Hairpin Product Sheet

WHY USE IT?

In order to meet a designed clearance requirement that is unusual and cannot be provided with a ShaftSpacer wheel alone.

Hairpins are also used when the close spacing of the horizontal or spiral steel reinforcement prevents the ShaftSpacer wheel from being used as a standalone application. 

HAIRPIN

Extension device used in tandem with the ShaftSpacer wheel in order to achieve eccentric spacing requirements and/or meet seismic design considerations.

APPLICATIONS

• Bridge Foundations
• Building Foundations
• Retaining Wall Foundations
• Street Light Foundations
• High Mast Foundations
• Transmission Line Foundations
• Sub-station Foundations
• Tower Foundations
• Slurry Walls

ADVANTAGES

• Saves time & money onsite
• Easy to install
• Lightweight, yet strong, durable
• Engineered with the contractor in mind
• Excellent guide system for placement of fabricated rebar cages into drilled or excavated shafts
• Economical with minimal installation costs

CONSTRUCTION BENEFITS

• Customizable to suit any project challenge.
• Insures the bar reinforcement is properly spaced and aligned within the confines of the drilled shaft or excavation.
• Provides quality assurance for the contractor and owner of the sub-contractor’s performance.
• Provides quality assurance for the engineer and owner of the contractor’s performance.
• Installs quickly and easily requiring only unskilled labor.
• Increases job profitability because skilled labor is released for more demanding tasks.
• Has low labor requirements resulting in project cost savings.

UNUSUAL DESIGN CLEARANCE

Example: the project specification and detail states 9 inch clearance. To achieve this clearance with a wheel alone, the wheel would need to have a diameter of approximately 18 inches. By using a Hairpin bar in conjunction with one of our standard model ShaftSpacer wheels, the 9 inch clearance can be achieved.

CLOSE SPACING OF HORIZONTAL STEEL

Example: the project specification and detail states 6 inch clearance, but the pitch of the spiral is 4 or 5 inches. Therefore, the ShaftSpacer wheel that is normally used for 6 inch clearance is too large and will not attach without interfering with the adjacent spiral bars. A Hairpin is then used to resolve the problem.

Guiding rebar cage into drilled shaft with Hairpin and ShaftSpacer system attached

*When combined with a ShaftSpacer wheel, cover will be increased by this amount. All models are powder coated.

Hairpin attached to rebar cage

Cagecaster tied to horizontal reinforcement hoops