JPS6121238A - Dredger - Google Patents

Abstract

PURPOSE:To enable elevation of a head in response to depth in water, by a method wherein a suction hose and a jet hose are coupled to a suction head and a jet ejector, both located in water, through a take-up reel slidable over a ship hull. CONSTITUTION:A dredger is provided at the front of a ship bottom part with a jet pump 4 for injection excavating water and a sand pump 1 for sucking excavation mud water. The jet pump 4 and the sand pump 1 are coupled to a jet ejector 10 and a suction head 9, both located in water, through the medium of a jet hose 5 and a suction hose 3 through winding of a hose reel 6 slid in the longitudinal direction of a ship hull. Further, a sand pump 1 causes carriage of excavation mud water through a discharge pipe 2 to the outside of a ship. This enables easy movement of a suction head through sliding of the hose reel depending upon a dredging depth.

Description

[Detailed Description of the Invention] (a) Industrial Application Field This invention is a dredger that is used for improving port facilities and collecting aggregate by sucking and discharging sediment from the seabed and the bottom of rivers and swamps, especially equipped with a jet ejector. This relates to a sand pump type dredger.

(b) Conventional technology A sand pump type dredger equipped with a jet ejector digs up the water bottom with a jet stream ejected at high pressure from the tip, and the sand is sucked up to the ship using a sand pump installed on the ship. Although the ladder suction method as shown in FIG. 4 is the most common method, there is also a method in which a flexible suction hose is wound around a take-up reel 16 installed on board the ship. For example, Fig. 5 is a diagram of an embodiment shown in Japanese Patent Publication No. 51-2734, and such a system is also found in examples of Japanese Patent Publication No. 45-7829 and Japanese Utility Model Publication No. 55-39014. It appears to be quite popular.

(c) Problems to be solved by the invention Recently, with the increase in the capacity of sailing vessels, specifications with large dredging depths have become common, and even when collecting aggregate for civil engineering construction structures, collecting conditions are gradually becoming worse at deep places. I have been forced to move to

Traditionally, there are two factors that prevent deep dredging.
One of the problems is that due to the characteristics of the pump, there is a certain limit to the suction head, and at depths that exceed this limit, the pump efficiency deteriorates and construction becomes impossible.

However, this factor was almost solved by interposing a submersible sand pump in the middle of the suction pipe in addition to the sand pump installed on board the ship. Another driving factor remains the structural problem of the ship.

In other words, in the rudder suction system that is the mainstream, the rudder 15 must be lengthened in order to enable deep dredging, and in order to do so, the hull must be made larger, otherwise the ship will be unstable and pose a danger to waves. arise. Further, if the slope of the rudder 15 in the water is large, it is necessary to take a large swing angle during dredging work, resulting in a disadvantage of reduced efficiency. On the other hand, the method of winding the hose does not cause structural instability, but since the hose is wrapped over a flexible hose, there is a problem that the outer surfaces of the hoses rub against each other and cause a lot of wear and tear. be. Furthermore, since the length of the hose is constant, in shallow water areas it is necessary to dredge with the hose wrapped around the reel, and the hose wrapped at the bottom of the reel is wrapped above it. The hose becomes flattened into an oval shape due to its own weight and the weight of the earth and sand, and often bursts.

In order to solve the above-mentioned problems, the purpose of this invention is to provide a dredging vessel capable of deep dredging, which is structurally stable and which does not require winding up hoses in layers. shall be.

(d) Means for Solving Problems In the dredging vessel according to the present invention, the discharge side of the sand pump is connected to a discharge pipe, and the suction side of the sand pump and the pressure side of the jet pump are connected to the jet through a flexible hose. connected to a suction head equipped with an ejector,
A hose reel that can rotate and run on rails laid on the ship over almost the entire length of the ship is installed, and two flexible bows connected to the sand pump and jet pump are wound around this hose reel to control the direction. The problem was solved by inverting it and connecting it to the top of the saccillin head.

(f) Function: In the dredging vessel of the present invention, the hose reel is kept at one longitudinal end of the vessel while the vessel is moving to a destination or when dredging work is not in progress. Two visible hoses connected to the sand pump and the jet pump, respectively, are wound around a hose reel that is located at one end of the ship, reverse direction, and extend to the other longitudinal end of the ship and are located at the other end. At the beginning of the process, the suction head, together with the jet ejector and other attached parts, is allowed to sink into the water under its own weight, and the flexible hose that is let out into the water by this settling force pulls the hose reel toward the other end. shall be. The hose reel rotates on a rail laid on the ship over the entire length of the ship and travels toward the other end, and this action stops when the suction head reaches the bottom of the water for dredging. When the sand pump and water pressure pump start operating in this state, a high-pressure jet stream is ejected through one hose, digging up the bottom of the water, and the work begins by sucking up the sand onto the ship through the other hose.

(g) Examples Embodiments of this invention will be described based on the drawings.

In FIGS. 1 to 3 A and B, 1 is a sand pump and is a single-suction single-stage centrifugal pump made of wear-resistant material, and its discharge port 1a is connected to a discharge pipe 2 leading to the outside of the ship.
The suction port 1b is connected to a flexible suction hose 3 via a steel pipe. 4 is a jet pump, and in this example, a single suction 3yJt turbine pump is used. The jet pump 4 is connected to a flexible jet water hose 5 via a steel pipe.
It is connected with. For these flexible hoses, it is desirable to use rubber that can withstand high pressure and has excellent weather resistance, abrasion resistance, and aging resistance. Reference numeral 6 denotes a hose reel, which is ring-shaped and has two grooves on its outer circumferential surface into which the hose is inserted.

The rotating shaft of the hose reel 6 is rotatably supported by a bearing fixed to the upper part of the reel truck 7. At least four wheels are attached to the lower part of the reel truck 7, and the reel truck 7 can run on rails 8 laid over almost the entire length of the ship. Reference numeral 9 denotes a suction head, which has a cylindrical shape, and jet ejectors 10 that eject high-pressure water are opened at several locations around the suction head. 11 is a submersible sand pump, and 12 is its drive motor. Nowadays, dredging is required at high depths that cannot be sucked in by a single sand pump, so as in this example, a submersible pump is attached to the top of the suction head, and the jet ejector sucks in the excavated sand and carries it on board. It is now often pumped to more distant destinations using sand pumps onboard ships. The submersible sand pump 11 employs a vertical one-stage high volume pump, and the suction side is connected to the suction head 9, and the discharge side is connected to the suction hose 3. 13 is a drive motor 12 from the suction head 9
13a is the winch that lifts up. On the other hand, the reel truck 7 is equipped with a hydraulic winch (not shown) that always acts to the left in the figure, and controls the overall balance and movement of the truck. Reference numeral 14 denotes a carrier roller disposed in the longitudinal direction on the ship, which rotates when the two hoses move to assist in their movement.

Other equipment necessary to operate as a dredger,
For example, it shows the positional relationship of the ship handling winch, operation room, accommodation room, and each part when dredging work is not being performed, and
Figure B shows a state in which the vessel is engaged in dredging work, with the hose reel 6 running from one end of the ship to the other, and submerging the suction head to a desired position.

(h) Effects of the Invention The dredging vessel of this invention does not have a long rudder holding part (rudder block) that protrudes out of the vessel unlike the conventional rudder suction system, and is extremely stable. Dredging to great depths is possible. In the above example, the total length of the ship is 48 m, the width is 8 m, and the depth is 2.25 m.
It has a drainage capacity of 1.15 m and a full capacity displacement of approximately 295 tons, but it is capable of suctioning and discharging more than 120 rrr of earth and sand per hour from the deepest 100 m of water. By the way, almost the same captain.
It is said that a depth of 20 to 30 meters is the limit for stable operation of a rudder suction dredger with a wide hull.

In addition, unlike the conventional hose winding method, there is no need to wrap the hose over the hose, so safe work is ensured without significant wear and tear on the hose or deformation or bursting due to the load.

[Brief explanation of the drawing]

FIG. 1 is a front view of an embodiment of the present invention, FIG. 2 is a plan view thereof, and FIGS. 3A and B are schematic front views showing the operation of the embodiment.
4th FXJ is a front view of the prior art, and FIG. 5 is a plan view of another prior art. 1... Sand pump, 2... Exhaust pipe, 3... Suction hose, 4... Jet pump, 5... Jet water hose, 6... Hose reel, 8... Rail, 9... Suction head, 10... Jet ejector-1 15... Ladder of prior art, 16... Take-up reel of another prior art.

Claims (1)

[Claims] The discharge port side of the sand pump 1 is connected to a discharge pipe 2, and the suction port side of the sand pump 1 and the pressure sending side of the jet pump 4 are connected to a suction head 9 equipped with a jet ejector 10 via flexible hoses 3 and 5, respectively. In a dredging vessel that is connected to Book flexible hoses 3 and 5
A dredger boat for high-depth dredging which is connected to the upper part of the suction head 9 by winding the winding and reversing the direction.