Standard No.:	GB 50446-2008
English Name:	Code for construction and acceptance of shield tunnelling method
Chinese Name:	盾构法隧道施工与验收规范
Chinese Classification:	P21    Earthwork and tunneling works
Professional Classification:	GB    National Standard
Issued by:	MOC
Issued on:	2008-3-31
Implemented on:	2008-9-1
Status:	superseded
Superseded by:	GB 50446-2017 Code for construction and acceptance of shield tunnelling method
Superseded on:	2017-7-1
Abolished on:	2017-07-01
Language:	English
File Format:	PDF
Word Count:	16000 words
Price(USD):	400.0
Delivery:	via email in 1 business day

1.0.1 This code is formulated in order to strengthen tunnelling works construction management with shield tunnelling method, unify construction technique and quality acceptance standard of shield tunnelling works and ensure works safety, environment safety and works quality of construction process. 1.0.2 This code is applicable to the construction and quality acceptance of prefabricated segment assembly tunnelling structure with shield tunnelling method construction. 1.0.3 The shield indicated in this code shall include soil-pressure balance shield, muddy water shield and compound shield. 1.0.4 The requirements for construction and quality in contract and technical documents of shield tunnelling method tunnelling works shall not be less than those specified in this code. 1.0.5 During construction period of shield tunnelling method tunnelling works, the adjacent building (structure) and underground pipe network shall be monitored; the important building (structure) or with special protection requirements shall be adopted with necessary technical measures as required. 1.0.6 The construction and acceptance for the shield tunnelling method tunnelling works shall not only comply with this code but also comply with those in the national current relevant standards.

1 General Provisions 2 Terms 3 Basic Requirements 4 Construction Preparation 4.1 General Provisions 4.2 Primary Stage Investigation 4.3 Technical Preparation 4.4 Preparation of Equipment and Facilities 4.5 Working Shaft 5 Construction Survey 5.1 General Requirements 5.2 Ground Control Survey 5.3 Connection Survey 5.4 Underground Control Survey 5.5 Tunnelling Construction Survey 5.6 Penetration Survey 5.7 Final Survey 6 Segment Manufacture 6.1 General Requirements 6.2 Preparation Work 6.3 Requirements of Raw Materials 6.4 Reinforced Concrete Segment Mould 6.5 Reinforcement 6.6 Concrete 6.7 Reinforced Concrete Segment 6.8 Storage and Transport of Reinforced Concrete Segment 6.9 Steel Segment 7 Shield Tunnelling Construction 7.1 General Requirements 7.2 Assembly and Debugging of Shield 7.3 Field Acceptance of Shield 7.4 Shield Launching 7.5 Soil Pressure Balance Shield Tunnelling 7.6 Muddy Water Balance Shield Tunnelling 7.7 Compound Shield Tunnelling 7.8 Position and Stance Control of Shield 7.9 Tool Replacement 7.10 Shield Arrival 7.11 Turn Back and Station-crossing of Shield 7.12 Shield Colony 8 Construction of Special Section 8.1 General Requirements 8.2 Construction Measures of Special Section 9 Segment Assembly 9.1 General Requirements 9.2 Preparation before Assembly 9.3 Assembly Operation 9.4 Quality Control of Segment Assembly 9.5 Segment Repair 10 Back-fillgrouting 10.1 General Requirements 10.2 Selection of Grouting Parameters 10.3 Preparation before Grouting 10.4 Grouting Operation 11 Waterproof Protection of Tunnel 11.1 General Requirements 11.2 Waterproof Protection of Joint 11.3 Waterproof Protection of Special Position 12 Construction safety, Sanitation and Environmental Protection 13 Curing and Maintenance of Shield 14 Tunnel Construction Transport 14.1 General Requirements 14.2 Horizontal Transport 14.3 Vertical Lifting 14.4 Pipeline Transport 15 Monitoring Measurement 15.1 General Requirements 15.2 Monitoring Measurement of Tunnel Environment 15.3 Monitoring Measurement of Tunnel Structure 15.4 Data Processing and Information Feedback 16 Acceptance of Reinforced Concrete Segment 17 Acceptance of Formed Tunnel Explanation of Wording in this Code