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2002 (c) Peninsula Community Access Newspaper Inc

 

Tender let for rail drain

 

Gosford Council has accepted a tender from Delcare Constructions Pty Ltd for drainage works and pipe jacking under the rail line at Woy Woy near the drainage outlet at Brief St.

The construction period is eight weeks and the work is scheduled to commence this month.

The work involves "pipe jacking" two 1.65m concrete pipes 25m under the rail line and installing another 15m of pipes using open cut construction either side of the railway line.

The work is entirely within the State Rail Authority (SRA) railway land.

Concrete pits will be constructed at both ends of the work.

The pipes will provide an outfall for the Brief St stormwater catchment.

Design plans have been prepared for this catchment to cater for a standard 1 in 100 year flood with an estimated construction cost of $7 million.

The catchment is bounded by Ocean Beach Rd to the east, Dunban Rd to the south, Melba Rd to the north and at its outlet at Woy Woy Inlet at Brief St.

Council's Flooding and Drainage section told the council that the most economical pipe configuration under the railway line was four 1.65m diameter reinforced concrete pipes.

However, the SRA would only allow two of these pipes to be laid at a time due to bank stability and potential settlement problems.

The SRA had laid "baulks" under the rail lines, when the lines were recently closed, ready for council to lay the first two pipes.

The other two pipes could not be laid before the next line closure, due in 12 months' time.

Council was told the successful tendering company had satisfactorily completed various projects in the past including major culvert construction for the Riviera Catchment Drainage at Terrigal and had recently completed the construction of stormwater drainage for Koolang Rd and Milpera Rd, Green Point.

The sub-contractor nominated to carry out the pipe jacking under the rail line was Tunnel Boring Projects Pty Ltd.

The council was told this contractor had extensive experience in pipe-jacking large diameter pipes over greater distances than required for this project and through similar ground conditions.

Council agenda, EP.056 October 1