The invention relates to an excavation installation, comprising excavation means (1,2) in which more than one excavation means (1,2) is positioned offset next to another in a row (34,35) of excavation means (1,2). In use the excavation installation may excavate a horizontal bottom of water (102) in a direction that is perpendicular to the direction of the rows (34,35) of excavation means (1,2). The excavation means (1,2) are connected to a rigid construction, in which the rigid construction (3) is positioned vertically above the excavation means (1,2). The rigid construction (3) is resiliency connected to a bridge (5) that is positioned vertically above the rigid construction (3) and connected by means of actuators (7).

A method of dredging a bottom of a body of water is provided. Winching stations are positioned around the perimeter of an area to be dredged and a cable from each winching station is connected to a float. The cables pass through a variable resistance pulley assembly attached to a submersible assembly having a cutter and a submersible pump and are tensioned to suspend the submersible assembly. The cutter and submersible pump are activated and the winches are controlled to move the submersible assembly in a dredging pattern. When an obstacle is encountered the resistance of the pulley assembly is decreased and sufficient tension is applied to the cables to lift the submersible assembly toward the float.

A machine for extinguishing fires, using materials that are excavated and thrown directly from the ground includes a brush cutting module with knives and lateral panels, an excavating module comprising a cutter with spikes, and a throwing module formed by a flywheel mounted on a rotary shaft and provided with radial blades, allowing the excavated material to be thrown through openings in the throwing module. The position of the openings can be adjusted and the excavated materials can be thrown in one direction or another.

A robot for pond desilting is provided, which includes a frame, a lead screw sliding table, and a suction pipe. An end of the frame is provided with a pressure-resistant cabin. A lead screw base is disposed on the lead screw sliding table. A rotary lead screw is disposed on the lead screw sliding table. The lead screw base is disposed on the rotary lead screw. Waterproof motors are disposed above the lead screw base, a pump body is disposed in the frame, and the suction pipe is disposed at an end of the pump body. When the robot is placed at the bottom of the pond, the motor inside the pressure-resistant cabin drives the power wheels to rotate, the power wheels drive the tracks to rotate around the power wheels, bearing wheels, and tension wheels, thereby driving the frame to move.

A slope trimming attachment includes a base, a first cutting device, a leveling mechanism and a turning mechanism. The first cutting device and the leveling mechanism are respectively arranged on the turning mechanism. The turning mechanism is rotatably arranged on the base and is configured to be able to adjust an angle of the cutting surface of the first cutting device relative to the slope surface and an angle of the leveling surface of the leveling mechanism relative to the slope surface through rotation. A working machine with the disclosed slope trimming attachment is not only convenient to operate, but also realizes the simultaneous execution of cutting, leveling and compacting operations on the slope surface, improves the construction efficiency of the slope surface trimming, and thereby ensuring the construction quality.

An underwater milling suction robot, and relates to the technical field of milling equipment. The underwater milling suction robot comprises a self-propelled platform. A jacking and slewing mechanism is arranged on a top surface of the self-propelled platform. A powerful milling suction actuator and an obstacle cleaning mechanism are arranged on the outer side of the jacking and slewing mechanism. The underwater milling suction robot also comprises an automatic control system. The self-propelled platform, the jacking and slewing mechanism, the powerful milling suction actuator and the obstacle cleaning mechanism are electrically connected with the automatic control system.

A watercraft propulsion system for moving a watercraft along a waterway having a bottom and a surface, wherein the watercraft presents a port side and a starboard side. The watercraft propulsion system comprises a boom assembly having a proximal end and a distal end, with the proximal end being rotatably coupled with the watercraft. The watercraft additionally comprises a wheel mounted to the distal end of the boom. The wheel includes at least one generally radially-extending blade assembly, with the blade assembly comprising a primary blade and a secondary blade. The secondary blade extends at an angle with respect to the primary blade so as to present a fluid channel between the primary blade and the secondary blade.

A cutterhead for dredging water-bed material from a body of water. The cutterhead comprises a shroud presenting a front margin for receiving water-bed material into an interior space of the shroud. The shroud additionally includes a port from which water-bed material can be removed from the interior space of the shroud. The cutterhead additionally comprises a rotatable cutterbar at least partially received within the interior space of the shroud. The cutterhead further comprises a debris guard positioned between the cutterbar and the port. The debris guard is operable to filter the water-bed material removed from the shroud through the port. At least a portion of the debris guard that faces the cutterbar includes a concave shape.

A cutterhead for dredging water-bed material from a body of water. The cutterhead comprises a shroud presenting a front margin for receiving water-bed material into an interior space of the shroud. The shroud additionally includes a port from which water-bed material can be removed from the interior space of the shroud. The cutterhead additionally comprises a rotatable cutterbar at least partially received within the interior space of the shroud. The cutterhead further comprises a debris guard positioned between the cutterbar and the port. The debris guard is operable to filter the water-bed material removed from the shroud through the port. At least a portion of the debris guard that faces the cutterbar includes a concave shape.

This invention relates to hydraulic engineering construction and can be used for deposit cleanup of river beds and channels. The object of the invention is to expand the arsenal of usable means for deposit cleanup and deepening of river beds, develop a method and create a device that uses the speed of the river current in the most effective way. The technical result of the claimed method is simplification and optimization of one existing method for cleanup of river beds and channels, increasing its functionality. The proposed method implements a movable water flow-restricting device with flow-guiding elements that creates a concentrated stream and directs it to a washout zone, bound by side walls, roof and washout surface.