JP5213438B2 - Dried sand transport device, transported sand transport method, and relay pot - Google Patents

Description

  The present invention relates to a sand transporting apparatus and a sand transporting method for transporting sand together with water, and in particular, sucking sand deposited on the bottom of a sand basin of a sewage treatment facility or human waste treatment facility together with water by vacuum suction, The present invention relates to a sand transporting device and a sand transporting method capable of efficiently transporting to a solid-liquid recovery tank installed higher than a sand basin, and a relay pot used for the sand transport.

  Sediment deposited in sedimentation basins such as sewage treatment facilities and human waste treatment facilities contains sediment, gravel, metal sediments, etc., and generates a strong odor. Therefore, the sand settling in the sand settling basin should be removed automatically, without problems such as clogging, high lift, long transport distance, energy saving, efficient and safe, that is, sand settling in the sand settling basin should be sanded and solidified. Development of technology for transporting to liquid recovery tanks, washing, and solid-liquid separation is required.

  For example, as a vacuum pumping facility for pumping the water in a sewage basin to a vacuum main pipe above the sewage basin, a relay tank is provided between the sewage basin and the vacuum main, and the sewage basin is generated by a negative pressure from the vacuum main. The water in the relay tank is pumped up, and the water in the relay tank is pumped up further to the vacuum main, which has been proposed to increase the water level step by step (patent) Reference 1). Moreover, when discharging mud through piping, it is known that the mud transport efficiency is improved by forming the mud in a plug shape and transporting in vacuum (for example, refer to Patent Document 2).

JP 2001-317118 A JP 2000-186495 A

  However, for example, in the same method as the invention described in Patent Document 1, when water that contains a lot of sand and compost, such as sedimentation collected at the bottom of a sedimentation basin, is to be pumped up to a high place, it accumulates in the relay tank. Due to the sand and commingled materials, the entrance of the outflow pipe of the relay tank is likely to be clogged, and in order to release this clogging, it is necessary to add a cleaning device with water or air. Therefore, it is considered that the device configuration and the control method are complicated.

  It is conceivable to form a transport plug (water column) with sand water obtained by suspending the sand in the sand basin in water and transport it in a vacuum (hereinafter referred to as “plug transport”). In this case, the process of transporting the settling water consists of a suction process that takes the accumulated settling sand into the transport pipe together with the water, and a transport process that forms a water column for transport using the settling sandwater and transports it to the destination. Water column transportation is carried out. In addition, if the sand sediment concentration in the transport plug is too high, the surface tension to maintain the plug shape during transportation cannot be obtained, so there is an upper limit on the initial sand sediment concentration of the transport plug. The sand concentration of the plug is up to about 20% by volume (hereinafter, the concentration of the sand is assumed to be volume% unless otherwise noted). However, the settling sand contained in the transport plug has a specific gravity of about 2.7, which is heavier than water, so the process of the transport plug going up in the direction of travel, especially in the vertical direction, at high speed. Therefore, under the influence of acceleration force and gravity, it gradually gathers at the rear end of the transport plug and the concentration exceeds 20%, and the length of the transport plug becomes shorter and the plug shape cannot be maintained. End up.

  When the settling of sand occurs from the transport plug and the length of the transport plug is attenuated and reaches a length where the plug shape cannot be maintained, the sand settling water is dispersed and becomes a floating flow state carried on the air flow. . Although it is possible to transport sedimentation even in a floating flow state, in order to carry sedimentation with heavy specific gravity, a larger air volume is required than when transporting while maintaining the plug shape of the transportation plug, which is necessary for transportation equipment. Power will become quite large.

  For this reason, plug transportation is effective for efficiently transporting the sand in the sand basin, and in order to efficiently transport the plug, a transport plug (water column) containing the appropriate concentration of sand is maintained up to the destination. It is important to continue, but there has never been such a means, and in actual operation, it is not possible to maintain the initial length of the transport plug (water column) to the transport destination, The present situation is that the plug for transportation is being transported while leaving.

  In addition, in the vertical piping section required for high-lift transportation, the sedimentation water that has collapsed in the vertical piping section and separated from the transportation plug is stopped from injecting air into the transportation pipe during the suction process after the transportation process. When the air flow is weakened, it drops to the bottom of the vertical pipe and greatly loses the potential energy, which is the biggest cause of lowering transport efficiency at high heads. This tendency becomes more prominent as the transport head becomes higher. For this reason, the substantial transport head is considered to be about 40 m.

  The present invention has been made in view of the above circumstances, and it is possible to transport sand settling in a sand basin more efficiently with small power even at a high head, and sand transport It is an object of the present invention to provide a method and a relay pot used for this sand transport.

The invention according to claim 1 is a transport pipe connecting a sand basin, a solid-liquid recovery tank that is installed at a higher position than the sand basin and collects the sand in the sand basin together with water, and the sand settling inside the transport pipe a plug forming portion for forming the shipping plug was suspended in water settling pond, a vacuum transport means for vacuum transporting along the transport plug in said transport pipe, is installed in the middle of the transportation pipeline, the It is a sand transporting device characterized in that it has a relay pot that is formed by a plug forming portion and is transported upward along the transport pipe to re-form the transport plug during transport.

  In this way, a relay pot is installed in the middle of the transportation pipe connecting the sand basin and the solid-liquid recovery tank installed at a higher position than the sand basin, and the transportation plug is transported by this transportation pot. By re-forming in the middle of the process, the sedimentation water separated from the plug for transportation during high-speed and accelerated transportation is stored in the relay pot, and the potential energy of the sanded sand is effectively used. In addition, while taking in the settling water in the relay pot, the transport plug in which the water and the settling sand are uniformly mixed can be re-formed in the relay pot, and the efficiency of subsequent plug transport can be increased.

The invention according to claim 2 is the sand transporting apparatus according to claim 1, wherein the relay pot is installed in the transport pipe every 10 to 30 meters.
Thereby, the loss of potential energy of the sand that has been sanded can be suppressed within 10 to 30 m, and the potential energy of the sand that has been sanded can be prevented from being greatly lost. It is preferable that the relay pot is installed in the transport pipe every 10 to 20 m in height in order to effectively suppress the loss of potential energy of the sanded sand.

According to a third aspect of the present invention, the volume of the relay pot is set to a volume obtained by multiplying the cross-sectional area of the transport pipe by a lifting height of 2 to 10 m. Sand transport device.
Each time the relay pot repeats the suction process and the transport process, the internal pressure changes to a vacuum pressure and an atmospheric pressure. If the capacity is too large, energy is wasted, and if it is too small, problems such as clogging due to sedimentation occur. . For this reason, the appropriate capacity of the relay pot is about the volume obtained by multiplying the cross-sectional area of the transport pipe by the lifting height of 2 to 10 m, and the appropriate capacity of the relay pot is determined by the length of the vertical pipe extending from the relay pot. Is desirable.

The invention according to claim 4 is characterized in that the plug forming part has an atmosphere release pipe connected to the transport pipe and an atmosphere release valve for opening and closing the atmosphere release pipe. A sand transporting device according to any one of the above.
As a result, the inside of the transportation pipe is evacuated to raise the sediment in the sedimentation basin together with the water to a predetermined position, and then the atmosphere opening / closing valve is opened and the inside of the transportation pipe is opened to the atmosphere through the atmosphere opening pipe. A transport plug can be formed therein.

The invention according to claim 5 is characterized in that the plug forming portion further includes an air supply pipe connected to the transport pipe and an air injection valve for injecting compressed air from the air supply pipe. It is a sand transporting apparatus of description.
As a result, the inside of the transportation pipe is evacuated to raise the sand in the sand basin together with the water to a predetermined position, and then the air injection valve is opened to push up the sand water above the connection with the air supply pipe of the transportation pipe. After that, the air injection valve is closed, the air opening / closing valve is opened, and the inside of the transportation pipe is opened to the atmosphere through the atmosphere opening pipe, so that the transportation plug can be formed in the transportation pipe.

  According to a sixth aspect of the present invention, the relay pot has a sedimentation reservoir portion for collecting sedimentation at the bottom, and the transportation plug is prepared by mixing the sedimentation in the sedimentation reservoir portion with a transport plug to be sent later. It is comprised so that it may re-form, The sand transport apparatus in any one of Claim 1 thru | or 5 characterized by the above-mentioned.

  In this way, by mixing the sand settling in the sand reservoir and the transport plug that will be sent later to re-form the transport plug, the sand settling in the relay pot will be removed from the sand that has been lost due to collapse during transport. The transportation plug in which water and sand are mixed at an appropriate concentration can be re-created by supplementing with the sand water in the section.

The invention according to claim 7 is a sand transportation method for transporting and recovering the sand in the sand basin with water through a transport pipe to a solid-liquid recovery tank installed higher than the sand basin, the grit inside the settling basin of the transportation pipeline to form a shipping plug was suspended in water, the shipping plug formed in the transportation pipeline, the transport piping passing in front Symbol solid-liquid recovery tank A sand transporting method characterized by transporting in a vacuum while re-forming during transporting upward .

  The invention according to claim 8 is characterized in that a relay pot is installed in the middle of the transport pipe, and the sand that has accumulated in the relay pot is mixed with the transport plug to re-form the transport plug. It is the sand transport method of Claim 7 to do.

The invention described in claim 9 has a pot body having a sealed structure in which an inflow pipe and an outflow pipe are connected, and the bottom of the pot body prevents air from flowing out naturally while ensuring air circulation. A settling portion for storing settling sand is formed, and a stirring plate that stirs the settling sand in the settling sand collection portion with the fluid by colliding the fluid flowing in from the inflow pipe and changing the direction of the inside of the pot body. The relay pot is arranged, wherein the sand settling in the sand settling portion is agitated with a fluid flowing in from the inflow pipe and is allowed to flow out from the outflow pipe together with the fluid.

  Thus, the sand settling back into the pot body through the outflow pipe can be reliably accumulated in the sand settling part, and the sand collected in the sand settling part can be discharged from the outflow pipe together with the fluid flowing into the pot body from the inflow pipe. it can.

A tenth aspect of the present invention is the relay pot according to the ninth aspect, wherein the sand settling part is located in the vicinity of the inlet of the outflow pipe.
Thereby, the sand settling in the sand settling part stirred by the fluid flowing in from the inflow pipe can be smoothly flowed into the outflow pipe from the inlet immediately after the stirring.

Inside the front Symbol pot body, said fluid flowing from the inflow pipe to collide with by changing its direction, by arranging the agitating plate for agitating the sand in the sand settling reservoir in fluid flows from the inlet pipe The diffusion effect of the sedimentation in the sedimentation reservoir by the fluid can be enhanced.

  According to the present invention, a relay pot is installed in the middle of a transport pipe connecting a sand basin and a solid-liquid recovery tank installed at a higher position than the sand basin, and the transport plug is connected to the transport plug by the relay pot. By re-forming in the middle of transportation, it is possible to transport the sand settling in the sand settling basin more efficiently with small power even at a high head.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 shows an outline of a sand transporting apparatus according to an embodiment of the present invention. The sand transporting device includes a solid-liquid recovery tank 12 having a sealed structure that is located at a higher position than the water level HWL of the sand settling basin 10 where sediment is deposited on the bottom of the pond, and is installed at the sand settling destination of the sand settling basin 10. The settling tank 12 is provided with the settling tank 12 to collect the settling sand in the settling basin 10 together with water. A vacuum pump 14 is connected to the solid-liquid recovery tank 12 as a vacuum transport means. In addition, the sedimentation sediment deposited on the bottom of the sedimentation basin 10 includes earth and sand such as pebbles and sand residue in addition to the sand.

The sand basin 10 and the solid-liquid recovery tank 12 are connected by a transport pipe 16 mainly composed of a vertical pipe. In this example, a first relay pot 18a, a second relay pot 18b, Three relay pots of the third relay pot 18c are installed. Thereby, the transport pipe 16 includes a first transport pipe 16a that connects the sand basin 10 and the first relay pot 18a, a second transport pipe 16b that connects the first relay pot 18a and the second relay pot 18b, and a second relay pot 18b. It is divided into four transport pipes, a third transport pipe 16c that connects the third relay pot 18c, and a fourth transport pipe 16d that connects the third relay pot 18c and the solid-liquid recovery tank 12. And between these each transport piping 16a-16d, the relay pots 18a-18c are arrange | positioned so that a part of transport piping 16 may be comprised. That is, by driving the vacuum pump 14 , the solid-liquid recovery tank 12, the first to fourth transport pipes 16a to 16d, and the first to third relay pots 18a to 18c are all decompressed (evacuated). It is configured to be.

  In this example, as described below, the loss of potential energy of the sand that has been sanded and accumulated in the relay pots 18a to 18c is suppressed to 10 to 30m, preferably within 10 to 20m. In order to prevent the potential energy from being largely lost, a relay pot is installed every time the heads H1 to H4 in the transport pipe 16 become 10 to 30 m, preferably 10 to 20 m.

  The first transport pipe 16a connecting the sand basin 10 and the first relay pot 18a includes an air release pipe 24 of a plug forming portion 22 that forms a transport plug (water column) 20 inside the first transport pipe 16a. The atmosphere opening pipe 24 is provided with an atmosphere opening valve 26 that opens and closes the atmosphere opening / closing valve 24.

  As a result, the inside of the first transport pipe 16a is evacuated via the vacuum pump 14, and the settling of the sand settling in the sand basin 10 to a predetermined position together with water, that is, the water level including the sand settling in the first transport pipe 16a is achieved. By pulling up until it becomes higher than the connection part with the atmosphere release pipe 24, then the atmosphere opening / closing valve 26 is opened, and the connection part with the atmosphere release pipe 24 of the first transport pipe 16a is opened to the atmosphere through the atmosphere release pipe 24. A transport plug (water column) 20 having a predetermined length in which the sand settling in the sand settling basin 10 is suspended in water can be formed above the connection portion with the atmosphere open pipe 24 in the transport pipe 16a. The transport plug 20 has, for example, a length of about 5 m and a sedimentation concentration of about 20%. The transport plug 20 formed in the first transport pipe 16a includes a first relay pot 18a, a second transport pipe 16b, a second relay pot 18b, a third transport pipe 16c, a third relay pot 18c, and a second relay pot 18c. 4 passes through the transport pipe 16d and is transported all at once to the solid-liquid recovery tank 12.

Furthermore, in this example, the plug forming portion 22 is provided with a compressor 28, and an air supply pipe 30 extending from the compressor 28 is located below the water level HWL of the sand basin 10 and connected to the first transport pipe 16a. Yes. An air injection valve 32 is installed in the air supply pipe 30. Before opening the air release valve 24, the compressor 28 is connected to the connection portion with the air supply pipe 30 located below the connection portion with the atmosphere release pipe 24 of the sand water drawn up inside the first transport pipe 16a. It is for injecting compressed air to push up the drawn sand water from below. Thus, the compressor 28 is provided, and after the compressed air is injected into the water inside the first transport pipe 16a, the atmosphere is released. By opening the valve, a long transportation plug 20 can be formed, and transportation efficiency can be increased.
The atmosphere release valve 26 and the air injection valve 32 are controlled by a control unit (not shown).

  2 and 3 show the first relay pot 18a. Since the second relay pot 18b and the third relay pot 18c have the same configuration as the first relay pot 18a, only the first relay pot 18a will be mainly described here.

  The first relay pot 18a is for feeding into the second transport pipe 16b while re-forming the transport plug 20 having a predetermined length formed inside the first transport pipe 16a. That is, the transport plug 20 transported along the second transport pipe 16b gradually collapses along with the transport, and the sand-settling water containing the sand settled from the transport plug 20 is applied to the peripheral wall of the second transport pipe 16b. It adheres and falls downward along the peripheral wall. As shown in FIG. 3, the first relay pot 18a accumulates the settling sand 34 of the settling water 36 including the settling sand 34 attached to the peripheral wall of the second transport pipe 16b and descending along the peripheral wall. The transporting plug is loaded with the settling sand 34 stored in the first relay pot 18a, and is sent to the second transporting pipe 16b while reforming the transporting plug in which water and the settling sand are mixed. Has been.

  Thus, the 1st relay pot 18a (thru | or 2nd, 3rd relay pot 18b, 18c) is installed in the middle of the transportation piping 16 which connects the sedimentation basin 10 and the solid-liquid collection | recovery tank 12, and this 1st relay pot 18a is installed. By re-forming the transportation plug 20 in the middle of transportation of the transportation plug 20 by the (to the second and third relay pots 18b, 18c), the sand sediment 34 separated from the transportation plug 20 in the middle of transportation is changed to the first. It is possible to effectively use the potential energy of the sand settling sand 34 accumulated in the one relay pot 18a (or the second and third relay pots 18b and 18c). Moreover, while taking in the sand settling 34 in the first relay pot 18a (to the second and third relay pots 18b, 18c), that is, the sand settling due to the collapse during the transportation, the first relay pot 18a (to the first relay pot 18a (to the second relay pot 18a). 2 and the third relay pot 18b, 18c) while supplementing with the sand settling 34, the plug 20 for transport in which water and the settling sand are mixed at an appropriate concentration can be reformed, and the efficiency of subsequent plug transport can be increased. .

  Here, the volume of the first relay pot 18a (or the second and third relay pots 18b, 18c) is set to a volume obtained by multiplying the cross-sectional area of the transport pipe 16 by a lifting height of 2 to 10 m. Each time the relay pot repeats the suction process and the transport process, the internal pressure changes to a vacuum pressure and an atmospheric pressure. If the capacity is too large, energy is wasted. Problems occur. For this reason, the appropriate capacity of the relay pot is about the volume obtained by multiplying the cross-sectional area of the transport pipe by the lifting height of 2 to 10 m, and the appropriate capacity of the relay pot is determined by the length of the vertical pipe extending from the relay pot. Is desirable.

  In this example, the first relay pot 18a has an inflow pipe 40 connected to the first transport pipe 16a extending in the horizontal direction at one end in the horizontal direction, and a second transport extending in the vertical direction in the vicinity of the other end in the horizontal direction. It has an outflow pipe 42 connected to the pipe 16 b and a pot body 44 having a sealed structure, and the inflow pipe 40 and the outflow pipe 42 are connected to the pot body 44. That is, the pot body 44 is formed in a substantially rectangular box shape sealed from the bottom plate 46, the pair of side plates 48, the pair of end plates 50 and the ceiling plate 52, and the inflow pipe 40 is connected to one end plate 50, An outflow pipe 42 is connected to the ceiling plate 52 at a position close to the end plate 50, whereby the horizontal flow is converted into a vertical flow by the first relay pot 18 a. .

  As shown in FIG. 3, the bottom plate 46 gradually inclines downward along the flow direction, and then rapidly inclines upward. As shown in FIG. The width gradually increases along the line, and after the width becomes constant, it gradually decreases. Accordingly, the pot body 44 is configured to gradually decrease after the cross-sectional area gradually increases along the flow direction, and flows from the lower end of the outlet 40a of the inflow pipe 40 to the bottom of the pot body 44. A sand settling part 54 is provided which gradually deepens along the direction, thereby preventing the natural settling of the sand settling 34 and collecting the sand settling 34. Here, as shown in FIG. 3, when the sand sediment water 36 including the sand sediment 34 is accumulated in the sand sediment reservoir 54, the inlet 42 a at the lower end of the outflow pipe 42 is positioned above the water surface of the sand sediment water 36. The air flow in the pot main body 44 is ensured. Further, in this example, the inlet 42 a at the lower end of the outflow pipe 42 is positioned substantially above the deepest part of the sand settling part 54.

  The transport plug 20 that has flowed into the pot main body 44 from the outlet 40a of the inflow pipe 40 hits the sand settling 34 accumulated in the sand settling portion 54 at a high speed of 3 to 15 m / sec, usually 6 to 7 m / sec. Stir in the water. In other words, the kinetic energy of the transport plug 20 is effectively used for the energy of stirring the sand settling 34 accumulated in the pot body 44 and used for re-forming the transport plug (water column) including the sand settling.

  Then, since the inlet 42a of the outflow pipe 42 is positioned substantially above the deepest part of the sand settling portion 54, the transport plug (water column) re-formed by stirring is immediately discharged from the inlet 42a to the outflow pipe 42. It smoothly flows in and is transported along the second transport pipe 16 b connected to the outflow pipe 42.

  In this example, the transport plug 20 that flows into the pot main body 44 from the inflow pipe 42 collides with the lower surface of the ceiling plate 52 and changes its direction, so that the transport plug 20 causes sand settling in the sand settling portion 54. A stir plate 56 that stirs 34 is gradually inclined downward along the flow direction. On both side portions of the stirring plate 56, air circulation portions 58 for ensuring air circulation are provided. Thereby, the stirring effect of the sand settling portion 34 in the sand settling portion 54 by the transport plug 20 can be enhanced, and the sand settling 34 in the sand settling portion 54 can be taken into the transport plug to be re-formed, particularly at the front end portion.

  Thus, the transport plug 20 that has flowed into the first relay pot 18a has a residence time of about 0.5 to 2 seconds in the first relay pot 18a, and the relay pot 18a And then transported along the second transport pipe 18b. And when the sedimentation water which fell on the wall surface of the 2nd transportation piping 16b fell by the suction process after a transportation process, the sedimentation of this sedimentation water is stored without raise | generating a blockage | blocking inside the 1st relay pot 18a. In addition, although a certain amount of the settling water returning from the second transport pipe 18b is accumulated in the first relay pot 18a, before the water level completely closes the inlet of the outflow pipe 42 of the first relay pot 18a, The first relay pot 18a flows out downward from the inflow pipe of the one relay pot 18a, whereby the first relay pot 18a does not hinder the transmission of suction and transport pressure in the process.

Next, a sand lifting operation for lifting the sand settling in the sand settling basin 10 using this sand lifting device will be described.
First, the vacuum pump 12 and the compressor 28 are activated to start operation with the atmosphere release valve 26 and the air injection valve 32 closed. Thereby, the inside of the solid-liquid collection | recovery tank 12, the 1st-4th transport piping 16a-16d, and the 1st-3rd relay pots 18a-18c to which the vacuum pump 12 was connected is predetermined | prescribed vacuum degree, for example, -49. The pressure is reduced to 0 kPa (−5 mAq), and the water containing the settling sand in the settling basin 10 is sucked into the first transport pipe 16 a as a solid-liquid mixture.

  When the water level of the solid-liquid mixture in the first transport pipe 16a rises above the connection portion of the atmosphere release pipe 24, the air injection valve 32 is opened to push up the water column, and then the air injection valve 32 is The air release valve 26 is closed and the connection portion of the first transport pipe 16a with the air release pipe 26 is opened to the atmosphere. By opening the atmosphere release valve 26 in this way, as shown in FIG. 1, the solid-liquid mixture of the first transport pipe 16a located above the connection portion of the atmosphere release pipe 24 has a predetermined length. This is a transport plug (water column) 20. Then, the plug is transported.

  As described above, when the plug is transported, the transport plug 20 flows along the first transport pipe 16a and flows into the first relay pot 18a while losing its shape. The transportation plug 20 that has flowed into the first relay pot 18a is temporarily broken into a plug shape, and then fed into the second transportation pipe 16b while re-forming the transportation plug, and into the second transportation pipe 16b while breaking the plug. Flowing along. Similarly, the transport plug 20 is transported to the fixed recovery tank 12 at a stretch while being reformed by the second relay pot 18b and the third relay pot 18c. In this example, the transport flow rate in the suction transport pipe 16 of the transport plug 20 is, for example, 3 to 15 m / second, usually 6 to 7 m / second. Then, after the transportation is finished, the atmosphere release valve 26 is closed.

  When the air release valve 26 is closed, the inflow of air into the first transport pipe 16a stops, and as a result, the flow of air in the first to fourth transport pipes 16a to 16d is weakened. For this reason, most of the sandwater that has adhered to the peripheral wall of the second transport pipe 16b is in the first relay pot 18a, and most of the sandwater that has adhered to the peripheral wall of the third transport pipe 16c is the second relay. In the pot 18b, most of the sandwater adhering to the peripheral wall of the fourth transport pipe 16d falls to the third relay pot 18c by gravity. Then, the sand settling in the first relay pot 18a, the second relay pot 18b, and the third relay pot 18c is taken into the transport plug when the transport plug passes next.

  In this way, the relay pots 18a to 18c are installed in the middle of the transport pipe 16 that connects the sand basin 10 and the solid-liquid recovery tank 12 installed higher than the sand basin 10, and the relay pots 18a to 18c are used. By re-forming the transportation plug 20 in the middle of transportation of the transportation plug 20, the sand sediment separated from the transportation plug 20 during the transportation is accumulated in the relay pots 18 a to 18 c, and The potential energy possessed can be used effectively. Moreover, by mixing the sand settling 34 in the sand settling portion 54 of the relay pots 18a to 18c with the transport plug 20 sent later to re-form the transport plug, there was a lack of collapse due to transport. The transporting plug in which water and the settling sand are mixed can be reformed by supplementing the settling sand with the settling sand 34 in the settling sand reservoir 54 of the relay pots 18a to 18c.

4 to 6 show other examples of the first relay pot 18. The relay pot 18 in this example is configured to transport the flow of the transport plug (water column) along the vertical direction in the vertical direction without changing the direction thereof, and extends in the vertical direction. For example, FIG. An inflow pipe 60 connected to the upper end of the first transport pipe 16a shown in FIG. 1, an outflow pipe 62 extending in the vertical direction, for example, connected to the lower end of the second transport pipe 16b shown in FIG. The pot body 64 is connected to the upper end of the inflow pipe 60 and the lower end of the outflow pipe 62.

  The pot body 64 has a pair of circular side plates 66 and 68, and the pair of side plates 66 and 68 are arranged facing each other so that the end portions along the horizontal direction are close to each other while being spaced apart by a predetermined distance. In addition, a tapered portion 66a inclined inward is provided in the lower half of one side plate 66, and the openings around both side plates 66 and 68 are hermetically covered with a single substantially cylindrical end plate 70. ing. An inflow pipe 60 is attached to the tapered portion 66a of one side plate 66 so as to extend substantially in the tangential direction of the side plate 66, and further, the inflow pipe 60 is located at a position close to the other side plate 68 of the end plate 68. The outflow pipe 62 is attached so as to extend substantially linearly. The inflow pipe 60 and the outflow pipe 62 are connected to the wide side of the side plates 66 and 68 arranged to face each other.

As a result, when the transport plug (water column) flows from the inflow pipe 60 into the pot body 64, a vertical spiral flow along the end plate 70 is formed inside the pot body 64, and this spiral flow is formed on the side plate. 66 moves laterally along the taper portion 66 a toward the outflow pipe 62 and smoothly flows into the inflow pipe 62. As a result, energy conversion is performed in the same manner as in the above-described another type of relay pot, so that the sand sediment 34 accumulated in the following sand sediment reservoir 74 can be reliably agitated, and the loss of potential energy can be further reduced.

In addition, by extending the outlet 60a of the inflow pipe 60 to a predetermined position in the pot body 64, the sand sinking the bottom of the pot body 64 to prevent the natural settling of the settling water including the settling sand and storing the settling sand. A reservoir 74 is provided. Then, as shown in FIG. 6, when the sand sediment water 36 including the sand sediment 34 is accumulated in the sand sediment reservoir 74 , the inlet 62 a at the lower end of the outflow pipe 62 is positioned above the water surface of the sand sediment water 36. The air flow in the main body 64 is ensured.

  Thus, energy loss due to the provision of the relay pot can be reduced by transporting the flow of the transport plug (water column) along the vertical direction in the vertical direction without changing the direction thereof.

  The preferred embodiments of the present invention have been described above, but the present invention is not limited to the above-described embodiments, and it goes without saying that the present invention may be implemented in various forms within the scope of the technical idea.

It is a schematic diagram which shows the sand transporting apparatus of embodiment of this invention. It is a top view which expands and shows the relay pot of the sand transporting apparatus shown in FIG. It is a front view which expands and shows the relay pot of the sand transporting apparatus shown in FIG. It is a top view which shows another relay pot. FIG. 5 is a front view of FIG. 4. FIG. 6 is a right side view of FIG. 5.

Explanation of symbols

10 Sedimentation basin 12 Solid-liquid recovery tank 14 Vacuum pump (Vacuum transporting means)
16, 16a to 16d Transport pipe 18, 18a to 18c Relay pot 20 Transport plug 22 Plug forming portion 24 Atmospheric release pipe 26 Atmospheric release valve 28 Compressor 30 Air supply pipe 32 Air injection valve 34 Sand settling 36 Sand settling water 40, 60 Inflow pipe 40a, 60a Outlet 42, 62 Outflow pipe 42a, 62a Inlet 44, 64 Pot body 46 Bottom plate 48, 66, 68 Side plate 50, 70 End plate 52 Ceiling plate 54, 74 Sand sediment reservoir 56 Stir plate

Claims (10)

A transport pipe that connects a sand basin and a solid-liquid recovery tank that is installed at a higher position than the sand basin and collects the sand in the sand basin together with water;
A plug forming portion for forming a transport plug in which the sand settling in the sand settling basin is suspended in water inside the transport pipe;
Vacuum transport means for vacuum transporting the transport plug along the transport pipe;
A lifting pot is provided in the middle of the transportation pipe, and has a relay pot for re-forming the transportation plug formed in the plug forming portion and transported upward along the transportation pipe in the middle of transportation. Sand transport equipment.   The said relay pot is installed in the said transport piping for every 10-30 meters of heads, The sand transporting apparatus of Claim 1 characterized by the above-mentioned.   3. The sand transporting apparatus according to claim 1, wherein a volume of the relay pot is set to a volume obtained by multiplying a cross-sectional area of the transport pipe by a lifting height of 2 to 10 m.   4. The sand transporting apparatus according to claim 1, wherein the plug forming unit includes an atmosphere opening pipe connected to the transportation pipe and an atmosphere opening valve that opens and closes the atmosphere opening pipe. 5. .   The said plug formation part further has an air injection valve which injects compressed air from the air supply pipe connected to the said transport piping, and this air supply pipe, The sand transporting apparatus of Claim 4 characterized by the above-mentioned.   The relay pot has a sand settling part that accumulates sand at the bottom, and is configured to re-form the transport plug by mixing the sand settling in the sand settling part and a transport plug that is sent later. The sand transporting device according to any one of claims 1 to 5. A sand transport method that transports and collects the sand in the sand basin with water through a transport pipe to a solid-liquid recovery tank installed at a higher location than the sand basin,
Forming a transport plug in which the sand settling basin is suspended in water inside the transport pipe,
Agesuna transport, characterized in that the transporting said transport plug formed in the pipe, vacuum transport while reformed in the course of transport upwardly toward the transportation pipeline in passing pre Symbol solid-liquid recovery tank Method.   8. The sand transportation according to claim 7, wherein a relay pot is installed in the middle of the transport pipe, and the sand that has accumulated in the relay pot is mixed with the transport plug to re-form the transport plug. Method. It has a pot body with a sealed structure in which an inflow pipe and an outflow pipe are connected, and a sand settling part is formed at the bottom of the pot body to prevent the natural settling of sand and prevent sedimentation while accumulating air. In the pot body, a stirring plate is disposed in which the fluid flowing in from the inflow pipe collides and changes its direction so as to stir the sand settling in the sand settling portion with the fluid, and the sand settling in the sand settling portion. The relay pot is characterized in that the fluid is agitated with the fluid flowing in from the inflow pipe and is discharged from the outflow pipe together with the fluid.   The relay pot according to claim 9, wherein the sand settling part is located in the vicinity of an inlet of the outflow pipe.

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