To address the difficulties caused by dense end nodes and restricted working spaces in elevated sections

this paper proposes a terminal fixing device with dual protection consisting of a screw clamp and an elastic rope

and establishes a torque-angle calibration procedure to achieve standardized tightening and self-locking. The results show that the technical solution proposed in this study reduces the single installation time from 12.4 minutes to 3.7 minutes

decreases the cycle time by 70%

and improves the reliability from 94.6 to 99.8. The tension fluctuation is controlled within the specified ±10 supervisory limit

and the temperature rise of the outer shell meets the requirements of the national standard.