TRACK REALIGNMENT BY THE “HALLADE” METHOD

COURSE AIMS

This course is intended to provide a delegate with an in-depth knowledge in the surveying, calculation and design of track re-alignment schemes when using the “Hallade" method.

LEARNING OBJECTIVES

At the end of this course the delegates will: -

• Have a clear understanding of track geometry and track parameters, speed, curve, gradient etc
• Be able to demonstrate a clear understanding of the principles of the “Hallade” survey, including the use of relevant surveying equipment
• Have an understanding of the theory of overlapping chords
• Be able to demonstrate an understanding of design requirements and the relevant tolerances
• Understand the quarter chord theory
• Understand the transition theory – cubic parabola
• Have an understanding of the tangential changes of radius relating to the curvature of the track
• Be able to demonstrate a clear understanding of the method of employing couples
• Understand the relationship between a theodolite straight and Hallade curve
• Be aware of the requirements for making the track for on-track machines
• Be aware of Railway Group Standards, Network Rail Company Standards and D.O.T. requirements relating to track re-alignment schemes

COURSE DURATION

Ten days, consisting of two continuous five day modules, Monday – Friday.

PRE-REQUISITES

There are no particular educational or competence pre-requisites for the course. However, the following factors will benefit the delegates:-

• Prior technical experience of working on the maintenance/ renewal of the track
• Good numeric skills
• Prior basic skills in surveying and use of equipment

PERSONAL PROTECTIVE EQUIPMENT

This course requires the delegate to be on or near the running line, therefore, he/she MUST be in possession of: -

• Valid P. T. S. Certification
• Protective High Visibility Clothing
• Safety Footwear

The protective equipment must comply with current safety standards.

CERTIFICATION

The delegate is required to complete an examination to demonstrate his/her ability to complete a survey and design scheme using the “Hallade” Method.
Re-certification is not required.

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