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1. All terrains are drawn in accordance with the plan provided by the owner and the plan map of the new town.
2. The direction of pipelines shall be determined according to the requirements of the planning department, and the water supply pipes shall be laid on the north side of the mudstone road or on the east side of the road.
3, pipe attachments set the principle:
(1) Vented valve wells and exhaust valves shall be provided on the uplift of the pipeline and on the bridge, and drainage wells shall be provided in the low depressions of the pipeline. If the actual installation is to increase the starting point or low pit, an exhaust valve well or a drainage well shall be added.
(2) The exhaust valve adopts a single-port quick exhaust valve: (KP-10).
4. The buried depth of the pipeline is deduced from the elevation of the center of the pipe given in the figure. The thickness of the top cover is not less than 1.1 meters. For DN300 and above ductile iron pipes, 200mm stone pads and 100mm coarse sand pads are required.
5, ductile iron pipe selection T-type apron interface, K10 class; steel selection welding interface;
6, steel pipe using GB700-88, Q235 or Q235 standard steel. The design of the pipe fittings adopts the nominal diameter of GB1047-90 as the standard, and the connection of pipe sections with different pipe wall thickness is preferred to adopt the internal port flat connection.
7. The basic types of anti-corrosion of the inner and outer walls of the pipeline are: the inner wall is anti-corrosion epoxy resin, and the outer wall of the buried steel pipe is an epoxy coal-tar pitch paint wrapped glass cloth. The specification is two cloth three oil one bottom (two cloth five oil), the total thickness Not less than 0.6 mm; the quality standards for internal and external anti-corrosion are carried out according to relevant national standards. In order to ensure the construction quality of the anti-corrosion coating inside and outside the pipeline, there should be good coordination for the production, transportation, installation, and earthwork of the pipeline. When lifting, consideration should be given to considering the balance point, that is, lifting at two points to prevent the tube bending to damage the anti-corrosion layer.
8. Pipe trench pits should be accurately excavated in accordance with design elevations. For over-excavation, backfill grit should be used. In the event of pits being silt and virtual soil, silt and virtual soil should be excavated. Backfill grit thickness 0.30 m. Above, in case of rocks, over 0.30 meters shall be excavated, then leveled and filled with sand fill to the design elevation.
9. After the pipeline is laid, the backfill soil shall be compacted layer by layer compaction, the density shall reach 90%, and the thickness of each layer shall not exceed 0.20 meters. Within two pipelines and 0.20 meters above the top of the pipeline, the backfill soil shall not contain stones, bricks, rubble, etc. Dumps and hard mud blocks, backfill on both sides of the pipeline should be tamped simultaneously.
10. After the pipeline is laid and installed, the pump should be timely tested and covered with earth. If it cannot be pumped and soiled in time, it should be filled with water in order to prevent the pipeline from floating.
11, pipeline design work pressure is 0.8Mpa, pipeline pressure test should be consistent with "Water Supply and Drainage Pipeline Project Construction and Acceptance Specifications" GB50268-97 regulations, the experimental pressure of each pipe section and accessories for the 1.2Mpa.
12. During construction, attention should be paid to the safety of nearby buildings and underground facilities. The construction plan must be reported to the relevant management unit for approval. Pipeline is the preferred steel pipe for street passages, and ductile iron pipes should be considered second.
13. All steel pipes in piers, wells, etc. shall be strictly tested for electric spark and pressure resistance. Only after they are fully qualified can they be poured.
14. The welding process in steel pipe production and construction is determined according to the inspection conditions of steel plate samples. General steel pipe production should be carried out in the factory. The welding quality is accepted according to the acceptance specification GB50235-97 for construction of industrial pipelines. The surface quality standard for joint welds must meet the first-level standard in Table 7.3.1; the internal quality of joint welds must meet the requirements of the third-level standard in Table 7.3.3. The X-ray film inspection is performed on the supervision engineer's opinion that defects are likely to occur. The total number of sampling inspections is 1% of the total length of the welds. The steel pipe production and installation welding of this project can be referred to the specification: GB50236-98.
15. When the pipeline passes through the main road, the depth of the map is the minimum depth required by the process. If the construction requires, the depth of burial can be increased. However, the construction plan needs to be approved by the supervision engineer. At the same time, it needs to meet the requirements of the road management department.
16. Install a fire hydrant about every 120 meters on the water supply pipe, and use type SS100/65-1.0 ground-type fire hydrant.
The water supply network project is a three-phase project of the water supply network in the area: