Shoring consisted of a driven sheet pile
system braced with a combination of
internal bracing, tie-rods and tie-backs to a
maximum excavation depth of 11 metres.
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This system reduced the ingress of groundwater into
the future facility, resulting in less costly water management
for the owner and enabling more sustainable use of
Alves says that the project, while smooth in delivery,
did come with challenges.
“The project was very close and in proximity to Golden
Ears Way, a busy road connecting Maple Ridge and Pitt
Meadows to Langley and Surrey. It was also very close to
the existing Katzie Pump Station,” he said.
In addition to proximity issues, there were several
changes to the design required by the client during
construction. “These changes required agility and a
lot of technical expertise from our design-build team,”
The Golden Ears Pump Station project engineers
turned to shoring methods to complete the job. Shoring
is commonly seen in port and harbour construction and
is best used when crews need to isolate their excavation
from bodies of water such as a creek, pond or ocean shore.
Similar to a soldier pile retaining wall, shoring can be
constructed by driving steel sheet piles into the ground
using a vibro hammer. The wall is formed by connecting
the Z or U connectors of the sheet piles.
To get the job done, HFDI designed a robust engineered
frame system to hold the sheets in place during staggered
driving. This technique ensured the sheets were installed
within construction tolerances and maintained proper
interlock during driving. The frame was supported by
temporary pipes. Alves says the embedment depth was
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