US3825217A

US3825217A - Brackets attachable to an outside bridge girder

Info

Publication number: US3825217A
Application number: US00314593A
Authority: US
Inventors: H Fleming
Original assignee: Individual
Current assignee: Individual
Priority date: 1971-08-27
Filing date: 1972-12-13
Publication date: 1974-07-23
Anticipated expiration: 1991-07-23

Abstract

A bracket is disclosed that is attachable to an outside bridge girder for supporting the form for a concrete overhang. The bracket includes a T-shaped member whose inner face is flat and whose head is attachable to the web of the girder with said face in contact therewith. The outer face of the member has an outwardly disposed reinforcement extending from its lower end into the head. The inner ends of a support and of a brace are welded to the member in vertically spaced relationship and the outer end of the brace is welded to the support adjacent its outer end which has an end plate having a portion disposed below the support which serves as an anchor for an additional brace.

Description

1451 July 23, 1974 BRACKETS ATTACHABLE TO AN OUTSIDE BRIDGE GIRDER [76] Inventor: Howard B. Fleming, 89 Pleasant Ave., South Portland, Maine 04106 [22] Filed: Dec. 13, 1972 21 Appl. No 314,593' a a .7

Related US; Application Data [63] Continuation of Ser, No. 175,500,'Au 27, 1971,

abandoned.

52 us. c1 248/205 R, 248/235, 249/211 51 Int. Cl E04g 3/00, A47g 29/02 [58] Field of Search, 248/205 R, 228, 235, 241, 248/243; 182/82, 113; 249/209, 211, 23, 207

3,077,645 2/1963 Fleming 248/235 X 3,165,288 1/1965 Jackson 3,383,080 5/1968 Frisbie 248/235 Primary ExaminerJ. Franklin Foss 57 ABSTRACT bridge girder for supporting the form for a concrete overhang. The bracket includes a T-shaped member whose inner face is flat and whose head is attachable to the web of the girder with said face in contact therewith. The outer face of the member has an outwardly disposed reinforcement extending from its lower end into the head. The inner ends of a support and of a brace are welded to the member in vertically spaced relationship and the outer end of the brace is welded to the support adjacent its outer end which has an end plate having a portion disposed below the support which serves as an anchor for an additional brace.

2 Claims, 3 Drawing Figures This application is a continuation of Ser. No. 175,500, filed Aug. 27,1971 now abandoned.

BACKGROUND OF THE INVENTION In bridge building, one of the problems is the construction of its marginal, concrete overhangs, an operation requiring the construction of an outwardly project- 'ing form extending lengthwise of each outside girder and attached thereto. Such forms consist of a series of outwardly projecting sills, joists supported thereby, and flooring. 1

The difficulties of constructing such forms lead to the development of the bracket, shown and described in my US. Pat. No. 3,077,645, which are readily attached to the webs of the girders (l-beams) and detached therefrom for re-use. These brackets have been widely used to advantage. In more detail, such brackets consist of a support provided with sill keepers and including at its inner end a plate to be bolted against the web of a girder, a brace welded to the support adjacent its outer end with its other end engageable with the web and a vertical spacer interconnecting the brace and the support adjacent their inner ends. An upwardly disposed plate at the outer end of the support serves as a backer for wedges ensuring the seating of the sill against the web.

While such brackets were effective and economical in use, they had the objectionable features that their web-engaging surfaces were small so that they were not adapted for use with such thin-webbed girders as are now commonly used.

THE PRESENT INVENTION The objective of the present invention is to provide form-supporting brackets of the above described type that are adapted for use with any I-beam used as a bridge girder.

These objectives are attained by providing brackets in which the support and the brace of each bracket are secured to the outer face of a T-shaped member whose entire rear surface is flat and is engageable with the web of the girder whenits head is bolted thereto with the length of the body of the member being unlimited except by the depth of the girder and the outer face of the body member including a vertical reinforcement extending the full length of the body and at least part way across the head. The connection between the brace and the body member is above the lower end thereof by a distance such that the load of the overhang is so distributed as to preventthe lower end of the body member from deforming the web.

Brackets in accordance with the invention also have their end plates include a portion exposed below their supports and serving to back the outer end of an extra brace dimensioned to seat against the junction of the web and the lower flange of the girder thus enabling the bracket to be used even with deep thin-webbed girders without the necessity of adding to the length of the body member. v

monly of plywood.

THE PREFERRED EMBODIMENT OF THE INVENTION In the accompanying drawings, a preferred embodiment of the invention is shown in which FIG. 1 is a side view of a bracketv in accordance with the invention installed and in support of an overhang supporting form;

FIG. 2 is a section taken approximately along the indicated lines 22 ofFIG. 1; and

FIG. 3 is a section taken approximately along the indicated lines 3-3 of FIG. 1.

In the construction of a concrete overhang marginally of a bridge, it is necessary to secure a form man outside girder 10. Such girders are I-beams and their dimensions vary as with the size of the bridge and its design with the web depth and thickness being important considerations in providing for the proper support of a form. A form typically includes a series of sills 11 on which joists 12 rest and covered by a floor 13, com- A form-supporting bracket in accordance with the invention consists of a T-shaped member, generally indicated at 14 consisting of a transversely disposed head 15 in the form of a plate and a vertical body generally indicated at 16 and consisting of a length of stock of right angular or U-shaped cross section shown as having its wall 16A coplanar with the head plate 15 and welded centrally to the lower edge thereof and providing a wall 168 disposed outwardly and extending vertically a substantial distance across the outer face of the head plate 15 and welded thereto. With this construction, the rear face of the member 14 is flat and of substantial area. The head plate 15 is provided with holes 17 located to register'with a selected pair of holes 18 spaced lengthwise along the web-of the girder to enable the brackets to be anchored thereto in a suitably spaced relationship by bolts 19 with the flat rear faces of their members 14 seated thereagainst'. The web holes 18 are spaced below the upper flange of the girder 10 to enable the floor 13 to underlie it. In practice, the lower end of the member 14 extends close to the bottom flange of the beam 10 so as to have a large webcontacting surface.

The bracket includes a sill support consisting of a pair of generally indicated members 20, each of stock that is right angular in cross section and disposed with their walls 20A spaced apart and coplanar and their walls 20B proximate and vertical with their inner ends straddling the upper end of the wall 168 of the member 14 and welded thereto and to the head plate 15. Sill keepers 21 are welded to the outer edges of the walls 20A and outer ends of the members 20 are welded to the central part of aplate 22 so that its upper and lower portions are exposed. The upper portions serve to back wedges 23 used to seat the supported sill 11 against the web of the girder. Wedges 23 are also used to level the form with the floor 13 against the undersurface of the upper girder flange.

A brace, generally indicated at 24, and of stock that is right angular in cross section has its inner end welded to the outer face of the body 16 of the member 14 and to its reinforcement 163 between the ends thereof. The connection between the brace 24 and the body 16 is sufficiently above the lower end of the body to ensure that the load of the overhang is so distributed both above and below the connection to prevent the lower end from deforming the web. Desirably and as shown, the connection is approximately midway between the ends of the body 16. At the outer end of the brace 24, its wall 24A is cut away so that it may be welded to the wall 21A of one of the members 21 with its wall 248 extending between and welded to their walls 21B.

Because of the fact that the T-shaped members present a large, fiat area bearing against the outer face of the web of the girder l and because of the location of the connection between the brace 24 and the body 16, the brackets can be used with so called thin-walled girders. In the case of deep, thin-walled girders 10, additional bracing is usually desirable. In accordance with the invention, an additional brace, such as a wooden brace 25, has its inner end seated against the junction of the web of the girder and its bottom flange with its outer end backed by the lower portion of the plate 22 which is provided with holes 26 to accommodate anchoring spikes 27.

I claim:

1. A bracket attachable to the outside of the web of an outside l-beam of a bridge for use in the construction of a concrete overhang, said bracket comprising a head plate to seat against the web and having laterally spaced holes for attaching bolts that are to extend through correspondingly spaced holes in the l-beam web, a vertical body member of a length of stock having first and second walls disposed at right angles to each other, the upper end of the first wall terminating short of the second wall by a distance such that the length of the upwardly extending end of the second wall is about equal to the height of the head plate, the upper edge of the first wall being welded to the bottom edge of the head plate centrally thereof with their rear faces in the same plane so that said first wall seats against the web when the head plate is bolted thereto, the inner edge of said upwardly extending end of said second wall of the body member being welded to the outer face of the head plate centrally thereof, a support for a sill of the form and welded to said head and to said second wall, and a brace welded to the support adjacent the outer end thereof and to said body above the lower end thereof by a distance such that the load of the overhang is distributed both above and below the junction of the brace and the body to prevent said lower end from deforming the web.

2. The bracket of claim 1 in which the brace is welded to the body approximately midway between the ends thereof.

Claims

1. A bracket attachable to the outside of the web of an outside I-beam of a bridge for use in the construction of a concrete overhang, said bracket comprising a head plate to seat against the web and having laterally spaced holes for attaching bolts that are to extend through correspondingly spaced holes in the Ibeam web, a vertical body member of a length of stock having first and second walls disposed at right angles to each other, the upper end of the first wall terminating short of the second wall by a distance such that the length of the upwardly extending end of the second wall is about equal to the height of the head plate, the upper edge of the first wall being welded to the bottom edge of the head plate centrally thereof with their rear faces in the same plane so that said first wall seats against the web when the head plate is bolted thereto, the inner edge of said upwardly extending end of said second wall of the body member being welded to the outer face of the head plate centrally thereof, a support for a sill of the form and welded to said head and to said second wall, and a brace welded to the support adjacent the outer end thereof and to said body above the lower end thereof by a distance such that the load of the overhang is distributed both above and below the junction of the brace and the body to prevent said lower end from deforming the web.