A Design and Build project in the centre of Cambridge for Land Securities.

The project provides retail and residential units on an extremely confined site sandwiched between Emanuel College and Christ College. As a result there have been significant Party Wall issues to resolve, as well as the need to work around congested existing services in Christ Lane and diversion of an existing adopted storm sewer.

The two storey steel framed structure houses the retail units and supports one and two storeys of apartments over. The apartments are constructed from a proprietary cold-rolled steel framing system in order to reduce loads down on the supporting steel frame. Composite metal deck floors have been used for the retail units. The structure is supported on piled foundations with an insitu concrete suspended ground slab.

Images courtesy of davidstewartphotos.com

A Design and Build project in the centre of Bedford for Complex Developments Projects Limited.

The project comprised of 107 apartments and live-in work units in four blocks, each block ranging from four to seven storeys in height, over restaurant and retail premises at ground floor level. The blocks were generally of flat slab, reinforced concrete framed construction, with the exception of the upper storey penthouse levels which incorporated elements of steel framing. The development is close to the town centre shops, and the historic Castle Mound and river frontage along the embankment.

The site is historically very sensitive, with the eventual foundation solution of highly loaded, large diameter piles dictated by the archaeological requirement to limit below-ground disturbance to an absolute minimum. As such, no pile clusters were permitted and the overall piling solution had to be limited to 2% of the overall development area. PEP’s value engineering of the tender stage foundation scheme resulted in significant cost savings.

PEP are appointed as Consulting Civil & Structural Engineers by our Client, Deptford Projects Ltd, to deliver a £30m mixed-use PPP regeneration scheme, in partnership with London Borough of Lewisham, on a site next to Deptford High Street train station. Following Network Rail’s re-development of the station, work is to commence on a new 10 storey residential building designed by Richard Rogers, restoration of an historic Victorian carriage ramp/arches and a new public square.

A new-build development providing two, three and four storey blocks of apartments constructed over a two storey concrete framed office and retail unit, over a 4m deep underground car park basement structure.

Superstructures consist of RC framed construction for the office and retail units levels, with timber framed construction utilised for the apartment storeys above. The basement is constructed using a perimeter secant pile wall which is propped in the permanent condition by reinforced concrete basement and cover transfer slabs.  A below slab pumped drainage system has been incorporated to alleviate water uplift pressures on the basement slab. Piled foundations were adapted throughout.

PEP have been appointed as Consulting Civil & Structural Engineers by Abbeycastle Management Ltd for pre planning services on the proposed mixed use scheme in Canning Town, East London.  The development comprises up to 250 residential dwellings, associated retail / commercial units and a basement car park.

PEP provided full civil and structural engineering design services for this Design and Build Extracare Residential Home, comprising 55 self-contained apartments plus communal facilities (assisted bathrooms, kitchen, laundry, hairdressing salon, cinema room and lounge) over four storeys. Superstructures are of predominantly loadbearing masonry construction, with hollowcore precast concrete floors and roofs. However, significant areas of steel framing were required at ground floor (to carry loadbearing walls over the communal areas) and to support cantilever balconies to the upper floor levels.

Difficult ground conditions were a key feature of this development, with a very high water table, loose granular subsoils and significant areas of disturbed ground resulting from the demolition of a previous care home on the site. The final foundation solution adopted shallow reinforced strip foundations spanning between vibro-stone columns. The stone columns were taken down through the loose subsoils and disturbed ground to densify both strata, and thereby enabled foundation excavations to be kept above the water table.

The surface water drainage system utilises shallow crate soakaways positioned above the water table.

PEP provided full civil and structural engineering design services for this Design and Build Extracare Residential Home, comprising 50 self-contained apartments plus communal facilities (assisted bathrooms, kitchen, laundry, hairdressing salon and lounge) over three storeys. The development also incorporates 10 intermediate care beds which will be used by NHS Cambridgeshire for patients who need intermediate or palliative care, or rehabilitation. Superstructures are of predominantly loadbearing masonry construction, with hollowcore precast concrete floors and timber trussed rafter roofs. However, significant areas of steel framing were required at ground floor to carry loadbearing walls over the communal areas.

Being situated in The Fens meant ground conditions were poor (a mix of variable soils with poor bearing capacity). As a result the foundation solution utilises piling and ground beams to achieve adequate support to the structure.

Providing adequate foul and surface water drainage were major challenges on this project. Months of on-site investigations and negotiations with Anglian Water, the Environment Agency, Internal Drainage Board, Local Authority and residents were necessary to agree viable solutions. This has resulted in surface water being heavily attenuated on site before being discharged via a previously unknown sewer link to the IDB ditch network, while foul discharge is heavily restricted and discharged via a new pumping station and foul rising main across neighbouring farm fields and into the public sewer network.

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