Rail transit noise reduction box type bridge and external bonding noise reduction method of rail transit box type bridge

Abstract

The invention discloses a rail transit noise reduction box type bridge and an external bonding noise reduction method of a rail transit box type bridge. The rail transit noise reduction box type bridge comprises a box type beam, wherein at least one first acoustic board used for reducing vibration noise and carrying out thermal insulation is installed on the outer side of the side wall of the box type beam; the first acoustic boards are arranged on the outer surface of the side wall of the box type beam at intervals through a first supporting mechanism and are arranged in a direction which is parallel with or in oblique crossing with the outer surface of the side wall of the box type beam; and / or at least one second acoustic board used for reducing the vibration noise and carrying out the thermal insulation is installed on the outer surface of the bottom board of the box type beam; the second acoustic boards are arranged on the outer surface of the bottom board of the box type beam at intervals via a second supporting mechanism; the second acoustic boards are arranged in a direction which is parallel with or in oblique crossing with the outer surface of the outer surface of the box type beam.

Description

technical field [0001] The invention relates to an on-site assembling method of a prefabricated structure, in particular to a novel node connection construction method of the prefabricated structure. Background technique [0002] The rapid development of urban rail transit has brought inevitable environmental vibration and noise pollution to the lives of residents along the line, and seriously affected the daily use of high-precision instruments in high-tech production enterprises, hospitals, and scientific research institutions along the line. For this reason, controlling the pollution of urban rail transit vibration and noise to the environment has become an important issue to be studied and solved urgently in the field of environmental protection. Concrete box girders are mainly used in urban elevated tracks in my country, and the "secondary noise" radiated by them is mainly low-frequency noise. The inner cavity of the box girder has an acoustic mode in the main frequenc...

AI Technical Summary

Problems solved by technology

Traditional sound barriers can block high-frequency noise, but cannot block low-frequency noise from bridges

There are also sound-absorbing materials on the side of the box girder, which can reduce the internal noise of the box girder, but have no effect on the noise caused by the side wall and bottom plate of the box girder.

If an integral sound insulation and noise reduction measure is taken to completely cover the bridge, the cost will be too high

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