Innovative Micropile Construction with DTH System

Micropile project in Northern Baltimore County

Micropile project in Northern Baltimore County

Our friends at Deep Excavation posted about an interesting micropile case study in Northern Baltimore County for a bridge replacement project. The project consisted of 38 Micro Piles; 7” OD X 38 ft. deep including a 7 ft. rock socket, installed on a 3/1 batter, load tested to 272,000 lbs. What caught my attention is the down the hole hammer system used for installing the micropiles. The system uses a ring bit to install the casing and allow the drill string to continue beneath the bedrock elevation to construct the rock sockets. [Source: Read more about this micropile project and see additional photos at Deep Excavation. Image: Deep Excavation]