Hunan builds the world's longest glass bridge and creates many world's first
It has to be said that China now has relatively mature technology in architecture, and dare to try to bring you all kinds of architectural surprises. According to the latest news report, Hunan Province of China has set another world record. Recently, the glass bridge in Zhangjiajie Grand Canyon, Hunan Province, has come to an end after the previously created Bailong TIANTI in Zhangjiajie won the highest outdoor elevator. The bridge deck steel box girder will be closed tomorrow and open to the public before May 1 next year. This glass bridge built between two high mountain canyons has created many of the world's best.
The bridge is located in lishuya and wuwangpo area of Zhangjiajie Grand Canyon Scenic Area. It is a landscape bridge and has the functions of pedestrian passage, sightseeing, bungee jumping, sliding rope, T platform, etc. The main span is 430 meters, one across the canyon. The bridge deck is 375 meters long and 6 meters wide. The relative height between the bridge deck and the valley bottom is about 300 meters. The length and height of this transparent glass bridge rank first in the world.
Set a number of world first
Wan Tianbao, deputy chief engineer of China Railway Bridge Research Institute Group, is the designer of the bridge. According to Wan Tianbao, this glass bridge with landscape between high mountains and canyons is the first in the world. It has many of the world's first names:
The world's longest glass footbridge;
The world's highest bungee jumping platform is built on the bridge deck;
The steepest rope in the world;
The world's first large opening space cable plane suspension bridge;
The world's first large-scale bridge with glass as the main stress structure;
The bridge with the smallest ratio of girder height and span in the world;
The world's first super long span suspension bridge without wind cables;
It is the first bridge in the world to use a variety of damping devices to suppress vibration in different directions at the same time.
It is reported that at present, four new glass plank roads have been built in China's Alpine scenic spots, namely, the glass plank road of Tianmen Mountain National Forest Park in Zhangjiajie, Hunan Province. It is 60 meters long and 1.6 meters wide, and the highest elevation is 1430 meters. In addition, new glass plank roads have been built in Baishi mountain, Laiyuan County, Hebei Province, Tianyun mountain, Pinggu, Beijing, and Tiantangzhai, Luotian, Hubei Province.
Wan Tianbao said that these glass trestles are only footpaths built around mountains. They are totally different from the glass bridges built in high mountains and canyons this time. There is no precedent in the world. Many foreign bridges across canyons are mostly wooden or concrete structures.
Placing glass balls to disturb pedestrians
The site of the bridge is located in a karst landform with deep valleys and undulating hills. And the wind speed at the bridge site is larger.
According to these characteristics, the bridge is designed as a large span suspension bridge. Wind stability and human induced vibration control design are the most important key technologies. "When many people walk on the bridge, it is easy to cause resonance, leading to the deformation of the bridge structure. To avoid pedestrians walking in unison, we will place a lot of glass balls on the bridge deck to contain the vibration. According to reports, each glass ball weighs up to 400 kg. Due to the different positions, it objectively disrupts the pace of pedestrians and has the effect of restraining vibration.
It is reported that the Zhangjiajie Grand Canyon glass bridge deck will be paved with toughened anti-skid glass, three layers of laminated glass, a total of 99 pieces of glass, 4.856 cm thick. What is the effect of this kind of glass on load-bearing, explosion-proof and antifreeze? Wan Tianbao revealed that a number of tests have been done before. In order to prevent low-temperature cracking, the material selection is very strict, which greatly reduces the impurities in the glass. He also drives the car on the glass for pressure test. Every piece of glass will go through many tests, such as anti freezing, anti explosion, anti mildew, anti temperature drop and anti-seismic, to ensure zero error and zero risk. According to the design, the maximum tourist capacity of the bridge deck is 800 people, and tourists do not need to worry about the pressure of the bridge deck glass, "it can be said that it is as solid as gold.".