Method for grouting pipe liners
US5791378A · kind A · utility
37Cited by
19References
22Claims
0Family size
Inventor
Key dates
| Filing date | Jun 27, 1995 |
| Grant date | Aug 11, 1998 |
| Priority date | — |
| Expiry date | Jun 27, 2015 |
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 liner pipes. 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 pressure at which the grout is injected into the cavity is maintained at or below a predetermined maximum pressure, so as to avoid collapsing the liner pipe.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.