FIELD: offshore structures construction.
SUBSTANCE: invention relates to the construction of offshore structures, and in particular to the technology of fastening pipe steel piles in the support base of offshore fixed structures (platforms). A method for fastening pipe piles in the support base of offshore fixed structures, in which the support base of the offshore structure is installed on the seabed, the pipe piles 1 are driven into the seabed through the guide sleeves 5 of the support base, a device equipped with a hydraulic cylinder 3, including a piston 13, is lowered into the pile 1 and an elastomeric (polyurethane) punch 14, to such a depth that the opening between the body 4 and the cover 20 of the hydraulic cylinder 3 is located opposite the inner circular groove 6 of the tubular steel sleeve 5; when pressure is created in the hydraulic system of the hydraulic cylinder 3, the piston 13, moving along the pipe 19, creates pressure on the elastomeric (polyurethane) punch 14 located between the cover 20 of the hydraulic cylinder 3 and the piston 13. The punch 14, compressing under this pressure, simultaneously expanding in the radial direction through the opening in the body 4 of the hydraulic cylinder 3, acts on the inner surface of the wall of the pipe pile 1 in the area of the location of the inner circular groove 6 of the sleeve 5, which, at a pressure exceeding the yield strength of the pile material 1 is expanded (deformed) into the inner circular groove 6 of the sleeve 5. The expansion of the pile wall 1 occurs in the plastic deformation zone of the pile material. At the end of the deformation process when the pressure in the hydraulic system is released, the piston 13 of the hydraulic cylinder 3 returns to its original transport position I due to the restoration of its original shape by the polyurethane punch 14. The device for implementing the method is equipped with a hydraulic cylinder 3, including a piston 13 and an elastomeric (polyurethane) punch 14, which are fixed on one steel pipe 19, providing a circular opening between the body 4 and the cover 20 of the cylinder 3. Inside the pipe 19 are channels 9, 12 for supplying hydraulic fluid into the hydraulic cylinder 3. When pressure is created in the hydraulic system of the cylinder 3, the piston 13 of the device moves along the pipe 19, compresses the elastomeric (polyurethane) punch 14, distributing it through the opening in the radial direction. When the pressure in the hydraulic system is released, the piston 13 of the hydraulic cylinder 3 returns to its original transport position I due to the restoration of its original shape by the polyurethane punch 14. The options of the method also provide for the descent inside the pile 1 of a device equipped with several hydraulic cylinders, for example, two cylinders 3, 10, two pistons 13, 17 and two polyurethane punches 14, 16 mounted on a steel pipe 19. The device in the pile is installed so that the openings between housings 4 and 8, respectively, the upper 3 and lower 10 cylinders were opposite the inner circular groove 6 of the sleeve 5.
EFFECT: increased reliability of fastening pipe steel piles in the sleeves of the supporting base due to the use of a device that is simple in design and manufacture, equipped with hydraulic cylinders that provide expansion of the pile only along the entire diameter of the internal groove of the sleeve using elastomeric (polyurethane) punches, as well as reducing labor costs and reducing the cost of work.
9 cl, 4 dwg
