Manholes and Microtunneling

by Evarett Cruz, Jr., (M.ASCE), Vice Pres.; Cruz Construction, Holmdel, NJ,

Serial Information: Civil Engineering—ASCE, 1992, Vol. 62, Issue 12, Pg. 52-55

Document Type: Feature article

Abstract: Contractors are for the Oakwood Beach Interceptor Sewer Project, on Staten Island, N.Y., were having difficulty. Glacial tills and a high water table made working 90 ft below the ground difficult and change orders common. But a combination of microtunneling and wet caisson shaft sinking, executed by Cruz Construction Corp., Holmdel, N.J., had them come in ahead of schedule and on-budget. Their $29 million dollar project used the largest mole ever manufactured for use in the U.S. and concrete pipes able to withstand a 5 million lb jacking load. Like the microtunneling work, the wet caisson shaft sinking method made use of the groundwater instead of trying to fight it. The project, which required nine shafts and 5000 ft of pipe, was only minimally disruptive to the streets and neighborhoods of the island and demonstrated that large scale microtunneling is cost-effective and workable for deeply placed urban pipeline projects.

Subject Headings: Caissons | Construction management | Contract management | Microtunneling | Sewers | Shafts | Water table |

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