Primary and secondary drainage
Generally speaking, the first drainage is by the floor drain attached to the brick surface, and the second drainage is to make a secondary drain at the bottom of the caisson. When the toilet leaks into the caisson, the secondary drain drains the caisson water, and the toilet is kept clean.
Second, the secondary drainage construction method
1. Dark leakage
When leveling the caisson for the second time, find the lowest point as a dark drain, and then brush waterproof and filling. (Note: It is necessary to protect the drain with something next to the secondary drain to avoid blockage of the drain when backfilling.)
Dark drain (ceramic backfill process) construction drawing
The following is a real view of the two pipe layouts of the dark drain
2. Open holes in the sewage pipe
After cleaning, leveling and waterproofing at the bottom of the caisson, a small hole is made at the root of the sewage pipe, and anti-blocking measures are made outside the small hole. (Note: The bottom leveling of the caisson needs to be sloped according to the root of the sewage pipe as the lowest point, so that the stagnant water will collect to the root of the sewage pipe and discharge through the small hole in the root.)
Sewage pipe opening (brick overhead layer process) construction drawing
The following is a real view of the layout of the sewage pipe opening pipe
The above is the principle and construction of secondary drainage in residential toilets, and the toilets should be combined with waterproofing and drainage to jointly prevent caisson infiltration.