一、 运输洞砼工程概况
        二、 施工布置
        1、施工道路布置
        运输洞混凝土由右岸七局砂石加工及混凝土拌和系统统一供应，混凝土主要运输路线为：R1公路       永久跨江大桥      左岸坝顶上坝公路       2#交通洞     工作面 。
        2、施工用风、水、电布置
        运输洞混凝土施工用风主要为清理仓号、施工缝风镐凿毛，插筋孔打设等用风；混凝土施工用水主要有清理仓面、养护用水；混凝土施工主要有电焊机、振捣器、空压机、水泵及照明等用电。在运输洞开挖与支护工程中，已在2#交通洞2#施工支洞内布置形成2#空压站、2#变配站及3#供水管路，运输洞混凝土施工时亦用此系统。                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         
        3、辅助生产系统
          右岸七局砂石骨料拌合系统提供混凝土，6m3混凝土搅拌运输车运至施工场地。
        三、施工程序
        运输洞混凝土按如下施工程序进行施工:
        底板一次浇筑，边墙及顶拱分两段施工，分缝桩号0+015，中墩分7层施工，渐变段▽988高程以下底板混凝土→渐变段0+015～0+030边墙混凝土(单侧1次浇筑)→ 0+000～0+015中墩混凝土(分7层施工)→渐变段0+000～0+015边墙混凝土(1次浇筑)→ 渐变段0+015～0+030顶拱混凝土(分2层施工)→渐变段0+000～0+015顶拱混凝土(分2层施工)
        3.2各浇筑段按如下施工程序进行施工:
        基础处理→测量放样→清基→验收→钢筋安装→模板支立→模板验收→砼浇筑→砼养护→拆模
        5施工方法
        5.1底板混凝土施工方法
        渐变段模板采用现支模板，与岩面接触部位采用现支木模，木模找平后，采用钢模支模，模板背方为12*12cm木方，拉筋为Φ14钢筋，模板拉筋焊接在底板钢筋网上，拉筋焊接要保证足够的强度要求。
        渐变段底板一仓浇筑，从洞口向洞内方向浇筑，混凝土泵送入仓，Φ100震捣棒震捣，面层如钢筋网密集，面层采用一级配浇筑，在靠近边墙及中墩位置，铺设震动梁滑移轨道，震动梁震捣，边墙及中墩钢筋纵横交错区域，Φ70软轴震捣器震捣，终凝前人工刷毛处理施工缝。
        面层震捣完成后，混凝土初凝前，人工抹面，确保抹面质量，抹面时，用4m靠尺刮平后人工抹面，底板抹面完成后立即覆盖草帘保护并洒水养生；
        5.2中墩混凝土施工方法
        中墩采用现支模板分层浇筑，模板采用P3015、P1015标准模板，模板背方采用Φ50脚手架管弯制成型，弯制半径51.18m，3块P3015与1块P1015模板交叉拼装，竖排模板，横拉背方，背方为双根脚手架钢管，采用专用扣件与模板拉筋连接，在P1015模板中间钻拉筋孔，孔径为16mm，采用直径14mm拉筋，钻孔中心距离75cm，距离上下两端37.5cm，拉筋布置为75*100cm间排距，拉筋靠近模板侧安装锥形橡胶圈，拆模后，拆除橡胶圈，割除拉筋，同规格、标号砂浆抹平拉筋孔，每次支模高度3m，分7层浇筑，浇筑高度18.8m；详见导流洞进口渐变段中墩施工图。
        为确保接缝质量，每仓上层模板不拆除，两段设冲面排水孔，逐层测量校正后与下层预留模板连续支模，混凝土泵送入仓，Φ100震捣器震捣，两侧钢筋密集区域，Φ70软轴震捣器震捣，施工面终凝前人工刷毛处理施工缝。
        5.3边墙混凝土施工方法
        渐变段两侧边墙分两段浇筑，施工分缝位置为0+015桩号，模板采用定制G-70系列标准模板，模板规格为60*150cm（宽*高＝600*1500mm）型及1015（宽*高＝100*1500mm）型模板，横排模板，竖向布置模板背方，背方为双根脚手架钢管，采用专用扣件与模板拉筋连接，在1015模板中间钻拉筋孔，孔径为18mm，采用直径16mm拉筋，钻孔中心距离75cm，距离模板两端37.5cm，拉筋布置为75*130cm间排距，每两排60*150cm模板加一排1015模板， 1015模板中间钻拉筋孔，钻孔中心距离75cm，距离上下两端37.5cm，拉筋布置130*75cm间排距，一次支模至拱脚线下30cm，采用直径14mm拉筋，边墙施工采用分层浇筑施工，分层高度0.5m，严格控制浇筑速度，每小班浇筑高度控制在2.5m以内，随时注意模板变化，发现变形，立即停止施工，检查模板，正常后方可再行施工；0+015施工分缝处按规范及设计要求进行施工缝处理；
        拉筋靠近模板侧安装锥形橡胶圈，拆模后，拆除橡胶圈，割除拉筋，同规格、标号砂浆抹平拉筋孔；
        边墙混凝土采用混凝土泵送入仓，Φ100震捣器震捣，两侧钢筋密集区域，Φ70软轴震捣器震捣，施工面终凝前人工刷毛处理施工缝，详见导流洞进口渐变段边墙施工图。
        5.4顶拱混凝土施工方法
        顶拱圆弧段采用木桁架支撑，木桁架间距50cm，木桁架下端安装在脚手架管支撑顶部的纵向12*12cm木方上，纵向木方在安装时，调整安装位置，使其尽量靠近木桁架立杆处，确保传力状态，木桁架安装后在纵向用5*10cm木方连接，木方交叉连接，采用100mm铁钉钉牢，使其纵向成为一体；
        渐变段顶拱分两段施工，施工分缝为0+015桩号，0+015～0+030先行施工，采用满堂脚手架管支撑作为模板承重支撑，为保证进水塔渐变段交叉施工，在左侧偏离中心线1.6m处设置（宽*高）4*4.5m钢结构龙门架施工通道，因顶拱混凝土厚度较大，顶拱分两层施工，下层施工厚度1m，下层施工混凝土强度达到80％时，进行上层施工，确保支撑稳定及施工安全；0+000～0+015段，在左侧偏离中心线4m处设置（宽*高）4*4.5m钢结构龙门架施工通道；
        脚手架管支撑间排距为0.8*0.8m，支撑高度按渐变段模板脚手架管支撑高度参数表进行施工，参数表中高度是指从底板到模板木排架底部的高度，含纵向背方（12*12cm）高度、与脚手架管配套可调节底座高度，施工时根据现场实际情况及进场材料进行安装调整；
        脚手架管立杆连接，采用对接连接，保证支撑强度，底部与混凝土面接触处采用可调节底座，增加承力杆与混凝土面接触面积、支撑完成后，拧紧底座，保证不出现脱空承力杆；
        渐变段顶拱中间部位直段，脚手架管安装至水平端顶部，横向采用12*12cm木方作为模板安装背方，纵向采用12*12木方安装在脚手架管顶部；
        圆弧拱架采用木方加工，下弦杆为8*10木方，圆弧段及与圆弧连接桁架直段采用8*14木方加工而成，桁架立杆斜杆均采用8*8木方，每个节点两侧均采用3.5cm杨木板或其他不易劈裂的木板用7cm铁钉连接，节点的每个结构杆上不少于4个铁钉，确保连接强度及木桁架牢固，木桁架间距50cm，制作安装按渐变段施工图进行施工。
        所有桁架制作材料均选用无腐烂、疤结的合格材料，并尽量综合考虑下料，尽量节省材料；
        两侧边墙与圆弧段连接处采用桁架外立杆支模施工，在拱脚线设置纵向背方，并用拉筋固定在边墙锚杆上，固定拱脚线成型稳定；接长段下部设置水平支撑，方便安装；
        渐变段模板采用3cm厚木模板，模板完成后，在其表面粘贴PVC混凝土模板面层，确保混凝土脱模后表面光洁。