Key Project Details
Project Value$2.0 million
Design work commenced in 2011 and construction was completed mid 2012.
Undercutting soft material beneath the existing bridge and maintaining rail operations. Designing the replacement culvert structure to be constructed beneath the bridge as well as allowing for propping and temporary retaining installation.
|A large culvert structure was selected as the most cost effective replacement of the aging timber piers and steel span bridge known as Bridge 50 ECMT.
On the edge of the coastal marine Tauranga Harbour area, the East Coast Main Trunk Line (ECMT) carries a significant volume of rail freight traffic and construction activities were required to be designed for minimal disruption and in consideration of managing potential adverse environmental effects. Construction utilised off site precasting and post tensioning of culvert sections together beneath the existing bridge.
As part of the approach works to the culvert, KiwiRail required the existing formation to be widened for curve easing to improve train speed through this section of the line and the extension of a rail passing loop. Soft material was removed and the new rail formation constructed with geogrid strengthening for support.
The culvert was designed to support future double tracking of the ECMT by having sufficient length to support two tracks should KiwiRail decide to extend the current passing loop in the future.