JP2011179190A - Method for discharging sediment in gate groove - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for discharging sediment in a gate groove, which enables the sediment accumulated in the gate groove of a waterway to be surely discharged without use of an expensive device. <P>SOLUTION: When a sediment-discharging gate 6 is opened, water W2 flowing through a waterway 5 for discharging the sediment is partially guided into the gate groove 10 via a water-conveyance passage 11 formed on at least either the upstream side or downstream side of the gate groove 10. Accordingly, the sediment G in the gate groove 10 is discharged by a flow of water W2a flowing into the gate groove 10. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a doorway sediment discharge method capable of easily discharging the sediment accumulated in a waterway doorway without using an expensive device.

  As an example of hydroelectric power generation, a power generation method is known in which a sedimentation basin is provided on the upstream side of a power plant, and water passing through the sand basin is supplied to the power plant. The sand basin is a facility for removing sand, mud and the like mixed in the water taken from the dam, and the sand and mud collected in the sand basin are discharged through a sand discharge gate.

  10 and 11 show a conventional sand removal gate 6. As shown in FIG. 11, the sand removal gate 6 is held in a door groove 10 formed in the side wall 5 a of the water channel 5 so as to be able to be raised and lowered, and is normally in a fully closed state. The door groove 10 is composed of door stop portions 10 a and 10 b and a groove bottom 10 c, and both end portions in the left and right direction of the sand removal gate 6 are movable in the vertical direction with respect to the door groove 10. The sand and mud collected at the bottom of the sand basin are discharged together with a part of the water W2 of the sand basin by opening the sand discharge gate 6. Therefore, after the sand removal operation is completed, the sand discharge gate 6 cannot be fully closed. Therefore, conventionally, an operator descends to the lower end portion of the door groove 10 to remove the deposit G accumulated at the lower end portion of the door groove 10.

  Conventionally, a sluice gate that automatically removes deposits accumulated in the doorway has been known (see, for example, Patent Document 1). This sluice door has a door housing groove formed below the bottom of the water channel, and a drive device for raising the door body is provided at the lower end of the door housing groove.

JP 9-228349 A

  However, it is dangerous for the operator to go down to the lower end of the door groove 10 to remove the deposit G, and it takes time to completely remove the deposit G accumulated at the lower end of the door groove 10. There is a problem that it takes. That is, even if the sand discharge operation of the sand basin by the sand discharge gate 6 is completed, it takes a lot of time and danger until the sand discharge gate 6 is fully closed, and improvement of the sand discharge operation is required. .

  Since the sluice door of patent document 1 accommodates a door body in a door body accommodation groove | channel, it is necessary to excavate the bottom face of a water channel by the height of a door body. Therefore, the construction cost becomes high, and it is difficult to apply it to a small-scale part because of its effect. Moreover, the sluice gate of patent document 1 increases the door weight by providing a door groove protection frame for protecting the door groove on the upper surface of the door body, and the existing door opening / closing device cannot be used in terms of opening / closing capability. There is a problem. The problem that sediment accumulates in the doorway is not limited to the sand discharge gate provided in the sand basin, but also exists in other facilities such as water intake facilities and corner dropping facilities.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a door groove deposit discharge method capable of reliably discharging the sediment accumulated in the door groove of a water channel without using an expensive device.

  In order to achieve the above object, the invention according to claim 1 is a door groove deposit discharge method for holding a gate for opening and closing a water channel so that the gate can be moved up and down, and when the gate is opened, A portion of the water flowing through the water channel through a water guide passage formed on at least one of the side and the downstream side is guided into the door groove, and the water flow into the door groove causes the water in the door groove to A deposit discharging method for a doorway, wherein the deposit is discharged.

  According to the present invention, when the gate is opened, a part of the water flowing through the water channel is guided into the door groove through the water guide passage, and the deposit in the door groove is swept away by the flow of water flowing into the door groove. It is.

  The invention according to claim 2 is the door groove deposit discharge method according to claim 1, wherein the channel cross-sectional area of the water inflow portion of the water conduit is larger than the channel cross-sectional area of the water outflow portion. It is characterized by being set.

  According to a third aspect of the present invention, in the method for discharging a deposit in the door groove according to the first or second aspect, the water channel is a sand discharge channel for flowing water from a settling basin, and the gate is connected to the sand discharge channel. It is a sand discharge gate provided.

  According to the first aspect of the present invention, the deposit in the door groove can be swept away using a part of the water flowing through the water channel, so that the deposit in the door groove can be obtained without using an expensive device. Goods can be discharged reliably. Therefore, it is not necessary to remove the deposits in the doorway by human power, and the efficiency of opening and closing the water channel by the gate can be improved. In addition, it is not necessary for the operator to descend to the lower end of the door groove for removing the deposits, and the safety of the water channel opening / closing operation can be improved.

  According to the second aspect of the present invention, the channel cross-sectional area of the water guide inflow portion of the water guide passage is set larger than the channel cross-sectional area of the water guide outflow portion. The speed of water can be increased, and the effect of flushing deposits in the doorway can be enhanced.

  According to the third aspect of the present invention, even if a large amount of sediment such as sand and mud flows from the sand basin to the sand discharge channel, the ditch holding the sand discharge gate using the water flowing through the sand discharge channel. Since the sediment in the inside can be reliably discharged, the sand removal gate can be fully closed immediately after the sand removal operation is completed, and maintenance work of hydroelectric power generation becomes easy.

It is a perspective view which shows the deposit discharge method of the door groove concerning embodiment of this invention. It is an expanded sectional view of the door groove of FIG. It is a cross-sectional view of the water channel in which the door groove of FIG. 1 is formed. It is a front view of the sand removal gate of FIG. It is sectional drawing which follows the AA line of FIG. It is a top view of the sand basin in which the sand removal gate of FIG. 3 is arrange | positioned. It is sectional drawing of the sand basin of FIG. It is a partial expanded sectional view which shows the detail of the sand removal gate and door groove of FIG. It is an expanded sectional view which shows the modification of the door groove and water guide passage of FIG. It is a perspective view of the conventional door groove. It is a cross-sectional view of the water channel in which the door groove of FIG. 10 is formed.

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

  1 to 9 show an embodiment of the present invention. 6 and 7 show a sand basin 1 used for hydropower generation, and the sand basin 1 is located between a dam and a power plant. The settling basin 1 precipitates sand and mud mixed in the water W1 supplied from the dam located on the upstream side, and supplies the water from which the sand and mud have been removed to the power plant located on the downstream side. It has a function. The sand basin 1 has side wall portions 2a and 2b and a bottom wall portion 2c, and sedimented sand, mud and the like are accumulated in the bottom wall portion 2c. A power generation water channel 4 for supplying water to the power plant is located downstream of the sand basin 1. A wire net 3 is provided at the upstream end of the power generation water channel 4 to capture foreign matter floating in the water W stored in the sand basin 1.

  At the downstream end of the bottom wall portion 2c of the sand basin 1, a reservoir portion 2d in which precipitated sand, mud and the like are accumulated is formed. The downstream end surface 2e of the reservoir portion 2d extends upward, and the end thereof is connected to the power generation water channel 4. The reservoir portion 2 d of the sand basin 1 is connected to the sand discharge water channel 5. A sand discharge gate 6 is provided at the upstream end of the water discharge channel 5. The sand discharge gate 6 has a function of flowing a part of the water W2 stored in the sand basin 1 to the river 8 side for sand discharge. The sand removal gate 6 can be moved up and down by an opening / closing device (lifting device) 7 provided on the upper side of the water discharge channel 5.

  1 to 5 show a door groove 10 formed in the sand discharge channel 5. The door groove 10 is formed at the upstream end of the sand discharge channel 5, and the sand discharge gate 6 is held in the door groove 10 so as to be movable up and down as shown in FIGS. 3 to 5. The door grooves 10 are respectively formed on the left and right side walls 5a of the sand discharge channel 5, and the door grooves 10 face each other. The door groove 10 extends in the vertical direction along the side wall 5 a, and the lower end is connected to the bottom surface 5 c of the sand discharge channel 5. The door groove 10 has a U-shaped cross section, and includes a guide surface 10a, an upstream holding surface 10b, and a downstream holding surface 10c.

  The upstream holding surface 10b and the downstream holding surface 10c are arranged to face each other. The upstream holding surface 10b and the downstream holding surface 10c extend in a direction perpendicular to the side wall 5a, and have a function of holding the sand removal gate 6 with respect to the flow direction of the water W2. The guide surface 10a connects the back end of the upstream holding surface 10b and the back end of the downstream holding surface 10c. The guide surface 10a has a function of holding the sand removal gate 6 in a direction orthogonal to the flow direction of the water W2. The upstream holding surface 10 b can contact the left and right end portions of the front surface 6 e of the sand discharge gate 6. The downstream holding surface 10 c can contact the left and right end portions of the back surface 6 f of the sand removal gate 6.

  On the bottom side of the sand discharge channel 5, there is formed a water guide passage 11 that guides a part of the water W <b> 2 flowing through the sand discharge channel 5 into the door groove 10 when the sand discharge gate 6 is opened. The water guide passage 11 is formed on the upstream side of the door groove 10. The water introduction inflow portion E1 of the water guide passage 11 is open to the upstream end side of the sand discharge water channel 5. The water guide outflow portion E <b> 2 of the water guide passage 11 is open to the upstream holding surface 10 b side of the door groove 10. The upper wall 11a of the water guide inflow portion E1 is formed in a curved surface that extends obliquely upward as it goes upstream. The upper wall 11b of the water guide / outflow portion E2 is formed in a plane parallel to the bottom surface 5c of the water discharge channel 5.

  The height from the bottom surface 5c of the water discharge channel 5 to the upstream end of the upper wall 11a of the water inflow portion E1 is set to H1 (H1 = 300 mm), for example. Further, the height from the bottom surface 5c of the water discharge channel 5 to the upstream end of the upper wall 11b of the water introduction / outflow portion E2 is set to H2 (H2 = 100 mm), for example. Thereby, the flow-path cross-sectional area of the water conveyance inflow part E1 of the water conveyance path 11 is set larger than the flow-path cross-sectional area of the water conveyance outflow part E2.

  As shown in FIGS. 4 and 5, the sand removal gate 6 is held in the left and right door grooves 10 so as to be movable up and down. The sand removal gate 6 is composed of a rectangular plate member. In this embodiment, the sand removal gate 6 is composed of a metal member whose surface is rust-proofed or a metal member having corrosion resistance. The sand discharge gate 6 has a lower end portion 6 a that can contact the bottom surface 5 c of the sand discharge channel 5. An upper end portion 6b of the sand removal gate 6 is connected to a lifting rod 7a of the opening / closing device 7 through a reinforcing plate 6g. The left side portion 6 c of the sand removal gate 6 is held in one door groove 10. The right side portion 6 d of the sand removal gate 6 is held in the other door groove 10.

  FIG. 8 shows the details of the sand removal gate 6 and the door groove 10 in FIG. A guide frame 12 for increasing the dimensional accuracy of the door groove 10 is provided on the inner surface side of the door groove 10. The guide frame 12 is made of a metal member, and has a U-shaped cross section. The sand discharge gate 6 has a watertight packing 13 made of rubber at the left and right end portions on the back surface 6f side. The watertight packing 13 can come into contact with the downstream guide surface 12 b of the guide frame 12. The left and right end 6c of the sand removal gate 6 can be in contact with the inner side guide surface 12a of the guide frame 12.

  The sand discharge gate 6 can be raised and lowered by an opening / closing device 7, and the sand discharge water channel 5 is opened and closed by the raising and lowering operation of the sand discharge gate 6. When the lower end portion 6a of the sand removal gate 6 moves away from the bottom surface 5c of the sand discharge water channel 5 due to the rise of the sand removal gate 6, sand and mud accumulated in the reservoir portion 2d of the sand settling basin 1 are sanded. Along with a part of the water W 2 stored in the pond 1, the water is discharged to the sand discharge channel 5 side.

  The water guide passage 11 for guiding a part of the water W2 flowing through the sand discharge water channel 5 into the door groove 10 may be formed when a new sand discharge water channel 5 is laid, or the existing sand discharge water channel 5 is modified. May be formed. When the water guide passage 11 is formed in the existing sand discharge channel 5, a part of the side wall 5a of the sand discharge channel 5 made of concrete is excavated, and a part of the side wall 5a on the upstream side of the door groove 10 is shown in FIG. Cut into shape. Thus, formation of the water guide passage 11 to the existing sand discharge water channel 5 can be performed only by excavating a part of the side wall 5a of the sand discharge water channel 5 made of concrete.

  Next, the procedure and operation of the deposit discharging method of the door groove 10 will be described.

  When the sand discharge gate 6 is in a fully closed state, the water W1 taken from the dam is removed from the sand basin 1 by removing sand and mud and supplied to the power plant via the power generation channel 4. When a certain amount of sand, mud, or the like has accumulated on the bottom wall 2c of the sand basin 1, the sand discharge gate 6 is opened by the opening / closing device 7, and a part of the water W2 stored in the sand basin 1 is removed. It is necessary to flow to the river 8 side for sand removal.

  1 to 3 show a state in which the sand removal gate 6 is opened for sand removal. In a state where the sand discharge gate 6 is opened, a part of the water W 2 stored in the sand basin 1 flows to the river 8 side through the sand discharge channel 5. Here, since the water guide passage 11 is formed at the lower end portion of the door groove 10 that holds the sand discharge gate 6, a part of the water W <b> 2 a that flows through the water discharge channel 5 is contained in the door groove 10. Led. As shown in FIG. 2, the flow passage cross-sectional area of the water flow inflow portion E1 of the water flow passage 11 is set larger than the flow channel cross-sectional area of the water flow outflow portion E2, so that the water flow outflow portion is larger than the water flow inflow portion E1. The speed of the water W2a of E2 can be increased, and the effect of sweeping away the deposit G made of sand or mud can be enhanced.

  When sand or mud accumulated in the sand basin 1 is discharged by the opening operation of the sand discharge gate 6, the sand discharge gate 6 is closed again. Here, since the deposit G does not remain in the lower end portion of the door groove 10, the sand discharge gate 6 is in a completely closed state, and the lower end portion 6 a of the sand discharge gate 6 is connected to the bottom surface 5 c of the sand discharge channel 5. In close contact. Accordingly, the flow of water W from the sand basin 1 to the sand discharge channel 5 is blocked, and the water W in the sand basin 1 is supplied only to the power plant side via the power generation channel 4.

  In this way, the deposit G in the door groove 10 can be swept away by using a part of the water W2a out of the water W2 flowing through the sand discharge channel 5, so that the door groove can be used without using an expensive device. The deposit G in 10 can be reliably discharged. Accordingly, it is unnecessary to remove the deposit G in the door groove 10 by human power, and the efficiency of opening and closing the sand discharge water channel 5 by the sand discharge gate 6 can be increased. Moreover, it is not necessary for the operator to get down to the lower end of the door groove 10 for removing the deposit G, and the safety of the opening / closing operation of the drainage water channel 5 can be enhanced.

  Furthermore, when the water guide passage 11 is formed in the existing sand discharge water channel 5, it is only necessary to excavate the side wall 5a of the sand discharge water channel 5 made of concrete, so that the cost of repair work can be reduced and the construction period can be shortened. Therefore, as in Patent Document 1 which is a prior art, compared to a case where a door body storage groove is formed below the bottom surface of the water channel, and a driving device for raising the door body is provided at the lower end portion of the door body storage groove. Thus, the repair cost can be significantly reduced.

  Moreover, since the sand removal gate 6 has the watertight packing 13 which can contact with the guide frame 12 of the door groove 10, the watertight packing 13 of the door groove 10 by the water pressure which acts on the front surface 6e side of the sand discharge gate 6. The guide frame 12 is in close contact. Therefore, the water tightness of the sand discharge gate 6 with respect to the door groove 10 can be enhanced, and when the sand discharge gate 6 is completely closed, the flow of the water W2 from the sand settling basin 1 to the sand discharge channel 5 is surely prevented. be able to.

  The embodiment of the present invention has been described in detail above, but the specific configuration is not limited to the above-described embodiment, and even if there is a design change or the like without departing from the gist of the present invention, It is included in this invention. For example, in the above-described embodiment, the water guide passage 11 is formed on the upstream side of the door groove 10. However, as shown in FIG. 9, the water guide passage 11 is formed on the downstream side of the door groove 10. Also good. In this case, since the deposit G in the door groove 10 is discharged to the downstream end 11c side of the water guide passage 11 by the flow of the water W2a, the sand discharge gate 6 can be completely closed.

  Furthermore, in said embodiment, although the case where it applied to the door groove 10 of the sand discharge gate 6 was demonstrated, this invention is not limited to the sand discharge gate 6 of the sand discharge sand basin 1, and a door groove. As long as the gate can be moved up and down, it can be applied to other uses. For example, it can be applied to a hydropower intake facility, a corner dropping facility, or the like.

1 sand settling basin 2c bottom wall 4 power generation channel 5 sand discharge channel (water channel)
6 Sand Removal Gate (Gate)
7 Opening / Closing Device 8 River 10 Door Groove 11 Conveyance Path E1 Conveyance Inflow Portion E2 Conveyance Outflow Portion W2 Water W2a Water G Deposit

Claims (3)

  A doorway sediment discharge method for holding a gate for opening and closing a water channel so that the gate can be moved up and down, and when the gate is opened, via a water guide passage formed on at least one of an upstream side and a downstream side of the door groove. A portion of the water flowing through the water channel is guided into the door groove, and the deposit in the door groove is discharged by the flow of water flowing into the door groove. Method.   2. The doorway sediment discharge method according to claim 1, wherein a flow passage cross-sectional area of the water flow inlet portion of the water flow passage is set to be larger than a flow passage cross sectional area of the water flow outlet portion. The drainage of the doorway according to claim 1 or 2, wherein the water channel is a sand discharge channel for flowing water of a sand basin, and the gate is a sand discharge gate provided in the sand discharge channel. Method.

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