Abstract: The invention provides a tensioning device having a traction element and a body. The traction element includes a first lower portion of the traction element that resides in a tie-rod that is able to interlock with a threaded rod and a second upper portion of traction element that resides in a piston, the first and second portions of traction element being integral in displacement. The traction element is axially moveable in a bore of the body and co-axially mounted around the traction element, the body providing a first lower portion of the body that resides in a tubular support sleeve and a second upper portion of body that resides in a cylinder. An annular chamber is formed between the traction element and the body and intended to receive a pressurized fluid.

Abstract: The invention concerns a rod tensioning device having a first actuator, at least a second actuator and a tubular support sleeve dedicated to radially surround a threaded rod. Each of the actuators provides a cylinder, and a piston sliding in the cylinder and forming with the cylinder an annular chamber dedicated to be supplied with pressurized fluid. According to the invention, the at least second actuator is temporary axially arranged between the first actuator and the tubular support sleeve for a temporary blockwise assembly, the pistons of two axially adjacent actuators being indexed in rotation together.

Abstract: The invention concerns a rod tensioning device having a first actuator, at least a second actuator and a tubular support sleeve dedicated to radially surround a threaded rod. Each of the actuators provides a cylinder, and a piston sliding in the cylinder and forming with the cylinder an annular chamber dedicated to be supplied with pressurized fluid. According to the invention, the at least second actuator is temporary axially arranged between the first actuator and the tubular support sleeve for a temporary blockwise assembly, the pistons of two axially adjacent actuators being indexed in rotation together.

Abstract: The invention provides a tensioning device having a traction element and a body. The traction element includes a first lower portion of the traction element that resides in a tie-rod that is able to interlock with a threaded rod and a second upper portion of traction element that resides in a piston, the first and second portions of traction element being integral in displacement. The traction element is axially moveable in a bore of the body and co-axially mounted around the traction element, the body providing a first lower portion of the body that resides in a tubular support sleeve and a second upper portion of body that resides in a cylinder. An annular chamber is formed between the traction element and the body and intended to receive a pressurized fluid.