新建铁路长春(开安)至西巴彦花铁路工程I标段冬季混凝土施工方案中铁二十三局集团有限公司长西铁路CX-I标工程项目经理部2016年4月表A.0.1施工组织设计(方案)报审表工程项目名称:新建长春(开安)至西巴彦花铁路施工合同段:CX-I标工程项目编号:致河南长城铁路工程建设咨询有限公司长西铁路监理站(项目监理机构):我单位根据承包合同的约定已编制完成冬季混凝土施工工程的施工方案,并经我单位技术负责人审查批准,请予以审查。附:冬季混凝土施工方案。施工单位(章):项目负责人(章):日期:年月日专业监理工程师意见:专业监理工程师:日期:年月日项目监理机构意见:项目监理机构(章):总监理工程师(章):日期:年月日建设单位意见:建设单位(章):负责人:日期:年月日目录1.工程概况··································································22.编制依据··································································23.施工准备··································································23.1材料备···································································23.2机具备···································································23.3人员备···································································23.4现场备···································································23.5技术备···································································34.施工方法··································································34.1混凝土的制································································4.2混凝土的输································································44.3混凝土的筑································································44.4混凝土的护································································65.混凝土的测温······························································65.1测点布置则································································65.2测温法···································································65.3测温求···································································65.4大体积混凝土养护测温记录··················································65.5混凝土拆要求······························································76.冬季施工的质量通病以及预防措施···········································86.1钢筋的锈蚀与混凝土裂缝····················································86.2结构疏散与水分转移······················································86.3表面起灰·································································86.4结晶腐蚀-混凝土表面返霜·················································87.安全技术措施······························································88.质量保证措施······························································9新建长西铁路CX-1标冬季混凝土施工方案1冬季混凝土施工方案1工程概况1.1.地理位置及线路走向(图(2)-1(1)、长春(开安)至西巴彦花铁路项目工程CX-Ⅰ标段位于吉林省,标段范围DK0+000-DK75+000(含开安站改建、开安疏解线和长白线相关工程),线路长81.715km,包含路基60.437km,占线路长度的74.3%;隧道3.64km,占线路长度的4.45%;桥梁17.638km,占线路长度的21.58%;涵洞3273.83横延米,开安车站、丁家屯车站、太平山车站、庆福公屯车站。(2)、地形条件沿线地形总体上东西高中间低,地貌形态多变,根据成因和形态分为:洪积、冲积冰水高平原区,河谷冲积平原区,丘陵状台地区,冲湖积低平原区,丘陵区5个单元。新建长西铁路CX-1标冬季混凝土施工方案2长春(开安)至西巴彦花铁路项目地理位置示意见上图(2)-1。1.2.主要技术标准(1)铁路等级:I级;(2)正线数目:单线,预留双线;(3)速度目标值:120km/h,平面预留160km/h条件;(4)最小曲线半径:一般2000m,困难1600m;(5)限制坡度:6‰,重车方向4‰;(6)牵引种类:电力;(7)机车类型:货机HXD系列,客机SS9型;(8)牵引质量:5000t,10000t;(9)到发线有效长度:1700m;(10)闭塞类型:自动站间闭塞。1.3.气象特征线路所经地区属暖温带半湿润大陆性季风气候地区。四季分明,春秋适宜,夏热多雨,冬寒干燥。年平均气温为12.5℃,极端最高气温为40℃,最热月平均气温为25.2℃。2编制依据1.《建筑工程冬期施工规程》JGJ104-972.《混凝土结构工程施工质量验收规范》GB50204-20023.《混凝土外加剂应用技术规范》GB50119-20034.《建筑施工技术》3施工准备3.1材料准备3.1.1水泥:水泥标号为P.O.42.5级的普通硅酸盐水泥。此种水泥水化热比较低,适合本工程使用。水泥进场时必须有质量证明书及复试试验报告,并对其品种、标号、包装、出厂日期等检查验收。3.1.2砂:选用质地坚硬、级配良好的中砂,含泥量不大于3%。3.1.3石子:粒径0.5~2.5cm的级配碎石,混凝土低于C30时,含泥量不大于2%。3.1.4混凝土外加剂:选用早强剂型复合防冻剂,并应有减水、引气作用,含气量应控制在2%~4%。3.2机具准备主要冬施材料情况表序冬施主要材料使用部位使用量新建长西铁路CX-1标冬季混凝土施工方案3号1聚乙烯塑料布(0.8mm厚黑色)梁、柱、板模板包裹封闭保温及板面覆盖根据工程需要进场2塑料防水彩条布各层迎风面挡风封闭根据工程需要进场3保温草袋(草帘)各层板、柱、墙保温层根据工程需要进场410号铁丝保温层封闭层用根据工程需要进场5炭盆(φ800高1000)梁板下混凝土养护前期加温根据工程需要进场6灭火器显要位置及有火源位置根据工程需要进场7块煤根据工程需要进场8温度计+100ºC~-50ºC根据工程需要购进9手电根据工程需要购进10φ25~50钢管梁、柱蒸汽法施工根据工程需要购进11φ25~50充气胶管梁、柱蒸汽法施工根据工程需要购进12锅炉设施蒸汽法施工根据工程需要购进3.3人员准备3.3.1进入冬季施工,项目部设专人负责测量温度,绘制测温点平面图,及时接收天气预报,防止突然的霜降、寒流对混凝土造成危害。现场设天气预报公布栏,并做好室内测温记录,测温工作、试验工作分别由专人负责,在冬期施工开始之前对测温人员进行培训后方可上岗工作。测温人员对每日大气温度、混凝土温度进行观测记录。测温时间和所测温度值详细记录,整理归档。冬施期间设置二名专职测温人员,分两班,7时~19时为第一班,19时~次日7时为第二班,每24小时测四次,分别在2时、8时、14时、20时。3.4现场准备3.4.1根据本工程冬期施工内容,平衡各工种冬期劳动力的配置,安排大、中型机械的使用计划。3.4.2掌握冬期施工所需各项物资的供应情况,做好物资的及时供应。3.4.3做好现场用于施工、维护、保温等设施的维护和保管工作,防止发生冻害。3.4.4施工班组要备好冬期防寒服、防寒帽、防寒手套,保证工人必须的劳保用品,以安全度过冬期。3.4.5现场周边上水管、阀门、等用岩棉做好保温工作。3.4.6清理场区道路,排除积水,做好场地积雪的清扫准备,截断流入现场的水源,严格控制临水的用水量,避免遍地结冰。3.4.7保证消防道路畅通,要及时清除建筑垃圾及废旧材料,模板及钢筋的堆放严禁占用道路。3.4.8大型机械要做好冬期施工所需油料的储备和工程机械润滑油的更换补充以及其它检修保养工作,以便在冬施期间运转正常。3.4.9木工房、钢筋加工区、简易库房等进行全面检查维修,做到不漏不塌。冬期办公室、职工宿舍及值班室取暖采用电取暖或用自建2.5t锅炉烧煤集中供暖。3.5技术准备3.5.1冬施前组织全体员工学习冬施基本知识和JGJ104-97相关内容,对负责技术、测温、养护及消防工作的专职人员进行专业技术培训,经考核及格后,安排上岗。组织人员培训掌握工作要点。新建长西铁路CX-1标冬季混凝土施工方案43.5.2了解当天天气预报和测温人员做测温报告,做出预防天气突变的防范措施。3.5.3根据混凝土养护测温记录,推算混凝土强度增长情况,决定同条件试块试压时间,混凝土拆模时间以及拆模后混凝土外表面的保温措施。3.5.4检查保温措施实施情况。3.5.5检查冬施安全措施执行情况,重点是:电气设备使用、消防安全。3.5.6对混凝土浇筑过程中和完成后的覆盖保温做详细技术交底,包括覆盖顺序、方向、覆盖物横竖的使用,以及重点部位,散热较快部位的保温方法。3.5.7检查与落实:在进入冬期施工前,对冬施的准备工作进行一次全面检查,检查物资的准备情况,人员的培训交底情况,现场准备情况及作业条件等,要严格落实冬施方案,建立检查落实方案的制度。4施工方法4.1混凝土的拌制4.1.1冬施用于搅拌混凝土的砂、石、水泥均应保持正温。采用P.O.42.5级的普通硅酸盐水泥,用暖棚存放,并不得直接接触80℃以上的热水。水泥不得直接加热。4.1.2拌制混凝土采用加热水的方法,水温不大于60℃,若达不到热工计算的要求,则采用骨料加热法,骨料的加热温度不得超过40℃,具体温度值由热工计算确定。4.1.3骨料必须清洁,不得含有冰、雪等冻结物及易冻裂的矿物质,含泥量不得超过规定值,掺含钾、钠离子早强型防冻剂时,混凝土中不得混有活性骨料。4.1.4严格控制水灰比,不得大于0.6,每立方米混凝土水泥用量不少于300kg,由骨料带入的水分及外加剂溶液中的水分均应从拌和水中扣除。4.1.5外加剂采用无盐类防冻剂,大体积混凝土加用引气剂或引气减水剂,配置防冻剂溶液要有专人负责,严