Hayes Buildings

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Overview

Location: Hayes, West London

Client: Ballymore Properties Ltd., P C Harrington Group

Division: Structural Systems —Post-Tensioning

Scope: Design & Install Post-Tensioning

Period: 2008

A different type of steel has sprouted from the ground of the old scrap yard at Hayes, in Middlesex. As an up and coming area, the site presented prime development land, being located adjacent to the Grand Union Canal and Hayes and Harlington Station, providing easy access in to London.

The scheme comprises of 7 blocks, of mainly residential units, with one block providing a hotel on the complex. The majority of the blocks spring 9 floors from a podium deck at level 1, with one rising to 10 floors. The mezzanine level provides parking for the residents and the hotel.

The initial scheme was designed as a post tensioned solution by Walsh Associates, typically utilising an 8.35m x 6m column grid. The final post-tensioned slab design was carried out by a combination of Structural Systems in the UK and SDS in Poland. The slab depths varied depending upon loadings and included 210mm slabs, 225mm for internal podium and the residential/hotel slabs, and 300mm slabs for the podium where there was externally located paving and planter boxes.

The average pour size of the scheme was 520m2 with typically 13 pours per floor for the residential areas, 12 pours for the mezzanine and 18 pours for the podium. The scheme totals 72,100m2 of post-tensioning.

Discussions with the frame contractor, PC Harrington resulted in minor changes to provide a faster and simpler construction process, which provided programming benefits. The post-tensioning was completed using Structural Systems fully bonded flat duct system.