Sandy digs into work

Avon Valley Gazette - - NEWS -

READ IT ON­LINE FIRST A SEC­OND tun­nel- bor­ing ma­chine has be­gun tun­nelling at High Wy­combe as part of the $ 1.86 bil­lion Forrestfield- Air­port Link project.

Sandy – named af­ter the WA sand­groper by lo­cal stu­dent Sarah Spratt – was launched to­day from the 12m- deep dive struc­ture at the site of the fu­ture Forrestfield train sta­tion.

Sandy’s ‘ sis­ter’ ma­chine Grace – named af­ter schoolgirl Grace McPhee – was launched in July, start­ing a two- year jour­ney to Bayswa­ter, where the 8.5km Forrestfield- Air­port Link will spur off the Mid­land rail line.

Grace be­gan tun­nelling in Au­gust, and has now trav­elled more than 600m into the earth at 20m per day.

The two ma­chines will each tun­nel 8km un­der Perth Air­port and the Swan River, link­ing new sta­tions at Forrestfield, Air­port Cen­tral and Bel­mont.

Con­struc­tion of di­aphragm walls ( which will house the sta­tion box struc­ture) is now com­plete at Air­port Cen­tral, and ex­ca­va­tion of the soil inside the walls High Wy­combe PS Year 4 stu­dent Sarah Spratt with tun­nel­bor­ing ma­chine Sandy. has be­gun. Di­aphragm walls are also un­der con­struc­tion at Bel­mont, and are about 70 per cent com­plete.

As the ma­chines’ cut­ter heads bore through the earth, the ma­chines will also in­stall about 54,000 re­in­forced con­crete tun­nel seg- ments.

About 5750 seg­ments of the 54,000 needed to com­plete the tun­nel struc­ture have al­ready been fab­ri­cated at a Forrestfield fa­cil­ity.

“From now on, as the con­struc­tion of the three train sta­tions on the Forrestfield- Air­port Link ticks on above ground, un­der­neath the sur­face Grace and Sandy will be bor­ing and re­in­forc­ing the foun­da­tion of the tun­nels which trains will run through in only three years time,” Trans­port Min­is­ter Rita Saf­fi­oti said.

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