标准编号:	JGT/T 3371-01-2022
中文名称:	公路沉管隧道设计规范
英文名称:	Specifications for Design of Highway Immersed Tunnel
行业分类:	JG    建筑工业行业标准
发布机构:	中华人民共和国交通运输部
发布日期:	2022-11-01
实施日期:	2022-6-28
标准状态:	现行
翻译语言:	英文
文件格式:	PDF
中文字符数:	100000 字
翻译价格(元):	8000.00 元
交付时间:	付款后 1~5 个工作日

1 General

1.0.1 This specification has been developed to standardise and guide the design of immersed tunnels for highways.

1.0.2 This specification applies to new road underwater tunnels constructed by the immersed tube method.

1.0.3 The design of immersed tube tunnels shall follow the basic principles of safety, applicability, durability, economy and greenness.

Article description

Immersed tube tunnels should ensure structural and operational safety during construction and use, meet the basic functions of the road, provide a relatively comfortable driving environment, ensure durability during the design life, save construction costs during construction and maintenance costs during use, and contribute to ecological and environmental protection and energy conservation to achieve optimum life-cycle performance.

1.0.4 The design of immersed tube tunnels should be integrated with the superstructure, traffic engineering and ancillary facilities.

Notes

The design of immersed tube tunnels is based on a wide range of disciplines. In the case of civil engineering, consideration should be given to the structure of the immersed tube section and the tunnel structure of the articulated section, the foundation, foundations and backfilling, the road surface and drainage system, the tube section α installation facilities, the ancillary structures, etc.; in the case of traffic engineering and ancillary facilities, consideration should be given to traffic safety, ventilation, lighting, water supply and fire fighting, power supply and distribution, etc. It is necessary to comprehensively consider the mutual influence between the various professions and deal with the relationship between the systems in an integrated manner.

1.0.5 The design of immersed tube tunnels should implement the relevant national technical and economic policies and adopt new technologies, materials, equipment and techniques in a positive and prudent manner.

1.0.6 In addition to the provisions of this Code, the design of immersed tube tunnels shall conform to the provisions of the relevant national and industry standards in force.

2 Terminology and symbols

2.1 Terminology

3 Basic provisions

3.0.1 Immersed tube tunnel structures and facilities shall be capable of withstanding the various actions specified during construction and use and shall meet the specified service and durability requirements.

3.0.2 The design service life of immersed tube tunnel structures shall not be less than that specified in Table 3.0.2.

4 Surveys & Surveying

4.1 General provisions

4.1.1 Immersed tube tunnels shall reflect the construction conditions of the project area in a comprehensive manner, using surveys and surveys in accordance with the tasks, aims and requirements of the different phases of the work and taking into account the characteristics of the project.

Article description

The feasibility study phase, with the aim of understanding the full scope of the project, is based on the collection and analysis of existing information, site surveys, supplemented by the necessary site mapping, and the need to give reliable conclusions on the constraining factors and to provide basic information for the selection of the project site, route and programme selection. During the preliminary design stage, a preliminary survey was carried out along the alignment of the tunnel and the necessary mapping and survey work was carried out to identify the controlling conditions for the tunnel design and to provide basic information for the design of the immersed tube tunnel. During the construction design phase, a comprehensive survey method based on drilling verification and testing is used to provide detailed and highly accurate basic information for the construction design. All phases need to be interlinked and the results of the first phase are fully utilised in the second phase.

4.1.2 The main contents of the survey and investigation and the means used are in accordance with the provisions of Table 4.1.2.

5 Materials

5.0.1 Engineering materials for immersed tube tunnels shall be selected according to the type of structure, force conditions, construction techniques, use requirements and the environment in which they are located, and shall meet reliability and economy requirements.

5.0.2 The concrete shall comply with the following provisions:

l The choice of raw materials and the proportion of concrete, strength grade, frost resistance, impermeability grade shall meet the requirements of durability design and waterproof design.

2 The strength grade of concrete for the main structure shall comply with the provisions of Table 5.0.2.

6 Overall design

6.1 - General provisions

6.1.1 The overall design shall include the tunnel location, horizontal and vertical alignment, cross-sectional layout, immersed tube section layout, disaster prevention and rescue, construction planning, etc.

6.1.2 The overall design shall be based on the following principles;

1 conform to the road network, waterway, shoreline and other planning in the area affected by the project 2 meet the prefabrication of pipe sections and floating installation and other process requirements.

3 meet the operational function requirements of safe and comfortable traffic, convenient and economic operation and maintenance, and efficient disaster prevention and rescue.

6.2 Tunnel location

6.2.1 The location of the immersed tube tunnel should be chosen in a stable river, with a gentle river bed. Hydrological conditions window period should meet the requirements of the pipe section floating, immersed in the construction operations.

6.2.2 The location of the immersed tube tunnel should avoid crossing areas with extremely complex geological or environmental conditions, as well as environmentally sensitive buildings (structures); if this cannot be avoided, special demonstration should be carried out and effective countermeasures taken.

7 Pipe section structure

7.1 General provisions

7.1.1 The structural design of pipe joints shall not only meet the functional and structural safety and durability requirements, but also meet the construction and operational maintenance requirements.

7.1.2 The structural design of pipe joints shall include the cross-sectional dimensions of the pipe joints, the type of structure and longitudinal structure, the type of joints, the load-bearing capacity and structural requirements of the main structure and joints, waterproofing measures, etc.

Article description

The structural design of pipe joints is a dynamic and iterative process (Figure 7-1). In the specific design process, the pipe joint structure design process needs to be adjusted or simplified according to the actual situation.

8 Trench, foundation and base, backfill

8.1 General provisions

8.1.1 The design of the foundation trench shall be based on the geological and hydrological conditions of the area where the immersed tube tunnel is located, taking into account the requirements for the level and longitudinal plane of the tunnel, the cross-section of the tube section, the floating and installation of the tube section, the technology and equipment for the construction of the foundation, etc.

8.1.2 The foundations and foundations should meet the requirements for bearing capacity o deformation and stability during the construction and use phases.

8.1.3 The backfill shall meet the requirements for floatation, lateral movement and protection of the pipe section structure and shall be resistant to scouring.

Article description

In addition to meeting the requirements of the pipe section for anti-floating and anti-lateral slip, the backfill shall also have the function of protecting the pipe section under accidental conditions such as anchoring, anchor towing, ship striking, etc. At the same time, the backfill and its composition shall have the ability to resist scouring under the action of water currents, etc.

9 Articulation section

9.0.1 The design of the articulated section shall be based on the tunnel structure and construction techniques, the docking requirements of the pipe section, and the design of the articulated section in conjunction with the shore protection works to meet the functional, force, impermeability and flood protection requirements.

Article description

The tunnel structure of the articulated section is generally constructed in-situ in the shore pit, with temporary measures and structures such as cover cofferdams and pit supports, taking into account the requirements related to the docking of adjacent pipe sections, such as the removal of partial shoring before docking and restoration after docking, and sufficient axial thrust resistance of the concealed section.

9.0.2 The comprehensive design of the tunnel structure and the adjacent pipe section shall be carried out in an integrated manner, taking into account the foundation, overlying loads, etc.

10 Analytical calculations

10.1 General provisions

10.1.1 The structure and foundations of immersed tube tunnels shall be subjected to endurance, transient, accidental and seismic limit state calculations to meet strength, stiffness and stability requirements.

11 Design for durability

11.0.1 The durability design of immersed tube tunnel structures shall be based on the design life of the structural elements, the type of environment in which they are located and the level of action, and shall determine the material durability indicators, structural measures to mitigate the effects of the environment, and additional measures to prevent corrosion.

12 Pipe joints and sprite installation facilities

12.0.1 The design of the end walls, ballast water devices, bollards, lifting points, measuring towers, guides, pulling devices, manholes, etc. shall be carried out in accordance with the principles of safety, reliability, ease of dismantling, economy and reasonableness.

13 Pavement and drainage system

13.1 Pavement

13.1.1 The pavement of the immersed tube tunnel shall be designed taking into account the structural conditions of the project, traffic loading, environmental climate, construction conditions and maintenance convenience, to meet the performance requirements of leveling, durability, anti-slip, wear resistance and environmental protection.

13.1.2 The pavement of the immersed tube tunnel should be a composite pavement structure with two layers of asphalt pavement, with a total thickness of 80-100mm, and should be provided with a waterproof bonding layer.

14 Accessory structures

14.1 General provisions

14.1.1 Accessory structures shall be planned and coordinated with the main structure, traffic engineering and ancillary facilities to facilitate construction and maintenance at a later stage.

14.1.2 Gutters and cable ditches, decorative layers, cavity light reduction structures shall be set up according to their function and shall comply with the current Code of Practice for the Design of Road Underwater Tunnels (JTG/T3371).

14.2 Escape routes

14.2.1 Escape routes shall comply with the following provisions:1 Escape routes shall be set up in the service corridor.

2 escape opening spacing should be comprehensive examination of the total tunnel length, the length of the pipe section, traffic volume and composition, ventilation facilities, fire-fighting facilities and other factors to determine, appropriate for 100 two 150m,

3 The net width of the escape route and escape white should not be less than 1.2m and the net height should not be less than 2.1m.

15 Traffic engineering and ancillary facilities

15.1 - General provisions

15.1.1 Traffic engineering and ancillary facilities shall be coordinated with the main structure of the immersed tube tunnel and the connection works at both ends of the tunnel, with comprehensive traffic safety facilities, ventilation facilities, lighting facilities, water supply and fire fighting facilities, power supply and distribution facilities, central control management system and monitoring facilities.

16 Structural monitoring

16.0.1 Structural monitoring of the immersed tube tunnel shall be carried out in two phases, during the construction and operation periods.

17 Risk Analysis

17.0.1 Risk analysis shall be carried out during the design phase of the immersed tube tunnel to optimise risk control measures and to achieve effective dynamic control of risk.

Appendix A Calculation of double steel plate - concrete combination structures

Explanation of terms used in this specification

1 General
2 Terminology and symbols
3 Basic provisions
4 Surveys & Surveying
5 Materials
6 Overall design
7 Pipe section structure
8 Trench, foundation and base, backfill
9 Articulation section
10 Analytical calculations
11 Design for durability
12 Pipe joints and sprite installation facilities
13 Pavement and drainage system
14 Accessory structures
15 Traffic engineering and ancillary facilities
16 Structural monitoring
17 Risk Analysis
Appendix A Calculation of double steel plate - concrete combination structures
Explanation of terms used in this specification

1总则
1.0.1为规范和指导公路沉管隧道设计，制定本规范。
1.0.2本规范适用于以沉管法施工的新建公路水下隧道。
1.0.3沉管隧道设计应遵循安全、适用、耐久、经济、绿色的基本原则。
条文说明
沉管隧道需保证施工和使用期间的结构安全与运营安全，满足公路基本功能，提供相对舒适的行车环境，保障在设计使用年限内的耐久性，节省施工期建设成本和使用期养护费用，利于生态环保与节能降耗实现全寿命周期成参最优。
1.0.4沉管隧道应统筹开展上建工程、交通工程与附属设施的综合设计。
条文说明
沉管隧道设计陟及专业较多。在土德工程方面，需要考虑沉管段与衔接段隧道结构、基槽、地基与基础/回填、路面与排水系统、管节牺装设施、附属构造等;在交通工程与附属设施方面，需要考虑交通安全、通风、照明、消防给水和灭火、供配电等设施。要综合考虑各专业之间的相互影响，统筹处理各系统之间的关系。
1.0.5沉管隧道设计应贯彻国家有关技术经济政策，积极稳妥地采用新技术、新材料、新设备与新工艺。
1.0.6沉管隧道设计除应符合本规范的规定外，尚应符合国家和行业现行有关标准的规定。
2术语和符号
2.1术语
3基本规定
3.0.1沉管隧道结构和设施应能承受在施工和使用期间规定的各种作用，满足规定的使用要求和耐久性要求。
3.0.2沉管隧道结构的设计使用年限不应低于表3.0.2_的规定。
4调查与勘测
4.1一般规定
4.1.1沉管隧道应根据不同工作阶段的任务、目的与要求，结合项目特点，采用调查及勘测等手段，全面反映工程区域的建设条件。
条文说明
可行性研究阶段，以了解项目大范围全貌为目的,以搜集分析既有资料、现场踏勘为主，并辅以必要的现场测绘，需要对制约性因素给出可靠的结论，为项目选址、路线及方案比选提供基础资料。初步设计阶段，精隧道沿线进行初步调查并开展必要的测绘与勘察工作，查明隧道设计的控制性条供、为沉管隧道设计提供基本资料。施工图设计阶段，采用以钻探验证与测试为主的综合勘测方法、为施工图设计提供详尽的、高精度的基础资料。各阶段需相互衔接前阶段的成果在后阶段得到充分利用。
4.1.2调查与勘测的主要内容及采用手段食符合表4.1.2的规定。
5材料
5.0.1沉管隧道的工程材料应根据结构类型、受力条件、施工工艺、使用要求和所处环境等因素选用，并应满足可靠性和经济性要求。
5.0.2混凝土应符合下列规定:
l混凝土的原材料选用及配合比、强度等级、抗冻性能、抗渗等级应满足耐久性设计与防水设计要求。
2主体结构用混凝土强度等级应符合表5.0.2的规定。
6总体设计
6.1—般规定
6.1.1总体设计应包括隧道位置、平纵线形、横断面布置、沉管段布置、防灾救援、施工筹划等内容。
6.1.2总体设计应遵循下列原则;
1符合工程影响区域内的路网、航道、岸线等规划2满足管节预制及浮运安装等工艺要求。
3满足行车安全舒适、运维便捷经济、防灾救援高效的运营功能要求。
6.2隧道位置
6.2.1沉管隧道位置官选在河势稳定、河美海）床平缓等地段。水文条件窗口期应满足管节浮运、沉放施工作业的要求。
6.2.2沉管隧道位置应避免穿越地质或环境条件极为复杂的区域，以及对环境敏感的建（构）筑物;不能避免时，应进行专项论证并采取有效应对措施。
7管节结构
7.1一般规定
7.1.1管节结构设计除应满足使用功能、结构安全耐久要求外,尚应满足施工及运营养护等要求。
7.1.2管节结构设计应包含管节横截面尺寸、结构类型及纵向结构形式、接头类型、主体结构与接头的承载能力及构造要求、防水措施等内容
条文说明
管节结构设计的内容和需考虑的因素较多，是一个反复动态调整的过程（图7-1)。在具体设计过程中，需根据实际情况对管节结构设许流程进行适当调整或简化。
8基槽、地基与基础、回填
8.1一般规定
8.1.1应根据沉管隧道所在区域的地质及水文条件，综合考虑隧道平纵面、管节横断面、管节浮运与安装、基础施工的工艺及设备等要求进行基槽设计。
8.1.2地基与基础应满足施工和使用阶段的承载力o变形及稳定性要求。
8.1.3回填应满足管节抗浮、抗侧移及防护管节结构的要求，且具备抗冲刷能力。
条文说明
回填除满足管节的抗浮与抗侧向滑移要求外，还雾在抛锚、拖锚、船撞等偶然状况下具有保护管节的功能，同时，回填料及其组成需具备在水流等作用下的抗冲刷能力。
9衔接段
9.0.1应根据隧道结构及施工工艺、管节对接需求，结合护岸工程进行衔接段设计，满足功能、受力、防渗、防洪等要求。
条文说明
衔接段隧道结构一般采用岸上基坑内现浇施工，需设罩围堰、基坑支护等临时措施与构造，考虑与相邻管节对接的相关要求，如对接前拆除局部护岸、对接后再恢复，暗埋段具备足够的轴向止推性能等。
9.0.2﹑应考虑地基基础、上覆荷载等因素，统筹开展衔接段隧道结构与相邻管节的综合设计。
10分析计算
10.1一般规定
10.1.1沉管隧道的结构、基础应进行持久状况、短暂状况、偶然状况和地震状况下极限状态验算，满足强度、刚度、稳定性要求。
11耐久性设计
11.0.1沉管隧道结构的耐久性设计应根据结构构件的设计使用年限、所处的环境类别及作用等级，确定材料耐久性指标、减轻环境作用效应的结构构造措施、防腐蚀附加措施。
12管节魉装设施
12.0.1﹑管节魉装设施应遵循安全可靠、便于拆装、经济合理的原则，开展端封墙、压载水装置、系缆柱、吊点、测量塔、导向装置、拉合装置、人孔等设计。
13路面与排水系统
13.1路面
13.1.1沉管隧道的路面应综合考虑工程结构条件、交通荷载、环境气候、施工条件及维养便捷性等因素进行设计，满足平整、耐久、抗滑、耐磨、环保等性能要求。
13.1.2沉管隧道的路面宜采用复合式路面结构y沥青路面结构层宜取两层，总厚度宜取80~100mm，应设防水黏结层。
14附属构造
14.1一般规定
14.1.1附属构造应与主体结构、交通工程及附属设施统筹规划和相互协调，方便施工及后期养护。
14.1.2水沟与电缆沟、装饰层、洞口减光构造物应根据使用功能设置，并应符合现行《公路水下隧道设计规范》(JTG/T3371）的规定
14.2逃生通道
14.2.1逃生通道应符合下列规定:1逃生通道宜设置在服务管廊内。
2逃生口间距应综合考总隧道长度、管节长度、交通量及组成、通风设施、灭火设施等因素确定，宜为100二150m,
3逃生通道及逃生白的净宽不应小于1.2m，净高不应小于2.1m。
15交通工程与附属设施
15.1—般规定
15.1.1交通工程与附属设施应与沉管隧道的主体结构、隧道两端的接线工程相协调，设置完善的交通安全设施、通风设施、照明设施、消防给水和灭火设施、供配电设施、中央控制管理系统及监控设施。
16结构监测
16.0.1沉管隧道结构监测应按施工期和运营期两阶段开展工作。
17风险分析
17.0.1沉管隧道在设计阶段应开展风险分析，优化风险控制措施，实现风险的有效动态管控。
附录A双层钢板-混凝土组合结构的计算
本规范用词用语说明