How to solve the problem of kitchen reflux

First, the cause of the kitchen sewer anti-water

1. Pipeline materials

The traditional cast iron pipe is rough and easy to age and rust, which leads to dirt deposition. Therefore, it is recommended to use plastic drainage pipes and centrifugal cast iron pipes when building new houses or replacing pipelines. Compared with the drainage cast iron pipe, it has the advantages of smooth inner wall, less accumulation of dirt and greater water permeability.

2. Hydraulic conditions

The common residential drainage is gravity gravity drainage. Domestic sewage first flows into the drainage riser through sanitary equipment, then into the horizontal drainage pipe, and finally into the outdoor drainage inspection well. When the sewage flows to the bottom of the drainage riser and is about to be transferred to the drainage riser, it will be blocked instantly and form a positive pressure water column at the bottom of the drainage riser in a short time. At this time, if the hydraulic conditions are not good, such as the drainage riser and the horizontal drainage pipe are not connected with two 45-degree elbows, the horizontal drainage pipe has a small diameter, a small slope, or is blocked, these conditions will lead to the formation of a higher positive pressure water column. Finally, if the positive pressure water column is higher than the kitchen sanitary ware, the sewage will overflow and pour water.

3. Housing placement

Generally speaking, due to its own weight and foundation, coupled with a low degree of attention to construction, it will cause excessive settlement of the house, and pressure will lead to drainage and drainage pipes. In this way, the slope of the drainage outlet pipeline gradually slows down, or even goes against the slope. In severe cases, the drainage outlet pipe is damaged, which leads to poor drainage, so the kitchen sewer reverses.

Step 4 floor

Usually the first floor is a separate sewer, and the water pressure is very low, so it is not easy to block. However, pipelines are mostly used on the second floor and above, and the plugging position is generally at the 90-degree corner from the manhole cover to the first floor, so the sewage backwater is mostly on the second floor.

What should I do if the kitchen sewer goes against the current?

1. Solution: First of all, all unfavorable factors should be considered when designing a house. The layout of drainage pipes should meet the best hydraulic conditions. Therefore, special attention should be paid to the connection between drainage riser and horizontal drainage pipe. It is recommended to use two 45 bends or elbows with bending radius not less than 4 times the pipe diameter. The connection of the drain pipe should be as straight as possible, with little rotation, and the diameter and slope of the drain pipe should be appropriately increased.

2. Pipeline problems In the past, the drainage pipes of houses were generally sand cast iron pipes. The inner wall is rough and easy to hang dirty. Corrosion protection is not easy to rust, resulting in poor drainage. The inner walls of plastic drainage pipes and mechanical centrifugal cast iron pipes are smooth, and dirt is not easy to accumulate, resulting in blockage.

3. Solution to the pipeline problem: For the completed house, if the backwater problem of the bottom house is very serious because of the pipeline problem, then the original drainage pipeline needs to be reformed. At this time, plastic drainage pipes or mechanical centrifugal cast iron pipes should be adopted.

4. The slope of the main settlement and drainage pipes of large houses generally meets the standard slope during construction. The sewage flow in the pipeline can reach the self-cleaning flow. Houses are normal because of their own weight and foundation settlement, but they have not been paid good attention to in the design and construction process, and corresponding measures have not been taken, resulting in a large number of houses being demolished. The drainage of houses and households is squeezed, resulting in drainage. Even if the slope is reversed, the slope of domestic pipelines will decrease. In severe cases, it will crush the drainage pipe, resulting in poor drainage.