Permeable pavement structure suitable for high underground water level area

Abstract

The utility model provides a permeable pavement structure suitable for a high underground water level area, which is a laminated structure and sequentially comprises a soil base layer, an impermeable layer, a drainage base layer, a leveling layer and a permeable surface layer from bottom to top, permeable geotextile is arranged between the drainage base layer and the leveling layer; the drainage base layer is of an assembly type splicing structure and is composed of an assembly type concrete frame with the thickness being 200-300 mm, graded broken stone and a drainage pipe. According to the utility model, infiltrated rainwater in the laminated structure layer can be drained in time, and the effect of reducing the runoff peak value of the permeable pavement is fully exerted; the anti-seepage layer can effectively prevent rainwater runoff from seeping into underground water or underground water from seeping into facilities, so that the risk of polluting the underground water is avoided; and the structure is simple, construction is convenient, and good economical efficiency and practicability are achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of road paving, in particular to a permeable paving structure suitable for areas with high groundwater levels. Background Art

[0002] At present, two types of pavement structures are widely used in residential roads, parking lots, etc. One is to use dense and impermeable concrete pavement. This pavement has a large runoff coefficient and does not have the function of retaining rainwater during rainfall. It has no storage capacity and no reduction.

[0003] The ability of runoff peaks. Rainfall will quickly gather on the pavement surface to produce surface runoff, which will cause great drainage pressure on the urban drainage pipe network system and easily lead to the risk of urban waterlogging. Another type of pavement uses permeable concrete paving. This structure can absorb a certain amount of rainfall and has a certain ability to regulate and reduce flood peaks, but there is no impermeable structure at the bottom. Rainfall directly infiltrates into groundwater, posing a risk of polluting groundwater resources. In addition, for areas with high groundwater levels like Shanghai, groundwater can easily infiltrate into the pavement structure, which will reduce the pavement's regulation capacity and there is a risk of cross-contamination with groundwater.

[0004] Therefore, there is an urgent need to develop a permeable brick paving structure that can both cut off the connection between groundwater and infiltrating rainwater in areas with high groundwater levels and is easy to construct. Summary of the invention

[0005] The technical problem to be solved by the utility model is to provide a permeable pavement structure suitable for areas with high groundwater levels in view of the deficiencies in the above-mentioned prior art. In areas with high groundwater levels, the structure can not only cut off the connection between groundwater and infiltrating rainwater, but also be easy to construct and has good economy and practicality.

[0006] To achieve the above-mentioned purpose, the technical solution adopted by the utility model is as follows: a permeable pavement structure suitable for areas with high groundwater levels, the permeable pavement structure is a stacked structure, which includes, from bottom to top: a soil base layer, an anti-seepage layer, a drainage base layer, a leveling layer, and a permeable surface layer; the drainage base layer is an assembled structure, which is composed of an assembled concrete frame with a thickness of 200-300mm, graded crushed stone and a drainage pipe.

[0007] Furthermore, the compaction degree of the soil base layer is ≥96%.

[0008] Furthermore, the anti-seepage layer adopts a composite geomembrane, and has a two-cloth and two-membrane structure, according to the geotextile 300g / m 2 +HDPE (smooth surface 1mm thick) + geotextile 300g / m 2 + HDPE (smooth surface 1mm thick) type setting.

[0009] Furthermore, the assembled concrete frame includes two clamping grooves and two clamping parts, and the clamping grooves and the clamping parts are arranged relative to each other to form a drainage base layer.

[0010] Furthermore, the assembled concrete frame includes two clamping grooves and two clamping parts, and the clamping grooves and the clamping parts are arranged relative to each other to form a drainage base layer.

[0011] Furthermore, a circular groove for clamping the drain pipe is arranged at the bottom of the assembled concrete frame, and the diameter of the circular groove is slightly larger than the diameter of the drain pipe.

[0012] Furthermore, the drainage pipe is clamped in the circular groove at the bottom of the assembled concrete frame, connected to the nearby rainwater pipe network, and the outer side is wrapped with a permeable geotextile with an opening rate of not less than 4%.

[0013] Furthermore, the crushing value of the graded crushed stone aggregate should not be greater than 26%, and the continuous porosity should not be less than 10%.

[0014] Furthermore, a permeable geotextile is provided between the drainage base layer and the leveling layer to prevent the medium-coarse sand of the leveling layer from clogging the drainage base layer; the permeable geotextile has a unit area mass of 300g / m 2 .

[0015] Furthermore, the water permeability of the leveling layer is not lower than that of the water permeable surface layer, and the thickness thereof is 30-35 mm.

[0016] Furthermore, the permeable surface layer may be made of permeable bricks or permeable concrete.

[0017] As described above, the utility model is a permeable pavement structure suitable for areas with high groundwater levels, which has at least the following beneficial effects: 1. The drainage base layer can collect infiltrated rainwater very well. The rainwater collected by the drainage base layer can be discharged into the downstream rainwater pipe network in time through the perforated drainage pipe, and the water storage space is vacated in time to promote the infiltration of ground rainwater, so as to give full play to the role of the permeable pavement in reducing the peak of runoff. 2. The drainage base layer is composed of an assembled concrete frame with a thickness of 200-300mm and graded crushed stone. This combined structure can ensure that the permeable pavement has both a certain strength and good permeability. 3. The composite geomembrane of the anti-seepage layer is located at the bottom of the drainage base layer, which can well block the connection between groundwater and infiltrated rainwater in the high groundwater level area, and prevent groundwater pollution and groundwater backflow. 4. The permeable surface layer is laid in a simple form, and the drainage base layer is an assembled combined structure, so this permeable pavement structure is convenient to construct and low in cost, and has good practicality and economy. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the structure of the utility model;

[0019] Figure 2 It is a structural schematic diagram of the drainage base layer of the utility model;

[0020] Figure 3 It is a structural schematic diagram of the assembled concrete frame of the utility model;

[0021] In the figure, 1 is a soil base layer, 2 is an anti-seepage layer, 3 is a drainage base layer, 31 is a prefabricated concrete frame, 311 is a clamping groove, 312 is a clamping part, 313 is a circular clamping groove, 32 is a graded crushed stone, 33 is a drainage pipe, 4 is a leveling layer, and 5 is a permeable surface layer. DETAILED DESCRIPTION

[0022] The specific implementation of the utility model is described in detail below with reference to the accompanying drawings.

[0023] See also Figure 1 A permeable pavement structure suitable for areas with high groundwater levels. The permeable pavement structure is a stacked structure, which includes, from bottom to top, a soil base layer 1, an anti-seepage layer 2, a drainage base layer 3, a leveling layer 4, and a permeable surface layer 5.

[0024] Furthermore, the compaction degree of the soil base layer 1 is ≥96%.

[0025] Furthermore, the anti-seepage layer 2 adopts a composite geomembrane, and has a two-cloth and two-membrane structure, according to the geotextile 300g / m 2 +HDPE (smooth surface 1mm thick) + geotextile 300g / m 2 + HDPE (smooth surface 1mm thick) type setting.

[0026] See also Figure 2 The drainage base layer 3 is an assembled structure, which is composed of an assembled concrete frame 31 with a thickness of 300 mm, graded crushed stone 32 and a drainage pipe 33.

[0027] See also Figure 3 The assembled concrete frame 31 includes two clamping grooves 311 and two clamping parts 312, and the clamping grooves 311 and the clamping parts 312 are arranged opposite to each other to form a drainage base layer 3; a circular clamping groove 313 for clamping the drainage pipe 33 is arranged at the bottom of the assembled concrete frame 31, and the diameter of the circular clamping groove 313 is slightly larger than the diameter of the drainage pipe 33; the drainage pipe 33 is clamped in the circular clamping groove 313 at the bottom of the assembled concrete frame 31, connected to the nearby rainwater pipe network, and the outer side is wrapped with a permeable geotextile, and the opening rate is not less than 4%.

[0028] Furthermore, the aggregate crushing value of the graded crushed stone 32 should not be greater than 26%, and the continuous porosity should not be less than 10%.

[0029] Furthermore, a permeable geotextile is provided between the drainage base layer 3 and the leveling layer 4 to prevent the medium-coarse sand of the leveling layer 4 from clogging the drainage base layer 3; the permeable geotextile has a unit area mass of 300g / m 2 .

[0030] Furthermore, the water permeability of the leveling layer 4 is not lower than that of the water permeable surface layer, and the thickness thereof is 30 mm.

[0031] Furthermore, the permeable surface layer 5 may be made of permeable concrete.

[0032] Since the improved pavement structure has an impermeable layer 2, it can effectively prevent rainwater runoff from infiltrating into groundwater or groundwater from infiltrating into facilities, thus avoiding the risk of groundwater pollution; the improved pavement structure has a good site hydrological effect. According to statistics of rainfall events that occurred throughout 2022, compared with traditional concrete pavement, the annual runoff control rate of the structure in 2022 was 34.5%, and the rainfall that the structure can directly control is about 9.5mm. That is, compared with traditional concrete pavement, the structure can reduce surface runoff by 34.5% in one year of operation. For rainfall below 9.5mm, the structure can completely retain and store it without outflow.

[0033] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the technology may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed in the present invention shall still be covered by the claims of the present invention.

Claims

1. A permeable pavement structure suitable for areas with high groundwater levels, characterized in that: The permeable pavement structure is a stacked structure, which includes, from bottom to top, a soil base layer, an anti-seepage layer, a drainage base layer, a leveling layer, and a permeable surface layer; the drainage base layer is an assembled structure, which is composed of an assembled concrete frame with a thickness of 200-300mm, crushed stone and a drainage pipe.

2. A permeable pavement structure suitable for areas with high groundwater levels according to claim 1, characterized in that The compaction degree of the soil base layer is ≥96%.

3. The permeable pavement structure suitable for areas with high groundwater levels according to claim 1, characterized in that: The anti-seepage layer adopts a composite geomembrane, and has a two-cloth and two-membrane structure, and is arranged in the form of geotextile 300g / m2+HDPE+geotextile 300g / m2+HDPE.

4. The permeable pavement structure suitable for areas with high groundwater levels according to claim 1, characterized in that: The assembled concrete frame comprises two clamping grooves and two clamping parts, and the clamping grooves and the clamping parts are arranged opposite to each other to form a drainage base layer.

5. The permeable pavement structure suitable for areas with high groundwater levels according to claim 1, characterized in that: A circular groove for clamping the drainage pipe is arranged at the bottom of the prefabricated concrete frame, and the diameter of the circular groove is slightly larger than the diameter of the drainage pipe; the drainage pipe is clamped in the circular groove at the bottom of the prefabricated concrete frame and connected to the nearby rainwater pipe network, and the outer side is wrapped with a permeable geotextile, and the opening rate is not less than 4%.

6. The permeable pavement structure suitable for areas with high groundwater levels according to claim 1, characterized in that: A permeable geotextile is provided between the drainage base layer and the leveling layer to prevent the medium-coarse sand of the leveling layer from clogging the drainage base layer; the permeable geotextile has a unit area mass of 300g / m 2 .

7. The permeable pavement structure suitable for areas with high groundwater levels according to claim 1, characterized in that: The water permeability of the leveling layer is not lower than that of the water permeable surface layer, and the thickness thereof is 30-35 mm.

8. The permeable pavement structure suitable for areas with high groundwater levels according to claim 1, characterized in that: The permeable surface layer can be made of permeable bricks or permeable concrete.

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