CN109989474B - Construction method of rainwater collection system - Google Patents

Construction method of rainwater collection system Download PDF

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Publication number
CN109989474B
CN109989474B CN201711476741.7A CN201711476741A CN109989474B CN 109989474 B CN109989474 B CN 109989474B CN 201711476741 A CN201711476741 A CN 201711476741A CN 109989474 B CN109989474 B CN 109989474B
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layer
concrete
pouring
foundation pit
construction
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CN109989474A (en
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冯玺
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Jiangsu Senyang Environmental Construction Group Co ltd
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Jiangsu Senyang Environmental Construction Group Co ltd
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    • EFIXED CONSTRUCTIONS
    • E03WATER SUPPLY; SEWERAGE
    • E03BINSTALLATIONS OR METHODS FOR OBTAINING, COLLECTING, OR DISTRIBUTING WATER
    • E03B11/00Arrangements or adaptations of tanks for water supply
    • E03B11/10Arrangements or adaptations of tanks for water supply for public or like main water supply
    • E03B11/14Arrangements or adaptations of tanks for water supply for public or like main water supply of underground tanks
    • EFIXED CONSTRUCTIONS
    • E03WATER SUPPLY; SEWERAGE
    • E03FSEWERS; CESSPOOLS
    • E03F5/00Sewerage structures
    • E03F5/10Collecting-tanks; Equalising-tanks for regulating the run-off; Laying-up basins

Abstract

The invention discloses a construction method of a rainwater collection system, which relates to a rainwater utilization technology and is used for solving the problem of water resource utilization; the method comprises the following steps: firstly, excavating a foundation pit on a construction site, paving a base layer in the foundation pit after the foundation pit is tamped, and backfilling the foundation pit to a designed elevation by using concrete; then, pouring the wall of the pool, constructing a waterproof layer of the foundation pit, and assembling a water storage module in the foundation pit after leveling; then laying a rainwater collecting system seepage layer, backfilling earthwork after laying is finished, and installing a water inlet pipeline and a water outlet pipeline to finish the construction step; the invention has the following advantages and effects: the rainwater collecting system constructed by the invention has the advantages of high structural strength, short construction period, convenience in installation, flexibility in combination, long service life and the like, has the functions of filtering and storing rainwater, can be used for garden irrigation, road cleaning and the like, reduces the use frequency of tap water resources, and achieves the purpose of improving the utilization rate of the water resources.

Description

Construction method of rainwater collection system
Technical Field
The invention relates to a rainwater utilization technology, in particular to a construction method of a rainwater collection system.
Background
The total amount of water resources in China is not small, but people can utilize water to rank the tail of the world, and the problem of water resource shortage and water environment deterioration is the primary constraint for realizing the sustainable development of population, environment, economy and society globally.
In recent years, rainwater resource utilization technology is gradually raised in China, and rainwater is mainly used for garden watering, toilet flushing and the like; common methods for treating rainwater are mainly classified into physical methods and biochemical methods; the physical method comprises coagulation, sedimentation and filtration, wherein the most common method is to build a filter tank and treat rainwater resources in a physical filtration mode; the biochemical method comprises an artificial wetland system, a stabilization pond, a biological filter, a biological rotating disc reactor, a biological contact oxidation, a biological fluidized bed reactor and a soil treatment method, and the biochemical treatment method can more thoroughly kill microorganisms in rainwater, but easily causes chemical pollutant residues and further pollutions to soil and water resources.
According to the application of rainwater resources, the use requirements can be met by adopting a physical filtering method, so the rainwater resources are treated by adopting a mode of building a rainwater collection system, but in the construction process of the existing rainwater collection system, the construction of the bottom of a collection pool is usually only in a form of directly pouring concrete, the construction of a pool wall and a base layer is usually separated, and as soil layers can sink along with the flow of ground water, the base layer and the pool wall at the bottom of a foundation pit are easy to break after long-time use, so that the structural strength of the foundation pit is improved, the service life of the rainwater collection system is prolonged, and the rainwater collection system becomes an important research subject for solving the problem of water resource utilization in a new period.
Disclosure of Invention
The invention aims to provide a construction method of a rainwater collection system, which adopts a layered and segmented reinforced concrete structure and can enhance the connection strength between a pool wall and a substrate layer so as to achieve the purpose of prolonging the service life of the rainwater collection system.
The technical purpose of the invention is realized by the following technical scheme: a construction method of a rainwater collection system comprises the following steps:
a. excavating a foundation pit: excavating a foundation pit with the depth of more than 5m at a construction position by adopting an excavator, paving a bearing layer at the bottom of the foundation pit after tamping, backfilling the foundation pit to a designed elevation by using concrete, excavating 50-60 cm on each layer by adopting a layered and segmented excavation mode on site, reserving 20cm for manual excavation when the foundation pit is excavated to the elevation of the foundation bottom, amplifying a foundation slope according to needs, and performing reinforcement treatment to prevent collapse;
b. constructing a base layer: after foundation pit excavation is finished and qualified through inspection, immediately binding bottom plate steel bars and vertical templates, pouring C25 concrete, and flattening a pouring layer to form a base layer;
c. construction of the pool wall: pouring the concrete into the pool wall with the height of 3.58m and the thickness of 800mm by adopting a single-side formwork supporting and layered pouring mode, wherein the pouring thickness of each layer of concrete is 300mm, and a worker or a woodworker checks whether the formwork and the support are loosened at any time in the pouring process and performs corresponding reinforcement;
d. construction of a water storage module: leveling the base layer by using fine sand, spraying clear water on the fine sand after leveling to keep the fine sand layer moist, then sequentially laying geotextile, impermeable membrane and impermeable composite geotextile on the fine sand layer, and arranging personnel to assemble the water storage module in the foundation pit on site after laying the waterproof layer;
e. and (3) construction of a water seepage layer: sequentially paving a foam board with the thickness of 200mm, broken stones with the thickness of 300mm, sand with the thickness of 300mm, charcoal with the thickness of 300mm and a planting soil layer with the thickness of 300mm on the water storage module to serve as a bottom die of a water seepage layer, wherein the bottom die is required to be uniformly flattened during paving;
f. backfilling earthwork: backfilling earthwork in layers, wherein the thickness of each layer is 500mm, each layer of earthwork needs to be tamped by a machine after backfilling, and a pipeline installation pit is reserved in the backfilling process;
g. and installing a rainwater pipeline.
By adopting the scheme, the foundation pit is excavated in layers in the step a, the excavation depth of the foundation pit can be conveniently controlled in the excavation process of the foundation pit, so that the foundation pit is not easy to overetch, the damage to a stress layer at the bottom of the foundation pit is reduced, and the soil stress layer is not easy to sink under the flushing of underground water; in the step b, the base layer formed by pouring the bottom plate steel bars, the vertical template and the concrete can be matched with the pool wall while the bearing capacity of the bearing layer is enhanced, the seepage-proofing capacity of the foundation pit is enhanced, and the base layer is laid immediately after the foundation pit is qualified, so that the exposure time of the base can be shortened, the possibility of disturbance of the base due to rain is reduced, and the structural strength of the foundation pit is improved; in the step c, concrete is poured in layers, so that each layer of concrete is kept stand and compacted after being poured, air chambers are not easy to appear in the concrete, the concrete is firmer after being solidified, the structural strength of the foundation pit is improved, the pool wall has better seepage-proofing capacity, and the steel frame structure of the support formwork is fixedly connected with the base layer in the process of building the unilateral support formwork, so that the pool wall can have higher connection strength with the base layer after being poured; in the step d, the fine sand layer is sprayed with clear water during laying, so that the fine sands are bonded together by means of the tension of water, the fine sands are not easy to flow due to wind blowing after the bottom of the foundation pit is leveled, the water storage module can uniformly apply pressure to the substrate layer after being installed, the substrate layer is not easy to sink unevenly due to unilateral force, and the pool wall and the substrate layer are not easy to break; the top plate in the step e can filter rainwater permeating the ground, and the filtered rainwater is stored in the water storage module; according to the rainwater collecting system constructed by the construction method, in the construction process, all stress layers are constructed in a layered and segmented manner, so that the stress layers can be checked and adjusted in time in the construction process, the pool wall and the substrate layer are fixedly connected through the unilateral formwork, the pool wall has higher connection strength with the substrate layer after being poured, and the connected part between the pool wall and the substrate layer is not easy to break when the soil stress layer sinks, so that the purpose of prolonging the service life of the rainwater collecting system is achieved; and the infiltration layer can supply subaerial rainwater infiltration to get into in the retaining module, consequently can adjust surface gathered water in rainy season, alleviates urban drainage pressure to reach the purpose that reduces flood disasters and take place the possibility.
The invention is further provided with: in the step a, the weathered fine sandstone is used as the holding layer, and the thickness of the holding layer is 300 mm.
Through adopting above-mentioned scheme, rainwater collection system buries underground to the fine sandstone of morals and manners is as the holding power layer, can keep foundation ditch bottom smooth as far as possible when laying, and can increase the area of contact of stratum basale and foundation ditch bottom when the stratum basale is laid, and then increase the lifting surface area of foundation ditch bottom, thereby make rainwater collection system be difficult to take place to subside in the use.
The invention is further provided with: in the step b, ground anchors are pre-buried in the base layer in the construction process.
Through adopting above-mentioned scheme, the earth anchor can be used for being connected with unilateral formwork at the in-process of pool wall construction, make the concrete be difficult to promote the wooden plywood motion at the in-process of pouring, and the construction of pool wall needs to go on before the concrete of stratum basale solidifies, because pour after the concrete solidifies again, the connection between pool wall and the stratum basale will become insecure, consequently, the earth anchor is burying underground, need weld the bottom plate reinforcing bar of earth anchor and stratum basale, increase the joint strength between unilateral formwork and the stratum basale, thereby make the junction between pool wall and the stratum basale be difficult to the emergence fracture.
The invention is further provided with: in the step c, the unilateral formwork structure adopts steel diagonal braces as supports, wood-rubber plates as formwork panels, square timbers as secondary keels and steel pipes as main keels, then concrete is poured between the soil wall and the wood-rubber plates, a water stop steel plate is arranged at the top of the formwork after the pouring is finished, and the water stop steel plate is in contact with the concrete.
By adopting the scheme, the wood-based panel is manufactured by processing the board pressing machine without cellulose fiber filler, has good corrosion resistance and waterproof capability, and the concrete contains a large amount of moisture before solidification, so the wood-based panel can have good concrete corrosion resistance, and the wood-based panel still needs to be disassembled after the concrete is completely solidified, at the moment, the steel pipe and the steel diagonal brace are wrapped in the concrete, the structural strength of the concrete can be enhanced, and the aim of improving the structural strength of the foundation pit is fulfilled.
The invention is further provided with: and the part of the steel pipe, which is in contact with the basal layer, is fixedly connected with the basal layer through an earth anchor.
Through adopting above-mentioned scheme, the steel pipe mainly used is connected unilateral formwork and earth anchor, make unilateral formwork and the bottom plate reinforcing bar of stratum basale fixed, and the concrete can have the trend of caving in at the in-process of pouring, the existence of this trend can make the concrete that is used for forming the stratum basale have the trend of overflow, consequently at concrete placement's in-process, need lay the wooden plywood on the stratum basale, and with the fixed wooden plywood of earth anchor, in order to avoid the concrete overflow, do so and can enough prevent the concrete overflow, can increase the density of concrete again, thereby further improve the structural strength of foundation ditch.
The invention is further provided with: in the step c, tamping equipment is needed to tamp each layer of concrete during pouring.
By adopting the scheme, the pouring of the pool wall is carried out in layers, and one-time tamping is carried out after each layer of concrete pouring, so that air mixed in the concrete pouring process can be removed from the concrete as much as possible, the structure of the concrete is firmer, air holes are not easy to appear after the concrete is solidified, and the pool wall has better seepage-proofing capability.
The invention is further provided with: and d, taking the geotextile as a substrate, immersing the asphalt into the geotextile, and coating the geotextile with rubber after the asphalt is cooled and solidified.
By adopting the scheme, the geotextile has stronger water seepage capability, in order to enable the water storage module to store rainwater, the geotextile needs to be subjected to seepage prevention treatment, the asphalt can increase the structural strength of the geotextile, the geotextile can bear the weight of the water storage module, and the rubber can separate the asphalt from the rainwater, so that chemical substances possibly contained in the asphalt are not easy to permeate into the rainwater, and the seepage-prevention composite geotextile has the effect of blocking pollution while playing a seepage-prevention effect.
The invention is further provided with: and d, paving geotextiles among the foam board, the gravel layer, the charcoal layer, the sand layer and the planting soil layer for separating the water seepage layer during paving.
Through adopting above-mentioned scheme, rubble layer, sand bed, planting soil layer and geotextile are used for supplying the earth's surface rainwater to ooze to filter the earth's surface rainwater that gets off permeating, geotextile is used for separating each infiltration layer when the infiltration layer is laid, is convenient for control the thickness of laying of infiltration layer, and thick foam can reduce the area that exposes of retaining module, the evaporation of separation rainwater, thereby reaches the purpose that the extension rainwater is preserved the continuation time.
The invention is further provided with: the geotextile is a polyester filter cloth.
By adopting the scheme, the polyester filter cloth has the advantages of acid and alkali resistance, wear resistance, corrosion resistance, no toxicity, no side effects and the like, and can have a good filtering effect in the rainwater filtering process.
In conclusion, the invention has the following beneficial effects: compared with a concrete water pool, the rainwater collecting system built by the construction method has the advantages of high structural strength, short construction period, convenience in installation, flexibility in combination, long service life and the like, and the built rainwater collecting system has the functions of filtering and storing rainwater, can be used for garden irrigation, road cleaning and the like, reduces the use frequency of tap water resources, and fully utilizes natural water resources endowed by nature, so that the purpose of improving the utilization rate of the water resources is achieved.
Drawings
FIG. 1 is a schematic view of the finished structure of the present invention;
fig. 2 is a partial enlarged view at a in fig. 1.
In the figure: 1. a foundation pit; 2. a support layer; 3. a base layer; 31. a bottom plate steel bar; 32. erecting a template; 4. a ground anchor; 5. supporting a formwork on a single side; 51. a steel diagonal brace; 52. wood veneer board; 53. square wood; 54. a steel pipe; 6. concrete; 7. a water stop steel plate; 8. geotextile; 9. an impermeable membrane; 10. anti-seepage composite geotextile; 11. a water storage module; 12. a foam board; 13. crushing stone; 14. charcoal; 15. sand; 16. planting soil; 17. a water inlet pipe; 18. a water outlet pipeline; 19. a geotextile.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
A construction method of a rainwater collection system, which is shown in fig. 1 and 2, and specifically includes the following steps:
a. excavating a foundation pit: excavating a foundation pit 1 at a construction position by adopting an excavator, wherein the design depth of the foundation pit 1 of the project is 5m, but the laying of a bearing layer 2 needs to be considered in the actual construction process, so the actual excavation depth is more than 5m, the specific excavation depth can be adjusted according to a construction site, a layered and segmented excavation mode is adopted on the site, each layer is excavated by 50-60 cm, 20cm is reserved for manual excavation when the foundation is excavated to the elevation of the foundation bottom, the foundation slope is amplified according to the requirement, and tamping and reinforcing treatment are carried out to prevent collapse; after the foundation pit 1 is excavated, the bottom of the pit needs to be tamped so as to improve the bearing capacity of soil; after tamping, laying a supporting layer 2 at the bottom of the foundation pit 1, wherein the supporting layer 2 is laid by adopting a weathered fine sandstone slab with the thickness of 300mm, and after finishing laying of the weathered fine sandstone, pouring concrete 6 with the strength grade of C25 on the weathered fine sandstone slab until the weathered fine sandstone slab reaches the designed elevation;
b. constructing a base layer: after the foundation pit 1 is dug and is checked to be qualified, immediately binding bottom plate reinforcing steel bars 31, wherein the bottom plate reinforcing steel bars 31 are reinforcing steel bars with threads on the surfaces, binding the bottom plate reinforcing steel bars 31 in a 'well' -shaped structure, placing steel vertical templates 32 in grids formed by the 'well' -shaped bottom plate reinforcing steel bars 31, welding ground anchors 4 at the crossed nodes of the bottom plate reinforcing steel bars 31, pouring C25 concrete 6 after the laying is finished, fixedly connecting the vertical templates 32 with the bottom plate reinforcing steel bars 31, paying attention to the fact that the pouring thickness of the concrete 6 cannot exceed the ground anchors 4 in the pouring process of the concrete 6, and flattening a pouring layer in the pouring process to form a base layer 3; the time is required to be grasped in time when the concrete 6 is poured and pounded so as to reduce the exposure time of the substrate layer 3 in the air and reduce the disturbance amplitude of the substrate layer 3 caused by rain soaking;
c. construction of the pool wall: the pool wall needs to be carried out before concrete of the base layer 3 is solidified, the concrete 6 is used as a main structure, the height of the pool wall is 3.58m, the wall thickness is 800mm, the water storage module 11 needs to be assembled when the foundation pit 1 is built, so that construction can be carried out only by adopting a single-side formwork 5, the single-side formwork 5 structure adopts steel inclined struts 51 as supports, wood rubber plates 52 as formwork panels, square timbers 53 as secondary keels and steel pipes 54 as main keels, and the square timbers 53 are mainly used for connecting two adjacent wood rubber plates 52; when the steel pipe 54 is used as a main keel, the steel pipe 54 is required to be fixedly connected with the ground anchor 4 so as to limit the displacement of the wood-plastic plate 52 and improve the connection strength of the pool wall and the base layer 3; concrete 6 is then poured between the soil wall and the wood veneer 52; before pouring, a wood-glue board 52 needs to be laid on the concrete of the base layer 3 and fixed by the ground anchor 4, because the concrete of the pool wall collapses during pouring, and the collapsed concrete can cause the concrete of the base layer 3 to overflow, so the wood-glue board 52 needs to be laid to prevent the concrete from overflowing, and the laying of the wood-glue board is limited to completely cover the base layer; the pool wall is layered during pouring, the pouring thickness of each layer of concrete 6 is 300mm, and a scaffold worker and a carpenter check whether the wood-rubber plate 52 and the support are loosened at any time during the pouring process and perform corresponding reinforcement; after the pouring is finished, installing a water stop steel plate 7 at the top of the pool wall, enabling the water stop steel plate 7 to be in contact with the concrete 6 so as to wrap the concrete 6, and removing the water stop steel plate 7 and the wood glue board 52 after the concrete 6 is solidified;
d. construction of a water storage module: after the concrete of the substrate layer 3 and the pool wall is completely solidified, leveling the substrate layer 3 by using fine sand 15, continuously spraying clear water to the fine sand 15 in the leveling process to keep the fine sand 15 layer moist, wherein the fine sand 15 can be mutually bonded by moisture, so that the fine sand 15 is not easy to collapse, then sequentially paving geotextile 8, impermeable membrane 9 and impermeable composite geotextile 10 on the leveled fine sand 15 layer, wherein the geotextile 8 is a water-permeable geosynthetic material formed by needling or weaving synthetic fibers; the impermeable membrane 9 is a polyethylene geomembrane and is mainly made of a thermoplastic resin material from milky semitransparent to opaque, namely polyethylene resin; the anti-seepage composite geotextile 10 takes the geotextile 8 as a substrate, then the asphalt is immersed in the geotextile 8, and after the asphalt is cooled and solidified, the geotextile 8 is coated with rubber so that the geotextile 8 has the anti-seepage function; after the waterproof layer is laid, arranging personnel to assemble the water storage module 11 in the foundation pit 1 on site, wherein the water storage module 11 used in the invention is made of PP (polypropylene) plastics, the rainwater storage module is a novel product which can be used for storing water and occupies small space, 95% of hollow space is arranged in a space structure of the rainwater storage module, high-efficiency water storage can be realized, and a hollow bearing column which is tapered in the rainwater storage module has super-strong bearing capacity, so that the rainwater collection system can be used as a lawn, a road surface or a parking lot and the like above the rainwater collection system after being built;
e. and (3) construction of a water seepage layer: after the water storage module 11 is assembled, a foam board 12 with the thickness of 200mm, broken stones 13 with the thickness of 300mm, charcoal 14 with the thickness of 300mm, sand 15 with the thickness of 300mm and planting soil 16 with the thickness of 300mm are sequentially paved on the water storage module 11 to serve as bottom moulds of water seepage layers, geotextile 19 is paved between the bottom moulds of the water seepage layers to serve as separation, and the bottom moulds of the water seepage layers are uniformly flattened during paving; the planting soil 16, the sand 15 and the broken stones 13 are mainly used for filtering rainwater, in fact, the impurities mainly contained in the rainwater are the sand 15, most of the sand 15 passes through the planting soil 16, the fine sand 15, the charcoal 14 and the broken stones 13 and then is intercepted, the clarity of the rainwater entering the water storage module 11 can meet the use requirement, and the charcoal 14 can intercept microorganisms possibly contained in the rainwater, so that the water quality of the rainwater entering the water storage module 11 is improved; the water seepage layer can enable accumulated water on the road surface to permeate into the water storage module, so that the probability of flood can be reduced in rainy season;
f. backfilling earthwork: backfilling earthwork in layers, wherein the thickness of each layer is 500mm, each layer of earthwork needs to be tamped by a machine after backfilling, and a pipeline installation pit is reserved in the backfilling process;
g. a rainwater pipeline is installed and divided into a water inlet pipeline 17 and a water outlet pipeline 18, the water inlet pipeline 17 is communicated with the rainwater collection and filtration tank, and the water outlet pipeline 18 is communicated with a delivery pump, so that rainwater in the water storage tank can be delivered to a parking lot, a lawn and the like; and after the rainwater pipeline is installed, earth is continuously filled back to bury the whole rainwater collection system, and then the water-permeable floor tiles are laid on the top of the rainwater collection system, so that accumulated water on the road surface can permeate into the water storage module.
The laid rainwater collection system structure is shown in fig. 1 and fig. 2, and comprises planting soil 16, sand 15, charcoal 14, broken stone 13, a foam plate 12, a water storage module 11, an anti-seepage composite geotextile 10, a geotextile 8, an anti-seepage film 9, a basal layer 3 and a bearing layer 2 from top to bottom in sequence, and concrete poured pool walls are arranged around the pool walls.
The construction method has the advantages of high structural strength, short construction period, convenience in installation, flexibility in combination, long service life and the like, the constructed rainwater collection system has the functions of filtering and storing rainwater, the collected rainwater can be used for garden irrigation, road cleaning and the like, the use frequency of tap water resources is reduced, natural water resources endowed by nature are fully utilized, and the utilization rate of the water resources is improved; the honeycomb-structure water storage module has an ultrahigh water storage space and an ultrahigh bearing structure, so that the top of the rainwater collection system can be used as a lawn, a road, a parking lot and the like after construction is finished, and the occupation of the rainwater collection system on urban space is reduced; and the structure of seepage formula can be used for the regulation rainwater when rainy season takes place, makes surface gathered water can the seepage to the retaining module in to have the function of alleviating urban drainage pressure.
The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present invention.

Claims (8)

1. A construction method of a rainwater collection system comprises the following steps:
a. excavating a foundation pit: excavating a foundation pit with the depth of more than 5m at a construction position by adopting an excavator, paving a bearing layer at the bottom of the foundation pit after tamping, backfilling the foundation pit to a designed elevation by using concrete, excavating 50-60 cm on each layer by adopting a layered and segmented excavation mode on site, reserving 20cm for manual excavation when the foundation pit is excavated to the elevation of the foundation bottom, amplifying a foundation slope according to needs, and performing reinforcement treatment to prevent collapse;
b. constructing a base layer: after foundation pit excavation is finished and qualified through inspection, immediately binding bottom plate steel bars and vertical templates, pouring C25 concrete, and flattening a pouring layer to form a base layer;
binding bottom plate reinforcing steel bars in a 'shaft' -shaped structure, placing a steel vertical template in a grid formed by the 'shaft' -shaped bottom plate reinforcing steel bars, welding ground anchors at the crossed nodes of the bottom plate reinforcing steel bars, pouring C25 concrete after the laying is finished, fixedly connecting the vertical template and the bottom plate reinforcing steel bars, paying attention to the fact that the pouring thickness of the concrete cannot exceed the ground anchors in the concrete pouring process, and tamping a pouring layer in the pouring process to form a base layer;
c. construction of the pool wall: pouring the concrete into the pool wall with the height of 3.58m and the thickness of 800mm by adopting a single-side formwork supporting and layered pouring mode, wherein the pouring thickness of each layer of concrete is 300mm, and a worker or a woodworker checks whether the formwork and the support are loosened at any time in the pouring process and performs corresponding reinforcement;
d. construction of a water storage module: leveling the base layer by using fine sand, spraying clear water on the fine sand after leveling to keep the fine sand layer moist, then sequentially laying geotextile, impermeable membrane and impermeable composite geotextile on the fine sand layer, and arranging personnel to assemble the water storage module in the foundation pit on site after laying the waterproof layer;
the impermeable composite geotextile takes geotextile as a substrate, then the asphalt is immersed in the geotextile, and after the asphalt is cooled and solidified, the geotextile is coated with rubber;
e. and (3) construction of a water seepage layer: a foam board with the thickness of 200mm, broken stones with the thickness of 300mm, charcoal with the thickness of 300mm, and a water storage module are sequentially paved,
Sand with the thickness of 300mm and a planting soil layer with the thickness of 300mm are used as bottom moulds of the water seepage layer, and the bottom moulds are uniformly spread when being paved;
f. backfilling earthwork: backfilling earthwork in layers, wherein the thickness of each layer is 500mm, each layer of earthwork needs to be tamped by a machine after backfilling, and a pipeline installation pit is reserved in the backfilling process;
g. and installing a rainwater pipeline.
2. A method of constructing a rainwater collection system according to claim 1 wherein: in the step a, the weathered fine sandstone is used as the holding layer, and the thickness of the holding layer is 300 mm.
3. A method of constructing a rainwater collection system according to claim 1 wherein: in the step b, ground anchors are pre-buried in the base layer in the construction process.
4. A method of constructing a rainwater collection system according to claim 1 wherein: in the step c, the unilateral formwork structure adopts steel diagonal braces as supports, wood-rubber plates as formwork panels, square timbers as secondary keels and steel pipes as main keels, then concrete is poured between the soil wall and the wood-rubber plates, a water stop steel plate is arranged at the top of the formwork after the pouring is finished, and the water stop steel plate is in contact with the concrete.
5. A method of constructing a rainwater collection system according to claim 4 and further characterised by: and the part of the steel pipe, which is in contact with the basal layer, is fixedly connected with the basal layer through an earth anchor.
6. A method of constructing a rainwater collection system according to claim 1 wherein: in the step c, tamping equipment is needed to tamp each layer of concrete during pouring.
7. A method of constructing a rainwater collection system according to claim 1 wherein: and d, paving geotextiles among the foam board, the gravel layer, the charcoal layer, the sand layer and the planting soil layer as partitions when the bottom die of the top plate is paved.
8. A method of constructing a rainwater collection system according to claim 7 wherein: the geotextile is a polyester filter cloth.
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