What is the specific content of the rainwater external drainage system? Zhongda Consulting will answer it for you below.
1. Gutter external drainage system
Also known as downpipe drainage system or ordinary external drainage system, it consists of gutter, rainwater bucket and downpipe (standpipe). Rainwater is mostly collected through roof gutters, and then flows into downpipes set at certain intervals along the exterior wall for discharge to underground ditches or the ground. It is suitable for the elimination of rain on the roofs of general residential buildings, public buildings with small roof areas, small single-span factories and other buildings.
The spacing of downspouts should be determined based on the intensity of local rainstorms, the roof water catchment area and the water flow capacity of the downspouts. According to experience, a DN100 downpipe is generally installed at 15~20m, and its catchment area does not exceed 250㎡. The downpipe on the balcony can be DN50.
2. Gutter external drainage system
p>External gutter drainage uses the capacity and slope of the gutter itself formed on the roof structure to discharge rain and snow water to both ends of the building (in the direction of the gable and parapet), and then drains it through the risers outside the wall. to the ground or stormwater pipes. It consists of gutters, rainwater buckets, drainage risers and discharge pipes. It is suitable for multi-span industrial factories with a length not exceeding 100m, and buildings where rainwater pipes are not allowed to be arranged in the factory.
In engineering practice, gutter drainage is often used to remove rain and snow water from large roofs. Using gutter drainage can not only eliminate the problem of water leaking from inspection wells in the kitchen, but also save investment and metal. The materials and construction are simple, which is conducive to the rational use of factory space and ground, as well as the advantages of providing open ditch drainage for the factory rainwater system or reducing the buried depth of pipes; however, if the design is poor or the construction quality is poor, problems such as gutter flooding and water leakage will occur.
For drainage outside the gutter, the expansion joints or settlement joints of the building should be used as the roof watershed. The length of the gutter should be arranged in conjunction with the expansion joints of the gutter. Generally, it should not be greater than 50m, and its slope should not be less than 0.003. To prevent water from accumulating at the end of the gutter, an overflow outlet should be installed on the parapet, gable wall or end of the gutter. , the overflow opening is 50~100mm lower than the upper eaves of the gutter.
When the vertical pipe drains directly to the ground, anti-scouring measures need to be taken. In areas with collapsible soil, direct drainage is not allowed, and in frozen areas The risers need to be protected against freezing.
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