Soft rock large-deformation tunnel primary support reinforcing device and construction method thereof

The invention discloses a soft rock large-deformation tunnel primary supporting and reinforcing device and a construction method thereof.The primary supporting and reinforcing device is used for being arranged in cooperation with a primary supporting structure, the primary supporting structure is used for supporting tunnel surrounding rock, and the primary supporting and reinforcing device is used for reinforcing the primary supporting structure so as to further support the tunnel surrounding rock; the primary support reinforcing device comprises a first support structure and a second support structure, wherein the first support structure is fixedly connected with the primary support structure to further support the tunnel surrounding rock; the second supporting structure is fixedly connected with the first supporting structure and used for increasing the supporting force of the first supporting structure; and the third supporting structure is fixedly connected with the tunnel surrounding rock in the radial d