I. Introduction to the Qingdao Bay Bridge Project
Qingdao Bay Bridge is the starting point of the national highway network Qingdao-Lanzhou expressway. It is an important part of the main frame of the “five vertical, four horizontal and one ring†road network in Shandong Province, and it is also the cross-sea passage of the east and west coast of Jiaozhou Bay planned by Qingdao. "One bridge" in one road, one bridge, one tunnel. The first phase of the Qingdao Bay Bridge starts from 200 meters north of the Licun River Bridge on Qingdao’s Side Ring Bay Road. It is 1 km east of the Jiaozhou Bay Expressway on the Huangdao side, and the design start point of the Jiqing South Line is followed. The Red Island Interchange is set up in the middle. The red island connection line is connected. The main line has a total length of 28.047 kilometers, including 25.171 kilometers of the sea-crossing bridge, 749 meters of Qingdao side wiring, and 1.3 kilometers of yellow island side wiring. The main line bridge is 35 meters wide and has six lanes in both directions. The design speed is 80 km/h.
After the completion of the Qingdao Bay Bridge, it will become one of the landmarks and important attractions of the island city. In order to ensure the safety of driving at night and to show the unique charm of the Bay Bridge at night, it is necessary to carry out an aesthetic design lighting design for the bridge. To this end, not only need to care about the needs of bridge traffic safety, but also need to care about the interaction between the bridge and the surrounding environment, and care about the symbolic significance of the bridge. The night illumination of the Bay Bridge should be both functional and landscape-oriented. Combine the two to achieve a comfortable and safe lighting effect, and realize the organic unity of the bridge traffic function and the landscape function.
Second, lighting design requirements
The Qingdao Bay Bridge is located in the bay. The natural environment is complex and the climate is harsh. Its lighting scheme must be based on the full familiarity and understanding of the local geography and climate. According to the technical specifications of the highway and bridge, the operational requirements and natural conditions of the bridge are combined. And design. In addition to the need to design energy conservation, environmental protection and intelligence, we also need to fully consider the landscape effect. Its design requirements are as follows:
1, in line with the lighting function requirements
The lighting of the bridge directly affects the driving safety of the vehicle. In the lighting design, certain brightness and uniformity must be ensured, so that the driver can clearly distinguish the road traffic situation and traffic signs without feeling the eye fatigue and glare. Control is especially important to ensure traffic safety. Since the sea surface tends to have large humidity, foggy days and low visibility, it is also necessary to consider the fog permeability and inductivity of the light source. At the same time, the choice of brightness should comply with the relevant regulations of night lighting, and suppress light pollution.
2, high reliability
The Qingdao Bay Bridge has a long distance and its environment is characterized by high salt spray, thunderstorms and typhoons. Therefore, the selection and installation of the luminaire should fully consider the factors of earthquake resistance, wind resistance, corrosion resistance and easy maintenance. The system equipment should have multiple protections to resist inductive lightning strikes and grid surges, waterproof gas intrusion and salt spray corrosion; in the case of individual equipment failure, the system can still operate stably without affecting or affecting the lighting system's on-time opening and closing. . The single lamp can be self-regulating, which can overcome the influence of grid and long-distance power supply voltage fluctuations on road lighting and facilities, and prolong the life of the light source.
3, environmental protection and power saving
In order to meet the lighting requirements, a larger number of lamps need to be installed, which brings about a huge power consumption. To this end, energy-saving lamps should be selected as much as possible in order to meet the lighting function requirements. The street lamp control system is used to control the switch state and illumination control of the street lamp according to the traffic volume and environmental conditions to reduce the power load of the lighting system.
4, enhance the bridge aesthetics
The overall lighting effect is to create a good night image of the building, and its lamp position can not destroy the daytime image of the building. As part of the landscape, bridge lighting needs to be ornamental and decorative. The lighting design should grasp the architect's design style and intention, and without changing the original style, structure and layout of the bridge, make it glow different from the daytime at night, and structure and decoration details of the key parts of the building. The display is more vivid and magnificent.
Third, the bridge lighting technical parameters
Qingdao Bay Bridge is an important traffic artery connecting Qingdao, Hongdao and Huangdao. The speed is fast and the flow is large. The lighting requirements of the whole bridge are very high. Since the current national standards for LED low-altitude lighting are not implemented, refer to the International Commission on Illumination CIE. The seven technical parameters of the bridge lighting quality provided are: bridge deck average illumination, bridge deck uniformity, glare threshold increment, lamp temperature rise, lamp life, IP rating, LED particle efficacy.