California Code of Regulations › Title 8 - Industrial Relations › Division 1 - Department of Industrial Relations › Chapter 4 - Division of Industrial Safety › Subchapter 4 - Construction Safety Orders › Article 14 - Construction Hoists › Section 1604.7 - Overhead Beams, Foundations, and Flooring over Hoistway

Current through Register 2024 Notice Reg. No. 28, July 12, 2024
(a) Overhead Beams and Foundations.
Overhead beams and foundations for the direct support of
						the machinery or sheaves, or both, shall conform to the following
						requirements:
(1) Beams and Supports
					 Required.
Machines, machinery, and sheaves shall be so supported
						and maintained in place as to effectually prevent any part from becoming loose
						or displaced under the conditions imposed in service.
Supporting beams, if used, shall be of steel or
						reinforced concrete. Beams are not required under machines, sheaves, and
						machinery or control equipment which are supported on floors, provided such
						floors are designed and installed to support the load imposed
						thereon.
(2) Overhead Beams,
					 Floors, and Their Supports.
Overhead beams, floors, and their supports shall be
						designed for not less than the sum of the following loads:
(A) The load resting on the beams and
					 supports which shall include the complete weight of the machine, sheaves,
					 controller, governor, and any other equipment, together with that portion, if
					 any, of the machine room floor supported thereon.
(B) Twice the sum of the tensions in all wire
					 ropes supporting the car, passing over sheaves or drums supported by the beams,
					 with rated load in the car.
(3) Foundations, Beams, and Floors for
					 Machinery and Sheaves Not Located Directly Over the Hoistway.
For machines and sheaves located below, or at the sides
						of, the hoistway, the foundation for the machine and sheave beams and their
						supports shall be designed to withstand loads as follows:
(A) The foundation shall support the total
					 weight of the machine, sheaves, and other equipment, and the floor, if
					 any.
(B) The sheave beams and the
					 foundation bolts shall withstand twice the vertical component of the tensions
					 in all hoisting ropes passing over sheaves or drums on the foundation or beams,
					 less the weight of the machine or sheaves.
(C) The sheave beams and the foundation bolts
					 shall withstand twice the horizontal component, if any, of the tensions in all
					 hoisting ropes passing over sheaves or drums on the foundation or
					 beams.
(D) The foundation shall
					 withstand twice the overturning moment, if any, developed by the tensions in
					 all the hoisting ropes passing over sheaves or drums on the foundation or
					 beams.
(4) Securing of
					 Machinery and Equipment to Beams, Foundations, or Floors.
(A) Overhead Beams and Floors.
Machinery or equipment shall be secured to, and supported
						on or from the top of, overhead beams or floors.
EXCEPTIONS:
1.
					 SECONDARY OR DEFLECTING SHEAVES OF TRACTION HOISTS.
2. DEVICES AND THEIR ACCESSORIES FOR LIMITING
					 OR RETARDING CAR SPEED.
(B) Beams or Foundations Supporting Machinery
					 and Sheaves Not Located Directly Over the Hoistway.
Machines and sheaves located below, or at one side of, a
						hoistway shall be anchored to beams, foundations, or floors with bolts, shall
						conform to American National Standard Specification for Low-Carbon Steel
						Externally and Internally Threaded Standard Fasteners, G38.5-1969 (ASTM
						A307-68), and shall be of sufficient size and number to withstand the
						applicable load conditions specified under Section
						1604.7(a)(2).
						Based on these initial loads, total tension in anchor bolts shall not exceed
						12,00 lb./in.2 of net section, and the total shear
						shall not exceed 8,600 lb./in.2 of actual area in
						the shear plane. Where bolts are used through sloping flanges of structural
						shapes, the bolt heads shall be of the tipped or beveled-head type or shall be
						fitted with beveled steel washers, and nuts on sloping flanges shall seat on
						beveled steel washers.
EXCEPTION: Bolts made of steel having a greater strength
						than that specified by American National Standard G38.5-1969 (ASTM A307-68) may
						be used and the maximum allowable stresses increased proportionally based on
						the ratio of the ultimate strengths. Elongation must conform to the
						requirements of the corresponding American National Standard.
(C) Overhead Hoisting Rope Hitches.
Where hoisting ropes are secured to the structure above a
						hoistway, the hitch plates and hitch plate blocking beams, where used, shall be
						secured to, and mounted on top of, overhead beams, machine beams, or on top of
						auxiliary beams connected to the webs of overhead beams. Hitch plates, blocking
						beams or auxiliary beams shall be secured by bolting, riveting, or welding, and
						shall be so located that the tension in the hoisting ropes will not develop
						direct tensions in the bolts or rivets. Bolts shall conform to American
						National Standard G38.5-1969 (ASTM A307.68), American National Standard
						Specification for High Strength Bolts and Structural Steel Joints, Including
						Suitable Nuts and Plain Hardened Washers, G38.6-1972 (ASTM A325-71a), or
						American National Standard Specifications for Quenched and Tempered Alloy Steel
						Bolts for Structural Steel Joints, G24.19-1972 (ASTM A490-71). Rivets shall
						conform to American National Standard Specification for Steel Structural
						Rivets, G42.2-1968 (ASTM A502-65). Welding shall conform to American Welding
						Society, Structural Welding Code D1.1. Where bolts and rivets are subject to
						shearing stresses due to tensions in the hoist ropes, the total shear shall not
						exceed 8,600 lb./in.2 of actual area in the shear
						plane. Except where friction-type connections are used in accordance with
						American National Standard G38.6-1972 (ASTM A325-71a) and American National
						Standard G24.19-1972 (ASTM A490-71), the allowable stresses per Section
						1604.7(a)(5)(A)
						shall be used.
The stresses in welds due to tensions in the hoisting
						ropes shall not exceed 12,000 lb./in.2 based on the
						throat area of the weld.
The hitch plate supporting beams shall be designed to
						withstand twice the sum of the tension in all hoisting ropes attached to the
						hitch plates.
Total stresses in tension plus bending in hitch plates
						and hitch plate shapes shall not exceed 12,000
						lb./in.2
EXCEPTION: Bolts made of steel having a greater strength
						than specified by American National Standard G38.5-1969 (ASTM A307-68) may be
						used and the maximum allowable stresses increased proportionally based on the
						ratio of the ultimate strengths. Elongation must conform to the requirements of
						the corresponding American National Standard.
(D) Cast Metals in Tension or Bending.
Cast metals having an elongation of less than 20% in a
						length of 2 inches, which are subject to tension or bending, shall not be used
						to support machinery or equipment from the underside of overhead beams or
						floors.
(5)
					 Allowable Stresses for Machinery and Sheave Beams, or Floors and Their
					 Supports.
The unit stresses for all machinery and sheave beams, and
						floors and their supports, based on the loads computed as specified under
						Section 1604.7(a)(2),
						shall not exceed 80 percent and the unit stresses in tower or mast structures
						shall not exceed one hundred percent of those permitted for static loads by the
						following standards:
(A) Structural
					 Steel.
AISC Specification for the Design, Fabrication and
						Erection of Structural Steel for Building.
(B) Reinforced Concrete.
Building Code Requirements for Reinforced Concrete ANSI
						A89.1 (ACI 318).
Where stresses due to loads other than hoist loads,
						supported on the beams or floor, exceed those due to the hoist loads, 100
						percent of the permitted stresses may be
						used.