Precast reinforced concrete railway crossing slab
US5924630A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 21, 1997 |
| Grant date | Jul 20, 1999 |
| Priority date | — |
| Expiry date | Jul 21, 2017 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE01B2204/11
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
The present invention discloses a precast railway crossing slab adapted to extend transversely across the surface of conventional railway ties, with slots or gaps dimensioned and disposed to receive a pair of railway rails therethrough. The crossing slab includes a post-tensioning system in which metal cable strands or tendons are sheathed within plastic tubes and are positioned in the slab mold frame prior to pouring of concrete. Tendon anchors are also disposed in the slab mold frame prior to pouring. After the concrete hardens, a hydraulic jack is used to tension and anchor the tendons in a stressed condition, thus providing reinforcement to the slab. The railway crossing slab of the present invention may be utilized with or without surface or edge metal plating. Flange way fillers which typically comprise rubber strips extending between the sidewalls of the metal rail and the concrete slab may optionally be employed. The slab may be formed integrally with grooves to receive the rails, or alternatively may take the form of three separate slabs provided with screw holes for securement to conventional wooden or concrete railway ties.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.