CA2683197A1

CA2683197A1 - Purlin bracing system for metal building roof

Info

Publication number: CA2683197A1
Application number: CA2683197A
Authority: CA
Inventors: Clifford M. Robinson; Russell C. Burnham
Original assignee: Individual
Current assignee: Butler Manufacturing Co
Priority date: 2007-05-17
Filing date: 2008-05-19
Publication date: 2008-11-27
Anticipated expiration: 2028-05-19
Also published as: US20080282635A1; WO2008144663A1; CA2683197C; CN101952523B; US7752823B2; MX2009012328A; CN101952523A

Abstract

A purlin bracing system for metal building roof includes braces which have pairs of tabs extending from one end. A brace is arranged perpendicular to a purlins, and its tabs are inserted through slots in the central web of the purlin. Another brace is then applied on the opposite side of the purlin, and headed pin is dropped through aligned holes in the tabs to secure them on opposite side of the purlin's central web. No tools or special fasteners are required.

Claims

1. In a metal building roof comprising a plurality of substantially parallel purlins extending in a first direction, the purlins having a center web and being supported at intervals by structural building frame members, and a plurality of braces extending in a second direction, substantially perpendicular to the first direction, between neighboring purlins to prevent lateral deflection and twisting of the purlins under load, the improvement wherein at least some of said braces are channel members having a central web and upper and lower flanges, the flanges extending lengthwise beyond the central web at a first end of the brace to form a pair of protruding tabs, the purlins have pairs of slots at intervals so that the tabs of a brace can be inserted through a pair of the slots and protrude on the other side of the purlin, the brace has holes in its tabs at its first end, and holes in its upper and lower flanges at its second end, the holes of the tabs and the holes of the flanges being disposed so that they are aligned when the respective members are abutted firmly against the purlin web on opposite sides thereof, whereby the tabs of one brace may be inserted through the slots in the purlin web from one side of the and another brace may be applied from the opposite side so as to overlap the tabs, and a plurality of pins, each of which may be inserted through the aligned holes of the first and second braces to interconnect them astride the purlin.

2. The roof of claim 1, wherein each of the purlins is substantially a Z-section member having a central web extending substantially perpendicular to the surface of the roof.

3. The roof of claim 1, wherein each pair of slots is spaced widthwise of the purlin web so that the braces are oriented, when installed, with their central webs substantially parallel to the roof surface.

4. The roof of claim 1, wherein the height of the brace is at least half the height of the purlin.

5. A lateral bracing system for a roof having an array of substantially parallel purlins, said system comprising a plurality of braces and a plurality of pins for interconnecting said braces, each of said braces being a channel member having upper and lower flanges connected by a central web, a portion of said web at one end of each brace being removed so that the ends of the upper and lower flanges at that end of the member form a pair of tabs, said tabs at one end of the brace and said upper and lower flanges at the other end of the brace having aligned holes through which said pins are passed to secure the braces together.

6. A method of laterally bracing an array of parallel purlins in a roof construction, said method comprising steps of forming pairs of apertures in said purlins at intervals, forming a brace from a channel member having upper and lower flanges connected by a central web by removing a portion of said web at one end of the member so that the ends of the upper and lower flanges at that end of the member form a pair of tabs, forming holes in said tabs and in the upper and lower flanges at the other end of the member, inserting said tabs from one side of the purlin through a respective pair of holes in the purlin so that the tabs extend to the other side of the purlin, overlapping said tabs with the upper and lower flanges of the untabbed end of a second similar brace, and then placing a heading pin through aligned holes in said tabs and flanges to secure the two braces together astride the purlin.

7. In a metal building roof comprising a plurality of substantially parallel purlins extending in a first direction, the purlins being supported at intervals by structural building frame members, and a plurality of braces extending in a second direction, substantially perpendicular to the first direction, between neighboring purlins to prevent lateral deflection and twisting of the purlins under load, the improvement wherein each said brace has a tab at one end thereof, the purlins have at intervals slots sized to receive said tab, so that the tab of a brace can be inserted through one of the slots and protrude on the other side of the purlin, the brace has a hole in said tab, and a hole in its second end, the hole in the tab and the hole in the second end being disposed so that they are aligned when the respective members are abutted firmly against the purlin web on opposite sides thereof, whereby the tab of one brace may be inserted through the purlin from one side and another brace may be applied from the opposite side so as to overlap the tab, and further comprising a pin which may be inserted through the aligned holes of the first and second braces to interconnect said braces.

8