Cofferdams/Subaqueous Pipeline: Merrimack River Water Intake Structure

Owner: Pennichuck Water Service Corporation Partner: Kingsbury Companies Type: Infrastructure Support Location: Merrimack, New Hampshire Project Description: For this project, H.B. Fleming installed three cofferdams on land for junction structure, as well as interconnected piping and a wet well. In the water we installed a trestle for crane access to the river and a 200-foot-long…

Cofferdams/Excavation Support: Dartmouth College

Owner: Dartmouth College Partner: Turner Construction Type: Institutional Construction Location: Hanover, New Hampshire Project Description: H.B. Fleming installed 1,000 feet of shoring to support construction of a parking garage three stories below grade, with an engineering and science hall to be built on top. The project entailed driving 70-foot-long sections of sheet pile around the…

Portsmouth Wastewater Treatment Plant

Owner: City of Portsmouth Partner: Methuen Construction Location: Portsmouth, New Hampshire Project Description: Designed and installed a cofferdam to support an excavation depth of 26’ feet, which included a 12’ cut in bedrock. The cofferdam was supported with soil anchors, tie-rods/deadman, and drilled pin pile to support the sheet pile tips.