CN111305362B - A structure of park road infiltration layer based on initial rainwater interception and purification - Google Patents

Abstract

The invention relates to a structure of a park road infiltration layer based on initial rainwater interception and purification, and belongs to the technical field of sponge city construction. The primary rainwater treatment room is built under the sidewalk, and the filter layer, seepage channel, and rainwater retention layer are built under the asphalt road; The overflow pipe and the sand pumping pipe leading to the ground. The primary rainwater treatment room is provided with a buoyancy control switch and a mud baffle. Under the control of the buoyancy control switch, the mud baffle guides the rainwater in the primary rainwater treatment room into the overflow pipe or seepage channel. ; A filter layer, a seepage channel and a rainwater retention layer are arranged in sequence under the asphalt road, and the rainwater retention layer is connected with a reservoir. The beneficial effects of the invention are: when the rainfall is small, precipitation and infiltration are carried out; when the rainfall is large, the rainwater flows into the seepage channel for infiltration treatment; when the rainfall is too large, the latter rainwater is guided to be discharged into the urban drainage system.

Description

A structure of park road infiltration layer based on initial rainwater interception and purification

technical field

The invention relates to a structure of a park road infiltration layer based on initial rainwater interception and purification, and belongs to the technical field of sponge city construction.

Background technique

Initial rain generally refers to the precipitation that has formed surface runoff with a thickness of 10-15mm on the ground. In the early stage of precipitation, the rainwater dissolves a large amount of acidic gases, factory waste gas and other polluting gases in the air. After landing on the ground, due to the scouring effect of the initial rainwater, the early rainwater contains more heavy metals, nutrients, organic matter, suspended particles, Pollutants such as PAHs have a high degree of pollution. The initial rainwater is generally collected by the rainwater drainage system and directly discharged into the natural receiving water body, causing very serious pollution to the water body. The treatment of early rainwater is of great significance to maintaining the safety of the water environment and a good water ecological environment.

At present, my country's primary rainwater treatment technologies mainly include diversion and drainage technology and initial rainwater abandonment technology. The diversion system drainage technology, that is, a diversion device is installed on the rainwater drainage system to divert the initial rainwater to the sewage pipe, and then transport it to the sewage treatment plant, while the latter rainwater is directly discharged into the water body. However, it causes a load impact on the operation of the sewage treatment plant and increases the difficulty of operation. And because two sets of pipelines are laid, the investment is large and the construction is difficult. The initial rainwater abandonment device relies on the impact force or electric power of the rainwater to switch on and off according to the rainfall duration or flow rate. In short, the current promotion and application of initial rainwater treatment technology is not ideal.

SUMMARY OF THE INVENTION

In order to overcome the shortcomings of the above-mentioned prior art, the present invention provides a structure of a park road infiltration layer based on the interception and purification of initial rainwater, which intercepts and purifies the initial rainwater under the road and the sidewalk, and utilizes the initial rainwater as a resource. Conserve water resources.

The present invention is achieved through the following technical solutions: a structure of a park road infiltration layer based on initial rainwater interception and purification, which is characterized in that: it includes a primary rainwater treatment room established under the sidewalk and a filter layer constructed under the asphalt road, seepage water channel, rainwater retention layer;

The primary rainwater treatment chamber includes a top gravel layer and a first infiltration layer at the bottom. A permeable geotextile layer is arranged above the first infiltration layer. The primary rainwater treatment chamber is provided with a water inlet on the asphalt road, and the water inlet is provided with a water inlet. The grille, the primary rainwater treatment room is also provided with an overflow pipe leading to the urban rainwater pipe and a sand pumping pipe leading to the ground, and the primary rainwater treatment room is provided with a buoyancy control switch and a mud baffle. The rainwater in the primary rainwater treatment room is introduced into the overflow pipe or the seepage channel; the filter layer, the seepage channel and the rainwater retention layer are sequentially arranged under the asphalt road, and the rainwater retention layer is connected with a reservoir.

The buoyancy control switch includes a support column, a special bearing, a waterproof plate, a waterproof sling, a rubber airbag and a hard plastic net. On the board, the sum of the length of the waterproof sling and the height of the rubber airbag is less than the height of the support column.

The water seepage channel is a water pipe with a square cross section, and there is no pipe wall below the water pipe, which is used for rainwater infiltration. Below the water seepage channel is a water permeable geotextile layer, the water seepage channel is inclined, and the lowest end of the water seepage channel is connected to sand pumping. Tube.

The water seepage channel is arranged in the filter layer, and a permeable concrete plate is also arranged between the lower part of the filter layer and the rainwater retention layer.

A third infiltration layer is arranged under the permeable geotextile layer at the bottom of the first infiltration layer and the rainwater retention layer.

The first infiltration layer is formed by mixing quartz sand and gravel in a ratio of 1:3, the first infiltration layer is in the shape of a slope, and the horizontal angle is 15°.

The filter layer is composed of hematite, activated carbon and quartz sand mixed in a ratio of 3:1:6.

The third percolation layer is composed of zero-valent iron, activated carbon and soil mixed in a ratio of 1:2:7.

The beneficial effects of the present invention are: (1) adopting the initial rainwater in-situ treatment technology, avoiding the shortcoming that two sets of pipelines need to be laid in the segregated drainage system and the rainwater is directly discharged after being transported to the sewage treatment plant for treatment, preventing the sewage treatment plant from running under load , reduce the operating costs of sewage treatment plants. (2) Small limitations, no dependence on rain and no need for energy such as electricity. When the rainfall is small, precipitation and infiltration are carried out; when the rainfall is large, the rainwater flows into the seepage channel for infiltration treatment; when the rainfall is too large, the rubber airbag receives water The buoyancy effect, overturning and supporting the waterproof board, guiding the later rainwater to flow into the overflow outlet, and directly into the urban drainage system. (3) Easy maintenance and management, not easy to block. The existing technology for the treatment of initial rainwater generally has the problem of siltation and blockage of the pipeline, and it is extremely difficult to maintain in the later stage. Because of the unique structure of the invention, the sediment is accumulated in the sand extraction port, and the maintenance personnel can carry the sand pump to extract the sediment. (4) The treatment effect is good, and the filter layer can remove pollutants such as heavy metals, nutrients, organic matter and suspended particles in the initial rainwater, and prevent the pollution of the water body by the initial rainwater. (5) Resource utilization of rainwater, the present invention stores the treated initial rainwater in a reservoir, which is convenient for later use.

Description of drawings

The present invention will be further described below according to the accompanying drawings and embodiments.

Fig. 1 is the structural representation of the present invention;

Fig. 2 is the top schematic view of the present invention;

3 is a schematic diagram of the primary rainwater treatment chamber of the present invention when the rainfall is too large.

Detailed ways

As shown in Figures 1 to 3, the structure of a park road infiltration layer based on initial rainwater interception and purification is characterized in that: it includes a primary rainwater treatment room 2 established under the sidewalk 1 and a filter layer built under the asphalt road 3. 4. Water seepage channel 5, rainwater retention layer 6;

The primary rainwater treatment chamber 2 includes a top gravel layer 21 and a first percolation layer 22 at the bottom. A permeable geotextile layer 23 is provided above the first percolation layer 22. The primary rainwater treatment chamber 2 is provided with an inlet on the asphalt road 3. The water inlet 24, the water inlet 24 is provided with a grille, the primary rainwater treatment room 2 is also provided with an overflow pipe 25 leading to the urban rainwater pipe and a sand pumping pipe 26 leading to the ground, and the primary rainwater treatment room 2 is provided with a buoyancy control switch 27 and the mud baffle 28, the mud baffle 28 is controlled by the buoyancy control switch 27, and the rainwater in the primary rainwater treatment chamber 2 is introduced into the overflow pipe 25 or the seepage channel 5;

A filter layer 4 , a water seepage channel 5 and a rainwater retention layer 6 are sequentially arranged below the asphalt road 3 , and the rainwater retention layer 6 is connected with a reservoir 7 .

The buoyancy control switch 27 includes a support column 271, a special bearing 272, a waterproof plate 273, a waterproof sling 274, a rubber air bag 275 and a hard plastic mesh 276. The special bearing 272 is connected to the support column 271 and the waterproof plate 273, The waterproof sling 274 hangs the rubber air bag 275 on the waterproof plate 273. The sum of the length of the waterproof sling 274 and the height of the rubber air bag 275 is less than the height of the support column 271. The mud baffle 28 is arranged on the waterproof plate 273 near the water inlet 24. On one side, a rigid plastic mesh 276 surrounds the rubber bladder 275 .

The water seepage channel 5 is a water pipe with a square cross-section, and there is no pipe wall below the water pipe, which is used for rainwater infiltration. The lowest end is connected to the sand extraction pipe 26 .

The water seepage channel 5 is arranged in the filter layer 4 , and a water-permeable concrete plate 11 is also arranged between the lower part of the filter layer 4 and the rainwater retention layer 6 .

A third infiltration layer 8 is provided under the permeable geotextile layer at the bottom of the first infiltration layer 22 and the rainwater retention layer 6 .

The first infiltration layer 22 is formed by mixing quartz sand and gravel in a ratio of 1:3. The first infiltration layer 22 is in the shape of a slope, and the horizontal angle is 15°.

The filter layer 4 is composed of hematite, activated carbon and quartz sand mixed in a ratio of 3:1:6.

The third percolation layer 8 is formed by mixing zero-valent iron, activated carbon and soil in a ratio of 1:2:7.

When it rains, the initial rainwater on the road passes through the grille on the water inlet 24 for initial purification to remove solid impurities and then flows into the primary rainwater treatment chamber 2 below the sidewalk 1, and the initial rainwater on the sidewalk seeps through the permeable bricks and gravels. The pebble layer 21 flows to the primary rainwater treatment room 2, and the length-width-height ratio of the primary rainwater treatment room 2 is 4:3:2. Precipitation infiltration occurs above layer 23 . The first infiltration layer 22 is composed of a mixture of quartz sand and gravel in a ratio of 1:3, and performs secondary filtration on the infiltrated initial rainwater to remove suspended particles and colloids in the initial rainwater, and the initial rainwater after the secondary filtration is filtered. Continue to infiltrate to the third percolation layer 8, wherein the third percolation layer 8 is composed of zero-valent iron, activated carbon and soil mixed in a ratio of 1:2:7, which is used to remove heavy metals and other pollutants in the initial rainwater to prevent Initial rainwater contaminates groundwater and underground soil layers.

As the precipitation continues, the water volume in the primary rainwater treatment chamber 2 increases, and the water level rises. When the water level is higher than the mud baffle 28, the rainwater will flow into the seepage channel 5, and the seepage channel 5 is inclined, so that the sediment deposited on the other side is accumulated, which is convenient for the sand pumping pipe 26 to extract the sediment and prevents water seepage. Channel 5 is blocked. The infiltrated rainwater is filtered and purified in the filter layer 4 together with the rainwater passing through the permeable asphalt road 3 . The filter layer 4 removes pollutants such as heavy metals, nitrogen and phosphorus in the initial rainwater. The filtered initial rainwater penetrates into the permeable geotextile layer and the permeable concrete slab 11 , wherein the permeable concrete slab 11 has a thickness of 5 cm and plays a load-bearing role. Rainwater seeps into the rainwater retention layer 6 for storing rainwater. The rainwater retention layer 6 is a double-layer raft, and the permeable geotextile layer and the third infiltration layer 8 under the rainwater retention layer 6 are placed horizontally to increase the retention time of rainwater and facilitate infiltration, and the horizontal placement is conducive to the stability of the overall structure . One side of the double-layer raft is a water pipe 9 , the rainwater that has not infiltrated increases with the increase of the water volume, and the water level rises, and the rainwater flows into the reservoir 7 through the water pipe 9 . Above the reservoir 7 is a water pipe 9 and a water pipe cover 10, which can be connected to a water pump to utilize the initial rainwater as a resource.

With the continuous influx of rainwater in the later stage, the water level rises sharply, and the rubber airbag 275 floats up due to the buoyancy of the water, which pushes the overturning of the waterproof plate 273, so that the entrance of the seepage channel 5 is sealed, and the rainwater in the later stage flows to the overflow pipe 25. , and discharged into the urban rainwater pipe through the overflow pipe 25. The rigid plastic mesh 276 fixed on the waterproof plate 273 has a diameter larger than that of the rubber air bag 275 and surrounds the rubber air bag 275.

Claims (7)

1. The utility model provides a park road oozes structure on layer down based on initial stage rainwater dams purification which characterized in that: the system comprises a primary rainwater treatment chamber (2) established below a sidewalk (1), and a filter layer (4), a water seepage channel (5) and a rainwater retention layer (6) established below an asphalt road (3);

the primary rainwater treatment chamber (2) comprises a top gravel layer (21) and a first infiltration layer (22) at the bottom, a permeable geotextile layer (23) is arranged above the first infiltration layer (22), a water inlet (24) is formed in the asphalt road (3) of the primary rainwater treatment chamber (2), a grid is arranged on the water inlet (24), an overflow pipe (25) leading to a city rainwater pipe and a sand pumping pipe (26) leading to the ground are also arranged in the primary rainwater treatment chamber (2), a buoyancy control switch (27) and a mud isolating baffle plate (28) are arranged in the primary rainwater treatment chamber (2), and the mud isolating baffle plate (28) leads rainwater in the primary rainwater treatment chamber (2) into the overflow pipe (25) or the water seepage channel (5) under the control of the buoyancy control switch (27);

a filtering layer (4), a water seepage channel (5) and a rainwater retention layer (6) are sequentially arranged below the asphalt road (3), and the rainwater retention layer (6) is connected with a reservoir (7);

the buoyancy control switch (27) comprises a supporting column (271), a special bearing (272), a waterproof plate (273), a waterproof lifting rope (274), a rubber air bag (275) and a hard plastic net (276), wherein the special bearing (272) is connected with the supporting column (271) and the waterproof plate (273), the rubber air bag (275) is hung on the waterproof plate (273) through the waterproof lifting rope (274), the sum of the length of the waterproof lifting rope (274) and the height of the rubber air bag (275) is smaller than the height of the supporting column (271), a mud baffle (28) is arranged on one side, close to the water inlet (24), of the waterproof plate (273), and the hard plastic net (276) surrounds the rubber air bag (275).

2. The structure of the park road lower seepage layer based on the closure purification of the initial rainwater according to the claim 1, characterized in that: infiltration passageway (5) be the water pipe that the cross section is the square, and the water pipe below does not have the pipe wall for the rainwater infiltrates under, the below of infiltration passageway (5) is for permeating water geotechnological cloth layer (23), infiltration passageway (5) are the slope form, the sand pumping pipe (26) are connected to the lower extreme of infiltration passageway (5).

3. The structure of the park road lower seepage layer based on the closure purification of the initial rainwater according to the claim 1, characterized in that: infiltration passageway (5) establish in filter layer (4), still be equipped with pervious concrete board (11) between the below of filter layer (4) and rainwater detention layer (6).

4. The structure of the park road lower seepage layer based on the closure purification of the initial rainwater according to the claim 1, characterized in that: and a third infiltration layer (8) is arranged below the permeable geotextile layer laid at the bottoms of the first infiltration layer (22) and the rainwater retention layer (6).

5. The structure of the park road lower seepage layer based on the closure purification of the initial rainwater according to the claim 1, characterized in that: the first percolation layer (22) is formed by mixing quartz sand and gravel pebbles according to the proportion of 1:3, the first percolation layer (22) is in a slope shape, and the horizontal included angle is 15 degrees.

6. The structure of the park road lower seepage layer based on the closure purification of the initial rainwater according to the claim 1, characterized in that: the filter layer (4) is formed by mixing hematite, activated carbon and quartz sand according to the ratio of 3:1: 6.

7. The structure of the park road lower seepage layer based on the closure purification of the initial rainwater according to the claim 4, wherein: the third percolation layer (8) is formed by mixing zero-valent iron, activated carbon and soil according to the ratio of 1:2: 7.

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