Article 14. Construction Hoists
| Return to index New query |
§1604.13. Car and Counterweight Guide Members, Guide Member Supports, and Fastenings.
(a) Requirement for Guide Members.
Personnel hoists shall be provided with car and counterweight guide members.
(b) Material.
Guide member(s), guide member brackets, rail clips, fishplates, and their fastenings shall be of steel or other metals conforming to the requirements as follows:
(1) Members, Brackets, Fishplates, and Rail Clips.
Members, brackets, fishplates, and rail clips shall be made of open hearth steel, or its equivalent, having a tensile strength of not less than 55,000 lb./in.2 and having an elongation of not less than 22% in a length of 2 inches.
(2) Bolts.
Bolts shall conform to American National Standard Specification for Low Carbon Steel Externally and Internally Threaded Standard Fasteners, G38.5-1969 (ASTM A307-68), American National Standard Specification for High Strength Bolts for Structural Steel Joints, Including Suitable Nuts and Plain Hardened Washers, G38.6-1972 (ASTM A325-71a), or American National Standard Specification for Quenched and Tempered Alloy Steel Bolts for Structural Steel Joints, G24.19-1972 (ASTM A490-71).
(3) Rivets.
Rivets shall conform to American National Standard Specification for Steel Structural Rivets, G42.2-1968 (ASTM A502-65).
(4) Requirements for Metals Other Than Steel.
Metals other than steel may be used provided the factor of safety is not less than, and the deflections not more than, the values specified in Section 1604.13(b), and provided that cast iron is not used.
(c) Stresses and Deflections.
(1) Guide Members.
The stresses in a guide member, or in the member and its reinforcement, due to the horizontal forces imposed on the member during loading, unloading, or running, calculated without impact, shall not exceed 15,000 lb./in.2 based upon the class of loading, and the deflection shall not exceed 1/4-inch.
EXCEPTION: Where steels of greater strength than those specified under Section 1604.13(b) are used, the stresses specified may be increased proportionately based on the ratio of the ultimate strengths.
(2) Fastenings and Supports.
The guide member fastenings and supports shall be capable of resisting the horizontal forces imposed by the loading with a total deflection at the point of support not in excess of 1/8-inch.
(d) Overall Length of Guide Members.
The top and bottom ends of each run of guide member shall be so located in relation to the extreme positions of travel of the car and counterweight that the car and counterweight guide shoes or rollers cannot travel beyond the ends of the guide members.
(e) Guide Member Fastenings and Supports.
(1) Design and Strength of Fastenings and Supports.
The supports of the guide members, and the guide member fastenings, shall be of such design as to safely withstand the application of the car or counterweight safety when stopping the car and its rated load or the counterweight, and withstand the forces specified in Section 1604.13(c) within the deflection limits specified.
(2) Fastenings.
Guide member fastenings, when used, shall be secured to their supporting structure by means of structural bolts, clips, rivets, or by welding. Fastening bolts and bolt holes in fastenings and their supporting beams shall conform to the requirements of Section 1604.13(f). Welding shall conform to the requirements of American Welding Society Code D1.1.
(f) Type of Fastenings.
Guide members shall be secured by clips, rivets, bolts, or welds.
Bolts used for fastening shall be of such strength as to withstand the forces specified under Section 1604.13(c).
Welding, where used, shall conform to the requirements of American National Standard Z49.1-1973.
Go Back to Article 14 Table of Contents