Multi-opening multi-pipe-section large-section tunnel, construction method, pipe section connection structure and connection method

The invention discloses a pipe section connection method and connection structure of a large-section tunnel for a pipe-jacking construction method. The structure comprises two adjacent pipe sections longitudinally connected to each other and a connection part. Upper parts of two sides of inner walls of the pipe sections are provided with tensioning portions with tensioning holes, and an elastic water stop ring for sealingly connecting the two tensioning holes is arranged between the two pipe sections. The connecting part comprises a rigid rod body and two cushion blocks which are provided withholes for grouting. The two pipe sections are fixed together through the connection part passing through the tensioning holes, and a pouring sealing body is arranged in the tensioning holes and the elastic water stop ring. The connection structure has the advantages of convenience in installation, little possibility of rust and good shear resistance. The invention also comprises a multi-pipe-section large-section tunnel