【正文】 注 ........................................................................................81 初灌量的確定 .............................................................................81 隔水塞 .........................................................................................82 8 施工組織設計 測繩的選擇和校核 .....................................................................82 混凝土灌注 .................................................................................82 護筒起拔 .....................................................................................83 孔口防護 .....................................................................................83 導管及護筒沖洗 .........................................................................83 樁頭截除及高應變樁帽制作 ...................................................................83 樁頭截除 ............................................................................................83 高應變樁帽制作 ................................................................................84 第七章 PHC 管 樁施工方案和措施 ............................... 85 施工工藝流程 ...............................................................................................85 施工質量控制要點及控制方法 ...................................................................86 PHC 管樁質量驗收及堆放 ..........................................................................86 管樁驗收 ..................................................................................................86 管樁外觀質量驗收標準 ..........................................................................87 預制鋼筋混凝土樁的裝卸與堆放 ..........................................................88 4．管樁施工 .......................................................................................................89 技術要求 ...................................................................................................89 測量放線 ..................................................................................................89 打樁順序 ...................................................................................................90 各工序施工方法 .......................................................................................90 打樁設備就位 ....................................................................................90 底 樁就位、對中與調直 ....................................................................91 錘擊沉樁 ............................................................................................92 接樁 ...................................................................................................93 接樁方法 .....................................................................................93 焊接前準備工作 .........................................................................93 管樁焊接要求 .............................................................................94 9 施工組織設計 PHC 管樁焊接質量標準 ............................................................95 管樁焊接的防腐措施 .........................................................95 打樁 ....................................................................................................96 停錘標準 ............................................................................................96 截樁 ....................................................................................................96 施工記錄 ............................................................................................97 質量保證措施 ..........................................................................................97 超孔隙水壓力消散措施 ....................................................................97 防止樁位偏移的質量保證措施 .......................................................98 焊接質量保證措施 ...........................................................................99 防止樁頭破碎、樁身疲勞的技術措施 ............................................99 第八章 干法振擠碎石樁施工方案和措施 ........................ 101 施工工藝流程 .............................................................................................101 施工質量控制要點及控制方法 .................................................................101 施工準備 .....................................................................................................102 清障及場地平整 .....................................................................................102 施工 控制及軸線測設 .............................................................................102 樁位定位 .................................................................................................102 設備安裝和調試 .....................................................................................103 就位及對中 .............................................................................................103 施工記錄 .................................................................................................103 干法振擠碎石樁質量控制要求 .............................................................103 施工過程 .....................................................................................................103 成樁過程控制 ........................................................................................103 成樁后檢驗 .............................................................................................104 第九章 施工中易發(fā)生的問題和防治措施及雨季施工措 施 ........... 106 10 施工組織設計 施工中易發(fā)生的問題及防治措施 .............................................................106 鉆孔灌注樁施工 ....................................................................................106 孔壁坍陷 ..........................................................................................106 縮徑 .................................................................................................106 樁底沉渣量過多 .............................................................................107 鉆孔偏斜 ..........................