Mobile train for backfilling tunnel liners with cement grout
US5141363A · kind A · utility
Inventor
Key dates
| Filing date | Apr 2, 1991 |
| Grant date | Aug 25, 1992 |
| Priority date | — |
| Expiry date | Apr 2, 2011 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02W30/91
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A mobile train for mixing foamed cement grout within a tunnel and injecting the grout into the annular cavity between the tunnel bore and liner. Cement slurry is suppled to the train through a conduit from a remote mixing plant, and finished foam is formed by a foam generator on the train and mixed with the cement slurry to form the fooamed cement grout. The train is movable longitudinally through the tunnel so that the liner can be grouted in segments while at the same time avoiding the need to pump the foamed cement grout over excessively long distance. The train is made up of several wheeled cars which are pulled through the tunnel by a tractor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.