concrete Precast car park The Avenue MSCP, Bracknell Sustainability by the sea Colwyn Bay seafront Clean water Treating hydro-demolition waste
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1 concrete THE MAGAZINE OF THE CONCRETE SOCIETY Volume 51 November 2017 Issue09 Visit: Precast car park The Avenue MSCP, Bracknell Clean water Treating hydro-demolition waste Sustainability by the sea Colwyn Bay seafront
2 Off-site hybrid concrete construction drives the Avenue MSCP, Bracknell The new major town centre redevelopment at Bracknell, Berkshire was under discussion and planning for nearly 20 years before finally opening in September Norman Brown and Scarlett Allan-Stubbs of PCE discuss the design and build of the development s multistorey car park. Known as the Lexicon, the town centre development has been undertaken by the Bracknell Regeneration Partnership, a joint venture between Legal and General, Schroders and Bracknell Forest Council, to provide much-needed extensive shopping, restaurant, entertainment and facilities to surpass the expectations of today s public. A significant part of the development of this next generation of shopping and leisure facilities is the multistorey car park. Called the Avenue Car Park, it remains open 24 hours a day and provides 1306 car parking spaces including specific spaces for disabled and electric-car charging. With an anticipated average parking time of two hours it was essential that a large volume of cars could easily gain access and egress, with the various levels easily accessible, and to give drivers a good parking experience with their safety and security paramount. The tender period for the whole development started just over three years before the Lexicon s opening date, during the middle of 2014, with the award of the main contract in early During this period, PCE worked in co-operation with Mace, developing a hybrid design-and-build solution, principally using off-site engineered precast concrete components, to provide a solution for the five suspended levels car park structure that would also incorporate an area of multi-level retail space at its front. Minimising the height of the structure was a necessary planning requirement and the development s central location meant that maximising the amount of off-site construction would reduce the total number of vehicle deliveries required to enter the centre of Bracknell, as well as a reduction in the number of on-site operatives and management needed to construct the 18 concrete
3 Frame erection in progress using PCE Slingsafe safety method for safe unloading. Millennium Way elevation, including the dominant ramp structures which assist the architectural aspirations with timber cladding and a living green wall. Car park deck ramp interface. Note the curved ends of the ramps commenced inside of the main structure to maximise site usage. Compared to other off-site solutions of similar span, the GT floor units provide a reduced overall floor depth and structural dead load. The finished car park is attractive for users, with its open approach enabled by the long-span design philosophy. concrete 19
4 structural frame. This produces a faster on-site erection period and a reduction in the overall carbon footprint of the project s construction. Mace was awarded the project in February 2015, which resulted in structural design work starting in earnest, with the commencement of off-site production of the precast concrete units in July, thus enabling the erection of the structure to proceed in late November of that year. Critical The use of three-dimensional BIM techniques was critical during the tender period and following the contract award, enabling PCE to develop the car park element of the structure as an efficient precast hybrid concrete solution using its in-house designed-and-developed long-span GT flooring units. The prestressed concrete GT units are designed to meet the required car park structural loading criteria without the need for the casting of any additional on-site reinforced structural concrete over their top surface, which gives a significant reduction in on-site activities and associated disruption, enabling following trades to progress more rapidly. Due to the car park deck being nonrectangular in plan and the development s principal anchor stores, adjacent to either side of the car park, having differing floor levels, all of the decks were required to fall in two directions. In certain areas, this required design development of the GT flooring units to enable them to be splayed, cast with a 25mm fall across their top surfaces and the use of solid GT units to support reinforced concrete cheese wedge -shaped units. The longest unit was 17.8m by 1.5m wide which included a splayed end, while the solid slabs weighed 22 tonnes. In certain areas, having a 25mm fall across the width of the GT unit was insufficient to provide the transitions required, which resulted in the bearing corbels of the supporting beams and walls also having to be stepped. Prior to production commencing, two full-scale mockups were prepared to prove the structural geometry and adequacy of the non-standard GT units and supporting beams. Compared to other off-site solutions of similar span, the GT floor units provide a reduced overall floor depth and structural dead load, which leads to a reduction in height and weight of the supporting precast concrete bearer beams, as well as a more efficient design of other structural frame components. Beams had protection fixed to them prior to being erected and with the tidy deck areas maintained during construction giving enhanced health and safety for off-site construction. The stepped corbel beams to accommodate falls and transitions were evaluated by a full-scale mock-up at the precast factory. 20 concrete
5 Complex ramp geometry showing the one-piece portal beam column arrangement used. Level 3 with high-quality factory brush finish to surface of precast concrete manufactured GT flooring units. The Avenue For the Avenue MSCP, a consistent highquality anti-slip brush finish was required for the surface of the car park floors. This was easily achieved with the GT units due to the high-quality control capabilities of factoryengineered concrete. For the adjoining retail section of shorter and varying spans a hybrid structural solution of precast columns, Delta beams, hollowcore units and in-situ concrete was chosen. Lift cores and the central stair core were formed using flat-pack walls due to the requirement of corbels to pick up the bearing of the adjacent floor units The two side stair cores were framed with precast columns and beams. A further interesting challenge for the PCE team was the design and delivery of the two curved and handed ramps on the external face of the car park adjacent to Bracknell s Millennium Way which form the up and down access between the floors. This ramp structure used precast reinforced concrete goalposts to enable the structural bearing of the precast floor slabs to avoid using separate column and beams. Perimeter beams were a combination of straight and curved in plan which spanned between the goalposts to support the prestressed concrete plate flooring for the straight sections. Normally reinforced concrete curved and sloping plates at the ends of the ramps were cast from moulds integral with those for the curved beams, ensuring accuracy of fit on-site. A reinforced structural topping across the plate flooring was also used. Accurate electronic detailing of the different components and close control of the casting accuracy of all the precast concrete units ensured that the ramps complex geometry was easily achieved. In total, over 3500 precast units were erected during the 40-week on-site programme. During the project, PCE further developed its electronic QA and paperless control systems to ensure that components were manufactured and delivered on a justin-time basis and easily erected to the quality expected and with a high regard to all aspects of health and safety. Nickie Brown, PCE managing director, says, The Avenue multistorey car park at Bracknell is an excellent example of a design-and-build off-site engineered hybrid concrete structure. We were able to use the latest electronic technology and intelligence, including BIM, to design and detail, share data between all the parties involved and provide control systems. All this has enabled the use of structural concrete to be the most viable and efficient construction material choice for this building. Client Architect Consultant engineer Quantity surveyor Main contractor Specialist hybrid structural frame contractor Bracknell Regeneration Partnership Chapman Taylor Arup Aecom Mace PCE concrete 21
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