Material and method for lubricating the metal surfaces of an earth-pressure tunnel boring machine
US6287052A · kind A · utility
4Cited by
17References
5Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 28, 1997 |
| Grant date | Sep 11, 2001 |
| Priority date | — |
| Expiry date | May 28, 2017 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21D9/0879
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A method of boring a tunnel with a tunnel boring machine comprising injecting into the formation to be bored just before the cutting tools of the boring machine and optionally into the internal discharge chamber of the boring machine, an aqueous foam containing at least one clay, at least one surfactant and at least one gas in proportion to produce a good quality, stable foam with the formation material and discharging the material from the tunnel via the discharge of the boring machine.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.