【正文】 哈爾巴嶺 特大橋簡支箱梁鋼管立柱單層貝雷梁支撐現(xiàn)澆專項施 工技術(shù)方案 I、 工程概況 ............................................................................................... 1 二、施工總體布置 ........................................................................................ 1 施工總體方案 ...................................................................................... 1 施工進度安排 ...................................................................................... 2 組織機構(gòu)安排 ...................................................................................... 3 材料與機械設(shè)備配備 ........................................................................... 3 施工場地布置 ...................................................................................... 4 三、貝雷支架拼裝 ........................................................................................ 4 單層貝雷支架布 置圖 ........................................................................... 4 貝雷架拼裝 .......................................................................................... 6 鋼管立柱安裝 ................................................................................ 7 安裝砂筒 ....................................................................................... 9 工字鋼橫梁安裝 ............................................................................ 9 貝雷架安裝 ................................................................................. 10 貝雷架的加固 .............................................................................. 10 模板安裝 ............................................................................................ 10 四、模板及支架預(yù)壓 .................................................................................. 11 預(yù)壓目的 .............................................................................................11 方法概述 .............................................................................................11 預(yù)壓前的檢查 .................................................................................... 12 哈爾巴嶺 特大橋簡支箱梁鋼管立柱單層貝雷梁支撐現(xiàn)澆專項施 工技術(shù)方案 II 沉降觀測點的設(shè)置 ............................................................................. 12 沉降觀測 ............................................................................................ 13 加載方案及加載程序 ......................................................................... 14 五、 鋼筋工程 .............................................................................................. 16 鋼筋加工、綁扎安裝 ......................................................................... 16 鋼筋的驗收 ........................................................................................ 16 各種預(yù)埋件、預(yù)留孔洞 ..................................................................... 17 伸縮縫預(yù)埋件 ............................................................................. 17 擋碴墻、電纜碴、遮板預(yù)埋筋 .................................................... 18 接觸網(wǎng)下錨支柱預(yù)埋件 ............................................................... 18 預(yù)留孔施工 ........................................................................................ 18 六、梁體砼施工 .......................................................................................... 19 砼的泵送 ........................................................................................... 19 砼的灌注 ........................................................................................... 19 梁體砼的養(yǎng)護及拆模 ......................................................................... 21 七、預(yù)應(yīng)力施工 .......................................................................................... 21 技術(shù)要求 ........................................................................................... 21 預(yù)應(yīng)力材料的保護： ......................................................................... 22 張拉準(zhǔn)備條件 .................................................................................... 23 施工工藝 ............................................................................................ 23 后張梁穿束張拉 .......................................................................... 23 哈爾巴嶺 特大橋簡支箱梁鋼管立柱單層貝雷梁支撐現(xiàn)澆專項施 工技術(shù)方案 III 穿束 ..............................................................