The first two-mode shield tunnel to complete the mode transformation in the tunnel is fully connected

The first dual-mode shield tunnel with mode conversion completed in China and the only dual-mode shield tunnel of PowerChina -- the shield tunnel tunnel between Huide Station and Fuyong Station of Shenzhen Metro Line 12 (hereinafter referred to as "Huaifu tunnel") successfully achieved the completion goal, which marked the complete completion of the shield tunnel of civil construction area 6 of Shenzhen Metro Line 12.

The tunnel between Huide Station and Fuyong Station is located in Baoan District, and the environment of the tunnel is complicated. It runs through mountains and many house pipelines. The area starts from The Huide station, along the South Huide Road, through the Wangniuting Mountain, and then along the Fuzhou Avenue to the Fuyong station. The right line is 1716 meters long, and the right line is 1130 meters long through the breeze granite with hardness of more than 120 mpa.

In the face of the construction problem of dual-mode shield machine driving in complex stratum, the company actively integrates the existing human, machine, material and other resources in the construction site, and follows the guiding principle of "overall planning, balanced production, priority first, piecewise organization, highlighting difficulties and orderly promotion" in the construction organization. In the early stage of construction, the company hired experts to carry out scientific demonstration of the construction scheme for many times to ensure the applicability of the construction technology and equipment. During the construction process, the excavation analysis meeting should be held every day to timely analyze the excavation data of the day, adjust the excavation parameters and advance scientifically. And through the field organization of party members vanguard post, youth commandos continuous operation, to ensure the smooth progress of the construction.

In order to make the dual-mode shield more in line with the site construction demand, the company actively adopt the improvement of cutter opening rate, add advanced drilling system in the hole, add domestic advanced tool online monitoring system, improve the center belt rotary system and other measures. In order to solve the dust problem during TBM tunneling, the shield machine is also equipped with an integrated dust extraction system, and a compressible soft air pipe is set in the drive box to send fresh air to the earth bin in time and pump the dust to the dust extraction machine, forming a microcirculation, and providing a comfortable construction environment for the construction workers.

The successful completion of the two lines of huaifu double-mode shield tunnel once again laid the foundation for the scheduled operation of Shenzhen Metro Line 12 in 2022.