Classifications

• • E—FIXED CONSTRUCTIONS
  • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
  • E02F—DREDGING; SOIL-SHIFTING
  • E02F3/00—Dredgers; Soil-shifting machines
  • E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
  • E02F3/88—Dredgers; Soil-shifting machines mechanically-driven with arrangements acting by a sucking or forcing effect, e.g. suction dredgers
  • E02F3/8833—Floating installations
  • E02F3/8841—Floating installations wherein at least a part of the soil-shifting equipment is mounted on a ladder or boom
• • E—FIXED CONSTRUCTIONS
  • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
  • E02F—DREDGING; SOIL-SHIFTING
  • E02F3/00—Dredgers; Soil-shifting machines
  • E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
  • E02F3/88—Dredgers; Soil-shifting machines mechanically-driven with arrangements acting by a sucking or forcing effect, e.g. suction dredgers
  • E02F3/90—Component parts, e.g. arrangement or adaptation of pumps
  • E02F3/92—Digging elements, e.g. suction heads
  • E02F3/9212—Mechanical digging means, e.g. suction wheels, i.e. wheel with a suction inlet attached behind the wheel
• • E—FIXED CONSTRUCTIONS
  • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
  • E02F—DREDGING; SOIL-SHIFTING
  • E02F5/00—Dredgers or soil-shifting machines for special purposes
  • E02F5/006—Dredgers or soil-shifting machines for special purposes adapted for working ground under water not otherwise provided for
• • E—FIXED CONSTRUCTIONS
  • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
  • E02F—DREDGING; SOIL-SHIFTING
  • E02F5/00—Dredgers or soil-shifting machines for special purposes
  • E02F5/28—Dredgers or soil-shifting machines for special purposes for cleaning watercourses or other ways
• • E—FIXED CONSTRUCTIONS
  • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
  • E02F—DREDGING; SOIL-SHIFTING
  • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
  • E02F9/06—Floating substructures as supports
  • E02F9/062—Advancing equipment, e.g. spuds for floating dredgers

Definitions

• the invention relates to a suction dredger apparatus in which the dredger pump is located in a movable boom mounted on a base.
• a dredger apparatus of today normally includes a floating base, and a rotating chopper is fastended at the end of a folding boom mounted on the base. The axis of the chopper is essentially vertical. Also a suction pump is located on the base, and the suction end of its suction pipe is located in the vicinity of the chopper. The material loosened by the chopper is sucked up by the pump, and it is led for instance to a barge or on land.
• One problem in this kind of apparatus is the fact that besides the material to be dredged, a considerable volume of water has to be transferred which impairs the efficiency of the apparatus and makes the separation of solid material more difficult.
• Patent publication FI 53 477 C discloses also an apparatus in which the chopper is a screw rotating around a horizontal axis and in which a shieldlike plate is placed on the screw in order to lead the loosened material to the mouth of the suction pipe.
• this apparatus is very complicated and expensive but rather limited in its function.
• Patent publication US 3 774 323 again discloses an apparatus where the suction pump is rigidly fastened to the end of a boom moving only in vertical direction in such a way that the suction direction is parallel to the boom.
• the driving engine of the pump is located in the vessel.
• the effeciency of this apparatus is poor.
• the apparatus is awkward to use because when dredging, the vessel has to be moved forward almost continuously. Even in this way, only a very narrow groove can be dredged.
• the dredger pump is located in a scoop movably mounted at the end of a boom arrangement, the suction opening being inside the scoop. In this way, the suction direction of the pump is always changed with the movement of the scoop, and unnecessary pumping of water can be avoided.
• the boom arrangement is preferably a folding boom arrangement so that a fairly long area can be dredged from one anchoring site forward.
• the boom arrangement is preferably still laterally movable, a fairly wide sectorlike area can be dredged from one anchoring site.
• the driving motor of the pump is preferably a hydraulic motor which is located with the pump in the scoop.
• the apparatus now invented can reach good efficiency but still the apparatus is very simple.
• the apparatus is also flexible in use; it can easily be modified according to different dredging tasks, and also other tools can be connected to it.
• Fig. 1 shows a side view of a dredger vessel.
• Figs. 2 and 3 show a front view and top view of the scoop of the apparatus.
• Figs. 6 and 7 show the scoop of Figs. 4 and 5 modified into a hoe scoop, and
• Fig. 8 shows a dredger excavator.
• the main parts of the apparatus of Fig. 1 are a floating base 1, a hydraulic boom arrangement 2 mounted on it, a vertically pivoting scoop 3 placed at the end of the hydraulic boom arrangement, and a suction device 4 connected to the scoop.
• a motor as a power source and necessary controlling and steering devices have been placed in the vessel.
• the base has a turnable propeller, by means of which it can be moved and steered.
• the anchoring poles 5 At the other end (rear end) of the vessel, on the sides of the vessel, there are two anchoring poles 5 to be thrusted into the bottom.
• the anchoring poles can be placed lying on the deck.
• the support legs are mounted to the barge pivoting vertically. When lowered to the bottom, the support legs give sufficient support to the functioning of the apparatus.
• Containers increasing the buoyancy can be arranged in the support legs so that it is easier to lift the legs from the bottom mud.
• the scoop is fastened at the end of the boom arrangement by means of fast couplings 8.
• Two centrifugal pumps 9 are mounted on the scoop, horizontally side by side in such a way that the suction openings of the pumps are located inside the scoop.
• the outlet openings of the pumps are connected to a discharge pipe 10.
• Fig. 2 shows a front view of the scoop and suction device of Fig. 1
• Fig. 3 shows a top view.
• the scoop is formed by a rear plate 11, a lip plate 12 and two side plates 13.
• the rear plate and lip plate form a sharp angle inside the scoop.
• the upper edge 14 of the rear plate is bent forward.
• the upper part of the scoop is provided with fastening lugs 15 for fastening the scoop to the boom arrangement.
• Pumps 9 driven by hydraulic motors 16 are placed in the rear plate of the scoop so that the suction openings are directed forwards.
• a side guide plate 17 is placed in each corner formed by the side plate 13, lip plate 12 and rear plate 11, and centre guide plates 18 are placed in the middle of the scoop, between the lip plate, rear plate and the upper edge 14 of the rear plate in such a way that a convergent inlet passage is formed in front of each pump.
• the space remaining behind the guide plates is made water-tight. In this way, the buoyancy applied to the scoop has been increased which reduces the force required for moving the scoop in the water.
• the front edge of the lip plate 12 is provided with claws 19.
• the pumps 9 are provided in front of their suction openings with shredding blades 20 rotating with rotors.
• the scoop shown in Figs. 4 and 5 is formed by a rear plate 21, side plates 22 and a lip plate 23.
• the upper edge 24 of the rear plate is bent forwards and downwards in such a way that a kind of hood is formed.
• Pumps 25 are similar to the ones in the scoop of Fig. 2 but they are placed in the upper part of the rear plate so that the suction opening is directed downwards, towards the lip plate.
• Figs. 6 and 7 show the working of a scoop of the type shown in Figs. 4 and 5, arranged as a hoe scoop.
• the side plates 22 are still provided wich a front stopper 31 and rear stopper 32 which respectively define the front limit and the rear limit of the movement of the plate 27 and grate 28.
• the guide plate 27 and grate 28 are at the rear position.
• the guide plate prevents the direct flow of water into the suction openings of the pumps 25.
• the grate again prevents big stones and other pieces from entering the pump.
• the grate also cuts and disintegrates ground material. In order to make this more efficient, the front edge can be formed sharp.
• the scoop When the grate is desired to be emptied from the material sticking to it, the scoop is turned into an emptying position (Fig. 7), so that the guide plate and the grate are turned into their front position where the tips of the bars of the grate point directly downwards. In this way, the material remaining on the grate falls easily off.
• a hoe scoop is particularly suitable for dredging relatively hard ground material.
• a dipper shovel again is particularly suitable for removing soft or loose material.
• the scoop is moved with a suitable speed so that the material loosened by the scoop and disintergrated by the claws 19 and the grate 28 is carried to the pumps 9, 25, and further via the discharge pipe 10 to a desired place.
• the shredding device 20 of the pump disintegrates the material, particularly water plants and the like in it so that no blockages or disturbances are formed in the pump.
• the bent upper edge 14, 24 of the rear plate of the scoop, and the possible guide plate 27 of the screen prevent pure water from flowing directly to the pumps 9, 25 which makes the suction effect more efficient and improves the efficiency of the dredging.
• the scoop and the suction device can be mounted also on a boom arrangement of an excavator travelling on land.
• a boom arrangement of an excavator travelling on land In this way, shore waters or small subjects, such as canals or basings, can conveniently be dredged.
• Fig. 8 shows such an embodiment.
• the base is an excavator 32 travelling on caterpillar bands 31.
• the boom arrangement 2 corresponds to the one in Fig. 1
• the scoop 3' and the suction device 4 1 correspond to the ones in Figs. 4 and 5.
• the size and shape of the scoop can be made different according to the requirements of a specific dredging work in each case.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Mining & Mineral Resources (AREA)
• Civil Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Structural Engineering (AREA)
• Structures Of Non-Positive Displacement Pumps (AREA)
• Farming Of Fish And Shellfish (AREA)
• Load-Engaging Elements For Cranes (AREA)
• Cleaning Or Clearing Of The Surface Of Open Water (AREA)

Applications Claiming Priority (2)

Publications (2)

Family

ID=8522309

Family Applications (1)

Country Status (5)

Cited By (1)

Families Citing this family (9)

Family Cites Families (11)

• 1986
  • 1986-03-17 FI FI861101A patent/FI81864C/fi not_active IP Right Cessation
• 1987
  • 1987-03-17 WO PCT/FI1987/000035 patent/WO1987005649A1/en active IP Right Grant
  • 1987-03-17 EP EP19870902092 patent/EP0259472B1/de not_active Expired
  • 1987-03-17 HU HU871931A patent/HU201587B/hu not_active IP Right Cessation
  • 1987-10-27 DK DK562687A patent/DK156403C/da not_active IP Right Cessation

Non-Patent Citations (1)

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