US1460841A - Contraction joint for roadways - Google Patents

Description

-July 3, 1923. 1,460,841

B. BRIODY CONTRACTION JOINT FOR ROADWAYS Filed Aug. '7 1922 Patented July 3, 1923.

UNITED sTATEs I I 1,460,841 PATENT OFFICE.

BERNARD BRIODY, F CHICAGO, ILLINOIS, ASSIGNOR TO TRUSCON STEEL COMPANY, 0F YOUNGSTOWN, OHIO, A CORPORATION OF MICHIGAN.

CONTRACTION JOINT FOR ROAIDWAYS.

Appucamn mea august 1, 1922. semina. 580,299.

To all whom t may camera.'

Be it known that' I, BERNARD BmoDY, a citizen of the United States, and residing at Chicago, in the county of Cook and State of Illinois, have `invented a new and Im' .proved Contraction Joint for Roadways, of

which the following is a specification.

This invention relates to concrete roadways and especiallyto means for preventing lo the pavement from breaking along irregular lines, and its object is to provide means which will divide the concrete roadway slabs in such a manner that they will separate along straight and predetermined lines, and

to provide means to prevent water filling the cracks should the slab break along the predetermined lines.

This invention consists of a strip of metal or other stiif material permanently embedded vertically in and extending longitudinally or transversely of a concrete roadway. as may be desired, and being of less depth than the concrete slab and having its upper edge a distance below the upper surface of the slab, together with a removable strip positioned vertically above the permanent strip and extending down from the upper surface of the slab to the upper edge of the permanent strip.

It further consists in forming the removable member by folding a strip of sheet metal longitudinally to constitute a channel and forming one or both sides of the channel with inwardly extending lugs which space the sides and which engage the upper edge of the permanent strip and support the removable strip.

It also consists in longitudinally corrugatf ing the permanent strip in order to provide a' tongue-and-groove joint between adjacent ed es of the two sections of the roadway sla and in providing rods for holding this dividing member in upright position while the concrete is being laced around it.

It also-embraces t e process of constructing a roadway slab which consists in moulding concrete around a dividing member as above described until the upper surface of the concrete is flush with the upper edge of the upper removable member, and after the concrete has its initial set, removing the upper member and replacing it with a plastic material such as asphalt, tar or the like to revent the entrance of water should the adjacent slabs separate.

It also consists in the details of construct1on lllustrated in the accompanying drawmg Aand particularly pointed out in the claims.

v In the d rawing, Fig. 1 is a plan `of a roadway provlded with transverse contraction jolnts. Fig. 2 is a side elevation of a removable portlon of the contraction joint embodymg the present invention. Figs, 3 and 4 are sections on the lines 3--3 and 4 4 of Fig. 2. Figs. 5 and 6 are vertical sections of a roadway at right angles to one of these lmproved contraction joints, Fig. 5 showing thepermanent and removable parts of the divldmg member in position, and Fig. 6 showing the removable member replaced by asphalt. Fig. 7 is a side elevation and Fig. 8 a cross section of a modified form of removable member.

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

A s also shown in my prior application Serlal Number 538,546, filed February 23, 1922, the roadway 1 is formed by spreading a layer of concrete 3 over the sub-base 4 in the usual manner. Embedded inthe concrete longitudinally or transversely of the roadway is a strip formed from sheet metal, paper or other stiff material with vertical portions 5, 6 and 7 and inclined portions 8 and 9. These corrugated strips may be made of several pieces, if desired, the ends of the sections overlapping, Holes may be made in the inclined portions 8 and 9 to receive the pins or stakes 10 which position and sutpport these strips until the concrete has se If there is any movement of the roadway by reason of frosts or otherwise, a crack will be formed along'above this strip, but the tongues 13 along the edge of one slab of concrete extend into the channel formed in the adjacent edge of the other slab by means of the parts 8, 6 and 9 of the strip, and this tongue-and-groove joint will cause the upper 10o surface of the roadway to remain flat and to return to its original position after the cause of the movement has passed. The shape of the channel is immaterial so long as the interlock is provided.

When a crack is formed in the roadway as just described, water is liable to enter and freeze during cold weather, resulting in the destruction of adjacent parts ofthe roadway. To prevent this, a groove is formed 11o in the roadwa by means of a removable strip, preferab y of greater width than the upper edge 12 of the permanent strlp just described. This removable device is preferably inthe form of a channel 13 having sides 14 from which the lugs 15 may be struck up to fspace vthe sides of the channel and to rest on the upper edge 12 of the permanent strip. Just after the concrete has a permanent set, this strip is removed and a plastic material 16 such as asphalt, tar or the like is run into the groove left by the removal of the channel. This plastic material will fill this groove at all times and prevent the entrance of water.

Instead of a channel, this removal member may be formed of two strips 17 spaced by a narrower strip 18 and held together by the rivets 19. The narrow strip 18 and the rmanent stri determine the thickness of t e concrete sla The details of these metal members and their proportions may all be varied by those skilled in the art, without departing from the spirit of my invention as set forth in thev following claims.

I claim v 1. A dividing member for separatin adjacent slabs of concrete roadways an the like consisting of a permanent strip extending upward from the lower face of the concrete roadway and a removable part extending from the upper surface of the roadway downward to the permanent part.

2. A dividing member for separating adjacent slabs of concrete roadways and the like consisting of a permanent strip extending upward from the lower face of the concrete l roadway and a removable part extending from the upper surface of the roadway downward to the permanent part, said removable part consisting of a strip of sheet metal folded to form a narrow channel.

3. A dividing member for separatin adjacent slabs of concrete roadways an they ike consisting of a permanent strip extending upward from the lower face of the co-ncrete roadway and a removable part extending from the upper surface of the roadway downward to the permanent part, said removable lpart consisting of a strip of sheet metal fo ded to form anarrow channel, the sides of the channel having projections on their inner faces adapted to space the sides and to rest on the upper edge of the permanent member. 4. A dividin member for separatin adjacent slabs of concrete roadways an the ike consistin of a permanent stri extending upward om the lower face o the concrete roadway and a removable art extending from the up er surface of t e roadway downward to t e permanent part, said removable part, consisting of a strip of sheet metal folded to form a narrow channel and said permanent strip bein longitudinally corrugated, and bars exten lng through the permanent strip into the foundation of the roadway.

5. A dividing member for separatin ladjacent slabs of concrete roadways an the.

like consisting of a permanent strip extending upward from the lower face of the concrete roadway and a removable part extending from the uplper surface of the roadway downward to t e permanent part, said removable art consisting of a strip of sheet metal fol ed to form a narrow channel, said l permanent strip being channel shaped and j y formed with vertical alined holes in the walls of the channel, and supporting stakes in saidvholes to hold the strips in position until embedded in the concrete. l

6. The process of making aA contraction joint in a concrete roadway or the like which consists in embedding a permanent metal strip in the lower part of the concrete slab and embedding a removable separator in the upper part of the slab in vertical alinement with the lower strip and extending from the upper surface of the slab to the lower strip, and 'replacing thel removable separator with an elastic material after the concrete has set.

' BERNARD BRIODY. Witnesses:

E. H. DAVIS,

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