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The steel-plastic pipe manufacturer tells you that the main component of bellows is polyvinyl chloride, and other components are added to enhance their heat resistance, toughness, ductility and so on. The top layer of the surface film is lacquer, the main component in the middle is polyvinyl chloride, and the bottom layer is the back coating adhesive. It is a popular and widely used synthetic material in the world today. Its global use ranks second among all synthetic materials. According to statistics, in 1995 alone, the production of non-PVC in Europe was about 5 million tons, while its consumption was 5.3 million tons. In Germany, the average production and consumption of PVC is 1.4 million tons. PVC is being produced and applied worldwide at a growth rate of 4%. In recent years, the growth of PVC in Southeast Asia is particularly significant, which is attributed to the urgent need for infrastructure construction in Southeast Asian countries. PVC is the most suitable material for producing three dimensional surface film.
Steel corrugated culvert is a high-quality highway building material to replace circular culvert, cover culvert and small bridge. The product has the advantages of short construction period, light weight, convenient installation, good durability, low factory cost, strong anti-deformation ability and reduced maintenance cost after opening to traffic. It is suitable for alpine frozen soil area, soft soil roadbed zone and deep fill zone, which can save a lot of money and have obvious economic benefits. Culverts, corrugated culverts, steel corrugated culverts and metal corrugated culverts have strong adaptability to foundation deformation, lower requirements for bearing capacity and smoothness of foundation, and the actual cost of engineering is similar or lower than that of similar span bridges and culverts.
If the eaves need to turn one roof to face another roof and continue to extend, it is necessary to ensure that the two hangers closest to the roof corner are at the same horizontal height. Install the inner (outer) corner at the corner, and install one eaves hanger at each side of the roof 300 mm away from the corner. When installing eaves trench, first insert the hanger into the front and back clip grooves of eaves trench (one hanger should be allocated per 650 mm, each eaves trench should have at least four eaves trench hangers). Fix the eaves trench hanger in the pre-buried expansion tube with special fixing screw, tighten the screw, and keep it from loosening. In order to ensure that the eaves can be welded permanently, gently polished with fine sand paper needs to coat the interface surface with special welding flux, and make sure that the surface is completely cleaned and the surface is completely dry due to polishing. Then the special welding flux is evenly coated on the surface, and then connected. At this time, if there is any leakage of welding flux, it should be wiped immediately to avoid staining the eaves and matching. The surface of the part (the same below). For specific matters concerning the use of welding fluxes, please refer to the special instructions for the use of welding fluxes.