Selkirk
Restoration of the Selkirk Bricks kiln chimney was one of the larger heritage projects that Spire has taken on. Proudly, every element of the project was handled by our three-man team, with rope access and elevating work platforms eliminating the need for costly scaffold.
Background
Selkirk Brick started operations in 1883 and moved to its current Howitt St Ballarat site in 1900. The new site allowed for the construction of continuous Hoffman-style kilns with striking octagonal chimneys. After 60 years of service the Hoffman-style kilns were made redundant by the construction of tunnel kilns in 1962. One of original 35m chimneys survived the transition and, with its signage, has become a local landmark. Over the years, the original crown had been removed and, despite the quality of its construction, time and elements had taken a toll on the structure.
Challenge
A photogrammetric survey and engineering report had established the chimney remained structurally sound and perfectly vertical, but with gravitational hazards posed by concerning areas of loose and displaced masonry and significant deterioration of mortar joints. Spire was contracted to undertake rectification works including a full repointing of all mortar joints, crack repair, reinstatement of loose brickwork and replacement of the landmark signage.
Process
Through limited use of 45m EWPs, Spire was able to undertake initial stabilisation and crack stitching reinforcement of the upper portion of the chimney. Rope access lines were then rigged via a Spire-fabricated steel frame through the furnace door and over the chimney coping, thus avoiding tensile loads on the masonry. A natural hydraulic lime mortar was formulated for compatibility with the porous original bricks. Stainless steel helical bar was grouted into bed joints to repair cracks. Signage was then measured, marked and removed, including the destructive mild steel fixings. Old mortar was then raked out and painstakingly repointed using rope access. In places where brickwork was displaced, bricks were numbered and removed before being re-laid with fresh mortar. New signage was installed to complete the project.
