双线简支箱梁预制混凝土施工技术交底

'技术交底书编制部门工程部编号LXSZ-GCB-003主送部门生产部、安质部、机物部、搅拌站、实验室、工班日期2010-06-30工程名称肃州制梁场工程部位梁体混凝土施工内容：1、见后附《技术交底书》。保证质量措施严格按照施工图、技术交底书作业。环保措施做好防尘、污水排放措施，并将工作场地清扫干净。安全措施派专人负责现场施工安全。编制：复核：签收：thethree.Third,seriouslyimplementtheCentral,provincial,municipalandCountypartyCommitteeontheestablishmentofasoundworkstyleconstructionviewsofthelong-actingmechanismandontheimplementationofthethreeSunscallsforfurtherstrengtheningofeducationadministrationandsupervisionofpartymembersandcadres,fromthe...Acceptsupervisionandearnestlygrasp,balance,twopromotion,importantjobhimself,theSecretaryofdevelopment,majorissuespersonally.5.stronglysupportsaccountabilitydisciplinediscipline.Administrativeprovisionsonstrictenforcementofpartymembersandcadrestoaskallthedisciplineinspectionandsupervisioncadresinaccordancewiththeironitselfmustbeahardrequirement,adheretotheresponsibilitiesandplay,earnestlyfulfilltheirdutiesofsupervisionandaccountabilityforZhiJI.ZhenintofullplayandtheoversightroleoftheCommission,establishandimprovethevillagerulesandcommunityconventions,promotingjointpublicandservingthesunshinepubliclyavailableimplementationoftheplatformforaction.Disciplineinhandlingcases,adheretofindalongwithscrutiny,toappointtheinterferenceandresistance,backedbycourageous,findtheproblemcorrected,powerfulmaintenancetheseriousnessofresponsibilityofuncorrupted.ActivelypromotethedisciplineCommitteedetailedswitchand,casting,tree-generatingactivities.　　Promote 技术交底书双线简支箱梁预制混凝土施工技术交底1、混凝土的配料和拌制1.1、混凝土原材料水泥采用强度等级为P.O42.5的低碱普通硅酸盐水泥；细骨料采用细度模数为2.6～3.0的中砂；粗骨料采用5～10mm,10～20mm碎石；外加剂采用LGS-XC聚羧酸高效减水剂。混凝土配合比选定由试验室通过试验选定，选定C50梁体混凝土理论配合比为：水泥：粉煤灰：砂：5～10mm碎石：10～20mm碎石：高效减水剂：水=1:0.26:1.88:1.17：1.75：0.014：0.39，水胶比为0.31，每立方米混凝土用料量：水泥377kg，粉煤灰100kg，砂675kg，5～10mm碎石440kg，10～20mm碎石660kg，高效减水剂5.25kg，水124kg，，如因条件发生变化等原因，配合比重新选定时，由试验室及时通知有关部门。1.2、混凝土采用拌合搂集中拌制，拌合前，试验人员必须测定砂石的含水率，准确测定因天气变化而引起的粗细骨料含水量变化，以便及时调整施工配合比，将选定的理论配合比换算成施工配合比，计算每盘混凝土实际需要的各种材料量，填写配料通知单送交拌合楼。混凝土配料必须按试验室通知单进行，并有试验人员值班，配料采用全自动计量系统计量，并在微机上做好记录。一般情况下，含水量每班抽测两次，雨天随时抽测，并按测定结果及时调整混凝土施工配合比。1.3、减水剂采用水剂，减水剂的贮存不得采用铁制的容器。1.4、混凝土开盘前，模板安装、钢筋安装等工序的检查签证手续完备齐全，如没有签证手续不允许开盘。1.5、混凝土开盘前，认真进行劳动力组织，掌握天气预报情况，并采取相应的施工措施。1.6、混凝土每盘的搅拌时间不少于120s，也不宜大于180s。搅拌时，先向搅拌机投入细骨料、水泥、粉煤灰和减水剂，搅拌均匀后，再加入所需用水量，待砂浆充分搅拌后再投入粗骨料，充分搅拌后，再加入外加剂至均匀为止。每一阶段的搅拌时间不宜少于30s。thethree.Third,seriouslyimplementtheCentral,provincial,municipalandCountypartyCommitteeontheestablishmentofasoundworkstyleconstructionviewsofthelong-actingmechanismandontheimplementationofthethreeSunscallsforfurtherstrengtheningofeducationadministrationandsupervisionofpartymembersandcadres,fromthe...Acceptsupervisionandearnestlygrasp,balance,twopromotion,importantjobhimself,theSecretaryofdevelopment,majorissuespersonally.5.stronglysupportsaccountabilitydisciplinediscipline.Administrativeprovisionsonstrictenforcementofpartymembersandcadrestoaskallthedisciplineinspectionandsupervisioncadresinaccordancewiththeironitselfmustbeahardrequirement,adheretotheresponsibilitiesandplay,earnestlyfulfilltheirdutiesofsupervisionandaccountabilityforZhiJI.ZhenintofullplayandtheoversightroleoftheCommission,establishandimprovethevillagerulesandcommunityconventions,promotingjointpublicandservingthesunshinepubliclyavailableimplementationoftheplatformforaction.Disciplineinhandlingcases,adheretofindalongwithscrutiny,toappointtheinterferenceandresistance,backedbycourageous,findtheproblemcorrected,powerfulmaintenancetheseriousnessofresponsibilityofuncorrupted.ActivelypromotethedisciplineCommitteedetailedswitchand,casting,tree-generatingactivities.　　Promote 2、混凝土拌合技术要求2.1、在配制混凝土拌合物时，混凝土原材料严格按照施工配合比要求进行准确称量，水、胶凝材料、外加剂的质量用量应准确到±1％；砂、石料的质量用量准确到±2％。2.2、混凝土拌制前，应严格测定砂、石含水率，并根据测试结果、环境条件、工作性能要求等及时调整施工配合比。一般情况下，含水量每班抽测2次，雨天应随时抽测，并按测定结果及时调整混凝土施工配合比。2.3、混凝土拌和物的入模含气量应满足设计要求，应控制在2％～4％，混凝土拌合物坍落度45min损失不宜大于10％。2.4、混凝土拌制过程中，应对混凝土拌和物的坍落度进行测定，测定值符合理论配合比的要求，偏差不宜大于±20mm。2.5、混凝土浇筑时模板温度宜在5℃～35℃，混凝土拌合物入模温度宜在10℃～30℃。2.6、搅拌时，采用一次投料法，即将砂、石、水泥和水一起加入搅拌筒内进行搅拌。搅拌均匀后，再加入所需水量，待砂浆搅拌充分后再投入粗骨料，并继续搅拌至均匀为止。且每一阶段的搅拌时间不少于30s，总搅拌时间不少于120秒，也不得超过180秒。2.7、搅拌设备停用时间不宜超过30min，最长不应超过混凝土的初凝时间。否则，应将搅拌机彻底清洗后才能重新拌和混凝土。3、冬期拌合混凝土特殊要求当昼夜平均气温（最高和最低气温的平均值或当地时间6时、14时及21时室外气温的平均值）连续3天低于5℃或最低气温低于-30C时，混凝土施工应按冬期施工有关规定办理。3.1、冬期施工期间，混凝土抗压强度达到设计强度的30％前，混凝土均不得受冻。thethree.Third,seriouslyimplementtheCentral,provincial,municipalandCountypartyCommitteeontheestablishmentofasoundworkstyleconstructionviewsofthelong-actingmechanismandontheimplementationofthethreeSunscallsforfurtherstrengtheningofeducationadministrationandsupervisionofpartymembersandcadres,fromthe...Acceptsupervisionandearnestlygrasp,balance,twopromotion,importantjobhimself,theSecretaryofdevelopment,majorissuespersonally.5.stronglysupportsaccountabilitydisciplinediscipline.Administrativeprovisionsonstrictenforcementofpartymembersandcadrestoaskallthedisciplineinspectionandsupervisioncadresinaccordancewiththeironitselfmustbeahardrequirement,adheretotheresponsibilitiesandplay,earnestlyfulfilltheirdutiesofsupervisionandaccountabilityforZhiJI.ZhenintofullplayandtheoversightroleoftheCommission,establishandimprovethevillagerulesandcommunityconventions,promotingjointpublicandservingthesunshinepubliclyavailableimplementationoftheplatformforaction.Disciplineinhandlingcases,adheretofindalongwithscrutiny,toappointtheinterferenceandresistance,backedbycourageous,findtheproblemcorrected,powerfulmaintenancetheseriousnessofresponsibilityofuncorrupted.ActivelypromotethedisciplineCommitteedetailedswitchand,casting,tree-generatingactivities.　　Promote 3.2、钢筋笼安装就位、模板安装好后，在未灌注混凝土之前，要用蓬布盖好，待混凝土施工时，将蓬布揭开撤走。混凝土灌注前应对模板和安装就位的钢筋用蒸汽进行预温，并注意冷凝水的情况。3.3、搅拌混凝土前，应先经过热工计算，并经试拌确定水和骨料需要预热的最高温度，以保证混凝土的入模温度不低于10℃。水泥、粉煤灰、外加剂等可在使用前运入暖棚进行自然预热名单不得直接加热。3.4、砂石料棚进行封闭保温，并设置地暖进行加热，使砂石料能达到热工计算的温度，保证混凝土的施工。3.5、水泥不得直接加热，水泥库房应遮盖严实，可在水泥库房内设供暖设施，并有专人值班看守。3.6、混凝土灌注时间宜选在上午10时至下午4时之间。3.7、混凝土灌注前应认真检查拌合站、混凝土罐车、混凝土泵车、振捣器、供电线路、备用发电机组、蒸汽管道、蒸汽锅炉等，确保混凝土冬施正常运行。3.8、混凝土灌注时加强对振捣人员和抹面人员组织管理,提高工效,一边灌注一边盖养护罩,防止混凝土受冻。4、混凝土搅拌站安全操作规程4.1、作业前的准备（1）按出厂说明书规定运输和安装混凝土搅拌站，认真进行调试。（2）检查配料机各部是否完好，料斗门关闭是否严密，配料输送带与皮带输送机搭接是否合适，皮带输送机下是否有异物妨碍输送机工作。搅拌站工作时，以上区域严禁闲人和异物进入。（3）检查输送带的质量情况，如出现裂纹等现象应及时更换。对输送带的张拉紧度调紧适当，不得跑偏。（4）检查拌合站操作控制系统各部是否完好，控制线连接是否可靠，电脑显示的定量配合比参数是否与要求相符。（5）检查齿轮箱油位和油质，如油不足必须添加，不清洁必须更换。（6）检查进料、出料闸门，以及搅拌站的磨损情况。磨损超限时及时修复或更换。（7）检查各部螺栓并紧固。thethree.Third,seriouslyimplementtheCentral,provincial,municipalandCountypartyCommitteeontheestablishmentofasoundworkstyleconstructionviewsofthelong-actingmechanismandontheimplementationofthethreeSunscallsforfurtherstrengtheningofeducationadministrationandsupervisionofpartymembersandcadres,fromthe...Acceptsupervisionandearnestlygrasp,balance,twopromotion,importantjobhimself,theSecretaryofdevelopment,majorissuespersonally.5.stronglysupportsaccountabilitydisciplinediscipline.Administrativeprovisionsonstrictenforcementofpartymembersandcadrestoaskallthedisciplineinspectionandsupervisioncadresinaccordancewiththeironitselfmustbeahardrequirement,adheretotheresponsibilitiesandplay,earnestlyfulfilltheirdutiesofsupervisionandaccountabilityforZhiJI.ZhenintofullplayandtheoversightroleoftheCommission,establishandimprovethevillagerulesandcommunityconventions,promotingjointpublicandservingthesunshinepubliclyavailableimplementationoftheplatformforaction.Disciplineinhandlingcases,adheretofindalongwithscrutiny,toappointtheinterferenceandresistance,backedbycourageous,findtheproblemcorrected,powerfulmaintenancetheseriousnessofresponsibilityofuncorrupted.ActivelypromotethedisciplineCommitteedetailedswitchand,casting,tree-generatingactivities.　　Promote （8）联接称量斗的橡胶套不得受拉力和压力，否则影响称量精度。（9）检查电源、水源是否符合设备说明书规定的要求，是否联接可靠。电器控制柜必须由技术好、责任心强的专职电工保管，其它人员不得擅自打开电气柜。要认真检查电器装置，确保能准确及时地控制机器，防止漏电、短路等不正常现象。（10）检查所有开关应在切断位置、所有保险应安装妥当。避雷装置应处于完好状态。（11）检查储料仓胶凝材料是否充足，外加剂储罐内的外加剂量是否达到要求，水罐内水量是否充足，水源是否可靠，水应清洁、无泥浆、沙石等杂物。（12）检查称量装置应能正常使用；计量应精确，其误差不能超过1％。在机械使用前必须按规定将所有计量指示调到零位。（13）按配合比的要求准备合格的砂、石骨料。超出许可范围的禁止使用。（14）检查出料口漏斗是否和混凝土输送泵对正。4.2、安全作业中注意事项（1）起动机械后，仔细检查机械的运转情况，检查各旋转部件的旋转方向是否与所标箭头方向一致。（2）密切监视各部件是否正常工作，注意电压是否稳定，发现异常立即停机。（3）随时监视各种仪表。发现异常应及时调整和处理。（4）机械运转中不能进行维修、保养、润滑、紧固等作业。禁止将手、脚放在闸门、搅拌机、配料机、皮带输送机、螺旋输送机等附近。搅拌机起动前应盖好仓盖。（5）当电气装置跳闸时，应查明原因，排除故障后再合闸。不准强行合闸。（6）夜间工作时，应有足够的照明。（7）操作人员和混凝土灌注人员以及操作人员之间必须密切配合，确保机械正常工作，确保符合工程需要的高质量混凝土。thethree.Third,seriouslyimplementtheCentral,provincial,municipalandCountypartyCommitteeontheestablishmentofasoundworkstyleconstructionviewsofthelong-actingmechanismandontheimplementationofthethreeSunscallsforfurtherstrengtheningofeducationadministrationandsupervisionofpartymembersandcadres,fromthe...Acceptsupervisionandearnestlygrasp,balance,twopromotion,importantjobhimself,theSecretaryofdevelopment,majorissuespersonally.5.stronglysupportsaccountabilitydisciplinediscipline.Administrativeprovisionsonstrictenforcementofpartymembersandcadrestoaskallthedisciplineinspectionandsupervisioncadresinaccordancewiththeironitselfmustbeahardrequirement,adheretotheresponsibilitiesandplay,earnestlyfulfilltheirdutiesofsupervisionandaccountabilityforZhiJI.ZhenintofullplayandtheoversightroleoftheCommission,establishandimprovethevillagerulesandcommunityconventions,promotingjointpublicandservingthesunshinepubliclyavailableimplementationoftheplatformforaction.Disciplineinhandlingcases,adheretofindalongwithscrutiny,toappointtheinterferenceandresistance,backedbycourageous,findtheproblemcorrected,powerfulmaintenancetheseriousnessofresponsibilityofuncorrupted.ActivelypromotethedisciplineCommitteedetailedswitchand,casting,tree-generatingactivities.　　Promote （8）做好拌合站的工作运转记录，对每一罐混凝土都应做好记录，存入微机并通过打印机打出当班的工作记录，报告调度部门。（9）严禁与拌合站无关的人员进入拌合机工作室、微机室。（10）混凝土拌合站微机、打印机为专用设备，严禁将与混凝土拌合站无关的电脑软件、光盘在微机上使用，严禁用打印机打印与拌合站无关的资料。4.3、作业后注意事项（1）工作完成后应将散装水泥罐闸门关好，将螺旋管内水泥全部输送出来，不要残留任何水泥在管内。（2）彻底清洗机械及现场。对搅拌筒内的混凝土要清洗干净。（3）将空压机放气排水，清洗添加剂管。（4）对机械进行维护保养，对各润滑点加注润滑油（脂），对需保护部分涂油防锈。（5）冬季作业结束后应将水排放干净。5、混凝土的运输混凝土的运输选用与混凝土搅拌机相匹配的混凝土输送泵车。5.1、混凝土浇注前的准备工作（1）检查并确认钢筋骨架、模板、预埋件是否符合技术要求，是否签证完毕，如无签证，则混凝土不能开盘浇注。（2）混凝土泵车与混凝土输送车对接后，按所用混凝土泵车使用说明书的规定进行全面检查，先压入砂浆疏通管道并润滑，并泵入车内，不得入模，符合要求后方能开机进行运转。（3）混凝土施工现场统一指挥和调度，以保证顺利进行泵送浇筑。对混凝土输送泵车、混凝土搅拌楼和浇筑台位之间，规定联络信号并配备通讯设备，以便及时联络，统一调配。（4）对混凝土泵车及拌和楼的操作人员，必须经过专门培训并有上岗证书，否则不能上岗操作。（5）检查水、电供应是否有保证；备用的混凝土泵车是否到位；指挥人员、管理人员和操作工人是否齐全并经过技术交底等。thethree.Third,seriouslyimplementtheCentral,provincial,municipalandCountypartyCommitteeontheestablishmentofasoundworkstyleconstructionviewsofthelong-actingmechanismandontheimplementationofthethreeSunscallsforfurtherstrengtheningofeducationadministrationandsupervisionofpartymembersandcadres,fromthe...Acceptsupervisionandearnestlygrasp,balance,twopromotion,importantjobhimself,theSecretaryofdevelopment,majorissuespersonally.5.stronglysupportsaccountabilitydisciplinediscipline.Administrativeprovisionsonstrictenforcementofpartymembersandcadrestoaskallthedisciplineinspectionandsupervisioncadresinaccordancewiththeironitselfmustbeahardrequirement,adheretotheresponsibilitiesandplay,earnestlyfulfilltheirdutiesofsupervisionandaccountabilityforZhiJI.ZhenintofullplayandtheoversightroleoftheCommission,establishandimprovethevillagerulesandcommunityconventions,promotingjointpublicandservingthesunshinepubliclyavailableimplementationoftheplatformforaction.Disciplineinhandlingcases,adheretofindalongwithscrutiny,toappointtheinterferenceandresistance,backedbycourageous,findtheproblemcorrected,powerfulmaintenancetheseriousnessofresponsibilityofuncorrupted.ActivelypromotethedisciplineCommitteedetailedswitchand,casting,tree-generatingactivities.　　Promote 5.2、混凝土泵送车操作程序及方法（1）泵水检查，确认混凝土泵和输送管道中无异物。（2）用水泥砂浆对混凝土泵车和输送管内壁润滑。（3）开始泵送时，混凝土泵应处于慢速、匀速并随时可反泵的状态。待各方面情况都正常后再转入正常泵送。（4）混凝土泵送即将结束前，正确计算尚需用的混凝土数量，并应及时利用通讯设备告知混凝土拌合楼，严禁浪费混凝土，混凝土泵车和运输车作业完成后，集中地方清洗，严禁随处堆码、洒落混凝土残渣，对梁场环境造成污染。5.3、混凝土输送泵车的摆设（1）混凝土输送泵车应停放在制梁台座两侧，困难情况下可设在梁体两端，并对称布置，其两台泵车的作业范围应完全概括整个梁面，（2）支腿的支撑面内部不得有空间或不平的地方，宜常在水平面上作业，应设置在满足设备支持面允许的表面压力条件范围内，如果超过单位面积的许用负荷值，需要将支持表面加宽。6、混凝土的灌筑6.1、灌筑设备及料具（1）插入式振动棒40台：普通插入式振动棒(直径60mm)20台，普通插入式振动棒(直径70mm)20台，普通插入式振动棒(直径30mm)2台。（2）安设附着式振动器276台。型号：HD-C50，激震力12KN，振动频率9000rpm/s。（3）混凝土振动赶浆抹面机2台。6.2、混凝土灌筑顺序（1）混凝土灌筑总的原则是“先底板、再腹板、最后顶板，从一端到另一端，分层连续灌注成型”。（2）混凝土的灌筑采用连续整体灌筑，一次成型，浇筑时间控制在6h以内。灌注时采用斜向分段，水平分层的方法。水平分层厚度控制在30cm以内，先后两层的间隔时间不得超过1个小时时间。（3）灌注方法：灌注混凝土采用两台混凝土泵车由箱梁一端向另一端对称灌注。thethree.Third,seriouslyimplementtheCentral,provincial,municipalandCountypartyCommitteeontheestablishmentofasoundworkstyleconstructionviewsofthelong-actingmechanismandontheimplementationofthethreeSunscallsforfurtherstrengtheningofeducationadministrationandsupervisionofpartymembersandcadres,fromthe...Acceptsupervisionandearnestlygrasp,balance,twopromotion,importantjobhimself,theSecretaryofdevelopment,majorissuespersonally.5.stronglysupportsaccountabilitydisciplinediscipline.Administrativeprovisionsonstrictenforcementofpartymembersandcadrestoaskallthedisciplineinspectionandsupervisioncadresinaccordancewiththeironitselfmustbeahardrequirement,adheretotheresponsibilitiesandplay,earnestlyfulfilltheirdutiesofsupervisionandaccountabilityforZhiJI.ZhenintofullplayandtheoversightroleoftheCommission,establishandimprovethevillagerulesandcommunityconventions,promotingjointpublicandservingthesunshinepubliclyavailableimplementationoftheplatformforaction.Disciplineinhandlingcases,adheretofindalongwithscrutiny,toappointtheinterferenceandresistance,backedbycourageous,findtheproblemcorrected,powerfulmaintenancetheseriousnessofresponsibilityofuncorrupted.ActivelypromotethedisciplineCommitteedetailedswitchand,casting,tree-generatingactivities.　　Promote 注：下图以半个梁体来表示梁体混凝土浇注顺序。第一步为保证底板与腹板交接处混凝土密实，尤其端部变坡段及底板顶面与内模倒角处易出现腹板混凝土在压力或外力挠动下会沿内模壁下缩形成麻面或露筋，必须在浇注时分层将从一端向另一端底板顶面与腹板衔接处灌满。第二步从一端向另一端通过腹板对称灌注底板与腹板倒角处的混凝土，为了防止出现翻浆现象，注意控制混凝土的灌注厚度和上下两层之间的灌注时间差。第三步底板中间混凝土不足部分由顶板中心浇注孔两端向中间进行灌注，并同时进行底板混凝土振捣，震动采用插入式振动棒捣固密实，并进行底板混凝土表面赶光、压实、抹平。thethree.Third,seriouslyimplementtheCentral,provincial,municipalandCountypartyCommitteeontheestablishmentofasoundworkstyleconstructionviewsofthelong-actingmechanismandontheimplementationofthethreeSunscallsforfurtherstrengtheningofeducationadministrationandsupervisionofpartymembersandcadres,fromthe...Acceptsupervisionandearnestlygrasp,balance,twopromotion,importantjobhimself,theSecretaryofdevelopment,majorissuespersonally.5.stronglysupportsaccountabilitydisciplinediscipline.Administrativeprovisionsonstrictenforcementofpartymembersandcadrestoaskallthedisciplineinspectionandsupervisioncadresinaccordancewiththeironitselfmustbeahardrequirement,adheretotheresponsibilitiesandplay,earnestlyfulfilltheirdutiesofsupervisionandaccountabilityforZhiJI.ZhenintofullplayandtheoversightroleoftheCommission,establishandimprovethevillagerulesandcommunityconventions,promotingjointpublicandservingthesunshinepubliclyavailableimplementationoftheplatformforaction.Disciplineinhandlingcases,adheretofindalongwithscrutiny,toappointtheinterferenceandresistance,backedbycourageous,findtheproblemcorrected,powerfulmaintenancetheseriousnessofresponsibilityofuncorrupted.ActivelypromotethedisciplineCommitteedetailedswitchand,casting,tree-generatingactivities.　　Promote 第四步由一端向一端对称浇注两侧腹板混凝土，要防止两边混凝土上面高低悬殊造成的模偏移，腹板混凝土采用插入式振动棒和附着式振动器振捣，附着式振动器振动时每次联结不少于4台，同时振捣，振动时间以混凝土表面不再下沉，不再有气泡出现，混凝土不离析为止，振动棒禁止触动预埋橡胶管及通风孔等预埋件，每次振动时与模板保持5～10cm的距离。第五步顶板混凝土浇注由一端向一端进行浇注，顶板面积较大，因此需增加劳动力进行捣固、赶光抹面等，保证桥面质量。6.3、混凝土灌筑技术要求（1）混凝土入模前，应仔细检查模板、支架、钢筋、预埋件及其紧固程度和保护层垫块的位置、数量等，并指定专人作重复性检查，以提高钢筋保护层垫块的质量保证率。（2）混凝土入模前，应采用专用设备测定混凝土的温度、坍落度、含气量、水胶比及泌水率等工作性能。混凝土的入模温度宜控制在10～30℃之间。（3）混凝土灌注入模时，下料要均匀，注意与振捣相配合，混凝土的振捣与下料交错进行；混凝土浇筑时，应防止混凝土离析，混凝土下落距离不得大于2mthethree.Third,seriouslyimplementtheCentral,provincial,municipalandCountypartyCommitteeontheestablishmentofasoundworkstyleconstructionviewsofthelong-actingmechanismandontheimplementationofthethreeSunscallsforfurtherstrengtheningofeducationadministrationandsupervisionofpartymembersandcadres,fromthe...Acceptsupervisionandearnestlygrasp,balance,twopromotion,importantjobhimself,theSecretaryofdevelopment,majorissuespersonally.5.stronglysupportsaccountabilitydisciplinediscipline.Administrativeprovisionsonstrictenforcementofpartymembersandcadrestoaskallthedisciplineinspectionandsupervisioncadresinaccordancewiththeironitselfmustbeahardrequirement,adheretotheresponsibilitiesandplay,earnestlyfulfilltheirdutiesofsupervisionandaccountabilityforZhiJI.ZhenintofullplayandtheoversightroleoftheCommission,establishandimprovethevillagerulesandcommunityconventions,promotingjointpublicandservingthesunshinepubliclyavailableimplementationoftheplatformforaction.Disciplineinhandlingcases,adheretofindalongwithscrutiny,toappointtheinterferenceandresistance,backedbycourageous,findtheproblemcorrected,powerfulmaintenancetheseriousnessofresponsibilityofuncorrupted.ActivelypromotethedisciplineCommitteedetailedswitchand,casting,tree-generatingactivities.　　Promote 。并应保持预应力预埋管道不发生挠曲或位移，禁止管道口直对腹板槽倾倒混凝土（4）灌注混凝土前应将模板内的杂物和钢筋上的油污等清除干净；在梁体混凝土灌注过程中，应指定专人检查模板、钢筋等，发现螺栓及楔子、支撑等松动应及时拧紧和打牢，钢筋和预埋件如有变化、移位应及时调整保证位置正确。当模板有缝隙和孔洞时，应予堵塞，不得漏浆。（5）在振捣混凝土时，插入式振捣器不得碰触预埋在梁体内的橡胶管和梁体钢筋，以免导致预埋管道挠曲或移位。（6）在腹板灌注过程中，应由专人用小锤敲击内模，检查混凝土是否密实，腹板混凝土灌注时应两侧同时进行，严禁单侧灌注或两侧灌注混凝土量不均匀造成内模向一边倾斜。（7）桥面混凝土应确保密实、平整、排水畅通，除按规定进行振捣外，还必须及时修整、抹平混凝土裸露面，待定浆后再抹第二遍并压光。抹面时严禁洒水，并应防止过度操作影响表层混凝土的质量。（8）当室外温度超过350C或混凝土拌合物出盘温度达到300C以上时，应按夏季施工办理，或改变混凝土灌注时间，尽量安排在上午11:00以前灌注完或下午16:00以后开盘灌注。（9）梁体泵送混凝土应连续灌注、一次成型，浇筑时间不宜超过6小时或不得超过混凝土的初凝时间；混凝土浇筑应采用水平分层、斜向分段的方法进行浇筑，分层厚度不得大于300mm。（10）在炎热季节浇筑混凝土时，应避免模板和新浇混凝土直接受阳光照射，保证混凝土的入模温度以及附近的局部气温均不超过40℃。当气温平均气温低于5℃或最低气温低于-3℃浇筑混凝土时，应采取适当的保温防冻措施，防止混凝土提前受冻。浇混凝土与邻接的已硬化混凝土浇筑时的温差不得大于15℃。6.4、混凝土振捣方法梁体腹板处的底板混凝土采用插入式振捣棒振捣。腹板混凝土采用振动棒和附着式振捣器振捣。顶板混凝土采用插入式捣固棒振捣。附着式振捣器安装在侧模外侧，交错布置呈两排，每间隔1.5mthethree.Third,seriouslyimplementtheCentral,provincial,municipalandCountypartyCommitteeontheestablishmentofasoundworkstyleconstructionviewsofthelong-actingmechanismandontheimplementationofthethreeSunscallsforfurtherstrengtheningofeducationadministrationandsupervisionofpartymembersandcadres,fromthe...Acceptsupervisionandearnestlygrasp,balance,twopromotion,importantjobhimself,theSecretaryofdevelopment,majorissuespersonally.5.stronglysupportsaccountabilitydisciplinediscipline.Administrativeprovisionsonstrictenforcementofpartymembersandcadrestoaskallthedisciplineinspectionandsupervisioncadresinaccordancewiththeironitselfmustbeahardrequirement,adheretotheresponsibilitiesandplay,earnestlyfulfilltheirdutiesofsupervisionandaccountabilityforZhiJI.ZhenintofullplayandtheoversightroleoftheCommission,establishandimprovethevillagerulesandcommunityconventions,promotingjointpublicandservingthesunshinepubliclyavailableimplementationoftheplatformforaction.Disciplineinhandlingcases,adheretofindalongwithscrutiny,toappointtheinterferenceandresistance,backedbycourageous,findtheproblemcorrected,powerfulmaintenancetheseriousnessofresponsibilityofuncorrupted.ActivelypromotethedisciplineCommitteedetailedswitchand,casting,tree-generatingactivities.　　Promote 左右安设1个，端模处各设4台附着式振动器；附着式振捣器的电路按灌注顺序分组连接，以便较好控制混凝土的振捣。6.5、混凝土振捣技术要求（1）混凝土振捣过程中，应避免重复振捣，防止过振。应加强检查模板支撑的稳定性和接缝的密合情况，防止在振捣混凝土过程中产生漏浆。（2）采用插入式振捣器振捣混凝土时，插入式振捣器的移动距离不得大于振捣器作用半径的1.5倍（约90cm），且插入下层混凝土内的深度宜为10～20cm；与侧模应保持5～10cm的距离。操作插入式振捣器时宜快插、慢拔。插入式振动器操作人员必须责任心强,按责任划分区域进行振捣,不得欠捣或过捣,绝不允许漏捣。当振捣完毕需变换振捣棒在混凝土内拌和物中的水平位置时，应边振动边竖向缓慢提出振捣棒，不得将振捣棒放在拌和物中平拖。不得用振捣棒驱赶混凝土。（3）附着式振捣器的设置间距和振动能量应能覆盖已振捣部分的边缘，并与模板紧密连接。（4）在振动过程中，应避免碰撞模板、钢筋及其预埋部件。（5）采用插入式振捣器振捣混凝土时宜采用应垂直点振方式振捣。若需变换振捣棒在混凝土拌合物中的水平位置，应首先竖向缓慢将振捣棒拔出，然后再将振捣棒移到新的位置，不得将振捣棒放在拌合物内平拖，也不得用插入式振捣棒平拖驱赶下料口处堆积的混凝土拌合物。每一振点的振捣持续时间宜为20s～30s，以混凝土不再沉落，不出现气泡，表面泛光为度，防止过振、漏振。（6）对于腹板与底板及顶板连接处的承托、倒角及预应力筋锚固区等其它钢筋密集部位，应特别注意振捣。避免因振捣不及时而导致混凝土出现空洞或蜂窝麻面。6.6、插入式振捣器安全操作规程（1）插入式振捣器电动机电源上，应安装漏电保护装置，接地应安全可靠。（2）操作人员操作振捣器作业时,应穿戴绝缘胶鞋和绝缘手套。（3）使用前应检查各部连接是否可靠，旋转方向是否正确。（4）振捣器不得在初凝混凝土、地板、脚手架、道路和干硬的地面上进行试振。thethree.Third,seriouslyimplementtheCentral,provincial,municipalandCountypartyCommitteeontheestablishmentofasoundworkstyleconstructionviewsofthelong-actingmechanismandontheimplementationofthethreeSunscallsforfurtherstrengtheningofeducationadministrationandsupervisionofpartymembersandcadres,fromthe...Acceptsupervisionandearnestlygrasp,balance,twopromotion,importantjobhimself,theSecretaryofdevelopment,majorissuespersonally.5.stronglysupportsaccountabilitydisciplinediscipline.Administrativeprovisionsonstrictenforcementofpartymembersandcadrestoaskallthedisciplineinspectionandsupervisioncadresinaccordancewiththeironitselfmustbeahardrequirement,adheretotheresponsibilitiesandplay,earnestlyfulfilltheirdutiesofsupervisionandaccountabilityforZhiJI.ZhenintofullplayandtheoversightroleoftheCommission,establishandimprovethevillagerulesandcommunityconventions,promotingjointpublicandservingthesunshinepubliclyavailableimplementationoftheplatformforaction.Disciplineinhandlingcases,adheretofindalongwithscrutiny,toappointtheinterferenceandresistance,backedbycourageous,findtheproblemcorrected,powerfulmaintenancetheseriousnessofresponsibilityofuncorrupted.ActivelypromotethedisciplineCommitteedetailedswitchand,casting,tree-generatingactivities.　　Promote （5）插入式振捣器软轴的弯曲半径不得小于50cm，并不得多于两个弯，操作时振动棒应自然垂直地沉入混凝土内，不得用力硬插、斜推或使钢筋夹住棒头，也不得全部插入混凝土中。（6）振捣器应保持清洁，不得有混凝土粘结在电动机壳上妨碍散热。（7）作业转移时，电动机的导线应保持有足够的长度和松度，严禁用电源线拖拉振捣器。（8）作业后，必须做好清洗、保养工作，振捣器要放在干燥处。（9）检修或作业间断时，应切断电源。6.7、附着式振捣器安全操作规程（1）使用前检查各部连接是否可靠。（2）在一个构件上同时使用几台振捣器工作时，振捣器的振动频率必须相同。（3）振捣器与平板保持紧固，电源线必须固定在平板上，电源开关应装在把手上。（4）操作人员必须穿绝缘胶鞋和戴绝缘手套。（5）振捣器应保持清洁，不得有混凝土粘结在电动机壳上妨碍散热。（6）作业转移时，电动机的导线应保持有足够的长度和松度，严禁用电源线拖拉振捣器。（7）作业后，必须做好清洗、保养工作，振捣器要放在干燥处。（8）检修或作业间断时，应切断电源。7、混凝土的质量检验7.1、混凝土拌制前由专业计量人员对混凝土拌合搂计量设备进行零点调整，做到混凝土配料准确。7.2、灌注混凝土时，必须用坍落度指标控制混凝土拌合物性能，前三盘均要测混凝土坍落度，待其坍落度稳定后根据肉眼观察情况进行随机测量；混凝土初凝（初凝时间由试验室根据不同气候条件下所作混凝土试验确定）之后，不得灌入梁内。thethree.Third,seriouslyimplementtheCentral,provincial,municipalandCountypartyCommitteeontheestablishmentofasoundworkstyleconstructionviewsofthelong-actingmechanismandontheimplementationofthethreeSunscallsforfurtherstrengtheningofeducationadministrationandsupervisionofpartymembersandcadres,fromthe...Acceptsupervisionandearnestlygrasp,balance,twopromotion,importantjobhimself,theSecretaryofdevelopment,majorissuespersonally.5.stronglysupportsaccountabilitydisciplinediscipline.Administrativeprovisionsonstrictenforcementofpartymembersandcadrestoaskallthedisciplineinspectionandsupervisioncadresinaccordancewiththeironitselfmustbeahardrequirement,adheretotheresponsibilitiesandplay,earnestlyfulfilltheirdutiesofsupervisionandaccountabilityforZhiJI.ZhenintofullplayandtheoversightroleoftheCommission,establishandimprovethevillagerulesandcommunityconventions,promotingjointpublicandservingthesunshinepubliclyavailableimplementationoftheplatformforaction.Disciplineinhandlingcases,adheretofindalongwithscrutiny,toappointtheinterferenceandresistance,backedbycourageous,findtheproblemcorrected,powerfulmaintenancetheseriousnessofresponsibilityofuncorrupted.ActivelypromotethedisciplineCommitteedetailedswitchand,casting,tree-generatingactivities.　　Promote 7.3、梁体混凝土在灌注过程中,从底板、腹板及顶板分别取样，随机制作混凝土强度和弹性模量试件，每次梁体混凝土灌注的试件组数每个部位10组。其中弹性模量试件2组，1组随梁养护用作终张拉弹性模量评定和1组标养用于28天的弹性模量评定；立方抗压试件8组，4组立方抗压试件标养用于28天混凝土强度评定，4组立方抗压试件随梁体养护，分别试验后作为预张拉、拆模、一期张拉、二期张拉的依据。7.4、试生产前，应进行混凝土配合比选定试验，制做抗冻性、抗渗性、抗氯离子渗透性、抗碱-骨料反映性等耐久性试件各一组，进行耐久性试验；批量生产中，预制梁每20000m3混凝土抽取抗冻融循环、抗渗性、抗氯离子渗透性、抗碱-骨料反应的耐久性试件各一组，进行耐久性试验。8、环保措施8.1为了防止粗细骨料、水泥、掺和料等的扬尘污染环境，应对以上原材料采取遮盖、密闭的措施。8.2在施工过程中，防止搅拌设备、输送设备等渗油，并对渗出的废油脂进行收集、覆盖、掩埋等妥善处理。8.3对堵塞废弃物及混凝土残浆等应按预先确定的处理方法和场所，及时进行妥善处理。8.4、混凝土搅拌污水、泥浆必须经沉淀、净化处理后方可向外排放，并定期对沉淀池清理。8.5、剩余混凝土用于地面或进场道路硬化，不得随意乱倒。thethree.Third,seriouslyimplementtheCentral,provincial,municipalandCountypartyCommitteeontheestablishmentofasoundworkstyleconstructionviewsofthelong-actingmechanismandontheimplementationofthethreeSunscallsforfurtherstrengtheningofeducationadministrationandsupervisionofpartymembersandcadres,fromthe...Acceptsupervisionandearnestlygrasp,balance,twopromotion,importantjobhimself,theSecretaryofdevelopment,majorissuespersonally.5.stronglysupportsaccountabilitydisciplinediscipline.Administrativeprovisionsonstrictenforcementofpartymembersandcadrestoaskallthedisciplineinspectionandsupervisioncadresinaccordancewiththeironitselfmustbeahardrequirement,adheretotheresponsibilitiesandplay,earnestlyfulfilltheirdutiesofsupervisionandaccountabilityforZhiJI.ZhenintofullplayandtheoversightroleoftheCommission,establishandimprovethevillagerulesandcommunityconventions,promotingjointpublicandservingthesunshinepubliclyavailableimplementationoftheplatformforaction.Disciplineinhandlingcases,adheretofindalongwithscrutiny,toappointtheinterferenceandresistance,backedbycourageous,findtheproblemcorrected,powerfulmaintenancetheseriousnessofresponsibilityofuncorrupted.ActivelypromotethedisciplineCommitteedetailedswitchand,casting,tree-generatingactivities.　　Promote'