建筑给排水设计与施工中常见质量问题及防治（Common quality problems and prevention in design and construction of building water supply and drainage）.doc

建筑给排水设计与施工中常见质量问题及防治（Common quality problems and prevention in design and construction of building water supply and drainage） Common quality problems and prevention in design and construction of building water supply and drainage 1 、 pipe pressure test and flushing problem (1) confusion strength test and tightness test. The strength test pressure is higher than the work pressure, the time is short; the tightness test pressure is equal to the work pressure, the time is long, cannot substitute for each other. (2) test pressure and drain water instead of pipeline flushing. Tap water or water pumped by the pump will be used to flush the pipe. Otherwise, the rubbish in the pipe can not be washed away, the water quality will be polluted, and the tightness of the valve will be affected. (3) there is air in the test tube, which makes the reading of pressure meter unstable. The relief valve shall be installed at the top of the system. (4) the district control valve is used as the isolation measure of the section pressure test, and the test pressure is often failed because of the leakage of the valve. Application of blocking plate or plug as a temporary isolation. (5) the partial shut off valve is deliberately closed when the whole pipeline is under pressure test, which results in short test pressure pipe and qualified capacity, but the integrity of the test is lost. Supervisors should carefully check and mark to prevent fraud. (6) the pressure gauge is not qualified. The supervisor shall check that the pressure gauge can be reset to zero. It is better to install two qualified pressure gauges for comparison purposes. 2 、 quality problems of septic tanks, inspection wells and outdoor drainage pipes Septic tanks, inspection wells and outdoor drainage pipes and other engineering content, belong to the construction of water supply and drainage design category, but by the construction of professional civil engineering, water professionals often ignore inspection and lead to qualit