South Asia PVC tube It is a plastic product, its rigidity is far less than that of cast iron pipe, and its expansion coefficient is large, so the support must be reasonably selected, The Conduit The larger support spacing is shown in the table below, instead of the 1500mm required for cast iron pipes, the larger support spacing for each layer of the riser should be firmly fixed Bracket The fixed support can not only control the expansion direction of the pipeline, but also share the dead weight of the riser. It can also prevent the pipe head connecting the riser and the outgoing horizontal pipe from being pressed too much, causing the pipeline to break and leak. At the same time, the bottom of the riser should also be provided with buttresses or hangers and other fixing measures.
1. Problems in engineering installation
The installation of PVC pipes in South Asia is a new process, and the installation personnel do not understand the process requirements, which leads to insufficient glue coating at the interface and missed coating, pipe fitting Improper use position, etc.
The correct construction process is: Pipe The fracture shall be flat and level, and the burrs inside and outside the fracture shall be removed with a round file or scraper. Before bonding, the socket and spigot shall be inserted into the test, and shall not be completely inserted, generally 3/4 - of the socket, and shall be marked. After the test insertion is qualified, wipe the moisture and dust around the socket with cotton wire. Apply adhesive tape with a brush, first coat the socket, then coat the socket, and apply it axially. The action should be rapid and evenly. The amount of adhesive tape should be appropriate, and it should not be missed and inserted into the socket. It should be straight and then squeezed. The pipe end should be inserted - it should exceed the mark, and the perpendicularity of the interface should be kept still for 2-3 minutes. During the interface process, it can be slightly rotated to facilitate uniform distribution of adhesive, but it shall not exceed 1/4 turn. It shall not be rotated after being inserted to the bottom. Wipe the spilled adhesive with cotton wool immediately after the end of gluing, and do not wipe the directly buried pipeline. For winter construction, the ambient temperature shall not be lower than - 100 ℃. When the ambient temperature is lower than - 100 ℃, cold and antifreeze measures shall be taken. The air in the construction site shall be kept unblocked and not sealed.
2. Compared with traditional cast iron drainage pipes and cement pipes, South Asia PVC pipes have the advantages of energy saving and steel saving, beautiful appearance, corrosion resistance, small specific gravity, good hydraulic strength, convenient construction and transportation, which are generally described as follows.
2.1 - Physical and chemical properties
South Asia PVC pipe is a thermoplastic product, which is processed by heating PVC into a molten state (150c ^ - 200c). It contains about 56% unique flame retardant element chlorine (ci). Therefore, it has a high chlorine index and is a refractory material with stable chemical properties. Its unique mechanical and physical properties enable it to be used normally up to 5. At the same time, its corrosion resistance and wear resistance are more stable than those of cast iron drainage pipes and cement pipes for a long time, which reduces the frequency of replacement and maintenance, reduces the operating costs and natural loss of materials, is conducive to the long-term use of buildings, and also increases the safety and reliability of building use_
2. 2 - drainage performance
According to the calculation of the gravity theory of the circulating water film, when the flow area of the drainage film does not exceed 1/3 ^} 1/4 of the sectional area of the riser, the larger drainage capacity of the plastic riser is 60% more than that of the cast iron pipe, without causing damage to the water seal. Therefore, for the same amount of drainage, the diameter of the drainage pipe can be smaller than that of the cast iron pipe, Or the same pipe diameter can use a smaller slope as far as possible within the allowable range of the specification, which can increase the clear height of the space, more beneficial to users, and enhance the use of the building
2.3 Light pipes and convenient construction
The proportion of PVC pipes in South Asia is about 1.4, which is only 1/5 of that of cast iron pipes. Plastic pipes of the same length are much lighter than cast iron pipes, requiring only manual handling during installation. Moreover, upvc pipes use socket type fusion bonding joints, which reduces the installation process. For example, a standard 6m long dn 11. The installation of plastic pipes can be completed by only one person, while the installation of cast iron pipes can be completed by 2-3 people, so the installation time of the project can be reduced by more than 50%, and the installation cost can also be reduced by more than 50%. For the construction unit, it can save expenses, reduce costs, shorten the project cycle, and improve the economy of the building.
2.4 Economical and beautiful
The unit price of PVC water pipe in South Asia is much lower than that of cast iron drainage pipe, and the construction cost per unit cost is lower than that of cast iron pipe of the same specification 7 yuan/resistance. In addition, because upvc pipes are light, their transportation costs are also reduced, which not only reduces the project cost, but also saves a lot of steel
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