CN106245578B - A kind of retaining wall and its construction method for building sponge city - Google Patents

Abstract

The invention relates to a retaining wall for constructing a sponge city and a construction method thereof. The retaining wall is a wall with a concrete structure, a solar power system is arranged on the top of the retaining wall, flower troughs are arranged on the outside of the retaining wall, and the wall A water delivery pipe, a water collection pipe and a water suction pipe are arranged inside, a water storage tank is arranged under the wall body, a water pump is arranged in the water storage tank, the water pump is connected with the water suction pipe, and the water storage tank is connected with the urban drainage system at the same time. The invention makes full use of solar energy, which is a huge amount of energy, has ingenious design and convenient construction, and is used for building an intelligent sponge city.

Description

A kind of retaining wall and its construction method for constructing sponge city

technical field

The invention belongs to the technical field of urban drainage and waterlogging prevention and greening landscape, and in particular relates to a retaining wall for constructing a sponge city and a construction method thereof.

Background technique

There are many retaining structures in today's cities, the most important ones are retaining walls, which are mostly concrete components and have a cold and hard appearance. After water is discharged from the drain hole on the concrete wall, it is easy to efflorescence along the wall surface, which affects the durability of the structure and affects the appearance; the scattered flow of the concrete drain hole is easy to cause erosion of the backfill soil in front of the retaining wall, which will cause damage over time. Part of the backfill soil in front of the wall is lost, the foundation at the toe of the wall is softened, and the bearing capacity is reduced.

Sponge city is a new generation of urban stormwater management concept. It refers to the city's good "elasticity" in adapting to environmental changes and responding to natural disasters caused by rainwater. It can also be called "water elastic city". The international general term is "low-impact development stormwater system construction". When it rains, it absorbs, stores, infiltrates, and purifies water, and "releases" the stored water for use when needed.

With the expansion of the city and the rapid development of urbanization, there is an urgent need for a retaining wall that conforms to the concept of a sponge city, which can beautify the city, conform to the concept of green buildings, and store some rainwater, reduce the peak value of rainwater, and reduce urban drainage during the rainy season At the same time, the use of rainwater can also save urban water, reduce urban irrigation facilities, and avoid waste of rainwater.

Contents of the invention

Based on the above background, the object of the present invention is to provide a retaining wall for constructing a sponge city and a construction method thereof, the structure is ingenious in design and convenient in construction.

Technical scheme of the present invention is as follows:

A retaining wall for constructing a sponge city, the retaining wall is a concrete structure wall, a planter is arranged on the outside of the retaining wall, a soil layer and a water filtration layer are arranged in the flower groove, and the soil layer is arranged on the water filtration layer, Plants can be planted in the soil layer, a layer of permeable geotextile is arranged between the soil layer and the water filter layer, and the wall in the planter is provided with the outlet of the water delivery pipe and the inlet of the water collection pipe;

The retaining wall can be provided with planters; the planter is a reinforced concrete structure, and its wall thickness is determined by the resistance of the reinforced concrete structure with the same strength level as the concrete of the retaining wall under the action of the total gravity of the plants, soil layer, filter layer and water , the flower trough extends into the retaining wall through horizontal steel bars to form an integral body with the retaining wall;

The filter layer is paved with gravel;

The inner side of the retaining wall is provided with a water-resistant layer and a water-permeable layer. The water pipe runs through the wall. The inlet is set behind the water-permeable layer and higher than the outlet. The outlet of the water pipe is higher than or equal to the height of the soil layer. The edge of the flower tank prevents the loss of the soil layer when the rainwater overflows; the inlet of the water collection pipe in the flower tank is higher than the bottom of the flower tank and lower than the top of the filter layer;

The water collecting pipe is set in the wall to collect the rainwater filtered by the planters. The outlet of the water collecting pipe is set in the reservoir. There are multiple rows of running water plates on the upper part of the water storing tank. The running water plates are arranged alternately to increase the path length of the rainwater. , allowing rainwater to be purified by further settling;

Barriers can be set on the running water plate to increase the path for rainwater to flow through, and at the same time prevent the settled silt from falling into the reservoir;

A water pump is arranged in the reservoir, and the water pump is connected with the water pump, and the water pipe is arranged in the wall, and the top of the water pipe is higher than the top of the wall, and a nozzle is installed, so that the water in the reservoir can be pumped to the bottom of the retaining wall. The top, and spray the plants in the flower tank through the nozzle to solve the survival problem of the plants when the flower tank lacks water;

The cistern is connected to the urban drainage system, and the cistern is provided with a water level control device. The water level control device includes a solenoid valve, a water level sensor and a controller set on the pipeline connected to the urban drainage system, and the water level sensor is used to detect water storage. The height of the water level in the pool, the controller controls the switch of the solenoid valve according to the water level in the pool, and when there is too much water in the pool, the excess water can be drained through the urban drainage system;

The top of the retaining wall is equipped with a solar power system, which provides power for water pumps and water level control devices; the solar power system includes solar thin film packaging, inverters and energy storage devices. The styrene polymer is used as a substrate, on which a cadmium telluride solar film or a copper indium gallium selenide solar film is deposited, and the total thickness of the solar thin film package is 110-120 μm; preferably 105 μm.

Backfilling is provided on the outer side of the retaining wall.

The bars on the running water plate can be replaced with grooves, or the grooves of the bars are arranged in a staggered manner.

The running water plate may be in the form of spiral descent.

A construction method for constructing a retaining wall of a sponge city, the method comprising the following steps:

Step 1: Excavate the reservoir at the position where the retaining wall needs to be built, install a water pump in the reservoir, open the entrance of the suction pipe on the wall of the reservoir, lay the pipeline connected with the urban drainage system, A running water plate with retaining strips is installed on the side wall of the pool;

Step 2: Build the main body of the retaining wall on the reservoir, and set the water collection pipe, water delivery pipe and water pumping pipe in the main body of the retaining wall. One or more rows of planters, the planter is a reinforced concrete structure, and its wall thickness is determined according to the resistance of the reinforced concrete structure with the same strength level as the concrete of the retaining wall under the action of the total gravity of the plants, soil layer, filter layer and water , the flower trough extends into the retaining wall through horizontal steel bars to form an integral body with the retaining wall, the outlet of the water delivery pipe and the inlet of the water collection pipe are set in the flower trough, the outlet of the water delivery pipe is higher than the inlet of the water collection pipe, and the inlet of the water collection pipe is higher at the bottom of the planter;

Step 3: Set the water-resistant layer, water-permeable layer, and water-resistant layer on the inner side of the retaining wall in sequence from top to bottom. The water delivery pipe is set behind the water-permeable layer. The bottom is lower than the lowest water pipe inlet;

Step 4: Backfill before adding walls on the outside of the retaining wall;

Step 5: Lay a filter layer in the planter, the top of the filter layer is higher than the water collection pipe, and then lay a layer of permeable geotextile, and lay a soil layer on the permeable geotextile, the soil layer is lower than the water pipe or equal to the water pipe , planting plants in the soil layer;

Step 6: Set the nozzle on the top of the water pipe;

Step 7: Set the water level control device, set the solenoid valve on the pipeline connected with the urban drainage system, set the water level sensor and controller in the reservoir;

Step 8: Set up the solar power system on top of the retaining wall and electrically connect to the water pump and water level control.

The invention has the beneficial effects of beautifying the concrete wall through the installation of plants, avoiding the rigidity of the concrete, realizing the concept of green building, and simultaneously storing part of the rainwater, reducing the peak value of rain and flood, and saving water for urban irrigation. The retaining wall of the present invention is convenient in construction and ingenious in design, which can not only green and beautify the city, but also enhance the durability and reliability of the concrete retaining wall; make full use of solar energy, a huge amount of energy, as a power source, and can store water to realize a smart city , Sponge city construction concept.

Description of drawings

Fig. 1 is a sectional view of a retaining wall of the present invention.

Explanation of reference signs

1 sprinkler head 2 planter

3 soil layer 4 filter layer

5 Ground 6 Backfilling before walls

7 Bar 8 Running board

9 Reservoir 10 Water pump

11 Suction pipe 12 Water barrier

13 Aquitard 14 Urban Drainage System

15 Water delivery pipe 16 Water collection pipe

17 Solenoid Valve 18 Solar Power System

Detailed ways

In order to make the above and other objects, features and advantages of the present invention more comprehensible, preferred embodiments of the present invention will be described in detail below together with the accompanying drawings.

The present invention provides a kind of retaining wall that constructs sponge city, and its section is shown in Figure 1, and retaining wall is the wall body of concrete structure, and the outer side of retaining wall is provided with greening structure, and this greening structure is preferably planter 2, The planter 2 is provided with a soil layer 3 and a water filter layer 4, the soil layer 3 is arranged on the water filter layer 4, plants can be planted in the soil layer 3, and a layer of permeable geotechnical structure is arranged between the soil layer 3 and the water filter layer 4. Cloth, the body of wall in the planter 2 has the outlet of the water delivery pipe 15 and the inlet of the water collecting pipe 16.

The retaining wall may include one or more rows of planters 2, so that when rainwater overflows the top of the retaining wall, rainwater can be collected.

Planter 2 is a reinforced concrete structure, and its wall thickness is determined by the total gravity of plants, soil layer, filter layer and water, according to the resistance of the reinforced concrete structure with the same strength level as the concrete of the retaining wall. The inside of the earth wall is integrated with the retaining wall.

The water filter layer 4 is paved with gravel, pebbles or other permeable fillers.

The inner side of the retaining wall is provided with a water-resisting layer 12 and a water-permeable layer 13, and the inlet of the water delivery pipe 15 is arranged in the water-filtering layer 4.

Water delivery pipe 15 runs through body of wall, and its entrance is higher than outlet, and the outlet of water delivery pipe 15 is higher than or equal with soil layer 3 height, and soil layer 3 height is lower than planter 2 edge, and the loss of soil layer when preventing rainwater from overflowing. The entrance of water collecting pipe 16 in flower tank 2 is higher than flower tank 2 bottom, is lower than the top of filter layer 4, guarantees to reserve part rainwater for plant growth, and excess rainwater flows into reservoir 9 through water collecting pipe 16.

The plants in the planter 2 should be plants that can survive under both drought and wet conditions, such as hanging plants.

The water collecting pipe 16 is arranged in the body of wall to collect the rainwater filtered by the planter 2 , and the outlet of the water collecting pipe 16 is arranged in the reservoir 9 . The upper part of the reservoir 9 is provided with a plurality of rows of flow boards 8, and the flow boards 8 are interlaced with each other to increase the path length of the rainwater, so that the rainwater can be purified through further settlement.

Barriers 7 can be set on the running water plate 8 to increase the path for rainwater to flow through and prevent the settled silt from falling into the reservoir 9 .

In other embodiments, the retaining bars 7 on the running water plate 8 may also be replaced with grooves, or the grooves and the retaining bars are alternately arranged. The running water plate 8 can be in a spiral descending form.

A water pump 10 is arranged in the reservoir 9, and the water pump 10 is connected with a water pump 11, and the water pump 11 is arranged in the wall, and the top of the water pump 11 is higher than the top of the wall, and a nozzle 1 is installed, so that the water pump 11 can be installed in the water reservoir 9. The water is pumped to the top of the retaining wall, and sprayed to the plants in the planters through the nozzle 1, so as to solve the survival problem of the plants when the planters are short of water.

The reservoir 9 is connected with the urban drainage system 14, and the reservoir 9 is provided with a water level control device. The water level control device includes a solenoid valve 17, a water level sensor and a controller arranged on a pipeline connected to the urban drainage system. The sensor detects the water level height in the reservoir 9, and the controller controls the switch of the electromagnetic valve 17 according to the water level height in the reservoir 9, and when the water in the reservoir 9 is too much, excess water can be drained away by the urban drainage system.

A solar power system 18 is arranged on the top of the retaining wall, and the water pump 10 and the water level control device are powered by the solar power system 18 . The solar power system 18 includes a solar thin film package, an inverter, and an energy storage device. The solar thin film package uses a polymer substrate of polypropylene and polystyrene as a substrate, on which a cadmium telluride solar film or copper indium gallium is deposited. Selenium solar film, the solar thin film package has a total thickness of 105 μm, which can also be extended to 110-120 μm in other implementations.

In other embodiments, the solar thin film packaging can also use 85 μm thick stainless steel as a substrate, on which a cadmium telluride solar film, copper indium gallium selenide solar film or a fullerene film is pasted.

Front backfill 6 is arranged on the outer side of the retaining wall.

The invention also discloses a construction method for constructing the retaining wall of the sponge city, the method comprising the following steps:

Step 1) Excavate the reservoir 9 at the position where the retaining wall needs to be built. It is located below the ground and has a minimum volume of 17.33 times the average daily precipitation in the city during the flood season. One-way infiltration can be attached to the reservoir 9 Film, need dry 10-12 hour after sticking film, set water pump 10 apart from the bottom 10 centimeters in reservoir 9, offer the entrance of suction pipe 11 on the wall of reservoir 9, lay the pipeline that links to each other with urban drainage system 14 , install running water plate 8 on the side wall of reservoir 9; Running water plate 8 can be arranged at intervals of 30 centimeters up and down;

Step 2) Build the retaining wall body on the reservoir 9, set the water collecting pipe 16, the water delivery pipe 15 and the water suction pipe 11 in the retaining wall body, the water suction pipe 11 can be vertically arranged, and its water outlet is higher than the retaining wall body. The top of the earth wall is 20 cm, and one or more rows of planters 2 are arranged outside the retaining wall body. The planter 2 is a reinforced concrete structure, and its wall thickness is under the total gravity of plants, soil layers, water filtration layers and water. Determined by the resistance of reinforced concrete structures with the same strength grade as the retaining wall concrete, the planter 2 extends into the retaining wall through horizontal steel bars to form an integral body with the retaining wall, and the water delivery pipe 15 can be arranged in multiples horizontally, and the water inlet of the water delivery pipe The end is 15° higher than the water outlet, and the water collecting pipe 16 can be vertically arranged, and the outlet of the water delivery pipe 15 and the inlet of the water collecting pipe 16 are all arranged in the flower tank 2;

Step 3) Set the water-resistant layer 12, the water-permeable layer 13, and the water-resistant layer 12 in sequence from top to bottom inside the retaining wall, and the length ratio thereof is 1:4:5. The top of the layer 13 is 15 centimeters higher than the uppermost water delivery pipe 15 inlet, and the bottom of the permeable layer 13 is 15 centimeters lower than the lowermost water delivery pipe 15 inlet;

Step 4) Backfill 6 before adding the wall on the outside of the retaining wall. After the earthwork construction is completed, it can be compacted with the vibration of 55cm ³ /s water flow;

Step 5) Lay the filter layer 4 in the planter 2, the top of the filter layer 4 is higher than the water collection pipe 16, and then lay a layer of 0.15cm thick permeable geotextile, the requirement of the permeable geotextile is that the bursting strength of CBR is 3KN, The elongation at break is 39%, the breaking strength is 17KN/m, the tearing strength is 0.48KN, and the vertical permeability coefficient is between 0.01-0.09mm/s. The soil layer 3 is laid on the permeable geotextile, and the soil layer 3 is lower than Water delivery pipe 15 or flat with water delivery pipe 15, plants are planted in soil layer 3;

Step 6) sprinkler head 1 is set on the top of suction pipe 11;

Step 7) set the water level control device, set the solenoid valve 17 on the pipeline connected to the urban drainage system 14, set the water level sensor and the controller in the reservoir 9;

Step 8) Install a solar power system 18 on the top of the retaining wall, and electrically connect with the water pump 10 and the water level control device.

The above is only a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Anyone skilled in the art can easily think of changes or substitutions within the technical scope disclosed in the present invention. Should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims (5)

1. a kind of retaining wall for building sponge city, which is characterized in that retaining wall is concrete structure wall, the outside of retaining wall Flower trough is set, is provided with soil layer and drainage layer in flower trough, soil layer is arranged on drainage layer, planting plants in soil layer, soil layer and One layer of permeable geotextiles are equipped between drainage layer, the wall in flower trough is provided with the outlet of water-supply-pipe and the entrance of collector pipe；

Retaining wall sets flower trough, and flower trough is reinforced concrete structure, and wall thickness is in the gross weight of plant, soil layer, drainage layer and water Under power effect, determine that flower trough passes through horizontal steel by the Resistance of Reinforced Concrete Structures power with retaining wall concrete same intensity grade Muscle stretches into retaining wall and forms one with retaining wall；

Drainage layer is equipped with sand gravel；

Water barrier and pervious bed are provided on the inside of retaining wall, water-supply-pipe runs through wall, and entrance is arranged on after pervious bed and high In outlet, the outlet of water-supply-pipe is higher than or maintains an equal level with soil layer height, and soil layer height is less than flower trough edge, prevents native when rainwater from overflowing The loss of layer；The entrance of collector pipe is higher than flower trough bottom in flower trough, less than the top of drainage layer；

Collector pipe is arranged in wall, collects the rainwater after flower trough filtering, collector pipe outlet is arranged in cistern, on cistern Portion is provided with multiple rows of drain board, drain board setting interlaced with each other, increases the path length that rainwater flows through so that rainwater is by into one Step sedimentation is purified；

Blend stop on the drain board is set to increase the path that rainwater flows through, while prevents the mud of sedimentation from falling into cistern；

Water pump is provided in cistern, water pump is connected with drinking-water pipe, and drinking-water pipe is arranged in wall, and wall is higher than at the top of drinking-water pipe Top, and nozzle is installed, the water in cistern is extracted into earth-retaining coping, and passes through the plant that nozzle is injected in flower trough Object, the vital conjuncture of plant during solving flower trough water shortage；

Cistern is connected with sewerage system, and cistern is provided with water-level control apparatus, water-level control apparatus be included in Solenoid valve, water level sensor and the controller set on the pipeline that sewerage system is connected, is detected by water level sensor Height of water level in cistern, the switch of height of water level control solenoid valve of the controller in cistern, when in cistern Drain extra water during dilutional hyponatremia by sewerage system；

Solar power system is provided at the top of retaining wall, is provided by solar power system for water pump and water-level control apparatus Power；The solar power system includes solar energy film encapsulation, inverter and energy storage device, and solar energy film encapsulation is with poly- The polymer of acrylic and polyphenyl alkene makees substrate, deposits cadmium telluride solar energy membrane or copper indium gallium selenium solar film, solar energy thereon Thin-film package overall thickness is 110-120 μm；

It is backfilled before wall is provided on the outside of retaining wall.

2. a kind of retaining wall for building sponge city according to claim 1, which is characterized in that the blend stop on drain board replaces It is changed to groove or blend stop and groove is staggered.

3. a kind of retaining wall for building sponge city according to claim 1, which is characterized in that drain board is that spiral declines Structure.

4. a kind of retaining wall for building sponge city according to claim 1, which is characterized in that solar energy film encapsulation is total Thickness is 105 μm.

A kind of 5. construction method for the retaining wall for building sponge city as described in claim 1, which is characterized in that this method bag Include following steps：

S1) position for building retaining wall is being needed first to excavate cistern, unidirectional osmosis film is attached in cistern, drying is needed after pad pasting When 10-12 is small, water pump in cistern at 10 centimeters away from bottom is set, the entrance of drinking-water pipe, paving are opened up on the wall of cistern If the pipeline being connected with sewerage system, drain board of the installation with blend stop on the side wall of cistern；

S2 retaining wall body) is built out on cistern, collector pipe, water-supply-pipe and drinking-water pipe are arranged in retaining wall body, is taken out The water outlet of water pipe sets flower trough higher than at the top of retaining wall, in retaining wall outer body, and flower trough is reinforced concrete structure, wall Thickness is mixed under the total force effect of plant, soil layer, drainage layer and water by the reinforcing bar with retaining wall concrete same intensity grade Xtah Crude Clay structure drag determines that flower trough is stretched by horizontal reinforcement forms one with retaining wall in retaining wall, the outlet of water-supply-pipe and The entrance of collector pipe is arranged in flower trough, and the outlet of water-supply-pipe is higher than the entrance of collector pipe, and the entrance of collector pipe is higher than flower trough bottom Portion；

S3 water barrier, pervious bed, water barrier) are set gradually from top to bottom in the inside of retaining wall, length ratio is 1:4:5, it is defeated After water pipe is arranged on pervious bed, the top of pervious bed is higher than uppermost water delivery tube inlet, and the bottom of pervious bed is less than bottom Water delivery tube inlet；

S4 backfilled before) increasing wall in the outside of retaining wall；

S5 drainage layer) is laid in flower trough, the top of drainage layer re-lays the thick permeable geotechniques of one layer of 0.15cm higher than collector pipe Cloth, the requirements of permeable geotextiles are CBR bursting strengths for 3KN, and elongation at break 39%, ultimate strength 17KN/m is torn Strength is 0.48KN, and vertical permeability coefficient is between 0.01-0.09mm/s, soil layer is laid in permeable geotextiles, soil layer is low Maintain an equal level in water-supply-pipe or with water-supply-pipe, the planting plants in soil layer；

S6 nozzle) is set at the top of drinking-water pipe；

S7) water-level control apparatus is set, solenoid valve is set on the pipeline being connected with sewerage system, is set in cistern Water level sensor and controller；

S8 solar power system) is set in earth-retaining coping, and is electrically connected with water pump and water-level control apparatus.