Covering works manner of multiple forma excavation hole and segment null for covering works of multiple forma excavation

摘要

PURPOSE:To improve the working efficiency by excavating a preceeding excavation hole and lining with plural circular-arc form segments, and then excavating the following excavation hole and lining it while cutting partially the segments used for the lining work. CONSTITUTION:A preceeding excavation hole 11 is excavated by advancing a shield excavator, and tube-form wall body 13 is constructed by connecting plural wall segments 15 and branch segments 18 to the inner surface of the hole 11 in order. Then the following excavation hole 14 is excavated while cutting partially the periphery of the segments 18 so as to unify the hole 11 and the axial direction, and to form the superposing part with the segments 18. Then, the tube-form wall body 30 is constructed by connecting plural wall segments 20 and branch segments 21 to the inner surface of the hole 14. And the segments 18 and 21 are connected with fastening bolts 24 from the side of the segments 21. Consequently, the lining work efficiency can be improved.