CN211898784U - A sunken green space drainage structure for sponge city - Google Patents

Abstract

The utility model discloses a sunk greenbelt drainage structure for sponge cities, which comprises a plurality of overflow wells, wherein the overflow wells sequentially pass through a vegetable layer, a soil layer, a gravel layer and a gravel layer from top to bottom, and the bottoms of the overflow wells directly reach a lime soil compaction layer; the side wall of the overflow well is communicated with a perforated drain pipe which is laid between the lime soil compacted layer and the gravel layer; the parts of the overflow well, which are positioned on the vegetation layer, the soil layer, the sand stone layer and the gravel layer, are poured by using water-permeable concrete, and the parts, which are positioned on the lime soil compaction layer, are poured by using water-impermeable concrete; and adjacent overflow wells are communicated by a rainwater drainage pipe. The drainage structure of the utility model is used for pouring the water permeating part of the overflow well and the water impermeable concrete part of the overflow well, which is beneficial to the rapid infiltration, collection and storage of the runoff rainwater; the prefabricated baffle in perforation drain pipe both ends has increased the regulation volume of perforation drain pipe, and the collection when the discharge rainwater holds partly infiltration rainwater and supplies vegetation, promotes the effective utilization of rainwater.

Description

A sunken green space drainage structure for sponge city

technical field

The utility model belongs to the technical field of sponge city drainage facilities, in particular to a sunken green space drainage structure for sponge cities.

Background technique

In recent years, with the rapid development of urbanization in my country, urban gray buildings have been increasing, and the proportion of impervious areas has increased, which has destroyed the hydrological cycle of the city. The traditional urban rainwater drainage system has been unable to meet the needs of new urbanization development, resulting in urban Waterlogging and other disasters occur frequently.

The proposal of the concept of sponge city provides a new idea for urban development and comprehensive response to urban water problems. Through various technologies such as "infiltration, stagnation, storage, purification, utilization, and drainage", it can realize a benign urban hydrological cycle and maintain or restore urban water. "Sponge" function.

However, the existing anti-seepage concave green space rainwater management and control methods have the following main problems: the demand for soil moisture for the growth of green space plants is not fully considered, the infiltration and drainage effects are obvious, and the stagnation, storage, and water use are not effective; concave type. The structural form of the drainage pipes in the green space structure layer is not conducive to the storage and utilization of rainwater; the layout of the drainage pipes is single, and the water collection function is insufficient; the material of the drainage pipes needs to be improved to improve its reliability and service life.

Utility model content

The purpose of the utility model is to provide a sunken green space drainage structure for sponge city, which can effectively exert the regulation effect of urban green space on the seepage, stagnation, storage, purification, utilization and drainage of runoff rainwater, and improve the rainwater source of the sunken green space. The functions of reducing and utilizing rainwater can also prevent the occurrence of urban waterlogging.

The technical scheme adopted by the utility model is that a sinking type green space drainage structure for sponge city includes a plurality of overflow wells, and the overflow wells pass through the vegetation layer, the soil layer, the sandstone layer and the Gravel layer, the bottom of the overflow well directly reaches the lime-soil compaction layer; the side wall of the overflow well is connected with a perforated drainage pipe, which is laid between the lime-soil compaction layer and the gravel layer; the overflow well is located in the vegetation layer and the soil layer Parts of the sandstone layer and gravel layer are poured with permeable concrete, and the part located in the lime-soil compaction layer is poured with impermeable concrete; the adjacent overflow wells are connected by rainwater drainage pipes.

The utility model is characterized in that:

The diameter of the rainwater drainage pipe is larger than the diameter of the perforated drainage pipe laid around the overflow well, the diameter of the perforated drainage pipe is 200mm, and the diameter of the rainwater drainage pipe is 300mm.

Perforated drains are laid evenly with a 1% slope factor.

The top of the overflow well is 15cm higher than the vegetation layer, and a groove is reserved at the top of the overflow well when pouring, and the groove is used to place the stainless steel drainage grate.

The perforated drainage pipe is evenly provided with a plurality of permeable holes, and the perforated drainage pipe is also covered with a layer of anti-seepage filter net.

The perforated drainage pipe is arranged along the axial direction of the rainwater drainage pipe at ±45 degrees.

The thickness of the soil layer is 450mm, the thickness of the sand layer is 100mm, and the thickness of the gravel layer is 250mm.

A layer of impermeable membrane is also laid on the lime-soil compaction layer, and the impermeable membrane is located under the perforated drainage pipe.

The perforated drain pipes are all factory prefabricated concrete perforated pipes.

The perforated drainage pipes are all factory prefabricated concrete perforated drainage pipes; the upper part of the perforated drainage pipe is a prefabricated concrete perforated structure, and the lower half is a prefabricated concrete non-perforated structure, which is used to retain and store infiltrating rainwater.

The two ends of the perforated drainage pipe are prefabricated with semi-circular baffles, the purpose of which is to collect infiltrated rainwater.

The beneficial effect of the utility model is that the sunken green space drainage structure for sponge city of the utility model has the following beneficial effects:

(1) By pouring the permeable concrete and non-permeable concrete set on the overflow well body, it is conducive to the infiltration and collection of runoff rainwater, and can effectively prevent impurities such as gravel from entering the overflow well body, avoiding rainwater Collect in the planting soil layer to further improve the water seepage capacity of the sunken green space to reduce surface runoff.

(2) The anti-seepage membrane arranged outside the perforated drainage pipe plays a certain role in filtering and purifying the infiltrated rainwater, so as to collect and retain water, improve the comprehensive utilization efficiency of water, and promote the recycling of rainwater.

(3) The 1% gradient coefficient set by the utility model facilitates the collection and utilization of rainwater flowing into the overflow well, and the selected prefabricated perforated drainage pipe has good economic benefits and use value.

(4) Compared with the existing perforated drainage pipes on the market, the upper half of the perforated drainage pipe provided by the present invention is a prefabricated concrete perforated structure, and the lower half of the perforated drainage pipe is a prefabricated concrete non-perforated structure, Its purpose is the retention and collection of infiltration rainwater.

(5) Semi-circular baffles are prefabricated at both ends of the perforated drainage pipe, which can collect infiltration rainwater, meet the water demand for the growth of surface plants and relieve the downstream drainage and storage pressure.

Description of drawings

Fig. 1 is the structural representation of the sink-type green space drainage structure of a kind of sponge measure of the present utility model;

Fig. 2 is the distribution structure diagram of overflow wells, perforated drainage pipes and rainwater drainage pipes of a sinking type green space drainage structure of a sponge measure of the present invention;

3 is a schematic diagram of the end structure of the perforated drainage pipe of a sinking green space drainage structure based on the sponge city technology of the present invention.

In the figure, 101. Vegetation layer. 102. Soil layer, 103. Sand layer, 104. Gravel layer, 105. Perforated drainage pipe, 106. Anti-seepage membrane, 107. Lime soil compaction layer, 108. Overflow well, 109. Anti-seepage screen, 110. Rainwater drain, 111. Semicircular baffle.

Detailed ways

The present utility model will be described in detail below with reference to the accompanying drawings and specific embodiments.

A sunken green space drainage structure for a sponge city of the present invention is shown in FIG. 1 , including a number of appropriately distributed overflow wells 108 , and the overflow wells 108 pass through the vegetation layer 101 and the soil layer in sequence from top to bottom. 102, the sandstone layer 103 and the gravel layer 104, the bottom of the overflow well 108 directly reaches the lime soil compaction layer 107; the side wall of the overflow well 108 is also connected with a perforated drainage pipe 105, and the perforated drainage pipe 105 is laid on the lime soil compaction layer 107 and the gravel layer 104; the part of the overflow well 108 located in the vegetation layer 101, the soil layer 102, the sand layer 103 and the gravel layer 104 is poured with permeable concrete, and the part located in the lime-soil compaction layer 107 is poured with impermeable concrete; A rainwater drainage pipe 110 is used to communicate between adjacent overflow wells 108 .

The diameter of the rainwater drainage pipe 110 is larger than that of the perforated drainage pipe 105 entering the overflow well 108 , the diameter of the perforated drainage pipe 105 is 200 mm, and the diameter of the rainwater drainage pipe is 300 mm.

The perforated drain pipes 105 are evenly laid with a slope factor of 1%.

The top of the overflow well 108 is 15 cm higher than the vegetation layer, and a groove is reserved at the top of the overflow well 108 for pouring, and the groove is used for placing stainless steel drainage grates.

The perforated drainage pipe 105 is evenly provided with a number of water permeable holes, and the perforated drainage pipe 105 is also covered with a layer of anti-seepage filter screen 109 .

The thickness of the soil layer 102 is 450 mm, the thickness of the sandstone layer 103 is 100 mm, and the thickness of the gravel layer 104 is 250 mm.

As shown in FIG. 2 , the perforated drainage pipes 105 are arranged along the axial direction of the rainwater drainage pipes 110 at ±45 degrees.

A layer of impermeable membrane 106 is also laid on the lime-soil compaction layer 107 , and the impermeable membrane 106 is located under the perforated drainage pipe 105 .

The perforated drainage pipes 105 are all factory prefabricated concrete perforated drainage pipes; the upper part of the perforated drainage pipe 105 is a prefabricated concrete perforated structure, and the lower half of the perforated drainage pipe 105 is a prefabricated concrete non-perforated structure.

As shown in Figure 3, the end of the perforated drain pipe 105 near the overflow well 8 is prefabricated with a semicircular baffle 111, and the semicircular baffle 111 is located in the lower half of the perforated drain pipe. With the semicircular baffle, It can collect and store part of the infiltrated rainwater, provide the water needed for the growth of surface plants and relieve the downstream drainage and storage pressure.

The working process of the sunken green space drainage structure for a sponge city of the present invention is as follows:

A sunken green space drainage structure includes, from top to bottom, a vegetation layer 101, a 450mm thick planting soil layer 102, a 100mm sandstone layer 103, a 250mm gravel layer 104, a perforated drainage pipe 105, an anti-seepage filter screen 106, and lime soil compaction Layer 107. The overflow well body has water permeability and filtering functions. When surface runoff or passenger flow occurs, the sunken green space drainage structure can absorb surface runoff and passenger flow, and can prevent urban waterlogging. After the rainwater enters the sunken green space, it reaches the sandstone layer 103 through the planting soil layer 102 and the infiltrated rainwater is filtered through the sandstone layer 103. The gradient coefficient of % is evenly laid around the overflow well, and the filtered rainwater is drained to the overflow well through the perforated drainage pipe, and finally collected and stored by the DN300 rainwater drainage pipe.

When in use, the water permeability of the overflow well body and the anti-seepage filter screen set on the outsourcing of the drainage pipe play a certain role in filtering and purifying the infiltrated rainwater, which is conducive to the rapid infiltration, collection and purification of runoff rainwater. Collection and storage, thereby further improving the water absorption capacity of the sunken green space, reducing surface runoff, improving the comprehensive utilization efficiency of water, and promoting the recycling of rainwater.

The part below the plain soil layer where the overflow well is located is poured with traditional impervious concrete to prevent rainwater infiltration from damaging the basic plain soil layer; the part above the plain soil layer where the overflow well is located is poured with permeable concrete, which can not only speed up the infiltration of rainwater, but also And it can also play the role of filtration and purification. The overflow well made of concrete can avoid the collapse of the side wall of the drainage structure, and can also withstand the impact of long-term water flow inside the overflow well, and the structure is safe, reliable and stable.

The diameter of the rainwater drainage pipe in the overflow well is larger than the diameter of the perforated drainage pipe laid around the overflow well. of congestion.

A DN200 concrete perforated drainage pipe is laid above the impermeable membrane, and the perforated drainage pipe is covered with an anti-seepage filter to prevent the penetration of sand and gravel. The perforated drainage pipes are arranged along the direction of the rainwater drainage pipe at ±45 degrees. Compared with the traditional perforated drainage pipes arranged in a crisscross pattern, this arrangement is beneficial to expand the water receiving area, so as to facilitate the collection, storage and storage of infiltrated rainwater. Recycling.

The perforated drainage pipe is made of precast concrete, and its purpose is to reduce the construction cost and improve the service life of the pipe.

Claims (10)

1. A sunk greenbelt drainage structure for a sponge city is characterized by comprising a plurality of overflow wells (108), wherein the overflow wells (108) sequentially penetrate through a vegetation layer (101), a soil layer (102), a sand layer (103) and a gravel layer (104) from top to bottom, and the bottoms of the overflow wells (108) directly reach a lime-soil compacted layer (107); the side wall of the overflow well (108) is also communicated with a perforated drain pipe (105), and the perforated drain pipe (105) is laid between the ash soil compaction layer (107) and the gravel layer (104); the parts of the overflow well (108) positioned on the vegetation layer (101), the soil layer (102), the sand layer (103) and the gravel layer (104) are poured by using water-permeable concrete, and the part positioned on the lime-soil compacted layer (107) is poured by using water-impermeable concrete; the overflow wells (108) are communicated with each other by rainwater drainage pipes (110).

2. The sunk greenbelt drainage structure for sponge cities as claimed in claim 1, wherein the diameter of the rainwater drainage pipe (110) is larger than the diameter of the perforated drainage pipe (105) laid around the overflow well (108), the diameter of the perforated drainage pipe (105) is 200mm, and the diameter of the rainwater drainage pipe (110) is 300 mm.

3. The submerged greenbelt drainage structure for sponge cities as claimed in claim 2, wherein the perforated drainage pipes (105) are uniformly laid in the submerged greenbelt structure layer according to a gradient coefficient of 1%.

4. The submerged greenbelt drainage structure for the sponge city as claimed in claim 1, wherein the top of the overflow well (108) is 15cm higher than the vegetation layer, and a groove is reserved when the top of the overflow well (108) is poured and is used for placing a stainless steel drainage grate.

5. The submerged greenbelt drainage structure for sponge cities as claimed in claim 1, wherein the perforated drainage pipe (105) is uniformly provided with a plurality of water permeable holes, and the perforated drainage pipe (105) is further externally coated with an impermeable screen (109).

6. A sinking greenbelt drainage structure for sponge cities as claimed in claim 1, wherein the perforated drain pipe (105) is arranged along the rainwater drain pipe (110) in the direction of ± 45 degrees in the axial direction.

7. A sponge urban sunken greenbelt drainage structure according to claim 1 wherein the soil layer (102) is 450mm thick, the gravel layer (103) is 100mm thick and the gravel layer (104) is 250mm thick.

8. A sinking greenbelt drainage structure for sponge cities as claimed in claim 1, wherein an impermeable membrane (106) is further laid on the soil compaction layer (107), and the impermeable membrane (106) is positioned below the perforated drainage pipe (105).

9. The submerged greenbelt drainage structure for sponge cities as claimed in claim 1, wherein the perforated drainage pipes (105) are all factory-prefabricated concrete perforated drainage pipes; the upper half part of the perforated drain pipe (105) is a prefabricated concrete perforated structure, and the lower half part of the perforated drain pipe (105) is a prefabricated concrete non-perforated structure.

10. A sinking greenbelt drainage structure for sponge cities as claimed in claim 1, wherein the perforated drain pipe (105) is prefabricated with semicircular baffles (111) at both ends.

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