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US 4,239,397 AGranted
Method for manufacturing shotcrete structures using a material having high impact resistance and optimum deformation properties
OwnerBertil Sandell, Gote Liljegreninventors
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Abstract
The invention refers to fibre reinforced shotcrete and it more particularly resides in an improved method for manufacturing structures of such concrete by means of shotcrete. According to the new method a dry mixture of a binding agent and ballast is supplied with chopped fibrous reinforcing material through a feed opening located in the spraying nozzle of the spraying apparatus upstream from the position in which water is added to the mixture.
Claims7
In a method of manufacturing shotcrete structures using a material having high impact resistance and optimum deformation properties, comprising in combination the steps of:
- A. pneumatically conveying a dry mixture of a water-activatable, binding agent and ballast material to an application nozzle having an outlet,
- B. mixing said dry mixture with a fibrous reinforcing material,
- C. introducing water into the application nozzle upstream of the nozzle outlet and activating the binding agent in the mixture which is to be pneumatically projected at a high velocity on to a surface, and
- D. spraying the activated mixture of water activated binding material, ballast material and fibrous reinforcing material onto a portion of a shotcrete structure being produced, the improvement comprising:
- E. introducing said dry mixture and said fibrous reinforcing material into the application nozzle in separate independent streams and effecting the mixing of said dry mixture with said fibrous reinforcing material within the application nozzle upstream of where the water is introduced into the application nozzle.
2 more elements
Dependencies are inferred from the claim text.