1 General Provisions
1.0.1 This code is formulated with a view to strengthening the management of shield tunnelling construction, unifying the construction technology and quality acceptance criteria of shield tunnelling and ensuring the project safety, environmental safety and project quality during construction process.
1.0.2 This code is applicable to the construction and acceptance of tunnelling of prefabricated segment assembly which is constructed with shield tunnelling method.
1.0.3 The construction and acceptance of shield tunnelling shall not only meet the requirements stipulated in this code, but also comply with those in the current relevant national standard.
2 Terms
2.0.1 shield
the whole-section push-type mechanical equipment for tunnel construction, which is composed of host and back-up equipment and completes operations such as tunnelling, residue discharging and segment assembly under the steel shell protection. It is classified into earth pressure balanced shield, slurry balanced shield, open shield and air pressure balanced shield according to the stabilization method of excavated surface
2.0.2 working shaft
the shaft used for shield assembly, disassembly, u-turn, empty-push, segment lifting and muck conveying, etc., including shield launching working shaft, shield arrival working shaft, inspection working shaft, etc.
2.0.3 shield launching
the construction process of shield tunnelling
2.0.4 shield arrival
the construction process of shield reaching the arrival position
2.0.5 shield cradle
the support device used for maintaining such positions and stances as shield launching and arrival
2.0.6 reaction frame
the support device providing reaction for shield launching and tunnelling
2.0.7 segment
the basic unit of prefabricated lining ring of tunnel; segment types include reinforced concrete segment, fiber concrete segment, steel segment, cast iron segment, composite segment, etc.
2.0.8 temporary segment
temporary segment transferring pushing force for the shield launching and tunnelling
2.0.9 mould loosening
the process of opening the top or side template of reinforced concrete segment mould
Foreword i
1 General Provisions
2 Terms
3 Basic Requirements
4 Construction Preparation
4.1 Preliminary Investigation
4.2 Technical Preparation
4.3 Selection and Configuration of Shield
4.4 Facilities Preparation
4.5 Working Shaft
5 Construction Survey
5.1 General Requirements
5.2 Ground Control Survey
5.3 Connection Survey
5.4 Control Survey in Tunnel
5.5 Tunnelling Construction Survey
5.6 Breakthrough Survey
5.7 As-built Survey
6 Segment Production and Acceptance
6.1 General Requirements
6.2 Raw Material
6.3 Mould of Reinforced Concrete Segment
6.4 Steel Skeleton
6.5 Concrete
6.6 Reinforced Concrete Segment
6.7 Steel Segment
6.8 Storage and Carriage of Segment
6.9 Acceptance for Segment
7 Tunnelling Construction
7.1 General Requirements
7.2 Shield Assembly and Debugging
7.3 Shield Site Acceptance
7.4 Shield Launching
7.5 Earth Pressure-balanced Shield Construction
7.6 Slurry Shield Construction
7.7 Shield Position and Stance Control
7.8 Work in Chamber
7.9 Shield Arrival
7.10 U-turn, Station-crossing and Empty-push
7.11 Shield Disassembly
8 Construction of Special Section
8.1 General Requirements
8.2 Construction Measures
9 Segment Assembly
9.1 General Requirements
9.2 Assembly
9.3 Assembly Quality Control
9.4 Repairing
10 Back-fill Grouting
10.1 General Requirements
10.2 Grouting Materials and Parameters
10.3 Grouting
11 Tunnel Waterproofing
11.1 General Requirements
11.2 Joint Waterproofing
11.3 Special-site Waterproofing
12 Construction Safety and Environmental Protection
13 Shield Maintenance and Service
14 Construction Transport
14.1 General Requirements
14.2 Horizontal Transport
14.3 Vertical Transport
14.4 Pipeline Transport
15 Construction Monitoring
15.1 General Requirements
15.2 Around Tunnel Monitoring
15.3 Tunnel Structure Monitoring
15.4 Frequency of Monitoring
15.5 Control Value and Early Warning of Monitoring
15.6 Monitoring Results and Feedback
16 Tunnel Acceptance
Explanation of Wording in This Code
List of Quoted Standards
1 General Provisions
1.0.1 This code is formulated with a view to strengthening the management of shield tunnelling construction, unifying the construction technology and quality acceptance criteria of shield tunnelling and ensuring the project safety, environmental safety and project quality during construction process.
1.0.2 This code is applicable to the construction and acceptance of tunnelling of prefabricated segment assembly which is constructed with shield tunnelling method.
1.0.3 The construction and acceptance of shield tunnelling shall not only meet the requirements stipulated in this code, but also comply with those in the current relevant national standard.
2 Terms
2.0.1 shield
the whole-section push-type mechanical equipment for tunnel construction, which is composed of host and back-up equipment and completes operations such as tunnelling, residue discharging and segment assembly under the steel shell protection. It is classified into earth pressure balanced shield, slurry balanced shield, open shield and air pressure balanced shield according to the stabilization method of excavated surface
2.0.2 working shaft
the shaft used for shield assembly, disassembly, u-turn, empty-push, segment lifting and muck conveying, etc., including shield launching working shaft, shield arrival working shaft, inspection working shaft, etc.
2.0.3 shield launching
the construction process of shield tunnelling
2.0.4 shield arrival
the construction process of shield reaching the arrival position
2.0.5 shield cradle
the support device used for maintaining such positions and stances as shield launching and arrival
2.0.6 reaction frame
the support device providing reaction for shield launching and tunnelling
2.0.7 segment
the basic unit of prefabricated lining ring of tunnel; segment types include reinforced concrete segment, fiber concrete segment, steel segment, cast iron segment, composite segment, etc.
2.0.8 temporary segment
temporary segment transferring pushing force for the shield launching and tunnelling
2.0.9 mould loosening
the process of opening the top or side template of reinforced concrete segment mould
Contents of GB 50446-2017
Foreword i
1 General Provisions
2 Terms
3 Basic Requirements
4 Construction Preparation
4.1 Preliminary Investigation
4.2 Technical Preparation
4.3 Selection and Configuration of Shield
4.4 Facilities Preparation
4.5 Working Shaft
5 Construction Survey
5.1 General Requirements
5.2 Ground Control Survey
5.3 Connection Survey
5.4 Control Survey in Tunnel
5.5 Tunnelling Construction Survey
5.6 Breakthrough Survey
5.7 As-built Survey
6 Segment Production and Acceptance
6.1 General Requirements
6.2 Raw Material
6.3 Mould of Reinforced Concrete Segment
6.4 Steel Skeleton
6.5 Concrete
6.6 Reinforced Concrete Segment
6.7 Steel Segment
6.8 Storage and Carriage of Segment
6.9 Acceptance for Segment
7 Tunnelling Construction
7.1 General Requirements
7.2 Shield Assembly and Debugging
7.3 Shield Site Acceptance
7.4 Shield Launching
7.5 Earth Pressure-balanced Shield Construction
7.6 Slurry Shield Construction
7.7 Shield Position and Stance Control
7.8 Work in Chamber
7.9 Shield Arrival
7.10 U-turn, Station-crossing and Empty-push
7.11 Shield Disassembly
8 Construction of Special Section
8.1 General Requirements
8.2 Construction Measures
9 Segment Assembly
9.1 General Requirements
9.2 Assembly
9.3 Assembly Quality Control
9.4 Repairing
10 Back-fill Grouting
10.1 General Requirements
10.2 Grouting Materials and Parameters
10.3 Grouting
11 Tunnel Waterproofing
11.1 General Requirements
11.2 Joint Waterproofing
11.3 Special-site Waterproofing
12 Construction Safety and Environmental Protection
13 Shield Maintenance and Service
14 Construction Transport
14.1 General Requirements
14.2 Horizontal Transport
14.3 Vertical Transport
14.4 Pipeline Transport
15 Construction Monitoring
15.1 General Requirements
15.2 Around Tunnel Monitoring
15.3 Tunnel Structure Monitoring
15.4 Frequency of Monitoring
15.5 Control Value and Early Warning of Monitoring
15.6 Monitoring Results and Feedback
16 Tunnel Acceptance
Explanation of Wording in This Code
List of Quoted Standards
