摘要
Abstract
This paper analyzes the problems which exist in construction of the intersection point between inclined shaft and main tunnel at present. Afterwards, taking the Xitieche No. 2 Tunnel of Central and Southern Shanxi Railway as an example, this paper introduces the design schemes and their construction key points, including the transition section by using the bell mouth at the intersection point between inclined shaft and main tunnel, the portal frame at the intersection point, and the portal-type small tunnel heading at the intersection point. Also, this paper describes the matters needing attention in construction. The paper thinks that, by using the bell mouth at the intersection point between inclined shaft and main tunnel, the construction efficiency can be improved remarkably, and the potential safety hazards during the overlapping operations can be reduced. At the same time, by using the features of the cross sections, the longitudinal thrust force can be counteracted effectively, which is acted on the inclined shaft by the primary support of main tunnel at the intersection point.关键词
长大隧道/斜井转正洞/喇叭口/门式钢架/门式小导洞/交叉段加强/施工要点Key words
long tunnel/ intersection point between inclined shaft and main tunnel/ bell mouth/ portal frame/ portal-type small tunnel heading/ reinforcement at intersection point/ key points of construction分类
交通工程
