US2319972A

US2319972A - Pavement joint

Info

Publication number: US2319972A
Application number: US413877A
Authority: US
Inventors: Alan E Brickman
Original assignee: American Steel and Wire Company of New Jersey
Current assignee: American Steel and Wire Company of New Jersey
Priority date: 1940-11-19
Filing date: 1941-10-06
Publication date: 1943-05-25
Anticipated expiration: 1960-05-25

Description

May 25, 1943. A. E; BRICKMAN 2,319,972

PAVEMENT JOIN'L Original Filed Nov. 19, 1940 444W 5 5Q/CKM4/V,

Patented May 25, 1943 2,3 9,972 PAVEMENT JoINT Alan Brickman, Monongahela Pa., assignor to The American Steel and Wire Company of New Jersey, a corporation of New Jersey Original application November 19, 1940, Serial N 0.

Divided and this application October 6, 1941, Serial No. 413,877

4 Claims.

described are in wide usage, but a great many of these either fail to permit contractive movement of the pavementor are expensive to manufacture and install, or lack durability.

It is an object of the present invention to provide a pavement joint which avoids the foregoing disadvantages.

The invention, then, comprises the features hereinafter fully described and as particularly pointed out in the claims, the following description and the annexed drawing setting forth in detail a certain illustrative embodiment of the invention, this being indicative of one of the number of ways in which the principles of the invention may be employed.

In said drawing:

Figure l is a side elevation of the device of the present invention showing the manner in which it is disposed with respect to the pavement within which it is embedded.

Figure 2 is a sectional view on the line IIII of Figure 1.

Referring more particularly to the drawing, the numeral I generally designates the base member of the pavement joint of the present invention. More specifically, the base member I takes the form of a malleable iron or steel member having oppositely disposed extensions 2. As shown in dotted lines in Figure 1, the ends of the oppositely disposed extensions of the base member I may be hollow for the purpose of providing a tapering wall thickness in order to decrease Weight. Integrally formed on the base member I and in parallelism one with respect to the other there is carried a pair of vertical uprights 3 which provide reversely curved portions 4 extending toward each other and terminating in elongated complemental vertical extensions 5. The upper ends of the complemental vertical extensions 5 carry oppositely extending horizontal portions 8 which are adapted to be imbedded in the adjacently disposed pavement which the joint of the invention is adapted to connect.

The outer ends of the oppositely disposed extensions are held in place by means of pins 31 which are driven into the earth. These pins 2| intersect the hollow portions of the oppositely disposed extensions 2 at positions adjacent the outer ends thereof, as shown.

After the pavement joint has been installed and the concrete or other paving material poured, the construction and arrangement is such that with a decrease in temperature the adjacent slabs contract so as to move on the subgrade. When the drag of the pavement exceeds the tensile strength of the slab, a controlled crack occurs. After such a crack occurs, transload value across the abutting end is only equal to the fragmentary shear unless transload devices are used.

The function of the device of the present invention in transferring the tra'fiic load from the end of one paving slab to the next paving slab is as follows:

As the trafiic load is established adjacent the end of one of th paving slabs, there is established a compression force on the extension 2 which is immediately therebelow. 'The rigidity and resistance of the base member to bend across the distance btween it and the other extension 2 diverts this force into tensionon the opposite complemental vertical extension 5, which in turn is securely bonded in the opposite paving slab at its integrally formed horizontal extension 8. As the traffic load moves onto the next paving slab, the forces are reversed in complemental function.

.It is among the teachings of the present invention to provide a corrugated plate 46 which is disposed as shown in the drawing prior to the pouring of the concrete, to form a predetermined cleavage line in the pavement slab under low temperature construction conditions. Predetrmined cleavage or cracks are more favorable than that which might otherwise occur, as it permits use of a load transfer device which will maintain surface alignment of the two portions of the broken slab.

The corrugated plate "56 is preferably continuous across substantially the entire width of the pavement; and in order to adapt it for cooperation with the transverse mid-portion of the base members I is preferably provided with half oval cut-outs along the base line at predetermined spacing, whereby the said half-oval cut-outs may straddle said base members I at the points indicated. Such construction is illustrated at the bottom of Figure 2,

This application is a division of my copending application Serial No. 366,307, filed November 19, 1940, and entitled Pavement joint.

While I have shown and described one specific embodiment of thepresent invention, it will be exactly thereto, since various modifications may spectively adjacent each of the end faces of the I latter, the upper extremity of each upright member being turned to penetrate for a substantial distance into its respectively proximate slab section in a substantially horizontal direction to provide firm anchorage and enable the upright members aforesaid to function as tension straps in the transverse transmission of applied loading on the surface of the pavement, and a vertically-extending member disposed between said upright members and terminating short of the surface of the pavement, said last-named member being adapted to form a predetermined cleavage line in the pavement under contraction conditions.

2. A joint for concrete pavement and the like, comprising a unitary base member adapted to underlie the joint and extend in opposite directions for a substantial distance beneath each slab, a pair of integral upright members carried by said base member so as to extend upwardly in substantial parallelism within the slab sections respectively adjacent each of the end faces of the latter, the upper extremity of each upright member being turned to penetrate for a substantial distance into its respectively proximate slab section in a substantially horizontal direction to provide firm anchorage and enable the upright members aforesaid to function as tension straps in the transverse transmission of applied loading on the surface of the pavement, and a vertically-extending corrugated member disposed between said upright members and terminating short of the surface of the pavement, said last named member being adapted to form a predetermined cleavage line in the pavement under contraction conditions.

3. A joint for concrete pavement and the like, comprising a unitary base member adapted to underlie the joint and extend in opposite directions for a substantial distance beneath each slab, a pair of integral upright members carried by said base member so as to extend upwardly in substantial parallelism within the slab sections respectively adjacent each of the end faces of the latter, the upper extremity of each upright member being turned to penetrate for a substantial distance into its respectively proximate slab section in a substantially horizontal direction to provide firm anchorage and enable the upright members aforesaid to function as tension straps in the transverse transmission of applied loading on the surface of the pavement, and a verticallyextending flexible member disposed between said upright members and terminating short of the surface of the pavement, said last-named member being adapted to form a predetermined cleavage line in the pavement under contraction conditions.

4. A joint for concrete pavement and the like, comprising a unitary base member adapted to underlie the joint and extend in opposite directions for a substantial distance beneath each slab, a pair of integral upright members carried by said base member so as to extend upwardly in substantial parallelism within the slab sections respectively adjacent each of the end faces of the latter, the upper extremity of each upright member being turned to penetrate for a substantial distance into its respectively proximate slab section in a substantially horizontal direction to provide firm anchorage and enable the upright members aforesaid to function as tension straps in the transverse transmission of applied loading on'the surface of the pavement, and a verticallyextending corrugated flexible member disposed between said upright members and terminating short of the surface of the pavement, said lastnamed member being adapted to form a predetermined cleavage line in the pavement under contraction conditions.

ALAN E. BRICKMAN.