JPH0333864B2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to an inclined automatic excavation type dredging method in which a sand layer at the bottom of the water is excavated and dredged by reciprocating a finned dredging pipe body up and down. It is something. (Prior art) As shown in Fig. 8, this type of conventional pot dredging method is such that a turret is provided on the hull of the ship, and a rolling wheel is attached to the turret so that it can move up and down. The car is suspended by a winch cable, and the dredging hose body consists of a dredger's sand removal suction hose and a stirring pressure water hose with several nozzles extending toward the tip. Hang the end on the wheel and let the tip hang down. Then, the worker manually operates the winch continuously from start to finish, lowers the wheels one by one , lowers the tip of the dredging hose body, and removes the sand layer at the bottom of the water by spraying water from the nozzle. Work is carried out by stirring the sand and sucking it up with a suction hose. (Problems to be solved by the invention) In the conventional dredging method described above, (1) the worker has to manually operate the winch continuously from start to finish, which causes the worker to use his or her nerves and suffer from great fatigue; be. (2) Since the worker does not know whether the tip of the suction hose has touched the sand or not, and the amount of suction at the tip of the suction hose, the worker must operate the winch appropriately to remove the dredging hose body . The tip of the is intermittently lowered. Therefore, when the dredging hose is lowered, the sand near the suction port of the suction hose is immediately sucked in, and thereafter only water is sucked in repeatedly, resulting in poor work efficiency. (3) The dredging hose body simply hangs down and descends.
Due to the lack of lateral movement, (a) the dredging area at one location is narrow; (b) The dredging position must be moved throughout the work. Therefore, work efficiency does not improve. There are problems with these points. (Means for Solving the Problems) Therefore, in order to solve the above-mentioned conventional problems, the present invention increases the moving speed of the dredging pipe body and does not allow the dredging pipe to move near the suction port of the suction pipe for sand removal. Focusing on constantly supplying the amount of sand commensurate with the dredging capacity, a rigid dredging pipe body with sand raking fins uses its own weight to constantly move up and down in close contact with the sand layer surface, and the required amount of sand is supplied by the sand fins. At the same time, excavated sand is poured into the suction port of the sand removal suction pipe. That is, the pressure water pipes 2 and 3 are arranged in parallel on both sides of the sand removal suction pipe 1, and the suction pipe 1 and both pressure water pipes 2, 3 and its suction pipe 1
An eductor ring pipe 28 and a stirring ring pipe 29 are arranged above and below each other at a position slightly above the suction port at the tip of the eductor ring pipe 28, and a gravel ring pipe 32 is installed concentrically above the eductor ring pipe 28, respectively.
Eductor ring pipe 28, stirring ring pipe 2
9. Connect either of the two pressure water pipes 2 and 3 to the sand-sliding ring pipe 32 as appropriate, and connect several nozzles 30 to the eductor ring pipe 28 facing diagonally upward and inward and facing into the suction pipe 1. A dredging pipe body a is constructed by disposing several nozzles 31 directed downward in the stirring ring pipe 29 and several nozzles 33 directed outward in the sand-breaking ring pipe 32 at appropriate intervals. Then, the base of the dredging pipe body a is suspended from the hull A, the tip is placed on the sand layer B at the bottom of the water, the dredging pipe body a is tilted, and the hanging portion at the base of the dredging pipe body a is moved up and down and back and forth. drive (Function) The dredging pipe body a reciprocates up and down in the axial direction due to its own weight, excavates the surface of the sand layer B in an inclined manner with the fins 4, and suctions and discharges the sand with the suction pipe 1, while
The dredging pipe body a sequentially rotates and descends using the hanging portion at its base as a fulcrum to perform dredging work over a certain section from an inclined state to a vertical state. (Example) To explain the structure of one embodiment of the present invention shown in FIGS. 1 to 6, A indicates the hull of a tilting automatic excavation type dredger, and 5 is mounted on the front part of the hull A. Using a two-drum winch for the dredging pipe body a, cables 8 and 9 are wound around the front and rear drums 6 and 7, respectively. 10 is a motor connected to the front drum 6 by a transmission mechanism (not shown). 11 and 12 are hanging pillars protruding outward from the front and back of one side of the hull A, 13 and 14 are pulleys mounted in parallel in front of the winch 5, and 15 and 16 are pivotally supported at the front of one side of the hull A. A forward pulley, 17 is a rear pulley pivotally supported at the middle part of one side of the hull A, 18 is a movable pulley, 19,
Reference numerals 20 and 21 indicate pulleys that are pivotally supported at the base, middle, and tip of the front suspension column 11, respectively. Therefore, the cable 8 let out from the front drum 6 is sequentially hooked onto the pulleys 13, 15, 17 and the movable pulley 18, and its tip is fixed to the stop arm 22 of the rear pulley 17, and the attachment arm that pivotally supports the movable pulley 18. The cable 24 whose base end is fixed to the pulley 23 is sequentially hooked onto the pulleys 19, 20, and 21, and its tip end is suspended from the pulley 21. On the other hand, the cable 9 let out from the rear drum 7 sequentially passes through pulleys 14, 16,
Although not shown, the distal end portion is suspended from the distal end pulley of the rear suspension column 12 by hanging on a pulley provided on the rear suspension column 12 in the same manner as the pulleys 19, 20, 21 of the front suspension column 11. Reference numerals 25 and 26 indicate switches such as proximity switches provided before and after the movable pulley 18. Although not shown, the switches 25 and 2 before and after the movable pulley 18 are
6 and the switch of the motor 10, if the movable pulley 18 faces the front switch 25, the motor 10
When the switch is turned on and the movable pulley 18 faces the rear switch 26, an electric circuit is formed in which the motor 10 is turned off. A is the dredging pipe body, which consists of a suction pipe 1 for sand removal and pressure water pipes 2 and 3 on both sides of the suction pipe 1, and these pipes 1, 2,
3 are arranged close to each other in parallel and fixed by several pipe bands 27 arranged at appropriate intervals, and a sand fin 4 is provided at the center of the lower surface of the pipe bands 27. 28 and 29 are small-diameter eductor rings arranged vertically in a position slightly above the suction port at the tip of the suction pipe 1 (hereinafter, the direction of the tip of the dredging pipe body a is referred to as downward, and the opposite direction is referred to as upper). pipe and a large-diameter stirring ring pipe, and the ring pipe 2 for the eductor.
The tip of the pressure water tube 2 is connected to the ring tube 8 for stirring, and the tip of the pressure water tube 3 is connected to the ring tube 29 for stirring.
The three nozzles 30 facing inside are connected to the stirring ring pipe 2.
9 is provided with five nozzles 31 directed downward and slightly diagonally inward. Reference numeral 32 denotes a sand-sliding ring pipe attached to the suction pipe 1 at an appropriate position above the eductor ring pipe 28. Although not shown, the sand-sliding ring pipe 32 is connected to the pressure water pipe 3 through an appropriate branch pipe. is provided with four nozzles 33 directed diagonally downward and outward. Reference numeral 34 denotes a reinforcing pipe that is fitted into the suction port of the suction pipe 1 and serves as a suction restriction. The pipe bands 27 at the base and tip of the dredging tube body a are attached to the tips of the cables 24 and 9, respectively, and the dredging tube body a is suspended by the cables 24 and 9. On the other hand, the base ends of the suction pipe 1 and pressure water pipes 2 and 3 of the dredging pipe body a are connected to the dredging pump 3 on the hull A via connecting hoses 35, 36, and 37 of appropriate length.
8 and a high-pressure water pump 39, and the base end of the sand discharge pipe 40 is connected to the discharge port of the dredging pump 38. The tip of the sand discharge pipe 40 faces the ground. 4
Reference numeral 1 denotes protective cables for the connection hoses 35, 36, and 37 (marked in Figure 1), and both ends are attached to the hull A and the tips of the cables 24, respectively. 42 and 43 are two-drum winches for front and rear mooring that are mounted on the front and rear of the hull A, and cables 44 and 45 are wound around them, respectively. B is the sand layer at the bottom of the water. Next, its effect will be explained. When the winch 5 is operated and the dredging pipe body a is lifted by the cables 24 and 9, the dredging pipe body a is suspended and stored on the side of the hull A, as shown by the chain line at the top of Fig. 1. Ru. Therefore, when carrying out dredging work, the sand discharge pipe 40
With the tip facing the ground, the hull A is propelled to a required location, and the front and rear winches 42, 43 are operated to moor the hull A with the cables 44, 45 as shown in FIG. Next, when the rear drum 7 of the winch 5 is unlatched, the cable 9 is automatically let out from the rear drum 7 by the weight of the dredging pipe body a, and the dredging pipe body a uses the hanging portion at its base as a fulcrum. As shown by the solid line in FIG. 1, the cable 9 becomes slack and the tip of the dredging pipe body a rests on the sand layer B, tilting backward and downward. On the other hand, when the pumps 38 and 39 start operating,
High pressure water is connected to hoses 36, 37 and pressure water pipes 2, 3.
The suction force is generated at the suction port of the suction pipe 1 by the jet of high-pressure water from the nozzle 30 and the suction action of the pump 38 . Therefore, when the electric circuit to the motor 10 is closed and the front drum 6 of the winch 5 is unlocked, the base of the dredging pipe body a is lifted up and the movable pulley 18 is positioned at the rear end, as shown by the solid line in FIG. In this state, the power to the motor 10 is cut off, so the dredging pipe body a
The weight of the cable 8 of the front drum 6 is let out, the movable pulley 18 moves forward, and the base of the dredging pipe body a descends.Accompanyingly, the dredging pipe body a slides on the sand layer B and moves diagonally in the direction of its axis. Move backwards and downwards. When the movable pulley 18 moves forward to the position shown by the chain line in FIG. Since it is wound up, the movable pulley 18 moves backward and lifts the base of the dredging pipe body a with the cable 24, and as a result, the dredging pipe body a slides on the sand layer B and moves diagonally forward in the direction of its axis. Move upward. Next, as shown by the solid line in Fig. 3, the dredging pipe body a
When the movable pulley 18 reaches the rear end position after being lifted up, the switch 26 acts to stop the power supply to the motor 10 and the front drum 6 is in an idle state. front drum 6
While the rope 8 is let out and the movable pulley 18 moves forward, the base of the dredging pipe body a is lowered, and the above-mentioned action is then automatically repeated one after another. Therefore, the dredging pipe body a automatically reciprocates up and down in the axial direction while resting closely on the sand layer B in an inclined state due to its own weight, and during this up and down reciprocation, the fins 4 sequentially move the sand layer B Scratch and excavate the surface. On the other hand, the water jet from the nozzle 31 mixes the sand and water near the suction port of the suction pipe 1 to make it easier to suck the sand, and the water jet from the nozzle 33 prevents the sand on both sides of the dredging pipe body a from collapsing. The excavated sand is sucked into the suction pipe 1 from the suction port of the suction pipe 1 along with water, and the suction pipe 1, the hose 35, the pump 38,
The sand passes through the sand discharge pipe 40 and is discharged to the ground from the tip of the sand discharge pipe 40. At this time, as the dredging work progresses, the dredging pipe body a automatically rotates downward by its own weight from the state shown by the solid line in Figure 1 to the bottom as shown by the chain line, using its base as a fulcrum. The excavation is performed while entering the sand layer B, and the work is continuously carried out while the excavated sand is constantly being supplied to the vicinity of the suction port of the suction pipe 1. When the dredging pipe body a reaches the vertical state, the winch 5 is operated to store the dredging pipe body a as shown by the chain line at the top of FIG.
is operated to move and moor the hull A, and at that position, the dredging pipe body A is again tilted as shown by the solid line in FIG. 1 by operating in the same manner as described above, and continuous work is started. Hereinafter, the dredging work will be carried out by repeating the operation of sequentially moving the hull A and performing continuous work on one section, with the period between the dredging pipe body A starting from the inclined state shown by the solid line in Fig. 1 and reaching the vertical state as one section. continue. Another embodiment of the present invention shown in FIG. 7 shows a case where the water depth is deep and the dredging pipe body is long. If the structure is explained with reference to the drawing, C is a barge for the tip of the dredging pipe body a'. , is indexed to the rear of the hull A by a cable 46, and on the barge C, a hanging post 47 is provided as in the hull A, and a winch 48 for the dredging pipe body a' and the like are mounted. Reference numeral 49 denotes a cable wrapped around the winch 48, which, although not shown, is wrapped around the barge C and the pulley of the hanging column 47, similar to the cable 9 in the above embodiment, and is wound from the tip of the hanging column 47. Dredge pipe band 27 at the tip of dredging pipe body a′
Install. 50 is a cable for mooring the barge C at the rear. Other symbols indicate the same parts as in FIGS. 1 to 6. Next, its effect will be explained. As shown by the solid line in FIG. 7, the dredging pipe body a' is stored on the hull A and the barge C, and the hull A is propelled to the required location. Therefore, after pulling the cable 46 to bring the barge C into the state shown by the chain line in FIG. As shown by the solid line in FIG. 1, the tip rests on the sand layer B and is inclined backward and downward. Therefore, if the barge C is returned to the state shown by the solid line in FIG. 7 and the front and rear of the hull A with the barge C is moored with cables 44 and 50 as shown in FIG. Can be operated to perform work. (Effects of the Invention) The inclined automatic excavation type dredging method of the present invention has the following remarkable effects. (1) The base of the dredging pipe is suspended and the tip is placed on the sand layer at the bottom of the water, and the dredging pipe is tilted and the base is driven back and forth up and down, so the dredging pipe does not become strained. In the inclined state, the suction port slides in close contact with the sand layer surface and reciprocates in the axial direction automatically, lightly and smoothly. (2) Provide several sand fins on the dredging pipe body, and
We have provided a ring pipe for the eductor, a ring pipe for stirring, and a ring pipe for sand-sliding, and installed nozzles on them, so that the dredging pipe body makes vertical and reciprocating movements, and the sand fins of the dredging pipe body can remove the sand layer at the bottom of the water. Scratch and excavate the surface. On the other hand, the water jet from the nozzle of the stirring ring pipe mixes the sand and water near the suction port of the suction pipe, and the water jet from the nozzle of the sand-breaking ring pipe promotes the collapse of sand on both sides of the dredging pipe body. The sand is sucked and discharged by the water jet from the nozzle of the eductor ring pipe and the suction action of the dredging pump, so the sand in the sand layer where the dredging pipe body is located is smoothly and well broken up, and the inlet of the suction pipe is constantly excavated. The dredged sand is supplied in a state where it is easy to suck, improving dredging efficiency and improving work efficiency. (3) As the dredging work progresses, the dredging pipe body automatically rotates downward using its own weight around the hanging part at its base as a fulcrum, and the dredging pipe body starts from an inclined state and reaches a vertical state. In addition to continuous work being carried out until the end of the day, it takes a long time to work on that one section. Therefore, while working on that one section, the worker only has to watch the intake state of the dredger and does not need to perform any operations, so the worker is less fatigued even during long hours of work, saving time and effort. Improve work efficiency. (4) A ring pipe for the eductor is provided, and sand, etc., is blown into the water suction pipe by water jets from several nozzles directed diagonally upward and inward, so the nozzles do not get in the way and remove debris scattered in the water. Objects, tree roots, etc. can be sucked into the suction tube smoothly and well. (5) Sand fins were installed on the pipe band that connects the suction pipe and the pressure water pipes on both sides at appropriate intervals.
The pipe band is reinforced by the sand fins and becomes strong, and the connecting portion between the suction pipe and the pressure water pipe becomes strong, making it possible to construct a strong dredging pipe body. (6) It is simple to configure and easy to operate.

[Brief explanation of drawings]

FIG. 1 is a side view of a tilting automatic excavation type dredger showing one embodiment of the present invention, FIG. 2 is a plan view, and FIG.
The figure is a perspective view of the operating portion of the dredging pipe, and FIG. 4 is a rear view of the tip of the dredging pipe, partially cut away. FIG. 5 is a side view, FIG. 6 is a cross-sectional view taken along the line -- in FIG. It is a side view of a digging dredger. A...hull, B...sand layer, a...dredging pipe body, 1
... Suction pipe for sand removal, 2, 3 ... Pressure water pipe, 4 ...
Sand fin.

Claims (1)

[Claims] 1 Pressure water pipes are arranged in parallel on both sides of the suction pipe for sand removal, and the suction pipe and both pressure water pipes are connected at appropriate intervals by several pipe bands with sand fins provided at the bottom, and the tip of the suction pipe is An eductor ring pipe and a stirring ring pipe are arranged one above the other at a position slightly above the inlet of the eductor, and a sand-breaking ring pipe is installed concentrically above the eductor ring pipe, and the eductor ring pipe, Either of the above-mentioned pressure water pipes is connected to the stirring ring pipe and the sand-breaking ring pipe as appropriate, and the eductor ring pipe has several nozzles facing diagonally upward and inward and facing into the above-mentioned suction pipe. A dredging pipe body is constructed by arranging several nozzles directed downward in the stirring ring pipe and several nozzles directed outward in the sand-breaking ring pipe at appropriate intervals. A tilting type characterized in that the base of the dredging pipe body is suspended from the hull and the tip is placed on the sand layer at the bottom of the water so that the dredging pipe body is tilted, and the hanging portion at the base of the dredging pipe body is driven to reciprocate up and down. Automatic excavation type dredging method.