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模板工程施工方案五 | 2011-1-19 2:15:00
现场安全资料实例(153)模板工程施工方案五
模板工程施工方案五
模板工程施工方案 五、模板强度验算 1. 模板侧压力计算 混凝土作用于模板的侧压力,一般随混凝土的浇筑高度增加,当浇筑高度达到某一临界值时,侧压力就不再增加,此时的侧压力即为新浇筑混凝土的最大侧压力。侧压力达到最大值的浇筑高度称为混凝土的有效压头。 采用内部振捣器时,新浇筑的混凝土作用于模板的最大侧压力,可按下列两式计算,并取两式中的较小值。
式中 F ——新浇筑混凝土对模板的最大侧压力(kN/m2); γc ——混凝土的重力密度(kN/m3); t0 ——新浇混凝土的初凝时间(h)可按实测确定,当缺乏试验资料时,可采用t0=200/(T +15) 计算; T ——混凝土的温度(℃),入模温度T=20℃; v ——混凝土的浇筑速度(m/h),取v=3m/h; H ——混凝土侧压力计算位置处至新浇筑混凝土顶面的高度(m),取H=3m (墙高度为3m); β1 ——外加剂影响修正系数,不掺外加剂时取1.0;掺具有缓凝作用的外加剂时取1.2; β2 ——混凝土塌落度影响修正系数,当塌落度小于30mm时,取0.85;50~90mm时,取1.0;110~150mm时,取1.15; h ——有效压头高度(m), 由式(1)
由式(2) 按取最小值,故最大侧压力取74kN/m2。 有效压头高度
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