上跨古身公路分离式立交桥施工方案.pdf

1中山市神湾大桥扩建工程中山市神湾大桥扩建工程上跨古神公路分离式立交桥施工方案上跨古神公路分离式立交桥施工方案（zK0+543.5）中山市神湾大桥扩建工程项目经理部中山市神湾大桥扩建工程项目经理部2目录目录第一章、工程概况第一章、工程概况····························································································································4第二章、施工方案第二章、施工方案····························································································································5一、工程重点······························································································································ 5二、1#墩施工方案······················································································································ 53、桥台施工方案······················································································································ 304、小箱梁预制和架设施工方案······························································································ 305、湿接缝、桥面系、防撞墙施工方案。

·············································································· 45第三章、交通疏导和围蔽方案第三章、交通疏导和围蔽方案·····································································································461、交通组织原则······················································································································ 462、具体方案······························································································································ 46第四章、工期计划、施工队伍和劳动力安排第四章、工期计划、施工队伍和劳动力安排···········································································54一、工期计划···························································································································· 54二、施工队伍和劳动力安排···································································································· 55第五章、物资供应和机械设备配置计划第五章、物资供应和机械设备配置计划····················································································55一、物资供应计划···················································································································· 55二、机械设备计划···················································································································· 56第六章、安全和质量、环保保证措施第六章、安全和质量、环保保证措施························································································57一、安全保证措施···················································································································· 573二、质量保证措施···················································································································· 58三、环保保证措施···················································································································· 584第一章、工程概况第一章、工程概况上跨古神公路分离式立交桥为跨越古神公路而设计，桥梁全长 66 米。

全桥有 3 个墩台，0#和 2#桥台位于古神公路两侧，1#墩位于古神公路中央绿化带里，分别在园曲线和缓和曲线上上部结构设计为两跨 25 米小箱梁下部结构设计为：0#和 2#桥台为扩大明挖基础加 U 型桥台、1#墩为钻孔灌注桩基础加圆柱式桥墩带盖梁位于既有桥梁左侧桥梁中心桩号 zk0+543.0 ，与古神公路斜交左偏 28相交处古神公路的里程为 k42+400,主要工程数量有：主要工程数量表 名称单位数量备注 桥台基础混凝土M3619.9 台身混凝土M31194 帽梁混凝土M394.4 桩基混凝土M379.48 墩柱混凝土M318.1 盖梁混凝土M353.9 预制小箱梁M3356.4 钢筋吨2515第二章、施工方案第二章、施工方案一、工程重点一、工程重点上跨古神公路分离式立交桥跨越古神公路， 古神公路为双向四车道一级公路，车流量大， 施工时如何保证古神公路交通顺畅和行车安全、 是本工程施工的重点将在下一章详细叙述二、1#墩施工方案二、1#墩施工方案1#墩位于古神公路中央分隔带里， 施工时首先按照交通疏导方案 1 做好交通疏导和围蔽，经交通主管部门检查验收合格后方能开工1#墩设计有三根直径 1.5 米钻孔灌注桩，拟投入 1 台冲击钻来施工。

混凝土采用导管灌注法施工现场设一临时存贮泥浆池，配一台移动泥浆车，沉渣和富余泥浆拉至场外存贮和晾晒圆形墩柱采用整体钢模板，一次浇注成型盖梁采用包箍法施工，混凝土浇筑一次成型1、 桩基施工方案A、测量放样A、测量放样桩基施工前，已对图纸桩位坐标及高程逐个进行检查校对，在图纸校对无误后， 根据甲方提供的控制点及我项目部加密闭合的控制点用全站仪测定出各桩位的中心位置， 并已在各桩位的四周设立 4 个护桩， 便于随时检查桩位的中心位置，及时测定出护筒顶标高，严格控制高程，施工时，进行跟踪测量，并报测量监理工程师验收认可各道工序的测量资料需认真做好记录，所有测量成果及时申报给监理工程师审核批复6冲孔桩施工步骤图如下：B、埋设护筒B、埋设护筒护筒采用 8mm 钢板卷制而成，直径大于设计桩径 20-30cm护筒底穿过填土层进入粘土 1.5m，顶部高出地面 30cm护筒埋设工作是钻孔灌注桩施工的开始，护筒平面位置与竖直度准确与否，护筒周围和护筒脚底是否紧密、不透水，对成孔、 成桩的质量都有重大影响 埋设时， 护筒中心轴线应对正测量标定的桩中心，其偏差不得大于 5cm，竖直线偏差不大于 1%在埋护筒时，先在桩位处挖出比护筒外径大 80cm~100cm 的圆坑。

然后在坑底填筑 50cm 左右厚的粘土,分层夯实,以备安设护筒在粘土中挖埋时,坑的直径与上述相同,找出护筒的圆心位置,用十字线定在护筒顶部或底部,然后移动护筒,使护筒中心与钻孔中心位置重合 水平尺或垂球检查,使护筒竖直此后即在护筒周围对称、均匀地回填最佳含水量的粘土要分层夯实，达到最佳密实度夯填时要防止护筒偏斜护筒的内径需比桩径大 20～40cm，护筒埋深根据桩基所处位置的地质情况而定，一般埋深宜为 2～4m，需高出施工地面不少于 0.3m，并应采取稳定护筒内水头的措施3.浇注钻孔桩砼换浆、移开钻机步骤二：1.钻至设计标高后，清孔、混凝土罐车钻机地面钢护筒泥浆池地面桩基础施工步骤一：1.平整场地，桩位放线 2.布设泥浆池，埋设钢护筒3.钻机就位钻孔导管钢筋笼广东惠州公路建设总公司2.吊放钢筋笼桩基础施工步骤7沉淀池设置：用挖土机挖掘 3 级沉淀池，且用采条布垫好，并用砂包围好，防止泥浆外渗污染环境桩基钻孔施工完毕，用汽车将泥浆外运至环保单位指定地点弃置C、桩机就位C、桩机就位桩机在就位前要检查钻头，其钻头直径不得小于桩径桩机采用拖拉就位，人工配合用枕木垫稳，且作业台需平稳，桩基就位后要栓好缆风绳。

并根据测量好的四个护桩将冲击锥的钢丝绳校正于桩位中心拼装好的钻机拖拉就位后，将钻头对准钻孔桩位，并与钻架上的起吊滑轮在同一铅垂线上中心成一直线，其偏差小于 2cm钻机定位后，底座做到平整、稳固，确保在钻进中不发生倾斜和位移D、拌制泥浆D、拌制泥浆 （一）泥浆的备制泥浆是用以水化快、造浆能力强、粘度大的膨润土或接近地表经过冻融的粘土为材料，但应尽量就地取材制浆前，应先把粘土块尽量打碎，使在搅拌中易于成浆，缩短搅拌时间，提高泥浆的质量在粘土地层中钻进，可先采用清水护壁，待陆续钻进时，孔内的清水同钻锥切削下来的粘土，在钻锥冲击搅动下，自然形成泥浆但如粘土含砂多，则这样制成的泥浆质量可能不符合要求，需要加以净化改进若粘土层很厚，泥浆中的粘土含量将逐渐增加，故在钻进中，要及时加水稀释泥浆，使它符合要求的相对密度、粘度和其它性能指标制出的泥浆可贮于它处备用冲击钻头搅拌时，将粘土原料投入孔底，利用钻头上下冲击，搅拌成泥浆二）泥浆的性能要求泥浆的循环系统和净化系统，项目部决定设置泥浆池，贮浆池，沉淀池，并用泥浆槽连接，尺寸为 3×8m，深 1m，外周挖一条环流沟，避免对周围的污染，一套循环系统，可供 1-2 个桥墩使用，制浆池周围作好防护设施。

根据钻孔方法和土层情况， 调制的钻孔泥浆及经过循环净化的泥浆性能指标可参考下表：8泥浆性能指标选择钻孔 方法地层 情况泥浆性能指标相对密度粘度 (Pa° s)含砂 率 (％)胶体率 (％)失水率 (ml／ 30min)泥皮厚 (mm/30m in)静切力 (Pa)酸碱度 (pH)正循环一般地层 易坍地层1.05～ 1.20 1.20～ 1.4516～22 19～288～4 8～4≥96 ≥96≤25 。