The Kallang Paya Lebar (KPE) expressway is "One of the toughest projects in the world" according to the Land Transport Authority (LTA) review board of five international experts including Dr. Victor Milligan from Canada and Professor Robert Mair from Cambridge. (The Straits Times Monday 23 August 2004)
Yongnam is the specialist sub-contractor for the KPE strutting works for three contracts namely C-421, 423 & 424 KPE totaling 7 km of the total 9 km underground stretch. In C-421 KPE, East Coast Expressway to National Stadium, we are installing sheet piles, strutting works and cofferdams across the Geylang River . Silt laden river bed, marine clay, 25m depth excavation and 80m wide triple struts have been undertaken.
C-423 KPE, from PIE expressway to Eunos Link, snakes under the Kallang River Canal and between housing estates. The 35m wide expressway is being fitted in between a 50m wide corridor. The Kallang River Canal has to be diverted, initially north bound and then on top of the completed section of the KPE tunnel south bound. The flow of the canal has to be maintained at all times during the whole period of construction.
C-424 KPE, Eunos Link along Airport Road to Tampines Road, runs along the Paya Lebar Airport Road and construction equipment like cranes with tall boom lengths have to be closely monitored and equipped with special checked flags as signal to aircraft in the area.
The above three KPE projects have a combined total of about 150,000 tons of sheet piles and struts including walers to install where about 60% has been completed (May 2005).