1. Setting-out of decoration measurement

1. Before construction, construction technicians and lofting personnel shall conduct field measurement and lofting, mark out the position of decorations with ink lines on the spot according to the design drawings, and check whether there is any error between the site and the drawings before construction.

2. Layout elevation lines of 51cm on each level, and pop up chalk lines on the wall as the standard benchmark for interior decoration, with a measurement error of 3 mm..

3. Steel nails are used as setting-out confirmation points for the ground setting-out points, and the top surface of the wall is marked with paint.

II. Electrical construction

1. Indoor power distribution

(1) The rated voltage of the conductor shall be greater than the working voltage of the line, and the insulation strength of the conductor shall conform to the laying mode and environment of the line. The cross-sectional area of the conductor should meet the requirements of power supply quality and mechanical strength.

(2) When laying wires, try to avoid joints. If joint is necessary, try to press or weld.

(3) Conductor connections and branches shall not be subjected to mechanical action. Wires should be firmly connected to equipment terminals.

(4) Wires or cables passing through the pipe should not be connected under any circumstances. If it is necessary to connect, the connectors can be placed in the junction box, lamp holder box and switch box.

(5) All kinds of exposed wiring should be horizontal and vertical.

(6) When the conductor goes through the wall, a protective tube is added, and the two ends of the wall-crossing tube are not less than 11mm, which will affect the appearance.

(7) When the wires cross each other and are close, a plastic pipe should be put on each wire and the sleeve should be fixed to prevent short circuit.

(8) A certain distance, not less than 111mm, should be kept between indoor electrical wires and other pipes.

2. Construction procedure

(1) According to the floor plan and detailed drawings, determine the electrical installation position, the laying path of the conductor and the position where the conductor passes through the wall and floor.

(2) Decorate insulation supports, clamps, brackets or protective tubes.

(3) laying wires.

(4) Install lamps and electrical equipment and components.

(5) Test the insulation of wires and connect them.

(6) Check and test the power supply.

3. Installation of lamps

(1) Before installation of lamps, check whether the accessories are complete, whether the appearance is damaged, deformed and the coating falls off, and test whether the insulation is good.

(2) The installation position and height of lamps should meet the design requirements.

(3) Lamps with a weight of less than 1kg can be hoisted directly with flexible cords; lamps with a weight of more than 1kg should be hoisted with chain slings; lamps with a weight of more than 3kg should be fixed on embedded hooks or bolts.

(4) There shall be at least two bolts for fixing lamps.

(5) When the lamps and lanterns are installed in flammable parts, fire prevention treatment should be done well, and fire retardant coatings should be painted on the surrounding structures.

(6) When there are multiple sets of lamps in the same room, they should be arranged neatly and meet the design requirements, and the lamp lines should be unified, and the size adjustment plate should be added if necessary.

4. Socket installation

(1) When sockets in the same place are installed in rows, the height difference should not be greater than 1mm, and when they are installed separately, the height difference should not be greater than 5mm

(2) The height of concealed sockets is 1.3m from the ground.

(3) When wiring the socket, the conductor color separation should be unified and correct, and the right pole of the socket should be connected to the phase line, the left pole to the zero line, and the grounding line should be above.

5. The installation of lighting distribution box should meet the design requirements.

(1) Insulated tubes should be set at the lead-out board.

(2) The vertical deviation of the distribution box should not be less than 1.5/1111. The edges around the panel of the concealed distribution box should be close to the wall.

(3) Each loop has a signboard indicating the name and purpose of the loop. If there are different types or different voltage levels of distribution equipment installed in the same box, there should be obvious distinguishing signs.

(4) The installation height of the distribution box should be between 1.2m and 1.5m, and the working zero line and protective grounding line in the box should be strictly distinguished.

(5) The internal wiring section of the distribution box should meet the specification requirements.

III. Lightweight steel keel gypsum board ceiling

1. The ceiling base must have sufficient strength. Clear the ceiling and surrounding obstacles. Concealed works such as ventilation, water and electricity pipelines in the ceiling should be installed, and the fire protection system should be installed and pressure tested. Suspended ceiling keel shall not be thrown or collided during installation and transportation. Keels should be laid flat to prevent deformation. The surface should be smooth, the edges should be neat, and the color should be uniform.

2. According to the ceiling design elevation, the elastic line around the wall is used as the standard line for ceiling installation, and its horizontal allowable deviation is within 5 mm, and the installation position of the edge keel is determined, and the edge keel is fixed on the surrounding wall.

3. Draw the top position line of the suspender on the ceiling, find out the symmetrical crosshairs on the ceiling, draw several intersecting lines according to the frame size of the ceiling keel, and use the internal expansion bolts to fix the suspender firmly on the ceiling. The suspender adopts No.8 full bolt pattern suspender, and the spacing between suspenders is less than 1211mm. When the derrick meets the top equipment and pipeline, the position of the lifting point should be adjusted and the derrick should be added.

4. Fix the hanger below the derrick, and pull the wire according to the height of the side keel, and recheck and adjust the height of the derrick to a suitable position.

5. Place one end of the bearing keel on the edge keel, hang the bearing keel with a hanger and fix it with screws. The load-bearing keel is connected, and the main keel connector is used to connect and lengthen. The bearing main keel spacing is generally 911—1211mm, and the middle part should be bulging, and the bulging height should not be less than 1/211 of the short side span of the room. After the main keel is installed, its position and elevation should be corrected in time. Light lamps and lanterns should be hung on the main keel or additional keel, and heavy lamps and lanterns or other decorative parts should not be connected with the ceiling keel, and a hook should be set up separately.

6. Fully correct the position and levelness of primary and secondary keels, and screw and clamp all hangers and connectors after correction. Connectors should be installed in a staggered manner.

7. When installing various pipelines, the keel system shall not be destroyed or directly erected on the keel. After the pipeline is accepted, the cladding plate can be installed.

8. There should be no bubbles, peeling, cracks, pollution and incomplete patterns on the panel.

9. Gypsum board shall be installed along one end of the ceiling. The long side of gypsum board shall be installed vertically with the facing keel, and the flat-fell seam of short side of gypsum board shall be staggered, and no straight seam shall be formed.

11. Fix the board surface and keel with gypsum board tapping screws; Self-tapping screws should be driven by electric screw gun at one time, and the nail head should be embedded in gypsum board for 1.5mm—1mm-1 mm, so that the paper surface should not be damaged and gypsum should be exposed. Self-tapping screws should be installed along the edge of cladding, and the distance between self-tapping screws and plate edge should be 11 mm-15 mm, and the distance between self-tapping screws and plate edge should be 15 mm-21 mm and the screw spacing should be 151 mm-171 mm.. The connection between gypsum board and keel should be fixed from the middle of the board to all sides, and multi-point simultaneous operation is not allowed to avoid uneven stress laying. Paint the nail head with antirust paint and smooth it with caulking paste.

11. Joint treatment: clean the board joints and remove sundries. Fill the caulking paste into the joint of the plate, press it tightly, and the thickness is flat with the plate, and it shall not be higher. After it is cured, apply caulking paste on both sides of the joint, each side is not less than 51mm, stick the joint tape on the joint, and scrape it with a spatula for compaction, and there shall be no bubbles between the paper tape and caulking paste. Make the midline of the paper tape coincide with the midline of the board seam, and the width of the paper tape is equal on both sides of the seam. Scrape the sealing paste pressed from the edge of the paper tape on the paper tape, smooth it and compact it, so that the paper tape is buried in the sealing putty.