Method for grouting cavities using a pumpable cement grout
US5241993A · kind A · utility
Inventor
Key dates
| Filing date | Aug 20, 1991 |
| Grant date | Sep 7, 1993 |
| Priority date | — |
| Expiry date | Aug 20, 2011 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE03F2003/065
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A pumpable cement grout and method for use thereof for grouting annular cavities. The pumpable cement grout is a mixture of a hydraulic cement, water in an amount sufficient so that the water-to-cement ratio of the grout is from about 0.60 to about 1.00 by weight, and pregenerated aqueous foam in an amount sufficient to adjust the wet density of the grout to a value of from about 48 to about 72 pounds per cubic foot. The grout is pumped into an annular cavity formed intermediate a tubular external member and an internal member disposed in the tubular external member, so that the grout fills this cavity by flowing in a generally longitudinal direction therethrough. The tubular external member may be a concrete sewer pipe, and the internal member may be a plastic liner pipe. The pressure at which the grout is injected into the annular cavity is maintained at or below a predetermined maximum pressure, so as to avoid collapsing the plastic liner pipe.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.