Connection system for concrete and steel structures

Claim 2

A connection system for concrete and steel structures comprising a. a pair of frame plates which face each other when each plate is fastened to one of the structures to be connected, b. thickened marginal portions on the frame plates abutting each other, each marginal portion being provided with an outwardly opening peripheral longitudinally extending cavity and a longitudinal groove communicating with the cavity, and spaced apart notches on the face abutting the other frame plate, c. peripheral tongue strips which fit in the cavity of the abutting marginal portions of the frame plates and have tongues which enter the grooves in the said portions, and holes in the tongue strips registering with the notches of the frame plates when in abutting positions, and d. a fastener extending through the registering notches in a pair of frame plates and a hole in the tongue strip to connect the pair of frame plates together and thereby connect the structural members to which the frame plates are fastened.

Claim 3

The connecting system defined by claim 1, in which the outer face of each tongue strip is parallel and approximately flush with the peripheral surface of the thickened portions of the frame plates.

Claim 4

The connection system defined by claim 1, in which the fastener is a headed bolt having its head bearing on the inner face of the thickened portion of the frame plates, and its shank protruding beyond the peripheral surface of the frame plates for reception of a washer and nut for holding the frame plates of a pair together.

Claim 5

The connection system defined by claim 1, in which the fastener is a threaded member welded to one of the frame plates of the pair.

Claim 6

The connection system defined by claim 1, in which the notches in the abutting faces of the frame plates are semicircular and the holes in the tongue strips are circular and the same diameter as the openings formed by registering notches in the abutting faces of the frame plates.

Claim 7

The connection system defined by claim 1, in which the frame plates are rectangular in shape, the thickened marginal portions extend around the four edges of each frame plate, and each of the tongue strips is equal in length to an edge of the frame plates.

Claim 8

The connection system defined by claim 1, in which the inner surfaces of the thickened portions of the frame plates are recessed, and the fasteners are headed bolts, the heads of the bolts being located in the recesses on the inner surfaces of the thickened portions and the shanks of the bolts protrude outwardly through the thickened portions and the tongue strips.

Claim 9

A connection system for connecting a reinforced concrete structure and a steel structure, comprising a. a reinforced concrete structure which has threaded members protruding therefrom, b. a steel structure to be connected to the concrete structure, c. a pair of frame plates which face each other when each plate is fastened to one of the structures to be connected, d. means connecting one of the plates to the members of the concrete structure, e. means connecting the other of the plates to the steel structure, f. thickened marginal portions on the frame plates abutting each other, each marginal portion being provided with an outwardly opening peripheral longitudinally extending cavity and a longitudinal groove communicating with the cavity, and spaced apart notches on the face abutting the other frame plate, g. tongue strips which fit in the cavity of the abutting marginal portions of the frame plates and have tongues which enter the grooves in said portions, and holes in the tongue strips registering with the notches of the frame plates when in abutting positions, and h. a fastener extending through the registering notches in a pair of frame plates and a hole in the tongue strip to connect a pair of frame plates together and thereby connect the structural members to which the frame plates are fastened.

Claim 10

A connection system for connecting a reinforced concrete structure and a steel structure, comprising a. a reinforced concrete structure which has threaded members protruding therefrom, b. a steel structure to be connected to the concrete structure, c. a pair of frame plates which face each other when each plate is fastened to one of the structures to be connected, d. means connecting one of the plates to the members of the concrete structure, e. means connecting the other of the plates to the steel structure, f. thickened marginal portions on the frame plates abutting each other, each marginal portion being provided with an outwardly opening peripheral longitudinally extending cavity and a longitudinal groove communicating with the cavity, and spaced apart notches on the face abutting the other frame plate, g. tongue strips which fit in the cavity of the abutting marginal portions of the frame plates and have tongues which enter the grooves in said portions, and holes in the tongue strips registering with the notches of the frame plates when in abutting positions, and h. a fastener extending through the registering notches in a pair of frame plates and a hole in the tongue strip to connect a pair of frame plates together and thereby connect the structural members to which the frame plates are fastened.

Claim 11

The connection system defined by claim 8, in which one of the frame plates is welded to the steel structure.