ISO 11662-2:2014 移動式クレーン—クレーン性能の実験的決定—パート2：静的荷重下での構造能力 | ページ 2

Foreword

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The committee responsible for this document is ISO/TC 96, Cranes, Subcommittee SC 6, Mobile Cranes.

ISO 11662 consists of the following parts, under the general title Mobile cranes — Experimental determination of crane performance:

• Part 1: Tipping loads and radii
• Part 2: Structural competence under static loading

Introduction

When design calculations are made for mobile cranes, they are based on an ideal model in which all members and components are perfectly straight and fabrication has been exact. For tension members and members subjected to bending, the difference between the real crane and the ideal model is usually not significant. But, for compression members subject to column buckling, an allowance for deviation in straightness and fabrication is necessary.

When mobile cranes are tested non-destructively by means of strain gauges, the stresses determined intrinsically include these effects of deviations in straightness and accuracy of fabrication.

This test method is intended to describe the approximate maximum loading conditions to which any component of the entire load-supporting structure of a crane is subjected (See Annex D). In some cases, a more severe loading condition(s) can be indicated by analysis. In these cases, the more severe condition(s) can be added to or substituted for the specified test loading condition(s). This test method also classifies stress areas as Types I (Uniform Stress Areas), II (Stress Concentration Areas), III (Column Buckling Areas), and IV (Local Plate Buckling Areas; see Clause 10), and defines limits for each class. Results can be used to correlate boom system calculation results for Class III stress areas as given by boom system calculations. Test results for Class I stress areas throughout the structure can be used to check any available calculations. This test method evaluates Class II stress areas for which calculations are seldom available. Class IV stress areas ここで, disproportionately high stress readings can occur, can be reviewed for better insight by calculation methods.

A production boom system that has been rated by the methods of this part of ISO 11662 can be used on another machine without re-testing by the methods specified herein, provided the same analytical procedure shows its stress levels will be less than or equal to the stress levels in the original application, and provided that the supporting structure is as rigid as the original mounting. Rigidity of the supporting structure is determined by the change in the slope of the jib foot axis as test loads are applied.

1 Scope

This part of ISO 11662 applies to mobile construction-type lifting cranes utilizing

• a) rope supported, lattice boom attachment or lattice boom, and fly jib attachment (see Annex E, Figure E.3),
• b) rope supported, mast attachment and mast mounted boom, and fly jib attachment (see Annex E, Figures E.1 and E.2), or
• c) telescoping boom attachment or telescopic boom and fly jib attachment (see Figure E.4).

Mobile crane manufacturers can use this part of ISO 11662 to verify their design for the mobile crane types illustrated in Figures E.1 through E.4.

This test method is to provide a systematic, non-destructive procedure for determining the stresses induced in crane structures under specified conditions of static loading through the use of resistance-type electric strain gauges, and to specify appropriate acceptance criteria for specified loading conditions.

2 Normative references

The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.

3 Terms and definitions

For the purposes of this document, the following terms and definitions apply.

Bibliography