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
Landscapes
Engineering & Computer Science
(AREA)
Architecture
(AREA)
Mechanical Engineering
(AREA)
Civil Engineering
(AREA)
Structural Engineering
(AREA)
Apparatuses For Generation Of Mechanical Vibrations
(AREA)
Dispositif d'introduction de quantités dosées de matières pulvérulentes dans un fluide de propulsion pneumatique et application à l'injection de combustibles solides dans un four à cuve