ABSTRACT
This paper describes the construction of the northern end of the Outram Park Station of the North-East Line where there are three major local constraints as well as the typical construction constraints common to the rest of the station. The following major constraints were experienced:-
Limiting the movement of the nearby existing operating MRT subway tunnels to a minimum such that safe operation could be maintained at all times.
Conduction of a five level basement at this North end of station within the stipulated program.
Using northern end of the station box for launching of the Tunnel Boring Machine (TBMs) for the drives toward Chinatown Station (CNT) and as mucking ’shaft* for removal uf earth from the bored tunnelling excavation.
An overview of the temporary works system selected to overcome these constraints and to balance the ground loads are provided.
A comprehensive geotechnical instrumentation scheme was implemented for monitoring the behaviour of the temporary works system, the adjacent structures, adjoining ground and the existing tunnels. The paper concludes by evaluating these instrumentation results.
