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Precast concrete slab connector

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Precast concrete slab connector


A precast concrete slab connector for connecting two adjacent slabs in edge-by-edge juxtaposition, each with a recess in registry with a recess in and an adjacent slab. A pair of anchor plates are positioned the slab recesses and a shear plate spans the slabs recesses and overlies the anchor plates. The shear plate has openings that are in registry with one of an anchor plate opening. Multiple fasteners are extend through the openings in the anchor plates and the shear plates and include removable retainers that clamp the shear plates and the anchor plates together. The fasteners can be cast in part into each adjacent slab. Serration can be provided with facing surfaces of the anchor plates and the shear plate or on facing surfaces of the shear plate and washers that are mounted on the fastener.
Related Terms: Juxtaposition Registry Serration Washer Anchor

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USPTO Applicaton #: #20140020321 - Class: 525821 (USPTO) -


Inventors: Wesley K. Eklund, Gary Roberts, Tom Gerst, Sidney E. Francies

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The Patent Description & Claims data below is from USPTO Patent Application 20140020321, Precast concrete slab connector.

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CROSS-REFERENCE TO RELATED APPLICATION

This application claims the benefit of U.S. Provisional Patent Application No. 61/433,751, filed Jan. 18, 2011, and U.S. Provisional Patent Application No. 61/537,211, filed Sep. 21, 2011, both of which are incorporated herein by reference in their entirety.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The invention relates to a connector for adjoining adjacent precast concrete slabs or wall panels together or to a structural member of a building. Portions of the connector are embedded in the concrete wall at the time the slab is cast.

2. Description of the Related Art

Precast concrete wall panels, sometimes referred to as concrete slabs, are widely used in the building construction industry. Generally, the wall panels are manufactured at a remote facility and then shipped to the job site and erected. Once erected, connectors are used to mount the wall panels to the structural framework of the building or to attach one wall panel to another. There are many designs and materials used for these connectors, and the connectors can be pre- or post-installed. A connector may be attached to a concrete wall panel, usually by bolting it to the concrete. However, often the connectors are embedded in the concrete panels during the casting process. The exposed edges of the opposing components of the connector are then welded together to connect the erected wall panels. The metal components are commonly called weldments, weld plates, or flange connectors.

Opposing connectors often do not align perfectly with one another, so a lug or rod is welded between the connectors, instead of directly welding the connectors together. The lug or rod is welded to each connector, thereby taking up any misalignment. Using this method, at least two welds must be made at each of the multiple connections between the wall panels.

SUMMARY

OF THE INVENTION

According to the invention, precast concrete slab connector for connecting two adjacent slabs in edge-by-edge juxtaposition and each of the slabs has a recess formed adjacent a recess adjacent a corresponding recess in the adjacent slab to form a recess that spans both adjacent slabs. The connector comprises a pair of anchor plates that each have at least one opening and that each is configured to be positioned within one of the slab recesses; a shear plate that has at least two openings and that is configured to span the slabs recesses and overlie the anchor plates; wherein the shear plate at least two openings are configured so that one of the at least two openings can be in registry with one of the anchor plate openings when the anchor plates are positioned within the slab recess, and multiple fasteners configured to project through the openings in anchor plates and the shear plates. The fasteners include removable retainers that are configured to clamp the shear plates and the anchor plates together and thereby bind the slabs together.

In one embodiment, the fasteners are configured to be cast in part into the slab recess.

In one embodiment, the fasteners comprise bolts and nuts and the retainers comprise the nuts that are threadable onto the bolts. Other fasteners such as shafts and threadless retainers can also be used.

In a preferred embodiment, the anchor plates can be identical.

The shear plate openings can be formed by at least one set of slots that are perpendicular to each other. Preferably the shear plate openings are formed by two sets of slots that are perpendicular to each other.

In one embodiment, the shear plate and the anchor plates have facing serrations that interlock with each other. The serrations may take the form of pyramids or may take the form of ridges and valleys.

In another embodiment, the shear plate can have serrations on a surface thereof and washers with interlocking serrations can be configured to be positioned on the surface of the shear plate in registry with the shear plate serrations. The serrations on the washers are on a surface that faces serrations on the surface of the shear plate. The washers can be mounted on the fasteners and the fasteners can clamp the washers to the shear plate. Further, the serrations on the shear plate can be positioned adjacent the slots for interfacing with the serrations on the washers. In addition, the serrations can be formed by parallel rows of ridges and valleys.

Further according to the invention, a connecting joint is formed between two concrete slabs having a recess spanning the two slabs, the connecting joint comprising a connector according any of the foregoing embodiments.

Still further according to the invention, a connecting joint is formed between two concrete slabs having a recess spanning the two slabs, the recess having a portion of the recess in each of the two concrete slabs. The connecting joint comprises an anchor plate mounted in each of portions of the recess with bolts have shafts that extend through openings in the anchor plate; a shear plate spans both portions of the recess and is mounted to each of the anchor plates though the bolts and with nuts fastened onto the bolts.

In one embodiment, the bolts are cast in part into the respective slab.

In one embodiment, the shear plate has at least one set of slots that are perpendicular to each other. Preferably, shear plate has two sets of slots that are perpendicular to each other.

In addition, the shear plate and the anchor plates can have facing serrations that interlock with each other. Alternately, the shear plate have serrations on an upper surface thereof and washers can be mounted on the bolts between the fasteners and the shear plate, wherein the washers can have on the undersurface thereof serrations which mate with the serrations on the upper surface of the shear plate. The serrations may take the form of pyramids or may take the form of ridges and valleys. In addition, the serrations on the shear plate can be positioned adjacent the slots for interfacing with the serrations on the washers.

In a preferred embodiment, there are multiple bolts connecting each anchor plate and the shear plate.

According to the invention, the joints are free from welds between the anchor plates and the shear plate.



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Previous Patent Application:
Leave-in-place concrete formwork combining plate dowels, divider plates, and/or finishing, armoring and/or sealing molding
Next Patent Application:
Floor covering and locking systems
Industry Class:
Synthetic resins or natural rubbers -- part of the class 520 series
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stats Patent Info
Application #
US 20140020321 A1
Publish Date
01/23/2014
Document #
13979883
File Date
01/17/2012
USPTO Class
525821
Other USPTO Classes
International Class
04B1/61
Drawings
7


Juxtaposition
Registry
Serration
Washer
Anchor


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