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Tevor Butler

Trevor Butler

Trevor Butler leads a team of consultants at Frame Group Ltd that specialise in heritage asset management and recreation facility development throughout NZ.  This includes work on many iconic historic assets and development in high profile natural heritage sites.  He has a BE(Hons)Civil and an MBA and has been made a Fellow of Engineering New Zealand in recognition of his work in the application of appropriate engineering practice in sensitive outdoor environments.  Mr Butler has worked in the planning, design and management of restoration work on several heritage bridges in remote sites, including recent work on the Hapuawahenua railway viaduct near Ohakune, Bertrand Road suspension bridge near New Plymouth, as well as the Port Craig viaducts in Southland.  He has particular interest and experience in timber preservation and steel corrosion protection and has been successful in developing appropriate, cost effective methods for the restoration of heritage assets.

Paper: Port Craig Viaducts Conservation Plan

Abstract: The Port Craig viaducts in Southland, New Zealand are located over deep gullies on the bush tramway that operated from 1917 to 1930 as part of the Port Craig timber harvesting and milling operation. This was the first introduction of high production heavy hauler harvesting in New Zealand and forms a notable chapter in indigenous logging history. The largest of the four timber viaducts, the Percy Burn, is 125m long and 36m high and was built to carry an 80 tonne hauler and also the passage of loaded log trams. These viaducts are the four largest remaining timber bush tramway viaducts in New Zealand and they remain fairly intact. These viaducts are now important visitor attractions and heritage items, but time and the elements have contributed to their deterioration since the mill closure in 1930 to the point where, without remedial work and preservation, they will begin to collapse. The history and significance of the Port Craig sawmilling story is covered in a paper in these proceedings titled “Heritage Management at the Port Craig Sawmill Complex: Successes and Challenges” by Rachael E Egerton, Department of Conservation.

In 2007 The Port Craig Viaducts Charitable Trust commissioned a conservation plan for the purpose of documenting the history and significance of the viaducts as well as carrying out a detailed engineering assessment and developing a plan for their future restoration. This paper describes viaducts, as well as the methodology used to inspect and assess the viaducts and to develop the conservation plan and recommended restoration work. The conservation plan completed in August 2008 was prepared jointly by Chris Cochran, Conservation Architect; Michael Kelly, Heritage Consultant; Russell Murray, Conservation Architect and Trevor Butler, Consultant Engineer.

Sir Neil Cossons
Paul Davies
David Dolan
Wayne Johnson
Euan McQueen
Robert McWilliam
Duncan Waterson
David Beauchamp
Trevor Butler
Matthew Churchward
Andrew Cleland
Rachael Egerton
John Fitzmaurice
Don Fraser
John Gibson
Owen Graham
David Hamilton
Bill Harvey
Peter Holmes
Kevin Jones
Paul Mahoney
Tom Williamson
Peter Lowe
Peter Marquis-Kyle
Gavin McLean
Rob Merrifield
Owen Peake
Miles Pierce
John Porter
Nigel Ridgway
Tony Silke
Jim Staton
Richard Venus
Ian Walsh
Daniel Woo
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