(1) UPVC pipes (pieces) are used for drainage. Because of its light weight, corrosion resistance, high strength, etc., it is widely used in pipeline installation. Under normal circumstances, the service life is generally up to 30 to long-term durability according to standards. The UPVC pipe has a smooth inner wall and low fluid friction resistance, which overcomes the defect that the cast iron pipe affects the flow rate due to rust and scaling. The pipe diameter is also one size larger than the nominal diameter. For example, DN100 is U-PVC110. DN150 is U-PVC160. The pipe fittings are divided into oblique tees, crosses, elbows, pipe clamps, reducers, pipe plugs, traps, pipe clamps, and hangers.
(2) Drain glue for connection. The adhesive must be shaken before use. The pipes and socket parts must be cleaned up. The smaller the socket gap, the better. Use emery cloth or saw blade to roughen the joint surface. Brush the glue thinly inside the socket and apply glue twice on the outside of the socket. Wait for the glue to dry for 40-60s. After inserting it in place, attention should be paid to appropriately increase or decrease the glue drying time according to climate changes. Water is strictly prohibited during bonding. The pipe must be placed flat in the trench after it is in place. After the joint is dry, start backfilling. When backfilling, fill the circumference of the pipe tightly with sand and leave the joint part to be backfilled in large quantities. Use products from the same manufacturer. When connecting the UPVC pipe to the steel pipe, the joint of the steel pipe must be cleaned and glued, the UPVC pipe is heated to soften (but not burnt), and then inserted on the steel pipe and cooled. It is better to add a pipe clamp. If the pipe is damaged in a large area and needs to replace the entire pipe, the double socket connector can be used to replace the pipe. The solvent method can be used to deal with the leakage of solvent bonding. At this time, drain the water in the pipe first, and make the pipe to form a negative pressure, and then inject the adhesive on the pores of the leaking part. Due to the negative pressure in the tube, the adhesive will be sucked into the pores to achieve the purpose of stopping leakage. The patch bonding method is mainly aimed at the leakage of small holes and joints in pipes. At this time, choose 15-20cm long pipes of the same caliber, cut them apart longitudinally, roughen the inner surface of the casing and the outer surface of the pipe to be patched according to the method of bonding joints, and cover the leaking area with glue. The glass fiber method is to prepare a resin solution with epoxy resin and curing agent. After impregnating the resin solution with glass fiber cloth, it is evenly wound on the surface of the leaking part of the pipe or joint, and becomes glass fiber reinforced plastic after curing. Because the method has simple construction, easy-to-master technology, good plugging effect and low cost, it has high promotion and use value in anti-seepage and leakage compensation.
(3) The hydraulic test of the pipeline or pipe network system must be carried out after bonding and drying for 24 hours. The water pressure test of the pipeline must comply with the pressure test rules for non-metallic pipelines stipulated by the state. For the pressure test length of the pipeline without node connection ≯1.5km, the pressure test length of the pipe section with nodes ≯1km. The test pressure of the pipeline or pipe network shall not exceed 1.5 times the design working pressure, the minimum is ≮0.5MPa, and the test pressure shall be maintained for 2h or meet Special design requirements, no leakage is qualified. Pay attention to the conversion of pipe diameter when cutting the budget. It is also necessary to use the same manufacturer's products to prevent different manufacturers' products from different proportions of ingredients. It will cause weak bonding or not bonding at all.
