New Lynn Rail Trench - Tension Piling  Client: Ontrack Location: Auckland Engineer: Beca Main Contractor: Fletcher Construction Engineering Value: $4m Started:  Completed:  May 2009

This piling subcontract is part of the overall New Lynn Rail Trench currently under way.

Scope of Works:

Bored Piles

• Construction of 246 x 750 dia bored cast in-situ piles (piles are used for tension and compression)
• Depths of piles range from 25m - 50m, with the majority being constructed under Bentonite support fluid.

H-Piles

• Drive 168 x 310UC 109kg/m H-Piles.
• Piles will act as end bearing support for a capping beam, on which passenger trains will travel.
• Lengths range from 18m - 40m with a maximum UDR of 2540kN at bridge locations.

Logistics

• Full co-ordination with ONTRACK safe working procedures.
• Strict lifting restrictions in place (no lifting >6m before 09:00 or after 15:00)
• Working with Rail Track protectors
• Rail corridor approximately 1km x 10/14m.
• Working in close proximity to the general public.
• Various footpaths through working site to/from platform and street access.
• Strict environmental controls (all excavation areas to have bunds in place)
• 24/7 Day and Night shifts with noise control

Brian Perry Civil were performing this work in a live rail corridor, with trains passing every 15 -20 minutes. 

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