Brierley subject matter experts will be presenting at the Microtunneling Short Course, April 27-29, 2022 at The Scottsdale Stadium:
Curved Subaqueous Microtunnel Installation in Coastal El Salvador
Presented by Dave Sackett and Nick Strater, Friday, April 29, 2:15-3:00 PM
In Acajutla, El Salvador, a pressurized 24-in natural gas pipeline was pulled through steel casing pipe beneath a protected nearshore environment and high erosional cliffs. The trenchless route passed through a complex sequence of geologically recent debris avalanche deposits comprised of a mixture of hard gravel to boulder-sized basalt and andesite clasts randomly distributed within a much weaker soil-like volcanic ash matrix. Due to the presence of large quantities of cobbles and boulders, a face-accessible 84-in diameter slurry microtunneling machine was used by a microtunneling contractor to complete installation of approximately 1800-ft of Reinforced Concrete casing pipe along a vertically and horizontally curved alignment. The launching shaft was located onshore, and the MTBM was retrieved from a marine trench “in the wet” by divers and offshore barge. Careful planning and detailed site characterization in advance led to a successful installation of the microtunnel in early 2021.
Microtunnel Shaft Construction
Presented by Charles Luxford, Thursday, April 28, 3:30 to 4:15
This course is an introduction to the various means and methods used to construct shafts for microtunneling. It will also cover the various types of excavation support used.
Find out more at the conference website: 2022 Microtunneling Short Course