Shield bolt is a special fixed structure. In the construction of shield tunnel, due to the different strata, the contact surface between shield tail and foundation will be uneven, then the shield tightening bolt can connect the shield tail to the foundation well, and play the role of fixing the roof and foundation. At the same time, the tensile properties of the tightening bolts can also take into account the needs of foundation deformation, reduce the impact of foundation on the shield, and ensure the safety of the tunnel.