PERCH designed a freestanding hoist for renovations to an outpatient cancer facility in Newton, MA. An external steel tower supports the 5-story hoist mast, with a stabilizing tieback to the building roof.

PERCH designed two hoists for access to a 50-story residential tower under construction in Boston. Challenges included foundation design for such a tall hoist, developing a clamping tie to a four-story concrete column that could withstand wind forces on the hoist, and designing a post-construction detail for anchoring to a prestressed concrete floor slab where the general contractor inadvertently omitted two inserts prior to placing the concrete. PERCH drafted plans for hoist construction, conducted site visits, and corresponded with hoist subcontractor Julian Crane as well as the general contractor.

PERCH designed the foundation and support structure for a 90 foot tall tower crane used to build a new residential tower in East Boston. The crane was located on a floor slab above an open basement, requiring PERI shoring posts and a steel bridge beam assembly to transfer loads from the crane outrigger cones to four existing pile caps. PERCH also developed a construction sequence to pre-load the shoring posts and minimize deflection of the slab.