US3782675A

US3782675A - Concrete supporting form and a hanger therefor

Info

Publication number: US3782675A
Application number: US00209271A
Authority: US
Inventors: M Boll; R Macrobbie
Original assignee: Richmond Screw Anchor Co Inc
Current assignee: General Electric Co; Richmond Screw Anchor Co
Priority date: 1971-12-17
Filing date: 1971-12-17
Publication date: 1974-01-01
Anticipated expiration: 1991-01-01

Abstract

Concrete forms are provided comprising an I-beam including a web and upper and lower flanges on the web. The flanges each have side edges and upper and lower surfaces between the edges. A hanger is supported on the upper surface of the upper flange. This hanger includes a strut which traverses the upper flange and also includes first and second U-shaped brackets straddling and connected to the strut at the ends thereof. The brackets have lower surfaces resting on the upper surface of the upper flange. One bracket is internally provided with a rectilinear receptacle extending at an acute angle to the upper surface of the upper flange and in a direction which is down and outward of the corresponding flange edge. This acutely disposed receptacle may also be perpendicular to the flange. The second bracket includes a portion extending below the upper surface of the upper flange and being engaged against the corresponding edge of the upper flange. This portion is provided with a rectilinear receptacle perpendicular to the upper flange and offset from the corresponding edge thereof. Concrete supporting members extend outwardly from the web and engage against the lower surface of the upper flange. Bolts extend through the aforesaid receptacles and concrete supporting members and locking means are provided on the bolts to hold the concrete supporting members in position. The hanger can be provided, in accordance with one embodiment, with a further U-shaped receptacle supported on an L-shaped arm connected to the aforesaid strut. The strut is preferably arranged at an angle to the supporting flange.

Description

United States Patent [1 91 Boll et a1.

Jan. 1, 1974 CONCRETE SUPPORTING FORM AND A HANGER THEREFOR [75] Inventors: Martin William Boll; Robert Murray MacRobbie, both of New York, N.Y.

[73] Assignee: Richmond Screw Anchor (10., New

York, N.Y.

[22] Filed: Dec. 17, 1971 211 App]. No.: 209,271

Related US. Application Data [62] Division of Ser. No. 23,844, March 30, 1970,

abandoned.

[52] US. Cl. 249/23, 249/211 [51] Int. Cl. E04g 17/16 [58] Field of Search 249/23, 24, 25, 19, 249/207, 210, 211

[56] References Cited UNITED STATES PATENTS 2,985,937 5/1961 Hillberg 249/211 X 2,985,936 5/1961 Hillberg 249/211 X Primary Examiner l. Spencer Overholser Assistant ExaminerDeWalden W. Jones Attorney-Waters, Roditi, Schwartz & Nissen [5 7] ABSTRACT Concrete forms are provided comprising an l-beam including a web and upper and lower flanges on the web. The flanges each have side edges and upper and lower surfaces between the edges. A hanger is supported on the upper surface of the upper flange. This hanger includes a strut which traverses the upper flange and also includes first and second U-shaped brackets straddling and connected to the strut at the ends thereof. The brackets have lower surfaces resting on the upper surface of the upper flange. One bracket is internally provided with a rectilinear receptacle extending at an acute angle to the upper surface of the upper flange and in a direction which is down and outward of the corresponding flange edge. This acutely disposed receptacle may also be perpendicular to the flange. The second bracket includes a portion extending below the upper surface of the upper flange and being engaged against the corresponding edge of the upper flange. This portion is provided with a rectilinear receptacle perpendicular to the upper flange and offset from the corresponding edge thereof. Concrete supporting members extend outwardly from the web and engage against the lower surface of the upper flange. Bolts extend through the aforesaid receptacles and concrete supporting members and locking means are provided on the bolts to hold the concrete supporting members in position The hanger can be provided, in accordance with one embodiment, with a further U-shaped receptacle supported on an L- shaped arm connected to the aforesaid strut. The strut is preferably arranged at an angle to the supporting flange.

6 Claims, 6 Drawing Figures i l \OUOOUOUL on PATENTEB JAN H974 SHEU 1 OF 4 v O OOOOOOOOOOOOOOOO NW Q PATENTED 1 74 SHEET 3 BF 4 .m wl

PATENTEDJAH 11914 1 saw u or 4 CONCRETE SUPPORTING FORM AND A HANGER THEREFOR This application is a division of Ser. No. 23,844 filed Mar. 30, 1970, now abandoned.

BACKGROUND 1. Field of Invention This invention relates to concrete supporting forms and to hangers for supporting such forms from structural elements such as I-beams.

It is an object of the invention to provide an improved hanger construction and an improved concrete form suitable for receiving uncured concrete and supporting the same in position while the concrete sets.

Another object of the invention is to provide an improved concrete form including a hanger construction adapted for absorbing forces acting transversely of the supporting beam, while maintaining form supporting bolts in spaced relationship to the edges of the flange of the supporting beam.

Yet another object of the invention is to provide an improved concrete form including a hanger construction which prevents associated form supporting bolts from being brought into engagement with the edges of a supporting element, thereby facilitating the disengagement of the hanger from the supporting element when its function has been performed.

2. Prior Art US. Pat. Nos. 2,985,936 and 2,985,937 disclose commercially available hangers which rest upon the top of a supporting beam or girder flange.

When such hangers are used to support a cantilever overhang or fascia or are otherwise not equally loaded on both sides, there is a tendency towards instability. This is true whether the cantilever side is arranged at 90 or at an angular disposition such as, for example, 45", which is fairly common in practice.

To contain the horizontal component of the forces, it was previously believed necessary to bring the bolt supported in the hanger against the beam flange. This subjects the bolt to bending and as well makes it difficult to remove.

Another method employed heretofore has been to weld the hanger to the supporting beam. This technique is costly and, moreover, is often unacceptable due to State or Federal regulations.

If the increasing use of outboard screeding and steel fascia brackets, the above-noted situation becomes even more serious, due to the greater loads imposed on the hangers. Thus it is seen that the prior art is subject to various deficiencies which are generally avoided in accordance with the objects of the invention.

SUMMARY OF THE INVENTION The invention generally drops the inboard end of a hanger so that part of the same is below the top flange of the associated beam, thereby using the flange to absorb the horizontal components. The method which is employed and as will be hereinafter described in greater detail, prevents the inboard end of the hanger from jumping out of position due to uplift.

The hanger of the invention is particularly useful in stay-in-place corrugated decking, where only a onesided hanger is required. Herein a hook bolt fastened to the bottom of the flange prevents uplift.

In accordance with one embodiment of the invention, there is provided a concrete form comprising an I-beam including a web and upper and lower flanges on this web. The flanges each have side edges and upper and lower surfaces between these edges. A hanger is supported on the upper surface of the upper flange and the hanger includes a strut traversing the upper flange and first and second U-shaped brackets straddling and connected to the strut at the ends of the latter. The brackets have lower surfaces resting on the upper surface of the upper flange. The first bracket is internally provided with a rectilinear receptacle extending at an acute angle to the upper surface of the upper flange and in a direction which is down and outboard of the corresponding flange edge. Alternatively, there can be provided a receptacle which is perpendicular to the corresponding flange. The second bracket includes a portion extending below the upper surface of the upper flange and which is engaged against the corresponding edge of the upper flange. This portion is provided with a rectilinear receptacle perpendicular to the upper flange and offset from a corresponding edge thereof. Concrete supporting members extend outwardly from the web and engage against the lower surface of the upper flange. Both are employed to extend through the receptacles and concrete supporting members and locking members are provided on the bolts to hold the concrete supporting members in position.

According to a feature of the invention, a further receptacle may be provided adjacent one of the first said receptacles, this further receptacle being mounted on an L-shaped arm which is connected to the abovenoted strut.

According to a further feature of the invention, the brackets are provided with substantially coplanar lower surfaces which rest on the upper surface of the upper flange.

According to still another feature of the invention, the lower surfaces of the U-shaped brackets respectively terminate at or inboard of the edges of the upper surface of the supporting flange.

Still another feature of the invention relates to the fact that the strut includes end faces which at least in part limit the radial or diametral extent of the receptacles.

Advantageously, the strut may be provided in the form of a rectilinear rod which extends closely adjacent the lower surface of one of the brackets, but which is spaced to a substantially greater extent from the lower surface of the upper of the brackets. As to these receptacles, the bolts will extend therethrough in spaced relationship from the flange edges.

The above and further features of the invention will be described in greater detail hereinafter with reference to the accompanying drawing.

BRIEF DESCRIPTION OF DRAWING FIG. 1 is a partially sectional view of a concrete sup porting form embodying a hanger provided in accordance with one embodiment of the invention;

FIG. 2 is a view corresponding to FIG. 1 of a second concrete supporting form provided in accordance with the invention;

FIG. 3 is a side view of a hanger provided in accordance with one embodiment of the invention;

FIG. 4 is a side view of a hanger provided in accordance with a further embodiment of the invention;

FIG. 5 is a side view of still another hanger provided in accordance with the invention; and

FIG. 6 is a top view of the hanger illustrated in FIG. 5.

DETAILED DESCRIPTION OF INVENTION In FIG. 1 is illustrated a concrete supporting form embodying a hanger in accordance with the principles of the present invention.

More particularly, in FIG. 1 is illustrated a beam 10 including a web 12 having an upper flange 14 and a lower flange 16. Upper flange 14 has an upper surface 18 and a lower surface 20. Lower flange 16 has an upper surface 22 and a lower surface 24.

Supported atop the upper surface of the upper flange is a hanger indicated generally at 26, this hanger including a central strut 28 and

U-shaped brackets

30 and 32 respectively supporting

bolts

34 and 36.

Concrete supporting members are indicated generally at 38 and 40, these including upper plywood sheets 42 and 44 supported on wooden vertical elements such as indicated at 46 and 48, which are in turn supported by horizontal wooden beams 50 and 52.

The bolts extend through the plywood sheets 42 and 44 and through the horizontal elements 50 and 52, there being provided locking members 54 and 56 which serve to hold the concrete supporting elements on the above-noted bolts with the sheets 42 and 44 engaging upwardly against the lower surfaces of the upper flange 14.

Completing the aforenoted construction is a vertical section 60 with a brace 62, there being a triangularshaped frame 64 including one leg 66 pivoted at 68 to vertical leg 70 and engaging at extremity 72 against the web 12 of beam 10.

Triangular member 64 constitutes a jack adjustable at 74 to retain horizontal member 50 in horizontal attitude.

From the above it will be seen that the strut 28 is sloped relative to the upper flange 14 and it will also be noted that the U-shaped bracket 32 includes a portion cupping around the edge of the upper flange 14 and bearing edgewise against the edge of the latter. The purpose of this arrangement is to absorb the horizontal vector of the forces acting along the bolt 32 so that such forces are absorbed in the right-hand edge of the flange 14 as indicated at 76. The force acting downwardly on bolt 36 prevents the U-shaped bracket 32. from lifting upwardly and therefore a very firm resistance is provided with respect to forces tending to pull the hanger 26 from the top of the l-beam 10.

Hangers of the invention will be described in greater detail hereinafter. However, first reference will be made to FIG. 2, in which a further form provided in accordance with the invention is illustrated.

In FIG. 2 are shown concrete supporting members 80 and 82, there being also shown a beam 84 atop which is a hanger indicated generally at 86.

In this embodiment of the invention there will be noted that a horizontal member 88 is supported by a bracing member 90, the end 92 of which is accommodated in a corner formed between web 94 and lower flange 96. More particularly, the end 92 engages against the web and against the upper surface of the lower flange 96.

In this embodiment of the invention it will be seen that on one side of the beam 82 is positioned a bolt 93, whereas on the other side are provided an angularly disposed bolt I and a perpendicularly disposed bolt 102. All of these bolts are provided with appropriate locking members to hold the concrete supporting members in position, snugling up against the lower surface of the upper flange of the associated beam. The details of the illustrated hanger will be referred to hereinafter.

FIG. 3 illustrates one form of hanger provided in accordance with an embodiment of the invention, the hanger being adapted for support on the upper surface of a flange 112 of an I-beam which further has lateral or side edges 1 14 and 1 16. The hanger is indicated generally at 118.

Hanger 118 includes a central strut 120 which is a rectilinear rod of a material such as steel. At the opposite ends of the rod 120 are

U-shaped brackets

122 and 124. These members are also of steel and are connected to rod 120 by welding or the like.

Brackets

122 and 124 are provided with coplanar

lower surfaces

126 and 128, these being adapted to rest upon the upper surface 1 10 of flange 112. Surface 128 terminates at 130 inwardly of edge 116 of flange 112, whereas surface 126 terminates at 132 directly at the edge 114 on the other side of the flange 112.

The

U-shaped members

122 and 124 are provided with bolt receiving receptacles and 142, these receptacles being rectilinear and perpendicularly disposed with respect to upper surface 110 and flange 112. These receptacles are so disposed that

bolts

144 and 146 accommodated therein are spaced from the

edges

114 and 116 of flange 112 and do not come to bear thereagainst. This avoids the trouble of the prior art, in which the bolts supported by the hanger, come to bear against the edges of the flange and can only be removed from the supporting beam with substantial difficulty after a concrete load has been disposed upon the associated form.

In addition it will be noted that as an important feature of the invention, the U-shaped bracket 122 is provided with a portion 150 which extends below the upper surface 110 of flange 112 and cups against or is placed in abuting relationship edgewise with edge 114 of flange 112, as indicated at 152. This means that all forces F acting in the direction of arrow 154 will be absorbed by the edge 114 of flange 112 and that this can be accomplished without bringing the bolt 146 into contact with edge 1 14. This is a very significant advantage over the constructions provided by the prior art.

It is also to be noted with respect to FIG. 3 that end of rod 120 approaches very closely to the upper surface of the flange 1 l2 and that the rod 120 is sloped relative to upper surface 1 10. Thus the end 162 is comparatively spaced at a large distance from the surface 110, as compared with the end 160. This has the effect of avoiding the consequence of turning moments tending to pivot the hanger 118 off of the top surface 110 of flange 112 and this constitutes another important feature of the invention.

In FIG. 4 is illustrated a hanger 170, provided in accordance with another embodiment of the invention. This hanger includes a center strut 172 having mounted on the ends thereof

U-shaped brackets

174 and 176. The U-shaped bracket 174 is substantially like the bracket 122 referred to hereinabove with respect to FIG. 3. U-shaped bracket 176 is, however, so disposed as to have its receptacle 178 arranged at an angle of approximately 45 to the upper surface 180 of the flange 182. In this receptacle is accommodated a bolt 184 which is directed downwardly and outwardly of the edge 186 of flange 182. The use of a bolt disposed in this attitude is seen by referring to FIGS. 1 and 2 described hereinabove.

In the embodiment of the invention illustrated in FIG. 4, a cupping or edgewise engagement is once again employed, as illustrated at 188, so that forces applied along the strut 172 are absorbed edgewise by flange 182.

FIGS. 5 and 6 illustrate, in accordance with a further embodiment of the invention, a hanger 200 having a center strut 202 and two

U-shaped brackets

204 and 206. Aside from the fact that bracket 206 is arranged at a lesser angle with respect to the upper surface of flange 208, the described portion of this embodiment of the invention is similar to that illustrated in FIG. 4.

However, in this embodiment of the invention there is provided an L-shaped arm 210 including a leg 212 and a leg 214. Leg 212 is disposed perpendicularly with respect to strut 202 and is welded thereto. Leg 214 extends in parallel to the strut 202 and supports a further U-shaped bracket 216 having a bolt-receiving receptacle 218 extending in a direction which is perpendicular to flange 208 and is disposed in a manner as to support a bolt 220 in spaced relationship to the right-hand end of flange 208.

The lower surface terminates at 222, at a position which is spaced from the right-hand edge of the flange 208, so that both lower surfaces of both brackets at the right-hand end of hanger 200 are spaced inwardly of this edge of the flange.

At the left-hand end of flange 208, the bracket 204 is arranged in cupping relationship so that all forces acting along strut 202 are absorbed edgewise by this flange.

From the embodiments of the invention described hereinabove, it is seen that in accordance with the invention there is provided a hanger adapted to seat on the upper surface of a beam flange and to suspend a load from this beam flange. It is further seen that this hanger comprises a strut which traverses the flange with U-shaped brackets straddling the ends of the strut and being connected thereto such as by welding. These U-shaped brackets have lower surfaces, preferably arranged in coplanar relationship and adapted to seat on the upper surface of the flange. The brackets are each provided with a bolt-receiving receptacle and at least one of the brackets includes a portion extending outwardly of the flange and extending below the upper surface thereof to provide for edgewise engagement of the flange and the dissipation of horizontal forces into the same.

The receptacle of one bracket may be adapted for disposition perpendicular to the upper surface of the flange and outwardly of the flange, whereas the other receptacle may be disposed at an acute angle relative to said surface or also perpendicularly with respect thereto. These lower surfaces are preferably at least substantially coplanar and that surface which is not associated with the U-shaped bracket will be spaced inwardly of the corresponding edge of the supporting flange.

In accordance with one embodiment of the invention, as shown above, an L-shaped arm may be attached to the central strut to support still a further U- shaped bracket, in which case its receptacle may preferably be perpendicular to the supporting flange, whereas the juxtaposed bracket will be angularly disposed with respect to this flange.

It will be noted that the ends of the central struts of the various hangers have end faces which in part limit the receptacles in a diametral or radial extent. The rods are preferably rectilinear members, one end of which extends closely adjacent the lower surface of one of the brackets, whereas the other end is spaced to a substantially greater extent from the lower surface of the other bracket.

What is claimed is:

l. A concrete form comprising an I-beam including a web and upper and lower flanges on said web, said flanges each having side edges and upper and lower surfaces between said edges, a hanger supported on the upper surface of the upper flange, said hanger including a strut traversing the upper flange and first and second U-shaped brackets straddling and connected to the strut at the ends of the latter, said brackets having relatively smooth lower surfaces resting on the upper surface of the upper flange, said first bracket being internally provided with a rectilinear receptacle extending at an acute angle to the upper surface of the upper flange and in a direction which is down and outboard of the corresponding flange edge, said second bracket including a portion extending below the upper surface of the upper flange and being engaged against the corresponding edge of the upper flange, said portion being provided with a rectilinear receptacle perpendicular to said upper flange and offset from the corresponding edge thereof, concrete supporting members extending outwardly from said web and engaging against the lower surface of the upper flange, bolts extending through the receptacles and concrete supporting members, and locking means on the bolts to hold the concrete supporting members in position.

2. A form as claimed in claim 1, wherein one of said locking means comprises an angularly disposed bracing member coupled to the corresponding bolt and engaging said web and the upper surface of the lower flange.

3. A form as claimed in claim 1, wherein one of said locking means includes a triangular frame work including a leg bearing against said web above.

4. A form as claimed in claim 1, wherein said bolts are spaced from the edges of the flanges.

5. A form as claimed in claim 1, wherein said strut is a rectilinear rod which is sloped relative to the upper surface of the upper flange.

6. A form as claimed in claim 1, wherein said hanger includes an L-shaped arm connected to said strut, a further U-shaped bracket adjacent said first bracket and supported on said arm, said further bracket being provided with a rectilinear receptacle perpendicular to said upper flange and outboard of the corresponding edge of the latter, a bolt extending through the latter said receptacle, spaced from the latter said edge and extending through one of the concrete supporting members, and locking means on the latter said bolt to engage the corresponding concrete supporting members.

Claims

1. A concrete form comprising an I-beam including a web and upper and lower flanges on said web, said flanges each having side edges and upper and lower surfaces between said edges, a hanger supported on the upper surface of the upper flange, said hanger including a strut traversing the upper flange and first and second U-shaped brackets straddling and connected to the strut at the ends of the latter, said brackets having relatively smooth lower surfaces resting on the upper surface of the upper flange, said first bracket being internally provided with a rectilinear receptacle extending at an acute angle to the upper surface of the upper flange and in a direction which is down and outboard of the corresponding flange edge, said second bracket including a portion extending below the uPper surface of the upper flange and being engaged against the corresponding edge of the upper flange, said portion being provided with a rectilinear receptacle perpendicular to said upper flange and offset from the corresponding edge thereof, concrete supporting members extending outwardly from said web and engaging against the lower surface of the upper flange, bolts extending through the receptacles and concrete supporting members, and locking means on the bolts to hold the concrete supporting members in position.