Media Monitoring

1.Media Monitoring Background

Media Monitoring is used to monitor the environment of subway projects and the possible deformation of surface and underground structures during construction.The subway is like an oxygen supplier for modern cities, supplying power and energy for the continuous development of the city. It can not only create wealth and business opportunities, but also lead the change of people's living lifestyle and create an era of subway cities. In recent years, subway accidents have continued to occur, and the total number of casualties has begun to increase significantly, with the curve showing a clear upward trend. The accidents reflect the insufficiency of safe construction monitoring technology and means, as well as the lack of construction safety management and supervision. The high technology content and high risk in subway construction all require a strong sense of safety, careful safety management and strict safety supervision to achieve. The subway project is largely a project that tests safety management. In order to keep abreast of the status of subway construction, give early warning of emergencies, maintain the safety of subway construction and social stability, and prevent tragedies like the Hangzhou subway collapse from happening again, the safety of subway construction is imminent.

2. Media Monitoring System Overview

Based on the close integration of technologies such as the Internet of Things, cloud computing and big data, and utilizing the innovative application of Internet+ in subway monitoring, a subway automated monitoring platform will be established to form a regional demonstration effect and open up a new era of automated monitoring of the entire subway line.

3. Main monitoring contents of Media Monitoring

1. Subway foundation pit: settlement and horizontal displacement of top of retaining piles (walls), deep horizontal displacement of retaining piles (walls), internal force of retaining piles (walls), deep horizontal displacement of soil outside the pit, axial force of anchor rods, groundwater level, axial force of support, uplift of pit bottom

2. Subway tunnel:

① Shield method: segment clearance convergence, segment structural stress

② Mining method: vault settlement and convergence, blasting vibration, vertical displacement of the center column structure, groundwater level

3. Surrounding risk sources: surface settlement, pipeline settlement, building tilt, uneven building settlement, building cracks, bridge pier tilt, uneven bridge pier settlement

IV. Media Monitoring Project List

5. Media Monitoring Basis

"Technical Specifications for Construction Monitoring of Urban Rail Transit Projects DG/TJ 08-2224-2017"

"Technical Specifications for Urban Rail Transit Engineering Monitoring GB50911-2013"

"Technical Specifications for Construction Foundation Pit Engineering Monitoring GB 50497-2009"

"Urban Rail Transit Engineering Survey Specification GBT50308-2017"

6. Media Monitoring Implementation Function

1. Online monitoring of subways during construction: Compare monitoring data with design values to determine whether construction technology and construction parameters meet expected requirements, predict possible dangers in advance and take necessary engineering measures to ensure smooth progress of the project and ensure construction quality and safety.

2. Online monitoring of subways during operation: Continuous and accurate monitoring of horizontal and vertical displacement of sections is achieved, so as to understand the deformation characteristics and laws of sections during operation and achieve the purpose of information monitoring. When the change value exceeds the preset value, an early warning can be issued in time.

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