Installing a bridge expansion joint - GIF

Installing a bridge expansion joint.

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Previously:

Mechanical forming an expansion joint - GIF
Workers between a bridge expansion joint - GIF

Why didn't they put it in originally?

These expansion joints wear out, & they can be damaged by environmental factors. Replacement is generally scheduled preventive maintenance, but sometimes, as on the Richmond (CA) bridge about a year ago, it has to be done as an emergency repair.