Shield segment bolt shield is a kind of construction method of tunnel under the ground. Has been widely used in subway, railway, highway, municipal, hydropower and other tunnel engineering. In the construction, the use of shield machine in underground excavation, in order to prevent the soft foundation excavation surface collapse or maintain excavation face stability, at the same time in tunnel lining operations, the lining of prefabricated segment by segment bolt reinforcement. Due to the different size of different geological conditions on shield applied pressure, design and mechanical properties of shield segment bolt is 5.8, 6.8, 8.8, 10.9 multiple levels.
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