Self-aligning, double wire corner bead for fireproofing structural steel member and method of using same

Abstract

A self-aligning, double wire corner bead for fireproofing structural steel along a plurality of surfaces, the corner bead having a single strip of welded wire fabric cut to a predetermined width for the fireproofing thickness and bent along a plurality of longitudinally extending lines, to provide a profile having a plurality of dihedral angles is disclosed. A nose is installed along two edges. A method of finishing the corners for fireproofing of structural steel member using an improved corner bead includes the step of attaching the corner bead through a lath to the structural steel member utilizing fasteners. The mesh of the corner bead provides a dam to form a roughened surface on the first application of fireproofing material until it hardens.

Claims

1. A method for fireproofing a member comprising a set of surfaces, with a fireproofing material, the method comprising the steps of: attaching a corner bead to a subset of the set of surfaces, the corner bead comprising: a welded wire fabric; a set of bends integrally formed in the welded wire fabric; a first wing defined by the set of bends; a single wire membrane defined by the set of bends, adjacent to the first wing; a double wire membrane defined by the set of bends, adjacent to the single wire membrane; a second wing defined by the set of bends, adjacent to the double wire membrane; a plurality of generally planar surfaces defined by the first wing and the second wing; and, the welded wire fabric only fastened to the member at a fastening position on the double wire membrane; a first angle between the first wing and the single wire membrane; a second angle between the single wire membrane and the double wire membrane; a third angle between the double wire membrane and the second wing; determining a thickness of the fireproofing material based on the first angle; and, applying the fireproofing material to the member and the corner bead according the thickness.

2. The method of claim 1, wherein the step of determining a thickness of the fireproofing material based on the first angle further comprises the step of adjusting the first angle.

3. The method of claim 1, further comprising the steps of: positioning a set of lath between the corner bead and the subset of the set of surfaces; and, attaching the corner bead to the subset of the set of surfaces through the set of lath.

4. A method for fireproofing a member comprising a set of surfaces, with a fireproofing material, the method comprising the steps of: attaching a corner bead to a subset of the set of surfaces, the corner bead comprising: a welded wire fabric; a set of bends integrally formed in the welded wire fabric; a first wing defined by the set of bends; a single wire membrane defined by the set of bends, adjacent to the first wing; a double wire membrane defined by the set of bends, adjacent to the single wire membrane; a second wing defined by the set of bends, adjacent to the double wire membrane; a plurality of generally planar surfaces defined by the first wing and the second wing; and, the welded wire fabric only fastened to the member at a fastening position on the double wire membrane; a first angle between the first wing and the single wire membrane; a second angle between the single wire membrane and the double wire membrane; a third angle between the double wire membrane and the second wing; determining a thickness of the fireproofing material based on the third angle; and, applying the fireproofing material to the member and the corner bead according the thickness.

5. The method of claim 4, wherein the step of determining a thickness of the fireproofing material based on the third angle further comprises the step of adjusting the third angle.

6. The method of claim 4, further comprising the steps of: positioning a set of lath between the corner bead and the subset of the set of surfaces; and, attaching the corner bead to the subset of the set of surfaces through the set of lath.

7. A method for fireproofing a member comprising a set of surfaces, with a fireproofing material, the method comprising the steps of: attaching a corner bead to a subset of the set of surfaces, the corner bead comprising: a welded wire fabric; a set of bends integrally formed in the welded wire fabric; a first wing defined by the set of bends; a single wire membrane defined by the set of bends, adjacent to the first wing; a double wire membrane defined by the set of bends, adjacent to the single wire membrane; a second wing defined by the set of bends, adjacent to the double wire membrane; a plurality of generally planar surfaces defined by the first wing and the second wing; and, the welded wire fabric only fastened to the member at a fastening position on the double wire membrane; a first angle between the first wing and the single wire membrane; a second angle between the single wire membrane and the double wire membrane; a third angle between the double wire membrane and the second wing; determining a thickness of the fireproofing material based on the first angle and the third angle; and, applying the fireproofing material to the member and the corner bead according the thickness.

8. The method of claim 7, wherein the step of determining a thickness of the fireproofing material based on the first angle and the third angle further comprises the step of adjusting the first angle.

9. The method of claim 7, wherein the step of determining a thickness of the fireproofing material based on the first angle and the third angle further comprises the step of adjusting the third angle.

10. The method of claim 7, wherein the step of determining a thickness of the fireproofing material based on the first angle and the third angle further comprises the steps of: adjusting the first angle; and, adjusting the third angle.

11. The method of claim 7, further comprising the steps of: positioning a set of lath between the corner bead and the subset of the set of surfaces; and, attaching the corner bead to the subset of the set of surfaces through the set of lath.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) FIG. 1 is a perspective view of a small section of a corner bead according to the prior art.

(2) FIG. 2 is a cross-sectional schematic view of a fireproofing structure utilizing a prior art corner bead installed according to a contour method.

(3) FIG. 3 is a perspective view of an exemplary small section of the corner bead of the present invention bent along a longitudinal axis and manufactured according to an embodiment of the present invention.

(4) FIG. 4 is an enlarged cross-sectional schematic view of the self-aligning, double wire corner bead of the present invention.

(5) FIG. 5 is a cross-sectional schematic view of a fireproofing structure utilizing a self-aligning, double wire corner bead of the present invention according to the contour method.

DETAILED DESCRIPTION

(6) Referring to FIG. 3, corner bead 10 includes a plurality of longitudinal ribs 16 arranged substantially parallel with respect to a plurality of longitudinal axes, including longitudinal axis A and to each other, and a plurality of transverse ribs 18 distributed between and extending substantially perpendicular to the plurality of longitudinal axes and the plurality of longitudinal ribs 16. A set of void areas 20 is defined by the plurality of longitudinal ribs 16 and the plurality of transverse ribs 18, such that each void area 20 is bounded by at least two longitudinal ribs 16 and at least two transverse ribs 18. A section of corner bead 10 includes a single strip of welded wire fabric cut to a predetermined length L and a predetermined width W. The predetermined length L and the predetermined width W correspond to a predetermined fireproofing thickness.

(7) In a preferred embodiment, corner bead 10 is made of a suitable metal, such as 16 gauge wire. Other suitable materials known in the art may be employed, including suitable plastics. In a preferred embodiment, corner bead 10 is a double welded wire fabric.

(8) In a preferred embodiment, corner bead 10 has a set of bends integrally formed in corner bead 10 along the plurality of longitudinal axes. Any number of bends may be employed. Longitudinal axis A defines first wing 12 and single wire membrane 11. First wing 12 and single wire membrane 11 form angle .sub.1 of approximately greater than 90 degrees, but less than approximately 180 degrees as further illustrated in FIGS. 4 and 5. A set of edges of first wing 12 defines a substrate to which nose 14 is attached. Nose 14, first wing 12, and second wing 12 (shown in FIG. 5) provide a rigid edge having a dam-like function, as will be further described below.

(9) In a preferred embodiment, nose 14 is made of a suitable plastic, such as polyvinyl chloride. Other suitable materials known in the art may be employed.

(10) Referring to FIG. 4, corner bead 10 is bent along a plurality of longitudinal lines 41, 42, 43, and 44, to provide a substantially continuous profile having a plurality of dihedral angles. Longitudinal line 44 defines first wing 12 and single wire membrane 11 extending laterally therefrom at angle .sub.1. Angle .sub.1 is approximately greater than 90 degrees, but less than approximately 180 degrees. Each of noses 14 is attached to first wing 12 and second wing 12. Longitudinal line 42 defines single wire membrane 11 and leg 31 of double wire membrane 30 extending from single wire membrane 11 in a continuous manner. Single wire membrane 11 and leg 31 are separated by angle . Angle is approximately 90 degrees. Longitudinal line 43 defines leg 31 of double wire membrane 30 and leg 31 of double wire membrane 30. Leg 31 is positioned substantially parallel to leg 31. Leg 31 substantially overlaps leg 31. Longitudinal line 41 defines second wing 12 and leg 31 of double wire membrane 30. Leg 31 extends away from second wing 12 at angle .sub.2. Angle .sub.2 is approximately greater than 90 degrees, but less than approximately 180 degrees.

(11) In use, the improved, self-aligning, double wire corner bead 10 of the present disclosure is utilized in a contour-like manner, surrounding a structural steel member with fireproofing material. Referring to FIG. 5, single wire membrane 11 is secured to structural steel member 24. First wing 12 is configured to establish a desired thickness of fireproofing material 22 along two surfaces of the structural steel member by providing a rigid screed edge to which nose 14 is attached. Double wire membrane 30 is secured to structural steel member 24, as will be further described below. Fireproofing material 22 surrounds the dimensions of the structural steel member 24 in a contour-like manner, tracing structural steel member 24 in all dimensions. The single strip of corner bead 10 allows uniform distribution of fireproofing material 22 along three surfaces, surfaces S.sub.1, S.sub.2, and S.sub.3.

(12) Referring to FIGS. 4 and 5, the width of the wings 12 and 12 determines distances D.sub.1, D.sub.2, and D.sub.3, and defines generally planar surfaces S.sub.1, S.sub.2, and S.sub.3 forming a set of corners of fireproofing material 22 distributed around structural steel member 24. Similarly, any of distances D.sub.1, D.sub.2, and D.sub.3 are optionally altered by changing angles .sub.1 and .sub.2. Angles .sub.1 and .sub.2 are substantially equal and measure approximately greater than 90 degrees, but less than 180 degrees. Angle measures approximately 90 degrees. For example, the smaller (less obtuse) angle .sub.1 is between first wing 12 and the single wire membrane 11 the longer distance D.sub.1 is between lath 26 and surface S.sub.1, and the shorter distance D.sub.3 is between lath 26 and surface S.sub.2. Similarly, the less obtuse angle .sub.2 is between second wing 12 and leg 31 of double wire membrane 30, the longer distance D.sub.2 is and the shorter distance D.sub.1 is making distributed fireproofing material 22 thicker along surface S.sub.3 in relation to a thinner strip of fireproofing material 22 along surface S.sub.1.

(13) In a preferred embodiment, the determination of angles .sub.1 and .sub.2 should be such that a uniform thickness of fireproofing material 22 along surface S.sub.1 is achieved.

(14) In one embodiment, lath 26 is distributed around structural steel member 24. Single wire membrane 11 is attached through lath 26 into structural steel member 24 by pneumatic fastener 28 at a single fastening position on single wire membrane 11. Other joining or attaching means known in the art, such as welded pins or screws, may be employed.

(15) In another embodiment, each of single wire membrane 11 and double wire membrane 30 is attached to structural steel member 24 by pneumatic fastener 28 at a single fastening position on double wire membrane 30.

(16) In another embodiment, leg 31 and leg 31 of double wire membrane 30 are attached through lath 26 into structural steel member 24 by pneumatic fastener 28 at a single fastening position on double wire membrane 30. Other joining or attaching means known in the art, such as welded pins or screws, may be employed. According to one embodiment of the present invention, lath 26 is optionally distributed along the entire perimeter of structural steel member 24 to be fireproofed (not shown). In another embodiment, lath 26 is distributed along a portion of the perimeter of structural steel member 24.

(17) In other embodiments, any number of fastening positions and locations may be employed.

(18) The width of first wing 12 and second wing 12 along with nose 14 attached to the outer edges of both wings serves as a dam during the process of fireproofing. Fireproofing material 22 is then sprayed onto lath 26 and screened off using the location of nose 14 to determine the finished thickness of fireproofing material 22.

(19) Referring to FIG. 5, in a shop application, i.e., fireproofing material 22 is applied to structural steel member 24 in a pre-fabrication facility, the cementitious composition is sprayed or poured one layer at a time on a surface of lath 26 positioned horizontally. Structural steel member 24 is then rotated 90 degrees and the adjacent surfaces are positioned horizontally to allow easy application of fireproofing material 22. With this process in place, each successive spraying is performed which allows hardening of fireproofing material 22 before the next rotation of structural steel member 24. As can be seen, the dam-like functionality of corner bead 10 according to one embodiment of the present invention is critical as it provides an appropriate keying surface to bond the subsequent layers of fireproofing material 22. Each structural steel member 24 is turned to uniformly apply the cementitious material to all surfaces.

(20) It will be appreciated by those skilled in the art that any type of member may be employed.

(21) In a field application on a job site, structural steel members 24 are erected into a structure prior to fireproofing, and all surfaces of structural steel member 24 may be sprayed or troweled onto the surface of lath 26 at the same time (not shown).

(22) It will be appreciated that the invention is not restricted to the particular embodiment that has been described, and that variations may be made therein without departing from the scope of the invention as defined in the appended claims, as interpreted in accordance with principles of prevailing law, including the doctrine of equivalents or any other principle that enlarges the enforceable scope of a claim beyond its literal scope. Unless the context indicates otherwise, a reference in a claim to the number of instances of an element, be it a reference to one instance or greater than one instance, requires at least the stated number of instances of the element, but is not intended to exclude from the scope of the claim a structure or method having more instances of that element than stated. The word comprise or a derivative thereof, when used in a claim, is used in a nonexclusive sense that is not intended to exclude the presence of other elements or steps in acclaimed structure or method.