JPH0323690B2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Fields At present, dam lakes for irrigation, water storage, and power generation are being constructed at great expense, and even dam lakes that are said to be effective for 100 years are now being constructed. The current situation is that their useful life is shortened because they are buried by sediment that accumulates day by day.

In order to prevent such a situation, various studies have been made to dredge the soil, but it is not practical to dredge the dam lake due to the geographical situation as well as the cost. It was even said that As a result, some dams have already become unusable due to the accumulation of earth and sand, and some dams have been resorted to constructing former dams upstream of the lake at great expense. but,
There are fewer and fewer places that meet the geographical conditions, and this is reaching its limit.

Therefore, under the above-mentioned circumstances, an effective dredging device for dam lakes is highly desired, and the object of the present invention is to provide a dredging device that can meet such demands.

Conventional technology Conventionally, in order to remove accumulated earth and sand, there are bucket dredging equipment that continuously scoops up the earth and sand using a bucket conveyor, grab dredging equipment that grabs earth and sand using a grab bucket, and other methods that cut down the earth and sand using a rotary cutter and suck it up with a pump. There was a pump dredging device for lifting the water.

However, dredging using a bucket conveyor has a limit to the depth of the water, and grab buckets, which are not affected by water depth, are inefficient because they require intermittent grabbing and lifting work. Pump dredging equipment was often used as a somewhat effective device, but the rudder itself was tilted down from the barge and lowered to the bottom of the water, and had a drilling device attached to its tip. (See Utility Model Publication No. 43981/1981). As a result, dredging equipment has become larger, and if the dredging point is farther from the barge, it is not suitable for narrow dam lakes.

Therefore, it has been considered to suspend a dredging pump with an excavator to the bottom of the water using a wire rope (see Japanese Patent Publication No. 56-29056). The dredging system as a whole became large because the water tube was heavy and had a complicated structure. Moreover, the dredging pump itself did not have good dredging efficiency and work efficiency.

Under these circumstances, various improvements were made to dredging by suctioning the dredged soil straight upwards from the water bottom using a water tube (Utility Model 57-
22556) was considered by the present inventors.

Problems to be Solved by the Invention However, in the pump dredging device supplied in this way, the lift pump at the lower end of the water tube that sucks in the earth and sand is in a stationary state, and the high-pressure injection pump that stirs and blows up the earth and sand is in a stationary state. Since the nozzle was also stationary, a mortar-shaped recess was formed at the bottom of the water when it began to operate, and the water pump and high-pressure injection pump were dug into it. However, the surrounding area collapsed, and the water pump and high-pressure injection pump were buried in the depression. If the pump continued to be driven under such conditions, an overload would occur and the pump would become stuck in the recess, making it impossible to suck up the sediment flow.

As a result, the water pump malfunctioned,
Despite this, if the water suction pump on the barge was being driven, negative pressure would develop inside the water pipe, causing problems with the water suction pump and the water pipe itself.

In addition, when it comes to moving work barges that move work areas, if a normal winch is used to wind up a long cable and simply pull it, the winch becomes larger, and the floating body of the barge also becomes larger to accommodate the weight. Also, the winch operation was not easy.

Therefore, in order to solve these problems, it is an object of the present invention to further improve and obtain a practical and effective dredging device for a dam lake.

Means for Solving the Problems The present invention consists of a barge comprising several floating bodies, a dredging mechanism for excavating with a high-pressure injection pump and pumping the excavated earth and sand with a sand pump, and A transport mechanism that transports the earth and sand water through a telescopic water tube suspended from a barge and sends the water to the sand and water separation/storage site on land, and a movement mechanism that moves the barge to move the dredging work position. This is a dredging device for a dam lake, and the transport mechanism is a water pipe suspended from a barge, and a water suction pump on the barge above.
A water pump is provided below, and a sand water pipe is provided on the discharge side of the water suction pump to send water to the sand/water separation/sand storage area on land. A surge tank is installed in front of the water suction pump on the work barge so that the water suction pump will not malfunction even if the water pump breaks down. This prevents the sand pump and the injection nozzle of the high-pressure injection pump from oscillating and becoming buried in the earth and sand. An endless winch is used to move the barge to facilitate positional movement during dredging work.

Hereinafter, as shown in the drawings, an axial flow pump 3 equipped with a surge tank 2 on the suction side is installed on a barge 1 consisting of several floating bodies 1a, as shown in FIG. A sand-feeding water pipe 4 is attached to the discharge side of the flow pump, and the sand-feeding water pipe 4 is supported by a support float 5 on the water surface, leading to a sand-water separation/sand storage area 6 on land. An intermediate cylinder 7 is connected to the bottom of the surge tank 2 on the barge, and a water guide cylinder 8 is connected and suspended from the lower open end of the intermediate cylinder 7 and suspended by a support cable 9. The water conduit 8 is a flexible bellows tube having a plurality of annular frames covered with polyester cloth coated with neoprene rubber, and is lightweight and strong. At the lower end of such a water pipe 8, an annular floating weight body 10 of appropriate self-weight is attached, and a continuation pipe 12 is attached to the lower end of the floating weight body via a swivel joint 11.
is continued rotatably, and a sand pump 13 is installed at the bottom of the continuation pipe at a swivel joint so that it can be rotated and reversed by an automatic swing mechanism. Furthermore, the legs of the three-legged leg body 15 are firmly supported by brackets 14 that protrude radially below the outer periphery of the weight body 10. A nozzle 17 from a high-pressure injection pump 16 installed above is connected to the sand pump 1 on the legs of the three-legged leg 15.
A swivel joint 1 is installed in the middle so that the jet can be effectively aimed at the bottom of the water near the bottom of the suction port 3.
It is designed to swing and rotate by an automatic swinging mechanism via 8.

In order for the above-mentioned dredging mechanism to reach a desired depth, the supporting cables 9 from the brackets 19 that protrude radially at equal intervals above the outer circumference of the dredging weight body 10 are let out by a synchronous differential winding trunk winch 20. , extend the water tube. The synchronous differential winding drum winch has a second
As shown in the figure, it consists of a large-diameter cylinder 20a and a small-diameter cylinder 20b, and the large-diameter cylinder is hung with a support cable, and the small-diameter cylinder is suspended with a counterweight 21 of a predetermined self-weight for adjusting the balance with the weight of the pedestal, such as an underwater dredging mechanism. The lowered suspension rope 22 is hoisted or let out, and the lifting and lowering of the counterweight 21 and the pedestal weight body 10 by the winch are reversible, and moreover, the counterweight is adapted to the diameter ratio of the hoisting drum. The stroke ratio is reduced. A counterweight with a predetermined self-weight is one that has a weight of a certain weight placed below and a hollow casing above it, and the weight can be adjusted to a predetermined value by filling the casing with water, sand, etc. It is something that can be done. Additionally, a buoyant body may be attached to the weight body 10 in place of the counterweight.

In addition, as shown in FIG. 2, the movement and positioning of the floating barge 1 of the moving mechanism is performed by a combination of several pairs of endless winches 23 mounted on the top surface of the barge and a tension roller 24 installed between them. The winch is operated from a single power source, synchronizing the circumferential speed of the front and rear winches, and moving and stopping at any desired position.As shown in Figure 3, both ends are fixed on land. A winch for winding and unwinding is placed in the middle of the cable 25, and the cable between them is suspended in the water. The tension roller 24 acts to bind the rope to the winding trunk of the endless winch 23 due to the weight of the rope hanging in the water, increasing the degree of binding and increasing the reliability of operation. This is to ensure that the barge can be parked at any desired position.

Next, the sand pump swing mechanism will be explained in detail with reference to FIGS. 4 and 5. A continuation pipe 12 and a sand pump 13 are continuously installed below the weight body 10 via a swivel joint 11. A rail 26 made of circular steel rail is fixed to the inside of the pedestal, and the sand pump 13 is pivoted and swung at an eccentric position of a ring 27 that slides on the rail. A roller chain 28 is fastened to the outer periphery of the flange formed above the sliding position to form a gear ring, and the gear ring by the roller chain includes a pinion gear 3 of a geared motor 29 that rotates in reverse every rotation.
0 is engaged. The meshing parts of the mutual gears are covered with an installation board 31 on which the geared motor is installed, a gear case 32, etc., and the inside thereof is an oil bath filled with oil, and a sealing member 33 is provided to prevent oil leakage. There is. Therefore, with the above configuration, the sand pump 13 rotates in reverse as the ring 27 rotates in reverse.

Further, the high pressure injection water swinging mechanism will be explained in detail with reference to FIGS. A pipe and a nozzle are installed on the legs so that high-pressure jet water is guided to the nozzle 17 and the high-pressure jet water excavates the bottom of the water directly below the suction port of the sand pump 13. The nozzle 17 swings at a swivel joint 18 in the middle of the pipe by sliding a guide wheel 17c formed at the tip of the nozzle on a jettorer 35, which is a guide frame installed below the legs 15. . As shown in FIG. 8, the nozzle automatically swinging mechanism has two swinging water injection ports 17b on the left and right in front of the water injection port 17a, and a closing valve that alternately operates on the swinging water injection ports. 36 is mounted on one shaft, and the nozzle 17 is rotated by sliding on the joint letter 35 with the swivel joint 18 as the rotation center due to the reaction of the water sprayed from the oscillating water spout 17b that is opened on one side. Stoppers 35 formed on both sides of the jettor 35 by rotation
Guide shaft 3 protruding from the oscillating water injection port of the closing valve is shown in a.
When the tip of the nozzle 6a hits, the opening by the closing valve 36 is changed and water is ejected from the other oscillating water injection port 17b, and the nozzle rotates due to the reaction and returns to the path it came from. Therefore, the swinging mechanism based on swinging of the nozzle is automated.

In the drawing, 37 is a control room which can also be switched to unmanned control, 38 is a floating sheave, 39 is a cable drum, and 40 is an engine generator.

Function Therefore, since the structure of the dredging device for a dam lake is as described above, the endless winch 23 on the barge 1
When operated, the weight of the rope 25 hanging in the water in the form of a parapet line acts on the tension roller 24, making it easier to bind the rope 25 to the winding drum without the need for an accompanying device. And since the power source is unified, the barge can be moved to the working position with simple operations.

Once the barge is moved to the working position, the synchronous differential winding drum winch 20 on the barge is driven. Three supporting cables 9 are equally distributed around the water guide tube 8 from a bracket 19 protruding from the weight body of the floating seat, and are hoisted and fed out by the large diameter barrels 20a of three synchronous differential winding barrel winches 20. The suspension rope 22 suspending the counterweight by the small-diameter trunk 20b that is synchronously and differentially moved is let out and hoisted up, thereby allowing the dredging mechanism to reach the bottom of the water. The weight of the counterweight 21 is adjusted by filling the dredging mechanism, which tends to be heavy, with the dredging mechanism equipped with the sand pump 13 and the high-pressure injection pump 16, and the water guide tube 8 to a certain level of its own weight with sand and water. By balancing these in the synchronous differential winding drum winch 20, the weight and size can be reduced, and it can be driven with low power, which is effective.

When the pedestal reaches the bottom of the water, at the same time, the three high-pressure injection pumps 16 installed above the pedestal are fed out from the cable drum 39 and the hoisted cable is powered by the power supply on the barge 1. The high-pressure jet water is jetted from the nozzle 17 through the pipe 34. The nozzle is equipped with a self-weight swinging mechanism that utilizes high-pressure jet water, and has a swivel joint 1.
8 as a fulcrum and slides the jettor 35 of the guide frame to reciprocate. Then, the bottom of the water near the sand pump 13 suction port is excavated, and earth and sand are stirred up. On the other hand, the sand pump 13 is driven by the power supply on the barge with the cable fed out and hoisted up by the cable drum, and at the same time, the geared motor 29 installed on the pedestal is also driven, and the sand pump is mounted at an eccentric position. 27 is rotated, and the sand pump swings as the ring rotates. A high-pressure injection pump then sucks up the mud and water. Therefore, it has been solved that the conventional sand pump, which did not swing, was buried in a mortar-shaped recess in the bottom of the water by the collapse of earth and sand around the recess. In addition, the meshing portion between the pinion gear 30 and the ring gear of the geared motor is immersed in a sealed oil bath for smooth operation, and a changeover switch is provided so that the ring 27 is reversed each time it rotates. Therefore, the cables from the barge will not get tangled.

Therefore, the earth and sand water sucked up by the sand pump is temporarily stored in a surge tank 2 on the barge, and is sent by an axial flow pump 3 through a sand water pipe 4 to a sand water separation and storage area on the ground. Since the surge tank 2 is provided, even if either the sand pump 13 or the axial flow pump 3 fails, negative pressure will not be generated in the water pipe 8, so that not only the pump itself but also the pump itself. Even the water tube was no longer damaged.

Effects As a result of the above, the present invention enables efficient dredging even in narrow dam lakes by suspending a water pipe made of strong and lightweight raw polyester cloth and sucking up sediment water with a sand pump at the bottom. Since the dredging mechanism is balanced with a counterweight that can be adjusted to raise and lower, the synchronous differential winding drum winch can be operated smoothly without requiring large driving force.
When the dredging mechanism reaches the bottom of the water, it can sit stably by using three legs, and the nozzle of the sand pump mid-high pressure injection pump swings, so it excavates the earth and sand evenly and blows it up. As a result, sand pumps are now able to pump water without burying it in soil. In addition, since a surge tank is installed on the barge above the water tube, even if the sand pump breaks down, the negative pressure of the axial flow pump will not damage the water tube or the axial flow pump itself, making operation safer. It is something that has a nature. In addition, since an endless winch was used to move the position of the dredging, the weight of the cable can be tightened to the winding barrel of the endless winch, so there is no need to install a mechanism for this tightening, and it is simple. This has the effect of reducing weight and making the floating body smaller. Furthermore, the simplification of the mechanism simplifies the operation,
It can also be controlled unmanned and can be operated even in bad weather.

[Brief explanation of drawings]

FIG. 1 is an explanatory front view of the dredging device of the present invention, and FIG. 2 is a plan view thereof. FIG. 3 is an explanatory diagram of the arrangement of the cables, FIG. 4 is a front explanatory diagram of the dredging mechanism, and FIG. 5 is an explanatory cross-sectional view of the sand pump swinging mechanism. Figure 6 is an explanatory diagram of the high-pressure injection pump and its nozzle swing mechanism, Figure 7 is its plan view, and Figure 8
The figure is a sectional view illustrating the swinging mechanism. 1... Barge, 1a... Floating body, 2... Surge tank, 3... Axial flow pump, 4... Sand feeding water pipe, 5...
Support float, 6... Sand water separation and sand storage area, 7...
Intermediate tube, 8... Water guide tube, 9... Support rope, 10...
Plumb body, 11...Swivel joint,
12...Continuation pipe, 13...Sand pump, 14...
... Bracket, 15 ... Leg body, 16 ... High pressure injection pump, 17 ... Nozzle, 17a ... Water injection port, 1
7b... Swing water outlet, 17c... Guide wheel, 18... Swivel joint, 19...
Bracket, 20...Synchronous differential winding trunk winch, 2
0a...Large diameter trunk, 20b...Small diameter barrel, 21...Counterweight, 22...Hanging rope, 23...Endless winch, 24...Tension roller, 2
5...Cable, 26...Rail, 27...Ring,
28... Roller chain, 29... Geared motor, 30... Pinion, 31... Geared motor installation board, 32... Gear case, 33... Seal member, 34... Pipe, 35... Jettor, 35a... Stopper , 36... Closing valve, 3
7...Guide shaft.

Claims (1)

[Scope of Claims] 1. A barge 1 comprising several floating bodies and a sand pump 13 that excavates with a high-pressure injection pump 16 and pumps up the excavated earth and sand, hanging from the barge 1. The dredging mechanism, the transport mechanism that guides the pumped earth and sand water to the telescopic water tube 8 suspended from the barge and sends the water to the sand and water separation/sand storage field 6 on land, and the dredging work position of the barge are moved. In the dredging device for a dam lake, the two right and left oscillating water ports 17b formed just before the water injection port 17a of the nozzle that injects high-pressure water from the high-pressure injection pump 16 are operated by a closing valve 36. It is opened with a mechanism that opens and closes it alternately, and the water sprayed by the opening causes the water to swing automatically, and the high-pressure water jetted from the water injection port 17a of the nozzle excavates the bottom of the water immediately below the suction port of the sand pump 13, and drains the sand and water. High-pressure injection pump nozzle automatic swing mechanism that makes it soar. 2. A dredging mechanism hanging from the barge 1 consisting of a barge 1 composed of several floating bodies, a sand pump 13 that excavates with a high-pressure injection pump 16 and pumps up the excavated earth, and The dredging system consists of a transport mechanism that guides the soil and sand water to a telescopic water tube 8 suspended from the barge and sends the water to the sand and water separation/sand storage field 6 on land, and a movement mechanism that moves the dredging work position of the barge. In the dredging device for a dam lake, the sand pump 13 is rotatably continued via the swivel joint 11 at the lower part of the weight body 10 connected to the water pipe 8 which is the attachment part of the top bracket 14 of the pedestal. , a ring 2 in which the sand pump is pivotally supported at an eccentric position sliding on a rail 26 inside the pedestal;
7 is rotated and reversed by a geared motor 29 to swing the sand pump. 3. A dredging mechanism hanging from the barge 1 consisting of a barge 1 composed of several floating bodies, a sand pump 13 that excavates with a high-pressure injection pump 16 and pumps up the excavated earth, and The dredging system consists of a transport mechanism that guides the soil and sand water to a telescopic water tube 8 suspended from the barge and sends the water to the sand and water separation/sand storage field 6 on land, and a movement mechanism that moves the dredging work position of the barge. In a dredging device for a dam lake, supporting cables 9 are connected to brackets 19 that protrude at equal intervals from a ground weight body 10 in order to allow the dredging mechanism to reach a desired depth.
A synchronous differential winding drum winch 20 is installed on the barge, which allows the suspension rope 22 from the counterweight 21 to be paid out or reeled into the small diameter shell 20b, and the sling 22 from the counterweight 21 to the large diameter shell 20a is installed on the barge. A conveyance mechanism in which the counterweight 21 is adjusted to its own weight, and the water pipe 8 hanging down from the barge is expanded and contracted by operating the synchronous differential winding drum winch. 4. A dredging mechanism hanging from the barge 1 consisting of a barge 1 composed of several floating bodies, a sand pump 13 that excavates with a high-pressure injection pump 16 and pumps up the excavated earth, and The dredging system consists of a transport mechanism that guides the soil and sand water to a telescopic water tube 8 suspended from the barge and sends the water to the sand and water separation/sand storage field 6 on land, and a movement mechanism that moves the dredging work position of the barge. In a dredging device for a dam lake, a surge tank 2 is installed on a barge, a water pipe 8 is connected to the bottom of the surge tank via an intermediate pipe 7, and a sand pump 13 is connected to the bottom of the surge tank. A conveyance mechanism formed with a suction port of an axial flow pump 3 connected to a sand water pipe 4 leading to a sand water separation/sand storage field 6. 5. A dredging mechanism hanging from the barge 1 consisting of a barge 1 composed of several floating bodies, a sand pump 13 that excavates with a high-pressure injection pump 16 and pumps up the excavated earth, and The dredging system consists of a transport mechanism that guides the soil and sand water to a telescopic water tube 8 suspended from the barge and sends the water to the sand/water separation/sand storage field 6 on land, and a moving mechanism that moves the dredging work position of the barge. In a dredging device for a dam lake, both ends are fixed to the land, a combination of a pair of endless winches 23 and a tension roller 24 of a barge is placed in the middle, and the rest is by a cable 25 suspended in the water. , a barge moving mechanism in which a combination of a pair of endless winches 23 and a tension roller 24 can be operated using a single power source.