长距离顶管施工中管内环境保障技术研究  

Research on Internal Environmental Protection Technology for Long Distance Pipe-jacking Construction

作　　者：高志惠 罗利 周吉日 李彪 GAO Zhihui;LUO Li;ZHOU Jiri;LI Biao(China MCC5 Group Co.,Ltd.,Chengdu,Sichuan 610065,China;School of Geoscience and Technology,Southwest Petroleum University,Chengdu,Sichuan 610500,China)

机构地区：[1]中国五冶集团有限公司,四川成都610065 [2]西南石油大学地球科学与技术学院,四川成都610500

出　　处：《施工技术(中英文)》2025年第7期169-174,共6页Construction Technology

基　　金：国家自然科学基金面上项目(42277461);中国中冶重大研发项目(中冶科技[2023]5号-5)。

摘　　要：为了探究传统顶管作业时,压入式通风方式下有害气体的弥散规律,采用发烟装置于顶管作业现场掌子面进行了烟气扩散试验,分别对管内烟气弥散速度、管内及作业井内二氧化碳浓度场进行了测试与分析。试验结果表明:传统压入式通风运行模式下烟气以3.25m/s的速度扩散,烟雾以1.3m/s的速度在管道内形成弥散,一旦发生电气火灾或燃气等管线破裂事故人员难以有效撤离。研发了负压气封诱导式顶管作业环境保障系统,采用理论分析、模型试验等方法研究了其实施关键控制参数。研究结果表明:送风角度、送风速度以及出风口与掌子面距离对通风效果的影响依次降低,新系统可将有害气体降低到10%以下,对于有害气体泄漏事故15min内可将有害气体浓度降到安全值。To explore the dispersion law of harmful gases under the pressure ventilation mode in the traditional pipe jacking operation,the smoke diffusion test was carried out on the tunnel face of the pipe jacking operation site by using the smoke generating device.The smoke diffusion velocity in the pipe and the carbon dioxide concentration field in the pipe and the working well were tested and analyzed,respectively.The test results indicate that under the traditional press-in ventilation operation mode,the smoke diffuses at a speed of 3.25m/s and the smoke diffuses in the pipeline at a speed of 1.3m/s.Once an electrical fire or gas pipeline rupture accident occurs,it is difficult for personnel to effectively evacuate.A negative pressure gas seal induced pipe jacking operation environment protection system was developed,and its key control parameters were studied by theoretical analysis and model testing.The results indicate that the influence of air supply angle,air supply speed,and the distance between air outlet and tunnel face on ventilation effect decreases in turn.The new system can reduce harmful gas to less than 10%,and for harmful gas leakage accidents,the concentration of harmful gas can be reduced to a safe value within 15minutes.

关 键 词：顶管 有害气体 弥散速度 负压气封 试验 

分 类 号：TU990.3[建筑科学—市政工程]