Undertrack Crossings and Pressure Pipelines

Transcription

1 Railway Group Standard Undertrack Crossings and Pressure Signatures removed from electronic version Submitted by... Frank Hardy Nominated Responsible Manager Approved by Synopsis Sets out requirements to be followed when considering the provision of undertrack crossings for services and pressure pipelines.... Tom Stevenson Chairman, Civil Engineering Subject Committee Authorised by... Michael Harwood Chairman, Operations Standards Subject Committee for Controller, Safety Standards This document is the property of Railtrack PLC. It shall not be reproduced in whole or in part without the written permission of the Controller, Safety Standards, Railtrack PLC. Published by Safety & Standards Directorate Railtrack PLC Floor 2, Fitzroy House 355 Euston Road London NW1 3AG Copyright 1996 Railtrack PLC

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3 Railway Group Standard Page 1 of 10 Contents Section Description Page Part A Issue record 2 Responsibilities and distribution 2 Compliance 2 Health and Safety Responsibilities 2 Supply 2 Part B 1 Purpose 3 2 Scope 3 3 Definitions 3 4 Principle 4 5 Competency 4 6 General 4 7 Design and Construction of Undertrack Crossings 5 8 Marking and Records 7 9 Provision for Future Renewal of Service 7 10 Abandonment or Change of Use 7 11 Slab Track 8 12 Particular Requirements for Pressure 8 References 10 R A I L T R A C K 1

4 Railway Group Standard Page 2 of 10 Withdrawn Document Part A Issue record This standard will be updated when necessary by distribution of a complete replacement. Amended or additional parts of revised pages will be marked by a vertical black line in the adjacent margin. Issue Date Comments 1 Jan 1996 Supersedes GC/TP0656 Requirements for Undertrack Crossings and GC/TC0483 Pressure Constructed on or adjacent to Railway Property which are now withdrawn. Responsibilities and distribution All persons within the Railway Group responsible for planning, execution or supervision of work on must be familiar with the contents of this document. Compliance The provisions of this Railway Group Standard are for new projects commencing on and after 6 April The listing of all existing must be completed by 1 January Health and Safety Responsibilities In authorising this Standard, Railtrack PLC makes no warranties, express or implied, that compliance with all or any of Railway Group Standards is sufficient on its own to ensure safe systems of work or operation. Each user is reminded of its own responsibilities to ensure health and safety at work and its individual duties under health and safety legislation. Supply Controlled and uncontrolled copies of this standard must be obtained from The Catalogue Secretary, Safety and Standards Directorate, Railtrack PLC, Floor 2, Fitzroy House, 355 Euston Road, London NW1 3AG. 2 R A I L T R A C K

5 Railway Group Standard Page 3 of 10 Part B 1 Purpose This Railway Group Standard gives the minimum requirements for the planning and execution of on Railtrack owned and/or controlled land. 2 Scope The contents of this Railway Group Standard apply to: a) all new projects executed on behalf of Railtrack and Outside Parties for ; b) all persons within Railtrack responsible for planning, managing and executing work on on Railtrack owned and/or controlled land. c) all existing (see Sections 8 and 10) This Railway Group Standard does not apply to independent structures carrying pipes and Services over the railway. 3 Definitions Minimum Depth means the depth of the service measured from Rail Level to the top of the highest part of the surround, pipe, sleeve or tunnel. Open Cut Method means that the Service is laid in a trench excavated by hand or by machine. Outside Parties means any organisation other than Railtrack and includes public utilities and statutory authorities. Pressure Pipeline means a pipeline containing a liquid or gas at a pressure greater than 1 bar. Rail Level means the level of the top of the lowest rail crossing above the Service. Railtrack means Railtrack PLC which is incorporated as a registered company in England and Wales as No Railtrack Director s Nominee (RDN) means the Railtrack manager having appropriate qualification and/or experience with delegated responsibility for all or part of the infrastructure within a defined geographical area or discipline. Railway Service A Service directly required for the operation of the railway infrastructure. R A I L T R A C K 3

6 Railway Group Standard Page 4 of 10 Withdrawn Document Service means a cable, pipe or pipeline laid or constructed by any method. The cable, pipe or pipeline may be contained in a protective duct or laid without any protection. For the purposes of this Railway Group Standard, the term includes Pressure. Undertrack Crossing means a Service passing under the track(s) below the level of the underside of the sleepers or track slab. The term includes Undertrack Crossings constructed by Open Cut Method, tunnelling, pipe jacking, thrustboring or ramming. For the purposes of this Railway Group Standard the term excludes Services laid in the roadway beneath a bridge span. 4 Principle This Railway Group Standard has been provided to address part of the HMRI Principles that earthworks and structures supporting the track should be capable of carrying and transferring the load of permitted traffic and earthworks and structures above or adjacent to the railway should be capable of supporting the loads imposed upon them and afford protection to the railway system. It also addresses the need to prevent the importation of risk to the railway arising from the presence of Pressure. Additionally, the Service must be protected from the risk of damage from track maintenance activities by being laid at an adequate depth below the track. 5 Competency 5.1 The appropriate Director within Railtrack must ensure that the responsibilities of all persons responsible for the planning, management and execution of work on Undertrack Crossings on behalf of Railtrack are clearly defined in writing and understood by these persons. 5.2 The Railtrack Director s Nominee (RDN) must ensure that persons undertaking duties in accordance with this Railway Group Standard possess the necessary skills, expertise and training to carry out those duties to an appropriate level of competency. 6 General 6.1 Site Investigation The RDN must ensure that, where appropriate, a site investigation is undertaken to determine the material through which any Undertrack Crossing is to be made, and the results of this investigation must be used to assist in the selection of a suitable method of construction. 4 R A I L T R A C K

7 Railway Group Standard Page 5 of Existing Services and Obstructions Existing Services and obstructions must be located before commencing work on any underground Service. BURIED SERVICES SHOULD ALWAYS BE ASSUMED TO BE PRESENT UNLESS IT IS PROVED OTHERWISE. Attention is drawn to the provisions of Railway Group Standard GC/RT5200 Excavations and Identification of Services. 6.3 Work Carried out by Outside Parties The Special Requirements in Appendix B of Railway Group Standard GC/RT5131 Requirements for Processing Outside Party Development Proposals must be included without alteration in contracts prepared by Outside Parties. If necessary, the RDN must specify any special engineering conditions, appropriate to the site and in addition to the Special Requirements, that are to be observed by the Outside Party and/or their contractors during construction as appropriate to the site and intended use of the Undertrack Crossing. All terms and documentation permitting occupation of or licence under land owned by Railtrack must be negotiated with Railtrack Property and agreed before the start of any work at site. 6.4 Areas of Mineral Extraction Where Railtrack becomes aware that mineral extraction is likely to affect a Service or Pressure Pipeline, procedures must be in place to advise the user and/or owner of the Service or Pressure Pipeline. 7 Design and 7.1 Selection of method of construction Construction of Undertrack Crossings When selecting a method for construction of an Undertrack Crossing, the following must be considered: the effect on track alignment, both vertical and horizontal; the accuracy of alignment of the proposed method of construction of the Service during construction; the future enlargement, renewal or replacement of the Service (see Section 9). 7.2 Depth of Construction The Minimum Depth applies within 1.4 metres of the running edge of the nearest rail measured horizontally. R A I L T R A C K 5

8 Railway Group Standard Page 6 of 10 Withdrawn Document Open-Cut Method Pressure laid by the Open Cut Method must be laid at a Minimum Depth of 2.0 metres below Rail Level. Other Undertrack Crossings constructed by the Open Cut Method must be laid at a Minimum Depth of 1.1 metres below Rail Level Other Methods Undertrack Crossings constructed other than by the Open Cut Method must be placed at a Minimum Depth of 2.0 metres below Rail Level Track Drainage and Railway Services In exceptional cases, track drainage pipes and Railway Services may be laid at a depth less than that specified in Section subject to the specific written approval of the RDN. 7.3 Alignment and Position As far as reasonably practicable, all Undertrack Crossings must be positioned such that tracks are crossed in a direction at right angles to the rails. No point of any Undertrack Crossing must be less than 3.0 metres measured horizontally from the nearest overhead electrification mast or other structure as far as is reasonably practicable. 7.4 Design The pipe, sleeve or duct and any surround under the tracks and within 2.0 metres of the sleeper ends must be designed to be adequate to carry the imposed loading from the track. Where appropriate, the design of temporary works must afford adequate support to the tracks. 7.5 Access Manholes, Thrust and Reception Pits The RDN must consider the following points when determining the location of access manholes, thrust and reception pits: access during construction; access for maintenance after completion; fixing of covers. 7.6 Cathodic Protection Where a steel pipeline crosses the railway in an Undertrack Crossing, where appropriate the RDN must advise the pipeline owner of the requirements of Railway Group Standard GM/RT1018 D.C.Traction - Stray Current and Cathodic Protection - Control of their undesirable effects. 6 R A I L T R A C K

9 Railway Group Standard Page 7 of Shut-off valves Wherever practicable, shut-off valves must be provided at or near both railway boundaries to prevent leakage of fluids and gases onto Railtrack land. 8 Marking and 8.1 Marking of the route Records The RDN must give consideration to the provision of marker plates at the railway boundaries, and at any changes of the line of the route. Where marker plates are provided, the minimum information shown must include: position and depth of Service; emergency contact point and telephone number. Consideration must be given to the provision of warning tape with a metallic core at Undertrack Crossings constructed by Open Cut Methods, provided that the tape is placed at a depth greater than 1.1 metres below Rail Level. 8.2 Records of Location Railtrack must ensure that procedures are in place for recording the location of all Undertrack Crossings. The records must include, as a minimum, the following details: the location of the Undertrack Crossing; depth of the Undertrack Crossing measured from Rail Level to the top of the Service or any surround; number of ducts, where applicable; user and/or owner of the Undertrack Crossing, point of contact and details of the service. The procedures must include provision of notification of the presence of a new Service to those persons within Railtrack whose activities may be affected by the existence of the Service. The records must be maintained for the lifetime of any part of the physical structure of the Undertrack Crossing. Records of the construction details must be retained in accordance with the requirements of Railway Group Standard GC/RT5142 Management of Infrastructure and Property Records. 9 Provision for Future As far as reasonably practicable, a Service must be laid within a sleeve or Renewal of Service duct to facilitate renewal in the future without the need for either excavation or access to the railway. 10 Abandonment or 10.1 Abandonment of an Existing Service Change of Use When information is received that an existing Service may no longer be in use, the RDN must seek written confirmation from the user and/or owner that the Service has been disconnected and made safe. R A I L T R A C K 7

10 Railway Group Standard Page 8 of 10 Withdrawn Document The RDN must give consideration to complete removal of the Service from Railtrack land. Where this is not reasonably practicable, consideration must be given to: purging the pipe or pipeline to remove all toxic, flammable or hazardous substances; maintenance of cathodic protection; filling the void with an inert material to prevent future collapse. Appropriate written confirmation must be obtained from the user and/or owner that all actions required by the RDN have been carried out, and that auditable maintenance arrangements have been made to protect the railway. ` 10.2 Change of Use for a New Service No change of use of a Service executed in accordance with this Railway Group Standard must be allowed without the prior agreement of the RDN. 11 Slab Track The design of the slab and the soil characteristics must be taken into account when determining the method of construction and depth of cover of Undertrack Crossings to ensure that the design assumptions made for the slab are not invalidated by the construction and/or existence of the Service. 12 Particular Pressure must be laid in accordance with the requirements for Requirements for Undertrack Crossings in Sections 6 to 11 inclusive with the following Pressure additions General Requirements for Installation The RDN must ensure that appropriate conditions are imposed for the protection of Railtrack during the construction and subsequent life of the pipeline. When formulating the conditions, consideration must include the following: risk of damage to the pipeline from derailment; risk to Railtrack from failure of the pipeline; risk of fire, explosion or pollution due to the presence of the pipeline; use of increased pressures during testing The RDN must, in consultation with other bodies as necessary, and taking into account any possible future development such as electrification, be satisfied as to the suitability of the site of the crossing proposed by the pipeline user/owner, and indicate the preferred actual position of the crossing taking into account areas where the bank or formation is unsuitable, areas containing combustible material, position of overhead masts, culverts etc. 8 R A I L T R A C K

11 Railway Group Standard Page 9 of Emergency 24-hour contact arrangements must be agreed before a Pressure Pipeline is brought into use. These arrangements must follow the principles contained in Appendix B.2.1 of Railway Group Standard GO/RT3408 Accident and Emergency Planning, Pressure must not be attached to structures owned by Railtrack or to any bridge over the railway other than in exceptional circumstances. In no cases must they prevent access for maintenance or examination of the structure Pressure in areas of Mineral Extraction Where major crossings are proposed in areas prone to subsidence, the promoter must obtain an up-to-date mining stability report giving details of past mining activity and estimates of any subsidence and ground strains at the site of the crossings. The RDN must ensure that procedures are in place to forward the mining stability report to the Mining Contact, as defined in Railway Group Standard GC/RT5152 Mineral Extraction - Controlling the Risk. The Mining Contact must be consulted to advise on the adequacy of the provisions in regard to the anticipated ground movement. R A I L T R A C K 9

12 Railway Group Standard Page 10 of 10 Withdrawn Document References Railway Group Standards GC/RT5131 Requirements for Processing Outside Party Development Proposals GC/RT5142 Management of Infrastructure and Property Records GC/RT5152 Mineral Extraction - Controlling the Risk. GC/RT5200 Excavations and the Identification of Services GM/RT1018 D.C.Traction - Stray Current and Cathodic Protection - Control of their undesirable effects GO/RT3408 Accident and Emergency Planning Other Related GM/RT1103 Mechanical Protection and Marking of Buried Services Railway Group GO/RT3278 Requirements for Access to Railtrack PLC Controlled Standards Infrastructure GC/RT 5101 Technical Approval Requirements for Changes to the Infrastructure 10 R A I L T R A C K