[concretebob]

Most (concrete, H-beam, and shell pile) hammers are diesel...(Delmag, Bucyrus Erie) although sheet pile (Z pile) hammers can be pneumatic or hydraulic vibratory, which also serve a dual purpose as pile extractors.

Looks like the center span broke loose and caused the approach on one side to rock back on its piers.
The bridge looks to be a self-supporting pin and ring suspension. It's designed to flex vertically.

[spunkets]

"Looks like the center span broke loose and caused the approach on one side to rock back on its piers."

I just have a dialup and couldn't get a decent pic.

"Most (concrete, H-beam, and shell pile) hammers are diesel...(Delmag, Bucyrus Erie)"

I see. 75K ftlbs/whack.

Thanks.

[BobS]

You seem to know about things. A good engineering idea came out of the '94 earthquaqe in Northridge a mile from here and 3 miles north where the 118 FWY connects to the 405. That FWY collapsed and the big re-bar pillars were cracked. The repair involved tightly encasing the new re-bar concrete pillars in 3/4" rolled sheet steel. Probably 4140 heavy steel. And doing more with the base.

Pray for a good idea to come out of this disaster from someone. Like building to earthquake standards.