A framework of tubular trusses with canted supports rests on a solid mezzanine floor. Both are visible through the two-storey glazed facade of the 20 x 40m pumping station.
The structure was designed as a delicate filigree of steel tubes, which would clearly indicate the line of forces. It consists of four triangulated truss girders, each measuring 1.3m deep and spanning 20m, which support a steel/concrete composite roof. The paired top booms and bottom boom (168.3mm diameter CHSs) are connected by canted 114.3mm diameter CHS props.
The load from the roof is transferred to the trusses by 168.3mm diameter CHS compression members. These are coupled to the top and bottom chords of the trusses by 40mm diameter steel tension rods, creating a cantilever action on both sides of the truss.
Each truss is supported at its ends by two pairs of canted 193.7mm diameter CHS legs, which rest on floorplates alongside the glass facade. The plates also act as fixing points for a pair of vertical tension rods, which transfer loads from the top chords of the truss down to the concrete floor. The plates are positioned on concrete pockets to distribute the additional horizontal force component from the diagonal legs, through the concrete table and sheer walls, down to the concrete slab below ground. As some of the sheer walls did not match the position of the legs, loads were modelled on a computer program.
The roof consists of 180mm deep in-situ concrete cast on a profiled steel deck. At the perimeter, the roof is supported by a 300mm deep universal beam, which is bolted to the top booms of the trusses. To reduce the level of noise from the pumps, the roof and the facade are separated from the supporting structure by elastomeric anti-vibration bearings.