According to the construction experience, in the actual installation engineering, the type A and W type two kinds of pipe collocation is used the effect is good, it can not only meet the construction quality, use function that need, and can save materials, reduce the cost. Generally the mains, first emerge drainage and tube appropriate USES type A tube, drainage stand pipe and drainage pipe appropriate USES W type pipe. Such collocation is used advantage is: type A pipe flanges gland connection due to mechanical performance is better, doing the mains drainage, can ensure service life and to use A function. At the same time, because of its good mechanical strength, especially suitable for high-rise drainage the house traverse pipe, can withstand the upper of coming water from the impact. W type pipe due to fast installation, the interface can be flexible good music, appropriate do drainage stand pipe selection of materials, especially as a lavatory bath drainage between the pipe installation construction, can use its interface can be good music and close the flexible, the drainage of the good control of the slope. And because the W type pipe fittings of properties, with housing project completion of decorate now present situation (usually is the lavatory bath drainage stand between GuanMing dew), in the stand pipe hidden when decorating, decorate to decorate, can save space, increase the actual usable floor area. In addition, will be A type and W type two kinds of pipe collocation is used, in addition to the above the reason, but also because the type A pipe installation construction process the rest of the material can produce short as the ground drainage pipe installation of the use, save material, has the good economic efficiency. Combination of the two pipes at home and abroad and the use of, the author, based on his experience in the use of the construction of the point, focuses on the construction of the installation of the W type, do some simple introduction. W type of stainless steel tube is used to connect the hoop connects a card construction. Stainless steel card hoop pieces from the rubber lining, card hoop, rolling shaft and bolt constitute perforation. Interface with rubber seal, the effect is good, can withstand the shock from the direction (including strong earthquake). Cover for stainless steel card hoop, interface and firm, corrosion resistance. In the installation interface will relax the biggest diameter hoop card to the limit, the first coat set of stainless steel pipe into, and then at both ends of the interface between the rubber set inside, will be set in the rubber set of stainless steel coat external screw tightly a satisfactory result. W type pipe connection mode determine the installation, maintenance convenient features, but, because use bolts extrusion of rubber seal connections connection, seal degree with the materials themselves have relations in addition, the main depends on the degree of fastening bolts. According to the author of the construction experience, tighten bolts, had better use by manufacturers provide special tools (on the market at present), so that can ensure tighten effect and can improve the work efficiency. In addition, when drainage clogging, only need the card hoop thing can be removed, is simple, and this is the traditional pipe that no other advantages. In order to ensure construction quality and use function, prevent to run, run, dripping, such as leakage phenomenon to appear, in practical projects, in addition to regular out water the ball outside test, the author also adopted the full of water test and tap on the way of combination of sounds. For every time the materials into full water test selective examination, all qualified rear can enter the arena, specific when using, tap materials, such as sound light clear, the qualified, once a buzzing sound, said it has burst. Next in the pipeline construction after every day, to the temporary sealing mouth, prevent debris falling after into the pipeline. In between each toilet bath after installation is complete, were in drainage tubes do full of water test, the main check whether interface is leaking, have handle problems in time.