project name: The design strives to make the pedestrian bridge across Xidan North Street become an important carrier for the display of “modern, humanistic, fashionable and internationalized†through the lighting design of the bridge body, so that the pedestrian bridge at night can be used with Xidan Commercial. The overall atmosphere of the street is integrated, and it can fully demonstrate the beauty and temperament unique to the structure of the bridge itself. ABB's intelligent control system completes the consistency of time control, eliminates the time error of the power supply system, and ensures the transformation quality of various animation scenes of LED. The application of the intelligent control system reliably controls the stopping of different scenes. The bridge lighting is macroscopically divided into major holiday scenes, general holiday scenes, and usual scenes;
Beijing Xidan commercial pedestrian bridges landscape lighting engineering design unit <br>:
Beijing Municipal Engineering Design Institute, Beijing Wo Yi Yong Yi Environmental Art Design Co., Ltd. <br> construction units:
Beijing Dongfang Electrical Equipment Co., Ltd. Blue Stone <br> Client:
Beijing Xicheng District Xidan Commercial District Environmental Rehabilitation Project Headquarters
1. Project introduction
Located in the most prosperous area of ​​Xidan Commercial Street, this project is the gateway to Changdan Street from Xidan Commercial Street. Xidan Commercial Street combines shopping, dining, entertainment, leisure and other functions. It has many large shopping malls such as Juntai Department Store, Zhongyou Department Store, Xidan Shopping Center and Xidan Saite, as well as Xidan Culture Square and Beijing Book Building. The area, in line with Chang'an Street in Xidan Times Square, presents a new, fashionable and modern business and cultural area, which has become an important part of Beijing's international and modern metropolis.
The newly built Xidan Crossing Bridge is the world's largest spanned all-aluminum pedestrian bridge. The bridge adopts the world's advanced high-strength aluminum alloy truss structure with distinctive structural features, giving people a stylish, modern and brief introduction. Comfortable feeling.
We strive to make the pedestrian bridge across Xidan North Street an important carrier for the display of “modern, humanistic, fashionable and international†Xidan through the lighting design of the bridge body, so that the pedestrian bridge at night can be used with Xidan Commercial. The overall atmosphere of the street is integrated, and it can fully demonstrate the beauty and temperament unique to the structure of the bridge itself.
The main idea of ​​the scheme is to reflect the unique structural beauty of the aluminum alloy truss structure by fully supporting and blending the bridge structure. Strive to combine modern lighting art means with modern bridge technology, fully demonstrate the beauty of the bridge across the night, and finally integrate with the modern and fashionable international business atmosphere.
2, the project details
(1) Detailed lighting technical indicators (including lighting quality and quantity):
The new pedestrian bridge in Xidan Commercial District, Xicheng District, Beijing is divided into 1#Xinqiao and 2#Xinqiao. Due to the same lighting scheme, one of the bridges will be described as an example: the main bridge of the bridge is 80m long and 8m wide; two secondary bridges They are 32m long and 8m wide. There are 4 ladders at the 4 corners of the bridge. According to the structure and characteristics of the bridge body, the lighting partition is divided into four parts: the outer wall of the railing, the bridge deck, the handrail of the ladder and the bridge belly. The lighting power is from the distribution box equipped with ABB intelligent control system. The distribution box can control the opening time of the lamp locally and ensure that the LED color changing lamps of different circuits can change color synchronously. A custom LED blue and white color changing lamp strip is installed on the outside of the bridge railing, and a PVC small uniform mask is installed outside each lighting point, and the brightness of the lamp is 15 cd/m2. The light source of the channel light installed at the bottom of the inner side of the railing is a large-rate LED. The light passes through the wire fence without glare and can increase the illumination and uniformity of the bridge surface, so that the bridge illumination reaches 25 Lux. The armrest light mainly highlights the wire guardrail on both sides of the stairway, the area illumination is 15Lux; the bridge belly is evenly illuminated by the high-pressure sodium floodlight mounted on the upper chord, and the illumination reaches 250Lux.
The Xidan Pedestrian Bridge LED lighting system adopts the TCP/IP protocol and is optimized by signal transmission, so that the connected devices in the entire LED lighting system are more connected and the distance is longer. The transmission control protocol makes the control quality and reliability of the LED lighting system. Higher; two-way communication makes the remote monitoring and control of the equipment more efficient, making the flyover LED landscape lighting control system more stable.
The bridge uses one control panel, 30 data distribution machines, and 45 data receivers.
Custom lighting 4 types
Color-changing LED light-emitting chip: 0.076W (RGB) light-emitting chip 76,820
Tianqiao LED landscape lighting control system features:
1 Modular design: The circuit design is divided into different modules according to functions. Only very little contact is needed between each module, which greatly improves the stability and reliability of the system.
2 Advanced scanning technology: The display part is divided into different units and scanned independently. The signal transmission between each unit adopts the signal latch technology to follow the synchronous control, and the stability of the display is greatly increased.
3 Well-designed communication interface technology: Communication distance up to 1000 meters, can resist ±15KV electrostatic discharge shock, Rs-422 special design interface, greatly improve the reliability of system communication.
4 display color:
· The brightness depth can reach 1024 levels;
·Color adjustment ability R, G, B 256 levels of independent adjustment · Display frequency up to 85Hz;
·100-level brightness adjustment, 16-level brightness adjustment without gradation loss;
·Self-detection function can detect the input interface signal (indicator report) in each controller in the system.
· Support users to configure the screen information by themselves;
·Power supply mode DC24V/AC110V-220V
· Support remote control, serial communication. 
All the lamps are fully opened during the major holidays, the brightness of the outer tower tip is 15cd/m2, and the other places with LED lamps, the brightness is 10cd/m2, and the bridge belly illumination is 250LUX;
During general holidays, the bridge belly lighting will be turned off, the brightness of the outer tower tip is 15cd/m2, and the other places with LED lamps have a brightness of 10cd/m2;
In normal times, only the top wall lamp and armrest light on the outside of the bridge railing are opened. The brightness of the top of the railing is 15cd/m2, and the illumination of the stairway wire fence is 100Lux.
　　 (2) Innovations in lighting design concepts and methods:
1 Design concept: This project is by far the largest all-aluminum bridge in the world. In our lighting design, the lamps and bridges are blended together. At the beginning of the bridge design, the interface of the lighting design is fully considered, and the overall design is made, so that the lamps become an integral part of the bridge itself, and strive to ensure the daytime landscape effect of the bridge. On the basis of the night, the light is used to show and shape the structural beauty of the bridge, and to sublimate it, and finally achieve the perfect unity of light and bridge. At the same time, in the lighting method, fully consider the commercial atmosphere of Xidan commercial area and the functional requirements of the traffic cross-street building, and achieve the perfect unification of the regional landscape atmosphere and the use of functional requirements.
2 The combination of non-standard special lamps and bridge structure: In order to ensure the daytime and nighttime landscape effect of the flyover, more than 90% of the lamps in the nightscape lighting design use non-standard special lamps, and the design team combines the bridge body. Different structural features of different parts, different designs of the lamps, and the selection of the material of the lamps, all selected high-strength anodized aluminum with the same structure of the bridge body, ensuring the complete expansion ratio of the lamp and the bridge structure. Consistently, it satisfies the structural maintenance requirements of the bridge body, so that the bridge body achieves the close integration of the lamps and the building structure.
3 Energy-saving, environmentally-friendly, long-life bridge lighting non-standard lighting all use LED light source, according to the functional use and structural requirements of different positions of stairway, handrail, guardrail, bridge deck, etc., adopt different specifications and forms of LED special type The lamps, after sufficient experimentation and aging, ensure the long-term stability of the bridge lighting. At the same time, after the calculation, it saves more than 20% of electricity compared with the conventional traditional lighting method.
4 People-oriented, fully consider the comfort of lighting: The project is located in the core area of ​​Xidan commercial area, is a cross-street pedestrian bridge, the flow of people at night is very large, so we have fully considered the hidden and glare-proof of the lighting in the lighting design. . On the one hand, we control the brightness of the vertical LEDs on the outside of the bridge and add filters to the interior of the luminaire to ensure the landscape effect without hindering the function of the road. On the other hand, for the illumination on the inside of the bridge and on the bridge, we use the reflective illumination of the embedded structure, which not only provides good safety protection, but also avoids glare, ensuring the comfort of walking people.