by Click the blue word to pay attention to the construction methods of our floor engineering, mainly including cast-in-situ reinforced concrete floor slab and precast floor slab.
The specific construction methods are as follows: 1.
Cast in situ reinforced concrete floor slab: cast in situ reinforced concrete floor slab refers to the floor slab made by formwork erection, reinforcement binding, concrete pouring, curing and formwork removal according to the design position on site.
Construction process flow: setting out, formwork erection and installation, fabrication and binding of dowel bars, concrete pouring, concrete curing, formwork removal and completion cleaning.
Precautions: 1) the formwork can be removed only when the strength of concrete with a span of more than 8m is ≥ 100%, and that of concrete with a span of 8m and less is ≥ 75%; When the concrete strength is ≥ 1.2MPa, people and construction can be carried out on the floor.
(generally, the strength can reach ≥ 1.2MPa 24 hours after pouring, 7 ~ 9 days under normal maintenance in spring, summer and autumn, and 10 ~ 15 days under normal maintenance in winter).
2) Under normal maintenance, it shall not be less than twice a day; Ensure that there is 11 ~ 16 minutes of ponding on the floor each time.
3) The moisturizing maintenance of concrete is very important for its strength growth and the improvement of various properties.
In particular, proper early maintenance can avoid surface dehydration and greatly reduce the occurrence of expansion cracks in the initial stage of concrete.
Therefore, the necessary maintenance (generally ≥ 24 hours) after the floor concrete pouring must be guaranteed.
For example, in the actual construction, the snapping line and the operation of construction personnel will be affected due to the rush for the construction period and watering.
During the construction, the gunny bag or straw bag must be covered for proper moisture conservation maintenance for about one week.
4) The formwork can be removed when the floor strength reaches 75%.
2.
The precast floor slab is directly transported to the construction site for installation after being processed and formed in the factory, so it is called precast slab.
When making precast slab, firstly nail the hollow model with wood board.
After placing reinforcement on the hollow part of the model, fill the hollow part with cement, and knock off the wood board after drying.
The rest is precast slab.
Note: the dimensions of precast slab include the following contents: 1 Span: the longest for residential use is 4.2m, regardless of modulus, which exceeds the need for customization.
2.
Width: more than 500mm and 600mm.
3.
Thickness: common 120mm, 150mm.
4.
Level of bearing live load: generally, two levels of plates can be used for residential buildings, that is, the first level plate and the second level plate.
The first level plate means that the live load that can be borne is 1kn / m2, and the second level plate means that the live load that can be borne is 2Kn / m2.
The southwest region has stipulated that the minimum is four grade plate, that is, the live load that can be borne is 4kn / m2.
The length is generally based on the modulus of 300mm, such as 3000, 3300, 3600, 3900 and 4200, but there are also special ones such as 3800 and 4000, but the longest ordinary plate is 4200.
The width is generally 400mm for four holes and 500mm for five holes.
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