When designing the tunnel approach lighting, before entering the tunnel (at night): Because the brightness inside and outside the tunnel is very different, from the outside of the tunnel, the tunnel entrance looks like a bright hole, and there is a strong glare. The driver feels extremely If it is not suitable, it will take some time to see the inside of the tunnel.
At the exit of the tunnel: When the night car passes through the long tunnel and approaches the exit, the tunnel exit will see a black hole, so the driver can't see the line shape of the external road and the obstacles on the road.
The above two situations can be improved by setting the approach road lighting. The road tunnel specification has a special description for the outer tunnel approach lighting. The street light should be arranged outside the tunnel. The length of the lamp and the road surface brightness should not be less than the requirements shown in 1.
Therefore, highway approach lighting plays a vital role in traffic safety. Calculate the driving speed/( km h - 1) road surface brightness / ( cd m - 2) length / m 100 2. 0 180 80 1. 0 130 60 0. 5 95 40 0. 5 60 Shaohuai Expressway Tunnel Construction
The Shaohuai Expressway in Hunan Province is built on the standard of fully enclosed, full interchange and two-way four-lane expressway. There are 8 interchanges in the Shaoyang-Huaihua section. There are 2 tunnel details in 14 tunnels and 4 tunnels over 1 km. Among them, there is a Xuefengshan tunnel with a special length of 7 km. They are double-hole one-way tunnels with single lanes for two lanes, a building height limit of 5 m and a design speed of 80 km / h.
Tunnel Details Shaohuai Expressway Tunnel Lighting Solution Shaohuai Electrical and Mechanical Engineering Tunnel Lighting System is a complete system that fulfills the functions of the specified system. The tunnel lighting facilities referred to here include tunnel lighting and tunnel tunnel lighting. The tunnel interior lighting is divided into three main parts: tunnel main hole, pedestrian (car) horizontal hole and emergency lighting.
As the Shaohuai Expressway tunnel is located in the hilly and heavy hills, the sunshine is more sufficient, and the daytime hole is still brighter in the field. The design is considered at 4 000 cd / m2. Tunnel lighting design standards see 3.
The Shaohuai Expressway tunnel group and the bridge and tunnel are connected with more sections, and the road conditions are more complicated. Therefore, the design requirements for the tunnel are high to ensure the safety of Shaohuai Expressway.
3 Tunnel lighting design standard tunnel section length / m design brightness / ( cd m - 2) field brightness 4 000 inlet section 84 140 transition section 1 72 42 transition section 2 96 14 basic section L 4. 5 exit section 60 22. 5 Pedestrian access 30 2 lanes 30 2 emergency stop belts 40 7 holes outside approach lighting 130 1 Previous highway tunnels outside the approach road lighting is basically a 10 m high single-arm steel pole street lighting outside the tunnel tunnel The design brightness is 1 cd / m2, the lamp spacing is about 30 m, and the light source is 250W or 400 W high pressure sodium lamp.
After entering the site, a detailed investigation was carried out on the site topography and construction. According to the actual situation of Shaohuai Expressway construction, the experts, owners, design and supervision were fully discussed in the joint design stage, and tunnel tunneling was set up. Integrated lighting scheme, which combines the characteristics of landscape lighting, 15 m pole light, specific street lights on bridges and bridges and original design 10 m street lights, using different approach lighting schemes in different sections to achieve The appearance of the lighting and the entrance, the road conditions, the terrain and the natural conditions combined with the actual situation.
At the Shaoyang end of the Dongkoutang tunnel, according to the construction of the landscape belt outside the cave, the corresponding two-way landscape lighting streetlights were set up. It not only satisfies the requirements of road lighting, but also provides nighttime illumination for the landscape outside the cave, so that the landscape effect can be fully exerted.
In the Dawan Tunnel Group and the Lashan Tunnel Group, the bridges and tunnels connected to the tunnels and the tunnels are connected with 15 m 6 or 8 middle pole lights to simultaneously illuminate the four holes, which not only solves the problem of the installation position of the section without street lamps, but also The opening has a simple, atmospheric feel, while still meeting the requirements of the original design illumination.
Because the bridge between the furnace tunnel and the arch dam tunnel is the bridge connection, the bridge guardrail has been completed, there is no place to do the streetlight foundation, but the distance of the bridge is very far, and the left and right lines have more than 100 m. The driving safety has a great impact. Through the inspection with the owner, design and supervision to the site, it is finally determined to install the street lamp bracket on the bridge guardrail. First, customize the street lamp base bracket instead of the street lamp foundation, fix the bracket on the bridge guardrail through the chemical riveting bolt, and then install the street lamp on the bracket to achieve the effect of the approach lighting. Through the change of this program, it not only ensures that the highway construction meets the normative requirements, but also solves the problems in practice, and provides various ideas and solutions for the highway design in the future.
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