Beam and slab are composed of slab, secondary beam and main beam, which are rammed into a whole and are suitable for long-span workshops, but the beam body occupies a certain space.

Floor can be divided into one-way slab, two-way slab and cantilever slab. Veneer (the ratio of long and short sides is greater than or equal to 3, supported by four sides) is only stressed on the short side; Two-way slab (the ratio of long and short sides is less than 2, supported by four sides) is stressed in two directions, and steel bars are arranged in two directions. When the ratio of long and short sides is greater than or equal to 2 and less than 3, it is generally designed as a two-way plate; Cantilever plate has only one support, negative reinforcement is placed above the plate, and distributed reinforcement is placed below the plate. Plate thickness 1/35, root not less than 80.

Beam-slab multi-ribbed floor is composed of main beam, secondary beam and floor; It has the characteristics of clear force transmission line and reasonable force. The economic span is 5-8m; The secondary beam is perpendicular to the main beam, and the swallow transfers the load to the main beam; When laying beams and slabs on the wall, the laying length specified in the specification shall be met: the laying length of slabs shall not be less than 120, the laying length of beams on the wall shall be related to the beam height, and shall be less than or equal to 500, and the laying length shall not be less than180 mm; ; Beam height is more than 500mm, laying length is not less than 240mm；; Usually, the length of the secondary beam is 240mm and the length of the main beam is 370mm；;