大墩端横梁施工技术交底 10页

钱塘江四桥（复兴大桥）11#、12#端横梁、拱脚、系梁拱脚段施工技术交底杭州钱江四桥（复兴大桥）二合同段11#、12#大墩端横梁、拱脚、钢系梁拱脚段施工技术交底起草人：起草日期：审批人：审批日期：shallnotexceedthelevelofstatorcore,orarcskateboards,protectionofstatorplaterollovermayoccur),reasonabletogenerallyshouldbecentralized.Avoidlayoutvulnerabletomechanicaldamage,damp,vulnerabletocorrosionandvibration,ensureasfaraspossiblewiththeplatformstairs,liftingdevices,coverplates,electricalenclosuresandotherintervalsatarm'slength.Pipingsupportandhangersetweightoftheweightanditsinsulationshallmeetreasonablepipingdisplacement,increasesystemstability,preventionofpipelinevibrationdisplacementinoperation.Processpipingsupportandhangerspacingareshownintable1.Processpipinginthedrainpipemusthaveacertainslope(about0.002-0.004)todrain.Enterthepipeshouldbesmoothflowtothelateral,intakemanifoldintotheexpansiontankshouldbeconsideredorder,lowpressureorhighpressuredropneartheexpansiontankinlet.Pipedeflectionandexpansionmustbeconsideredtheabsorptionproblem,considerthenaturaldirectionofthepipelineusingthesmallpipetoachievethermalexpansioncompensationand,ifnecessary,consider9\n钱塘江四桥（复兴大桥）11#、12#端横梁、拱脚、系梁拱脚段施工技术交底交通部第二公路工程局杭州钱江四桥工程技术部编制说明一、编制依据1、《杭州市钱江四桥（复兴大桥）》（第三册）2、《杭州市钱江四桥（复兴大桥）》（第四册）2、《公路桥涵施工技术规范（JTJ041—2000）》3、招标技术文件4、相应的设计变更联系单二、编制目录1、概况2、支架搭设及分配梁施工3、支座的安装4、底模板施工5、劲性骨架及拱脚段主拱肋、拱脚段系梁钢骨架的安装6、钢筋的安装7、侧模板的安装8、预埋件的设置9、砼的浇注shallnotexceedthelevelofstatorcore,orarcskateboards,protectionofstatorplaterollovermayoccur),reasonabletogenerallyshouldbecentralized.Avoidlayoutvulnerabletomechanicaldamage,damp,vulnerabletocorrosionandvibration,ensureasfaraspossiblewiththeplatformstairs,liftingdevices,coverplates,electricalenclosuresandotherintervalsatarm'slength.Pipingsupportandhangersetweightoftheweightanditsinsulationshallmeetreasonablepipingdisplacement,increasesystemstability,preventionofpipelinevibrationdisplacementinoperation.Processpipingsupportandhangerspacingareshownintable1.Processpipinginthedrainpipemusthaveacertainslope(about0.002-0.004)todrain.Enterthepipeshouldbesmoothflowtothelateral,intakemanifoldintotheexpansiontankshouldbeconsideredorder,lowpressureorhighpressuredropneartheexpansiontankinlet.Pipedeflectionandexpansionmustbeconsideredtheabsorptionproblem,considerthenaturaldirectionofthepipelineusingthesmallpipetoachievethermalexpansioncompensationand,ifnecessary,consider9\n钱塘江四桥（复兴大桥）11#、12#端横梁、拱脚、系梁拱脚段施工技术交底大墩端横梁、拱脚、系梁拱脚段施工技术交底一、概况：钱江四桥（复兴大桥）Ⅱ标上部结构含水中190米跨一跨，190m跨端横梁长度为32.4m（包含两侧拱脚各3m的宽度），正中间顶部高度为5.378m，端横梁顶部从中间向两侧设置1.5%的斜坡，190m端横梁及拱脚段浇注长度为18.935m，系梁设置18束37φj15.24预应力束，拱脚处设置36束φ32精扎螺纹钢竖向预应力粗钢筋，端横梁设置8束31φj15.24预应力束；190m跨主拱拱肋矢跨比为1/4，拱肋断面形式为桁架式，主拱肋高度为4.5m，宽度为为2.6m，每一根拱肋由4根φ95cm的钢管组成，管壁厚度在4分点以下为24mm，四分点以上为22mm，上层桥面以下至拱脚拱肋断面由哑铃形的上下弦杆通过腹杆连接组成，纵向四根钢管和哑铃形断面内灌注C50混凝土，其余均为空钢管。拱肋拱脚处结构较复杂，构件较多，施工时应注意各个构件的位置，以保证安装准确。现设计院将系梁预应力束在拱脚处的位置作了调整，及将NY2弯于NY1之下，NY4弯于NY3之下，施工时应注意。二、现浇支架施工：1、支架焊接钢管时应对原在承台顶预埋钢板的位置进行复核，如有位置移动，应采取相应措施进行纠正。shallnotexceedthelevelofstatorcore,orarcskateboards,protectionofstatorplaterollovermayoccur),reasonabletogenerallyshouldbecentralized.Avoidlayoutvulnerabletomechanicaldamage,damp,vulnerabletocorrosionandvibration,ensureasfaraspossiblewiththeplatformstairs,liftingdevices,coverplates,electricalenclosuresandotherintervalsatarm'slength.Pipingsupportandhangersetweightoftheweightanditsinsulationshallmeetreasonablepipingdisplacement,increasesystemstability,preventionofpipelinevibrationdisplacementinoperation.Processpipingsupportandhangerspacingareshownintable1.Processpipinginthedrainpipemusthaveacertainslope(about0.002-0.004)todrain.Enterthepipeshouldbesmoothflowtothelateral,intakemanifoldintotheexpansiontankshouldbeconsideredorder,lowpressureorhighpressuredropneartheexpansiontankinlet.Pipedeflectionandexpansionmustbeconsideredtheabsorptionproblem,considerthenaturaldirectionofthepipelineusingthesmallpipetoachievethermalexpansioncompensationand,ifnecessary,consider9\n钱塘江四桥（复兴大桥）11#、12#端横梁、拱脚、系梁拱脚段施工技术交底1、钢管焊接前应对预埋钢板进行清理，清除钢板上的焊渣、铁锈、和杂物，以保证焊接的牢固性。2、钢管桩的水平杆要注意钢管前端加大钢板，以防对墩身混凝土造成破坏。3、190m跨钢管在安装前应在钢管与斜撑连接部位内部加强型钢十字撑，以保证钢管的局部刚度。4、支架搭设时应注意控制支架顶部的标高，并把卸架高度考虑进去。5、在搭设支架顶部的型钢分配梁时，应注意型钢分配梁应该根据现场实际情况，避开拱脚临时联结的预埋钢管和预应力束。6、由于墩帽顶部在浇注时已加高5cm，在搭设支架时应仔细计算并调整好支架的标高。7、由于钢管支架在围堰外侧还有一排钢管桩，11#墩施工时需要在内栈桥相应部位上开洞，进行支架的搭设，由于内栈桥已无法通车，因此施工时先施工端横梁底板，后施工拱脚部分的支架及底板，尽量减少影响。一、模板的施工1、底模采用钢模配合木模施工，由于在帽梁顶部预埋的构件比较多，底模上需要相应开设多个孔洞，（临时联结钢管、临时联结预应力束、支座垫石位置）为了保证施工砼时不漏浆，模板孔洞在帽梁顶部现场开设，按照已预埋好的构件位置进行开设。shallnotexceedthelevelofstatorcore,orarcskateboards,protectionofstatorplaterollovermayoccur),reasonabletogenerallyshouldbecentralized.Avoidlayoutvulnerabletomechanicaldamage,damp,vulnerabletocorrosionandvibration,ensureasfaraspossiblewiththeplatformstairs,liftingdevices,coverplates,electricalenclosuresandotherintervalsatarm'slength.Pipingsupportandhangersetweightoftheweightanditsinsulationshallmeetreasonablepipingdisplacement,increasesystemstability,preventionofpipelinevibrationdisplacementinoperation.Processpipingsupportandhangerspacingareshownintable1.Processpipinginthedrainpipemusthaveacertainslope(about0.002-0.004)todrain.Enterthepipeshouldbesmoothflowtothelateral,intakemanifoldintotheexpansiontankshouldbeconsideredorder,lowpressureorhighpressuredropneartheexpansiontankinlet.Pipedeflectionandexpansionmustbeconsideredtheabsorptionproblem,considerthenaturaldirectionofthepipelineusingthesmallpipetoachievethermalexpansioncompensationand,ifnecessary,consider9\n钱塘江四桥（复兴大桥）11#、12#端横梁、拱脚、系梁拱脚段施工技术交底1、底模安装时，测量队应随时对其进行平面位置和标高的复核。2、底模板安装时注意在底模底下的型钢分配梁的标高和调平，需要计算出每根分配梁梁底高度，以保证底模板标高的绝对准确。二、劲性骨架的加工及安装：1、所有骨架运至现场之前都应该将骨架上的铁锈等杂物清除干净。2、劲性骨架在加工场加工，采用浮吊进行吊装，12#墩内栈桥位于萧山岸，可以采用浮吊进行安装，11#墩由于内栈桥位于大墩拱脚方向，如浮吊不能够及的地方，采用50T履带吊机行至内栈桥进行配合吊装。3、各劲性骨架在加工场加工，分段运至现场后，再分段吊装上底模板，端横梁骨架安装时先吊中间段，后吊两边段。4、分段焊接成整体时应该注意接头焊缝的强度，采用对接坡口焊接方式进行连接，并在接头处加设连接钢板进行加强处理，现场技术人员要注意保证坡口的形状和焊缝的厚度。5、安装时先安装端横梁劲性骨架，再安装系梁拱脚段劲性骨架，最后安装主拱肋拱脚段。6、shallnotexceedthelevelofstatorcore,orarcskateboards,protectionofstatorplaterollovermayoccur),reasonabletogenerallyshouldbecentralized.Avoidlayoutvulnerabletomechanicaldamage,damp,vulnerabletocorrosionandvibration,ensureasfaraspossiblewiththeplatformstairs,liftingdevices,coverplates,electricalenclosuresandotherintervalsatarm'slength.Pipingsupportandhangersetweightoftheweightanditsinsulationshallmeetreasonablepipingdisplacement,increasesystemstability,preventionofpipelinevibrationdisplacementinoperation.Processpipingsupportandhangerspacingareshownintable1.Processpipinginthedrainpipemusthaveacertainslope(about0.002-0.004)todrain.Enterthepipeshouldbesmoothflowtothelateral,intakemanifoldintotheexpansiontankshouldbeconsideredorder,lowpressureorhighpressuredropneartheexpansiontankinlet.Pipedeflectionandexpansionmustbeconsideredtheabsorptionproblem,considerthenaturaldirectionofthepipelineusingthesmallpipetoachievethermalexpansioncompensationand,ifnecessary,consider9\n钱塘江四桥（复兴大桥）11#、12#端横梁、拱脚、系梁拱脚段施工技术交底各分部构件之间的骨架连接，注意要保证其连接位置的正确性，在施工时将端横梁、拱脚、主拱肋、系梁劲性骨架焊接成整体。施工中如果在拱脚位置处预应力与拱肋或骨架有冲突则在拱肋或骨架上打孔使预应力通过；施工钢筋时如果钢筋和拱肋位置冲突则将拱肋底部竖向钢筋和拱肋焊接，如钢筋和骨架位置冲突时则将钢筋位置适当移动避开骨架或者将钢筋和骨架节点板焊接，如果钢筋和预应力的管道位置冲突时，将钢筋位置适当移动避开预应力管道，如果钢筋和预应力垫板冲突时，将钢筋和垫板焊接或将钢筋位置适当移动避开预应力锚垫板。4、端横梁骨架和系梁拱脚段骨架连接时，系梁拱脚骨架伸入端横梁骨架内部，系梁主骨架上层N1件伸入端横梁内部并在端横梁骨架N3件上开相应缺口，将N1件和N3件进行焊接。5、拱肋拱脚段吊装到位后，将拱肋钢管和端横梁骨架和系梁拱脚段相应位置进行焊接连接，主拱肋钢管伸入端横梁内和端横梁骨架上层的N6件、下层的N9件及下层垂直钢管的N10件进行焊接，在钢管外表上部和端部用用P1缀杆和P2缀杆连接；系梁劲性骨架在拱脚段N3件内杆件采取在钢管肋上开槽口穿入钢管并和钢管焊接。6、主拱肋安装好后，应按照设计提供设置预拱度，并采用自制门式支架座于系梁底的支架型钢上将主拱肋固定住。一、钢筋施工：1、shallnotexceedthelevelofstatorcore,orarcskateboards,protectionofstatorplaterollovermayoccur),reasonabletogenerallyshouldbecentralized.Avoidlayoutvulnerabletomechanicaldamage,damp,vulnerabletocorrosionandvibration,ensureasfaraspossiblewiththeplatformstairs,liftingdevices,coverplates,electricalenclosuresandotherintervalsatarm'slength.Pipingsupportandhangersetweightoftheweightanditsinsulationshallmeetreasonablepipingdisplacement,increasesystemstability,preventionofpipelinevibrationdisplacementinoperation.Processpipingsupportandhangerspacingareshownintable1.Processpipinginthedrainpipemusthaveacertainslope(about0.002-0.004)todrain.Enterthepipeshouldbesmoothflowtothelateral,intakemanifoldintotheexpansiontankshouldbeconsideredorder,lowpressureorhighpressuredropneartheexpansiontankinlet.Pipedeflectionandexpansionmustbeconsideredtheabsorptionproblem,considerthenaturaldirectionofthepipelineusingthesmallpipetoachievethermalexpansioncompensationand,ifnecessary,consider9\n钱塘江四桥（复兴大桥）11#、12#端横梁、拱脚、系梁拱脚段施工技术交底钢筋宜堆置在仓库（棚）内，露天堆置时，应垫高并加遮盖，并按不同钢种、等级、牌号、规格及生产厂家分披验收，分别堆存，不得混杂，而且应设立识别标志。2、钢筋的表面应洁净，使用前应将表面的油渍、漆皮、鳞锈等清除干净。钢筋应平直，无局部弯折。钢筋的弯制和末端的弯钩应符合设计及规范要求。3、钢筋绑扎时先进行底板钢筋的施工，将箍筋设置成竖向接头，并应在底部留足够焊接的高度。4、钢筋和劲性骨架和主拱拱肋的位置如有冲突时，在骨架上开洞保证主钢筋穿过。5、主筋连接保证：如果主筋需要焊接时，两钢筋端部应预先折向一侧，使两接合钢筋轴线一致，接头双面焊缝长度》5d；单面焊缝长度》10d，主筋连接注意错开长度大于1米。6、脚段在系梁内应注意预埋和吊杆横梁连接的预埋钢板。7、端横梁钢筋依照9#端横梁同位置变更进行相应的变更施工。七、预埋件的设置拱脚内预埋件包括：拱上立柱N1、N2底座预埋钢板，系梁劲性骨架预埋、系梁钢筋、系梁内下横梁连接钢筋、系梁内首根吊杆预留导管及锚具、主拱混凝土施工输送管道，系梁、拱脚相应预应力预埋件，缆索吊主塔预埋件、设置预埋件时应保证预埋件的位置及尺寸的准确。7、混凝土的浇注1、85米跨的端横梁混凝土为C50，162.72m3，190m跨端横梁混凝土为C50，417.25m3，浇注时端横梁顶口应设置人洞。2、shallnotexceedthelevelofstatorcore,orarcskateboards,protectionofstatorplaterollovermayoccur),reasonabletogenerallyshouldbecentralized.Avoidlayoutvulnerabletomechanicaldamage,damp,vulnerabletocorrosionandvibration,ensureasfaraspossiblewiththeplatformstairs,liftingdevices,coverplates,electricalenclosuresandotherintervalsatarm'slength.Pipingsupportandhangersetweightoftheweightanditsinsulationshallmeetreasonablepipingdisplacement,increasesystemstability,preventionofpipelinevibrationdisplacementinoperation.Processpipingsupportandhangerspacingareshownintable1.Processpipinginthedrainpipemusthaveacertainslope(about0.002-0.004)todrain.Enterthepipeshouldbesmoothflowtothelateral,intakemanifoldintotheexpansiontankshouldbeconsideredorder,lowpressureorhighpressuredropneartheexpansiontankinlet.Pipedeflectionandexpansionmustbeconsideredtheabsorptionproblem,considerthenaturaldirectionofthepipelineusingthesmallpipetoachievethermalexpansioncompensationand,ifnecessary,consider9\n钱塘江四桥（复兴大桥）11#、12#端横梁、拱脚、系梁拱脚段施工技术交底混凝土浇注前应对模板、钢筋、预埋件的位置及连接作最后检查。3、构件拟分三次浇注，第一次浇注至端横梁腹板倒角底部，第二次浇顶板，第三次浇注拱脚混凝土。4、凝土浇注时，工人须进入模板内振捣，浇注时应分层，有序对称地进行，分层厚度不能超过0.6m。5、横梁内部浇注混凝土时，振捣一定要到位，现场技术员监督，振捣时振捣器的移动范围不大于作用半径的1.5倍，并应与侧模内壁保持5~10cm的距离。6、混凝土的拌和由一座60m3/h的拌和楼进行，四辆6m3的混凝土运输车进行混凝土运输，一台泵车进行混凝土的泵送。7、砼初凝时间考虑为8~10小时。8、混凝土浇注完毕，收浆完成后应及时撒水养生。9、砼强度达到0.1~0.2Mp时才能脱模，如脱模后对砼表面有损伤，应及时修补。九、模板施工：1、模板在施工前应事先试拼装，试拼装完成之后将模板面板清除干净，并采用洗衣粉洗干净，之后涂刷机油及脱模剂。2、模板接逢处应放置海绵垫，防止在浇注过程中漏浆，并将模板内侧多余海绵垫割除，应和内模割平齐。3、模板安装就位后在模板内侧用砂浆将模板底部空隙填平，防止模板底部漏浆。4、模板拉杆安装时应将PVC管伸出模板外侧，并用海绵和胶带缠紧，防止漏浆。shallnotexceedthelevelofstatorcore,orarcskateboards,protectionofstatorplaterollovermayoccur),reasonabletogenerallyshouldbecentralized.Avoidlayoutvulnerabletomechanicaldamage,damp,vulnerabletocorrosionandvibration,ensureasfaraspossiblewiththeplatformstairs,liftingdevices,coverplates,electricalenclosuresandotherintervalsatarm'slength.Pipingsupportandhangersetweightoftheweightanditsinsulationshallmeetreasonablepipingdisplacement,increasesystemstability,preventionofpipelinevibrationdisplacementinoperation.Processpipingsupportandhangerspacingareshownintable1.Processpipinginthedrainpipemusthaveacertainslope(about0.002-0.004)todrain.Enterthepipeshouldbesmoothflowtothelateral,intakemanifoldintotheexpansiontankshouldbeconsideredorder,lowpressureorhighpressuredropneartheexpansiontankinlet.Pipedeflectionandexpansionmustbeconsideredtheabsorptionproblem,considerthenaturaldirectionofthepipelineusingthesmallpipetoachievethermalexpansioncompensationand,ifnecessary,consider9\n钱塘江四桥（复兴大桥）11#、12#端横梁、拱脚、系梁拱脚段施工技术交底十、安全保证措施1、施工中安全配置应该佩带齐全，安全帽、防滑靴、救生衣等。2、钢筋安装时应采用钢管架设置上下人行梯，以保证施工人员上下模板的安全。3、大潮来前30分钟，围堰内施工人员必须上至内栈桥避开潮水，潮水过后方可继续进行施工。4、钢筋吊装须设专人指挥，所有施工人员在钢筋吊装时应听从指挥的安排，以保证钢筋吊装的安全施工。5、注意用电安全，电焊机接地必须可靠，电焊工持证上岗，在施工期间凡是涉及到接线和用电故障问题，应让专职电工进行处理。6、夜间施工时应保证有充足的照明设备。七、人员配备9、10、墩现场技术负责：李西峰（负责整个施工过程中的现场、技术管理）测量放样负责：毛晓斌（负责整个施工过程中的测量放样工作）钢筋加工作业组：陈清万、卢贵良（负责钢筋材料的加工、下料工作）钢筋安装、砼浇注作业队：洪刚（负责砼浇注、及施工过程中的各项临时性设施安装工作）砼拌和作业队：席增虎（负责砼的拌和、输送）11#、12#墩现场技术负责：王守佳、王风存（负责整个施工过程中的现场、技术管理）shallnotexceedthelevelofstatorcore,orarcskateboards,protectionofstatorplaterollovermayoccur),reasonabletogenerallyshouldbecentralized.Avoidlayoutvulnerabletomechanicaldamage,damp,vulnerabletocorrosionandvibration,ensureasfaraspossiblewiththeplatformstairs,liftingdevices,coverplates,electricalenclosuresandotherintervalsatarm'slength.Pipingsupportandhangersetweightoftheweightanditsinsulationshallmeetreasonablepipingdisplacement,increasesystemstability,preventionofpipelinevibrationdisplacementinoperation.Processpipingsupportandhangerspacingareshownintable1.Processpipinginthedrainpipemusthaveacertainslope(about0.002-0.004)todrain.Enterthepipeshouldbesmoothflowtothelateral,intakemanifoldintotheexpansiontankshouldbeconsideredorder,lowpressureorhighpressuredropneartheexpansiontankinlet.Pipedeflectionandexpansionmustbeconsideredtheabsorptionproblem,considerthenaturaldirectionofthepipelineusingthesmallpipetoachievethermalexpansioncompensationand,ifnecessary,consider9\n钱塘江四桥（复兴大桥）11#、12#端横梁、拱脚、系梁拱脚段施工技术交底测量放样负责：毛晓斌（负责整个施工过程中的测量放样工作）钢筋加工作业组：陈清万、卢贵良（负责钢筋材料的加工、下料工作）钢筋安装、砼浇注作业队：洪刚（负责砼浇注、及施工过程中的各项临时性设施安装工作）砼拌和作业队：席增虎（负责砼的拌和、输送）shallnotexceedthelevelofstatorcore,orarcskateboards,protectionofstatorplaterollovermayoccur),reasonabletogenerallyshouldbecentralized.Avoidlayoutvulnerabletomechanicaldamage,damp,vulnerabletocorrosionandvibration,ensureasfaraspossiblewiththeplatformstairs,liftingdevices,coverplates,electricalenclosuresandotherintervalsatarm'slength.Pipingsupportandhangersetweightoftheweightanditsinsulationshallmeetreasonablepipingdisplacement,increasesystemstability,preventionofpipelinevibrationdisplacementinoperation.Processpipingsupportandhangerspacingareshownintable1.Processpipinginthedrainpipemusthaveacertainslope(about0.002-0.004)todrain.Enterthepipeshouldbesmoothflowtothelateral,intakemanifoldintotheexpansiontankshouldbeconsideredorder,lowpressureorhighpressuredropneartheexpansiontankinlet.Pipedeflectionandexpansionmustbeconsideredtheabsorptionproblem,considerthenaturaldirectionofthepipelineusingthesmallpipetoachievethermalexpansioncompensationand,ifnecessary,consider9