Category: Civil Construction

Wallace Building Contractors have a long history of civil projects completed throughout the Wellington Region over the last 30 years. Wallace is proud of completing many difficult and unique civil projects and has worked on major flood protection to waterways throughout Wellington, multiple headwalls and inlet structures in areas with limited access and major sewer and stormwater works.

2015 – Wallace Building Contractors was proud to be involved in the construction of the Australian War Memorial at the National war memorial park. It commemorates the long and close relationship between the people of Australia and New Zealand, and in particular, our shared Anzac experience of war. It comprises 15 columns, each 6m tall and arranged in an open array on a surface of red sandstone and dark grey basalt.

All of Wallaces hard work is buried under the red and grey sandstone paving however over 300m3 of concrete was installed including a 500mm thick raft slab under the stone columns with a fibremesh wearing slab surrounding it. 7 Tree pits were formed for the Eucalyptus trees and a series of 80 different height plinths were formed to support the varying size sandstone blocks and stairs.

Our work drove the tight programme and was completed 2 weeks ahead of schedule giving the Australian servicemen and government dignitary’s plenty of time to visit the memorial before the opening of the remainder of the park on Anzac Day 2015.

2015 – Wallace Building Contractors was asked by Naylor Love to complete the concrete works for the Lower Hutt Anzac memorial upgrade. As was the case with most memorial upgrades before the 100^th anniversary of Gallipoli the timeframe to complete these works was very tight. New wearing slabs, steps and retaining walls were constructed and one of the region’s largest cranes was brought in to shift the 15T cenotaph to the north, and re-orient it to face east into a wider expanse of lawn. Wallace then mass-filled concrete under the new location of the cenotaph and formed steps around it to make it look like it had always been there.

2012 – Wallace have again been involved in another section of the Hutt River Flood Protection. This time in the Boulcout Flood protection upgrade project working for Goodmans Contractors. Work involved constructing 400m of new Insitu Concrete retaining walls around Connolly St where the river road was diverted over the new stopbank. The retaining walls up to 2m high provide flood protection to the surrounding roads and houses. Wallace was also involved in miscellaneous concrete works and structuressuch as Stormwater penstocks, cable protection slabs, access stairs, kerbing, channels and paving.

2011 – Formwork and placing of Concrete to the new subway under the double lane railway lines in Paraparaumu. Included new Ramps and stairs, insitu walls and soffits. Work was completed while commuters used the railway station and towards the end of a busy project involving the double tracking of the Waikanae to Wellington railway lines.

2010 – Foundations, Retaining walls and office slabs for the new Asphalt plant at Horokiwi Quarry. Included the construction of a concrete plantroom and ablutions block. Setting up cast In bolts for the new machinery to be installed onto, New Transformer room and tank stands

2008 – Wallace was involved in the Stage 2 landfill development at the Silverstream Landfill providing a new 9 million M3 60m deep landfill pit. We worked on stabilisation of the landfill face with a 9m high concrete wall filter using 550m3 of No-Fines Concrete underneath an HDPE Liner with a face area of 2600m2. The contract Included design and manufacture of 2 steel formwork systems to allow further stabilisation to continue as needed.

2008 – Wallace worked on another stage of Hutt River Flood protection from Ava to Ewen Bridge including underpinning work on the Ava Rail Bridge concrete supports involving temporary realignment of the river with reinforcement into the existing bridge piles and encasement with concrete with no delays to the rail service. Other work included new concrete Floodwalls and outlets, concrete stairs and sloping aprons, 2km of paving and retaining work

2007 – This Contract involved the forming of 1.5km of decorative concrete road islands along the length of Aotea and Jervious Quay. Work was completed under the Higgins Contractors Traffic Management plan from 9:00 – 3:30. The work involved exposed aggregate surrounding newly planted Pohutukawas with cast in wind delfecting screens and cast in up lighting.

2005 – Wallace Building Contractors was involved with Higgins Contractors in the road widening upgrade of SH1 in Paremata with the construction of a 700m long decorative concrete retaining wall at Goat Point from Paremata to Plimmerton. The Work was undertaken in an area between SH1 and the railway main trunk line. Due to the tight confines of the working area available we produced a rolling and lifting formwork system to pour the wall.

The formwork involved a specifically made steel mould to produce a pattern along the wall at a constant RL as wall height increased and decreased. It was lifted into place by winches on a specially built mobile Gantry, which was clad for all weather protection and safety from trains. This methodology was employed as the wall was in some places just 1.5m from the train tracks. The Gantry moved along a track bolted to the concrete footing and was poured in two 5m sections every 2 days.

During the excavation and construction of the wall foundations work was completed within 100mm of the North Island main fibre optic cable. Enhancement work was completed along the length of the wall including a galvanised steel pedestrian barrier,lampposts footings and cast in sockets for steel lampposts.

2006 – This Contract was for the removal and construction of the Black Creek Bridge in Wainuiomata as part of the Stream widening contract awarded to Dixon & Dunlop. Wallace removed the old footbridge and constructed new bridge abutments on 30m piles then craned in the new Precast Bridge and completed with handrails, paving and landscaping.

Wallace Building Contractors involvement in the Porriua stream flood protection was as the main contractor to the Wellington Regional Council. The work undertaken involved the realignment of the stream and concrete floodwalls through the City Center.

The realignment included building up new stop banks with conditioned fill and placement of Rip Rap Rock to both sides of the wetlands at the mouth of the stream. The concrete floodwalls were constructed to protect the neighboring commercial buildings and had a decorative finish to both sides. The contract also included a large area of landscaping which involved the building of timber walkways over the wetland area and the complete planting of the 2.5-kilometer length of the stream flood protection works.

This contract, completed in 1994 was the biggest workload that Wallace Building Contractors had taken on at the time. The contract was completed on time and within the Council budget. During construction we encountered a 5-year flood and all our temporary works held well. We had temporary walls and bunds along with flow over weirs crossing the stream. This was a major construction project within the Porriua City centre.