2DM Associates designed a support beam system that was tied into the building structure to carry a 100-tonne air hoist used for the lift and change-out of a series of digester vessels at a Louisiana paper mill. A structural analysis of the building revealed that only minor modifications were required to safely carry the loads for this lift. Specifically, the floor that carries the support beams and the floor below were braced together to form an 11-foot deep truss. One of the diagonal truss members is visible at the right side of the photo.
This integrated design eliminated the need to install shoring in the plant from grade up to the level of the air hoist support, a height of 180 feet, thus saving the contractor significant time and money and greatly reducing the impact of this work on other contractors working in the mill.
The design of the digester vessel lifting cover was also performed by 2DM Associates.