Time Square, Warrington
Main Client: Muse Developments
Architect: Leach Rhodes Walker
Main contractor: Vinci Construction
Structural engineer: Alan Johnston Partnership
Steelwork contractor: James Killelea
Steel tonnage: 3,000tWarrington is perhaps best known for its Rugby League team, the Wolves, one of the founding members of the Northern Rugby Football Union in 1895 and the only one that has played every subsequent season in the top flight.
However, the town has plans to become a retail and leisure destination, no mean feat when you consider the proximity of Liverpool and Manchester, both of which are only 20 miles away.
The town already has a major draw card in the shape of its award-winning market that dates back to medieval times, and which was recently voted the nation’s best small indoor market.
It is currently housed in a temporary building, erected so that the original structure could be demolished to make room for a brand new hall.
The new market hall forms one part of the new Time Square development, a £110M mixed-use scheme, which will eventually help Warrington Borough Council realise its plans to regenerate a large swathe of the town centre.
Overall, the Time Square development consists of four steel-framed buildings, a leisure block accommodating retail and restaurant outlets on the ground floor and a 13-screen cinema complex above, a four-storey 9,200m² council office, a two-storey retail block and the new 60m × 40m market hall.
Steelwork contractor James Killelea has erected 3,000t of steel for the project, a total which equates to more than 6,500 individual pieces. The upper floors have all been formed compositely, with steel beams supporting metal decking and a concrete topping.
The steel erection programme began with the leisure block, as main contractor Vinci Construction continued with site remediation on the remainder of the site.
The leisure block measures 95m × 55m and has a height of 28m. The ground floor, which will accommodate retail and restaurant units, is a double-height space with plenty of room for optional mezzanine levels.
A complex steel design has been utilised in the leisure block as the ground floor column pattern does not fit well with the upper level’s cinema.
The retail units are typically 10m-wide × 35m-deep clear spaces with no internal columns. To the rear of these units there is another column-free space accommodating a service yard, while numerous service areas and connecting corridors further limit the opportunity for column positions.
“Only about 30% of the columns in this building continue all the way up as the cinema requires a larger and more irregular column pattern to accommodate the 13-screens,” says Alan Johnston Partnership Partner John Murphy.
“Consequently, we have a series of 15m-long transfer beams, dividing the building at first floor cinema foyer level, that allow the upper floors to have different column positions.”
The cinema design incorporates a central spine of three floors to provide access and projection levels, while storey-high trusses have been used to transfer load to available support positions and limit beam depths where there is a restricted height.
The 13 screens vary in size, adding to the steelwork’s complexity, while each one had to be acoustically isolated.
A number of design measures were undertaken to make sure the screens were adequately isolated. The building is a large braced frame, gaining its stability from bracing located around lifts shafts and stair cores and in the roof. The latter bracing elements could not use hollow sections as these members are not suitable for acoustics.
Also, in the structure’s roof the purlins had to sit on half cleats to prevent sound travelling between the screens at this high level, while all of the building’s column splices have used countersunk bolts to create a flush surface to aid the installation of acoustic boards.
“We also formed joints in the concrete slabs beneath the acoustic walls to prevent sound traveling through the floors,” adds Mr Murphy.
Once the 1,600t of steelwork for the leisure block had been completed, the remediation and ground works had also been concluded and James Killelea’s erection team were able to move across the site and begin work on the offices, market hall and the small 61m × 18m retail block.
The four-storey office building is a skewed horseshoe shape in plan, with a centrally-positioned full-height atrium. It is approximately 72m-long and will offer 9,200m² of floorspace.
Using braced cores for its stability, the office has been designed for maximum internal column-free space and features 15m spans throughout.
All of these long spans have been formed with Westok cellular beams that also accommodate all of the building’s services within their depth.
A service yard sits below one area of the office, adjacent to the entrance of the basement level that covers the entire footprint of the adjacent market hall.
A 22.5m-long × 1.8m-deep plate girder forms the column-free space and supports four-storeys of office structure above. This one steel member represents the largest single steel element on the entire project.
A retained Victorian façade has been incorporated into the design of the new market hall, along its main Bridge Street elevation. The façade previously belonged to a Boots store and formerly accommodated a plaque remembering the tragic IRA bombings which occurred on the spot in March 1993. The plaque has been temporarily removed by Vinci and will be returned to its location once the scheme is complete.
The retained façade was temporarily supported by a scaffold system, which was systematically released once the connected market hall steel frame was completed.
The market hall measures 60m × 40m and features first floor mezzanine levels around two sides, while the central column-free area of the structure is formed by a series of 27m-long lattice trusses.
The roof trusses also support a feature roof light that will allow natural light to penetrate the inner parts of the hall.
This structure is a braced frame that makes use of Macalloy cross bracing, which will be left exposed within the completed building as architectural features.
Summing up, Vinci Construction Senior Project Manager Paul Turner says: “The whole scheme lends itself to steel construction as the leisure block has a very complex design and would have been difficult to build with any other material, while the office and market hall both have long spans, which are easier and quicker to construct with steel.”
In conclusion, Warrington Council Head of Development John Laverick says: “ The use of steel gives great confidence that the programme is going to be met, which is of critical importance in a commercial scheme such as this.”
Time Square is scheduled to open in early 2020.
Tagged acoustics, Alan Johnson Partnership, braced frame, cinema, column splices, column-free space, countersunk bolts, cross bracing, half cleats, James Killelea, Leisure, Metal decking, mezzanine levels, Offices, plate girders, purlins, regeneration, retail, retained facade, speed of erection, stability, steel braced cores, transfer beams, trusses, Vinci Construction, Warrington
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