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Contractors World International Vol 7 No 5

29

When completed, the fully assembled tunnel boring

machine will be 22 ft (6.96 m) in diameter and weigh

461 ton in total. The new subway tunnel will be almost

2,000 ft (600 m) in length, connecting two areas of the

city currently separated by water.

Robert Young, director of operations at Hydra-Slide,

was onsite to provide training for Yu Sin personnel on

the set-up and operation of the HT300 skidding system

and witness the first slide of

the bor i ng mach i ne

components.

He explained that despite

the complexities involved with

transporting the skidding

equipment by Air to Singapore,

no complications arose from

utilizing the equipment

underground.

Young said:

“This is actually the perfect application for the

HT system due to its modular design, light weight

and ease of assembly. No extra ground testing

was necessary as the bottom of the launch shaft

was poured concrete that was capable of

supporting the weight of the HT300 and loads.

This was the first time our equipment was used

to move a TBM [tunnel boring machine] and we

see future potential in this area, especially after

the success of this project.”

In addition to the standard HT300 skid system, Hydra-

Slide’s scope of supply included provision of specially

designed skid shoe extensions, which allowed the boring

machine’s base full contact support with the skid

system.

Jefferson Yee, general manager at Yu Sin, said the

front body assembly consisted of six pieces weighing

241 tons in total, which were lowered into the launch

shaft and assembled on the HT300 skid system. It com-

prised the front body bottom (34 tons), bearing (98

tons), front body top (32 tons), cutter head (64 ton),

working deck and man lock, which together added an-

other 13 tons of weight.

Yee explained that after the front body was slid into

place, the middle body was lowered in one 128-ton

piece, followed by the 64 ton rear body and, finally, the

two-part screw conveyor that weighed 28 tons. At the

end of each slide, the sub-assemblies were pulled onto

the launch cradle using hydraulic jacks and connected

together.

He concluded:

“The project was a huge success. I would like to

thank the Hydra-Slide team for helping us

achieve our goals for the installation of the

TBM.”

The project is scheduled for completion in 2018.

Hydra-Slide

The cutter head being lowered onto the assembly

cradle.

A piece of the tunnel

boring machine is lowered

by a Terex AC700 crane.