China's most great wall railway subsea shield tunnel successfully crosses the artificial island
发布时间：2021-04-14 点击数：235
On August 29, the left line shield machine "Shenwan No.2" of the front section project of Guangzhou Dongguan deep machine, the most great wall railway subsea shield tunnel in China undertaken by China Railway 14th Bureau, successfully crossed the artificial island of the deep middle channel, marking the successful completion of the double line shield of the project and the major risk source of the penetration.
The front section of Guangzhou Dongguan deep Machinery Co., Ltd. is a double hole single line shield tunnel, constructed by two large-diameter mud water balance shield machines, which is the longest single head tunneling distance and the only tunnel crossing the sea area. In the process of shield tunneling through the deep channel of Shenzhen Xiwan sea area, it is necessary to excavate in the upper soft and lower hard composite stratum and granite hard rock stratum, which is a major risk, and it is easy to cause stratum settlement and mechanical failure.
The front section of Guangzhou Dongguan deep Machinery Co., Ltd. is a double hole single line shield tunnel, constructed by two large-diameter mud water balance shield machines, which is the longest single head tunneling distance and the only tunnel crossing the sea area. In the process of shield tunneling through the deep channel of Shenzhen Xiwan sea area, it is necessary to excavate in the upper soft and lower hard composite stratum and granite hard rock stratum, which is a major risk, and it is easy to cause stratum settlement and mechanical failure.
In order to ensure the successful completion of the shield tunneling through the deep and medium channel, in view of the problem that the cutting tools are easy to wear in hard rock strata, and in order to ensure the efficient and continuous tunneling of the shield, before the shield tunneling through the artificial island on the left line, comprehensively check the geological conditions of the tunnel underpass section, combine the changes in the soft and hard proportion of the stratum, use the advanced grouting technology to strengthen the soil mass of the upper soft and lower hard stratum, comprehensively improve the safety pre control measures, and strengthen the process supervision, At the same time, make adequate emergency preparations. The project summarizes the previous tunneling experience, organizes the establishment of a tool database, optimizes the tools of the project, reduces the abnormal damage of the tools, greatly improves the service life of the tools, and ensures the efficient tunneling of the shield.
In the process of tunneling, the whole project works together to strictly control the tunneling parameters, reasonably adjust the shield posture, pay close attention to the grouting pressure, strictly implement the ground monitoring, ensure real-time ground monitoring, quickly adjust the tunneling parameters, and strictly control the impact on the island and ground buildings. It took 65 days and successfully completed the 205 meter penetration task.
In the process of tunneling, the whole project works together to strictly control the tunneling parameters, reasonably adjust the shield posture, pay close attention to the grouting pressure, strictly implement the ground monitoring, ensure real-time ground monitoring, quickly adjust the tunneling parameters, and strictly control the impact on the island and ground buildings. It took 65 days and successfully completed the 205 meter penetration task.
The front section of the Guangzhou Dongguan Shenzhen intercity railway is an important link of the Guangzhou Dongguan Shenzhen intercity railway. It is planned to be completed and opened at the end of 2024. At that time, the intercity motor train will go directly to Qianhai and Bao'an center, which is of great significance for improving the intercity network of Guangdong, Hong Kong and Macao Bay area and realizing the regional economic integration development.