南京地铁联络通道冻结法施工措施分

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1、南京地铁联络通道冻结法施工措施分摘要：对南京地铁一期工程TA4标联络通道冻结法施工的成功经验进行了总结。指出地铁联络通道冻结法施工中，必须采取必要的施工技术措施，才能保证施工安全、顺利的进行。本工程的成功经验可供其他工程参考。关键词：地铁；联络通道；冻结法1前言南京地铁一期工程(南北线)南起小行北至迈皋桥，全长21.7km，其中地下部分长14.5km。工程于2000年底开工，计划2003年底完成车站、区间隧道的土建工程部分。南京地铁TA4标盾构法区间隧道，北起钓鱼台工作井北侧，南至三山街车站南端头井，由左线(下行线)和右线(上行线)隧道组成。隧道外径6.2m，内径5.5m，

2、每块管片宽为1.2m，厚为350mm。联络通道位于两站区间隧道中间，隧道中心埋深13.13m，联络通道及泵站采取合并建造模式，edgesshouldbecleaned,aftermakingsurethatnodefectshallbemarkedwithamarkerpentowritedownweldingneartheweld,includingthesloganofwelding,welders,etc.(16)weldingQianPreheatandtheweldingHouheattreatmentpipeweldingQianPreheatandthewel

3、dingHouheattreatmentprocessconditionsweldingQianPreheatandtheweldingHouheattreatmenttemperaturetableprojectmaterialweldingQianpreheattemperature(℃)weldingHouheattreatmentandtheinsulationtime(℃/H)wallthick(mm)temperature(℃)wallthick(mm)temperature(℃)20≥26100~200>36600~650/1-1.515CrMo≥10150~

4、200>10670~700/1.2-2Preheatandtheheattreatmentprocessinthe,Innerandouterwalltemperatureshallbekeptuniform,inordertoavoidinternalstresses.Preheatingbeforeweldingandpostweldheattreatment,shallmeasureandrecordthetemperature,temperaturemeasurementlocationsandnumberofpointsarereasonable.Pronetow

5、elddelayedcrackofsteel,postweldheattreatmentafterweldingshouldbecarriedoutpromptly,whennotconductingtimelypostweldheattreatment,shouldbeuniformlyheatedto200~300℃immediatelyafterweldingandinsulationandslowcooling,...26mmmorethan20steelpipeweldingpreheatingbeforeweldingshouldbecarriedout,36m

6、mtheaboveheattreatmentafterweldingshouldbedone.Beforeweldingandheattreatmentusedoxyacetyleneflameheating,heattreatmentafterweldingusingspecialheattreatmentafterweldingequipment.Hardnessafterheattreatmentofweldsneededtesting.6.5.4sidesofthedissimilarsteelweldingwhenwerenon-austeniticsteelor

7、austeniticsteel,alloycontentaccordingtoloweronesideofthebasemetalorselectingweldingmaterialinbetween.Whenoneofthesidesofmaterialwhenausteniticsteels,shouldselectthe11它既保证上、下行隧道间的联络作用和必要时乘客安全疏散的功能，又起到地铁运营中两车站之间的集、排水作用。工程结构由两个与隧道相交的喇叭口、通道以及集水井等组成。地铁联络通道一般位于区间隧道的