22 Jan '11, 7am

Why the Marina Coastal Expressway is now costing $4.3 billion

First, they tunnelled under a river to build the Kallang-Paya Lebar Expressway. Now, Singapore's road engineers are digging away at a more formidable challenge: Building a tunnel under the sea. The experience of building part of the KPE under the Geylang River has proved helpful to the work on the Marina Coastal Expressway, which in one section runs below the sea-bed parallel to Marina Barrage. "It's an extension of our existing technology ... (In terms of scope) when we crossed the Geylang River, it was 120m wide. Now, we are crossing a distance 420m wide," said MCE director Chuah Han Leong. Building out in the open sea, as opposed to the sheltered waters of a river, is naturally tougher. "Then we have to cater for the effects of the barrage," said Mr Chuah. The double-piled temporary walls have to be impermeable and strong enough to withstand the barrage's maximum discha...

Full article: http://www.todayonline.com/Hotnews/EDC110122-0000128/A-ro...

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