Reinforced concrete floor according to their different construction methods, can be divided into cast-in-situ, assembly and assembly of the whole three.
Cast-in-place reinforced concrete floor
First: The advantages and disadvantages of reinforced concrete floor:
1. Features: One-time overall pouring
2. Advantages: the overall good earthquake, waterproof, easy to facilitate the pipeline through the room, the size does not match the modulus of the room, the irregular shape of the room.
3. Disadvantages: long duration, significantly affected by the season, a large amount of template, labor-intensive, low labor efficiency.
Second: reinforced concrete floor type
1, flat floor
According to the characteristics of the floor and supporting the situation, divided into one-way board and two-way board. In order to meet the construction requirements and economic requirements, the minimum thickness and maximum thickness of various slab floor, the general provisions are as follows:
(1) One way plate (ratio of long to short sides of plate> 2):
Roof thickness 60mm ~ 80mm;
Civil building floor thickness 70mm ~ 100mm;
Industrial building floor thickness 80mm ~ 180mm;
(2) two-way board (board long side and short side ratio ≤ 2): thickness of 80mm-160mm;
Further, the support plate of predetermined length: When the plate is supported on a masonry wall, which supports the thickness or length not less than 120mm; when the plate is supported on the reinforced concrete beam, which supports a length not less than 60mm; when supported on the steel plate Beam or steel roof frame, the support length of not less than 50mm.
2, ribs floor
(1) Unidirectional rib floor [Unidirectional rib floor layout, unidirectional rib floor perspective]
The unidirectional rib slab consists of slab, secondary beam and main beam. The load transfer route for the plate → secondary beam → main beam → column (or wall). The economic span of the main girder is 5 ~ 8m, the main girder height is 1/14 ~ 1/8 of the span of the main girder, the main girder is 1 / 3-1 / 2 of the high one, the economic span of the second girder is 4 ~ 6m, The secondary beam height is 1/18 to 1/12 of the span of the secondary beam and the width is 1/3 to 1/2 of the beam height, and the span of the secondary beam is the spacing of the main beam; the thickness of the slab is determined to be the same as that of the slab-type slab, The amount of about 50% ~ 70% of the total amount of concrete slab ribs, so the board should take a thin, usually no more than 3m across the board; its economic span of 1.7 ~ 2.5m.
(2) Two-way ribbed floor (well floor) [Pit floor perspective]
The two-way ribbed floor slab is often not divided into primary and secondary beams, which consist of slabs and beams. The load transfer path is slab → beam → column (or wall).
When the two-way ribbed slab floor across the same, and the two directions of the beam section is the same, it formed a well-type floor. Shaft floor is suitable for rectangular plane with aspect ratio less than 1.5. The floor of well floor slab span 3.5 ~ 6m, the span of beam up to 20 ~ 30m, the beam section height is not less than 1/15 of the beam span, Width of beam height 1/4 ~ 1/2, and not less than 120mm. Pit floor can be placed perpendicular to the wall or placed obliquely. Because of the well-type floor can be used for larger column-free space, and the floor at the bottom of the well grid uniform, very rhythmic, a little treatment can form a good art roof.
3, no beam floor [beamless floor perspective]
Beamless floor slab for the same thickness directly on the column, there are two kinds of column cap and no cap. When the floor load is relatively small, can be used without cap floor; when the floor load is larger, the cap must be added column cap. The columns without beam floor can be designed as square, rectangle, polygon and circle. The column cap can be designed according to the requirements of indoor space and column cross section. The minimum thickness of the plate is not less than 150mm and not less than 1 / 35-1 / 32. Non-beam floor column network is generally arranged square or rectangular, span generally not more than 6m.
4, pressure plate combination floor
Compression plate composite floor is the use of cross-section of the corrugated plate made of steel plate and cast-in-place concrete pouring together on the steel beam to become a very strong overall floor [Figure].
