PILE DRIVER

To provide a pile driver with a stay bracket that can be easily and safely attached to and detached from the reader.SOLUTION: In a pile driver in which a reader 18 and a backstay 28 are erected from a collapsed state after being assembled in front of a base machine, a stay bracket 36 removably provided on the back of the reader 18 to hold a pair of left and right back stays 28 in a collapsed state has a bar 38 provided with a reader mounting part 37 in the middle portion in a longitudinal direction, a stay holding part 39 provided on both ends of the bar 38, and a connecting part 40 provided in an area C2 including the leader attachment portion 37 among the areas C1, C2, and C3 that divide the bar 38 into three equal parts in the longitudinal direction, and which connects the stay bracket 36 as two separate parts BL, BR separable from each other depending on the presence of the leader attachment portion 37. The bar 38 is provided with a plurality of suspensions 41, 42, 43 corresponding to the center of gravity that fluctuates between the connected state of the stay bracket 36 and its disconnected state.SELECTED DRAWING: Figure 5 【課題】リーダへの脱着作業が容易かつ安全に行えるステーブラケットを備えた杭打機を提供する。【解決手段】リーダ１８とバックステー２８とをベースマシンの前方で地組みした後に倒伏状態から立て起こして立設する杭打機において、リーダ１８の背面部に、左右一対のバックステー２８を倒伏状態で保持する着脱可能に設けられたステーブラケット３６は、長手方向の中間部にリーダ取付部３７を備えたバー３８と、バー３８の両端部にそれぞれ設けられたステー保持部３９と、バー３８を長手方向に３等分した領域Ｃ１，Ｃ２，Ｃ３のうちのリーダ取付部３７を含む領域Ｃ２に設けられ、リーダ取付部３７の有無でステーブラケット３６を２つの分割体ＢＬ，ＢＲとして互いに分離可能に連結する連結部４０とを有し、バー３８には、ステーブラケット３６の連結状態とその解除状態とで変動する重心に応じた複数の吊り部４１，４２，４３が設けらる。【選択図】図５