At 15:19 on June 12, the first bored pile for the enclosure structure of the intermediate ventilation shaft in the Hanyin section of Section 6111 of Shenzhen Metro Line 6 Phase II Project, constructed by the Third Company of China Railway Seventh Group, was successfully drilled, making it the first among the five construction units on the entire line to start pile foundation construction.

The intermediate ventilation shaft in the Hanlin Station to Yinhu Station section of Shenzhen Rail Transit Line 6 Phase II Project is located on the south side of Yinhu Mountain Park and the north side of Beihuan Avenue, with an irregular pentagonal structure. The main structure covers an area of 690.75 square meters, and the excavation depth of the ventilation shaft foundation pit is 15.8 meters. At the bottom of the foundation pit, there are two construction shafts, each 11.2 meters deep. The clear dimensions are 7.5 meters × 7 meters and 5.9 meters × 12.29 meters, respectively. The shaft body passes from top to bottom through complex strata including plain fill, hard plastic sandy clay, and completely, strongly, moderately, and slightly weathered layers. The foundation pit is constructed using the open-cut method, with bored cast-in-place piles for the enclosure structure, 600 mm diameter jet grouting piles between the piles for water stop, and reinforced concrete supports plus steel supports for internal bracing. This project has a total of 91 bored piles, using C35.P10 underwater concrete.

After more than a month of active preparation, the project department took the initiative, actively communicated with the owner, and various departments worked overtime around the preliminary work arrangements of the project, striving to advance land acquisition and demolition, water and electricity installation, material and equipment bidding, team selection, and preparation of preliminary construction plans. Following its achievement on April 26 of being the first unit to start construction within the section, the project department has once again made a breakthrough.