JP6196526B2 - Blocking prevention device for sand pipe and sand lifting device - Google Patents

Description

  The present invention relates to a sand pumping device that efficiently sucks and transports sand together with a liquid, and in particular, sand settling (sedimentable sand) deposited in a sand settling pond installed in a sewage treatment facility or a pumping station by vacuum suction. The present invention relates to a sand raising apparatus that sands together with liquid and transports it to a collection tank.

  Liquid containing sedimentary sand is collected in a sand basin by a sand collecting device and transferred to a collection tank through a sandpipe. However, when a large amount of sand is accumulated in the sand basin, many parts of the sand pipe are buried in the sand and a large amount of sand flows into the sand pipe at a high concentration. For this reason, the fluidity of the sand is lost, and the sand raising pipe may not be able to suck the sand. Moreover, when high-density sedimentation is sucked, the sandpipe may be clogged with sand or may be worn earlier than expected.

Japanese Patent No. 4782059

The present invention has been made to solve the above-described conventional problems, and even when a large amount of sand is accumulated in a sand basin, the sand pump is not clogged with sand. An object of the present invention is to provide a sand pipe blockage prevention device.
Moreover, an object of this invention is to provide the sand raising apparatus provided with such an obstruction | occlusion prevention apparatus.

In order to achieve the above-described object, one aspect of the present invention is an obstruction prevention device for preventing obstruction of a sand raising pipe that sucks up sand accumulated in a sand basin, and is disposed so as to surround the sand raising pipe. A water guide tube installed in the sand basin, the upper end of the water guide tube being higher than the height of the sand accumulation layer formed in the sand basin and positioned below the water surface of the sand basin The lower end of the water guide tube is located in the sand accumulation layer, and is located above the suction port of the sand raising pipe .

In a preferred aspect of the present invention, the lower end of the water conduit is located in the vicinity of the suction port of the sand pipe.

In a preferred aspect of the present invention, the apparatus further includes a lifting device that moves the water guide tube up and down relatively with respect to the sandpipe.
In a preferred aspect of the present invention, the lifting device is disposed above the water surface of the sand basin.
A preferred aspect of the present invention is characterized by further comprising an air injection line for injecting compressed air into the sandpipe and discharging the compressed air from a suction port of the sandpipe.
In a preferred aspect of the present invention, the water guide tube is composed of a plurality of divided bodies divided along the longitudinal direction thereof.

  Another aspect of the present invention is characterized by comprising a sand raising pipe that sucks up sand accumulated in a sand basin, a recovery tank that collects the sand sucked up by the sand raising pipe, and the clogging prevention device. It is a sand lifting device.

  According to the present invention, the water guide tube appropriately dams the sand in the sand basin, thereby preventing the sandpipe from being buried excessively. In addition, when the sand pipe sucks sand, water in the settling basin is introduced into the water guide tube from the upper end of the water guide tube, and the density of the sand settling in the water guide tube is reduced. Therefore, it is possible to prevent the sand pipe from being blocked by sand.

It is a figure which shows one Embodiment of the sand lifting apparatus of this invention. FIG. 2 is an enlarged view of a water guide tube and a sand pipe shown in FIG. 1. It is a figure for demonstrating operation | movement of a sand raising apparatus. It is a figure for demonstrating operation | movement of a sand raising apparatus. It is a figure for demonstrating operation | movement of a sand raising apparatus. It is a figure which shows embodiment of the obstruction | occlusion prevention apparatus provided with the raising / lowering apparatus for moving a water guide cylinder up and down. It is a figure which shows embodiment of the obstruction | occlusion prevention apparatus provided with the air injection line for stirring the sedimentation sediment deposited on the pond bottom. It is a perspective view which shows the water conveyance pipe | tube comprised from the division body.

  Hereinafter, embodiments of a sand lifting apparatus according to the present invention will be described in detail with reference to the drawings. FIG. 1 is a view showing an embodiment of the sand raising apparatus of the present invention. As shown in FIG. 1, the sand raising device includes a sand raising pipe 2 that sucks up sand accumulated in the sand basin 1 and a recovery tank 10 that collects the sand sucked up by the sand raising pipe 2. The sand pipe 2 has a suction port 2 a at one end, and the suction port 2 a is submerged in the water in the sand basin 1. The other end of the sand pipe 2 is connected to the recovery tank 10.

  A vacuum device 12 is connected to the recovery tank 10, and when the inside of the recovery tank 10 is depressurized by this vacuum device 12, a vacuum is formed in the sand raising pipe 2, and the sand settling (sedimentable sand) in the sand settling basin 1 is generated. It is sucked up through the sand pipe 2 and transferred to the recovery tank 10. A sand discharge valve 10 a for discharging the sand collected in the collection tank 10 is provided at the lower part of the collection tank 10.

  An air release pipe 16 provided with an air release valve 15 is connected to the sand raising pipe 2. The air release pipe 16 is connected to the sand raising pipe 2 at a connecting portion 16a located slightly (100 mm to 1000 mm) above the highest water level HWL of the sand basin 1. When the atmosphere release valve 15 attached to the atmosphere release pipe 16 is opened, the connecting portion 16a between the sand raising pipe 2 and the atmosphere release pipe 16 is opened to the atmosphere. A controller 20 is connected to the atmosphere release valve 15, and the opening and closing of the atmosphere release valve 15 is controlled by the controller 20.

  In the settling basin 1, a water guide tube 6 is disposed so as to surround the sandpipe 2. The sand pipe 2 and the water guide tube 6 are arranged concentrically. The upper end 6 a of the water guide cylinder 6 is higher than the height of the sand accumulation layer formed in the sand basin 1 and is located below the water surface of the sand basin 1. The lower end 6 b of the water guide tube 6 is located in the vicinity of the suction port 2 a of the sand pipe 2. In the example shown in FIG. 1, the lower end 6 b of the water guide tube 6 is located in the sand accumulation layer and is located above the suction port 2 a of the sand pipe 2. The water guide cylinder 6 may be connected to the sandpipe 2 by a support member (not shown), or may be connected to a structure on the ground by a support member (not shown).

  FIG. 2 is an enlarged view of the water conduit 6 and the sand pipe 2 shown in FIG. As shown in FIG. 2, when sand is sucked in from the suction port 2a of the sand pipe 2, water existing on the sand accumulation layer is transferred from the upper end 6a of the water guide tube 6 into the water guide tube 6 as indicated by an arrow. To form a downward flow in the water guide cylinder 6. Such a downward flow of water lowers the density of sand around the suction port 2a, so that the sand raising pipe 2 sucks sand having a reduced density. Therefore, it is prevented that the sand raising pipe 2 is blocked with sand. Moreover, since sand with a low density is transferred through the sand pipe 2, excessive wear of the sand pipe 2 can be prevented. In this way, the water guide tube 6 constitutes a blockage prevention device for preventing the sandpipe 2 from being blocked.

  While the settling sand is being sucked in by the sandpipe pipe 2, the water guide cylinder 6 functions as a block wall for blocking the sand existing around the sandpipe pipe 2, and the suction port 2a of the sandpipe pipe 2 is buried in a large amount of sand. To prevent it. Accordingly, the sand around the suction port 2a is fluidized, and the sandpipe 2 can perform stable sanding.

  Next, the operation | movement which pulls up the sand deposited on the pond bottom of the sand basin 1 using a sand raising apparatus is demonstrated in detail. First, the vacuum device 12 is driven with the atmosphere release valve 15 closed. Thereby, the inside of the collection tank 10 and the sand pipe 2 is depressurized. Thereby, as shown in FIG. 3, the solid-liquid mixture which consists of sand and water is attracted | sucked in the sand sand pipe 2. As shown in FIG.

  When the upper end of the solid-liquid mixture in the sand raising pipe 2 rises above the connection part 16a of the atmosphere release pipe 16, the atmosphere release valve 15 is opened to release the connection part 16a to the atmosphere. As a result, as shown in FIG. 4, the solid-liquid mixture in the sand raising pipe 2 above the connection portion 16a of the atmosphere opening pipe 16 becomes a water column for transportation. The transport water column is transported to the collection tank 10 through the sandpipe 2 as it is.

  Immediately before the entire transport water column enters the recovery tank 10 so that the vacuum in the recovery tank 10 is maintained, that is, as shown in FIG. 5, the rear end of the transport water column enters the recovery tank 10. It is preferable that the controller 20 closes the air release valve 15 before the air release valve 15 is closed, so that no air communication path is formed in the path from the air release valve 15 to the recovery tank 10. Thereby, since the inflow amount of air from the atmosphere release valve 15 can be minimized, the pressure in the recovery tank 10 can be kept low, and the fluctuation range of the pressure can be kept small.

  When the air release valve 15 is closed again, as shown in FIG. 3, the water containing the sand settling in the sand settling basin 1 is sucked into the sand pumping pipe 2 as described above, and a solid-liquid mixture is formed again. Thereafter, by repeating the same process as described above, the sand deposited on the bottom of the sand basin 1 can be intermittently transported to the recovery tank 10.

  FIG. 6 is a view showing an embodiment of an occlusion prevention device further provided with an elevating device 25 for moving the water guide cylinder 6 up and down relatively with respect to the sandpipe 2. The lifting device 25 is disposed above the water surface of the sand basin 1, and the lifting device 25 can be operated from above the water surface. As the lifting device 25, a jack mechanism can be used, but is not limited thereto.

  A large amount of sand may flow into the sand settling basin 1 during heavy rains or typhoons, while the amount of sand settling decreases during periods of low rainfall. The vertical position of the water guide tube 6 is adjusted by the lifting device 25 in order to make the transported sand have an appropriate density. Specifically, when the amount of sand settling is large, the lower end 6b of the water guide tube 6 is positioned at the same height as the suction port 2a or below the suction port 2a in order to increase the water while reducing the amount of sand sucked in. . When the amount of sand settling is small, the lower end 6b of the water guide tube 6 is positioned above the suction port 2a in order to reduce the water while increasing the amount of sand to be sucked. In this way, the water guide tube 6 is raised and lowered based on the amount of sand settling in the sand settling basin 1.

  FIG. 7 is a view showing an embodiment of an occlusion prevention device provided with an air injection line 29 for stirring the sedimentation sediment deposited on the pond bottom. The air injection line 29 extends to the inside of the water conduit 6 and communicates with the inside of the sand pipe 2. More specifically, one end of the air injection line 29 is connected to the sandpipe 2 in the water guide cylinder 6, and the other end of the air injection line 29 is connected to an air injection valve 31 disposed above the water surface. It is connected. A compressed air supply source (for example, a compressor) (not shown) is connected to the air injection valve 31, and compressed air is supplied to the air injection line 29 when the air injection valve 31 is opened. The air injection valve 31 is connected to the control unit 20, and the opening / closing operation of the air injection valve 31 is controlled by the control unit 20.

  A main valve 35 is provided in the sand pipe 2. The main valve 35 is located above the connection point between the air injection line 29 and the sand raising pipe 2. When the air injection valve 31 is opened with the main valve 35 closed, the compressed air is injected into the sand raising pipe 2 through the air injection line 29, and the compressed air is released downward from the suction port 2a of the sand raising pipe 2. . This compressed air can break down (stir) the sand that has accumulated on the bottom of the pond and introduce the sand into the water guide tube 6. Therefore, the amount of sand existing in the water guide tube 6 can be adjusted by the amount of compressed air injected.

  FIG. 8 is a perspective view showing another configuration example of the water guide tube 6. As shown in FIG. 8, the water guide tube 6 is composed of two semi-cylindrical divided bodies 6A and 6B divided along the longitudinal direction (that is, the axial direction or the vertical direction). Support members 40 extending along the diameter direction of the water guide tube 6 are fixed to the divided bodies 6A and 6B, respectively. Each support member 40 has a curved portion 40 a having an inner surface along the outer surface of the sandpipe 2, and when these curved portions 40 a sandwich the sandpipe 2, the divided bodies 6 </ b> A and 6 </ b> B become sandpipe. 2 is attached.

  Brackets 42 are fixed to the upper and lower portions of the outer peripheral surfaces of the divided bodies 6A and 6B. These brackets 42 are arranged to face each other when the divided bodies 6A and 6B are combined. Each bracket 42 is formed with a through hole 42a into which a fastener such as a bolt is inserted. By fixing the brackets 42 facing each other with the fastener, the divided bodies 6A and 6B are fixed to each other, The divided bodies 6A and 6B can be fixed to the sand pipe 2 via the support member 40. These divided bodies 6 </ b> A and 6 </ b> B are fixed to each other in a state where the sandpipe 2 is disposed therebetween, and constitute a cylindrical water guide tube 6. According to such a configuration, the water guide cylinder 6 can be easily installed on the existing sand pipe 2.

  The preferred embodiments of the present invention have been described above, but the present invention is not limited to the above-described embodiments, and may be implemented in various forms within the scope of the technical idea.

DESCRIPTION OF SYMBOLS 1 Sedimentation basin 2 Sand pumping pipe 2a Suction port 6 Water guide pipe | tube 10 Collection tank 10a Sand discharge valve 15 Atmospheric release valve 16 Atmospheric release pipe 20 Control part 25 Elevator 29 Air injection line 31 Air injection valve 35 Main valve 40 Support member 42 Bracket

Claims (5)

A clogging prevention device for preventing clogging of a sand raising pipe that sucks up sand accumulated in a sand basin,
It is arranged so as to surround the sandpipe, and comprises a water conduit installed in the sand basin ,
The upper end of the water conduit is higher than the height of the sand deposition layer formed in the sand basin, and is located below the water surface of the sand basin,
The clogging prevention device according to claim 1, wherein a lower end of the water guide tube is located in the sand accumulation layer and is located above the suction port of the sandpipe .   The blockage prevention apparatus according to claim 1, further comprising an elevating device that moves the water guide tube up and down relatively with respect to the sandpipe.   The blockage preventing apparatus according to claim 1, further comprising an air injection line for injecting compressed air into the sandpipe and discharging the compressed air from a suction port of the sandpipe.   The blockage prevention device according to any one of claims 1 to 3, wherein the water guide tube includes a plurality of divided bodies divided along a longitudinal direction thereof. A sand pipe that sucks up the sand accumulated in the sand basin;
A collection tank for collecting the sand sucked up by the sand pipe,
A sand raising device comprising the blockage prevention device according to any one of claims 1 to 4.

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