HDD under Pearl Harbor Provides Joint Base Pearl Harbor-Hickam with New Water Supply Line

摘要

Joint Base Pearl Harbor-Hickam (JBPHH), a combination of the Pearl Harbor Naval Station and Hickam Air Force Base on Oahu, required installation of a new water supply line across Pearl Harbor as part of its mission to provide a safe and sufficient supply of water to meet potable water and life safety requirements on the base.This recently completed project replaced approximately 3,500 feet of existing, deteriorated 24-inch cast iron water line with a new 24-inch fusible polyvinylchloride (FPVCP) water line in an HDD-installed 30-inch steel casing from Ford Island to Landing C on the JBPHH. Soft soil conditions with unstable sediments and existing historical features were the main design considerations. This paper will focus on the design and construction of this primary replacement potable water artery, including unexploded ordnance avoidance, historical features on Ford Island, annular space treatment concepts between the steel casing and FPVCP water line, and expansion coupling vaults on each end of the HDD-installed water line.