MHB were commissioned by AMCO Giffen to carry out the detailed design for a new footbridge at Arkleston Drive in Paisley.
The original 3 span footbridge over the railway comprised steel lattice girders and a reinforced concrete deck and carries pedestrians over the Glasgow Central to Stranraer railway line. The bridge was in poor condition and following an options study it was concluded that a new structure was preferable to repairing the existing bridge.
The new bridge is a 2 span bowed Warren truss structure with a main span of 37m and a smaller secondary span of 4m. The bridge will be supported on new piled foundations throughout with some of the approach substructure being retained.
The detailed design was completed late in 2018 with construction due to be carried out in early 2019. Fabrication of the structure was by Lanarkshire Welding, photo from their fabrication workshop included below.
MHB Consultants were contracted by AMCO Giffen, on behalf of Network Rail, to undertake the strengthening and refurbishment of Orchy Viaduct to ensure the structure would be able to achieve a load rating of RA5 @ 45mph and RA7 @ 10mph and remain maintenance free for the next 25 years. Orchy Viaduct is a 140m long, 7 span, half-through, metallic underbridge forming part of the Crianlarich to Oban line and carries a bi-direction track over the outflow of the Rive Orchy into Loch Awe.
The works undertaken on the project by MHB Consultants included:
These tasks were completed by September 2018 with the project scheduled for completion on site in January 2019. To date, a disruptive possession of the railway has taken place with successful installation of the new timber deck achieved.
MHB Consultants offered all the services required to deliver the work from initial site investigations to final delivery of the design. We were able to carry out all inspection works, topographical surveys, calculations and designs and work as a team to ensure all processes were carried out to the benefit of the project.
During the initial reviews a computer model was developed of a single span only that cut down on the analysis and model development time which minimised the time taken for the assessment. Additionally, MHB Consultants undertook a sophisticated non-linear buckling analysis on the top chord of the Main Girder Truss to better capture the effects of the U-frames, large non-standard intermediate stiffeners and cross girders on the top chord behaviour than the conservative approach in BS5400-3:2000. This innovative approach ensured that the element capacity was maximised and led to minimisation of the strengthening scheme required.
MHB Consultants undertook further detailed analysis to compression and tension diagonals of the main girders to confirm the required strengthening extents by undertaking a buckling analysis. This advanced analysis removed the requirement to strengthen 84 sets of flat plates saving significant sums of money.
MHB Consultants also increased the sustainability of the project by minimising the volume of timber required for the installation of the new timber deck. This was achieved by refining the required extents of the timber without reducing the functionality of the bridge. This change meant that 5% less timber (approx. 6 tonnes) of timber was saved.
Below photos are courtesy of our client AMCO Giffen.
Part of the Stirling, Dunblane & Alloa (SDA) electrification scheme involves installation of overhead line equipment (OLE) inside Kippenross Tunnel. The 554m long tunnel, which was constructed in 1848, is located just south of Dunblane Station.
To allow electrification of the tunnel, steelwork support brackets are to be installed at a number of locations along the crown of the tunnel arch, which will carry the contact wire.
Services provided by MHB included design of the anchors which will attach the OLE support brackets to the tunnel lining and inspections of the brickwork and sandstone masonry of the tunnel lining prior to installation of the OLE components.
For further updates on the SDA project see the latest news feature from Rail Business Daily.
The photographs below were taken during a recent site visit carried out by MHB Consultants on the first day of a 9-day blockade during which wiring is installed.
Client - PBH Rail/Costain
As part of the Sighthill development works in Glasgow, a new road bridge was constructed by AMCO off Keppochhill Drive and over the Railway line EGM1. This bridge was positioned at the same location of the old footbridge which had been previously demolished as part of Edinburgh Glasgow Railway Improvement Programme (EGIP).
This bridge will be used as one of the accesses into the £250m regeneration area in Sighthill.
MHB Consultants designed the earthwork tie-ins at the four corners. This consists of Maccaferri terramesh walls sitting on soil slopes stabilised via a combination of soil nailing and flexible facing.
Due to the limited space available near the cemetery wall corner, MHB Consultants also designed an anchored sheetpile wall to provide the transition into the original ground profile.
Our solution avoided the need to construct reinforced concrete wingwalls and is more environmentally friendly and cost effective.
Construction of the bridge and tie-ins has recently been completed with some photographs of the structure and works below.
Photos courtesy of our client AMCOGiffen
We are recruiting for the positions listed below, please click the image to be taken to our careers section to read the job specifications. Any questions please get in contact on 0141 248 5154 or email firstname.lastname@example.org.
A big welcome to our newest member of the team, Kerry Becker.
Kerry is a recent graduate from Glasgow University graduating with a first-class honours degree in Civil Engineering (MEng), she also has a Diploma in Architectural Studies from the University of Strathclyde. During her final year of study, Kerry won the 2018 William Johnston Prize for her Geotechnical studies.
She is a Graduate Member of ICE and IStructE.
Initially Kerry will be working in the Civil & Geotechnical Design department, and in time she will also support the Bridges Design team too! Now that's what you call multi-tasking!
We all look forward to working with her.
We recently completed our 1000th job since MHB was founded in 2007. It’s been a bit of a journey – starting from a one man band freelancing in 2007, to 3 staff in our first office in a shared business centre, to 24 staff today in our St Enoch Square Glasgow office.
The jobs have ranged from fees of £100 to over £0.5 million with everything in between. We have expertise in temporary works, permanent works, bridges, tunnels, soil stabilisation, drainage schemes, railway platforms and lots more.
Thanks to all our past and current clients and we look forward to continued success, Cheers!
Friday celebrations (L-R): Alistair Gray, Gleb Borshchyev, George Marjane, Chris Miller, Graeme Edwards, Sean McDade, Craig McLeod, Damien Moore, Gillian Pettigrew, Mike Lauder, Amy Buchanan, Hendrie Barbour, Noosha Madjlessi, Michael Hynan.
As part of the Stirling/Dunblane/Alloa (SDA) electrification works, the existing footbridge at Stirling station between platforms 6 and 9 (which is listed) is to be removed and then reinstated.
The footbridge is to be removed and refurbished and will be returned to site in approximately 1 year.
When the footbridge is removed, temporary propping is required to the station building beams which are currently supported from the footbridge superstructure.
MHB designed the temporary propping to the station building façade, temporary footbridge foundations, temporary hoarding and piling platform to facilitate the removal of the footbridge and the installation of the permanent works.
The footbridge was removed on 2 September 2018.
The remaining works are ongoing but here are some pictures from the site to show the footbridge being lifted out for its makeover!
Photos and video are taken by our Senior Engineer, Gillian Pettigrew.
An on-site video in action!
Over the past few weeks two new members of staff have joined us at MHB Consultants. These fresh faces are here to bolster our team and support our continued growth.
Chris Miller has just completed his honours degree in Civil Engineering at the University of Strathclyde. During his time at University he worked part time as a land surveyor, and as a student engineer in the construction industry during his summer breaks.
Noosha Madjlessi has recently finished her PhD in Civil Engineering at Heriot Watt University. She studied her MSc in Civil Engineering Structures at City University London and her BEng (Hons) at Cardiff University. She has 2 years post graduate experience in a multi-disciplinary firm of consulting engineers whilst working in Iran.
We welcome another new starter at MHB Consultants.
Sean is our newest bridge engineer, he will be working alongside the bridges design team supporting them on a variety of new contracts.
He graduated from the University of Glasgow in 2014 with a first class degree in Civil Engineering. He has 4 years of industry experience with the most recent being a role with AECOM. He comes to MHB with extensive technical knowledge in the form of production assessment and designs for bridges and analysis through the production of linear and non-linear models of existing structures.
We look forward to supporting Sean’s growth and development within the firm.
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