FR663325A -
Method and device for introducing materials to great depths, in particular for introducing backfill into pits, shafts, etc., by means of air
- Google Patents
Method and device for introducing materials to great depths, in particular for introducing backfill into pits, shafts, etc., by means of air
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E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
E21F15/00—Methods or devices for placing filling-up materials in underground workings
E21F15/08—Filling-up hydraulically or pneumatically
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FR663325D1927-11-031928-11-02
Method and device for introducing materials to great depths, in particular for introducing backfill into pits, shafts, etc., by means of air
ExpiredFR663325A
(en)
Method and installation for pneumatic transport of materials over rather considerable distances, in particular for the purpose of bringing backfill materials into pits, shafts, etc.
Method and device for introducing backfill into pits, shafts, etc., in the form of briquettes, and for producing briquettes from material serving as backfill