This project is the Tangshan residential community project 1#, 2#, 3#, 5# buildings and underground garages, and the 4# building is a public service facility building on the second floor. The main structure is reinforced concrete. The total construction area is 30089㎡, of which 1#, 2#, 3# and 5# buildings 1 1 floor are residential buildings, and 1 floor is storage room. The underground garage has a total area of 3,722 ㎡, and took refuge for class 6 second-class personnel in wartime. The building area of civil air defense is 2200m2.
1. The construction scope includes power and lighting distribution system, weak current system (integrated wiring system, cable TV system, security intercom system) and lightning protection and grounding system. The power supply load of the power supply and distribution system is divided into two levels and three levels. Secondary load: fire electricity, emergency lighting and public lighting. Grade III load: other electricity load and residential lighting. Meter boxes are concentrated in the basement, and each household measures separately. The capacity of each household electrical equipment is calculated as 4KW.
2. Power supply and accessories system: the power supply voltage is 380V/220V, which comes from the residential power distribution. TN-C-S grounding system is adopted for cable incoming. The pen line at the power supply entrance is repeatedly grounded. The neutral line (N) and the protection line (PE) are respectively led out by the repeated grounding of the incoming distribution box. N-wire is insulated from ground wire.
3. Power distribution line: BV-500V conductor and YJV-0.6/ 1KV cable are used for power distribution line. The basement distribution trunk line is laid underground with wires passing through steel pipes; Vertical distribution trunk lines are laid in the stairwell wall through steel pipes; Distribution trunk lines and power lines are buried through water gas hot-dip galvanized steel pipes; Indoor lighting and socket branches are laid in the dark through PVC hard flame retardant pipes; The vertical trunk line of weak current line is laid through water gas hot dip galvanized steel pipe; Indoor weak current branch pipes are laid with JDG steel pipes.
4. Emergency lighting: set evacuation lighting in corridors, hallways, stairwells, main entrances and exits, etc. Emergency lighting lamps shall be made of incombustible materials, and the working time of evacuation lighting battery shall not be less than 30min. When emergency lighting lines and fire hydrant lines are laid in the dark, they should be located in incombustible structures, and the protective layer should be not less than 3CM. When laying in the open air, it should be coated with fireproof paint.
5. Lightning protection and grounding: This project is a three-class lightning protection building. Lightning arrester adopts φ 10 galvanized round steel as exposed lightning protection zone, and the grid of lightning protection zone is not more than 20m*20m. All raised metal structures and metal pipes on the roof are reliably and electrically connected with the lightning protection belt. The down conductor is usually welded by two main bars with a diameter greater than 16mm in the constructional column and connected to the grounding device. The grounding device is usually welded by two main bars with a diameter greater than 16mm in the foundation slab. A week of galvanized flat steel is laid outside the building as an artificial grounding electrode. The buried depth of outdoor grounding device should not be less than1.1m. This project adopts public grounding. Grounding resistance is not more than 1 ohm.
6. The emergency lighting and fire-fighting related power supply of underground civil air defense part is Class I load, civil air defense lighting and submersible sewage pump are Class II load, and the rest are Class III load. Power supply includes lighting, power and fire fighting, which are led out from the power distribution room on the first basement. At ordinary times, power and lighting run in different circuits respectively, and they are mutually standby in case of accidents. Fire-fighting equipment is the other way, and the two ends are switched.
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