Content introduction 1. Design basis 1. National architectural standard design atlas. 2. Building plan, rainwater and sewage plan and other data provided by Party A. 2、 This drawing is the construction drawing of outdoor water supply and sewage works in Area A of a village reconstruction project. 3、 The elevation of the Yellow Sea system is adopted in this drawing, and Beijing has three coordinates. The dimensions noted in the drawing are in meters except for the pipe diameter, which is mm. The sewage elevation noted in the drawing is the elevation of the pipe bottom, and the water supply elevation is the elevation of the pipe center. 4、 Sewage project 1. Pipe material: D300 plain ended reinforced concrete pipe is used as the main material 2. Pipeline foundation: when there is no underground water in the trench, 20cm3: 7 lime soil cushion, C15, 180 ° concrete sleeper foundation shall be used, and the national standard drawing 95S516-6 shall be referred to; When there is groundwater in the trench, construction dewatering shall be carried out to ensure dry trench construction. After dewatering, 20cm gravel cushion shall be used under the foundation. 3. Pipe interface: 1:2.5 cement mortar tape interface, refer to national standard drawing 95S516-17. 4. Inspection shaft: the main line adopts the? 1000 closed type brick round manhole, the manhole cover is made of heavy ductile iron, and the manhole in front of the building is made of? 1000 round brick inspection well, and the manhole cover is made of? 1000 light nodular cast iron manhole cover, the inner and outer walls of the inspection well shall be plastered to the top of the well with 1:2.5 waterproof cement mortar after pointing. Refer to the national standard drawing 02S515-20. 5. The septic tank is made of bricks, with models of Z3-6SQF (6 m3) and Z4-9SQF (9 m3). 6. After the main body construction is completed, the construction can be started only after the elevation, pipe diameter and position of the outlet pipe are checked. When the outlet pipe is different from this construction drawing, the location of the sewage well in front of the building shall be subject to the actual outlet pipe position and pipe diameter of the building. 7. After the sewage pipeline is installed, the closed water test shall be carried out according to the specification, and the backfilling can be carried out only after it is qualified. 8. Trench backfilling: 2:8 lime soil shall be used for layered compaction, with the compactness of 95%. 5、 Municipal water supply and fire fighting 1. Pipe materials: ductile iron pipes and pipe fittings shall be used for municipal water supply pipes with diameters greater than or equal to 75MM, and PP-R pipes shall be used for pipes with diameters less than 75MM; Ductile iron pipes and fittings are used for fire fighting pipes. 2. Valve: gate valve, model Z45X-10 3. Pipeline foundation: plain soil compacted foundation, special treatment for special sections 4. Pipe interface: rubber ring flexible interface is used for ductile pipe, and 1:2.5 asbestos cement mortar is used for opening of local cast iron pipe fittings; PP-R water supply pipe adopts hot-melt bonding,; See the design drawing of the water supply company for the construction of water meter well, gate well and fire hydrant well 5. Water meter and fire hydrant: A master meter is set at the entrance of the community, and DN100 double port fire hydrant with model SX100-1.0 is used. See 88S162 for details. 6. Trench backfilling: 50cm below the road structure layer, 2:8 lime soil shall be compacted in layers, and the rest shall be compacted with plain soil, with a compactness of more than 95% 7. After installation of pipes, flushing, disinfection and pressure test shall be carried out according to<<Code for construction and acceptance of outdoor water supply and drainage>> 6、 Other precautions 1. Recheck the elevation of the original water supply pipeline and relevant pipelines before construction. If it is inconsistent with the design, please contact the design in time. 2. The location, elevation and diameter of all outgoing pipes in this drawing shall be subject to that of outgoing pipes. 3. Matters not mentioned shall be carried out in accordance with relevant national regulations.
