GB 55011-2021Technical code for engineering of prestressed concrete pavement (English PDF)

7.1 General provisions

7.1.1 The construction plan of the tunnel shall be determined based on comprehensive factors such as topography, geology, hydrology, meteorology, earthquake conditions, traffic volume and its composition, construction, operation and maintenance on the basis of survey and survey data, and shall be consistent with ground and underground construction. (Structure) buildings and various pipelines should be well coordinated.

7.1.2 The general layout and configuration of equipment and facilities of the tunnel shall meet the requirements of daily operation, management and disaster prevention and rescue.

7.1.3 The horizontal and vertical alignment of the tunnel shall be determined according to factors such as topography, engineering geology, hydrogeology, route direction, opening position, obstacles along the route, construction method and other factors, and shall meet the safety requirements of vehicles.

7.1.4 The distance between the tunnel exit and the road intersection on the ground shall meet the requirements for safe passage of vehicles.

7.1.5 The cross-section of the tunnel shall be determined according to the requirements of line technical standards, building limits, equipment layout, structural design, construction method, disaster prevention and operation and maintenance.

7.1.6 Inflammable, explosive and dangerous goods pipelines should not be laid in the tunnel.

7.1.7 The tunnel disaster prevention design shall include traffic safety facilities, traffic monitoring, disaster alarm, ventilation and smoke exhaust, safe evacuation and rescue, disaster prevention power supply and emergency lighting, fire water supply and fire extinguishing, flood prevention, emergency communication and main structure protection measures wait.

7.1.8 Fire protection in tunnels should be set up according to the fact that one fire occurs in one tunnel at the same time.

7.1.9 The tunnel shall determine the fire prevention plan and emergency rescue strategy based on comprehensive factors such as traffic volume, traffic characteristics, fire scale, natural environmental conditions, length of closed section and alignment.

7.1.10 Hazardous chemical vehicles should pass through the tunnel under supervision and protection.

7.2 Main structure

7.2.1 The main structure of the tunnel should be based on the characteristics of the project and the construction conditions along the line, and through a comprehensive evaluation of technology, economy, construction period, and environmental impact, a safe, reliable, economical and reasonable structural form and implementation plan should be selected.

7.2.2 The design service life of the main structure of the tunnel shall be 100 years, and the durability design shall be carried out according to the environmental conditions.

7.2.3 The tunnel structure shall meet the feasibility and operational safety requirements of project implementation.

7.2.4 The structural design of the tunnel shall be based on the use conditions, load characteristics, structure or member type and construction method, and the structural strength, stiffness and stability calculation shall be carried out respectively according to the normal use stage and the construction stage.

7.2.5 For projects that have undergone seismic safety evaluation of the project site, the seismic fortification intensity and ground motion parameters shall be determined according to the safety evaluation results.

7.2.6 The waterproof grade of the main structure should not be lower than the second grade, and the waterproof measures should be determined according to the environmental conditions, environmental action grade, design working life, structural characteristics, construction methods and other factors, and should meet the structural safety, durability and use requirements.

7.2.7 For tunnel construction, a special construction plan, monitoring plan, and emergency plan should be prepared for technical difficulties and quality and safety risk points based on factors such as geological conditions, the main structure of the tunnel, and the surrounding environment, and dynamic management of the entire process should be implemented.

7.3 Equipment and facilities

7.3.1 During the daily operation of the tunnel ventilation system, the concentration of carbon monoxide (CO), smog and other pollutants in the tunnel should meet the hygienic standards and driving safety requirements.

7.3.2 The ventilation system of the tunnel shall meet the environmental protection requirements for the vents, exhaust shafts and other places where polluted air is discharged.

7.3.3 The water supply system shall meet the requirements of tunnel fire water and operation management.

7.3.4 An independent drainage system shall be set up in the tunnel, and leakage water, rainwater, cleaning water and fire-fighting water shall be removed.

7.3.5 The first-level power supply loads in the tunnel should be powered by dual power sources, and the particularly important loads in the first-level loads should be powered by dual power sources, and emergency power sources should also be added.

7.3.6 The tunnel lighting standard should match the traffic flow and design speed, and meet the requirements of traffic safety and energy saving.

7.3.7 Tunnels should be equipped with operation and management facilities according to the scale and management needs. The tunnel operation and management facilities should have the functions of traffic monitoring, environment and equipment monitoring, event alarm and linkage control, emergency communication, command and dispatch, etc.

8.1 General provisions

8.1.1 Public electric vehicle facilities should be designed according to traffic factors such as urban road network form, land function layout, and travel structure characteristics, combined with road conditions...