(1) bullet line
Use level in the room (column) Angle on each wall take out point (if the wall is longer, the middle is also appropriate to copy a few points), pop-up level (level line according to the ground is usually 500 mm), from the standard line to condole carries on the design height plus 12 mm (the thickness of a layer of white bone plate), with a chalk line (column) along the wall popup level line, for suspended ceiling keel namely skin under line. At the same time, according to the ceiling plan, the position of the main keel is ejected on the concrete top plate. The main keel should be divided from the center of the ceiling to the two sides, the maximum spacing is 1000mm, and the fixed point of the derrick is marked, the fixed point distance of the boom is 900 ~ 1000mm. If the fixed point of the beam and pipe is greater than the design and procedure, the fixed point of the derrick should be increased.
(2) fixed hanger rod parts
Adopt expansion bolt to hold the hanger rod. The condole of not a person, condole length is less than 1000mm, can use the condole of phi 6, if big 1000mm, should adopt the condole of phi 8, return should set reverse support. The derrick can use cold-drawn steel bars and round steel bars, but the steel bar should be mechanically straightened. The condole of a person's condole, condole length is less than 1000mm, can use the condole of phi 8, if greater than 1000mm, should use the condole of family phi 10, return should set the reverse support. One end of the boom with L30 * 30 * 3 welding Angle code size (Angle aperture should be determined according to the boom and the diameter of the bolts), on the other side can give greater than lOOmm screw with tapping sets, also can buy finished screw welding. The well made derrick should be treated with rust prevention. The boom bolt is fixed on the floor with expansion bolts, and the aperture should be slightly larger than the diameter of the expansion bolt.
(3) hang the hanging lever on the beam
1) the hanging rod should be straight and adequate bearing capacity. When the embedded rod needs to be extended, it must be welded and welded evenly.
2) the lifting rod is not more than 300mm from the end of the main keel, otherwise the derrick should be added.
3) the ceiling lamps, vents and access ports should be attached with a derrick.