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1、兰新铁路第二双线（新疆段）LXTJ4标段重力式挡土墙施工作业指导书重力式挡土墙施工作业指导书1、目的明确重力式挡土墙施工工艺、操作要点和相应的工艺标准，指导、规范挡土墙工程施工。2、编制依据《高速铁路路基工程施工技术指南》铁建设[2010]241号《铁路混凝土工程施工技术指南》铁建设[2010]241号《高速铁路路基工程施工质量验收标准》TB10751-2010《铁路混凝土施工质量验收标准》TB10424-20103、适用范围中铁四局兰新铁路第二双线LXTJ4标三工区三项目队重力式挡土墙工程施工。4、重力式挡土墙的技术要求4.1重力式挡土墙的一般规定（1）挡土墙所用片石、水泥、粗骨料、细
2、骨料、矿物掺合料、外加剂、钢筋等材料的品种、规格、质量应符合设计要求。施工所用混凝土应用机械拌和，不得直接在现场人工拌和。（2）基坑开挖时应采取临时支护措施保持边坡稳定。基坑开挖较深、边坡稳定性较差时，应分段跳槽开挖，并及时灌注基础混凝土封闭。（3）基坑开挖过程中应避免对墙趾处持力岩土层的扰动，并避免雨水浸泡基坑。（4）明挖基坑开挖底面应完整，无损伤、无浮渣。台阶的平、立面应平顺，斜面基底应平整、无贴补。（5）明挖基坑底面地基承载力应符合设计要求。首段基坑地基承载力应经设计、施工、监理三方共同检验合格后方能进入下到工序施工。ConferenceisbyCouncilpartyresear
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