A method and fixturing apparatus for manufacturing a suction caisson foundation includes providing an elevated center support and peripheral supports, elevating the foundation's prefabricated thumb section atop the center support, and temporarily securing radial frame members about the circumference of the prefabricated thumb section with the each frame member resting atop a respective peripheral support. The skirt panels are then affixed to the frame members, and the frame members to the prefabricated thumb section to thereby become self-supporting. The center support is removed from the interior of the resulting bucket, as by raising the peripheral supports to unload the center support, and lowering and dismantling the center support, whereupon additional panels are affixed to the frame members to define the foundation's lid, and further shaft sections added atop the prefabricated thumb section to complete the foundation. Temporary beams bridging preselected framing members advantageously allow use of transportation crawlers.

A method of installing foundation elements, in particular (mono)piles having a diameter of five meters or more, in an underwater ground formation includes lowering a leader from a surface vessel with at least the tip of the leader into the water, and lowering a foundation element and/or a noise mitigation screen along the leader.

A method and a device to create a foundation in which a foundation pipe is driven into the soil. At least one bore is created into the soil in the perimeter area of the foundation pipe to insert before ramming by means of a drilling tool the diameter of which is significantly smaller than a diameter of the foundation pile. The soil material removed during drilling remains essentially within the bore. Furthermore, a foundation with a foundation pipe which is created accordingly.

A foundation system for the foundation of an offshore structure includes a monopile having an anchoring portion anchorable in a seabed and a connection portion disposed at the opposite end. A platform structure is connected directly to the connection portion of the monopile or indirectly via a transition piece. The platform structure is disposable above a water surface. The foundation system includes at least two stabilizing devices connected directly to the platform structure or indirectly to the platform structure via the transition piece. The stabilizing devices are attachable to the seabed such that tensile forces or compression forces are transmittable between the seabed and the platform structure. Securing points on the stabilizing devices, together with the connection portion of the monopile, define a plane having a horizontally extending component.

Foundation systems and methods using in-situ shaped pile-anchors that are particularly adapted for use in aquatic environments. The shaped pile-anchor of the invented foundation includes a concrete filled tubular metal casing, the bottom end of which is positioned at a predetermined depth in the ground (e.g., aquatic-floor soil) and the top end of which protrudes above the water or soil surface. Concrete fills the inside the metal casing, substantially all the way to the top end of the casing, forming an upper portion of a concrete column. The lower portion of the concrete column extends down below the bottom end of the metal casing and further into the ground. The lower portion is shaped to have a cross-section greater than the cross-section of the upper portion, which equals to the inner diameter of the tubular metal casing. A platform is coupled to one of more of the shaped pile-anchors to support a structure above.

The present invention is a grouting method for single pile rock-socketed foundation for offshore wind power, comprising: driving a steel casing into an overburden layer to dig the overburden layer and a rock stratum so as to dig a pile hole; hoisting a steel pipe pile into the steel casing and positioning the steel pipe pile in the pile hole, wherein an annular cavity is formed between the inner walls of the steel pipe pile and the pile hole and the bottom of the steel casing; grouting a first grouting layer to the bottom of a pipe hole of the steel pipe pile; grouting a plurality of grouting layers into the upper end of the first grouting layer in the annular cavity; and pulling out the steel casing, wherein after a grouting solution is aged, the steel pipe pile is stably connected to the overburden layer and the rock stratum.

The invention relates to a suction pile comprising a cylinder shaped body (1) with a closed end (3) and an open end (2), means (4) for attaching an arrangement to ejecting entrapped water, air and mud, but also provide a pressure difference within the suction pile during installation, and an attachment system (10) for attaching external equipment to the suction pile, the suction pile is formed with a skin portion (17) and at least one flange portion (6). At least one of the flange portions (6) comprises an element (11, 26) that form at least a part of the attachment system (10) for external equipment.

The present invention relates to a free-sliding seabed mudmat foundation, which belongs to the fields of offshore and ocean engineering. The mudmat comprises a base foundation, an upper foundation, and a cover plate. The base foundation sits on the seabed to support dead weights of the mudmat itself and the subsea production system fixed on the mudmat. The upper foundation, with a plurality of universal rolling ball bearing being attached to the bottom, can slide on the base foundation when it is subjected to a horizontal push force generated by the pipeline during operation. Therefore, the axial load on the pipeline during operation due to heating and pressurization is released and the buckling failure risk is then reduced. The mudmat disclosed has smaller size and lighter weight, which is beneficial in reducing fabrication costs and reducing requirements for cranes on the pipeline laying vessel.

The present invention belongs to the technical field of offshore wind power construction and particularly relates to a system and a method for sealing expanded polymer-based pile shoes for a jacket. The system comprises a jacket disposed on a seabed, several pile shoes arranged around a lower end of the jacket, and several steel pipe piles inserted into the seabed, wherein the steel pipe piles are inserted into the corresponding pile shoes. The system is characterized in that gaps between the pile shoes and the steel pipe piles are respectively filled with concrete and an expanded high polymer from top to bottom, an annular elastic diaphragm is further connected to the inner walls of the pile shoes, and the expanded polymer is wrapped by the elastic diaphragm, such that the expanded polymer is isolated from the steel pipe piles and the concrete.

Foundation systems and methods using in-situ shaped pile-anchors that are particularly adapted for use in aquatic environments. The shaped pile-anchor of the invented foundation includes a concrete filled tubular metal casing, the bottom end of which is positioned at a predetermined depth in the ground (e.g., aquatic-floor soil) and the top end of which protrudes above the water or soil surface. Concrete fills the inside the metal casing, substantially all the way to the top end of the casing, forming an upper portion of a concrete column. The lower portion of the concrete column extends down below the bottom end of the metal casing and further into the ground. The lower portion is shaped to have a cross-section greater than the cross-section of the upper portion, which equals to the inner diameter of the tubular metal casing. A platform is coupled to one of more of the shaped pile-anchors to support a structure above.