地铁2号线锚索施工方案

成都地铁2号线二期工程（西延伸线）土建1标西区站锚索施工专项方案编制：审核：审批：中铁二局股份有限公司成都地铁2号线二期工程西延伸线土建1标项目经理部2011年1月2日目录1、编制依据·································································································-1-2、工程概况·································································································-1-2.1工程位置····························································································-1-2.2工程设计简况······················································································-1-2.3工程地质····························································································-2-2.4水文地质···························································································-2-3、施工安排·································································································-2-3.1施工进度安排······················································································-2-3.2劳动组织及责任分工············································································-3-4、施工准备·································································································-3-4.1技术准备····························································································-3-4.2机具准备····························································································-3-4.3材料准备····························································································-4-5、主要施工方法及措施··················································································-4-5.1钻孔··································································································-5-5.2锚索制安····························································································-5-5.3锚孔注浆····························································································-6-5.4锚座制安····························································································-6-5.5抗拔试验····························································································-7-5.6锚索张拉锁定······················································································-8-5.7锚孔验收封锚······················································································-8-6、质量、安全、环境保证措施·······································································-10-6.1质量保证措施····················································································-10-6.2安全保证措施····················································································-11-6.3环境保护措施····················································································-13-成都地铁2号线二期工程西延伸线土建1标西区站锚索施工专项方案-1-西区站锚索施工专项方案1、编制依据1、《西区站围护结构》设计图2、《岩土锚杆(索)技术规程》CECS22_20053、《建筑基坑支护技术规范》4、《成都地区建筑地基基础设计规范》5、《预应力混凝土用钢绞线》（GB/T5224-2003/XG1-2008）2、工程概况2.1工程位置西区站位于犀浦站与外语学校站之间，车站主体位于银河西路路面下，车站两端为明挖隧道区间，沿南北向布置。2.2工程设计简况西区站为地下单层四跨侧式站台车站，起讫里程为YDK15+904.000～YDK16+140.000，总长236m。局部地段开挖深度15.6m，挖方量164537m³。车站围护结构大部分均采用土钉墙支护；在轨排井位置、风道口（周边有建筑物）及局部位置采用桩+锚索支护。桩+锚索支护主要技术参数：人工挖孔桩φ1.0m（轨排井处φ1.2m），中心距2.0m；竖向采用2道锚索，每道采用3Φ15.2钢绞线，水平间距2.0m；桩间锚喷支护，挂网HPB235，Φ6.5@150×150，喷射混凝土等级C20，结构与桩间采用M10水泥砂浆砌MU15页岩标砖回填，桩的嵌固深度为3.5m。图2-1间距1m桩锚索支护示意图图2-2间距1.2m桩锚索支护示意图成都地铁2号线二期工程西延伸线土建1标西区站锚索施工专项方案-2-2.3工程地质路段区所处地貌单元为岷江水系Ⅰ级阶地。场地地层情况由上至下主要表现为：杂填土、素填土、细砂土、含土卵石。场地孔隙水对混凝土无结晶类、分解类、结晶分解复合类腐蚀性。本道路所属场地为稳定地块，按7度抗震设防，设计基本地震加速度值为0.1g。拟建路段区存在可液化细砂土，为建筑抗震不利地段。2.4水文地质根据区域水文地质资料，成都地区丰水期一般出现在7、8、9月份，枯水期12、1、2月份，以8月份地下水位埋深最浅，其余月份为平水期。在天然状态下，区内枯水期地下水位埋深3.0～5.0m；洪水期地下水埋深2.5～4.0m。根据区内地下水位动态长期观测资料，在天然状态下，水位年变化幅度一般在1.0～3.0m之间。3、施工安排3.1施工进度安排施工部位桩号道序钻孔及注浆张拉开始日期结束日期开始日期结束日期1-5轴C1-C21第一道2011.1.252011.1.272011.2.142011.2.18第二道2011.2.32011.2.52011.2.172011.2.20第三道2011.2.102011.2.122011.2.272011.3.1212-14轴D22-D30第一道2011.1.102011.1.122011.1.272011.1.29第二道2011.1.152011.1.172011.2.32011.2.5轨排井处E31-E70第一道2011.2.12011.2.32011.2.182011.3.5第二道2011.2.92011.2.112011.2.262011.2.1317-21轴C71-C93第一道2011.2.12011.2.32011.2.182011.2.20第二道2011.2.82011.2.102011.2.252011.3.121轴以上A94-A108第一道2011.2.72011.2.82011.2.232011.3.10第二道2011.2.142011.2.152011.2.282011.2.29表3-1施工进度安排成都地铁2号线二期工程西延伸线土建1标西区站锚索施工专项方案-3-3.2劳动组织及责任分工经理部现场管理负责人：田锦明、白小可劳务现场管理负责人：熊斌4、施工准备4.1技术准备1、工程部所有技术人员，根据设计单位提供的施工设计图进行详细认真审核，然后的图纸中存在的问题进行汇总，在设计交底时让设计院进行一一解答。2、项目总工程师组织工程部的技术人员认真学习施工当中所涉及到的规范和规程。3、根据施工图设计，及时收集施工时采用的技术资料。4、逐层做好技术交底工作，让参与施工的所有人员必须明白设计意图，做到心中有数。4.2机具准备根据设计和施工进度的要求，西区站锚索施工的机械及相关设备配备，具体安排见表4-1。序号机械名称规格单位数量备注1锚固钻机YG-80型台22空压机/台23潜孔冲击器/根204跟管钻具QCW130套2偏心式5跟管套管/节206拔管机YB-30台17搅拌机/台18注浆机/台19千斤顶YDC200-100台210切割机XCJ-300台211电焊机/台2表4-1锚索施工机械及设备成都地铁2号线二期工程西延伸线土建1标西区站锚索施工专项方案-4-4.3材料准备序号名称规格数量单位1钢绞线1×7-φ15.28200m2工字钢工28a902m3OVM锚具M15-3197套4钢板20mm厚164m²5钢板10mm厚82m²6角钢∟80×8262m7角钢∟100×10492m8膨胀螺栓M25L=200788个9垫圈GB95-85M253148个10螺母GB41-86M251575个表4-2锚索施工材料表5、主要施工方法及措施预应力锚索施工主要包括施工准备、钻孔、锚索制安、锚孔注浆、锚座制安、锚孔张拉锁定和验收封锚等工作流程。其中有两个主要环节，一是锚孔成孔，锚孔成孔的技术关键是如何防止孔壁坍塌、卡钻；二是锚孔注浆，注浆的技术关键是如何将孔底的空气、土沉渣和地下水体排出孔外，保证注浆饱满密实。钻孔锚索制安锚孔注浆锚座制安抗拔试验张拉锁定验收封锚钻孔检查锚索检查设备标定报检验收报检验收报检验收合格反馈数据成都地铁2号线二期工程西延伸线土建1标西区站锚索施工专项方案-5-5.1钻孔按照设计桩号采用拉线尺量，结合水准测量进行放线，并用铁钎和油漆标记准确定位锚孔位置。钻机严格按照设计孔位、倾角和方位准确就位，采用测角量具控制角度，钻机导轨