| 摘要 |
PROBLEM TO BE SOLVED: To provide a timbering member capable of securing safety of work and also workability of a SEW-method, and a cutting method for an earth-retaining wall.SOLUTION: A timbering member 1 is a strengthening member provided to allow a cuttable region which is a part of an earth-retaining wall 31 of a shaft 30 to oppose an external force of earth pressure and water pressure of the earth therearound. The timbering member 1 has a body 2 in which a plurality of support pieces 3 are arranged in series and connected together, and is disposed between a shield machine S and the cuttable region and used when the cuttable region is cut by the shield machine S. When the shield machine S is actuated in a state that the timbering member 1 is disposed between the shield machine S and the cuttable region, an external force is applied to the timbering member 1 in a direction orthogonal to a traveling direction of the shield machine S and the support pieces 3 move relatively and are separated from each other based on mating surfaces G of the support pieces 3. |
