Segmented cold formed joist

a technology of joists and joints, applied in the field of joists, can solve the problems of increasing the cost of process, increasing the cost of production, and difficulty in achieving the effect of providing sheer bonding capacity between the joist and the concrete in the composite joist,

Inactive Publication Date: 2005-05-26
BEST JOIST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is generally difficult and costly to design steel and concrete composite floors using joists because legislation exists in various jurisdictions which relate to federal safety laws requiring that structural members cannot have objects extending above a structural floor member that will encumber the walking path of a worker.
Generally speaking the details for providing sheer bond capacity between the joist and the concrete in a composite joist are generally expensive to produce in the prior art.
However, the process has become more expensive due to environmental considerations when using dipped tanks containing volatile solvents.
The cold form technology presently has limitation in span lengths for floor and roof members to be widely used.
Unless cold form materials can be used in the thin applications, the use of these materials is cost prohibitive since hot-rolled pre-finished steel coil material typically used in forming comes in at much greater cost than th

Method used

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  • Segmented cold formed joist
  • Segmented cold formed joist
  • Segmented cold formed joist

Examples

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Embodiment Construction

[0066] In the description that follows, like parts are marked throughout the specification and the drawings with the same respective reference numbers. The drawings are not necessary to scale and in some instances proportions may have been exaggerated in order to more clearly depict certain features of the invention.

[0067]FIG. 1 illustrates a prior art open web joist construction 2 consisting of an upper chord assembly 4 spaced from a lower chord assembly 6. The chords are joined together by a zig zag web 8 which is generally connected to the upper and lower chord assembly 6 by a number of means including welding or the like.

[0068]FIG. 2 illustrates a prior art cold formed joist construction 10 having a web portion 12 having a plurality of holes 14 disposed there through for receiving utility such as wire or the like.

[0069]FIG. 3 illustrates one embodiment of the invention which comprises an assembled joist 20 having a first or upper chord member 22 spaced from a second or lower ...

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PUM

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Abstract

A joist comprised of at least one cold-formed elongated chord member; a cold-formed web having a plurality of web members and means for securing said web to said chord member.

Description

FIELD OF INVENTION [0001] This invention relates generally to a joist and particularly relates to floor and roof joists for building construction and more particularly to methods for producing concentric top chord bearing cold form joists for composite concrete and non-composite joist conditions for the construction industry. BACKGROUND OF INVENTION [0002] Joists are commonly used in the construction industry to span a distance and provide a surface for a floor, roof or the like. Joists can be comprised of a variety of materials including wood and metal. [0003] Metal or steel joists can be constructed in an open web configuration, which generally consists of spaced apart upper and lower chord members which extend longitudinally thereof and are fastened together by a zig-zag web. Such open web joists are typically manufactured by hot-roll structural sections namely the upper and lower chord members and the webs. The webs typically can be comprised of hot-rolled steel rods, which are ...

Claims

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Application Information

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IPC IPC(8): B21D47/01E04B5/29E04B5/40E04C3/02E04C3/04E04C3/07E04C3/08E04C3/09E04C3/11E04C3/293E04C3/294
CPCB21D47/01E04B5/29E04B5/40E04C3/065E04C3/07E04C3/083E04C2003/046E04C3/11E04C3/293E04C3/294E04C2003/026E04C2003/0413E04C2003/0452E04C3/09E04C3/291
Inventor STRICKLAND, MICHAELXU, LEI
Owner BEST JOIST
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