When laying double-layer steel mesh for different types of building structures, there are certain differences in the steel mesh spacing standards. The following is a detailed introduction for you
Slab structure
General concrete slab: According to the "Concrete Structure Design Code", when the slab thickness is not more than 150mm, the steel bar spacing should not be greater than 200mm; when the slab thickness is greater than 150mm, the steel bar spacing should not be greater than 1.5 times the slab thickness, and should not be greater than 250mm.
Residential roof panels: For multi-story residential roof panels, when the roof panels are at the corners of the house and the span ≥3.9m, double-layer bidirectional continuous steel bars should be set. The steel bar spacing at the corners should not be greater than 100mm, and the steel bar spacing of the floor slab with a span of ≥3.9m should not be greater than 150mm. The steel bar diameter should not be less than φ8.
Highway cement concrete pavement: When cold-rolled ribbed steel bars are used, the steel bar diameter should not be less than 8mm, the longitudinal steel bar spacing should not be greater than 200mm, and the transverse steel bar spacing should not be greater than 300mm.
Column structure
Rectangular column: The horizontal spacing should not be greater than 200mm, and the vertical spacing should not be greater than 300mm.
Circular column: The horizontal spacing should not be greater than 150mm, and the vertical spacing should not be greater than 200mm.
Wall structure
General wall: Usually the horizontal and vertical steel bars are spaced about 150-300mm, which is determined according to the stress conditions, height, thickness, etc. of the wall. For example, the spacing of the steel bars in the filling walls of some buildings may be larger; while for the shear walls under stress, the spacing of the steel bars will be relatively small to ensure the shear and bending resistance of the wall.
Hydraulic structure wall: Due to the high requirements for waterproofing and anti-seepage, the spacing of the steel bars is usually small and the arrangement is dense. Generally, the horizontal and vertical steel bars are spaced 100-200mm to improve the crack resistance and anti-seepage of the concrete and prevent water leakage.
Beam structure
For general beams, the longitudinal steel bar clearance shall not be less than 30mm at the top and 25mm at the bottom, and shall not be less than the steel bar diameter. The upper row clearance at the bottom shall not be less than twice the lower row clearance, and the upper and lower rows clearance shall not be less than 25mm. When the beam bears a large load or has special requirements, the steel bar spacing may be appropriately adjusted according to the calculation, but it must meet the minimum spacing required by the specification to ensure that the steel bar and concrete work together and facilitate the pouring and vibration of the concrete.
Long-span structures and high-rise buildings
Long-span structures: such as long-span bridges and gymnasium roofs, in order to ensure the safety of the structure under large loads and deformations, the steel mesh spacing is usually small and the steel bars are densely configured, generally between 100-200mm, which is determined by structural calculation according to the span size, load type, etc.
High-rise buildings: The loads borne by its foundations, columns, walls, beams and other structural components are large, and there are strict requirements for the steel mesh spacing. For example, the spacing of steel bars in the foundation raft of a high-rise building is generally 150-250mm; the spacing of steel bars in shear walls is usually 150-300mm; the spacing of steel bars in frame columns and beams is similar to that in ordinary buildings, but may be denser in some key parts to improve the seismic performance and bearing capacity of the structure.
It should be noted that the above steel mesh spacing standards are only for reference. The determination of the steel mesh spacing in actual projects needs to be determined by professional structural engineers based on the specific project conditions, following relevant design specifications and standards, and through rigorous calculation and analysis.
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