Gravel pile length auxiliary control device

The utility model discloses a gravel pile length auxiliary control device which comprises a limiting feeler lever and a limiting instrument. The bottom of a pile machine vibratory hammer is connectedwith the upper end of a vertical pile machine immersed tube. The limiting instrument comprises a warning indicator, a triggering device and a resetting device; the trigger device comprises an insulator main board, a rotator with a hinged center is mounted on the insulator main board, the rotator is divided into a first part and a second part by taking a center hinge fixing point of the rotator asa boundary, the first part is fixed on the insulator main board, and the second part is fixed on the center hinge fixing point in a free rotating manner; two side ends of the second part are respectively connected with a spring and one end of a telescopic rope; according to the vibration immersed tube gravel compaction pile position elevation warning device, manual observation is replaced with mechanical warning, and the v