JP4573618B2 - River intake structure - Google Patents

Description

  The present invention relates to a river intake structure for taking water for irrigation and the like from a river.

  A river intake structure that draws water for irrigation, etc. from a river, excavates a recess connected to the quay at the bottom of the river, and the intake is such that the lower end is located below the upper end of the recess in the quay connected to the recess. Some have a mouth so that sufficient water can be taken even if the river level drops.

  In this type of river intake structure, the water depth becomes deeper and the flow velocity becomes slower in the portion with the recess, so that the sand contained in the flowing water settles and accumulates in the recess. If sand accumulates in the recesses in this way, a large amount of sand may enter the intake port, and the intake port may be blocked. Conventionally, the upstream side of the intake port is dammed and manually or by a power shovel. The sand accumulated in the recess is discharged.

  In addition, although a water intake structure differs a little, there also exists what provided the water intake at the front-end | tip of the water intake pipe raised from the bottom of the recessed part (for example, refer patent document 1). In what is described in Patent Document 1, a sand discharge device that drives a sand discharge plate with a hydraulic jack is provided so that the downstream side of the recess is a slope, and the sand accumulated along the slope is discharged to the downstream side. Yes.

Japanese Utility Model Publication No. 61-116824

  The discharge operation of the sand accumulated in the recess in the river intake structure excavating the recess connected to the quay with the intake port described above has a problem that requires a great amount of labor and time. Although this type of river intake structure can employ the sand discharging device described in Patent Document 1, the sand discharging device becomes very expensive.

  Accordingly, an object of the present invention is to prevent sedimentation of sand in a recess by a simple and inexpensive means in a river intake structure in which a recess connected to a quay wall provided with an intake port is excavated.

  In order to solve the above-described problems, the present invention excavates a recess connected to at least one quay at the bottom of a river, and provides a water intake whose lower end is located below the upper end of the recess in the quay connected to the recess. In the river intake structure, a membrane member that covers the concave portion and a means for moving the membrane member up and down between the bottom and the upper end of the concave portion are provided, and at the time of water intake, the membrane member is lowered to the bottom of the concave portion. In some cases, a configuration was adopted in which the membrane member was raised to the upper end of the recess.

  That is, a membrane member that covers the recess connected to the quay with the intake port and means for moving the membrane member up and down between the bottom and the upper end of the recess are provided, and the membrane member is lowered to the bottom of the recess at the time of water intake. When the membrane member is raised to the upper end of the recess, the sand is prevented from sinking without lowering the flow rate of the river at the recess, and the membrane is taken into the intake water. Sand that settles and accumulates on the upper surface when the member is lowered to the bottom of the recess is allowed to flow downstream when the membrane member is raised to the upper end of the recess after water intake. It was made possible to prevent sand accumulation on the surface.

  The means for raising and lowering the membrane member is such that a fluid is supplied to the concave portion below the membrane member and the membrane member is moved up and down by the fluid pressure, so that a mechanical driving device is not provided in the concave portion. The membrane member can be moved up and down with a simple configuration.

  By making the membrane member flexible and locking its outer periphery to the side wall of the recess, the membrane member can be easily attached to the recess.

  By passing a screen member through which river water passes to the upper end of the concave portion, it is possible to prevent the membrane member from protruding above the concave portion.

  The river intake structure of the present invention is provided with a membrane member that covers a recess connected to a quay wall provided with a water intake, and a means for moving the membrane member up and down between the bottom and the upper end of the recess. Otherwise, the membrane member is raised to the upper end of the recess so that when the membrane member is raised to the upper end of the recess, the sand does not settle without lowering the flow velocity of the river at the recess. At the same time, when the membrane member is lowered to the bottom of the recess during the intake water, the sand that settles and accumulates on the upper surface is made to flow downstream when the membrane member is raised to the upper end of the recess after the intake. It is possible to prevent the sand from being deposited in the concave portion by simple and inexpensive means.

  The means for moving the membrane member up and down is to supply a fluid to the recess at the lower side of the membrane member and move the membrane member up and down by the fluid pressure without providing a mechanical driving device in the recess. The membrane member can be moved up and down with a simple configuration. It is convenient to use water or air as the fluid.

  By making the membrane member flexible and locking its outer periphery to the side wall of the recess, the membrane member can be easily attached to the recess.

  By passing a screen member through which river water passes to the upper end of the concave portion, it is possible to prevent the membrane member from protruding above the concave portion. As the screen member, a cross member, a lattice member, a mesh member, or the like can be used.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In this river intake structure, as shown in FIGS. 1 and 2, a recess 3 connected to both quays 2 a and 2 b is excavated at the bottom of the river 1, and the center is positioned at one quay 2 a at the generally upper end of the recess 3. A circular water intake 4 is provided, and the water intake 4 communicates with the water storage tank 6 through a fume pipe 5.

  A flexible membrane member 7 is attached to the concrete-plated side wall of the recess 3, and a crosspiece member 8 serving as a screen member is passed to the upper end of the flexible membrane member 7. Further, at the bottom of the recess 3, water supply ports 9 are provided at a plurality of locations in the width direction of the river 1, and these water supply ports 9 are communicated with a water supply tower 11 erected on the water storage tank 6 by a water supply pipe 10. Yes. A drainage pump 12 that discharges internal water to the water storage tank 6 is provided in the water supply tower 11, and a water supply pump 13 that supplies water to the water supply tower 11 is provided in the water storage tank 6.

  When water is not taken from the water intake 4, the water supply pump 13 is operated to raise the water level of the water supply tower 11, through the water supply pipe 11 through the water supply pipe 10, and from the water supply openings 9 to the lower side of the membrane member 7 of the recess 3. As shown in FIG. 2A, the membrane member 7 is pushed upward by the water pressure and covers the upper end of the recess 3 so as to be in close contact with the lower surface of the crosspiece member 8 as shown in FIG. At this time, since the flow velocity of the river 1 does not become slow at the concave portion 3, the sand contained in the running water does not sink.

  When water is taken from the water intake 4, the drain pump 12 is operated to lower the water level of the water tower 11, and the water supplied to the recess 3 is returned from the water pipe 10 to the water tower 11. As shown in b), the membrane member 7 is lowered to the bottom of the recess 3. At this time, the flow velocity of the river 1 becomes slow at the concave portion 3 and the sand that settles from the running water accumulates on the upper surface of the membrane member 7, but as shown by the alternate long and short dash line in the figure, the membrane member again after taking water. When 7 is pushed up to the upper end of the recess 3, the sand deposited on the membrane member 7 is caused to flow downstream.

  In the above-described embodiment, the concave portion is excavated so as to be continuous with both quay walls of the river, but the concave portion may be continuous only with the quay side where the water intake is provided. Moreover, the whole water intake may be located below the upper end of a recessed part.

  Furthermore, in the above-described embodiment, the membrane member is flexible. However, the rigid membrane member can be moved up and down so as to move in parallel between the bottom and the upper end of the recess.

Longitudinal sectional view showing an embodiment of river intake structure a and b are sectional views taken along line II-II in FIG. 1 when water is not taken and when water is taken, respectively.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 River 2a, 2b Quay wall 3 Recessed part 4 Water intake 5 Hume pipe 6 Water tank 7 Membrane member 8 Crosspiece member 9 Water supply port 10 Water supply pipe 11 Water supply tower 12 Drain pump 13 Water supply pump

Claims (4)

  In a river intake structure in which a recess connected to at least one quay is drilled in the bottom of the river and a water intake whose lower end is located below the upper end of the recess is provided in the quay connected to the recess, a membrane member that covers the recess The membrane member is provided with a means for moving up and down between the bottom and the upper end of the recess, and when taking water, the membrane member is lowered to the bottom of the recess, and otherwise, the membrane member is raised to the upper end of the recess. River intake structure characterized by that.   The river intake structure according to claim 1, wherein the means for moving the membrane member up and down supplies fluid to the concave portion below the membrane member and moves the membrane member up and down by the fluid pressure.   The river intake structure according to claim 2, wherein the membrane member is flexible and the outer periphery thereof is locked to the side wall of the recess.   The river intake structure according to any one of claims 1 to 3, wherein a screen member through which river water is passed is provided at an upper end of the recess.

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