Soft foundation treatment structure for improving over-wide roadbed by using permeable blind pipes and construction method

Abstract

The soft foundation treatment structure comprises a first sand cushion layer, a plastic drainage plate, a permeable blind pipe layer and a second sand cushion layer in sequence from bottom to top, a first permeable hose and a second permeable hose are arranged in the permeable blind pipe, the first permeable hose is arranged in the X direction, and the second permeable hose is arranged in the Y direction. The second water-permeable hoses are arranged in the Y direction, water collecting wells are arranged at the junctions of the first water-permeable hoses and the second water-permeable hoses, and the first water-permeable hoses and the second water-permeable hoses are covered with the second sand cushion layer. Through cooperation of the permeable blind pipe layer and the water collecting well, drainage paths are reduced, and the problem that the permeation rate of a plastic drainage plate in the later period is low is solved, so that the purpose of accelerating pore water to be drained out of a soil body early and quickly is achieved, soil body consolidation is accelerated, the consolidation effect is improved, and the construction period is shortened.

Description

Technical Field

[0001] The present application relates to the technical field of subway vibration reduction systems, and in particular to a soft foundation treatment structure and construction method for improving an overly wide roadbed by using permeable blind pipes. Background Art

[0002] The Pearl River Delta plain is densely networked with waterways and numerous lakes and ponds. The primary geological characteristic of the route is soft soil, which includes fluidized plastic silt and soft plastic muddy soil. This soil is widespread and widespread, with a large, continuous thickness ranging from 11 to 28 meters. This soft soil is characterized by high water content, a large porosity, high compressibility, high sensitivity, and low bearing capacity. This translates to poor mechanical properties due to its thixotropy, rheological properties, high pressure resistance, and low strength.

[0003] Soft soil roadbed sections are prone to post-construction settlement and differential settlement, which can cause cracking, sinking, rutting, and slurry pumping. In severe cases, the entire road surface can sink or shift. This is especially true for backfill roadbed and structures behind abutments. Post-construction differential settlement can cause misalignment, which can easily cause vehicles to jump when passing through, leading to safety accidents. Therefore, the quality of soft soil treatment has a significant impact on the project.

[0004] Existing soft foundation treatment typically involves laying plastic drainage boards underground and then applying preloading. The boards create drainage channels in the soil. The preloading applies an external load, causing pore water to continuously drain from the soil along these channels. This increased stress on the soil compresses it, gradually reducing its porosity. Therefore, the speed of soil consolidation depends on whether the pore water can be drained quickly and quickly. However, relying solely on plastic drainage boards results in a slow infiltration rate and poor soil consolidation. Summary of the Invention

[0005] The purpose of this application is to provide a soft foundation treatment structure and construction method using permeable blind pipes to improve the over-wide roadbed, so as to improve the problem that the high-altitude construction of tie beams is more troublesome and has higher safety hazards.

[0006] In the first aspect, the present application provides a soft foundation treatment structure using permeable blind pipes to improve the over-wide roadbed, which adopts the following technical solutions: A permeable blind pipe is used to improve the soft foundation treatment structure of an overly wide roadbed. From bottom to top, it includes a first sand cushion layer, a plastic drainage board, a permeable blind pipe layer, and a second sand cushion layer. A first permeable hose and a second permeable hose are arranged in the permeable blind pipe. The first permeable hose is arranged along the X direction, and the second permeable hose is arranged along the Y direction. A water collection well is provided at the junction of the first permeable hose and the second permeable hose. The second sand cushion layer covers the first permeable hose and the second permeable hose.

[0007] By adopting the above technical solution, a permeable blind pipe layer and a water collection well are added to the plastic drainage board. The first permeable hose and the second permeable hose can quickly absorb the moisture of the drainage cushion layer into the pipe, and then discharge it to the water collection well at the intersection of the first permeable hose and the second permeable hose, and finally forcibly discharge it to the drainage ditch or the existing water system; through the cooperation of the permeable blind pipe layer and the water collection well, the drainage path is reduced, and the characteristic of the slow permeation rate of the plastic drainage board in the later stage is solved, so as to achieve the purpose of accelerating the early and rapid discharge of pore water from the soil, thereby accelerating the consolidation of the soil, improving the consolidation effect, and shortening the construction period.

[0008] Optionally, the area where the water collection well is connected to the first permeable hose or the second permeable hose is the water inlet area, a plurality of water inlet holes are provided on the side wall of the water inlet area, and a first anti-filtration geotextile is provided on the side wall of the water inlet area.

[0009] According to the above technical solution, by arranging the first anti-filter geotextile on the side wall of the water inlet area, it is convenient to filter the water entering the water collection well, so that mud and sand impurities cannot enter the water collection well.

[0010] Optionally, the first permeable hose or the second permeable hose includes a spring steel wire layer, a permeable layer, a filter layer and a coating layer which are sequentially arranged from the inside out.

[0011] Through the above technical solution, the pipe body is supported by the spring steel wire layer to form a high-pressure-resistant soft structure. The permeable layer and the filter layer cooperate with each other to isolate mud and sand impurities while facilitating water to quickly enter the pipe body, achieving the function of net water seepage. The covering layer can collect excess water in the soil, help the soil to consolidate quickly, and at the same time absorb and quickly discharge the water in the plastic drainage board to improve drainage efficiency.

[0012] Optionally, the connection point of the first permeable hose or the second permeable hose is covered with a second anti-filtration geotextile.

[0013] Through the above technical solution, the second anti-filtration geotextile is used to filter the water body, reducing the possibility of mud, sand and other impurities entering the pipe body from the connection point of the first permeable hose or the second permeable hose.

[0014] A construction method for constructing the above-mentioned soft foundation treatment structure for improving an over-wide roadbed by using a permeable blind pipe comprises the following steps: S1. Laying the first sand cushion layer; S2. Laying a plastic drainage board on the first sand cushion layer; S3, laying a permeable hose layer on the plastic drainage board, and constructing a water collection well, and then connecting the first permeable pipe and the second permeable pipe to the corresponding water collection well; S4. Laying a second sand cushion layer on the plastic drainage board so that the second sand cushion layer covers the permeable hose layer, and performing preloading on the second sand cushion layer.

[0015] Optionally, in step S3, the adjacent first permeable hoses or second permeable hoses are connected by driving U-shaped nails at the joints, and the adjacent first permeable hoses or second permeable hoses are defined as an outer permeable pipe and an inner permeable pipe, the outer permeable pipe is sleeved on the inner permeable pipe, and the U-shaped nails are driven into the outer permeable pipe and the inner permeable pipe by a nailing device.

[0016] By adopting the above technical solution, the connection of the joints of adjacent first permeable hoses or second permeable hoses is achieved by using U-shaped staples, which is more reliable and convenient.

[0017] Optionally, the nailing device includes a frame, an inner support plate and a nailing assembly, the frame includes a left frame and a right frame, the inner support plate includes a left support plate and a right support plate, the left support plate is connected to the left frame, and the right frame is connected to the right support plate, the cross-section of the inner support plate is circular, the inner support plate is sleeved on the inner water-permeable pipe, one end of the inner water-permeable pipe is sleeved on the inner support plate after being turned outward toward the other end, and one end of the outer water-permeable pipe is sleeved on the outer turn-up of the inner water-permeable pipe, the nailing assembly is arranged on the frame, and is used to drive U-shaped nails into the outer turn-up of the outer water-permeable pipe and the inner water-permeable pipe.

[0018] By adopting the above technical solution, the inner support plate is used to facilitate the outer flange of the inner water-permeable pipe, and then the outer water-permeable pipe is put on the inner water-permeable pipe, and U-shaped nails are driven into the flanges of the outer water-permeable pipe and the inner water-permeable pipe through the nailing assembly, thereby realizing the connection between the outer water-permeable pipe and the inner water-permeable pipe. At the same time, due to the support of the inner support plate, the driven U-shaped nails can be relatively neat along the circumference of the inner support plate, thereby improving the construction quality and making up for the lack of on-site construction management.

[0019] Optionally, the nailing assembly includes a left nail barrel and a right nail barrel, the left nail barrel is connected to the left frame, and the right nail barrel is connected to the right frame. The left nail barrel is provided with a nail storage slot for storing U-shaped nails, and the left nail barrel is also provided with a nail slot perpendicular to the nail storage slot. There are multiple nail slots along the circumference of the left nail barrel, and a nail piece slides in each nail slot. A pressure rod slides on the left frame, and one end of the pressure rod located in the left frame is connected to a pressure plate, and multiple nail pieces are hinged to the pressure plate, and the nail groove penetrates the nail barrel along its own length direction, and the nail groove is connected to the nail storage slot; the structure of the right nail barrel is the same as that of the left nail barrel.

[0020] Through the above technical solution, when nailing, the pressure rod is pushed, and the pressure rod drives the pressure plate to move, and the pressure plate drives multiple nailing pieces to move along the corresponding nailing grooves. Each nailing piece pushes a U-shaped nail into the outer water-permeable pipe and the inner water-permeable pipe. When the U-shaped nail touches the inner support plate, the two nail legs bend, and then the inner water-permeable pipe and the outer water-permeable pipe are connected. Through the cooperation of the pressure rod, the pressure plate and the nailing piece, multiple U-shaped nails can be driven in synchronously, thereby improving construction efficiency.

[0021] Optionally, circular arc grooves are provided on the inner support plate, and the number of the circular arc grooves is equal to the number of the nailing grooves and corresponds one-to-one to the nailing grooves.

[0022] By adopting the above technical solution, the groove wall of the arc groove is easy to contact with the nail feet of the U-shaped nail, which makes it easier for the two nail feet of the U-shaped nail to bend inward, thereby improving the stability of the connection between the inner and outer water-permeable pipes.

[0023] Optionally, the end of the nail storage groove away from the nail driving groove is arranged along the axial direction of the left nail driving cylinder and is connected to a nail storage cover. The nail storage cover is connected to a compression spring, and the compression spring is used to compress the U-shaped nail.

[0024] By adopting the above technical solution, the compression spring is convenient for compressing the U-shaped nail, and the nailing piece is convenient for pushing the U-shaped nail better and more stably.

[0025] In summary, this application includes at least one of the following beneficial technical effects: 1. Add a permeable blind pipe layer and a water collection well to the plastic drainage board. The first permeable hose and the second permeable hose can quickly draw water from the drainage cushion layer into the pipe, and then discharge it to the water collection well at the intersection of the first permeable hose and the second permeable hose, and finally force it into the drainage ditch or existing water system. The cooperation between the permeable blind pipe layer and the water collection well reduces the drainage path and solves the slow permeability of the plastic drainage board in the later stage, thereby achieving the purpose of accelerating the early and rapid discharge of pore water from the soil, thereby accelerating soil consolidation, improving the consolidation effect, and shortening the construction period. 2. By installing the first anti-filter geotextile on the side wall of the water inlet area, it is convenient to filter the water entering the water collection well, so that mud and sand impurities cannot enter the water collection well; 3. The pipe body is supported by a spring steel wire layer to form a highly compressive soft structure. The permeable layer and the filter layer cooperate with each other to isolate mud and sand impurities while facilitating the rapid entry of water into the pipe body, achieving the function of net water seepage. The covering layer can collect excess water in the soil, helping the soil to consolidate quickly. At the same time, it draws water from the plastic drainage board and quickly discharges it, improving drainage efficiency. 4. Use the second anti-filtration geotextile to filter the water body to reduce the possibility of mud, sand and other impurities entering the pipe body from the connection point of the first permeable hose or the second permeable hose; 5. The inner support plate facilitates the outer flange of the inner water-permeable pipe, and then the outer water-permeable pipe is sleeved on the inner water-permeable pipe, and U-shaped nails are driven into the flanges of the outer water-permeable pipe and the inner water-permeable pipe through the nailing assembly, thereby realizing the connection between the outer water-permeable pipe and the inner water-permeable pipe. At the same time, due to the support of the inner support plate, the driven U-shaped nails can be relatively neat along the circumference of the inner support plate, thereby improving the construction quality and making up for the lack of on-site construction management. 6. When nailing, push the pressure rod, which drives the pressure plate to move, and the pressure plate drives multiple nailing pieces to move along the corresponding nailing grooves. Each nailing piece pushes a U-shaped nail into the outer water-permeable pipe and the inner water-permeable pipe. When the U-shaped nail touches the inner support plate, the two nail legs bend, thereby connecting the inner water-permeable pipe and the outer water-permeable pipe. Through the cooperation of the pressure rod, pressure plate and nailing piece, multiple U-shaped nails can be driven in synchronously, thereby improving construction efficiency. 7. The wall of the arc groove is easy to contact with the nail legs of the U-shaped nail, which makes it easier for the two nail legs of the U-shaped nail to bend inward, thereby improving the stability of the connection between the inner and outer water pipes; 8. The compression spring facilitates the compression of the U-shaped staples, making it easier for the nailing blade to push the U-shaped staples more stably. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a cross-sectional schematic diagram of the overall soft foundation treatment structure of the present invention that uses permeable blind pipes to improve the over-wide roadbed.

[0027] Figure 2 It is a structural schematic diagram of the water collection well in the present invention.

[0028] Figure 3 It is a structural schematic diagram of the first water-permeable hose in the present invention.

[0029] Figure 4 It is a structural schematic diagram of the nailing device in the present invention.

[0030] Figure 5 It is a schematic diagram of the cross-section structure of the nailing device in the present invention.

[0031] Figure 6 It is a schematic cross-sectional view showing the side of the nailing device in the present invention.

[0032] Figure 7 yes Figure 6 A partial enlarged view of part A in the middle.

[0033] In the figure, 1, first sand cushion layer; 2, plastic drainage board; 3, permeable blind pipe layer; 31, first permeable hose; 311, spring steel wire layer; 312, permeable layer; 313, filter layer; 314, coating layer; 32, second permeable hose; 321, outer permeable pipe; 322, inner permeable pipe; 4, second sand cushion layer; 5, water collection well; 51, first anti-filtration geotextile; 6, frame; 61 , left frame; 62, right frame; 7, inner support plate; 71, left support plate; 72, right support plate; 8, nailing assembly; 81, left nail barrel; 811, nail storage slot; 812, nailing slot; 813, nailing piece; 8131, U-shaped nail; 814, pressure rod; 815, pressure plate; 816, push plate; 817, guide rod; 818, nail storage cover; 819, compression spring; 82, right nail barrel. DETAILED DESCRIPTION

[0034] The present invention will now be described in further detail with reference to the accompanying drawings, which are simplified schematic diagrams that illustrate the basic structure of the present invention in a schematic manner.

[0035] In the description of the present invention, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like, indicating positions or relationships, are based on the positions or relationships shown in the accompanying drawings and are intended solely to facilitate the description of the present invention and simplify the description. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limiting the present invention. Furthermore, features defined as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, "plurality" means two or more. In the description of the present invention, it should be noted that, unless otherwise specified or limited, the terms "mounted," "connected," and "connected" should be broadly understood, for example, to mean fixed, removable, or integral; mechanically or electrically connected; directly or indirectly through an intermediary; or internally connected between two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0036] Example 1 In a first aspect, the present application discloses a soft foundation treatment structure for an overly wide roadbed using a permeable blind pipe.

[0037] Use permeable blind pipe to improve the soft foundation treatment structure of over-wide roadbed, refer to Figures 1 to 3From bottom to top, it includes a first sand cushion layer 1, a plastic drainage board 2, a permeable blind pipe layer 3 and a second sand cushion layer 4. The first permeable hose 31 and the second permeable hose 32 are arranged in the permeable blind pipe. The first permeable hose 31 is arranged along the X direction, and the second permeable hose 32 is arranged along the Y direction. A water collection well 5 is provided at the junction of the first permeable hose 31 and the second permeable hose 32. The second sand cushion layer 4 covers the first permeable hose 31 and the second permeable hose 32. By adding a permeable blind pipe layer 3 and a water collection well 5 to the plastic drainage board 2, the first permeable hose 31 and the second permeable hose 32 can quickly absorb the moisture of the drainage cushion layer into the pipeline, and then discharge it to the water collection well 5 at the intersection of the first permeable hose 31 and the second permeable hose 32, and finally force it into the drainage ditch or the existing water system; through the cooperation of the permeable blind pipe layer 3 and the water collection well 5, the drainage path is reduced, and the slow permeation rate of the plastic drainage board 2 in the later stage is solved, thereby achieving the purpose of accelerating the early and rapid discharge of pore water from the soil, thereby accelerating the consolidation of the soil, improving the consolidation effect, and shortening the construction period.

[0038] Specifically, the area where the water collection well 5 is connected to the first permeable hose 31 or the second permeable hose 32 is the water inlet area. A number of water inlet holes are provided on the side wall of the water inlet area. A first anti-filter geotextile 51 is provided on the side wall of the water inlet area. The first anti-filter geotextile 51 facilitates filtering the water entering the water collection well 5 so that mud and sand impurities cannot enter the water collection well 5.

[0039] Specifically, the first permeable hose 31 or the second permeable hose 32 includes, from the inside out, a spring steel wire layer 311, a permeable layer 312, a filter layer 313, and a coating layer 314. The spring steel wire layer 311, permeable layer 312, filter layer 313, and coating layer 314 can be made of high-strength spring steel wire, treated with phosphorus to prevent rust and coated with PVC to protect against acid and alkali corrosion. Furthermore, the steel wire uses a spiral skeleton to ensure a smooth surface and withstand pressure, forming a highly compressive, flexible structure to support the tank. The permeable layer 312 can be woven with a warp made of high-strength nylon yarn and a weft made of a special fiber. The special fiber can be polyester or synthetic polyester, as long as it provides good permeability. The filter layer 313 can be made of non-woven fabric to isolate mud and sand impurities. The covering layer 314 can adopt the same structure as the permeable layer 312 so as to collect excess water in the soil and help the soil to consolidate quickly. At the same time, it can absorb and quickly discharge the water in the plastic drainage board 2 to improve drainage efficiency.

[0040] It should be noted that the connection between the first permeable hose 31 and the second permeable hose 32 is covered with a second filter geotextile. The second filter geotextile filters the water and reduces the possibility of mud, sand and other impurities entering the hose through the connection between the first permeable hose 31 and the second permeable hose 32.

[0041] A construction method for constructing the above-mentioned soft foundation treatment structure for improving an over-wide roadbed by using a permeable blind pipe comprises the following steps: S1, laying the first sand cushion layer 1; S2, laying a plastic drainage board 2 on the first sand cushion layer 1; S3. Lay a layer of permeable hoses on the plastic drainage board 2 and construct a water collection well 5. Then, connect the first and second permeable hoses to the corresponding water collection wells 5. Connect adjacent first permeable hoses 31 or second permeable hoses 32 by driving U-shaped staples 8131 into the joints. After the joints are connected, they are covered with a first filter geotextile 51. The inside of the first filter geotextile 51 is coated with glue, which connects the first filter geotextile 51 to the first permeable hose 31 or second permeable hose 32.

[0042] Adjacent first permeable hoses 31 or second permeable hoses 32 are defined as an outer permeable hose 321 and an inner permeable hose 322. The outer permeable hose 321 is sleeved over the inner permeable hose 322, and a U-shaped staple 8131 is driven into the outer permeable hose 321 and the inner permeable hose 322 using a nailing device. The U-shaped staple 8131 provides a reliable and convenient connection at the joint of the adjacent first permeable hoses 31 or second permeable hoses 32.

[0043] Specifically, refer to Figure 4 Only Figure 7 The nailing device includes a frame 6, an inner support plate 7, and a nailing assembly 8. The frame 6 includes a left frame 616 and a right frame 626. The inner support plate 7 includes a left support plate 71 and a right support plate 72. The left support plate 71 is fixedly connected to the left frame 616, and the right frame 626 is fixedly connected to the right support plate 72. The inner support plate 7 has a circular cross-section, that is, the left support plate 71 and the right support plate 72 both have semicircular cross-sections. The inner support plate 7 is mounted on the inner water-permeable pipe 322. One end of the inner water-permeable pipe 322 is turned outward toward the other end and then mounted on the inner support plate 7. One end of the outer water-permeable pipe 321 is mounted on the outer turn-up of the inner water-permeable pipe 322. The nailing assembly 8 is mounted on the frame 6 and is used to drive U-shaped staples 8131 into the outer turn-up of the outer water-permeable pipe 321 and the inner water-permeable pipe 322.

[0044] During operation, the inner support plate 7 is used to facilitate the outer flange of the inner water-permeable pipe 322, and then the outer water-permeable pipe 321 is put on the inner water-permeable pipe 322, and the U-shaped nails 8131 are driven into the flanges of the outer water-permeable pipe 321 and the inner water-permeable pipe 322 through the nailing assembly 8, thereby realizing the connection between the outer water-permeable pipe 321 and the inner water-permeable pipe 322. At the same time, due to the support of the inner support plate 7, the driven U-shaped nails 8131 can be relatively neat along the circumference of the inner support plate 7, thereby improving the construction quality and making up for the lack of on-site construction management.

[0045] More specifically, the nailing assembly 8 includes a left nailing barrel 81 and a right nailing barrel 82. The left nailing barrel 81 is fixedly connected to the left frame 616, and the right nailing barrel 82 is fixedly connected to the right frame 626. The left nailing barrel 81 is provided with a nail storage groove 811 for storing U-shaped staples 8131. The left nailing barrel 81 is also provided with a nailing groove 812 perpendicular to the nail storage groove 811. There are multiple nailing grooves 812 along the circumference of the left nailing barrel 81. A nailing piece 813 slides in each nailing groove 812. A pressure rod 814 slides on the left frame 616. One end of the pressure rod 814 located in the left frame 616 is connected to a pressure plate 815. The multiple nailing pieces 813 are hinged to the pressure plate 815. The nailing grooves 812 are arranged along their own length and are connected to the nail storage grooves 811. The end of the pressure rod 814 away from the pressure plate 815 is fixedly connected to a push plate 816, and a guide rod 817 is also fixedly connected between the push plate 816 and the pressure rod 814. When nailing, the push plate 816 is pushed, and the push plate 816 pushes the pressure rod 814 to move. The pressure rod 814 drives the pressure plate 815 to move, and the pressure plate 815 drives multiple nailing pieces 813 to move along the corresponding nailing grooves 812. Each nailing piece 813 pushes a U-shaped nail 8131 into the outer water-permeable pipe 321 and the inner water-permeable pipe 322. When the U-shaped nail 8131 touches the inner support plate 7, the two nail legs bend, thereby connecting the inner water-permeable pipe 322 to the outer water-permeable pipe 321. Through the cooperation of the pressure rod 814, the pressure plate 815 and the nailing pieces 813, multiple U-shaped nails 8131 are driven in synchronously, improving construction efficiency.

[0046] The push plate 816 can be pushed manually, or connected to the output end of an electric cylinder or a jack and driven by the electric cylinder or the jack.

[0047] It should be noted that the structure of the right nail barrel 82 is the same as that of the left nail barrel 81, so it will not be described again here.

[0048] In addition, the inner support plate 7 is provided with arcuate grooves, the number of which is equal to the number of nailing grooves 812 and corresponds one-to-one with the nailing grooves 812. The groove walls of the arcuate grooves facilitate contact with the nail legs of the U-shaped staples 8131, thereby facilitating the two nail legs of the U-shaped staples 8131 to bend inward, thereby improving the stability of the connection between the inner and outer water-permeable pipes 322 and 321.

[0049] The end of the nail storage slot 811 away from the nail driving slot 812 is arranged along the axial direction of the left nail driving barrel 81 and is connected to the nail storage cover 818. The nail storage cover 818 and the nail driving barrel can be connected by a clip connection or by screws, as long as the nail storage cover 818 can be fixed to the nail driving barrel. The nail storage cover 818 is fixedly connected to the nail storage cover 818. The compression spring 819 is used to compress the U-shaped staples 8131 so that the U-shaped staples 8131 are tightly attached to the end of the nail storage slot 811 away from the nail storage cover 818, thereby facilitating the nail driving piece 813 to push the U-shaped staples 8131 better and more stably. The U-shaped staples 8131 can be inserted into the nail storage slot 811 in a row. After a row of U-shaped staples 8131 has been used up, a new U-shaped staple 8131 can be inserted.

[0050] S4. Lay the second sand cushion layer 4 on the plastic drainage board 2 so that the second sand cushion layer 4 covers the permeable hose layer, and perform preloading on the second sand cushion layer 4.

[0051] The examples of this specific embodiment are all preferred embodiments of this application and are not intended to limit the scope of protection of this application. Identical components are represented by the same reference numerals. Therefore, any equivalent changes made based on the structure, shape, and principle of this application should be included in the scope of protection of this application.

Claims

1. Use permeable blind pipe to improve the soft foundation treatment structure of over-wide roadbed, which is characterized by: From bottom to top, the invention comprises a first sand cushion layer (1), a plastic drainage board (2), a permeable blind pipe layer (3) and a second sand cushion layer (4); a first permeable hose (31) and a second permeable hose (32) are arranged in the permeable blind pipe; the first permeable hose (31) is arranged along the X direction; the second permeable hose (32) is arranged along the Y direction; a water collection well (5) is provided at the junction of the first permeable hose (31) and the second permeable hose (32); and the second sand cushion layer (4) covers the first permeable hose (31) and the second permeable hose (32).

2. The soft foundation treatment structure for improving an overly wide roadbed by using a permeable blind pipe according to claim 1 is characterized in that: The area where the water collection well (5) is connected to the first permeable hose (31) or the second permeable hose (32) is a water inlet area, and a plurality of water inlet holes are provided on the side wall of the water inlet area. A first anti-filter geotextile (51) is provided on the side wall of the water inlet area.

3. The soft foundation treatment structure for improving an over-wide roadbed by using a permeable blind pipe according to claim 2 is characterized in that: The first water-permeable hose (31) or the second water-permeable hose (32) comprises a spring steel wire layer (311), a water-permeable layer (312), a filter layer (313), and a coating layer (314) which are sequentially arranged from the inside out.

4. The soft foundation treatment structure for improving an over-wide roadbed by using a permeable blind pipe according to claim 3 is characterized in that: The connection point of the first permeable hose (31) or the second permeable hose (32) is covered with a second anti-filter geotextile.

5. A construction method for constructing the soft foundation treatment structure for improving an over-wide roadbed by using a permeable blind pipe as claimed in any one of claims 1 to 4, characterized in that: The steps include: S1, laying the first sand cushion layer (1); S2. Laying a plastic drainage board (2) on the first sand cushion layer (1); S3, laying a permeable hose layer on the plastic drainage board (2), constructing a water collection well (5), and then connecting the first permeable pipe and the second permeable pipe to the corresponding water collection well (5); S4. Laying a second sand cushion layer (4) on the plastic drainage board (2) so that the second sand cushion layer (4) covers the permeable hose layer, and performing preloading on the second sand cushion layer (4).

6. The construction method according to claim 5, characterized in that: In step S3, the adjacent first permeable hoses (31) or second permeable hoses (32) are connected by driving U-shaped nails (8131), and the adjacent first permeable hoses (31) or second permeable hoses (32) are defined as an outer permeable pipe (321) and an inner permeable pipe (322). The outer permeable pipe (321) is sleeved on the inner permeable pipe (322), and the U-shaped nails (8131) are driven into the outer permeable pipe (321) and the inner permeable pipe (322) by a nailing device.

7. The construction method according to claim 6, characterized in that: The nailing device includes a frame (6), an inner support plate (7) and a nailing assembly (8), wherein the frame (6) includes a left frame (61) (6) and a right frame (62) (6), and the inner support plate (7) includes a left support plate (71) and a right support plate (72), wherein the left support plate (71) is connected to the left frame (61) (6), and the right frame (62) (6) is connected to the right support plate (72), and the cross section of the inner support plate (7) is a circle. The inner support plate (7) is sleeved on the inner water-permeable pipe (322), one end of the inner water-permeable pipe (322) is turned outward toward the other end and then sleeved on the inner support plate (7), one end of the outer water-permeable pipe (321) is sleeved on the outer turning edge of the inner water-permeable pipe (322), and the nailing assembly (8) is provided on the frame (6) and is used to drive U-shaped nails (8131) into the outer turning edges of the outer water-permeable pipe (321) and the inner water-permeable pipe (322).

8. The construction method according to claim 7, characterized in that: The nailing assembly (8) includes a left nailing barrel (81) and a right nailing barrel (82), wherein the left nailing barrel (81) is connected to the left frame (61) (6), and the right nailing barrel (82) is connected to the right frame (62) (6), and the left nailing barrel (81) is provided with a nail storage groove (811) for storing U-shaped nails (8131), and the left nailing barrel (81) is also provided with a nailing groove (812) perpendicular to the nail storage groove (811), and the nailing groove (812) is arranged along the left nailing barrel (81) ) is provided with a plurality of nailing pieces (813) in the circumference of each nailing groove (812), a nailing piece (813) slides in the left frame (61) (6), a pressure rod (814) slides on the left frame (61) (6), one end of the pressure rod (814) located in the left frame (61) (6) is connected to a pressure plate (815), and the plurality of nailing pieces (813) are hinged to the pressure plate (815), the nailing groove (812) is arranged to pass through the nailing barrel along its own length direction, and the nailing groove (812) is connected to the nail storage groove (811); The structure of the right nailing cylinder (82) is the same as that of the left nailing cylinder (81).

9. The construction method according to claim 8, characterized in that: The inner support plate (7) is provided with arc grooves, the number of which is equal to the number of the nailing grooves (812) and corresponds one-to-one with the nailing grooves (812).

10. The construction method according to claim 8, characterized in that: One end of the nail storage groove (811) away from the nail driving groove (812) is arranged along the axial direction of the left nail driving cylinder (81) and is connected to a nail storage cover (818). The nail storage cover (818) is connected to a compression spring (819), and the compression spring (819) is used to compress the U-shaped nail (8131).

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