Phi Group presentation folder

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Retaining WallsReinforced SoilSoil Nailing

Keller UK

Keller Ltd has five UK operating divisions offering piling, ground improvement, retaining structures, geotechnical monitoring equipment and drilling consumables.

Keller is renowned for providing innovative and cost effective solutions to ground engineering and foundation problems.

Keller has unrivalled coverage in the United Kingdom and Ireland where its services are used in infrastructure, building and civil engineering projects.Not only does Keller offer a wide range of geotechnical solutions, but is backed by extensive experience gained by technology transfer from operations in Europe, North America and Australia.Whether your site has a foundation, environmental, stability or ground water problem, Keller has the solution.

• Vibro Stone Columns• Vibro Compaction• Dynamic Compaction• Driven Cast In Situ• CFA Piles• Precast Piles• Piled Retaining Walls

www.keller-foundations.co.uk

• Grouting Solutions • Restricted Access Piling & Mini Piles • Soil Mixing • Ground Anchorages • Pali Radice & Multibell Anchors• Slurry Cut-Off Walls & Membranes

www.keller-geotechnique.co.uk

Phi Group is a Trading Division of Keller Limited

Getec UK provides real time monitoring systems that serve the construction and tunnelling industry. Specialise in providing bespoke geo-structural monitoring schemes.

www.getec-uk.com

Phi Group is the largest retaining solution specialist in the UK, designing supplying and building retaining structures. A complete service is offered including design, supply and construction undertaken by the company’s in house engineers and backed up by full indemnity insurance.

Based in Cheltenham with regional offices in Maidstone, Wetherby and Dunfermline, the company has remained at the forefront of retaining structure technology for over 25 years, balancing engineering demands with environmental consideration. Phi Group’s directly employed experienced construction teams operate nationwide completing the total design supply and build package, affording, optimum peace of mind and minimum risk to client and contractor alike.

Phi Group’s procedures follow an Integrated Management System which has resulted in ISO1400, ISO18001 & ISO9001 accreditation. Phi Group provide retaining solutions to a wide range of market sectors utilising our own extensive range of products and systems, of which many have BBA technical approval. If you have a project requiring a retaining structure or slope stabilisation, Phi Group will be happy to supply you with a free quotation. Please send us your existing and proposed levels survey together with any available site investigation information to see how we can be of assistance.

Introduction

Dunfermline15 Pitreavie Court, Pitreavie Business Park, Queensferry Road, Dunfermline KY11 8UUTel: 01383 749 560Email: [email protected]

WetherbyTemplar House,1 Sandbeck Court,Sandbeck Way, Wetherby,West Yorkshire LS22 7BATel: 01937 545111Email: [email protected]

Contacts MapContacts Map

Phi Group Head Office:Hadley House, Bayshill Road,Cheltenham, Gloucestershire GL50 3AWTel: 01242 707 600Email: [email protected]

Keller Corporate Office:Oxford Road, Ryton-on-DunsmoreCoventry CV8 3EGTel: 02476 511266Email: [email protected]

MaidstoneMereworth Business Centre, Danns Lane, Mereworth, Maidstone Kent ME18 5LWTel: 01622 816 780Email: [email protected]

Section Overview Section Overview

Gravity Retaining Walls Gravity walls use self weight to counteract the earth pressures and surcharge loadings and can be constructed from various systemsPermacribAndacribGabionsLockstone

Reinforced Soil Solutions The use of reinforced soils is mainly used in areas of fill to support elevated levels. These walls can be vertical with the block wall systems, or have a stone/soil finished batter between 50 and 70 degrees.TextomurTitanGeolockConcrete Panel System

Soil Nailing & Facings Soil Nailing is a method to stabilise existing embankments using grouted steel bars. A facing can then be applied to create the required aesthetics, be it grass, stone or other Phi Group systems.Soil Panel

Case Studies

Permacrib Acoustic Barrier, Puglia, Italy

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Gravity RetainingWalls

Gravity Retaining Walls


The concept of gravity retaining walls is that the weight of the retaining wall resists the overturning moment and sliding forces applied by the ground behind. Typical examples of this can include crib systems, gabions, mass concrete, brick work walls etc.

Most gravity wall solutions are installed at a batter, which enables a more slender structure depth to be employed, saving on both space

and cost. As the wall relies on mass to retain the earth behind, the higher the retaining structure is, the deeper the structure needs to be. The type of retained soil also has a bearing on the structure depth required. The crib type structures are typically filled with a well graded granular stone 75mm down in size. The gabion structures will use a 150-200mm stone. All of our gravity solution designs are carried out in accordance with EC7.

Idealised Section through a Gravity Wall

The chart below shows typical wall heights for Gravity wall systems for varying soil properties and surcharge loading. These values are for guidance only and should only be used for

approximating the system sizes. A Full design taking into consideration the actual site parameters, loading, position, and soil types must be carried out.


Gravity wall systems

Assumed surcharge slope of 5° and loading surcharge less than 3 kPa

All the above systems can be used for higher retained heights by combining header sizes to create multi-skin walls.

All the above systems can be used for different soils and surcharges than shown, but sizing will vary more depending on site specifics.

System & Header Size Ht 1m 1.5m 2m 3m 4m 1m 2m 3m 4m 5m 6m

P X X X X P X X X X X

P P X X X P P X X X X

P P P X X P P P X X X

P P P P X P P P P X X



P P P P P P P P P P X

P P P P P P P P P P P


P P P P X P P P P P X

P P P X X P P X X X X


P P P P P P P P P P P

Permacrib 600

Permacrib 750

Permacrib 900

Permacrib 1050

Permacrib 1200

Permacrib 1350

Permacrib 1500

Permacrib 1650

Andacrib Maxi

Andacrib SuperMaxi

Gabions 1000

Gabions 2000

Gabions 3000

Effective angle of internal friction for soils 30° to 35°

Effective angle of internal friction for soils 36° to 40°


Permacrib is our timber crib retaining wall system using patented interlocking components.

These components form a series of open cell modules which are filled with well graded crushed stone to create the required mass. Permacrib’s lightweight components mean that the system is built by hand with no special plant requirements enabling extremely fast production rates. Permacrib can be fully landscaped with a variety of plants in order to enhance its natural appearance.Permacrib is manufactured from selected

Radiata Pine softwood from managed, cultivated, renewable plantation resources and is from FSC certified sources. All components are pressure treated to BS8417:2003 using High Concentration Copper Azole preservative. The Permacrib system has a design life of 60 years and is maintenance free. The Permacrib system is the only timber crib system that has been awarded a British Board of Agrément Certificate.

Permacrib


Permacrib

Design versatility of the 8 readily available models enables header sizes to be mixed within the same structure for maximum economy. In higher structures double or triple skin walls can be built.

Face profiles can be varied to form benches to assist landscaping and enhance architectural appeal. Angle changes and curves are easily followed.

TYPICAL CONSTRUCTION DEPTH (m)System & Header Size Ht 1m 2m 3m 4m 5m 6m

0.98

1.13 1.38

1.27 1.52 1.77

1.47 1.72 1.97 2.22

1.86 2.11 2.36

2.31 2.56 2.81

2.70 2.95 3.20

3.15 3.40

Varies on combination of models used

Permacrib 600

Permacrib 750

Permacrib 900

Permacrib 1050

Permacrib 1200

Permacrib 1350

Permacrib 1500

Permacrib 1650

Double skin

The construction Depth is measured from the front face of the foundation to the rear of the crib wall at the top, but does not include the cut profile required for the retained soils which is dictated by soil conditions and safe working practices.


Andacrib is a modular pre-cast concrete crib retaining wall system which has been designed to cater for the most onerous loading conditions demanded of structures in highway, industrial and commercial sectors.

Andacrib’s unique design, incorporating generous header to header bearing surfaces, ensures that all primary loads are remote from the exposed face.Design versatility of various models sizes can be mixed within the same structure for maximum economy or in major structures double or triple skin walls can be built.

Angle changes and curves are easily formed. Andacrib can be fully landscaped with a variety of plants in order to enhance its natural appearance.The Andacrib components are machine placed into position and build rates of 30m2 face area per day can be achieved. This offers considerable savings in construction programme over traditional methods.

Andacrib


Andacrib components are cast in steel moulds to ensure a consistent quality both in terms of finish and dimensional accuracy. They are manufactured in a quality assured environment to ISO9001:2008.

All components are designed in accordance with Eurocode 2: Design of Concrete Structures.The high strength concrete combined with generous reinforcement cover give Andacrib structures an anticipated design life of 120 years in almost any application.

Andacrib

TYPICAL CONSTRUCTION DEPTH (m)

System & Header Size Ht 1m 2m 3m 4m 5m 6m

1.53 1.70 1.86

1.97 2.14 2.30 2.47 2.64

2.03 2.20 2.36

2.59 2.75

Andacrib Maxi

Andacrib Supermaxi

Double Skin Maxi

Double Skin SuperMaxi

The construction Depth is measured from the front face of foundation to the rear of the crib wall at the top, but does not include the cut profile required for the retained soils which is dictated by soil conditions and safe working practices


Gabions are gravity retaining walls consisting of a series of stone filled rectangular baskets, the mass of which is designed to resist the earth pressure.

These rectangular baskets are formed from panels of wire, either woven or welded mesh, and incorporate internal diaphragms and bracing wire to enhance stability.Gabions are also widely used as architectural cladding to buildings and also to form free standing visual and acoustic barriers.

Gabions


Lockstone is a modular, dry laid, interlocking, hollow, concrete block walling system which can be constructed to form complex horizontal curves.

The blocks can be filled with topsoil, gravel or concrete, and can be built with either the curved or the split face showing, depending on the required appearance and application. A variety of block colours are available. When filled with soil and planted with ground cover shrubs, the Lockstone system provides a naturally ‘green’ and aesthetically pleasing solution to slope retention problems.

Lockstone

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Reinforced Soil

Reinforced Soil Solutions


The use of reinforced soils is mainly used in areas of fill to facilitate the raising of levels on site.

Reinforced SoilThe reinforced soil fill material is compacted in layers with intermediate layers of geogrid or steel reinforcement. This reinforcement improves the strength of the fill material and creates a block of reinforced soil.This block has the strength and mass to resist the ground pressures from behind, but can also take very large loads transmitted vertically. The internal strength of the reinforced block is calculated using the tie back wedge method, to ensure the reinforcement is of sufficient strength to create a homogeneous block.The type and length of the reinforcements is designed to suit the site specific requirements, and will also be determined by the soils chosen for the reinforced fill.

Reinforced soil slopes are installed at angles up to 70 degrees. There is scope within these slopes to re-use selected site won material. This is of particular importance if on a cut and fill project.Reinforced slopes over 70 degrees are usually classed as a structure and will typically have a modular block or concrete panel facing.

Idealised Section Through Reinforced Soil


Where to use Reinforced Soil• Forming steep face cuttings and embankments for Highway widening schemes.• Slopes for railway schemes.• Environmental and acoustic bunds to screen industrial installations.• Repairing failed slopes.• Extending site areas to maximise plateau space for new commercial developments.

Typical Imported Fill SpecificationDescription – Free draining and readily compacted material comprising: Natural gravel, natural sand, crushed gravel, crushed rock, other than argillaceous rock, crushed concrete, slag, well burnt spoil, or any combination thereof.

Grading – Reinforced fill material shall comply with the following grading:-Sieve .............% Passing75mm ...........900.6mm ..........<3075 Microns ...<10

Uniformity coefficient to be greater than 10Alkalinity: pH<10Moisture – Supplied within + 2% of OMC determined in accordance with BS1377:Part 4 (Vibrating Hammer Method).

Site Won Material Fill SpecificationThe Textomur reinforced soil system lends itself very well to the use of site won material as reinforced soil fill. The use of site won reinforced soil fill will be dependent on weather conditions as the moisture content of the material supplied will need to be within +/-2% of its optimum dry density moisture content to achieve the necessary compaction. Phi Group will be able to advise on the suitability of site won material upon receipt of the necessary test data.

To ascertain the suitability of the site won material we would require the following laboratory testing to supplement the current soil investigation.

• Grading/Sieve Analysis – to classify the soils• Moisture Content• pH Testing• Shear Box Testing – to determine soil shear strength• Maximum Dry Density/Optimum Moisture Content - to determine compaction effort

Reinforced Soil


Textomur consists of horizontal geogrids or geotextiles typically at 600mm vertical centres within compacted cohesive or granular fill material. The facing to the slopes is formed using a steel mesh ‘formwork’ backed by a geosynthetic facing fabric which retains a layer of topsoil immediately behind the face.

The finished slope can be hydroseeded to establish grass, or planted with appropriate ground cover shrubs. A stone face finish can also be specified.The Textomur system can easily be built with curves, corners, terraces, varying wall heights and steps. The system has a minimum design life of 60 years.Textomur can be built utilising site-won fill materials, which can generate substantial savings on import of granular fill and disposal of excavated material from site.

Textomur


Quick to construct with no structural foundation required.Construction is entirely from behind the face of the slope, and no temporary propping is required.A variety of face angles and finishes can be specified.

SpecificationThe Textomur facing components are delivered to site pre-formed at the slope angle required ready for construction. The

reinforcement length is dictated by the retained height and type of reinforced soil fill material to be used. For imported granular fill material the reinforcement length would typically be 0.7 X retained height. If site won cohesive soils are deemed to be acceptable for use, the reinforcement length can increase to up to 1.5 X retained height. Loadings above the wall and slope angle also have a bearing on reinforcement length.

Textomur


Dry Laid Modular Block retaining wall systems offer affordable solutions to earth retention needs.

FeaturesPhi Group’s dry build modular block systems use either steel ladder or geogrid reinforcement and will be installed at near vertical. The Modular Block systems will require the use of a well graded granular material to form the reinforced soil mass.

Modular Block


Blocks will typically have a split faced appearance that gives a high quality architectural finish. Banding and recesses can be incorporated into the face to create architectural features if required. The high quality finish that is achieved means that no additional facing is required, as there may be with a traditional reinforced concrete wall. Modular block walls are quick to construct and require no additional aesthetic facing. Consequently considerable savings in the construction programme can be achieved.

The entire structure can also be constructed from the rear of the wall and therefore next to the site boundary. As with many of Phi Group’s solutions, the modular block system is very flexible and can be constructed either with graceful curves or sharp corners. Modular block face reinforced soil structures

Modular Block

Concrete PanelPhi Group Design, Supply & Install a reinforced earth concrete panel facing system. A robust structure that can accommodate high working and dead loads associated with bridge abutments and other large retaining walls.

are ideal for use when raising levels on site and are utilised in a wide variety of situations, including infrastructure and commercial projects. A BBA Certified design life of 120 years is standard.

www.phigroup.co.uk

Soil Nailing &Facings

Soil Nailing & Facings


Phi Group offer a complete design, supply and installation service using drilling and grouting techniques to stabilise embankments. A large range of plant is maintained to ensure that production rates are optimised in challenging soil types and restricted access situations.

With available development land becoming ever more costly, gaining usable space on steeply sloping sites is paramount, Soil Nailing can offer the following benefits:• Elimination of the need for expensive stone backfill imported to site.

• Existing structures and embankments can be stabilised without rebuilding, saving costs and maintaining serviceability.• Trees, vegetation or architectural features can often remain unaffected by soil nails, as the nails can be sited to pass around or between obstacles.• Using top down construction methods, with each subsequent row of nails providing both temporary and long term support, the need for costly temporary works is avoided. This also keeps the amount of excavation required to a minimum saving on muck away costs that in turn has an environmental impact.

Different types of soil nails can be used depending on the soil conditions on site.

Soil Nailing


Soil Nailing

Idealised Section Through Soil Nailed Slope


Whilst Soil Nails are an effective ground stabilisation technique, they are usually not left uncovered due to soil erosion problems and aesthetic concerns.Phi Group’s ability to combine Soil Nailing with a variety of face treatment options, will ensure that the most stringent of planning and environmental issues are satisfied.

Soil PanelSoil Panel was designed and patented by Phi Group to be used specifically in

conjunction with Soil Nails where the creation of extra space requires existing embankments to be cut back forming steep sloping faces. Whilst soil nailing provides the principle structural support to the cutting, Soil Panel steel cages provide a flexible facing which can provide structural support as well as facilitating an excellent finish.The internal face of the panel forms part of the structural support to the embankment face and the outer, geotextile lined face allows filling with growing medium for vegetation establishment.

Soil Panel

Typical Section of Soil Panel Facing


Growing medium can then be placed into the panel and is either pre-seeded or planted during the growing season.

Vegetation is established by either the placement of pre-seeded top soil within the Soil Panel cages, or by hydro-seeding post construction. Phi Group would recommend a maximum slope angle of 65o if long term growth is required.

Soil Panel


An alternative is to fill Soil Panel with stone and this is often chosen due to restricted light locations or where a zero maintenance requirement is preferred.

For slope angles over 65o where vegetation is unlikely to establish, there is the option to fill the Soil Panels with stone instead. This covers the structural elements of the soil nails whilst also providing a maintenance free facing solution that requires minimum construction depth.

Soil Panel


The Permacrib system can be utilised as a facing, providing an aesthetically soft finish that can be landscaped whilst also hiding the structural soil nails. This facing is particularly common when there are other Permacrib retaining walls on site.

Gabions can be used where space is available. As with the Permacrib, this may particularly be the case if there are other ‘gravity’ retaining walls on site a continuity of appearance is required.

Facing Systems

Phi Group’s Modular Block system is another facing option available. This gives a high quality architectural finish where a vertical facing is required. This also has the added benefit of creating more space at the top of the wall.

www.phigroup.co.uk

Case Studies

CaseStudies

KEY DETAILSSector: RoadsClient: Bristol City CouncilContractor: Alun GriffithsSolution: Soil NailingValue: £115,000.00

THE PROJECTUpon Bristol being awarded ‘Cycle City’ status, a narrow footpath adjacent to a busy railway line was targeted by Bristol City Council with an aim to provide both safe and convenient cycle and pedestrian access.The proposal was to widen the current footpath by excavating into the adjacent steep embankment with no disturbance on the railway.

SOLUTIONPhi group were able to continue a run of successful projects with Bristol City Council, by proposing a complete design and construction solution for a retaining structure with heights of up to 3.0m and over a length of 150 metres.

Case Study

On the right track

CONSTRUCTIONA gabion solution was originally proposed. However, due to the insitu soil conditions, in addition to the depth of Gabion structure, a maximum 25 degree temporary earthworks profile would be required to satisfy safe working practice. Phi Group’s Project Engineers realised that a huge quantity of excavation would be necessary on a restricted access site 400m in length and proposed an alternative solution.

Soil nailing was identified as a practical solution. The soil nailing was undertaken in a top down method as excavation took place. The temporary earthworks profile was excavated to an angle of 70 degrees and permanently stabilised using galvanised soil nails. Due to the tight access on the site, and the requirement to

work adjacent to a live main line railway, our specialist drilling equipment was utilised

BENEFITSAs Phi Group is not tied to one particular retaining system, they were able to develop and change the scheme as revised information became available. The use of a soil nailed solution afforded significant cost and environmental benefits by minimising excavation, muck away and importing of material.

All responsibility for the retaining structures rested with Phi Group, and highlights the strength in depth that the Keller group of companies, providing solutions to all of your retaining and ground stabilisation requirements.

Case Study

On the right track

KEY DETAILSProject: Haywards Heath Relief Road Stage 6Main Contractor: Galliford Try ConstructionClient: Crest NicholsonSolution: Soil Nailing with Soil Panel Facing & Textomur Reinforced EarthValue: £311,000.00

Case Study

Nailing the relief road

THE PROJECTThe Haywards Heath Relief Road was initially given the go ahead in 1998, and construction was tied into a number of housing developments. Phi Group had previously installed soil nails and Soil Panel on Stage 4 of the project in 2003.Phi Group were involved with this portion of the relief road from a very early stage and assisted BTP Hyder with preliminary design of a soil nailed cutting utilising their patented Soil Panel planted facing system and also a Textomur reinforced soil slope. In addition Phi Group also helped prepare the AIP documents to gain approval for the scheme.

Close collaboration with Galliford Try was essential to facilitate the installation of the soil nails in a top down sequence to minimise any temporary earthworks issues and ensure programme was minimised. Once the soil nails were installed then the Soil Panel facing system was installed from the base up, and filled with a growing medium to facilitate growth and present a natural green face in time.

SOLUTIONPhi Group Designed, Supplied & installed some 800m2 of Soil nailed/Soil Panel structure together with 150m2 of Textomur reinforced soil slopes. The programme for the works was 12 weeks.

Nailing the relief road

Case Study

KEY DETAILSProject: Bath Vale, CongletonClient: Matthews & Leigh for Bovis HomesSystem: AndacribProgramme: 8 weeksArea: 600m2Value: £140K

THE PROJECTPhi Group design, supplied and installed an Andacrib retaining wall to retain an embankment providing space for the widening of an existing road required to improve access to a new housing development.

Phi Group worked alongside the consulting Engineer during the AIP and final design processes to receive full approval of the scheme from the local authority.

SOLUTIONThe wall was constructed from a 3 – 4m access strip along to toe of the wall with traffic management procedures in place so to keep the road open. The thin access strip required efficient coordination with the groundworker to ensure the works progressed without delay to the programme.

Case Study

A retaining wall makes a home

KEY DETAILSProject: Tesco HattersleyClient: Morgan SindallSystem: PermacribProgramme: 3 weeksArea: 300m2Value: £60K

THE PROJECTPhi Group design, supplied and installed two Permacrib walls to support the new

car park and service yard access roads.The most difficult wall was constructed around an existing electricity pylon which required careful planning and strict safety measures to ensure the pylon was not damaged and that the excavator would not breach the 5.3m safety zone around the cables.

SOLUTIONPhi Group carried out the foundation excavation and also supplied the backfill material to provide the client with the complete package.

Case Study

Permacrib supports Tesco

KEY DETAILSSector: RetailProject: Sainsbury’s Store NewportClient: J Sainsbury PlcContractor: Kier Construction LimitedSolution: Andacrib Concrete Crib & Soil NailingValue: £350,000.00

THE PROJECTIn 2010 The Ryder Cup was held at The Celtic Manor Resort, in Newport South Wales. On the site of an old gas works close by, J Sainsbury Plc was planning construction of a new superstore and petrol station. Works were planned to be completed to coincide with the event. Kier Group contacted Phi Group at an early stage to help develop a solution to remove an existing 6.0m high retaining wall adjacent to the highway, whilst also cutting into the exposed embankment to create a larger car park. Various solutions were investigated, including piling behind the existing wall, but access issues made these solutions impractical and expensive.

Case Study

Sainsbury’s shop for Andacrib

Sainsbury’s shop for Andacrib

SOLUTIONPhi Group proposed the use of its Andacrib concrete crib retaining wall system. A tough durable system, it is has been used on many projects, including highways and rail projects where a 120 year minimum service life is required. The system can also be landscaped using planting bags that will soften the visual impact of the retaining wall, so is also very popular on housing and retails schemes alike. The Andacrib system is also very quick to construct, with build rates of 30m2 face area per day.

CONSTRUCTIONA particular restraint was an existing public highway situated as close as 10.0m away from the line of the proposed Andacrib retaining wall. As ever, the temporary earthworks issues were paramount, with the local Highways Authority needing to be satisfied that any solution proposed would have no impact of the carriageway above. Phi Group proposed the use of temporary soil nails to stabilise the temporary earthworks

profile as the excavation for the proposed Andacrib concrete crib retaining wall was undertaken. Phi Group undertook the design, supply & installation of both the Andacrib retaining wall and the temporary soil nailing. This was a particular benefit for Kier as it meant that all retaining wall works were in one contractor’s package. Keller Foundations, Phi Group’s sister company, also carried out a considerable amount of piling works for the new store foundations.

BENEFITSPhi Group was involved from an early stage and helped develop the scheme to provide the most cost effective and buildable solution. Offering a full design, supply & installation service, Phi Group took responsibility for not only the retaining wall but also the temporary soil nailing, making use of the strength in depth available within the Keller Group of companies. The solutions provided were quick to construct, ensuring that program was not an issue.

Case Study

KEY DETAILSSector: PowerProject: Beauly Sub-StationClient: Scottish & Southern EnergyContractor: R J McLeodSolution: AndacribValue: £65,000.00

THE PROJECTThe Beauly to Denny High Voltage Overhead Transmission Line runs through the Cairngorms National Park and caused some controversy at planning stage due to the sensitive nature of the land it was passing through.The Engineers for the scheme, The Waterman Group, contacted Phi Group at early stages to discuss the requirement for a retaining wall for Beauly Sub-Station. On the site of a former quarry, a retaining wall was required to support the proposed access road into the site. To add to the complexity of the project, the solution proposed had to take into account 1 in 1,000 storm information.

Case Study

All power to Andacrib

SOLUTIONPhi Group’s Andacrib Pre-Cast Concrete Crib solution was offered as a possible solution. This heavy duty gravity wall solution, with its 120 year maintenance free design life, was quickly adopted bythe Engineer and Client as the most economic and buildable solution. The Andacrib wall is 117m long with a maximum retained height of 5.62m. As can be seem from the photographs, the slope surcharge above Andacrib wall is considerable and has a significant impact on the structure design.As a result, at maximum retained height a double depth structure is constructed to give the required mass.

As the new sub-station was being constructed on the site of an old quarry, the contractor R J McLeod was keen to use material from site as the infill within the Andacrib wall and the backfill to the rear. Whilst the material didn’t immediately fall within our infill specification, Phi Group investigated its possible use to offer the most cost effective solution. After a site

visit and additional testing had been carried out, Phi Group and The Waterman Group agreed on a grading requirement to suit both.The Andacrib wall was constructed to at the beginning of 2012 on programme and on budget. Phi Group are currently working with Waterman Group regarding some reinforced earth solutions to support the new access road junction.

BENEFITSAs a solutions lead company, Phi Group does not promote one particular product. We have a wide range of systems available to choose from, and will propose the most cost effective and buildable solution to meet your requirements. We will also take into consideration other factors such as the temporary earthworks and programme.

Phi Group offers a full Design, Supply & Construction service with responsibility resting in one place. This gives Clients and Contractors peace of mind and one point of contact for the retaining structures on their project.

Case Study

All power to Andacrib

KEY DETAILSSector: RetailClient: J Sainsbury PlcContractor: Buckingham Group Contracting LtdSolution: PermacribValue £155,000.00

THE PROJECTIn 2011 Sainsbury’s unveiled plans to build a 500,000 sq ft distribution centre near Exeter airport. The distribution centre will initially serve 35 stores in the South West, including Devon and Cornwall. The proposed development represents the first phase in the long-awaited Intermodal Freight Facility, now known as Exeter Gateway, which forms part of the East Devon Growth Point.The site is split into two, with differences in levels of up to 6.25m, so a retaining structure was required along a length of 180.0m to retain the car parking area above with the distribution centre below.

Case Study

Distribution centre retaining wall

SOLUTIONWhen Buckingham Group contacted Phi Group, our Permacrib Timber Crib solution was suggested as the most cost effective and buildable solution. Of particular importance was speed of construction and of course cost. With a face area of nearly 1,000m2, Phi Group constructed the Permacrib wall in 5 weeks, using two gangs to shorten the programme. As Buckingham Group was undertaking a large muck shift operation, they wanted to re-use the excavated sand material as the backfill material to the rear of the Permacrib retaining wall. In conjunction with additional testing carried out by Buckingham Group, Phi Group also carried out compaction testing throughout the backfilling operation to make sure the material was suitably placed and compacted. The sand material also became denser as levels were reduced. Buckingham Group asked if the excavation could be steeper than the 60 degree profile specified within Phi Group’s original design. Phi Group re-designed the Permacrib wall based on retaining insitu soils and enabled

the temporary earthworks to be excavated at 76 degrees where the material allowed, therefore saving on excavation and any possible muck away. The Permacrib Timber Crib retaining wall was completed on time and on budget.

BENEFITSAs a specialist contractor, Phi Group’s wide range of solutions means that they can adapt to any specific site requirements. Phi Group offers a full Design, Supply & Construction service with responsibility resting in one place. This gives Clients and Contractors peace of mind and one point of contact for the retaining structures on their project.

Case Study

Distribution centre retaining wall

KEY DETAILSSector: TransportClient: Edinburgh City CouncilContractor: Mackenzie Construction LimitedSolution: Textomur & Modular BlockValue: £130,000.00

THE PROJECTIn 2010 Edinburgh City Counciil released detailed plans for the scheme to improve a length of shared pedetsrian/cycle route from Portobello, through Leith Links to Sandport place. The scheme has been broken up in to various sections, with the scheme as a whole due for completion in 2014. Section 3 is 1.3km long and runs from Easter Road, Leith Links to Seafield Street. It was in a poor state of repair with pot holes and no lighting for the majority of its length.

Case Study

Textomur makes a route

SOLUTIONThe Textomur green faced reinforced earth system was specified to enable the embankment to be extended to 3.0m. Our works in this section included over 800m2 of Textomur, some of which was double sided.One side was approximately 120m long with the other approximately 60m long. Maximum height was 7.15m with the average retained height of 4.5m. We were also able to incorporate stairs and ramps within the design of the Textomur walls to facilitate access. We also constructed a modular block reinforced earth wall which was designed to take a bankseat for a replacement bridge over Seafield Street. We used a ‘Heather’ coloured block which matched the sandstone buildings of the surrounding area. Although this wall was only 12m in length, it incorporated two external corners and was 6.6m high at maximum height.

CONSTRUCTIONThe project was complex from both a design and a construction point of view as the two different systems had to be combined and the reinforcement tie in with each other.The project was completed in 7 weeks despite its complexities. Contract variations and its city centre location with its very restricted access and extremely limited room available made this project very challenging.

BENEFITSThe complex nature of this project, both from a design and construction point of view, meant that Phi Group called on its design expertise and construction experience to ensure the project was completed to the satisfaction of the Client.

Case Study

Textomur makes a route

KEY DETAILSSector: Sunderland AFCContractor: Tolent Construction LtdSolution: Freestanding Gabion WallValue: £155,000.00

THE PROJECTThe Academy of Light is the name of the UEFA five star certified training facilities and youth academy for Premier League side Sunderland AFC. Opened in 2003 the state of the art training facilities are situeated in Cleadon, just north of Sunderland. Sunderland AFC have employed Tolent Construction Ltd to construct a new indoor training area to provide top class facilities all year round.

Case Study

Gabions at the Academy of Light

SOLUTIONThe new facility consists of external steel roof support columns with a canopy that covers the pitch. Phi Group were appointed to design, supply and install free standing gabion walls to provide protection from the elements around the perimeter of the pitch. Openings at six points through the gabion walls were also required to provide access for players and service vehicles. Gabion baskets with 5mm diameter steel mesh panels were used to provide a rigid face, whilst steel support columns were incorporated within the gabion structure to ensure the gabion walls remain vertical. Phi Group also undertook the design of these steel supports and base plates.

CONSTRUCTIONIn total Phi Group constructed 1050m2 of gabion walling, with a construction proramme of 6 weeks. A concrete foundation was first installed, upon which the base plates and additional steel columns, designed by Phi Group, were erected along the centre line of the foundation. The gabions were constructed

on site from bespoke mesh panels, as the vertical joints had to line up with the external steel roof support columns which standard size gabions would not accomodate . Hand placing of the gabion stone to the front face ensured a premium finish.

BENEFITSPhi Group’s design expertise and construction experience came together to provide a high quality structure that met the rigorous demands of the Client. Both current and future Sunderland AFC players will be able to use the indoor training facility for years to come.

Case Study

Gabions at the Academy of Light

KEY DETAILSSector: HealthClient: Tyne & Wear NHS Foundation TrustContractor: Laing O’RourkeSolution: TextomurValue: £82,000.00

THE PROJECTAs part of a £68 million investment plan, Tyne & Wear NHS Foundation Trust pro-posed the re-development of part of the former Ryhope General Hospital site in Sunderland. The proposed scheme includes a new 122 bed hospital and would be built by Laing O’Rourke under their NHS Procure

21 Partnership with the Trust. Extensive enabling works were required on site to facilitate the construction of the new build-ings, with a completion date of Summer 2014 the aim.

Case Study

Textomur for PrIDE Ryhope

SOLUTIONFollowing the demolition of the old buildings on the site of the former Ryhope Hospital, Phi Group were contracted to design, supply and construct two terraced reinforced earth slopes to provide plateaux to allow the construction of Wards 2 and 3 of the new hospital. The majority of the terraces could be formed using unreinforced slopes, however, at two pinch points at the corners of wards 2 and 3 the slopes had to be steepened to 65 degrees due to the close proximity of other building and services. The landscape architect required that the slopes were to have a vegetated finish, therefore Phi Group’s Textomur green face reinforced soil system offered the perfect solution.

CONSTRUCTIONTo minimise both the economic and environmental effects of importing quarried granular fill, the as dug clay from the site was lime stabilised and used in the construction of the reinforced earth slopes. In addition to this, the slopes were designed with a surcharge load of 40kPa to

accommodate the raft foundations for the new wards. Phi Group constructed 550m2 of Textomur reinforced Earth slopes in a 5 week period.

BENEFITSPhi Group were consulted from the early design stages of the project which meant we were able to use our experience and design expertise to offer the Client the most cost effective and buildable solution from our wide range of products. Environmental and aesthetic issues were also taken into consideration. Phi Group provided Laing O’Rourke with the complete package, providing a full design, supply and installation service.

Case Study

Textomur for PrIDE Ryhope

Phi Group presentation folder

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Transcript of Phi Group presentation folder