Design And Implementation Of Dust On-line Monitoring System For Construction Site

With the rapid development of urbanisation in our country and the vigorous promotion of urban infrastructure optimisation and construction,the government is paying more and more attention to the problem of dust pollution at construction sites and the protection of the environment and dust pollution prevention.Various national and local laws,regulations and standards have been issued one after another,putting forward higher requirements for dust monitoring.There is an urgent need for government regulatory authorities to carry out informatization,automation and fine-grained supervision of dust monitoring.This paper uses IoT online monitoring technology,based on GPRS/3G/4G/5G networks,to build an online monitoring system for dust at construction sites,realizing online monitoring,real-time alarm,visual monitoring,assessment and evaluation,process collaboration and other information,automation and refinement of dust monitoring supervision.The system provides rich management functions for the user side.In response to the low efficiency of previous paper or form-based filing and auditing of projects,equipment,etc.,the system provides online processes for unit registration,project,dust point and video point information declaration and auditing.In order to facilitate remote visual supervision,video monitoring real-time viewing,PTZ control and historical playback functions are provided for supervisory users.In order to facilitate quickly tracing of pollution causes,data exceeding the standard linkage camera capture and deposition functions are provided.In order to facilitate the monitoring of dust on the whole site,a "dust map" based on GIS(Geographic Information System)is built for projects,dust points and video points,with different colored icons in the map to show the dust pollution situation,so that the pollution situation can be mastered globally.In order to improve monitoring and collaboration efficiency,the system provides equipment offline reminders,data exceeding alarms,data falsification identification,and message push functions.To facilitate assessment and evaluation of construction sites,functions such as horizontal and vertical comparison and analysis according to time,project and monitoring point dimensions,monthly reports,quarterly reports and dust assessment are provided.These functions simplify the user’s daily management and improve efficiency,while providing decision-making basis for dust pollution control.The system focuses on solving the networking problem of different manufacturers’ dust monitoring device on the device side using private protocols to access the unified online monitoring system.For the problem of different protocol instructions of private protocols,a common network communication protocol description language is designed to unify and standardize the description of each private protocol instruction into a protocol dictionary.Dynamic coding and decoding based on the common description language of communication protocols,loading multiple protocol description language files and dynamically matching,encoding and decoding data messages according to the protocol description files during the sending and receiving of communication messages.This technique eliminates the need for "hard-coded" custom development for each private protocol,provides better maintainability and greater reuse value,and can be applied to a wide range of IoT protocol communication coding and decoding.The construction site dust online monitoring system is built using Java language,Spring,Spring MVC architecture,Hibernate,Mybatis and Oracle database.Using the front-end and back-end separation scheme and Ajax technology,it provides reusable service support for web and mobile apps.The system has the characteristics of scalable,high-performance,and big data storage.The innovation points of this paper:1.In order to solve the problem of unified access to each manufacturer’s private protocol dust monitoring device,a common description language for communication protocols is designed to describe each private protocol command in a unified format,and the communication system is designed to dynamically encode and decode the messages.The online monitoring system supports simultaneous communication with various private protocol devices at the same time.This technology is more versatile,maintainable and has greater reuse value than the "hard-coded decoding and communication for each manufacturer’s private protocol" solution.2.In view of the difficulty of remote evidence collection for dust exceeding the standard and the slow traceability of pollution causes,the system uses cameras to remotely and automatically capture evidence,and the dust data exceeds the standard and is linked to the camera to capture and save,which is convenient for the construction site to trace the cause of pollution.3.In view of the phenomenon of data falsification or data distortion of some construction site dust monitoring devices,it is difficult to identify manually or the identification efficiency is extremely low.The system monitors and alerts on abnormal dust conditions at construction sites and identifies falsified and distorted data automatically,ensuring the quality of dust monitoring data and improving supervision efficiency.