(57) Method of pre-stressing two spaced components (2,10), such as a structural steel
member (2) and a flat roof panel (10), wherein an expandable element (20'), preferably
in the form of an inflatable tube of given length, is inserted in the space between
the two components (2,10) and is expanded to generate a force acting between the two
components (2,10), to pre-stress at least one of the components (2,10). Once the two
components (2,10) have been pre-stressed, rigid spacing means (6) may be placed in
at least part of the remainder of the space not occupied by the non-expanded element
(20') and in engagement with both components (2,10). An inflatable tube (20) may be
used as the expandable element (20') and may have its opposed ends (21) sealed in
a fluid-tight manner by folding and clamping (22).
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