Scheme background

In recent years, the continuous expansion of China?s urban scale, the intensification of urbanization process, with the further development of urban construction, the pollution caused by construction noise is more and more serious, resulting in the continuous occurrence of disturbance incidents, the surrounding people on the living environment has caused a certain impact. For the construction of construction sites, it can be roughly divided into four parts, including earthwork stage, piling stage, structural stage and decoration stage, however, due to the improvement of construction technology and construction efficiency in China in recent years, the construction distinction of each stage is not very obvious, and even the mixed construction of each stage.

At the same time, the main noise sources of each stage of the construction are different, so the noise and noise caused by the construction are not the same. At the same time, due to the lack of management responsibility consciousness of the construction unit, in order to pay attention to the construction progress of the project, it is impossible to carry out reasonable and safe construction according to the construction standards. In the construction of earthwork stage and in the process of building demolition, the general use of construction machinery excavators, loaders, bulldozers and transport vehicles and other machinery, the mobility of mechanical equipment is the main source of noise earthwork stage, the construction site people around the normal production and living has brought great influence.

At the same time, the movement range of various large transport vehicles is relatively large, and the noise generated is relatively small, but the range of its noise influence is relatively wide. And the Bulldozer and excavator and other mechanical equipment working range is small, but its noise is large, the impact on the surrounding is greater. According to the field test measurement, in the earthwork stage of construction, the sound power level range of the noise source used by the construction machinery is generally 100~120dB (A), and the sound source is not obvious directional. In the foundation construction stage, the noise source of the construction site is generally a variety of pile drivers, some drilling, pick and mobile air compressor and other mechanical equipment. The noise source in this construction stage is mostly a fixed sound source, among which the most important one is the noise of the pile driver. Although the construction period in this stage is relatively short, the noise of the building construction is relatively large, and the noise pollution is very serious.

Therefore, in order to prevent and control the noise pollution of construction and improve the quality of acoustic environment, China has formulated the Environmental Noise Emission Standard of Construction Factory boundary (GB 12523-2011), which has clear requirements for the emission of construction noise.

product presentation

OEM-Z02 noise on-line monitoring system, conform to the requirements of the construction noise automatic monitoring system, core components with CPA certificate, through the Internet of things technology and the field instrument connectivity, complete the environmental noise data real-time acquisition, to measure all kinds of noise frequency and time meter sound pressure level, equivalent continuous sound level, statistical sound level, and other acoustic evaluation, it has integral average, statistical analysis, etc., real-time data sent back to the back end supervision platform.

Device group wants to be a part of it

(1) All-weather outdoor microphone

Outdoor microphone has wind, rain, dust and interference design to adapt to the purpose of outdoor long-term continuous use. The wind hood of the outdoor microphone will interfere with the accuracy of the noise test. The outdoor sensors used in our online monitoring system have obtained China measuring instrument type approval certificate CPA

(2) Noise acquisition and analysis unit

The noise acquisition and analysis unit has the function of signal acquisition and data analysis, and can ensure data storage. The noise collection and analysis unit of the environmental noise online monitoring system is not simply a sound level meter for signal acquisition, but an industrial level industrial control machine, specially developed the signal acquisition software suitable for the automatic noise monitoring system

(3)  Communication unit

Realize the data communication from the noise substation to the software server of the noise monitoring system. The online monitoring system of environmental noise adopts 4G wireless communication, which can meet the basic data transmission of the system and ensure the stability of transmission.

(4)  Power control unit

Provide power supply to prevent the influence of external power jitter on the measurement accuracy and protect the noise monitoring sub-station from the external surge attack.

(5) chassis

The environmental noise adopts all-weather protective box in the online monitoring system, which meets the IP 65 standard and has the grade certificate. It can be used to place the noise collection and analysis unit, data acquisition board, power control unit, etc., to play the role of wind prevention, rain prevention and anti-theft.

(6)  Ball machine camera and sound pickup

The real-time monitoring of the site environment can be realized, the excessive data can realize the field environment video and environmental noise pickup, and the actual situation of the site can be viewed through the platform playback function.

(7) column loudspeaker

This configuration can realize the function of remote propaganda, and the management personnel can check the situation on the scene through the remote camera. If serious noise pollution behavior is found, they can shout remotely through the APP, and the site personnel hear the instructions. At the same time, they can talk with the background management personnel through the field equipment pickup.

(8) Oriented radar

Sound pickup, environmental noise monitoring, special noise event detection and sound source positioning within 360°, can exclude the noise interference in other directions, and only pay attention to the size of the sound source in the specified area

technical parameter

(1)  The electroacoustic performance meets the requirements of GB / T3785.1 for level 2 or above.

(2) Have A rights and C rights.

(3) The self-generated noise shall not be higher than 25 dB (A), and the measurement range of the single measuring range shall not be less than 30 dB (A) ~130 dB (A)

(4)  The measurement parameters include instantaneous sound level Lp, equivalent sound level Leq, cumulative percentage sound level LN (N=5,10,50,90,95), maximum sound level Lmax, minimum sound level Lmin, standard deviation SD, etc., support remote setting of statistical analysis time, and can generate hour statistics and day statistics (Ld, Ln, Ldn) simultaneously

(5)  It has the calibration function of the remote complete machine (including microphone) and can set the self-calibration frequency, and automatically prompts when the value deviation before and after the calibration is greater than 0.5 dB.

(6)  Support the relevant requirements of long-term continuous automatic monitoring of construction noise, data processing and evaluation of construction noise, such as: meeting the requirements of long-term operation stability, with single measurement equivalent sound level calculation, data audit background noise acquisition and calculation function, etc.

(7)  It has the function of collecting meteorological parameters, and supports the expanded monitoring of meteorological parameters, including atmospheric temperature and humidity, wind speed, wind power, wind direction, atmospheric pressure, rainfall, etc.

(8)  With audio and video collection function, used to monitor the night construction behavior, and manual audit data and discrimination of noise measurement type. During on-site monitoring, monitoring personnel rely on listening and observing to judge the measured source of noise, and automatic monitoring mainly relies on manual listening to audio and watching video.

(9) The sound source automatic identification function module is selected to synchronously record the sound source direction data, which is used to assist the manual review and judge the sound source type of exceeding the standard data.

Point location selection and installation requirements

Requirements for monitoring point setting

(1)  Number of monitoring points of the construction site

 The number of monitoring points is set according to the location of noise-sensitive buildings and sound sources around the construction site. The monitoring points are located in the positions that can reflect the greater impact of construction noise on noise-sensitive buildings. The position of the monitoring points can be adjusted along with the construction stage.

(2)  The site selection of the automatic noise monitoring points in the construction site shall meet the following requirements.

a.  It is set within the safe range of the construction area and can directly monitor the main construction activities on the site.

b.  If there are noise-sensitive buildings around, the automatic noise monitoring points can be set separately. Automatic noise monitoring points should be set up in the positions where construction noise has a great impact on noise-sensitive buildings.

c.  If there are no noise sensitive buildings around construction sites, noise monitoring points may not be set up.

d.  Strong electromagnetic interference is avoided near the noise monitoring point, and stable and reliable power supply is convenient for the installation and maintenance of communication lines.

e.  The setting of the noise monitoring points shall avoid the impact on the construction safety.

f. When adjacent to other construction sites, avoid setting up monitoring points at the adjacent boundaries.

(3)  Equipment installation and safety requirements

a.  The online equipment is firmly installed and, depending on the user?s own geographical location, should be able to withstand force 10 in general areas and force 12 in coastal areas.

b.  The outdoor microphone of the automatic noise monitor shall be 1 m outside the field boundary and 0.5 m higher than the wall, and the distance of the microphone shall not be less than 1.2 m from any other components.

c.  The insulation resistance between the inlet line of automatic monitoring equipment shall not be less than 20 MΩ.

d. With leakage protection device and anti-theft alarm device, to prevent personal electric shock and theft.

equipment list

Regulatory plan

(1) Low-noise construction equipment guidance catalogue

Promote low-noise construction equipment. To formulate a catalogue of prohibited and restricted use of housing construction and municipal infrastructure projects, and to restrict or prohibit backward construction techniques and equipment that are prone to noise pollution;

(2) Implement control responsibilities

The model text of the construction contract shall be revised to clarify the requirements of the responsibility and tasks and control of construction units and construction units. The construction unit shall compile and implement the work plan for noise pollution prevention and control, and adopt effective sound insulation and noise reduction equipment, facilities or construction technology. Encourage the classification and classification management of noise pollution prevention and control demonstration sites, and explore the construction enterprises to strengthen the prevention and control of noise pollution from the aspects of excellent evaluation and financial subsidies;

(3) strengthen supervision

 Strengthen supervision over construction, especially during night construction, holiday construction, automatic noise monitoring and early warning of major projects in residential areas, timely detect the disturbing situation, set up automatic noise monitoring facilities in accordance with relevant technical specifications, and connect to relevant regulatory departments.

In the construction site, the environmental noise automatic monitoring system with reasonable layout, advanced equipment, accurate data and stable operation, so as to realize the full coverage of online automatic monitoring of noise in construction. Through real-time monitoring of environmental noise data, the change law of noise emission change and the characteristics of noise emission intensity can be mastered. The environmental noise real-time data transmission to the monitoring command center, in order to the noise data analysis, statistics, query, grasp the noise emission change law and noise emission intensity characteristics to real-time reflect the construction site noise environment changes, and in the completion of construction site environmental noise daily monitoring and management at the same time by outdoor LED display to the society, through outdoor display to the public environmental quality and environmental protection propaganda, promote and strengthen the people?s participation in environmental protection and supervision. Thus fully protect the people?s right to know and encourage the public?s right to participate in protecting the environment.

Monitoring acoustic environmental quality at representative points of construction sites, Realize the automatic monitoring of environmental noise quality and noise source in construction sites, And establish an environmental noise information database, To realize the complex functions such as data analysis, processing and fusion of urban environmental noise pollution, Make various quality control tasks and standard transmission and other complex tasks to be automated execution and feedback; To build intelligent applications for leaders at all levels and in various scenarios, including comprehensive display, decision assistance, analysis and judgment, implementation, emergency response, monitoring and alarm, joint prevention and control, To realize the information and intelligent management of urban noise pollution emission, Provide technical basis for controlling environmental noise and improving acoustic environment quality, Effectively improve the level of construction site acoustic environment management. To provide modern technical support for creating a quiet and livable living environment.

stablish the mode of "online monitoring and alarm + offline accurate law enforcement" to realize automatic and fine supervision. Establish the information sharing mechanism of construction site monitoring data, noise network data and noise complaint data, To realize the synchronous information sharing and interconnection between ecological and environmental departments, construction departments, urban management departments and other departments, Help the construction noise fine management, precision law enforcement; The local government implements the responsibility of noise supervision, Set up a night construction noise complaint rapid processing center; The local ecological environment department shall be responsible for the supervision of the unapproved night (afternoon) construction and super decibel construction and other behaviors within its jurisdiction, Relying on the night construction noise complaint rapid processing center to explore the mode of "remote shout stop and offline supervision"; To persuade the construction sites that are ineffective, The local city administrative departments shall organize offline accurate law enforcement, We will achieve refined environmental supervision.

data sharing

Our company has a unified, open and easy to use monitoring cloud platform, and the data transmission is implemented in accordance with the data transmission standards of (HJ _ T + 212) pollutant online monitoring (monitoring) system-2017). Our noise online monitoring system can meet the requirements of various visual platform, monitoring cloud platform can actively push data to the relevant environmental protection bureau regulatory law enforcement platform, the epa regulatory enforcement platform can also actively from our front equipment monitoring data, or from our free open API interface for data, ensure the seamless docking data between equipment and platform.

Cloud platform of noise monitoring in acoustic functional areas

Our independent research and development of sound environment monitoring cloud platform, can realize the noise pollution sources monitoring real-time emission level monitoring at the same time, can automatically warning noise emission behavior, through the intelligent analysis of noise source characteristics, automatic linkage camera capture forensics, form excessive event alarm information, remind on the spot the noise subject to rectification, and notify the law enforcement and supervision departments to supervise the implementation. Through computer and mobile phone, the noise pollution emissions, video monitoring, excessive recording, excessive alarm, historical inquiry, on-site law enforcement and other functions, with on-site alarm, alarm push and other alarm notification, which provides a strong basis for noise data network management and real-time data analysis.