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建筑工程中经常发现一些楼板裂缝是顺筋开裂、一部分裂缝进行修复开槽时发现是线管埋设问题如多重管重叠、管线未固定于上下皮钢筋当中造成上下偏位导致的混凝土开裂、另外相当一部分是由于钢筋保护层厚度偏大或不够而导致的混凝土开裂,既存在于楼板面层也存在于天棚处。同时,钢筋在楼面混凝土板中的抗拉受力,起着抵抗外荷载所产生的弯矩和防止砼收缩和温差裂缝发生的双重作用,即使是由于温度应力导致产生的45度板角斜裂缝,设计方案往往布置了放射筋,但从实际效果看也是差异很大。因此楼板裂缝的产生无论从受力角度来分析,还是从通过一定施工措施降低变形作用引起的楼板裂缝方面来看,都反映出与钢筋工程有着相当的关联度。
Often found in the construction of a number of cracks in the floor slab is tendon cracking, part of the cracks were repaired Slotted tube found that the problems such as the laying of pipe overlap, the pipeline is not fixed in the upper and lower steel bars caused by the upper and lower deviation of concrete cracking, the other is quite Part of the concrete cracking is due to the over or under thickness of the steel reinforcement, both in the floor finish and in the ceiling. At the same time, the tensile strength of reinforced concrete slabs in the floor plays a dual role in resisting the bending moment caused by external loads and preventing the concrete shrinkage and temperature difference cracks. Even if the angle is 45 degrees due to temperature stress Cracks, design programs are often arranged radioactive ribs, but the actual effect is also very different. Therefore, the cracks in the slab are not only analyzed from the force point of view, but also from the point of view of the cracks in the slab caused by the deformation caused by certain construction measures.