CLOSURE PART STRUCTURE OF TUNNEL BY LINING ELEMENT AND CONSTRUCTION METHOD THEREFOR

摘要

PROBLEM TO BE SOLVED: To provide a closure part structure of a tunnel and a construction method therefor capable of simply constructing a closure part to shorten a construction term and reducing an amount of digged soil and the number of lining elements. SOLUTION: This tunnel is constructed by inserting many long lining elements 3, 4 into the natural ground sequentially prior to digging an empty cross section 2 in the tunnel and has a lining structure body 1 partitioning the empty cross section 2 in the tunnel. The lining structure body 1 forms a partially opened shape in a lower part of the tunnel, and an opened part is closed by an improving body 6 due to the improvement of the ground.