Transportation
Heavy news! China's first longest cross-sea high-speed rail tunnel runs through
Seetao 2021-04-16 10:00
  • The Yangmeishan Tunnel, the longest tunnel on the Fuxia High-speed Railway line, with a total length of 10,669 meters
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On April 15, 2021, China’s first cross-sea high-speed rail was undertaken by China Railway 12th Bureau Group. The Yangmeishan Tunnel, the longest tunnel on the Fuzhou-Xiamen High-speed Railway with a total length of 10,669 meters, broke through the bottleneck in the construction of the entire line.

Intelligent equipment runs through the tunnel

As a key controlled high-risk tunnel on the entire line, the Yangmeishan Tunnel is located in the coastal mountainous area of Fujian with a maximum buried depth of 398 meters, which is equivalent to passing through a 100-story super high-rise building. Rockburst and high geothermal problems exist. The rockburst section has a total length of 2290 meters and is dense. The criss-crossing of geological faults will cause stratum collapse with a slight disturbance.

The visualized advanced horizontal drilling can quickly and accurately explore the front geological structure, upload the survey results simultaneously, and send instructions after processing through the information-based intelligent management platform. The three-arm rock drilling rig can drill accurately according to the instructions, and the hydraulic smooth blasting can accurately blast the average The drilling time is shortened by 30 minutes. Visualize advanced drilling as a “gastroscope” for the strata. To improve the drilling accuracy of the three-arm rock drilling rig, the builders developed the technology of “drilling and bending rod drilling” to effectively enhance the flexibility of the three-arm rock drilling rig’s drill pipe and achieve mastery Boreholes in the blind area are fully covered, and different geological drilling depths are accurately controlled, and the best charge blasting effect has been achieved.

The amount of explosives used for hydraulic smooth blasting on the tunnel face is controlled to gram to achieve weak blasting, avoiding the severe vibration of extensive blasting, and effectively reducing the risk of rock blasting. The blasting over-excavation is controlled within 10 mm, and the consumption of lining concrete is significantly reduced. In order to adapt large-scale machinery and equipment to special geological conditions to improve engineering safety and quality, the builders carried out technological innovation and innovation around machinery and equipment, and built a complete new tooling process system from tunnel excavation to maintenance.

The mobile control blasting protective cover technology was applied in the excavation construction, the steel "golden bell" was used to build a hydraulic inverted arch trestle with escape passages, and the lining spray maintenance trolley was improved to realize the automatic intelligent maintenance of the tunnel. The construction of catenary and gutter cable troughs adopts the catenary pillar and anchor cable positioning technology, the pre-embedded technology of the catenary trough, the movable formwork of the gutter cable trough, and eliminates the problem of concrete honeycomb pitted surface. The construction cycle is only 1 day per cycle. , The construction efficiency has been increased by more than 3 times compared with the previous, and a standardized tunnel excavation system has been established.

Mechanized equipment + "smart brain" to command the "corps" remote operations without leaving home, Yangmeishan tunnel machinery and equipment are fully integrated into the information-based intelligent management platform, management personnel can remotely command without leaving home, Yangmeishan tunnel entrance and exit, etc. 6 The construction of the working surface has realized the "point-pointing" digital precision construction. Fully computerized three-arm rock drilling rig, self-propelled invert hydraulic trestle, intelligent pouring of the second lining formwork rig, temperature-controlled automatic spray maintenance platform, constitute a mechanized construction operation line, and establish a site by connecting to an information-based intelligent management platform The perception module forms a construction management model of "mechanization + smart brain".

The smart management platform adopts a comprehensive construction monitoring and management system in the form of "cloud + terminal". Managers can check on-site construction conditions at any time through mobile clients such as mobile phones, simultaneously issue construction instructions, and direct the tunnel machinery "big corps" group operations.Editor/Xing Wentao

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