地下高压电缆跨越地铁基坑原位保护研究
王崇康1李永全1杨朋2王晓然1赵品祥2
In-situ Protection of Underground High-voltage Cable Crossing Metro Foundation Pit
WANG Chongkang1LI Yongquan1YANG Peng2WANG Xiaoran1ZHAO Pinxiang2
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作者信息:1.广东顺德电力设计院有限公司，528300，佛山
2.中铁二院工程集团有限责任公司，610031，成都
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Affiliation:1.Guangdong Shunde Electric Power Design Institute Co., Ltd., 528300, Foshan, China
2.China Railway Eryuan Engineering Group Co., Ltd., 610031, Chengdu, China
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关键词:
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Key words:
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DOI:10.16037/j.1007-869x.2024.07.057
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中图分类号/CLCN:TU753；U231
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栏目/Col:应用技术
摘要:
［目的］随着地下工程的增多，越来越多的工程采用原位保护技术解决改迁城市地下高压电缆带来的各种问题，因此有必要对地下高压电缆跨越地铁基坑原位保护进行研究。［方法］以佛山地铁2号线一期工程某地铁车站为例，分析了当220kV高压电缆跨越地铁基坑时，不需特殊工艺就能实现围护结构封闭的原位保护方法。介绍了管线与围护结构交叉处的原位保护措施，以及基坑内管线的原位保护措施及计算方法。通过施工及现场实施效果，验证所提原位保护方法的有效性。［结果及结论］地下电缆与围护结构相交处的原位保护是重中之重，其原位保护措施直接影响基坑安全。当地质条件较好时，地下电缆与围护结构相交处可不施作围护结构，在基坑开挖前可采用旋喷桩、MJS(全方位高压旋喷)桩或注浆措施对坑外地层进行加固改良，并在基坑竖向开挖过程中在围护结构缺口处逆筑混凝土挡板。对于地下电缆在基坑内的原位保护，可根据受力计算设置诸如贝雷架的悬吊保护措施。对于跨度较大的基坑,可在基坑中部设置临时立柱进行减跨。
Abstracts:
［Objective］ With the increase in underground engineering projects, more and more projects are adopting in-situ protection technology targeting the issues caused by relocating urban underground high-voltage cables. Therefore, it is necessary to study the in-situ protection of underground high-voltage cables crossing metro foundation pit. ［Method］ Taking a metro station of Foshan Metro Line 2 Phase I project as example, the in-situ protection method of closing the enclosure structure without special techniques is analyzed when 200 kV high-voltage cables crossing the metro foundation pit. The in-situ protection measures at the intersection of pipelines and enclosure structure are introduced, along with the in-situ protection measures and calculation methods for pipelines within the foundation pit. The effectiveness of the proposed protection method is verified through construction and on-site implementation. ［Result & Conclusion］ Due to the significant impact on the safety of foundation pit, the in-situ protection at the intersection of underground cables and the enclosure structure is of utmost importance. When geological conditions are favorable, the enclosure structure construction is unnecessary at the intersection of underground cables and enclosure structure. Prior to foundation pit excavation, reinforcement and improvement measures such as jet grouting piles, MJS (metro jet system) piles, or grouting can be applied to surrounding strata. Concrete baffles can be constructed reversely at the gap of the enclosure structure during foundation pit vertical excavation process. In-situ protection of underground cables within the foundation pit can adopt suspension protection measures such as Bailey frame based on stress calculations. For foundation pit with a larger span, temporary columns can be installed in the middle of the foundation pit for span reduction.
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