JP2005030135A - Dredging device and dredging method by use of grab bucket - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To efficiently perform dredging work using a grab bucket and reduce water pollution. <P>SOLUTION: This dredging device is provided with the grab bucket 10 for dredging sediment on water bottom, and a sand pump 23 having a suction hole and a sediment pressure feeding pipe 22 whose one end is connected with the sand pump 23 and whose other end is provided above water are provided in the grab bucket 10. Since sediment in the grab bucket 10 is sucked by the sand pump 23 and is discharged above water by the sediment pressure feeding pipe 22, continuous digging becomes possible without lifting the grab bucket 10 above water. Since digging is performed by the grab bucket 10, even sediment having large N value and hard and tight soil quality can be digged for dredging. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a dredge apparatus and a dredge method for excavating a water bottom with a grab bucket.

  As a method of dredging sediments such as rivers, dams and seas, general dredging using pump ships, grab ships, bucket ships, dipper ships, etc. There is a method of performing general scissors after use and crushing (for example, see Non-Patent Document 1).

  In general river construction, pump boats are often used. The dredging by the pump ship sucks the sediment at the bottom of the water and discharges it to the stockyard or landfill through the drainage pipe. The pump itself is intended for relatively soft soil such as sludge and sandy soil, and N value When dredging 10 or more earth and sand, a cutter device is often used together. Pump dredging has advantages such as continuous dredging and high work efficiency.

The grab ship is a dredger that excavates the earth and sand with a grab bucket and can dredge at a deep water depth and can cope with soil quality from soft mud to hard ground. For example, as shown in FIG. 4, the earth and sand dredged by the grab ship 1 is separated into gravel, clay, sediment, miscellaneous garbage, etc. by the processing plant ship 2, and then transported to the shore by the earth ship 3 to be tracked from the shore. It is transported to the disposal site at 4 mag. The dredging method using the grab ship 1 can be used when the earth and sand are transported by the earth ship 3 and the distance for discharging the soil is very long and the pump ship cannot be applied.
Civil Engineering Handbook II, 4th edition, Gihodo Publishing, November 18, 1989, p. 1626-1627, 1822

  However, when dredging using a grab ship, the excavated earth and sand are lifted to the surface together with the grab bucket, and it takes time to move up and down the grab. If the work efficiency was low. Also, when lifting the grab bucket, earth and sand spilled from the grab mixed with the surrounding water, and measures had to be taken to prevent water pollution.

  In the method using a pump ship, continuous dredging can be performed, but it cannot be applied when the bottom of the water is hard. In addition, obstacles larger than the suction port such as dust on the bottom of the water or large stones cannot be removed, and there is a possibility that the suction port may be blocked by the obstacle.

  An object of the present invention is to more efficiently perform dredging work using a grab bucket and reduce water pollution.

  In order to solve the above-described problems, the invention described in claim 1 is a dredging device including a grab bucket 10 for dredging sediment at the bottom of the water. For example, as shown in FIG. 1, a suction port is provided in the grab bucket 10. And a sand pump 23 having one end connected to the sand pump 23 and the other end provided on the water.

  According to the first aspect of the present invention, since the earth and sand in the grab bucket 10 is sucked by the sand pump 23 and discharged onto the water by the earth and sand feeding pipe 22, excavation is continued without raising the grab bucket 10 to the water. can do. In addition, since the excavation is performed with the grab bucket 10, it is possible to excavate and dredge even hard soil with large N value.

  The invention according to claim 2 is characterized in that in the dredge apparatus according to claim 1, the grab bucket 10 includes a stirring water hose 21 having a spout and fed from above the water.

  According to the second aspect of the invention, since the earth and sand in the grab bucket 10 is agitated by the water ejected from the ejection port of the agitation water hose 21, a muddy water flow is formed in the grab bucket 10, and the sand pump 23 It is possible to prevent the suction port from being blocked, and to more efficiently discharge the soil in the grab bucket 10. Moreover, by discharging water into the grab bucket 10 in a state where the grab bucket 10 is closed and stirring the earth and sand, the mud water can be adjusted to an optimum concentration for discharging with the sand pump 23 and stable soil discharging can be performed.

  According to the third aspect of the present invention, in the dredging method of dredging the bottom sediment with the grab bucket 10, the sediment in the bottom 40 is excavated with the grab bucket 10, and then the water is put into the grab bucket 10 with the grab bucket 10 closed. , And the earth and sand are agitated, and the agitated earth and sand are repeatedly transported onto the water by the sand pump 23 inside the grab bucket 10.

  According to the invention described in claim 3, since water is jetted into the grab bucket 10 and the earth and sand are stirred, a muddy water flow is formed in the grab bucket 10 and the suction port of the sand pump 23 is blocked. Can be prevented and the soil in the grab bucket 10 can be discharged more efficiently. Moreover, by discharging water into the grab bucket 10 in a state where the grab bucket 10 is closed and stirring the earth and sand, the mud water can be adjusted to an optimum concentration for discharging with the sand pump 23 and stable soil discharging can be performed. In addition, since it is sucked by the sand pump 23 and discharged to the water by the sediment pressure feeding pipe 22, it is possible to continuously dig without raising the grab bucket 10 to the surface of the water. It can be shortened. In addition, since the excavation is performed with the grab bucket 10, it is possible to excavate and dredge even hard soil with large N value.

  According to a fourth aspect of the present invention, in the dredging method according to the third aspect, a pollution prevention curtain 30 is installed around the grab bucket 10.

  According to the fourth aspect of the present invention, since the bottom sediment is excavated by the grab bucket 10 with the anti-pollution curtain 30 installed in the surrounding area, it is generated when excavating the sediment at the bottom 40 by the grab bucket 10. Water pollution can be further reduced.

  According to the first aspect of the present invention, since the earth and sand in the grab bucket is sucked by the sand pump and discharged onto the water by the earth and sand pressure feeding pipe, the grab bucket can be continuously excavated without being raised to the water. . In addition, since the excavation is performed with a grab bucket, it is possible to excavate and dredge even hard soil with large N value.

  According to the second aspect of the invention, the same effect as that of the first aspect of the invention can be obtained, and the sand in the grab bucket is agitated by the water ejected from the ejection port of the agitation water hose. The soil in the grab bucket by the pump can be discharged more efficiently.

  According to the third aspect of the present invention, the grab is repeatedly ejected with water injected into the grab bucket while the grab bucket is closed, the earth and sand are stirred, and the stirred earth and sand are conveyed onto the water by a sand pump. Drilling continuously without raising the bucket to the surface. In addition, since the excavation is performed with a grab bucket, it is possible to excavate and dredge even hard soil with large N value. Further, since the earth and sand in the grab bucket is agitated, the sand in the grab bucket can be discharged more efficiently by the sand pump.

  According to the invention described in claim 4, the same effect as that of the invention described in claim 3 can be obtained, and the bottom sediment can be excavated with the grab bucket in the state where the anti-pollution curtain is installed around the grab bucket. It is possible to further reduce the water pollution generated when excavating the bottom sediment with a bucket.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  The dredge apparatus of the present invention comprises a work boat on the water and an underwater grab bucket 10.

  FIG. 1 and FIG. 2 are a front view and a side view, respectively, showing a form example of the grab bucket 10 in a closed state of the dredge device of the present invention.

  The grab bucket 10 includes a base 11 and a pair of buckets 12 and 12.

  The base 11 has a pair of parallel shafts 14 and 14 to which the buckets 12 and 12 are respectively attached, and a rotation (not shown) for simultaneously rotating the buckets 12 and 12 with respect to the shafts 14 and 14 in opposite directions. A mechanism is provided. A suspension member 15 is provided at the upper end of the base 11. The suspension member 15 suspends the grab bucket 10 from the crane provided on the work boat.

  In the figure, the buckets 12 and 12 are closed with their blade edges 13 and 13 fitted to each other, but open and close by simultaneously rotating in opposite directions with respect to the shafts 14 and 14.

  The buckets 12 and 12 are provided with a stirring water hose 21, earth and sand pressure feeding pipe 22, and a sand pump 23, respectively.

  The agitation water hose 21 extends to a work boat on the water, water is supplied from a water pump (not shown) provided on the work boat, and water is ejected from a spout provided at the tip. The spout is provided near the blade edge 13 of the bucket 12.

  One end of the earth and sand pressure feeding pipe 22 is attached to the sand pump 23, the other end extends to the work boat on the water, and further extends from the work boat to the receiving tank of the treatment plant.

  The sand pump 23 sucks earth and sand from the suction port provided in the bucket 12 and sends the earth and sand to the work boat on the water via the earth and sand pressure feeding pipe 22. A metal mesh is installed at the suction port, so that troubles caused by the sand pump 23 sucking obstacles can be avoided.

  The work ship is provided with a crane that moves the grab bucket 10 and a water supply pump that supplies water to the stirring water hose 21. In addition, a winding device for winding the stirring water hose 21 and the earth and sand pressure feeding pipe 22 and earth and sand processing equipment are provided.

  Next, the wrinkle method will be described. First, as shown in FIG. 3, the grab bucket 10 with the buckets 12, 12 opened is lowered to the bottom 40.

  Next, the buckets 12 and 12 are rotated, and the water bottom 40 is excavated with the blade edges 13 and 13. Further, the buckets 12 and 12 are rotated and closed until the blade edges 13 and 13 are fitted.

  Next, water is spouted from the agitation water hose 21, the earth and sand inside the closed bucket 12 are agitated, and the agitated earth and sand are sucked by the sand pump 23 and discharged to the work boat on the water via the earth and sand pressure feeding pipe 22. Soil.

  When the earth and sand discharged from the earth and sand pressure feeding pipe 22 is reduced, the water pump and the sand pump 23 are stopped, and the buckets 12 and 12 are opened again. Next, the grab bucket 10 is further lowered or moved in the horizontal direction to excavate the bottom 40, and the above operation is repeated.

  When an obstacle such as garbage or a large stone larger than the mesh of the wire mesh at the suction port is mixed in the bucket 12, the soil is first sucked and only the obstacle is left in the bucket 12. Next, the water pump and sand pump 23 are stopped, and the grab bucket 10 is lifted onto the water while the bucket 12 is closed, and the obstacle is removed. When the grab bucket 10 is lifted to the water, there is no earth and sand inside, so there is no risk of water pollution.

  As described above, according to the dredging method of the present invention, the excavated earth and sand can be discharged without lifting the grab bucket 10 to the surface of the water, so that the water pollution associated with the raising and lowering of the grab bucket 10 can be reduced. Further, since the grab bucket 10 can be continuously excavated without moving up and down, the work efficiency of the dredging does not decrease even at a large depth. In addition, since the excavation is performed with the grab bucket 10, it is possible to excavate and dredge even hard soil with large N value.

  When dredging, the pollution prevention curtain 30 is provided around the excavation site by the grab bucket 10 in consideration of soil quality and water flow. By providing the pollution prevention curtain 30, it is possible to further reduce the water quality pollution that occurs when the grab bucket 10 excavates the earth and sand of the bottom 40. In the dredging by the conventional grab bucket, it was necessary to provide a pollution prevention curtain up to the water surface in order to lift the earth and sand with the grab bucket. It is not necessary to provide the pollution prevention curtain 30 up to the surface of the water, and the height of the curtain should be sufficient to prevent water pollution during excavation. For this reason, the installation range (height) of the pollution prevention curtain 30 can be lowered to reduce the cost.

  Further, the shape of the grab bucket 10 is not limited to the present embodiment, and any shape can be used. Further, the arrangement of the agitation water hose 21 does not hinder excavation and can be arbitrarily arranged as long as the earth and sand in the grab bucket 10 can be agitated. Of course, the sand pump 23 and other specific detailed structures can be appropriately changed.

It is a front view which shows the example of the form of the grab bucket of the closed state of the dredge apparatus of this invention. It is a side view which shows the example of the form of the grab bucket of the closed state of the dredge apparatus of this invention. It is a schematic diagram which shows the dredging method of this invention. It is a schematic diagram which shows the conventional scissors method.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Grab ship 2 Processing plant ship 3 Earth ship 4 Truck 10 Grab bucket 11 Base 12 Bucket 13 Cutting edge 14 Shaft 15 Suspension member 21 Stirring water hose 22 Sediment pressure piping 23 Sand pump 30 Pollution prevention curtain 40 Bottom of the water

Claims (4)

  In a dredge apparatus comprising a grab bucket for dredging soil at the bottom of the water, the sand pump having a suction port in the grab bucket, and a sand pressure feeding pipe having one end connected to the sand pump and the other end provided on the water.浚 渫 device characterized by.   The dredge apparatus according to claim 1, further comprising a stirring water hose having a spout in the grab bucket and fed from above the water.   In the dredging method of dredging the bottom sediment with the grab bucket, the bottom sediment is excavated with the grab bucket, then the grab bucket is closed and water is blown into the grab bucket to stir the sediment, and the stirred sediment is grabbed. A dredging method characterized by repeating conveyance onto water with a sand pump inside the bucket.   The dredging method according to claim 3, wherein a pollution prevention curtain is installed around the grab bucket.

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