1、建筑设备给排水（1. Water supply and drainage of construction equipment）.doc

1、建筑设备给排水（1. Water supply and drainage of construction equipment） 1. Type of water source 1. Ground water A. Clean water; B. Water temperature stability; C. Easy to use; D. Small amount of water and limited reserves; E. Not renewable in the short term, if overexploitation can cause the ground to sink. 2. Ground water A. large amount of water; B. Renewable, not easy to cause environmental problems; C. Poor water quality; D. Temperature changes with the seasons; E. 3. Water source selection Water quality, water and water conservation should be ensured. 2. Water intake engineering Groundwater intake structure 1) pipe well: deep water level and deep water pump 2) large well: shallow groundwater (within 30 meters) 3) seepage: the water of the river, the water of the reservoir or the shore, the laying pipe network collects the underground water seepage, buried 3 ~ 5 meters deep 2. Surface water intake structure 1) fixed water structure. Its a permanent water intake facility Large amount of water, reliable water intake and convenient maintenance Large investment and complex engineering The water level changes little ground water 2. Movable intake structure The water level fluctuate greatly and the amount of water is relatively small Small investment, fast construction, strong adaptability 3. Purification process 1) coagulation: mixed flocculation, some dosing coagulant to water (alum, ferrous sulfate, etc.), through its hydrolysis product with small particles in water, adsorb, granulated, again through flocculation flocculant to form large grains, which facilitates precipitation; 2) precipitation: the process of separating suspended objects from the water by gravity. In practice, the sediment pool is used for this process; 3) filtering: Precipitate after water through the filter of quartz sand layer, the use of sand grain tiny pore sieve effect such as filtration, adsorption intercept the water suspension miscellaneous quality, thus make the water clear, but the water stil