US2130859A

US2130859A - Road expansion joint

Info

Publication number: US2130859A
Application number: US71572A
Authority: US
Inventors: Robert R Robertson
Original assignee: TRANSLODE JOINT Co
Current assignee: TRANSLODE JOINT Co
Priority date: 1936-03-30
Filing date: 1936-03-30
Publication date: 1938-09-20
Anticipated expiration: 1955-09-20

Description

SPt 20, 1938. R. R. ROBERTSON 2,130,859

ROAD ION JOINT Filed March C50, 1936 @055er E Ha/se rsa/V.

Patented Sept. v20, 1.938

UNITED STATES PATENT OFFICE The Translode Joint Company,

Chicago Heights, Ill.,va corporation of Illinois Application March 30, 1936, Serial No. 71,572

11 Claims.

The present invention pertains to concrete construction joints and more particularly to a road expansion joint disposed between adjacent concrete road slabs, with said joint including in combination an assembled core unit comprising superimposed precast mastic ller boards sep' arated by a transversely disposed load transmitting expansion device consisting of pairs of .core plates having portions thereof formed to slidably interiit one another with said core plates being provided with anchoring wings or arms adapted to be embedded in the adjacent concrete road slabs to reinforce the slabs and also serve as a means whereby loads may be transmitted l5 from one -road slab across the expansion joint to the adjacent 'road slab.

It is an object of this invention to provide an improved road expansion'joint mechanism comprising a preformed plastic core which is separated into core sections by one or more sets ofI adjustable or telescoping shield devices providing `pockets for the reception of the core boards and also including anchoring wings or arms alternately arranged to be embedded in the concrete slabs on opposite sides of the joint.

It is also an object of this invention to provide a road expansion joint forming device in the form of a unit adapted to be set up on a road subgrade for the separationof concrete road slabs, saiddevice -consisting of'an assembled preformed mastic core having core plates contacting opposite sides thereof with each of said core plates having an intermediateportion thereof formed to provide double loops projecting in opposite directions from' y the plane of the plate and having one of said with respect to those on the opposite side, saidA core plates having the middle portions thereof formed to provide double looped or S-sections adapted to sndabiy interni with the s or double 50 looped portion of an opposite'core plate to provide a horizontal partition extending transversely through the core.

It is furthermore an object of this invention to provide an expansion'joint in the form of a core 55 board having portions thereof separated by means ofa load transmission expansion device consisting of oppositely positioned core plates having intermediate portions thereof formed .to provide double looped sections which interflt with the duble looped sections of an opposite core plate to provide a quadruple plate partition separating sections of the core boards and adapted with the expansion and contraction of the road slabs with the assistance of anchoring blades or wings, forming part of the core plates and embedded in the concrete in staggered relation on opposite sides of the core board, to serve as reinforcing means for `the sections of the concrete disposed adjacent the sides of the core board.

It is also an object of this invention to provide an expansion joint device for use between the concrete slabs of a road, said device consisting of a compressible core having sections thereof separated by interiitting S-sections forming integral parts of core plates -disposed on opposite sides of Vthe core and having struck therefrom anchoring blades which are embedded in the concrete slabs on opposite sides of the joint.

It is an important object of this invention to provide a road expansion joint mechanism for embeddingbetween concrete road slabs, said mechanism consisting of one or more load transmission units each consisting of core plates having anchoring blades struck therefrom with the anchoring blades of one plate staggered with respect to those of an opposite plate, said core plates furthermore having integral portions thereof formed to provide double looped sections projecting in opposite directions from the plates and positioned to slidably interflt with the double looped portions of an opposite plate to provideA an expansion joint partition inclosing compressible packings and affording a shield across the expansion joint to prevent water or foreign materials from entering the main portion of the joint.

Other and further important objects of this invention will be apparent from the disclosures in the specification and the accompanying drawing.

The invention (in preferred forms) is illustrated in the drawing and hereinafter more fully described.

On the drawing:

Figure 1 is a vertical detailed section taken through an expansion joint embodying the principles of this invention and including core plates having double looped portions which interiit one another to form a partition across the core board for the transmission of loads across the joint from one concrete slab to another-with the assistance of anchoring members struck froml the :core plates.

Figure 2 is a top plan view of the expansion joint load transmission unit with the concrete omitted.

Figure 3 is a vertical detail section of a modied form of load transmitting expansion joint consisting of upper and lower load transmitting shield units engaging opposite sides of the core and projecting therethrough and including staggered anchoring means which are embedded in the concrete on opposite sides of the joint.

As shown on the drawing:

The road expansion joint as illustrated in Figures 1 and 2 is formed by means of the joint forming unit illustrated in Figure 2 before being embedded between concrete road slabs.- The various members comprising the joint forming unit are adapted to be assembledland tied together and then shipped to locations ready to be placed in position upon the road subgrade to permit concrete to be poured on opposite sides of the joint forming unit. The improved joint forming unit illustrated in Figures 1 and 2 comprises a preformed compressible bottom filler board I and an upper illler board 2 constructed of asphalt, sponge rubber, cork or any other suitable compressible material, such for example as the compressible material known to the trade asFlexcel. 'Ihe two ller or core boards I and 2 are disposed one above the other and are separated and held in place by means of a load transmission device or unit comprising a pair of oppositely positioned metal plates 3 having apertures provided therein to register with apertures provided in the core boards I and 2 to permit tie wires 4 to be projected through the plates and the core boards with the ends of the wires twisted upon one another as illustrated in Figures 1 and 2 to hold the core boards and the load transmitting device in assembled relation ready to be shipped to location `ior installation upon a road subgrade between concrete road slabs.

Each of the metal plates' 3 has the middle portion thereof bent over or formed to provide an intermediate S-section in the form of a wide loop 5 and a narrow loop 8 respectively projecting away from opposite sides of the plate 3 with the looped ilanges integrally connected by means of a common plate I formed by the integral connection of one of the side plates of each of the looped flanges. As clearly illustrated in Figure l the narrow looped flange 8 and the common plate 1 forming ya part thereof projects transversely of the core between the upper and lower core boards I and 2 and slidably telescopes or projects into the wide looped iiange 5 of theopposite plate.

The two narrow looped flanges 6 project in op' posite directions through the core andin sliding contact with one another to provide a partition between the lower and upper core boards I and 2 consisting of four thicknesses of the metal plates. The plates 3 together with the interfitting S-'sections thereof provide suitable holding pockets or sockets for the lower margin of the top core board 2 and for the upper margin of the lower core board I. The two wide or larger looped ilanges 5 of the plates 3 provide chambers in the closed ends of said looped anges which are filled with a compressible material 8 such as oakum treated with asphalt or the. like.

Struck from the upper margins of each of the plates 3 are tapered anchoring blades or wings 9 the outer ends of which are wider than the inner ends to serve as wedge or anchoring means when The load transmission device after being assembled as a unit as illustrated in Figure 2 isadapted to be shipped to location to be disposed transversely across the road vsubgrade and extending from the center'strip of the road outwardly to the outer edge thereof. With the expansion joint device mounted in position concrete is deposited on opposite sides of the joint forming mechanism to embed the same and form the concrete road slabs Ill. As clearly illustrated in Figure 1 both the anchoring blades 9 and the large looped flanges 5 of the core plate are embedded in the concrete forming the road slabs I0. The anchoring blades 9 not only serve as a means for anchoring the load transmission device in the adjacently positioned road slabs I to permit loads to be transmitted from one road slab through the core to the opposite road slab, but also serves as reinforcing means for reinforcing the concrete sections adjacent opposite sides of the upper portion of the joint and above the wide looped flanges of the load transmitting unit.

Figure 3 illustrates a modiied form o-f load expansion joint embedded between concrete road slabs II and I2 and consisting of a compressible core comprising a lower filler or core board I3, an intermediateller or core board I4 and an upper filler or core board I5. The three core boards are sepa-rated by lower andupper load transmission devices substantially the same as that illustrated and described in connection with Figures 1 and 2 of the drawing with the exception that the lower portions of the plates 3 have anchoring blades or wings 9 struck therefrom in addition to the'upper anchoring blades struck from the upper margins of the core plates. The

upper and lower anchoring blades on each side of the joint are staggered with respect to one another as are also the blades on opposite sides of the joint. v

When a load is applied to the top of the road slab II the load is transmitted across the expansion joint through the load transmission devices connecting the two road slabs. Under normal conditions when a load is applied to one of the road slabs there is a tendency for the concrete of the opposite road slab to crack along the dotted line I6V and along the dotted line l1 of the lower portion of the road slab I.I. With the present form of load transmission unit forming part of the expansion joint and embedded between the concrete road slabs II and I2 the anchor blades 9 are` so positioned that they strengthen the normally weakened sections of the road slabs by extending through the cracking areas thereby tending to defer the cracking of Iportions of the road slabs when excessive loads are applied to the road. 4

It will of course be understood that various details of construction may be varied through a wide range without departing from the principles of this invention and it is therefore not the -purpose to limit the patent granted hereon otherwise than necessitated by the scope of the appended claims. Y

I claim as my invention:

l. In an expansion joint for embedding between adiacent concrete road slabs, preformed compressible core boards, a load transmission device projecting between the core boards and comprising a pair of plates contacting opposite sides of the core boards, double looped sections integrally formed on said plates and slidably intertting one another to provide a partitionbetween the core boards, a compressible packing between the-double looped sections of said plates, and anchoring blades on said plates projecting outwardly from opposite sides of the joint and embedded in the concrete road slabs.

2. The combination with adjacent concrete road slabs having core members therebetween, of a load transmitting means anchored in the slabs on opposite sides of the core members and projecting therebetween, said load transmitting means comprising a pair of plates each having av pair of looped sections formed therein and projecting from opposite sides of the plate with the looped sections of one plate slidably interfitting the looped sections of the other plate.

3. The combination with adjacent concrete road slabs having core members therebetween,

of a load transmitting means anchored in the slabs on-opposite sides of the core members and projecting therebetween, said load transmitting means comprising a pair of plates each having a pair of looped sections formed therein and projecting from opposite sides of the platev with the looped sections of one plate slidably interfitting the looped sections of the other plate, and staggered anchor blades on said plates embedded in said slabs.

4. The combination with adjacent concrete road slabs having corev members therebetween, of a load transmitting means anchored in the slabs on opposite sides of the core members and projecting therebetween, said load transmitting means comprising a pair of plates each having a pair of looped sections formed therein and projecting from opposite sides of the plate with the looped sections of one plate slidably intertting the looped sections of the other plate, staggered anchor blades struck outwardly from said plates and embedded in said slabs, and a compressible filling disposed between the interiltting looped sections of said plates.

5. The combination with adjacent concrete road slabs having core members therebetween, of a load transmitting means anchored inr the slabs and projecting between the core members,

said load transmitting means comprising a pair of metal plates, means for securing the plates on opposite sides of the core members, anchor blades struck from said plates and embedded in said slabs, said anchor blades of one plate staggered with respect to the anchor blades on the opposite plate, a. large loop and a small loop formed on each of said plates and connected to one another by a common'plate projecting between the core members, said small loop of each plate projecting between the core members into the large loop of the opposite plate.

6. The combination with adjacent concrete road slabs having core members therebetween, of a load-transmitting means anchored in the slabs and projecting between the core members, said load transmitting means comprising a pair of metal plates, means for securing the plates on opposite sides of the core members, anchor blades struck from said plates and embedded in said slabs, said anchor blades of one plate staggered with respect to the anchor blades on the opposite plate, a large loop and a small loop formed on each of said plates and connected to one another by a common plate projecting between the core members, said small loop of each plate projecting between the core members into the large loop of the opposite plate, and a filling in each of Said large loops to serve as a seal between the large loop and the small loop projecting therein.

7. The combination with adjacent concrete road slabs having a multiple sectioned joint core therebetween, of a load transmitting means projecting between the sections and .anchored in said road slabs, said load transmitting means comprising a pair of metal plates each having an intermediate portion thereof formed to provide a wide loop and a narrow loop projecting in opposite directions and connected to one another with the narrow loop projecting between the core sections and into the wide loop of the opposite plate.

8. A road expansion joint disposed between adjacent road slabs and comprising superimposed plastic filler boards, metal plates positioned against opposite sides of said boards, anchor blades struck outwardly from said plates, each of said plates having a portion thereof folded upon itself to form a two loop section with one loop section anchored in one of the road slabs and the other loop section projecting through the joint between the plastic ller boards and into the oth road slab.

9. A road expansion joint comprising superimposed preformed ller boards, metal plates on opposite' sides of said boards and overlapping the space therebetween, said plates folded to form looped portions projecting in opposite directions transversely between the ller boards with a looped portion of one plate overlapping a looped portion of another plate to provide four thicknesses of metal between the ller boards.

10. An expansion joint forming mechanismincluding in combination a load transmitting unit comprising a pair of plates, anchoring blades struck therefrom, each of said plates having portions thereof deected outwardly from opposite sides thereof to form looped anges connected by a common plate section forming part of each of said looped flanges and projecting through the plane of the plate from which it is formed.

11. An expansion joint forming mechanism comprising a plurality of preformed solid plastic core boards, and means connecting the same and comprising a pair of plates having interlltting 8- sections formed therein and projecting transversely between said core boards and beyond both sides thereof.

ROBERT R. ROBERTSON.