Pavement structure suitable for underground water drainage in humid area

Abstract

The utility model discloses a pavement structure suitable for underground water drainage in a humid area, the pavement structure sequentially comprises an asphalt mixture pavement sealing layer, a middle permeable layer and a base layer from top to bottom, the middle permeable layer is provided with drainage pipes along two transverse ends of a pavement, and the drainage pipes can drain underground water from the base layer out of a roadbed; the water inlet end and the water outlet end of the drainage pipe are flared openings; the drainage pipe is arranged on the middle permeable layer, so that underground water seepage can be quickly drained and dredged, water damage to roads in high-humidity and underground water-rich areas is reduced, and the service life of the roads is prolonged.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of pavement structures, more specifically to a kind of pavement structure suitable for groundwater drainage in humid area. BACKGROUND

[0002] The exposed environment of highway tunnel located in mountainous area has the characteristics of high humidity and abundant groundwater. In particular, the presence of groundwater can penetrate the concrete lining into the road structure, resulting in a significant reduction in the strength and stiffness of the subgrade and pavement. In addition to repeated vehicle loads, water-induced road cracks, depressions, broken boards, broken corners and other damages are common in highway tunnels. Currently, the general solution is to use pervious concrete to solve the problem of water infiltration from above the road. Most pervious concrete is used in places with low strength requirements such as sidewalks. The main ways to solve the problem of groundwater damage are: moving the subgrade working layer away from the groundwater level; artificially lowering the groundwater level; and setting artificial obstacles to prevent groundwater from wetting the subgrade. Among them, using effective drainage works to intercept or reduce groundwater is a common solution. Commonly used drainage works include horizontal drainage layer, seepage ditch and open drainage ditch. Seepage ditches are divided into horizontal, vertical and mixed types. Horizontal seepage ditches are water pipes or water holes with water holes, a slope towards the catchment area, and surrounding seepage materials. However, the above methods are not ideal for roads in high-humidity and groundwater-rich areas, especially under repeated vehicle loads.

[0003] Therefore, there is a need for a pavement structure suitable for high-humidity and groundwater-rich areas that has good groundwater drainage effect, reduces the impact and damage of groundwater on the road subgrade and pavement. SUMMARY

[0004] Therefore, the purpose of the utility model is to provide a pavement structure suitable for groundwater drainage in humid areas, which can quickly drain groundwater and reduce water damage to roads in high-humidity and groundwater-rich areas, prolonging the service life of the road.

[0005] The pavement structure suitable for groundwater drainage in humid areas of the utility model comprises, from top to bottom, an asphalt mixture pavement seal layer, an intermediate pervious layer and a base layer. The intermediate pervious layer is provided with a drainage pipe at both ends of the pavement transversely to drain groundwater from the base layer to the outside of the subgrade. The water inlet end and the water outlet end of the drainage pipe are both flared.

[0006] Further, the drainage pipe is a straight structure, and the inner cavity of the drainage pipe is composed of a middle straight pipe-shaped inner cavity and flared inner cavities connected to both ends of the middle straight pipe-shaped inner cavity.

[0007] Further, the drainage pipe is arranged on the middle water-permeable layer and is used for receiving water flowing out from the drainage pipe.

[0008] Further, the curb is arranged on both sides of the drainage pipe along the asphalt mixture pavement.

[0009] Further, the middle water-permeable layer is phosphogypsum-based concrete, and the base layer is phosphogypsum stabilized gravel.

[0010] Further, the drainage pipe is uniformly distributed along the road.

[0011] Further, the interval between the drainage pipes is 18-22 cm.

[0012] The pavement structure of the utility model is suitable for underground water drainage in humid areas, the drainage pipe arranged on the middle water-permeable layer can quickly drain the underground seepage water, dredge the underground seepage water, reduce water damage to roads in high-humidity and rich-underground-water areas, and prolong the service life of the road. BRIEF DESCRIPTION OF DRAWINGS

[0013] The utility model will be further described in connection with the drawings and embodiments:

[0014] Figure 1 It is the structure schematic view of the utility model;

[0015] Figure 2 It is the drainage pipe structure schematic view of the utility model. DETAILED DESCRIPTION

[0016] Figure 1 It is the structure schematic view of the utility model; Figure 2The utility model discloses a drainage pipe 7 structure schematic view. As shown in the drawing, the road surface structure suitable for the underground water drainage of humid area of the embodiment, the road surface structure comprises asphalt mixture road surface seal layer 1, intermediate water permeable layer 2 and base layer 3 from top to bottom in proper order, the intermediate water permeable layer 2 is provided with drainage pipe 7 along the both ends of road surface transverse direction and can discharge the underground water seepage from base layer 3 to roadbed, the water inlet end and the water outlet end of drainage pipe 7 are all flared, the asphalt mixture road surface seal layer 1 is conventional asphalt pavement layer, can effectively prevent the percolation of rainwater, the intermediate water permeable layer 2 has good drainage, through the drainage pipe 7 provided in the intermediate water permeable layer 2, the underground water seepage from bottom base layer 4 can be discharged quickly, the underground water seepage is dredged, the water damage to the road of high humidity and rich underground water area is reduced, and the service life of road is prolonged. Drainage pipe 7 is arranged at the both ends of the transverse direction (width direction) of road and is in a row along the longitudinal direction (length direction) of road, and the middle of road is without drainage pipe 7, so as not to be affected by vehicle load, and the integrity and the strength of road structure are not influenced, and drainage pipe 7 is basically not affected by vehicle load. The water inlet of drainage pipe 7 is located in the intermediate water permeable layer 2, the water outlet is located in the inside and outside of the intermediate water permeable layer 2, and is arranged as far as possible along the bottom of the intermediate water permeable layer 2, and the structure of drainage pipe 7 is favorable for the quick discharge of water in the intermediate water permeable layer 2.

[0017] In the embodiment, the drainage pipe 7 is a straight structure, the inner cavity of the drainage pipe 7 is composed of a middle straight pipe-shaped inner cavity 701 and flared inner cavities 702 communicated with both ends of the middle straight pipe-shaped inner cavity 701, and the drainage pipe 7 has a straight structure and can be circular or rectangular. Preferably, the circular structure is adopted. The drainage pipe 7 has a hollow inner cavity, both ends are flared inner cavities, and the middle is connected with a straight pipe-shaped inner cavity. The drainage pipe 7 with the structure is installed in the road structure and does not affect the road structure, and can ensure that the drainage pipe 7 can quickly drain water.

[0018] In the embodiment, drainage culverts 6 are arranged on both sides of the intermediate water permeable layer 2 along the longitudinal direction of the road surface and are used for receiving water flowing out of the drainage pipe 7, the drainage culverts 6 are arranged on both sides of the intermediate water permeable layer 2, the outlet end of the drainage pipe 7 is arranged corresponding to the drainage culvert 6, underground water seepage of the intermediate water permeable layer 2 is discharged into the drainage culvert 6 through the drainage pipe 7, and is discharged through the drainage culvert 6.

[0019] In the embodiment, curb stones 5 are arranged on both sides of the asphalt mixture road surface seal layer 1 along the drainage culvert 6, the curb stones 5 are arranged on both sides of the road surface seal layer 1, and the drainage culvert 6 is below the curb stones 5.

[0020] In the embodiment, the intermediate water-permeable layer 2 is phosphogypsum-based concrete, and the base layer 3 is phosphogypsum-stabilized gravel; the phosphogypsum-based concrete is a conventional concrete material mixed with phosphogypsum as a cementitious material, which is an existing material, such as phosphogypsum slag cement concrete, which combines the latent cementitious properties of phosphogypsum and the activity of slag, thereby not only reducing the production cost but also realizing the resource utilization of industrial waste. The base layer 3 is a phosphogypsum-based cementitious material stabilized gravel mixture, which is also an existing material, and is a cement-phosphogypsum stabilized gravel material formed by replacing part of the fine aggregate with phosphogypsum, thereby fully utilizing the solid waste phosphogypsum to realize the recycling of resources and achieve the purpose of low carbon and environmental protection. In order to withstand high flow load, the water-permeable concrete must have a compressive strength and a permeability coefficient of more than 25 MPa and 15 mm / s, respectively. Although increasing the porosity can improve the permeability of the water-permeable concrete, the compressive strength is reduced. Therefore, it is beneficial to solve the road structure damage caused by groundwater in the tunnel road by increasing the strength of the cementitious material to obtain suitable water-permeable concrete. Moreover, the water-permeable phosphogypsum-based concrete layer and the phosphogypsum-based cementitious material stabilized gravel mixture base layer 3 can fully utilize the solid waste phosphogypsum to realize the recycling of resources and achieve the purpose of low carbon and environmental protection.

[0021] In the embodiment, the drainage pipes 7 are uniformly distributed along the road. The drainage pipes 7 are arranged in a row along the length direction of the road, and the spacing between the drainage pipes 7 is 18-22 cm. If the spacing is too large, it is not conducive to draining the water in the intermediate water-permeable layer 2, and if the spacing is too small, it may affect the road layer structure. Therefore, the spacing of the drainage pipes 7 is 18-22 cm, which is appropriate and does not affect the drainage, the strength of the structure layer, and the integrity of the structure layer. The diameter of the drainage pipes 7 is required to be not more than 1 / 2 of the thickness of the intermediate water-permeable layer 2.

[0022] Finally, it should be pointed out that the above embodiments are only used to illustrate the technical solutions of the present application and are not limiting. Although the present application has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present application can be modified or replaced equivalently without departing from the spirit and scope of the present application, and all should be covered in the scope of the claims of the present application.

Claims

1. A road surface structure suitable for groundwater drainage in humid areas, characterized in that: The road structure consists of an asphalt mixture pavement seal layer, an intermediate permeable layer, and a base layer from top to bottom. The intermediate permeable layer is equipped with drainage pipes at both ends of the road surface to discharge underground seepage water from the base layer to the outside of the roadbed. Both the inlet and outlet ends of the drainage pipes are flared.

2. The road surface structure for groundwater drainage in humid areas according to claim 1, characterized in that: The drain pipe has a straight structure, and its inner cavity consists of a central straight tubular inner cavity and flared inner cavities connecting the two ends of the central straight tubular inner cavity.

3. The road surface structure for groundwater drainage in humid areas according to claim 1, characterized in that: Drainage culverts are provided on both sides of the road surface along the longitudinal direction, corresponding to the two ends of the middle permeable layer, to receive water flowing out of the drainage pipe.

4. The road surface structure for groundwater drainage in humid areas according to claim 3, characterized in that: Curbstones are installed on both sides of the asphalt mixture pavement seal layer above the drainage culvert.

5. The road surface structure for groundwater drainage in humid areas according to claim 1, characterized in that: The intermediate permeable layer is phosphogypsum-based concrete, and the base layer is phosphogypsum-stabilized crushed stone.

6. The road surface structure for groundwater drainage in humid areas according to claim 1, characterized in that: The drainage pipes are evenly distributed along the road.

7. The road surface structure for groundwater drainage in humid areas according to claim 6, characterized in that: The spacing between the drain pipes is 18-22cm.

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