New expressway creates important links for Singapore
Singapore’s Kallang-Paya Lebar Expressway (KPE) involves
constructing 12km of six lane highway to connect the East Coast
Parkway with the north of the island at Tampines Expressway. The
US$675 million project by the Land Transport Authority of Singapore
includes approximately 8.5km of main cut-and-cover underground
tunnels, eight interchanges and six ventilation buildings.
Mott MacDonald’s appointment from design and build contractor
Samsung Engineering & Construction centres on designing a
US$205 million underground section for Singapore’s Land Transport
Authority. This section, known as Contract 423, is one of the most
challenging components on the whole expressway project.
Contract 423 is entirely underground and comprises a total
cut-and-cover tunnel length of 2.96km, two ventilation buildings,
five slip roads, two road bridges and an interchange. The tunnel,
which is nominally 36m wide, is located directly below a 27m wide
storm water canal for most of its length and the flow carrying
capacity of this has to be maintained at all times during the
construction of the tunnels. To add to the complication of the
design and construction, the route is adjacent to commercial and
residential buildings up to 25 storeys high. Some of these
buildings are located only 3m from the completed tunnel
Mott MacDonald has provided full detailed design services for the
2.9km section, following our initial work on the tender design. We
have also undertaken risk and environmental assessments. The
expressway is scheduled to be completed by 2005.
Designs will be finalised in 12 months and the expressway is
scheduled to be completed by 2005.
Construction of the cut-and-cover is progressing rapidly. Detailed
assessment of the impact of deep excavations on the adjacent high
rise densely populated residential blocks is ongoing. This is
proving to be most challenging as the ground conditions in the
locality are very unfavourable and there is lack of detailed
information on the foundations of the existing structures.