Water flow patch
US5180270A · kind A · utility
Inventors
Key dates
| Filing date | Jun 17, 1991 |
| Grant date | Jan 19, 1993 |
| Priority date | — |
| Expiry date | Jun 17, 2011 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21D11/383
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A seal for leaking fissures or faults of a tunnel which has a first, deformable layer with two surfaces, one of which is scalloped in vertical cross-sectional dimension and the other of which abuts a second flexible layer of more dense material such as neoprene. The surface of the second layer remote from the first layer is overlain about its periphery by strapping preferably made from steel. The seals are generally rectangular in horizontal plan and if the seal is sufficiently elongated intermediate strappings are provided between the width end straps as required. A plurality of registering apertures are provided in the first and second layers and the strapping material to receive therethrough elongated self-threading concrete screws for securing the seal into pilot holes in the tunnel surface around a leaking fissure or fault.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.