CN-122013863-A - Roof rainwater drainage method for dispersion regulation, peak-staggering penetration and rainwater energy dissipation

CN122013863ACN 122013863 ACN122013863 ACN 122013863ACN-122013863-A

Abstract

The invention relates to a roof rainwater drainage method for dispersion regulation, peak-staggering penetration and rainwater energy dissipation. The method comprises the steps that roof rainwater enters the first well body through a building rainwater outlet pipe, firstly, the roof rainwater penetrates into surrounding soil through a perforated pipe connected with the first well body, a permeable layer is arranged around the perforated pipe to prevent the soil from entering the perforated pipe, when the soil is saturated, the liquid level in the first well body rises and overflows to the second well body through an overflow weir, then the roof rainwater penetrates into surrounding soil through the perforated pipe connected with the second well body, when the soil is saturated, the liquid level in the second well body rises, and finally, the roof rainwater is discharged to an external rainwater pipe network through a rainwater discharge pipe. The invention has the functions of dispersing and storing, peak-shifting and penetrating, and energy dissipation of rainwater, can also be used as an overflow well of a sponge facility, can automatically back flush a perforated pipe, is multifunctional, and can be effectively applied to various complex scenes such as high-rise buildings, old community reconstruction, sloping field buildings and the like.

Inventors

WENG JIANMIN
WANG YUMING
CHENG XIAO
WU CAIXIANG
CAI JINGWEI
SHEN JINGWEN
SHI ZENGLI
WANG LEI
Cai ang
ZHANG LINYU
LIU YANWEN
HAN LU
ZHANG YAN
WANG BIN

Assignees

浙江大学建筑设计研究院有限公司
中国建筑第八工程局有限公司上海分公司
江苏高能环保能源工程有限公司

Dates

Publication Date: 20260512
Application Date: 20260316

Claims (9)

1. A roof rainwater drainage method for dispersing, regulating and storing, peak staggering infiltration and rainwater energy dissipation is based on a roof rainwater drainage facility, the roof rainwater drainage facility comprises a well body (1) arranged below the ground and a rainwater drainage pipe (3) connected with the well body (1), the well body (1) is connected with an outlet of a building rainwater outlet pipe (2), the rainwater drainage pipe (3) is connected with an external rainwater pipe network, and is characterized by further comprising a backwash pipe (14) and at least two perforated pipes (4), one end of each perforated pipe (4) is opened, the other end of each perforated pipe is provided with a plug (42), the pipe wall of each perforated pipe (4) is provided with a plurality of water outlet holes (41), the well body (1) divides an internal space into a first well body (11) and a second well body (12) which are mutually independent through a vertical separation section (13), an overflow weir which can play a role is arranged at the top of the separation section (13), the overflow weir is arranged at the top of the first well body (11) and the second well body (12) and at the same distance from the first well body (4) to the second well body (4) which is arranged below the ground, the first perforated pipe (4) and the second well body (4) are arranged at the same distance from the first perforated pipe (4) and the second well body (12) which are at the same distance, the method comprises the steps of laying permeable layers (5) for preventing sediment from blocking water outlet holes (41) around perforated pipes (4), enabling rainwater discharge pipes (3) to be connected to the upper portion of a second well body (12), enabling elevation of the rainwater discharge pipes (3) to be 200-300 mm higher than that of a building rainwater outlet pipe (2), enabling the building rainwater outlet pipe (2) to be connected with a back flushing pipe (14), enabling the back flushing pipe (14) to be connected to each perforated pipe (4) through a branch pipe, enabling roof rainwater to enter the first well body (11) through the building rainwater outlet pipe (2), enabling the roof rainwater to permeate into surrounding soil through the perforated pipes (4) connected with the first well body (11), enabling the rainwater to be arranged around the perforated pipes (4) in order to prevent the soil from entering the perforated pipes (4), enabling liquid level in the first well body (11) to rise, enabling the rainwater to overflow to the second well body (12) through a weir, enabling the roof rainwater to flow into the second well body (12) through the overflow weir, enabling the roof rainwater to flow into the surrounding soil through the perforated pipes (12), and enabling the roof rainwater to flow into the surrounding soil to be saturated outside.
2. The roof rainwater drainage method for dispersing, regulating and storing, peak-staggering penetration and rainwater energy dissipation according to claim 1 is characterized in that the first inspection well of each building rainwater outlet pipe (2) of a building adopts the roof rainwater drainage facility, so that rainwater is dispersed, regulated and stored in each inspection well, and the volume of a concentrated regulation and storage buried water pool is reduced.
3. The roof rainwater drainage method for dispersing, regulating and storing, peak-staggering penetration and rainwater energy dissipation according to claim 1 is characterized in that a well cover with a sewage interception hanging basket (61) is arranged above the well body (1), and when the well cover is positioned at a concave green place, the well cover is changed into a concave green place overflow port (6) to serve as a concave green place drainage overflow well, so that the multifunctional integration is realized, and the concave green place overflow well is not required to be separately arranged.
4. The roof rainwater drainage method for dispersing, regulating and peak-staggering penetration and rainwater energy dissipation according to claim 1, wherein four groups of water outlets (41) are formed in the pipe wall of each perforated pipe (4) along the axial direction, the distance between two adjacent water outlets (41) in each group of water outlets (41) is 50mm, and the water outlets (41) on the two adjacent groups of water outlets (41) are arranged in a staggered mode.
5. The method for draining roof rainwater by dispersing, regulating, peak-shifting and energy dissipating according to claim 1, wherein the permeable layer (5) is made of pebbles and/or gravels.
6. The roof rainwater drainage method for dispersing, regulating and storing, peak-staggering penetration and rainwater energy dissipation according to claim 1 is characterized in that the number of the perforated pipes (4) is four, and two perforated pipes (4) are connected to the lower part of the first well body (11) and the lower part of the second well body (12).
7. The roof rainwater drainage method for dispersing, regulating and storing, peak-shifting, penetrating and rainwater energy dissipating according to claim 1, wherein the specification of the back flushing pipe (14) is DN50, and the back flushing pipe (14) is connected with a building rainwater outlet pipe (2) through a four-way joint.
8. The roof rainwater drainage method for dispersing, regulating and storing, peak-staggering penetration and rainwater energy dissipation according to claim 1, wherein in the period of heavy rain, part of roof rainwater is directly introduced into the perforated pipe (4) through the pipeline by the back flushing pipe (14), and the perforated pipe (4) is back flushed by using the roof rainwater with high flow and high impact force in the period of heavy rain, so that the automatic back flushing without power and manual intervention is realized.
9. The roof rainwater drainage method for dispersing, regulating, peak-shifting, penetrating and energy dissipating according to any one of claims 1-8 is characterized by being applied to high-rise buildings, old community reconstruction and sloping field buildings.

Description

Roof rainwater drainage method for dispersion regulation, peak-staggering penetration and rainwater energy dissipation Technical Field The invention relates to a roof rainwater drainage method with dispersion regulation, peak-staggering permeation and rainwater energy dissipation, which is mainly used for collecting roof rainwater and belongs to a multifunctional drainage method with the functions of dispersion regulation, peak-staggering permeation, rainwater energy dissipation and overflow well serving as a sponge facility. Background In 2014 of China, the concept of a sponge city is formally proposed, and the sponge city is a city development mode which fully plays roles of absorbing, storing and releasing rainwater by ecological systems such as buildings, roads, greenbelts, water systems and the like through strengthening city planning construction management, effectively controls rainwater runoff and realizes natural accumulation, natural permeation and natural purification. Sponge city is an effective measure for controlling runoff coefficient from source, relieving urban waterlogging, reducing urban runoff pollution load, saving water resource, protecting and improving urban ecological environment. Low Impact Development (LID), the core of which is to maintain the hydrologic characteristics before and after site development, including total runoff, peak flow, peak time, etc. From the hydrologic cycle perspective, the method adopts modes such as permeation and storage to realize that a certain amount of runoff is not discharged after development if the total runoff amount is kept unchanged, and adopts measures such as permeation, storage and adjustment to cut down the peak value and delay the peak value time if the peak value flow is kept unchanged. In order to meet the requirement of low-impact development, the conventional control indexes in the design process are annual runoff total control rate, comprehensive runoff coefficient and non-point source pollution reduction rate (calculated by SS). The technical measures for realizing the control indexes comprise adopting a concave green land, a rainwater regulation and storage pool, a biological detention belt, roof rainwater, water-permeable pavement, roof greening and other technical measures. In conclusion, the core of the arrangement of the sponge city is that a certain amount of runoffs are not discharged outwards in a permeation and storage mode, and the peak runoff amount is reduced. Aiming at civil construction projects, the problems that rainwater potential energy is high, sponge facilities cannot be directly entered, a large amount of roof rainwater is directly discharged and the like exist in high-rise construction projects, the problems that outdoor sites are compact, underground pipelines are complex, green land areas are small, excavation construction difficulty is high and the like exist in old community transformation projects, and the problems that concave green lands cannot be arranged on sloping fields, rainwater storage tanks cannot be excavated on slopes, rainwater is not timely in retention time under a pad surface and the like exist in slope construction. The conventional method for roof rainwater drainage comprises the steps of enabling roof rainwater to enter sponge facilities such as a concave green land in a disconnected mode or directly drain into a rainwater pipe network, arranging a concentrated rainwater storage pool at the tail end of the rainwater pipe network, penetrating by adopting green land, permeable pavement and the like, and storing in the concave green land and the concentrated rainwater storage pool. Green land, permeable pavement and the like are all rainwater surface penetration, and the problems of difficult roof rainwater receiving, short residence time and incapability of peak-staggering penetration exist in the adoption of surface penetration. The concave greenbelt is a rainwater surface regulation and storage means, the concave greenbelt is provided with requirements for landscape plant selection, greenbelt area and aesthetic factors, the centralized regulation and storage water tank is a rainwater underground regulation and storage means, the centralized regulation and storage water tank is arranged at the tail end of a rainwater pipe network, deep burial, large in excavation area and high in early investment cost, after water is fully stored, power equipment is required to be used for emptying, the regulation and storage effect can be achieved in the next rainy place in time, and the later manpower maintenance cost is high. The method has the problems that when the building is a high-rise roof, rainwater impact is large, rainwater cannot directly enter sponge facilities such as a concave green land and the like, so that the high-rise roof rainwater can only pass through an energy dissipation well and then enter a centralized storage pond through a rainwater pipe network below earthing, when an old com