According to article 3.3. 13 of Code for Acceptance of Construction Quality of Building Water Supply, Drainage and Heating Engineering (GB50242-2002), metal or plastic sleeves should be provided for pipes passing through walls and floors. The top of the bushing installed on the floor should be 20 mm higher than the decorative floor.
Casing installed in bathroom and kitchen, the top should be 50mm higher than decorative floor, and the bottom should be flush with the bottom of floor; Both ends of the sleeve installed in the wall are flush with the finish.
It can be used according to the specification, but the sleeve of toilet riser is 50 times higher than the floor, which is easy to collide and has poor durability. Therefore, steel casing is generally used in the construction site.
Extended data:
Drainage pipe type
White iron pipe
Galvanized iron pipe is the most widely used material at present. Due to the high content of heavy metals in water caused by the corrosion of galvanized iron pipes, which affects human health, government departments in many developed countries and regions have begun to explicitly prohibit the use of galvanized iron pipes. At present, China is phasing out this type of pipeline.
brass
A traditional but expensive pipeline material is durable and convenient to construct. Among many imported bathroom products, copper tube is the first choice. Price is the main reason affecting its use, and copper corrosion is also a factor.
stainless steel tube
Stainless steel pipe is a durable pipe. However, its price is high, the construction technology is demanding, especially the material strength is hard, and the field processing is very difficult. Therefore, the probability of being selected in the decoration project is low.
Aluminum-plastic composite pipe
Aluminum-plastic composite pipe is a very popular pipe in the market. Because of its light weight, durability and convenient construction, its flexibility is more suitable for home decoration. Its main disadvantage is that when it is used as a hot water pipe, long-term thermal expansion and cold contraction will cause dislocation of the pipe wall and leakage.
stainless steel clad pipe
Stainless steel composite pipe and aluminum-plastic composite pipe are similar in structure and performance. Similarly, due to the strength of steel, the construction technology is still a problem.
polyvinyl chloride
PVC plastic pipe is a kind of modern synthetic material pipe.
However, scientific and technological research found that phthalein, a chemical additive that can soften PVC, has a great influence on the kidneys, liver and testicles in human body, which will lead to cancer and kidney damage, destroy the human functional reconstruction system and affect development. Generally speaking, because its strength is far from meeting the pressure requirements of water pipes, it is rarely used in tap water pipes. In most cases, PVC pipes are suitable for electric wires and sewage pipes.
Polypropylene pipe
PP (polypropylene) pipes are divided into several types, namely:
PP-B (block * * * polypropylene) is also commonly known as hot-melt pipe because of the melting technology adopted in the construction. Because of its non-toxicity, light weight, pressure resistance and corrosion resistance, it is becoming a popular material, but it is rarely used in decoration projects. Generally speaking, this material is not only suitable for cold water pipes, but also suitable for hot water pipes and even pure drinking water pipes.
The properties of PP-C (modified polypropylene) pipe are basically the same as above.
The properties of PP-R (random polypropylene) pipe are basically the same as above.
The physical characteristics of PP-C(B) and PP-R are basically similar, and the scope of application is basically the same, so they can be used interchangeably in engineering. The main difference is that the brittleness resistance of PP-C(B) material is better than that of PP-R; The high temperature resistance of PP-R material is better than that of PP-C(B).
In practical application, when the temperature of liquid medium is ≤5℃, PP-C(B) pipe is preferred; When the temperature of liquid medium is ≥65℃, PP-R tube is preferred; When the temperature of liquid medium is between 5℃ and 65℃, the properties of PP-C(B) and PP-R are basically the same.
HDPE plastic-steel winding pipe
Plastic-steel wound pipe is a new type of steel-plastic composite gravity gravity gravity pipeline product with independent innovation and intellectual property rights in Hua Han pipeline products. It is made of special-shaped steel-plastic composite tape by spiral winding welding (overlapping surface extrusion welding), and the inner wall is smooth and flat, with specifications DN 200-DN 2600 mm
This kind of pipeline has the advantages of corrosion resistance, light weight, simple installation, large flux and long service life (50 years). It can replace pipes made of high energy consumption materials (cement, cast iron, ceramics, etc.). ) belongs to environmental protection and green products.
Performance characteristics: Detailed description of serial number characteristics.
Safe and reliable ring stiffness Compared with pure plastic pipes, reinforced steel belts can easily make pipes, especially large-diameter pipes, have enough safe and reliable ring stiffness.
The inner wall of polyethylene (PE) pipe is smooth, and its flow resistance is 20 ~ 30% lower than that of cement pipe. The friction coefficient is small, the sediment is not easy to accumulate in the pipe, and the friction resistance is almost unchanged after long-term use.
Flexible or leak-free (electric fusion welding, butt welding) connection, good sealing performance and environmental protection performance. Both sealing connection methods can be operated manually with simple tools, without machinery, which is very simple and fast, reliable and leak-free.
Corrosion resistance, service life of more than 50 years. The service life of high density polyethylene (PE) pipes can be as long as 50 years.
Light weight, few joints, no need for large equipment, convenient installation and laying, light weight, no need for large lifting equipment during installation. Good axial flexibility, low requirements for flatness and firmness of groove bottom when laying, and strong ability to withstand abnormal stress caused by improper installation.
Baidu encyclopedia-drainage pipeline
Baidu Encyclopedia-Code for Acceptance of Construction Quality of Building Water Supply, Drainage and Heating Engineering