行业：隧道地铁

Gas Monitoring Solution for Tunnel and Subway Construction and Operation

A dual-stage plan encompassing both the construction and operational phases, integrated with the ventilation system, involves setting up monitoring points every 100 meters

行业痛点

隧道地铁分施工期 + 运营期两阶段，气体风险完全不同：施工期穿越含瓦斯地层（CH4 突涌）、爆破产生 CO + NO2 + 粉尘、燃油机械废气 CO 累积、深基坑缺氧（O2 < 19.5%）；运营期车辆尾气积累（CO + NO2 + PM2.5）、变电所 SF6 泄漏、地下管线（燃气 / 污水）邻近泄漏入侵、火灾应急烟雾。盾构机舱内、TBM 控制室、隧道竖井、地铁车站换乘通道、设备机房、紧急疏散通道都是风险盲区。一次气体相关事故（如 2018 年某地铁施工瓦斯爆燃）后果极严重 — 人员伤亡 + 工期延误 + 千万级整改。

方案概述

优锐安提供”施工期 + 运营期”双阶段隧道地铁监测方案：① **施工期**：盾构 / TBM 设备前舱搭载固定 CH4 + CO + O2 + H2S 探头（必须防爆 Ex d IIB T4），开挖面安装移动式甲烷激光遥测仪（实时扫描 100m 远的瓦斯涌出），爆破前后用便携 4 合一作业前确认；竖井 / 横通道部署气体监测分站联接 PLC 控制通风。② **运营期**：车站新风系统入口 + 站台层 + 站厅层 + 变电所 + 设备区分布式 CO + NO2 + LEL 探头，变电所专项 SF6 监测，火灾时联动消防排烟系统。③ 全线接入 BAS / 综合监控平台，实现”检测 → 联动通风 → 触发疏散 → 短信通知应急队”闭环。布点严格按 GB 50157 + GB 51298 标准。

## Key Locations for Monitoring During the Construction Period

– **Front cabin of shield machine / TBM**: CH4 + O2 dual-parameter (explosion-proof gas layer)
– **Excavation face**: laser methane telemetry (non-contact scanning, extending up to 100m)
– **Shaft bottom / Cross passage**: CO + LEL + O2 + CO2 + Wind speed
– **Concrete mixing plant / Shotcrete and rock bolting area**: dust + CO
– **Operator**: Manually portable 4-in-1 (CH4 + CO + O2 + H2S) + infrared thermal imaging

## Key Locations for Operation Period

– **Station fresh air shaft entrance**: CO (preventing exhaust gas backflow) + PM2.5
– **Platform / Station Concourse**: CO + NO2 + CO2 (CO2 accumulation when personnel density is high)
– **Vehicle depot/maintenance workshop**: CH4 (hydrogen gas evolution during early thermal runaway of on-board batteries, H2 accumulation in VRLA batteries) + CO
– **35kV substation / traction substation**: SF6 + O2
– **Evacuation route / Emergency exit**: Fire smoke + CO linkage

## Key Technical Parameters

– Explosion-proof: During the construction period, it meets the requirements of Ex d IIB T4 (GB 3836)
– Protection: IP66 – IP67 (underground high humidity)
– Communication: RS485 + Modbus / CAN, BAS integration
– Range: CH4 0-100% LEL / CO 0-1000 ppm / NO2 0-50 ppm / SF6 0-1000 ppm

## Implementation Essentials

1. **Combined ventilation during construction**: When CH4 concentration is ≥ 0.5%, increase the air volume of the local fan; when it exceeds 1.5%, immediately stop work and evacuate personnel
2. **CO linkage during operation**: When the CO concentration in the station hall exceeds 30 ppm, initiate emergency ventilation
3. **Fire linkage**: Smoke detection + CO triggered simultaneously → Initiate mechanical smoke extraction + Fire shutter + Broadcast evacuation
4. **Personnel location tracking during construction**: UWB positioning + automatic positioning alarm for gas overrun, facilitating evacuation and personnel search

## Regulatory Basis

– GB 50157-2013 “Code for Design of Metro”
– GB 51298-2018 “Fire Prevention Standard for Metro Design”
– JTG D70-2-2014 “Design Specifications for Highway Tunnels”
– TB 10003-2016 “Code for Design of Railway Tunnel”
– Technical Code for Gas Prevention and Control in Underground Engineering (TB 10120-2019)

## Applicable Customers

Subway construction entities (Beijing, Shanghai, Shenzhen, Guangzhou, Chengdu, Wuhan, Hangzhou, and other subway groups); general contractors for highway/railway tunnel construction (China Railway Group / China Communications Construction Company); operation companies (subway operation, highway groups); ultra-long highway tunnels, cross-sea tunnels, pumped storage water diversion tunnels.