MEMBRANE-FRAMEWORK STRUCTURE Russian patent published in 1997 - IPC

FIELD: construction engineering. SUBSTANCE: this can be used in erection of agricultural buildings with spans of 9-24 m. Erection implies effective pulling of shell on supporting contour due to arches installed at incline on pivoted supporting components and due to use of turnbuckles which fasten shell to supporting contour. Shell is easy in cutting out. Internal premise is airtight. Rational distribution of internal forces makes this structure economical. This idea represents basis for entire class of new arch-membrane systems in which shell for example is made of thin stainless sheet steel. Strength of membrane in such prestressed systems ensures their increased spacious stiffness. Structure has rigid supporting contour located over its perimeter. End and vertical intermediate arches of annular outline and similar span are located in plan over two parallel lines connected at ends by symmetrical arcs of circumference. They rest on supporting contour. Pivoted supporting components are installed under end arches. Membrane shell of structure rests on arches. Shell is made up of sheets and is fastened to supporting contour by turnbuckles. Pressure fan with air duct delivers air into shell space. Sensor of air pressure under shell allows for regulation of air pressure mode of operation within structure. Supporting contour is made in the form of rigid airtight tube. Intermediate arches are rigidly fastened to supporting contour. End arches are inclined to ends at angle of 45-60 deg. to vertical. Membrane shell which is made of one middle and two end sheets hermetically fastened with end arches over entire length of arches is preliminarily stretched along and across this structure by means of turnbuckles. Structure is provided with stress sensors in arches which automatically actuate air-supporting mode of operating structure when external loads exceed preset values. EFFECT: high efficiency. 1 tbl, 3 dwg