Although only 235m long, the mountain tunnel under the Ha Long - Cam Pha coastal road project, Quang Ninh province is considered to be among the most difficult to construct among mountain tunnels in Vietnam. Currently, the contractor and construction units are accelerating the progress to complete the first tunnel through the mountain in Quang Ninh by the end of this year.
The entrance to the tunnel at the top of Cam Pha City. The tunnel item is a part of the Ha Long - Cam Pha seawall project, with a total investment of nearly VND 2,300 billion with 18.7 km long, 18m wide, including 6 lanes for motorized vehicles, was started in September 2019. However, the construction of the tunnel began in early 2021. Photo: Nguyen Hung
The entrance to the tunnel with the direction from Cam Pha to Ha Long.
Photo: Nguyen Hung
The tunnel through the mountain is located right on the shore of Ha Long Bay with an investment of nearly 250 billion VND, including 2 tunnels, 3 lanes each, tunnel width 13.795m. Currently, the work is in the stage of pouring concrete to leave the tunnel; Next comes the concreting of the tunnel surface, maintenance road, lighting and fire fighting system. Engineer Nguyen Duy Song - CEO of Deo Ca Group Joint Stock Company, the contractor for the construction of the tunnel - confirmed that he will complete the tunnel as committed to Quang Ninh province by the end of December 2021. Photo: Nguyen Hung
Workers were preparing the final stage to pour the concrete shell of the tunnel at the exit of the tunnel in Cam Pha area. Photo: Nguyen Hung
Prepare to pour the ceiling of the door into the tunnel from the direction of Ha Long to Cam Pha. Photo: Nguyen Hung
The entrance to the tunnel leads from Ha Long to Cam Pha. Initially, the tunnel through the mountains was not included in the project, but during the construction of the road, Quang Ninh province decided to add the tunnel, instead of having to break too many rocky mountains to pave the way - both unsafe for later traffic, and disrupting the environmental landscape. Photo: Nguyen Hung
The contractor organized the construction of 3 consecutive shifts day and night. Photo: Nguyen Hung
The contractor commits to complete the work by the end of 2021. Photo: Nguyen Hung
Although only 235m long, but the tunnel is curved due to road construction and then the tunnel is added. The opening of the road and then the addition of the tunnel makes the construction more difficult than other tunnel works, because in road opening projects, the road must follow the tunnel. Since the tunnel construction is more complicated, the tunnel opening location is always in the middle of the mountain. The tunnel through the mountains of the Ha Long - Cam Pha coastal road project is located on the mountainside, so the structure is not stable and solid; Not to mention the limestone area here has many caster caves. Many sections are located on the mountainside, so the cover (the length from the roof of the tunnel to the top of the mountain) is only about 40m, making the structure much weaker than the tunnel through the middle of the mountain. Photo: Nguyen Hung
Construction of waterproofing membrane before concreting the tunnel shell in the morning of October 18, 2021. Photo: Nguyen Hung
Construction progress is always guaranteed despite the complicated geology, the difficult transportation of materials and workers to Quang Ninh due to the COVID-19 pandemic. Photo: Nguyen Hung
The road to the tunnel in the territory of Ha Long city. The completion of the coastal road connecting Ha Long with Cam Pha City will open up a new development space for Quang Ninh province. Photo: Nguyen Hung
The contractor's representative talked about the construction progress of the mountain tunnel project.
BY NGUYEN HUNG
Nguồn: laodong.vn
