Presentation on theme: "1926 Subpart R Part IHistory of SENRAC Part IIHighlights of proposed standard Part IIIIf time permits overview of Directive."— Presentation transcript:
1926 Subpart R Part IHistory of SENRAC Part IIHighlights of proposed standard Part IIIIf time permits overview of Directive
OSHAs S S teel E E rection N N egotiated R R ulemaking A A dvisory C C ommittee
What is SENRAC? The Steel Erection Negotiated Rulemaking Advisory Committee (SENRAC) consists of representatives of employers and employees that will be significantly affected by the proposed rule covering steel erection in construction. The Committee began negotiations in June of 1994.
Purpose of SENRAC The committee's purpose is to; - resolve issues - arrive at a consensus, and - develop a proposed rule governing steel erection.
Participation Appointees to the Committee include representatives from labor, industry, public interests and government agencies. Many interested parties have attended the public meetings and have participated in the workgroups established by SENRAC.
Members of the committee Army Corps of Engineers Ben Hur Construction Company Regional Administrator International Association of Bridge, Structural & Ornamental Iron Workers; International Association of Bridge, Structural & Ornamental Iron workers; El Paso Crane & Rigging, Inc.; International Brotherhood of Boilermakers, Iron Ship Builders, Blacksmiths, Forgers & Helpers; Network, Inc.; Building and Construction Trades Department (AFL-CIO) Black & Veatch; United Steelworkers of America; Gilbane Building Company; Williams Enterprises of Georgia, Inc.; Holton & Associates, Ltd.; CAL/OSHA; International Association of Bridge, Structural & Ornamental Iron Workers; International Union of Operating Engineers; National Institute for Occupational Safety and Health (NIOSH) C. Rockwell Turner-L.P.R. Construction Co.; National Erectors Association.
Highlights of OSHAs New Proposed Steel Erection Standard 1926 Subpart R - Steel Erection
Scope and Application
(a) Scope –Hazards associated with steel erection activities: Single & multi-story buildings Bridges Other structures where steel erection occurs Scope and Application
(b) Application –Hoisting –Connecting –Welding –Connecting –Bolting –Rigging structural steel –Steel joists and metal buildings –Installing metal deck, siding systems –Miscellaneous metals –Ornamental iron –Similar metals –Moving point to point Scope and Application
Definitions Controlling Employer
Site layout, site-specific erection plan and construction sequence
(a) Approval to begin steel erection Controlling employer Concrete curing (b) Site layout Access roads Work area properly maintained (c) Overhead protection Preplanned hoisting operation (d) Site-specific erection plan Employer elects to develop alternate means of protection Site layout, site-specific erection plan and construction sequence.
Hoisting and Rigging
Hoisting and rigging. (a) General Pre-shift visual inspection of cranes (b) Working under loads. Preplanned routes for suspended loads –Exceptions EEs making initial connection Rigged to prevent material displacement (c) Multiple lift rigging procedure.
Pre Shift Visual Inspections
Working under the load Pre planned routes for suspended loads
Promotes crane safety by including elements of current ANSI B Exception to working under loads: riggers making initial attachments securing load
Two connectors were erecting lightweight steel "I" beams on the third floor of a 12-story building, 54 feet above the ground. One employee removed a choker sling from a beam and then attempted to place the sling onto a lower empty hook on a series of stringers. While the crawler tower crane was booming away from the steel, the wind moved the load line and stringer into the beam the employee was standing on. The beam moved while the employee was trying to disengage the hook, and fell to his death. Multiple lift
"Multiple lift rigging."
Structural steel assembly
Structural steel assembly. (a) Structural stability shall be maintained at all times during the erection process –(1) The permanent floors shall be installed as the erection of structural members progresses, and there shall be not more than eight stories between the erection floor and the upper-most permanent floor, except where the structural integrity is maintained as a result of the design. –(2) At no time shall there be more than four floors or 48 feet (14.6 m), whichever is less, of unfinished bolting or welding above the foundation or uppermost permanently secured floor, except where the structural integrity is maintained as a result of the design. –(3) A fully planked or decked floor or nets shall be maintained within 2 stories or 30 feet (9.1 m), whichever is less, directly under any erection work being performed.
(d) Plumbing-up Connections used properly secured Removed only with approval of competent person
Structural steel assembly (continued) (e) Decking. Hoisting, landing & placing of deck bundles –Strapping –Roof and floor openings. –Space around columns. –Floor decking. –Derrick floors. Hoisting, landing & placing of deck bundles
Anchor bolts. (a) General requirements for erection stability. (b) Repair, replacement or field modification.
Beams and columns
Beams and columns. (a) General Load shall not be released until final members secured by at least two bolts per connection, drawn wrench tight per project structural engineer of record (b) Diagonal bracing Secured by at least one bolt per connection
(c) Double connections at columns and/or at beam webs over a column Common connection holes Beams and columns. (continued)
An employee was assigned to connect the X-braces at the end of 40-foot long bar joists. Only one end of the bar joist he was working on had been welded. The employee was sitting on the unwelded end of the bar joist trying to connect the X-braces. He lost his balance, dislodging the bar joist from its end support, and fell approximately 24 feet to his death. Steel Erection Operation
Five iron workers were distributing 90-foot-long open web bar joists on a building under construction. The bar joists were supported by vertical columns spaced 30 feet apart. The steel columns were not framed in at least two directions and the bar joists were not field bolted to the vertical columns to prevent collapse. The bar joists shifted, causing the vertical columns to lean. This caused entire section of columns and pen web bar joists to collapse. Two employees rode the iron down. One was fatally injured and one received serious injuries. Steel Erection Operation
Open web steel joists (a) General. (b) Attachment of steel joists and steel joist girders. (c) Erection of steel joists. (d) Erection bridging.
Open web steel joists
Pre-engineered metal buildings
Erection shall not begin until site has been completed Anchored by minimum of 4 anchor bolts Rigid framed - 50 percent bolts installed Pre-engineered metal buildings