Roadbed air pressure drainage system and construction method thereof

Abstract

The invention provides a roadbed air pressure drainage system and a construction method thereof, and relates to the technical field of roadbed drainage, and the system comprises a plurality of transverse anti-seepage drainage plates which divide a roadbed into a plurality of roadbed units from bottom to top; the transverse drainage plates are sequentially buried in the roadbed unit at intervals from bottom to top; the two vertical shafts are arranged on the two sides of the transverse drainage plates correspondingly, and drainage channels are arranged between the multiple transverse drainage plates and the vertical shafts; the pumping and draining assembly comprises a sucking pump, an inflating pump, a sucking channel and an inflating channel, one end of the sucking channel points to the top of the roadbed unit, the other end of the sucking channel is communicated with the sucking pump, one end of the inflating channel points to the bottom of the roadbed unit, and the other end of the inflating channel is communicated with the inflating pump. And water in the roadbed unit is promoted to migrate towards the transverse drainage plate. The construction method has the effects that the roadbed consolidation speed is increased, and the clogging phenomenon of the drainage plate is reduced.

Description

Technical Field

[0001] This application relates to the technical field of subgrade drainage, and particularly relates to a subgrade air pressure drainage system and its construction method. Background Art

[0002] With the continuous intensification of the global warming trend, extreme climate events such as heavy rain and floods have had a significant impact on subgrade safety, resulting in a decline in subgrade stability and an increase in potential safety hazards. In urban construction, such extreme weather phenomena are inevitable, and the rainfall and floods they trigger often lead to subgrade settlement, structural damage, and even secondary disasters, thus posing a severe challenge to transportation and infrastructure safety. Therefore, the adoption of drainage consolidation technology has become an important measure to mitigate the impact of extreme climate and ensure subgrade safety.

[0003] Traditional consolidation drainage methods usually rely on gravity or natural infiltration, with a slow drainage speed. Especially in soft soil subgrades or areas with excessive moisture, it is difficult to quickly and effectively drain water, affecting the project progress. In addition, the design of traditional drainage systems is often restricted by topographical and geological conditions, unable to flexibly adapt to various geographical environments, and requires a large amount of manual excavation and material input during construction, resulting in a long construction period. At the same time, traditional drainage systems are prone to being blocked by sediments, soil particles, or plant roots, leading to a decline or failure of the drainage function. High maintenance costs are another obvious problem because regular inspections and cleaning are required. More importantly, traditional drainage methods often cannot provide sufficient drainage capacity in the face of extreme weather such as heavy rain or floods, resulting in water accumulation and seriously affecting the stability and bearing capacity of the subgrade. Generally speaking, due to the limitations of their drainage efficiency, adaptability, flexibility, and maintenance requirements, traditional consolidation drainage methods are difficult to meet the requirements of modern projects for efficient, long-term, and intelligent drainage. Summary of the Invention

[0004] In order to overcome the above-mentioned technical problems of the existing technology, this application provides a subgrade air pressure drainage system and its construction method.

[0005] In the first aspect, a subgrade air pressure drainage system provided by this application adopts the following technical solutions: A subgrade air pressure drainage system includes Multiple horizontal anti-seepage drainage plates are provided, and the multiple horizontal anti-seepage drainage plates are arranged at intervals from bottom to top, dividing the subgrade into multiple subgrade units; Multiple horizontal drainage plates are provided, and the multiple horizontal drainage plates are sequentially buried at intervals from bottom to top within the subgrade units; Two groups of vertical shafts are provided, and the two groups of vertical shafts are respectively arranged on both sides of the horizontal drainage plates, and drainage channels for guiding accumulated water into the vertical shafts are provided between the multiple horizontal drainage plates and the vertical shafts; and Exhaust and drainage assembly, the exhaust and drainage assembly includes an air extraction pump, an air inflation pump, an air extraction channel and an air inflation channel. One end of the air extraction channel is inserted into the subgrade unit and points to the top of the subgrade unit, and the other end is communicated with the air extraction pump. One end of the air inflation channel is inserted into the subgrade unit and points to the bottom of the subgrade unit, and the other end is communicated with the air inflation pump. The subgrade unit is pressured by the air extraction pump and the air inflation pump, so that an air pressure difference is formed up and down in the subgrade unit, and the water in the subgrade unit is promoted to migrate to the horizontal drainage board to achieve rapid drainage.

[0006] Furthermore, both ends of the horizontal drainage board are inclined towards the shaft direction on the corresponding side.

[0007] Furthermore, a plurality of fiber optic sensors for monitoring the moisture content inside the subgrade unit are installed at intervals on the horizontal drainage board.

[0008] Furthermore, a plurality of vertical drainage boards are arranged at intervals on both sides of the horizontal drainage board inside the subgrade unit.

[0009] Furthermore, a vertical anti-seepage drainage board is arranged on the side of a vertical drainage board away from the horizontal drainage board, and the vertical anti-seepage drainage board is located on the side of the vertical drainage board away from the horizontal drainage board.

[0010] Furthermore, a permeable geotextile is laid between adjacent two horizontal drainage boards and between adjacent two vertical drainage boards.

[0011] Furthermore, pipes are installed in both the air extraction channel and the air inflation channel, and the pipe includes an inner sleeve and an outer shell.

[0012] Furthermore, a buffer layer is filled between the inner sleeve and the outer shell.

[0013] In the second aspect, a construction method of a subgrade air pressure drainage system provided by the present application, based on the above-mentioned subgrade air pressure drainage system, includes the following steps. S1. Geological exploration. Conduct a detailed geological exploration on the water content of the subgrade, accurately measure the moisture content and distribution in the subgrade, and based on the exploration results, reasonably plan the quantity and construction positions of the horizontal anti-seepage drainage board, horizontal drainage board, shaft and exhaust and drainage assembly. S2. Clean the construction site. Conduct a comprehensive cleaning of the site, remove loose stones and sundries, ensure the area is flat and obstacle-free, and provide good conditions for the safe installation and operation of construction equipment. S3. Construction of the subgrade air pressure drainage system S31. Use a drill to drill the subgrade and install pipes to form an air extraction channel and an air inflation channel. S32. Conduct shaft construction on both sides of the subgrade. After the shaft construction is completed, install the horizontal drainage board and the horizontal anti-seepage drainage board in the subgrade through the shaft with the help of relevant equipment, and install a drainage channel between the horizontal drainage board and the shaft. S33. Install vertical drainage boards and vertical anti-seepage drainage boards in other areas of the subgrade. S4. Conduct layer-by-layer drainage treatment. Start the air extraction pump and the air inflation pump, apply air pressure to the subgrade unit between two adjacent horizontal anti-seepage drainage boards to form an upper and lower air pressure difference, and drive the water inside the subgrade unit to migrate towards the horizontal drainage board to achieve rapid drainage. S5. Conduct grouting and solidification treatment. Control the start and stop of the air extraction pump and the air inflation pump according to the moisture content monitoring of the subgrade unit by the fiber optic sensor. After the drainage treatment of the current subgrade unit is completed, conduct grouting and solidification treatment on the air extraction channel and the air inflation channel at the current subgrade unit. Then, repeat the operations of S31 and S4 for multiple subgrade units above this subgrade unit one by one until the moisture content inside the subgrade drops to the ideal value. S5. Conduct surface treatment. After the construction is completed, the surface needs to be treated to ensure that the surface water can be smoothly guided to the shaft.

[0014] Furthermore, the materials used for the grouting and solidification treatment in step S5 are concrete materials or hygroscopic solidification materials.

[0015] In summary, the present application includes at least one of the following beneficial technical effects: 1. In the present invention, through the air inflation pump and the air extraction pump, the air inflation pump and the air extraction pump apply air pressure at the bottom and top of the subgrade unit respectively to form an upper and lower air pressure difference, which can effectively drive the water inside the subgrade unit to migrate towards the horizontal drainage board to achieve rapid drainage. The air inflation pump injects air at the bottom of the subgrade unit to promote the flow of moisture along the preset channel; the air extraction pump applies negative pressure at the top of the subgrade unit to further enhance the drainage effect. In addition, the inflation process can also form a pneumatic splitting channel around the horizontal drainage board, improve the water permeability of the soil, accelerate the consolidation speed, and reduce the phenomenon of drainage board blockage. 2. The horizontal anti-seepage drainage board used in the subgrade of the present invention not only prevents the reverse penetration of moisture, but also effectively isolates external water sources, maintains a stable negative pressure environment inside the subgrade, and prevents water damage or abnormal water pressure in the subgrade from damaging the bearing capacity. The materials used have environmental protection and sustainability, reducing the negative impact on the environment. At the same time, it also enhances the overall bearing capacity of the subgrade, significantly reduces the long-term maintenance cost, and improves the service life of the subgrade. 3. The horizontal drainage board and vertical drainage board of the present invention are made of corrosion-resistant materials, significantly extending the service life of the materials. Construction workers can replace the drainage board that affects the drainage performance due to blockage in a timely manner according to needs, ensuring that the performance of the drainage system always remains in the best state. This design effectively prevents the impact of heavy rain and flood weather on the safety of the roadbed and guarantees the long-term stable operation of the road; 4. The optical fiber sensors are installed on the horizontal drainage board of the present invention, which can monitor the moisture content inside the roadbed in real time. These optical fiber sensors are made of corrosion-resistant materials and have good environmental adaptability, capable of providing accurate moisture detection under complex conditions; 5. The pipelines in the air inflation channel and air extraction channel of the present invention effectively guarantee the equipment safety during the construction process and the stability of the later operation. After the construction is completed, the air inflation and air extraction devices are removed, and a solidifying material is injected into the pipelines. The solidifying material gradually hardens to form a stable pile structure, significantly enhancing the overall stability and bearing capacity of the roadbed; 6. The drainage system of the present invention is flexibly designed and can be adjusted according to different terrain and environmental conditions, with strong adaptability. Whether in heavy rain areas or flood areas, the present invention can change the number and power of the air inflation pump and air extraction pump, the number of vertical shafts, and the density of the horizontal drainage board. Due to its modular design, it can be flexibly combined and arranged according to actual needs during construction, meeting the requirements of various drainage systems. Description of the Drawings

[0016] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0017] Figure 1 It is a schematic diagram of the overall structure of the embodiment of the present application.

[0018] Figure 2 It is a schematic diagram of the structure of the inner sleeve, outer shell, and buffer layer in the embodiment of the present application.

[0019] Figure 3 It is a schematic diagram of the structure of the vertical shaft, water level sensor, and drainage channel in the embodiment of the present application.

[0020] Reference Signs: 1, horizontal anti-seepage drainage board; 2, horizontal drainage board; 3, vertical shaft; 4, drainage channel; 5, air extraction pump; 6, air inflation pump; 7, air extraction channel; 8, air inflation channel; 9, optical fiber sensor; 10, vertical drainage board; 11, vertical anti-seepage drainage board; 12, permeable geotextile; 13, inner sleeve; 14, outer shell; 15, buffer layer; 16, water level sensor; 17, roadbed unit. Detailed implementation manners

[0021] To make the objectives, technical solutions and advantages of the present invention clearer, the technical solutions in the present invention will be clearly and completely described below with reference to the accompanying drawings in the present invention. Apparently, the described embodiments are some but not all of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present invention without creative efforts shall fall within the protection scope of the present invention.

[0022] An embodiment of the present application discloses a subgrade air pressure drainage system and a construction method thereof. Refer to Figure 1 , the subgrade air pressure drainage system includes a plurality of transverse anti-seepage drainage boards 1, a plurality of transverse drainage boards 2, two groups of vertical shafts 3 and a pumping and drainage assembly. The transverse anti-seepage drainage board 1 is composed of a waterproof geotextile and a drainage board. The number of the transverse anti-seepage drainage boards 1 can be determined according to the depth of the subgrade. In the embodiment of the present application, three transverse anti-seepage drainage boards 1 are provided. The three transverse anti-seepage drainage boards 1 are sequentially and spacedly buried in the subgrade along the depth direction of the subgrade, so as to divide the subgrade into two subgrade units 17 from bottom to top; among them, the uppermost anti-seepage drainage board can effectively prevent the water flow on the road surface from further penetrating into the subgrade.

[0023] Refer to Figure 1 , each subgrade unit 17 corresponds to a plurality of transverse drainage boards 2. In the embodiment of the present application, two transverse drainage boards 2 are provided in each subgrade unit 17. The two transverse drainage boards 2 are spacedly distributed in the subgrade unit 17 along the depth direction of the subgrade. A plurality of optical fiber sensors 9 for monitoring the moisture content inside the subgrade unit 17 are spacedly installed on the transverse drainage boards 2. And the two groups of vertical shafts 3 are respectively arranged on both sides of the transverse drainage boards 2. In order to enable the transverse drainage boards 2 to smoothly divert the accumulated water in the subgrade unit 17 into the vertical shafts 3, a drainage channel 4 for guiding the accumulated water to flow into the vertical shafts 3 is arranged between the transverse drainage boards 2 and the vertical shafts 3. To further accelerate the discharge of the accumulated water, both ends of the transverse drainage boards 2 are inclined towards the corresponding side of the vertical shafts 3, that is, the middle of the transverse drainage boards 2 is high and both sides are low. Considering that the transverse drainage boards 2 will be subjected to the pressure of the upper soil layer and the convenience of construction, the inclination angles of both ends of the transverse drainage boards 2 should not be too large.

[0024] To accelerate the migration of the accumulated water in the subgrade unit 17 towards the transverse drainage boards 2, a pumping and drainage assembly can be used to assist in discharging the accumulated water. The number of the pumping and drainage assemblies can be determined according to the accumulated water condition in the subgrade. In the embodiment of the present application, one group of pumping and drainage assemblies is provided. Refer to Figure 1, the air extraction and injection assembly includes an air extraction pump 5, an air injection pump 6, an air extraction channel 7, and an air injection channel 8. The air extraction channel 7 and the air injection channel 8 are both formed by drilling holes with a drill rig and installing pipes. During construction, the bottommost subgrade unit 17 can be drilled first, so that one end of the air extraction channel 7 is inserted into the subgrade unit 17 and points to the top of the subgrade unit 17, and the other end is connected to the air extraction pump 5. One end of the air injection channel 8 is inserted into the subgrade unit 17 and points to the bottom of the subgrade unit 17, and the other end is connected to the air injection pump 6. Subsequently, according to the detection of the moisture content in the subgrade unit 17 by the fiber optic sensor 9, the start and stop of the air extraction pump 5 and the air injection pump 6 are controlled. Due to the arrangement of the horizontal anti-seepage and drainage plates 1 on both the upper and lower sides of the subgrade unit 17, when the air injection pump 6 injects air at the bottom of the subgrade unit 17, it can promote the flow of moisture along the preset channel. When the air extraction pump 5 applies negative pressure at the top of the subgrade unit 17, the water in the upper subgrade unit 17 is not easy to flow downward. Therefore, an air pressure difference is formed between the upper and lower parts of the subgrade unit 17, which promotes the water in the subgrade unit 17 to migrate to the horizontal drainage plate 2 to achieve rapid drainage until the fiber optic sensor 9 monitors that the moisture content in the subgrade unit 17 is lower than the set value. In addition, when the air injection pump 6 injects air at the bottom of the subgrade unit 17, it can also form a pneumatic splitting channel around the horizontal drainage plate 2, improve the permeability of the soil mass, accelerate the consolidation speed, and reduce the phenomenon of drainage plate blockage. After the water accumulation treatment of the bottommost subgrade unit 17 is completed, the drill rig can be used to continue to form the air extraction channel 7 and the air injection channel 8 for the upper subgrade unit 17, so as to use the air extraction pump 5 and the suction pump to extract and drain the water accumulation of the upper subgrade unit 17 one by one. Treating the water accumulation in the subgrade unit by unit can efficiently reduce the moisture content in the subgrade to the set range.

[0025] After the air extraction channel 7 and the air injection channel 8 for the upper subgrade unit 17 are formed, it is necessary to block the air extraction channel 7 and the air injection channel 8 on the lower subgrade unit 17. Therefore, concrete materials or hygroscopic curing materials can be injected into the pipes. The hygroscopic curing materials can be high molecular water-absorbing resins, cement-based materials, etc. When the concrete materials are cured or the hygroscopic curing materials absorb the moisture in the subgrade unit 17 and are cured, they can form a reinforcement structure similar to a pile foundation together with the pipes. On the one hand, it can prevent rainwater from entering the subgrade, and on the other hand, it can also enhance the overall stability and bearing capacity of the subgrade, thus effectively ensuring the safety and reliability of the structure during long-term operation. To enable the concrete materials or hygroscopic curing materials to smoothly fill the pipes, refer to Figure 2 , the pipe includes an inner sleeve 13 and an outer shell 14. The inner wall of the inner sleeve 13 is relatively smooth to ensure the smooth transportation of gas and fluid; the outer shell 14 is made of high-hardness and corrosion-resistant materials to prevent damage to the pipe caused by external pressure during construction; at the same time, a buffer layer 15 is filled between the inner sleeve 13 and the outer shell 14 to play a buffering role and prevent damage to the core area during construction.

[0026] To further accelerate the drainage of accumulated water in the subgrade unit 17, referring to Figure 1 , a pervious geotextile 12 is also laid between two adjacent horizontal drainage plates 2. The pervious geotextile 12 has excellent water permeability and can form an effective drainage channel 4 inside the soil mass. During the inflation and air extraction process, the pervious geotextile 12 can effectively remove the excess liquid and gas in the soil structure, reduce the water pressure of the soil mass, and prevent deformation or damage caused by water accumulation. At the same time, the pervious geotextile 12 can serve as an anti-filter layer during the inflation and air extraction process to prevent fine-grained soil from entering the drainage system, keep the drainage channel 4 unobstructed, and ensure the long-term stable operation of the system. After the treatment of the subgrade water accumulation is completed, due to the characteristics of the pervious geotextile 12 such as acid and alkali resistance, corrosion resistance, and oxidation resistance, it has strong adaptability and can be used for a long time in a harsh environment. At the same time, it can also effectively disperse, transfer or decompose the concentrated stress, prevent the soil mass from being damaged by external forces, enhance the tensile strength and anti-deformation ability of the soil mass, and improve the stability of the structure.

[0027] Since when using the air extraction pump 5 and the air suction pump to extract air and inflate the subgrade unit 17, the air in other areas of the subgrade is likely to enter the air extraction and inflation area from both ends of the horizontal drainage plate 2, resulting in low drainage efficiency of the subgrade unit 17 in this area. Therefore, referring to Figure 1 , vertical anti-seepage drainage plates 11 are arranged on both sides of the horizontal drainage plate 2 in the subgrade unit 17, so that the subgrade unit 17 can approximately form an independent space under the enclosure of the upper and lower two horizontal anti-seepage drainage plates 1 and the two vertical anti-seepage drainage plates 11 on both sides. In this space, under the combined action of the air extraction pump 5 and the air suction pump, the accumulated water in the subgrade unit 17 can be quickly driven to migrate towards the horizontal drainage plate 2, thereby improving the drainage efficiency of the accumulated water in the subgrade.

[0028] Referring to Figure 1 , a plurality of vertical drainage plates 10 are also arranged at intervals between the vertical anti-seepage drainage plate 11 and the horizontal drainage plate 2. The vertical drainage plates 10 are located on the side of the shaft 3 away from the horizontal drainage plate 2, and the vertical drainage plates 10 close to the shaft 3 are also connected to the shaft 3 through a plurality of drainage channels 4. At the same time, a pervious geotextile 12 is laid between two adjacent vertical drainage plates 10, so that the accumulated water in the subgrade unit 17 can quickly drain along the vertical drainage plates 10 under the action of gravity.

[0029] Referring to Figure 3 , the shaft 3 is arranged between the vertical drainage plate 10 and the horizontal drainage plate 2, and a water level sensor 16 is buried on its inner side wall. The shaft 3 can be used to quickly divert the accumulated water on the horizontal drainage plate 2 and the vertical drainage plate 10 close to the shaft 3, and can also quickly drain the accumulated water on the road surface. Through the water level sensor 16, the current drainage situation of the subgrade can be monitored in real time to ensure that abnormal water levels are promptly detected and corresponding adjustment measures can be taken.

[0030] A construction method of a subgrade air pressure drainage system provided by this application adopts the following technical solutions: S1. Geological exploration: Conduct a detailed geological exploration of the water content of the subgrade, accurately measure the water content and distribution in the subgrade, and based on the exploration results, reasonably plan the quantity and construction positions of the horizontal anti-seepage drainage board 1, horizontal drainage board 2, vertical shaft 3, and pumping and drainage components. S2. Clean the construction site: Conduct a comprehensive cleaning of the site, remove loose stones and sundries, ensure the area is flat and free of obstacles, and provide good conditions for the safe installation and operation of construction equipment. S3. Construction of the subgrade air pressure drainage system S31. Use a drill to drill the subgrade and install pipelines to form an air extraction channel 7 and an air inflation channel 8. S32. Conduct the construction of the vertical shaft 3 on both sides of the subgrade. After the construction of the vertical shaft 3 is completed, install the horizontal drainage board 2 and the horizontal anti-seepage drainage board 1 in the subgrade through the vertical shaft 3 with the help of relevant equipment, and install a drainage channel 4 between the horizontal drainage board 2 and the vertical shaft 3. S33. Install the vertical drainage board 10 and the vertical anti-seepage drainage board 11 in other areas of the subgrade. S4. Layer-by-layer pumping and drainage treatment: Start the air extraction pump 5 and the air inflation pump 6, apply air pressure to the subgrade unit 17 between two adjacent horizontal anti-seepage drainage boards 1 to form an upper and lower air pressure difference, drive the water inside the subgrade unit 17 to migrate towards the horizontal drainage board 2, and achieve rapid drainage. S5. Grouting and solidification treatment: Control the start and stop of the air extraction pump 5 and the air inflation pump 6 according to the monitoring of the water content in the subgrade unit 17 by the fiber optic sensor 9. When the drainage treatment of the current subgrade unit 17 is completed, conduct grouting and solidification treatment on the air extraction channel 7 and the air inflation channel 8 at the current subgrade unit 17, and then repeat the operations of S31 and S4 for multiple subgrade units 17 above this subgrade unit 17 one by one until the water content inside the subgrade drops to the ideal value. S5. Surface treatment: After the construction is completed, the surface needs to be treated to ensure that the surface water can be smoothly guided to the vertical shaft 3.

[0031] The implementation principle of a subgrade air pressure drainage system and its construction method in an embodiment of this application is as follows: According to the monitoring of the water content in the subgrade unit 17 by the fiber optic sensor 9, the air extraction pump 5 and the air inflation pump 6 are driven to start. Since the subgrade unit 17 can approximately form an independent space under the enclosure of the two horizontal anti-seepage drainage plates 1 above and below and the two vertical anti-seepage drainage plates 11 on both sides, when the air inflation pump 6 injects air at the bottom of the subgrade unit 17, it can promote the flow of water along the preset channel. When the air extraction pump 5 applies negative pressure at the top of the subgrade unit 17, the water in the upper subgrade unit 17 is not easy to flow downward. Therefore, an air pressure difference is formed between the upper and lower parts of the subgrade unit 17, which promotes the water in the subgrade unit 17 to migrate to the horizontal drainage plate 2 to achieve rapid drainage. Until the fiber optic sensor 9 monitors that the water content in the subgrade unit 17 is lower than the set value, the air extraction pump 5 and the air suction pump can be turned off. In addition, when the air inflation pump 6 injects air at the bottom of the subgrade unit 17, it can also form a pneumatic fracturing channel around the horizontal drainage plate 2, improve the water permeability of the soil body, accelerate the consolidation speed, and reduce the phenomenon of drainage plate blockage. After the water accumulation treatment of the lowest subgrade unit 17 is completed, the drilling rig can be used to continue forming the air extraction channel 7 and the air inflation channel 8 for the upper subgrade unit 17, so as to use the air extraction pump 5 and the air suction pump to pump and drain the water accumulation of the upper subgrade unit 17 one by one. At the same time, when forming the air extraction channel 7 and the air inflation channel 8 for the upper subgrade unit 17, concrete materials or wet curing materials can be used to fill the air extraction channel 7 and the air inflation channel 8 on the treated subgrade unit 17 to make it a structure similar to a pile foundation. On the one hand, it can prevent rainwater from entering the subgrade, and on the other hand, it also enhances the overall stability and bearing capacity of the subgrade, thus effectively ensuring the safety and reliability of the structure during long-term operation.

[0032] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A roadbed pneumatic drainage system, characterized in that: include A plurality of transverse anti-seepage drainage plates are provided, and the plurality of transverse anti-seepage drainage plates are arranged at intervals from bottom to top, and divide the roadbed into a plurality of roadbed units; A plurality of transverse drainage plates are provided, and the plurality of transverse drainage plates are sequentially buried in the roadbed unit at intervals from bottom to top; Two groups of vertical shafts are provided, and the two groups of vertical shafts are respectively provided on both sides of the transverse drainage board, and drainage channels for guiding the accumulated water to flow into the vertical shafts are provided between the plurality of transverse drainage boards and the vertical shafts; and A drainage component, the drainage component includes an air suction pump, an air charging pump, an air suction channel and an air charging channel, one end of the air suction channel is inserted into the roadbed unit and points to the top of the roadbed unit, and the other end is connected to the air suction pump, one end of the air charging channel is inserted into the roadbed unit and points to the bottom of the roadbed unit, and the other end is connected to the air charging pump. The air suction pump and the air charging pump are used to apply pressure to the roadbed unit, so that an air pressure difference is formed between the upper and lower parts of the roadbed unit, thereby causing the water in the roadbed unit to migrate to the transverse drainage board to achieve rapid drainage.

2. The roadbed pneumatic drainage system according to claim 1, characterized in that: Both ends of the transverse drainage plate are inclined toward the vertical shaft direction of the corresponding side.

3. The roadbed pneumatic drainage system according to claim 1, characterized in that: A plurality of optical fiber sensors for monitoring the moisture content inside the roadbed unit are installed at intervals on the transverse drainage plate.

4. The roadbed pneumatic drainage system according to claim 3, characterized in that: A plurality of vertical drainage boards are arranged at intervals on both sides of the transverse drainage board in the roadbed unit.

5. The roadbed pneumatic drainage system according to claim 4, characterized in that: A vertical anti-seepage drainage board is arranged on the side of a vertical drainage board away from the horizontal drainage board. The vertical anti-seepage drainage board is located on the side of the vertical drainage board away from the horizontal drainage board.

6. The roadbed pneumatic drainage system according to claim 4, characterized in that: Permeable geotextiles are laid between two adjacent transverse drainage boards and between two adjacent vertical drainage boards.

7. The roadbed pneumatic drainage system according to claim 5, characterized in that: Pipes are installed in both the air extraction channel and the air filling channel, and the pipelines include an inner sleeve and an outer shell.

8. The roadbed pneumatic drainage system according to claim 7, characterized in that: A buffer layer is filled between the inner sleeve and the outer shell.

9. A construction method of a roadbed pneumatic drainage system, based on a roadbed pneumatic drainage system as claimed in any one of claims 7 to 8, characterized in that: The following steps are included: S1, geological survey, conduct detailed geological survey on the water content of the roadbed, accurately determine the water content and distribution in the roadbed, and reasonably plan the number and construction location of transverse anti-seepage drainage boards, transverse drainage boards, shafts and pumping and drainage components based on the survey results; S2, clean up the construction site, clean up the site thoroughly, remove loose stones and debris, ensure the area is flat and free of obstacles, and provide good conditions for the safe installation and operation of construction equipment; S3, Construction of roadbed pneumatic drainage system S31, drilling holes in the roadbed using a drilling machine and installing pipes to form an air extraction channel and an air filling channel; S32, constructing shafts on both sides of the roadbed. After the shaft construction is completed, installing transverse drainage boards and transverse anti-seepage drainage boards in the roadbed through the shafts with the help of relevant equipment, and installing drainage channels between the transverse drainage boards and the shafts; S33, in other areas of the roadbed, vertical drain panels and vertical anti-seepage drain panels shall be installed; S4, layer-by-layer drainage treatment, start the vacuum pump and the air pump, apply air pressure to the roadbed unit between two adjacent transverse anti-seepage drainage boards, form an upper and lower air pressure difference, drive the water inside the roadbed unit to migrate to the transverse drainage board, and achieve rapid drainage; S5, grouting and curing treatment, according to the monitoring of the moisture content in the roadbed unit by the optical fiber sensor, the vacuum pump and the inflation pump are started and stopped. After the drainage treatment of the current roadbed unit is completed, the vacuum channel and the inflation channel at the current roadbed unit are grouting and curing. Then, the operations of S31 and S4 are repeated one by one for multiple roadbed units above the roadbed unit until the moisture content inside the roadbed drops to the ideal value; S5, surface treatment, after the construction is completed, the surface needs to be treated to ensure that the surface water can be smoothly guided to the shaft.

10. The construction method of the roadbed pneumatic drainage system according to claim 9, characterized in that: The material used for the grouting and curing process in step S5 is concrete material or hygroscopic curing material.

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