drill holes are coaxial. Two relief holes are opened on the sealing ring, and the two relief holes of the sealing ring are respectively communicated with the first drill hole and the second drill hole.

[0009] By adopting the above technical solution, the debris falling into the hollow circular tube accumulates on the receiving plate. The sealing ring can simultaneously communicate with one first drill hole and one second drill hole, and cover the other first drill holes and second drill holes. The second drill hole facilitates the entry of compressed gas or pressurized water into the first drill hole for hole cleaning. When drilling and cleaning the hole, the debris will not enter the drilled holes that have been cleaned, and the operations of unified drilling and unified hole cleaning can be realized, improving the drilling and hole cleaning efficiency.

[0010] Optionally, a collection bag is installed on the receiving plate.

[0011] By adopting the above technical solution, the collection bag expands the slag storage space and is suitable for the large amount of residue generated by multiple drillings in deep foundation pits.

[0012] Optionally, the opening of the collection bag faces upward. The edge of the opening of the collection bag is connected with a shaping ring. The shaping ring is made of a flexible material. The shaping ring contacts the inner wall of the hollow circular tube, and the shaping ring is located between the sealing ring and the receiving plate.

[0013] By adopting the above technical solution, the flexible sizing ring is in close contact with the inner wall of the circular pipe, preventing residues from seeping into the interior of the retaining pile through the gaps.

[0014] Optionally, a reducing flow guide ring is installed on the sizing ring, and the outer diameter of the end of the flow guide ring close to the sizing ring is the largest.

[0015] By adopting the above technical solution, the reducing flow guide ring cooperates with the collection bag to form a funnel effect.

[0016] Optionally, the flow guide ring is made of a flexible material. The connecting rod is rotatably installed on the receiving plate. A push rod is installed on the connecting rod. One end of the push rod extends between the flow guide ring and the collection bag, and the push rod contacts the flow guide ring as the connecting rod rotates.

[0017] By adopting the above technical solution, the rotational resistance of the push rod changes with the height of the residue accumulation, and the construction personnel can judge whether cleaning is required through the operating feel.

[0018] Optionally, a water extraction pipe is inserted into the connecting rod, and a water inlet hole is provided on the rod wall of the connecting rod.

[0019] By adopting the above technical solution, when clearing the hole in the drilling, when using compressed air to clear the hole and the method of air-water mixing for the situation, it is necessary to timely extract the accumulated water in the hollow circular pipe.

[0020] Optionally, it further includes a positioning plate fixedly installed on the retaining pile. The positioning plate is provided with an arc-shaped groove for fitting with the surface of the retaining pile and a flat part for fitting with the retaining wall formwork. The fixing rod is provided with a through hole for the fixing rod to pass through, and the through hole corresponds to the second drilling hole one by one, and a plurality of the through holes are located on different planes.

[0021] By adopting the above technical solution, the distribution of the through holes of the positioning plate can directly provide the drilling positions of the first drilling hole and the second drilling hole, improving the drilling efficiency. When installing the retaining wall formwork, the arc-shaped groove fits the surface of the retaining pile, and the flat part presses the retaining wall formwork, which can ensure that the retaining wall formwork and the retaining pile can be stably connected together.

[0022] Optionally, the fixing piece is a nut. After the fixing rod passes through the retaining wall formwork, the fixing rod is threadedly connected with the nut.

[0023] By adopting the above technical solution, after all the steel bars and the fixing rods are installed, concrete mortar is poured into the hollow circular pipe. After the concrete mortar solidifies, one end of the fixing rod is fixed on the retaining pile. After the retaining wall solidifies, the other end of the fixing rod is fixed in the retaining wall, thereby realizing the integrated setting of the retaining pile and the retaining wall and improving the firmness of the foundation pit support.

[0024] In summary, the present application includes at least one of the following beneficial effects: 1. By implanting steel bars along the circumferential direction of the retaining pile and inserting them through the retaining pile into the soil, the radial distribution of the steel bars can more effectively disperse the earth pressure, thereby improving the uplift resistance and anti-overturning ability of the retaining structure. Compared with the traditional straight anchoring method, this design can significantly enhance the stability of the retaining structure under complex geological conditions; 2. By installing fixing rods between the retaining pile and the retaining wall formwork and using fixing parts to fixedly install the two together, the retaining wall can form an integral structure with the retaining pile during pouring. This design not only reduces the process of independent formwork support, shortens the construction period, but also improves the overall retaining ability of the foundation pit through the connection between the fixing rods and the retaining pile. At the same time, the hollow circular pipe and its aggregate mechanism installed in the retaining pile can act as a temporary debris collection and transfer function during the construction process, further improving the construction efficiency and quality. Description of the Drawings

[0025] Figure 1 is a schematic diagram of the overall structure of the arrangement of retaining piles in an embodiment of the present application; Figure 2 is a cross-sectional view showing the installation of steel bars in the retaining pile in an embodiment of the present application; Figure 3 is a cross-sectional view showing the steel bars arranged at intervals along the height direction of the retaining pile in an embodiment of the present application; Figure 4 is a cross-sectional view showing the aggregate mechanism located in the hollow circular pipe in an embodiment of the present application; Figure 5 is a cross-sectional view of the overall structure of the aggregate mechanism in an embodiment of the present application; Figure 6 is a schematic diagram showing the structure of the plugging ring plugging part of the first drilling hole and the second drilling hole in an embodiment of the present application; Figure 7 is a schematic diagram showing the structure of the retaining wall formwork installed on the retaining pile through the fixing rod in an embodiment of the present application.

[0026] Description of the Reference Numerals: 100, retaining pile; 200, steel bar; 300, retaining wall formwork; 400, hollow circular pipe; 410, first drilling hole; 420, second drilling hole; 500, capping beam; 600, positioning plate; 610, arc groove; 620, through hole; 630, flat part; 700, aggregate mechanism; 710, receiving plate; 720, connecting rod; 721, water inlet hole; 722, push rod; 730, plugging ring; 731, relief hole; 732, ball; 733, compression spring; 740, collection bag; 741, shaping ring; 742, diversion ring; 750, water extraction pipe; 900, fixing rod; 910, nut. Detailed Embodiments

[0027] The following further elaborates on this application in conjunction with the accompanying drawings. Figures 1 - 7 A further detailed description of this application will be given below.

[0028] An embodiment of this application discloses a deep foundation pit support structure. Referring to Figure 1 , a deep foundation pit support structure includes support piles 100. The support piles 100 are distributed along the foundation pit and are arranged at intervals. The support piles 100 are in a cylindrical structure. A hollow circular tube 400 is coaxially placed inside the support piles 100. A capping beam 500 is cast at the tops of multiple support piles 100. During the specific construction of the support piles 100, first, the casing is buried, the hole is drilled, the steel reinforcement cage is hoisted, the hollow circular tube 400 is placed, and the underwater concrete pouring process is carried out, so as to complete the installation of the hollow circular tube 400 and the casting of the support piles 100. The hollow circular tube 400 also extends outside the capping beam 500.

[0029] Referring to Figure 2 and Figure 3 , before pouring the retaining wall, steel bars 200 are inserted between the support piles 100 and the soil mass. Multiple steel bars 200 are implanted at the same horizontal plane along the circumferential direction of the support piles 100, and multiple layers of steel bars 200 are arranged in the height direction of the support piles 100. Multiple steel bars 200 at the same horizontal plane extend along the length direction of the support piles 100, and an included angle of 30° is formed between adjacent two steel bars 200. The steel bars 200 are fixed by injecting glue, and the end of the steel bar 200 located inside the support pile 100 does not insert into the hollow circular tube 400.

[0030] Referring to Figure 1 and Figure 2, before implanting the steel bars 200 into the retaining pile 100, drilling and hole cleaning are required. In order to accurately determine the drilling position, a positioning plate 600 is fixedly installed on the retaining pile 100. The positioning plate 600 is provided with an arc-shaped groove 610 for fitting with the retaining pile 100. The arc-shaped groove 610 of the positioning plate 600 is a semi-circular groove structure, and the central axis of the arc-shaped groove 610 coincides with the central axis of the retaining pile 100. When installing the positioning plate 600, half of the retaining pile 100 is exposed outside the soil body. The positioning plate 600 is fixedly installed on the retaining pile 100 through expansion bolts, and the positioning plate 600 and the retaining pile 100 are coaxial. According to the drawing, five steel bars 200 are installed circumferentially on the retaining pile 100. Therefore, five drill holes for installing the steel bars 200 need to be drilled. Five through holes 620 are opened on the positioning plate 600. The five through holes 620 are arranged at intervals along the arc direction of the arc-shaped groove 610. There is an included angle of 30° between adjacent two through holes 620. The through holes 620 extend along the radial direction of the retaining pile 100. The positioning plate 600 corresponds to each layer of steel bars 200 one by one. The drilling equipment drills the retaining pile 100 with reference to the positions of the through holes 620. The drill rod will continue to drill after passing through the hollow round tube 400. When the drill rod drills the soil body to a certain depth, the drilling stops. After the drilling is completed, a first drill hole 410 for inserting the steel bar 200 is circumferentially distributed inside the hollow round tube 400, and a second drill hole 420 communicating with the through hole 620. The number of the first drill holes 410 and the second drill holes 420 is equal, and the first drill holes 410 and the second drill holes 420 correspond to each other one by one and are coaxial.

[0031] Refer to Figure 4 , during the drilling and hole cleaning process, debris will appear. In order to reduce the accumulation of debris in the hollow round tube 400, a debris collection mechanism 700 for collecting debris is detachably installed inside the hollow round tube 400. The debris collection mechanism 700 includes a receiving plate 710 slidably installed inside the hollow round tube 400, a connecting rod 720 for connecting with the receiving plate 710, and a sealing ring 730 installed on the connecting rod 720. The receiving plate 710 is used to receive the debris. One end of the connecting rod 720 is connected to the receiving plate 710, and the other end of the connecting rod 720 extends outside the hollow round tube 400.

[0032] Refer to Figure 5 , during hole cleaning, in order to clean each drill hole one by one, the sealing ring 730 is slidably installed inside the hollow round tube 400. Two relief holes 731 are opened on the sealing ring 730. The two relief holes 731 are respectively communicated with a first drill hole 410 and the corresponding second drill hole 420. The remaining first drill holes 410 and second drill holes 420 are temporarily blocked by the sealing ring 730. When the sealing ring 730 is communicated with the corresponding first drill hole 410 and second drill hole 420, the receiving plate 710 is located above the sealing ring 730.

[0033] Refer to Figure 6, the outer wall of the plugging ring 730 is embedded in the ball 732 and the compression spring 733. One end of the compression spring 733 is fixedly connected to the plugging ring 730, and the other end of the compression spring 733 abuts against the ball 732. When the plugging ring 730 contacts the inner wall of the hollow circular tube 400, all the balls 732 are located inside the plugging ring 730. When the ball 732 encounters the first drill hole 410 or the second drill hole 420, part of the ball 732 extends out of the plugging ring 730. The cooperation of the ball 732 and the compression spring 733 can position the plugging ring 730, which is convenient for determining whether the plugging ring 730 is installed in place.

[0034] Refer to Figure 5 , when clearing the hole, compressed gas and high-pressure water are used to clean the drill hole at the same time. A lot of debris and muddy water flow into the hollow circular tube 400, and the receiving plate 710 intercepts and collects the debris and muddy water. In order to better collect the debris and muddy water, and when the aggregate mechanism 700 leaves the hollow circular tube 400, the debris and muddy water will not flow back into the first drill hole 410 and the second drill hole 420. A collection bag 740 is installed on the receiving plate 710. The collection bag 740 can be made of plastic cloth material and has a certain deformation ability.

[0035] Specifically, the opening of the collection bag 740 faces upward. The bottom of the collection bag 740 contacts the receiving plate 710. The opening edge of the collection bag 740 is connected with a shaping ring 741. The shaping ring 741 is made of flexible material. The shaping ring 741 keeps the collection bag 740 with the opening facing upward and stably attached to the inner wall of the hollow circular tube 400. When the connecting rod 720 is pulled and the receiving plate 710 and the plugging ring 730 move upward together, the shaping ring 741 keeps close to the circular tube. As long as the debris and accumulated water do not submerge the shaping ring 741, the debris and accumulated water will not enter the first drill hole 410 and the second drill hole 420.

[0036] Refer to Figure 5 , a water extraction pipe 750 is arranged inside the connecting rod 720, and a water inlet hole 721 is arranged on the rod wall of the connecting rod 720. The muddy water is filtered and enters the connecting rod 720, and is taken out by the water extraction pipe 750, which prolongs the time of the collection bag 740 in the hollow circular tube 400.

[0037] A variable-diameter diversion ring 742 is installed on the shaping ring 741. The diversion ring 742 has openings at both ends. The outer diameter of the end of the diversion ring 742 close to the shaping ring 741 is the largest. The diversion ring 742 can play a certain role in guiding the debris and muddy water. The material of the diversion ring 742 is made of plastic cloth material.

[0038] Refer to Figure 5, since the aggregate mechanism 700 is inside the hollow circular pipe 400, it is not convenient to check the collection situation in the collection bag 740 at any time during the hole cleaning process. Since the diversion ring 742 is close to the mouth of the collection bag 740, a push rod 722 is installed on the connecting rod 720. The push rod 722 is in an L-shaped structure. One end of the push rod 722 is connected to the connecting rod 720, and the other end of the push rod 722 extends between the diversion ring 742 and the collection bag 740. The push rod 722 contacts the diversion ring 742 along with the rotation of the connecting rod 720. If the debris in the collection bag 740 fills up to the diversion ring 742, when the connecting rod 720 rotates, the push rod 722 is blocked by the slag, affecting the smooth rotation of the connecting rod 720. The cooperation between the push rod 722 and the diversion ring 742 is used to feedback whether it is necessary to clean the slag and muddy water in the collection bag 740. The connecting rod 720 and the receiving plate 710 are rotatably connected through a bearing, and a sealing ring is arranged on the outer periphery of the bearing to reduce the entry of sediment into the bearing. When the connecting rod 720 rotates, the drill pipe has withdrawn from the drill hole. However, in order not to affect the drill pipe of the drilling rig to drill, the part of the drill pipe close to the plugging ring 730 is bent to make way for the drill pipe.

[0039] Refer to Figure 7 , after the drill hole is cleaned, the steel bars 200 are installed. Finally, the retaining wall formwork 300 is installed, and the retaining wall is poured between the retaining wall formwork 300 and the retaining pile 100. The positioning plate 600 is provided with a flat part 630 for fitting with the retaining wall. A fixing rod 900 is installed between the retaining wall formwork 300 and the retaining pile 100. One end of the fixing rod 900 is inserted into the through hole 620 and the second drill hole 420, so the fixing rods 900 are arranged at intervals along the circumferential direction of the retaining pile 100, and the length direction of the fixing rods 900 is also the same as the radial direction of the retaining pile 100. One end part of the fixing rod 900 extends into the hollow circular pipe 400, and the other end of the fixing rod 900 passes through the retaining wall formwork 300 and is fixed to the retaining wall formwork 300 through a fixing member.

[0040] The fixing rods 900 are distributed in multiple layers along the height direction of the retaining pile 100. When the fixing rods 900 in the same vertical multiple layers are all inserted into the hollow circular pipe 400 and concrete is poured into the hollow circular pipe 400, after the concrete solidifies, one end of the fixing rod 900 is fixed on the retaining pile 100. The fixing member is a nut 910. After the fixing rod 900 passes through the retaining wall formwork 300, the fixing rod 900 is threadedly connected with the nut 910. In order to facilitate the nut 910 to abut against the retaining wall formwork 300, a cushion block is inserted through the fixing rod 900, the cushion block fits on the retaining wall formwork 300, and the nut 910 abuts against the cushion block. After the retaining wall is poured, whether the retaining wall formwork 300 is removed or not, the fixing rod 900 and the positioning plate 600 are fixedly installed between the retaining wall and the retaining pile 100, improving the connection relationship between the retaining wall and the retaining pile 100.

[0041] The implementation principle of a deep foundation pit support structure in an embodiment of the present application is as follows: By arranging the support piles 100 at intervals, multiple steel bars 200 passing through the support piles 100 and inserted into the soil are implanted along the circumferential direction of the support piles 100. The radial distribution of the steel bars 200 is used to disperse the soil pressure and improve the uplift resistance and anti-overturning ability. The retaining wall formwork 300 is fixedly installed on the support piles 100. Fixing rods 900 arranged at intervals along the circumferential direction of the support piles 100 and having the same length direction as the radial direction of the support piles 100 are installed between the support piles 100 and the retaining wall formwork 300. The support piles 100 and the retaining wall formwork 300 are fixedly installed together by means of fixing parts to form an integrated structure, improving the overall support ability of the foundation pit. At the same time, a coaxial hollow circular tube 400 is installed inside the support pile 100, and an aggregate mechanism 700 is detachably installed therein. During the construction drilling and hole cleaning of the support pile 100, the aggregate mechanism 700 collects the debris falling into the hollow circular tube 400 during drilling, and the sealing ring 730 in the aggregate mechanism 700 can communicate with the corresponding drill hole to prevent the debris from entering the cleaned drill hole, realizing unified drilling and hole cleaning operations and improving the construction efficiency.

[0042] The above are all the preferred embodiments of the present application, and the protection scope of the present application is not limited thereby. Therefore, all equivalent changes made according to the structure, shape, and principle of the present application should be covered within the protection scope of the present application.

Claims

1. A deep foundation pit support structure, characterized in that, it includes: Support piles (100), which are in a cylindrical structure, and a plurality of the support piles (100) are arranged at intervals; Steel bars (200), multiple steel bars (200) are implanted along the circumferential direction of the support piles (100), the steel bars (200) pass through the support piles (100) and are inserted into the soil body, the length direction of the steel bars (200) extends along the radial direction of the support piles (100), and one end of the steel bars (200) located inside the support piles (100) is close to the center of the support piles (100); Retaining wall formwork (300), which is fixedly installed on the support piles (100); Fixing rods (900), which are installed between the support piles (100) and the retaining wall formwork (300), the fixing rods (900) are arranged at intervals along the circumferential direction of the support piles (100), and the length direction of the fixing rods (900) is the same as the radial direction of the support piles (100); Fixing pieces, which are installed on the fixing rods (900) for fixedly installing the support piles (100) and the retaining wall formwork (300) together.

2. A deep foundation pit support structure according to claim 1, characterized in that, A hollow circular tube (400) is installed inside the support pile (100), the hollow circular tube (400) is coaxially arranged with the support pile (100), there is a spacing between the ends of the steel bars (200) and the fixing rods (900) and the hollow circular tube (400), and a collecting mechanism (700) for collecting debris is detachably installed inside the hollow circular tube (400).

3. A deep foundation pit support structure according to claim 2, characterized in that, The collecting mechanism (700) includes: A receiving plate (710), which is slidably installed inside the hollow circular tube (400), A connecting rod (720), which is connected to the receiving plate (710) for controlling the movement of the receiving plate (710), A sealing ring (730), which is installed on the connecting rod (720) and is located above the receiving plate (710). The inner circumference of the hollow circular tube (400) is circumferentially distributed with first drill holes (410) for inserting the steel bars (200) and second drill holes (420) for inserting the fixing rods (900). The first drill holes (410) and the second drill holes (420) are in one-to-one correspondence, and the corresponding first drill holes (410) and the second drill holes (420) are coaxial. The sealing ring (730) is provided with two relief holes (731), and the two relief holes (731) of the sealing ring (730) are respectively communicated with the first drill hole (410) and the second drill hole (420).

4. A deep foundation pit support structure according to claim 3, characterized in that, A collecting bag (740) is installed on the receiving plate (710).

5. A deep foundation pit support structure according to claim 4, characterized in that, The collecting bag (740) is opened upwards, and a shaping ring (741) is connected to the edge of the opening of the collecting bag (740). The shaping ring (741) is made of a flexible material, and is in contact with the inner wall of the hollow circular tube (400). The shaping ring (741) is located between the sealing ring (730) and the receiving plate (710).

6. A deep foundation pit support structure according to claim 5, It is characterized in that A guide ring (742) with a variable diameter is mounted on the shaping ring (741); the guide ring (742) has the largest outer diameter at one end close to the shaping ring (741).

7. A deep foundation pit support structure according to claim 6, It is characterized in that The guide ring (742) is made of a flexible material. The connecting rod (720) is rotatably mounted on the receiving plate (710). A push rod (722) is mounted on the connecting rod (720). One end of the push rod (722) extends between the guide ring (742) and the collecting bag (740). The push rod (722) rotates with the connecting rod (720) and contacts the guide ring (742).

8. A deep foundation pit support structure according to claim 3, It is characterized in that A water pumping pipe (750) is inserted into the connecting rod (720), and a water inlet hole (721) is opened on the wall of the connecting rod (720).

9. A deep foundation pit support structure according to claim 3, It is characterized in that It also includes a positioning plate (600) fixedly mounted on the supporting pile (100), the positioning plate (600) being provided with an arc groove (610) for fitting with the surface of the supporting pile (100), and a plane portion (630) for fitting with the retaining wall formwork (300), the fixing rod (900) being provided with a through hole (620) for the fixing rod (900) to pass through, the through hole (620) corresponding to the second bore hole (420) one by one, and a plurality of the through holes (620) being located on different planes.

10. A deep foundation pit support structure according to claim 9, It is characterized in that The fixing member is a nut (910), and after the fixing rod (900) passes through the retaining wall formwork (300), the fixing rod (900) and the nut (910) are threadedly connected.

Images