The Concept

Traditional Anchor Bolts

  • Anchor bolts are set into concrete for the attachment of wall sill plates, to resist shear forces in the plates.

 

  • Anchor bolts usually stand up about 6" from the surface of the concrete in order to pass through the sill plate and allow a nut & washer connection.

 

  • Since anchor bolts are used in the sill plates of both exterior and interior walls, this protruded anchor interferes with the concrete finishing tools used to screed the deck, which, especially with large decks, can slow production, limit the use of power screed tools and potentially damage both the finishing tools and anchors themselves.

 

  • Alternative methods such as drilling the cured concrete deck and using wedge anchors is both labor intensive and inadvisable or prohibited with post-tension concrete decks.

The P.T. Anchor

The P.T. Anchor is designed to attach to the concrete form and not protrude above the top of the concrete, leaving the concrete surface clear from obstruction.

 

It is made in 2 parts, the base which can be nailed to the form prior to any rebar or P.T. tendon installation & the threaded rod which can be attached after the rebar and tendon installation. This way the anchor is not bent, broken or moved when the rebar is being installed, and the anchor can be connected just prior to the concrete pour.

 

The anchor is topped with a rod coupler which sits just below the top of concrete deck, with a plastic removable cap to prevent concrete from getting into the coupler, and a flexible whisker which will show the anchor locations after the concrete has cured.

 

The Components

Available Rod Diameters

5/8"

3/4"

Any Height

Locator Cap

Rod Coupler

Threaded Rod

Base Plate

The locator cap is used to plug the coupler, preventing concrete fouling the threads. It has flexible integrated whiskers which do not interfere with concrete finishing equipment, but will stand up to help easily locate the anchors after the concrete has cured.

The rod coupler is the final connection point for the sill plate anchor bolt. It is supported by the threaded rod flush with the surface of the finished concrete. Final connection is made using a short piece of threaded rod, a hex nut and a plate washer.

The base plate is made by encasing a standard coarse thread flange nut in high impact polypropylene. The casing is nailed to the wooden forms and holds the nut and anchor in place while the concrete is poured and cured. The surface of the nut is exposed above the plastic, and it is this that bears on the concrete.

The threaded rod connects the base plate to the coupler above. It is also the main shear resisting element of the anchor. The anchors are currently available in 5/8" and 3/4" diameters to match common shear bolt specifications. The rod is provided cut to length to ensure the rod is half way into the coupler which sits flush with the top of the concrete.

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