mtm design practice note installation of bladeless turnouts/crossings · mtm design practice note...

MTM DESIGN PRACTICE NOTE INSTALLATION OF BLADELESS

TURNOUTS/CROSSINGS L1-NAM-INS-003 Version: 1 Effective from: 15th June 2012

Approving Manager: Network Asset Manager Approval Date: 15/06/2012 Next Review Date: 15/06/2015 PRINTOUT MAY NOT BE UP-TO-DATE; REFER TO METRO INTRANET FOR THE LATEST VERSION of 12

Approval

Amendment Record

Approval Date Version Description 15/06/2012 1 Initial Issue under MTM




1 Purpose The purpose of this design practice note is to allow the installation of

turnouts/crossings into operational track where it is NOT intended to “detect” points in the signalling system. This can be done by removing the point blades and straight railing, the through or the diverge move of a turnout or crossing.

2 Scope This design practice note shall be applicable to all types of turnout/crossing

installations used on the MTM network. The turnout and crossing types include, but are not limited to, the following points and crossings arrangements:-

1 in 7.52

1 in 8.25

1 in 9

1 in 15

1 in 21

Compound Crossings (Single and Double Compound) inclusive of crossing angles as listed above.

3 Background Points and crossings for turnouts are normally installed during track work construction

planned in conjunction with the commissioning of the signalling system. Points installed in main line track must be detected by the signalling system.

This may require an extended occupation window which may not be practical to accommodate.

In some cases it is intended to install turnouts and crossings, with point blades removed, prior to planned signal commissioning occupations. This will optimise occupation windows by allowing some earthworks, installation of concrete bearers and the staging of turnout and crossing installation that can be carried out prior to completion of signalling designs and final commissioning of signalling system.

The process of removing point blades and “straight railing” the track, as a temporary configuration, has been used in the past on MTM projects such as South Morang, Flinders Street track upgrade and RRL temporary track realignment works for WP-A .

The process enables the installation of turnouts without the need for signal detection and reduces the work load required during the occupation window and allows for more efficient construction. Straight railing of the turnout/s may be undertaken to allow the movement through the straight or the diverge as required by train operations.




4 The Issue The procedure for securing “Not in Service” mainline points is defined in the MTM Operational Procedure, L1-SWS-PRO 002 – Securing “Not in Service” Main Line.

Removing the point blades and straight railing the track will enable the installation of proposed turnout/crossing without the need to provide signal detection as specified in the above procedure.

5 The Requirement This Design Practice Note will approve the construction methodology to allow turnouts and crossings to be partially installed in track, without the point blades fitted. This can be done by “straight railing” the through or the diverge move of the turnout or crossing.

This arrangement can be fitted to standard concrete bearers by installing special plates specifically designed to match the turnout configuration and enable straight railing of the through or diverge move.

All the plating components must be designed by the manufacturer to match the turnout configuration and satisfy the proposed network configuration and meet current operational requirements. This must be done prior to any installation works and approved by MTM operations.

An Operational Circular must be issued to notify maintenance and operational staff regarding the proposed temporary configuration of turnouts and crossings to be installed in track without the point blades fitted.

Drawings of the proposed straight railing solution and components shall be supplied to the MTM Engineering Design Review team for review prior to installation. An example of the plans developed by Vossloh Cogifer Australia (VCA) to enable straight railing on concrete bearers is attached in Appendix A for reference.

A similar process can be adopted for straight railing turnouts and crossings on timber bearers.

6 Type Approval The suitability of any new turnouts that have not been previously used on the MTM network will need to satisfy the MTM Type Approval process. This must occur before the installation of turnouts and crossings, as defined in this Design Practice Note, can be applied.

7 References & Legislations L1-SWS-PRO-002 - Securing “Not in Service” Mainline Points




8 Appendices

APPENDIX A – VCA Straight Railing Drawings 1. A3B16069A - Straight Railing – Through switch zone of 1 in 9, RH Tangential

Turnout Assembly

2. A3B16070A - Plating for straight rail for switch zone, 1 in 9, R250, RH, Turnout

3. A3B16071A - Plating for straight rail for switch zone, 1 in 9, R250, RH, Turnout

4. A3B16073A - Straight Railing – Through switch zone of 1 in 9, LH Tangential Turnout Assembly

5. A3B16074A – Plating for straight rail for switch zone, 1 in 9, R250, LH, Turnout

6. A3B16075A - Plating for straight rail for switch zone, 1 in 9, R250, LH, Turnout

7. A3B16076B - Plating for straight rail for switch zone, 1 in 9, R250, RH, Turnout

8. A3B16077B - Plating for straight rail for switch zone, 1 in 9, R250, LH, Turnout

mtm design practice note installation of bladeless turnouts/crossings · mtm design practice note...

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