| 摘要 |
PURPOSE:To shorten the term of construction and reduce the cost of the construction by excavating one of multiple lane type shield tunnels to perform primary covering, and by performing secondary covering in parallel in the other residual tunnels to perform the covering alternately for every fixed length. CONSTITUTION:On the side of a tunnel 2a on the upper side, the primary covering of the carrying-out of excavated earth or the like, the carrying-in of the material of a segment 3 or the like, or the like is performed. After that, on the lower side of a tunnel 2b, in rough parallel, moving type molds 15 are used, and by a concrete pressure-feeding pipe 16, ready-mixed concrete or the like is placed between a primary covering segment 3' and a mold 17, and secondary covering concrete 18 is constructed. Then, the secondary covering in the lower side tunnel 2b is completed by a fixed length, and after that, on the contrary, on the upper side, the secondary covering is performed, and this work is alternately repeated, and in a tunnel 2, the secondary covering concrete 18 is constructed. As a result, the work of the primary covering and the work of the secondary covering are executed in parallel with each other almost at the same time, the term of construction can be extremely shortened. |
