地下室外墙裂缝预估与控制

以国内外已取得的钢筋混凝土裂缝控制，特别是地下室外墙裂缝控制理论为基础，通过对钢筋混凝土地下室外墙的调查分析，考虑水平筋、拆模时间、钢筋外形、约束条件、养护、泵送商品混凝土特点、表层素混凝土厚度及截面特征的影响，提出预估地下室外墙裂缝发生的经验公式及控制系数。实践证明，该公式较好地吻合了施工现场的情况，有一定的规律性。

FORECAST AND CONTROL OF BASEMENT EXTERIOR WALL CRACKS

Based on the crack control of reinforced concrete accomplished at home and abroad, in particular, the crack control theory of basement exterior wall, through investigation and analysis on reinforced concrete basement exterior wall,empiric formula and control coefficient are put forward for forecasting cracks in the wall, taking into account the effects caused by horizontal bar, time of form dismantling, shape of steel bar, restraint condition, concrete curing, characteristics of pumped concrete and thickness of plain concrete coat as well as features of the cross-section. Practice shows that this formula coincides with construction site conditions well, reflecting the law to a certain degree.