Key points of drainage pipe construction

1. Toilet drainage pipe

A. Cascade drainage pipe: The diameter of the pipe changes from Φ 110 → Φ 75 → Φ 50 to form a height difference, preventing sewage from flowing back. However, it is best to use a pipe with a diameter of Φ 110 for the toilet drainage pipe, preferably closer to the main drainage pipe

It is also recommended to replace the shower floor drain with a larger diameter of Φ 75 instead of a Φ 50. If our shower area does not have a squat toilet to drain water, there will be a floor drain left for drainage. In the past, this shower floor drain usually used a drainage pipe with a diameter of Φ 50. However, in the later stage of daily use, when we shower, a large amount of water flows to the ground, and the drainage speed of the floor drain is much slower and larger than that of the showerhead, which will inevitably cause water accumulation at the floor drain. Therefore, if we can replace the 50 pipe with a 75 pipe, increase the drainage pipe diameter, and expand the drainage outlet, the problem of water accumulation may be well alleviated.

It is best for each tributary sewage pipe to have an independent water trap, so that the diversion of sewage not only does not affect the drainage speed, but also avoids the phenomena of odor, drainage retention, and floor drain overflow; If we want to prevent water from leaking downstairs, in addition to waterproofing, we can also take preventive measures such as hidden floor drain drainage. When water leaks into the waterproof layer, we manually drain the water to the location of the hidden floor drain, so that the leaked water can be drained away from the hidden floor drain instead of continuing to seep down through the backfill layer and downstairs; In the process of installing drainage pipes, in order to avoid sewage congestion and backflow, we can use fittings such as 45 ° elbows and 45 ° angled tees to arrange the drainage direction. Remember to avoid using 90 ° elbows as much as possible.

B. Ordinary drainage pipe: The diameter of the pipe is directly changed from a Φ 110 pipe to a Φ 50 pipe, and a 90 ° elbow and a straight tee are used. It will share the same water storage bend and other methods, without a 45 ° elbow and a 45 degree diagonal tee, or hidden leakage, which can easily cause water splashes when the sewage impacts and flows back into all surrounding pipes. Not all sewage will be directly discharged downstream. We often find problems such as odor and poor water flow in the bathroom, which may be caused by improper drainage pipe methods.

2. Construction method of balcony drainage pipe

A. Y-shaped approach: The balcony sinking height is not enough to do stepped drainage and water retention bends. In order to prevent backflow, it is recommended to increase the drainage pipe path when laying the balcony drainage pipe, instead of making a 90 ° right angle, and try to make inclined drainage to form a Y-shaped drainage shape.

B. Right angle method: Use the shortest and most material saving path to lay the drainage pipe, and use a 90 ° elbow. This method is especially suitable for balcony drainage with washing machines. If not handled properly, it is particularly prone to backflow in the later stage.

3. Kitchen drainage pipe: Find a way to use a floor drain, and try to use a drainage pipe with a diameter of Φ 75 for the vegetable pot due to long-term residue and leftover food.

4. Attention to construction details

A. All joints are constructed physically and connected with glue.

B. The area around the drainage pipe must be cleaned with a tissue or wet cloth before construction can begin.

C. After the drainage pipe is completed, especially at the submerged bend, it must be fixed with red bricks or cement.

D. Use red bricks for perimeter protection, and stone or ceramic tiles or other materials can be used for capping to achieve protection.

E. There are many ways to protect drainage pipes, such as cast-in-place non backfill protection, red brick+stone various protection methods;

There are also many backfill materials, some of which are locally sourced, cheap or even free, and can be directly backfilled with on-site construction slag. There are also options to use ceramic particles, carbon slag and other backfill methods.