JP2008196222A - Dredged sediment transporting apparatus, dredged sediment transporting method, and dam deposited sediment disposal method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To propose a dredged sediment transporting method for transporting dredged sediment by using simple facilities without requiring lifting operation. <P>SOLUTION: Sediment scooped from the bottom of a dam at a dam sediment dredged location 4 is charged into a hopper 21 of a pontoon 22 hung from a main cable 13 awaiting in a floating state on a dam lake surface. Then the pontoon 22 is towed from the sediment dredged location 4 to a sediment dumping location 5 by a transversely traveling cable 30. After the sediment in the hopper 21 is dumped at the sediment dumping location 5, the pontoon 22 on which the vacant hopper 21 is loaded is returned to the sediment dredged location 4 again by the transversely traveling cable 30. These procedures are repeatedly carried out and the sediment deposited at an intake port is disposed of. The hopper 21 is only towed on the dam lake surface by the pontoon 22, and therefore the lifting work of the hopper 21 filled with a load is dispensed with, thus enabling the transportation of the dredged sediment by using extremely simpler facilities compared with a cable crane etc. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  TECHNICAL FIELD The present invention relates to a dredged material transporter suitable for use in a sediment dredging operation for removing sediment accumulated at a water intake for power generation at the bottom of a dam.

  On the dam dam, there is a water intake for taking water for power generation into the hydroelectric power generation facility, and a net is installed on the lake surface of the water intake to prevent driftwood, garbage, etc. from entering the water intake. An earth and sand stopper is installed at the bottom of the dam. Foreign matter such as earth and sand carried by the water flowing into the intake port accumulates at the bottom of the dam in front of the sediment prevention. Accordingly, it is necessary to periodically perform sedimentation dredging and disposal work for removing sedimentation sediment at the bottom of the dam in front of the water intake.

  In dredging and disposal work, the excavated sediment is excavated on the surface of the dam using a hydraulic excavator, etc., and the scooped sediment is transported from the location to a downstream sediment disposal site for disposal. In order to transport earth and sand from the dredging position to the disposal position, it is generally considered that a cable crane is used.

  The cable crane moves the hopper suspended on the main rope up and down by the hoisting rope and reciprocates along the main rope by the traversing rope. And dispose of the earth and sand from the hopper at the earth and sand disposal position. Instead of a cable crane, it may be possible to use a transport ship or a boat to load the earth and sand at the earth and sand basin, move to the earth and sand disposal position, and discard the earth and sand.

  However, when a cable crane for lifting a load using power and transporting it in the horizontal direction is used, the apparatus becomes large. In addition, a notification of installation conforming to laws and regulations is also required, and there is a restriction that its operation is limited to qualified crane operators. On the other hand, it is not desirable to transport earth and sand using a powered carrier ship or boat from the viewpoint of water pollution of the dam.

  In view of these points, the present invention proposes a dredged sand transport device and a dredged sand transport method capable of transporting dredged sand using simple equipment that does not require a lifting operation of the load. There is to do.

In order to solve the above-mentioned problems, the dredged sand transport device of the present invention is
In order to transport the sediment deposited on the bottom of the dam by a hydraulic excavator, etc. at the sediment sediment site to the sediment disposal site downstream of the sediment site,
A main rope spanned between the concrete anchor on the upstream side and the dam body on the downstream side along the route passing through the earth and sand disposal site and the sediment disposal site;
A pontoon suspended on this main rope and equipped with a hopper for loading earth and sand,
A tensioning device for adjusting the amount of slack of the main rope so that the state where the pontoon is floating on the surface of the dam lake is maintained at least from the place of earth and sand to the place of earth and sand disposal;
A traversing cable that runs between an upstream concrete anchor and a downstream dam body so as to draw an endless track along a path that passes through the sediment and sediment disposal site and is connected to the pontoon. When,
It has a winch for moving the traversing line along an endless track.

  By using the dredged material transporting apparatus having this configuration, the dredged material can be transported as follows. In other words, earth and sand loading work was carried out in which the earth and sand scooped up from the bottom of the dam at the place of the dam was put into a pontoon hopper waiting on the surface of the dam and floated on the surface of the dam lake. Tow down the pontoon from the earth and sand dredging site to the earth and sand disposal site by traversing to the downstream side, earth and sand disposal work to discard the earth and sand loaded on the hopper at the earth and sand disposal site, and a pontoon carrying an empty hopper May be repeated from the earth and sand disposal site to the earth and sand dredging site and towed to the upstream side towed by traversing.

  In the present invention, the hopper loaded with earth and sand is only towed on the surface of the dam lake by the pontoon, and the lifting work of the loaded hopper is unnecessary. For this reason, unlike a cable crane, a hoisting rope for lifting a load and its hoisting mechanism are unnecessary, and an extremely simple mechanism can be achieved. Moreover, since it is not necessary to lift a load, there is an advantage that the regulations imposed on the cable crane are not applied. Furthermore, the main rope tensioning device is for removing the slack of the main rope caused by fluctuations in the water level, and does not lift the load, so it can be of a simple configuration, such as a hoisting machine or jack. The imposed regulations do not apply.

  Also, in the event of a flood (during dam discharge), etc., the pontoon is moved upstream from the earth and sand basin, and the pontoon is retreated to a retreat position suspended above the dam lake surface. Once the water has settled and the water level has been resumed, the pontoon can be moved downstream again and floated on the lake surface.

Next, the disposal method of dam sedimentary earth according to the present invention is as follows:
The excavation work machine such as a hydraulic excavator excavates the sediment accumulated at the bottom of the dam and scoops it up on the surface of the dam and transports the scooped sediment to a sediment disposal site downstream of the sediment disposal site. In order to dispose of earth and sand at the earth and sand disposal site,
A pontoon is hung on the main rope spanned between the concrete anchor on the upstream side and the dam body on the downstream side, along the path through the dam site and the sediment disposal site on the downstream side,
Adjust the amount of slack of the main rope so that the pontoon is kept floating on the surface of the dam lake, at least from the landslide site to the sediment disposal site,
In order to tow the pontoon floating on the surface of the dam, the traversing bridge between the concrete anchor on the upstream side and the dam body on the downstream side along the route passing through the earth and sand disposal site and the sediment disposal site, Connected to the pontoon,
Sediment dredging work that excavates the sediment deposited at the bottom of the dam with a work machine for excavation such as a hydraulic excavator and scoops it on the surface of the dam lake,
Sediment loading work to put the scooped soil into a hopper placed on a pontoon that is standing on the surface of the dam lake at the sediment site,
Towing to the downstream side towing the pontoon loaded with earth and sand from the earth and sand dredging site to the earth and sand disposal site,
Sediment disposal work to discard the sediment loaded on the hopper at the sediment disposal site,
It is characterized by repeated towing work upstream of towing a pontoon carrying an empty hopper from a sediment disposal site to a sediment disposal site.

  In the present invention, the hopper loaded with earth and sand is only towed on the surface of the dam by the pontoon, and the lifting work of the loaded hopper is not required. For this reason, unlike a cable crane, a hoisting rope for lifting a load and its hoisting mechanism are unnecessary, and an extremely simple mechanism can be achieved. Moreover, since it is not necessary to lift a load, there is an advantage that the regulations imposed on the cable crane are not applied. Furthermore, the main rope tensioning device is for removing the slack of the main rope caused by fluctuations in the water level, and does not lift the load, so it can be of a simple configuration, such as a hoisting machine or jack. The imposed regulations do not apply.

  In addition to this, in the event of a flood (during dam discharge), the pontoon is moved upstream from the place of sediment to prevent it from being washed away, and the pontoon is retreated to a retreat position suspended above the dam lake surface. Once the flood has subsided and the water level has been resumed, the pontoon can be moved downstream and floated on the lake. Therefore, it is possible to easily cope with floods.

  Below, with reference to the drawings, a sediment treatment facility for dredging, transporting and discarding sediment deposited on the dam bottom using the dredged soil transport device to which the present invention is applied will be described.

  FIG. 1 is a schematic plan view and a schematic side view showing a main part of a sediment processing facility. FIG. 2 is an explanatory diagram showing the location of the dam. 3 (a) to 3 (c) are a plan view, a side view, and an explanatory view showing a traversing indexing state of the dredged sand transporting device, respectively.

  In this example, the sediment disposal facility 1 drains sediment S deposited on the bottom of the dam in front of the water intake 3 of the dam 2, and deposits the sediment from the sediment trap position 4 to the downstream sediment disposal position. A hydraulic excavator 6 for excavating and scooping up sediment on the surface of the dam and dumping it up on the surface of the dam to be transported to 5 and discarded there, and a site for disposal of sediment 5 And a dredged sand transport device 7 for transporting to and disposing of it.

  As shown in FIG. 2, an earth and sand stopper 8 is installed at the bottom of the dam at the earth and sand basin position 4, and a water intake 3 is formed on the rear side of the earth and sand stopper 8. The earth and sand S accumulated before the earth and sand stopper 8 is excavated by the excavator 6 and scooped up on the surface of the dam lake.

  As shown in FIG. 3, the dredged sand transporting device 7 is bridged between the upstream concrete anchor 11 and the downstream dam dam body 12 along the path passing through the sediment dredging site 4 and the sediment disposal site 5. A pair of main ropes 13 are provided. One end of each main rope 13 is fixed to a mounting frame 14 made of H-shaped steel or the like fixed to the slope of the dam dam body 12 on the downstream side via a wire socket 15.

  The other ends of the left and right main ropes 13 are wound around left and right pulleys 17 attached to the upper end of a supporting frame 16 assembled from H-shaped steel or the like installed on the upstream concrete anchor 11. Ends drawn downward from the left and right pulleys 17 are connected and fixed to left and right electric screw jacks 18 attached to the support frame 16. Each electric screw jack 18 functions as a tensioning device for adjusting the amount of slack of the main rope 13 according to the water level of the dam lake surface.

  A pontoon 22 on which a hopper 21 for loading earth and sand is mounted is suspended from the main rope 13. The pontoon 22 has a flat bottom rectangular shape. Four vertical struts 23 are fixed to the center of the upper surface of the pontoon 22, and a hopper 21 is attached to the pontoon 22 in an upward state. Further, a suspension pulley 24 is attached to the upper end portion of each vertical column 23, and these pulleys 24 are suspended from the main rope 13.

  In this example, at least from the earth and sand dredging place 4 to the earth and sand disposal place 5, the main screw 13 is adjusted by the electric screw jack 16 according to the water level so that the pontoon 22 is kept floating on the dam lake surface. The amount of slack is adjusted.

  Next, both ends of the traversing cable 30 are connected and fixed to the opening edges 21 a and 21 b on both sides of the hopper 21 mounted on the pontoon 22. The traversing line 30 is routed along the main line 13, and is infinite along the path passing through the landslide site 4 and the sediment disposal site 5 between the concrete anchor 11 on the upstream side and the dam body 12 on the downstream side. It is stretched over to draw an orbit.

  That is, as can be seen from FIG. 3C, the traversing line 30 extends from one end 30a connected and fixed to one opening edge 21a of the hopper 21 to the pulley 32 installed on the concrete anchor 11 on the upstream side in the horizontal direction. It extends. Further, the pulley 32 is directed downward via the winding position, passed through the suspension position of the pulley 34 to which the counterweight 33 is attached, and then directed upward, via the pulleys 35, 36, and 37. It extends to the position where the electric endless winch 38 is wound. Furthermore, from here, it is pulled out through the pulleys 39 and 40 in the horizontal direction, and extends to the position where the pulley 41 installed on the dam dam body 12 on the downstream side is wound. Then, it is drawn downward from the winding position via the pulley 42, passes through the suspension position of the pulley 44 to which the counterweight 43 is attached, and then goes upward, via the winding position of the pulley 45. The other end 30 b is connected and fixed to the opening edge 21 b of the hopper 21 by being pulled out in the horizontal direction.

(Disposal work of sediment)
Next, the sedimentation, transport and disposal work of the sediment in the sediment disposal facility 1 having the above configuration will be described. First, the pontoon 22 on which the empty hopper 21 is mounted is put on standby in a state where it is floated on the surface of the dam lake in the earth and sand basin 4.

  In this state, as shown in FIG. 2, the sediment S accumulated on the bottom of the dam is excavated by the excavator 6 at the sediment sediment location 4 and scooped up on the surface of the dam lake (sediment sedimentation operation). Next, the scooped up earth and sand are thrown into the hopper 21 of the pontoon 22 floating on the surface of the lake at the earth and sand basin 4 (sediment loading work). Thereafter, the electric endless winch 38 of the dredged material transporter 7 is driven to move the traversing line 30 along the endless track in the direction in which the pontoon 22 is towed downstream. When the pontoon 22 is towed to the sediment disposal site 5 on the downstream side, the electric endless winch 38 is stopped, and the pontoon 22 is stopped to the sediment disposal site 5 (towing work downstream).

  Next, the bottom of the hopper 21 is opened to the left and right, and the earth and sand loaded here is discarded in the earth and sand disposal site 5 (earth and sand disposal work). Thereafter, the electric endless winch 38 is driven in the reverse direction, and the pontoon 22 with the hopper 21 that has been emptied is towed by the traversing rope 30 to the upstream earth and sand basin site 4 and waits there (upstream). Towing to the side).

  The sediment deposited on the bottom of the dam is disposed of by repeatedly performing the above-described sediment dredging operation, sediment loading operation, downstream towing operation, sediment disposal operation and upstream towing operation.

  Here, when the lake surface water level fluctuates, the pontoon 22 cannot be suspended from the main rope 13 in an appropriate state. For example, when the water level drops, the pontoon 22 is suspended and an excessive load acts on the main rope 13. When the water level rises, the pulley is easily detached from the main rope 13. Therefore, in this example, the amount of slack of the main rope 13 is adjusted by an electric screw jack, and as shown in FIG. 1B, the pontoon 22 has a height of 22L and a high water level (HWL) at the low water level (LWL). ), The slack amount is adjusted so that the pontoon 22 has a height of 22H, and the suspended state of the pontoon 22 is always kept in an appropriate state.

  While the work is not being performed, the pontoon 22 is usually left floating on the surface of the dam lake, such as the earth and sand basin 4, but the pontoon 22 flows during a flood (when the dam is discharged). In order to prevent this from happening, the pontoon 22 is moved to the upstream end side and retreated to a retreat position in a suspended state on the surface of the dam lake. That is, as shown in FIG. 1 (b), during a flood (FWL), it is moved from the earth and sand pit position 4 to a position near the concrete anchor 11 on the upstream side and retreated to a retreat position 22F that is suspended. After the water level falls, the pontoon 22 is returned to the downstream side again to return to the state where it floated on the surface of the dam lake at the earth and sand basin 4.

  As described above, in the sediment disposal facility 1 of the present example, the dredged sand is transferred from the dredged soil position 4 to the sediment disposal position 5 by using the dredged sand transporting device 7 having a simple mechanism as compared with the case of using a cable crane or the like. Can be transported to and discarded there. In addition, even during a flood, it can be handled by a simple operation of moving the pontoon 22 floating on the lake surface to the upstream end.

(a) And (b) is the schematic plan view and schematic side view which show the principal part of the sediment disposal facility to which this invention is applied. It is explanatory drawing which shows the earth and sand basin place and hydraulic excavator of a dam. (a)-(c) is explanatory drawing which shows the plan view, side view, and traverse indexing state which respectively show a dredged material carrier.

Explanation of symbols

1 Sediment disposal facility 2 Dam 3 Water intake 4 Sediment dredging site 5 Sediment disposal site 6 Hydraulic excavator 7 Dredged material transport device 8 Sediment stopper 11 Upstream concrete anchor 12 Downstream dam dam 13 Main rope 14 Mounting frame 15 Wire socket 16 Supporting frame 17 Pulley 18 Electric screw jack 21 Hopper 21a, 21b Opening edge 22 Pontoon 23 Vertical support 24 Pulley 30 Traverse line 38 Electric endless winch S Accumulated earth and sand

Claims (5)

A dredged sand transport device that transports the sediment deposited on the surface of the dam by a hydraulic excavator or the like at the sediment trap site to the sediment disposal site downstream of the sediment trap site,
A main rope bridged between the concrete anchor on the upstream side and the dam body on the downstream side, along the path through the sediment and sand disposal site,
A pontoon suspended on this main rope and equipped with a hopper for loading earth and sand,
A tensioning device for adjusting the amount of slackness of the main rope so that the state where the pontoon is floating on the surface of the dam lake is maintained at least between the earth and sand disposal place and the earth and sand disposal place;
A traversing bridge that is connected between the upstream concrete anchor and the downstream dam body so as to draw an endless track along the path passing through the earth and sand disposal site and the earth and sand disposal site, and to which the pontoon is connected When,
A dredged material transporter comprising a winch for moving a traversing cable along an endless track. A method for transporting dredged soil using the dredged material transporting device according to claim 1,
Sediment loading work, in which the earth and sand scooped up from the bottom of the dam at the earth and sand basin place is put into a pontoon hopper waiting in a floating state on the surface of the dam lake,
Towing down the pontoon loaded with earth and sand from the earth and sand dredging site to the earth and sand disposal site by traversing to the downstream side,
Sediment disposal work to discard the sediment loaded on the hopper at the sediment disposal site,
A method for transporting dredged sand that repeats the towing work towed upstream by traversing a pontoon carrying an empty hopper from a sediment disposal site to a sediment dredging site. When the dam lake surface exceeds a predetermined water level, the pontoon is moved upstream from the landslide site, and the pontoon is retreated to a retreat position suspended above the dam lake surface,
The method for transporting dredged sand according to claim 2, wherein after the water level returns to a predetermined water level, the pontoon is again moved downstream and floated on the surface of the dam lake. The excavation work machine such as a hydraulic excavator excavates the sediment accumulated at the bottom of the dam and scoops it up on the surface of the dam and transports the scooped sediment to a sediment disposal site downstream of the sediment disposal site. , A method for disposing of dam sedimentary earth and sand to discard earth and sand at the earth and sand disposal site,
A pontoon is hung on the main rope spanned between the concrete anchor on the upstream side and the dam body on the downstream side, along the path through the dam site and the sediment disposal site on the downstream side,
Adjust the amount of slack of the main rope so that the pontoon is kept floating on the surface of the dam lake, at least from the landslide site to the sediment disposal site,
In order to tow the pontoon floating on the surface of the dam, the traversing cable between the concrete anchor on the upstream side and the dam body on the downstream side along the route passing through the earth and sand dredging site and the earth and sand disposal site, Connected to
Sediment dredging work that excavates the sediment deposited at the bottom of the dam with a work machine for excavation such as a hydraulic excavator and scoops it on the surface of the dam lake,
Sediment loading work to put the scooped soil into a hopper placed on a pontoon that is standing on the surface of the dam lake at the sediment site,
Towing to the downstream side towing the pontoon loaded with earth and sand from the earth and sand dredging site to the earth and sand disposal site,
Sediment disposal work to discard the sediment loaded on the hopper at the sediment disposal site,
A method for disposing of dam sedimentary soil, characterized by repeatedly performing towing work towing a pontoon carrying an empty hopper from a sediment disposal site to a sediment disposal site. When the dam lake surface exceeds a predetermined water level, the pontoon is moved upstream from the landslide site, and the pontoon is retreated to a retreat position suspended above the dam lake surface,
5. The disposal method of dam sedimentary earth according to claim 4, wherein after the water level returns to a predetermined water level, the pontoon is moved again downstream and floated on the surface of the dam lake.

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