We're delighted to announce that MHB Consultants has two new directors:
Fergus Aitchison has been promoted to Director, effective January 2018, in recognition of his contribution to MHB since joining in January 2015. He currently leads a team of eight engineers who specialise in the design of bridge replacement and refurbishment projects in the rail and roads sectors.
Duncan Sooman has joined MHB as a Non-Executive Director in January 2018. Duncan is a career railway civil engineer with extensive experience of all aspects of railway track and civil engineering having held very senior positions in British Rail, Railtrack and Network Rail. He was Head of Engineering for Network Rail, Infrastructure Projects, Scotland & NE until 2014 when he began working as an Independent Consultant to the Rail Industry. He brings a wealth of knowledge and experience to MHB which will be invaluable as we continue to expand.
MHB Consultants has again maintained a five star grading following our annual
RISQS audit. That we have reaffirmed the five star status is a real testament to the on-going dedication, passion and hard work of our team. Well done all!
SHEET PILE RETENTION STRUCTURES ON A90 TRUNK ROAD, ABERDEEN WESTERN PERIPHERAL ROUTE/ BALMEDIE –TIPPERTY
MHB Consultants recently carried out a temporary works design associated with a replacement bridge carrying the A90 trunk road over the B979 Netherley Road, as part of the Aberdeen Western Peripheral Route/Balmedie-Tipperty (AWPR/B-T) project.
The existing reinforced concrete structure was to be replaced on a similar footprint, but with a wider span over the Netherley Road below to help form the new Stonehaven Junction. Another key project requirement was for the A90 to remain open to traffic in both directions throughout the works. To facilitate this, an anchored sheet pile retention structure was required to allow the existing bridge to be cut longitudinally, demolished sequentially and rebuilt in two halves. The retained height was up to 9.8m and the traffic loadings imposed resulted in a requirement to use heavy Larssen 605 steel sheet piles with three rows of waling beams with ground anchors.
Close liaison was required with the New Works Contractor, AWPR Construction Joint Venture, and our client, Albion Drilling, to ensure that the construction sequence was carefully thought through, and stability was maintained at each stage of the works.
The Phase 1 works (southbound closure) required 515kN working load ground anchors (type 75/53 by Ischebeck Titian) angled downwards at 45 degrees and terminated 4m into the sedimentary bedrock. For the Phase 2 works (northbound closure), the sheet pile wall was restrained by the use of an anchor wall embedded in compacted granular fill forming the new road embankment.
The sheet piling works were installed by LB Foundations with Albion Drilling carrying out the drilling and anchoring works. The temporary works were completed in October 2017.
The AWPR/B-T project is being delivered by Transport Scotland in partnership with Aberdeen City Council and Aberdeenshire Council. Aberdeen Roads Limited was awarded the contract to build the AWPR/B-T in December 2014 and has appointed the AWPR Construction Joint Venture, comprising Balfour Beatty, Carillion and Galliford Try, as the New Works Contractor to build the 58km road.
When complete, the AWPR/B-T will help reduce congestion, cut journey times, improve safety and lower pollution in Aberdeen City Centre. It will also enable local authorities to develop public transport solutions.
Photos at key stages of the construction are shown below (courtesy of AWPR Construction Joint Venture)
Sandy Sutherland has joined MHB as a Senior CAD Technician on 30 October 2017. He brings a wealth of design and construction experience gained most recently at Amey and White Young Green. He has extensive experience in the rail sector in the last 20 years, notably on steel bridges, as well as having worked in the buildings sector earlier in his career. Sandy will be working in our bridges department.
MHB Consultants recently completed a CAT III checking works as part of the Lincoln Eastern Bypass works for BAM Nuttall. The existing embankment on the SPD2 line near Washingborough Road (Lincoln) is to be replaced with a 39m span bridge. The proposed bridge was to be constructed offline and slid into place on skid rails.
The checking work included the following;
The existing embankment was to be extended on both sides to accommodate the piling platforms required to install the permanent works piles. This included slope stability analysis, checking of the construction and removal stages, settlement calculations and working platform designs for various items of plant at various stages of construction and demolition.
The offline bridge construction required the construction of a working platform and temporary piles with concrete pile caps. A check was carried out on these and the skid rails and shoes used to slide the bridge into place. The bridge slide was modelled using Strand 7 Finite Element Analysis.
We also carried out the design of four temporary platforms outside the extent of the works to enable monitoring works to be carried out. These comprised granular fill platforms retained by sheet piles with access stairs to two of the platforms.
MHB completed the checking works in early 2017. The bridge slide was successfully completed in late October 2017.
Watch this great footage here: https://vimeo.com/241144794/48cecbac8d
Video courtesy of Bam Nuttall
Derrick Chan has joined in September 2017 for a six month secondment from Network Rail. Derrick is a graduate civil engineer with a year's experience since completing his studies at the University of Aberdeen. Derrick will be working in our bridges and structures department.
MHB have a position for a chartered or near chartered Geotechnical Engineer.
The ideal candidate will have a minimum of 3 years design experience in civil/ geotechnical engineering consultancy and be looking for an opportunity for career progression. The job will require a motivated individual who is technically capable as well as a good communicator.
The individual will be a geotechnical engineer or engineering geologist with design experience in some or all of the following: slope stability, foundation design, pile design, soil nailing, ground anchors, retaining wall design and report writing as well as a knowledge of the relevant design standards. Rail experience would be an advantage. A good knowledge of Autocad is required as well as general design and MS Office software.
It’s a Client facing role so the job will appeal to good communicator who likes working with people.
Degree qualified in civil engineering or a first degree in geology plus MSc in geotechnical engineering.
Clean driving licence
Annual discretionary bonus
21 days annual leave + 8 public holidays
Company Pension Scheme
Why Consider This Role
Company has a “can do” attitude.
A chance to prove yourself at a growing company.
Lots of opportunities to gain business experience, dealing with the full cycle of business activities from winning work, carrying it out, as well as developing and running a design team.
Send CV and covering letter to firstname.lastname@example.org
James Chang has started as a Graduate Engineer on 4 September 2017, working in our Civils and Geotechnical Department. James has an MEng in Civil Engineering from the University of Glasgow having graduated in 2017. He has gained industrial experience during his studies with Sir Robert McAlpine and McLaughlin & Harvey.
As part of Network Rail's plan to introduce electric services on the Edinburgh-Glasgow Central via Shotts Line, BAM Nuttall were appointed to carry out route clearance works. This involves works to bridges to ensure that the power cables can run under structures on the line. MHB Consultants have designed temporary works associated with a number of these structures over the last year. An example is the removal and replacement of a road bridge carrying the A71 over the railway in West Calder. The temporary works designs carried out by MHB included:
• Working Platforms for grouting mine workings - Working platforms were required at the four corners of the bridge to carry out the grouting of the historic mine workings. The existing embankment required to be extended to provide a platform for the drilling rigs to reach the extents of the grouting works. The design involved slope stability analysis and settlement calculations.
• Temporary Footbridge Foundations – To maintain access for pedestrians and a service route, a temporary bridge was designed by Jansons. MHB designed the foundations including bank seats and tower foundations.
• Crane Outrigger Foundations for various stages of the works.
• Piling Platforms.
• Abutment Stability Analysis during various stages of the demolition.
• Temporary excavation support adjacent to the track to enable the construction of the permanent bridge foundations.
• Temporary stability of proposed precast units during installation.
• Platform Hoarding throughout the works.
• Precast concrete lifting anchor checks for the proposed bridge units.
The works were successfully completed in early 2017 by main contractor, BAM Nuttall.
photos courtesy of BAM Nuttall
MHB were appointed by QTS in January 2017 to carry out drainage and earthworks design on a railway cutting at Castlecary near Cumbernauld. The line carries the Edinburgh to Glasgow Main Line through a 6m deep cutting which is at risk of soil slippage in periods of wet weather. The site was classed as an Adverse Weather Site which requires frequent inspections and has in place automatic slope monitoring sensors along the track to alert Network Rail of any landslides. The project involved outline and detailed design work to implement a scheme which stabilised the vulnerable parts of the slope and removed the site from the Adverse Weather register. Following site investigation works, scoped by MHB, a scheme was developed which included regrading unstable areas with rockfill and installation of drainage systems at the top of the slope to intercept surface water flow prior to it reaching the railway cutting. Due to the presence of the Antonine Wall which borders the site, as well as absence of suitable outfall locations, it was not possible to install crest drainage throughout. A rockfill blanket was used where required to ensure that the regraded slope remained stable in the absence of a conventional cut off drain. The works were successfully completed by QTS.
MHB services included topographical surveys, slope inspections, outline and detailed design, and technical support during construction.
photos courtesy of QTS