Anti-seepage structure of subgrade lower layer surface

Abstract

The utility model discloses an anti-seepage structure of a subgrade lower layer, which relates to the technical field of anti-seepage subgrades and comprises a water-resisting layer laid above a subgrade layer, a waterproof layer laid above the water-resisting layer, a first anti-seepage film laid above the waterproof layer, a first hydrophobic layer laid above the first anti-seepage film, and a second hydrophobic layer laid above the second anti-seepage film. A plurality of first drainage pipelines are arranged between the first impermeable film and the first hydrophobic layer at intervals, second impermeable films are laid on the two sides of the first hydrophobic layer, a second hydrophobic layer is laid on the first hydrophobic layer, and a plurality of second drainage pipelines are arranged between the first hydrophobic layer and the second hydrophobic layer at intervals. Third impermeable films are laid on the two sides of the second hydrophobic layer, and the roadbed upper layer face is laid on the second hydrophobic layer. Compared with the prior art, the anti-seepage structure of the subgrade lower layer surface, provided by the utility model, has the advantages that water can be well discharged from the subgrade lower layer surface and is prevented from being accumulated in the subgrade lower layer surface, so that the anti-seepage treatment of the subgrade lower layer surface is facilitated.

Description

Technical Field

[0001] The utility model relates to the technical field of anti-seepage roadbeds, and specifically relates to an anti-seepage structure for the lower layer of a roadbed. Background Technique

[0002] The lower layer of the roadbed usually refers to the part of the roadbed structure closest to the foundation, also known as the subgrade bottom layer or the base layer. It is a very important part of the roadbed structure because it directly contacts the foundation and undertakes the task of transferring the load of the upper structure to the foundation.

[0003] The patent with the publication number CN217438591U discloses a "tightening anti-scattering and anti-seepage soil and water roadbed structure", which includes a sediment layer. A first PVC geomembrane is laid on the surface of the sediment layer, a dense granite layer is laid on the surface of the first PVC geomembrane, a second PVC geomembrane is laid on the surface of the dense granite layer, an irregular gravel layer is laid on the surface of the second PVC geomembrane, and an asphalt layer is laid on the surface of the irregular gravel layer. In this application, the irregular gravel layer is used as a drainage pipe. The water in the irregular gravel layer cannot continue to penetrate due to the second PVC geomembrane at the bottom. Also due to the slope of the irregular gravel layer, the water in the irregular gravel layer gradually flows to both sides and is then discharged to the surface of the overlying soil layer through a cement cylinder to prevent the overall structure from storing water. The two bottom layers are also protected by the first PVC geomembrane and the second PVC geomembrane, improving the drainage capacity of the structure, so that the bottom layer is less likely to seep water.

[0004] Technologies such as those in the above-mentioned patent can drain the water in the structure. However, the irregular gravel layer results in an irregular distribution of the gravel particle sizes in the irregular gravel layer, which is not conducive to concentrating the water flowing into the gravel layer and discharging it to both sides of the gravel layer, and is not conducive to the anti-seepage treatment of the foundation. Content of the Utility Model

[0005] The purpose of the utility model is to provide an anti-seepage structure for the lower layer of a roadbed to solve the deficiencies in the above-mentioned prior art.

[0006] To achieve the above purpose, the utility model provides the following technical solutions: It includes a water-proof layer laid above the sediment layer, a waterproof layer is laid above the water-proof layer, a first anti-seepage membrane is laid above the waterproof layer, a first hydrophobic layer is laid above the first anti-seepage membrane. A plurality of first drainage pipes are arranged at intervals between the first anti-seepage membrane and the first hydrophobic layer. Second anti-seepage membranes are laid on both sides of the first hydrophobic layer. A second hydrophobic layer is laid above the first hydrophobic layer. A plurality of second drainage pipes are arranged at intervals between the first hydrophobic layer and the second hydrophobic layer. Third anti-seepage membranes are laid on both sides of the second hydrophobic layer. The upper layer of the roadbed is laid above the second hydrophobic layer.

[0007] Furthermore, the water-proof layer is made of dense quartzite.

[0008] Furthermore, the waterproof layer is formed by wrapping the cushion layer with silicone suspension.

[0009] Furthermore, the first anti-seepage membrane, the second anti-seepage membrane, and the third anti-seepage membrane are all polyethylene primary resin anti-seepage membranes.

[0010] Furthermore, drainage holes are provided around the first drainage pipe and the second drainage pipe.

[0011] Furthermore, the first hydrophobic layer includes permeable cement stabilized macadam.

[0012] Furthermore, the particle size of the permeable cement stabilized macadam in the middle part of the first hydrophobic layer is smaller than that in the two side parts of the first hydrophobic layer.

[0013] Furthermore, the second hydrophobic layer includes graded broken stone.

[0014] Furthermore, the particle size of the permeable cement stabilized macadam in the middle part of the second hydrophobic layer is smaller than that in the two side parts of the second hydrophobic layer.

[0015] Compared with the prior art, an anti-seepage structure for the lower layer of a roadbed provided by the present utility model prevents moisture from seeping downward from the roadbed into the foundation and also prevents groundwater from seeping upward into the roadbed through the provided water isolation layer, waterproof layer, and first anti-seepage membrane. At the same time, the provided first drainage pipe, second drainage pipe, first hydrophobic layer, and second hydrophobic layer can well drain the moisture from the lower layer of the roadbed, avoiding the accumulation of moisture in the lower layer of the roadbed, which is beneficial to the anti-seepage treatment of the lower layer of the roadbed. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments recorded in the present utility model. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings.

[0017] Figure 1 is a schematic structural diagram provided by an embodiment of the present utility model;

[0018] Figure 2 is a schematic structural diagram provided by another embodiment of the present utility model.

[0019] Description of the reference numerals:

[0020] 1. Sinking layer; 2. Water isolation layer; 3. Waterproof layer; 4. First anti-seepage membrane; 5. Second anti-seepage membrane; 6. Third anti-seepage membrane; 7. First hydrophobic layer; 8. Second hydrophobic layer; 9. First drainage pipe; 10. Second drainage pipe; 11. Upper layer of the roadbed. Detailed implementation mode

[0021] In order to enable those skilled in the art to better understand the technical solution of the present utility model, the present utility model will be further described in detail below with reference to the accompanying drawings.

[0022] Please refer to Figure 1-2 , an anti-seepage structure for the lower layer of the roadbed provided by the embodiment of the present utility model is arranged between the clay layer 1 and the upper layer 11 of the roadbed, and includes a water-proof layer 2 laid above the clay layer 1. The water-proof layer 2 is made of dense quartzite, which is a kind of stone with high hardness and low water absorption rate, and is suitable as a roadbed layer and a waterproof material. Selecting dense quartzite as the water-proof layer 2 can prevent the groundwater in the clay layer 1 from seeping into the roadbed from bottom to top, causing damage to the roadbed. A waterproof layer 3 is laid above the water-proof layer 2. The waterproof layer 3 is formed by wrapping the cushion layer with an organosilicon suspension. The active genes in the organosilicon suspension react with the silicon oxygen (hydroxyl) groups in the cushion layer to generate a water-repellent coating film around the cushion layer, which can effectively prevent the passage of water and avoid water seeping into the water-proof layer 2 from the upper layer of the cushion layer, or seeping into the waterproof layer 3 from the lower layer of the cushion layer, or seeping into the cushion layer from both sides of the cushion layer.

[0023] A first anti-seepage membrane 4 is laid above the waterproof layer 3. The first anti-seepage membrane 4 is a polyethylene primary resin anti-seepage membrane, which can form an impermeable layer with a high anti-seepage coefficient to block the leakage of water into the waterproof layer 3. At the same time, the polyethylene primary resin anti-seepage membrane has excellent anti-aging, anti-ultraviolet and anti-decomposition capabilities, reducing the later-stage roadbed maintenance cost. A first hydrophobic layer 7 is laid above the first anti-seepage membrane 4. The first hydrophobic layer 7 includes permeable cement stabilized macadam, which combines the stability of cement and the water permeability of macadam, and can improve the road stability while effectively reducing water accumulation.

[0024] The particle size of the permeable cement stabilized macadam in the middle part of the first hydrophobic layer 7 is smaller than that in the two side parts of the first hydrophobic layer 7. In this way, when water flows through the first hydrophobic layer 7, due to the different densities of the permeable cement stabilized macadam in the middle part and the two side parts of the first hydrophobic layer 7, the density of the middle part is greater than that of the two sides, and the water is more likely to flow to the two sides of the first hydrophobic layer 7 to facilitate drainage.

[0025] A plurality of first drainage pipes 9 are arranged at intervals between the first anti-seepage membrane 4 and the first hydrophobic layer 7. The pipe length of the first drainage pipes 9 is laid along the width direction of the first hydrophobic layer 7, and the plurality of first drainage pipes 9 are laid equidistantly along the length direction of the first hydrophobic layer 7. Drainage holes are provided around the first drainage pipes 9 to facilitate the water flowing into the hydrophobic layer to flow through the drainage holes and through the first drainage pipes 9 to the drainage grooves on both sides of the roadbed. Second anti-seepage membranes 5 are laid on both sides of the first hydrophobic layer 7. The material of the second anti-seepage membranes 5 is the same as that of the first anti-seepage membrane 4. Laying the second anti-seepage membranes 5 on both sides of the first hydrophobic layer 7 can prevent the water on both sides of the roadbed or the water discharged from the upper layer 11 of the roadbed from leaking back into the first hydrophobic layer 7 again, causing drainage pressure on the first hydrophobic layer 7.

[0026] A second hydrophobic layer 8 is laid above the first hydrophobic layer 7. The second hydrophobic layer 8 includes graded crushed stones, which are formed by mixing crushed stone particles of different particle sizes in a certain proportion to form a mixture with good engineering properties, improving the road bearing capacity while also improving the water permeability.

[0027] The particle size of the permeable cement stabilized crushed stones in the middle part of the second hydrophobic layer 8 is smaller than that of the permeable cement stabilized crushed stones in the two side parts of the second hydrophobic layer 8. In this way, when water flows through the second hydrophobic layer 8, because the density of the permeable cement stabilized crushed stones in the middle part and the two side parts of the second hydrophobic layer 8 is different, and the density of the middle part is greater than that of the two sides, the water is more likely to flow to the two sides of the second hydrophobic layer 8 to facilitate drainage.

[0028] A plurality of second drainage pipes 10 are arranged at intervals between the first hydrophobic layer 7 and the second hydrophobic layer 8. The pipe length of the second drainage pipes 10 is laid along the width direction of the second hydrophobic layer 8, and the plurality of second drainage pipes 10 are laid equidistantly along the length direction of the second hydrophobic layer 8. Drainage holes are provided around the second drainage pipes 10 to facilitate the water flowing into the hydrophobic layer to flow through the drainage holes and through the second drainage pipes 10 to the drainage grooves on both sides of the roadbed. Third anti-seepage membranes 6 are laid on both sides of the second hydrophobic layer 8. The material of the third anti-seepage membranes 6 is the same as that of the first anti-seepage membrane 4. The third anti-seepage membranes 6 laid on both sides of the second hydrophobic layer 8 can prevent the water on both sides of the roadbed or the water discharged from the upper layer 11 of the roadbed from leaking back into the second hydrophobic layer 8 again, causing drainage pressure on the second hydrophobic layer 8. The upper layer 11 of the roadbed is laid above the second hydrophobic layer 8.

[0029] Please refer to Figure 2 , in which, an interlocking laying method is adopted between the clay layer 1 and the water-resistant layer 2. Similarly, an interlocking laying method is also adopted between the second hydrophobic layer 8 and the upper layer 11 of the roadbed. By interlocking between different levels, the overall stability of the roadbed can be improved, uneven settlement can be reduced, the existence of the interlocking layer can increase the frictional force between layers, reduce interlayer sliding, and improve the stability of the road structure.

[0030] Only some exemplary embodiments of the present utility model are described by way of illustration. Without doubt, for those of ordinary skill in the art, the described embodiments can be modified in various different ways without departing from the spirit and scope of the present utility model. Therefore, the above drawings and description are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present utility model.

Claims

1. An anti-seepage structure of a lower surface of a roadbed, arranged between a subsidence layer (1) and an upper surface (11) of the roadbed, characterized in that: The invention comprises a waterproof layer (2) laid on the top of a subsidence layer (1), a waterproof layer (3) laid on the waterproof layer (2), a first impermeable membrane (4) laid on the top of the waterproof layer (3), a first hydrophobic layer (7) laid on the top of the first impermeable membrane (4), a plurality of first drainage pipes (9) arranged between the first impermeable membrane (4) and the first hydrophobic layer (7), a second impermeable membrane (5) laid on both sides of the first hydrophobic layer (7), a second hydrophobic layer (8) laid on the top of the first hydrophobic layer (7), a plurality of second drainage pipes (10) arranged between the first hydrophobic layer (7) and the second hydrophobic layer (8), a third impermeable membrane (6) laid on both sides of the second hydrophobic layer (8), and the roadbed upper surface (11) laid on the top of the second hydrophobic layer (8).

2. The anti-seepage structure of the lower surface of the roadbed according to claim 1, characterized in that: The waterproof layer (2) is made of quartzite.

3. The anti-seepage structure of the lower surface of the roadbed according to claim 1, characterized in that: The waterproof layer (3) is formed by wrapping the organic silicon suspension around the cushion soil layer.

4. The anti-seepage structure of the lower surface of the roadbed according to claim 1, characterized in that: The first anti-seepage membrane (4), the second anti-seepage membrane (5) and the third anti-seepage membrane (6) are all polyethylene virgin resin anti-seepage membranes.

5. The anti-seepage structure of the lower surface of the roadbed according to claim 1, characterized in that: Drainage holes are provided around the first drainage pipe (9) and the second drainage pipe (10).

Images