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                护筒

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                       在钻孔灌注桩中,常埋设钢护筒来定位需开元棋牌要钻的桩位。护筒为钢护筒,壁厚10mm,护筒定位时,先以桩位中心为圆心,根据护筒半径在土上定出护筒位置,护筒就位后梭哈小游戏,施加压力将▂护筒埋入约50cm。如下压百家乐网络困难,可先将孔位处的土体挖出一部分,然后安放护筒埋入中国象棋小游戏地下。在埋入过程中应检查护筒是否垂直,若发现偏斜,应及☆时纠正。陆上护筒埋放就位后,将护武将牌翻面筒外侧用粘土回填压实╱,以防止护筒四周出现漏水现象,回填厚度约40-45cm,顶端南宁同城游戏高度高出(水面)地面0.4-0.6m, 筒位距孔心偏差不得大于50mm