做好由辅助坑道转入正洞施工安全质量预控2014.3.25》

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1、做好由辅助坑道转入正洞施工质量安全建议一、做好预控的必要性当前由辅助坑道仓促转入正洞施工暴露出来的主要问题：交叉口专项施工方案未履行评审和审批程序、未进行技术培训和技术交底、工装设备不到位或不配套，标准底、不统一等系列问题，仓促进入正洞施工，从而导致正洞施工质量安全控制受之影响较大，不便控制或难以控制，有的甚至停下工来等设备或进行设备改装，或者进行其它一些本该已经完成而没有完成的准备工作，结果走了很多弯路，得不偿失。请各施工单位从思想上、行动上引起高度重视，认真总结经验，科学组织，提前做好预控，确保正洞施工顺利推进和质量安全稳定受控。二、预控内容1、

2、技术方案（1）交叉段专项施工方案隧道斜井及横洞进大断面正线隧道交叉口位置施工是暗挖隧道设计及施工的重难点。常见的施工方案主要为自横洞开始顺坡爬坡扩挖法及先进主洞后反序施工法等常规方法。各种方案以各个洞口的实际围岩地质情况针对性而设，不同的方案，各有针对性，各有其优缺点，合理选择方案带来的施工结果往往大有异常。①自横洞后段开始爬坡扩挖法Opinionsandsuggestionsontheparty'smasslineeducationalpracticeAccordingtothecentralandprovincial,municipalunifi

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