Introduction <br> In recent years, efforts to build urban construction increased night lighting, such as Tianjin colonial period left many historical buildings in cities around the world, and more and more attention to the use of historic buildings landscape lighting to enhance its Night Angry and energetic. “Five Avenues†is a regional name, which is the collective name for six roads of Chengdu Road, Chongqing Road, Changde Road, Dali Road, Weinan Road and Machang Road. The street pattern and spatial relationship of the Five Avenues all reflect a kind of harmony, which is different from the traditional Chinese street pattern, which reflects the functional layout of the advanced planning ideas in the West at the time. Since most buildings are on the 2nd to 3rd floors, the street width is related to the height of the building and is kept within 1:1. The scale is pleasant.
The continuous wall unique to the Fifth Avenue forms a continuous streetscape with streets and buildings. From the outside of the street, through the revealing wall, you can see the lush tall trees in the inner courtyard. Another level of relationship can reveal the architectural features of different styles. The five avenues have various styles on both sides of the street, and various forms of architecture are concentrated here. At the same time, the continuous walls on both sides of the street connect these buildings together, increasing the overall continuity on both sides of the street, making the streetscape reflect in the change. Unite.
The nightscape lighting in the historical district plays a decisive role in enhancing the cultural atmosphere of the whole city and promoting economic prosperity. The special attributes of the historical style area determine its difference from other modern urban spaces. Due to the lack of relevant protection regulations in current lighting design, there are many shortcomings in the night lighting planning of the current historical scene.
1 Current problems with night lighting
1.1 Functional lighting is not sound 1.1.1 Road lighting
The original street scale of the five avenues is completely preserved. Among the six streets, except for Machang Road and Changde Road, as the urban traffic secondary trunk roads and branch roads to meet the basic traffic lighting, the illumination of other roads is significantly lower than the "urban road lighting design standards". The minimum standard of (CJJ 45-2006). China has not yet formed a complete set of night lighting specifications for historical features. The standard value of road lighting is determined according to factors such as vehicle speed and traffic flow. The traffic volume of each road in the Fifth Avenue area is randomly measured in the actual survey. The illuminance data is shown in Table 1.
According to the actual road illuminance data measured in the survey of the five avenues, the average illuminance of the roads in southern Anhui, Dali, and Chongqing is lower than the average illuminance of the third-level branch of the motor vehicle traffic lighting standard value. The dense street trees are another important factor that causes uneven illumination of the road. In the night landscape, the zooming space in the process of streamlined travel, the channel relationship between people and traffic, and the lighting design in the key areas or areas with obvious features will leave a deep impression on visitors and residents.
1.1.2 Square Lighting The Park Plaza interspersed with the five avenues provides a place for residents to have a rest and break, especially in the evening. The number of residents in the night has increased greatly. Many problems have also been revealed in the survey: people in the brighter areas Intensive, unmanned in the dark, the square illumination is severely uneven. In the actual survey, the Gannan Road Park with the largest area and the most residents' activities was taken as an example. The average illuminance in the square was less than 4lx. According to the “Design Specification for Urban Night Lighting†(JGJ/T163-2008), it does not meet the horizontal illumination of the square. 10lx minimum requirements.
1.2 The lack of illumination in the overall five-boulevard area has no color control in the macro lighting planning. The buildings in the building group have various light colors and different types of lights. The street lighting lacks the overall concept, which leads to the construction of night lighting and no focus; In terms of single illumination, only a large area of ​​floodlighting and small spotlights with obvious spotlights are used, which lacks creativity and expressiveness. The existing night lighting design method in the Fifth Avenue area is single, the lighting technology is backward, some of the lamps are improperly irradiated, the light color is out of balance, and the architectural style is not coordinated.
The celebrity's former residence is a tourist attraction of the Five Avenues. The former residence of the day is concealed in the walls and shrubs, and the building group itself creates a quiet and tranquil atmosphere. At night, most of the celebrities' former residences did not have any lighting measures, which seemed dull and boring. In addition, the use of colored light and various techniques in some commercial and entertainment buildings has not reached the most basic lighting principle of “seeing the light without seeing the lightâ€. The position of the light fixture destroys the aesthetics of the historic building, and the installation method is also on the masonry. The wall caused damage.