General of a sales center in Beijing Office building? Electrical construction scheme
1. The project is adjacent to Songlin Middle Road (Guihua Road) in the south, Beijing Pharmaceutical Company in the west, and South Second Ring Road in the north. The structural form is frame shear wall structure, with a building area of 8770.95m2, including 5307.25m2 of above ground building area, 3463.7m2 of underground building area. The height of the second underground floor is 3.3m, 3.6m of the first underground floor, and 3.4m of the second to fifth underground floors, The total height is 18 meters, and the height difference between indoor and outdoor is 0.1 meters. 2. Project outline Project name Employer Designer General Contractor Contractor Contract duration 408 calendar days Contract quality objective Qualified 3. Electrical engineering overview 3.1 Power distribution, lighting distribution system 3.1.1 Power supply load level Except all fire-fighting equipment, automatic fire alarm, emergency lighting, evacuation signs, fire pump room system, passenger elevator Except for the secondary load in the living pump room, the rest are tertiary loads. Measures to prevent parallel operation shall be taken between emergency power supply and normal power supply. TN-C-S system is adopted as the grounding type of low-voltage distribution system, and the power incoming line is repeatedly grounded. After repeated grounding, PE and N lines are strictly separated. 3.1.2 All control boxes of this sub project can be ordered and processed only after the manufacturer completes the schematic diagram, wiring diagram, panel layout, equipment and material list, and submits them to the design unit for review and signature according to the design requirements. 3.1.3 High efficiency and energy-saving light source shall be used as lighting source. The light source of general places is mainly flat circular energy-saving lamps. The illuminance standards of various places shall be determined in accordance with the Standard for Lighting Design of Buildings GB50034-2004. Hall -- 300 Lx (12W/m2) stairs -- 50Lx (5W/m2) toilets, washrooms -- 75 Lx (7W/m2) fire control room -- 500 Lx (18W/m2) underground car garage -- 75 Lx (7W/m2) corridors, warehouses, etc. -- 100 Lx (10W/m2) product exhibition hall -- 200 Lx (8W/m2), and energy-efficient fluorescent lamps and compact energy-efficient lamps are used in places with decoration requirements. The color rendering index of the light source Ra ≥ 80, and the color temperature should be between 2500K and 5000K. 3.1.4 Lighting and sockets are powered by different branches, and the lighting is single-phase two-wire system, BV-2x2.5mm2; general sockets are single-phase three wire system, BV-3x4mm2, and all socket circuits are equipped with leakage circuit breaker protection. 3.1.5 The exit indicator light and evacuation indicator light shall be of AC/DC dual-use type, with built-in floating battery, and the continuous power supply time shall be more than 30 minutes. The shell of exit indicator light and evacuation indicator light shall be made of glass and other non combustible materials. 3.1.6 Fluorescent lamp tube shall be energy-saving, with luminous flux of more than 3000Lm. Fluorescent lamp shall adopt electronic ballast, cos Φ ≥ 0.97, and total harmonic distortion ≤ 10%. 3.1.7 When the installation height of lamps is lower than 2.4m, a PE line shall be added, which will not be marked in the plan. 3.1.8 Decorative lamps shall be negotiated with the decoration design and Party A. Functional lamps, such as fluorescent lamps, exit signs and evacuation indicators, shall be put into use only when they meet the design requirements with the inspection report of the national competent department. 3.1.9 Lighting lamps in public places such as underground garages, corridors, staircases, elevator halls, etc. are usually locally set with switch control or uniformly controlled by the building equipment monitoring system. The emergency lighting part is forced to be lit by the fire control room in case of a fire, and the fire control room has priority control. 3.2 Lightning protection and grounding system 3.2.1 The lightning protection level of this sub project is Class III. 3.2.2 Φ 10 galvanized round steel shall be used as lightning strip on the roof, and the grid of roof lightning connection wire shall not be more than 24mx16m. 3.2.3 The downlead shall be made of two main reinforcements with a diameter of more than 16 in the column or shear wall, and the distance between them shall not be more than 25m. The upper end of the downlead shall be welded with the lightning strip, and the lower end shall be welded with two main reinforcements in the upper and lower layers of reinforcement on the axis of the foundation bottom beam and foundation slab. The external wall downlead is led out at 1m below the outdoor surface and welded with the outdoor grounding wire, and two of the upper and lower main reinforcements on the axis of the foundation bottom beam and foundation bottom plate are welded to form the grounding grid. When the measured foundation grounding resistance is less than 1 ohm, the grounding electrode shall be added. The outdoor grounding electrode is more than 1.5m away from the building and 1m below the outdoor surface. The 40x4 galvanized flat steel is connected to form a horizontal grounding device. The vertical grounding electrode is Φ 50 galvanized steel pipe, 2.5m long, and the wall thickness is not less than 3.5mm. One piece is set every 5m, and three pieces form a group. 3.2.4 The lightning strip shall be installed openly, and all metal structures and metal pipes protruding from the roof shall be reliably welded with the lightning strip. Non metallic objects outside the protection range of roof lightning arrester shall be installed with lightning arrester and connected with roof lightning protection device. 3.2.5 The test clip shall be set 0.5m above the outdoor ground from the external wall downlead 3.2.6 All metal components protruding from the roof, such as metal poles, metal ventilation pipes, roof fans, etc., shall be reliably welded with the lightning strip. 3.2.7 All welding points of outdoor grounding shall be painted with asphalt for corrosion prevention 3.2.8 Lightning protection grounding and strong and weak current grounding of this subproject share the same grounding electrode, and the power incoming line is repeatedly grounded. The repeated grounding wire is led out to the lightning protection grounding device with 40x4 galvanized flat steel, and the grounding resistance is required to be no more than 1 ohm. If the actual measurement does not meet the requirements, an artificial grounding electrode is added. 3.2.9 The metal bridge in the strong and weak current shaft can be used as the grounding body, and the grounding conditions shall be reserved for the grounding terminal led out from the structural reinforcement nearby. 3.2.10 The grounding of low-voltage distribution room, elevator machine room, etc. shall be welded with the two main reinforcements led up from the nearby column. The two main reinforcements (set separately from the lightning protection downlead) shall be welded to the foundation grounding grid from the bottom. 3.2.11 Two BV-1x25mm2 PC32 are respectively led down and connected with the foundation grounding grid for the grounding of each weak motor room. 3.2.12 All metal shells of electrical equipment that are normally uncharged but may present voltage when the insulation is damaged shall be reliably grounded. 3.2.13 In order to prevent the high potential generated by lightning current from striking back the nearby metal objects or electrical lines, overvoltage protection devices are set at the main distribution cabinet where the external power supply is introduced, at the distribution box of the roof electrical equipment, at the computer power supply system, at the cable TV lead-in end, and at the telecommunication lead-in end. 3.2.14 Main equipotential bonding is adopted for this subproject, and the main line in the building shall be protected. Equipment incoming line header. Building metal components shall be connected. The total equipotential bonding line adopts BV-1x25mm2 PC32. See the Equipotential Bonding Installation 02D501-2 for specific procedures. 3.3 Equipment installation 3.3.1 All distribution boxes are concealed unless otherwise noted. 3.3.2 Unless otherwise specified, all lighting switches are 250V/10A, and the bottom edge of concealed installation is 1.3m from the ground; The emergency lighting switch shall be equipped with indicator light. All sockets are concealed safety sockets. Except as noted in the electrical legend table, the installation height of other sockets is 0.3m from the bottom to the ground. The switches and sockets in the toilet shall be moisture-proof and splash proof panels. 3.3.3. Cable bridge: closed metal bridge. During construction and installation, attention shall be paid to cooperation with other disciplines. 3.3.4 When the cable tray passes through the smoke compartment, fire compartment and floor, it shall be filled and blocked with fireproof materials after installation. 3.3.5 The exit indicator light shall be installed openly. When it is installed above the door, the bottom edge shall be 0.2m away from the door frame; If the door cannot be installed, it shall be installed on the wall beside the door, and the top shall be 50mm away from the ceiling. Evacuation guidance indicator light shall be installed in a concealed manner, with the bottom edge 0.3m above the ground (chain hoist installation, with the bottom edge 2.5m above the ground). 3.3.6 All distribution boxes (cabinets) in this project are non-standard products except the specified stereotyped boxes (cabinets), and the external dimensions noted are reference dimensions. The manufacturer shall complete the control schematic diagram, wiring diagram, panel layout drawing and equipment and material list according to the design requirements and the national standard atlas. After being approved by the relevant fire protection installation company and automatic control installation company, Order and processing can be made only after the design unit has reviewed and signed. The control box (cabinet) provided by the water and heating professional equipment shall cooperate with the design unit before ordering. 3.3.7 SC20 steel pipe is reserved between VRV indoor unit and its control switch. 3.4 Selection and laying of cables and conductors 3.4.1 ZR-YJV-1KV cross-linked polyethylene copper core flame-retardant power cable shall be selected as low-voltage outgoing cable; NH-YJV-1KV cross-linked polyethylene copper fire-resistant power cable shall be selected as the outgoing line of emergency trunk line. The cable shall be laid exposed on the bridge. If it is not laid on the bridge, it shall be laid through steel pipes. 3.4.2 All branch lines shall be BV-0.45/0.75KV, concealed laying through galvanized steel pipe, except that NH-BV-0.45/0.75KV or ZR-BV-0.45/0.75KV PVC insulated conductors shall be selected as outgoing lines of power dual power mutual input box. 3.4.3 The emergency lighting branch line shall be concealed in the floor or wall through steel pipes. The line from the roof junction box to the ceiling lamp shall be concealed in the floor or ceiling through steel (fire-resistant) corrugated pipes or Pulica pipes. The ordinary lighting branch line shall be concealed in the floor or ceiling through steel pipes. 3.4.4 Unless otherwise specified, the wires shall be laid along the trunking; At the wireless slot, the pipes shall be concealed on the ground, floor or wall, and the pipe diameter shall meet the design and national specifications. 3.4.5 When different types of conductors are laid in the same metal trunking, metal separation shall be made. When two power circuits of the same fire fighting equipment are in the cable trunking, they shall be separated by partitions. 3.4.6 When the open laid power cable of fire protection electrical equipment passes through closed metal trunking or metal pipe, it needs to be treated for fire prevention and coated with fire retardant coating. In case of concealed laying, it shall be laid in pipes and incombustible structures, and the thickness of protective layer shall not be less than 30mm. 3.4.7 In principle, the installation path and height of all cable trays and trunkings are as shown in the construction drawings, but they need to be further confirmed after on-site pipeline integration. The construction site can make appropriate adjustments according to the actual situation. 3.4.8 The distance between the bottom of the cable tray installed in the ceiling and the ceiling keel shall be more than 50mm. In principle, the installation path and height of the cable tray in other places shall be constructed according to the electrical construction drawing. During construction and installation, attention shall be paid to cooperation with other types of work, and proper adjustment can be made according to the comprehensive situation of the pipeline on site to avoid rework. 3.5 Power supply design 3.5.1 The 380/220V low-voltage power supply supplied by the outdoor box transformer substation is introduced to each low-voltage distribution box in this sub project, and the power and lighting loads of this part are borne respectively. 3.5.2 The low-voltage distribution system adopts the combination of radial and trunk type. For important loads, radial power supply is adopted; The combination of trunk type and radial type power supply is adopted for lighting and general load. 4. Weak current system 4.1 Generic cabling system 4.1.1 The project uses generic cabling system. The data information and voice information of horizontal cabling computer use UTP unshielded twisted pair of super five types, the computer information of vertical trunk uses optical fiber, and voice information uses HYV telephone cable. 4.1.2 In view of the fact that most offices in this project are large bays, only network cabinets, vertical trunk systems, horizontal routing trunking and a few points are set up. CP assembly points are reserved in the ceiling of large bays, and 20 pairs of information points are reserved for each CP assembly point. 4.1.3 Multi core optical cable and HYV telephone cable shall be reserved on each layer to network cabinet as a necessary condition for vertical trunk subsystem to ensure external communication of users. Enough telephone horizontal wiring terminals and optical cable distribution frames shall be reserved in the electrical shaft on each floor to provide conditions for user connection as a horizontal subsystem. The system user can set it according to their own needs. 4.1.4 The data information socket shall be installed in a concealed manner, with the bottom edge 0.3m from the ground. 4.1.5 The system is constructed by professional subcontractors. 4.1.6 The integrated wiring optical switch and distribution frame are located in the weak current room on the first floor. 4.2 Security TV monitoring system 4.2.1 The project is equipped with a security TV monitoring system. The front-end equipment is located in the weak current room on the first floor, and cameras are set at the main entrance and exit, the first floor lobby and exhibition hall, and the elevator hall on each floor for security TV monitoring. All lines are laid along cable trenches or through steel pipes. 4.2.2 Each monitoring point is provided with 2XSC20 welded steel pipe concealed along the top plate. 4.2.3 The system is constructed by professional subcontractors. 4.3 Automatic fire alarm system 4.3.1 Fire system composition and fire control room. 4.3.1.1 Fire fighting system composition: automatic fire alarm system; Fire emergency broadcasting system; Direct fire intercom telephone system. 4.3.1.2 Fire control room: the protection object of the automatic fire alarm system of this project is Level II. The automatic fire alarm control panel is set in the fire control room on the first floor to detect, monitor and control the fire protection of the whole building. The alarm control equipment in the control room is composed of automatic fire alarm control panel, fire emergency broadcasting equipment, fire direct intercom telephone, etc. 4.3.1.2.1 Automatic fire alarm system: the project adopts centralized automatic fire alarm control system. Smoke or temperature detectors and manual alarms shall be set according to the specification requirements. 4.3.1.2.2 General lighting and power supply cut-off control system: the lighting of staircases on each floor and the lighting of control rooms are all emergency lighting. In case of fire, the fire control room can automatically or manually cut off the non fire power supply in the fire area through the intermediate relay according to the fire situation. 4.3.1.2.3 Fire emergency broadcasting system: fire emergency broadcasting cabinet (set) is set in the fire control room on the first floor. The fire emergency broadcasting unit adopts constant pressure output (output power: 300W). Horn type 3W fire-resistant speakers are set at appropriate locations such as the roof layer. The corridors and public parts on other floors are equipped with fire-resistant 3W speakers, which are installed on the roof, The diameter of loudspeaker is 200mm. The fire emergency broadcast circuit is divided according to the building floor. One circuit on each floor is also used as the background music broadcast at ordinary times. In case of a fire, the fire broadcast is switched. The person on duty in the fire control room can automatically or manually broadcast the fire emergency according to the fire area, and timely command and guide the evacuation personnel from the fire site. In case of fire on the second floor, the fire floor and its adjacent upper and lower floors shall be connected first; In case of fire on the first floor, this floor, the second floor and the underground floors should be connected first; In case of fire in the basement, all underground floors and the first floor shall be connected first; In other cases, the same is true. 4.3.1.2.4 Firefighting direct talk back telephone system: fire direct talk back telephone switchboard is set in the duty room on the first floor. In addition to the fire direct talk back telephone jacks set at appropriate locations near the evacuation exits of corridors on each floor, fire direct talk back telephone extensions are set in the power distribution room, smoke exhaust room, etc. It is required that the telephone switchboard and each extension in the duty room and the interphone socket can call each other for interphone. The fire telephone extension shall be a red non dial telephone, and the telephone and interphone socket shall be equipped with a special and obvious sign of "fire alarm". Special automatic fire alarm external telephone is set in the duty room. 4.3.1.2.5 The fire hydrant button is located in the fire hydrant. The junction box is at the door opening side of the fire hydrant, 1.8m from the bottom to the ground. After the fire hydrant button acts, the alarm position shall be displayed in the fire duty room. 4.3.1.2.6 Manual alarm button and fire intercom telephone outlet shall be set at proper position of the building. The special telephone, manual alarm button and intercom telephone shall be installed at the bottom 1.3m above the ground. 4.3.1.2.7 Elevator control: the fire control center can display the operation status of the elevator, and send a control signal in case of fire, force all elevators to lower to the first floor and open the door, then cut off the power of the elevator, stop the operation, and the fire control center receives the feedback signal of the elevator at the same time. 4.3.1.2.8 Fire pump control and linkage requirements: the starting mode of fire hydrant pump is: fire hydrant button with action indicator in the box; It is controlled in the fire control center. 4.3.1.2.9 Fire fan control and linkage requirements: The fire center can automatically control the fire fan through the automatic fire alarm control module, and can also manually control it on the linkage console and receive its feedback signal. A 280 ℃ fire damper is set at the outlet of the smoke exhaust fan. When the smoke temperature reaches 280 ℃, the smoke exhaust fan stops. 4.3.2 System grounding: the fire protection system is shared with the building grounding device, and the grounding resistance is not more than 1 ohm. A special grounding plate is set in the fire center. The special grounding main line is led from the special grounding plate of the fire center to the grounding body. The special grounding main line uses copper core insulated conductor with a section of not less than 25mm and a branch line of not less than 4mm. 4.3.3 All fire-fighting equipment shall be equipped with dual power terminal automatic switching device. 4.3.4 The main exits are equipped with emergency exit indicator lights, and the stairwell is equipped with floor indicator lights, all with batteries, with a duration of ≥ 30 minutes. 4.3.5 Other 4.3.5.1 The control mode of the first floor duty room is automatic or manual. 4.3.5.2 The manual alarm button shall be provided with protective measures to prevent misoperation. 4.3.5.3 The function and shape of the automatic fire alarm control equipment shall comply with the current specifications of China. All fire alarm equipment, detectors, etc. shall have the test certificate of the National Fire Detection Center. 4.3.5.4 The selection of signal wires, special control cables, wires, etc. of all equipment connected to the fire protection system must meet the requirements of Beijing Fire Protection Bureau. 4.3.5.5 Fire resistant cables and wires shall be selected for all cables and wires connecting fire fighting system equipment. 4.3.5.6 When the fire control, communication and alarm lines are laid in a concealed way, metal pipes are used to lay in the structural layer of the incombustible body, and the thickness of the protective layer should not be less than 30mm. When exposed laying is adopted, metal pipe or metal trunking shall be used for protection, and fireproof coating shall be painted on the metal pipe or metal trunking. 4.3.5.7 The system is constructed by professional subcontractors. 4.4 Cable TV system 4.4.1 Cable TV signal is introduced from outside SYV-75-12. The trunk line is laid along the weak wire trough in the shaft with SYV-75-9, and the branch line is laid in a concealed way with SYV-75-9-SC20. TV information socket shall be installed in a concealed way, with the bottom edge 0.3m from the ground, except for those specially marked. User level requirements 69 ± 6dB The front end box is located in the weak current room on the first floor. 4.4.2 The system is constructed by professional subcontractors. 4.5 Garage management system 4.5.1 The entrance and exit lane equipment of the garage management system includes the ticket machine, card reader, internal telephone, camera, gear lever, expense display, etc. to identify the vehicles entering and exiting, so as to prevent the vehicles from being stolen. The vehicle entry system can accurately establish the upper contour of the outer surface of the vehicle, and can simulate the shooting of high-resolution vehicle images. It can quickly and automatically detect the vehicle license plate, extract data from the image, and then compare the number and image of the parked license plate with the bill and vehicle feature records. 4.6 Building equipment monitoring system (BAS), Reduce the operation cost of each system, provide a comfortable working environment, and facilitate the realization of property management automation. 4.6.2 The host of building equipment monitoring system is set in the fire duty room on the first floor. 4.6.3 The communication interface shall be reserved between the building equipment monitoring system and the automatic fire alarm and linkage control system, as well as the safety protection system. In case of fire, the building equipment monitoring system shall be able to automatically or manually select relevant areas for fire prevention or security linkage operation according to the requirements of the fire control room or the security control room. 4.6.4 Building equipment monitoring system (BAS) includes: 4.6.4.1 Control of air conditioning system: 4.6.4.1.1 Exhaust fan, supply (inlet) fan: fan start/stop and time program control, status display and fault alarm. 4.6.4.1.2 The installation position and control requirements of HVAC equipment shall be subject to the design drawings of HVAC discipline. 4.6.4.2 Control of water supply and drainage system: 4.6.4.2.1 Water supply system: municipal water supply pressure detection and display; Underground water level display and alarm; High level water tank water level display and alarm; Start/stop control, status display and fault alarm of water pump; Pump rotation and automatic operation of standby pump. 4.6.4.2.2 Rainwater and drainage system: water level display and alarm of rainwater, sewage and wastewater wells; Control the number of drainage pumps according to the water level; Water pump start/stop control, status display and fault alarm; Pump rotation and automatic operation of standby pump. 4.6.4.3 Monitoring and control of power distribution system: low-voltage power distribution system: incoming line, bus coupler switch status display and fault alarm; Incoming line current/voltage display; Feeder current display; Power factor measurement; Active/reactive power metering. 4.6.4.4 Control of lighting system: lighting in public places; Hall, staircase and walkway lighting; Time program (or photosensitive element) control of underground garage lighting. 4.6.4.5 Elevator control: elevator operation status monitoring and fault alarm. 4.6.5 Building equipment monitoring system BAS control boxes (shown as DDC in the plan) are connected by SC20 steel conduit. BAS control boxes are all connected in series and led to the fire duty room on the first floor. 4.6.6 The computer host, display, printer in the BAS control room of the office building and various sensors, transmitters and BAS controllers on the site shall be supplied by the Contractor in a complete set, and the system composition and detailed design shall be carried out. 4.6.7 The emergency lighting box is used for both peacetime and fire fighting. In case of fire, fire fighting is preferred and is not controlled by DDC.
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![[Beijing] Comprehensive Office Building Secondary Structure Construction Scheme (Node Details) - Figure 2](https://fd.co188.com/group1/M03/9B/CD/rBBhIF1HfOqAUUL1AABYv0mADyw724-2.jpg "[Beijing] Comprehensive Office Building Secondary Structure Construction Scheme (Node Details) - Figure 2")
