After the shield starts, it passes through a number of complex buildings and structures.
on January 6, the downline of 9 Pa section of the fourth working area of the GFHD-1 section of the South Guangfo Ring Road safely crossed the Metro Line 8, and the downline of the 9 # working shaft Pazhou Station section of the Pearl River Delta Inter city Guangfo Ring Road (hereinafter referred to as the “9 Pa section”) contracted by the company safely crossed the Metro Line 8.
In this regard, the Project Department strengthened the safety technical disclosure, strictly controlled the risk sources of shield machine hoisting and launching, and controlled the settlement within 0.4 mm through the excavation of the test section, intelligent detection and other methods, which was far beyond the standard.
The second phase of Chengdu Metro Line 8 has a total length of 7.81 km.
After passing through Metro Line 8, it reaches Pazhou Station.
During the construction of the project, there are many problems such as the shield tunneling under the subway operation line, various types of municipal pipelines, complex geological and stratigraphic structures, and difficult settlement deformation control.
Source: At 9:00 a.m.
The construction is difficult and the safety risk is high.
In order to ensure that the shield machine can safely and smoothly cross the existing line, the project strictly implements the requirements of the company’s “six no moves” regulations, and strictly implements the following work: first, comprehensively overhaul and maintain the shield machine and supporting equipment that have been stopped for a long time to be connected; The second is to fully discuss the construction scheme of crossing the existing line and formulate detailed and accurate parameters and measures; Third, technical and safety disclosure covering all key positions and all staff; Fourth, conduct a comprehensive inspection of emergency plans, drills and material reserves; Fifth, actively respond to the acceptance requirements of conditions at all levels and earnestly carry out all work; Sixth, establish a joint commissioning and linkage mechanism for all parties involved in the construction, and the subway operation and ground protection, the construction unit, the supervision unit, the third-party monitoring unit and the company and the group company are on duty 24 hours a day; Seventh, the leadership led the team on site, aiming at the “three characteristics” of geological uncertainty, process variation and decision-making timeliness in shield tunneling, through “one link and one judgment” to achieve dynamic management, curb risks and ensure safe and continuous tunneling; Eighth, special personnel shall be arranged to analyze and report the data of automatic monitoring and surface monitoring.
Since the launch of the first shield on November 18, 2021, all the participants have worked hard for 13 months to successfully complete the 6674.973 m tunnel connection task.
There was no deformation warning in the process.
With the “Shen’an No.1” shield machine accurately reaching the receiving shaft, the section between Huangbeiling Station and Dongmen Road Station of China Railway Construction Southern Shenzhen Metro Line 5 West Extension Project was successfully completed, which is the first double line through shield section of the whole line.
The double track connection of the tunnel between Huangbeiling Station and Dongmen Road Station marks a major breakthrough in the project, opening a new journey for the construction of Metro Line 5, and laying a solid foundation for the connection of the whole line.
was completely completed on January 3.
The smooth progress of the shield machine is ensured, and the formed tunnel is solid inside and beautiful outside without leakage.
Qing’an post and group safety officer shall be set up to monitor, control and patrol at any time to achieve “zero accident” in safety production, ensure that the section successfully passes through major hazard sources such as Chengdu Chongqing Railway culverts and 8-strand railway tracks, and safely passes through 54 major risk sources such as the shield section of Line 17 under construction, pile foundation of Longtan Interchange, and old civilian houses along the line.
The down line of 9 Pazhou section is 3580m long and 22.6m deep.
In the face of problems such as water and electricity limitation caused by 60 years of rare high temperature and drought in Sichuan Province, and construction progress restricted by local epidemic prevention and control policies, the Project Department carefully organized and reversed the construction period, and ran out of the “acceleration” of project construction on the premise of ensuring safety and quality.
In order to ensure the smooth connection of the section, China Railway 14th Bureau Group has organized excellent troops and strong generals to plan ahead and scientifically deploy, invite experts to check the pulse and solve the construction problems, continuously optimize the plan and implement it accurately in the process, greatly improving the excavation efficiency and quality.
Actively allocate man, machine and materials, define the reward and punishment methods for node task assessment, press and compact the responsibility for safe production, and put 5 shield machines into simultaneous tunneling during peak hours to ensure efficient on-site construction.
Contact the new energy slag truck in advance for on-site transfer to improve the construction efficiency..
The section between Huangbeiling Station and Dongmen Road Station is located in the central business district, with dense underground pipelines and high-rise buildings.
The shield machine needs to pass through 110 kv pipe ditches, the anchorage area of the business center, five Class II and III risk sources, and be close to the existing subway lines for a long distance.
The project overcame another major risk source.
The Project Department has a wide range of construction sites, high construction risks and large quantities of work.
The project department’s construction scope includes Shengdeng Park Station, Shilidian Station to Shengdeng Park Station, Shengdeng Park Station to Longtan Interchange Station, Longtan Interchange Station to Longtansi Station, and Longtansi Station to Tongle Station.
Click the blue text above to follow us! The section between Huangbeiling Station and Dongmen Road Station of Shenzhen Metro Line 5 West Extension Project was successfully completed on January 6.
The number of risk sources crossed accounts for 50% of the whole line.
Actively mobilize the safety responsibility awareness of the team leader and team leader, carry out safety education and training for more than 40 times, fully cover the safety education and training of operators and all kinds of safety technical disclosure, and there is no dead end in safety control.
Adopt the method of optimizing the process and staggering the peak load to ensure the orderly construction on site.
The structural monitoring data of the existing line was deformed normally, and all indicators met the control requirements.
With the shield machine breaking through the rock, the section from Longtansi Station to Tongle Station of Chengdu Metro Line 8 Phase II Project undertaken by Urban Construction Branch of China Railway Shanghai Engineering Bureau was successfully completed.
The construction is difficult and risky, posing great challenges to the technical management personnel.
(Cheng Tao) Source: The 6675m tunnel of Chengdu Metro Line 8 Phase II Project of China Railway Tunnel Co., Ltd.
Through monitoring, the existing line structure shall be inspected, and the ground and pipeline shall be inspected continuously.
