29 CFR § 1926.757 - Open web steel joists.
(1) Except as provided in paragraph (a)(2) of this section, where steel joists are used and columns are not framed in at least two directions with solid web structural steel members, a steel joist shall be field-bolted at the column to provide lateral stability to the column during erection. For the installation of this joist:
(i) A vertical stabilizer plate shall be provided on each column for steel joists. The plate shall be a minimum of 6 inch by 6 inch (152 mm by 152 mm) and shall extend at least 3 inches (76 mm) below the bottom chord of the joist with a 13/16 inch (21 mm) hole to provide an attachment point for guying or plumbing cables.
(B) be designed by a qualified person;
(C) be shop installed; and
(D) be included in the erection drawings.
(3) Where steel joists at or near columns span 60 feet (18.3 m) or less, the joist shall be designed with sufficient strength to allow one employee to release the hoisting cable without the need for erection bridging.
(4) Where steel joists at or near columns span more than 60 feet (18.3 m), the joists shall be set in tandem with all bridging installed unless an alternative method of erection, which provides equivalent stability to the steel joist, is designed by a qualified person and is included in the site-specific erection plan.
(6) When steel joist(s) are landed on a structure, they shall be secured to prevent unintentional displacement prior to installation.
(8) Field-bolted joists.
(i) Except for steel joists that have been pre-assembled into panels, connections of individual steel joists to steel structures in bays of 40 feet (12.2 m) or more shall be fabricated to allow for field bolting during erection.
(b) Attachment of steel joists and steel joist girders.
(1) Each end of “K” series steel joists shall be attached to the support structure with a minimum of two 1/8-inch (3 mm) fillet welds 1 inch (25 mm) long or with two 1/2-inch (13 mm) bolts, or the equivalent.
(2) Each end of “LH” and “DLH” series steel joists and steel joist girders shall be attached to the support structure with a minimum of two 1/4-inch (6 mm) fillet welds 2 inches (51 mm) long, or with two 3/4-inch (19 mm) bolts, or the equivalent.
(3) Except as provided in paragraph (b)(4) of this section, each steel joist shall be attached to the support structure, at least at one end on both sides of the seat, immediately upon placement in the final erection position and before additional joists are placed.
(c) Erection of steel joists.
(2) For joists over 60 feet, both ends of the joist shall be attached as specified in paragraph (b) of this section and the provisions of paragraph (d) of this section met before the hoisting cables are released.
Table A - Erection Bridging for Short Span Joists
NM = diagonal bolted bridging not mandatory.
Table B - Erection Bridging for Long Span Joists
|32LH06||47-0 through 60-0.|
|32LH07||47-0 through 60-0.|
|32LH08||55-0 through 60-0.|
|32LH09||NM through 60-0.|
|32LH10||NM through 60-0.|
|32LH11||NM through 60-0.|
|32LH12||NM through 60-0.|
|32LH13||NM through 60-0.|
|32LH14||NM through 60-0.|
|32LH15||NM through 60-0.|
|36LH07||47-0 through 60-0.|
|36LH08||47-0 through 60-0.|
|36LH09||57-0 through 60-0.|
|36LH10||NM through 60-0.|
|36LH11||NM through 60-0.|
|36LH12||NM through 60-0.|
|36LH13||NM through 60-0.|
|36LH14||NM through 60-0.|
|36LH15||NM through 60-0.|
NM = diagonal bolted bridging not mandatory.
(5) When permanent bridging terminus points cannot be used during erection, additional temporary bridging terminus points are required to provide stability. (See appendix C of this subpart.)
(d) Erection bridging.
(5) Where any steel joist specified in paragraphs (c)(2) and (d)(1), (d)(2), and (d)(3) of this section is a bottom chord bearing joist, a row of bolted diagonal bridging shall be provided near the support(s). This bridging shall be installed and anchored before the hoisting cable(s) is released.
(i) The bridging shall be indicated on the erection drawing;
(ii) The erection drawing shall be the exclusive indicator of the proper placement of this bridging;
(iv) When two pieces of bridging are attached to the steel joist by a common bolt, the nut that secures the first piece of bridging shall not be removed from the bolt for the attachment of the second; and
(e) Landing and placing loads.
(3) The weight of a bundle of joist bridging shall not exceed a total of 1,000 pounds (454 kg). A bundle of joist bridging shall be placed on a minimum of three steel joists that are secured at one end. The edge of the bridging bundle shall be positioned within 1 foot (.30 m) of the secured end.
(4) No bundle of decking may be placed on steel joists until all bridging has been installed and anchored and all joist bearing ends attached, unless all of the following conditions are met:
(ii) The bundle of decking is placed on a minimum of three steel joists;
(iii) The joists supporting the bundle of decking are attached at both ends;
(iv) At least one row of bridging is installed and anchored;
(v) The total weight of the bundle of decking does not exceed 4,000 pounds (1816 kg); and
(5) The edge of the construction load shall be placed within 1 foot (.30 m) of the bearing surface of the joist end.
The following state regulations pages link to this page.