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 1604.16 - Car Frames and Platforms
Current through Register 2024 Notice Reg. No. 38, September 20, 2024
(a) Requirement for Car Frames.
Every hoist car shall have a frame. The car frame and platform may be an integral part of the car construction.
(b) Guide Members.
Car frames shall be guided on each guide member by upper and lower guide shoes or rollers attached to the frame.
(c) Design of Car Frames and Guide Shoes or Rollers.
The frame and its guide shoes or rollers shall be designed to withstand the forces resulting under the loading conditions for which the hoist is designed.
(d) Underslung or Subpost Car Frames.
The vertical distance between the top and bottom guide shoes of a hoist car having a subpost car frame, or having an underslung car frame located entirely below the car platform, shall be not less than 40% of the distance between guide rails.
(e) Car Platforms.
Every car shall have a platform consisting of a nonperforated floor attached to a platform frame supported by the car frame and extending over the entire area within the car enclosure. The platform frame members and the floor shall be designed to withstand the forces developed under the loading conditions for which the hoist is designed and installed.
(f) Materials for Car Frames and Platform Frames.
EXCEPTION: Exceptions are guide rollers, guide shoes and compensating rope anchorages.
EXCEPTION: Steels of greater strength than those specified may be used provided they have an elongation of not less than 22% in a length of 2 inches and provided that the stresses and deflections conform to the requirements of Sections 1604.16(h) and 1604.16(i), respectively.
Steel shall be rolled, forged, or cast, conforming to the requirements of the following American National Standards:
Steel used for rivets, bolts, and rods shall conform to the following American National Standards:
(g) Car Frame and Platform Connections.
Connections between members of car frames and platforms shall be riveted, bolted, or welded, and shall conform to the following requirements:
Nuts, used on sloping flanges of structural members, shall seat on beveled washers.
Welding of parts upon which safe operation depends shall be performed in accordance with the requirements of the American Welding Society D1.1. At the option of the manufacturer, the welders may be qualified by one of the following:
EXCEPTION: Tack welds not later incorporated into finished welds carrying calculated loads are an exception.
Table 1 Maximum Allowable Stresses* in Car-Frame and Platform Members and Connections, for Steels Specified in Sections 1604.16(f) (3) (A) and 1604.16 (f) (3) (B) |
|||
Member |
Type of Stress |
Maximum Stress (psi) |
Area Basis |
Car crosshead.......................... |
Bending |
12,500 |
Gross section |
Car-frame plank, normal loading.......................... |
Bending |
12,500 |
Gross section |
Car-frame plank, buffer reaction.......................... |
Bending |
25,000 |
Gross section |
Car-frame uprights (stiles).......................... |
Bending plus |
15,000 |
Gross section |
tension |
18,000 |
Net section |
|
Hoisting-rope hitch.......................... |
Bending plus | ||
shapes or plates.......................... |
tension |
8,000 |
Net section |
Platform framing.......................... |
Bending |
12,500 |
Gross section |
Platform stringer.......................... |
Bending |
15,000 |
Gross section |
Threaded brace rods and other tension members except bolts.......................... |
Tension |
8,000 |
Net section |
Bolts.......................... |
Tension |
7,000 |
Net section |
Bolts in clearance holes.......................... |
Shear |
7,000 |
Actual area in shear plane |
Bolts in clearance holes.......................... |
Bearing |
16,000 |
Gross section |
Rivets or tight body fit bolts.......................... |
Shear |
10,000 |
Actual area in shear plane |
Rivets or tight body-fit bolts.......................... |
Bearing |
18,000 |
Gross section |
Any framing member, normal loading.......................... |
Compression |
14,000 59L |
Gross section |
R |
* Stresses shall be determined on the basis of a uniformly distributed load over the entire area of the car platform or a single concentrated load placed at the center of the car platform.
(h) Maximum Allowable Stresses in Car Frame and Platform Members and Connections.
The stresses in car frame and platform members and their connections, based on the static load imposed upon them, shall be as follows:
(i) Maximum Allowable Deflections of Car Frame and Platform Members.
The deflections of car frame and platform members based on the static load imposed upon them, shall be not more than the following:
where
I = moment of inertia of member, gross section, in4
K = turning moment, in inch-pounds
L = free length of uprights, in inches
E = modules of elasticity
H = vertical center distance between upper and lower guide shoes
(j) Car Frames With Crosshead Sheaves.
Where a hoisting rope sheave is mounted on the car frame, the construction shall conform to the following requirements:
(k) Hoisting Rope Hitch Plates or Shapes.
Where cars are suspended by hoisting ropes attached to the car frame by means of rope shackles, the shackles shall be attached to steel hitch plates or to structural or formed steel shapes. Such plates or shapes shall be secured to the underside or to the webs of the car frame member with bolts, rivets or welds so located that the tensions in the hoisting ropes will not develop direct tension in the bolts or rivets. The stresses shall not exceed those permitted in Section 1604.7(a)(3)(C).
(l) Platform Side Braces.
Where side bracing and similar members are attached to car frame uprights, the reduction in area of the upright shall not reduce the strength of the upright below that required by Section 1604.16.
1. Editorial correction of subsection (f)(2) (Register 2010, No. 34).