The utility model relates to the field of tunnel construction technology, in particular to a construction structure for reducing the risk of double shield TBM cards. A construction auxiliary hole is added to the left and/or right side of the main TBM tunnel near the crushed area, and the two ends of the construction auxiliary hole are connected with the main TBM tunnel; a belt conveyor A is installed in the construction auxiliary tunnel, and the two ends of the belt conveyor A are connected with the belt conveyor B in the main TBM tunnel. Meet. The utility model adds a construction auxiliary tunnel and places a belt conveyor in the construction auxiliary tunnel to form a plurality of transmission channels, greatly improves the ability of transporting crushed slag, so that a large amount of crushed slag produced by the crushing of the face of the face of the TBM can be discharged as soon as possible when it passes through the surrounding rock of the fault fracture zone area, solves the problem of insufficient torque caused by the failure to discharge slag in time, and prevents the TBM cutter head from being stuck in operation At the intersection of auxiliary tunnel and main tunnel of TBM, shotcrete and bolt support and steel support are used, and grouting is used to control the large convergence displacement of broken rock mass caused by TBM excavation, so as to prevent the TBM shield from being stuck.
【技术实现步骤摘要】
一种降低双护盾TBM卡机风险的构建结构
本技术涉及隧道施工
,尤其涉及一种降低双护盾TBM卡机风险的构建结构。
技术介绍
全断面岩石掘进机(TBM)以其快速、优质、高效、安全、环保、自动化等优点,近年来广泛应用于深埋长大隧道工程中。双护盾TBM是全断面岩石掘进机的一种,其主体结构除了刀盘外全部被两个护盾包围,护盾可分为前护盾、伸缩护盾、支撑护盾以及尾盾。地质情况较好时,TBM前进时的支反力由支撑靴承受;地质情况较差时,支撑靴收回,形成一个护盾,此时推进液压缸顶在管片上前进。其既可应用于硬岩,也可应用于软岩,同时还可在软硬岩交错地带掘进。此外,双护盾TBM的掘进和管片施作是同步进行的,所以其掘进效率要高于单护盾TBM。但当围岩较差,尤其当隧道穿越破碎岩体区域时,破碎围岩会在滚刀切削力作用下产生掉块,但破碎的掌子面围岩大块坍塌导致皮带运输机无法以指定运输速率将碎岩运出,此时TBM刀盘的脱困扭矩小于岩体与刀盘的摩擦力,从而导致刀盘被卡;另一方面,破碎岩体区域受到扰动后周边围岩收敛变形过快,塑性变形发展过快,在管片还未施作时,围岩的径向位移会大于护盾与开挖面之间的预 ...
【技术保护点】
1.一种降低双护盾TBM卡机风险的构建结构,其特征在于:临近破碎区域处的TBM主洞的左侧和/或右侧增设有一施工辅助洞,施工辅助洞的两端与TBM主洞连通;施工辅助洞中设有皮带运输机A,皮带运输机A的两端与TBM主洞中的皮带运输机B会合。
【技术特征摘要】
1.一种降低双护盾TBM卡机风险的构建结构,其特征在于:临近破碎区域处的TBM主洞的左侧和/或右侧增设有一施工辅助洞,施工辅助洞的两端与TBM主洞连通;施工辅助洞中设有皮带运输机A,皮带运输机A的两端...
【专利技术属性】
技术研发人员:夏炜洋,张志强,曾博文,何磊,陈强,
申请(专利权)人:中铁二局集团有限公司,
类型:新型
国别省市:四川,51
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