US1591803A - Contraction joint - Google Patents

Description

July 6 1926. 1,591,803

B. BRIODY OOOOOOOOOOOOOO NT Patented July 6, 192..

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BERNARD BRIODY, OF YOUNGSTOWN, OHIO, ASSIGNOR TO TRUSOON STEEL COMPANY, OF YOUNGSTOWN, OHIO, A CORPORATION OF MICHIGAN.

CON TRACTION JOINT.

Application filed July 9,

This invention relates to the construction of com-rote roadways, particularly to those provided with metal strips for the purpose of forming contraction joints, and the object of this invention is to provide means for connecting the ends of alined strips.

A further object of this invention is to 'irovidc removable means adapted to be mounted on the tops of the dividing strips for the purpose of forming narrow troughs in the'concrete roadway adapted to receive tar or asbestos.

In the accompanying drawing, Fig. 1 is a plan of a section of roadway. Fig. 2 is a perspective of two ends of a dividing strip joined with my improved connector. Fig. 3 is a section on the line 3-3 of Fig. 2. Fig. 4 is a section. of concrete roadway on the line 4;4 of Fig. 3.

Similar reference characters refer to like parts throughout the several views.

In order to make sure that concrete roadways 1 will crack along straight lines when the plastic mass contracts or when it is displaced vertically by frost, strips 2 of sheet metal are embedded therein to act as di viders to locate the cracks. edges of roadwayslabs may be caused to rise and fall together by forming these strips with longitudinal channels 3 which extend into and receive similarly formed portions of the adjacent slabs. The strips are formed with holes 4; in the walls of the rhannels to receive supporting stakes to hold the strips in posit-ion while the concrete is being placed and with other holes 5 to receive transverse reinforcements for the slabs, I

The adjacent ends of two strips 2 may be kept in alinement by a connector comprising the plate 6 having struck-up tongues 7 so spaced from the plane of the plate as to just admit the ends of the strips. The

The adjacent 1924. Serial No. 724,945.

width of these strips is preferably a little I mg strips, the tops of these cap strips being even with the finished upper surface of the roadway. This cap strip is left in as long as possible before being removed, but it must be taken out before the concrete has set sufliciently to prevent its removal, The space thus left is then filledwith a lastic mass 9, such as asphalt or tar, whic revents the edges of the concrete from cliipping. The connectors 6 hold the dividing strips in alinement so that the cap strips may be readily fitted thereto.

These contraction joints are not intended to prevent a roadway from cracking, but they do cause the cracks to occur along straight lines and the slight spaces thus formed are filled by the plastic material 9.

I claim 1. Ina concrete roadway, alined channelshaped strips adapted to be embedded end to end therein for the purpose of forming a contraction joint, and means connecting the ends of adjacent strips comprising a plate adapted to lie on one side of each strip within the channel thereof and supported by the lower wall of the channel and struck-up tongues adapted to lie on the opposite side of each 'such strip, said tongues extending in opposite directions from the middle of the plate.

2. Means for alineing the adjacent ends of strips adapted to be embedded in concrete roadways to produce contraction joints, comprising a metal plate provided with tongues at both ends lying on opposite sides of the adjacent ends of the strips.

BERNARD nnronr

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