Intelligent building electrical engineering construction scheme?

summary of electrical engineering construction scheme of intelligent building: the steel pipes used in this project are water-gas steel pipes, with uniform wall thickness, uniform weld seam and no splitting, sand holes, burrs and hollowing. The pipes should be painted with antirust paint, and the steel pipes should have factory product certificate.

Electrical engineering construction scheme of intelligent building

The power supply of this project is drawn from the low-voltage distribution room on the first floor of the west building, with a total installation power of 2869.7kW and calculated active power.

1. Construction scope of electrical engineering:

The construction scope of this project mainly includes: underground laying of steel pipes, threading in pipes, cable bridge installation, cable laying, distribution box (cabinet) installation, lamp installation, switch and socket installation, telephone piping and wiring system, fire alarm system, computer network wiring debugging, lightning protection and grounding system manufacturing, installation and debugging, TV system, security monitoring system and new fan monitoring system.

2. Power supply and distribution system:

In this project, four loop power cable lines are led from the main power distribution room of the West Building to the power distribution room on the first floor of this building, and two power distribution cabinets are managed in the power distribution room, of which MAA1－1MAA4 is the power cabinet, 2MAA1-2MAA2 is the lighting cabinet, 2LAA1-2LAA2 is the power cabinet, 1LAA1-1LAA4 is the power cabinet, and 1kAA1-.

the power supply is introduced with cables and laid along the cable bridge after passing through the wall. The cable passing through the wall should be waterproof according to the requirements of the specification, and its buried depth should not be less than .7m from the outdoor ground, and it should have an adaptive waterproof slope. Unless otherwise indicated, the cable protection tube extends out of the wall for 1m. The outdoor cable laying is not reflected in the drawing, so it should be negotiated with the design unit and Party A during the construction.

3. Installation of cable tray:

(1) Material requirements: This product should be galvanized and shaped, and its specifications should meet the design requirements. The inside and outside of the tray should be smooth and flat, and there should be no distortion such as distortion and edge warping, and the product certificate should be issued.

(2) Installation of cable tray:

The cable tray used in this project is TJ6×15, and the installation methods are all installed along the suspenders in the ceiling board, which is 3.m away from the indoor ground, and the cable tray is a double-layer tray from axis 1 to axis 6. Angle steel L3×3×4 should be used for the suspenders in the double-deck bridge section, and the expansion bolts should be used. 12, the fixed points are in accordance with the requirements of the specification, generally not more than 1.5m According to the No.37 document of a city's construction engineering quality supervision station, the galvanized cable bridge can be used without crossing the grounding line, but galvanized nuts, flat pads and spring pads must be used at the lap joint of the bridge.

as shown in the figure, the derrick shall be constructed by the method of 92DQ5 standard atlas, drawing No.5-58, angle steel hanger type or round steel hanger type. TJ6×15 galvanized products are used for the bridge in the high-voltage well, and the bridge is led up to the fifth floor along the wall in the pipeline well.

4. Underground laying of steel pipes:

(1) Material requirements:

The steel pipes used in this project are water-gas steel pipes, with uniform wall thickness and uniform weld seam, without splitting, sand holes, edges and hollowing. Anti-rust paint should be painted in the pipes, and the steel pipes should have the factory product certificate and be stamped with the supplier's red seal.

(2) Buried laying of steel pipes:

All pipelines in this project should be laid along the wall or in the roof, and the connection of pipes should be connected by sleeves. The length of sleeves with suspended ceilings should be 1.5-3 times of the connecting pipe diameter, and the counterpart of the connecting nozzle should be in the center of the sleeve, and the welding joint should be firmly welded and tight. If the pipeline is too long to exceed the specification requirements, an intermediate junction box should be installed, and the pipes should be placed in boxes, which should be arranged. If shaped products, boxes and boxes are used, the knock-out holes are large and the pipe diameter is small, they should be padded tightly with iron washers or filled with mortar and gypsum, and there should be no exposed holes, so as to prevent water from entering the box. The concealed pipes in the box can be welded and fixed on the edge of the box by crossing the ground wire. It is forbidden to weld the nozzle with the knock-out holes, and the nozzle should be less than 5mm, and the thread of the iron lock nut should be 2-4, with more than two pipes. The concealed steel pipes should be laid along the nearest route and the bending should be reduced. The clear distance between the pipes buried in the wall or concrete and the surface should not be less than 15 mm. The steel pipes entering the floor-standing distribution box should be arranged neatly, and the nozzle should be not less than 5mm above the foundation surface. When passing through the building foundation, protective pipes should be added.

For concrete wall piping, boxes and boxes can be fixed on the steel bars of the wall and then laid with pipes. Each next door is about 1m long, and the pipes are bound with lead wires and put into the boxes. The boxes should be simmered in the fork bend, and the upward pipes should not be too long. In order to be able to simmer, cast-in-situ concrete floor piping should be conducted. First, find the lamp position, pop up the crosshairs according to the thickness of the walls around the room, and fix the blocked boxes firmly. Then, lay pipes and pipes.

(3) The process flow of laying concealed pipes:

Laying concealed pipes → prefabrication → determination of box position → stable injection of boxes → laying and connection of pipelines (pipeline laying method: 1 piping along the wall, 2 in the cast-in-place concrete wall, 3 in the floor) → ground connection: 1 crossing the ground wire, 2 anti-corrosion treatment. Steel pipes buried in the soil layer should be brushed with asphalt wrapped with glass fiber cloth, and then with asphalt oil, or cement mortar should be used for comprehensive protection. The steel pipes laid in the basement and the second floor should be jacketed when entering the equipment foundation, and the steel pipes leading to the equipment foundation can be equipped with waterproof elbows at the nozzle.

(4) Quality standard:

1) Tight connection, smooth nozzle, complete mouth protection, neat arrangement, no obvious wrinkle at the bend of the pipe, complete anti-corrosion paint, and the protective layer of concealed piping is greater than 15mm.

2) put the pipe into the box, the exposed length in the box is less than 5mm, and the exposed thread of the nozzle fixed with the lock nut is 2-4 buttons.

(5) finished product protection:

1) Don't trample when laying pipelines. When pouring concrete with bound steel bars, electricians should leave people to watch it, so as to avoid damaging pipes and boxes during vibration, and changing wires, pipelines and electrical equipment without permission.

2) The dark distribution pipeline is blocked, and the pipe should be swept in time after piping. If it is found that the pipe is not aligned in time, the pipe should be plugged in time to block the nozzle tightly after piping.

5. Installation of power distribution cabinets (boxes):

(1) Requirements of materials and equipment:

According to the design requirements, all power distribution cabinets are equipped with surface and concealed equipment, and the box body should have certain mechanical strength, and the periphery should be smooth and free from damage and paint peeling. All electrical switches should be firmly installed, and the switches should be flexible, with good insulation performance, orderly wires in the box and correct wiring.

(2) Installation of concealed distribution box:

According to the design requirements, the installation position and reserved hole size of each distribution box should meet the design and specification requirements.

according to the reserved hole size, first find the elevation and horizontal dimensions of the box body and fix the box body, then fill the periphery with cement mortar and smooth it, and then install the disk surface and stick the face after the cement mortar solidifies. If the bottom of the box is flush with the outer wall, the wall plastering should be done after the metal mesh is fixed on the outer wall, and plastering should not be done on the bottom plate of the box. The installation disk surface should be flat, the peripheral clearance should be even and symmetrical, the veneer should be flat and not skewed, and the screws should be uniformly stressed vertically.

(3) process flow:

installation requirements of distribution box → elastic line positioning → fixed box → insulation shaking test.

(4) Installation of floor-mounted power distribution cabinets:

22 low-voltage cabinets are installed in the low-voltage power distribution room of this project. The installation is firm, and the cabinets are closely connected without obvious gaps. The vertical error is not more than 1.5mm per meter, and the horizontal water is not more than 1mm per meter by mistake, and the total error is not more than 5 mm. The connection of cabinets should be straight and tidy.

when the cable is introduced into the cable trench, it should be introduced from the longitudinal direction of the cable trench in day time to avoid the cable bending radius being too small.

the installation method of the foundation base of the low-voltage cabinet should refer to the standard atlas JD1-117.

the grounding of the power distribution room should be introduced from the outside, using VV22-1kV-1×25, and the single-core copper cable is introduced from the 6th axis and led to the cable rack to the low-voltage power distribution room. And one of its steel core cables, VV22-1kV-1×25, is separately led from the strong electric well to the low-voltage distribution room to ensure working grounding.

according to the design requirements, TMY-3×(8×6)+2×(5×5) aluminum bus should be installed at the top of the distribution cabinet, and the trolley insulator WX-1 should be used as the bus support.

6. threading in the pipe:

(1) material requirements:

the specifications and models of insulated wires must meet the design requirements and have the factory certificate.

mouth guard: the mouth guard with corresponding specifications should be selected according to the pipe diameter

spiral connection cap: the insulating spiral connection cap with corresponding model should be selected according to the cross-sectional area of copper conductor and the number of conductors.

terminal: the terminal with corresponding specifications should be selected according to the number of wires and the total cross section.

(2) Process flow:

Select the conductor → thread the strip line → sweep the tube → pay-off and break the line → bind the conductor and strip line → take the protective mouth → thread → conductor joint → joint binding → line inspection and insulation shaking test.

(3) Binding of wires and strip lines:

When the number of wires is small, the insulation layer at the front end of the wires can be cut off, and then the wire core can be directly inserted into the coil of the strip line and folded back for compaction, and the binding is firm, so that a smooth conical transition part can be formed at the binding place.

when the number of wires is large, or when the cross section of wires is large, the insulation layer at the front end of wires can be cut off, and then the wire cores can be obliquely inserted and arranged on the belt line, and the wire cores can be tied tightly with binding to facilitate threading.

(4) threading in the pipe:

Before threading, first check whether the mouth guards of each nozzle are complete, and if there are any omissions, they should be filled in.

when threading, two people should cooperate and coordinate, and the wires of the same AC circuit must be threaded in the same pipe. The wires of different circuits, AC and DC with different voltages shall not be threaded in the same pipe, and the total number of wires in the pipe shall not exceed 8 (referring to the same circuit). The wires passing through the pipe shall have no joints, insulation damage and dead bending, and the total cross section of the wires shall not exceed 4% of the area inside the pipe.

(5) Connection of steel wires in the junction box:

Single-core wires are connected in parallel, and the insulation platform of the wires is completely closed. At a distance of about 12mm from the insulation platform, one of the wires is wound at its connection end for 5-7 times and then cut, and the remaining ends are expressed and folded back to press on the winding wire for tin rinsing treatment.

(6) insulated spiral connection buttons. When connecting single-core copper wires of 6mm2 and below with the connection buttons, after stripping the insulation of the wires, align the exposed wire cores clockwise when connecting them, cut off the front end at 12mm of the wire cores, and then select the corresponding connection buttons to tighten them clockwise. Screw the insulated part of the wire into the upper sheath of the wiring knob.

(7) Line inspection and insulation shaking test:

After the connection, welding and wrapping are all completed, self-inspection and mutual inspection shall be conducted to check whether the wire connection, welding and wrapping meet the requirements of construction acceptance specifications and quality verification standards. Shake the test after inspection.

use a 5V megohmmeter with a range of -5MW to shake the insulation resistance. When shaking, separate the wires in the lamp holder box and connect the wires in the switch box. When shaking, separate the main line from the branch line, and the shaking speed is about 12r/mim. The reading should be after 1mim.

requirements: the insulation resistance of lighting circuit shall not be less than .5MW, and that of power circuit shall not be less than 1MW.

the sections of all grounding (neutral) wires in this project should meet the requirements of design and specifications, and the colors of the wires used should meet the requirements. Multi-strand soft copper wire should be rinsed evenly and cleanly. Wiring should use qualified products with certificates.

7. Installation of sockets and switches:

(1) Material requirements:

The specifications and models of all switches and sockets in this project must meet the design requirements and have product certificates.

1) switch installation, all switch wiring, switch cut-off position in the same place should be consistent, the operation should be flexible, the contact contact is reliable, the phase line is controlled by the switch, the switch is 15-2mm away from the door, the switch installation height is 1.4mm, the switch panel should be straight and tight, and it should be level with the wall, and the switch position should correspond to the lamp position. The switch heights installed in rows in the same indoor switch direction should be consistent, and the height difference should not be greater than 2mm according to the specification requirements.

2) Socket installation: All sockets are of safety type of more than 1A according to the design requirements, and the installation height is .3m from the ground. The leakage action time of all socket circuits is .1S, and all sockets are wired, facing the right pole of the socket, the left pole is connected to the zero line (N), and the single-phase three-hole and three-phase four-hole grounding (N). It is advisable that the distance between the strong current socket and the weak current socket is more than 5mm.

the height difference of sockets installed in the same room should not be greater than 5mm, and the height difference of rows should not be greater than mm. The concealed sockets should have special boxes, and the cover plates should be straight and tight and flush with the wall.

8. Grounding protection and lightning protection grounding:

(1) Material requirements:

According to the design requirements, the grounding protection line of this project adopts VV22-1×25mm2 and galvanized flat steel-4× 4, especially the ground protection line is laid along the cable bridge on the first and second floors underground, and the metal shells of all power equipment are connected with protection lines. The specific method is 92DQ13.

(2) Laying of grounding protection line:

In this project, the grounding protection line is laid from the outdoor grounding electrode, led through the wall and laid along the bridge, and led to the wiring board in the strong electric well with VV22-1×25mm2.

(3) Lightning protection grounding system:

The grounding system of this project is installed and laid. The galvanized flat steel of -4×4 is buried at -8 places outdoors, which is connected with the main reinforcement in the column in the main building. It is buried outdoors along the periphery of the main building. Each room is isolated by 5m as the grounding electrode, and the galvanized steel pipe L=25 is used. 5。 See JD1-113 for details.

two lightning protection downlead wires are used in the wall? 16' s main reinforcement is welded as a whole, and welded with the foundation slab reinforcement. At the underground floor -1m, the number 1.2-8, 9, 1, 11, -15, and 16 in the figure leads out the flat steel -25×3 to be connected with 1×1' s steel plate, and the grounding resistance is required to be no more than 1W.

in the drawing, the outer sides of No.2, No.82 and No.162 are taken as test points at a distance of .5m from the ground, and 1×1 steel plates are led out at-－6.2m from No.2, No.3 and No.182 as the lead-out points for grounding wires leading to the power distribution room and cable shaft.

-4×4 galvanized flat steel shall be used for the grounding wire in the cable trench from the outer leading-out points of columns 2, 3 and 18 to the distribution room, and it shall be laid on the indoor floor at -6.2m, and the welding points shall be treated with anti-corrosion. According to the design requirements, the grounding resistance shall not be greater than 1W.

from the outer leading point of the 18th column to the grounding protection line of weak current well and strong current well, the galvanized flat steel -4×4 is used and laid along the cable bridge. According to the design requirements, the grounding resistance is not more than 1W. See JD1-121, JD1-12 and JD1-12 for details.