Case Studies
Computer Associates HQ, Datchet Park
External civils works involved surface water attenuation to balance the storm water run off volume from the circa 800-space car park, prior to discharging to the local watercourses as well as new road bridges, pipe bridges and environmentally friendly culverts. Considerable cost savings were achieved through soil remediation over traditional methods of dealing with poor quality surface soils beneath the vast car park areas.
Laban Dance Centre, Deptford
We were employed to deliver the sub-structure and structural frame of this impressive award winning dance centre. The insitu RC sloping roof is of particular note, and presented some logistical challenges to its construction. This landmark building will serve to demonstrate the Centre's enduring local, national and international presence, and it has been identified as the focal point for the social and physical regeneration of Deptford and the surrounding area. It will provide state-of-the art facilities for the training and professional development of dance artists and scholars, as well as offering associated training and educational opportunities to organisations and individuals residing in the area.
Darwin Court, Walworth, London
The development provides 76 'Lifetime' homes above communal facilities that include a swimming pool, restaurant, IT training areas and healthcare facilities. This innovative project is designed to be a prototype community for 'The Third Age' (the over 50's). We constructed the Substructure, Reinforced Concrete frame and External works on this important social and forward thinking project.
Pfizer, New European HQ, Walton Oaks, Surrey
Our External Works package for this impressive International Head Quarters included materials of a particularly high quality. Great care was taken and attention to detail was required to deliver this package. The building is of particularly high quality of finishes. We were pleased to have been a part of the project team.
UCI Cinema Greenwich Peninsular
The project involved the use of state of the art 3 dimensional computer modelling to produce a superstructure design solution. In excess of 1300 tonnes of framing were erected to produce the building's skeleton in as little as 12 weeks. The 24 metre high building provides a strong, architectural addition to the other 21st century developments completed on the Peninsula. Four restaurants totalling over 1100m2 of space are also being developed at the front of the complex, which features a central courtyard area.
88 Wood Street London EC1
The 18-storey building has six externally expressed cores, two of which are fully glazed. The steel-framed cores gain lateral stability from the post-tensioned concrete frame. The stair design had to accommodate three different floor-to-floor heights.
Arundel Great Court, Central London
Improvements to this 60's office building provided an extra 5000 m2 of office space. Our package was the substructure construction for the extensions. The new building had to be supported above 2 levels of existing underground car parking. The whole building was hung off six, 600mm dia. tubular steel columns, which rise up through the building and project above the roofline.
Brentford Lock , Brentford
We were employed to carry out the enabling works and cofferdam sheet piling. Access road and construction of deep basement including bulk excavation and raft slab construction. Following this was the construction of the Insitu RC structures, transfer slab and superstructure. Externally we carried out the construction of the new river wall including the piling and finishes to this section and bridge foundations and abutments. We were also involved in the remediation and formation of an ecology flood plain
Charter Quay, Kingston upon Thames
Sheet Piling to basement, Bulk dig to basement, Basement slab, retaining walls, columns, stairs base to grd. Entrance Ramp, Grd floor slab 1st floor slab, toppings, bridge over creek, ext works & stone finishes
Access Self Storage, Merton Road, Wandsworth
Design & Build of 14 metre deep Basement including Temporary Works, Bulk Excavation, Waterproof Design, Lift Cores and Concrete Works. O'Keefe Construction (Greenwich) Limited worked as Principal Contractor
Davies Street, Mayfair, London W1.
Construction of a six-storey reinforced concrete frame including a tanked reinforced concrete basement. Our package included a considerable Temporary Works Interface and logistical challenges of working in a City Centre Location
Big Yellow Storage, Kennington Lane, Vauxhall
During the project at Big Yellow Storage, Kennington Lane we excavated a 2 storey basement and undertook all the associated temporary works. The basement works comprised of capping beams to secant piling walls and a single sided perimeter wall including basement salb and underslab drainage. The works also included a suspended ground floor slab.
7-10 Old Bailey
Reconstruction of an existing basement adjacent to the Courts of Law. Working in a very restrictive environment, we undertook the installation of 750mm diameter rotary bored piles through an identified scour hollow. Construction of pile caps and core caps to receive a pre-cast concrete core and steel frame (by others). Temporary works in conjunction with retaining the existing road and vaults following demolition of the ground slab. Concrete to metal decking.
Merton PFI Schools, Merton, Surrey
The schools involved in the project are Bishopsford, Mitcham Vale, Raynes Park, Ricards Lodge, Rutlish and Tamworth Manor. The project combined new build and extensions of various buildings whilst the schools were operational. We contracted to deliver all Groundwork, RC Frames and External Works Packages. We were able to concurrently deliver the packages, and simultaneously provide safe access & continuous use logistics for Staff & Pupils at all times.
23 Savile Row
Awarded in two phases this project required O'Keefe to undertake the installation of rotary bored secant piled wall to the perimeter of the site through the existing basement & lower basement slabs through an opening formed by drilling and bursting methods. Design and installation of temporary works to retain the perimeter structures and roads via plunge column steel sunk into the male piles and stub columns fixed to perimeter wailings. Construction of a capping beam, followed by bulk excavation of basement to new levels. Construction of substructure foundations and cast iron drainage installation. Steel frame (by others), Concrete to metal deck.
Beckton Riverside
Groundworks for industrial warehouse/business park development which included the construction of some 29,000m2 of air entrained 200mm thick HGV loading service yard slabs. Installation of all joints and associated surface water drainage including Gatic linear drainage and petrol interceptors. At its peak our labour resource reached 5 concreting gangs.
Stratford City Developments
Probing of pile position and formulating a survey of obstructions within ground to a depth exceeding 7meters through pre-limed and cemented land raise derived from Stratford box construction. Excavation and removal of obstructions under instruction and crushing to 6F2 product, stockpiling for future use. Earthworks balance exercise (Cut to fill) and disposal in excess of 110m3 of excavated material. Maintaining pre-modified materials on site for future use. Formation of piling platform levels and stabilising to obtain design strengths in excess of CBR50, creating piling platform.
Swan Valley School, Southfleet Road Swanscombe, Kent
This PFI scheme which was valued at £18m and comprised a 2 Phase extension to an existing secondary school, together with the refurbishment of Phase 1 accommodation and the construction of a new Primary School Extension of an existing school. Our works consisted of the construction of the sub structures and external hard landscaping.
University of East London Docklands Campus
We carried out both the enabling works, groundworks, insitu RC & external works packages on this phase of UEL development. The enabling works comprised a bulk excavation and a stabilised platform, forming part of the permanent works and pile mat. The ground work formed a complex matrix of ground beams, wrapped in several layers of insulation and waterproofing, which is ideally suited for use in a stabilised platform. Particular attention had to be paid to environmental issues as we were working dock-side of the Royal Dock and almost under the flight path of planes out of City Airport.
DEFRA VLA, Vetinerian Laboritories, Weybridge
This was a return to the research centre in Weybridge, and we were engaged to construct the sub and super structures for the new research laboratories. The foundations were traditional pile caps and ground beams, with an element of specialist drainage. The super structure is an RC frame, to 4 storeys with a very interesting waffle slab detail at 2nd floor. Co-ordination issues were very important, owing to the high level of IT and M & E installations.
Triton Square, Euston Underpass, London.
Construction of a series new publicly accessed squares, one of which is built off an existing Podium slab. This was cut away in areas to form atria and rc constructed, granite clad folding lawns. In addition the construction of a feature white RC planter raised some 3m above the ground and supported on stainless steel needle coloumns. The paved areas are specialist waterproofing systems, over laid with specially imported Chinese granite, which has a matrix of stainless steel channels to house fibre optic lighting that projects light from the joints of the paving up and onto the glass clad buildings. The M&E, including irrigation systems are also within our scope of works. Safety was paramount as all areas were kept accessable to the public.
Sunrise Assisted Living, Purley & Banstead
We were engaged under traditional contract to deliver substructure, drainage and external works packages on these two projects in south London. Being closely situated we were able to combine resources and management. Both projects although similar in style above ground, were different in the ground, one with basements and sub structure RC. And the other a traditional ground slab.
Aviator Park Addlestone
We developed the substructure design for 101000ft2 high quality offices, in conjunction with our sister company O'Keefe Soil Remediation. We provided a complete substructure design solution in a wet and contaminated site. By using Stabilisation as a solution we were able to minimise the traffic impact locally, with a reduction of some 2-3000 traffic movements. The final design incorporated the ground slabs into out stabilised platform which doubled as pile mats and dry working platforms.
Clacton Schools PFI, Clacton-on-Sea, Essex
Work at Clacton County High & Bishops Park involved construction within the heart of the existing buildings to form a new dining and social area. This required erection of a steel frame to support the enclosing roof structure within a confined courtyard area. At the same time construction of the new gymnasium facility was carried out, which followed the demolition of the temporary sixth form block and a stair tower which occupied part of the new gymnasium footprint.
Westwood Cross Phase I, Broadstairs, Kent
We undertook several works packages including one of the most important soil stabilisation packages carried out in the region. We treated over 70,000 m2 of material often to a depth of 1m. Incorporated into the stabilised soil were extensive RC foundations and waterproof pits. This process gave considerable programme and cost advantages and made the construction of 20,000 m2 of ground slabs and over 2km of drainage much more efficient. The external works also boasts 26,000 m2 of macadam and almost 20,000 m2 of hard paving. We are particularly proud of the 15m granite compass and stainless steel sundial which is an architectural feature on this, which is one of the largest shopping centres in the area.
Institute for Cancer Research, Huntley Street, London, WC1
Our package included the basement excavation which had a considerable temporary works element as we were working over the operational basement of the existing hospital and in addition we had to support the existing Chenies Mews and underground services that was on the boundary. Cast Iron drainage was suspended through a 1400mm deep basement raft slab. The 33m high core was jumped using our stock Peri equipment and superstructures consisted of structural toppings and column encasements to the steel frame and precast floors. The site had all the usual constraints of a city centre location and traffic management
Frog Island, Marsh Way, Essex.
This new state of the art Mechanical and Biological Treatment Facility is one of the first to come on line in the UK. The facility will process up to 180,000 tonnes of municipal waste by seperating out recyclable components then shredding & drying the remaining refuse. Our package was to deliver the groundworks package of all piled foundations, beams, slabs and special concrete substructures, all carried out in poor ground with tidal groundwater conditions. The drainage design is of particular note as it contained some large diameter fusion pipework and some very precise interface with M&E contractors.
Holiday Inn Express, Brentford
We were employed to construct the Basement substructure, which consisted of Sheet piled walls lined with concrete on a piled raft foundation. We had full responsibility for the temporary works and waterproofing. This was an interesting challenge as the site was bounded on three sides by the Grand Union Canal. The 5 storey super structure concrete frame was self finished for direct decoration.
Brooklands Heritage & Training Centre, Weybridge
A truly spectacular RC Frame which has been nominated for Awards, we were shortlisted for Structural Contractor of the year 2005. The structure comprised 3D RC raking columns, curved & raking fine finish walls, and Post Tensioned slabs which we had full design responsibility. Full technical details are available separately. Our package was featured by Building Magazine in August 2005.
Roche New HQ, Shire Park, Hemel Hampstead
We delivered this package in two phases, Phase 1 being enabling works which consisted of excavation and part of the drainage scheme. Phase 2 completed the drainage constructed the retaining walls and external works. There is a large amount of granite paving, laid to a very high specification and tolerances. The striking feature of the externals is the granite clad water feature.
Big Yellow Storage, Finchley & Norwood
We were employed to excavate and form the substructures for both of these public access storage centres. The basements included all temporary works and design, which was critical as the small footprints required minimal struts & props so as not to impede construction of the permanent works. We designed a sheet pile solution with a capping beam, which worked well even in the close proximity of adjacent buildings. Both basements were watertight construction using Caltite & Volclay, which form the climate controlled storage areas
260 Goswell Road, Islington N1
The project involved the removal of the cores to the old gin distillery and converting it to a state of the art communication centre. Our package included underpinning & extending the existing basements and forming foundations in confined spaces. Other works included basement & ground level services, hard landscaping and the construction of intermediate floors. The finished structure provides a mix of modern design in the cores whilst maintaining the buildings character behind a listed retained facade.
41 Lothbury, London, EC2
We were initially engaged to carry a temporary and enabling works package that consisted of underpinning, facade retention and structural modifications to the various levels of basement. A major factor here is that the street level floor is a grade II listed banking hall, which was to retain its original features. Following on from this package we took on all of the structural modifications and insitu RC works and managed a complex interface with the steel Frame and M&E contractors.
140 Park Lane, London W1K 7AA
Working from within the existing retained building, we excavated to -8m whilst the demolition was in progress. Making structural modifications to the existing basement we erected a 9 storey part Post Tensioned RC frame incorporating a swimming pool into the basement. The new frame was to take the weight of the existing structure; we installed a series of jacks to progressively shift the loads when the frame had gained strength this also helped control movement & settlement. In effect the structure was held in cantilever and lowered onto the new load bearing frame. This of course was carried out within the restraints imposed by a busy city centre location.
Pfizer UK, Building 500 Sangate, Kent CT13 9NJ
Civils Externals Package to extensive R & D facility. This £250M Research and Development facility is part of the £600M Pfizer Pharmaceuticals Campus This prestigious building is the largest facility on the Pfizer campus and was completed within 3 years with an excellent site safety record.
Silken Hotel, The Strand, London
We were contracted to undertake the civils element of this extremely complex basement reconstruction. Works included the bulk excavation, contiguous piled wall and the design & installation of temporary propping associated with stabilising the existing retaining walls & foundations whilst excavating to a depth of 16 meters from pavement level. We undertook the construction of new foundations to the existing 1903 facade wall with a combination of mini piles and underpinning along the 115m extent of the existing wall.
Barking Town Centre, Barking
The first stage in the development of Barking Town Centre will provide 200 flats in a new building over the existing library which is refurbished and remodelled to form a new LifeLong Learning Centre. The £27 million scheme, next to the existing town hall, will include the creation of a new civic square.
Harris Academy at Stanley. South Norwood
This enabling works package involved the demolition of 3 main structures and some ancillary timber buildings. The bulk excavation required a 6m split level RL dig across a 13000m2 site this made the temporary works and logistics an interesting feature, which was a substantial sheet pile retaining structure which forms a part of the permanent works. Being a residential area, our method of piling used a TOSA rig which hydraulically pushes the sheets into the clay using water jets to clear a path for the sheets.
Regents Quarter, Kings Cross, London NW1
This major regeneration scheme directly to the east Kings Cross railway station sets new buildings sensitively amongst restored Victorian warehouses and other industrial buildings. The new buildings are of a similar scale to the Victorian warehouses and use a sympathetic palette of materials to remain in keeping with them. The blocks are linked by a network of pedestrian routes and interspersed with courtyards.
Burlington Street London W1
Construction and refurbishement of an existing basement including temporary works within an existing facade in a tight West End location. All concrete to the foundations and the the profile metal decking was also part of the package. Tight site controls were required to allow the sequence for the new basement to be installed within the existing footprint.
British Library, London NW1
We were engaged to construct an extension to the British Library where sound recordings can be archived. The scope includes demolition, drainage a spilt level RC basement, and groundworks, together with superstructure concrete works of columns & beams and toppings to the steel frame. The basement construction was interesting as it forms the sound recording studios where archive material will be transferred to digital media. It is designed to be as sound proof and vibration free as possible. With the LUL close-by this meant that anti-vibration measures where required. In effect we constructed a series on RC boxes which sat on special rubberised bearing pads. These sound rooms are pods inside the new structure and we had to develop some specific formwork support methods to construct the slabs/soffits.
215-219 Oxford Street
With a footprint area of only 600m² the construction of a reinforced concrete sub structure and a six storey in-situ RC superstructure which has one-way spanning pre-cast concrete plank floors and sandwiched between offices & shops, proved to test our logistical and planning skills. The superstructure is made up from a system of load bearing walls via two number lift cores and columns supporting flat slab floor plates which form the Ground Floor up to the Roof. There are concealed drop beams within the Ground, 1st & 3rd floors
Watsons Close, Thurrock
Construction of some 11,500m2 of 175mm thick air entrained C35 concrete hardstandings in 30 x 6 meter bay sizes. Installation and construction of joints including induced and expansion of all associated surface water drainage including interceptors undertaken in a 12 week duration averaging 3 bays per day pouring. Preparation including sub-bases and reduced levels by others.
Doric Villa
The works at Doric Villa comprised contiguous piling to the existing basement and capping beams to contiguous piling. O'Keefe Construction undertook to the bulk dig excavationn and subsequent installation of temporary support works. Together with installaing the waterproofing system, O'Keefe constructed the basement slab including below slab drainage and services and a suspended ground floor slab.
Westwood Cross Phase II, Broadstairs, Kent
The contract was awarded in 2 phases to stabilise the existing ground to provide a piling mat and then to break down piles by drilling and bursting. We constructed the RC pile caps and ground beams, below slab drainage, services and concrete floor slabs to 9 retail units. An area was excavated to receive stormcell attenuation tanks and drainage and ducting installed below slab. Further works included the concrete service yard with dock levellers, ramps and stairs, tarmac areas, retaining walls and timber ramps to the carpark area for 200 cars.
Syon Park Hotel
At this historic location in Syon Park, Brentford, we were contracted to carry out the Groundworks for a new hotel within the existing grounds. Preliminary works included Stabilisation to 4no blocks, basement excavation and capping beams to sheet piling on basement perimeter. Further works include basement slab construction with underslab drainage and services installation
The Cutty Sark
The overall project will see the Cutty Sark re-launched as an internationally important visitor attraction. The ship will be raised almost three metres above the current position and suspended to allow viewing platforms beneath the extraordinary hull design. O'Keefe Construction have been involved in the Groundworks of the project; constructing pile caps and ground beams to the dry dock perimeter and Basement Structures to Bow and Stern end of the ship.
Bankside Substation
Improvement works to the foundations including, pile caps, drainage pits & sumps, cable duct blocks, suspended slabs, upstands & sundries to enable the installation of new electrical plant equipment to modernise the existing sub-station
107 Cheapside
The contract consisted of the integration of a new extension to the rear of an existing building. O'Keefe undertook the construction of new pile caps & basement structure including 3 new concrete cores from basement to roof level and new concrete decks supported on permanent metal decking
Leyton PFI School
Under our mobile plant licence the O'Keefe Group carried out the Soil Remediation of this former industrial complex and installed a 1 meter soil stabilsed raft on top of vibro compaction piles. This allowed radical redesign of the original proposed foundation plan enabling large savings to be passed back to the client. O'Keefe Construction went on to complete all the drainage, groundworks and external works to this PFI school
Mid Kent College, Gillingham
The contract consisted of the breakdown piles and contruction of pile caps & ground beams to 3 blocks, 4 stories high with below slab drainage, insulation and waterproofing. We excavated and installed interceptor tanks and large soakaway pits to the external areas; constructed tarmac and grasscrete car parks for 1,000 cars and access for bus drop off; together with all external works, hard landscpaing and street furniture; retianing walls and gabion/crib wall retainers. Plus additional adopted 278 agreement works to main access road to allow safe crossing for pedestrians and widening from single lane to right hand turning, along with new services and wider footpaths.
79-89 Uxbridge Road, Ealing, London W5
The works comprised pile caps, ground beams and basement structure which included underslab services and drainage. Using specialist PERI Formwork we also constructed 1 no Lift Lobby Core and 2 no Stair Cores, 7 stories high. Slabs at all levels comprised of holorib decking with concrete in-fill.
Admirals Park Phase 2, Dartford, Kent
Soil Stabilisation, In-situ RC Frame and External Works Package, including adoptable Access Road and Drainage Connection to main Boulevard
Blighs Meadow, Sevenoaks, Kent
Constructiuon of complex sub-structures and external works packages to this shopping centre. Roads and bellmouth onto existing roadway, phased woprks to allow public access to existing shops.
Bow Call Centre, Wellington Way, Bow, E3
Construction of a 9m deep basement in a very confined site including the installation of silent piles with very stringent vibartion controlled measures, bulk excavation, the installation of heavy temporary works and all reinforced concrete elemtns to allow the structure to be built up form
Centrium Phase II, St Albans, Hertfordshire
Groundworks, car parking and external works to two office buildings within an existing out of town occupied office complex. Care was required to ensure the current occupants of the prevoulsiy completed units suffered no restrictions during construction.
Dolphin Centre, Dolphin Approach, Romford, Essex
47,000m3 bulk excavation, installation of temporary works and heavy foundation installation into a tight town centre site with a busy existing retail use. Tight traffic controls were needed to be developed to allow the extraction of the bulk excavation and the continued unrestiricted use of the existing retail facilities.
Ealing Gateway, Uxbridge Road, Ealing
Groundworks, RC frame and external works for a commercial office in Ealing. O’Keefe pioneered a method for combining table form construction to the perimeter of the floors and Peri Skydeck to the internal footprints to give a very fast construction sequence.
Folkestone Academy, Folkestone, Kent
The contract included all sub & superstructure works, plus external works package incorporating hte installation of road traffic lights and security fencing and "tie-ins" to existing vehicular access points & public roads.
HMP Chelmsford, Sprinfield Road, Chelmsford, Essex
The works consisted of 3 separate phase comprising the new Visitors Centre with Car Parks, the new Workshop with External Landscaping and a new Entrance to the Prison. During construction of the visitors centre, we broke down piles and constructed pile caps and ground beams along with diverting existing services, constructing ground floors and 1st floor after completing the steel frame. Part of the works to the new Workshop consisted of excavating and constructing mass foundations for the blockwork building within the prison walls, complete with below slab drainage and services and power floated slabs. New concrete stairs with a wheelchair ramp were constructed to the main prison entrance complete with block paving, ballast rail fencing whilst at the same time allowing normal access to the prison at all times.
Lewisham Academy, St Joseph's Vale, Lewisham, London
O’Keefe had an early involvement in this project and successfully value engineered down the volume of material to be removed off site by adjusting the levels, introducing retaining walls and installing a soil stabilised piling mat. Following this we then carried out the Groundworks and External Works for the project including installation of the MUGA’s
Newham BSF Schools
O'Keefe have been awarded the contracts at three schools in the London Borough of Newham as part of the Building Schools for the Future (BSF) Programme. The contracts for Rokeby School and Lister School will see these educational establishments rebuilt, and Sarah Bonnell School will be remodelled and refurbished. The BSF programme is the largest schools capital investment initiative for over 50 years, providing new schools and improving current facilities.
North Farm Industrial Estate, Tunbridge Wells, Kent
The construction of a new retail park and entrance on existing roads including 278 adoptable works associated with widening of existing main road for filter lane and including the installation of traffic lights and pedestrian crossing lights.
Olympic Park, Stratford, East London
Ground clearnace, demolition and removal of existing structures from northern area of the Olympic Park development. Difficult underground structures, temporary works requirements and a plethora of existing services were managed by our site team. All demolition waste was crushed and recycled with our own machinery for re-use within the development
Great Cambridge Road Industrial Park, Progress Way, Enfield
Groundworks and External Works to set of industrial units in Enfield finished on time and within budget
Romford Market, Romford, Essex
47,000m3 bulk excavation, installation of temporary works and heavy foundation installation into a tight town centre site with a busy existing retail use. Tight traffic controls needed to be developed to allow the extraction of the bulk excavation and the continued unrestiricted use of the existing retail facilities.
Sainsbury's Richmond Road, Kingston-upon-Thames
O'Keefe were employed to carry out the groundworks, external works, fibre concrete slabs and connection ramps to the precast concrete car park. After only a few weeks into the project a major issue developed in that large volumes of unexpected contamination were found amongst the original ground conditions. O'Keefe worked with its client and its chosen engineers to source the most competitive methods for disposal and managed the operation without delay to the project.
Slough Schools, Slough
Soil stabilisation, groundworks, RC frames, external works, MUGA’s, sports pitch construction and car parks to three schools which all commenced at the same time. All sites had an existing school present and so great care was required in liason with the existing schools and care due to the close proximity of children and parents.
TAG McLaren, Woking
O’Keefe Construction was employed to undertake the construction of the VIP Access Roads and lake views. The access road was to be a prominent feature in the final design of the building as this was the first view the VIP guests who attended the facility would get of the building. The lakes had a secondary function of being used to cool the building and an advanced filtration systems made up of various aggregate elements was sourced from Europe.
University of East London, Student Accomodation
Particular attention had to be paid to environmental issues as we were working dock-side of the Royal Dock and almost under the flight path of planes out of City Airport. The project included the groundworks and external works to this Student Village
Winnington Close, Hampstead, London N2
Construction of a residential basement to house a cinema room, swimming pool and fitness suite in an exlcusive private road including buk excavation, mini piling, temporary works, waterproof design and installation and RC concrete.
World Business Centre, Heathrow
O’Keefe were employed under a design and build form of contract for the construction of this office space. Using innovative in-situ concrete methods the programme was restricted to minimum to ensure the project was handed over early. O’Keefe employed Weeks Consulting to carry out the RC design of the frame.
Iron Mountain, Isis Reach, Belvedere Kent
Site clearance including the demolition and breakout of previous foundations to a power station, probing for the CFA piles, foundations and general groundworks and service yeards to a large 60,000 m2 industrial shed.
Dartford and Gravesend Hospital
Preliminary Site Investigations identified the soft clay, gravels & chalk ground as being suitable for stabilisation and tests confirmed that this would be a viable alternative to using imported granular fill. After laboratory testing of the existing ground, the appropriate binder and binder content was identified for the required engineering properties. The Engineer, Symonds Group, ensured that DOT Specifications were met. By constructing the sub-base and capping layers via stabilisation the importation of aggregate was unnecessary, resulting in significant cost savings, which in turn resulted in the elimination of some 3,000 potential lorry movements in the local area. Furthermore, the stabilised material demonstrated substantially enhanced engineering properties, enabling the Main Contractor to reduce the amount of bitumen required for the Car Park surface.
A6 North of Bedford
The clay soil on the site contained high concentrations of sulphur and sulphates and there was a clear risk of heave due to the formation of ettringite. After comprehensive laboratory testing, O'Keefe Soil Remediation developed a mix design in association with Symonds that minimised the risk of the sulphates and gave an increased ease and rate of construction using a lime and GGBS blend. All works were carried out strictly in accordance with the Specification for Highway Works with comprehensive compliancy testing throughout the works. A more in depth Case Study is attached, detailing plant and materials used and highlighting the cost saving advantages.
Stratford City Development
We were approached in March 2007 with regard to the new Stratford City Development as part of the Olympic development by the developer Westfield Shoppingtowns Ltd. Their problem was a trying to overcome the difficult soil which had been deposited on site from the CTRL works several years before. Our solution dealt with planning the lime hardened deposits and re-stabilising with cement to form piling mats using this and other non-hazardous material. This resulted in a platform which had to achieve a compressive strength of 3N/mm2 and a CBR in excess of 100%. We have the capability to design piling platforms and have our own laboratory within the Greenwich office which is dedicated full time to the stabilisation of soil projects.
Bournemouth International Airport
We worked on the construction of two new aprons at Bournemouth International Airport. Here we produced a high strength capping layer to 15% CBR which received wet lean and PQ concrete. The candidate material was sandy/gravel and the capping layer was 300mm thick. O'Keefe Soil Remediation carried out the earthworks operation on the project, co-ordinating deliveries within the airport and working on both landside and airside.
Tilbury Docks
At Tilbury docks, we had to produce a high strength capping and sub-base layer. This involoved the stabilisation of an alluvium layer at depth and forming an upper layer consisting of the re-used (planed)tarmacadam and made ground material to produce a high strength sub-base. The PQ concrete was directly placed upon this high strength upper layer. A CBR of 30% was achieved at the capping layer, with the overlying sub-base achieving over 100% with a target of 50%.
Birmingham, Severn Trent Water
The site involved the lime improvement of a sludge which had been deposited at the bottom of a number of holding tanks within the Water Treatment facility. O'Keefe Soil Remediation subsequently improved the material to a suitable condition where it could be transported via road for use as an engineered fill.
Cardiff International Sports Village
This site invloved the transportation of excavated spoil form the main part of the site, hauling via road to an adjacent planned car park area and the stabilisation of this "unwanted" soil. The earthworks were carried out by O'Keefe Soil Remediation, and a single layer stabilised sub-base was formed upon which macadam base/wearing course was directly applied. We were careful to trim the site to the correct level using our 3D modelling system within our grading equipment and achieved a finish of +/-15mm. The achieved CBR was 30%, and all "unwanted" soil was used within the formation of the car park, which was calculated by our modelling systems.
Romney Marsh, Little Cheyne Court Wind Farm
A difficult site in Romney Marsh, Kent with strict environmental constraints, in which O'Keefe Soil Remediation designed a solution which invlolved the improvement of a lower capping layer, associated earthworks and formation of an upper sub-base layer. This was to sustain the loads imposed through the construction period, including crane lay-down areas and haul roads which were topped off with imported granular material to pro-long the life of the road into a permananent access road. Our criteria was to achive a 25% CBR over a two layer solution, including earthwork. The site was completed in the period between October and February in marshland.
Millennium Dome, Greenwich
The Soil Stabilisation at the Millennium Dome site was undertaken using a purpose-built Wirtgen stabilizing machine, the first in the world to incorporate a 4 tonne on-board hopper. This meant that the lime and cement binders were discharged at the prescribed rate via computer control and were thoroughly mixed with underlying soil by the machine’s rotating mixing drum. The enclosed nature of the mixing drum virtually eliminated dust emissions. This was an important environmental factor when considering the location and nature of the site. A detailed Case Study produced in association with the British Cement Association is attached for further information.
Docklands Campus, University of East London
Instead of importing thousands of tones of freshly quarried aggregate, the materials already available in the ground were used to create car parking, roads and paved areas. Retaining the original dockside, cement stabilization was used to treat in-situ sands, gravels and clays in order to provide the sub-base and road-base for an additional 45,000m2 of space. By adding binder to the ground using specialist recycling machinery, O'Keefe Soil Remediation were able to achieve strengths in excess of 50% CBR.
Grain Power Station
As part of an estimated £500m investment, E.ON is building a gas-fired combined heat and power (CHP) station, expected to begin commercial operation in 2010. This will make Grain one of the worlds largest CHP plants. O'Keefe's undertook the Civils Works including; excavation and disposal of material on site; break down of piles for inclusion within the works; formwork, rebar and concrete to form bases, walls & beams; installation of movement joints, waterbar and sealants. The Pipe Encapsulation Works involved the formation of capping with existing materials.
SMARTR Processing Facility, Silvertown
In conjunction with a leading European Soil Treatment Plant specialist we designed, developed and manufactured two mixing machines that grade, stabilise and treat excavated utility arisings to produce a Hydraulically Bound Material (HBM) that is used as replacement for MoT Type 1 for backfill in trench reinstatements. This process is called SMARTR: Stabilising Materials from Arisings - Re-grading and Treating for Re-use. The process and material is designed to achieve the performance of a Structural Material for Reinstatement (SMR), as defined under the New Roads and Street Works Act 1991 in the Second Edition of the Street Works code of Practice: Specification for the Reinstatement of Openings in Highways. The material we produce is known by its trade name PAVIMENTUM (abbreviated to PV1). With extensive experience in soil technologies we are able to assess the properties of the arisings and develop a material to meet the reinstatement requirements for Laing O'Rourke and EDF Energy. This enables our client to re-use as much as 98% of what was previously sent to land fill sites by also producing: sand, shingle and crushed concrete. The SMARTR process not only provides a more environmentally sustainable approach to utility works but offers cost savings from the increasing landfill taxes. We work very closely with the Laing O'Rourke team and provide on-going training with Operatives and Managers to ensure all users are fully compliant with the correct storage and placement methods of PV1. The plant at Atlas Road was purpose built for this contract and all operations are integrated into Laing O'Rourke's existing procedures to ensure ease of use that has also helped reduce grab movements to maximise efficiencies and reduce their carbon footprint.
IBC/MPC, Olympic Park
Concrete foundations and steel frame to Main Press Centre (MPC)and International Broadcast Centre (IBC) on the Olympic Park. The Groundworks also include Cast Iron Drainage to slabs and installation of Foul and Surface Water Drainage.
SMARTR Facility, Chatham, Kent
At Chatham Docks we produce a selection of Hydraulically Bound Materials and Recycled Aggregates for use in Road Construction, Highway Reinstatement and other applications for the Utilities and Construction Industries. Materials range includes; Graded Crushed Concrete Oversize Gravels Recycled Gravels Sand Recycled Type PV1 SHW Type 1 SMF (alternatice to 6F1) All our materials are tested regularlay to meet required standards and with the facilities that we have developed at Chatham Docks, bespoke materials can be engineered to meet your needs.