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China Infrastructure News (written by Jiang Deyan and photographed by Xie Zhenwei).Recently, Fengjian high-speed TJ09 work area Xiaoying tunnel Fengjie end inclined shaft air supply main tunnel smoothly excavated to the demarcation mileage, after the completion of the construction task of the underground fan room and the contact air duct, Xiaoying tunnel inclined shaft Fengjie end double hole will achieve the penetration with the main tunnel, will vigorously improve the ventilation effect of the entrance of the Xiaoying tunnel.
Xiaoying extra-long tunnel Fengjie end inclined well is located at the junction of Wushan County and Hubei Jianshi County, with less sunshine, high humidity, rainy autumn and summer, foggy winter and spring, large longitudinal terrain undulations, steep terrain, net width of 85 meters, clear height 665 meters, the maximum longitudinal slope is 15%, and it is transported tracklessly.
The working principle of the tunnel ventilation shaft is to use the airflow difference between the shaft and the tunnel to introduce fresh air into the tunnel through natural ventilation or mechanical ventilation, and discharge the dirty air out of the shaft, so as to ensure the air circulation and freshness in the tunnel. Its main function is to replace and purify the air flow in the tunnel during the operation and construction stage, effectively reduce the concentration of harmful gases and dust content during the construction process, and ensure the safety of personnel and equipment in the tunnel.
Since the start of construction, the project department of Fengjian Expressway TJ09 work area will "grasp with both hands, do not make mistakes", take safety goals as the guide, scientifically organize construction, and fine management. On October 8, 2022, the construction of the Fengjieduan inclined shaft of the Xiaoying extra-long tunnel officially started, of which the air supply is 1,843 meters long and the exhaust air is 1,859 meters long.
In terms of safety, the project has increased investment in mechanization and information equipment, and leveraged 5G new technology in tunnel construction to achieve real-time monitoring and unified centralized rapid management. On the other hand, the project department set up a commando team to take root at the site in a timely manner, observe the geological changes in real time, and took a series of construction measures for different bad geology to reduce the construction safety risk, and the Fengjieduan inclined shaft of Xiaoying Tunnel achieved the goal of "zero accident" in safe production.
In terms of progress, the project department reasonably arranges the construction process, strengthens the optimization of construction organization, strengthens the maintenance and daily inspection of machinery and equipment, and reduces the failure of construction equipment. The time of each process is assessed, and the principle of "people waiting for the process, the process is not waiting for people" is always adhered to, so as to reduce the process connection time and affect the construction progress, and efficiently promote the on-site construction progress.
In terms of cost control, the project department strictly grasps each process in the excavation process, appropriately adjusts the method and quantity of drilling and charging according to the surrounding rock situation on site, combined with monitoring and measurement data, and adopts the most effective construction method to ensure that the over-under-excavation control work is done. On the other hand, under the premise of quality and quantity, strictly control the use of materials, establish a recyclable material ledger, conduct a weekly inventory of recyclable materials, and analyze the statistics of material overconsumption.
Next, the project department gave full play to the leading role of party building, and used party member demonstration posts, party member commandos, and party member responsibility areas to carry out standardized position construction, and at the same time used places such as "migrant workers' night school, safety experience hall, and information management" to further enhance the safety awareness of front-line operators and effectively integrate party building into production. Ideologically, firmly establish the idea of "safety first, quality first", always practice the work concept of "high standards, science, and unremitting slackness", conscientiously grasp the construction organization of heavy projects, strengthen process control and on-site management, strengthen the standardization, mechanization and information management of tunnel construction, and ensure that the high-quality construction of the project creates benefits for the company.