Design method and design system for roof rainwater drainage systems and drainage system

Abstract

The invention provides a design method for roof rainwater drainage systems, which comprises the following steps of: calculating the volumetric flow rate of water flowing through a rainwater hopper; calculating the mass flow rate of an aerified water flow; calculating the pressure loss of each pipeline section based on the mass flow rate of the aerified water flow; calculating the values of negative pressures on a hanged pipe and a stand pipe at the junction point of the tail end of the hanged pipe and the top end of the stand pipe; judging whether the values of negative pressures on the hanged pipe and the stand pipe at the junction point satisfy the design requirements of a pipe system or not, if so, completing the design process; and otherwise, designing the value of each pipe diameter again, and then calculating again. Therefore, in the drainage system designed according to the design method for roof rainwater drainage systems provided by the invention, the pipes of the drainage system are thin and short in length, so that the application quantity and construction quantity of the pipes can be reduced, thereby reducing the cost of the whole drainage system. Meanwhile, the drainage system is additionally provided with an exhaust device, therefore, the hidden troubles such as roof rainwater ponding and leakage as well as manhole sweating can be avoided.

Description

technical field [0001] The invention belongs to the field of water supply and drainage for buildings, and in particular relates to a design method and design system for a roof rainwater drainage system, and a drainage system designed according to the design method or design system. Background technique [0002] With the global energy crisis and the rise of raw material prices, the cost of buildings is getting higher and higher. Therefore, architectural design units are required to minimize the consumption of building materials to reduce construction costs. [0003] The roof rainwater drainage system is an indispensable part of the overall design of the building. It is used to drain the rainwater on the roof of the building in time to avoid accidents such as roof leakage caused by accumulated water on the roof. In practical application, the length and diameter of the pipes in the roof rainwater drainage system are one of the important factors affecting the construction cost o...

AI Technical Summary

Problems solved by technology

Therefore, in the design of roof drainage system based on one-phase flow of water, when two-phase flow occurs, due to the aeration of water flow, the gas will occupy part of the cross-section of the suspension pipe, standpipe and buried rainwater pipe, resulting in drainage If it is not smooth, it is easy to cause roof water and / or buried pipe inspection well water accidents

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