How to do the toilet reserved drain

First question: I don't know what you want to ask? There are very few bathrooms that still make caissons, and besides, the toilet drainage pipe generally uses only one riser.

2.This is a common practice, the general bathroom is suspended ceiling, and the horizontal sewage pipe is left at the bottom of the floor slab is also considered to be convenient for future maintenance, and nothing can be seen after the ceiling is suspended. There are very few practices for installing on floor slabs for one reason:

It will be buried in the ground, and it is inconvenient to repair it in the future; 2: The floor slab at the bathroom is much lower than other parts, at least 200 or more.

3.I don't know how the drawings are required, it stands to reason that as long as the location of the toilet (or floor drain) is determined, the drainage pipe should be able to be installed, because considering the waterproof construction requirements, of course, if it is clear that you only need to leave a tee, then you can leave it as required.

Communication: 1Now some developers have also considered the caisson floor drain, and the main bathroom is still sitting, so there is no need to lower the board, and the sewage riser of the toilet is originally a three, at most plus one ventilation;

2.If upstairs, generally the owners will decorate the kitchen and bathroom with a ceiling, which will cover up the ugliness and facilitate maintenance (the inspection port of squatting is downstairs); On the other hand, the whole system is at its own level, which seems to be the same layer of drainage, at least 400 to consider the plate, and the specific construction process is stricter than the previous one;

3.I haven't really thought about this, it should be realistic;

4.Not a master, just for communication.

Step 1: Reserve a large position at the sewer nozzle under the washbasin to avoid blocking it in the future, and then match the sewer pipe from the washbasin hole to each other. Then there is a waterproof tape to wrap around the interface repeatedly, and in the appearance, it is also necessary to pay attention to maintaining a horizontal position, and it is better to be able to apply some glue, so that the tightness of the seam can be guaranteed.

Step 2: Twist the remaining nut tightly with the rubber ring at the bottom of the washbasin, fix it again, and then put the entire washbasin porcelain plate on the top of the sink, place the position neatly, and ensure that the rubber ring and nut appear in the center of the entire washbasin, if it is uneven, it must be adjusted evenly. Because if there are some small problems in the future, you don't know how to repair them.

Step 3: Screw the nut to the bottom of the washbasin, that is, in the middle of the rubber ring and the porcelain plate panel, then put the other end of the sewer pipe under the floor drain, then check whether the washbasin is stable, and put a little water to observe whether there is water seeping out at the interface and whether the nut is fixed completely. Then check if there is any material missing in the whole process, finish it carefully, and make adjustments immediately if there are mistakes.

Precautions: When choosing the washbasin sewer pipe, the length should be reserved, about 20 cm, and it is best to choose PVC pipes when selecting materials, which are durable. And the waterproof tape must be used at the interface, because if the tape is waterproof, it will crack and leak again after a while.

This is too much to lose, time-consuming and laborious, and the last thing to pay attention to is to try to clean up the residue regularly when using.