Underground Construction - August 2021 - 16
Taming a Mammoth
With the shallow depth of the existing stub-out requiring
the proposed 84-inch gate valve to be mounted horizontally,
LAN designed a vault and foundation to provide support
and evenly distribute the weight of the valve as it operated
from open to close. The shallow depth also meant that the
air release valve would extend above grade. The project team
adapted by designing a steel cabinet enclosure around the
air release valve with doors on both sides for access.
Complex challenges
Access panels are placed over vault. (Photo Credit: LAN)
Construction for the interconnect commenced in April
2020. The general contractor, Main Lane Industries, began
excavation for the proposed foundation and vault.
" One of the biggest challenges was the limited workspace.
We had to come up with a plan to make the best use of
space that we had, " said Jeff Heflin, project manager at
Main Lane Industries. " We went with a 200-ton Hitachi
crane. Once we had a plan for the crane in position,
everything else fell into place. Planning was key. "
Soil conditions varied from lean clay soil with gravel to
very stiff lean clay or fat clay with sand. Groundwater was
found initially at 15 feet below grade, but this level fluctuated.
A well-point dewatering system was used for excavation to
install the structural slab that was placed approximately 30
feet below grade. The slab was placed first, then the walls.
" It got tricky because the back side of the vault was also
the edge of the adjacent Wilson tunnel shoring, which was a
circular shaft next to the rectangular vault excavation, " said
Heflin. " We planned the rectangular shoring dimensions to
avoid conflict with the adjacent tunnel shaft shoring. "
To add another layer of complexity, the existing 84inch
main waterline extending parallel within a few
84-inch diameter double disc gate valve is lowered into position and bolted fasteners are used to attach the flanged connection. (Photo Credit: LAN)
16 AUGUST 2021 | UCONonline.com
http://www.UCONonline.com
Underground Construction - August 2021
Table of Contents for the Digital Edition of Underground Construction - August 2021
Contents
Underground Construction - August 2021 - Cover1
Underground Construction - August 2021 - Cover2
Underground Construction - August 2021 - Contents
Underground Construction - August 2021 - 4
Underground Construction - August 2021 - 5
Underground Construction - August 2021 - 6
Underground Construction - August 2021 - 7
Underground Construction - August 2021 - 8
Underground Construction - August 2021 - 9
Underground Construction - August 2021 - 10
Underground Construction - August 2021 - 11
Underground Construction - August 2021 - 12
Underground Construction - August 2021 - 13
Underground Construction - August 2021 - 14
Underground Construction - August 2021 - 15
Underground Construction - August 2021 - 16
Underground Construction - August 2021 - 17
Underground Construction - August 2021 - 18
Underground Construction - August 2021 - 19
Underground Construction - August 2021 - 20
Underground Construction - August 2021 - 21
Underground Construction - August 2021 - 22
Underground Construction - August 2021 - 23
Underground Construction - August 2021 - 24
Underground Construction - August 2021 - 25
Underground Construction - August 2021 - 26
Underground Construction - August 2021 - 27
Underground Construction - August 2021 - 28
Underground Construction - August 2021 - 29
Underground Construction - August 2021 - 30
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Underground Construction - August 2021 - 41
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Underground Construction - August 2021 - 46
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Underground Construction - August 2021 - Cover3
Underground Construction - August 2021 - Cover4
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