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Underground Integrated Utility Tunnel Area Control Unit ACU
Release date:
2020-05-18
The function of the environmental and equipment monitoring system is to achieve comprehensive, real-time monitoring of environmental parameters and equipment status throughout the entire integrated utility tunnel. It ensures that real-time monitoring data is accurately and promptly transmitted via multi-functional integrated control stations to the unified management information platform at the monitoring center, enabling on-duty personnel to quickly identify on-site environmental and equipment issues, promptly address malfunctions, and efficiently handle emergency alerts, thereby guaranteeing the normal operation of the tunnel.
The tunnel environment and equipment monitoring system typically features an ACU area controller every 200 meters, provided by Aote. Technology Independently developed PLC controllers, resulting in the creation of multiple specialized regional controllers tailored for utility tunnels.
Feature Introduction
Environmental Monitoring >>>
The environmental and equipment monitoring subsystem detects and triggers alarms for environmental parameters within the utility tunnel. The environmental parameter detection details are outlined in the table below, and the gas alarm thresholds are set in accordance with the relevant provisions of the national standard GBZ/T 205, "Occupational Health Protection Guidelines for Work in Confined Spaces."
According to regulatory requirements, one personnel escape safety hole, one material inlet, one ventilation opening, one fireproof door, and one entrance/exit point for personnel should be provided every 200 meters along the length of the pipe gallery.
By installing gas (O2, CH4, H2S), temperature, humidity, smoke, water level, and water-logging monitoring sensors at entrances, exits, and ventilation points within each fire compartment, automated control and integration with fans and pumps can be achieved. Detection signals are transmitted locally to the integrated control zone station and then sent via Ethernet to the monitoring center’s computer. In the monitoring center’s control room, data such as gas levels (O2, CH4, H2S), temperature, humidity, smoke, and water levels for each fire compartment are displayed digitally on the screen.
As required by the "Technical Code for Urban Municipal Utility Tunnels":
Each comprehensive utility tunnel fire compartment is designed with a set of environmental monitoring systems, including:
> 2 temperature and humidity sensors, 1 water level sensor, 2 oxygen sensors, 2 hydrogen sulfide sensors, 2 methane sensors, with integrated display function;
> Temperature, humidity, oxygen, hydrogen sulfide, and methane sensors are installed near both sides of the fire door (close to the area where people enter and exit);
>The water level sensor is installed in the sump, and the assembly directly powers the display unit;
>4 settlement monitoring sensors, featuring a standard Modbus RTU interface.
The connection diagram for the environmental and equipment monitoring subsystem is as follows:
Equipment Monitoring >>>
Data is collected from instruments and equipment such as drainage pumps, lighting systems, fans, air duct valves, infrared intrusion alarm devices, and environmental temperature, humidity, and oxygen detection meters installed within each fire compartment. The system monitors the upper-level liquid level alarm signal in the sump pit and transmits this information via the corresponding multi-functional integrated control zone station to the unified information management platform. At the same time, the multi-functional integrated control zone station receives commands from the monitoring center, enabling remote control of fan start/stop operations as well as the activation/deactivation of lighting equipment in the respective fire compartments.
The equipment monitoring connection diagram is as follows:
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Company Headquarters: No. 15, Building B, Zone B, Phase I, Headquarters Economic Park, 69 Fengzhan Road, Yuhuatai District, Nanjing, Jiangsu, P.R. China
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