primary overflow

I brewed a Belgian double (1.094 O.G.) last night and pitched a wyeast 3787 Trappist yeast, and had great fermentation within 12 hours. I thought I gave enough head space for this beer only to find out later that I had an overflow problem. I can get the krosen to drop temporarily, by gently shaking my carboy, but within 10 min. the brew is bubbling through my air lock. Any Ideas on a quick fix. Also, is this enough yeast to handle this high gravity beer, or should I look into another patchable?

Hook up a blowoff tube to the airlock or directly to the hole. Run the tube into a bucket of sanitizer next to the fermenter.

I'd go with a blowoff tube directly in the mouth of the carboy, to a bucket. That will get the tube full of crap but your fermentation will continue on happily.