[3/25/2008 ]
TBM Anna has reached Malmö Central Station
The TBM Anna broke through the excavation wall at Malmö C on Tuesday afternoon. This means that she has reached her final destination on a 4.6 km long journey.
“The boring has been very successful, no major surprises or setbacks and we are on time” says Johan Brantmark, assistant project manager at subproject Tunnels.
Anna started to bore in Holma in the end of November 2006. She has taken almost 500 days to cover 4.6 kilometres. The machine has done several planned stops along the way – one three month maintenance stop in the rock cavity at Triangeln, two Christmas stops and several short maintenance stops.
The last leg, between Triangeln and Malmö C, was the most complicated distance to bore, with one sharp turn and with higher water content and more cracks in the limestone rock.
”It was definitely more water. It made the maintenance stops a little more complicated, but we have managed the distance without any greater difficulties” says Johan Brantmark.
The 1.9 kilometres between Triangeln and Malmö C took 130 days, which is an average speed of 15 metres per 24 hours.
”There are substantial differences from one day to another. Some days the machine has been standing still for maintenance and other days the progress has been very good. The record is 36 metres in 24 hours” says Johan Brantmark.
”Now that we can summarize the boring of the first machine, it has been very successful, no major surprises or setbacks. And above all, we are on time” says Johan Brantmark.
Anna’s sister machine, Katrin, is standing still for maintenance, about 500 metres from the excavation wall in Malmö C. Her breakthrough is estimated to take place in one month.
The Citytunnel project in Malmö consists of 17 km of railway connecting Malmö Central Station with the Öresund Bridge, as well as linking up the Scania railway network and increasing rail traffic capacity for the future. Six km passes underneath central Malmö, and the other 11 km is surface railway.
Malmö Central Station is being extended with an underground section. New stations are being built at Triangeln and Hyllie, south of Malmö.
The first spit was dug on 8 March 2005. The Citytunnel is planned to be complete in 2011. The budget for the project is SEK 9.45 billion at 2001 values.
Pictures on the breakthru will soon be available.