A thorough understanding of ground conditions is essential to all successful development projects. Our experienced Ground Engineering team can offer a full range of investigation, assessment and design services for all stages and types of development, in order to de-risk projects and unlock development potential.
Jubb were appointed to provide specialist land remediation advice along with detailed civil and structural engineering input for a new 250 unit residential site in Sittingbourne. Historically, parts of the site were a former gas works with the remainder forming a precast yard for Milton Pipe. Consequently, the land was underlain by significant ground contamination and required extensive remediation of in situ soils and ground water plus residual risk management measures to dwellings and garden spaces. The engineering challenges of the scheme were complex, and Jubb was instrumental in developing cost effective solutions to the constraints posed by contamination, difficult topography, boundary constraints and spatial constraints.
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Jubb are supporting Persimmon with the development of the 141Ha site on the former Grove Airfield. Jubb are providing support on the main infrastructure and SUDS drainage solutions, global earthworks strategy and providing parcel support for the detailed civil engineering design.
The primary infrastructure for highways has been designed in detail and is being taken through technical approval with Oxfordshire County Council, with the SUDS drainage systems being offered for approval through the Vale of White Horse Lead Local Flood Authority through the planning process. Surface and Foul drainage is being offered under Section 104 for adoption by Thames Water and Jubb are liaising closely with Thames on a bespoke agreement to provide a Strategic Sewer and Pumping Station for the area of Grove as a whole, which will be situated within the development.
The SUDS strategy allows for the phased approach to the formation of swales and ponds, whilst maintaining flows from the remaining undeveloped areas during the build. Multiple control features have been developed in order to maximise the storage within the swales and ponds in order to achieve a 32% reduction in the greenfield discharge rates, to improve downstream flooding.
As parcels are brought forward for development, the drainage and earthworks strategies are further refined to ensure the most efficient solutions are identified.
Jubb supported Gallagher Estates with this 66Ha greenfield site for ‘disposal for residential’ development. Jubb worked alongside Gallagher Estates to establish site wide strategies for earthworks, drainage and infrastructure providing holistic models to inform viability and potential phasing.
The primary infrastructure for highways and drainage was designed in detail and taken through to technical approval with Warwickshire County Council and Severn Trent Water. The highway infrastructure included a new primary estate road and bus route through the site with several new junctions to the existing highway network as well as off-site alterations.
The surface water drainage strategy for the site was designed to provide flexibility in the phasing of the site development. Attenuation ponds were designed to meet the local council’s requirements for adoption and to make use of the existing fishing ponds while tying in with the proposed landscape strategy.
This 17-storey reinforced concrete building is located within the London Borough of Brent close to Wembley stadium. The building will accommodate 283 high quality student bedrooms with active commercial units at the ground floor.
The structural arrangement was carefully considered to avoid a 10m deep, 1.2 diameter foul truck sewer crossing the site. A detailed three-dimensional survey was undertaken to accurately map the sewers location. Jubb then undertook a detailed ground engineering analysis of the proposed development to ensure the optimum piled foundation solution was adopted and no load was transferred to the sewer.
The Butts Bridge scheme represents a complex programme of highway improvements required to facilitate the delivery of the South Alton Masterplan. The scheme includes the demolition of the existing brick arch railway bridge over the A339 at Alton and replacement with a new 32m skew span weathering steel structure. The bridge replacement delivers the space required to allow the delivery of a major new junction to create capacity for the new residential development proposed. Additional highway links, footway upgrades and development access junctions were also required.
Jubb have provided specialist transport planning advice to promote the South Alton Masterplan through planning and have delivered the full engineering design of the enabling infrastructure and bridge works. The bridge work involved close liaison with Mid Hants Railway Trust to future proof the envisaged expansion of railway services through widening of the structure for a second line and the delivery of strengthened embankments to meet modern day design standards.
As lead consultant, Jubb also directed the construction procurement providing all design, specification and contract inputs and managed the delivery of the project as Contract Administrator.
Jubb were appointed by CAN Geotechnical to undertake an inspection of an historic rail tunnel and steep Limestone rock cuttings formed through the Mendip Hills Area of Outstanding Natural Beauty (ANOB) in North Somerset.
Shute Shelve tunnel is used as a bridleway and forms part of the national cycle route. Kier Group are working for Bristol Water, to install a new water main between Bristol and Cheddar and Shute Shelve tunnel was selected as the optimum route as it avoids damage to the Mendip Limestone escarpment.
Jubb’s design includes a rock fall containment meshing and rock bolt system to a 70m length section of unlined the tunnel crown, dentition work to the North tunnel portal area and a rock fall containment barrier to the South tunnel portal.
Rock scaling to the South approach rock cuttings was specified to reduce the risk of rock falls, in-line with the North Somerset Council’s (NSCC) asset management strategy.
Conservation vegetation management was specified to the cuttings, working in collaboration with NSCC’s open spaces team, including coppicing of broadleaf saplings.
Jubb’s expert geo-hazard capability includes the investigation, assessment and design of rock and soil slope stabilisation and protection measures.
The development comprises a 5 ha. Retail Distribution Warehouse and surrounding site extending to 11 ha.
The Avonmouth area has deep, soft compressible alluvial soils and a piled warehouse slab and superstructure were required. More lightly loaded external service yard areas were improved using controlled modulus columns.
Jubb provided specialist ground engineering support from the pre-acquisition cost planning and due-diligence stage, through to the design and specification of a site investigation, interpretation of ground conditions, multi-criteria foundation options development and preliminary design and the preparation of specifications for ground improvement, earthworks and piling. Construction phase technical support was provided acting as the Clients Geotechnical Advisor.
Jubb have been appointed by Linden Homes to design a soil nail reinforcing cutting, to open up the development platform of a housing development in the centre of Radstock, Somerset.
Existing site investigations had revealed historic slope instability and a number of springs that required a careful, staged design approach.
Jubb used specialist software to carry out slope stability analysis at each stage of the proposed construction. Linden’s specialist contractor worked closely with Jubb during the detailed design stage and this resulted in a very high standard of workmanship.
The existing hill slope angle of around 20 degrees was cut into at a grade of 1:1.5 which optimised the requirements of a green permanent facing and development footprint. The cutting face was finished with a seeded topsoil placed into a cellular geogrid attached to high-tensile ‘Tecco’ mesh facing manufactured by Geobrugg of Switzerland.
Counterfort drains were specified below face drains and the cellular geogrid used to provide a stable counterfort style drainage blanket.
The end result was a high-quality cutting profile with the soil nails and meshing system hidden from sight.
Jubb are appointed to undertake annual inspections of the iconic White Cliffs of Dover, on behalf of the Dover Port Authority.
Jubb’s remit also includes inspection of a series of tunnels excavated into the cliffs, that form part of the Port’s estate portfolio.
Following the first cliff inspection undertaken in 2016, Jubb’s Ground Engineering Solutions team developed a bespoke Rock Fall Hazard Index (RFHI) tool, to provide the Port Authority with a clear risk based, multi-criteria assessment of rock fall hazard.
Dover Port is a nationally important transport hub that sees some of the highest vehicle movements in the UK. Protecting infrastructure and the public from rock fall hazards is fundamentally important to the safe operation of the Port.
Jubb have been appointment to carry out advanced rock fall analysis and are using specialist software to undertake this work, which will provide a higher level of accuracy in assessing risk.
Jubb’s expert geo-hazard capability includes the investigation, assessment and design of risk and soil slop stabilisation and protection measures.
Detailed assessment of ground engineering issues such as mine workings, remediation and cut/fill along with drainage strategy and FRA plus off-site highway works and abnormal cost planning.
Forming part of the redevelopment of the support site for the former Magnox Nuclear facility at Berkeley, Gloucestershire. The new University Technical College (UTC) is a 5,500m², three-storey teaching block, single-storey engineering workshop, challenge arena and cyber café for South Gloucester and Stroud College (SGS).
A fully braced three-storey steel frame with pre-cast unit flooring forms the central curved teaching block. At each end the engineering block and challenge arena are mono-pitched portal frames and the cyber café with large glulam roof beams greet the students via the main entrance.
Jubb provided geotechnical, civil and structural support for the project. This was a challenging site with constraints due to its close proximity to the decommissioning of the former Magnox nuclear facility and the refurbishment of, and link to the adjacent Berkeley Green SGS Skill Centre.
Town Centre redevelopment of industrial brownfield land allocated in the Bath and North East Somerset Local Plan for residential and mixed use purposes. The scheme was comprised of new highways and public realm, residential units and a number of mixed use buildings, set within the existing town centre.
The main features of the proposals were a strengthened town centre core, focused upon the existing public realm and historic core of The Street, the southern side of Wells Road, Fortescue Road and the Frome Road with a mix of uses including retail, commercial and residential uses together with associated works to improve the public realm.
The residential development came forward in phases with the northern end of the site being higher density and mixed use in character with a progression towards the southern end of the site of medium / low density development and a mixture of open space, residential uses that reflect the rural character of the town.
Jubb provided engineering led planning support to the wider masterplan evolution before undertaking full engineering design of the enabling infrastructure and three separate phases of residential and mixed use development totalling some 200 units.
This 104-acre mixed B-Class Business and Industrial Park is situated next to Junction 23 of the M5. With planning consent of 1.5m sq.ft of floor area, the development received support from the RDA as a strategic employment site and has been developed out on a Plot by Plot basis extending the infrastructure to suit to minimise the developer’s upfront costs. The site is now almost complete and includes office units, distribution centres, industrial building, a hotel and conference centre.
Soft alluvium and peat to a depth of 30m, the construction of a 3km flood protection embankment, a flat, tide locked site in an area with serious surface water drainage problems next to the ecologically important SPA of the river estuary were all significant constraints that were overcome with our innovative Engineering design solutions.
In light of the Coronavirus pandemic, our business resilience planning is now being implemented. Whilst we have not closed our offices at this time, we have empowered all staff to work remotely should they choose to do so, and our business infrastructure is fully enabled to seamlessly support the transition to this style of working. Additionally, Government advice may shortly dictate the need for us to make the closure of offices compulsory in the interests of safeguarding wider public health.
We continue to be fully operational but these measures are likely to produce a change to our working patterns.
You may therefore find that you have difficulty reaching us by our main office and direct dial landline telephone numbers but all staff can be still contacted by email, mobile numbers and Microsoft Teams.
For our formal Action Plan and Risk Assessment click COVID-19 Action Plan Risk Assessment_26 March 2020