大断面下穿铁路地道桥顶拉法施工技术

以孝义市北景观大道大断面下穿铁路地道桥顶拉法施工为例,详细介绍施工方案比选、顶拉法施工工艺和顶力力学状态,确定了分节长度选择原则及其参数,并开展了工程的现场施工实践。结果表明:顶拉法施工中具有施工场地小等优点,成功克服了场地受限条件下长距离、大断面地道桥施工难题。

Construction Technique of a Large Section Underpass underneath a Railway

This paper presents a case history of the construction procedures of a large cross section underpass underneath a railway at Jingguan Boulevard North in Xiaoyi City. The selection of construction procedures in the large cross section underpass, launching and receiving of horizontal tunneling techniques as well as the mechanics of horizontal tunneling are introduced in the paper. The selection of tunneling segment length and other parameters are also presented. The construction results indicate that the launching and receiving method has the advantage of working a limited space. This method provides a solution to the construction of underpass with horizontal tunneling in long distance under limited space.