Pile press-in construction method, pile supplying device, and pile press-in device

A pile press-in construction method using a pile press-in device that is provided with a saddle, a clamp device that is provided at the bottom of the saddle and configured to grasp an upper end of an existing pile that has been pressed into the ground, a mast erected in a turnable manner on the saddle, a raising and lowering device, and a chuck device that is supported by the mast via the raising and lowering device and is configured to hold a pile, the pile press-in device configured to generate a reaction force by gripping, with the clamp device, the upper end of the existing pile that has been pressed into the ground, holding the pile by the chuck device, pressing the pile into the ground by operating the raising and lowering device, and successively pressing in piles while moving on a pile row including the existing pile to thereby extend the pile row on the ground,

• the pile press-in construction method comprising:
• employing, as the pile press-in device, a pile press-in device in which the chuck device is tiltable about a chuck tilting axis that intersects with the mast and is in a direction in which the mast and the chuck device line up;
• supplying the pile in the chuck device by causing the chuck device to be laid sideways and to project outward to a side of the pile row as viewed from an axial direction of the existing pile by turning the mast and tilting the chuck device, causing the chuck device to face a direction in which an insertion direction of the pile with relation to the chuck device is a horizontal direction along the pile row, laying the pile sideways, supplying the pile, inserting the pile into the chuck device, and causing the chuck device to grasp the pile;
• transitioning an orientation of the pile to press the pile into the ground by turning the mast and tilting the chuck device;
• and
• pressing the pile into the ground.