US2768562A - Dowel apparatus for paving joints - Google Patents

Description

Oct. 30, 1956 w. s. GODWIN 2,763,552

DOWEL APPARATUS FOR PAVING JOINTS Filed Aug. 19, 1952 2 Sheets-Sheet l 1N VENTOR M; 1)? .9. scary/xv,

' RNEYs.

Oct. 30, 1956 w. s. GODWIN nowrzr. APPARATUS FOR PAVING JOINTS 2 Sheets-Sheet 2 Filed Aug. 19, 1952 INVENTOR ML/fl/V 6.600140% M VW ATTORNE Y5 United States Patent 2,768,562 DOWEL APPARATUS FOR PAVING JOINTS William S. Godwin, New York, N. Y. Application August 19, 1952, Serial No. 305,245" 6 Claims. (Cl. 94-8) The invention relates to dowel apparatus for paving joints and more especially to apparatus for simultaneously holding a plurality of parallel dowels and, if desired, a joint forming member across a joint in a pavement.

The primary object of the invention is to provide an inexpensive arrangement of light weight and low cost for rigidly holding joint dowels in position during the laying of a pavement.

A second object of the invention is to provide such an arrangement which has the further functions, after the paving is completed, of transmitting stress from the dowels upwardly and downwardly into the concrete on each side of the joint and of reinforcing the concrete body transversely of the pavement.

Another object of the invention is to provide an arrangement of this type which makes it possible to obtain greater joint capacity and less joint elasticity while using less steel than similar devices heretofore available.

A further object of the invention is to provide an arrangement which requires less labor in assembly and installation than was heretofore necessary.

Still another object of the invention is to provide a unit of this type which is sufficiently rigid to be supported at the side forms only, and still to resist the loads and stresses to which it is subjected during the laying of the pavement. Under these conditions, uneveness in the subgrade between the two side forms has no effect on dowel alignment. Because of the resiliency of the construction, if it should be subjected to deformation, before the concrete sets, it will return to its proper position as soon as the deforming force is removed.

An additional object of the invention is to provide an apparatus of this type which is in effect a duplex truss, which both adds rigidity during the pouring of the concrete and aids in absorbing and distributing loads and shocks in the completed pavement.

Still another object of the invention is to provide an arrangement which can be used with standard side forms.

A further object of the invention is to provide steel-onsteel line contact bearings for the dowels.

Still a further object of the invention is to provide an arrangement in which the supports for the assembly can be removed after the setting of the concrete and truss recovered for reuse.

An additional object of the invention is to provide, in such an arrangement, a simple, light, inexpensive and eflective means for holding a road joint forming member, such as a removable contraction joint form, in proper alignment with the dowels during the pouring and setting of the concrete.

Further objects and advantages of the invention will appear more fully from the following description, especially when taken in conjunction with the accompanying drawings which form a part thereof.

In the drawings:

Fig. 1 shows in perspective a dowel apparatus embodying my invention;

Fig. 2 is a side elevation thereof the holder for the joint member being omitted;

Fig. 3 is a top plan view thereof;

Fig. 4 is an end view, showing also a road joint form holder;

Fig. 5 is an enlarged end view of such holder;

Fig. 6 is an enlarged side view thereof; and

Fig. 7 is a cross-section on the line 7-7 of Fig. 4.

Fig. 8 shows a procedure used in laying parallel strips.

The dowel holder according to the invention is made up of two opposed elements, each to lie on one side of the joint. Each element includes an upper bar 2 and a lower bar 4, parallel to each other and intended to lie crosswise of the paving or parallel to the joint.

Welded to each upper bar 2 are a plurality of generally U-shaped members formed by bending a round bar and indicated at 6, while other U-shaped members 8 are welded to each of the lower rods 4. The members 6 attached to the bar 2 lie in a single plane, While the members 8 likewise lie in a single plane. These two planes.

intersect, so that the bights of any two members 6 and 8 form between them a substantially circular opening for receiving a dowel 10.

As shown in Fig. 7, the bights of the upper member 6 are of less radius of curvature than those of the lower members 8. The two are welded together at the point of intersection as at 12, the outer sides of the members 6 being secured to the inner sides of the members 8.

There are also provided removable socket forming devices composed of short U-shaped members 14 and somewhat longer U-shaped members 16, the latter having clip ends as at 18 which are adapted to engage over the outside of the bights of the members 6, 8. The parts 14 and 16 are welded together at their intersection 20, and thus form a removable dowel holding socket attached in alignment with the dowel openings formed by the bights of the members 6, 8.

In the use of the arrangement so far described, two units each formed by an upper bar 2, a lower bar 4 and a plurality of the members 6, 8 provided with the dowel sockets 14, 16 are assembled together and in opposed relation to each other with the dowel 10 extending between them. The lower bars 4 are inserted at each end into a block 22 which may be formed of wood. A rubber band 24 is applied around the outer dowel 10 on each end and around the block 22 so as to hold the block in engagement with the ends of the bars 4.

The unit so formed is quite rigid and self-sustaining, and will bear a considerable weight on the dowels. It in etfect forms a double truss arrangement which is of com siderable strength and rigidity.

In the formation of a pavement, this unit is used with standard side forms such as 26. The whole unit is placed at an angle to the line of the intended joint and is then turned so as to engage the blocks 22 beneath the inward projections 28 of the side forms 26. The whole unit is then held rigidly in position between the side forms, and is supported only by the blocks 22. Thus any inequalities in the subgrade between the two side forms have no effect on the unit and will not cause misalignment or misplacement of the dowels.

When the concrete is poured and hardened, the 'members 6, 8 form rearwardly and outwardly extending arms which, by virtue of their three point connection with the dowel, will transmit the load on each dowel through the truss structure. They will also transmit this load to the rods 2, 4 which serve as reinforcing rods.

When the side forms are removed, the rubber bands 24 can be cut and the blocks 22 pulled off the ends of the bars 2 for reuse.

In the making of a contraction joint, it is also desirable to provide a support for a joint forming member.

Patented Oct. 30, 1956.

This is accomplished as shown particularly in Figs. 4 to6 by the use of supports each'c'omposed of a'rod or bar bent to form an upwardly open U-shaped portion 30 and having lateral extensions 32 provided at their ends with hooks 34 which engage. around the upper bars 2. In addition, a piece 38 is'w'elded at 36 to'the bottom of the U-shaped portion 30 in a plane at right arigle's to the'plan'e of the portion 30 and having ends adapted to rest on one of the dowels 10. As many of these may be used as are needed to give'proper support to a joint forming member 40 which fits into the U-shaped portion 30 and is supported thereby.

Ingeneral, in thefuse of this device, one of the parts composed of a rod 2, a rod 4 and a plurality of members 6, 8 with dowel sockets attached is laid on a suitable surface with the rods 2 and 4 in a common horizontal plane and the dowel sockets upwardly open. Dowels are dropped in these sockets with rubber bands on the first and last dowels. A similar unit is then dropped ontop of the dowels. The wood supports 22 are then pushed through the rubber bands and the holes provided in them are fitted into the rods 4. (It may also be desirable, where the joint form support is not used, to connect the upper bars 2 at each end by a pair of rubber bands.) The assembled unit is placed on the subgrade between two side forms, 'at something of an angle to the angle of the joint, "and is then turned to fit the blocks 22 underneath the projections 28 of the side forms. The contraction joint forming member supports, if they are to ,be used, are connected across the bars 2 and'caused to rest on the dowels and the contraction joint 'forming member is placed in position.

At this time, the concrete is poured and allowed to set. At 'the'proper time, the contraction joint forming member .40 is raised by means of hooked levers 42 about one inch above the surface and used as a guide for an edging tool. It is then removed, and in due course the joint is filled with hot joint'filler.

In the finished road strip, the portions of the lower rods 4 which were inserted into the blocks 22 will project somewhat from the concrete, as shown in Fig. 8. Inlaying parallel strips, the truss unit of the next strip canbe supported at the end next to the completed strip by-putting sleeves '42 on the projections of bars'4, and inserting the ends of bars 4 of the next unit into these sleeves, as shown in Fig. 8.

The arrangement of Figs. to 7 may also be mounted on the bottom bars 4 in inverted position to hold a joint forming member on the sub-grade.

While I have described herein one embodiment of my invention, I wish it to be understood that I do not intend to'be limited thereby except within the scope of the claims hereto or hereinafter appended.

I claim: I

1. A dowel apparatus for paving joints, comprising two elements each composed of a pair of elongated members arranged in parallel vertically spaced relation and adapted to be arranged across a paving section at different levels, a plurality of generally U-shaped parts having their legs permanently and rigidly attached to the members at spaced points therealong, the parts attached to one member lying in a plane forming a substantial angle with the plane of the parts attached to the other member, the bights of the parts attached to one member overlapping the bights of the parts attached to the other member and the parts being permanently and rigidly secured together at the intersection of such planes, whereby to form a plurality of dowel receiving openings spaced longitudinally along said members, and means connecting the lower elongated members of said elements in spaced relation with the dowel receiving openings of one member opposite those of the other member.

2. In a device as claimed in claim 1, dowels arranged in said openings, said dowels together holding said elements in a unitary whole.

3. In a device as claimed in claim 2, means resting on said dowels and connecting the upper members of each of said elements being provided with means to support a joint forming member.

4. In a device as claimed in claim 1, dowels arranged insaid openings, said dowels together holding said elements in a unitary whole, a joint forming member support having an upwardly open bend therein, and having a downward extension from the bottom of the bend resting on a dowel and lateral extensions connected'to the upper elongated members of said elements.

'5. In a device as claimed in claim 4, one of each opposing [pair of parts having a bight of less radius of curvature than the other, the outside of the part having the bight of less radius being secured to the inside of the other part.

6. In a device as claimed in claim 1, one of each opposingpair of parts having a bight of less radius of curvature than the other, the outside of the part having the bight of less radius being secured to the inside of the other part.

References Cited in the file of this patent

Images