CN101624839A - Method for comprehensively discharging accumulated water of underpass roads by filtering infiltration pond - Google Patents

Abstract

A method for comprehensively removing accumulated water from an underpassing road in a filter infiltration tank, comprising setting a water collection well (4) under the side ditch (3) on both sides of the road where the main road (1) and the crossed road (2) intersect, and the side of the well is Establish a permeation tank (6), and the two are connected with drainpipe (5). A permeation well (10) is provided in the pool to pass through the bottom of the pool, the entrance of the permeation well (10) is covered with a filter screen (8), the well wall is provided with holes, the net is covered with a filter layer (7), and the lower well body is surrounded by a filter layer (7). The bottom of the infiltration tank (6) is also a filter layer (7), the lower end is filled with a layer of sandstone (9), and the periphery of the end is successively downwards a water-repelling layer (12) and a water-permeable soil layer (13). The installation is simple and the design is reasonable. When the groundwater level is low, the surface runoff rainwater can penetrate into the shallow and deep underground permeable soil layers through decontamination treatment, quickly discharge sewage and replenish groundwater, and is economical and environmentally friendly.

Description

A Method for Comprehensively Removing Water from Underpass Roads by Filtering Infiltration Tanks

technical field

The invention belongs to the technical field of highway engineering, and in particular relates to a drainage method suitable for underpassed roads after the expressway embankment is lowered—a method for comprehensively removing accumulated water on underpassed roads by using a filter infiltration pool.

Background technique

In order to reduce the filling height of expressway embankment and at the same time ensure that the ground rainwater collected by the underpass road can be discharged in time when it is large, and it will not affect the normal traffic of the road under normal rainfall intensity, the commonly used drainage methods are mainly rain Shed drainage, evaporation pond drainage and seepage pit or ditch drainage and other methods. Among them, the main defect of the canopy drainage is that the waterproof material used is easy to age, the cost is high when the area is large, the replacement and maintenance costs of the canopy are relatively high, and this method is likely to cause water accumulation on the underpass road; the main defect of evaporation pond drainage It occupies a lot of land, and the cost is relatively high, and it cannot meet the drainage requirements during heavy rains, and it is easy to cause water accumulation on the road below; while the seepage pit or ditch drainage method has a certain interception and percolation purification effect on the runoff of the road surface. However, when the catchment area of the underpass road is large, the drainage is slow, especially in the event of heavy rain, the underpass road is prone to water accumulation, and may pollute the surrounding environment and groundwater.

Contents of the invention

The technical problem to be solved by the present invention is to provide a method for comprehensively removing the accumulated water of the underpass road in the filtering infiltration pool in view of the deficiencies in the prior art. When it is larger, the surface runoff rainwater passing through the road can be collected and decontaminated. It can not only infiltrate into the shallow permeable soil layer through the infiltration tank, but also penetrate into the deep underground permeable soil layer through the infiltration well, and replenish groundwater. So as to obtain better social economic and environmental benefits.

The solution of the present invention is that the method for comprehensively removing the accumulated water in the underpass road by the filter infiltration tank, referring to Fig. 1, is under the side ditch 3 or under the dark ditch on both sides of the intersection between the main road line 1 and the underpass road 2 Set up a collection well 4. An infiltration pool 6 is established in the permeable soil layer above the groundwater level on the sides of the water collection well 4 . A permeation well 10 is arranged in the permeation tank 6 and passes through the bottom of the tank. One end of the entrance of the permeation well 10 protruding upwards from the bottom of the pool is covered with a filter screen 8 . Holes are arranged on the wall of the part of the permeation well 10 protruding upward from the bottom of the pool, and the area of the holes is not less than 30% of the area of the wall of the part of the permeation well 10 protruding upward from the bottom of the pool. The top of the filter screen 8 is covered with a filter layer 7, and the periphery of the permeation well 10 well body below the filter screen 8 is also surrounded by a layer of filter layer 7, and the bottom of the above-mentioned permeation tank 6 is also a layer of filter layer 7. A layer of sandstone 9 is filled around the lower well body of the infiltration well 10 passing through the bottom of the pool. The periphery of the lower end of the infiltration well 10 is a water-resisting layer 12 and a water-permeable soil layer 13 downwards in sequence. The infiltration well 10 stretches to the water-permeable soil layer 13 through the water-resisting layer 12, and the permeable well 10 passes through the water-repelling layer 12 and stretches to the water-permeable soil layer 13. Holes are arranged on the well wall of a section of the well body, and the hole area is not less than the permeable soil layer. The well 10 passes through 30% of the well wall area of a section of the well body under the water-resisting layer 12, and a layer of water-resisting clay ball layer 11 is filled around the well body of the water-resisting layer section. A layer of sand mesh 14 is surrounded on the well wall of a section of well body under the aquifer 12 in the permeable well 10 . Use a drainage pipe 5 to connect the water collection well 4 and the osmosis tank 6, utilize the vermiculite filter layer 7 and the filter screen 8 in the osmosis tank 6 to remove the above-mentioned side ditch 3 or dark ditch and Suspended solids, ammonia nitrogen, and heavy metal ions in the infiltration pool are obtained by comprehensive infiltration and discharge of purified rainwater.

When the method of filtering and permeating tank of the present invention comprehensively eliminates the accumulated water in the lower crossing road is put into use, its water collecting well 4 is placed under the side ditch 3 or under the dark ditch, and the bottom of the permeating tank 6 is placed in the permeable soil layer above the groundwater level. The two are connected with a drainpipe 5 so that the surface runoff rainwater accumulated in the side ditch 3 or the dark ditch can flow into the sump 4, then flow into the infiltration tank 6 through the drainpipe 5, and then filter through the infiltration tank 6. Layer 7 and filter screen 8 are filtered layer by layer to filter out the pollutants in the runoff on the road surface, and then infiltrate the shallow permeable soil layer through the bottom of the infiltration tank, and at the same time discharge the rainwater that has undergone the above purification treatment through the infiltration well 10 to the deep permeable soil layer in a osmotic manner .

The beneficial effects of the present invention are that the method for comprehensively removing the accumulated water from the underpass road through the filtration and infiltration tank has been proved to be reasonable in design and simple in setting, and can make the surface runoff rainwater of the underpass road collect and be decontaminated after being collected. When the groundwater level is low (deep), it penetrates into the shallow permeable soil layer and the deep underground permeable soil layer through the infiltration tank and the infiltration well at the same time, quickly removes and eliminates the pollutants in the rainwater, and replenishes the groundwater, so it is used in road construction. Very easy to promote the application. The method has the characteristics of good effect, quick effect, less investment, environmental protection and economy, and can obtain good social, economic and environmental benefits.

Description of drawings

Fig. 1 is a schematic diagram of the implementation state of a specific embodiment of the present invention, marked as:

1- the main line of the road, 2- the handed over road,

3-side ditch, 4-collection well,

5-drain pipe, 6-infiltration tank,

7-filter layer, 8-filter,

9-sandstone, 10-infiltration well,

11-clay ball layer, 12-water barrier layer,

13-permeable soil layer, 14-sand net,

15- water barrier.

Detailed ways

Embodiment 1, referring to FIG. 1 , in this embodiment, the water collection well 4 is arranged under the side ditch 3 on both sides of the intersection between the main road line 1 and the underpassed road 2 . The infiltration tank 6 adopts reinforced concrete construction, and is located in the permeable soil layer above the groundwater level on the sides of the water collection well 4. The bottom of the osmosis tank 6 is a filter layer 7 back cover, and the coaxial line in the cavity of the osmosis tank 6 is set downward in the center of a permeation well 10 whose pipe diameter is a steel pipe material of ￠10cm. Commercially available common steel wire mesh is used as the filter screen 8 to cover the entrance of the upper end of the infiltration well 10. The part of the infiltration well 10 protruding upward from the bottom of the pool is 1m high, and holes are arranged on the well wall. 30% of the well wall area at the bottom. A layer of filter layer 7 is covered above the filter screen 8 , and the periphery of the permeation well 10 below the filter screen 8 is also surrounded by a layer of filter layer 7 . The filter layer 7 is a commercially available common vermiculite grid with a specification of 2m×2m×1.5m. This grating consists of layers of vermiculite grids filled with vermiculite granules inside. The infiltration well 10 passes through the lower end of the pool bottom, and a layer of sandstone 9 is filled around the well body. The periphery of the lower end of the infiltration well 10 is a water-resisting layer 12 and a water-permeable soil layer 13 downwards in sequence, that is, the infiltration well 10 passes through the water-resisting layer 12 and extends to the water-permeable soil layer 13, and the infiltration well 10 passes through a section under the water-resisting layer 12 Holes are arranged on the well wall of the well body, and the hole area is not less than 30% of the well wall area of a section of the well body that the permeable well 10 passes through the water-resisting layer 12, and a layer of water-resisting clay ball layer 11 is filled around the well body. A layer of sand net 14 is surrounded on the well wall of a section of the well body under the aquifer 12 in the infiltration well 10, and the sand net 14 adopts a commercially available common steel wire net with an aperture of ￠1 mm. The drainage pipe 5 connects the lower part of the water collection well 4 and the permeation tank 6 . The drainage pipe 5 connecting the water collection well 4 and the infiltration tank 6 also adopts a reinforced concrete material with a pipe diameter of ￠70cm. In order to avoid excessive pollutants, especially solid pollutants, pouring into the side ditch 3 or the dark ditch, a water retaining wall 15 is built on both sides of the side ditch 3 or the dark ditch.

In Embodiment 2, the water collection well 4 is arranged under the dark ditch on both sides of the crossing road between the main road line 1 and the underpassing road 2 . The permeation tank 6 adopts corrugated pipe construction, and is also located in the permeable soil layer above the groundwater level on the side of the water collection well 4. Others are with embodiment 1.

The method for comprehensively removing accumulated water in the underpass road by the filtration and permeation tank of the present invention has been proved to have a good drainage effect through multiple tests on the Hengshui-Daming section of Hebei, China's Daguang Expressway, and has fully met the design requirements, and is especially suitable for low groundwater levels. However, when the water catchment of the underpass road is relatively large, the net sewage discharge rate is as high as more than 95%, which has really achieved good social, economic and environmental benefits.

Claims (2)

1, a kind of method of comprehensively discharging accumulated water of underpass roads by filtering infiltration pond, this method is to be divided into a collecting well (4) at road main line (1) and underpass type by the cross way both sides gutters (3) of dealings road (2) or covered conduit, establish an osmotic cell (6) in the permeable ground on collecting well (4) the side groundwater table, establishing an infiltration well (10) in this osmotic cell (6) is passed down through at the bottom of the pond, inlet one end cap that infiltration well (10) protrudes upward at the bottom of the pond is put a screen pack (8), cloth hole on the part borehole wall at the bottom of infiltration well (10) protrudes upward the pond, hole area is not less than described infiltration well (10) and protrudes upward 30% of part borehole wall area at the bottom of the pond, screen pack (8) top covers one deck filtration beds (7), infiltration well (10) the well body periphery of screen pack (8) below is also around one deck filtration beds (7), also one deck filtration beds (7) at the bottom of the pond of above-mentioned osmotic cell (6), the lower end well body periphery that infiltration well (10) passes at the bottom of the pond is filled one deck sandstone (9), infiltration well (10) termination, lower end periphery is downwards water barrier (12) and permeable ground (13) successively, infiltration well (10) passes water barrier (12) and stretches to permeable ground (13), infiltration well (10) passes cloth hole on the borehole wall of one section well body under the water barrier (12), hole area also be not less than described infiltration well (10) pass one section well body under the water barrier (12) borehole wall area 30%, at water proof interval well body periphery around filling one deck roof clay ball layer (11), pass on the borehole wall of one section well body under the water barrier (12) around one deck sand net (14) at infiltration well (10), use a gutter (5) to connect described collecting well (4) and described osmotic cell (6), utilize filtration beds (7), screen pack (8) is removed the infiltration of must purifying waste water of pollutant in above-mentioned gutter (3) or covered conduit and the osmotic cell and is discharged.

2, the method for comprehensively discharging accumulated water of underpass roads by filtering infiltration pond according to claim 1 is characterized in that, builds on the both sides furrow dam of described gutter (3) or french drain and builds one deck dash low bank between fields (15).

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