PROJECT | TRENCHLESS
UNTANGLED AND OUT
With so many trenchless projects underway across North America, many challenges are faced – and overcome. T&TNA catches up with one such, but unusual, challenge in Toronto
After 15 months, the micro TBM (MTBM) that was tangled in tensioned steel tie-back wires, and so stuck on a section of Toronto’s Basement Flooding Protection Program, was finally retrieved. The MTBM had begun boring in March 2022 to install a 3ft-diameter (900mm) storm sewer. But a few months later, in June, became ensnared in the tie-backs that had been placed during prior construction works as part of brace shoring for two mid-rise developments in the area.
Above: An unexpected meeting below Toronto – MTBM stuck among surprise find of steel tie-backs IMAGES COURTESY OF CITY OF TORONTO 26 | Winter 2023
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