JP2016030235A - Sand sedimentation pond - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sand sedimentation pond having a sand lifting device capable of sucking up the sedimentation sand from the entirety of a grit pit without moving a sand lifting pipe.SOLUTION: A sand sedimentation pond comprises: a plurality of injection nozzles 15 for injecting dust collecting water into a sand lifting pit 20 thereby to transfer the sedimentary sand in the sand lifting pit toward the lower end part of a sand lifting pipe 14; sand collecting water guide passages 21 and 22 leading from the injection nozzle to the lower end part of the sand lifting pipe; and umbrella-shaped components 23 and 24 for covering over the injection nozzle and the sand collecting water guide passages thereby to suppress the depositions of the sedimentary sand in the injection nozzle and the sand collecting water guide passages.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a sand settling basin, and more specifically, a sand collecting device that transfers sand settling on the bottom of the pond toward a sand pit, and a sand lifting device that has a sand raising pipe that sucks up the sand set in the sand pit together with water. Concerning a sand basin.

  In the sand basin installed in water intake facilities, sewage treatment facilities, pumping stations, etc., there are sand collectors that collect sand and pebbles that have settled at the bottom of the pond in a sand pit formed upstream of the sand basin, and a sand pit And a sand raising device for sucking up the collected sand together with water with a sand pipe and discharging it from the sand basin. As a sand collecting device, a device is known in which a large number of spray nozzles for spraying sand collecting water in the direction of a sand pit are arranged at the bottom of a sand basin. In addition, as a sand raising device, a sand raising pipe is arranged from the upper part of the sand basin to the bottom of the sand pit, and a pump is used as a driving source to suck up the sand with water from the lower end of the sand raising pipe. (For example, refer to Patent Document 1).

JP 2007-38208 A

  When the sand collecting device described in Patent Document 1 jets sand collecting water from the injection nozzle in a state where water is contained in the sand settling pond, the sand collecting water collides with the sand settling on the pond bottom, The accumulated sedimentary sand may float and float in the water, and the sand may flow out with the treated water flowing downstream from the sand basin. For this reason, when transferring the sediment deposited on the bottom of the pond by the jet of jet water, it was necessary to operate the sand collecting device after draining the water in the sand basin. In addition, in the sand raising device, it is necessary to form the sand raising pipe so as to be movable in order to suck up the sediment from the entire sand pit.

  Therefore, the present invention is equipped with a sand collecting device for transferring the sand sediment deposited on the pond bottom to the sand lifting pit and capable of sucking the sand sediment from the entire sand lifting pit without moving the sand lifting pipe. It aims to provide a sand basin equipped with.

  In order to achieve the above object, a sand basin of the present invention comprises a sand collecting device for transferring the sand deposited on the bottom of the pond to a sand pit, and a sand raising device having a sand pipe for sucking up the sand in the sand pit together with water. A plurality of injection nozzles that inject sand collection water into the sand pit and transfer the sand set in the sand pit toward the lower end of the sand pipe, and The sand collecting water guide channel reaching the lower end of the sand pipe and the upper part of the jet nozzle and the sand collecting water guide channel are covered to suppress sedimentation of sand in the jet nozzle and the sand collecting water guide channel. And an umbrella-shaped member.

  Further, in the sand basin of the present invention, the sand pit has a rectangular shape in plan view, a lower end portion of the sand raising pipe is opened at a central portion, and a center of each side wall of the sand pit is provided from the lower end portion of the sand raising pit. Center sand collecting water guide channel to the section, and side wall sand collecting bent from the front end of each central sand collecting water guide channel in the same direction to each corner of the sand pit along each side wall A sand collecting water guide channel having a bowl shape in a plan view is formed by the water guide channel, and a side wall umbrella-shaped member that is inclined upward toward each side wall is provided above each side wall sand collecting water guide channel. In addition, a central umbrella-shaped member is provided above each central sand collecting water guide channel, and jetting the sand collecting water at least at each corner of the sand pit along the side wall sand collecting water guide channel Each nozzle is provided, and the tip of the side wall umbrella-shaped member is disposed on the side of the spray nozzle of each side wall sand collecting guide channel. Is characterized in that a guide member extending in Luo Agesuna pit bottom.

  The sand settling basin of the present invention includes a plurality of spray nozzles for spraying sand collecting water for the sand collecting device to transfer the sand settling on the pond bottom toward the sand lifting pit, and the pumping from the spray nozzles. A sand collecting water guide channel that reaches a sand pit, and an umbrella-like member that covers the upper part of the jet nozzle and the sand collecting water guide channel and suppresses sedimentation of sand settling into the jet nozzle and the sand collecting water guide channel. The sand collecting water guide channel is provided at a central portion in the width direction of the sand collecting groove toward the sand pumping pit formed at the bottom of the sand basin, and the sand collecting groove The umbrella-shaped member is provided at the center in the width direction of the upper opening.

  According to the sand basin of the present invention, the sand collection water sprayed from the spray nozzle flows along the sand collection water guide channel in which the sedimentation of sand is suppressed by the umbrella-shaped member. On the other hand, the sand collected around the sand collecting water guide channel is sucked into the flow of the sand collecting water. Therefore, by forming an appropriate sand collection water guide channel in the sand pit and providing an injection nozzle, most sand settling in the sand pit can be pumped by the flow of sand collection water without moving the sand collection pipe. Can be sucked up with a sand pipe. In addition, by properly forming a sand collection water guide channel according to the state of the bottom of the sand basin and providing an injection nozzle, it is possible to collect sand using the sand collection water without draining the water in the sand basin. . In particular, by forming the sand collecting groove, it is possible to more reliably suck and transfer the sand sink into the flow of the sand collecting water.

It is a sectional side view showing the example of the 1st form of the sand basin of the present invention. It is a sectional view of a sand collection water guide channel similarly. It is a top view of the sand pit which shows the 2nd example of a sand basin of this invention. It is a top view of the sand pit in the middle of the same sanding. It is VV sectional drawing of FIG.

  1 and 2 show a first embodiment of a sand basin to which the present invention is applied. A sand basin 11 having an inflow portion 11a and an outflow portion 11b forms a sand pit 12 on the pond bottom upstream with respect to the direction of water flow, and on the pond bottom downstream of the sand pit 12. A sand collecting device 13 is provided for transferring the settling sand, pebbles and the like toward the sand pit 12. The sand raising pit 12 is provided with a sand raising device having a sand raising pipe 14 for sucking the sand collected in the sand pit 12 by the sand collecting device 13 together with water and discharging it to the outside of the sand basin 11. .

  The sand collecting device 13 has a plurality of jet nozzles 15 for jetting sand collecting water in the direction of the sand pumping pit 12, and sand collecting water guides in the jet direction of the sand collecting water from the jet nozzle 15. A flow path 16 is formed, and an umbrella-shaped member 17 that covers the spray nozzle 15 and the sand collection water guide flow path 16 is provided.

  The sand collecting water guide channel 16 shown in the present embodiment is provided in each of the center portions in the width direction of the plurality of sand collecting grooves 18 directed toward the sand pumping pit 12 formed in the bottom of the sand basin 11. The umbrella-shaped member 17 is provided at a position corresponding to the upper part of the sand collection water guide channel 16 at the center in the width direction of the upper opening of the sand collection groove 18.

  The umbrella-shaped member 17 formed in a symmetrical mountain shape prevents sand and pebbles that sink in the water in the sand basin 11 from accumulating in the jet nozzle 15 and the sand collecting water guide channel 16. Sand or the like settles in the sand collecting groove 18 from the gap 19 between both edges in the width direction of the umbrella-shaped member 17 and the side wall of the sand collecting groove 18 and accumulates on the bottom of the groove.

  By providing the umbrella-shaped member 17 as described above, the sand collection water sprayed from the spray nozzle 15 is vigorously directed toward the sand pit 12 along the sand collection water guide channel 16 below the umbrella-shaped member 17. Will be in a state of flowing. At this time, even if sedimentation is accumulated in the sand collection water guide channel 16 and the sediment collection is soared by the sand collection water, the umbrella-like member 17 prevents the sedimentation from rising upward. Sand does not flow out along with the treated water flowing out downstream through the outflow part 11b.

  Even when a large amount of sand sinks into the sand collecting groove 18, the sand does not enter the inner upper part of the umbrella-shaped member 17 whose upper part is closed. Therefore, the sand collection water jetted from the jet nozzle 15 can flow through this space, and the settling of the sand in the sand collection groove 18 is ejected outside the sand collection groove 18. Absent.

  Accordingly, the sand collection water sprayed linearly from the injection nozzle 15 to the sand collection water guide channel 16 flows under the umbrella-shaped member 17 toward the sand collection pit 12 and enters the sand collection water guide channel 16. It flows while sucking sand and sand around the sand collecting water guide channel 16 together with water. Furthermore, the sand sediment deposited on the upper surface of the umbrella-shaped member 17 can be dropped into the sand collecting groove 18 together with water and transferred toward the sand pit 12. Further, by appropriately setting the spraying order of the sand collecting water from the spray nozzles 15 in which a plurality of sand collecting water is provided at a predetermined pitch in the flow direction of the sand collecting water, Therefore, it can be reliably transported toward the sand pit 12 without flying up.

  3 to 5 show a second embodiment of the sand basin of the present invention. In this embodiment, the lower end portion of the sand raising pipe 14 is opened at the center portion of the rectangular sand pit 20 in plan view, and the lower end portion of the sand raising pipe 14 extends to the center portion of each side wall 20 a of the sand raising pit 20. The four central sand collecting water guide channels 21 and the respective central sand collecting water guide channels 21 are bent in the same direction from the tip of each central sand collecting water guide channel 21 to the corners 20b of the sand pit along the side walls 20a. The four side wall portion sand collecting water guide channels 22 form a sand collecting water guide channel having a reverse saddle shape in plan view.

  Above each side wall channel 22 is provided a side wall umbrella member 23 that is inclined upward toward each side wall 20a so that sand or the like that settles along the side wall 20a is dropped to the center side of the sand pit 20. I have to. Further, above each central channel 21, there are an inclined portion 24a having an inclination in a direction continuous to the side wall portion umbrella-like member 23, and a vertical portion 24b hanging vertically from the upper end of the inclined portion 24a. A central umbrella member 24 is provided.

  Each corner 20b of the sand pit 20 that is the end of each side wall channel 22 is provided with an injection nozzle 15 for injecting sand collection water along the side wall channel 22, and each side wall portion. A vertical guide member 25 extending from the tip of the side wall umbrella-like member 23 to the bottom of the sand pit is provided on the side of the jet nozzle 15 of the sand collecting water guide channel 22. The guide member 25 guides the flow direction of the sand collection water sprayed from the spray nozzle 15 to the center side of the sand pit 20, and the sand collection water sprayed from one spray nozzle 15 is directed to the other spray nozzles 15. I try not to hit it.

  As described above, the central sand collection water guide channel 21 and the side wall sand collection water guide channel 22 form a bowl-shaped sand collection water guide channel, and at the sand pit 20 provided with the guide member 25 3, when sand collection water is jetted from each injection nozzle 15 in a state where sand is accumulated, the sand collection water is covered by the side wall umbrella member 23 and the side wall flow is almost free of sedimentation. By flowing along the path 22 and colliding with the sedimentation accumulated in the direction of the tip of the side wall channel 22, the flow direction of the sand collecting water is the center where the sedimentation is hardly deposited below the central umbrella member 24. It bends in the direction from the partial sandwater guide channel 21 toward the lower end of the sandpipe 14.

  As the sand collecting water bends in the same manner as described above at the tip of each of the four side wall channels 22, the accumulated sand is gradually scraped from the portion where the sand collecting water collides, and accompanies the sand collecting water. It flows toward the lower end of the sand raising pipe 14, is sucked up from the lower end opening of the sand raising pipe 14, and is discharged to the outside of the sand basin 11. As the sedimentation of accumulated sediment due to the collision of the sand collection water progresses, the sand collection water collides with the guide member 25 and changes its flow direction. As a whole, the sand collection water in the sand pit 20 is mixed, In FIG. 4, a counterclockwise vortex is wound and flows through the bottom of the sand pit 20, and is sucked up from the lower end opening of the sand pipe 14.

  As shown in both examples, when a large amount of sediment is deposited around the sand collection water guide channel by providing an umbrella-shaped member with the upper end closed above each sand collection water guide channel However, since the space through which the sand collection water flows can be formed below the umbrella-shaped member, the sand collection water can be reliably transferred without hindering the flow of the sand collection water.

  In addition, about the shape and magnitude | size of an umbrella-shaped member, it can set suitably according to conditions, such as a position and pitch of an injection nozzle, the amount of sand collection water, and a pressure. In addition, there is almost no problem in the sand pit provided on the uppermost stream side of the sand basin, even if a small amount of sand is soared. It can be prevented from flowing out of the pit. In the present invention, a mechanical sand collecting device can also be used as the sand collecting device.

DESCRIPTION OF SYMBOLS 11 ... Sand basin, 11a ... Inflow part, 11b ... Outflow part, 12 ... Sand collection pit, 13 ... Sand collection apparatus, 14 ... Sand collection pipe, 15 ... Injection nozzle, 16 ... Sand collection water guide channel, 17 ... Umbrella 18 ... Sand collecting groove, 19 ... Gap, 20 ... Sand pumping pit, 20a ... Side wall, 20b ... Corner, 21 ... Central sand collecting water guide channel, 22 ... Side wall sand collecting water guide channel, 23 ... Umbrella-like member on the side wall, 24 ... Umbrella-like member on the center, 24a ... Inclined part, 24b ... Vertical part, 25 ... Guide member

Claims (4)

  In a sand settling basin comprising a sand collecting device for transferring sand settling on the bottom of the pond to a sand lifting pit and a sand lifting device having a sand lifting pipe for sucking up the sand settling in the sand pit together with water, A plurality of injection nozzles for injecting sand collection water and transferring the settling sand in the sand pit toward the lower end of the sand raising pipe, and a sand collection water guide flow from the injection nozzle to the lower end of the sand raising pipe A sand sink, comprising: a path; and an umbrella-like member that covers the jet nozzle and the sand collection water guide channel and suppresses sedimentation of the sand settling into the spray nozzle and the sand collection water guide channel pond.   The sand dumping pit has a rectangular shape in plan view, and opens a lower end portion of the sand raising pipe at a central portion, and a central sand collecting water extending from the lower end portion of the sand raising pipe to the central portion of each side wall of the sand raising pit. Plane view by the guide channel and the side sand collecting water guide channel bent in the same direction from the tip of each central sand collecting water guide channel to each corner of the sand pit along each side wall A saddle-shaped sand collecting water guide channel is formed, and a side wall umbrella-shaped member that is inclined upward toward each side wall is provided above each side wall collecting water guide channel. A central umbrella-like member is provided above the flow path, and at least each corner of the sand pit is provided with an injection nozzle for injecting sand collection water along the side wall sand collection water guide flow path, and each side wall. From the tip of the side wall umbrella-shaped member to the bottom of the sand pit on the injection nozzle side of the partial sand water guide channel Sand basin according to claim 1, characterized in that a id member.   The sand collecting device includes a plurality of injection nozzles for injecting sand collection water for transferring the sediment deposited on the bottom of the pond toward the sand pit, and a sand collection water guide flow from the injection nozzle to the sand pit. And a umbrella-like member that covers the upper side of the jet nozzle and the sand collecting water guide channel and suppresses sedimentation of sand settling into the jet nozzle and the sand collecting water guide channel. Item 3. A sand basin according to item 1 or 2.   The sand collection water guide channel is provided in the center in the width direction of the sand collection groove formed in the bottom of the sedimentation basin toward the sand pumping pit, and the center in the width direction of the upper opening of the sand collection groove 4. The sand basin according to claim 3, wherein the umbrella-shaped member is provided on the sand basin.

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