JP2005342568A - Precipitate removing apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a precipitate removing apparatus in which the removal efficiency of a precipitate is improved by promoting the smooth precipitation/accumulation of the precipitate in a recovery ditch and preventing the diffusion of the precipitate when the precipitate is removed. <P>SOLUTION: The precipitate recovery ditch 10 whose upper surface is opened and whose cross section is made semicircular is arranged at the bottom 1a of a sedimentation basin 1. A rotary pipe 12 having a semi-cylindrical part, with which the upper opening of the recovery ditch 10 can be opened/closed and which is held along an inner peripheral wall of the recovery ditch 10 when the upper opening of the recovery ditch is opened and forms a closed space 13 having a circular shape in the cross section in company with the recovery ditch 10 when the upper opening of the ditch is closed, is arranged to be slid freely in the peripheral direction inside the recovery ditch 10. A pipe driving mechanism is arranged for rotary driving the rotary pipe 12 between an opened position and a closed position. A high-pressure water nozzle 51 is arranged from which high pressure water is jetted into the closed space 13, so that the precipitate F closed in the closed space 13 is discharged to the outside from the end part of the recovery ditch 10. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a removal device (e.g., a sand removal device) for deposits (such as sedimentation and sludge) in a storage pond such as a sand basin.

  For example, a sand basin such as a sewage treatment plant is generally provided with a sand removal device for removing sand deposited and deposited on the bottom of the pond. As this sand removal device, a large number of high-pressure water nozzles for sand collection are installed at the bottom of the sand basin, and high pressure water is sprayed from the high-pressure water nozzle to blow off the sand at the bottom of the pond and form a sand pool. There is a type that collects sand in the sand collection pit and transports the settling sand collected in the sand collection pit to the floor with a sand pump using a jet jet.

  However, even if high-pressure water is simply sprayed from a large pond bottom and the sand is blown away, the sand is diffused and the sand removal efficiency does not increase. In addition, since a large range of water must be affected, it was necessary to spray a large amount of water.

Therefore, in order to alleviate such problems, it has been proposed that a shielding plate is disposed above the high-pressure water nozzle in the collection groove to prevent the sedimentation of the sand and increase the sand collecting efficiency. ing. In addition, there is also a type in which the shielding plate is movable like a blade so that a gap in which the sand settles is widened during sand settling and can be narrowed during sand removal (see, for example, Patent Document 1).
Japanese Utility Model Publication No. 64-56807

  However, since there are still many gaps between the shielding plate and the edge of the collection groove, the influence of the high-pressure water sprayed from the high-pressure water nozzle tends to reach the outside, making it difficult to reliably suppress the sedimentation of sand. Met. In addition, since it is inevitable that high-pressure water leaks to the outside, it is necessary to supply pressure water at a considerably high pressure.

  In consideration of the above circumstances, the present invention can prevent the sediment from spreading during removal while promoting smooth sedimentation of the sediment in the collection groove, thereby improving the sediment removal efficiency. In addition, an object of the present invention is to provide a deposit removing device that can set the pressure and the amount of high-pressure water to be low and can reduce the power load.

  According to the first aspect of the present invention, a sediment collecting groove having a semicircular cross section having an upper surface opened is provided at the bottom of the reservoir, and the upper surface opening of the collecting groove can be opened and closed inside the sediment collecting groove. A rotating pipe having a semi-cylindrical portion which is held in a state along the inner peripheral wall of the recovery groove when in the open position and forms a closed space having a circular cross section together with the recovery groove when in the closed position. A pipe drive mechanism that is slidably arranged and further rotates the rotary pipe between the open position and the closed position, and also injects high-pressure water in the closed space, A high-pressure water nozzle is provided to discharge the sediment trapped in the outside from the end of the sediment recovery groove.

  The invention of claim 2 is characterized in that, in claim 1, the semi-circular sediment collecting groove having an open upper surface is constituted by a half pipe embedded in the bottom of a reservoir.

  According to a third aspect of the present invention, in the first or second aspect, an accumulation pit for collecting sediment discharged from an end of the sediment recovery groove is provided at the bottom of the reservoir, and the accumulation pit is provided in the accumulation pit. It is characterized in that a transfer pump for lifting the accumulated sediment using high-pressure water energy is provided.

  According to a fourth aspect of the present invention, in any one of the first to third aspects, an open / close valve is provided at an end of the closed space.

  A fifth aspect of the present invention is the method according to any one of the first to fourth aspects, wherein a plurality of the sediment recovery grooves are arranged in parallel at the bottom of the reservoir, and all the sediments are disposed at the end of the sediment recovery groove. A screw conveyor that feeds and moves the sediment discharged from the collection groove in a fixed direction along the bottom of the reservoir is arranged, and the inlet of the pump feed pipe is arranged at the tip in the feed direction of the screw conveyor. Features.

  A sixth aspect of the present invention provides the method according to any one of the first to fourth aspects, wherein a plurality of the sediment recovery grooves are arranged in parallel at the bottom of the reservoir, and the entire sediment is disposed at the end of the sediment recovery groove. A screw conveyor that moves and moves the sediment discharged from the collecting groove in a certain direction along the bottom of the storage pond is disposed, and an inlet of the feed pipe is disposed opposite the tip of the screw conveyor in the feeding direction, The axis of the rotation axis of the screw conveyor and the axis of the inlet of the lifting pipe are substantially coincided with each other, the rotation axis of the screw of the screw conveyor is a hollow shaft, the inside is a pressure water supply path, and the tip of the rotation axis in the feed direction In addition, an ejection nozzle that ejects the pressure water that has passed through the pressure water supply path is formed in front of the rotation axis in the axial direction, and the ejection nozzle is inserted into the inlet of the pumping pipe.

  In the invention of claim 1, when the flow of the raw water flowing into the storage pond becomes gentle, sediment (sludge, sedimentation, etc.) settles on the bottom of the pond. At the bottom of the reservoir, a sediment collecting groove is provided with the top opening facing upward, and the semi-cylindrical part of the rotating pipe is held at an open position along the inner peripheral wall of the collecting groove. When the upper surface opening is opened, the precipitate enters the collection groove and is deposited. When the rotating pipe is rotated approximately halfway to the closed position when the accumulation exceeds a certain level, the semi-cylindrical part of the rotating pipe closes the top opening of the collecting groove and is formed by the collecting groove and the semi-cylindrical part of the rotating pipe. The sediment is confined in the closed space. When high-pressure water is jetted from the high-pressure water nozzle in this state, the sediment trapped in the closed space is pushed away by the high-pressure water and discharged to the outside.

  Here, since the high pressure water is injected inside the closed space, there is little influence of the high pressure water from the high pressure water nozzle on the outside, so even when there is a flow in the reservoir, it was blown off by the nozzle. The sediment does not diffuse again in the upper part of the pond, and the sediment removal efficiency is improved. In addition, since leakage of high-pressure water outside the closed space can be reduced as much as possible, the injection pressure and the amount of water to be injected can be set low, and power can be reduced. When the sediment settles and accumulates in the recovery groove, the upper space of the recovery groove is opened by rotating the semi-cylindrical portion of the rotating pipe (the portion that functions as a shielding member or a lid) to open the upper surface opening of the recovery groove. Since the obstacle can be completely removed from the slag, smooth sedimentation of the sediment into the collection groove can be promoted.

  The sediment collecting groove can be formed as it is on the concrete surface constituting the bottom wall of the reservoir, but in the invention of claim 2, the half pipe in which the sediment collecting groove is embedded in the reservoir bottom of the reservoir It consists of. In this way, when the half pipe is buried in the pond bottom, the sediment collecting groove having a semicircular cross section can be easily configured, so that the equipment cost can be further reduced. Moreover, since the inner peripheral surface of the existing half pipe is made smoother than the concrete surface, the rotating pipe can be smoothly rotated. In addition, it is preferable from the viewpoint of cost to use a steel pipe processed as a half pipe, but other metal pipe processed pipes or pipes made of other materials such as resin can be processed. You may use what you did.

  In the invention of claim 3, since the energy of the high pressure water is used to lift the sediment accumulated in the accumulation pit, it is injected from the high pressure water nozzle as a high pressure water source for the sediment transportation. The same high-pressure water source (pressure pump) as high-pressure water can be used, and the equipment can be simplified. In addition, because the condition of high-pressure water injection from the nozzle in the closed space is established, energy can be saved by setting the injection pressure and the amount of water to be low, so when using the same high-pressure water source, another high-pressure water source can be used. Even in the case of use, the discharge of the precipitate using the high-pressure water from the collection groove and the lifting of the precipitate using the high-pressure water can be performed simultaneously rather than alternately. Therefore, the operation time of the high-pressure water source can be shortened, and as a result, power consumption can be suppressed. Moreover, since the amount of sediment accumulated in the accumulation pit can be reduced by simultaneously discharging the sediment from the collection groove and transporting the sediment to the floor, only a shallow accumulation pit is provided at the bottom of the pond. It can be preferably applied even when the bottom of the reservoir is shallow.

  According to the invention of claim 4, since the end of the closed space formed by the sediment collecting groove and the rotary pipe can be appropriately closed by the valve, high pressure water is injected from the high pressure water nozzle in the closed state. By stopping the flow, a high-pressure water flow can be strongly ejected from the gap in the closed space to the outside. The effect of breaking the state can be expected.

  When the reservoir is wide, multiple sediment collecting grooves are arranged in parallel, so the sediment is discharged from the collecting groove over a wide width, and is discharged from the collecting groove by one pump. It becomes difficult to lift the sediment onto the floor. Therefore, in the invention of claim 5, the screw conveyor is arranged so that all the sediments discharged from the plurality of sediment recovery grooves can be collected in a certain direction. Thus, by arranging the screw conveyor for accumulating the sediment in a certain direction on the bottom of the pond, the sediment can be transported to the floor with a single pump even in a wide storage pond.

  According to the invention of claim 6, the sediment discharged from the collecting groove is sent out toward the inlet of the lifting pipe by the screw conveyor at the bottom of the pond, and the high pressure water from the spray nozzle at the tip of the screw is passed through the lifting pipe. Since it is pumped onto the floor, quantitative and smooth transfer is possible. In addition, a mechanical screw is used to draw the sediment (collection from the surroundings to the inlet of the lifting pipe), so it is only necessary to secure the minimum pressure required for high-pressure water for pumping, and the total power load can be reduced. It can be reduced and the running cost can be reduced. Moreover, since the deposit sent out by the screw is directly introduced into the inlet of the lifting pipe, the accumulation pits can be eliminated. In addition, since a pressure water supply path is secured in the rotating shaft of the screw, the structure of the pumping section using the screw conveyor and jet jet can be made compact, and the integrated pit can be made unnecessary. Can be reduced.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a configuration diagram of a main part of a sand removal device (precipitate removal device) in a sand basin as an embodiment of the present invention. (C) is the same cross-sectional view during sedimentation. 2 is an enlarged cross-sectional view showing the structure of the fixed pipe and the rotating pipe installed at the bottom of the sand basin, FIG. 3 is a perspective view showing the fixed pipe and the rotating pipe taken out, and FIG. (B) is a main part block diagram at the time of closing, (c) is a whole block diagram showing the relationship between the fixed pipe and the rotating pipe. 4 is a cross-sectional view showing the rotation support structure of the rotary pipe, FIG. 5 is a cross-sectional view taken along the line V-V in FIG. 4, and FIG. 6 is a cross-sectional view taken along the line VI-VI in FIG.

  A sedimentation basin 1 shown in FIG. 1A is a sedimentation basin in a sewage treatment system, and raw water flows in from the left side of the figure and exits from the right side. In the pond bottom 1a of the sand basin 1, a half-shaped fixed pipe 11 constituting a sediment collecting groove 10 having a semicircular cross section with an open top surface is embedded. A plurality of the fixed pipes 11 are installed in parallel to the flow direction of the raw water at predetermined intervals. As shown in FIG. 3 (c), each fixed pipe 11 is configured as a semi-cylindrical portion 11a in which the upper part of the longitudinal center is open, and only both ends are configured as a full-circular cylindrical portion 11b. Yes. The entire cylindrical portion 11b may also be configured by previously halving the pipe and assembling the upper semicylindrical portion to the lower semicylindrical portion later.

  As shown in FIG. 2, the half-shaped fixed pipe 11 constituting the sediment collecting groove 10 is embedded in the bottoms of the both side inclined walls 1b and 1b constituting the pond bottom 1a, and the sediment ( Here, all of the settling sand) F is collected in the deposit collecting groove 10. Thus, when the half-shaped fixed pipe 11 is embedded in the concrete bottom wall of the pond bottom 1a, the sediment collecting groove 10 having a semicircular cross section can be easily formed in the pond bottom 1a, thereby reducing the equipment cost. There are advantages you can do. Moreover, since the inner peripheral surface of the fixed pipe 11 of the ready-made product is made smoother than the concrete surface, the advantage that the rotating pipe 12 mentioned later can be rotated smoothly is acquired. As the fixed pipe 11, for example, it is preferable in terms of cost to use a steel pipe processed, but other metal pipe processed may be used, or a pipe made of other materials such as resin may be used. You may use what was processed.

  A rotary pipe 12 is disposed inside the sediment collecting groove 10 constituted by the half-shaped fixed pipe 11 so as to be rotatable and slidable in the circumferential direction indicated by an arrow A in FIG. As shown in FIG. 3, the rotary pipe 12 includes a semi-cylindrical portion 12a capable of opening and closing an upper surface opening of the semi-cylindrical portion 11a of the fixed pipe 11, and an all-round cylindrical portion 12b for maintaining a pipe shape. have. The all-round cylindrical portion 12b is a portion that is rotatably supported by the bearing mechanisms 15A, 15B, and 15C shown in FIG. 4, and is provided at both ends in the longitudinal direction and at several places with appropriate intervals between the both ends. A portion other than the cylindrical portion 12b is a semi-cylindrical portion 12a.

  As shown in FIGS. 4 and 5, the bearing mechanisms 15A, 15B, and 15C are rotatably mounted on the bearing housings 16A, 16B, and 16C and the bearing housings 16A, 16B, and 16C so as to rotatably support the rotary pipe 12. Bearings 17A, 17B, and 17C. As the bearings 17A, 17B, and 17C, for example, sliding bearings such as lining materials can be used.

  The rotary pipe 12 functions to open and close the upper surface opening of the sediment collection groove 10 by the semi-cylindrical part 12a depending on the rotation position. When in the open position shown in FIGS. 1 (c) and 3 (a), it is held in a state along the inner peripheral wall of the collection groove 10, and the sediment F can be accumulated. 1B and FIG. 3B, a closed space 13 having a circular cross section is formed together with the recovery groove 10.

  As shown in FIG. 4, on the one end side in the longitudinal direction of the rotary pipe 12 (in this example, the upstream side in the flow direction of the raw water, but it may be the downstream side), the rotary pipe 12 is opened and closed. A pipe drive mechanism 20 is provided for rotationally driving between the positions. As shown in FIG. 6, the pipe drive mechanism 20 includes a motor 21 provided in the upper part of the sand basin 1, a transmission shaft 22 that transmits the rotation of the motor 21, and the rotation of the transmission shaft 22. The worm pinion 23 and the worm wheel 24 are converted into The worm pinion 23 and the worm wheel 24 are mounted on the housing 16A of the bearing mechanism 15A that supports one end of the rotary pipe 12.

  Further, as shown in FIG. 1, high-pressure water nozzles 51 are installed in a plurality of locations at intervals in the longitudinal direction inside the fixed pipe 11 so as not to hinder the opening / closing operation of the rotary pipe 12. ing. These high-pressure water nozzles 51 remove the sediment (sedimentation) F trapped in the closed space 13 formed by the rotary pipe 12 and the fixed pipe 11 while the rotary pipe 12 is moved to the closed position. The liquid is discharged from the end of the fixed pipe 11 by spraying, and is connected to the high-pressure water pipe 50 through a valve 55. For example, as shown in FIGS. 2 and 3, the high-pressure water pipe 50 is disposed on the upper edge of the semi-cylindrical portion 11 a of the fixed pipe 11 so as not to interfere with the opening / closing operation of the rotary pipe 12. As described above, the pipe-shaped sand removal mechanism M1 is configured.

  A sand collecting pit (accumulating pit) 3 for accumulating the sediment F discharged from the end of the fixed pipe 11 is provided at the bottom of the sand basin 1. At the bottom of the sand collecting pit 3, there is provided a jet-jet transfer pump 53 that uses the energy of high-pressure water to lift the accumulated sediment F to the floor via a lifting pipe 60. A transfer pump 53 is connected to the high-pressure water pipe 50 through the valve 56 in the same manner as the high-pressure nozzle 51.

Next, the operation will be described.
When the flow of raw water flowing into the sand basin 1 becomes gentle, the sand sediment (precipitate) F sinks to the pond bottom 1a. A sediment collecting groove 10 with an opening facing upward is provided on the pond bottom 1a of the sand basin 1. As shown in FIGS. 1 (c) and 3 (a), a semi-cylinder of the rotary pipe 12 is provided. When the portion 12a is held at the open position along the inner peripheral wall of the collection groove 10 and the upper surface opening of the collection groove 10 is opened, the precipitate F enters the collection groove 10 and is deposited.

  When it is determined that the deposition of a certain level or more has progressed, when the rotating pipe 12 is rotated approximately half to the closed position shown in FIGS. 1B and 3B, the semi-cylindrical portion 12a of the rotating pipe 12 is recovered into the collecting groove 10. The top surface opening portion is closed, and the precipitate F is confined in the closed space 13 formed by the recovery groove 10 and the semi-cylindrical portion 12a of the rotary pipe 12.

  In this state, when the valve 55 is opened and high pressure water is injected from the high pressure water nozzle 51, the precipitate F trapped in the closed space 13 is pushed away by the high pressure water and discharged to the outside. Here, since the high-pressure water is injected inside the closed space 13, the influence of the high-pressure water from the high-pressure water nozzle 51 is less likely to reach the outside. Therefore, even when there is a flow in the sand basin 1, the nozzle 51 The sediment F blown away by the above will not diffuse again in the upper part of the pond, and the sediment removal efficiency is improved.

  Further, since the closed space 13 composed of the fixed pipe 11 and the rotating pipe 12 can be formed with as little gap as possible, leakage of high-pressure water to the outside of the closed space 13 can be reduced, and the injection pressure and the amount of injection water can be reduced. Can be set low, and power can be reduced. Further, as shown in FIG. 1C and FIG. 3A, when the sediment settles and accumulates in the collection groove 10, the semi-cylindrical portion 12a of the rotating pipe 12 (a portion that functions as a shielding member or a lid). Is rotated to open the upper surface opening of the collection groove 10, so that obstacles can be almost completely eliminated from the space above the collection groove 10, and smooth sedimentation of the precipitate into the collection groove 10 can be promoted. .

  Further, the energy of the high-pressure water is used to lift the sediment F accumulated in the sand collecting pit 3, and the high-pressure water supply passage of the transfer pump 53 is supplied to the high-pressure water nozzle 51. Since it is connected to the high-pressure water pipe 50, the equipment can be simplified. Further, as described above, since the power for supplying high-pressure water to the high-pressure water nozzle 51 can be reduced (reduction of injection load), sand removal and sand removal can be performed simultaneously instead of alternately. The operation time of the water source (pressure pump) can be shortened. Even when the pressure pump for supplying high-pressure water to the high-pressure water nozzle 51 and the pressure pump for supplying high-pressure water to the jet-jet transfer pump 53 are different, the former load Can reduce the total equipment cost and running cost.

  Moreover, since the amount of sediment F accumulated in the accumulation pit 3 can be reduced by simultaneously discharging the sediment from the collecting groove 10 and transporting the sediment onto the floor, the shallow accumulation at the bottom of the pond. It is only necessary to provide a pit, and it can be preferably applied even when the bottom of the sand basin is shallow.

  In addition, as shown in FIG. 7, you may provide the opening-and-closing valve 70 in the edge part by the side of the sand collection pit 3 of the fixed pipe 11 which comprises the closed space 13. As shown in FIG. In this way, the end of the closed space 13 can be appropriately closed by the opening / closing valve 70, and therefore, by injecting high-pressure water from the high-pressure water nozzle 51 in the closed state, the gap ( For example, a high-pressure water flow can be strongly ejected to the outside from the gap between the fixed pipe 11 and the rotating pipe 12, thereby allowing the sediment that has accumulated in the surroundings due to sedimentation to be consolidated and blown away. The effect of breaking the consolidated state can be expected.

  In addition, when the sand basin 1 is wide, a large number of pipe-shaped sand removal mechanisms M1 (consisting of fixed pipes 11 and rotating pipes 12) are arranged in parallel. It will be discharged | emitted from a collection groove | channel, and it will become difficult to lift a deposit on a floor | bed with one transfer pump (jet jet pump). In such a case, a screw conveyor may be arranged in the sand collection pit so that all the sediments discharged from the plurality of sediment collection grooves are collected toward the suction port of the transfer pump.

  In that case, it is also possible to use a sand raising device in which a screw conveyor for collecting sand and a jet-jet pump are integrally configured. FIG. 8 shows a pond bottom 1a of a sand basin 1 equipped with such a sand raising device M2. In this sand removal device, a plurality of pipe-type sand removal mechanisms M1 including the fixed pipe 11, the rotary pipe 12, the high-pressure water nozzle 51 and the like are arranged in parallel on the pond bottom 1a, and the ends of these sand removal mechanisms M1 are arranged. In the section, there is disposed a sand lifting device M2 that feeds and moves sediments discharged from all the sand removal mechanisms M1 in a certain direction along the pond bottom 1a and lifts them up on the floor. In this case, the sand collecting pit is omitted, and the sand lifting device M2 is installed at the same height as the sand removal mechanism M1.

  As shown in the detailed configuration in FIG. 9, the sand raising device M <b> 2 arranges a screw conveyor 81 that moves the sediment discharged from the total sand removal mechanism M <b> 1 in a certain direction on the pond bottom 1 a, and The inlet 92 of the lifting pipe 91 is disposed so as to face the tip in the feeding direction, the axis of the rotary shaft 82 of the screw conveyor 81 and the axis of the inlet 92 of the lifting pipe 91 are substantially coincided, and the screw 83 of the screw conveyor 81 is The rotary shaft 82 is a hollow shaft, and the inside of the rotary shaft 82 is a pressure water supply path 82a. The pressure water that has passed through the pressure water supply path 82a is jetted to the front end of the rotary shaft 82 in the axial direction. An ejection nozzle 90 is formed, and the ejection nozzle 90 is inserted into an inlet 92 of the lifting pipe 91.

  The screw conveyor 81 rotates the shaft 84 and a screw 84 formed of a spiral blade 83 provided on the outer periphery thereof, a bearing 85 that cantilever-supports the base end portion of the rotation shaft 82 of the screw 84, and the screw 84. And a rotational drive mechanism 86. The rotation drive mechanism 86 includes a motor 86a installed on the ground, a rod 86b that transmits the rotation of the motor 86a, and a gear box 86c that transmits the rotation of the rod 86a to the screw 84.

  The rotating shaft 82 of the screw 84 is formed of a hollow pipe, and the inside thereof is a pressure water supply path 82a. The base end of the rotary shaft 82 is connected to the high-pressure water pipe 50 via a swivel joint (rotatable pipe joint) 87. Further, the inlet 92 of the lifting pipe 91 formed in a conical shape is disposed to face the tip of the screw 84, and the ejection nozzle 90 at the tip of the rotating shaft 82 is connected to the cone-shaped feeding pipe inlet 92. Only appropriate dimensions are inserted. The spiral blade 83 at the tip of the screw 84 is placed along the conical inner peripheral surface of the lifting pipe inlet 92 with a minute gap.

  In this case, the screw 84 is housed inside a cylindrical casing 98 whose tip is continuous with the feed pipe inlet 92, and each tip of the fixed pipe 11 of the sand removal mechanism M1 is connected to the body of the cylindrical casing 98. Is good.

  By providing the sand lifting device M2 in which such a screw and a pressure pump are integrated, the sediment discharged from the sand removal mechanism M1 is sent out toward the feed pipe inlet 92 by the screw conveyor 81, and the screw 84 It can be pumped to the floor through the lifting pipe 91 by the energy of the high pressure jet water from the spray nozzle 90 at the tip. Therefore, quantitative and smooth transfer is possible. In addition, since the mechanical screw 84 is used to draw the sediment (collection from the surroundings to the lifting pipe inlet 92), it is only necessary to secure the minimum pressure necessary for the high pressure water, and the total power The load can be reduced and the running cost can be reduced. Moreover, since the deposit sent out by the screw 84 is directly introduced into the inlet 92 of the pumping pipe 91, an accumulation pit can be made unnecessary, and it can also be applied to a shallow sand basin. Moreover, since the pressure water supply path 82a is secured in the rotary shaft 82 of the screw 84, the structure of the pressure conveyor using the screw conveyor 81 and the jet jet can be made compact, and the accumulation pit can be made unnecessary. In addition, the equipment cost can be reduced.

  In addition, although the case where this invention was applied to the sand removal apparatus of a sand basin was shown in the said embodiment, it is also possible to apply the deposit removal apparatus of this invention to another storage pond other than a sewage treatment system. The deposit removing apparatus of the present invention can also be applied to other facilities.

  Moreover, although the said embodiment described the case where the sediment collection | recovery groove | channel 10 was comprised by embedding a half-shaped pipe (fixed pipe 11) in the concrete wall of the pond bottom 1a, it comprises the bottom wall of a sand basin. It is also possible to form a sediment collecting groove as it is on the concrete surface.

  Moreover, in the said embodiment, although the case where the high-pressure water piping 51 provided with the high-pressure water nozzle 51 was arrange | positioned in the upper edge of the semi-cylindrical part 11a of the fixed pipe 11 was shown, it is shown to FIG. 10 (a), (b). As shown, the high-pressure water pipe 51 may be arranged at the center of the fixed pipe 11. Moreover, as shown in the figure, an outer flange-shaped rubber scraper 12e may be attached to both ends of the semi-cylindrical portion 12a of the rotary pipe 12. In such a case, when the rotary pipe 12 is rotated in the collection groove 10, the sediment accumulated in the gap between the rotary pipe 12 and the collection groove 10 can be scraped off, and the role of preventing the settling of sand into the gap. Can also fulfill.

It is a principal part block diagram of the sand removal apparatus (sediment removal apparatus) in the sand basin as embodiment of this invention, (a) is a sectional side view, (b) is sectional drawing seen from the front at the time of sand removal. (C) is sectional drawing seen from the front at the time of sedimentation. It is sectional drawing which expands and shows the structure of the fixed pipe and rotation pipe with which the pond bottom of the sand basin in the same embodiment was equipped. FIG. 3 is a perspective view showing the fixed pipe and the rotating pipe taken out, (a) is a main part configuration diagram when opened, (b) is a main part configuration diagram when closed, and (c) is an entire configuration of the fixed pipe and the rotating pipe. FIG. It is sectional drawing which shows the rotation support structure of the said rotation pipe. It is a VV arrow sectional view of Drawing 4. It is VI-VI arrow sectional drawing of FIG. It is sectional drawing which shows the structural example which provided the opening-and-closing valve at the front-end | tip of the said fixed pipe. It is a block diagram of the sand removal apparatus of another embodiment of this invention, (a) is a sectional side view, (b) is a top view, (c) is sectional drawing seen from the front direction. It is a figure which shows the detailed structure of the sand lifting apparatus M2 of FIG. 8, (a) is a general view, (b) is a principal part enlarged view. It is a principal part block diagram of the sand removal apparatus of another embodiment of this invention, (a) is an open state, (b) is a perspective view (upper figure) and sectional drawing (lower figure) which show a closed state. is there.

Explanation of symbols

1 Sedimentation basin (reservoir)
1a pond bottom 3 sand collecting pit 10 sediment collection groove 11 fixed pipe (half pipe)
DESCRIPTION OF SYMBOLS 12 Rotating pipe 12a Semi-cylindrical part 13 Closed space 20 Pipe drive mechanism 51 High-pressure water nozzle 53 Transfer pump 70 Opening and closing valve 81 Screw conveyor 82 Rotating shaft 84 Screw 82a Pressure water supply path 90 Jet nozzle 91 Lifting pipe 92 Inlet F Precipitate M1 Sand removal mechanism M2

Claims (6)

  A sediment collecting groove having a semicircular cross section with an open upper surface is provided at the bottom of the reservoir, and the upper surface opening of the collecting groove can be opened and closed inside the sediment collecting groove. A rotary pipe having a semi-cylindrical portion that is held in a state along the inner peripheral wall of the recovery groove and forms a closed space with a circular cross section together with the recovery groove when in the closed position is slidably disposed in the circumferential direction, In addition, a pipe drive mechanism for rotating the rotary pipe between the open position and the closed position is provided, and the sediment trapped in the closed space is ejected by injecting high-pressure water in the closed space. A sediment removing apparatus comprising a high-pressure water nozzle for discharging the sediment from the end of the sediment collecting groove.   The sediment removing device according to claim 1, wherein the sediment collecting groove having a semicircular cross section having an open upper surface is constituted by a half pipe embedded in a bottom of a reservoir.   An accumulation pit for accumulating the sediment discharged from the end of the sediment collection groove is provided at the bottom of the reservoir, and the sediment accumulated in the accumulation pit is pumped up using high-pressure water energy. The deposit removing apparatus according to claim 1, further comprising a transfer pump for feeding.   The deposit removing device according to any one of claims 1 to 3, wherein an opening / closing valve is provided at an end of the closed space.   A plurality of the sediment recovery grooves are arranged in parallel at the bottom of the reservoir, and the sediment discharged from all the sediment recovery grooves is arranged along the bottom of the reservoir at the end of the sediment recovery groove. The sediment removal according to any one of claims 1 to 4, wherein a screw conveyor that moves in a fixed direction is arranged, and an inlet of a pumping pipe is arranged at a tip of the screw conveyor in the feeding direction. apparatus.   A plurality of the sediment recovery grooves are arranged in parallel at the bottom of the reservoir, and the sediment discharged from all the sediment recovery grooves is arranged along the bottom of the reservoir at the end of the sediment recovery groove. A screw conveyor that moves in a fixed direction is arranged, an inlet of the lifting pipe is arranged opposite to the tip of the screw conveyor in the feeding direction, and the axis of the rotation axis of the screw conveyor and the axis of the inlet of the feeding pipe are arranged. The rotation axis of the screw of the screw conveyor is a hollow shaft and the inside is a pressure water supply path, and the pressure water supply path is passed forward of the rotation axis in the axial direction of the rotation axis at the front end of the rotation axis. The deposit removing apparatus according to any one of claims 1 to 4, wherein a jet nozzle for injecting the pressure water is formed, and the jet nozzle is inserted into an inlet of the pumping pipe.

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