control measures of shallow exploration reinforced concrete building crack（1）
1. Design
1.1 to reduce the uneven settlement of foundation, adjust the buried depth of foundation, foundation calculation strength, cushion thickness and other methods to control the uneven deformation of foundation.On the same weak soil foundation, the same type of foundation should be used as much as possible, otherwise it is easy to cause uneven settlement amount, thus causing harmful cracks.
1.2 set up structural joints reasonably. The location and width of structural joints shall be selected appropriately and the structure shall be reasonable.Expansion joints, settlement joints and seismic joints can be sewn and set.Considering the high temperature, winter, long-term exposure to the atmosphere of the building, withstand repeated temperature difference, repeated wet and dry effect, the internal structure continues to produce cracks and crack expansion and other factors.Effective anti-cracking measures should be taken when the structure body changes suddenly or the expansion joint spacing is too large to meet the specification requirements.
1.3 avoid stress concentration, reasonably increase the construction of steel bars to improve crack resistance, and try to avoid sudden changes in the structural section to produce stress concentration. Strengthen measures should be taken in weak links prone to stress concentration, and appropriate additional reinforcement should be added to enhance crack resistance.Designers should pay attention to the configuration of structural rebar and choose the diameter and quantity of structural rebar appropriately.From the point of view of design, structural reinforcement is very important, and structural design often ignores the structural constraint property, so as to produce structural cracks.
1.4 increase the thickness of the protective layer. Appropriately increase the thickness of the protective layer can improve the quality and compactness of the protective layer, reduce its permeability, prevent or delay the carbonization rate of concrete, and improve the splitting strength.Thick protective layer of underground structure, to add steel mesh;Floor to lay equipment tube, but also to increase the floor thickness.
1.5 add secondary beams to reduce cracks. In modern design, the width and length of cast-in-place slabs are getting larger and longer, while the thickness of floor slabs cannot be too large. If secondary beams are added at appropriate parts below the slabs, the rigidity of the slabs can be increased, and the deflection deformation of the slabs can be reduced, so as to avoid harmful cracks.
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