【摘 要】
：
随着城市地下空间开发与建设的普及,地下工程交叉碰撞的现象屡见不鲜,长距离隧道开挖必然存在转角暗折。90°转角暗折设计通常采取增加竖井或加高隧道断面的施工方法,这些方
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随着城市地下空间开发与建设的普及,地下工程交叉碰撞的现象屡见不鲜,长距离隧道开挖必然存在转角暗折。90°转角暗折设计通常采取增加竖井或加高隧道断面的施工方法,这些方法既增加工期又提高成本,且还存在一定的安全质量风险,采取90°平转角施工方法可以轻松解决以上状况。结合工作经验,以西南热电中心配套热力管线工程(草桥电厂—柳村路)为例,介绍了在热力大断面隧道暗挖施工中90°平转角施工方法的应用。
With the popularization of the development and construction of urban underground space, the phenomenon of cross-collision of underground engineering is not uncommon, and the turning angle of long-distance tunnel excavation inevitably exists. The 90 ° corner dark-fold design usually adopts the construction method of increasing the shaft or raising the cross-section of the tunnel. These methods not only increase the construction period but also increase the cost, but also have some safety and quality risks. The above situation can be easily solved by adopting a 90 ° rotation angle construction method. Combining with the working experience, this paper introduces the application of the construction method of 90 ° turning angle in the tunneling of large thermal large section tunnel with the example of the heat pipeline project (Caoqiao Power Plant - Liucun Road) of Southwest Thermal Power Center.
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