EARTH RETAINING STRUCTURE AND EARTH RETAINING METHOD

To provide an earth retaining structure improved in rigidity and strength of double earth retaining wall, and an earth retaining method.SOLUTION: A first wall body 11 is driven into the ground to partition a cutting side from an earth side. A second wall body 12 is driven into the ground in the earth side from the first wall body 11 with an interval from the first wall body 11. A head part connection material 13 connects and fixes the head part of the first wall body 11 with the head part of the second wall body 12. An inner connection material 14 is formed of, for example, flat steel, and connects the first and second wall bodies 11 and 12 at an intermediate position in the driving direction. The first and second wall bodies 11 and 12 are rigidly joined to the head part connection material 13 by concrete to form a rigid-frame structure, and can restrain the ground between the first and second wall bodies 11 and 12. The first and second wall bodies 11 and 12 can be driven into the ground at the same time in a connected state by the inner connection material 14.SELECTED DRAWING: Figure 1 【課題】二重土留め壁の剛性・強度アップを図ることが可能な土留め構造ならびに土留め方法を提供する。【解決手段】第１の壁体１１は、地盤に開削側と地山側とを仕切るように打ち込まれる。第２の壁体１２は、第１の壁体１１より地山側の地盤に、第１の壁体１１に対し間隔をあけて打ち込まれる。頭部連結材１３は、第１の壁体１１の頭部と第２の壁体１２の頭部とを連結固定し、内部連結材１４は、例えば平鋼からなり、打ち込み方向の中間位置で第１及び第２の壁体１１、１２を連結する。また、第１及び第２の壁体１１、１２と頭部連結材１３とは、コンクリートにより剛接合して、ラーメン構造をなすと共に、第１及び第２の壁体１１、１２間の地盤を拘束してもよい。また、第１び第２の壁体１１、１２は、内部連結材１４による連結状態で、地盤に同時に打ち込まれてもよい。【選択図】図１