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【简答题】
某公司承包了一条跨城市隧道,隧道长度为1000米,跨度为12米,通过地段多为易塌陷的软弱围岩,设计采用浅埋暗挖法进行施工。 施工准备阶段,项目部根据该段工程地质特点确定了如下图所示的断面开挖方法,经监理批准后实施: 在暗挖支护形式上,项目部选用了架和20cm厚喷射混凝土作为初期支护;施工中需穿越一条铁路,为保证铁路正常运营和施工安全,决定使用进行超前支护,并确定施工流程如下: 测放→钻机就位→A→压入钢管→B→封口→C。 喷射混凝土施工前,项目部确定的施工方案如下: (1)喷射作业分层分段,由上而下喷射; (2)架与喷射砼形成一体,架与围岩间隙用小片石填充密实,架应全部被喷射砼覆盖。 在一个模筑段长度内灌注边墙混凝土时,施工单位为施工方便,先灌注完左侧边墙混凝土,再灌注右侧边墙混凝土。 【问题】 1.请指出图中的开挖方式名称及第“4”、“5”的名称。 2.请将施工流程中A、B、C补充完整。 3.背景资料中喷射混凝土作业人员的做法不正确,请改正。 4.背景资料中边墙灌注施工错误,写出正确的做法。
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