北京铁路地下直径线盾构选型

Choosing shield machine in the Beijing subway construction

1 工程概况 北京铁路枢纽北京站至北京西站地下直径线工程，白北京站起．沿崇文门西大街、宣武门大街，莲花池东路至北京西站，线路全长9．156km，其中地下隧道长7．23km．地下隧道中盾构施工长度为5．7km。北京铁路地下直径线工程是国内第一条采用盾构法施工的铁路地下隧道，也是目前城市最大直径的双线铁路隧道工程。

It is an important construction in Beijing subway net, which will connect two railway station of Beijing, from Beijing station to Beijing western station. The whole length is about 9km, and the proportion of underground tunnel will reach 7.23km. The length of subway which needed to construct by the shield-drive tunneling is about 5.7km, which characteristically with a straight diameter line. As we known, it is essential for contractor to choose shield machine correctly according to the geology of local region. CHE N Kui reported about this construction, who has lots of practice in the tunnel construction.