DATA & DIGITAL | TECHNICAL
Skt. Jørgens sø Kødbyen
Det Ny Teter Vesterbrogade
Gasværksvej Halmtorvet
Cabinn City Hotel
Kalvebod Brygge Pumpestation
20m deep Skybrudstunnel
1250m long Above, figure 2: The tunnel in section
This innovative approach results in an increased
output quality and consistency as well as time and cost savings. The tool has been applied on more than 10 projects, including a project in Canada as described by Boye et al (2021). Similar tools have also been developed for other aspects of tunnel design including automatic drawing production.
PROJECT OVERVIEW Jacobs is part of the group of consultants on this project with NIRAS being the lead consultant. The client is HOFOR (Greater Copenhagen Utility) and Fredriskberg Forsyning. The need for this flood alleviation project was brought
about by flooding events in the Danish capital. Over several years, HOFOR will be constructing a number of cloudburst storage and flow diversion tunnels to help protect the city against flooding. One of the tunnel projects is the Kalvebod Brygge Skybrudstunnel. It will convey runoff collected from existing nearby sewers to a large pumping station for discharge into Copenhagen harbour. The Kalvebod Brygge Skybrudstunnel is composed of
two sections (see Figures 1 & 2): ● The section between Skt Jørgens Lake (JØR shaft) and Søner Blvd (SB) shaft, is 2m i.d. and 725m long. The depth of tunnel below ground along this section is approximately 12m to 17m (depth to crown).
● The section between SB shaft and Kalv pumping station, near Copenhagen harbour, is 3m i.d. and 540m long. Depth of tunnel in this section is approximately 11m to 12m (depth to crown).
The Kalv pumping station was designed by Jacobs. SB and JØR shafts were designed in parallel by NIRAS.
Based on information from ground investigations,
the tunnel face is mostly located in glacially disturbed Upper Copenhagen Limestone (UCL). In the area of the proposed tunnel and shafts, UCL is typically overlain by Greensand (sand and limestone); Lower/middle meltwater (sand); Lower clay; Upper clay; and, fill/post glacial deposits. This project is highly complex due to its ambitious
size and planned pumping capacities. But the Kalvebod Tunnel project also traverses a
highly urbanised area with many buildings of historic and cultural significance as well as important existing infrastructure, such as a busy railway line and a metro line. Due to the location of the tunnel and the existing
buildings and infrastructure above, the project required establishing a building damage assessment procedure. This work included pre-assessment of 40No. buildings above the tunnel centreline, most of which have been classed as heritage buildings for conservation.
TYPICAL METHODS OF SETTLEMENT AND IMPACT ANALYSIS Typical methods to determine magnitudes of tunnel settlement and building impact analysis involve data management using Excel spreadsheets and other commercially available software tools. These methods often have only limited integration with CAD software and also are limited in their data handling capacity in dealing with large terrains with thousands of buildings. Often numerous spreadsheets are required and
manually plotting the settlement contour lines in a CAD package. Furthermore, there is often a need to combine settlements from multiple underground structures
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