A method to manufacture native soil flowable fill includes hydro excavating native soil to form a hole at a first excavation, and transferring the native soil from the first excavation to a mixing tank. The method also includes adding a pozzolan component, cement and water to the mixing tank, mixing the native soil in the mixing tank with the added pozzolan component, cement and water to form the native soil flowable fill, and transferring the native soil flowable fill back to the first excavation and into the hole.

A offshore structure (10) comprising a tube (12) having a longitudinal axis (32) and comprising an open-ended lower end (22) whose peripheral edge (24) is adapted to cut into the sea bed (14) as the offshore structure (10) is driven into it, the offshore structure (10) comprising: a plurality of stabilisers (18) each comprising a main body portion forming a hollow interior volume (23) and having an open lower end (22) whose peripheral edge (24) is adapted, in use, to cut into the sea bed (14), whereby in use, a trapped volume of fluids is retained in the hollow interior volume between the main body portion and the sea bed (14), each stabiliser (18) further comprising an outlet (34) communicating with its respective hollow interior volume (23) and a control means (36) to control, in use, the egress of the trapped volume of fluids from the hollow interior volume (23) of each respective stabiliser (18), and wherein the geometric centres of the hollow interior volumes (23) of the stabilisers (18) are radially offset (44) from the longitudinal axis (32) of the offshore structure (10).

The present relates to a suction foundation in which is penetrated into the seabed by a vacuum pressure of a suction pump, thereby providing a desired foundation support force. The suction foundation includes a hollow caisson having an opening at a lower end thereof, where the suction pump is connected to the hollow caisson and the suction pump allows the hollow caisson to penetrate into the seabed while discharging a fluid in the hollow caisson to an outside thereof by using the vacuum pressure of the suction pump, a lower skirt provided along a circumference of the opening of the hollow caisson and formed into a wave shape having a series of teeth, and having wedge-shaped cross-sections, and a stiffener increasing rigidity of the lower skirt by increasing thickness of a predetermined portion of the lower skirt.

Disclosed is a support structure for an offshore wind power generator which is applicable to various seafloor terrains by increasing the number of seafloor penetration cylinders that are installed to be penetrated into and fixed to a seafloor ground and in which a vibration generation part and a seawater injection part assist the penetration of the seafloor penetration cylinders into the seafloor ground. The support structure for an offshore wind power generator includes: five seafloor penetration cylinders; covers provided above the five seafloor penetration cylinders, respectively; a drain part provided inside each of the covers; a seawater injection part provided in each of the five seafloor penetration cylinders to inject high-pressure seawater and align horizontal levels of the five seafloor penetration cylinders; and a supporting stand connected to the covers via connection parts.

A method for foundation consolidation combining vacuum preloading and geomembrane bag assembly loading, which comprises: digging a slurry pit, filling mud into the slurry pit and conducting vacuum preloading pumpdrainage for multiple times, laying the geomembrane bag assemblies above the soft slurry seam processed through vacuum preloading pumpdrainage inside the slurry pit to form a plurality of loading layers, and laying the geomembrane bag assemblies by piling geomembrane bags. In view of the engineering complexity and uneven settlement resulting from conventional vacuum preloading using slag loading, geomembrane bag for loading to overcome the adverse effects of slag loading. In the present invention, the drainage system and the geomembrane bag assemblies are laid out to fully leverage their perspective properties, so as to improve the transmission of vacuity in the whole soil mass, speed up the drainage rate, and increase the degree of consolidation.

A marine foundation such as a jacket or a tripod foundation for a wind turbine comprises suction piles that are subjected, in service, to cyclical loading of compression phases and tension phases in alternation. Each pile has a one-way valve that opens and closes autonomously in response to pressure differentials between the internal chamber and the surrounding water. The valve opens during the compression phases to effect fluid communication between an internal chamber of the pile and surrounding water. Water is thereby ejected from within the chamber through the valve. Conversely, during the tension phases, the valve closes and water is admitted into the pile only through soil within a skirt of the pile. Thus, a unidirectional, generally upward flow of water is driven through the soil within the skirt during the compression and tension phases, maximising water flow friction and reducing the risk of liquefaction of the soil.

Described is a method for anchoring a hollow tubular element in a water bottom. An upper outer end of the tubular element is first closed substantially airtightly by a closing body. The tubular element with closing body is taken up from a vessel with a lifting means and lowered into the water in a substantially vertical position. Air in the tubular element with closing body is here compressed and the pressure in the tubular element with closing body increases. The weight of the tubular element with closing body suspended from the lifting means is then adjusted by allowing the air to escape at least partially and/or suctioning the air away at least partially to below atmospheric pressure. The pressure in the tubular element with closing body decreases and the tubular element with closing body penetrates into the water bottom under the weight. Finally, the closing body is removed and the tubular element is optionally driven further into the water bottom with a pile-driving means.

A subsea foundation for installation on a sea floor. The subsea foundation includes a receptacle which receives a wellhead housing, and a conductor pipe which is arranged to extend from the receptacle and which receives a well pipe therethrough. The conductor pipe has a first section and a second section. The first section of the conductor pipe has a first end and a second end. The first section is connected to the receptacle at the first end and is pivotably connected to the second section at the second end so that the conductor pipe has a compact configuration, in which the conductor pipe comprises a bend therein, and an extended configuration, in which the conductor pipe is substantially straight.

The present disclosure provides an annular anchor installing instrument and an annular anchor installing method, relating to the technical field of ocean engineering. The annular anchor installing instrument includes an installation tube, a pump body assembly, a lifting portion and an installation portion. One end of the installation tube is provided with a cover body, and the other end of the installation tube is configured to be an open end for cooperating with the top of the annular anchor. The pump body assembly is arranged on the cover body, and used to vacuum the interior of the installation tube. The lifting portion is arranged on the cover body, and used to connect with a hoist. The installation portions are removably arranged on the cover body, and used to connect with the hoist and the anchor chain of the annular anchor, respectively.

Disclosed is a support structure for an offshore wind power generator which is applicable to various seafloor terrains by increasing the number of seafloor penetration cylinders that are installed to be penetrated into and fixed to a seafloor ground and in which a vibration generation part and a seawater injection part assist the penetration of the seafloor penetration cylinders into the seafloor ground. The support structure for an offshore wind power generator includes: five seafloor penetration cylinders; covers provided above the five seafloor penetration cylinders, respectively; a drain part provided inside each of the covers; a seawater injection part provided in each of the five seafloor penetration cylinders to inject high-pressure seawater and align horizontal levels of the five seafloor penetration cylinders; and a supporting stand connected to the covers via connection parts.