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Sound insulation screen - also known as sound barrier
Progress: The overall project is coming to an end
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Yesterday, reporters from Shenyang Evening News and Shenyang Net saw at the construction site of the northern section of the elevated bridge that the asphalt concrete on the bridge deck has been paved and is currently being installed with auxiliary projects such as sound insulation screens and expansion joints. The overall project of the elevated bridge is coming to an end, and the bridge will be ready for traffic by the end of this month, and the ground roads will also be open for traffic simultaneously.
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The construction sites of the North South Expressway are mostly located in the core urban area. In order to accelerate the construction progress and reduce the impact on surrounding residents, the construction party has adopted prefabricated central isolation walls and steel box girder top sliding construction technology in the construction of the northern section of the elevated bridge. Prefabricated components and on-site assembly will be used to construct the 2.4-kilometer central isolation wall. This new type of prefabricated construction technology will bring smoother traffic and a quieter environment to the surrounding residents.
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Highlight 1: Building a bridge with 20 building blocks for about 20 days
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The construction of the elevated bridge has adopted the "; Building blocks into a bridge; Construction technology. Build the upper deck of the bridge through prefabricated products. Including the bottom plate, top plate, and transverse partition. The prefabricated parts are all cut by computer, accurate to the nearest minute. After the construction is completed, the bridge slabs are assembled seamlessly, and the gaps between the slabs are precise to millimeters.
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If the main body of the bridge is constructed using traditional methods, it will take 5 to 6 months to complete; Building blocks into a bridge; It only takes about 20 days. The number of workers has also decreased from over 90 to 20.
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Highlight 2: Top sliding of 70 meter steel beam
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The steel box girder erection project crossing the Shenji Railway and the Xinkai River section is an important node project in the construction of the entire elevated bridge. The steel box girder has a span of 70 meters, a width of 17.5 meters, and a total weight of 845 tons. This is also the use of the top sliding construction technology for steel box girders with a length of up to 70 meters in the Shenyang area.
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It is reported that the 70 meter long steel box girder is manufactured, transported, and installed in sections by the factory. The steel box girder is divided into 12 sections, with the heavier section weighing 90 tons. The installation operation of steel box girder top sliding is to weld each section of steel box girder, push and slide it to the design position on the platform, and then proceed to the next section of steel box girder welding and top sliding. After 12 sections are connected, a steel box girder spanning 70 meters across the Shenji Railway and Xinkai River section is formed.
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Highlight 3: Fully enclosed soundproof screens used throughout the city
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From the north side of Tuanjie Road to the elevated bridge section of Xinkaihe, along the way, it is adjacent to multiple residential buildings such as Shenyang No. 90 Middle School, Renji Hospital, Bianqiang Community, Shizi Community, and Kaixuan Community. In order to reduce the impact of traffic noise, a fully enclosed sound insulation screen will be installed on the north side of Tuanjie Road to the elevated bridge section of Xinkaihe. This is also the installation of fully enclosed sound insulation screens on elevated bridges in Shenyang.
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The total length of the soundproof screen on this section of the road is 816 meters. Similar to the tunnel style mode, the new material greatly enhances the corrosion resistance of the sound insulation screen, prolongs its service life, and has a more significant sound absorption effect. The landscape window adopts 15mm thick reinforced acrylic impact resistant transparent soundproof panel. In order to prevent safety accidents caused by accidental impact and falling of soundproof panels, all sound-absorbing panels and soundproof panels are installed with anti falling steel wire ropes, which is a technology used in the construction of soundproof screens in Shenyang. The daylighting shed adopts transparent soundproof materials, and LED lighting and air exchange ports are installed at the top of the soundproof screen. Vehicles driving on the elevated bridge feel like a sightseeing tunnel, without any sense of oppression. Driving a car on a fully enclosed soundproof screen is like traveling through a tunnel; Air Tunnel;, It will become another kind of scenery in the city.
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It is reported that fully enclosed sound insulation screens are only available in a few cities such as Beijing, and are currently an effective noise reduction method for urban road traffic. They can keep the noise generated by vehicle driving and the reflected noise inside the sound barrier, and can block traffic noise by 25-30 decibels.
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