The particularity of the bridge structure in the city and its location are sometimes easier to enter than people's visions. You only need to look at the night scenes of each city to know the industrial beauty of a bridge (especially the night view). In many cases, it represents the aesthetic level of a city, which is more precise than the landmark. 
Among the many bridge structures, the cable bridge is a classic bridge structure, showing a subtle elegance and strength.
Photo: Xu Dongliang's cable bridge lighting design manuscript
What should be the night view of the cable bridge with the bridge deck, steel spine and cable as the main components?
Xu Dongliang believes that seeing the essence of things has completed most of the design. "When the bridge expresses its strength, you can see the momentum of the bridge. Where is the light used? How much light is used? These do not need design and need The design aspect is also an aesthetic consideration for the designer and a judgment on the mechanics of the bridge."
The steel ridge beam is beautifully shaped, and the steel shaft is beautifully expressed. The cable and the bridge body are used as auxiliary:
Photo: Xu Dongliang's work, Suyang Bridge night scene, elegant steel ridges become the core of the night landscape composition, the light and dark interaction makes the scenery more imaginative.
Picture: Guangzhou Haiyin Bridge night view, comprehensively taking into account the way the cable, the bridge body, and the steel backbone are illuminated, and each part uses RGBW color change, but fills all positions with multicolored light. The feeling is that people have no imagination and make the bridge look flat and gaudy.
Picture: The cable-stayed bridge in the same city as the Haiyin Bridge – Guangzhou Liedeqiao Lighting is much more savvy. The appearance of the middle steel ridge structure and the light of the arch are distinguished by the three-dimensional sense. As the key image of the whole bridge, due to the characteristics of the cable method, the point light source is also interesting to the drawing of the cable node.
Then, we have seen the different night scenes of the cable bridges. It is a means of design. What kind of lamps and illumination methods are needed to achieve these designs?
This article reveals:
First, the way of light projection
Advantages: easy installation and maintenance, no damage to the cable and wind resistance, to ensure safety. The night view of the bridge maintains its original features and style.
Disadvantages: Can not do the decorative lighting effects such as running water, horse racing .
Lamp installation: very convenient, but there are skills, you need to achieve angle adjustment in both directions.
Light distribution requirements: The use of light distribution and light distribution of the floodlights is very technical.
For example, the following figure shows an example of the Longwan Bridge. The cable part is flat-shaped with light: 0°-180° with a 30° angle, 90°-270° with a 10° narrow angle. The pylon section uses 480W high-power floodlights on each side, and the three light distributions are 3°, 5°, and 15°. Installed at different positions and projection angles to achieve uniform illumination of the 200-meter pylon.
Photo: Foshan Longwan Bridge night lighting example
Figure: Details of the use of the bridge
Figure: Lamp installation location
The final rendering effect:
Second, the use of point light source and light combination
Advantages: In addition, the cable is fixed by a separate cable without damaging the force and wind resistance of the bridge cable. It can realize various changes such as running water and horse racing.
Disadvantages: Installation and maintenance require high-altitude operations and high maintenance costs.
Installation of the luminaire: convenient, but there are techniques to ensure the tidyness of the bridge.
Light distribution requirements: The light distribution of the point source is very technical, and it is necessary to ensure that the brightness of the lamp is the same at all angles.
Special requirements: Due to the color of the bridge itself, there are special requirements for the surface color of the luminaire.
Photo: Day view of Wuhan Parrot Island Yangtze River Bridge
Photo: Night view of Wuhan Parrot Island Yangtze River Bridge
The beam body and the cable are combined with point light illumination and linear illumination.
Floodlighting is applied to bridge towers, piers, etc. The pylon illumination gradually decreases from bottom to top and has a smooth transition.
The lighting control adopts the combination of light control and time control, and adopts a modular intelligent control system for landscape lighting to meet the creation of various atmospheres. Lighting control methods are divided into multiple modes: weekday mode (spring, summer, autumn, winter, four seasons), weekend mode, holiday mode.
Figure: Schematic diagram of control
Figure: Distribution of lamps used
The main color of the bridge is dark red, so when selecting the line type wall washer light source, R9≥90 is required to effectively restore and match the original color of the bridge.
The zipper LED point light source has a diameter of 355mm, and the night view effect of the bridge as a landmark can be seen from a long distance. The prism cover is equipped with light to ensure that the brightness of the luminaire is consistent at all angles and there is no glare to the running vehicle.
Figure: Lamp installation location
Third, counterexample: cable hoop way
What needs to be clear is that whether it is lighting design performance or engineering implementation, this method is the best policy. It is neither safe nor beautiful. It is equivalent to an extension of the wonderful practice of building the hook. It belongs to the counterexample of the market.
Advantages: The lighting fixture is combined with the stay cable; it can realize dynamic changes such as running horses.
Disadvantages: installation and maintenance require high-altitude operation and sealing, and the maintenance cost is high. This way of installing the lamp changes the stress and wind resistance of the stay cable, which is not allowed from the perspective of the design institute, and the safety factor is low.
Installation of lamps: very troublesome, need to work at heights.
Light distribution of lamps: no light distribution requirements.
Figure: Hoop installation example, Kaiser Bridge
Figure: Lamp installation location
summary:
Night lighting is a popular aesthetic show. It is moving from a demonized madness to a rational return in the past few years. The night scene always solves the problem of “being seenâ€. Therefore, technology is to serve art design. The aesthetic level is the core issue; secondly, the key to technology is to realize the designer's vision, and even the technology that the basic security line can't reach should be clearly abandoned.
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