HDD Challenge: Pipeline River and Levee Crossing Combines Trenchless and Over-the-Top Construction Methods

摘要

Considering trenchless design engineering alternatives early during project routing can offer considerable savings of time and money for pipeline owners.The combination of over-the-top levee crossings with an HDD installation from bat-ture to batture under the river allows for a shorter HDD length, the ability to use smaller equipment in construction, and less permitting and review due to the lesser risk to levee foundation soils. Pipeline owners should consider the shortest or most direct route might not always be the easiest way to cross an obstacle. Looking upstream and downstream for ample space between the river and levee for HDD entry and exit points, and routes could be adapted to accommodate these types of crossings where appropriate.