Rail joint bridges
Rail joint bridges are installed on floating joints on a track that is carried on wooden sleepers. Should a joint bridge additionally be fitted, two foot clamps, one wedge plate and four long coupling screws with double spring washers are necessary.
The foot clamps surround the rail foot and the wedge plate. They are fastened by the coupling screws.
In the centre of the wedge plate there is a long hole under the rail joint gap. The hole is located in a way that the rain water can run off and the formation of rust can be contained.
The coupling screws between the rail foot and wedge plate are square which prevents the screws from loosening. The coupling screws are fitted in different ways, i.e. the screws are put in alternately from the left and the right (see pictures).
When installing these bridges, it is very important to tighten the fish plates from the inside to the outside so that no stress can occur within the connection.
Here in the installed condition:
You can find suitable specialist literature to the topic here:
The Basic Principles of Mechanised Track Maintenance
This book is dedicated to the many people involved in the day to day planning and performance of track maintenance activities. Providing a practical approach to everyday challenges in mechanised track maintenance, it is not just intended as a theoretical approach to the track system.
Railways aim at transporting people and freight safely, rapidly, regularly, comfortably and on time from one place to another. This book is directed to track infrastructure departments contributing to the above objective by ensuring the track infrastructure’s reliability, availability, maintainability and safety – denoted by the acronym RAMS. Regular, effective and affordable track maintenance enable RAMS to be achieved.
Best Practice in Track Maintenance, Vol 1 - Infrastructure Management
Infrastructure Management Volume 1 looks at aspects of infrastructure management with particular reference to the single European railway area. Based on best-practice examples from Central Europe, measures for the targeted retrofitting and improvement of the infrastructure maintenance of the existing network are presented. In many cases, infrastructure operators are faced with a generational change, which accelerates the process. Modern information and communication technology can simplify the comprehension and presentation of complex contexts. Modified approaches to asset management and life-cycle management enable implementation of the "transparent permanent way" or the "railway 4.0".