sunshine, the glass curtain wall of the sub-center library shines brightly, and what is more "bright" is that a series of independent innovative technologies have successively broken through the world-class construction problems, writing a shocking engineering initiative for the project of one of the "three major buildings" of Beijing's urban sub-center.
Single piece of glass weighs up to
11.7 layers of bonded "super glass" and "corrugated paper" type W fold line
super-large glass supports each other to achieve "the first case at home and abroad"
how to integrate the "forest" inside and outside the library to create the impression of "transparent book garden". Depending on the final effect of the design and construction of the super-large glass curtain wall, Zhongjian Shenzhuang pioneered the construction system of the whole glass curtain wall. The facade of the library is wrapped in 276 pieces of "super glass", with high transparency and openness to allow sufficient sunlight to enter. While blurring the sense of boundaries, readers sitting in the bright book reading area seem to be surrounded by forests.
For book lovers, the library is the most beautiful building. In order to realize the unique visual perception of "Transparent Bookstore", the curtain wall of the library presents a W fold line shape similar to "corrugated paper". "These glasses have 14 angles ranging from 74 degrees to 133 degrees. There is no supporting keel between the glasses. They are completely self-supporting systems supported by a large piece of glass itself. Each piece is unique and irreplaceable." Yang Ying, who is in charge of the curtain wall design of the library of China Construction Deep Decoration Vice-Center, proudly said that as the first self-supporting curtain wall at home and abroad, the zigzag design was adopted between the glass plates to bear the load.
China Railway Construction Group, introduced that the glass curtain wall uses double-silver low-E toughened laminated hollow ultra-white glass, each piece of glass is 13 thick. In other words, each piece of glass has seven layers, and the middle of each layer of glass needs to be glued manually on site. O as to inject a plurality of layers of double-component performance silicone structural adhesives to increase the strength of the glass.
Because these "super glass" also need to be cut and opened, the manufacturing process of each piece of glass takes about 2 months. The vivid practice of this super project has also helped China's glass sheet manufacturing, high glass deep processing and gluing, and super-high curtain wall construction technology to enter the international first-class ranks.
"Super Glass" also has the unique advantages of energy saving and environmental protection. Each piece of glass is coated, which can effectively isolate the strong outdoor light, and there is a 2 cm hollow layer in the middle, which can better isolate the heat transfer. "This group of glass curtain walls can reduce building energy consumption by about 8% throughout the year." Li Yong revealed this little-known figure.
Transmittance stepless change to reduce energy consumption
Innovative application of electronic dye liquid crystal intelligent dimming glass
Beijing Investment Group Co., Ltd. and general manager of the three major construction projects, said that on the lighting roof of the library, a new type of electronic dye liquid crystal intelligent dimming glass was innovatively applied, covering an area of 1350 square meters. The application of
dimming glass also combines intelligent control technology with dimming technology. Compared with traditional glass, it can reduce the shading coefficient from 0.45 to 0.28 to 0.
In fact, the beauty of dimming glass is far more than that. It can also control the visible light transmittance between 8.7% and 32%. By adjusting the transmittance of the glass, the dimming glass can reduce the transmittance at noon when the light is sufficient, so as to ensure that the reader will not feel the dazzling light, and reduce the energy consumption of air conditioning. In the morning and evening, it can increase the transmittance to save lighting and heating power.
Customized Vacuum Electric Suction Cup Hoisting with "Curtain Wall Artifact"
Innovative Research and Development of Steel Groove + Sliding Block Anti-seismic and Anti-deformation
20 groups of suckers is more than 3 tons. "Each group of vacuum Chuck is controlled by PLC programmable logic controller, which is composed of independent vacuum pump, vacuum circuit, mechanical safety system and electrical control system.". These suckers can also be freely combined according to demand to achieve the installation of any weight of glass under 12 tons, which can be called "curtain wall artifact". In order to ensure the installation quality, the curtain wall glass system has passed the four tests of "wind pressure deformation performance test", "rainwater permeability performance test", "air permeability performance test" and "plane deformation performance".
As a "transparent book garden", the library should not only support the space of knowledge, but also withstand the test of disasters such as earthquakes. "The stability and seismic design requirements of these curtain wall glass are extremely high. Beijing belongs to the high seismic intensity area, and the curtain wall must be able to withstand strong horizontal seismic displacement deformation." Yang Ying said.
In order to adapt to the horizontal displacement and deformation of the earthquake, Zhongjian Deep Equipment has independently developed an arc sliding block in the middle of the steel beam at the bottom of the glass, which can adapt to the horizontal displacement and deformation of the 120 mm earthquake. The glass can realize the in-plane and out-of-plane swing and dislocation of the glass through the arc-shaped sliding block, thereby absorbing the horizontal seismic displacement. A hidden pin shaft is designed inside the arc-shaped sliding block, which can not only make the glass swing, but also prevent the glass from sliding out of the arc-shaped sliding block, thus further improving its shock resistance.
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