Earthquake-zone-crossing subway tunnel advanced pre-support system and construction method

The invention discloses an advanced pre-supporting system for a subway tunnel crossing a seismic zone and a construction method, the advanced pre-supporting system comprises a plurality of groups of reinforced concrete foundation piles and a supporting beam, the plurality of groups of reinforced concrete foundation piles are arranged on two sides in the tunnel in parallel, and the supporting beam is arranged at the upper ends of the plurality of groups of reinforced concrete foundation piles; the steel column and the butt joint assembly are fixed in the upper end of the reinforced concrete foundation pile, the steel column is arranged at the upper end of the supporting beam, the steel column and the butt joint assembly are correspondingly arranged, and the upper end of the steel column is arranged above the inner wall of the tunnel. The device has the advantages that during mounting, the distance between foundation pits is positioned, observation by workers is facilitated during mounting, the workers can quic