Shanghai Tianhao Industrial Co., Ltd. has signed a strategic cooperation agreement with Shaanxi Construction Steel Structure Co., Ltd. in Xi 'an on July 1, 2021.

On July 21, with the "Dongfang No.2" shield tunneling machine breaking out of the rock at Laoshan No.6 Middle Station, the shield tunneling on the left line between Shazikou Station and Laoshan No.6 Middle Station of Qingdao Metro Line 4 received the tunneling smoothly, and the Shilao section of Line 4 was successfully completed.