GB/T 28757-2012Cranes other than mobile, tower and floating cranes and tower cranes -- General requirements for stability (English PDF)

3.2.2 and modify the terms of this standard number 3.2.2 and 3.2.3 respectively.

The standard proposed by China Machinery Industry Federation.

This standard by the National Standardization Technical Committee crane (SAC/TC227) centralized.

This standard was drafted. Dalian University of Technology, Beijing Materials Handling Machine Design and Research Institute, the National Quality Supervision and Inspection handling equipment

center.

3.1 Calculation

3.1.1 When the stabilizing torque crane algebra and algebra when greater than tipping moment is that the crane is stable.

3.1.2 Table 1 should be used to value the stability of algebra and checksum calculation of the crane tipping moment.

In all calculations, the role and position of the crane components, all loads and forces shall be according to the most unfavorable combination of direction and action

To consider.

3.1.3 crane inclined surface work, the manufacturer in the calculation of the stability, the conditions should be given consideration.

3.1.4 Press with load crane design, calculation, in addition to Table 1 Condition II predetermined load, it must also consider requiring the manufacturer

Track allows maximum vertical deviation of the force generated.

3.1.5 permanently installed (fixed) crane, the specific use of the site or regional seismic effect in Table 1 should I, II, III working conditions

Next to be considered separately as an additional load.

3.1.6 When calculated according to Table 1, it should consider the weight of the load caused by the crane and its components, including the crane in working condition testimony

All the weight load of the spreader caused permanent member.

3.2 after anti-tipping stability under working conditions

3.2.1 verification requirements

When the crane is in the unloaded state, all the movable member is retracted into the work closest to the line after tipping position, after the anti-working state

It should be required to rollover Stability 3.2.2 or 3.2.3 (also in accordance with Table 1 condition IV) for verification.

3.2.2 Moment Method

Work by the wind load W1 and inertial forces generated by tipping moment D should not exceed 90% of the steady torque.