In June 2018, commissioned by China Communications Tunnel Engineering Co., Ltd., our equipment L20-N undertook the monitoring of the impact of the drilling and blasting vibration of the Yuexi Tunnel in the Zhangmu section of the Chengdu-Kunming Railway on the adjacent railways. At 800 meters from the tunnel entrance, there is no mobile phone signal coverage in this area. With the support of wired relay, the remote detection blasting vibration of the Internet is realized.
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