Download LB-44 Get More Power Out of Dual or Quad Op-Amps (Application Note from National Semiconductor, 1979, 2 pages, 57 KB pdf)
This short app note shows you how you can share the load between several op amps. Figure 2 is the most interesting because it shows a sheme that can be expanded to an arbitrary number of op amps, at least in theory. If the number of required op amps would get too high, it might be a better solution to drive a pair of power transistors from the output of a single op amp.
You might also be interested in the other app notes and columns by Bob Pease.
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