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ndoverallleadershipresponsibilityforsafety.AdministrativeDeputyiswithinthescopeoftheirrespectiveresponsibilitiesatvariouslevelsofsecurityresponsibility,inchargeofsecurityworkinthecontextofleadership,responsibletotheChief.Fifthopenpitproductionsafetyaccidentinvestigationsystem,performedonaproductionsafetyaccident\ctionsafetyaccidentreportstepbystepreportingthreechannels,namely,UnitChief,administrationandsafetysupervisionsystemcounterparttosuperiorleadership,reportsinatimelymanner.Sixthpitmustimplementthe\nchargeofwho'sincharge\besafe\nning,layout,checkproductionwork,summarizedandevaluatedatthesametime,plans,features,review,summary,ratingsafetywork.Firmlyestablishing\ness,safetyisthecredibility,safetyisthecompetitiveness\ss,tomakesafetywork.Seventhminingtradeunionorganizationaccordingtolawtheworkerstoparticipateintheworksafetyofdemocraticmanagementanddemocraticsupervision,safeguardworkers'legitimaterightsandinterestsinrespectofsafety.PersonaldeathandaTradeUnionhastherighttoparticipateinthemajoraccidentinvestigations,relyonthemassestodoproductionsafetywork.Eighthpitmustbebasedonrelevantlawsandregulations,industrystandardsandcompanyandGod'sstandards,rulesandregulationsissuedbythecompany,developingrulesandregulationsforcoalproduction,institutionalizationan墩柱施工方案
一、施工方案
1、测量放样
利用在本桥建立的导线测量控制网,采用全站仪放出每根立柱的四个角,依据放样点确定出准确的轮廓线,并将轮廓线范围内的混凝土在浇筑承台时就进行拉毛处理,在立模之前先用水冲洗净。
2、脚手架搭设
在钢筋安装及墩身模板安装前,采用Φ50mm钢管及相应的扣件进行桥墩井加式支撑平台的搭设。横向相邻的桥墩相互连接形成整体搭设支撑,并按2m设置一层作业平台,各墩作业平台保持在同一水平面上并相互连通,并根据实际情况增加剪刀形支撑,底层立撑增加斜撑,以增强井架支撑平台稳定性(支架搭设见下图)。
斜撑支架剪刀撑支架井字固定架斜撑支架支架立柱斜撑支架旋转扣说明:图中尺寸均为m.支架平面图
支架侧面图ndoverallleadershipresponsibilityforsafety.AdministrativeDeputyiswithinthescopeoftheirrespectiveresponsibilitiesatvariouslevelsofsecurityresponsibility,inchargeofsecurityworkinthecontextofleadership,responsibletotheChief.Fifthopenpitproductionsafetyaccidentinvestigationsystem,performedonaproductionsafetyaccident\dentreportstepbystepreportingthreechannels,namely,UnitChief,administrationandsafetysupervisionsystemcounterparttosuperiorleadership,reportsinatimelymanner.Sixthpitmustimplementthe\nchargeofwho'sincharge\besafe\nning,layout,checkproductionwork,summarizedandevaluatedatthesametime,plans,features,review,summary,ratingsafetywork.Firmlyestablishing\ectiveness,safetyisthecredibility,safetyisthecompetitiveness\ss,tomakesafetywork.Seventhminingtradeunionorganizationaccordingtolawtheworkerstoparticipateintheworksafetyofdemocraticmanagementanddemocraticsupervision,safeguardworkers'legitimaterightsandinterestsinrespectofsafety.PersonaldeathandaTradeUnionhastherighttoparticipateinthemajoraccidentinvestigations,relyonthemassestodoproductionsafetywork.Eighthpitmustbebasedonrelevantlawsandregulations,industrystandardsandcompanyandGod'sstandards,rulesandregulationsissuedbythecompany,developingrulesandregulationsforcoalproduction,institutionalizationan4、墩柱钢筋制作安装
⑴ 钢筋下料及加工在钢筋加工场制作成型,然后运至现场安装。桥墩立柱钢筋笼的绑扎在万能杆件支架顶操作平台上进行,先在操格平台上绑扎好上口样钢筋,以防柱子钢筋偏移造成模板无法校正或钢筋保护层过小。
⑵ 钢筋加工前必须调直及除锈,钢筋调直和清除污锈应符合下列要求:
1) 钢筋表面应洁净、无油渍、漆皮、鳞、锈等;
2) 钢筋应平直,无局部弯折,成盘的钢筋和弯曲的钢筋均应调直。 3) 采用冷拉方法调直时,Ⅰ级钢筋的冷拉率不宜大于2%;HRB335、
HRB400、牌号钢筋的冷拉率不宜大于1%。
4) 钢筋的弯制和末端的弯钩应符合设计和现行的规范要求。 ⑶ 钢筋接长时,钢筋焊接点的位置应错开50d(1.25m),保证同一截面的主筋接头不超过50%。主筋直径为25mm,采用双面焊进行焊接,搭接长度不小于5d(d为钢筋直径)。使用材质高的电焊条(5字头开头的焊条),焊接时要求焊缝密实、光滑、无气孔及焊渣 。 ⑷ 主筋安装到位后,再根据施工设计图在主筋上划出箍筋位置,然后依据划出的箍筋位置将箍筋安装好 。 5、墩柱模板
⑴ 桥墩模板采用厂制大平面刚度、强度符合设计要求的组合模板,具有装拆容易、施工操作方便、安全可靠等优点。钢模板运至施工现场后进行修整和除锈、打磨工作,涂刷脱模剂后才能进行安装使用。
ndoverallleadershipresponsibilityforsafety.AdministrativeDeputyiswithinthescopeoftheirrespectiveresponsibilitiesatvariouslevelsofsecurityresponsibility,inchargeofsecurityworkinthecontextofleadership,responsibletotheChief.Fifthopenpitproductionsafetyaccidentinvestigationsystem,performedonaproductionsafetyaccident\dentreportstepbystepreportingthreechannels,namely,UnitChief,administrationandsafetysupervisionsystemcounterparttosuperiorleadership,reportsinatimelymanner.Sixthpitmustimplementthe\nchargeofwho'sincharge\besafe\nning,layout,checkproductionwork,summarizedandevaluatedatthesametime,plans,features,review,summary,ratingsafetywork.Firmlyestablishing\ness,safetyisthecredibility,safetyisthecompetitiveness\ss,tomakesafetywork.Seventhminingtradeunionorganizationaccordingtolawtheworkerstoparticipateintheworksafetyofdemocraticmanagementanddemocraticsupervision,safeguardworkers'legitimaterightsandinterestsinrespectofsafety.PersonaldeathandaTradeUnionhastherighttoparticipateinthemajoraccidentinvestigations,relyonthemassestodoproductionsafetywork.Eighthpitmustbebasedonrelevantlawsandregulations,industrystandardsandcompanyandGod'sstandards,rulesandregulationsissuedbythecompany,developingrulesandregulationsforcoalproduction,institutionalizationan 脱模剂必须采用正规厂家产品,严禁使用废机油等 。
⑵ 安装模板前,应放出桥墩大样,并做出立模样架,校正点位,准确定位模板位置,保证墩身钢筋保护层符合设计要求,并用垂线校正墩模的垂直度 。
⑶ 模板安装必须将所有配扣件上齐。需在找平的拉毛的承台上抹一层砂浆后,再将第一节模板安装上去,坐浆挤紧,保证桩基与模板间接缝密实以防浇筑砼时漏浆 。 6、混凝土浇筑
⑴ 浇筑桥墩混凝土前应对钢筋保护层厚度和墩身纵轴进复测。并对模板、钢筋、预埋件,以及各种机具、设备进行检查,各项条件符合要求,各项准备工作安排就绪并经监理同意后,才能浇筑混凝土 。 ⑵ 混凝土采用自拌混凝土,砼运输采用混凝土罐车,混凝土吊斗分次送入模板,振捣采用插入式振动器捣固 。
⑶ 为保证砼不溅到上部模板上及不产生离析,砼通过导管下到模板内。然后用人工入模捣固。墩身顶面要用水平仪控制标高,一般浇筑的混凝土都会高出设计立柱顶10cm左右,以便在浇注盖梁前凿出新鲜混凝土,更好的和盖梁连接。
⑷ 浇筑砼时,采用水平分层浇筑,浇筑上层砼时,应在下层砼初凝或能重塑前浇筑完成。捣固时振动器移动间距不超过振动器作用半径的1.5倍,与侧模保持50~100mm的距离,插入下层砼50~100mm,每一处振毕,边振动边徐徐提出振动棒,应避免振动棒碰撞模板及钢筋。 ⑸ 每一振动部位必须振动到该部位混凝土密实为止,即混凝土停止
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