E - Fixed Constructions – 04 – B
Patent
E - Fixed Constructions
04
B
20/6
E04B 1/343 (2006.01) E04B 1/32 (2006.01)
Patent
CA 1329971
ABSTRACT A segmented arch structure is prefabricated from compression units, the units generally comprising one or more standard arch segment elements, and end anchor elements. Each arch segment comprises a trapezoidal frame structure fabricated from short lengths of sawn lumber, and fastened at the corner junctions of the respective individual members to form the respective arch segment element, each element comprising a segment of the arch. The arch is assembled in combination with one or more elongated pre-stressing elements and the pre-stressing elements tensioned to a sufficient extent, relative to the geometry and applied load to be born by the arch, that, in combination with other inter-element fastening means the arch elements are maintained substantially under compression across the abutting segment end faces. The arch is generally pin jointed at its ends, and frequently at the centre thereof, to preclude the development of local bending moments at the base and apex of the arch. In the preferred element construction a set of centre-to-centre triangulation braces form an inner, diamond- brace construction, having a lateral brace thereacross. An alternative X-brace construction, usually combining therewith a lateral pair of struts to the centre points of the parallel frame members of the trapezoidal frame, can be used. This can facilitate relocation of the pre-stressing element from off the geometric centre line of the frame, if desired. Such shifting of the axis of compression may also be readily effected with K-form and with single side or double sided sheath bracing.
612013
Armstrong R. Craig
Quaile Allan T.
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