Zhanjiang bay undersea tunnel 330 tons heavy shield machine cutter head smoothly down well

On June 17, at 9 am 22 points, in zhanjiang bay tunnel project construction site, "yongxing date" of shield machine cutter head start "in", after a tense hoisting operation, under the huge shield cutter head smooth lifting Wells, marked the shield unit work phased victory, to open in the sea next trip to lay a solid foundation.

Yongxing shield tunneling machine is divided into three parts: cutter head, shield body and back supporting system. The excavation diameter is 14.33 meters, the total length is 147 meters, and the total weight is 3,600 tons. The cutter head opening rate is 45%, and it mainly undertakes the construction and excavation task of Zhanjiang Bay Undersea Tunnel. The total weight of the cutter head of the shield machine is 330 tons. On the ground, it is carefully welded by 6 main arms, 6 auxiliary arms and the center block. Each part must be accurately measured and positioned for many times. Cutterhead hoisting has the characteristics of self-weight, large rotation range, narrow site and great difficulty in operation. It is the key link in the hoisting operation of the shield machine, as well as a procedure with the highest difficulty and greatest risk coefficient in the hoisting process.

The steel dragon has "sharp teeth". With the cooperation of two crawler cranes of 450 tons and 300 tons respectively, the cutter head of the shield machine hoisting in the well this time rises from the ground, and after the completion of the "turning over" action, the cutter head of the shield machine is slowly "upright". After adjusting the orientation, the cutter head of the shield machine is safely and accurately hoisting into the bottom of the original well about 27 meters deep.

According to the introduction, in the cutter head hoisting down the well positioning installation, the construction personnel will carry out pipeline connection, commissioning and other follow-up work.

Zhanjiang Bay Subsea Tunnel, with a total length of 9,640 meters, is a key control project of Guangzhou-Zhanjiang High-speed Railway. It is the longest large-diameter sea-crossing high-speed railway shield tunnel excavated alone in China at present. Opening wide cham high-speed rail will implement the guangzhou city center to the center of zhanjiang city 90 minutes of each other, in strengthening the guangdong foreign cooperation "between home on land or sea, two-way each other aid" play an important leading role in development, to increase economic status of west area, construction of zhanjiang provincial deputy center city, the beibu bay center city and modernization important growth pole of coastal economic belt, Upgrading and optimizing the layout of transportation will play an important role in promoting it.