connecting two lines - the straits times · 2018. 7. 14. · trenchless underpass construction by...

Ion Orchard Orchard station Orchard Parksuites ORCHARD TURN ORCHARD BOULEVARD ORCHARD BOULEVARD PLATFORM LINK Source: LTA TEXT: ZHAKI ABDULLAH STRAITS TIMES GRAPHICS 30m 7.6m Connecting two lines Innovative engineering is being used to allow commuters to transfer between the existing North-South Line section of Orchard MRT station and the new Thomson-East Coast Line section, which opens in 2021, with only minor disturbance above ground. Constructing a 60m passage under busy Orchard Boulevard is achieved with an underground canopy of interlocking steel pipes, which prevents misalignment and breakage. These are inserted using a micro tunnel-boring machine, which is much smaller than the ones used for MRT tunnel boring. ORCHARD BOULEVARD 15m Mining and underpinning are currently being done for a 90m passage running under the North-South Line, with special machines that can drill in all directions within a conﬁned space. Real-time monitoring instruments ensure there is no disturbance to existing MRT operations. About 20 per cent of these works have been done since last September. PLATFORM LINK STRUCTURE Though the Bukit Timah granite formation in the area is suitable for tunnelling, cement-like material was added to the ground to stabilise it and prevent water from leaking. Trenchless underpass construction by pipe rooﬁng Towards Orchard station Thomson-East Coast line (Under construction)

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IonOrchard

WheelockPlace

Orchardstation

OrchardParksuites

PATE

RSON

ROA

D

ORCH

ARD T

URN

ORCHARD BOULEVARD

ORCHARD BOULEVARD

ORCHARD ROAD

PLATFORM LINK

Source: LTA TEXT: ZHAKI ABDULLAH STRAITS TIMES GRAPHICS

30m

7.6m

Connecting two lines Innovative engineering is being used to allow commuters to transfer between the existing North-South Line section of Orchard MRT station and the new Thomson-East Coast Line section, which opens in 2021, with only minor disturbance above ground.

Constructing a 60m passage under busy Orchard Boulevard is achieved with an underground canopy of interlocking steel pipes, which prevents misalignment and breakage. These are inserted using a micro tunnel-boring machine, which is much smaller than the ones used for MRT tunnel boring.

Connecting two lines

ORCHARD BO

ULEVARD

15m

Mining and underpinning are currently being done for a 90m passage running under the North-South Line, with special machines that can drill in all directions within a con�ned space. Real-time monitoring instruments ensure there is no disturbance to existing MRT operations. About 20 per cent of these works have been done since last September.

PLATFORM LINK STRUCTURE

Though the Bukit Timah granite formation in the area is suitable for tunnelling, cement-like material was added to the ground to stabilise it and prevent water from leaking.

Trenchless underpassconstruction by pipe roo�ng

Towards Orchard station Thomson-East Coast line (Under construction)