Construction requirements of pvc pipe filtration for revetment, specification for outdoor drainage pipeline construction 1, material acceptance 1) The specifications and varieties of water supply pe pipes and fittings shall meet the design requirements, with uniform wall thickness, smooth and tidy inside and outside, and no sand holes, cracks, flying thorns and bumps. Pipe fittings shall be in good shape, qualified in size and have factory certificate. 2) Valves, flanges and other equipment should have quality certificates, no cracks, flexible and tight switches, good casting and good handwheels. 3) Pipe clamp, oil, hemp, pad and raw tape shall be carefully checked and accepted. 2. General provisions for pipeline installation and laying 1) Pipes shall not be laid on frozen soil. 2) Pipeline installation shall be carried out from downstream to upstream in turn, with the socket connecting the pipeline facing the water flow direction and the socket installed along the water flow direction. 3) When the pipeline crosses the highway and other loads, a casing shall be set, and there shall be no interface in the casing, and the casing shall be twice larger than the external diameter of the pipeline. 4) When the pipeline installation and laying project is interrupted, the nozzle shall be closed with a cork or other covering to prevent sundries from entering. 5) The pressure grade of valves and fittings used in water supply pipeline shall not be lower than the designed working pressure of the pipeline, and meet the requirements of the pipeline hydrostatic test pressure. 6) Before pipeline construction, the layout of other underground pipelines along the pipeline must be mastered. The horizontal clear distance between adjacent pipelines should not be less than the width of slotting required for construction and maintenance and the width required for setting auxiliary structures such as valve wells. Drinking water pipes should not be laid under drainage pipes and sewage pipes. 3. Preparation before pipeline laying 1) Pipeline laying shall be carried out after the trench bottom elevation and pipeline foundation inspection are qualified. Before pipeline laying, pipes, pipe fittings, rubber rings, valves, etc. Visual inspection shall be carried out, and any problems found shall not be used. 2) Prepare running tools and ropes, and conduct safety inspection. Pipes with a diameter greater than 150mm can be laid by pry rope method. Protective measures should be taken for the pipeline interface connected with the twisted mouth. 3) If the pipeline pier needs to be set, the pier location setting should have been completed. 4) Before pipeline installation, compressed air or other gases shall be used to purge the inner cavity of the pipeline to make the interior of the pipeline clean. Installation and preparation of pipeline connection (bonding, rubber ring connection, hot melt connection, twisted connection), pipeline cleaning and its accessories are laid in place. Pipeline anticorrosion (heat preservation) has been set up. Trench acceptance, pipeline positioning, pressure test, flushing and pipeline laying are 1). The pipeline shall be laid on the undisturbed soil foundation or on the backfill layer that meets the design requirements after excavation. For the buried test pipeline above the undisturbed ground, the backfill treatment layer at the bottom of the pipeline must fall on the undisturbed soil layer that reaches the bearing capacity. 2) When laying the pipeline, the pipeline can be placed along the direction of the pipeline at the ditch side and then placed at the bottom of the ditch in turn. In order to reduce the amount of work in the ditch, the hot-melt pipe is grounded to the ground for a certain length, and then the pipe is laid after curing, and then the pipe is laid by elastic pipe laying method after bonding for a certain length; The flexible connection of rubber ring should be in the groove.