The south exit of the Daqingshui Tunnel on the Suhua Highway on Taiwan’s Line 9 was completed at 5:00 pm on January 15. The slope reinforcement and steel scaffolding are scheduled to be completed by the end of April this year.

(Provided by the General Directorate of Highways)

[Reporter Chen Xinyu/Taipei Report] The south entrance of the Daqingshui Tunnel on the Suhua Highway on Taiwan’s Line 9 collapsed on January 11 and was subsequently cleared. Restart the control and continue to reinforce the project. From 8:00 am on February 1st to 12:00 noon on February 24th, 15 minutes will be released every hour from 8:00 am to 9:00 pm every day, and there will be no construction control on holidays.

The General Administration of Highways stated that the Daqingshuiming Tunnel (159.3k) on Suhua Road Langtai Line 9 (159.3k) will handle the construction of the upper slope protection, and the section from Heren to Chongde will be under construction control. Look at the condition of the slope and the alert of the two traffic control personnel. Please use passers-by to drive carefully and cooperate with the on-site personnel to pass in order.

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The General Administration of Highways stated that since the concrete exposed tunnels of the Daqingshui Tunnel have been completely crushed, the upper slope is still in an unstable and high-risk state, and rockfall is prone to occur during earthquakes and rains. The exposed steel tunnels will be connected and reconstructed. The 2.5-meter exposed steel tunnel will be reconstructed together. The original steel exposed tunnel was designed to withstand the impact force of about 5t/m2 of falling rocks. The disaster caused local deformation and buckling of the steel columns near the mountain side. The reconstructed steel exposed tunnel will be Increase the reinforcement of beams to increase the bearing capacity of the overall structure. Since the construction period of the steel structure tunnel is 8 months, before the completion of the steel structure tunnel, the slope reinforcement and steel scaffolding will be carried out first, and it is scheduled for the end of April this year. Completed before, to improve the rockfall protection function.

The General Administration of Highways pointed out that before the Spring Festival holiday, the cracks on the rock surface of the upper slope and the spraying of the slope surface were opened to traffic around the clock. After the false dredging, comprehensive slope protection with sprayed concrete will be implemented.

The General Administration of Highways stated that after the huge rockfall at the south entrance of the Daqingshui Tunnel on the Suhua Highway collapsed, 3D modeling and analysis of the scope of the collapse were carried out through drone aerial photography, resulting in the collapse of the slope above the exposed tunnel. More than 100 tons of rock blocks were peeled off, which exceeded the bearing capacity of the open tunnel structure. The 17-meter-long concrete open tunnel adjacent to the Daqingshui Tunnel was completely crushed, and the adjacent steel structure open tunnel was 2.5 meters long.

The General Administration of Highways stated that Taiwan Shixi Engineering Consulting Team judged that the landslides were mainly marble rocks. This area is a geologically sensitive area for landslides and landslides. The rock mass decompression joints developed above the Ming Tunnel. The cause of the disaster was the recent earthquake loosening and rainfall. , resulting in the collapse of the rock mass caused by decompression and cracking of the rock mass joints on the cliff above the open tunnel.