HELICAL PILES NOTES.docx
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- FA813727R0002
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This document is a technical specification for helical pile design and installation requirements. Helical piles must be designed and manufactured in accordance with the current International Building Code (IBC) adopted by the local jurisdiction, with the manufacturer holding a current ICC-ES ESR report demonstrating compliance with AC358. The supplier is responsible for designing central shaft dimensions and helical bearing plates (number, size, spacing, and thickness) to support specified design loads. Installation torque requirements must be established by the manufacturer, with minimum torque sufficient to achieve required bearing capacity including a safety factor of 2, and maximum torque not exceeding the allowable torsional capacity of the pile shafts. Helical piles must be designed to resist all stresses induced by installation.
The specification requires confirmation of existing conditions and underground obstructions prior to installation, with probing or scanning necessary to locate obstacles and reporting of unforeseen obstructions to the structural engineer. Pile locations cannot be changed without written structural engineer approval. Special inspection must be performed per Section 1705.9 of the 2024 IBC, with the inspector documenting equipment used, pile dimensions, tip elevations, final depth, final installation torque, installation date, pile and installation contractor information, allowable torque values, helix plate configuration, and both ultimate and allowable capacity for each pile as specified by the manufacturer.
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Text version
HELICAL PILES
HELICAL PILES SHALL BE DESIGNED AND MANUFACTURED IN ACCORDANCE WITH THE CURRENT INTERNATIONAL BUILDING CODE (IBC) ADOPTED BY THE LOCAL JURISDICTION.
HELICAL PILES SHALL BE DESIGNED AND MANUFACTURED BY SUPPLIER.
HELICAL PILE SHALL BE RECONGNIZED BY ICC AND THE MANUFACTURER SHALL HOLD A CURRENT ICC-ES ESR REPORT SHOWING COMPLIANCE WITH AC358 AND CURRENT INTERNATIONAL BUILDING CODE (IBC) ADOPTED BY THE LOCAL JURISDICTION.
DIMENSIONS OF THE CENTRAL SHAFT AND THE NUMBER, SIZE, SPACING AND THICKNESS OF THE HELICAL BEARING PLATES SHALL BE DESIGNED AND FABRICATED TO SUPPORT THE SPECIFIED DESIGN LOADS.
MINIMUM AND MAXIMUM INSTALLATION TORQUES SHALL BE SPECIFIED BY THE HELICAL PILE MANUFACTURER. THE MINIMUM INSTALLATION TORQUE SHALL BE HIGH ENOUGH TO ACHIEVE THE REQUIRED BEARING CAPACITY, INCLUDING A SAFETY FACTOR OF 2. THE MAXIMUM INSTALLATION TORQUE SHALL NOT EXCEED THE ALLOWABLE TORSIONAL CAPACITY OF THE PILE SHAFTS.
HELICAL PILES SHALL BE DESIGNED AND MANUFACTURED TO RESIST ALL STRESSES INDUCED BY INSTALLATION.
EXISTING CONDITIONS AND UNDERGROUND OBSTRUCTIONS SHALL BE CONFIRMED BY THE PILE INSTALLER. PROBING OR SCANNING MAY BE NECESSARY TO LOCATE UNDERGROUND OBSTRUCTIONS. REPORT ANY UNFORSEEN OBSTRUCTIONS TO THE STRUCTURAL ENGINEER.
LOCATIONS OF PILES SHALL NOT BE CHANGED WITHOUT WRITTEN APPROVAL FROM THE STRUCTURAL ENGINEER.
SPECIAL INSPECTION OF THE HELICAL PILE INSTALLATION SHALL BE PERFORMED IN ACCORDANCE WITH SECTION 1705.9 OF THE 2024 IBC. THE INSPECTOR SHALL RECORD THE FOLLOWING:
A. EQUIPMENT USED.
B. PILE DIMENSIONS.
C. TIP ELEVATIONS.
D. FINAL DEPTH.
E. FINAL INSTALLATION TORQUE.
F. INSTALLATION DATE.
G. PILE MANUFACTURER.
H. INSTALLATION CONTRACTOR.
I. MINIMUM ALLOWABLE INSTALLATION TORQUE.
J. MAXIMUM ALLOWABLE INSTALLATION TORQUE.
K. HELIX PLATE CONFIGURATION OF EACH PILE.
L. ULTIMATE CAPACITY OF EACH PILE AS SPECIFED BY MANUFACTURER.
M. ALLOWABLE CAPACITY OF EACH PILE AS SPECIFIED BY MANUFACTURER
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