The hottest pump is the first tunnel of the Yangtz

2022-10-14
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Introduction: Wuhan Yangtze River tunnel is currently the most complicated geological condition in China, with the highest engineering technology content, and the construction of longmang Baili extending upstream is not only the most difficult river tunnel project. In the process of excavating this river tunnel, Chinese engineers and technicians have successfully overcome the worldwide construction technical problems related to graphene patents accumulated by wu3star, apple, Google and Huawei. The geological conditions at the bottom of the Yangtze River in Wuhan

Wuhan Yangtze River tunnel is the most complicated geological condition, the highest engineering technology content and the most difficult construction tunnel project under the river in China at present. In the process of excavating this river tunnel, Chinese engineers and technicians have successfully overcome five world-wide construction technical problems

the geological conditions at the bottom of the Yangtze River in Wuhan are complex, including 13 kinds of surrounding rocks such as clay, silt, silty fine sand, pebble, and rock stratum. Its soft upper and hard lower stratum structure is the "natural enemy" of tunnel excavation. Almost every construction stage of Wuhan Yangtze River tunnel excavation is accompanied by the tackling of world-class technical problems

the construction of Wuhan Yangtze River tunnel must be carried out in the central urban area with dense flood control facilities and numerous urban buildings, which also determines the worldwide nature of these problems. The five major problems are: first, attitude control. When the shield machine passes through the geology where the soft and hard are uneven and the screw holes of each foot are poured with high-strength cement mortar, the tunneling attitude is difficult to control; The second is the high water pressure. The tunnel is 57 meters deep from the water surface to the bottom. The pressure of the river water is great, and preventing the tunnel from being permeable is the biggest difficulty; Third, it is extremely shallow. In some sections, the shield machine is only 5 to 6 meters away from the ground. It is extremely difficult not to "disturb" ground buildings and cross the Yangtze River Levee; Fourth, it is strongly permeable. Most of the two sides of the tunnel are silty fine sand strata. Once permeable, the consequences are unimaginable; Fifth, long-distance tunneling. Due to large geological changes, the shield machine must successfully cross more than 2500 meters at one time

due to the strong water permeability and high water pressure of the tunnel, the construction has high requirements for concrete, many concrete additives have high viscosity, and the requirements for concrete pumping are high and difficult. The use of pump tiger new type III concrete delivery pump ensures the construction progress, and is praised as "tiger in the pump" by the construction unit

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