CASE STUDIES

SURVEY & DESIGN

CABLE ROUTE MANAGEMENT SYSTEMS (CRMS)

Managing the project required the generation of multiple design options. This necessitated flexibility and a process that enabled the project to be delivered to LU’s lead time requirements.

 

A key challenge of the new CRMS for the Neasden Depot was finding the most cost effective and practicable solution for supporting the new cable route on the existing TMR over track crossing bridge. This involved reviewing a previous design (by others), which involved placing cables on the bridge structure and concluding that it would not be adequate to carry the loads imposed by the CMS in addition to associated walkways and railings required. SRC then proposed a totally new solution which attached the cables to the girder below the deck. This imposed a smaller and acceptable load on the bridge and consequently proved to be a cheaper solution.

 

Neasden - New CRMS and TMR Bridge Structural Design

This commission involved the design and installation of a complete new cable route throughout Neasden Depot and a new lighting and earthing arrangement on the main depot bridge (known as the TMR bridge). Delivering this commission successfully involved a high level of collaborative working between SRC and the Principal Contractor; Giffen Group. The fixed time constraints (the project was planned around a series of LU possessions at various parts of the depot) presented a challenge to SRC to deliver the designs on time. SRC engineers had to be very flexible in their working hours for the duration of this commission.

 

Carl Messer, Giffen Group’s Construction Manager

 “SRC were the only design house that could achieve these timescales and meet the rigorous assurance requirements of our Client, London Underground. The team’s dedication and responsiveness really made the difference in winning and delivering this work.”

Edgware Road

SRC was commissioned by KN Network Services to provide the detailed design and associated assurance for a new signalling cable management system throughout Edgware Road (Circle Line) station. It was principally a Civil engineering design developed closely with KN and LU to ensure robustness, buildability and cost-effectiveness. Edgware Road is already heavily congested with cable runs which provided the design team with some challenging pinch points. Another complicating factor was that the location and specification of the ends of the runs, the signal equipment room (SER) and the equipment to be controlled, were evolving at the same time as the CRMS design itself.

 

To resolve the issue of the design development starting without all the relevant information being available, SRC and KN split the design into two separate phases so that the majority of the route could be installed while the final locations of the equipment and SER were decided. SRC worked closely with the LU Project Engineer through-out to ensure that the designs were acceptable to all LU stakeholders. This commission has allowed SRC successfully to develop a close collaborative method of working with KN and to refine our process for delivering CRMS design packs to maximise clarity, constructability and ease of use.

 

CIVIL & STRUCTURAL ENABLING

JNUP Safe load assessments of new Cable Route Management Systems (CRMS)

As part of its substantial upgrade programme, Tube Lines has been installing new cable management systems fixed to existing structures throughout the Jubilee and Northern Lines. SRC was commissioned to carry out Civil Engineering safe load assessments of proposed CMS routes to confirm that the structures will not be damaged by the additional loads imposed upon them.

 

The main challenge in this commission was organisational. It was necessary to ensure that submissions could be delivered on time, while allowing the team to attend the many meetings and engineering shifts that were needed to verify that the designs were progressing in accordance with the requirements of the other parties involved.

 

By managing the Civil Engineering resource efficiently and effectively, SRC was able to manage the process of assessing the proposed CMS on behalf of Tube Lines successfully and efficiently.

 

Chris Perryman, Tube Lines

”The key to the success of this operation was the collaborative working between our CMS installation teams and SRC’s designers and engineers.”

 

SRC worked with the LU Lifts and Escalator Department at three LU stations. We supported projects for the replacement of escalators at Bank, checking the construction method on temporary and permanent steelwork in the Escalator Machine Room in Oxford Circus, and the designs for steelwork replacement and strengthening works in Earls Court lift shaft tower frame.

 

The work involved structural steelwork design and structural mechanics involving ropes and pulleys as well as understanding the effects of the construction sequence on the existing and proposed structures and the challenge of fitting the proposed designs within the restricted existing available space.

 

Solutions were found by clearly defining the objective of the project, then identifying smaller individual segments of tasks and putting together known workable solutions before assembling them. SRC embedded engineers in the Client’s team, as a shortage of suitably skilled personnel was identified within LU. To ensure the projects proceeded satisfactorily SRC utilised specialist software (MathCAD and STAAD.Pro) and gained expert knowledge of procedures specific to LU Lifts and Escalators.

 

Understanding and coordinating with the Electrical and Mechanical engineering aspects of the projects was an important aspect of this work. Obtaining information in time from sub-contractors and suppliers to incorporate in design and managing to deal with changing input information without affecting the final delivery time and budget posed a number of problems all of which were successfully overcome.

 

London Underground Lifts and Escalators Department

The scope of SRC’s work at Earl's Court was chiefly Civil Engineering and Technical Assurance. SRC was required to undertake the design and assurance work to build a new room on an island platform, re-instate heritage features within the station, and assist in compiling the final handover file for the Station Modernisation.

 

There were significant challenges involved in agreeing the approach for the re-instatement of the heritage features. SRC resolved these issues through proactive engagement with the stakeholders and authorities, and detailed research into the arrangements agreed in similar situations. This demonstrated that SRC’s streamlined, responsive approach and familiarity with the LU environment, processes and key people is a major asset in finding solutions to problems encountered, and delivering works quickly and to a high standard.

 

SRC’s collaborative approach to Project Management enabled the client to gain a high level of confidence in the designs produced. This contributed to the project being nominated as a finalist at the annual Association of Project Management awards. The project was also voted the winner of the LU Platinum project of the year.

 

Earl's Court Station

LU's Senior Commerical Manager

“Co-operation between all parties enabled the project to be delivered well below budget despite the significant design challenges that the project team were confronted with. The budget savings will benefit LU’s future investment plans during the current difficult financial climate”.

EQUIPMENT ROOM DEVELOPMENT & DESIGN

SRC was commissioned directly by LU to develop designs to convert existing rooms into new Signal Equipment Rooms at Aldgate, Baker Street, Hammersmith, Harrow-on-the-Hill, High Street Kensington, Mansion House, Whitechapel and Marlborough Road. This project was to enable signalling equipment to be installed in support of the new Automatic Train Control system on LU’s SSR lines.

 

These were multidisciplinary designs carried out within fixed space constraints, each with separate challenges. Significant difficulties were encountered, and overcome, such as differing space requirements and restrictions, entry and egress requirements, structural strength of floors, co-located assets and lighting levels.

SRC was able to work very closely and constructively with the LU Project Team to access and assess information, and to develop and agree solutions quickly where challenges were identified. LU benefitted from dealing directly with an experienced design team that took full responsibility for all aspects of design and delivered these in a coordinated and efficient way, fully adhering to the agreed delivery programme.

 

LU Signalling Equipment Rooms

Peter Farnell, Design Delivery Manager at SRC

“This commission has developed SRC’s goal of working directly with LU and building strong relationships within the organisation. We believe SRC has demonstrated an effective approach to working collaboratively with our main client.” Paul Randall, Project Engineer at London Underground said “the standard of work carried out by SRC overall was of a high standard and their good relationship with the team at LU ensured problems were quickly resolved allowing progress to continue smoothly.”

 

The Stepney Green fire-rated enclosure commission was a multidisciplinary project involving civil, electrical, mechanical and structural engineering capability. The Fire, Security and Communications requirements were derived through careful analysis of British Standards and London Underground Standards and close collaboration with the client’s engineering and operational stakeholders.

 

The scope was to design a one-hour fire rated enclosure around existing operational, safety critical systems, including signalling equipment, within tight space constraints at Stepney Green Station, meeting LU-mandated standards of fire resistance integrity and insulation to the structure.

Working within a rigorous assurance regime, SRC delivered design and compliance documentation to a high standard, which allowed construction to proceed to schedule.

SRC also took on additional works after designs had been agreed, to enhance the ventilation and lighting arrangements within the enclosure. SRC met the challenge and incorporated changes into the designs allowing construction to commence at short notice.

Working within a rigorous assurance regime, SRC delivered design and compliance documentation to a high standard, which allowed construction to proceed to schedule.

The delivery of this commission underlined SRC’s capability to act as a flexible and responsible ‘one stop shop’ for a fully integrated design procedure.

Stepney Green Equipment Room

Patrick Keegan, SRC's Engineering Director

 “SRC was chosen for this critical commission because clients can be confident that we understand the safety and engineering issues that Equipment Rooms present, and can react quickly to their needs; on time and on budget.”

STATION MODERNISATION & ASSET STABILISATION

It was SRC’s knowledge of LU’s processes that allowed them to understand PB’s requirements and deliver to tight timescales. Many assessments and documents were required almost concurrently. SRC demonstrated the essential efficiency and careful time management required. SRC developed close working relationships with the PB Design Manager and Engineers, visited the site frequently and attended weekly meetings to report on progress and to understand further requirements.

This commission was undertaken for Parsons Brinckerhoff (PB), in support of their delivery of the Kings Cross Station Modernisation Project. SRC took on the task of handling the many civil engineering design enquiries and additionally some relating to power and communications. SRC was asked to take over this function when the contractual arrangements with the previous designer became unworkable and costly.

 

John Lonergan, PB's Senior Project Engineer

“It was the spirit of close collaboration we developed that gave us the confidence to give more tasks to SRC beyond the original scope, such as developing an earthing strategy and assessing the intelligibility of the PA system against the LU standards. The commission helped both companies develop their relationship which is vital as we are partners in a number of TfL frameworks.”

Kings Cross Modernisation Project - Design Enquiries

West Brompton station was built in the 1890s, and works to stabilise the roof had to take into account the conservation of the station's historical features. The heritage issues associated with original timber planking and cast iron fittings on the façade presented major problems as little available documentation was available in LU’s engineering archives.

 

SRC‘s expertise and experience were key in determining solutions to fulfill this commission, which was delivered for KN Network Services. SRC Civil Engineers carried out and documented a series of safe load assessments to allow a 9m high x 15m wide x 19m long scaffolding structure to be erected spanning the station under the existing train-shed roof, while ensuring that the proposed stabilisation works would not impose any loads that would adversely affect the structure.

 

SRC worked closely with the scaffolding designer and the LU Civil Engineer to ensure that the safe load assessment could be completed and approved with a minimum of delay. This collaborative approach allowed all parties to clearly understand what was required in order for the project to proceed to programme.

 

The erection of the scaffolding obstructed the permanent station lights and skylights, thereby greatly reducing lighting levels on the platforms, potentially necessitating the closure of the station. SRC developed a normal and emergency lighting design to compensate for the reduced lighting levels caused by the erection of the scaffold. The design ensured that the lighting was compliant with the relevant London Underground standards for a station platform, thereby reducing the risks of slips and trips.

 

West Brompton Station – train-shed roof refurbishment

Peter Farnell, SRC's Design Delivery Manager

“SRC’s extensive knowledge of LU’s information retention systems was invaluable in that it enabled us to undertake a full review of all documents and drawings from source to the satisfaction of the London Underground Civil Engineer.”

 

TEMPORARY WORKS

As part of KN Network Services’ Asset Stabilisation contract for West Brompton, SRC was required to develop a temporary electrical design that would provide public area lighting (to replace that being lost when a large crash deck was installed below the roof, blocking the existing lights), site lighting and small power for tools. SRC worked closely with both our Client and the end user (LU) to understand the design requirements, and adapt the design rapidly when these changed at a late stage.

This commission was also critical to the overall programme, as the temporary lighting had to be installed at the same time as the crash deck. SRC developed this design such that the power supply came from two sources (DNO and LU supply) and designed the lighting circuits so that if one power source or one transformer failed, there would still be adequate light available for the station to be safely evacuated. As well as electrical design, SRC's Civil Engineers have undertaken Safe Load Assessments on the station walls and roof for this Asset Stabilisation Project. This commission demonstrated SRC’s capability to support site works in a multidisciplinary capacity.

West Brompton Temporary Electrical Supplies and Lighting

 

This large-scale project was undertaken for Balfour Beatty Management, with the objective of adapting four stations to accommodate new 7-car trains. All the works were essentially temporary works, as new permanent stations were intended to follow. The scope included the development of temporary works designs and implementation plans, in order to achieve a platform extension of 25 metres at Notting Hill Gate, Bayswater, Paddington and Baker Street stations. During this commission the SRC team identified, function-tested and traced the routes of all in-tunnel services affected by the platform extensions. They surveyed all end of platform assets, track circuits, signalling equipment and Permanent Way assets which would be affected by the platform extension works, including full identification of all assets and systems (including functions and associated cable routing).

 

A number of specialist rooms at Baker Street, Paddington and Bayswater were involved, and it was necessary to survey these in order to confirm the identity and functions of the equipment and services within. All surveyed assets were included in a major non-compliance review in accordance with applicable legislation and standards.

SRC then prepared space applications to suit temporarily relocated services and equipment, and Conceptual Design Statements for each of the sub systems identified, including: all Power Systems (LV, HV, PFI and Traction), Air mains, OPO CCTV, CONNECT cabling, Tunnel Lighting, Tunnel telephone, Signalling, SER equipment, End of platform barrier / protection equipment, and Permanent Way together with all necessary cable management supports. SRC also prepared implementation and migration strategies for each of the assets (from permanent, to temporary, to permanent conditions).

Seven Car Project (Major Stations)

Earls Court Heritage Features Reinstatement

As part of SRC’s scope to provide new foundations for the re-instatement of heritage platform furniture which had been removed during the modernisation works, SRC had to design free-standing hoardings around each location in the middle of busy island platforms at this major interchange station.

 

The particular challenge of this commission was the location of the hoardings and the fact that no permanent structures were available to provide external stability to the temporary structures. The volume of passenger traffic on the platform, and the fact that there was track on both sides, meant that the hoardings and the scaffold structures that supported them had to be designed to resist a potentially high level of crowd loading.

 

SRC developed bespoke hoarding designs for each instance of platform furniture, backed by scaffolding structure and fixed to the platform. SRC also arranged for Cat 3 checks to be carried out for each design, and oversaw the installations to ensure that passenger and site safety were fully protected.

 

POWER ENGINEERING

SRC has undertaken an extensive study into the resilience of LU’s existing power systems in order to determine the causes of a number of single points of failure which occurred on the Jubilee Line. This focussed on a study of the resilience of the power supply in all Metronet Service Control Centres.

 

SRC organised and managed a series of workshops with key personnel from LU to determine the root causes of the problem. This required ensuring that the correct members of staff were in attendance, and that the right questions were asked to enable the time to be used as effectively as possible. The approach of getting all contributors and stakeholders together to discuss the issues collectively resulted in a comprehensive and cost efficient output. SRC produced a report listing recommendations for minimising the occurrence of Single Point Failures in the future.

London Underground has adopted these reports as examples of best practice within LU for deciding on future strategies for essential power supplies.

Jubilee Line Single Points of Failure study

 

SRC produced designs for LU for a series of TISs to allow certain sections of track to be isolated from traction current. This involved the design of power and feeding arrangements including Cable Management Systems and live rail connections. SRC also designed the civil elements of the work and managed the track clearance and space application processes for the new installations.

Interfacing new switch technology and infrastructure with existing older signalling systems required careful consideration and extensive liaison with third parties. Working within confined spaces, heavily congested with other infrastructure was also a challenge, particularly due to the fact that the new track isolation switches were larger than the ones to be replaced. Also of key importance when defining the new cable routes were electromagnetic compatibility and the effect on existing signalling equipment.

Track Isolation Switches (TIS) Design and Assurance

Significant modifications were required to be made to the existing power systems when extending the existing platforms at Paddington, Baker Street, Bayswater and Notting Hill Gate stations to accommodate the longer 7-car rolling stock.

 

SRC specified, designed and planned these extensive modifications: the 22kV and 11kV System and Cabling arrangements, remodelling of the DC Traction arrangements for the relocation of current gaps, the installation of new traction switching arrangements and the Sub Station Pilot Control Cabling. Alterations to both the Traction Earth Detection (TED) System and the Tunnel Telephone (TT) System were also to be made.

Challenges with this project involved significant safety critical aspects and extensive modifications and moving of existing cable routes requiring the third party stakeholder approval.

Seven Car Project (Major Stations)

SERVICE CONTROL CENTRES (SCC)

Victoria Line SCC

An SRC team of Project Managers and Engineers carried out the specification, installation, testing and commissioning works for a new Victoria Line Service Control Centre, including the control systems at Northumberland Park Depot.

SRC was involved from the start of the project, so was able to get agreement of the scope of works established with all parties early in the design process. This collaborative approach enabled all parties to understand fully all the works involved. This led to cost savings and a high quality finished product.

SRC managed the delivery of the build and specification, and installation of new control systems integrating with the existing ones

 

LU's Senior Project Manager

”A new SCC can be a daunting task but SRC’s knowledge and experience allowed us to save money and come up with an excellent end product.”

 

SCC Power / Systems Integrity Reports

Following a number of single point failures on the Jubilee Line, SRC developed and delivered a series of multidisciplinary workshops to gather knowledge and expertise on the issues around systems integrity within SCCs. and submitted a set of reports detailing the susceptibility of critical systems to the problem.

It was a challenge to extract, integrate and document all the available relevant information for each Service Control Centre. Twenty people attended each daylong workshop, which had to be planned and managed carefully to meet their aims as staff were not easily spared from their day-to-day duties.

It was the good reputation that the Principal SRC Engineer for the project had within LU engineering circles that ensured each workshop was well-attended and constructive. The successful approach of getting all contributors and stakeholders to discuss the issues together resulted in a more comprehensive and cost-efficient set of final reports.

The SRC set of reports have been used in deciding future strategy for essential power supplies.

LU's Senior Principal Power Engineer

“These reports are now being used as examples of best practice in London Underground.”

CONNECT Dispatchers

SRC were commissioned to carry out survey and design work giving guidance on design optimisation and co-ordination for CONNECT PFI (the TfL communications system) to be installed and integrated into the systems of all Station Control Rooms and Service Control Centres. Technical challenges of space constraints within operational rooms, and the integration issues between new and old equipment, were overcome through SRC’s strong domain knowledge and the development of a case for an alternative approach through identification of suitable new technology. This created a significant cost saving.

SRC led an “Optioneering” initiative that included workshops focussing on solving the problems being encountered in the integration of Connect equipment into SCCs.

Stefano Saccomani, LU’s Project Leader

”SRC demonstrated their strengths as a flexible and creative designer. They identified all potential solutions through their innovative approach.”

SRC has specialist knowledge of Wood Lane SCC systems and equipment, as the company has engineers within the team who were responsible for testing and commissioning them and had previous operational experience in the role of LU Duty Engineers.

Consequently SRC were selected to develop and deliver specialist communications systems training for the Line Duty Engineers for the Central Line. The result was a 100% pass rate, with all delegates earning the relevant licences.

Wood Lane SCC Engineer Training

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