Multi zone linkage fire extinguishing of shield tunneling machine, underground space fire protection plan

Description :

 As the core equipment of modern tunnel construction, shield tunneling machines are widely used in underground engineering construction such as urban subways, highway tunnels, and water conservancy tunnels. However, the risk of fire cannot be ignored when shield tunneling machines operate in enclosed and narrow tunnel spaces. Once a fire occurs, it not only causes equipment damage and delays in the construction schedule, but may also endanger the safety of construction personnel.

The fire risk points of shield tunneling machines are mainly concentrated in several key areas. The hydraulic system is a high-risk area, and shield tunneling machines are equipped with a large number of hydraulic equipment, including cutterhead drive hydraulic motors, propulsion hydraulic cylinders, pipe assembly machine hydraulic systems, etc. Hydraulic oil leakage can easily ignite when encountering high-temperature surfaces or electrical sparks. The electrical system includes the main drive motor, transformer, distribution cabinet, control cabinet, etc. Long term operation overload, short circuit, and poor contact can all cause electrical fires. The cutterhead drive system generates high temperatures due to friction with the rock and soil during excavation. If the cooling system fails or encounters flammable gases, it may cause a fire. The shield tail sealing system adopts grease sealing, and grease leakage may spontaneously ignite when exposed to high temperatures.

The particularity of tunnel construction environment exacerbates the risk of fire hazards. The shield tunneling machine operation area is located tens or even hundreds of meters underground, with enclosed space, limited ventilation, and narrow escape routes. After a fire occurs, it is difficult to exhaust smoke and evacuate personnel. At the same time, the electrical equipment inside the tunnel is dense, there are many combustibles, and the fire spreads quickly, making it difficult to extinguish.

The automatic fire extinguishing system is an effective means of fire protection for shield tunneling machines. The system adopts multiple technologies including temperature detection, smoke detection, and flame detection to monitor real-time temperature changes and smoke concentration in various areas. When an abnormality is detected, the system automatically alarms and activates the fire extinguishing device, without the need for manual intervention. The selection of fire extinguishing media should take into account the fire extinguishing efficiency and equipment protection: the hydraulic system uses foam or dry powder to extinguish the fire, and the oil surface is covered to isolate oxygen; The electrical cabinet uses clean gases such as heptafluoride or perfluorohexane, which have no residue and are non-conductive after extinguishing the fire; The cutterhead area uses fine water mist, which can both extinguish fires and cool down.

The automatic fire extinguishing system of shield tunneling machine should also have linkage function, which can automatically stop the machine, cut off the power supply, turn off the hydraulic pump, start the emergency lighting and smoke exhaust system in case of fire, and create conditions for personnel evacuation. The design of the system needs to consider the special characteristics of the tunnel environment, including explosion-proof requirements, protection levels, corrosion resistance, etc.

Shanghai Yican Intelligent Technology Co., Ltd. focuses on the research and development, production, and sales of industrial equipment automatic fire extinguishing systems. Its products cover multiple fields such as shield machine fire extinguishing systems, mining vehicle fire extinguishing devices, printing machine fire extinguishing equipment, CNC machine tool fire extinguishing systems, etc. The company has a technical team and a comprehensive service system, providing customers with one-stop services from scheme design, equipment selection, installation and commissioning to maintenance, helping enterprises achieve safe production.

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