Method and apparatus for constructing an underground barrier wall structure
US6357968B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 12, 2000 |
| Grant date | Mar 19, 2002 |
| Priority date | — |
| Expiry date | Jan 12, 2020 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE02D2250/003
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A method and apparatus for constructing a underground barrier wall structure using a jet grout injector subassembly comprising a pair of primary nozzles and a plurality of secondary nozzles, the secondary nozzles having a smaller diameter than the primary nozzles, for injecting grout in directions other than the primary direction, which creates a barrier wall panel having a substantially uniform wall thickess. This invention addresses the problem of the weak “bow-tie” shape that is formed during conventional jet injection when using only a pair of primary nozzles. The improvement is accomplished by using at least four secondary nozzles, of smaller diameter, located on both sides of the primary nozzles. These additional secondary nozzles spray grout or permeable reactive materials in other directions optimized to fill in the thin regions of the bow-tie shape. The result is a panel with increased strength and substantially uniform wall thickness.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.