Robbers entered the strong room by cutting the
roof slab. Six lockers have been damaged.
The closed portion of the underpass has been constructed by top down construction technique; 93m x 27m
roof slab of the closed portion contains 42 nos of void forms embedded.
The four columns are pulled out beyond the outer edges of a rectangular building platform and articulated at the joints with the
roof slab which, in turn, is sculpted and made thin at its outer edges.
Working in close quarters -- and 20-feet above the
roof slab -- Rosenwach successfully welded the sections together, installed new shut-off valves and electrical controls.
With its spare, rational geometry and slender concrete
roof slab supported on regimented lines of columns, it also owed a clear debt to lberian Modernism.
The small building has a simple steel structure with a concrete
roof slab. Columns are set back from the perimeter and the double skin is stiffened by extruded aluminium wind-bracing posts.
As there are no intermediate floors within the central public area of the box to carry lateral loads, two rows of raking, aerofoil-shaped concrete columns 13m high act like trusses, supporting the
roof slab above.
For reasons of speed, economy and fire resistance, reinforced concrete was used for the structural frame which has a raked
roof slab and circular columns 514.