Water Reservoirs and wetlands are a major source of methane emissions contributing to greenhouse gases. The annual flood seasons contribute to movement and accumulation of sediments behind irrigation and hydropower dams. These sediments accumulate year after year, lead to loss of water storage capacity and ability to produce hydro-electricity. The invention being proposed to dredge deep sediments from reservoirs operates on the principle of using gaseous fuel from an external pipeline or collected methane emissions as fuel for a submersible internal combustion slurry system. The invention combines the features of an internal combustion liquid piston engine with a slurry turbine driving a dredging cutter. Slurry entering into the system forms a column that is set in oscillation through the explosion of air and fuel and is then pumped to shore.

A method of exposing a buried utility under a roadway by cutting an access hole in the roadway, vacuuming away dirt surrounding the buried utility, and spraying at least one of pressurized water or compressed air into the dirt to loosen the dirt. A vacuum device having a vacuum nozzle, a compressed air nozzle, and a pressurized water nozzle.

A harvesting unit with one or more pumps including one or more suction nozzles directed towards the seabed, one or more inlets that lead from the suction nozzle to the pump, an outlet to a sorting device, one or more motors for driving the one or more pumps, where the sorting device, which at least separates bottom-dwelling marine organisms from bycatch and foreign bodies, has an outlet for bottom-dwelling marine organisms leading to a collecting unit, a structural main frame that carries at least the harvesting unit, and a towing and launching system for deployment and propulsion of the harvesting unit.

The present invention relates to a system and method for uncovering and removing pipeline from the seafloor using a subsea trenching system using pressurized water to uncover pipe, a subsea shear carried by a barge to cut lengths of the pipeline, and a grapple carried by a barge to lift cut lengths of pipeline for placement on a pipe haul and recovery barge.

The invention relates to a suction excavator having a vehicle chassis, a suction fan, and a dumpable material collection container. The material collection container has a collection chamber and is swivelable about a tilt axis that extends parallel to the vehicle longitudinal axis, between a working position and an emptying position. Furthermore, a filter unit is provided which is situated in a filter chamber in the material collection container and through which suction flow passes. The filter unit is rotatably mounted on a rotational axis that extends parallel to the tilt axis of the material collection container, wherein in an unlocked state, swiveling of the filter unit about the rotational axis is enabled in order to swivel the filter unit out of the filter chamber, at least in sections.

“There is disclosed an excavation apparatus (5), such as an underwater excavation apparatus, having means for producing, in use, at least one vortex, spiral or turbulent flow in a laminar flow of fluid, e.g. water. The excavation apparatus (5) comprises a rotor (10) having a rotor rotation axis (A), wherein, in use, flow of fluid passedpast or across the rotor (10) is at a first angle (α) from the axis of rotation (A). The excavation apparatus (5) comprises the rotor (5) and means or an arrangement for dampening reactive torque on the apparatus (5) caused by rotation of the rotor (10), in use. The turbulent flow is provided within, such as within a (transverse) cross-section, of the laminar flow.”

“There is disclosed an excavation apparatus (5), such as an underwater excavation apparatus, having means for producing, in use, at least one vortex, spiral or turbulent flow in a laminar flow of fluid, e.g. water. The excavation apparatus (5) comprises a rotor (10) having a rotor rotation axis (A), wherein, in use, flow of fluid passedpast or across the rotor (10) is at a first angle (α) from the axis of rotation (A). The excavation apparatus (5) comprises the rotor (5) and means or an arrangement for dampening reactive torque on the apparatus (5) caused by rotation of the rotor (10), in use. The turbulent flow is provided within, such as within a (transverse) cross-section, of the laminar flow.”

An extraction/grouting device which includes a fluid conduit having a longitudinal extent along a longitudinal axis, a pivoting wand and at least one cutting nozzle. The nozzle being in fluid communication with the fluid conduit. The cutting nozzle being coupled to the pivoting wand that is pivotably extendable relative to the longitudinal axis.

A beach umbrella with a built-in sand hole digging apparatus. The digging apparatus includes a tube and a piston. The tube includes an interior sidewall forming a hollow core. The tube further includes a top end forming a top opening and a bottom end forming a bottom opening. The piston includes an elongated rod. The elongated rod includes a top end protruding from the top opening of the tube. A head is attached to the bottom end of the piston. The head is disposed within the hollow core of the tube and is slidably engaged with the sidewall.

A dredge head assembly is disclosed. The assembly includes: a shroud having a generally open bottom end and a top end; a screen structure covering the generally open bottom end of the shroud; a suction pipe with a first end connected to the top end of the shroud and a second end configured to be operatively connected with a pump which induces suction; a handle connected to and extending from the shroud and having at least one grasping portion; and one or more vacuum relief valve assemblies, each comprising a valve, at least one opening configured to be in communication with water, and an actuation mechanism positioned to be accessible to a diver. Dredging systems and methods of dredging are also disclosed.