US2207085A - Hinge dowel for transverse joints of concrete roadways and the like - Google Patents

Description

A. E. BRICKMAN 2,207,085

NOV- 23, 3 sheets sheet l Za M4N, ib/776g [naw/fors LfQ/v E BE/CK July 9, 1940.

HINGE DOWEL FOR TRANSVERSE JOINTS OF CONCRETE ROADWAYS AND THE LIKE A; E. BRICKM AN July 9, 1940.

HINGE DOwEL Eon TRANsvERsE-JOINTS 0F CONCRETE RoADwAYs AND THE LIKE Filed Nov. 23, 1958 .3 Sheets-Sheet 2 [Ewenfo:

4m/v E, 5

A. E. BRICKMAN July 9, 1940.

HINGE DOWEL FOR TRANSVERSE JOINTS OF CONCRETE BOADWAYS AND rfHElhlllfE Filed Nov- 23, 193s 5 Sheets-Sheet 5 Il l HNHNNWII UAA/v VE. 5E

Patented July 9, 1940 UNITED STATES PATENT OFFICE HINGE DWEL FOB TRANSVERSE JINTS F CONCRETE ROADWAYS AND THE LIKE Alan E. Brickman,

Rostravor Township, West- Application November 23, 1938, Serial No. 242,11

6 Claims. (Cl. 94-18) The present invention relates to dowelng devices for transverse .joints of concrete highways.

An object of the present invention is the provision of a hinged dowel member which will permit free movement of the pavement slabs in expansion, contraction or curling.

A further object of the present invention is the provision of a dowel device formed from castings and assembled so as to provide a hinged action at the transverse joint.

Other objects and advantages will become a'p'- parent as the description proceeds and reference is had to the accompanying drawings, in which:

Figure 1 is a sectional plan through a transverse joint, showing the dowel device of the present invention in elevation with a portion thereof in section to show the hinged connecgon between the members forming the dowelng device;

Figure 2 is a sectional side elevation of the dowel in position at a transverse expansion joint of a concrete highway;

Figure 3 is a view similar to Figure 2, only showing the position of the dowelng device under contraction due to the expansion of the concrete slabs; l

Figure 4 is a view similar to Figure 3, showing the relationship between the elements forming the hinge dowel device where expansion takes place at the top surface of the concrete slabs in advance of the bottom surface; and,

- Figure 5 is a detailed elevation showing the method of assembling the hinge dowel device. v

In the drawings, the dowel device of the present invention comprises generally three malleable iron castings designated generally at A, B, and C. These castings, when assembled to produce the hinged dowelng action, are positioned through a conventional joint filler E and embedded within the concrete slab sections.

'I'he member A forming one part of the dowel assembly may,for the sake of convenience, be

designated as a hinge housing" comprising a body portion 2 from which extends, at right angles to the main plane of said body portion, spaced horizontally positioned arms 3, which are provided with nubs 4 in order to secure better distribution of stresses and provide means for holding this hinge housing A in the concrete bond. This main body portion 2 is provided with a beveled portion 5 favorable to the flow of wet concrete and eliminates the danger of forming voids. Extending laterally from the main body portion 2 are ears 6.

The member B may, for the purpose of convenience, be designated the fdowel member, and

comprises a diametral portion 1 having outwardly extending bosses 8 with bearing edges Q ex-` tending Vrearwardly from said diametral portion 1 and adapted to be slidably positioned within themember C which, for convenience, has been designated as the dowel socket.

'I'he dowel socket comprises a body portion I0 having rearwardly extending ribs II, which ribs diverge inwardly toward each other and terminate in nubs I2 in order to hold said dowel socket in the concrete bond. vUpon the top surface of said dowel socket, at a point rearward of said main body portion I0, there is provided an upwardly extending nub I3 to assist in maintaining said dowel socket bonded within the concrete. This dowel socket is so constructed and arranged as to provide a central opening within which is slidably positioned the dowel member B so that the bearing edges 9 of said dowel member B slidably engage the inward projections I4 formed upon the inner surface of said dowel socket. A tap-hole is provided upon the upper surface of said dowel socket to receive a set-v screw I5 for holding the doweling device in initial assembly prior to the pouring of the concrete.

'A ller member I6, of cork or other compressible material, forms a closure for the open end of the dowel socket C.

A filler block I1 of conventional design is provided with the necessary cut out portions to permit extension of the dowel therethrough.

`In assembling the present dowelng device, the dowel B is inserted through the main body portion 2 of the hinge housing a suiiicient distance to permit the diametral portion 'I to extend on the other side of vthe main body portion 2 of the hinge housing. A coating of paint or the like material is applied t0 the surface of said diametral member I prior to insertion of said member into the main body portion 2 of said hinge housing in order to form a cleavage action for the assembly and assure free working hinge action after bonding in the concrete. The diametral portion I having been positioned in the hinge housingythe ears 6 are bent down from their dotted line position, as shown in Figure 5, to the full line position so as to securely retain the diametral head portion 'I within the hinge housing. The dowel B is then passed through the aperture formed in the compressible joint ller I1 and into the dowel socket C so that the bearing edges 9 slidably engage the inward projections I4 formed on said dowel socket. 'Ihe set-screw is then tightened to bear upon the bearing edge 9 of said dowel so as to initially maintain the assembly with suiiiclent rigidity to withstand handling and pouring of the `concrete. 'Ihe setscrew, however, will yield. to the high expansion and contraction forces of the concrete aiter'setting and thereby permit the hinge action of the doweling device to function upon expansion and contraction of the concrete slabs.

'Under the present day practice of concrete highway construction, observation tests and physics have disclosed that temperature changes on the exposed surface of the roadway cause expansion and contraction of the top surface of the roadway which may diier greatly from the expansion and contraction of the bottom or under surface of the roadway.

Due to this variation in the degree of expansion and contraction between the top and bottom surfaces of the roadway, action is set up between the slabs which results in slab curling. While the weight of the concrete pavement generally overcomes this curling action, it does so with the detrimental result of setting up high stresses which are relieved only by objectionable cracks. At transverse joints in concrete roadways where the slabs and reenforcement end, curling will take place if the doweling means does not have sufficient rigidity to restrain the same. Under the present construction, these defects are overcome due to the hinged doweling means at the transverse joints which permit end curling and relieve these objectional stresses.

While I have shown and described a specic embodiment of the present invention, it will be seen that I do not wish to be limited exactly thereto, since various modications may be made without departing from the scope of the invention, as dened by the following claims.

I claim:

1. In a transverse joint ior concrete highways, means permitting free movement of the pavement slabs during expansion and contraction of the pavement slabs at the joint, said means comprising a housing embedded in a concrete slab, a dowel receiving socket embedded in an adjoining concrete slab and a dowel hingedly connected to said housing and slidable within said dowel receiving socket.

2. A doweling device for transverse joints of concrete roadways comprising a housing, 'a dowel member and a dowel socket, said dowel member hingedly connected to Said housing and slidable within said dowel socket.

3. A doweling device for transverse joints of concrete roadways comprising a housing, a dowel member and a dowel socket, said dowel member hingedly connected to said housing and slidable within said dowel socket, said dowel socket provided withmeans for holding the doweling device in initial assembly prior to the pouring of the concrete.

4. A doweling device for transverse joints of concrete roadways comprising a housing, a dowel member, a dowel socket, said dowel member hingedly connected to said housing and slidable within said dowel socket, said dowel socket provided with means for holding the doweling device in initial assembly prior to the pouring of the concrete and means on said housing and dowel socket for anchoring said doweling device in the concrete.

5. A transload device for expansion and contraction joints comprising, in combination with a joint ller, a. housing embedded in a concrete slab, a dowel hingedly supported by said housing and extending through said joint filler and a dowel receiving socket member embedded in the adjoining concrete slab for slidably receiving the dowel member.

6. A transload device for expansion and contraction joints comprising, in combination with the joint` filler, a housing embedded in a concrete slab of the roadway, a dowel member hingedly supported in said housing and a dowel socket member embedded in the adjacent concrete slab of the roadway, said dowel extending through the joint ller and into slidable contact with the dowel receiving socket to provide a hinge and slidable movement between said transload elements to Simultaneously compensate for slab end curling and expansion and contraction of the adjoining concrete slabs.

ALAN E. BRICKMAN.

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