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Removing a connecting pin. Two workers stand on special platforms; the one on the other side (not visible) drives the pin out with a sledge while his mate pulls it free. The crane provides tension so the whole contraption doesn't collapse suddenly. You can see, on the other beam, where the pin has been stored in a special sleeve.

Removing a connecting pin.  Two workers stand on special platforms;
the one on the other side (not visible) drives the pin out with a
sledge while his mate pulls it free.  The crane provides tension so
the whole contraption doesn't collapse suddenly.  You can see, on the
other beam, where the pin has been stored in a special sleeve.