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Speen Street Culvert Emergency Repair
Natick, MA
This contract consisted of the removal and replacement of a 100 year old double barrel stone arch culvert that was partially collapsed. The culvert ran under Speen Street in Natick, MA. The new culvert was designed for a 100 year service life.
J.F. White excavated out a cofferdam to construct a tremie seal for the placement in “the dry” of a double barrel precast culvert. Excavating the cofferdam was approached with two different methods. A conventional excavator rough cut the bulk of the material within the cofferdam and a 2cy clam shell bucket attached to the Manitowoc 12000 crawler crane provided final cut within the cofferdam. The excavator rough cut the tight wingwall areas and the final cut was performed by the clam shell. The material removed from the cofferdam was stockpiled and drained prior to trucking it offsite.
The precast culvert was originally designed as two separate barrels laid on a crushed stone base. J.F. White produced a double barrel precast culvert section to reduce the number pieces placed into the cofferdam. This approach reduced trucking to a congested site, reduced schedule time for placement and eliminated the need to place closure concrete between the two separate structures. The pick weight of the typical precast piece was 34 tons.
FACTS OF THE PROJECT | |
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Steel sheeted cofferdam constructed. | |
Settlement pond diverted through 336” diameter pipes. | |
Cofferdam was a complex shape with twelve corners and one angle point. | |
Dewatered the cofferdam in a two phase approach. |