Said assembly comprises a wear pad (116) having a first side for contacting an outer wall of the inner section (14) of the boom (10), and a second side facing an inner wall of the outer section (12) of the boom (10). SOLUTION: In a telescopic crane boom supporting structure for storing the booms of plural stages inside the respective booms sequentially increased in sectional areas and extending/contracting a stored side boom 22 from a storing side boom 23 by simultaneous telescopic system using a hydraulic cylinder and wire rope, a sheave 31 around which the wire rope 30 used by the simultaneous telescopic system is wrapped is arranged inside the storing side boom 23 oppositely to the upper corner part of the stored side boom 22 in the boom tip side P1 rather than the arranging position P2 of the sheave 31 in the tip of the boom 23 provided with a rotary shaft placed in a horizontal direction, and a slide plate having a shaped to be brought into contact with the upper corner part is provided.Ībstract: A wear pad assembly is disclosed for mounting between an inner and an outer section of a telescopic boom. TL DR: In this article, a telescopic crane boom supporting structure for storing the booms of plural stages inside the respective booms sequentially increased in sectional areas and extending/contracting a stored side boom 22 from a storing side boom 23 by simultaneous telescopic system using a hydraulic cylinder and wire rope is provided.Ībstract: PROBLEM TO BE SOLVED: To provide a telescopic crane boom structure capable of suppressing the section deformation of the boom and preventing an increase in the structure or weight of the boom.

Boom radius of crane