CN112900603A

CN112900603A - Silica sand water storage and purification pool and construction process thereof

Info

Publication number: CN112900603A
Application number: CN202110054825.1A
Authority: CN
Inventors: 贾君; 褚峰; 张侃; 刘霞; 张雷; 杨林; 石菊; 沈晓明
Original assignee: Beijing Golden River Water Conservancy Construction Group Co ltd
Current assignee: Beijing Golden River Water Conservancy Construction Group Co ltd
Priority date: 2021-01-15
Filing date: 2021-01-15
Publication date: 2021-06-04

Abstract

The application relates to a silica sand water storage and purification tank and a construction process thereof, belonging to the technical field of water storage tanks, and comprising a tank body and a central control system for regulating and controlling rainwater in the tank body, wherein the interior of the tank body is sequentially divided into a high-efficiency filtering tank, a purification tank and a regulation and storage tank by utilizing an inner wall, and the high-efficiency filtering tank, the purification tank and the regulation and storage tank are communicated; the high-efficiency filter tank is provided with a water inlet pipe, and a multi-stage filter grid and a first sewage discharge pump are arranged in the high-efficiency filter tank; a plurality of silica sand water inlet well chambers and a plurality of silica sand water outlet well chambers which are alternately arranged and tightly attached for filtering rainwater are arranged in the water purifying tank; an adsorption tank filled with an adsorption material for adsorbing inorganic heavy metal ions in rainwater is arranged in the regulation and storage tank, and a water outlet pipe is arranged on an outer wall of the regulation and storage tank opposite to the inner wall. This application is through with the rainwater in high efficiency filter tank and clean water reservoir through the multistage filtration, gets rid of the particle impurity in the rainwater to utilize the adsorption material in the regulation pond to adsorb the soluble inorganic heavy metal ion in the rainwater, thereby improved the water purification effect.

Description

Silica sand water storage and purification pool and construction process thereof

Technical Field

The application relates to the field of water reservoirs, in particular to a silica sand water storage water purification reservoir and a construction process thereof.

Background

In recent years, in the process of urban construction, because a drainage system is unreasonably and unsound in design, waterlogging easily occurs. In the season of heavy rainfall, the rainfall intensity is high, the rainfall is concentrated, the rainfall amount exceeds the urban drainage capacity easily to form accumulated water on the road surface, even the water flows backwards, and the important influence is caused on social production and urban operation. In order to deal with the situation, sponge city construction is advocated and promoted in various places at present, controllable management of urban rainfall flood is realized, water is absorbed and stored in rainy days, and stored water is released and utilized as required, so that urban waterlogging and local flood disasters can be avoided, rainwater resources can be fully utilized, and the concept of green, low carbon and sustainable development in city construction is fully embodied.

In a rainwater regulation and control system of a sponge city, a storage regulation pool is an important component. The regulation pond can keep in the peak flow of rainwater runoff in, treat after the maximum flow descends and discharge rainwater slowly from the regulation pond again, can avoid the rainwater flood peak, realize rainwater cyclic utilization, can avoid the initial stage rainwater again to bearing the pollution of water, can also play the positive role to the drainage scheduling between the drainage region. Because the rainwater that collects in the regulation pond contains more impurity and pollutant, can utilize after can making the rainwater of storage discharge, need carry out purification treatment to the rainwater.

The prior Chinese utility model with the publication number of CN207499132U discloses a novel rainwater storage and purification treatment underground regulating reservoir, which comprises a water storage frame, the water storage frame is arranged on the underground layer, a reservoir is arranged in the middle of the water storage frame, a sand filter tank is arranged on one side of the reservoir, a regulating reservoir is arranged on the other side of the reservoir, a bell mouth arranged on the upper part of the sand filter tank is connected with an overflow pipe, rainwater in the sand filter tank enters a sand filter layer through a dirt blocking grid for filtering out large particle impurities, the sand filter layer comprises a medium coarse sand layer and a pebble layer, a permeable geomembrane is laid between the medium coarse sand layer and the pebble layer, a perforated pipe for discharging filtered rainwater to the reservoir when the water amount is small is arranged at the bottom of the sand filter layer, an overflow weir for discharging filtered rainwater to the reservoir when the water amount is large is arranged on the upper part of the sand filter layer, and a submersible pump arranged in the reservoir is, the surface of the water outlet pipe is provided with an ultraviolet disinfection and sterilization device.

In view of the above-mentioned related technologies, the inventors consider that there are defects of poor water purification effect: the sand filtration layer can play particulate matter impurity and deposit and filterable function, but when the water yield is great, the rainwater directly crosses the overflow weir easily and directly gets into the cistern, and purifying effect is relatively poor to inorganic pollutants such as heavy metal to dissolve in the rainwater can not effectual the getting rid of.

Disclosure of Invention

In order to improve the water purification effect of a regulation and storage tank, the application provides a silica sand water storage water purification tank and a construction process thereof.

The application provides a silica sand retaining clean water reservoir adopts following technical scheme:

a silica sand water storage and purification tank comprises a tank body and a central control system for regulating and controlling rainwater in the tank body, wherein the tank body comprises a bottom plate, an outer wall and a top plate which enclose a water storage and purification space, the interior of the tank body is sequentially divided into a high-efficiency filtering tank, a purification tank and a regulation and storage tank by utilizing an inner wall, and the high-efficiency filtering tank, the purification tank and the regulation and storage tank are communicated; a water inlet pipe is arranged on an outer wall opposite to the inner wall at the high-efficiency filter tank, and a multi-stage filter grid and a first sewage draining pump are arranged between the opposite outer wall and the inner wall; a plurality of silica sand water inlet well chambers and a plurality of silica sand water outlet well chambers which are alternately arranged and tightly attached for filtering rainwater are arranged in the water purifying tank; an adsorption groove filled with an adsorption material for adsorbing inorganic heavy metal ions of rainwater is arranged in the regulation and storage tank, a water outlet pipe is arranged on an outer wall of the regulation and storage tank opposite to the inner wall, and the rainwater is treated by the adsorption material in the adsorption groove and then is discharged by the water outlet pipe; water level sensors are arranged in the high-efficiency filtering tank, the water purifying tank and the storage regulating tank and are electrically connected with the central control system; the filter grid is higher than the overflow water level line.

By adopting the technical scheme, rainwater firstly enters the high-efficiency filter tank through the water inlet pipe, most of particulate matters in the rainwater are intercepted and precipitated on the bottom plate under the filtration of the multistage filter grids, and impurities on the bottom plate are discharged to the outside of the tank body by the first sewage pump; after filtered rainwater enters the water purification tank, the rainwater is further filtered under the action of the silica sand water inlet well chamber and the silica sand water outlet well chamber, finally the rainwater enters the regulation and storage tank and is discharged out of the regulation and storage tank after being adsorbed by the inorganic heavy metal ions by the adsorption material, and the purification degree of the rainwater is improved through physical filtration of the high-efficiency filtration tank and the water purification tank and adsorption treatment in the regulation and storage tank.

Preferably, a sand setting chamber is arranged below the water inlet well chamber, and a second sewage pump is arranged in the sand setting chamber.

Through adopting above-mentioned technical scheme, the rainwater is by sand setting chamber flow direction well chamber of intaking, and silt that carries in the rainwater subsides in sand setting chamber, and the second dredge pump passes through the pipeline with silt and discharges.

Preferably, an overflow pipe is arranged on the outer wall of the efficient filtering tank at a position higher than the overflow water level line, an overflow valve is mounted on the overflow pipe, and the overflow valve is electrically connected with the central control system.

Through adopting above-mentioned technical scheme, when the rainwater water level in the high-efficient filtering ponds was higher than the overflow water level line, the rainwater was drained away through the overflow pipe. The overflow valve is opened only when the water level in the high-efficiency filter tank is higher than the overflow water level line, and is closed in other time periods, so that backflow is avoided.

Preferably, the filtering particle size of the filtering grids is gradually reduced towards the direction close to the inner wall, and the number of the first sewage draining pumps is equal to that of the filtering grids.

Through adopting above-mentioned technical scheme for the particulate matter in the rainwater is filtered step by step along the rivers direction, and the particulate matter that each grade was filtered is discharged by independent dredge pump.

Preferably, a spray washing system for cleaning the filter grids is arranged in the high-efficiency filter tank, the spray washing system is located on the opposite outer wall and inner wall, and the spray washing system is electrically connected with the central control system.

Through adopting above-mentioned technical scheme, the spray rinsing system mainly used washs the filter grid, will filter the impurity that the back stayed on the filter grid to the rainwater and wash down.

Preferably, a drain pipe is arranged on the outer wall of the storage tank, a drain pump is mounted on a bottom plate in the storage tank and communicated with the drain pipe, and the drain pump is electrically connected with the central control system.

Through adopting above-mentioned technical scheme, the rainwater in the regulation pond is utilized to convenient the extracting at any time of setting up of drain pipe and drain pump.

The application provides a construction process of silica sand retaining clean water reservoir adopts following technical scheme:

a construction process of a silica sand water storage and purification pool comprises the following steps.

S1, construction preparation, measuring and marking, and determining the positions of buildings according to design requirements;

s2, excavating and supporting a foundation pit, wherein layered excavation and layered supporting are sequentially adopted during excavation, the upper part of the foundation pit naturally slopes and is supported by a soil nail wall, the lower part of the foundation pit adopts a steel sheet pile structure for water stopping and supporting, and foundation pit drainage and precipitation work is well done;

s3, pouring a bottom plate, pouring construction is carried out on the bottom plate in sections, after pouring is finished, a plastic film is covered within 12 hours, and maintenance is carried out for not less than 7 days;

s4, constructing a concrete wall and a column, wherein the outer wall is cast by impervious concrete, and the inner wall is cast by non-impervious concrete; after the outer wall is poured, laying waterproof geomembranes on the inner side and the outer side;

s5, constructing a silica sand well chamber, wherein the well chamber is built by silica sand honeycomb building blocks from bottom to top in sequence

Aerated building blocks are filled between the well chamber and the wall body;

s6, pouring concrete beams and a top plate, wherein a top plate template in the water purification tank is supported by a well chamber and is left in the tank body and is not taken out;

s7, constructing the breathable anti-seepage blanket, wherein after the strength of the top plate meets the requirement, a protective layer is paved on the surface of the top plate, and then the breathable anti-seepage blanket is paved on the protective layer;

s8, backfilling construction, namely, immediately performing backfilling operation after the laying of the breathable impermeable blanket is finished, and performing vibration compaction, wherein the compaction degree is not less than 92%; and backfilling soil between the outer wall and the pit wall of the foundation pit, and then pulling out the steel sheet pile.

By adopting the technical scheme, the construction of the silica sand water storage and purification tank is realized, and the support stability of the construction foundation pit and the waterproof and anti-seepage capability of the tank body are ensured.

Preferably, in S3, a ventilation and seepage-proofing grid is reserved on the bottom plate, and medium coarse sand, ventilation and seepage-proofing sand and pervious concrete are sequentially laid in the ventilation and seepage-proofing grid from bottom to top.

By adopting the technical scheme, the water body is prevented from seeping downwards on the basis of ensuring the ventilation of the bottom plate.

Preferably, in S4, when the wall concrete is poured, the non-gravel mortar or 1:2 cement mortar in the same ratio as the wall concrete is uniformly poured.

Through adopting above-mentioned technical scheme, avoid the root rotten root problem to appear in the wall body root.

Preferably, in S7, the protective layer is coarse sand with a thickness of 40-60 mm, and the mud content of the coarse sand is less than 5%.

By adopting the technical scheme, the breathable impermeable blanket has a good protection effect, and the breathable impermeable blanket is prevented from being damaged.

In summary, the present application includes at least one of the following beneficial technical effects:

1. the rainwater is subjected to multiple filtration of the high-efficiency filter tank and the clean water tank and adsorption treatment of the adsorption material in the regulating and storing tank, so that the purification degree of the rainwater is obviously improved;

2. a sand setting chamber is arranged below the water inlet well chamber, so that rainwater can be further precipitated while being filtered in the water purifying tank;

3. through the alternate arrangement of well chamber of intaking and well chamber of going out for the rainwater obtains better filter effect in the water purification tank.

Drawings

Fig. 1 is a schematic diagram of the internal structure of a silica sand water storage and purification pond according to an embodiment of the application.

Fig. 2 is a plan view of a clean water reservoir of a silica sand impounded water reservoir according to an embodiment of the present application.

Fig. 3 is a schematic diagram of the relative positions of a water inlet well chamber and a water outlet well chamber of a silica sand water storage clean water reservoir in an embodiment of the application.

Fig. 4 is a flow chart of a construction process of a silica sand water storage and purification pond according to an embodiment of the application.

Fig. 5 is a schematic view of a foundation pit support of the construction process of the silica sand water storage and purification tank of the embodiment of the application.

Fig. 6 is a schematic structural diagram of a base plate of a construction process of a silica sand water storage clean water basin according to an embodiment of the present application.

Description of reference numerals: 1. a tank body; 11. a base plate; 111. grid; 12. an outer wall; 13. an inner wall; 14. a top plate; 15. a water inlet pipe; 16. a water outlet pipe; 17. a drain pipe; 18. an overflow pipe; 2. a high-efficiency filter tank; 21. a first filter grid; 22. a second filter grid; 23. a first sewage discharge pump; 24. a first water pipe; 25. a spray rinsing system; 3. a clear water tank; 31. a water inlet well chamber; 32. a water outlet well chamber; 33. a sand setting chamber; 34. a water inlet flow line; 35. an effluent flow line; 36. a second dredge pump; 4. a regulation and storage tank; 41. an adsorption tank; 42. a second water passage pipe; 43. an overflow weir; 44. draining pump; 5. an overflow waterline; 6. an aerated building block.

Detailed Description

The present application is described in further detail below with reference to figures 1-6.

The embodiment of the application discloses a silica sand water storage and purification tank. Referring to fig. 1 and 2, the silica sand water storage and purification tank comprises a tank body 1 positioned below backfill soil and a central control system for controlling the change and treatment of rainwater in the tank body 1. The tank body 1 comprises a bottom plate 11, an outer wall 12 and a top plate 14. The bottom plate 11, the outer wall 12 and the top plate 14 enclose a water storage and purification space. The bottom plate 11, the outer wall 12 and the top plate 14 are all of reinforced concrete structures.

The inside of the tank body 1 is provided with an inner wall 13 which divides the tank body 1 into a high-efficiency filtering tank 2, a clean water tank 3 and a regulation and storage tank 4 along the length direction. The top end of the inner wall 13 is sealed with the top plate 14, and the bottom end of the inner wall 13 is sealed with the bottom plate 11. And water level sensors are arranged in the high-efficiency filtering tank 2, the water purifying tank 3 and the storage regulating tank 4 and are electrically connected with a central control system. The central control system can display the water levels in the high-efficiency filter tank 2, the clean water tank 3 and the storage tank 4 in real time.

A first filtering grid 21 far away from the inner wall 13 and a second filtering grid 22 close to the inner wall 13 are arranged at intervals between the opposite outer wall 12 and the inner wall 13 in the high-efficiency filtering tank 2. The filtering particle size of the second filtering grid 22 is smaller than that of the first filtering grid 21.

The secondary grid filtration intercepts most of the particles in the rainwater and enables the particles to settle at the bottom of the high-efficiency filter tank 2.

The height of the first filtering grid 21 and the height of the second filtering grid 22 are both higher than the designed overflow water level line 5. An inlet pipe 15 and an overflow pipe 18 are provided on the outer wall 12 opposite to the first filtering grid 21. The inlet pipe 15 is located at the lower part of the outer wall 12 and the overflow pipe 18 is located above the overflow water level line 5. The water inlet pipe 15 is connected with an urban rainwater system and introduces rainwater into the pool body 1. When the rainwater level in the high-efficiency filter tank 2 is higher than the overflow water level line 5, the rainwater is drained through the overflow pipe 18.

An electromagnetic overflow valve is mounted on the overflow pipe 18. The electromagnetic overflow valve is electrically connected with the central control system. The overflow valve is opened only when the water level in the high-efficiency filter tank 2 is higher than the overflow water level line 5, and is closed in other time periods, so that backflow is avoided.

And a spray washing system 25 is fixedly arranged on the opposite outer wall 12 and the inner wall 13 in the high-efficiency filter tank 2. The spray washing system 25 is mainly used for washing the first filter grid 21 and the second filter grid 22, and washing down impurities left on the first filter grid 21 and the second filter grid 22 after rainwater is filtered. The spray washing system 25 is electrically connected with the central control system.

The bottom plate 11 is provided with a first sewage pump 23 between the first filtering grid 21 and the outer wall 12 and between the first filtering grid 21 and the second filtering grid 22, and the first sewage pump 23 is communicated with the outside through a sewage pipe. The first dredge pump 23 discharges the impurities filtered by the first and

second filtering grids

21 and 22. The first dredge pump 23 is electrically connected with the central control system.

The lower part of the inner wall 13 between the high-efficiency filtering tank 2 and the clean water tank 3 is provided with a first water pipe 24 for communicating the high-efficiency filtering tank 2 and the clean water tank 3. And a second water through pipe 42 for communicating the clean water tank 3 and the regulation tank 4 is arranged at the lower part of the inner wall 13 between the clean water tank 3 and the regulation tank 4.

The first water pipe 24 and the second water pipe 42 are both provided with control electromagnetic valves, and the control electromagnetic valves are electrically connected with the central control system. The rainwater levels in the high-efficiency filtering tank 2, the clean water tank 3 and the regulating and storing tank 4 can be adjusted by turning on and off the control electromagnetic valve through the central control system.

An adsorption tank 41 is fixedly arranged in the regulation tank 4 at the position of the second water through pipe 42, and an adsorption material for adsorbing heavy metal ions is filled in the adsorption tank 41.

Rainwater entering the storage tank 4 firstly passes through the adsorption tank 41, and soluble pollutant ions such as heavy metals contained in the rainwater are adsorbed, so that the rainwater is further purified.

An overflow weir 43 is fixed on the outer wall 12 of the storage tank 4 opposite to the inner wall 13, and the top end of the overflow weir 43 is flush with the overflow water level line 5. An outlet pipe 16 is arranged at the position of the outer wall 12 opposite to the overflow weir 43. When the water level in the storage tank 4 exceeds the overflow water level line 5, the rainwater passing over the overflow weir 43 is discharged through the water outlet pipe 16.

A drain pipe 17 is provided at a position below the overflow weir 43 at the lower portion of the outer wall 12. A drain pump 44 is fixed to the bottom plate 11 in the storage tank 4, and the drain pump 44 communicates with the drain pipe 17. The drain pump 44 is electrically connected to the central control system.

The arrangement of the drain pipe 17 and the drain pump 44 is convenient for extracting the rainwater in the regulating reservoir 4 at any time for utilization.

The clean water tank 3 is internally provided with a water inlet well chamber 31 and a water outlet well chamber 32 which are alternately arranged along the width direction of the tank body 1. The water inlet well chamber 31 and the water outlet well chamber 32 are both formed by building hexagonal silica sand building blocks from bottom to top. The partition between the inlet well chamber 31 and the outlet well chamber 32 is a filtering interface for rainwater. The spaces between the water inlet well chamber 31 and the water outlet well chamber 32 and the outer wall 12 and the inner wall 13 are filled with the aerated building blocks 6, so that the water inlet well chamber 31 and the water outlet well chamber 32 are reinforced.

Referring to fig. 2 and 3, a sand settling chamber 33 is provided below the water inlet well chamber 31, and the water inlet well chamber 31 is supported on the sand settling chamber 33. The bottom end of the water inlet well chamber 31 is communicated with the sand settling chamber 33. The outlet well chamber 32 is directly fixed on the bottom plate 11.

Rainwater entering the clean water tank 3 through the first water pipe 24 first enters the sand settling chamber 33, and along with the increase of the rainwater level, the rainwater enters the water inlet well chamber 31, and silt carried in the rainwater is settled in the sand settling chamber 33 in the period. A second dredge pump 36 is fixed in the sand settling chamber 33 to discharge the silt through the pipeline.

After entering the water inlet well chamber 31, the rainwater is quickly filled in the water inlet well chamber 31 through the low holes, a filtering interface is arranged between the water inlet well chamber 31 and the water outlet well chamber 32, the rainwater enters the water outlet well chamber 32 after being filtered by the filtering interface, the rainwater can be filtered and purified after passing through a silica sand water filtering wall body layer, the water outlet well chambers 32 are mutually connected through the low holes, and the rainwater enters the storage tank 4 through the second water communication pipe 42 at the terminal.

The incoming flow lines 34 of rainwater between the inlet well chambers 31 and the outgoing flow lines 35 between the outlet well chambers 32 are shown in figure 2.

The silica sand retaining clean water reservoir of this application is through the filtration bars in the high efficiency filter tank 2 and the silica sand well room in the clean water reservoir 3 filter and the absorption in the regulation pond 4 handle, is showing and is improving water purification ability, guarantees that the discharged rainwater can reach the requirement after handling, satisfies the demand of society.

The embodiment of the application discloses a construction process of a silica sand water storage and purification tank. Referring to fig. 4, the construction process of the silica sand water storage and purification pond comprises the following steps:

s1, preparation for construction

The silica sand water storage and purification tank in the embodiment is positioned below the natural water body, and the natural water body needs to be pumped and drained before construction for dredging treatment.

Constructors and equipment enter a field, measure and pay off, determine the construction position and the construction sequence of each building structure, monitor and complete the early preparation work of construction.

S2, excavating and supporting foundation pit

The excavation depth of the foundation pit in the embodiment is 7.5m, and the size is 240 × 150 m. And when the foundation pit is excavated, excavating and supporting in layers from top to bottom. And (3) with reference to the figure 5, naturally putting the upper part of the foundation pit on a slope with a slope ratio of 1:0.5, adopting a soil nailing wall structure for supporting, adopting a steel sheet pile structure for water stopping and supporting at the lower part, building a water retaining wall at the top of the slope, and arranging a drainage ditch outside the water retaining wall. The steel sheet piles effectively prevent groundwater from permeating into the foundation pit outside the foundation pit, and the steel sheet piles are used as waterproof curtains and improve the soil body of the side slope of the foundation pit, so that the safety of the side slope of the foundation pit and surrounding buildings is guaranteed.

Specifically for first layer earthwork excavation depth is 2m, excavate the second floor when waiting that first layer soil nail wall reaches intensity, excavation depth is 2m, begin to construct the steel sheet pile after the second floor excavation is accomplished, wait to excavate the third floor after the steel sheet pile construction is accomplished, excavation depth is 3.2m, and the bottom is reserved 0.3m and is adopted the manual work and repair to in time manual work and build escape canal and water collection well, prevent that the foundation ditch bottom ponding from soaking. When the steel sheet pile is constructed, a vibration hammer which has little influence on the surrounding environment is adopted for construction. And (4) performing waterproof treatment on the junction of the steel sheet piles, for example, plugging by adopting a cotton wool mixed adhesive.

And (5) well point dewatering treatment is timely carried out after the foundation pit excavation is finished, and a dewatering well is arranged.

S3 construction of reinforced concrete bottom plate

Before the construction of the reinforced concrete bottom plate 11, a dry well and a depressurization well in a foundation pit are sealed, and plain concrete is poured into a well pipe during well sealing and directly sealed under a bottom plate cushion layer.

S31, pouring the bottom plate cushion layer

The bottom plate cushion layer concrete is made of pervious concrete materials. The pervious concrete is fast in initial setting and must be paved in time, so that the pervious concrete is poured in a blocking and separating mode, and the loose coefficient of the concrete is 1.1. The concrete that will permeate water evenly paves on the working face, finds the roughness and controls certain pan degree with the bar chi, dull and stereotyped vibrator or artifical tamping, and the low frequency vibration is adopted in the vibration, prevents too closely knit segregation phenomenon that appears. And after the paving is finished, maintaining for 14-21 days.

S32, constructing a bottom plate

A waterproof geomembrane is laid on the bottom mat layer and extends no less than 300mm outside the bottom plate 11. And pouring construction is performed on the bottom plate 11 in sections. Referring to fig. 6, when the groundwater level is 1m or more lower than the bottom plate 11, a ventilation and seepage-proofing grid 111 is reserved on the bottom plate 11. And medium coarse sand and breathable impermeable sand with the thickness of 30-50 mm are sequentially paved in the grid 111 from bottom to top, and the upper part of the impermeable sand is leveled by using permeable concrete. The area of the grid 111 should account for 20% -30% of the total area of the bottom plate 11. And a permeable geotextile is laid between the permeable impermeable sand and the permeable concrete. Each layer needs to be uniformly compacted.

After the bottom plate 11 is poured, a plastic film is laid after 12 hours, and watering and curing are carried out properly to keep the concrete to have a sufficient wet state, wherein the curing period is not less than 7 days.

S4 construction of concrete wall and column

After the concrete strength of the bottom plate 11 meets the requirement, the measurement and the paying-off are carried out, a steel bar structure is arranged and a wall body template is erected after the position of a wall body is determined, and then the concrete pouring is carried out. And when the strength of the concrete reaches 1.2MPa, removing the template.

When the wall concrete is poured, firstly, uniformly pouring mortar which is not provided with stones or 1:2 cement mortar and has the same proportion with the wall concrete, and placing a spade into a mold so as to avoid the root rot problem of the root of the wall.

And pouring the wall concrete to the position 30mm above the beam bottom or the plate bottom, and then picking the wall concrete to the position 5mm above the beam bottom or the plate bottom.

The outer wall 12 is cast with impervious concrete and the inner wall 13 is cast with non-impervious concrete. The speed in the concrete pouring process is strictly controlled to be about 1.5m/h, and the increase of the side pressure of the template caused by the over-high pouring speed is prevented. For the dense part of the reinforcing steel bars of the wall body and the lintel, a small-diameter vibrating rod is preferably adopted for vibration (phi 30), but the pouring height and the pouring interval are required to be paid attention to, and the vibration is enhanced, so that the pouring quality of concrete is ensured.

Waterproof geomembranes are paved on the outer side and the inner side of the outer wall 12, and a waterproof effect is further achieved.

S5 construction of silica sand rainwater well chamber

The bottom plate 11 is leveled, the measurement and the setting are carried out, the positions of the rainwater well chambers (the water inlet well chamber 31 and the water outlet well chamber 32) are determined, and then the sand setting chamber 33 and the rainwater well chambers are built. The rainwater well chamber is built by adopting hexagonal silica sand honeycomb building blocks from bottom to top in sequence.

Gaps between the wall body and the rainwater well chamber are filled with aerated building blocks 6, and the aerated building blocks 6 are bonded by cement mortar.

S6 construction of concrete beam and top plate

After the silica sand honeycomb building blocks inside the pool body 1 are built, the building blocks are used as supports, glued wood templates with the thickness of 20mm are paved on the building blocks, then top plates 14 are bound, reinforced bars are poured with concrete, and the templates are left in the pool body 1 and are not taken out.

The top plate 14 and the beam concrete pouring route are continuously poured from one end. The concrete blanking points are preferably distributed, and the distance is controlled to be about 2 meters.

When the top plate 14 and the beam are poured simultaneously, in order to prevent bleeding from entering the beam mold, the beam is poured to the height of the bottom of the top plate 14, and then the top plate 14 concrete is poured in a large area.

S7 construction of air-permeable anti-seepage blanket

After the strength of the top plate 14 meets the requirement, coarse sand with the thickness of 50mm is paved on the surface of the top plate 14, and the coarse sand is paved to be uniform and compact in thickness; the mud content of the coarse sand is not more than 5 percent. Then laying the breathable impermeable blanket, wherein the connection of the breathable impermeable blanket materials adopts a lap joint mode. The lapping width of the air-permeable seepage-proofing blanket is about 20 cm.

S8 construction of backfill soil protection layer

And after the laying of the anti-seepage blanket is finished, constructing a backfill protective layer immediately. The earth covering backfill adopts a construction mode that a dump truck directly occupies, the bulldozer is smooth, and is compacted by vibration rolling, and the compaction degree is not less than 92%.

And backfilling soil between the outer wall 12 and the pit wall of the foundation pit, and pulling out the steel sheet piles.

During construction, various holes are reserved and related facilities of the water storage and purification pond are matched well.

And finally, the natural water body is drained back to the upper part of the water storage and purification pool.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims

1. The utility model provides a silica sand retaining water purification tank, includes cell body (1) and carries out the center control system who regulates and control to rainwater in cell body (1), its characterized in that: the pool body (1) comprises a bottom plate (11), an outer wall (12) and a top plate (14) which enclose and limit a water storage and purification space, the inside of the pool body (1) is sequentially divided into a high-efficiency filtering pool (2), a water purification pool (3) and a regulation and storage pool (4) by an inner wall (13), and the high-efficiency filtering pool (2), the water purification pool (3) and the regulation and storage pool (4) are communicated; a water inlet pipe (15) is arranged on an outer wall (12) opposite to the inner wall at the position of the high-efficiency filter tank (2), and a multi-stage filter grid and a first sewage draining pump (23) are arranged between the opposite outer wall (12) and the inner wall (13); a plurality of silica sand water inlet well chambers (31) and a plurality of silica sand water outlet well chambers (32) which are alternately arranged and tightly attached for filtering rainwater are arranged in the water purifying tank (3); an adsorption groove (41) filled with an adsorption material for adsorbing inorganic heavy metal ions in rainwater is arranged in the regulation and storage tank (4), a water outlet pipe (16) is arranged on an outer wall (12) opposite to the inner wall (13) at the regulation and storage tank (4), and the rainwater is treated by the adsorption material in the adsorption groove (41) and then is discharged by the water outlet pipe (16); water level sensors are arranged in the high-efficiency filtering tank (2), the water purifying tank (3) and the storage regulating tank (4), and the water level sensors are electrically connected with a central control system; the filter grid is higher than the overflow water level line (5).

2. The silica sand water storage and purification pond according to claim 1, which is characterized in that: a sand setting chamber (33) is arranged below the water inlet well chamber (31), and a second sewage pump (36) is arranged in the sand setting chamber (33).

3. The silica sand water storage and purification pond according to claim 1, which is characterized in that: an overflow pipe (18) is arranged on the outer wall (12) of the high-efficiency filter tank (2) at a position higher than the overflow water line (5), an overflow valve is mounted on the overflow pipe (18), and the overflow valve is electrically connected with the central control system.

4. The silica sand water storage and purification pond according to claim 1, which is characterized in that: the radial direction that is close to interior wall (13) of the filter sieve is the direction taper, the quantity (23) of first trash pump (23) are equal with the quantity of filter sieve.

5. The silica sand water storage and purification pond according to claim 1, which is characterized in that: the efficient filtering tank (2) is internally provided with a spray washing system (25) for cleaning the filtering grids, the spray washing system (25) is positioned on the outer wall (12) and the inner wall (13) which are opposite, and the spray washing system (25) is electrically connected with the central control system.

6. The silica sand water storage and purification pond according to claim 1, which is characterized in that: be provided with drain pipe (17) on outer wall (12) of regulation pond (4) department, install drain pump (44) on bottom plate (11) in regulation pond (4), drain pump (44) and drain pipe (17) intercommunication, drain pump (44) are connected with central control system electricity.

7. A process for constructing a silica sand reservoir as defined in any one of claims 1 to 6, wherein the process comprises:

s1, construction preparation, measurement and setting-out, and determining the positions of buildings according to design requirements;

s3, pouring the bottom plate, and pouring construction is carried out on the bottom plate (11) in sections, after pouring is finished, a plastic film is covered within 12 hours, and maintenance is carried out for not less than 7 days;

s4, constructing concrete walls and columns, wherein the outer wall (12) is cast by impervious concrete, and the inner wall (13) is cast by non-impervious concrete; after the outer wall (12) is poured, waterproof geomembranes are paved on the inner side and the outer side;

An aerated building block (6) is filled between the well chamber and the wall body;

s6, pouring concrete beams and a top plate, wherein a top plate (14) template in the clean water tank (3) is supported by a well chamber, and the template is left in the tank body (1) and is not taken out;

s7, constructing the breathable anti-seepage blanket, wherein after the strength of the top plate (14) meets the requirement, a protective layer is paved on the surface of the top plate (14), and then the breathable anti-seepage blanket is paved on the protective layer;

s8, backfilling construction, namely, immediately performing backfilling operation after the laying of the breathable impermeable blanket is finished, and performing vibration compaction, wherein the compaction degree is not less than 92%; and backfilling soil between the outer wall (12) and the pit wall of the foundation pit, and then pulling out the steel sheet piles.

8. The silica sand water storage and purification pond according to claim 7, which is characterized in that: in S3, a ventilation and seepage-proof grid (111) is reserved on the bottom plate (11), and medium coarse sand, ventilation and seepage-proof sand and pervious concrete are sequentially paved in the ventilation and seepage-proof grid (111) from bottom to top.

9. The silica sand water storage and purification pond according to claim 7, which is characterized in that: in S4, when the wall concrete is poured, the mortar without stone or 1:2 cement mortar is uniformly poured in the same proportion as the wall concrete.

10. The silica sand water storage and purification pond according to claim 7, which is characterized in that: in S7, the protective layer is coarse sand with the thickness of 40-60 mm, and the mud content of the coarse sand is less than 5%.