Structures for use in erecting multistory buildings and methods for making such structures

An elevator shaft for use in constructing a multi-story building, the elevator shaft being formed from a series of elevator shaft segments, the elevator shaft comprising:

• a lower shaft component including walls, an upper edge, a lower edge, and a series of pockets formed along each of the walls, each pocket including a recessed surface and adjacent exposed surfaces;
• an upper shaft component including walls, an upper edge, and a lower edge, the lower edge of the upper shaft component being joined to the upper edge of the lower shaft component to form one of the series of elevator shaft segments;
• a slab floor formed about the elevator shaft segment with the slab floor extending into the pockets of the lower shaft component;
• a series of hooked rebar segments, each hooked rebar segment including first and second ends, with the first end formed within the lower shaft component and the second end extending from one of the series of pockets and into the slab floor.

A method of constructing a multi-story building about an elevator shaft at a jobsite, the elevator shaft being formed from a series of shaft segments, with each shaft segment being formed at an offsite facility, the method comprising the following steps:

• forming a lower shaft component at the offsite facility from reinforced concrete, the lower shaft component including walls, an upper edge, a lower edge, and a series of pockets, with each pocket including recessed and exposed surfaces;
• forming an upper shaft component at the offsite facility from reinforced concrete, the upper shaft component including walls, an upper edge and a lower edge;
• joining the lower edge of the upper shaft component to the upper edge of the lower shat component, the joined shaft components constituting a shaft segment;
• securing the shaft segment with a series of stitch plates, with each stitch plate secured between a wall of the upper shaft component and one of the exposed surfaces of the lower shaft component;
• transporting the shaft segment to the jobsite and installing it as one of the series of segments forming the elevator shaft;
• pouring a concrete floor slab about the shaft segment, with the poured concrete extending into and bonding with the series of pockets within the lower shaft component.