2 in. Pier Sled
3 in. for uncased piers
4 in. when casing is used
6 in. Pier Sled
Centraligner® pier sleds and Hijacker™ pier bolsters
The sole purpose of our products is to keep a reinforcing steel cage centered and off of the floor of a drilled shaft to insure proper alignment and concrete cover in accordance with ACI specifications.
The products are made from 8,500 psi high strength grout. The sled is patented and the bolster is patent pending. The sled is curved in such a way as to allow the cage to be placed in the shaft without gouging the side of the shaft. And, if an inspector or someone else, wants to reinspect the cage and/or shaft, the cage can be withdrawn without gouging the sides.
The sled has four sets of #16 gauge integrated tie wires for ease of installation. This is the same gauge tie wires which the laborers are using to tie the other reinforcing steel on the job. The bolsters have #9 gauge wire embedded for ease of installation. (Epoxy coated or stainless steel tie wires are available.)
Generally, it takes an unskilled laborer 40 seconds to "tie on" a sled and a minute-10 seconds to "tie on" bolster.
The sleds are made in sizes of 2", 3", 4" and 6". The bolsters are made in 3" and 6" inch sizes. The 6" bolster is actually 8" tall with a 2" shaft cast in the top portion to enable a portion of the vertical rebar to fit therein. Otherwise, the bolster cannot be sufficiently secured to the cage because of its length.
The 3" sled and the 3" bolster are the products most commonly used. (The 4" sled is used when a shaft is cased and the casing is to be removed. The 6" sleds and bolsters are used in Alabama, North and South Carolina and Florida as a respective state DOTs require 6" of cover. The 6" sled has #9 gauge tie wire at each end because of its weight.)
Our competition is generally a rock, brick, 2 X 4, or nothing. NOTHING is our biggest competitor!
Our products are quality assurance products; thus, they are contingent liability reducers.
Regarding specifying our products on publicly funded jobs:
A patented product can in fact be specified when an "or equal" does not exist, as the specifier is either a registered engineer or architect. This registration gives them the legal authority to specify a product they deem appropriate. The court case of Whitten vs. Paddock verified this fact. My research reveals that there is not a Federal regulation of any kind which prohibits specifying a patented product. To prohibit such a specification would in fact be discrimination against a patented item(s). If an individual states that he/she is prohibited by law from specifying a proprietary product then ask them for a copy of the regulation! I have yet to have anyone present me with a copy or quote chapter and verse of any such regulation.
Centraligner® pier sleds
U.S. Patent No. 4,741,143
Centraligner® Pier Sleds are designed to easily and effectively center reinforcing steel cages in a drilled pier hole. The Centraligner® is available in four sizes, i.e.. 2", 3", 4" and 6" and is fabricated from high strength, 8,500 psi grout.
To Order:
Give quantity, size and name.
Stainless steel or epoxy coated tie wires are available on special order.
Specification:
Suggested specification for obtaining the benefits of the Centraligner® Pier Sled.
"Pier reinforcing steel shall be properly positioned within the drilled shaft by a positive recognized means, equal to Centraligner® Pier Sleds manufactured by PIERESEARCH, Arlington, Texas."
2 in. Pier Sled
3 in. for uncased piers
4 in. when casing is used
6 in. Pier Sled
Hijacker™ pier bolsters
Hijacker™ Pier Bolsters are designed to properly space a reinforcing steel cage off the bottom of a drilled pier hole. The Hijacker™ is fabricated from high strength, 8,500 psi grout. They easily attach to the bottom of the cage and provide specified concrete cover. The Hijacker™ Pier Bolster is available in 3" and 6" sizes.
To Order:
Give quantity, size and name.
Stainless steel or epoxy coated tie wires are available on special order.
Specification:
Suggested specification for obtaining the benefits of the Hijacker Pier Bolster.
"Pier reinforcing steel shall be properly supported at the bottom of the drilled shaft by a positive recognized means, equal to Hijacker™ Pier Bolster manufactured by PIERESEARCH, Arlington, Texas."
3 in. Bolster
6 in. Bolster
Installation Instructions
The Centraligner® pier sled must be attached with the two end pairs of the wires tied securely to the vertical bar and the two middle wires tied securely to the spiral. Failure to follow these instructions may cause bodily injury and/or affect the sled's performance.
The Hijacker™ pier bolster must be securely attached to the end of the vertical bar with the bolsters looped ends tied over the bottom spiral. Failure to follow these instructions may cause bodily injury and/or affect the bolster's intended purpose.
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