METHOD TO CONTROL OPENING OF LOCK JOINT OF METAL SHEET PILES AND DEVICE FOR ITS REALISATION Russian patent published in 2014 - IPC E02D5/08 

FIELD: construction.

SUBSTANCE: invention relates to construction, namely, to drive metal sheet piles into earth, and more specifically to control of quality of the specified process, related to rupture (opening) of a lock joint at depth. The method to control opening of a lock joint of sheet piles consists in driving a sheet pile into earth, and the sheet pile has locks with the inner cavity, and submersion of the next sheet pile into the earth. Prior to driving of piles into soil to the inner cavity of the metal sheet pile, at the side of pile insertion into soil, they place a signal device with source of oscillations with varied frequency, at the same time period of signalling device operation exceeds the time of pile driving. The pile is driven, the receiver of oscillations is installed on the upper end of the pile, and the signal is received from the source of oscillations. Prior to driving of the next sheet pile on the inner side of the free lock they install a signalling device, comprising a wedge-shaped body facing with a sharp end down, on which at the side of the short cathetus there is a source of oscillations. When the next pile is driven, its lock, as the signalling device placement depth reaches the previous pile by the edge of its inner cavity, breaks the source of oscillations, and oscillations are no longer accepted by the receiver, which means that the lock of the specific pair of metal sheet piles during submersion does not open. If when the next pile is submerged to the depth of installation of the signalling device at the next pile the receipt of oscillations continues, it means the lock joint of this pair of sheet piles in the soil thickness broke (opened).

EFFECT: provision of detection of a break (an opening) in depth of soil of lock joints of metal sheet piles during their submersion.

3 cl, 1 dwg