Protection of existing electric power pipeline in newly-built subway shield tunnel

The utility model discloses a newly-built subway shield tunnel for protecting an existing power pipeline, which comprises an upper layer pipeline, a lower layer tunnel and an inverted trapezoidal starting shaft, the upper layer pipeline penetrates through the inverted trapezoidal starting shaft, the lower layer tunnel also penetrates through the inverted trapezoidal starting shaft and simultaneously penetrates through the lower part of the upper layer pipeline in a crossed manner, and reinforced concrete pile groups are arranged on two sides of the lower layer tunnel. A reinforced concrete slab is arranged right above the steel plate; the two ends of the reinforced concrete plate are fixed to the upper end faces of the two reinforced concrete pile sets correspondingly. A plurality of grouting anchor rods located above the upper-layer pipeline are arranged in the inverted-trapezoid-shaped starting well. When the subway deep foundation pit is excavated, an inverted trapezoid is adopted for excavation, and the e