CN110847400A

CN110847400A - Method for fireproofing a member comprising a set of surfaces with a fireproofing material

Info

Publication number: CN110847400A
Application number: CN201911201497.2A
Authority: CN
Inventors: P·G·米勒
Original assignee: P GMile
Current assignee: P GMile
Priority date: 2014-08-21
Filing date: 2015-08-21
Publication date: 2020-02-28
Also published as: CN107075854A; MX2017002330A; AU2015305322B2; PH12017500321A1; AU2015305322A1; PH12017500321B1; CN107075854B; SA517380934B1; CA2958583A1; WO2016029154A1

Abstract

A method of fireproofing a member comprising a set of surfaces with a fireproofing material is disclosed. A self-aligning dual net corner bead for fire blocking structural steel along a plurality of surfaces, the corner bead having a single strip of welded wire mesh cut to a predetermined width according to fire blocking thickness and bent along a plurality of longitudinally extending lines to provide a profile having a plurality of dihedral angles. Nose ends are mounted along both edges. A method of finishing a corner bead for fire-blocking a steel structural member using an improved corner bead includes the step of attaching the corner bead to the steel structural member through a lath using a fastener. The grid of corner beads provides a barrier to form a rough surface on the first coating of fire-blocking material until it hardens.

Description

Method for fireproofing a member comprising a set of surfaces with a fireproofing material

This application is a divisional application of the invention patent application entitled "self-aligned dual-net corner bead for fire-protecting steel structural members and use thereof", filed on day 2015, 8, 21, application No. 201580050970.5.

Technical Field

The present invention relates generally to corner beads for cementitious fire protection treatment of steel structural members, and more particularly to a device that is self-aligning during installation and allows for accurate metering of the thickness of fire-blocking material along three surfaces.

Background

In the field of corner beads for fire protection treatment of structural steel, previous methods have generally included V-bend corner beads with adjustable side edges (flanges). The corner protecting strip is mostly used in plastering and whitewashing industries. The corner bead used previously was made from wire mesh welded into a V-section grid as shown in figure 1.

In installation, the longitudinal bottom mesh of the V-shaped corner bead is attached to the metal lath or the metal mesh grid with a binding wire mesh, and further to the steel member to be fire-proofed, as shown in fig. 2. This allows, at best, the distribution of the fireproofing material along both surfaces, after a compromise between the correct height of the two flanges; i.e. to achieve the correct fire thickness, the correct apex height must be determined by narrowing or enlarging the distance between the side edges (flanges) of the corner bead defined by the apex. With this technique, the corner bead is difficult to align with the adjacent surface and the installation of the corner bead for fire-protecting structural steel requires great skill.

The prior art suffers from a number of problems including difficulty in properly adjusting the conventional corner bead to the adjacent surface, uneven application of fire retardant material, and lack of a barrier for wet cementitious material. Despite these known and long-standing problems and the apparent market need for solutions, the prior art does not disclose or suggest a viable, cost-effective solution to the above-mentioned problems of the prior art.

There is therefore a need for an improved corner bead to avoid inaccuracies in gauging the thickness of the fire-blocking material and to allow easy installation along three surfaces. An improved self-aligning dual net corner bead is inexpensive to manufacture and easy to install.

Disclosure of Invention

The present invention provides a self-aligning dual-net corner bead strip that allows the manufacture of a corner bead of fire-blocking material having a uniform thickness around a steel structural member in an accurate and rapid manner. This is accomplished by bending a single strip of welded wire mesh of predetermined width along a plurality of longitudinally extending lines (axes) to form the outline of a metal sheet having a plurality of dihedral angles, two wing panels of desired width, a single web panel and a double web panel including a first side edge and a second side edge, as generally shown in fig. 4 and 5.

The angle at which each wing of the device meets the second side edges of the single and double diaphragms, respectively, determines the thickness of the fire-retardant material distributed around the steel structural member along the three surfaces. Furthermore, the thickness may be varied by varying the width of each wing. Uniformity of the thickness of the fire-blocking material distributed around the three surfaces of the steel structural member is achieved by bending the first and second wing panels to substantially the same angle relative to the second side edges of the single and double membrane panels, respectively. In profile coating, uniformity of the thickness of the fire-blocking material distributed around all surfaces of the steel structural member is achieved by using a single metal strip of the same width bent for all the corners of the steel structural member to produce the same single metal sheet profile.

It is another object of the present invention to provide an improved corner bead for fire protecting structural steel without the need for adjusting the side edges.

Another object of the invention is to provide a new device for mounting a corner bead with a simpler attachment device with structural steel.

Another object of the present invention is to provide an improved technique for coating fire-resistant material along three surfaces in a precise thickness under any working conditions in which the fire-resistant treatment of the structural steel is carried out.

It is another object of the present invention to provide a barrier for forming a rough surface on the first coating of fire-protecting material until it hardens along three surfaces.

While meeting these and other related objectives, the present invention provides an improved self-aligning dual-net corner bead for fire-protecting structural steel that is highly competitive from an economic standpoint only. The corner bead of the present invention comprises a single strip of welded wire mesh cut to a desired width according to fire thickness and bent along a plurality of longitudinal axes to form a set of wing panels, a single web plate and a double web plate, the double web plate having a first side and a second side, the first side seamlessly transitioning to the second side by the bending process of the double web plate such that the first side is substantially parallel to the second side, and the single web plate and the double web plate are attached by attachment means to panels distributed around a steel structural member.

According to the present invention, the corner bead comprises a single elongated welded wire mesh of a predetermined width, said single welded wire mesh comprising a set of flexible grid strips, as shown in fig. 3.

According to one embodiment of the present invention, the improved two-wire corner bead allows each element of the curved wire mesh of the corner bead to perform a different function necessary to successfully complete the fire-protection treatment process along three surfaces.

The single and double mesh plates provide the flat portion of the mesh through which pneumatic or screw fasteners attach the mesh to the appropriate location on the structural steel. In addition, the double mesh sheet provides additional support for the two flanges at opposite corners of the steel structural member, thus facilitating a single piece of wire mesh to cover both corners and three surfaces of the structure. This simple application enables the automatic alignment of the corner bead along three surfaces, eliminating the cumbersome process of reducing or enlarging the distance between the sides of conventional corner beads, and in the contour coating of fire-blocking materials, only one metal strip of the required width needs to be provided in order to allow the simultaneous fire-blocking of two corners of a steel structural component along three surfaces.

By providing a rigid scraper edge along the nose, the width of the set of wings and/or the angle at which the first and second wings intersect the second side edges of the single and double webs, respectively, determines the thickness of the fire-blocking material distributed along the three surfaces. Thus, a suitable amount of fire-blocking material is distributed around the corner bead, resulting in a flat coating over the entire surface.

The width of the set of flaps also provides a barrier, forming a rough surface on the first coating of fire-blocking material until the fire-blocking material hardens. This formation allows the cementitious material to be continuously applied to adjacent surfaces.

In another aspect, the invention comprises a method of making an improved self-aligning dual-wire corner bead for fire-protecting structural steel, the bead comprising a single welded wire mesh cut to a desired width according to fire-protecting thickness and bent along a plurality of longitudinally extending lines (axes) to form a sheet metal profile, a first longitudinal line defining a first wing panel and a single-wire membrane panel extending transversely therefrom at a first angle of about greater than 90 ° but less than about 180 ° to one another, wherein the single-wire membrane panel is secured to a steel structural member, the first wing panel is configured to form a desired thickness of fire-protecting material along both surfaces by providing a rigid scraper along a nose end, a second longitudinal line defining the single-wire membrane panel and a dual-wire membrane panel extending in a continuous manner from the single-wire membrane panel and at a second angle of about 90 ° to one another, a third longitudinal line defining the first side edge of the dual-wire membrane panel and a second side edge of the dual-wire membrane panel, such that the first side edge is positioned substantially parallel to the second side edge (second side edge substantially overlapping first side edge), and wherein the double web is fastened to the steel structure, and a fourth longitudinal line defines a second wing panel and the second side edge of the double web, the second side edge extending downwardly from the second wing panel at a third angle greater than about 90 ° but less than about 180 ° from each other, and wherein the third angle is substantially equal to the first angle.

In yet another aspect, the invention includes a method of finishing a set of cementitious fire protection corners in the coating of the contours of a set of steel structural members, the method comprising the steps of: selecting a corner bead comprising a single strip of welded wire mesh cut to a suitable width according to fire-rated thickness and bent along a plurality of longitudinally extending lines to form a profile having a plurality of dihedral angles, wherein a first longitudinal line defines a first wing panel and a single-web panel extending transversely therefrom at a first angle of about 90 ° to each other but less than about 180 °, wherein the single-web panel is fastened to a steel structural member, the first wing panel is arranged to form a desired thickness of fire-rated material along both surfaces by providing a rigid flight along a nose end, a second longitudinal line defines a first side edge of the single-web panel and a double-web panel extending from the single-web panel in a continuous manner and at a second angle of about 90 ° to each other, and a third longitudinal line defines the first side edge of the double-web panel and a second side edge of the double-web panel, such that the second side edge is positioned from the first side edge of the double-web panel so as to be substantially parallel to the first side edge (second side edge) A side edge substantially overlapping a first side edge), and wherein the double web is fastened to the steel structure, and a fourth longitudinal line defines a second wing panel and the second side edge of the double web, the second side edge extending downward from the second wing panel at a third angle greater than about 90 ° but less than about 180 ° from each other, and wherein the third angle is substantially equal to the first angle.

A dihedral corner (also referred to as a face corner) is an interior corner where two adjacent faces of each component of the dual web corner bead are bounded by two interior faces, such as corner α 1 formed between adjacent faces of the first wing panel and the single web panel, corner α 2 formed between adjacent faces of the second wing panel and the second side edge of the dual web panel, and corner β formed between adjacent faces of the first side edge of the single web panel and the dual web panel, the fourth corner formed along the third longitudinal line between the first and second side edges of the dual web panel is substantially zero (0) degrees so that the first side edge and the second side edge substantially overlap each other and are substantially parallel to each other.

Drawings

Fig. 1 is a perspective view of a short section of a corner bead according to the prior art.

Fig. 2 is a schematic cross-sectional view of a fire protection structure using a prior art corner bead installed according to the contour method.

Fig. 3 is a perspective view of an exemplary short segment of the corner bead of the present invention manufactured according to one embodiment of the present invention and bent along a longitudinal axis.

Fig. 4 is an enlarged cross-sectional schematic view of the self-aligning two-wire corner bead of the present invention.

Figure 5 is a schematic cross-sectional view of a fire stopping structure using the self-aligning two-wire corner bead of the present invention installed according to the contour method.

Detailed Description

Referring to fig. 3, the corner bead 10 includes a plurality of longitudinal ribs 16 arranged substantially parallel to each other and parallel to each other with respect to a plurality of longitudinal axes including the longitudinal axis a, and a plurality of transverse ribs 18 distributed between the plurality of longitudinal axes and the plurality of longitudinal ribs 16 and extending substantially perpendicular to the plurality of longitudinal axes and the plurality of longitudinal ribs 16. A set of void regions 20 is defined by the plurality of longitudinal ribs 16 and the plurality of transverse ribs 18 such that each void region 20 is bounded by at least two longitudinal ribs 16 and at least two transverse ribs 18. A length of corner bead 10 comprises a single welded wire mesh cut to a predetermined length L and a predetermined width W. The predetermined length L and the predetermined width W correspond to a predetermined fire-blocking thickness.

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

In a preferred embodiment, the corner bead 10 has a set of bends integrally formed in the corner bead 10 along the plurality of longitudinal axes. Any number of bends may be used. As further shown in fig. 4 and 5, the longitudinal axis a defines a first wing panel 12 and a single web panel 11. The first wing panel 12 and the single web panel 11 form an angle greater than about 90 deg. but less than about 180 deg.. A set of edges of the first wing 12 define a base plate to which the nose 14 is attached. Nose 14, first wing 12, and second wing 12' (shown in fig. 5) provide a rigid edge that functions like a barrier, as will be described further below.

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

Referring to FIG. 4, the sheathCorner strip 10 is curved along a plurality of longitudinal lines 41, 42, 43, and 44 to provide a substantially continuous profile having a plurality of dihedral corners, longitudinal line 44 defines first wing panel 12 and is angled α therefrom₁Single web sheet 11 extending in cross machine direction angle α₁Greater than about 90, but less than about 180, the nose end 14 is attached to the first and second wing panels 12 and 12', respectively, the longitudinal line 42 defines a side edge 31 of the single and double webs 11 and 30 extending from the single web 11 in a continuous manner, the single and side edges 11 and 31 are separated by an angle β, the angle β is about 90, the longitudinal line 43 defines a side edge 31 of the double web 30 and a side edge 31' of the double web 30, the side edge 31 'is positioned substantially parallel to the side edge 31, the side edge 31' substantially overlaps the side edge 31, the longitudinal line 41 defines a side edge 31 'of the second wing panel 12' and the double web 30, the side edge 31 'is at an angle α from the second wing panel 12'₂Extend distally angle α₂Greater than about 90, but less than about 180.

In use, the improved self-aligning two-wire corner bead 10 of the present disclosure is used in a contour-like manner to surround a steel structural member with a fire-retardant material. Referring to fig. 5, the single web plate 11 is fastened to the steel structural member 24. First wing 12 is configured to form a desired thickness of fire-blocking material 22 along both surfaces of the steel structural member by providing a rigid scraped edge on which nose 14 is attached. The double membrane plate 30 is fastened to the steel structural member 24 as will be explained further below. The fire-blocking material 22 surrounds the dimensions of the steel structural member 24 in a contour-like manner, following the steel structural member 24 in all dimensions. The single corner bead 10 allows the fire-blocking material 22 to follow three surfaces S₁、S₂And S₃And (4) uniformly distributing.

Referring to fig. 4 and 5, the width of wings 12 and 12' determines distance D₁、D₂And D₃And defines a substantially flat surface S₁、S₂And S₃Which form a set of corner protectors for fire-blocking material 22 distributed about steel structural member 24, similarly by varying angle α₁And α₂Can selectively vary any distance D₁、D₂And D₃Angle α₁And α₂Substantially equal and greater than about 90 °, but smallAt 180 deg. the angle β is about 90 deg., e.g., the angle α between the first wing panel 12 and the monoweb panel 11₁The smaller (less blunt) at the slat 26 and surface S₁A distance D between₁The longer, but at the strip 26 and the surface S₂A distance D between₃Similarly, the shorter the angle α between the second flap 12 'and the side edge 31' of the double web 30₂The less blunt, the distance D₂The longer and the distance D₁The shorter, so that relative to along the surface S₁Along surface S, of relatively thin strip 22 of flame retardant material₃Is distributed more thickly than the fire-protecting material 22.

In a preferred embodiment, angle α₁And α₂It should be determined so as to obtain a uniform thickness of fire-blocking material 22 along surface S1.

In one embodiment, the battens 26 are distributed around the steel structural members 24. The single web panel 11 is attached to the steel structural member 24 by the battens 26 by pneumatic fasteners 28 at a single fastening location on the single web panel 11. Other connecting or attaching means known in the art, such as weld pins or screws, may also be used.

In other embodiments, each of the single and double membrane plates 11, 30 is attached to the steel structural member 24 by pneumatic fasteners 28 at a single fastening location on the double membrane plate 30.

In other embodiments, the side edges 31 and 31' of the double membrane plates 30 are attached by pneumatic fasteners 28 at a single fastening location on the double membrane plates 30 through the battens 26 into the steel structural members 24. Other connecting or attaching means known in the art, such as weld pins or screws, may also be used. According to one embodiment of the invention, the battens 26 are optionally distributed along the entire perimeter of the steel structural member 24 to be fire-proofed (not shown). In other embodiments, the battens 26 are distributed along a portion of the perimeter of the steel structural member 24.

In other embodiments, any number of fastening locations and locations may be used.

The width of the first and second wings 12, 12' and the nose 14 attached to the outer edges of the wings act as a barrier during the fire protection process. The fire-blocking material 22 is then sprayed onto the strips 26 and spaced apart by the position of the nose 14 to determine the final thickness of the fire-blocking material 22.

Referring to fig. 5, in a shop application, i.e., where the fire-blocking material 22 is applied to the steel structural members 24 in a pre-fabricated arrangement, the cementitious composition is sprayed or poured, one layer at a time, onto the surface of the horizontally disposed battens 26. The steel structural member 24 is then rotated 90 deg., and the adjacent surfaces are placed horizontally to facilitate the application of the fire-blocking material 22. Using this process, each subsequent spray application allows the fire-blocking material 22 to harden before the next rotation of the steel structural member 24. It can be seen that the barrier-like function of the corner bead 10 according to one embodiment of the present invention is critical because it provides a suitable anchor surface for bonding subsequent layers of fire-blocking material 22. Each steel structural member 24 is rotated to apply the cementitious material uniformly to all surfaces.

It will be understood by those skilled in the art that any type of member may be used.

In a field application at a construction site, the steel structural members 24 are assembled into the structure prior to fire protection, and at the same time all surfaces of the steel structural members 24 may be sprayed or smeared onto the surfaces of the battens 26 (not shown).

It will be understood that the invention is not limited to the particular embodiments described above, but may be varied without departing from the scope of the invention as defined in the appended claims, which is to be interpreted in accordance with the principles of the main stream law, including the doctrine of equivalents which extend the practical scope of the claims beyond their literal scope, or any other principle. Unless the context indicates otherwise, the number of embodiments that refer to an element in a claim requires at least the specified number of embodiments of the element, whether referring to one embodiment or more than one embodiment, but is not intended to exclude from the scope of the claims structures or methods having more embodiments of the element. When used in the claims, the term "comprising" or derivatives thereof is used as non-exclusive, i.e., it is not intended to exclude the presence of other elements or steps in a structure or method.

Claims

1. A method of fireproofing a member comprising a set of surfaces with a fireproofing material, said method comprising the steps of:

attaching a corner bead to a subset of the set of surfaces, the corner bead comprising:

a welded wire mesh;

a set of bends integrally formed in the welded wire mesh;

a first wing defined by the set of bends;

a single web plate adjacent to the first wing plate defined by the set of bends;

a double web plate adjacent to the single web plate defined by the set of bends;

a second wing panel defined by the set of bends proximate the double web panel;

a plurality of substantially planar surfaces defined by the first wing and the second wing;

wherein the welded wire mesh is fastened to the member only at a first fastening location on the double-diaphragm plate; determining a thickness of the fire-blocking material based on the first wing and the second wing; and

applying the fire-blocking material to the member and the corner bead according to the thickness.

2. The method of claim 1, wherein the step of determining the thickness of the fire-blocking material based on the first wing panel and the second wing panel further comprises the steps of:

adjusting a first angle of the first wing; and

adjusting a second angle of the second wing.

3. The method according to claim 1, characterized in that the method further comprises the steps of:

positioning a set of slats 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 slats.