(1) Underdeck: Refer to residential toilet 0 1SJ9 14 for the sinking drainage method of toilet. The concrete method is that the lower floor (part) of the toilet structure layer is 300mm as the pipeline laying space. Cast-in-situ concrete shall be used for the sinking floor, and waterproof layer shall be prepared. Water supply and drainage pipelines are laid along the lower layer according to the design elevation and slope, and filled with light materials such as cement cinder as cushion, and leveled with cement mortar as waterproof layer and protective layer. 0 1SJ9 14 atlas points out that a pipe fitting called "multifunctional patent floor drain" should be used in this way. The existing drip board usually refers to the first-class waterproof grade of the bathroom, which is lower than the blank grade of the living room. Distinguish by data: 350mm, 450mm, etc. 200mm floor, 350mm floor compared with the same period of last year. The clearance height of 450mm can be increased by 200mm~300mm, and the backfill is less by 200 mm ~ 300 mm. The backfill amount is small, which ensures the compactness and saves labor and materials. The comprehensive construction cost is low, and the plugging and maintenance are convenient. There is no need for suspended ceiling in the bathroom, which increases the overall clearance height and, more importantly, reduces the bearing capacity of the building.
(2) Wall row, introduced from Europe, commonly known as "tube well", is used for drainage of pipes in the wall. It refers to building a fake wall behind the sanitary ware in the bathroom to form a special space for arranging pipes with a certain width. The drainage branch pipe is laid and installed in the false wall, without crossing the floor, and connected with the main pipe at the same floor. The wall drainage method requires sanitary ware to choose hanging washbasin and rear drainage toilet, and supporting components: riser, branch pipe, concealed water tank and floor drain. This method meets the requirements of hygiene, beauty and neatness. Its disadvantages are: less sanitary ware selection, difficult floor drain setting, high cost and difficult pipeline maintenance. The key problem pointed out in GB500 15-2003 specification is that this wall drainage method at least does not conform to the national conditions of China. Secondly, its construction investment is large and there are many wall fittings, which can't solve the surface water in the bathroom. It is not worth popularizing.
(3) Cushion type: it refers to the way of raising the toilet floor. Because it is easy to produce "internal overflow", it is not used much. Occasionally used in the renovation of old houses when necessary. The construction of the new project is difficult, wasting manpower and material resources, affecting the appearance and increasing the bearing capacity of the building. It is no longer used.
The main components of the drainage system on the same floor are: main pipe, multi-way connector, branch pipe, toilet seat connector, multifunctional floor drain, multifunctional downstream tee, etc.