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E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
E04G21/02—Conveying or working-up concrete or similar masses able to be heaped or cast
E04G21/06—Solidifying concrete, e.g. by application of vacuum before hardening
E04G21/08—Internal vibrators, e.g. needle vibrators
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FR732261D1931-04-291931-04-29
Method and devices for compacting concrete by endopulsations in concrete constructions, reinforced or not
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