Method and apparatus for continuous mixing and injection of foamed cement grout
US5419632A · kind A · utility
Inventor
Key dates
| Filing date | Sep 26, 1994 |
| Grant date | May 30, 1995 |
| Priority date | — |
| Expiry date | Sep 26, 2014 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE04G21/0472
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
An apparatus and method for the continuous generation and placement of a foamed cement grout. The assembly is mounted on a fixed or mobile frame. There is a continuous foam generator, and this supplies finished foam to an intake port of a screw-type, positive-displacement pump. Cement slurry is also supplied to the intake portion of the pump, and this is mixed with the foam in the body of the pump and discharged from this through a conduit to the injection site on a continuous basis. The ratios of foam and slurry can be adjusted on a continuous basis to compensate for variations in grout quality which are observed at the injection site. The assembly is also provided with an onboard power generator and a water pump for flushing the grout out of the injection lines.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.