CN111305362A - A construction scheme of park road infiltration layer based on initial rainwater interception and purification - Google Patents

Abstract

The invention relates to a park road infiltration layer construction scheme based on initial rainwater interception and purification, and belongs to the technical field of sponge city construction. A primary rainwater treatment chamber is established below a sidewalk, and a filter layer, a water seepage channel and a rainwater retention layer are established below an asphalt road; the primary rainwater treatment chamber is provided with a water inlet on an asphalt road, an overflow pipe leading to an urban rainwater pipe and a sand pumping pipe leading to the ground are also arranged in the primary rainwater treatment chamber, a buoyancy control switch and a mud isolating baffle are arranged in the rainwater treatment chamber, and the mud isolating baffle controls the rainwater in the primary rainwater treatment chamber to be led into the overflow pipe or a water seepage channel under the control of the buoyancy control switch; the asphalt road below sets gradually filter layer, infiltration passageway and rainwater detention layer, and the rainwater detention layer is connected with the cistern. The invention has the beneficial effects that: when the rainfall is small, precipitation infiltration is carried out; when the rainfall is large, rainwater flows into the water seepage channel to perform infiltration treatment; and when the rainfall is overlarge, guiding later-stage rainwater to be drained into an urban drainage system.

Description

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

technical field

The invention relates to a construction scheme 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 above-mentioned deficiencies of the prior art, the present invention provides a construction technology for the infiltration layer of park roads 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 realized through the following technical solutions: a construction scheme for the infiltration layer of park roads based on the interception and purification of initial rainwater, which is characterized in that: it includes a primary rainwater treatment room established under the sidewalk and a filter layer and seepage water under the asphalt road. 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. 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. The rainwater treatment room is provided with a buoyancy control switch and a mud baffle, and the mud baffle is controlled by the buoyancy control switch to descend The rainwater in the primary stormwater treatment room is introduced into the overflow pipe or seepage channel;

A filter layer, a water seepage channel and a rainwater retention layer are arranged under the asphalt road in sequence, 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 filter layer is formed by mixing quartz sand and gravel in a ratio of 1:3, the first filter 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, nutrient salts, organic matter and suspended particles in the initial rainwater, so as to 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, a construction scheme for the infiltration layer of park roads based on initial rainwater interception and purification is characterized in that: it includes a primary rainwater treatment room 2 built 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 rainwater treatment room 2 is provided with a buoyancy control switch 27 and the mud baffle 28, the buoyancy control switch 28 controls the rainwater in the primary rainwater treatment chamber 2 to descend 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 filter layer 22 is formed by mixing quartz sand and gravel in a ratio of 1:3. The first filter 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 (8)

1. A construction scheme for the infiltration layer of park roads based on initial rainwater interception and purification, characterized in that it comprises a primary rainwater treatment room (2) established under the sidewalk (1) and a filter layer (2) established under the asphalt road (3). 4), 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, and a permeable geotextile layer (23) is arranged above the first percolation layer (22). The chamber (2) is provided with a water inlet (24) on the asphalt road (3), the water inlet (24) is provided with a grille, and the primary rainwater treatment chamber (2) is also provided with an overflow pipe (25) leading to the urban rainwater pipe. ) and the sand pumping pipe (26) leading to the ground, the rainwater treatment room (2) is provided with a buoyancy control switch (27) and a mud baffle (28), and the mud baffle (28) is connected to the buoyancy control switch (27). ) control the introduction of rainwater in the primary rainwater treatment room (2) 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). 2. A construction scheme for the infiltration layer of park roads based on initial rainwater interception and purification according to claim 1, characterized in that: the buoyancy control switch (27) comprises a support column (271), a special bearing (272) , waterproof plate (273), waterproof sling (274), rubber air bag (275) and hard plastic net (276), the special bearing (272) is connected to the support column (271) and the waterproof plate (273), waterproof The sling (274) hangs the rubber airbag (275) on the waterproof plate (273). The sum of the length of the waterproof sling (274) and the height of the rubber airbag (275) is less than the height of the support column (271). The plate (28) is arranged on the side of the waterproof plate (273) close to the water inlet (24), and the rigid plastic mesh (276) surrounds the rubber airbag (275). 3. The construction scheme for the infiltration layer of park roads based on initial rainwater interception and purification according to claim 1, characterized in that: the water seepage channel (5) is a water pipe with a square cross-section, and there is no pipe under the water pipe The wall is used for rainwater infiltration. Below the seepage channel (5) is a permeable geotextile layer (23), the seepage channel (5) is inclined, and the lowest end of the seepage channel (5) is connected to a sand extraction pipe (26). 4. The construction scheme of a park road infiltration layer based on initial rainwater interception and purification according to claim 1, characterized in that: the water infiltration channel (5) is arranged in the filter layer (4), and the filter layer (4) A permeable concrete slab (11) is also provided between the bottom of the ) and the rainwater retention layer (6). 5. A construction scheme for the infiltration layer of park roads based on initial rainwater interception and purification according to claim 1, characterized in that: the bottom of the first infiltration layer (22) and the rainwater retention layer (6) are laid A third infiltration layer (8) is arranged below the permeable geotextile layer. 6. The construction scheme of a park road infiltration layer based on initial rainwater interception and purification according to claim 1, characterized in that: the first filter layer (22) is composed of quartz sand and gravel at a ratio of 1:3 Proportional mixed composition, the first filter layer (22) is in the shape of a slope, and the horizontal angle is 15°. 7. a kind of park road infiltration layer construction scheme based on initial rainwater interception and purification according to claim 1, is characterized in that: described filter layer (4) is made of hematite, activated carbon and quartz sand by 3: 1:6 ratio of mixed composition. 8. The construction scheme of a park road infiltration layer based on initial rainwater interception and purification according to claim 1, characterized in that: the third infiltration layer (8) is composed of zero-valent iron, activated carbon and soil according to 1 :2:7 ratio mixed composition.

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