摘要
使用盾构法在城市中心修建地铁时,常面临地面空间不足,无法提供充足的工程场地进行常规盾构接收的问题,因此在预接收地点修建暗挖横通道+暗挖扩大端的辅助结构,进行盾构解体接收成为主流方案,但暗挖扩大端的修建尺寸并无清晰参考。以北京地铁19号线为例,分析了暗挖扩大端宽度和高度的设计问题,并针对弃壳接收和部分弃壳两种方案,对暗挖扩大端的最小设计尺寸做了规定,即高度应包含开挖垫层、盾构直径和吊装空间三部分,其中吊装空间至少应为1.5~2m;当采用弃壳接收时,暗挖扩大端宽度与刀盘直径和刀盘分块暂存方式有关。提出了一种新的适用于暗挖扩大端内狭小场地的刀盘拆解方案,能够显著减小占地面积,同时设计了一种适用于洞内拆解主驱动的专用滑移辅助工装,提高了拆解过程的安全性。
When using the shield method to build subways in urban centers,it is often faced with such problems as insufficient ground space and engineering sites for conventional shield reception.Therefore,the auxiliary structure of the subsurface excavation cross channel and the subsurface excavation extended end is constructed at the pre-reception site,and the shield disintegration reception becomes the mainstream scheme,but the construction size of the subsurface excavation enlarged end has no clear reference.Taking the Beijing Metro Line 19 as an example,the design of the width and height of the enlarged end of the underground excavation is analyzed.For the two schemes of abandoned shell reception and partial abandoned shell,the minimum design size of the enlarged end of the underground excavation is stipulated.That is,the height should include three parts:excavation cushion,shield diameter and hoisting space,in which the hoisting space should be at least 1.5~2 m.When the abandoned shell reception is adopted,the width of the enlarged end of the subsurface excavation is related to the diameter of the cutterhead and the temporary storage mode of the cutterhead block.A new cutter head disassembly scheme suitable for the narrow site at the enlarged end of the underground excavation is proposed,which can significantly reduce the occupied area.Meanwhile,a special slip auxiliary tooling suitable for the main drive of the dismantling in the hole is designed,which improves the safety of the dismantling process.
作者
刘志坚
曹伍富
孙英韬
寇鼎涛
杨志勇
王炳禄
江玉生
LIU Zhijian;CAO Wufu;SUN Yingtao;KOU Dingtao;YANG Zhiyong;WANG Binglu;JIANG Yusheng(China Railway 14th Bureau Group Co.,Ltd.,Jinan,Shandong250101,China;Beijing MTR Construction Administration Corporation,Beijing100068,China;China University of Mining and Technology(Beijing),Beijing100083,China)
出处
《施工技术（中英文）》
CAS
2024年第7期104-109,共6页
Construction Technology
基金
北京市轨道交通建设管理有限公司双创基金资助(SCJJ2019005)。
关键词
地铁
盾构
暗挖扩大端
刀盘
拆解
subways
shields
enlarged end of under ground excavation
cutter head
dismantling
