河南快速路冬季施工技术交底 16页

施工技术交底记录年月日施管表5工程名称郑州市三环线快速化工程北三环段（南阳路—中州大道）分部工程分项工程名称冬季施工技术交底（三级）一、冬季施工准备工作⑴为保证工程施工质量，在冬季施工期应严格按冬季施工要求进行施工。⑵及时掌握天气预报的气象变化趋势及动态，以利于安排施工，做好预防准备工作。⑶根据本工程施工的具体情况，确定冬季施工需要采取防护的具体工程项目或工作内容，制定相应的冬季施工防护措施，并在物资和机械做好储备和保养工作。⑷施工机械加强冬季保养，对加水、加油润滑部件勤检查，勤更换，防止冻裂设备。⑸检查职工住房及仓库是否达到过冬条件，及时按照冬季施工保护措施施作过冬篷，准备好加温器件。当采用锅炉和暖棚施工时，作好防火、防烫措施，棚内必须有通风口，保证通风良好，并准备好各种抢救设备。⑹在进入冬季前施工现场提前作好防寒保暖工作，对人行道路、脚手架上踏步和作业场所采取防滑措施。二、临建工程冬季施工保证措施1、材料堆放及储存钢筋、钢绞线的成品、半成品及原材料的存放，尽量搭棚封闭存放。若因条件限制在室外存放时，必须采取有效措施，与地面隔离，并设置覆盖、防潮措施，防止冰雪侵害产生锈蚀，并在使用前一天，倒入封闭棚内。2、混凝土拌合站冬季施工保证措施1）混凝土拌合站保温搅拌站保温主要包括：集料仓、水泥罐、皮带机、搅拌楼称量层、搅拌主机等。⑴集料仓：集料仓保温主要是搭设保温棚，门前悬挂门帘保温棚高度须满足装载机上料高度，具体见集料仓保温示意图。engineeringqualitymaintenancenotice(5)maintenancetaskbook6.3.2.4regularlyvisitsystemsincethisengineeringdeliveredofdayupeachquarterorganizationvisitGrouponthisengineeringforvisit,groupbyprojectmanager,andIunitsproduction,andtechnology,aboutbusinesssectorheadcomposition.Inreturn,theownersofanyqualityquestionsandcomments,Iwilllisten,seriously,andmakethevisitrecord.Allconstructionqualitydefectsresponsibilityseriouslyproposesolutionsandtimelyimplementationofwarranty.Projectsecuritymanagementsectionprojectsafetymanagementsafetymanagementobjectivesoftheprojectis:toputanendtoamajoraccident,monthinjuryfrequencybelow1.2perthousand;combinedwithconstructiontocreate"safeandcivilizedconstructioninZhuhaimodelsite".OrganizationsectionIIxiaohuiwutoactasfullresponsibilityforsafetyofpeopleontheground,hewillbefullyresponsibleforthemechanicalandelectricalinstallationengineeringconstructionsafety.MsLinGuibocomradesresponsibleforday-to-daysecurity,training,education,andinspectionwork.Inordertopreventthepossibilityof...1,theimplementationofpoints:(1)teamassignedtotheAAisresponsiblefortheuseofinspection,andinconjunctionwiththe15\n图-1集料仓保温示意图⑵皮带机：皮带机保温主要采用保温棉对四周进行覆盖，防止砂石热量散失。⑶搅拌楼称量层：在拌和楼采用布置暖气管道的措施对骨料称量层进行加热。⑷搅拌主机：根据搅拌站的特点搅拌主机位于搅拌楼内，冬季到来时将搅拌楼四周封闭严实，内部采用安装暖气管道加热，具体安装暖气管数量根据气温而定。砼拌合楼启动前，操作工必须检查各部件动作是否灵活，加热砼拌合楼减速器，防止启动负荷过大烧毁控制电器。混凝土生产过程中要注意两个问题：A、计量设备：混凝土搅拌站计量设备应定期校验，保证准确，特别是外加剂计量。B、搅拌时间：混凝土的生产搅拌时间长短与混凝土的强度和均匀性有关，应从多次试验和生产实践中选择最佳搅拌时间。搅拌时间太短会对混凝土的均匀性产生极大影响，太长会产生泌水和离析现象。2）冬季施工砼的基本要求冬季条件下灌注的砼，在遭受冻结之前，采用普通硅酸盐水泥配置的混凝土其临界抗冻强度不低于设计标号的30%，C15及以下的混凝土其抗压强度未达到5Mpa前，不得受冻。在充水冻融条件下使用的砼，开始受冻时的强度不低于设计标号的70%。3）冬期施工砼对原材料的要求⑴拌和站储料仓在冬季施工时，料仓开口用和料仓端墙等包裹棉篷布悬挂可移动面门帘，减少风雪影响，确保仓内温度。⑵水泥：选用硅酸盐水泥engineeringqualitymaintenancenotice(5)maintenancetaskbook6.3.2.4regularlyvisitsystemsincethisengineeringdeliveredofdayupeachquarterorganizationvisitGrouponthisengineeringforvisit,groupbyprojectmanager,andIunitsproduction,andtechnology,aboutbusinesssectorheadcomposition.Inreturn,theownersofanyqualityquestionsandcomments,Iwilllisten,seriously,andmakethevisitrecord.Allconstructionqualitydefectsresponsibilityseriouslyproposesolutionsandtimelyimplementationofwarranty.Projectsecuritymanagementsectionprojectsafetymanagementsafetymanagementobjectivesoftheprojectis:toputanendtoamajoraccident,monthinjuryfrequencybelow1.2perthousand;combinedwithconstructiontocreate"safeandcivilizedconstructioninZhuhaimodelsite".OrganizationsectionIIxiaohuiwutoactasfullresponsibilityforsafetyofpeopleontheground,hewillbefullyresponsibleforthemechanicalandelectricalinstallationengineeringconstructionsafety.MsLinGuibocomradesresponsibleforday-to-daysecurity,training,education,andinspectionwork.Inordertopreventthepossibilityof...1,theimplementationofpoints:(1)teamassignedtotheAAisresponsiblefortheuseofinspection,andinconjunctionwiththe15\n⑶骨料：要求没有冰块、雪团，应清洁、级配良好、质地坚硬，不应含有易被冻坏的矿物。⑷拌和水：为了减少冻害，先将配合比中的用水量降低至最低限度,办法是：控制坍落度，加入选用高效减水剂。采用锅炉加热法对拌合用水进行加热，电热片的用量及布置根据环境温度、水池容量通过试验确定。拌和用水加热温度控制在30-40℃。⑸外加剂：选用通过技术鉴定、符合质量标准的外加剂。4）骨料的存放与保温⑴施工用砂①在冬期施工来临前，备足冬期施工所需的砂石料,砂石料需遮盖,四周设置排水沟，防止雪水溶化后，侵入砂石堆料中，因气温低，使砂石料凝结成块。②在拌和站内搭设保温棚，砂子料仓需要进行保温包裹，先将储料仓用一层聚氯乙烯薄膜覆盖，再用棉篷布包裹，并预留滑动式棉门帘以便装载机运料。⑵碎石存放考虑到碎石含水量较低，基本不含水，故碎石只采取覆盖措施，防雨雪、防污染，覆盖材料采用棚布。5）冬季施工的砼配制、拌合、运输⑴拌和用水的加热施工用拌和用水采用锅炉加热，加热后的水温不得低于60℃,每台拌和机按每小时生产砼85m3配备锅炉，锅炉的出水量每小时不得少于25m3(考虑2台拌和机同时运转)。为保证施工用水供应正常，另设临时加热水热锅炉,每小时热水量不小于25m3,3个3m3的水箱备用。将水热锅炉支垫离地面60cm左右,生火使水温高于60℃。⑵混凝土的搅拌经计算：混凝土出机温度要求不低于13.49℃。①砼拌和站搅拌站搭设（采用钢管架、棉棚布）保温暖棚，采用蒸汽锅炉供热，使暖棚内温度不低于10°C。搅拌机采用2×180m3engineeringqualitymaintenancenotice(5)maintenancetaskbook6.3.2.4regularlyvisitsystemsincethisengineeringdeliveredofdayupeachquarterorganizationvisitGrouponthisengineeringforvisit,groupbyprojectmanager,andIunitsproduction,andtechnology,aboutbusinesssectorheadcomposition.Inreturn,theownersofanyqualityquestionsandcomments,Iwilllisten,seriously,andmakethevisitrecord.Allconstructionqualitydefectsresponsibilityseriouslyproposesolutionsandtimelyimplementationofwarranty.Projectsecuritymanagementsectionprojectsafetymanagementsafetymanagementobjectivesoftheprojectis:toputanendtoamajoraccident,monthinjuryfrequencybelow1.2perthousand;combinedwithconstructiontocreate"safeandcivilizedconstructioninZhuhaimodelsite".OrganizationsectionIIxiaohuiwutoactasfullresponsibilityforsafetyofpeopleontheground,hewillbefullyresponsibleforthemechanicalandelectricalinstallationengineeringconstructionsafety.MsLinGuibocomradesresponsibleforday-to-daysecurity,training,education,andinspectionwork.Inordertopreventthepossibilityof...1,theimplementationofpoints:(1)teamassignedtotheAAisresponsiblefortheuseofinspection,andinconjunctionwiththe15\n/h拌制砼，搅拌机的储料斗(砂仓)均采取保温措施，先用凡布包裹，中铺电热毯加热，再铺军用棉被，外包凡布处理。水管、外加剂管用保温棉包裹,配料机计量吊杆及料斗门用碘钨灯加热以保证计量准确。②砼拌制拌制砼前及拌制后，用热水冲洗搅拌机鼓筒。砼的搅拌时间应比常温延长50％并符合有关规定，为了不使水化热过早损失，采取先进骨料及水，搅拌30s均匀后，待温度降至60℃时，再加水泥和外加剂搅拌90s，严禁将水泥与80℃以上的水直接接触，避免水泥遇到过热的水出现假凝现象,骨料中不得有冰雪和冻块。拌制掺用外加剂的混凝土时，当外加剂为粉剂时，可按要求掺量直接撒在水泥上面和水泥同时投入。当外加剂为液体，使用前按要求配置成规定溶液，然后根据使用要求，用规定浓度溶液再配置成施工溶液。各溶液分别放置于有明显标志的容器内，不得混淆。对于掺有外加剂的混凝土拌制时间应取常温拌制时间的1.5倍。抗冻剂按每个月份计算约565.6吨。砼卸出拌合机时的最高允许温度为40℃，低温早强砼的拌合温度不高于30℃。⑶混凝土的运输砼的运输过程快装快卸，不得中途转运或受阻，运送中覆盖保温防寒。按20辆混凝土搅拌运输车计算约20套保温套。当拌制的混凝土出现坍落度减小或发生速凝现象时，应进行重新调整拌和料堤的加热温度。冬季施工运输混凝土拌和物时，尽量减少混凝土拌和物热量损失措施：①尽量缩短运输距离，选择最佳运输路线，缩短运输时间。②对于混凝土输送车，容量根据混凝土施工用量和浇注时间选择以6m3为宜。但必须对罐体进行包裹，要注意防上混凝土热量损失，表面冻结、混凝土离析、坍落度变化等现象。③尽量减少装卸次数并合理组织装入、运输和卸出混凝土工作。④对于泵送混凝土，应对输送泵设小暖棚保温,泵管用保温棉包裹。保证砼入模温度在10℃以上。3、桥梁工程冬季施工保证措施engineeringqualitymaintenancenotice(5)maintenancetaskbook6.3.2.4regularlyvisitsystemsincethisengineeringdeliveredofdayupeachquarterorganizationvisitGrouponthisengineeringforvisit,groupbyprojectmanager,andIunitsproduction,andtechnology,aboutbusinesssectorheadcomposition.Inreturn,theownersofanyqualityquestionsandcomments,Iwilllisten,seriously,andmakethevisitrecord.Allconstructionqualitydefectsresponsibilityseriouslyproposesolutionsandtimelyimplementationofwarranty.Projectsecuritymanagementsectionprojectsafetymanagementsafetymanagementobjectivesoftheprojectis:toputanendtoamajoraccident,monthinjuryfrequencybelow1.2perthousand;combinedwithconstructiontocreate"safeandcivilizedconstructioninZhuhaimodelsite".OrganizationsectionIIxiaohuiwutoactasfullresponsibilityforsafetyofpeopleontheground,hewillbefullyresponsibleforthemechanicalandelectricalinstallationengineeringconstructionsafety.MsLinGuibocomradesresponsibleforday-to-daysecurity,training,education,andinspectionwork.Inordertopreventthepossibilityof...1,theimplementationofpoints:(1)teamassignedtotheAAisresponsiblefortheuseofinspection,andinconjunctionwiththe15\n第二工程处预计承台、墩身及梁体将跨冬季施工，在冬季来临前对桥梁人行道步板及托架预制工作采用在暖棚内进行施工。桥上脚手架施工必须使用防滑脚手架，上桥施工所有人员必须穿防滑靴系安全绳后方可上桥操作施工。1）冬季施工时设备要求⑴车辆①柴油动力车辆需使用-20号柴油。②有液压部分的车辆（如旋挖机、挖机、吊车、砼泵车、装载机等），使用低温液压油。机油及传动油要采用低温的规格品种。③冷却液要加注防冻液。④采用低温电瓶。⑤启动车辆时应预热至少5分钟以上。⑥轮胎运输车辆冰雪天要加防滑链。⑦长期不用时，要放掉冷却液，拆除电瓶。⑧砼运输车每次灌注完一条桩后，马上用热水清洗罐子并将水放干净。⑵旋挖机①要遵守车辆的使用规则。②当遇到暴风雪或风速大于15米/秒时，应停止工作，并将桅杆收起。③长久不用时，应将防冻液放出，拆除电瓶，并对机身做适当的覆盖。⑶灌注设备①灌浆导管丝扣在使用前要采用黄油涂抹保护。②每次灌注完后应立即用热水清洗干净导管并将丝扣涂油。③灌注完后孔口应清理干净，防止枕木等遗留在泥里。⑷预应力张拉设备包括油表、油泵、千斤顶等，在使用时的环境温度条件下配套校验，张拉时，油泵应有挡风措施，张拉设备不用时移到室内保存。雨雪天气停止张拉。2)冬季施工时钢筋加工要求冬季在负温条件下，钢筋的力学性能发生变化，屈服点和抗拉强度增加，伸长率和抗冲击韧性降低，脆性增加，加工性能下降。⑴engineeringqualitymaintenancenotice(5)maintenancetaskbook6.3.2.4regularlyvisitsystemsincethisengineeringdeliveredofdayupeachquarterorganizationvisitGrouponthisengineeringforvisit,groupbyprojectmanager,andIunitsproduction,andtechnology,aboutbusinesssectorheadcomposition.Inreturn,theownersofanyqualityquestionsandcomments,Iwilllisten,seriously,andmakethevisitrecord.Allconstructionqualitydefectsresponsibilityseriouslyproposesolutionsandtimelyimplementationofwarranty.Projectsecuritymanagementsectionprojectsafetymanagementsafetymanagementobjectivesoftheprojectis:toputanendtoamajoraccident,monthinjuryfrequencybelow1.2perthousand;combinedwithconstructiontocreate"safeandcivilizedconstructioninZhuhaimodelsite".OrganizationsectionIIxiaohuiwutoactasfullresponsibilityforsafetyofpeopleontheground,hewillbefullyresponsibleforthemechanicalandelectricalinstallationengineeringconstructionsafety.MsLinGuibocomradesresponsibleforday-to-daysecurity,training,education,andinspectionwork.Inordertopreventthepossibilityof...1,theimplementationofpoints:(1)teamassignedtotheAAisresponsiblefortheuseofinspection,andinconjunctionwiththe15\n加工厂焊钢筋接在加工棚内进行，钢筋提前运入棚内。钢筋加工棚长采用彩钢瓦。焊接完毕后的钢筋待完全冷却后才能搬运往室外，并用彩条布覆盖，暖棚内设置温度计一个。⑵施工现场进行焊接时，最低温度不低于-20℃，风力超过4级时采用脚手架、彩条布搭设临时挡风棚。焊接时减少焊接件的温度差，焊接后的接头严禁立刻接触冰雪。对气源设备采取棉篷布包裹；施焊时焊缝层间温度控制在150～350℃之间或增大电流，降低焊速。⑶材料堆放及储存钢筋的成品、半成品及原材料的存放要求搭棚并尽量封闭存放，若因条件限制在室外存放时，必须采取有效措施，与地面隔离，并设置覆盖、防潮措施，防止冰雪侵害产生锈蚀。⑷钢筋焊接尽量在室内进行，倘受条件限制只能在室外进行时，最低气温不宜低于10℃，并采取防雪挡风措施，减小焊件温度差，焊接后的接头严禁立刻接触冰雪。⑸焊条在施焊前先进行烘干，钢筋焊接处若粘有冰雪应彻底清除，或者用酒精喷灯烘干。⑹钢筋负温焊接冬季施工最重要的是钢筋焊接，焊接质量的好坏直接关系到工程结构的安全。冬期进行钢筋焊接影响因素较多。钢筋焊接前必须根据当地施工条件、气温状况进行试焊。试焊时先根据气温状况调整焊接参数及焊接气。焊接参数和气确定后再进行试焊，试焊的焊件送试验室试验，合格后再进行批量焊接。在钢筋工程焊接施工中，当环境温度低于5℃的条件下进行钢筋焊接时为钢筋负温焊接，从事钢筋焊接生产的焊工必须持有钢筋焊工考试合格证。应制定和执行安全技术措施，加强焊工的劳动保护，防止发生烧伤、触电及火灾等事故。钢筋焊接前，必须根据施工条件进行试焊合格后方可施焊。焊工应对施焊后的全部接头的外观质量进行自检，并剔除不合格接头。负温焊接时应调整焊接工艺参数，使焊缝和热影响区缓慢冷却。风力超过四级时，应采取挡风措施。焊后未冷却的接头应避免碰到冰雪。当环境温度低于-20℃时，不得进行施焊。⑺冷拉钢筋时的温度不低于-15℃，当采取可靠的安全措施时可不低于-20℃。⑻钢筋的冷拉设备、预应力钢材张拉设备以及仪表工作油液应根据实际使用时的环境温度选用，并在使用时的环境温度条件下进行配套校验。⑼在负温度下绑扎、起吊钢筋骨架用的钢索与钢筋接触处应加防滑隔垫。3)模板工程的冬季施工engineeringqualitymaintenancenotice(5)maintenancetaskbook6.3.2.4regularlyvisitsystemsincethisengineeringdeliveredofdayupeachquarterorganizationvisitGrouponthisengineeringforvisit,groupbyprojectmanager,andIunitsproduction,andtechnology,aboutbusinesssectorheadcomposition.Inreturn,theownersofanyqualityquestionsandcomments,Iwilllisten,seriously,andmakethevisitrecord.Allconstructionqualitydefectsresponsibilityseriouslyproposesolutionsandtimelyimplementationofwarranty.Projectsecuritymanagementsectionprojectsafetymanagementsafetymanagementobjectivesoftheprojectis:toputanendtoamajoraccident,monthinjuryfrequencybelow1.2perthousand;combinedwithconstructiontocreate"safeandcivilizedconstructioninZhuhaimodelsite".OrganizationsectionIIxiaohuiwutoactasfullresponsibilityforsafetyofpeopleontheground,hewillbefullyresponsibleforthemechanicalandelectricalinstallationengineeringconstructionsafety.MsLinGuibocomradesresponsibleforday-to-daysecurity,training,education,andinspectionwork.Inordertopreventthepossibilityof...1,theimplementationofpoints:(1)teamassignedtotheAAisresponsiblefortheuseofinspection,andinconjunctionwiththe15\n①按照施工组织设计安排承台、墩柱采用组合钢模板、连续箱梁采用竹胶板，在拼装前清除冻块冰渣、积雪。②组合钢模用模板脱模剂，应采用化学脱模剂，严禁使用水质脱模剂和油质脱模剂。③砼浇筑前，使用对模板进行加热，使模板温度不低于5℃。4)冬季施工的砼浇注要求⑴一般要求混凝土浇筑时要保证砼的均匀性和密实性，要保证结构的整体性，尺寸准确，钢筋、预埋件位置，拆模后砼表面平整、光洁。在浇筑前，应清除模板和钢筋上的冰雪和污垢。浇筑时，拌和物由拌板、料斗、漏斗或各类使用工具在浇筑砼时容易与容器冻结，故在浇筑前应采取防风、冻结保护措施，一旦发现砼遭冻必须作出退场处理。⑵模板支搭完毕后及时进行混凝土浇筑，浇筑前再次检查模板的尺寸，防止模板由于冻胀而产生结构尺寸变化。⑶混凝土浇注前，清除干净模板和钢筋上的冰雪和污垢，当环境气温低于-10℃时，采用暖棚法将直径大于或等于25mm的钢筋加热至正温。⑷砼的浇筑成型温度，在任何情况下均不低于5℃，砼分层连续浇筑，中途不间断，每层浇筑厚度不大于20cm，并采用机械捣固。砼拌和物入模浇筑，必须经过振捣，使其内部密实，并能充分填满模板各个角落，制成符合设计要求的构件。冬期振捣砼采用机械振捣，振捣要快速，浇筑前应做好必要的准备工作，如模板、钢筋和预埋件检查、清除冰雪冻块、浇筑时所用脚手架、马道的搭设和防滑措施检查、振捣机械和工具的准备等。混凝土入场温度不低于10℃，入模温度不低于5℃，项目部质检工程师严格审核混凝土的冬季混凝土的配比及试验情况，并对其混凝土原材料进行抽检，保证混凝土质量。混凝土浇筑时，在已硬化的混凝土上浇筑混凝土时，硬化接合面有5℃以上的温度。持续浇完成后，采取措施使结合面保持正温，直至新浇筑砼达到规定的抗冻强度。⑸混凝土施工缝的清理②已经施工混凝土的强度不得小于1.2Mpa。②施工缝处的水泥砂浆、松动石子或松弱混凝土必须凿除干净，并用空压机风吹的措施清扫干净，施工缝内不得有杂物。engineeringqualitymaintenancenotice(5)maintenancetaskbook6.3.2.4regularlyvisitsystemsincethisengineeringdeliveredofdayupeachquarterorganizationvisitGrouponthisengineeringforvisit,groupbyprojectmanager,andIunitsproduction,andtechnology,aboutbusinesssectorheadcomposition.Inreturn,theownersofanyqualityquestionsandcomments,Iwilllisten,seriously,andmakethevisitrecord.Allconstructionqualitydefectsresponsibilityseriouslyproposesolutionsandtimelyimplementationofwarranty.Projectsecuritymanagementsectionprojectsafetymanagementsafetymanagementobjectivesoftheprojectis:toputanendtoamajoraccident,monthinjuryfrequencybelow1.2perthousand;combinedwithconstructiontocreate"safeandcivilizedconstructioninZhuhaimodelsite".OrganizationsectionIIxiaohuiwutoactasfullresponsibilityforsafetyofpeopleontheground,hewillbefullyresponsibleforthemechanicalandelectricalinstallationengineeringconstructionsafety.MsLinGuibocomradesresponsibleforday-to-daysecurity,training,education,andinspectionwork.Inordertopreventthepossibilityof...1,theimplementationofpoints:(1)teamassignedtotheAAisresponsiblefortheuseofinspection,andinconjunctionwiththe15\n③新混凝土在浇注前，宜在横向施工缝处先铺一层厚约15mm并与混凝土灰砂比相同而水灰比略小的水泥砂浆。然后再继续浇注新层混凝土。施工缝处的新层混凝土要重点捣实。④冬期施工接缝混凝土时，在新混凝土浇注前对结合面进行加热使结合面有5℃以上的温度，浇注完成后，及时加热养护使混凝土结合面保持正温，直至进浇注混凝土获得规定的抗冻强度。⑤当旧混凝土面和外露钢筋暴露在冷空气中时，对新、旧混凝土施工缝1.5m范围内的混凝土和长度在1.0m范围内的外露钢筋进行防寒保温。⑹一般应避免在冬季低温期进行孔道灌浆，因进度原因必须要求灌浆时，应注意下列事项：灌浆前在孔道中通入蒸汽或热水，以融化冰屑，加热并清洗孔道，然后用空气压机将孔道中的水吹出。当孔道两端均有向上倾斜时，孔道最低点处设置排水孔。箱梁在进行孔道灌浆前，灌注部位的砼需经预热，并采用热的砂浆灌注；砼的入模温度与自然气温、保温材料及环境条件、结构表面系数和砼的强度要求均有关，考虑进行热工计算来确定或复核。管道灌浆时结构混凝土温度要求高于5度，为达到规范要求保证结构混凝土温度，采用和箱梁浇筑同样的加热方法，具体施工见梁体施工保温措施。（7）冬季施工暖棚内温度检测①暖棚温度监测的方法：②检测的范围：②温度测定记录内容：5)承台施工养护措施承台钢筋、混凝土、模板冬季施工见以上内容，具体养护措施如下：承台施工拆模前采用暖棚法保温：内部放置火炉。拆模后采用蓄热法养护：模板拆除后，表面用一层塑料布、一层棉被进行覆盖，完成后，拆除暖棚。气温在负温时不得进行洒水。engineeringqualitymaintenancenotice(5)maintenancetaskbook6.3.2.4regularlyvisitsystemsincethisengineeringdeliveredofdayupeachquarterorganizationvisitGrouponthisengineeringforvisit,groupbyprojectmanager,andIunitsproduction,andtechnology,aboutbusinesssectorheadcomposition.Inreturn,theownersofanyqualityquestionsandcomments,Iwilllisten,seriously,andmakethevisitrecord.Allconstructionqualitydefectsresponsibilityseriouslyproposesolutionsandtimelyimplementationofwarranty.Projectsecuritymanagementsectionprojectsafetymanagementsafetymanagementobjectivesoftheprojectis:toputanendtoamajoraccident,monthinjuryfrequencybelow1.2perthousand;combinedwithconstructiontocreate"safeandcivilizedconstructioninZhuhaimodelsite".OrganizationsectionIIxiaohuiwutoactasfullresponsibilityforsafetyofpeopleontheground,hewillbefullyresponsibleforthemechanicalandelectricalinstallationengineeringconstructionsafety.MsLinGuibocomradesresponsibleforday-to-daysecurity,training,education,andinspectionwork.Inordertopreventthepossibilityof...1,theimplementationofpoints:(1)teamassignedtotheAAisresponsiblefortheuseofinspection,andinconjunctionwiththe15\n图-3承台保温措施示意图混凝土初期养护的温度不得低于5℃，当达不到规定的温度时，且混凝土强度小于3.5Mpa时采取保温措施，保证温度不低于规定的温度。具体施工见《承台保温措施示意图》。6)墩柱施工养护措施墩柱钢筋、混凝土、模板冬季施工见以上内容，具体养护措施如下：拆模前采用暖棚法保温：采用蜂窝煤炉加热。墩身砼浇筑前,每个墩身四周搭设Φ48碗扣支架两排纵横杆间距0.6m；顶部高出墩顶1m。碗扣支架外部包裹防雨防水篷布，为保证墩身保温温度支架内部四周放置4个火炉分上下两层。具体见《墩柱保温措施示意图》。拆模后采用蓄热法养护：模板拆除后，表面用一层塑料布、一层棉被进行包裹外加一层密目网，完成后，拆除暖棚。气温在负温时不得进行洒水。engineeringqualitymaintenancenotice(5)maintenancetaskbook6.3.2.4regularlyvisitsystemsincethisengineeringdeliveredofdayupeachquarterorganizationvisitGrouponthisengineeringforvisit,groupbyprojectmanager,andIunitsproduction,andtechnology,aboutbusinesssectorheadcomposition.Inreturn,theownersofanyqualityquestionsandcomments,Iwilllisten,seriously,andmakethevisitrecord.Allconstructionqualitydefectsresponsibilityseriouslyproposesolutionsandtimelyimplementationofwarranty.Projectsecuritymanagementsectionprojectsafetymanagementsafetymanagementobjectivesoftheprojectis:toputanendtoamajoraccident,monthinjuryfrequencybelow1.2perthousand;combinedwithconstructiontocreate"safeandcivilizedconstructioninZhuhaimodelsite".OrganizationsectionIIxiaohuiwutoactasfullresponsibilityforsafetyofpeopleontheground,hewillbefullyresponsibleforthemechanicalandelectricalinstallationengineeringconstructionsafety.MsLinGuibocomradesresponsibleforday-to-daysecurity,training,education,andinspectionwork.Inordertopreventthepossibilityof...1,theimplementationofpoints:(1)teamassignedtotheAAisresponsiblefortheuseofinspection,andinconjunctionwiththe15\n图-4墩柱保温措施示意图7)现浇梁及悬臂梁浇筑养护保温及措施采用暖棚法保温：采用蜂窝煤路或桑拿炉供暖加热。⑴冬季施工时每联现浇梁四周搭设Φ48碗扣支架（具体支架搭设见支架方案），梁体上铺设一层塑料布一层棉被一层防雨篷布，支架四周及钢拱梁顶部采用防雨防火棉篷布包裹，养护时采用桑拿炉供暖加热，为保证湿度，桑拿炉上放置大锅内部加水。暖棚内设置温度计15个。具体施工见《梁体保温措施示意图》。⑵悬臂现浇梁浇筑养护保保温措施是在挂篮桁架上部一层塑料布一层棉被一层防雨雪篷布，两侧及底部挂一层塑料布和一层防水篷布，同时将其固定在桁架构件上，现浇悬臂段整体包裹形成暖棚。在第一段浇筑完毕后，在混凝土初凝后，在混凝土上平铺一层棉絮，在有锚固挂篮位置处应用尼龙绳将棉絮叠搭部位和锚固筋栓住形成保温整体，在进行挂篮前行及浇筑前施工时只需拆除上、下保温措施。⑶暖棚内底部温度不低于5℃。混凝土养护期间，安排专人对蒸养设备进行检查，保持棚内温度湿度。engineeringqualitymaintenancenotice(5)maintenancetaskbook6.3.2.4regularlyvisitsystemsincethisengineeringdeliveredofdayupeachquarterorganizationvisitGrouponthisengineeringforvisit,groupbyprojectmanager,andIunitsproduction,andtechnology,aboutbusinesssectorheadcomposition.Inreturn,theownersofanyqualityquestionsandcomments,Iwilllisten,seriously,andmakethevisitrecord.Allconstructionqualitydefectsresponsibilityseriouslyproposesolutionsandtimelyimplementationofwarranty.Projectsecuritymanagementsectionprojectsafetymanagementsafetymanagementobjectivesoftheprojectis:toputanendtoamajoraccident,monthinjuryfrequencybelow1.2perthousand;combinedwithconstructiontocreate"safeandcivilizedconstructioninZhuhaimodelsite".OrganizationsectionIIxiaohuiwutoactasfullresponsibilityforsafetyofpeopleontheground,hewillbefullyresponsibleforthemechanicalandelectricalinstallationengineeringconstructionsafety.MsLinGuibocomradesresponsibleforday-to-daysecurity,training,education,andinspectionwork.Inordertopreventthepossibilityof...1,theimplementationofpoints:(1)teamassignedtotheAAisresponsiblefortheuseofinspection,andinconjunctionwiththe15\n⑷暖棚内应有一定的湿度（由实验室测定），当湿度过高时，要向混凝土面及模板洒水或覆盖润湿的土工布。⑸预应力筋的张拉及孔道压浆①预应力筋张拉预应力筋冬期施工在低温下张拉锚固极易发生脆断，故要求张拉设备和各项张拉操作均在棚内正温条件下进行，油压表工作环境温度不得低于10℃。张拉油泵及千斤顶用油必须用低凝油，在操作中油泵要断续开停几次，再令其正常运转。其他冬季预应力张拉的操作与夏季相同。②预应力孔道压浆预应力混凝土的孔道压浆要在正温下进行。冬季预应力孔道压浆施工用热水进行冲洗，保证灌浆孔道温度始终控制在5℃以上，从而达到孔道压浆养生的目的。⑹防撞护栏、桥面铺装防撞护栏浇筑混凝土时，提高混凝土的浇筑速度，混凝土浇筑时应先准备好塑料布、棉被，确保混凝土浇筑时边浇筑边保温，浇筑混凝土时，每浇筑完一段，立即将塑料布加棉被覆盖混凝土表面将整个混凝土面密封严实。桥面铺装浇筑完毕后，覆盖一层塑料布加棉被覆盖，使覆盖层内温度不得低于5℃，混凝土抗压强度未达到设计强度的40%或强度达到25Mpa之前不得受冻。engineeringqualitymaintenancenotice(5)maintenancetaskbook6.3.2.4regularlyvisitsystemsincethisengineeringdeliveredofdayupeachquarterorganizationvisitGrouponthisengineeringforvisit,groupbyprojectmanager,andIunitsproduction,andtechnology,aboutbusinesssectorheadcomposition.Inreturn,theownersofanyqualityquestionsandcomments,Iwilllisten,seriously,andmakethevisitrecord.Allconstructionqualitydefectsresponsibilityseriouslyproposesolutionsandtimelyimplementationofwarranty.Projectsecuritymanagementsectionprojectsafetymanagementsafetymanagementobjectivesoftheprojectis:toputanendtoamajoraccident,monthinjuryfrequencybelow1.2perthousand;combinedwithconstructiontocreate"safeandcivilizedconstructioninZhuhaimodelsite".OrganizationsectionIIxiaohuiwutoactasfullresponsibilityforsafetyofpeopleontheground,hewillbefullyresponsibleforthemechanicalandelectricalinstallationengineeringconstructionsafety.MsLinGuibocomradesresponsibleforday-to-daysecurity,training,education,andinspectionwork.Inordertopreventthepossibilityof...1,theimplementationofpoints:(1)teamassignedtotheAAisresponsiblefortheuseofinspection,andinconjunctionwiththe15\n图-5梁体保温措施示意图8)混凝土拆模engineeringqualitymaintenancenotice(5)maintenancetaskbook6.3.2.4regularlyvisitsystemsincethisengineeringdeliveredofdayupeachquarterorganizationvisitGrouponthisengineeringforvisit,groupbyprojectmanager,andIunitsproduction,andtechnology,aboutbusinesssectorheadcomposition.Inreturn,theownersofanyqualityquestionsandcomments,Iwilllisten,seriously,andmakethevisitrecord.Allconstructionqualitydefectsresponsibilityseriouslyproposesolutionsandtimelyimplementationofwarranty.Projectsecuritymanagementsectionprojectsafetymanagementsafetymanagementobjectivesoftheprojectis:toputanendtoamajoraccident,monthinjuryfrequencybelow1.2perthousand;combinedwithconstructiontocreate"safeandcivilizedconstructioninZhuhaimodelsite".OrganizationsectionIIxiaohuiwutoactasfullresponsibilityforsafetyofpeopleontheground,hewillbefullyresponsibleforthemechanicalandelectricalinstallationengineeringconstructionsafety.MsLinGuibocomradesresponsibleforday-to-daysecurity,training,education,andinspectionwork.Inordertopreventthepossibilityof...1,theimplementationofpoints:(1)teamassignedtotheAAisresponsiblefortheuseofinspection,andinconjunctionwiththe15\n⑴冬季混凝土拆模强度应满足以下要求：满足混凝土正常温度下拆模强度的要求，并同时满足抗冻要求的规定。正常温度下混凝土拆模强度：侧模在混凝土强度达到2.5Mpa以上，且其表面及棱角不因拆模而受损时，方可拆模。底模应在混凝土强度符合以下要求时方可拆模。表-1冬季混凝土拆模强度结构类型结构跨度（m）达到混凝土设计强度的百分率（%）板、拱≤2502—875>8100梁≤875>8100悬臂梁（板）≤275>2100⑵混凝土与环境的温差不得大于15℃，当温度差在10℃以上，但低于15℃，拆除模板后立即在混凝土表面采取覆盖措施，如覆盖草袋及彩胶布。⑶采用暖棚法养护的混凝土，当养护完毕后得环境气温仍在0℃以下时，应待混凝土冷却至5℃以下后，方可拆除模板。9)冬季施工混凝土质量检查⑴混凝土浇筑时，预设测温孔。测温孔的设置：当采用蓄热法养护时在易于散热的部位设置；当采用加热养护时，在离热源不同的位置分别设置。全部测温孔均编号，并绘制测温孔布置图。测量混凝土温度时，测温表采取措施与外界气温隔离，避免冷空气影响，测温表留在测温孔内的时间不少于3min。读数要快、准。混凝土养护温度的测量符合下列规定：①当采用蓄热法养护时，在养护期间至少每6h一次。②对掺用防冻剂的混凝土，在强度未达到3.5N/mm2以前，每2h测定一次，以后每6h测定一次，⑵engineeringqualitymaintenancenotice(5)maintenancetaskbook6.3.2.4regularlyvisitsystemsincethisengineeringdeliveredofdayupeachquarterorganizationvisitGrouponthisengineeringforvisit,groupbyprojectmanager,andIunitsproduction,andtechnology,aboutbusinesssectorheadcomposition.Inreturn,theownersofanyqualityquestionsandcomments,Iwilllisten,seriously,andmakethevisitrecord.Allconstructionqualitydefectsresponsibilityseriouslyproposesolutionsandtimelyimplementationofwarranty.Projectsecuritymanagementsectionprojectsafetymanagementsafetymanagementobjectivesoftheprojectis:toputanendtoamajoraccident,monthinjuryfrequencybelow1.2perthousand;combinedwithconstructiontocreate"safeandcivilizedconstructioninZhuhaimodelsite".OrganizationsectionIIxiaohuiwutoactasfullresponsibilityforsafetyofpeopleontheground,hewillbefullyresponsibleforthemechanicalandelectricalinstallationengineeringconstructionsafety.MsLinGuibocomradesresponsibleforday-to-daysecurity,training,education,andinspectionwork.Inordertopreventthepossibilityof...1,theimplementationofpoints:(1)teamassignedtotheAAisresponsiblefortheuseofinspection,andinconjunctionwiththe15\n外界气温在每天7时、12时、16时和午夜4个时间进行记录。外界气温和棚内气温均使用自动温度仪观测。⑶冬季施工的砼测量水和外加剂溶液以及骨料的加热温度和加入搅拌时的温度，混凝土自搅拌机中卸出时和浇筑时温度，每一工作班至少测量检查四次。砼入模温度用普通温度计测定。混凝土冬期施工测温项目和次数见下表规定。混凝土冬期施工测温项目和次数表-2混凝土冬期施工测温项目和次数测温项目测温次数室外气温及环境温度每昼夜不少于4次，此外还需测最高最低气温搅拌机棚温度每一工作班不少于4次水、水泥、砂、石及外加剂深夜温度每一工作班不少于4次混凝土进场、浇筑、入模温度每一工作班不少于4次注：在室外最低气温处测量，起、止日期为本地区冬期施工起始至终了时止。由试验人员专人负责测温工作，若测试变化异常，应及时向工程部和总工汇报，以便及时采取措施，避免发生质量事故。⑷混凝土试件增设2组与结构同条件养护的试件，分别用于检验受冻前的混凝土强度和转入常温养护28d的混凝土强度。与结构件同条件养护的受冻试件解冻后方可试压。⑸所有各项测量及检验结果，均填写“混凝土工程施工记录”。4、砌体工程冬季施工保证措施本管段的砌体工程主要是桥梁承台墩身防护工程。对于分散、量少、不影响工期的工点冬季尽量不安排施工，对砌体集中且工期紧迫要求的工点可以安排在冬期施工。⑴砌体工程防冻要求砂浆强度未达到设计强度的70%前，不得使其受冻。冬期施工的气温、冬期施工前的准备符合前述要求。⑵砂浆配置及砌筑采取以下措施保证砂浆正温砌筑：砂浆原材料加热、暖棚内拌制砂浆、掺盐法、就近工点拌制、减少积存、避免倒运。1）砂浆原材料加热，水泥为12℃，砂子3℃，拌合用水加热到76℃engineeringqualitymaintenancenotice(5)maintenancetaskbook6.3.2.4regularlyvisitsystemsincethisengineeringdeliveredofdayupeachquarterorganizationvisitGrouponthisengineeringforvisit,groupbyprojectmanager,andIunitsproduction,andtechnology,aboutbusinesssectorheadcomposition.Inreturn,theownersofanyqualityquestionsandcomments,Iwilllisten,seriously,andmakethevisitrecord.Allconstructionqualitydefectsresponsibilityseriouslyproposesolutionsandtimelyimplementationofwarranty.Projectsecuritymanagementsectionprojectsafetymanagementsafetymanagementobjectivesoftheprojectis:toputanendtoamajoraccident,monthinjuryfrequencybelow1.2perthousand;combinedwithconstructiontocreate"safeandcivilizedconstructioninZhuhaimodelsite".OrganizationsectionIIxiaohuiwutoactasfullresponsibilityforsafetyofpeopleontheground,hewillbefullyresponsibleforthemechanicalandelectricalinstallationengineeringconstructionsafety.MsLinGuibocomradesresponsibleforday-to-daysecurity,training,education,andinspectionwork.Inordertopreventthepossibilityof...1,theimplementationofpoints:(1)teamassignedtotheAAisresponsiblefortheuseofinspection,andinconjunctionwiththe15\n；同混凝土原材料加热，采用暖棚法时保证砂浆砌筑温度不低于10℃。2）砂浆在暖棚内机械拌制，环境温度不低于5℃，搅拌时间不少于2min。当砂浆用量较少时，可在暖棚内人工拌制，必须严格按配合比过称计量，翻拌次数较常温增加2—3次。3）砂浆随拌随用，中途不倒运，每次拌制砂浆尽量在30min内用完，当在运输或储存过程中发生离析、泌水现象时，砌筑前要重新拌和。已凝结或冻结的砂浆一律不得再使用。4）暖棚设在每个工点，兼作砌体养生用，保证短距离运输砂浆（距离一般不超过20m），可以避免积存，无须倒运。5）砌体所用的石料，砂预先清除冰雪冻块，并且根据工程进展，提前运入棚内。石料表面与砂浆的温差不高于20度。6）暖棚按长10米、宽10米、高3米搭设，用Φ50钢管沿长、宽方向间距2米布设一圈；横杆间距1米布设3道；顶上水平杆间距2米长10米纵横布设钢管格3道。再在暖棚中间加设一道平行于长边方向的竖向支撑3根，同时加设横杆3道。钢管架外先覆盖一层聚氯乙烯薄膜，再用棉篷布包裹，供暖可采用小太阳加热，暖棚内设置温度计一个。5、路基工程冬季施工保证措施冬季低温路基施工的重点是及时排放雨雪水及路堑开挖时出现的地下水。1）低温的界定在反复冻融地区，昼夜平均气温在0℃以下且连续15d以上，均应按冬季施工办理。2）路堤处理低温施工的路堤必须在冻结前处理完毕，处理方法除满足路基一般施工规定外，还要清理干净冰雪、疏干积水、坑洼处用与地基同类型的未冻土填平压实。处理好的地基随即覆盖不使冻结。3）路基填筑⑴填料要求低温填筑路基用料，一般采用A类填料，本段路堤填筑粉质粘土。engineeringqualitymaintenancenotice(5)maintenancetaskbook6.3.2.4regularlyvisitsystemsincethisengineeringdeliveredofdayupeachquarterorganizationvisitGrouponthisengineeringforvisit,groupbyprojectmanager,andIunitsproduction,andtechnology,aboutbusinesssectorheadcomposition.Inreturn,theownersofanyqualityquestionsandcomments,Iwilllisten,seriously,andmakethevisitrecord.Allconstructionqualitydefectsresponsibilityseriouslyproposesolutionsandtimelyimplementationofwarranty.Projectsecuritymanagementsectionprojectsafetymanagementsafetymanagementobjectivesoftheprojectis:toputanendtoamajoraccident,monthinjuryfrequencybelow1.2perthousand;combinedwithconstructiontocreate"safeandcivilizedconstructioninZhuhaimodelsite".OrganizationsectionIIxiaohuiwutoactasfullresponsibilityforsafetyofpeopleontheground,hewillbefullyresponsibleforthemechanicalandelectricalinstallationengineeringconstructionsafety.MsLinGuibocomradesresponsibleforday-to-daysecurity,training,education,andinspectionwork.Inordertopreventthepossibilityof...1,theimplementationofpoints:(1)teamassignedtotheAAisresponsiblefortheuseofinspection,andinconjunctionwiththe15\n⑵填筑压实填土厚度；冬期路基施工按横断面全宽分层平铺，分层填筑厚度按正常温度施工的厚度减薄20—25%，并不得铺成斜层，已铺土层未压实前不中断施工；路基填筑每侧超宽填10—50cm并压实，待冬期过后修整边坡时削去多余部分并夯拍密实。施工地段的积雪，施工前进行清除干净。施工中遇大雪或其他原因中途停工时，整平填层及边坡并加覆盖，覆盖可采用阻燃草帘；继续施工前，清除干净边面冰雪。填筑路基要随挖、随运、随填、随压实，已铺土层未压实前，不得中断施工。保证挖、运、填、压的周转时间小于土的冻结时间。对取土场宜一次连续挖至设计标高，挖土前清除干净表面积雪，对取土场、路基边坡外露土层采用阻燃草帘进行覆盖。低温施工的路基坡面及边坡整修工作在来年解冻后进行。6、混凝土路面冬季施工保证措施⑴混凝土路面在弯拉强度尚未达到1.0MPa或抗压强度尚未达到5.0MPa时，应严防路面受冻。⑵混凝土板浇筑时，基层应无冰冻，不积冰雪，模板及钢筋积有冰雪时，应清除。混凝土拌合物不得使用带有冰雪的砂、石料，且搅拌时间应比规定的时间适当延长。⑶混凝土拌合物的运输、铺筑、振捣、压实成活等工序，应紧密衔接，缩短工序间隔时间，减少热量损失。⑷应加强保温保湿覆盖养生，可先用塑料薄膜保湿隔离覆盖或喷洒养生剂，再采用草帘、棉篷布等在其上保温覆盖。遇雨雪必须再加盖油布、塑料薄膜等。⑸冬期施工时，应在现场增加留置同条件养护试块的组数。⑹冬期养生时间不得少于28d。允许拆模时间也应适当延长。交底单位接收单位交底人接收人engineeringqualitymaintenancenotice(5)maintenancetaskbook6.3.2.4regularlyvisitsystemsincethisengineeringdeliveredofdayupeachquarterorganizationvisitGrouponthisengineeringforvisit,groupbyprojectmanager,andIunitsproduction,andtechnology,aboutbusinesssectorheadcomposition.Inreturn,theownersofanyqualityquestionsandcomments,Iwilllisten,seriously,andmakethevisitrecord.Allconstructionqualitydefectsresponsibilityseriouslyproposesolutionsandtimelyimplementationofwarranty.Projectsecuritymanagementsectionprojectsafetymanagementsafetymanagementobjectivesoftheprojectis:toputanendtoamajoraccident,monthinjuryfrequencybelow1.2perthousand;combinedwithconstructiontocreate"safeandcivilizedconstructioninZhuhaimodelsite".OrganizationsectionIIxiaohuiwutoactasfullresponsibilityforsafetyofpeopleontheground,hewillbefullyresponsibleforthemechanicalandelectricalinstallationengineeringconstructionsafety.MsLinGuibocomradesresponsibleforday-to-daysecurity,training,education,andinspectionwork.Inordertopreventthepossibilityof...1,theimplementationofpoints:(1)teamassignedtotheAAisresponsiblefortheuseofinspection,andinconjunctionwiththe15