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Golden Gate Bridge Foundations to be Inspected

Wednesday, January 30, 2019

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The foundations of San Francisco’s iconic Golden Gate Bridge are due to be inspected in the next few months, and officials expect a clean bill of health for the bridge component.

The inspection, which takes place once every five years, is slated for as early as March, according to the San Francisco Examiner.

Golden Gate Bridge Inspection

In April 2018, inspection of the bridge’s towers began—the first detailed inspection of the towers in the structure’s 80-year history—revealing steel and concrete in good condition for the age of the span. (Construction was completed on the Golden Gate Bridge in 1937.)

Rich Niewiroski Jr., CC BY 2.5, via Wikipedia Commons

The foundations of San Francisco’s iconic Golden Gate Bridge are due to be inspected in the next few months, and officials expect a clean bill of health for the bridge component.

Earlier this month, the Golden Gate Bridge Highway and Transportation district was set to award a $262,000 contract to Infrastructure Engineers LLC to complete inspections and growth removal from the structure’s concrete base and foundation.

Deputy district engineer John Eberle noted that during inspection, vessels would use side-scan sonar, which is composed of high-resolution scanning equipment and penetrating radar, to read for any defects or issues in the structure and foundation. Upon completion of the scan, according to Eberle, divers are sent in teams of two, in dry suits, to begin inspecting the base.

Four or five tenders will remain above water to monitor the divers. Those underwater will mark a grid on the 700 square feet of concrete that composes the base of both towers. The grid will act as a guide for more detailed inspection and growth removal. Divers will work in five-hour shifts, and the process is slated to take up to two weeks.

Much of the inspection will be completed in poor visibility and guided by touch, and wire brushes, among other tools, will be used to remove growth.

The last inspection was completed in June 2014, noted Eberle. No significant issues were found at the time.

   

Tagged categories: Bridges; Historic Structures; Infrastructure; Inspection; NA; North America; Quality Control

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