A stabbing system for installing an offshore jacket structure, wherein the stabbing system is used for fixing a jacket leg of the offshore jacket structure inserted into a seabed-pile, the seabed-pile being pre-inserted into a seabed, the stabbing system comprising:
- a stabbing member that is installed on an external surface of the jacket leg and supported by an upper end surface of the seabed-pile when the jacket leg has been inserted into the seabed-pile;
- a plurality of vertical grippers that are installed in the stabbing member and operated toward an upper end surface of the seabed-pile to adjust an angle between a longitudinal axis of the jacket leg and a horizontal plane defined by a seabed surface;
- a plurality of horizontal grippers that are installed in an outer periphery of the stabbing member and operated toward an external surface of the seabed-pile to fix the jacket leg to the seabed-pile;
- and
- a grouting unit that introduces grout into a space between the jacket leg and the seabed-pile, wherein:
- the stabbing member includes a horizontal support plate that is formed in a form of ring plate on the external surface of the jacket leg and seated on the upper end surface of the seabed-pile;
- the stabbing member includes a vertical support plate that has a tubular form, is bent in an outer periphery of the horizontal support plate and is connected to a lower part thereof;
- each of the vertical grippers are spaced apart from each other at a certain interval in a circumference direction on an upper surface of the horizontal support plate, and a vertical gripper piston is operated toward the upper end surface of the seabed-pile by a vertical hydraulic cylinder, adjusting the angle between the longitudinal axis of the jacket leg and the horizontal plane defined by the seabed surface of the seabed-pile;
- each of the horizontal grippers includes an upper horizontal gripper, spaced apart from each other at a certain interval in a circumference direction on an external surface of the vertical support plate so that an orientation of each upper horizontal gripper is perpendicular to an orientation of each vertical gripper, and a first piston is operated toward the external surface of the seabed-pile by a first hydraulic cylinder, fixing the jacket leg to the seabed-pile;
- each of the horizontal grippers includes a lower horizontal gripper, spaced apart from each other at a certain interval in a circumference direction on an inner end surface of the jacket leg and a second piston is operated toward an inner surface of the seabed-pile by a second hydraulic cylinder, fixing the jacket leg to the sea-bed pile, wherein an orientation of each lower horizontal gripper is perpendicular to the orientation of each vertical gripper;
- the grouting unit is installed inside the jacket leg, and a lower end thereof passes through and is connected to a lower end of the jacket leg, forming a grout pipe through which the grout is introduced into the space between the jacket leg and the seabed-pile after the jacket leg has been fixed inside the seabed-pile;
- the grouting unit further includes a grout seal provided between a lower end surface of the jacket leg and the seabed-pile;
- and
- a detachable vertical gripper ring is provided between the horizontal support plate and the each of the vertical grippers to prevent a direct application of stress concentration to the seabed-pile.