US2283787A - Pavement joint - Google Patents

Description

May 1,9, 1942. A1 E. BRICKMAN 2,283,787

Y PAVEMENT JOINT l Filed Nov. 19, 1940 2 sheets-sheet 1 ff ff 7/ 1 May 19, 1942.

A. E. BRICKMAN PAVEMENT JOINT 2 Sheets-Sheet 2 Filed Nov. 19, 1940 Patented May 19, 1942 PAVEMENT JOINT Alan E. Brickman, Monongahela, Pa., assignor to The American Steel and Wire Company of New Jersey, a corporation of New Jersey Application November 19, 1940, Serial No. 366,307

Claims.

This invention relates to pavement joints, and more particularly to those which are used in Y paving to compensate for the expansion and contraction thereof. Pavement joints of the type described are nd ing extremely wide usage, but are subject to several deleterious factors and consequently frequently present difficulties.

For a satisfactory pavement joint ofthe type to which the present invention appertains, attention is directed to Patent No. 2,201,823, dated May 21, 1940.

It is an object of the present invention to provide a joint for paving which overcomes disadvantages of the devices of the prior art.

Another object is to effect better surface align- `ment of one pavement slab with the adjacent slab in the pavements cycles of expansion, contraction, warping, internal stress, subgrade variations, and wheel load.

A further object is the provision of a device of the class described which is relatively easy and inexpensive to manufacture and install, and one which is at the same time very ecient and durable in service.

The foregoing and other objects will become apparent after referring to the drawings, in which:

Figure 1 is a side elevation of the device of the present invention showing parts thereof in section:

Figure 2 is a plan;

Figure 3 is a view similar to Figure 1 but showing the relative positions of the parts of the device of the present invention when the adjacent paving slabs have moved closer together;

Figure 4 is an end elevation;

Figure 5 is a perspective of a detail;

Figure 6 is a perspective of another detail.

Referring more particularly to the drawings, the numeral I generally designates the base member of the pavement joint of the present invention. More specically, the base member I takesv the form of a malleable iron or steel member having oppositely disposed extensions 2. 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. As shown more clearly in Figures 1 and 3, the adjacent faces of the uprights 3 immediately below the reversely curved portions 4 provide rod-receiving recesses 6, the function of which will be described hereinafter. The upper ends of the complemental vertical extensions carry oppositely extending horizontal portions 8 which are adapted to be imbedded in the adjacently disposed paving slabs which the joint of the invention is adapted to connect. At the upright ends of the complemental vertical extensions 5, and on opposed adjacent surfaces thereof, there are provided rodreceiving recesses 9 which are similar to the rodreceiving recesses 6.

On each of the remote sides of the vertical uprights 3, reversely curved portions 4 and complemental vertical extensions 5, there is carried a compressible element II which is provided with a cut-out portion I2 for straddling theadjacent extensions 2 of the base member. These compressible elements II also provide reversely curved portions I3 for conformity with the reversely curved portions 4 of the uprights 3, and tapered upper portions I4, one face of which contacts for a substantial distance the adjacent surfaces of the vertical extensions 5.

'I'hrough each of the rod-receiving recesses 6 and 9 there is disposed to extend a rod I8, each rod I8 being held in position by a U-shaped wire clip 2li having at each of its ends a curved portion 2| for embracing the said rod. The U- shaped wire clips120, for embracing the lower of the rods I8, are disposed around the compres'- sible elements II adjacent the bases of the tapered portions I4 thereof.

'Ihe wire clips 20 for the upper rods I8 are similar in shape to those previously described and indicated by the same number, but in lieu of embracing a compressible element in the manner previously described, are adapted to embrace raised portions 24 which are integrally formed on the upper surfaces of the horizontal extensions 8 which are carried by the complemental vertical extensions 5 of the base member I.

Extending between the adjacent faces'of the complemental vertical extensions 5 of a series of aligned base members I is a compressible element 26. In installation, a single compressible element 26 is disposed to extend entirely across the roadway, and embodies cut-out portions 21 for straddling the mid-portions of the series of aligned and suitably spaced base members I.

In order to initially secure the joint assemblies on a prepared subgrade so as to span the distance between the pavement lane forms, the remote ends of the extensions 2 of the base member I carry compressible elements 30 having on their inner ends U-shaped staples 3|, the legs of the latter extending through` the compressible elements 30 and being bent at right angles, as shown at 32. Adjacent the remote ends of the extensions 2, each is provided with a vertical aperture.

the width of the pavement in the manner of the compressible element 26. The compressible element 26 is generally composed of asphalt saturated felt, rubber, cork board or corn stalk composition, and is stffened longitudinally to withstand installation handling and the flow of the poured concrete by the rods I8. These rods I8 also secure the plurality of base members I (which, for example, may be ve in number extending across the pavement) in unit assembly with he compressible element 26.

After the pavement joint has been installed and the concrete or other paving material poured, the construction and arrangement is such that with a rise in temperature the adjacent slabs expand so as to move on the-subgrade. This movement is unrestricted as the compressible element 26 and mastic seal 38 are compressed. Similarly, the compressible elements 30 at the remote ends of the extensions 22 of the base member I are compressed. The compressible elem. its II on the remote sides of the vertical extensions 5 also provide for unrestricted movement of the adjoining portions of the pavement slabs, where otherwise the latter would tend to shear the vertical uprights from the base member I. 'I'he compressible elements II and the compressible element 26 permit the complemental vertical extensions 5 to bend or flex.

The expansion of the adjacent paving slabs breaks any initial bond which may take place between the said slabs and the exposed surface of the base member I and its component elements, thus providing a riding surface for repeated cycles of movement of the slabs.

The function of the device of the present invention in transferring the trafc load from the cnd of one paving slab to the next paving slab is as follows:

As the trac load is established adjacent the end of one of the 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 equal to the thickness of the compressible element 26 diverts this force into tension on 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 traic load moves across the mastic seal 38 and on to the next paving slab, the forces are reversed in ccmplemental function.

While I have shown and described one specic embodiment of the present invention, it will be understood that I 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 appended claims.

I claim: 1. 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 between the slab sections respectively adjacent each of the end faces of the latter, the upper extremity of each upright member being turned to penetrate into its respectively proximate slab section in a substantially horizontal direction, a compressible element at each of the oppositely extended ends of said base member, a compressible element between said upright members, and a compressible element between each of said upright members and the respectively proximate slab section.

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 o1' integral upright members carried by said base member so as to extend upwardly in substantial parallelism between the slab sections respectively adjacent each of the end faces of the latter, the upper extremity of each upright member being turned to penetrate into its respectively proximate slab section in a substantially horizontal direction, a compressible element between said upright members, a compressible element at each of the oppositely extended ends of said base member, a compressible element between each of said upright members and the respectively proximate slab section, and means for initially holding said base member in position.

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 between the slab sections respectively adjacent each of the end faces of the latter, the upper extremity of each upright member being turned to penetrate into its respectively prximate slab section in a substantially horizontal direction, a compressible element between said upright members, a compressible element at each of the oppositely extended ends of said base member, a compressible element between each of said upright members and the respectively proximate slab section, and means for holding said last-named compressible elements in position.

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 between the slab sections respectively adjacent each of the end faces of the latter, the upper extremity of each upright member being turned to penetrate into its respectively proximate slab section in a substantially horizontal direction, a compressible element between said upright members, a compressible element at each of the oppositely extended ends of said base member, and a compressible element between each of said upright members and the respectively proximate slab section, said firstnamed compressible element extending substantially the entire width of the pavement.

5. A joint for concrete pavement and the like,

tively proximate slab section in a substantially l0 horizontal direction, a compressible element between said upright members, a compressible` element at each of the oppositely extended ends ot said base member, a compressible element between each o! said upright members and the respectively proximate slab section, and a rod carried by at least one of said integral upright members and projecting from either side therof.

ALAN E. BRICKMAN.

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