LOS ANGELES — Repair crews on Thursday were shoring up a giant hole in the middle of Sunset Boulevard caused by a ruptured pipe, as officials at the water-logged University of California, Los Angeles, continued to assess damage from the 20 million gallons that inundated the campus.

Workers were reinforcing the excavated 56-by-41-foot crater and making the site safe for crews, said Mike Miller, district superintendent for the Los Angeles Department of Water and Power. Meanwhile, workers off-site were fashioning new valves and a Y-joint connector to replace the burst section of the century-old steel line.

The Department of Water and Power said work on the pipe itself was expected to be completed late Friday or early Saturday. Then work could begin on repairing the famed boulevard, a heavily traveled east-west thoroughfare, pushing reopening well into the weekend.

“There’s still just a lot of work to do out here,” Miller said. “We’re still shooting to have this done, at least the repair to the main by Friday.”