Vacuum preloading combined with cement mixing wall

Abstract

The utility model relates to the technical field of ground treatment discloses a kind of vacuum preloading combined cement mixing wall, including ground, the mixing pile is arranged in the ground, the ground upper surface is provided with sealing membrane, the sealing membrane upper surface is provided with vertical branch pipe, the lateral wall of vertical branch pipe is fixedly connected with horizontal main pipe, the lateral wall of horizontal main pipe is provided with valve, the ground upper surface is provided with vacuum pump, the output end of vacuum pump is fixedly connected in the one end of horizontal main pipe, the ground is provided with drainage assembly inside, the lateral wall of mixing pile is provided with reinforcing component.In the utility model, the sealing curtain is formed by the grid-like mixing pile, and is matched with the annular reinforcing rib, combined with the drainage plate and the networked vacuum pipeline system, the synergistic effect of horizontal main pipe and vertical branch pipe makes the ground realize efficient drainage consolidation under stable negative pressure environment, and the overall quality and construction efficiency of soft soil ground treatment are improved by the above structure.

Description

Technical Field

[0001] This utility model relates to the field of foundation treatment technology, and in particular to a vacuum preloading combined with cement mixing wall. Background Technology

[0002] In civil engineering, transportation engineering, and other fields, the treatment of soft soil foundations is a crucial step in ensuring the safety and stability of engineering structures. Soft soil foundations are typically characterized by high water content, large void ratio, low bearing capacity, and high compressibility. If not effectively treated, they can easily lead to excessive or uneven settlement of buildings, roads, bridges, and other structures, seriously affecting the quality and service life of the project.

[0003] In existing technologies, the treatment of soft soil foundations often employs either a single vacuum preloading method or a cement mixing pile method. The single vacuum preloading method typically involves laying a sand cushion layer on the surface of the soft soil foundation, installing vertical drainage bodies (such as plastic drainage boards), and then covering it with a sealing membrane. A vacuum pump is used to create negative pressure, prompting the drainage of pore water in the foundation and achieving soil consolidation. Its technical principle mainly utilizes atmospheric pressure as a preloading load, accelerating soil drainage and consolidation through drainage channels. The single cement mixing pile method, on the other hand, uses deep mixing machinery to forcibly mix cement and other solidifying agents with the foundation soil, forming cement-soil piles. The chemical reaction between the solidifying agent and the soil improves the strength and stability of the foundation soil. Its technical principle is based on the cementing effect of the solidifying agent, which hardens the soft soil.

[0004] However, in the existing single vacuum preloading method, due to the lack of an effective sealing structure, the sealing performance is prone to insufficient, making it difficult to maintain a stable vacuum degree. At the same time, the layout of the drainage system is not reasonable enough, resulting in uneven drainage of water in the foundation soil, which in turn leads to low consolidation efficiency and unstable foundation strength improvement, making it difficult to meet the high standards required for foundation treatment in engineering. Therefore, a vacuum preloading combined with cement mixing wall is proposed to solve the above problems. Utility Model Content

[0005] To overcome the above deficiencies, this utility model provides a vacuum preloading combined with cement mixing wall to improve the problems of low consolidation efficiency and unstable foundation strength improvement caused by insufficient sealing and uneven drainage in the treatment of soft soil foundations in the prior art.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A vacuum preloading combined cement mixing wall includes a foundation, mixing piles are installed inside the foundation, a sealing membrane is installed on the upper surface of the foundation, vertical branch pipes are installed on the upper surface of the sealing membrane, horizontal main pipes are fixedly connected to the top of the vertical branch pipes, a manifold is installed on the upper surface of the foundation, multiple horizontal main pipes are connected to the manifold, valves are installed on the sidewalls of the manifold, a vacuum pump is installed on the upper surface of the foundation, the output end of the vacuum pump is fixedly connected to one end of the manifold, and a drainage assembly is installed inside the foundation.

[0008] The drainage assembly includes a drainage board, which is fixedly connected to the foundation. One end of the vertical branch pipe passes through the sealing membrane and is connected to the drainage board. The drainage board has a guide edge extending outward from its edge, and the guide edge has water-permeable holes. The drainage board has multiple reinforcing ridges fixedly connected to its sidewall, and the drainage board has a guide channel inside.

[0009] In a further technical solution, multiple mixing piles are interconnected to form a grid-like wall unit, and a drainage blind ditch is set within the grid formed by the multiple mixing piles, and the drainage blind ditch is connected to the end of the drainage board.

[0010] In a further technical solution, the top of the drainage board extends beyond the foundation surface by a predetermined length and is connected to the vertical branch pipe through a tee connector. The inclination angle of the guide side is 25° to 35°, and the guide channel is connected to the permeable hole.

[0011] In a further technical solution, an annular steel pressure strip is provided on the upper surface of the sealing membrane, the edge of the sealing membrane is connected to the top of the mixing pile through the annular steel pressure strip, a lower elevation seat is fixedly connected to the bottom of the mixing pile, an upper elevation seat is fixedly connected to the contact edge between the mixing pile and the foundation, a groove is opened inside the upper elevation seat, and a water-swellable waterstop strip is provided inside the upper elevation seat, the water-swellable waterstop strip is located inside the groove.

[0012] In a further technical solution, the sealing membrane has a double-layer composite structure, with the lower layer being a polyethylene geomembrane and the upper layer being a non-woven fabric protective layer.

[0013] In a further technical solution, the sidewall of the mixing pile is provided with a reinforcement component, the reinforcement component includes annular reinforcing ribs, the annular reinforcing ribs are located on the sidewall of the mixing pile, the annular reinforcing ribs are segmented structures, each annular reinforcing rib sidewall is fixedly connected with a locking block, the locking block sidewall is slidably connected inside the adjacent annular reinforcing ribs, and the annular reinforcing ribs are connected to each other by bolts.

[0014] In a further technical solution, the outer ring of the annular reinforcing rib is fixedly connected with triangular cone-shaped anchoring teeth, the inner ring of the annular reinforcing rib is fixedly connected with radial ribs, the annular reinforcing rib has through holes inside, and the triangular cone-shaped anchoring teeth are inclined at 45° to form a mechanical interlock with the surrounding cement and soil.

[0015] In a further technical solution, a pressure sensor is installed inside the transverse main tube.

[0016] This utility model has the following beneficial effects:

[0017] In this vacuum preloading combined with cement mixing wall, the mixing piles serve as the core structure, forming a sealed curtain through a grid-like arrangement to block external water replenishment. The sealing membrane, in conjunction with the mixing piles, forms a closed space, ensuring the stability of the negative pressure transmitted by the vacuum pump through the horizontal main pipe and vertical branch pipes, thus solving the problem of unstable negative pressure caused by insufficient sealing performance in traditional vacuum preloading methods. In the drainage component, the guide edges and permeable holes of the drainage board can efficiently collect pore water in the foundation, the guide channel enables rapid water transport, and the reinforced ridges prevent the drainage board from deforming under pressure. Combined with the networked vertical branch pipes and horizontal main pipes, the drainage efficiency is greatly improved and drainage blind spots are reduced. The overall structure, through the synergistic effect of efficient drainage from the vacuum preloading system and deformation restraint by the mixing piles, can accelerate the pore compression of the foundation soil, improve the foundation strength, ensure uniform consolidation, shorten the treatment cycle, and ultimately effectively improve the bearing capacity of the foundation, meeting the engineering requirements for foundation stability.

[0018] In this invention, a sealed curtain is formed by grid-shaped mixing piles, and the overall structure is enhanced by ring-shaped reinforcing ribs. Combined with drainage boards and a networked vacuum pipeline system, the synergistic effect of the horizontal main pipes and vertical branch pipes enables the foundation to achieve efficient drainage and consolidation under a stable negative pressure environment. This achieves the effect of rapidly improving the bearing capacity of the foundation and reducing subsequent settlement, solving the problems of low consolidation efficiency and unstable foundation strength improvement caused by insufficient sealing and uneven drainage in existing soft soil foundation treatments. The above structure improves the overall quality and construction efficiency of soft soil foundation treatment. Attached Figure Description

[0019] Figure 1 This is a three-dimensional schematic diagram of a vacuum pre-compressed cement mixing wall proposed in this utility model;

[0020] Figure 2 This is a schematic diagram of the top structure of a vacuum pre-compressed cement mixing wall proposed in this utility model;

[0021] Figure 3 This is a side view of a vacuum pre-compressed cement mixing wall proposed in this utility model.

[0022] Figure 4This is a schematic diagram of the drainage component of a vacuum pre-compressed cement mixing wall proposed in this utility model;

[0023] Figure 5 This is a schematic diagram of the structure of a mixing pile for a vacuum preloading combined cement mixing wall proposed in this utility model;

[0024] Figure 6 This is a structural schematic diagram of a reinforcement component for a vacuum preloading combined cement mixing wall proposed in this utility model.

[0025] Legend:

[0026] 1. Foundation; 2. Mixing pile; 3. Drainage board; 4. Sealing membrane; 5. Vertical branch pipe; 6. Horizontal main pipe; 7. Valve; 8. Vacuum pump; 9. Guide edge; 10. Water-permeable hole; 11. Reinforcing ridge; 12. Guide channel; 13. Upper elevation seat; 14. Water-swellable waterstop strip; 15. Annular steel pressure strip; 16. Annular reinforcing rib; 17. Triangular pyramidal anchor teeth; 18. Radial ribs; 19. Locking block; 20. Through hole; 21. Lower elevation seat; 22. Manifold. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0028] like Figures 1 to 4 As shown, this utility model provides a vacuum preloading combined cement mixing wall, including a foundation 1, a mixing pile 2 inside the foundation 1, a sealing membrane 4 on the upper surface of the foundation 1, a vertical branch pipe 5 on the upper surface of the sealing membrane 4, a horizontal main pipe 6 fixedly connected to the top of the vertical branch pipe 5, a manifold 22 on the upper surface of the foundation 1, multiple horizontal main pipes 6 connected to the manifold 22, a valve 7 on the side wall of the manifold 22, a vacuum pump 8 on the upper surface of the foundation 1, the output end of the vacuum pump 8 fixedly connected to one end of the manifold 22, and a drainage assembly inside the foundation 1;

[0029] The drainage assembly includes a drainage board 3, which is fixedly connected inside the foundation 1. One end of the vertical branch pipe 5 passes through the sealing membrane 4 and is connected to the drainage board 3. The drainage board 3 has a guide edge 9 extending outward from its edge. The guide edge 9 has a water-permeable hole 10 inside. The side wall of the drainage board 3 is fixedly connected with multiple reinforcing ridges 11. The drainage board 3 has a guide channel 12 inside.

[0030] Among them, the mixing pile 2 is used to form a grid-like sealing curtain, which plays the role of preventing seepage and restraining the deformation of the foundation 1. The horizontal main pipe 6 is used to collect the water from each vertical branch pipe 5. The valve 7 is used to control the opening and closing of the horizontal main pipe 6. The vacuum pump 8 is used to extract air in the enclosed space to form negative pressure, which provides a power effect for the drainage and consolidation of the foundation 1. The drainage component is used to collect and discharge pore water in the foundation 1, accelerating the soil consolidation effect.

[0031] like Figure 3 As shown, the drainage assembly includes a drainage plate 3, which is fixedly connected inside the foundation 1. The drainage plate 3 serves as a vertical drainage channel to collect moisture in the foundation 1 and transport it upwards. One end of the vertical branch pipe 5 passes through the sealing membrane 4 and is connected to the drainage plate 3. The vertical branch pipe 5 works with the drainage plate 3 to transport moisture, achieving the effect of exporting deep moisture from the foundation 1 to the vacuum system.

[0032] like Figure 4 As shown, the drainage board 3 has a guide edge 9 extending outward from its edge. The guide edge 9 is used to increase the contact area between the drainage board 3 and the soil of the foundation 1, guiding the surrounding water to converge towards the permeable holes 10. The guide edge 9 has permeable holes 10 inside, which allow water from the foundation 1 to enter the drainage board 3, providing an inlet for water transmission. The drainage board 3 has multiple reinforcing ridges 11 fixedly connected to its side wall. The reinforcing ridges 11 are used to enhance the structural rigidity of the drainage board 3 and prevent it from deforming when inserted into the foundation 1 or under negative pressure. The drainage board 3 has a guide channel 12 inside, which is used to transport the water collected by the permeable holes 10 upward, forming a smooth drainage path.

[0033] Multiple mixing piles 2 are interlocked to form a grid-like wall unit. This grid structure divides the foundation treatment area 1 into independent grids, making the consolidation effect within each grid more uniform and enhancing the overall seepage prevention performance. Drainage blind ditches are installed within the grid-like grid formed by the multiple mixing piles 2, and these drainage blind ditches are connected to the ends of drainage boards 3. The drainage blind ditches, in conjunction with the drainage boards 3, collect deep-seated moisture, thereby expanding the drainage range and avoiding drainage blind spots. The cement mixing wall structure can be constructed using a four-axis deep mixing machine. Each mixing pile 2 has a diameter of 900mm, and the overlap length between two adjacent piles is 200mm, forming a 1600mm wide wall unit. The overlapping wall unit ensures the continuity and sealing of the mixing wall, preventing external moisture from seeping into the treatment area.

[0034] The method of achieving pile overlap is to use equipment such as a quadrilateral deep mixer to control the construction trajectory of adjacent single-axis piles (e.g., piles with a diameter of 900mm) with precise positioning technology, so that the piles form a set overlap length (e.g., 200mm) in the horizontal direction. In the grid-like layout, longitudinal and transverse piles are arranged in an intersecting manner. With the help of the geometric characteristics of the cylindrical cross section, a continuous grid connection on the plane is constructed by overlapping the edges of the piles in the longitudinal and transverse directions. At the same time, the verticality of the piles, the pile depth, and the quality of cement-soil mixing are strictly controlled during construction to ensure that the piles overlap continuously in the vertical direction. Finally, the dispersed columnar piles form a seamless continuous structure through horizontal overlap, longitudinal and transverse interweaving, and vertical continuity, providing physical support for the sealing curtain.

[0035] The drainage boards 3 can be arranged in a quincunx pattern, with a horizontal spacing of 1.2m between adjacent drainage boards 3. The quincunx pattern arrangement is used to ensure that the drainage boards 3 are evenly distributed in the foundation 1, ensuring consistent drainage efficiency in each area. The top of the drainage board 3 extends beyond the surface of the foundation 1 by a predetermined length, for example, 30cm, and is connected to the vertical branch pipe 5 through a T-joint. The T-joint is used to connect the drainage board 3 to the vertical branch pipe 5, which reduces the number of pipe joints and reduces vacuum pressure loss. The guide edge 9 has an inclination angle of 25° to 35°, for example, 30°. The 30° inclination angle is used to optimize the water flow path, reduce water flow resistance, and accelerate the speed at which water flows into the permeable hole 10. The guide channel 12 is connected to the permeable hole 10, and the guide channel 12 works with the permeable hole 10 to transport water, achieving the effect of forming an integrated drainage path for collection and transportation.

[0036] like Figure 1 and Figure 3 As shown, an annular steel strip 15 is provided on the upper surface of the sealing membrane 4. The annular steel strip 15 is used to press the edge of the sealing membrane 4 tightly against the top of the mixing pile 2, thereby enhancing the sealing effect of the connection between the sealing membrane 4 and the mixing wall. The edge of the sealing membrane 4 is connected to the top of the mixing pile 2 through the annular steel strip 15. The annular steel strip 15 works with the sealing membrane 4 to form a sealed connection with the mixing pile 2, achieving the effect of replacing the traditional sealing trench and simplifying the construction process.

[0037] like Figure 5As shown, a lower elevation seat 21 is fixedly connected to the bottom of the mixing pile 2. The lower elevation seat 21 is used to make the bottom of the mixing pile 2 penetrate into a more stable stratum, thereby improving its pull-out resistance and bearing capacity. An upper elevation seat 13 is fixedly connected to the contact edge between the mixing pile 2 and the foundation 1. The upper elevation seat 13 is used to provide a connection base for the sealing membrane 4, while ensuring the structural strength of the top of the mixing pile 2. A groove is opened inside the upper elevation seat 13, and a water-swellable waterstop strip 14 is set inside the upper elevation seat 13. The water-swellable waterstop strip 14 is used to expand after contact with water, filling the gap between the sealing membrane 4 and the upper elevation seat 13, thereby enhancing the sealing effect. The water-swellable waterstop strip 14 is located inside the groove. The water-swellable waterstop strip 14, together with the annular steel pressure strip 15, can enhance the sealing between the sealing membrane 4 and the top of the mixing pile 2. The two work together to reinforce the seal, thereby ensuring the stability of the negative pressure in the closed space. The sealing membrane 4 has a double-layer composite structure. The lower layer is any one of polyethylene (PE) geomembrane, ethylene-vinyl acetate copolymer (EVA) geomembrane, or polyvinyl chloride (PVC) geomembrane, and the upper layer is any one of non-woven fabric, geotextile, or woven fabric. Preferably, the lower layer is HDPE (High-Density Polyethylene) geomembrane, and the upper layer is a non-woven protective layer. The HDPE geomembrane functions to prevent air from entering the enclosed space to maintain negative pressure, and the non-woven fabric functions to protect the lower geomembrane.

[0038] See Figure 1 , Figure 5 and Figure 6 Furthermore, the sidewall of the mixing pile 2 is provided with a reinforcement component to enhance the structural strength and integrity of the mixing pile 2, and improve its shear resistance and deformation resistance. The reinforcement component includes a ring-shaped reinforcing rib 16, which is located on the side wall of the mixing pile 2. The ring-shaped reinforcing rib 16 is used to enhance the integrity and shear resistance of the mixing pile 2 in the depth direction, and reduce the risk of pile fracture caused by uneven settlement of the foundation 1. The ring-shaped reinforcing rib 16 is a segmented structure, which facilitates transportation and on-site assembly, and is adapted to the construction convenience of the mixing pile 2 in the soft soil foundation 1. Each ring-shaped reinforcing rib 16 is fixedly connected to a locking block 19 on its side wall. The locking block 19 is used to position and initially connect adjacent ring-shaped reinforcing rib segments 16, ensuring the concentricity of the assembled ring structure. The side wall of the locking block 19 is slidably connected inside the adjacent ring-shaped reinforcing ribs 16. The locking block 19 cooperates with the adjacent ring-shaped reinforcing ribs 16 to slide and splice, achieving the effect of rapid assembly of the ring-shaped reinforcing ribs 16. The ring-shaped reinforcing ribs 16 are connected by bolts, which are used to fasten the segmented ring-shaped reinforcing ribs 16 into a whole, ensuring its structural stability.

[0039] Furthermore, the outer ring of the annular reinforcing rib 16 is fixedly connected with triangular pyramidal anchor teeth 17. The triangular pyramidal anchor teeth 17 are used to form a mechanical interlock with the surrounding cement and soil, enhancing the connection strength between the annular reinforcing rib 16 and the pile body. The inner ring of the annular reinforcing rib 16 is fixedly connected with radial ribs 18. The radial ribs 18 are used to improve the rigidity of the annular reinforcing rib 16 itself and resist the shear stress effect generated by the deformation of the pile body. The annular reinforcing rib 16 has through holes 20 inside, which are used to allow cement grout to penetrate into them, enhancing the bonding effect between the annular reinforcing rib 16 and the cement and soil. The triangular pyramidal anchor teeth 17 are inclined at 45°. The 45° inclination angle is used to optimize the interlocking force between the anchor teeth and the cement and soil, improve the pull-out resistance, and form a mechanical interlock with the surrounding cement and soil.

[0040] Furthermore, a pressure sensor is installed inside the horizontal main pipe 6. The pressure sensor is used to monitor the vacuum pressure inside the horizontal main pipe 6 in real time, providing data for the vacuum pump 8 to adjust the vacuum level. The pressure sensor is spaced 2m apart, which is used to densely monitor the pressure distribution in the pipeline and promptly capture pressure anomalies in different areas.

[0041] The working principle of this vacuum preloading combined cement mixing wall is as follows:

[0042] When the equipment is used, the mixing pile 2 is constructed by a four-axis deep mixing machine, forming a grid-like structure. Its bottom is 0.8m higher than the designed pile bottom elevation through the lower elevation seat 21, and its top is 400mm higher than the designed elevation through the upper elevation seat 13. The annular groove and water-swellable waterstop strip 14 in the upper elevation seat 13 provide a sealing foundation for the sealing membrane 4. At the same time, annular reinforcing bars 16 are set every 3m along the depth direction inside the mixing pile 2. The annular reinforcing bars 16 are spliced ​​by three sections of arc-shaped steel bars through the clamp 19 and bolts. The surface through holes 20, the 45° inclined triangular cone anchor teeth 17 and the inner radial ribs 18 interlock with the cement soil to enhance the integrity and shear resistance of the pile body.

[0043] The drainage boards 3 are vertically inserted into the foundation 1 in a plum blossom-shaped array with an adjacent spacing of 1.2m and the top extends 30cm above the ground surface. In its I-shaped structure, the guide edges 9 of the horizontal wing plates on both sides are inclined at 30°. They collect water from the foundation 1 through the water-permeable holes 10 and transport it upward through the three guide channels 12 in the middle vertical plate. The triangular reinforcing ridges 11 on the horizontal wing plates are 5mm high and spaced 15cm apart to ensure that the drainage boards 3 do not deform under pressure.

[0044] The grid-shaped mixing wall has drainage blind ditches inside the grid, which are connected to the end of the drainage board 3 to form a deep drainage path.

[0045] The surface of the foundation 1 is covered with a double-layer sealing membrane 4, with a lower layer of HDPE geomembrane and an upper layer of non-woven fabric. The edges are sealed and connected to the water-swellable waterstop strip 14 at the top of the mixing pile 2 by an annular steel pressure strip 15, replacing the traditional sealing trench and forming a closed space.

[0046] The vertical branch pipe 5 penetrates the sealing membrane 4, and its lower end is connected to the drainage board 3 through a tee connector. Its upper end is connected to the horizontal main pipe 6. The horizontal main pipe 6 is arranged with multiple grid-divided sections along the surface of the sealing membrane 4. Pressure sensors are installed every 2m, and the end is connected to the vacuum pump 8 through the valve 7.

[0047] The vacuum pump 8 is started, and negative pressure is transmitted to the drainage board 3 through the manifold 22, the horizontal main pipe 6, and the vertical branch pipe 5. The sealing structure of the sealing membrane 4 and the mixing pile 2 ensures that the negative pressure in the closed space is stable. The pressure sensor monitors the pressure in the horizontal main pipe 6 in real time and feeds it back to the vacuum pump 8, so that the negative pressure in the foundation 1 is maintained at 80kPa±5kPa. Under the action of negative pressure, the pore water in the foundation 1 enters the diversion channel 12 through the water-permeable holes 10 of the drainage board 3, and is discharged through the vertical branch pipe 5 and the horizontal main pipe 6. The drainage blind ditch accelerates the collection of deep water into the drainage board 3, avoiding drainage blind areas. As the water is discharged, the pores of the soil in the foundation 1 are compressed, and the strength is improved.

[0048] The grid-shaped mixing pile 2 resists the deformation of the foundation 1 through the wall constraint and the reinforcement of the annular reinforcing rib 16, ensuring uniform consolidation. The grid structure of the mixing pile 2 serves as a sealing curtain to block external water replenishment and also constrains the deformation of the foundation 1 through its own strength. The vacuum preloading system efficiently discharges water through the drainage board 3 and the networked pipeline. The two work together to shorten the consolidation period and ultimately improve the bearing capacity of the foundation 1, meeting the requirements of subsequent projects for the stability of the foundation 1.

[0049] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A vacuum preloading combined cement mixing wall, comprising a foundation (1), characterized in that: The foundation (1) is equipped with mixing piles (2), the upper surface of the foundation (1) is equipped with a sealing membrane (4), the upper surface of the sealing membrane (4) is equipped with a vertical branch pipe (5), the top of the vertical branch pipe (5) is fixedly connected with a horizontal main pipe (6), the upper surface of the foundation (1) is equipped with a manifold (22), multiple horizontal main pipes (6) are connected to the manifold (22), the side wall of the manifold (22) is equipped with a valve (7), the upper surface of the foundation (1) is equipped with a vacuum pump (8), the output end of the vacuum pump (8) is fixedly connected to one end of the manifold (22), and the foundation (1) is equipped with a drainage assembly. The drainage assembly includes a drainage plate (3), which is fixedly connected inside the foundation (1). One end of the vertical branch pipe (5) passes through the sealing membrane (4) and is connected to the drainage plate (3). The drainage plate (3) has a guide edge (9) extending outward from its edge. The guide edge (9) has a water-permeable hole (10) inside. The side wall of the drainage plate (3) is fixedly connected with multiple reinforcing ridges (11). The drainage plate (3) has a guide channel (12) inside.

2. The vacuum preloading combined cement mixing wall according to claim 1, characterized in that: Multiple mixing piles (2) are interlocked to form a grid-like wall unit. Drainage blind ditches are set within the grid formed by the multiple mixing piles (2), and the drainage blind ditches are connected to the end of the drainage board (3).

3. The vacuum preloading combined cement mixing wall according to claim 1, characterized in that: The top of the drainage board (3) extends beyond the surface of the foundation (1) by a predetermined length and is connected to the vertical branch pipe (5) through a tee connector. The guide edge (9) has an inclination angle of 25° to 35°, and the guide channel (12) is connected to the permeable hole (10).

4. The vacuum preloading combined cement mixing wall according to claim 1, characterized in that: The upper surface of the sealing membrane (4) is provided with an annular steel strip (15), and the edge of the sealing membrane (4) is connected to the top of the mixing pile (2) through the annular steel strip (15); The bottom of the mixing pile (2) is fixedly connected to a lower elevation seat (21), and the contact edge between the mixing pile (2) and the foundation (1) is fixedly connected to an upper elevation seat (13). The upper elevation seat (13) has a groove inside, and a water-swellable waterstop strip (14) is provided inside the upper elevation seat (13). The water-swellable waterstop strip (14) is located inside the groove.

5. The vacuum preloading combined cement mixing wall according to claim 1, characterized in that: The sealing membrane (4) has a double-layer composite structure, with the lower layer being a polyethylene geomembrane and the upper layer being a non-woven protective layer.

6. The vacuum preloading combined cement mixing wall according to claim 1, characterized in that: The mixing pile (2) is provided with a reinforcement component on its side wall. The reinforcement component includes annular reinforcing ribs (16). The annular reinforcing ribs (16) are located on the side wall of the mixing pile (2). The annular reinforcing ribs (16) are segmented structures. Each annular reinforcing rib (16) is fixedly connected to a locking block (19) on its side wall. The locking block (19) is slidably connected to the inside of adjacent annular reinforcing ribs (16). The annular reinforcing ribs (16) are connected to each other by bolts.

7. A vacuum preloading combined cement mixing wall according to claim 6, characterized in that: The outer ring of the annular reinforcing rib (16) is fixedly connected with triangular cone-shaped anchor teeth (17), and the inner ring of the annular reinforcing rib (16) is fixedly connected with radial ribs (18). The annular reinforcing rib (16) has through holes (20) inside. The triangular cone-shaped anchor teeth (17) are inclined at 45° and form a mechanical interlock with the surrounding cement soil.

8. A vacuum preloading combined cement mixing wall according to claim 1, characterized in that: A pressure sensor is installed inside the horizontal main tube (6).

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