"X time" means 2200 hours
Construction noise: the sound produced during the construction process that disturbs the surrounding living environment.
According to relevant laws and regulations, the prevention and control of construction noise pollution involves the following aspects:
Firstly, the emission of construction noise to the surrounding living environment within the urban area of a city shall comply with the nationally stipulated standards for the emission of ambient noise at the construction site boundary.
Second, within the urban area of the city, the use of machinery and equipment in the process of building construction, which may produce environmental noise pollution, the construction unit must, fifteen days prior to the commencement of the project to the local people's government at or above the county level of the local environmental protection administrative department where the project is located, to declare the name of the project, the construction site and the duration of the project, the value of the ambient noise that may be produced, as well as the prevention and control measures taken to prevent the pollution of ambient noise. measures taken. In case of refusal or false declaration, the administrative department for environmental protection of the local people's government at or above the county level shall give a warning or impose a fine according to the circumstances.
Third, in the urban areas of noise-sensitive buildings in the concentration of areas, namely, medical areas, cultural and educational research areas, and institutions or residential areas, it is prohibited to carry out construction work at night to produce environmental noise pollution, except for emergency repair, rescue operations and production process requirements or special needs must be continuous operation. The so-called "night time" means between 22:00 pm and 6:00 am. If there is a special need for continuous operation, there must be a certificate from the people's government at or above the county level or its competent department, and the nearby residents must be notified.
Expanded InformationReasons for Existence
At the construction site, it is with the progress of the project and the construction process turnover and the use of different construction machinery and construction methods. For example, in the foundation project, there are earth blasting, excavation trench, leveling and cleaning up the site, ramming, piling and other operations; in the main project, there is a steel skeleton or reinforced concrete skeleton, lifting components, mixing and pouring concrete and other operations; in the construction site, there are frequent from beginning to end of the transportation of materials and components; in addition to a variety of hammering, crashing, the collapse of the old building, the people shouting and so on. Therefore, the noise sources are various, and often change.
The average A sound level of the noise of the main construction machinery at the building site is shown in the table. These noise levels listed in the table are measured at a distance of about 15 meters from the noise source. Site operators are subjected to noise is also 10 to 20 decibels larger. They are no less exposed to noise hazards than workers operating in a strongly noisy workshop. Because construction machinery is mostly open-air work, surrounded by no shade, part of the machinery needs to move often, lifting and installation work need to work at height, so some of the noise in the construction of building construction has a sudden, impact, discontinuity and so on, especially prone to cause people's trouble. The figure shows the undulation waveform of the noise of certain construction machinery with time variation.
Noise standards
Many countries have formulated noise standards for construction machinery (which are noise indicators for factory-produced machinery) and construction site noise standards (which are standards for the maximum value of noise at the boundary of the construction site) in order to control noise at the construction site. In addition, in order to reduce the building construction noise, must take comprehensive measures from the following aspects:
①Improve the high-noise equipment, the development of low-noise construction machinery. Such as hydraulic pile driver, the measured noise level at a distance of 15 meters is only 50 decibels. Aerodynamic machinery can also effectively reduce noise after installing muffler and elastic support.
②Improve or change the construction method of high noise. Such as the use of less noisy vibration piling method and drilling and piling method. In addition, you can use the soft explosion method, welding instead of riveting, bolts instead of rivets and so on.
③Limit the use of high-noise machinery and adjust the time of high-noise construction, and arrange the noisy operation in the daytime as much as possible.
④Take temporary sound insulation enclosure structure or sound-absorbing sound insulation barrier, acoustic enclosure and so on.
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