This technology is a marine rock demolition method that breaks rock by inserting a demolition container—consisting of an elastic bag and a threaded watertight sealing cap—into a hole drilled in the marine rock, and then injecting an expansion agent into the container through a hose, rather than pouring the silent chemical expansion agent directly into the hole.
Marine rock demolition has traditionally relied on dynamite blasting or breaker methods, which cause noise, safety issues from explosions, complaints from nearby residents and cultural heritage sites, and disruption to marine ecosystems. Silent chemical expansion agents, an alternative, are typically poured directly into holes and sealed with corks; however, they often fail to perform effectively because they mix with seawater or are washed away by waves, preventing them from hardening properly.
In this technology, a bag with a narrow opening and a wide base is secured to the watertight sealing cap, and an O-ring band on the cap's outer surface adheres to the hole wall to keep the container stable. After injecting the expansion agent through a primary pipe, which forces water out of the hole, the gap is filled with underwater epoxy filler. The pipe is then removed, and a finishing cap is screwed on to seal the unit. This method can be used for harbor dredging, channel expansion, offshore wind and bridge foundation excavation, and removing underwater reefs near cultural sites or fish farms. It delivers expansion force directly to the rock wall without blasting vibrations or noise, minimizing environmental impact and public complaints.
This invention was developed with support from the Ministry of Education for the development of marine rock demolition technology using silent chemical expansion agents.
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