Washington Administrative Code › Title 296 - Labor and Industries, Department of › Chapter 296-155 - Safety standards for construction work › Part O - CONCRETE, CONCRETE FORMS, SHORING, AND MASONRY CONSTRUCTION › Section 296-155-680 - General provisions

Current through Register Vol. 24-14, July 15, 2024
(1)
General.
All equipment, material and construction techniques used
				in concrete construction and masonry work must meet the applicable requirements
				for design, construction, inspection, testing, maintenance and operations as
				prescribed in ANSI A10. 9-1997, Concrete and Masonry Work Safety
				Requirements.
(2)
Construction loads.
You must not place any construction loads on a
				concrete structure or portion of a concrete structure unless the employer
				determines, based on information received from a person who is qualified in
				structural design, that the structure or portion of the structure is capable of
				supporting the loads.
(3)
Vertical loads.
Vertical
				loads consist of a dead load plus an allowance for live load. The weight of
				formwork together with the weight of freshly placed concrete is dead load. The
				live load consists of the weight of workers, equipment, runways and impact, and
				must be computed in pounds per square foot (psf) of horizontal
				projection.
(4)
Lateral
				loads.
Braces and shores must be designed to resist all foreseeable
				lateral loads such as wind, cable tensions, inclined supports, impact of
				placement, and starting and stopping of equipment. The assumed value of load
				due to wind, impact of concrete, and equipment acting in any direction at each
				floor line must not be less than 100 pounds per lineal foot of floor edge or
				two percent of total dead load of the floor, whichever is greater. Wall forms
				must be designed for a minimum wind load of 10 psf, and bracing for wall forms
				should be designed for a lateral load of at least 100 pounds per lineal foot of
				wall, applied at the top. Walls of unusual height require special
				consideration.
(5)
Special
				loads.
Formwork must be designed for all special conditions of
				construction likely to occur, such as unsymmetrical placement of concrete,
				impact of machine-delivered concrete, uplift, and concentrated loads.
(6) You must check form supports and wedges
				during concrete placement to prevent distortion or failure.
(7)
Site access and layout.
The
				controlling contractor must ensure that the following is provided and
				maintained:
(a) Adequate access roads into
				and through the site for the safe delivery and movement of derricks, cranes,
				trucks, other necessary equipment, the material to be erected, and the means
				and methods for pedestrian and vehicular control.
Exception:
This requirement does not apply to roads outside of
							 the construction site.
(b)
				A firm, properly graded, and drained area, that is readily accessible to the
				work with adequate space for the safe assembly, rigging and storage of
				reinforcing and post-tensioning materials, and the safe operation of the
				reinforcing contractor's equipment.
(c)Adequate exterior platform for landing
				materials on the floors of multi-tiered buildings.
Exception:
Where the design, structure, or space constraint
							 precludes the installation of exterior platforms.
Exception:
Where the design of the structure allows for the
							 safe landing of materials without the exterior platform.
(d)
				Adequate protective system designed and constructed in accordance with Chapter
				155 Part N Excavation, Trenching, and Shoring prior to the commencement of
				reinforcing operations in excavations and/or trenches.