Reidbar Vertical Reinforcing Tensioning for Cantilever Wall Design

This article provides information on the tension requirements for vertical reinforced Interbloc structures.

Introduction

Reidbar vertical reinforcing is a critical component in cantilever wall designs, connecting Interbloc walls to concrete foundations. Proper tension of the Reidbar post-installation is essential to minimize the risk of block dislodgment and ensure structural safety. This article provides guidance on the tensioning process, factors affecting tension requirements, and calculation methods.

Tensioning Principles

Tensioning the reidbar mitigates the inherent stretch risk of the reinforcing bar, creating a safer structure. The amount of tension (torque) required depends on several factors:

• Reidbar Size: Larger reidbars may require higher tension.
• Concrete Pad Connection: The quality and design of the connection influence tension needs.
• Epoxy Type: The epoxy used to cement the starter bar is a limiting factor.

Tension/Torque Calculation

The manufacturer, Reid Construction Systems, provides tension/torque guidance. As Envirocon installations use a hydrapak system (measured in PSi), conversion from Nm (Newton meters) is necessary:

1. Convert N to MPa: Divide N by the cross-sectional area of the reinforcing bar.
2. Convert MPa to Psi: Use the appropriate conversion factor (1 MPa ≈ 145.038 Psi).

Envirocon Installation Procedure

Envirocon utilizes a specifically designed reinforcing bar tensioner powered by a hydrapak. The hydrapak force, measured in PSi, aligns with the converted tension requirements for the reidbar.

Rule of Thumb

In many cases, the limiting factor for tension is the chemset epoxy used to secure the starter bar. Adhering to the manufacturer's epoxy specifications is crucial.

Reid Construction Systems Tension Table