METAL SHEATHED CABLE DESIGNED BASED ON TORQUE BALANCE AND DESIGN METHOD THEREFOR

摘要

Disclosed are a metal sheathed cable designed based on torque balance and a design method therefor. Optical units (1) and control units (2) are helically twisted together, grounding wire units (4) are distributed in gaps between the optical units (1) and the control units (2) to form an inner layer cable core, fillers (7) are watertightly filled into the gaps among the optical units (1), the control units (2) and the grounding wire units (4) of the inner layer cable core, and a taped covering (6) is arranged outside the inner layer cable core; power units (3) and filling cores (5) are helically twisted around the inner layer cable core, the grounding wire units (4) are distributed in the gaps between the power units (3) and the filling cores (5) to form an outer layer cable core, the fillers (7) are watertightly filled into the gaps among the power units (3), the grounding wire units (4) and the filling cores(5) of the outer layer cable core, and a taped covering (6) is arranged outside the outer layer cable core; an inner protective layer (8) is wrapped outside the outer layer cable core, and sheathing layers (9) are twisted outside the inner protective layer (8). By means of the torque balance design, the sheathing layers (9) effectively solve the problem of a torque deviation existing between layers inside a steel wire sheathing layer of a metal sheathed cable at the structural design level, thereby guaranteeing that the metal sheathed cable does not rotate when bearing a working load.