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GB/T 20863.1-2021 English PDF (GBT20863.1-2021)

GB/T 20863.1-2021 English PDF (GBT20863.1-2021)

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GB/T 20863.1-2021: Cranes -- Classification -- Part 1: General

GB/T 20863.1-2021
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 53.020.20
CCS J 08
GB/T 20863.1-2021 / ISO 4301-1:2016
Replacing GB/T 20863.1-2007
Cranes – Classification – Part 1: General
(ISO 4301-1:2016, IDT)
ISSUED ON: DECEMBER 31, 2021
IMPLEMENTED ON: JULY 01, 2022
Issued by: State Administration for Market Regulation;
Standardization Administration of the People’s Republic of China.
Table of Contents
Foreword ... 3
Introduction ... 6
1 Scope ... 7
2 Normative References ... 7
3 Terms and Definitions ... 7
4 Symbols ... 7
5 Use of Classification ... 8
5.1 General ... 8
5.2 Use of classification for commercial specification ... 8
5.3 Use of classification in the design ... 8
6 Classification of Crane Duty for the Crane as a Whole ... 9
6.1 General ... 9
6.2 Total number of crane working cycles ... 9
6.3 State of loading ... 10
6.4 Group classification ... 11
6.5 Average displacements ... 12
7 Classification of Components and Mechanisms ... 15
7.1 General ... 15
7.2 Total number of component working cycles ... 15
7.3 State of loading ... 16
7.4 Group classification ... 16
7.5 Average displacements ... 16
7.6 Accelerations per movement ... 16
7.7 Stress histories ... 17
Annex A (informative) Examples for average displacements ... 19
Annex B (informative) Guidance for the conversion of M-classes ... 20
Bibliography ... 22
Foreword
This Document was drafted as per the rules specified in GB/T 1.1-2020 Directives for Standardization – Part 1: Rules for the Structure and Drafting of Standardizing Documents. GB/T 20863 Cranes – Classification, together with GB/T 3811 Design Rules for Cranes, GB/T 22437 Cranes – Design Principles for Loads and Load Combinations, GB/T 30024 Cranes - Proof of Competence of Steel Structures, GB/T 30561 Cranes - Stiffness - Bridge and Gantry Cranes, etc. jointly constitute the basic national standard system for supporting crane design calculations.
This Document is Part 1 of GB/T 20863 Cranes – Classification. GB/T 20863 consists of the following parts:
--- Part 1: General;
--- Part 2: Mobile Cranes;
--- Part 3: Tower Cranes;
--- Part 4: Jib Cranes;
--- Part 5: Overhead Travelling and Portal Bridge Cranes.
This Part replaced GB/T 20863.1-2007 Cranes – Classification – Part 1: General. Compared with GB/T 20863.1-2007, the major technical changes of this Part are as follows besides the structural adjustments and editorial modifications:
--- Modify the scope, that is, add the classification method of average displacement (see Clause 1 of this Edition; Clause 1 of the 2007 Edition);
--- Add normative references (see Clause 2 of this Edition);
--- Add terms and definitions (see Clause 3 of this Edition);
--- Add symbols (see Clause 4 of this Edition);
--- Modify the content of classification purposes (see Clause 5 of this Edition; Clause 2 of the 2007 Edition);
--- Increase the relevant content of the average displacement classification of the whole crane (see 6.1 and 6.5 of this Edition);
--- Increase the range of the maximum number of working cycles with the crane service level U9 (see 6.2 of this Edition);
--- Modify the nominal value of the load spectrum coefficient of the crane and the corresponding load state level, that is, the nominal value of the load spectrum coefficient has been increased by 0.0313 and 0.0625, changing from 4 values to 6 values; the load state level is from Q1 to Q4 in total 4 levels are changed into 6 levels of QP0~QP5 (see 6.3 of this Edition; 3.2 of the 2007 Edition);
--- Modify the crane classification, from 8 levels A1~A8 to 15 levels A03~A11 (see 6.4 of this Edition; 3.3 of the 2007 Edition);
--- Delete the agency work level in the original document (see Clause 4 of the 2007 Edition); --- Increased crane parts work level (see Clause 7 of this Edition).
This Document uses translation method to equivalently adopt ISO 4301-1:2016 Cranes – Classification – Part 1: General.
The Chinese documents that have consistent correspondence with the international documents cited in this document are as follows:
--- GB/T 6974.1-2008 Cranes - Vocabulary - Part 1: General (ISO 4306-1:2007, IDT); --- GB/T 6974.2-2017 Cranes - Vocabulary - Part 2: Mobile cranes (ISO 4306-2:2012, IDT); --- GB/T 6974.3-2008 Crane - Vocabulary - Part 3: Tower crane (ISO 4306-3:2003, IDT); --- GB/T 6974.5-2008 Cranes - Vocabulary - Part 5: Bridge and gantry cranes (ISO 4306- 5:2005, IDT).
This Document made the following editorial modifications:
--- The average angular displacement in Table 7 has a proportional relationship. There is an error in "11.75" in the original text, and it is revised to "11.25";
--- Considering that Annex B is not mentioned in the main text; the content “See Annex B for the conversion guidance of the agency work level” is added to 7.4;
--- 6.4 “Work level of the whole machine” quoted in 7.5 “average displacement” of the original text is inconsistent with the actual content of this Clause; and is revised to quote 6.5 "average displacement";
--- The international documents in the Bibliography are replaced by Chinese documents with the same degree of consistency; and according to the citations in Annex B, GB/T 20863.1-2007 Cranes - Classification - Part 1: General is added.
Please note some contents of this Document may involve patents. The issuing agency of this Document shall not assume the responsibility to identify these patents. This Document was proposed by China Machinery Industry Federation.
Cranes – Classification – Part 1: General
1 Scope
This Document establishes a general classification of cranes and mechanisms based on the service conditions, mainly expressed by the following parameters:
— the total number of working cycles to be carried out during the specified design life of the crane;
— the load spectrum factor which represents the relative frequencies of loads to be handled; — the average displacements.
This Document is applicable to the cranes defined in ISO 4306.
2 Normative References
The provisions in following documents become the essential provisions of this Document through reference in this Document. For the dated documents, only the versions with the dates indicated are applicable to this Document; for the undated documents, only the latest version (including all the amendments) is applicable to this Document.
ISO 4306 (all parts) Cranes - Vocabulary
3 Terms and Definitions
For the purposes of this Document, the following terms and definitions given in ISO 4306 apply. 4 Symbols
The main symbols used in this document are given in Table 1.
Crane operation gives rise to stress or load histories in crane structures and components (e.g., wire ropes, slewing bearings, or wheels and rails). These histories may be classified for the particular component. The method of determining this classification is set out in the appropriate standards, e.g., for structures in GB/T 30024.
6 Classification of Crane Duty for the Crane as a Whole
6.1 General
Crane duties are determined by the following parameters:
a) the total number of working cycles during the design life;
b) the relative frequencies of loads to be handled (load spectrum, state of loading); c) the average displacements.
When the classified ranges of parameters are used, the design shall be based on the maximum values of the parameters within the specified classes. Use of an intermediate value for a parameter is permissible, but in that case this design value shall be determined and indicated instead of the class.
6.2 Total number of crane working cycles
For the purpose of classification, a crane working cycle is a sequence of movements which commences when the crane is ready to hoist the load and ends when the crane is ready to hoist the next load within the same task. A task, r, can be characterized by a specific combination of crane configuration and sequence of intended movements.
In certain specific tasks for which cranes are used, for example, bulk unloading by grab, the number of cycles can readily be derived from a knowledge of the total number of working hours and the number of operating cycles per hour. In other cases, for example, mobile cranes, the number is less easy to determine because the crane is used in a variety of duties and it becomes necessary to estimate suitable values on the basis of experience. The total number of working cycles, C, is the sum total of all working cycles during the design life of the crane. The total number of crane working cycles during the design life of a crane can be separated into the numbers of working cycles corresponding to several typical tasks.
The total number of crane working cycles is related to the frequency of use (e.g. daily) and the intended life (in years) of the crane. For convenience, the range of the total number of crane working cycles has been divided into 10 classes of utilization in Table 2.

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