The selection of pipes should comply with the current national standard "Safety Evaluation Standards for Living and Drinking Water Transmission and Distribution Equipment and Protective Materials" GB/T 17219. At the same time, the bidding units are strictly managed, and they must have and handle the commodity inspection report and the product quality certificate. Before construction, we must ensure that the quality of materials and equipment meet the requirements of the construction project, and secondly, we must clarify the corresponding responsibilities to ensure that the project can be carried out safely and effectively. Before the construction of the water pipeline, a joint review of drawings by the design unit, the construction unit and the supervision unit shall be carried out. The technical personnel of the construction unit must do a good job of on-site handover and technical disclosure, and make meeting minutes and actual work records. In the early stage of construction, the obstacles along the pipeline construction should be removed in place to effectively ensure the continuity of construction. Find the stake number according to the construction drawings to ensure the accuracy of the project construction. The construction work belt is generally 14m to 18m, and it should not be too short, otherwise it will affect the construction effect and lengthen the construction period. The working belt should not be too long, so as not to waste land resources. The construction unit shall lay out the 100-meter piles according to the construction drawings and the actual situation, and set out the line.
The location of the water pipeline laying should keep a certain distance from buildings, railways and other pipelines, and the distance should not be less than the current national standard "Code for Design of Outdoor Water Supply" GB 50013. The water pipeline is generally laid above the sewage pipe. If it must be below the water pipeline, a pipe sleeve with good sealing performance should be added. The two ends of the pipe sleeve are sealed with waterproof materials. less than 3m. When the water pipeline and the sewage pipeline are arranged in parallel, the clear distance between the outer walls of the two pipes should not be less than 1.5m. When the water delivery pipeline intersects with the water supply pipeline, the net distance should not be less than 0.15m. The depth of burial of water pipelines should be determined according to factors such as geological conditions, freezing conditions, external loads, pipe strength, and intersection with other pipelines. In areas with high soil bearing capacity and low groundwater table, the pipeline can be buried in the natural foundation of the pipe trench. In areas with soft soil, the pipeline should be treated with foundation, and concrete foundation should be used. In rocky or semi-rocky areas, the bottom of the pipe should be covered with a sand cushion with a thickness of 100mm to 200mm. Outdoor pipelines should be equipped with adjustable pipeline expansion and contraction facilities, and anti-freezing and thermal insulation measures should be taken.
