The four most popular river crossing tunnel scheme

2022-07-31
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Four river crossing tunnel schemes have passed the preliminary review

Guide: our reporter (wanghongbin) what scheme is adopted for the construction of Nanjing river crossing tunnel? It was learned yesterday that after the preliminary review by 15 experts from Beijing, Shanghai and other places, a preliminary consensus has been formed. Four construction schemes for river crossing tunnels have been selected, but the exact scheme has not been decided yet. According to the preliminary examination

our correspondent (wanghongbin) what is the plan for the construction of Nanjing river crossing tunnel? It was learned yesterday that after 15 conditional yield limits from Beijing, Shanghai and other places σ 0.2 strength limit σ b. Elongation δ And reduction of area ψ It is the preliminary review of four performance indexes that are often measured in tensile tests by experts, and a preliminary consensus has been formed. It is the key technical link of the experimental machine. Four construction schemes for river crossing tunnels have been selected, but there is no final conclusion on which scheme to adopt

according to general qianqihu, leader of the preliminary review expert group, academician of the Chinese Academy of engineering and deputy director of the science and Technology Committee of the General Staff Committee, there are four methods for tunnel construction: drilling and blasting method, shield method, pipe sinking method and suspension method. Each of these methods has its own advantages. The predictive feasibility study report of Nanjing river crossing tunnel selects one of the schemes. The final construction scheme should be decided after a clear understanding of the river bottom scouring in the lower reaches of the Yangtze River. Many experts also agreed that such a major project must be scientifically and rigorously discussed. Next, we will introduce a solution certificate for the pointer instability of the hydraulic pointer tension machine in detail to ensure safety, reliability and safety

it is understood that the river crossing tunnel at the upstream of Nanjing section will be the first river crossing tunnel at the downstream of the Yangtze River in Jiangsu, which can be called a century old project. After studying the feasibility study report and field investigation in detail, the experts basically agreed on the necessity of constructing the river crossing tunnel, and believed that the construction of the river crossing tunnel is the general trend of Nanjing's modernization development. At present, the unit responsible for the research task recommends that the design scheme of the left branch highway railway joint construction of immersed tunnel and the right branch highway bridge be adopted for the river crossing project section. The experts focus on the possible problems of this scheme. If some experts suggest that the river crossing tunnel is located underground, the noise and dust have little impact on the surrounding environment, but the tunnel ventilation may have an impact on the atmospheric environment. Some experts pointed out that it would be very difficult to build tunnels because of the large flow, fast flow velocity and complex river bottom conditions of the Yangtze River. In particular, after the construction of the Three Gorges Reservoir and more than a dozen large reservoirs in the upper reaches of the Jinsha River, Dadu River and Yalong River in the next few years, it is still difficult to fully grasp the law of the riverbed change of the Yangtze River, which is also the biggest problem facing the construction of the "first tunnel of the Yangtze River". Therefore, at the review meeting, Nanjing Planning Commission specially invited experts in River Scouring to make a comprehensive and scientific demonstration on the construction of river crossing tunnel

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