An active drainage subgrade structure

Abstract

The present invention relates to the technical field of subgrade engineering, and specifically relates to an active drainage subgrade structure, which includes a first filling layer, a first waste residue layer, a water absorption and drainage layer, a hydrophobic waterproof layer, a second filling layer, and a second waste residue layer arranged from top to bottom. Evaporators are provided on both sides of the water absorption and drainage layer. The evaporator includes a hollow shell, a partition board, and a first water-absorbing geotextile. Scaly openings are provided on the outer side wall of the hollow shell. The partition board is vertically arranged inside the hollow shell, and a plurality of ventilation holes are opened on the partition board. The first water-absorbing geotextile is wound around the partition board. A first drain pipe with an internal connection is provided under the hollow shell. Drainage blind ditches are provided on both sides from the hydrophobic waterproof layer to the second waste residue layer. The drainage blind ditches are connected to the evaporator through the first drain pipe. A second drain pipe is provided at the bottom end of the drainage blind ditch and is communicated with a side ditch arranged outside the subgrade. By arranging evaporators on both sides of the water absorption and drainage layer in the present invention, it can not only evaporate the water in the water absorption and drainage layer to achieve active drainage, but also ensure that water will not pour in during direct rainfall.

Description

Technical Field

[0001] The present invention relates to the technical field of subgrade engineering, and particularly relates to an active drainage subgrade structure. Background Art

[0002] After a road project has been in operation for some time, cracks will appear in the pavement structure. After rainfall, water enters the internal structure through the cracks, causing an increase in the water content of the subgrade fill, affecting the strength and integrity of the subgrade structure. If the water content of the subgrade fill increases, diseases such as pumping and mud gushing are likely to occur during use, seriously affecting the normal use of the road. In the prior art, the treatment methods for subgrade water damage mainly include setting waterproof layers, intercepting water, drainage structures, and grouting. However, the waterproof layers, water interception, and drainage structures in the prior art only rely on gravity to drain the water inside the subgrade structure, with slow drainage speed, weak drainage capacity, and poor effect. The grouting in the prior art will deteriorate after being used for some time, causing continuous water seepage and being not conducive to long-term use. Summary of the Invention

[0003] In order to overcome the technical problem of poor control effect of subgrade water in the prior art, the present invention provides an active drainage subgrade structure.

[0004] The technical solution adopted by the present invention to achieve the above object is: an active drainage subgrade structure, including a first fill layer 1, a first waste residue layer 2, a water absorption and drainage layer 3, a hydrophobic waterproof layer 5, a second fill layer 7, and a second waste residue layer 8 arranged from top to bottom. Evaporators 4 are provided on both sides of the water absorption and drainage layer 3. The evaporator 4 includes a hollow shell 405, a partition 401, and a first water-absorbing geotextile 402. Scaly openings 404 are provided on the outer side wall of the hollow shell 405. The partition 401 is vertically arranged inside the hollow shell 405, and a plurality of ventilation holes are opened on the partition 401. One end of the first water-absorbing geotextile 402 overlaps on the water absorption and drainage layer 3, and the other end passes through the hollow shell 405 and the partition 401. A first drain pipe 403 with internal communication is provided under the hollow shell 405. The evaporator 4 is used to evaporate the water in the water absorption and drainage layer 3. Drainage blind ditches 6 are provided on both sides from the hydrophobic waterproof layer 5 to the second waste residue layer 8. The drainage blind ditches 6 are arranged under the evaporator 4 and are connected to the evaporator 4 through the first drain pipe 403 for draining the water above the hydrophobic waterproof layer 5. A second drain pipe 10 is provided at the bottom end of the drainage blind ditch 6, and the second drain pipe 10 is connected to a side ditch 9 arranged on both sides of the subgrade;

[0005] Preferably, the number of the partitions 401 is multiple, and the multiple partitions 401 are parallel to each other;

[0006] Preferably, the first water-absorbing geotextile 402 penetrates from the partition 401 on the side close to the water absorption and drainage layer 3 to the partition 401 on the side close to the scaly opening 404, and the first water-absorbing geotextile 402 is arranged in a serpentine shape on the partition 401;

[0007] Preferably, the first waste residue layer 2, the water absorption and drainage layer 3, the hydrophobic waterproof layer 5, and the second soil filling layer 7 are all provided with a 2% cross slope, and the evaporator 4 is provided with a 3% cross slope;

[0008] Preferably, both the evaporator 4 and the drainage blind ditch 6 are uniformly arranged along the length direction of the road, and the distance between adjacent two evaporators 4 is 20m - 50m;

[0009] Preferably, the first soil filling layer 1 is a coarse-grained filler;

[0010] Preferably, the first waste residue layer 2 and the second waste residue layer 8 are mixtures of coal combustion waste residue and fly ash, coarse and fine aggregates, cement, and polyurethane additives after being shelled with bisphenol A epoxy resin;

[0011] Preferably, the water absorption and drainage layer 3 includes a 5 - 10 cm clay layer, a second water-absorbing geotextile, a 5 - 10 cm clay layer, a second water-absorbing geotextile, and a 5 - 10 cm clay layer arranged in sequence from top to bottom, and the first water-absorbing geotextile 402 overlaps on the second water-absorbing geotextile;

[0012] Preferably, the hydrophobic waterproof layer 5 is a polymer waterproofing membrane;

[0013] Preferably, the second soil filling layer 7 is improved soil.

[0014] Compared with the prior art, the beneficial effect of the present invention is that evaporators are arranged on both sides of the water absorption and drainage layer, and water is discharged into the evaporators through capillary action, accelerating the evaporation rate of water. There is a scaly opening on one side of the evaporator, ensuring that the evaporator can not only evaporate the water in the water absorption and drainage layer to achieve active drainage, but also ensure that water will not pour in during direct rainfall. By setting the hydrophobic waterproof layer, the water in the internal structure is maintained to keep the water content. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a cross-sectional schematic view of an active drainage subgrade structure of the present invention.

[0016] Figure 2 is a schematic view of the evaporator structure in an active drainage subgrade structure of the present invention.

[0017] In the figure: 1: first soil filling layer; 2: first waste residue layer; 3: water absorption and drainage layer; 4: evaporator; 401: partition board; 402: first water absorption geotextile; 403: first drain pipe; 404: scaly opening; 405: hollow shell; 5: hydrophobic waterproof layer; 6: drainage blind ditch; 7: second soil filling layer; 8: second waste residue layer; 9: side ditch; 10: second drain pipe. Detailed implementation manners

[0018] The following further describes in detail the implementation manners of the present invention with reference to the accompanying drawings and embodiments. The following embodiments are used to illustrate the present invention, but cannot be used to limit the scope of the present invention.

[0019] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "horizontal", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0020] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the term "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations. In addition, in the description of the present invention, unless otherwise stated, the meaning of "a plurality" is two or more.

[0021] Such as Figure 1 And Figure 2As shown in the figure, an active drainage subgrade structure in this embodiment includes a first filling layer 1, a first waste residue layer 2, a water absorption and drainage layer 3, a hydrophobic waterproof layer 5, a second filling layer 7, and a second waste residue layer 8 arranged from top to bottom. Evaporators 4 are provided on both sides of the water absorption and drainage layer 3. The evaporator 4 includes a hollow shell 405, a partition 401, and a first water-absorbing geotextile 402. Scaly openings 404 are provided on the outer side wall of the hollow shell 405. The partition 401 is vertically arranged in the hollow shell 405, and a plurality of ventilation holes are provided in the partition 401. One end of the first water-absorbing geotextile 402 is lapped on the water absorption and drainage layer 3, and the other end passes through the hollow shell 405 and the partition 401. A first drain pipe 403 with an internal connection is provided under the hollow shell 405. The evaporator 4 is used to evaporate the water in the water absorption and drainage layer 3. Drainage blind ditches 6 are provided on both sides from the hydrophobic waterproof layer 5 to the second waste residue layer 8. The drainage blind ditches 6 are arranged under the evaporators 4 and are connected to the evaporators 4 through the first drain pipes 403 for discharging the water above the hydrophobic waterproof layer 5. A second drain pipe 10 is provided at the bottom end of the drainage blind ditch 6, and the second drain pipe 10 is connected to a side ditch 9 arranged on both sides of the subgrade.

[0022] The first soil filling layer 1 is filled with coarse-grained materials, which can be crushed stones or gravels. The first waste residue layer 2 is arranged under the first soil filling layer 1. The water absorption and drainage layer 3 is arranged under the first waste residue layer 2. The water absorption and drainage layer 3 includes clay layers with a thickness of 5-10 cm, second water absorption geotextiles, clay layers with a thickness of 5-10 cm, second water absorption geotextiles, and clay layers with a thickness of 5-10 cm, which are arranged in sequence from top to bottom. A hydrophobic waterproof layer 5 is arranged under the water absorption and drainage layer 3. The thickness of the clay layer can be adjusted according to the amount of environmental precipitation. When the environmental precipitation is larger, the clay layer is thicker. The hydrophobic waterproof layer 5 is a polymer waterproof coiled material, which can be an EVA waterproof coiled material, a PE waterproof coiled material or an HDPE waterproof coiled material. A second soil filling layer 7 is arranged under the hydrophobic waterproof layer 5. The second soil filling layer 7 is improved soil, which can be cement-improved soil or lime-improved soil. A second waste residue layer 8 is arranged under the second soil filling layer 7. The first waste residue layer 2 and the second waste residue layer 8 are mixtures of coal combustion waste residues and fly ash, coarse and fine aggregates, cement and polyurethane additives after being shelled with bisphenol A epoxy resin. Evaporators 4 are arranged at both ends of the water absorption and drainage layer 3. The evaporator 4 includes a hollow shell 405, a partition 401 and a first water absorption geotextile 402. The outer side wall of the hollow shell 405 is inclined to facilitate adaptation to the shape of the entire roadbed. Scaly openings 404 are arranged on the outer side wall of the hollow shell 405. A plurality of partitions 401 are arranged vertically and at intervals in the hollow shell 405. A plurality of chutes are arranged on the upper and lower inner side walls of the hollow shell 405. The upper and lower ends of the partition 401 are respectively inserted into the hollow shell 405 through the chutes. The distance between the partitions 401 can also be adjusted by inserting different chutes. A plurality of ventilation holes are arranged on the partition 401. Two first water absorption geotextiles 402 can be provided, and one ends of the two first water absorption geotextiles 402 are both lapped on the two second water absorption geotextiles of the water absorption and drainage layer 3, and the other ends pass through the partition 401 on the side close to the water absorption and drainage layer 3 to the partition 401 on the side close to the scaly opening 404, and the water absorption geotextile 402 is arranged in a serpentine shape on the partition 401. A first drain pipe 403 with an internal connection is arranged under the hollow shell 405. The evaporator 4 is used to evaporate the water discharged from the water absorption and drainage layer 3. Drainage blind ditches 6 are arranged on both sides of the hydrophobic waterproof layer 5 to the second waste residue layer 8. The drainage blind ditches 6 are arranged under the evaporator 4 and are connected to the evaporator 4 through the first drain pipe 403, and are used to discharge the water above the hydrophobic drainage layer 5. A second drain pipe 10 is arranged at the lower end of the drainage blind ditch 6. Side ditches 9 for drainage are arranged outside the bottoms of the drainage blind ditches 6 on both sides outside the roadbed. The second drain pipe 10 is communicated with the side ditch 9. The evaporators 4 are evenly arranged in the length direction of the road. The distance between two adjacent evaporators 4 is 20 m - 50 m. The distance between the intervals of the evaporators 4 is adjusted according to the amount of water. The larger the amount of water, the smaller the interval distance. The drainage blind ditches 6 are arranged under the evaporators 4 and are also evenly arranged in the length direction of the road, and the interval distance is alsoFacilitate the drainage of moisture to both sides.

[0023] Working principle: The moisture on the subgrade surface penetrates through the first filling layer 1 and the first waste residue layer 2 and is absorbed by the water absorption and drainage layer 3. The second water-absorbing geotextile in the water absorption and drainage layer 3 gradually guides the moisture in the center of the subgrade to the first water-absorbing geotextile 402 in the evaporator 4 through capillary action. The first water-absorbing geotextile 402 is arranged in a serpentine shape on the partition 401, which can increase the evaporation area. The moisture will evaporate from the scaly openings 404, and the scaly openings 404 can prevent the moisture from pouring into the evaporator 4 during direct rainfall. If the water volume is too large and exceeds the bearing capacity of the first water-absorbing geotextile 402, it will be drained by the first drain pipe 403 into the drainage blind ditch 6. The drainage blind ditch 6 drains the moisture from the second drain pipe 10 to the side ditch 9 outside the subgrade, and the hydrophobic waterproof layer 5 can prevent the moisture in the water absorption and drainage layer 3 from further seeping down.

[0024] Compared with the prior art, the beneficial effects of the present invention are that evaporators are arranged on both sides of the water absorption and drainage layer, and the moisture is drained into the evaporators through capillary action, accelerating the evaporation rate of the moisture. There are scaly openings on one side of the evaporator, ensuring that the evaporator can not only evaporate the moisture in the water absorption and drainage layer to achieve active drainage, but also ensure that the moisture will not pour in during direct rainfall. By setting the hydrophobic waterproof layer, the moisture in the internal structure is maintained to keep the moisture content.

[0025] The embodiments of the present invention are given for purposes of illustration and description, and are not exhaustive or limit the invention to the disclosed form. Many modifications and variations are obvious to those of ordinary skill in the art. The embodiments are chosen and described in order to better illustrate the principles of the invention and its practical application, and to enable those of ordinary skill in the art to understand the invention and design various embodiments with various modifications suitable for specific purposes.

Claims

1. An active drainage subgrade structure, characterized in that, It includes a first soil filling layer (1), a first waste residue layer (2), a water absorption and drainage layer (3), a hydrophobic waterproof layer (5), a second soil filling layer (7), and a second waste residue layer (8) arranged from top to bottom. Evaporators (4) are provided on both sides of the water absorption and drainage layer (3). The evaporator (4) includes a hollow shell (405), a partition board (401), and a first soil-absorbing geotextile (402). Scaly openings (404) are provided on the outer side wall of the hollow shell (405). The partition board (401) is vertically arranged inside the hollow shell (405), and a plurality of ventilation holes are opened on the partition board (401). One end of the first soil-absorbing geotextile (402) overlaps on the water absorption and drainage layer (3), and the other end passes through the hollow shell (405) and the partition board (401). A first drain pipe (403) with an internal connection is provided under the hollow shell (405). The evaporator (4) is used to evaporate the water in the water absorption and drainage layer (3). Drainage blind ditches (6) are provided on both sides from the hydrophobic waterproof layer (5) to the second waste residue layer (8). The drainage blind ditch (6) is arranged under the evaporator (4) and is connected to the evaporator (4) through the first drain pipe (403) for discharging the water above the hydrophobic waterproof layer (5). A second drain pipe (10) is provided at the bottom end of the drainage blind ditch (6), and the second drain pipe (10) is connected to a side ditch (9) arranged on both sides of the roadbed.

2. The active drainage subgrade structure according to claim 1, characterized in that The number of the partition boards (401) is multiple, and the multiple partition boards (401) are parallel to each other.

3. The active drainage subgrade structure according to claim 2, characterized in that, The first soil-absorbing geotextile (402) passes from the partition board (401) on the side close to the water absorption and drainage layer (3) to the partition board (401) on the side close to the scaly opening (404), and the first soil-absorbing geotextile (402) is arranged in a serpentine pattern on the partition board (401).

4. The active drainage subgrade structure according to claim 1, characterized in that, The first waste residue layer (2), the water absorption and drainage layer (3), the hydrophobic waterproof layer (5), and the second soil filling layer (7) all have a 2% cross slope, and the evaporator (4) has a 3% cross slope.

5. The active drainage subgrade structure according to claim 1, characterized in that, Both the evaporator (4) and the drainage blind ditch (6) are uniformly arranged along the length direction of the road, and the distance between adjacent two evaporators (4) is 20m - 50m.

6. The active drainage subgrade structure according to claim 1, characterized in that, The first soil filling layer (1) is coarse-grained filler.

7. The active drainage subgrade structure according to claim 1, characterized in that, The first waste residue layer (2) and the second waste residue layer (8) are mixtures of coal combustion waste residue and fly ash, coarse and fine aggregates, cement, and polyurethane additives after being shelled with bisphenol A epoxy resin.

8. The active drainage subgrade structure according to claim 1, wherein, The water absorption and drainage layer (3) includes clay layers of 5 - 10 cm, second soil-absorbing geotextiles, clay layers of 5 - 10 cm, second soil-absorbing geotextiles, and clay layers of 5 - 10 cm arranged in sequence from top to bottom, and the first soil-absorbing geotextile (402) overlaps on the second soil-absorbing geotextile.

9. The active drainage subgrade structure according to claim 1, wherein The hydrophobic waterproof layer (5) is a polymer waterproofing membrane.

10. The active drainage subgrade structure according to claim 1, characterized in that, The second soil filling layer (7) is improved soil.

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