2.7.1
Welded Frames
Continuously weld frame faces at corner joints. Mechanically interlock or
continuously weld stops and rabbets. Grind welds smooth.
2.7.2
Knock-Down Frames
Design corners for simple field assembly by concealed tenons, splice
plates, or interlocking joints that produce square, rigid corners and a
tight fit and maintain the alignment of adjoining members. Provide
locknuts for bolted connections.
2.7.3
Mullions and Transom Bars
Mullions and transom bars shall be closed or tubular construction and shall
member with heads and jambs butt-welded thereto [or knock-down for field
assembly]. Bottom of door mullions shall have adjustable floor anchors and
spreader connections.
2.7.4
Stops and Beads
Form stops and beads from 0.9 mm thick 20 gage steel. Provide for glazed
and other openings in standard steel frames. Secure beads to frames with
oval-head, countersunk Phillips self-tapping sheet metal screws or
concealed clips and fasteners. Space fasteners approximately 300 to 400 mm
12 to 16 inches on centers. Miter molded shapes at corners. Butt or miter
square or rectangular beads at corners.
2.7.5
Terminated Stops
**************************************************************************
NOTE: When stops (rabbet strips) are required to be
terminated above the floor, they shall be indicated
or specified; generally, terminated stops are used
in hospitals and similar buildings to eliminate
projections on which wheels of beds and carts are
caught and to eliminate small, dirt-catching corners.
**************************************************************************
Where indicated, terminate interior door frame stops 150 mm 6 inches above
floor. [Do not terminate stops of frames for [lightproof,] [soundproof,]
[or lead-lined] doors.]
2.7.6
Cased Openings
Fabricate frames for cased openings of same material, gage, and assembly as
specified for metal door frames, except omit door stops and preparation for
hardware.
2.7.7
Anchors
Provide anchors to secure the frame to adjoining construction. Provide
steel anchors, zinc-coated or painted with rust-inhibitive paint, not
lighter than 1.2 mm thick 18 gage.
2.7.7.1
Wall Anchors
Provide at least three anchors for each jamb. For frames which are more
than 2285 mm 7.5 feet in height, provide one additional anchor for each
SECTION 08110
Page 12
Previous Page
