Road lighting requirements and principles Urban roads, especially urban expressways, must be equipped with traffic road lighting. Road lighting must meet the functional requirements, that is, to ensure road traffic safety, smooth, and so on, but also to beautify the urban environment, making the road a beautiful landscape. In order to ensure the quality of road lighting and meet the basic requirements of reliable identification and visual comfort, road lighting should meet the road surface brightness (or illuminance), brightness (or illuminance) uniformity and glare limit. Road lighting facilities should be inductive, safe, reliable, easy to maintain, technologically advanced and energy efficient.
Street lighting layout of street lights includes installation height, spacing, layout and so on. Reasonable layout is very important to improve the lighting effect, but it is often limited by many objective conditions. Therefore, under the current conditions, the light distribution characteristics of the lighting fixtures should be fully utilized to make the layout as reasonable as possible. Limited to the lifting capacity of the climber used for maintenance and installation of lighting fixtures, the height of the pole used in urban roads should not exceed 14m.
The installation angle of the lighting fixture is still related to the main area of â€‹â€‹the lighting and the height and distance of the luminaire. Although the installation angle of the lamp does not increase the average brightness and brightness uniformity, in the case of a certain average illumination, increasing the installation angle of the lighting fixture will increase the glare, so the installation angle of the lighting fixture is controlled in the range of 5Â° to 15Â° to reduce glare. . The length of the cantilever is combined with the actual situation, but it should not exceed 1/4 of the installation height of the lamp.
Light poles should be considered to avoid pedestrian zebra crossings, bus station platforms, etc. Street lighting arrangements at special intersections such as intersections should be designed according to the specific requirements according to the specific conditions; the light poles on the bridge should be professionally matched with the bridges to make the light poles Foundation, the position of the pole should avoid the expansion joint of the bridge. When the pole light is laid, avoid and limit the glare; when the high pole light is laid, it must meet the requirements of lighting, and avoid and reduce glare. The high pole should have a distance from the main road. A certain distance, in order to avoid the occurrence of bumper accidents, maintenance will not affect normal traffic, generally located in the green belt more than 10m away from the lane.
According to the geographical location and structure of the road, different lighting modes are adopted: the cross-section type of the roadway lighting expressway branch road is unified for the main road lighting, and the double-decker lamp with 9m pole height is set in the central separation belt of the branch line. Lighting, the pole length is 1.5m, and the lamp spacing is 30m.
The main road is the cross-section type of the main road of the road lighting expressway, the 36m wide lane, and only 1m wide shoulders on both sides. From the perspective of daily maintenance operations, road lighting uses double-row single-arm lights on both sides of the road. Because the drainage groove, 10kV cable pre-embedded pipe and wave guardrail are required in the shoulder, the street lamp can no longer be placed on the shoulders on both sides. Therefore, the design method should be set to 13m pole in the central 2m wide separation belt. Pick up the lighting fixture, the length of the pole is 2.5m, and the spacing of the lamps is 40m.
According to the "City Road Lighting Design Standards", high-speed sodium lamps should be used for expressways and trunk roads. The branch road lighting uses 250W high-pressure sodium lamps, and the main line road lighting 250W+400W dual-source high-pressure sodium lamps. The new 30m high pole lamp uses 1000W high pressure sodium lamp.
At the end of the construction section, the division of the construction is too small, other professional construction is not in place, invading the position of street lamps and power lines, some are not professional construction units, causing partial failure to meet electrical construction requirements, only on-site processing, in the design part of the details Explain the instructions as carefully as possible and reflect them on the relevant professional drawings to avoid similar problems during construction.
In order to design similar projects, it is necessary to summarize and improve the completed engineering design. The views and experiences of this paper are for reference by peers. The project was designed to begin in November 2003 and the final design was completed in November 2004. Now half of the road (west section) has been completed and opened to traffic. From the construction and completion conditions, the overall design is reasonable. On the actual road, imported high-quality single-source lamps (PHILIPS products) are used. The average illumination of road lighting has basically reached the design standard, and the completion acceptance has been passed.
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