地铁车站附属结构工程中的清障施工技术
史力汪杰
Barrier Clearing Technology for Metro Station Auxiliary Structure Construction
SHI LiWANG Jie
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作者信息:无锡地铁建设有限责任公司，214021，无锡
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Affiliation:Wuxi Metro Construction Co., Ltd.， 214021， Wuxi, China
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关键词:
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Key words:
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DOI:10.16037/j.1007-869x.2024.06.042
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中图分类号/CLCN:TU94+3∶U231.3
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栏目/Col:施工技术
摘要:
［目的］随着城市地铁建设施工技术的不断提高，地铁车站附属结构距离既有建（构）筑物越来越近，既有建（构）筑物用于边坡支护的土钉及锚杆不可避免地与附属围护结构在空间上存在冲突。因此，需选择合理清障施工技术方案，清除现有障碍物，确保附属围护结构顺利施工。［方法］根据城市地铁车站附属结构施工中清障工程经验及现状调查研究，总结了土钉及锚杆的常用清障技术，结合土钉及锚杆的主要清障技术提出了4种地铁车站附属结构施工的清障施工技术方案，并结合工程实际从清障施工技术方案的优缺点、造价、工期、成桩质量及安全等方面对附属结构施工的清障施工技术方案进行了对比分析。［结果及结论］经工程现场实施，全回转清障技术的施工功效高，其采用钢套筒护壁时的成桩质量好，基坑开挖后SMW(型钢水泥土搅拌)桩止水效果较好，基坑变形均在监测可控范围。因此，地铁附属结构工程中清障施工采用全回转清障+SMW桩的施工技术方案，可取得较好的工程实施及经济效果。
Abstracts:
［Objective］ With continuous improvement of urban metro construction technology, the auxiliary structures of metro stations are getting closer to the existing buildings or structures, and the soil nails and anchor rods used for slope support of the existing buildings or structures unavoidably conflict in space with the auxiliary enclosure structure. Therefore, it is necessary to choose a proper barrier clearing technology scheme to remove the existing barriers and ensure smooth construction of the auxiliary enclosure structure. ［Method］ Based on the experience and current situation investigation of the barrier clearing in the construction of urban metro station auxiliary structures，the commonly used barrier clearing technologies against soil nails and anchor rods are summarized. Four barrier clearing schemes for metro station auxiliary structure construction are put forward in combination with the main barrier clearing technology against soil nails and anchor rods. Combined with the engineering practice, the 4 schemes are compared and analyzed from the aspects of their advantages and disadvantages, cost, construction period, pile quality and safety, etc.［Result & Conclusion］ On-site implementation in the project shows that the full rotation barrier clearing is more effective, and with the steel sleeve wall protection, the pile quality is good. With the good waterproof effect of SMW (soil mixed wall) pile in foundation pit excavation, all deformations of the foundation pit can be within the controllable monitored range. Therefore, in the construction of the metro auxiliary structure, using the construction technology scheme of the full rotation barrier clearing and SMW pile can achieve relatively good engineering and economic results.
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