The neighbor was ready to build the house, but he didn't want to find those outside engineering teams to do it, so he called a few brothers in his village to help, but when the house was finished with floor slabs, there was a problem. Because it was not known whether the cast-in-place slab was double-layer or single-layered, the project was stopped for a while.
The cast-in-place slab is generally cast with concrete, so the steel bar should be paved in advance, and the bearing capacity and stability should be good.
In the place of the negative moment of the floor slab, it is necessary to use double-layer steel bars, and generally where there are beams, a certain negative moment is also used, so it must be double-layered.
Some places are easily affected by temperature differences, so it is generally safer to use double-layer steel bars in such places, such as ceilings. For some more complex yin and yang angle positions, certain shockproof measures should be taken, so two layers of steel bars should be used.
Because the floor slab itself has a certain mobile live load and a certain control effect, it is necessary to use double-layer steel bars when selecting a certain place with a high recurrence rate. In addition to the above cases, other places are generally used with a single layer of steel bar.