Research on Atmospheric Pressure Replacement Technology of Large-Diameter Slurry Shield with Pressurized Hob Gates
Large-diameter slurry shield in the excavation process by the influence of bad ground,hob and other tools and gates are very easy to cause damage,greatly restricting the construction efficiency,how to replace the gate after the gate damage is the current construction of the engineering problems faced.This paper addresses this issue,on the basis of the existing hob cutter tool barrel replacement technology,puts forward a pressurized hob gate atmospheric pressure replacement technology,and introduces the basic principle of the technology and the main points of operation.Then,taking the under-construction Wuhu City South River Crossing Project as an example,for the composite stratum of the middle section of the river crossing,such as upper soft and lower hard and the unique engineering difficulties faced by the project,it elaborates on the specific operation steps of the atmospheric pressure replacement technology of the hob gate with pressure and its technological advantages,and realizes the technological breakthrough of the replacement of the hob gate under the atmospheric pressure of the domestic shield structure,which greatly saves the time of changing the cutter and ensures the smooth progress of the construction.
river-crossing tunnellarge-diameter slurry shieldcomposite stratahob gate replacementoperation process
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