View source for Sky campus car park, Osterley, London

==Article in [https://www.newsteelconstruction.com/wp/wp-content/uploads/digi/2016pdf/NSC1606digi.pdf#page=16 NSC June 2016]==
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'''Steel drives quick [[Car_parks|car park]] delivery'''<br>
Steel construction’s [[The_case_for_steel#Speed of construction|speed of delivery]] has recently come to the fore, as an 830-space [[Car_parks|multi-storey car park]] for media company Sky had its frame [[Construction#Steel erection|erected]] and flooring installed in just eight weeks.<br> 

Sky’s campus in Osterley, west London is undergoing a major expansion with [[Sky campus, Osterley, London|new office buildings]] and a new [[Car_parks|multi-storey car park]] both being constructed at the same time, albeit as separate contracts.

For the [[Car_parks|car park]], Bourne Parking was the main contractor and steelwork contractor, fulfilling both tasks on this fast programme. “Normally the build programme would be much longer, but the client wanted the [[Car_parks|car park]] as quickly as possible, so with four [[Construction#Mobile cranes|cranes]] working simultaneously for the [[Construction#Steel erection|steel erection]] we were able to achieve this fast programme,” explains Bourne Parking Senior Project Manager Greg Brown.

The [[Car_parks|car park]] measures 90m-long by 50m-wide and consists of seven levels, including ground floor and an open rooftop level. The structure is a steel [[Braced_frames|braced frame]] that supports [[Car_parks#Hollow core pre-cast units used compositely with the steel beams|precast flooring planks]], with steelwork [[Construction#Steel erection|erected]] around a 7.5m by 16m [[Concept_design#Floor grids|grid pattern]].

Prior to Bourne starting on site, the plot for the [[Car_parks|car park]] had already been cleared with an old office block demolished under a separate contract. Once the piling and the installation of ground beams had been completed, as well as the [[Construction|construction]] of two precast [[Concept_design#Concrete or steel cores|cores]], the [[Construction#Steel erection|steel erection]] programme was able to begin.
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“Using four [[Construction#Mobile cranes|mobile cranes]] was a challenge as the structure takes up the entire site’s footprint leaving no room for material storage,” adds Mr Brown. [[Construction#Steel erection|Erecting]] the structure to its full-height, as well as installing the [[Car_parks#Hollow core pre-cast units used compositely with the steel beams|flooring planks]], two [[Construction#Mobile cranes|cranes]] were used to [[Construction#Steel erection|erect]] the area incorporating the [[Car_parks|car park’s]] ramps as this had a higher degree of complexity and a higher piece count, while the rest the building was divided between the other two [[Construction#Mobile cranes|cranes]]. “Each [[Construction#Mobile cranes|crane]] served two MEWPs and in this way we were able to [[Construction#Steel erection|erect]] the entire structure quickly and without disrupting the surrounding road,” says Mr Brown. “Only the final few bays required a temporary road closure as we’d used up all of the site’s available space.”

[[Concept_design#Structural options for stability|Stability]] is derived from strategically positioned [[Braced_frames#Vertical bracing|cross bracing]], located in areas that don’t interfere with parking bays, and the [[Braced_frames#Horizontal diaphragms|diaphragm action]] derived from the grouted floor planks. Some additional [[Construction#Temporary works|temporary bracing]] was also necessary during the [[Construction#Steel erection|steel erection]] process.

“The [[Braced_frames|steel frame]] had to be extra rigid as it has to go around and incorporate two structurally independent precast buildings that are located on the ground floor,” adds Mr Brown. These two buildings consist of a substation for electric car charging, and an office and pump room.

Once the [[Braced_frames|steel frame]] had been completed, Bourne fitted out the [[Car_parks|car park]], work that included M&E, installation of lifts, and asphalting and waterproofing the upper level. The [[Car_parks|car park]] was then handed over to the client, on time and within a 30-week schedule. While it was in use the distinctive rainbow coloured [[Building_envelopes|cladding]] was installed. A team of abseilers undertook this work as they required less plant on site and consequently caused little or no disturbance to [[Car_parks|car park]] users.

{|class="wikitable" width="600" 
|-
|'''Architect'''||DRMM
|-
|'''Structural Engineer'''||Arup
|-
|'''Steelwork Contractor'''||Bourne Parking
|-
|'''Main Contractor'''||Bourne Parking (part of Bourne Construction Engineering)
|-
|'''Main Client'''||Sky
|}

[[Category:Case studies - Car parks]]