US1178700A - Pavement-joint. - Google Patents

Description

' R. D. BAKER. PAVEMENT JOINT. APPLICATION. FILED 1150.21.1915.

LWfifiQO. "Pater med Apr.l1,1916.

fiaberlga z er attomugg ROBERT D. BAKER, or'nn'fnorr, MICHIGAN.

PAVEMENT-JOINT.

' Specification of Letters Patent.

Original application filed May 13, 1912, Serial No. 696,990. Divided and this application filed December 21, 1915. Serial No. 68,048.

To all whom it may concern:

Be it known that I, ROBERT D. BAKER, a citizen of the United States of America, re-

. siding at Detroit, in the county of Wayne 5 and State of Michigan, have invented certain new and useful Improvements in Pavement-Joints, of which the followlng 1s a specification, reference being had therein to,

the accompanying drawlngs. j.

The invention relates to pavement oints,

and consists in the novel construction of an armor plate for protecting the edges of the pavement at the joints, and in certain ar-' rangements and combinations of parts as will more fully hereinafter appear.

As my invention is peculiarly adapted for use in concrete pavements, I will illustrate and describe the invention in connection with such a type of pavement.

In the drawings :,Figure 1 is a sectional perspective View .of a portion of a pavement embodying the invention; Fig. 2 is a sectlon on the line a2m of Fig. 1; and Fig. 3 1s a fragmentary perspective view of the armor plate. I

The use of concrete for constructing the pavements I find offers many advantages, among which is durability. However, experience has shown that expanslon oints should be provided at regular intervals to allow for expansion and contraction, due to variations in temperature. It is also found that unless suitably protected, the edges of such joints become worn down by the abrasions incident to traffic and weathering, causing ruts which increase in depth and width with the continuous use of the pavement. To remedy this difiiculty I protect the edges of the expansion joints by a novel construction of armor plate.

In forming-concrete pavement the concrete mixture A is poured or otherwise suitably placed upon a suitable sub-grade B of earth. The concrete or pavement proper is divided at suitable intervals, say 25 feet, by joints or spaces forming sections. These joints or spaces preferably extend uninterruptedly from side to side of the roadbed and permit of independent contraction and expansion of the sections. Preferably the joints or spaces are filled with asphalt, tar or the like. In order to protect the edges of the concrete sections at the joint, metal plates (7 are set into the concrete at the oint.

Instead of forming the armor plate fiat on that side of the plate which engages the concrete, I. have so constructed the plate that its inner face at the upper edge makes an obtuse angle with the upper surface of the section which edges it protects. This type of plate is particularly useful where the pavement is subjected to exceedingly severe traffic conditions, since it reduces to a minimum the possibility of the concrete breaking away or otherwise separating from the upper edge of the plate, thereby preventing trafiic wearing a groove in the surface of the concrete at the junction of the upper edge of the plate and the pavement material.

Referring more in detail to the structure illustrated in the drawings, the plate C has a flat body portion with an overhanging ledge D formed along its upper edge on the inner side of the plate, that is-the side of the plate next to the concrete. The top E of the plate is flat so as to be flush with the top surface F of the pavement material. while the lower face G of the overhanging ledge D is beveled to insure a bevel or ob tuse angle on the upper edge H of the concrete. In the structure shown the outer face I of the plate is flat, and the top E of the .is temporarily arranged a division plate which acts to form the joint or space be tween adjacent concrete sections. The

armor plates and the division plate therebetween are suitably held in proper relation to each other and to the roadbed and then the concrete is placed upon the roadbed so that the upper surface thereof is flush with the tops E of the plates and the latter embedded in the concrete. After the concrete. has set sufficiently the division plate is removed and the space between the sections filled with asphalt, tar or other suitable compressible material, which will allow for expansion and contraction of the concrete section's.

It will he 'evidentthat the manner of forming the pavement may be varied as desired, and that While the plates are peculiarly adapted for reinforcing or protecting the edges of concrete pavement at the joints thereof, that the plates are capable of other uses.

lVhat I claim as my invention is 1. Means for protecting pavement joints, comprising a'pair of armor plates arranged. on edge and in parallel with their adjacent faces in relatively close mutual proximity,

the outer or adjacent faces of said plates being plane and vertical, while the upper portions of the inner or non-adjacent faces flare obliquely to form thickened wearing edges.

2. The combination with adjacent pavement sections, of parallel armor plates protecting the edges of the joint between said sections, each ofthe inner or non-adjacent faces of said plates making an obtuse angle vwith the upper surface of the section whose edge it protects.

3. The combination with adjacent pavement sections, of parallel armor plates protecting the edges of the joint between said sections, each of the outer or non-adjacent faces of said plates making an obtuse angle with the upper surface of the section whose edge it protects, and the inner or adjacent faces of the plates being plane and vertical. 4. A reinforcing plate for the edge of a body of concrete comprising a flat plate, means to secure this plate against the side of the body of concrete with its outer face vertical, and an overhanging ledge formed along the upperedge of the plate on the side next to the concrete to protect the edge of the concrete, the lower edge of said ledge being beveled so as to insure an obtuse angle on the concrete, and the entire top of the plate being flush with the concrete and forming a right angle with the outer face of the plate.

-5. A reinforcing plate for the edges of expansion joints between sections of concrete roadways, comprising a vertical plate having a flat body portion with a flat outer side and a short overhanging ledge formed along its upper edge on the side next to the con-

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