Warsaw Metro Line 2 Construction
The Warsaw Metro (Polish: Metro Warszawskie) is a rapid transit system serving the city of Warsaw, the capital of Poland. It currently consists of two lines, the north–south Line 1 that links central Warsaw with its densely populated northern and southern suburbs, and the initial segment of the east-west Line 2 that opened on March 8, 2015.
Warsaw Metro Line 2 will be a 19km-long route with 19 stations running in the east-west direction. On April 30, construction on Szwedzka station started, and on May 2, the other two stations started construction. Construction of this phase will take 3 years and will open mid-2019. Initially this extension was to be built at the same time as the west extension but due to delays it was decided that each extension will be built at its own pace.
SDA bolt is often used in the pre-support of tunnel in metros to replace the conventional anchoring method. In tunnel construction, the main function of SDA bolt is to reinforce rock mass, improve the stability of surrounding rock, give full play to rock self-supporting ability and control the deformation and rock collapse of surrounding rock. Compared to the traditional support, SDA bolt has been widely applied in the world tunnel construction for its notable features as well as the technical and economical benefit.