US 4,046,357 A · Shotcrete accelerator injection apparatus and method

Abstract

An air driven positive displacement pump is positioned to take a suction from a source of shotcrete accelerator. A shotcrete applicator tube receives pressurized shotcrete from a source thereof. A manifold is adapted to the applicator which has a first inlet connected to the output of the pump to receive accelerator at a pressure in excess of the pressure of the shotcrete passing through the applicator. The manifold also has a second inlet connected to an external source of compressed air to receive compressed air at a pressure higher than the pressure of the shotcrete passing through the shotcrete applicator. The manifold has a body in which the accelerator and compressed air from the first and second inlets respectively are intermixed. The manifold has at least two outlets positioned about the applicator to inject the accelerator and air mixture into shotcrete passing therethrough.

Claims12

Dependent claims

A method of injecting shotcrete accelerator into a flowing shotcrete slurry prior to application thereof by and through a shotcrete applicator connected to receive said shotcrete slurry under pressure, said method being comprised of:

supplying shotcrete accelerator to said applicator at a pressure in excess of the pressure of said shotcrete slurry as it passes through said applicator;
supplying compressed air to said applicator at a pressure in excess of the pressure of said shotcrete slurry as it passes through said applicator;
intermixing said shotcrete accelerator and said compressed air together in the vicinity of said applicator;
and
injecting the mixture of said accelerator and said compressed air into the shotcrete slurry in said applicator to intermix therewith as said shotcrete passes through said applicator.

2 more elements

Apparatus for applying shotcrete comprised of:

a source of shotcrete under pressure;
a source of shotcrete accelerator;
first and second sources of compressed air;
an air driven positive displacement pump connected to said first source of compressed air to be driven thereby and positioned and connected to take a suction from said source of shotcrete accelerator and to supply shotcrete accelerator under pressure at its output;
an accumulator having an inlet and an outlet, said inlet being connected to receive the output of said pump;
a shotcrete applicator connected to the source of shotcrete to receive shotcrete under pressure therefrom;
an accelerator injection manifold positioned along the length of said applicator, said manifold having:
a first inlet connected to the outlet of said accumulator to receive shotcrete accelerator therefrom,
a second inlet connected to said second source of compressed air to receive compressed air therefrom,
a body in which said compressed air and said shotcrete accelerator are intermixed, and
a plurality of outlets connected to said applicator to inject the mixture of compressed air and shotcrete accelerator into the shotcrete in said applicator.

8 more elements

Dependencies are inferred from the claim text.

Shotcrete accelerator injection apparatus and method

Life of this patent

Shotcrete accelerator injection apparatus and method

Life of this patent

Abstract

Claims12