NR NR/CIV/SD/TUM/800 ISSUE F PDF

INTRODUCTION TO STANDARD DESIGNS AND DETAILS

The development of the Standard Designs and Details (SDD) has been undertaken by Network Rail to improve safety, asset reliability and increase efficiency. Their development is linked to Network Rail’s overall business objectives, to improve reliability of the railways and reduce the funding requirements for on-going management and maintenance of the network. The basis of the SDD focuses on two main areas that derive from these issues:

• Ensuring that the design meets Network Rail’s requirements

• The design is as successful as the designs of previous railway engineers, who built and maintained bridges that have given good service for approaching 150 years.

The use of the SDDs is promoted from the highest level within Network Rail.

The SDDs for the metallic underbridge repair and strengthening have been submitted and approved by Network Rail at Form A stage only of the Network Rail approvals process.

The purpose of the metallic underbridge repair and strengthening SDD was not to develop actual designs but to provide best practice guidance and details that can be used as reference when undertaking bridge specific strengthening designs.

The designer will need to produce a scheme specific Form A for the site under consideration. This Form A will detail the site specific parameters and the SDDs that will be used.

Following Form A approval the designer will need to undertake the detailed design and produce a full suite of scheme specific drawings, including general arrangement drawings, detailed design drawings and scheme specific details based around the SDD, where appropriate.

A Category II or III check of the site specific detailed design drawings is required.