隧道ⅳ级围岩深埋段开挖及初期支护技术交底书》

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1、公司施技[2005]104号—3—2技术交底书编制单位/部门：第1页共9页主送单位隧道架子队编号项目名称隧道Ⅳ级围岩深埋段开挖及初期支护日期2011年3月1日交底内容：左线Ⅳ级围岩深埋段起讫里程为LK182+540～LK182+810，右线Ⅳ级围岩深埋段起讫里程为RK182+560～RK182+880，施工中严格遵守“管超前、严注浆、短开挖、强支护、勤测量、早封闭”的原则。若施工中围岩划分与设计不符时，应根据围岩监控量测结果，及时调整开挖方式和修正支护参数。本围岩段二次衬砌亦作为承载结构，采用模筑混凝土结构。一、深埋段采用早强水泥砂浆锚杆为超前支护，超前支护

2、采用20MnSiФ25螺纹钢筋，长度4.5米，环向间距4.5m,外插角10。～15。，纵向水平搭接≥1m。二、Ⅳ级围岩一般采用半断面正台阶法施工，开挖采取爆破施工。编制人复核人签收人Opinionsandsuggestionsontheparty'smasslineeducationalpracticeAccordingtothecentralandprovincial,municipalunifieddeployment,accordingtomunicipalPartycommittee"aboutcarryingouttheparty'smasslin

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5、retaryXiJinpingbookseriesofimportantspeech,earnestlyimplementtheCentralCommitteereally,opinionsandadvice><<>,

6、alrequirementsof"forthepeoplepragmatichonestpeopleasthetheme,incarryingforwardthespiritofZhuanglangZhuang,improvetheirworkstyle,servicetothemassesofthepeople,thefoundationofconsolidatinggrassroots,promotetransformationacrossefforts,tofurtherimplementthecentraleightregulationsand

7、eoppositionpartyandgovernmentausteritywasteregulations","doublesection"provincialregulations,municipalprovisionsofthe"twelve"planandtheimplementationmeasuresfor

8、alism,bureaucracy,hedonism