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GB/T 19924-2021 English PDF

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GB/T 19924-2021: Mobile cranes - Determination of stability
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GB/T 19924: Evolution and historical versions

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GB/T 19924-2021English304 Add to Cart 3 days [Need to translate] Mobile cranes - Determination of stability Valid GB/T 19924-2021
GB/T 19924-2005English319 Add to Cart 3 days [Need to translate] Mobile cranes -- Determination of stability Obsolete GB/T 19924-2005

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Basic data

Standard ID GB/T 19924-2021 (GB/T19924-2021)
Description (Translated English) Mobile cranes - Determination of stability
Sector / Industry National Standard (Recommended)
Classification of Chinese Standard J80
Word Count Estimation 16,150
Issuing agency(ies) State Administration for Market Regulation, China National Standardization Administration

GB/T 19924-2021: Mobile cranes - Determination of stability

---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Mobile cranes-Determination of stability ICS 53.020.20 CCSJ80 National Standards of People's Republic of China Replace GB/T 19924-2005 Determination of the stability of mobile crane (ISO 4305.2014, IDT) Released on 2021-04-30 2021-11-01 implementation State Administration of Market Supervision and Administration Issued by the National Standardization Management Committee

Table of contents

Foreword Ⅲ 1 Scope 1 2 Normative references 1 3 Terms and definitions 1 4 Calculation of stability 2 4.1 General 2 4.2 Stability criterion 2 4.3 Back roll stability (with or without main boom) 4 4.4 Stability under non-operating wind loads 5 4.5 Determination of stability 5 Appendix A (informative) The tipping line of mobile cranes 6 Appendix B (informative) The tipping angle of mobile cranes 10

Foreword

This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for Standardization Work Part 1.Structure and Drafting Rules of Standardization Documents" Drafting. This document replaces GB/T 19924-2005 "Determination of the stability of mobile cranes", compared with GB/T 19924-2005, except In addition to structural adjustments and editorial changes, the main technical changes are as follows. ---Added terms and definitions (see Chapter 3); ---The stability calculation of crawler crane is changed from "not greater than 0.4m/s" to "not greater than 0.1m/s" and "greater than 0.1m/s and not greater than More than 0.4m/s" two requirements (see Table 1, Table 2,.2005 Edition of Table 1, Table 2); ---The value of the wind load in the stability calculation has increased the sub-item safety factor S (see Table 2); ---Added the requirement of the minimum crane tipping angle (see Table 3); ---The back roll stability is modified to two requirements with and without the main boom (see 4.3, 3.3 in the.2005 edition); ---Added the criteria for determining the tipping angle of mobile cranes (see 4.5.4, Appendix B); ---The tipping line of the crawler crane's end is modified to be determined separately according to whether the driving wheel or the guide wheel is off the ground (see Figure A.5,.2005) Version of Figure A.5). The translation method used in this document is equivalent to ISO 4305.2014 "Determination of Mobile Crane Stability" and ISO 4305.2014/ Amd.1.2016 "Determining Amendment to the Stability of Mobile Cranes 1". The Chinese documents that have consistent correspondence with the normatively cited international documents in this document are as follows. ---GB/T 6974.1-2008 Crane Terminology Part 1.General Terminology (ISO 4306-1.2007, IDT) ---GB/T 6974.2-2017 Crane Terminology Part 2.Mobile Cranes (ISO 4306-2.2012, IDT) Compared with ISO 4305.2014, this document has editorial changes as follows. --- Added "hereinafter referred to as crane" (see Chapter 1); --- Deleted the source description of the term "fixed-length arm" "with modification, the English phrase'whichlength' was changed to'thelengthof' which'” description (see 3.1). Please note that some of the contents of this document may involve patents. The issuing agency of this document is not responsible for identifying patents. This document was proposed by China Machinery Industry Federation. This document is under the jurisdiction of the National Hoisting Machinery Standardization Technical Committee (SAC/TC227). This document was drafted by. Zoomlion Heavy Industry Co., Ltd., National Construction Machinery Quality Supervision and Inspection Center, Changsha Zoomlion Hengtong Machinery Co., Ltd. Limited company, Shenzhen Special Equipment Safety Inspection and Research Institute. The main drafters of this document. Liu Yuxin, Luo Kai, Wang Yani, Liu Jinsong, Yang Wu, Zhang Yuzhu, Yang Wei, Cui Hanlong, Jiang Xu, Tu Lingzhi, Li Jun. This document was first published in.2005, and this is the first revision. Determination of the stability of mobile crane

1 Scope

This document specifies various conditions that should be considered to verify the stability of mobile cranes through calculations. Flat supporting surface (the inclination is not more than 1%). This document applies to mobile cranes defined in ISO 4306-2 (except for truck-mounted cranes, hereinafter referred to as cranes), that is. installed on the truck A crane with or without outriggers on wheels (tires) or crawlers.

2 Normative references

The contents of the following documents constitute the indispensable clauses of this document through normative references in the text. Among them, dated quotations Only the version corresponding to that date is applicable to this document; for undated reference documents, the latest version (including all amendments) is applicable to This document. GB/T 5905-2011 Crane test specifications and procedures (ISO 4310.2009, IDT) ISO 4302 Cranes-Windloadassessment (Cranes-Windloadassessment) ISO 4306-1 Crane Terminology Part 1.General Terminology (Cranes-Vacabulary-Part 1.General) ISO 4306-2 Crane Terminology Part 2.Mobile Cranes (Cranes-Vacabulary-Part 2.Mobile cranes)

3 Terms and definitions

The following terms and definitions defined by ISO 4306-2 (except for main boom, jib and post boom) and the following apply to this document. 3.1 Fixed-lengthboom The length of the boom with a fixed working length can be changed by adding or reducing the intermediate boom section, but it cannot be during the working cycle. change. [Source. ISO 4306-2.2012,4.1] 3.2 Latticeboom Fixed length arm of truss structure. [Source. ISO 4306-2.2012,4.1.1] 3.3 Telescopingboom It is composed of a basic boom and one or more boom sections arranged therein, and a boom frame whose length is changed by the expansion and contraction of the boom section. [Source. ISO 4306-2.2012,4.2] 3.4 Column boom (tower boom) mast-mountedboom A boom mounted at or near the end of a vertical or nearly vertical main boom. Note. The angle between the main boom and the column boom can be changed during operation. [Source. ISO 4306-2.2012,4.3] 3.5 Flyjib Mounted on or near the end of the main boom or column boom to increase the length and assist the lifting boom. Note. There is a certain angle between the jib and the main arm. [Source. ISO 4306-2.2012,4.4] 3.6 Tippingangle The angle formed by the vertical plane of the tipping line (fulcrum) and the plane of the tipping line (fulcrum) and the center of gravity of the crane. Note 1.See Figure B.1~Figure B.6. Note 2.When calculating the overall center of gravity of the crane load, consider the lifting load acting on the center of the pulley at the main boom or the jib end.

4 Calculation of stability

4.1 General The calculation should verify that the crane is stable under the following conditions. a) The criteria specified in Table 1; b) The criteria specified in Table 2; c) The criteria specified in Table 3; d) Backflip stability (see 4.3); e) Stability under non-working wind loads (see 4.4). 4.2 Stability criterion 4.2.1 See Table 1, Table 2 and Table 3 for stability criteria. 4.2.2 Based on the criteria specified in Table 1, Table 2 and Table 3, consideration should be given to the amount of crane stability determined when the minimum wind speed is 8.3m/s. Set the weight. In special cases, the manufacturer should clearly indicate the maximum wind speed used in the stability calculation. Table 1 Stability calculation under applied load 4.3 Back roll stability (with or without main arm) 4.3.1 General The crane is under the following conditions, and the balance weight should be limited to the mass distribution position given below to ensure that the crane has a reasonable stability Safety factor. --- Placed on a solid, level supporting surface (the inclination is not more than 1%); --- Equipped with the specified shortest main boom, and is at the maximum elevation angle of the boom; ---The hook, hook pulley block or other spreaders are placed on the ground; ---Without main arm; ---The outriggers leave the supporting surface and are calculated according to the crane supported on the wheels (tires); --- Equipped with the specified longest main boom or main boom plus jib, at the maximum elevation angle allowed by the combined boom, and assumed to withstand the most unfavorable direction Working wind load. The principle of crane mass distribution is. under each balance weight condition, it should meet the most unstable crane rotation allowed by the manufacturer position. 4.3.2 Crawler crane---the shortest main boom and the minimum working range 4.3.2.1 Crawler cranes---general The total load on the tipping line of the side or end of the chassis supporting the smallest load shall not be less than 15% of the total gravity of the crane. For a crawler crane equipped with a retractable crawler device, if the crawler device cannot meet the above requirements when the crawler device is retracted, the manufacturer shall Drivers are provided with conspicuous warning information on board. 4.3.2.2 Crawler crane-without main boom The total load on the tipping line of the side or end of the chassis supporting the smallest load shall not be less than 5% of the total gravity of the crane. For a crawler crane equipped with a retractable crawler device, if the crawler device cannot meet the above requirements when the crawler device is retracted, the manufacturer shall Drivers are provided with conspicuous warning information on board. 4.3.3 Wheeled cranes---the shortest main boom and the minimum working range 4.3.3.1 Wheeled cranes---general When the longitudinal axis of the upper structure of the crane is 90° with the longitudinal axis of the chassis, the wheel (tire) or outrigger under the crane boom The total load on the crane should not be less than 15% of the total gravity of the crane. When the longitudinal axis of the slewing mechanism on the crane coincides with the longitudinal axis of the chassis, the light-load end of the chassis is within the working area specified by the manufacturer The total load on wheels (tyres) or legs shall not be less than 15% of the total gravity of the crane. In the non-working area, it should not be less than the total crane 10% of mass gravity. Unless eye-catching warning information is provided for the operator on the crane, the relevant regulations on the wheels (tires) of the crane shall be met. In order to ensure sufficient backflip stability, the warning message should indicate the requirements for the extended state of the outriggers. 4.3.3.2 Wheeled crane-without main boom When the longitudinal axis of the upper structure of the crane is 90° with the longitudinal axis of the chassis, the wheel (tire) on the side of the chassis that bears the smaller load Or the total load on the outriggers should not be less than 5% of the total gravity of the crane. When the longitudinal axis of the upper structure of the crane revolves coincides with the longitudinal axis of the chassis, the chassis is lightly loaded in the working area specified by the manufacturer The total load on the end wheel (tyre) or outrigger shall not be less than 5% of the total gravity of the crane. In the non-working area, it should not be smaller than the crane 5% of the total mass gravity. Unless eye-catching warning information is provided for the operator on the crane, it should be satisfied that the crane is on the wheels (wheels). Tires). In order to ensure sufficient backflip stability, the warning message should indicate the requirements for the extended state of the outriggers. 4.4 Stability under non-operating wind loads The manufacturer shall specify the special precautions to be taken when the crane is not working, and the working limit of the wind load (wind load For regulations, see ISO 4302). 4.5 Determination of stability 4.5.1 Under the load conditions specified in Table 1 and Table 2, the value of P shall be such that the crane tipping moment is less than the stable moment in any case. 4.5.2 The stability should be calculated according to the most unfavorable position of the crane. In addition, all loads, balance weights, and accessories that affect the stability of the crane The most unfavorable value and position should be taken into consideration. 4.5.3 Refer to Appendix A for the tipping lines of different types of cranes and the tipping lines relative to the calculated stable moment. The tipping line in Appendix A is just It is indicated that the actual tipping line should be determined according to the specific design situation. 4.5.4 Crane tipping angle. When calculating the crane turning to the most unstable direction, the tipping angle of different configurations and different rated lifting weights should be calculated. Greater than or equal to the minimum value given in Table 3.For tilting angle α, refer to Figure B.1 to Figure B.6 of Appendix B. When calculating the rear tipping angle, the crane should be installed With the main (auxiliary) boom, the hook should be placed on the ground.

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