GB 50385-2018 (English Version)

Standard No.: GB 50385-2018
Language: Chinese, Available in English version
Release Date: 2018
Published By: Ministry of Housing and Urban-Rural Development of the People's Replublic of China
Latest: GB 50385-2018
Replace: GB 50385-2006

Scope: The "Mine Derrick Design Standard" is now approved as a national standard, numbered GB50385-2018, and will be implemented from September 1, 2018. Among them, Articles 1.0.4, 1.0.5, 4.2.1, 4.2.2, 4.2.4, 5.1.7, and 5.3.2 are mandatory provisions and must be strictly implemented. The original national standard "Code for Mine Derrick Design" GB50385-2006 will be abolished at the same time. This standard is published on the website of the Ministry of Housing and Urban-Rural Development (www.mohurd.gov.cn), and is published by the China Planning Publishing House organized by the Institute of Standards and Quotas of the Ministry of Housing and Urban-Rural Development. Ministry of Housing and Urban-Rural Development of the People's Republic of China January 16, 2018

Introduction

1. Background of Standard Formulation and Analysis of Technology Evolution

This standard was revised by the China Coal Construction Association at the request of the Ministry of Housing and Urban-Rural Development. Through a comprehensive update of the original national standard, new content of seismic design was introduced, and the self-weight estimation formula of the steel derrick structure was optimized. This revision widely solicited opinions from industry experts and drew on advanced foreign experience.

2. Comparative analysis of standard frameworks

Chapter content	Original standard	New standard
General principles	No clear seismic requirements	New seismic fortification categories and requirements
Terms and symbols	Basically covers the main terms	New terms such as earthquake action and load combination
Load calculation	Rope breaking load is not included	Increase the standard value of broken rope and anti-fall braking load

3. Implementation suggestions and professional interpretation

Case analysis: The importance of broken rope load calculation

In the new standard, the calculation method of broken rope load is clearly required. When single rope lifting, one should be the broken rope load and the other should be twice the working load; when multi-rope lifting, one side should be the broken rope load of all wire ropes and the other side should be 0.33 times the broken rope load. This regulation can effectively ensure the safety of the derrick under extreme conditions.

4. Professional terms and practical applications

Anti-overturning moment: refers to the ability of the structure to resist overturning, which usually needs to meet the requirement of Me/Mo ≥1.3.
Representative value of gravity load: Standard value of load used to verify deformation and crack width under normal use limit state.

5. Structural design and material requirements

Main force-bearing components of steel derricks should not be made of materials with yield strength lower than 235MPa. The steel plate thickness of key parts such as the sheave support structure and supporting beams should not be less than 8mm, and the node plate thickness should not be less than 6mm.

GB 50385-2018 Referenced Document

GB 191 Packaging--Pictorial marking for handling of goods
GB 50009 Load code for the design of building structures
GB 50057 Code for design protection of structures against lightning

GB 50385-2018 history

2018 GB 50385-2018 Mine derrick design standard
2006 GB 50385-2006 Code for design of the mine headframes