Richmond-San Rafael Bridge Retrofit Project
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Customer:CALTRANS
- Responsibilities:
- Setting 200-Ton Pile Caps
- Underwater Surveys
- Tremie Pours
- Core Drilling
- Welding
- Setting Steel Casings
Nature of the Effort
Provide Commercial Dive Labor, Equipment,and Materials in support of underwater seismic-retrofit operations on bridge piers.
Tasks Performed
HOI was teamed to support topside and underwater operations related to this Project. The Richmond-San Rafael Bridge is the largest earthquake retrofit project that has been conducted to date in the State of California. This has entailed comprehensive underwater inspections of the existing substructure. The inspections encompass as-building to confirm that the designed components will fit, structural analysis,identification and removal of anomalies such as formwork. HOI provided in excess of 50 specialists for above and underwater construction inclusive of marine-underwater superintendent and foremen. Work was conducted from two of the HOI DSV‘s and joint venture barges. HOI conducts diving activities utilizing both air and nitrox to depths 70fsw for underwater drilling, cleaning, pile driving, concrete tremie pours, installation of steel casings and concrete jackets. HOI has developed and built specialized equipment for cleaning of the substructure and diverless-diver assisted core drilling.