US2212492A - Expansion and contraction joint - Google Patents

Description

7, 1940. A. E. BRICKMAN ET AL EXPANSION AND CONTRACTION JOINT 2 hee tS-Sheet 1 Filed July 15, 1957 Yii. 44v 5. GE 4 8- 7, 1940. A. E. BRICKMAN ET AL EXPANSION AND CONTRACTION JOINT Filed July 15. 1937 2 Sheets-Sheet a ZN W 0N0 a Mam P E CL w? 054 E5. flfi m Patented Aug. 27, 1940 EXPANSION AND CONTRACTION JOINT Alan E. Brickman and George A. Gleason, Worcester, Mass" assignors to The American Steel and Wlre ompany of New Jersey, a. corporation of New Jersey Application July 15, 1937, Serial No. 153,830

The present invention relates to a transload device for expansion and contraction joints in concrete roadways, pavements and the like.

An object of the present invention is to provide a device designed to transfer loads passing over the surface of a roadway from one slab, across a transverse expansion and contraction joint, to an adjoining slab.

A further object of the invention relates to the provision of a casting of simple design which is so shaped and arranged as to provide an anchorage in the concrete slabs.

Other objects and advantages will become apparent as the description proceeds in which:

Figure 1 is a top plan of the transload devices arranged across a road bed,

Figure 2 is a side elevation of Figure 1,

Figure 3 is a section on line IIIIII of Figure 2, and,

Figure 4 is a view similar to Figure 3, showing the expansion joint compressed.

In the drawings, the numeral 2 represents a casting designed to bond with a large area in one of the concrete slabs. This casting is provided 25 with a lateral extension 3, adapted to extend through the joint filler 4 and into a hollow cylindrical sleeve 5 imbedded in a recess in the adjoining concrete slab.

The lateral extension 3 is provided with an aperture 6 through which is positioned an arcuate bar I. The hollow cylindrical sleeve 5 is provided with apertures to permit the arcuate-shaped bar 1 to pass therethrough.

The casting 2 is provided with a reenforcing rib 8 extending in an opposite direction to the lateral extension 3, while diverging angularly from each side of said reenforcing rib 8 are flanges or wings 9. By such a construction of the casting 2, wet concrete will flow in, around and underneath the casting by gravity, thereby eliminating any likelihood of voids being formed in the concrete adjacent the casting and, at the same time, producing the necessary anchorage for the transload device of the present invention.

The lateral extension 3 projects only a short distance within the sleeve 5 in order to permit movement of the lateral extension within the sleeve 5 during expansion and contraction of the adjoining concrete slabs of the road bed.

Due to the arcuate bar I being passed through the apertures in the lateral extension 3 and the cylindrical sleeve 5, an interlock is provided between these members and assembles the lateral extension of the casting 2 with the cylindrical sleeve 5 and distributes the concentrated load away from the joint.

In the showing in Figure 1, the transload devices are shown as being staggered at the joint. However, if desired, the castings 2 may be arranged on the same side of the joint. Due to the construction hereinabove described, wherein the lateral extension 3 has a relative movement within the sleeve 5, the concentrated stresses in the concrete roadway and in the steel from which the transload device is formed are distributed over a suflicient area so that critical stresses in the materials are not developed under the loads imposed by even the heaviest type of vehicles likely to pass over the surface of the roadway.

While we have shown and described a specific embodiment of the present invention, it will be understood that we do not wish to be limited exactly thereto, since various modifications may be made without departing from the scope of the invention as defined by the following claims.

We claim:

1. A transload device for expansion and contraction joints comprising an anchor embedded in a concrete slab, a dowel affixed to said anchor, a slot extending lengthwise of said dowel, and a bar-like member embedded in the adjoining concrete slab and extending through said slot in said dowel so as to extend in directions generally normal to the dowel.

2. In a device of the class described, an anchor embedded in a concrete slab including an upright member, a pair of wing-flanges disposed each upon opposite sides of said upright member, said wing-flanges extending substantially normal to said face and being canted upwardly from said member and defining an acute angle therewith, and a dowel afllxed to said anchor.

3. In a device of the class described, an anchor member embedded in a concrete slab comprising a relatively vertical face, a fin extending from said face arranged also vertically and substantially perpendicular thereto, a pair of wing-like flanges each extending substantially normal to said face and being canted upwardly and away from said fin on opposite sides thereof at an acute angle thereto, and a dowel member projecting from the opposite side of said face, substantially normal thereto.

4. The invention defined by claim 3, including a flange normal to said fin secured along the top edge of said face and extending upwardly and away therefrom approximately to overlie portions of said fin and wing-flanges.

5. The invention defined by claim 3, including a slot in said dowel and a bar-like member extending through said slot and disposed transversely of said dowel.

6. In a concrete roadway joint, 8. transload device embedded in adjacent concrete slabs including an anchor element having an upright member and a pair of oppositely extending flanges inclined upwardly from said member, the member and flanges being embedded in one slab, said flanges being operable to deflect the material forming the slab beneath the anchor and into contact with the upright member, and a dowel extending from the anchor into the adjacent slab, a sleeve upon the dowel, aligned openings through said sleeve and dowel, and a bar-like piece disposed through said openings.

'7. In a concrete roadway joint, a transload device embedded in adjacent slabs including an v anchor element embedded in one slab and a connecting dowel extending from the anchor into an adjacent slab, said dowel being horizontally slotted, and a bar-like member disposed in the slot transversely of the dowel and extending therebeyond into the slab, the slot permitting relative movement of the dowel and anchor relative to the bar-like member in a horizontal direction and preventing substantial relative verti-

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