Underground rainwater outdoor pipe open trench concealed laying disconnection structure

Abstract

The utility model provides a buried rainwater outdoor pipe open trench concealed laying disconnection structure, and belongs to the technical field of sponge cities. The disconnection structure comprises a buried rainwater outlet pipe, an underground drainage open trench, an overflow rainwater port and a trench bottom seepage drainage device, one end of the buried rainwater outlet pipe is connected to a rainwater vertical pipe, and the other end of the buried rainwater outlet pipe is inserted into the underground drainage open trench; according to the disconnection structure, the mode that peak rainfall overflows from the top of a ditch and is discharged into an overflow gutter inlet, and a small amount of initial rain and rainwater retained after rain are drained from a ditch bottom seepage drainage facility in a delayed peak staggering mode is adopted, and the disconnection method that direct connection between a building rainwater outdoor pipe and an outdoor small matched rainwater pipe network is stopped is adopted; on the premise of meeting the requirement of the sponge city design concept for disconnection and connection of the rainwater outlet pipe of the building, the rainwater outlet pipe burying and concealed laying mode is friendly to the landscape environment, the kinetic energy of rainwater can be reduced, and washout damage to greenbelt vegetation is avoided.

Description

Technical Field

[0001] The present application relates to the field of sponge city technology, and in particular to a buried rainwater outlet pipe open ditch concealed installation disconnection structure. Background Art

[0002] Article 4.5.10 (mandatory provision) of the "General Specification for Building Water Supply, Drainage and Water Conservation" GB55020-2021 stipulates: "Outdoor rainwater inlets should be set at the end of rainwater control and utilization facilities and discharged in the form of overflow; rainfall overflow that exceeds the rainwater runoff control requirements shall be discharged into the municipal rainwater pipe." This article clarifies that when organizing the discharge of site rainwater and roof rainwater, the role of sponge facilities must be fully utilized, and organized surface drainage methods should be adopted using the terrain elevation, and the overflow rainwater outlet should be placed at the end of the rainwater control and utilization facilities; roof rainwater should first pass through the source reduction facilities of sponge city construction, such as sunken green spaces, rainwater gardens, permeable pavements and other sponge facilities to fully absorb it, and then be collected into the small supporting rainwater network through the overflow rainwater outlet set at the end, and cannot bypass the sponge facilities and discharge directly into the rainwater network.

[0003] Article 5.1.3 of the Technical Specification for Rainwater Control and Utilization in Buildings and Communities GB50400-2016 stipulates: "Rainwater from the roof should be discharged to the ground rainwater resource utilization ecological facilities in a disconnected manner. When discharged to the building's drainage slope and into the sunken green space, energy dissipation and anti-scouring measures should be taken on the drainage slope." This article not only requires that rainwater from the roof be discharged into sponge facilities such as sunken green spaces and permeable pavements after disconnection; it also requires consideration of rainwater pressure reduction and speed reduction measures to avoid scouring green plants and destroying the greening effect.

[0004] Common rainwater outlet pipe disconnection practices and their disadvantages:

[0005] 1. Open drainage on the slope of drainage. Open drainage on the slope of drainage is the most commonly used method for disconnecting rainwater outlet pipes. Both the downpipe and the internal rainwater riser are openly drained to the slope of drainage above the outdoor ground, and then rectified by a rainwater dustpan and diverted into green space or sunken green space.

[0006] Although this method has a low cost, since there is no restriction on the flow rate of rainwater, the discharged water has the kinetic energy to produce a certain degree of scouring on the green plants near the outlet. In particular, the rainwater outlets on the roofs of high-rise buildings cause particularly serious scouring damage to nearby green spaces. In addition, the 30-45° inclined outlets and exposed rainwater dustpans laid on the ground without any obstruction have a greater negative impact on the landscape environment in high-end real estate projects, which are usually difficult for builders to accept.

[0007] 2. The practice of disconnecting open ditches and concealed drainage on the ground. Open ditches and concealed drainage on the ground refer to outdoor open drainage ditches set up along the perimeter of the building. When the concealed outlet pipe is radially connected to the open ditch, the water flow is forced to change its direction and exhaust when it encounters the obstruction of the ditch wall, and a part of its kinetic energy is correspondingly reduced in the process. The rainwater eventually flows into the green space or sunken green space along the ground outlet holes evenly opened at the bottom of the outer wall of the ditch. Since the total area of ​​the outlet holes on the ground side of the ditch wall is much larger than the cross-sectional area of ​​the rainwater pipe, the kinetic energy of the outflowing rainwater is further reduced.

[0008] This approach can reduce the intensity of rainwater scouring by changing the flow pattern of rainwater and reducing the flow rate of water, and can conceal the rainwater outlet by blocking the rainwater pipe outlet; however, when the outdoor ground drainage ditch is naturally divided into several sections by various ground entrances and exits on the building's exterior facade, it is difficult to coordinate the ground drainage ditch with the surrounding environment of the building through beautification techniques; in addition, when the first-floor exterior encounters floor-to-ceiling windows, the outdoor ground ditch will actually have a negative impact not only on the outdoor landscape, but also on the indoor landscape effect. Utility Model Content

[0009] In order to make up for the above shortcomings, the present application provides a buried rainwater outlet pipe open ditch concealed disconnection structure, which aims to solve the drawbacks of the existing rainwater outlet pipe disconnection method. There is an urgent need for a buried rainwater outlet pipe disconnection method that can not only solve the problem of environmental aesthetics, but also reduce the kinetic energy of rainwater to avoid erosion of green plants.

[0010] This application is implemented as follows:

[0011] The present application provides a buried rainwater outlet pipe open ditch concealed disconnection structure, comprising a buried rainwater outlet pipe, an underground drainage ditch, an overflow rainwater outlet and a ditch bottom seepage drainage device, one end of the buried rainwater outlet pipe is connected to a rainwater riser, the other end of the buried rainwater outlet pipe is inserted into the underground drainage ditch, and the overflow rainwater outlet is arranged in a sunken green space;

[0012] The underground drainage ditch is arranged between the splash water and the sunken green space. A grate is set on the underground drainage ditch. A splash water is arranged above the ditch wall. One end of the splash water is connected to the outer wall of the building. Cement mortar is arranged on the inner side of the underground drainage ditch. The rainwater riser runs through the indoor floor.

[0013] In one embodiment of the present application, the underground open drainage ditch is grouted through the cement mortar, and the wall thickness of the ditch wall on one side that withstands the impact of water flow is 300-400 mm, and the wall thickness of the other side is 100-200 mm.

[0014] In one embodiment of the present application, the grate is made of a material with a relatively large dead weight, such as stainless steel, ductile iron or steel fiber concrete.

[0015] In one embodiment of the present application, the top of the underground drainage ditch is ≤ the lowest point elevation of the dispersion slope, the top of the underground drainage ditch is more than 30 mm higher than the top elevation of the overflow rainwater outlet, and the top elevation of the overflow rainwater outlet is 50-100 mm higher than the elevation of the sunken green surface.

[0016] In one embodiment of the present application, the ditch bottom seepage drainage device includes a seepage drainage pipe, a floor drain, a permeable geotextile and a seepage layer. A bottom plate is arranged under the underground drainage open ditch, the seepage layer is arranged under the bottom plate, a water receiving layer is arranged under the seepage layer, the floor drain and the seepage drainage pipe are arranged in the bottom plate, the floor drain is connected to one end of the seepage drainage pipe, the other end of the seepage drainage pipe extends into the seepage layer and the permeable geotextile is arranged at the port.

[0017] In one embodiment of the present application, the top surface elevation of the aquifer should be more than 300 mm higher than the groundwater level.

[0018] In one embodiment of the present application, the ditch bottom seepage drainage device includes a permeable geotextile, a permeable layer and a drain pipe. The permeable layer is arranged in the open underground drainage ditch, a bottom plate is arranged below the permeable layer, a cushion layer is arranged below the bottom plate, and the drain pipe is arranged at the bottom of the permeable layer. The drain pipe is close to the ditch bottom and penetrates the ditch wall to discharge rainwater. The permeable geotextile is arranged on one side of the drain pipe in the open underground drainage ditch.

[0019] In one embodiment of the present application, the bottom elevation of the buried rainwater outlet pipe is more than 50 mm higher than the top elevation of the seepage layer, and the height difference between the bottom elevation of the underground drainage ditch and the ground elevation of the sunken green space is controlled to be ≤1 m.

[0020] The beneficial effects of the present application are as follows: the present application obtains a buried rainwater outlet pipe open ditch concealed disconnection structure through the above-mentioned design. When in use, the buried rainwater outlet pipe is connected to the underground drainage ditch arranged next to the open scattered water. When it rains, except for a small amount of rainwater that will seep into the underground soil layer through the ditch bottom seepage drainage pipe and the ditch bottom seepage layer or slowly drain to the nearby small municipal rainwater pipe network through the seepage layer in the ditch and the ditch bottom drainage pipe, most of the rainfall overflows from the ditch top to the sunken green space and is discharged into the small municipal rainwater pipe network through the overflow rainwater outlet in the sunken green space. After the rain, the small amount of rainwater retained in the underground drainage open ditch can seep into the underground through the ditch bottom seepage drainage pipe and the ditch bottom seepage layer or pass through the ditch seepage layer along the drainage pipe laid along the ditch bottom and be discharged into the nearby small municipal rainwater pipe network at a staggered peak with the overflowing rainwater. The outflowing rainwater is blocked by the ditch wall of the underground drainage ditch and is forced to change its flow direction. In the process, some of the kinetic energy of the water is reduced. When the rainwater fills the underground drainage ditch longitudinally and then overflows evenly from the grate on the top of the ditch into the sunken green space, the rainwater flow rate is close to zero, and the scouring kinetic energy can be controlled and eliminated. The disconnection structure uses the method of overflowing from the top of the ditch through the peak rainfall into the overflow rainwater outlet, and a small amount of initial rain and retained rainwater after rain seeps into the drainage facilities at the bottom of the ditch for delayed and staggered drainage, thereby blocking the direct connection between the building rainwater outlet pipe and the outdoor small supporting rainwater network. On the premise of meeting the requirements of the sponge city design concept for the disconnection of the building rainwater outlet pipe, the underground concealed laying method of the rainwater outlet pipe is friendly to the landscape environment, and can also reduce the kinetic energy of rainwater and avoid scouring and damage to green vegetation. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the implementation methods of the present application, the drawings required for use in the implementation methods will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 It is a structural schematic diagram of a buried rainwater outlet pipe open ditch concealed connection structure provided by the first embodiment of the present application;

[0023] Figure 2 A structural schematic diagram of a buried rainwater outlet pipe open ditch concealed disconnection structure provided for implementation of the second application.

[0024] In the figure: 110 - rainwater riser; 120 - buried rainwater outlet pipe; 130 - underground drainage ditch; 140 - overflow rainwater outlet; 150 - sunken green space; 160 - ditch wall; 170 - grate; 180 - diffuser; 190 - building exterior wall; 191 - indoor floor; 192 - base plate; 193 - seepage drainage pipe; 1931 - floor drain; 1932 - permeable geotextile; 194 - seepage layer; 195 - drain pipe; 196 - cement mortar; 197 - receiving layer; 198 - cushion layer. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solutions and advantages of the implementation methods of this application clearer, the technical solutions in the implementation methods of this application will be clearly and completely described below in conjunction with the drawings in the implementation methods of this application. Obviously, the described implementation methods are part of the implementation methods of this application, not all of the implementation methods. Based on the implementation methods in this application, all other implementation methods obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0026] Embodiment 1

[0027] See also Figure 1 The present application provides a technical solution: a buried rainwater outlet pipe open ditch concealed disconnection structure, comprising a buried rainwater outlet pipe 120, an underground drainage ditch 130, an overflow rainwater outlet 140 and a ditch bottom seepage drainage device, one end of the buried rainwater outlet pipe 120 is connected to the rainwater riser 110, the other end of the buried rainwater outlet pipe 120 is inserted into the underground drainage ditch 130, and the overflow rainwater outlet 140 is arranged in the sunken green space 150;

[0028] The underground drainage ditch 130 is arranged between the water spill 180 and the sunken green space 150. A grate 170 is set on the underground drainage ditch 130. The grate 170 is made of a material with a large deadweight such as stainless steel, ductile iron or steel fiber concrete. The water spill 180 is arranged above the ditch wall 160. One end of the water spill 180 is connected to the building outer wall 190. Cement mortar 196 is arranged inside the underground drainage ditch 130.

[0029] The underground drainage ditch 130 is grouted with cement mortar 196, the wall thickness of the ditch wall on the side that withstands the impact of water flow is 300-400mm, and the wall thickness of the other side is 100-200mm, the rainwater riser 110 runs through the indoor floor 191, the top of the underground drainage ditch 130 is ≤ the lowest point elevation of the slope of the scattered water 180, the top of the underground drainage ditch 130 is more than 30mm higher than the top elevation of the overflow rainwater outlet 140, and the top elevation of the overflow rainwater outlet 140 is 50-100mm higher than the elevation of the sunken green space 150;

[0030] The ditch bottom seepage drainage device includes a seepage drainage pipe 193, a floor drain 1931, a permeable geotextile 1932 and a seepage layer 194. A bottom plate 192 is arranged under the underground drainage open ditch 130, a seepage layer 194 is arranged under the bottom plate 192, a receiving layer 197 is arranged under the seepage layer 194, a floor drain 1931 and a seepage drainage pipe 193 are arranged in the bottom plate 192, the floor drain 1931 is connected to one end of the seepage drainage pipe 193, the other end of the seepage drainage pipe 193 extends into the seepage layer 194 and a permeable geotextile 1932 is arranged at the port, and the top surface elevation of the receiving layer 197 should be more than 300 mm higher than the groundwater level.

[0031] Embodiment 2

[0032] See also Figure 2 The present application provides a technical solution: a buried rainwater outlet pipe open ditch concealed disconnection structure, comprising a buried rainwater outlet pipe 120, an underground drainage ditch 130, an overflow rainwater outlet 140 and a ditch bottom seepage drainage device, one end of the buried rainwater outlet pipe 120 is connected to the rainwater riser 110, the other end of the buried rainwater outlet pipe 120 is inserted into the underground drainage ditch 130, and the overflow rainwater outlet 140 is arranged in the sunken green space 150;

[0033] An underground drainage ditch 130 is arranged between the water splash 180 and the sunken green space 150. A grate 170 is arranged on the underground drainage ditch 130. A water splash 180 is arranged above the ditch wall 160. One end of the water splash 180 is connected to the building outer wall 190. Cement mortar 196 is arranged inside the underground drainage ditch 130. A rainwater riser 110 runs through the indoor floor 191.

[0034] The ditch bottom seepage drainage device includes a permeable geotextile 1932, a permeable layer 194 and a drain pipe 195. A permeable layer 194 is arranged in the underground drainage open ditch 130, a bottom plate 192 is arranged below the permeable layer 194, a cushion layer 198 is arranged below the bottom plate 192, a drain pipe 195 is arranged at the bottom of the permeable layer 194, the drain pipe 195 is close to the ditch bottom and penetrates the ditch wall 160 to discharge rainwater, a permeable geotextile 1932 is arranged on one side of the drain pipe 195 in the underground drainage open ditch 130, the bottom elevation of the buried rainwater outlet pipe 120 is more than 50mm higher than the top elevation of the permeable layer 194, and the height difference between the bottom elevation of the underground drainage open ditch 130 and the ground elevation of the sunken green space 150 is controlled to be ≤1m.

[0035] Specifically, the working principle of the underground rainwater household pipe open ditch concealed disconnection structure is as follows: when in use, the buried rainwater household pipe 120 is connected to the underground drainage ditch 130 arranged next to the open scattered water 180. When it rains, except for a small amount of rainwater that seeps into the underground soil layer through the ditch bottom seepage drainage pipe 193 and the ditch bottom seepage layer or slowly drains to the nearby small municipal rainwater pipe network through the seepage layer in the ditch and the ditch bottom drainage pipe 195, most of the rainfall overflows from the ditch top to the sunken green space 150, and is discharged into the small municipal rainwater pipe network through the overflow rainwater outlet 140 in the sunken green space 150. After the rain, the small amount of rainwater retained in the underground drainage ditch 130 seeps into the underground through the ditch bottom seepage drainage pipe and the ditch bottom seepage layer or passes through the seepage layer 194 and is discharged into the nearby small municipal rainwater pipe network at a staggered peak with the overflowing rainwater along the drainage pipe 195 laid along the ditch bottom. The flowing rainwater is blocked by the wall of the underground drainage ditch 130 and is forced to change its flow direction. In this process, part of the kinetic energy of the water is reduced. When the rainwater fills the underground drainage ditch 130 along the longitudinal direction and then overflows evenly from the ditch top grate 170 into the sunken green space 150, the rainwater flow rate is close to zero at this time, and the scouring kinetic energy can be controlled and eliminated. The disconnection structure adopts the method of overflowing from the ditch top to the overflow rainwater outlet 140 through the peak rainfall, and a small amount of initial rain and retained rainwater after rain seeps from the ditch bottom to the drainage facilities for delayed peak drainage, thereby blocking the direct connection between the buried rainwater outlet pipe 120 of the building and the small outdoor supporting rainwater pipe network. Under the premise of meeting the requirements of the sponge city design concept for the disconnection of the building rainwater outlet pipe, the underground concealed laying method of the rainwater outlet pipe is friendly to the landscape environment, and can also reduce the kinetic energy of rainwater and avoid scouring and damage to green vegetation.

[0036] The above description is only an embodiment of the present application and is not intended to limit the scope of protection of the present application. For those skilled in the art, the present application may have various changes and variations. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application should be included in the scope of protection of the present application. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

Claims

1. A buried rainwater outlet pipe open ditch concealed disconnection structure, characterized in that: The invention comprises a buried rainwater outlet pipe (120), an underground drainage ditch (130), an overflow rainwater outlet (140) and a ditch bottom seepage drainage device, wherein one end of the buried rainwater outlet pipe (120) is connected to a rainwater riser (110), the other end of the buried rainwater outlet pipe (120) is inserted into the underground drainage ditch (130), the overflow rainwater outlet (140) is arranged in a sunken green space (150), and the underground drainage ditch (130) is composed of a ditch wall (160); The underground drainage ditch (130) is arranged between the splash water (180) and the sunken green space (150); a grate (170) is arranged on the underground drainage ditch (130); a splash water (180) is arranged above the ditch wall (160); one end of the splash water (180) is connected to the building outer wall (190); cement mortar (196) is arranged on the inner side of the underground drainage ditch (130); and the rainwater riser (110) runs through the indoor floor (191).

2. The open ditch concealed disconnection structure of the buried rainwater outlet pipe according to claim 1 is characterized in that: The underground open drainage ditch (130) is grouted with the cement mortar (196), and the wall thickness of the ditch wall on one side that withstands the impact of water flow is 300-400 mm, and the wall thickness of the other side is 100-200 mm.

3. The open ditch concealed disconnection structure of the buried rainwater outlet pipe according to claim 2 is characterized in that: The grate (170) is made of a heavy material such as stainless steel, ductile iron or steel fiber concrete.

4. The open ditch concealed disconnection structure for buried rainwater outlet pipes according to claim 1 is characterized in that: The top of the underground drainage ditch (130) is less than or equal to the lowest point elevation of the slope of the water dispersion (180); the top of the underground drainage ditch (130) is more than 30 mm higher than the top elevation of the overflow rainwater outlet (140); and the top elevation of the overflow rainwater outlet (140) is 50-100 mm higher than the elevation of the sunken green space (150).

5. The open ditch concealed disconnection structure of the buried rainwater outlet pipe according to claim 1 is characterized in that: The ditch bottom seepage drainage device comprises a seepage drainage pipe (193), a floor drain (1931), a permeable geotextile (1932) and a permeable layer (194); a bottom plate (192) is arranged under the underground drainage open ditch (130); the permeable layer (194) is arranged under the bottom plate (192); a water receiving layer (197) is arranged under the permeable layer (194); the floor drain (1931) and the seepage drainage pipe (193) are arranged in the bottom plate (192); the floor drain (1931) is connected to one end of the seepage drainage pipe (193); the other end of the seepage drainage pipe (193) extends into the permeable layer (194) and the permeable geotextile (1932) is arranged at the port.

6. The open ditch concealed disconnection structure of the buried rainwater outlet pipe according to claim 5 is characterized in that: The top surface elevation of the aquifer (197) should be at least 300 mm higher than the groundwater level.

7. The open ditch concealed disconnection structure for buried rainwater outlet pipes according to claim 1 is characterized in that: The ditch bottom seepage drainage device comprises a permeable geotextile (1932), a permeable layer (194) and a drainage pipe (195); the permeable layer (194) is arranged in the underground drainage open ditch (130); a bottom plate (192) is arranged below the permeable layer (194); a cushion layer (198) is arranged below the bottom plate (192); the drainage pipe (195) is arranged at the bottom of the permeable layer (194); the drainage pipe (195) is close to the ditch bottom and penetrates the ditch wall (160) to discharge rainwater; the permeable geotextile (1932) is arranged on one side of the drainage pipe (195) in the ditch of the underground drainage open ditch (130).

8. The open ditch concealed disconnection structure of the buried rainwater outlet pipe according to claim 7 is characterized in that: The bottom elevation of the buried rainwater outlet pipe (120) is more than 50 mm higher than the top elevation of the water seepage layer (194), and the height difference between the bottom elevation of the underground drainage ditch (130) and the ground elevation of the sunken green space (150) is controlled to be ≤1 m.

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