Why is the second floor easy to backwater, and what kind of second floor is not backwater

Summary. The second floor of the new community generally does not backwater. Because the current high-rise buildings have negative one floor and negative two floors as garages, the first and second floors are the same as the other floors above, and there is no independent drainage.

The second floor of the new community generally does not backwater. Because the current high-rise has a negative floor and a negative second floor, such as a floor and so on, the first floor and the second floor are the same as the other buildings above, and there is no independent drainage. Contains an eye.

This is because in the current water supply and drainage design, in order to avoid the backlash of the first layer caused by the blockage of the pipeline, the drainage of more than two floors is separated from the drainage of the first floor. However, even if the second floor or above is uniformly drained, the drainage pipe must be led underground before it is discharged. Unless the main drain is blocked, there is a chance that water will overflow from the second floor.

However, the odds are very low. If the first floor is also a residence, the location of the water pipes should be up and down, and it is not easy to block them without turning the corner.

However, if the first floor is a commercial outlet, this is not necessarily the case. From the point of view of drainage alone, it is very likely that the ulnar limb brother of the water pipeline is not in a way to deal with it because of the different functions of use, and it needs to be turned, so there will be a hidden danger of blockage. However, at present, the drainage pipes used by the hunger wheel are relatively smooth inner walls, and the probability of clogging is not large.

Backwater is not a common phenomenon, and the second floor of high-rise residential buildings generally does not backwater. The situation of backwater on the second floor mostly occurs in old-fashioned houses, and the sewer bend is normally on the second floor, so the possibility of backwater and blockage is high; However, after 1997, there is no independent drainage in the building, and the laying method of the sewers has been changed to a buried type, and the bends are all underground, so there is no problem of anti-water on the second floor.

Generally, the reasons for sewer backlash are as follows:

1. There is a blockage.

It is very likely that there is a blockage under the main sewage pipe, and once the sewage is not discharged, the sewage will flow back to the outlet closest to the blockage point, and there is no way to deal with this situation by itself, so you can only dredge the pipe.

2. The main pipeline is blocked.

The main pipeline blockage is the blockage of the main sewer from the first to the seventh floor, and the blockage location is generally at the position of 90 degrees below the sewer manhole cover to the bottom of the first floor.

3. Pipe problem.

In the past, the drainage pipes of residential buildings were generally sand mold cast iron pipes, with rough inner walls, easy to hang dirt, and easy to rust if the anti-corrosion was not done well, resulting in poor drainage. The plastic drainage pipe and the mechanism centrifugal cast iron pipe have a smooth inner wall, and the dirt is not easy to be deposited and cause blockage, and the water flow capacity is 10% 26% larger than that of the sand mold drainage cast iron pipe.

Hello, the second floor sewer is not anti-water, is a probability problem, the same house type, community, property, different buildings may have different results, so we can only analyze whether there is a possibility of anti-water from the probability, from several factors that have a greater impact, I divided into three categories to score, everyone is seated on their own: first, according to the room type analysis 1, multi-storey on the second floor of the multi-storey is our most common step room, generally the total height of 6-7 floors without elevator, fortunately, the general sewer outlet on the first floor, And there are only 4-5 neighbors upstairs, and the probability of blockage and backwater on the second floor is very low. (Risk probability 1 point) 2, the second floor of the elevator house is 4-8 floors high, there are elevators, according to the new regulations, most of the first floor is their own sewer pipe, the second floor is the sewer pipe outlet end, there is also the first floor is the end of the exit, this will be different according to the design of different developers.

Generally, the elevator house is large, double bathroom, two-pronged sharing of the frequency of use of sewer, upstairs neighbors only 2-6 households, the probability of blockage is also minimal. (Risk chance 1 point) 3. The most common building on the second floor of a small high-rise building is mostly 11-18 floors, with an elevator, which is generally the end exit of the second floor and an independent launch on the first floor. In this case, the probability of the second floor of the sewer blockage is much greater than that of multi-storey and western-style houses, and the upstairs neighbors are in 9-16 households, due to the large number of users, the probability of blockage will be greatly increased.

Risk probability 2 points) 4, the second floor of the high-rise risk is mostly 33-34 floors, there is an elevator, generally the end of the second floor exit, 31-32 households upstairs, the second floor of this situation is the above types of room blockage and water probability is the highest. (Risk probability 3 points) According to the age of the house analysis of the house before the year, the age of the house is more than 20 years, it belongs to the old house, the pipeline is aging, and most of the cast iron sewer pipes are used, the pipe wall is not only rough and rusty, the dirt is easy to hang on the wall, and some of them also use old-fashioned squatting, compared with the toilet, the disadvantage is that it is very easy to flush some sundries into the pipe to cause blockage, which is difficult to dredge, so the risk probability of taking squatting and cast iron sewer pipes is the highest. (Risk probability 3 points after the house, the age of the house is relatively new, basically all are modern communities, the use of new building technology, the standard of the house, the basic use of PVC sewer pipe, the pipe wall is smooth and not easy to hang dirt, and the pipe is more reasonable, the basic family has a backwater bend in the drainage position, even if there is a blockage falling in, it will be found in time to be blocked at the backwater bend position, and it is not easy to fall into the main pipeline; (Risk probability 1 point) 3. According to the property analysis 1, most of the non-property communities are old communities, relocation, dormitories, etc., due to the lack of property management, the basic total sewage pipeline is cleaned by the municipal government can not guarantee that it will be cleaned and inspected on time, and the probability of blockage of the main line will increase significantly.

Risk probability 3 points) 2, the general property community here refers to the general property refers to the quality of service, some small property inaction, will also increase the risk of blockage and backwater, but under the supervision of the owner, some problems will be solved, compared with the property community will have some protection.

Teacher, is it the same as drainage?

Hello, basically the same.

1. Because the first floor of many residences is an independent pipe, and after arriving on the second floor, the public drainage pipe is used, and almost all the water will be collected on the second floor, if there is a leakage in the pipeline on the second floor, it will cause the problem of backwater on the second floor.

2. According to the design of the pipeline, the pipeline on the second floor is easy to be blocked, once the blockage in the pipeline becomes more and more serious, and the drainage is not timely, the water will return directly to the second floor.

3. Because the drainage principle of the drainage pipe is to drain water by gravity, it first needs to be discharged to an independent pipe, and then through a public pipeline. When the water flow speed is not up to the required level, it is easy to cause blockage.

If the drain pipe is clogged, there will be a problem of backwater in the drain.

There are two main cases:

1. In the process of daily use, the pipe is blocked due to the discarding of items and wastes into the main sewer pipe (drainage pipe), and the daily life wastewater of the upstairs neighbors flows into the blocked main sewer pipe, and the problem of backwater will occur.

2. When the upstairs neighbors concentrate on discharging wastewater into the sewer pipe, the air in the pipe will be compressed, so as to produce pressure on the water supply in the trap connecting the main sewer pipe on the lower floor, resulting in backwater.

Substrate flooding: Substrate flooding is the continuation of the roofing membrane, which is laid on the surface alone. Base flashing is usually made with non-metallic materials, such as plastic or asphalt-impregnated products.

The combination of non-metallic and metallic materials in the base flashing can make each of them perform their best effects.

Cap flashing: Cap flashing is made of metal, plastic, or impregnated linoleum and is mainly used to seal or protect the edge exposure of the base layer of flooding.

Flooding is the waterproof treatment at the junction of the waterproof layer and the vertical wall, such as high and low spans, parapets, chimneys, skylight walls, etc. In order to prevent the linoleum from breaking at the right-angle turn, the waterproof layer and the vertical plane should be scraped into an arc or 45° inclined plane with mortar or concrete, and the linoleum should be pasted vertically along the arc surface.

The reasons for the backlash on the second floor are as follows:

1. The new houses on the first floor are usually independent water pipes, and the main pipes of the common drainage pipe are generally used on the second floor, so the water discharged will be collected on the second floor, and the things discharged from the sewers on other floors will also be blocked to the second floor, thus forming a backwater situation.

2. If there is a blockage in the pipeline, it will directly lead to the blockage of the drainage pipe and the sewage will be reversed to the nearest outlet.

3. Usually before designing a house, you must consider this problem, and at the connection between the drainage riser and the horizontal pipe, you must use two 45° or bending radii.

It can not be less than 4 times the elbow of 90 °, and the drainage pipe should be designed as much as possible to make a straight line, the pipe bending and the slow water flow speed is very easy to blockage and reverse the water situation, you can properly relax the diameter of the drainage pipe is also a very good way to drain.

4. Another is to prevent the backwater situation caused by the settlement of the house, when designing the drainage pipe foundation, the top of the pipe must reserve enough settlement, usually this requirement can not be less than 150 mm, and at the same time increase the slope of the drainage pipe, but not greater than 15 °, otherwise it will directly affect the service life of the pipeline, so it must be planned before designing the pipeline, so as not to bring unnecessary trouble in the future.

5. Residential drainage is generally gravity self-flowing drainage, and the sewage is discharged into the drainage riser by the sanitary appliances of the residence, then into the drainage horizontal trunk pipe, and finally into the outdoor drainage inspection well.