Abstract: The present disclosure relates to a stabbing system for installing an offshore jacket structure and an installation method for installing an offshore jacket structure using the same.

Abstract: A heave tolerant pile guiding device for guiding a pile including a cylindrical section and above said cylindrical section a tapered section that narrows in upward direction. The device includes a frame to be mounted to a vessel having a hull subject to sea-state induced motion during installation of a pile. At least one pair of first and second pile engaging devices is arranged on the frame diametrically opposed relative to a center axis. Each pile engaging device comprises a pile engaging member and a hydraulic cylinder to move the member radially relative to the center axis. A hydraulic system includes a position control circuit and a sphincter control circuit. The sphincter control circuit is configured to operate the pair of first and second hydraulic cylinders in particular when the pile engaging members engage on the tapered section of the pile. The sphincter control circuit is a rotary flow divider.

Abstract: A system for autonomously deploying geophysical cables in sand dunes includes a surface station positioned at the sand dunes, one or more subsurface burrowing robots including distributed acoustic sensing geophysical cables laying robot, and a geo-locating radio system (GLRS). The one or more subsurface burrowing robots digs in the sand dunes to a target depth located between a base of the sand dunes and a base of loose sand, autonomously moves under a surface of the loose sand along a predefined path, exchanges data with the surface station via an unspooling cable, and receives commands from the surface station via the unspooling cable. The GLRS transmits telemetry data from the one or more subsurface burrowing robots to the surface station. The GLRS comprises a first GLRS positioned on the base of the sand dunes and a second GLRS disposed on the one or more subsurface burrowing robots.

Abstract: A method of installing a new underground pipe adjacent an existing underground pipe begins with drilling a series of substantially vertical boreholes downwardly from the ground surface so as to expose a portion of the existing pipe. Then, a pilot stem is directionally bored in a first direction adjacent the existing pipe and intersecting the bottoms of the vertical boreholes. Next, a reamer head is pulled in an opposite direction to enlarge the pilot hole, while pulling the new pipe through the enlarged hole behind the reamer head. The new pipe extends substantially parallel and adjacent the existing pipe. When the existing pipe is a water main, water service through the existing pipe is maintained during these drilling steps, until the new pipe is installed and connected for water service. The existing pipe is retained and can be repurposed for other uses.

Abstract: A marine foundation such as a jacket or a tripod foundation for a wind turbine has suction piles that are subjected 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, maximizing water flow friction and reducing the risk of liquefaction of the soil.

Abstract: A root zone warming system (10) for an athletic field of natural turf (11) supplies positive pressurization to the root zone via a piping network (12) with openings. The system (10) enables control of the temperature of the supplied air by varying the flow resistance at an output end of a constant air supply source (27), such as a positive displacement blower. By increasing the flow resistance at the output end of the blower (27), with a variably controllable valve (29), the operating temperature of the blower (27) increases and thereby causes a corresponding increase in the temperature of the air supplied therefrom. By varying the flow resistance a user can vary the temperature of the air supplied to the piping network (12) and to the root zone, thereby to control the amount of warming of the root zone so as to reduce the onset, degree, or duration of turf dormancy during the winter season.

Abstract: A gravity-based structure (GBS) includes central and protruding parts having a common base slab. For the central part, outer and inner walls and a top slab are cast in concrete so that the GBS forms a rectangular prism. As casting of individual outer wall sections is completed, a reinforcement cage is assembled, formwork is installed, and protruding part outer and inner walls are cast, the outer walls being formed along the base slab perimeter with a height lower than the central part outer wall height. As separate protruding part wall sections are cast, a reinforcing cage is assembled, formwork is installed for a protruding part top slab, and then cast. Post-tensioning of central part base and top slabs and central and protruding part outer and inner walls is done as central and protruding part top slab casting is completed and the concrete is cured, increasing buoyancy and reducing submersion.

Abstract: A buoyant tension leg platform arranged to support a renewable energy capturing device when the platform is submerged in a body of water. The platform has at least three vertices or lateral extents, at least three of the vertices or lateral extents have a mooring arrangement. The mooring arrangement includes a first mooring line extending between the vertex or lateral extent and a first anchor point in communication with a bed of the body of water. The first mooring line extends at an angle relative to the bed and a second mooring line extending from the vertex or lateral extent to a second anchor point. The second mooring line extends at an angle relative to the bed, such that the mooring arrangement of the corresponding vertex or lateral extent defines a triangle.

Abstract: A sluice gate for a hydropower station, a method of operating a sluice gate and a hydropower station. The sluice gate includes rollers via which the sluice gate can be movably mounted on rails and a sealing surface having a seal with which an upstream water can be sealed off from a downstream water. Lubricant lines are provided through which lubricant can be fed to the rollers and lubricant return lines are connected to the rollers. Via the lubricant return lines, used lubricant can be guided from the rollers to one or more collection locations in order to be able to collect and properly dispose of used lubricant.

Abstract: Disclosed are exemplary embodiments of woven silt fences including integrally woven pockets for support posts. In exemplary embodiments, a woven silt fence fabric includes one or more integrated pockets integrally woven within the woven silt fence fabric. The one or more integrated pockets are configured for receiving one or more support posts therein. In exemplary embodiments, a woven silt fence comprises the woven silt fence fabric and one or more support posts configured to be received within corresponding ones of the one or more integrated pockets integrally woven within the woven silt fence fabric. The one or more support posts may be configured to be positioned within corresponding ones of the one or more integrated pockets and driven into the ground for supporting the woven silt fence without requiring any fasteners for attachment of the one or more support posts to the woven silt fence fabric.

Abstract: There is provided a linear electric machine comprising a mover connected to a ram block for striking a pile, a processor operatively connected to the linear electric machine and configured to determine a total target kinetic energy for striking a pile using a ram block connected to a mover of a linear electric machine of the piling hammer, determine a first portion of the total target kinetic energy for striking the pile at least based on a mass of the ram block, determine a second portion of the total target kinetic energy for striking the pile based on the total target kinetic energy and the first portion of the total target kinetic energy, and control the linear electric machine to accelerate the mover based on the determined second portion of the kinetic energy for striking the pile by the linear electric machine.

Abstract: 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.

Abstract: A rainwater storage device includes a plurality of water storage pipes buried in a ground, the water storage pipes each having a rainwater inflow port on a surface of a ground; and a lower connecting pipe that connects bottom part regions of the plurality of water storage pipes. The plurality of water storage pipes is arranged in a plurality of rows and columns, extending in a longitudinal direction and a lateral direction, respectively, and the lower connecting pipe is arranged in an inclined state toward one water storage pipe out of the plurality of water storage pipes.

Abstract: A monopile foundation in the form of a cylindrical steel pipe that can be driven into the bottom of a water basin. The monopole foundation includes a bottom area, and an area above the bottom area. The area above the bottom includes a connection flange, and a tight membrane consisting of a bottom panel and of a top panel with at least one reinforcing rib, and filling between the panels. Above the membrane, the monopile foundation contains dry functional space between the membrane and the top connection flange, while in the bottom area of the monopile foundation, below the bottom panel of the membrane, there are openings in the cylindrical steel pipe of the monopile foundation. The space between the bottom panel of the membrane and the top edge of the outlet openings is filled by an air cushion.

Abstract: Disclosed is a system and method for transferring fish past a barrier between an upper and lower body of water, including an inlet conduit 11 connecting the upper body to a transfer chamber 13 adjacent the lower body, a delivery conduit 15 connecting the transfer chamber 13 to a level above the surface of the upper body, a valve 12 between the inlet conduit and the transfer chamber, and a gate 14 between the transfer chamber 13 and the lower body. The inlet conduit 11 holds sufficient water so that, once the gate 14 is closed and the valve 12 is opened, fish in the transfer chamber 13 are transported with the water in the transfer chamber through the delivery conduit 15 to an outlet 16.

Abstract: A method for pile installation wherein use is made of a vessel for pile installation. A pile holding system is mounted to the hull of a vessel, e.g. on deck (2) of a vessel, which pile holding system is configured to hold the pile in an upright orientation at a pile installation location at least whilst suspended from a crane by means of one or more winch driven cables, e.g. for installation of a pile adapted to support an offshore wind turbine, the pile holding system comprises a pile holding tool (40).

Abstract: A manipulator device to apply modules around a pipeline during assembly has two jaws mobile between an open and a closed position and configured to house the respective portions of the module, and an articulated mechanism having a plurality of degrees of freedom to place the jaws in a loading position and in a position wherein the jaws are aligned with the pipeline during assembly.

Abstract: A method for installing and assembling a truss foundation to support a single-axis solar tracker. A positioning subsystem determines an orientation of a machine mast's driving axis relative to an intended drive axis and controls the mast to be positioned so that the mast's driving axis is aligned with the intended drive axis of the screw anchor foundation component. After a pair of adjacent screw anchors are driven, the controller causes motion controllers to orient the mast so that an alignment jig for supporting truss apex hardware is held in place relative to the driven screw anchors at a predetermined point in space above them so that upper leg sections can be sleeved over connecting portions of the apex hardware and down on to the driven screw anchors.

Abstract: A reinforcement element for a diaphragm wall is described. The reinforcement element includes a reinforcement cage, the reinforcement element further includes a seal-carrier provided with a mounting part for receiving at least one seal, which is elongated, the seal-carrier is fixed to the first end part of the reinforcement cage and extends along the longitudinal direction of the reinforcement cage, the seal-carrier defines a housing for receiving the seal, at least a first part of which is surrounded by a sacrificial material. Additionally, a method for making a diaphragm wall in the ground is described that comprises placing the reinforcement element in a first trench, pouring concrete into the first trench, and discharging the sacrificial material out of the housing using a scraping tool.

Abstract: A method and system for tensioning a hyperstatic system involves two structures connected to each other, including: a) connecting, by at least one non-adjustable tendon and at least one adjustable tendon which is formed by a tendon coupled to a cylinder in an initially retracted position, an upper structure to a lower structure which is positioned below the upper structure while maintaining zero tension in the tendons; step b) applying a force to the upper structure and/or the lower structure in order to tension each adjustable tendon and to deploy the respective cylinder thereof, the tension of each non-adjustable tendon remaining at zero; and step c) progressively increasing the force until the tension of each non-adjustable tendon reaches a threshold value which brings about a load transfer from the lower structure to the upper structure to allow the lower structure to be supported by the upper structure.