Method of converting a roof frame and frame elements for performing this method

Claim 1

A method of converting a roof frame bearing the roofing of a construction having at least two gable walls and two facade walls, the frame being located between two gable walls and comprising a plurality of trusses spaced from one another and extending from one facade wall to another, on which walls the trusses bear, each truss comprising a horizontal tie-beam and two inclined principal rafters which are connected to one another by triangulation elements supporting the principal rafters in order to enable them to resist the bending stress to which they are subjected owing to the load of the roofing, the method comprising the following steps: (a) fixing a vertical channel between each of the principal rafters and the tie-beam of at least a plurality of the trusses; (b) bringing into the roof and engaging in the channels, beams which have previously been divided into a plurality of sections, the ends of the beams bearing on the gable walls; (c) connecting the sections of each beam together by connection means; (d) securing a king post below each of the said connection means; (e) engaging the base of each king post with two ties whose other ends are connected at least indirectly to the ends of the beam sections located either side of the king post in question, and (f) stressing the ties so that, owing to their reaction on the king posts with which they form triangulations, they support the beams, which themselves support the principal rafters and the roofing at least indirectly, thereby enabling the initial triangulation of the trusses to be removed and subsequently the roof to be fitted out.

Claim 2

A method of converting a roof frame bearing the roofing of a construction having at least two gable walls and two facade walls, the frame being located between two gable walls and comprising a plurality of trusses spaced from one another and extending from one facade wall to another, on which walls the trusses bear, each truss comprising a horizontal tie-beam and two inclined principal rafters which are connected to one another by triangulation elements supporting the principal rafters in order to enable them to resist the bending stress to which they are subjected owing to the load of the roofing, the method comprising the following steps: (a) fixing a vertical channel between each of the principal rafters and the tie-beam of at least a plurality of the trusses; (b) bringing into the roof and engaging in the channels, beams which have previously been divided into a plurality of sections, the ends of the beams bearing on the gable walls; (c) connecting the sections of each beam together by connection means; (d) securing a king post below each of the said connection means; (e) engaging the base of each king post with two ties whose other ends are connected at least indirectly to the ends of the beam sections located either side of the king post in question, and (f) stressing the ties so that, owing to their reaction on the king posts with which they form triangulations, they support the beams, which themselves support the principal rafters and the roofing at least indirectly, thereby enabling the initial triangulation of the trusses to be removed and subsequently the roof to be fitted out.