GB/T 41056-2021
Full face tunnel boring machine—Double shield hard rock tunnel boring machine (English Version)
- Standard No.
- GB/T 41056-2021
- Language
- Chinese, Available in English version
- Release Date
- 2021
- Published By
- General Administration of Quality Supervision, Inspection and Quarantine of the People‘s Republic of China
- Latest
- GB/T 41056-2021
- Scope
- This document specifies the basic parameters and models, technical requirements, test methods, inspection rules, accompanying documents, signs, packaging and transportation of double-shield rock tunnel boring machines in full-face tunnel boring machines. This document applies to the design, manufacture and use of double-shield rock tunnel boring machines (hereinafter referred to as tunnel boring machines) among full-face tunnel boring machines.
- Introduction
Analysis of the core content of the standard
GB/T41056-2021 is my country's first special standard for double-shield rock tunnel boring machines. It systematically standardizes the technical requirements for the entire chain of equipment design, manufacturing and engineering application for the first time. The standard innovatively establishes a double shield TBM performance evaluation system, and its technological evolution is mainly reflected in:
- Introduction of mandatory requirements for back-mounted cutters on the cutter head (diameter ≥4.5m)
- Additional accuracy indicators for roll adjustment devices
- Specify that the design life of the main bearing is ≥15,000 hours
Comparison of key technical parameters
Parameter category Single shield TBM Double shield TBM Difference analysis Working mode Sequential operation Synchronous operation Efficiency increased by more than 30% Propulsion system Single-stage hydraulic cylinder Main/auxiliary dual system More precise thrust distribution Step change time ≤8min ≤5min Optimized mechanism design
Key technologies of mechanical system
Cutter system
Standard requirements: The flatness of the cutter disc panel must reach GB/T37400.3-E level, and the tool installation radius deviation must be controlled within ±2mm. The theoretical torque is calculated using the rolling resistance coefficient method:
T=∑(f×Fi×Ri)+∑Tm (see Appendix A for details)
Propulsion system
Dual-mode thrust calculation model:
- Main propulsion mode: FZT=K1×(F3+F5)
- Auxiliary propulsion mode: FFT=K1×(F1+F2+F3+F4)
The grounding pressure of the support shoe must be ≤4MPa (5.2.6.2)
Electrical and safety control
Innovative provisions of the standard:
- The high and low voltage systems must be equipped with five-protection interlocking devices (5.4.1.5)
- The angular measurement accuracy of the total station of the guidance system is ≥2″ (5.5.1)
- The emergency stop switch requires a two-stage reset (5.4.7.1)
Implementation suggestions
Design phase
- Give priority to using variable frequency drive main motor (5.2.2.9)
- The outer diameter of the shield adopts a gradient design with larger front and smaller back (5.2.3.7)
Construction phase
- Strictly monitor the oil contamination degree (≤GB/T14039-2002-/18/15)
- Regularly check the guide system base point (5.5.6)
GB/T 41056-2021 Referenced Document
- GB 2893 Safety colours
- GB 2894 Safety signs and guideline for the use
- GB 5226.3 Sefety of machinery.Eletrical equipment of machines.Part 11:Requirements for HV equipment for voltages above 1000Va.c.or 1500Vd.c.and not exceeding 36kV
- GB/T 191 Packaging.Pictorial marking for handling of goods
- GB/T 1985-2014 High-voltage alternating-current disconnectors and earthing switches
- GB/T 3766 Hydraulic fluid power.General rules and safety requirements for systems and their components
- GB/T 3956 Conductors of insulated cables
- GB/T 4208 Enclosure protection level (IP code) "Amendment No. 1" GB/T 4208-2017
- GB/T 5226.1 Electrical safety of machinery—Electrical equipment of machines—Part 1:General requirements
GB/T 41056-2021 history
- 2021 GB/T 41056-2021 Full face tunnel boring machine—Double shield hard rock tunnel boring machine