屋面排水（Roof drainage）.docVIP

屋面排水（Roof drainage） Roof drainage (two) roof drainage; Roof drainage is divided into two categories: unorganized drainage and organized drainage. 1. unorganized drainage No organization drainage also called free water, roof rainwater means free from falling to the ground outside the cornice. Medium and small buildings of 3 or less than 3 or with eaves height less than or equal to 10m can use unorganized drainage. No organization drainage cornice size should not be less than 0.6m. 2. organized drainage Organized drainage is carried out through drainage systems that organize the area of the water from the ground to the ground. That the roof is divided into several drainage area, the rain gutter organized into, after the row to the water outfall bucket, the downspout is discharged to the outside, finally discharged to the city underground drainage system. Organized drainage can be divided into two forms: internal drainage and external drainage. Within the drainage carried an indoor complex structure, easy leakage, inconvenient maintenance, commonly used in the roof area of large multi-storey buildings and high-rise building roof, the general multi-storey building should be as far as possible the use of organized drainage way. Organized drainage is widely used in multi-storey and high-rise buildings, high standards, low rise buildings, street buildings and buildings in cold areas should also be organized drainage. The organized drainage way, should make the roof water line short, gutter or gutter water inlet load unobstructed, proper and uniform arrangement. The number of roof carried, should according to the current building water supply and drainage design standard GB 50015-2003 regulations, through the drainage amount and each downspout downspout catchment area calculation. The following requirements for the drainage system: (1) each roofing or gutter, generally not less than two water outlet. (2) the spacing between the two rain gates should not be greater than the