Hoists and Cranes

PERCH offers structural services for the installation of high-rise construction equipment.

Residences at Bulfinch Crossing, Boston, MA

PERCH designed two hoists for access to a 50-story residential tower under construction in Boston, MA. 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.

Clippership Wharf, East Boston, MA

PERCH designed the foundation and support structure for a 90 foot tall tower crane used to build a new residential tower in East Boston, MA. 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.

Seaport Parcel M1/M2, Boston, MA

PERCH designed three twin-cab hoists for construction of a 26-story mixed-use building in the Seaport neighborhood of Boston, MA. A shoring system supports two of the hoists from below through two levels of garage under the ground floor; a bridge beam assembly transfers the weight of the third hoist to the structure.