Preparing for Repair (Available only in Geoenvironmental Special Issue)

by Glenn Evans, Owner; Alternative Structural Technologies, Shingle Springs, CA,
David A. Crane, Struct. Engr.; JDC Associates, Carmichael, CA,
Tom Helldorfer, Principal; Coloma Engineering, Shingle Springs, CA,

Serial Information: Civil Engineering—ASCE, 1997, Vol. 67, Issue 8, Pg. 12A-16A

Document Type: Feature article

Abstract: The Sacramento River Water Treatment Plant, Sacramento, Calif., was built in 1924 and hadn't been upgraded since 1958. In 1996, the city of Sacramento, the owner of the plant, decided to renovate the facility and to rehabilitate any visible areas of damage. Before the construction began, the city hired a five-firm investigative team to evaluate the extent of the damage to the facility, especially to the Head House, its on-site control building. The team's findings indicated that the Head House had become seriously damaged owing to severe settlement, liquefaction and chlorine degradation. Combing those problems with the fact that the treatment plant sat within 80 mi of both the San Andreas and Vacaville faults prompted the investigators to make the most pressing repairs themselves. Their repairs included the removal of spalled and damaged concrete, the reinforcement and repair of the water pipes leading into the Head House, and the remediation of the settlement of the structure. To complete the work, the team employed a variety of novel techniques. For the concrete-removal phase, workers used selective demolition to carefully remove only the damage sections of concrete. To repair the water pipes, the team chose to use a special fiber and epoxy wrap. Finally, to fix the problem of settlement and to support a 275,000 gal. steel tank on the second story of the Head House, workers used soil grouting. The investigators' work also allowed the timetable of the permanent rehabilitation of the treatment plant to be accelerated.

Subject Headings: Assessment | Damage | Rehabilitation | Renovation | Settlement | Soil liquefaction | Water treatment plants |

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