【正文】 ................................................................................. 28 降水井的布置 ..................................................................................................................................................................... 28 觀測孔的布置 ..................................................................................................................................................................... 28 降水井施工 ......................................................................................................................................................................... 28 降水井的形式和設(shè)計要求 ...................................................................................................................................... 28 降水井施工工藝流程 ............................................................................................................................................... 29 降水井施工方法 ........................................................................................................................................................ 29 降水井質(zhì)量標(biāo)準(zhǔn) ........................................................................................................................................................ 29 基坑穩(wěn)定性分析 ................................................................................................................................................................. 30 基坑涌水量計算 ................................................................................................................................................................. 30 設(shè)計規(guī)范及依據(jù) ........................................................................................................................................................ 30 基坑涌水量 ................................................................................................................................................................ 30 降水施工 .............................................................................................................................................................................. 33 降水施工前的準(zhǔn)備工作 .......................................................................................................................................... 33 降水施工技術(shù)措施 ................................................................................................................................................... 33 深圳市 地鐵 7號線 BT 項目 73042標(biāo)項目經(jīng)理部 主體基坑開挖及結(jié)構(gòu)施工方案 第 2 頁，總 129 頁 降水安全運行 ..................................................................................................................................................................... 35 井管保護(hù) ..................................................................................................................................................................... 35 電路系統(tǒng) ..................................................................................................................................................................... 35 排水系統(tǒng) ..................................................................................................................................................................... 36 降水監(jiān)測施工 ..................................................................................................................................................................... 36 地下水位觀測孔施工 ............................................................................................................................................... 36 地下水位的監(jiān)測 ........................................................................................................................................................ 36 其它項目監(jiān)測 ............................................................................................................................................................ 36 封井方案 ............................................................................................................................................................................ 37 封井總體方案 .......................................................................................................................................................... 37 降水井封堵施工方法 ............................................................................................................................................ 37 施工質(zhì)量控制要點 ................................................................................................................................................. 38 基坑降水對周圍環(huán)境的影響及防治辦法 .................................................................................................................. 38 降水施工對周圍環(huán)境影響的類型 ....................................................................................................................... 38 降水施工對周圍環(huán)境影響的防治辦法 .............................................................................................................. 38 7 基坑周邊土體加固措施 .......................................................................................................................................................... 40 旋噴樁孔位布置 ................................................................................................................................................................. 40 旋噴樁施工方法及工藝 ................................................................................................................................................... 40 施工工藝流程 ............................................................................................................................................................ 40 測量放樣 ..................................................................................................................................................................... 41 試樁及確定工藝參數(shù) ..........................................................