JP7460454B2 - Sediment Removal Method - Google Patents

Description

The present invention relates to a method for removing sediments from stagnant water, and in particular to a method for partially removing sediments from specific locations when sediments have accumulated in stagnant water within a structure.

One example of sediment in retained water that needs to be removed is sediment that has accumulated in a settling basin of a water treatment facility. The sediment that has accumulated in the settling basin is lifted using a bucket-type sediment scraper or a pump-type suction and lifting device.

Bucket-type sediment scraping devices scrape up and discharge sediment that has accumulated across the entire bottom of a settling basin, eliminating the need to accumulate the sediment to be removed in one place. However, the device configuration is large and complex, making it difficult to use in cramped environments and cumbersome to maintain.

Pump-type suction and lifting sand devices have a simple device configuration and can be easily miniaturized. However, because they can only suck up the sediment close to the pump suction port, the sediment to be removed must be accumulated in one place. For this reason, pump-type suction and lifting sand devices form a sedimentation pit in the sedimentation basin, accumulate the sediment that has accumulated across the entire bottom of the sedimentation basin in the sedimentation pit, and then suck up and remove it using a fixed pump.

JP 8-229310 A (Patent Document 1) is an example of background technology for such conventional technology. Patent Document 1 describes a sand collection device for a settling basin in which the bottom surface of the settling basin is formed to slope downward from the upstream side to the downstream side, a settling pit is formed at the downstream end, and a pump well for retaining supernatant water is formed adjacent to the settling pit, and the device has a sediment gathering nozzle that sprays pressurized water in the direction of the raw water flow at the upstream end of the settling basin, multiple sediment lifting nozzles that are formed at predetermined intervals in the midstream part of the settling basin in the direction of the raw water flow and spray pressurized water downward, and a jet pump type sand lifting device that lifts up the sediment accumulated in the settling pit (see abstract).

Japanese Patent Application Publication No. 8-229310

The sand collecting device for a settling basin described in Patent Document 1 has a bottom surface of the settling basin sloped downward from the upstream side to the downstream side, and accumulates earth and sand deposited in the settling pit.

However, Patent Document 1 does not describe a sediment removal method for partially removing sediments at specific locations when sediments are accumulated in retained water in a building.

Therefore, the present invention is applicable to cases where sediment has accumulated in stagnant water in a building, and the upper part of the stagnant water is covered with a structure (floor or grating) to prevent toxic gas etc. from being generated within the building. To provide a deposit removal method for partially removing deposits at a specific location using a simple device even if there is a possibility that the deposits are

In order to solve the above-mentioned problems, the method for removing sediments of the present invention is for a case where sediments have accumulated in stagnant water within a building, and the upper part of the stagnant water is covered by a structure, and the method partially removes the sediments at a specific location, by drilling a specific location of the structure above the stagnant water to form a drilled section in the structure, dropping a sand pump from the drilled section into the stagnant water into the stagnant water, installing one compressed air tube that sprays compressed air and multiple high-pressure water tubes that spray high-pressure water in the stagnant water so that the multiple high-pressure water tubes surround the one compressed air tube in a semicircular shape, making the inner diameter of the multiple high-pressure water tubes smaller than the inner diameter of the one compressed air tube, and having tips of the multiple high-pressure water tubes The system is characterized in that it is bent in an L shape with its outlets facing the same direction, the outlets of the multiple high-pressure water tubes are installed lower than the outlet of one of the compressed air tubes, the high-pressure water sprayed from the multiple high-pressure water tubes is directed horizontally, and the compressed air sprayed from one of the compressed air tubes is directed vertically, compressed air is sprayed from the compressed air tube onto the surface of the sediment, lifting up crushed pieces of the sediment into the stagnant water, high-pressure water is sprayed from the high-pressure water tube to push the crushed pieces of the sediment in the direction of the sand pump, the stagnant water and sediment are sucked in as suspended water by the sand pump , the suspended water is transported, and at the destination the suspended water is separated into stagnant water and sediment and the sediment is removed.

According to the present invention, when sediment is deposited in stagnant water inside a building, the upper part of the stagnant water is covered with a structure (floor or grating), and toxic gas etc. are generated inside the building. Even if there is a possibility that the deposits are removed, it is possible to provide a deposit removal method that partially removes the deposits at a specific location using a simple device.

Note that issues, configurations and effects other than those mentioned above will become clearer in the explanation of the examples below.

FIG. 2 is an explanatory diagram illustrating a method of drilling a floor 4 described in Example 1. FIG. 2 is an explanatory diagram for explaining a method for removing the deposit 3 described in Example 1. 7 is an explanatory diagram illustrating a method for removing deposits 3 in a wider area than the perforation portion 7 using a sand pump 28 having a thruster described in Example 2. FIG. FIG. 11 is an explanatory diagram illustrating a method for removing deposits 3 from an area wider than the drilling section 7 using a sand pump 29 having a crawler as described in the third embodiment. An explanatory diagram illustrating a method of drilling the grating 44 described in Example 4. FIG. 7 is an explanatory diagram illustrating a method for removing deposits 43 described in Example 4. 7 is an explanatory diagram illustrating a method of perforating a grating 44 described in Example 5. FIG. FIG. 7 is an explanatory diagram illustrating a method for removing deposits 43 described in Example 5. 9 is an explanatory diagram illustrating the arrangement of a compressed air tube 94 and a high pressure water tube 95 described in Example 5. FIG.

Embodiments of the present invention will be described below with reference to the drawings. Note that substantially the same or similar configurations are given the same reference numerals, and if the description is repeated, the description may be omitted.

In this embodiment, a sand pump that sucks up sediments is dropped into the stagnant water. The sand pump then rotates an impeller installed at the bottom of the sand pump, suspending the stagnant water and sediments, and sucks them up as suspended water.

In other words, in this embodiment, the sand pump is used in stagnant water. For this reason, it is necessary to form a perforation in the structure above the stagnant water (a floor made of a floor or grating) that allows at least the sand pump to pass through.

On the other hand, the method for removing deposits described in this example can efficiently suction deposits that have a higher specific gravity than the accumulated water.

First, we will explain a method for partially removing sediment from a specific location when sediment has accumulated in stagnant water inside a structure, the top of the stagnant water is covered by a structure (floor), and there is a possibility that toxic gases or the like are being generated inside the structure.

Figure 1A is an explanatory diagram illustrating the method of drilling holes in the floor 4 described in Example 1.

In Example 1, retained water 2 and deposits 3 are collected at the bottom of the building 1. If the upper part of the accumulated water 2 is covered with the floor 4, this is the case where the deposit 3 is to be removed.

First, an anteroom 6 is installed outside the opening 5 of the structure 1. This prevents the gas inside the structure 1 from leaking directly into the outside air.

A self-propelled drilling device 11 enters through the opening 5 and runs on the floor 4.

The drilling device 11 has the function of drilling holes in the floor 4 using an abrasive water jet that sprays abrasives (polishing material) along with high-pressure water.

The front room 6 is equipped with a controller 12, an abrasive supply device 13, a water tank 14, and a high-pressure pump 15, and only the drilling device 11 enters the structure 1.

When the drilling device 11 controlled by the controller 12 reaches the top of the area where the deposit 3 is to be removed, high-pressure water containing abrasives is sprayed from the abrasive supply device 13 and water tank 14 to drill holes in the floor 4. In other words, the drilled portion 7 is formed by drilling using water jet cutting.

When drilling into the floor 4 is completed, the drilling device 11 is driven and recovered from the opening 5.

Figure 1B is an explanatory diagram illustrating the method for removing deposit 3 described in Example 1.

A self-propelled deposit removing device 21 enters through the opening 5 and runs on the floor 4.

The front chamber 6 is equipped with a controller 23, a separator 27, a sediment collection container 24, a supernatant water transfer pump 26, and a supernatant water collection tank 25, and only the sediment removal device 21 enters the structure 1.

The sand pump 22 is mounted on the sediment removal device 21.

When the sediment removal device 21 , which is controlled by the controller 23 , reaches the perforation 7 , the sand pump 22 is dropped from the perforation 7 into the retained water 2 .

The sand pump 22 rotates an impeller installed at the bottom of the sand pump 22, suspends the accumulated water 2 and the deposits 3, and sucks the suspended water. The sucked suspended water is separated into solid (sediment 3) and liquid (supernatant water) by the separator 27, the solid (sediment 3) is transferred to the sediment collection container 24, and the liquid (supernatant water) is transferred to the supernatant water. The supernatant water is transferred to the supernatant water recovery tank 25 via the water transfer pump 26.

When the suspended water is sucked up by the sand pump 22, it is checked whether the amount of solid components collected in the sediment collection container 24 has increased, and it is confirmed that the sediment 3 has been removed.

That is, the accumulated water 2 and the sediment 3 are sucked in as suspended water, the suspended water is transferred, and the suspended water is separated into the accumulated water 2 and the sediment 3 at the transfer destination. Then, as the suspended water is sucked, it is confirmed that the amount of separated sediment 3 increases.

When the predetermined amount of deposits 3 has been removed, the sand pump 22 is pulled up and stored in the deposit removal device 21. Then, the deposit removing device 21 is made to run and is collected from the opening 5.

As a result, even if deposits 3 have accumulated in the stagnant water 2 inside the structure 1, and the top of the stagnant water 2 is covered with a floor 4, and there is a possibility that toxic gases or the like are being generated inside the structure 1, it is possible to partially remove the deposits 3 from a specific location using a simple device. And even if there is any deposits 3 that are in the way, it is possible to move them to another location within the structure 1 and partially remove the deposits 3 from the specific location.

Next, a method for removing deposits 3 in a wider area than the perforation 7 using the sand pump 28 having the thruster described in Example 2 will be described.

FIG. 2 is an explanatory diagram illustrating a method for removing deposits 3 in a wider area than the perforation 7 using the sand pump 28 having a thruster described in the second embodiment.

The sediment removal method described in Example 2 is different from the sediment removal method described in Example 1 in that a sand pump 28 having a thruster (propeller) is used to suck suspended water.

The sand pump 22 can only suck up the deposits 3 below the sand pump 22, but by dropping a sand pump 28 with a thruster as shown in Figure 2, the sand pump 28 can be scanned horizontally in the stagnant water 2, and a wider range of deposits 3 can be removed horizontally than the drilling section 7.

In other words, the sand pump 28 has a mechanism for moving horizontally in the stagnant water 2, and moves horizontally in the stagnant water 2 to suck up the sediments 3 and remove them.

As a result, if sediment 3 has accumulated in the accumulated water 2 in the building 1, the upper part of the accumulated water 2 is covered with the floor 4, and toxic gas etc. are generated in the structure 1. Even if there is a possibility that the deposits 3 are present, it is possible to partially remove the deposits 3 at a specific location over a wider range using a simple device.

Next, a method for removing deposits 3 from a wider area than the perforation 7 using the sand pump 29 having a crawler described in Example 3 will be described.

Figure 3 is an explanatory diagram illustrating a method for removing deposits 3 from an area wider than the drilling section 7 using a sand pump 29 having a crawler as described in Example 3.

The sediment removal method described in Example 3 is different from the sediment removal method described in Example 1 in that a sand pump 29 having crawlers (caterpillars) is used to suck suspended water.

Note that the sand pump 22 can only suck the sediment 3 below the sand pump 22, but by dropping the sand pump 29 having a crawler as shown in FIG. By scanning in the horizontal direction, it is possible to remove deposits 3 in a wider range in the horizontal direction than in the perforation section 7.

That is, the sand pump 29 has a mechanism that moves horizontally in the accumulated water 2, moves in the horizontal direction in the accumulated water 2, suctions the deposits 3, and removes the deposits 3.

As a result, if sediment 3 has accumulated in the accumulated water 2 in the building 1, the upper part of the accumulated water 2 is covered with the floor 4, and toxic gas etc. are generated in the structure 1. Even if there is a possibility that the deposits 3 are present, it is possible to partially remove the deposits 3 at a specific location over a wider range using a simple device.

Next, there is a possibility that sediment has accumulated in the stagnant water inside the building, and the upper part of the stagnant water is covered by a structure (grating), causing toxic gas etc. to be generated inside the building. A deposit removal method for partially removing deposits at a specific location will be described below.

FIG. 4A is an explanatory diagram illustrating a method of perforating the grating 44 described in Example 4.

In the fourth embodiment, retained water 42 and deposits 43 are collected at the bottom of a building 41. If the upper part of the accumulated water 42 is covered with the grating 44, this is a case where the deposit 43 is removed.

First, the front chamber 46 is installed outside the opening 45 of the building 41. To prevent gas inside a building 41 from directly leaking to the outside air.

A self-propelled drilling device 51 enters through the opening 45 and runs on the grating 44.

The drilling device 51 has a function of drilling holes in the grating 44 by electrical discharge machining.

The controller 52 and the electric discharge machining power supply 53 are installed in the antechamber 46, and only the drilling device 51 enters the structure 41.

When the drilling device 51, controlled by the controller 52, reaches the top of the area where the deposit 43 is to be removed, power is supplied from the electric discharge machining power supply 53 to drill holes in the grating 44. In other words, the drilled portion 47 is formed by drilling holes using electric discharge machining.

Once drilling into the grating 44 is complete, the drilling device 51 is run and retrieved from the opening 45.

Figure 4B is an explanatory diagram illustrating the method for removing deposit 43 described in Example 4.

A self-propelled deposit removal device 61 is inserted through the opening 45 and driven over the grating 44.

A controller 63 is installed in the antechamber 46, and only the deposit removal device 61 enters the structure 41.

The sand pump 62 is mounted on the sediment removal device 61. In addition, a metal mesh sediment storage container 65 is installed on top of the grating 44.

When the sediment removal device 61 , which is controlled by the controller 63 , reaches the perforation 47 , the sand pump 62 is dropped from the perforation 47 into the retained water 42 .

The sand pump 62 rotates an impeller installed at the bottom of the sand pump 62, suspends the accumulated water 42 and the deposits 43, and sucks the suspended water as suspended water. The sucked suspended water is discharged into the sediment storage container 65. Since the sediment storage container 65 is made of metal mesh, the sediment 43 remains in the sediment storage container 65, and the accumulated water 42 flows through the mesh and grating 44 of the sediment storage container 65 and falls. , returns to the retained water 42.

When the sand pump 62 sucks the suspended water, it is investigated whether the solid components collected in the sediment storage container 65 are increasing, and it is confirmed that the sediment 43 has been removed.

That is, the accumulated water 42 and the sediment 43 are sucked as suspended water, the suspended water is transferred, and the suspended water is separated into the accumulated water 42 and the sediment 43 at the transfer destination (sediment storage container 65). Then, as the suspended water is sucked, it is confirmed that the amount of separated sediment 43 increases.

When the predetermined amount of deposits 43 has been removed, the sand pump 62 is pulled up and stored in the deposit removal device 61. Then, the deposit removing device 61 is caused to travel and is collected from the opening 45.

As a result, if sediment 43 is deposited in the accumulated water 42 inside the building 41, the upper part of the accumulated water 42 is covered with the grating 44, and toxic gas etc. are generated inside the building 41. Even if there is a possibility that the deposits 43 are present, it is possible to partially remove the deposits 43 at a specific location using a simple device. Even if there is an obstructive deposit 43, it is possible to move to another location within the building 41 and partially remove the deposit 43 at a specific location.

Note that in the fourth embodiment, as in the second or third embodiment, a thruster or a crawler is installed in the sand pump 62, and the deposits 43 at a specific location can be partially removed over a wider range. .

Next, we will explain a method for partially removing sediment from a specific location when sediment has accumulated in the stagnant water inside a structure, the top of the stagnant water is covered by a structure (grating), and there is a possibility that toxic gases or the like are being generated inside the structure.

FIG. 5A is an explanatory diagram illustrating a method of perforating the grating 44 described in Example 5.

In the fifth embodiment, retained water 42 and deposits 43 are collected at the bottom of a building 41. When the upper part of the retained water 42 is covered with a grating 44 having a grid-like gap of 70 mm x 20 mm, this is a case in which the deposit 43 is removed in a wider area in the horizontal direction than the perforated part 47.

First, a front chamber 46 (not shown) is installed outside the opening 45 of the building 41. To prevent gas inside a building 41 from directly leaking to the outside air.

A self-propelled drilling device 51 enters through the opening 45 and runs on the grating 44.

The drilling device 51 has the function of drilling holes in the grating 44 using electric discharge machining.

A controller 52 (not shown) and an electric discharge machining power supply 53 (not shown) are installed in the antechamber 46, and only the drilling device 51 enters the structure 41.

When the drilling device 51, controlled by the controller 52, reaches the top of the area where the deposit 43 is to be removed, power is supplied from the electric discharge machining power supply 53 to drill holes in the grating 44. In other words, the drilled portion 47 is formed by drilling holes using electric discharge machining.

Once drilling into the grating 44 is complete, the drilling device 51 is run and retrieved from the opening 45.

Figure 5B is an explanatory diagram illustrating the method for removing deposit 43 described in Example 5.

In particular, in Example 5, a method will be described in which the deposits 43 are removed in a wider area in the horizontal direction than the perforated portion 47 using compressed air and high-pressure water.

A self-propelled deposit removing device 61 enters through the opening 45 and runs over the grating 44 .

A controller 63 (not shown) is installed in the front chamber 46, and only the deposit removal device 61 enters the building 41.

The sand pump 62 is mounted on the sediment removal device 61. In addition, a metal mesh sediment storage container 65 (not shown) is installed on top of the grating 44.

When the sediment removal device 61, controlled by the controller 63, reaches the drilling section 47, the sand pump 62 is dropped from the drilling section 47 into the stagnant water 42.

Further, a self-propelled deposit blowing device 93 is advanced through the opening 45 and is driven to the vicinity of the deposit removing device 61 . Then, a compressed air tube 94 and a high-pressure water tube 95 having an outer diameter that can pass through the gap between the gratings 44 are installed in the accumulated water 42 from the sediment blowing device 93 .

The compressed air supplied to the compressed air tube 94 and the high-pressure water supplied to the high-pressure water tube 95 are supplied from the front chamber 46.

Compressed air is sprayed from the compressed air tube 94 onto the surface of the deposits 43, lifting the crushed pieces of the deposits 43 into the stagnant water 42. High-pressure water is then sprayed from the high-pressure water tube 95, generating a water current in the stagnant water 42 and sweeping the crushed pieces of the deposits 43 in the direction of the sand pump 62. This allows the sand pump 62 to suck up deposits 43 that are located far away from the sand pump 62.

The sand pump 62 rotates an impeller installed at the bottom of the sand pump 62, suspending the stagnant water 42 and sediments 43 and sucking them up as suspended water. The sucked suspended water is discharged into the sediment storage container 65. Because the sediment storage container 65 is made of metal mesh, the sediments 43 remain in the sediment storage container 65, and the stagnant water 42 flows through the mesh and grating 44 of the sediment storage container 65, falls, and returns to the stagnant water 42.

When the sand pump 62 sucks the suspended water, it is investigated whether the solid components collected in the sediment storage container 65 are increasing, and it is confirmed that the sediment 43 has been removed.

In other words, the stagnant water 42 and sediment 43 are sucked in as suspended water, the suspended water is transferred, and the suspended water is separated into the stagnant water 42 and sediment 43 at the destination (sediment storage container 65). It is then confirmed that the amount of separated sediment 43 increases as the suspended water is sucked in.

When the predetermined amount of deposits 43 has been removed, the sand pump 62 is pulled up and stored in the deposit removal device 61. Then, the deposit removing device 61 is caused to travel and is collected from the opening 45.

The method of removing sediments described in Example 5 is for cases where sediments 43 have accumulated in stagnant water 42 within a structure 41 and the upper part of the stagnant water 43 is covered with grating 44, and involves partially removing the sediments 43 at specific locations by drilling a specific location of the grating 44 above the stagnant water 42 to form a drilled section 47 in the grating 44, dropping a sand pump 62 into the stagnant water 42 from the drilled section 47, sucking up the sediments 43, and removing the sediments 43.

The method for removing deposits described in Example 5 is as follows:
(1) In a case where sediments 43 have accumulated in stagnant water 42 in a structure 41, and the upper part of the stagnant water 43 is covered with a grating 44, the sediments 43 at a specific location are partially removed,
(2) First, a self-propelled drilling device 51 is inserted into the grating 44 above the stagnant water 42 through a small opening 45 in the structure 41, and a specific portion of the grating 44 is drilled to form a drilled portion 47 in the grating 44.
(3) Next, a self-propelled sediment removal device 61 is inserted into the grating 44 above the stagnant water 42 through the small opening 45 in the structure 41, and a sand pump 62 is dropped into the stagnant water 42 through the drilling section 47 to suck up the sediment 43 and remove it.

Furthermore, the method of removing deposits described in Example 5 includes installing a compressed air tube 94 for injecting compressed air and a high-pressure water tube 95 for injecting high-pressure water, injecting compressed air from the compressed air tube 94 onto the surface of the deposits 43, lifting up the fragments of the deposits 43 into the stagnant water 42, and injecting high-pressure water from the high-pressure water tube 95 to generate a water current in the stagnant water 42, and sweeping the fragments of the deposits 43 in the direction of the sand pump 62.

As a result, if sediment 43 is deposited in the accumulated water 42 inside the building 41, the upper part of the accumulated water 42 is covered with the grating 44, and toxic gas etc. are generated inside the building 41. Even if there is a possibility that the deposits 43 are present, it is possible to partially remove the deposits 43 at a specific location using a simple device. Even if there is an obstructive deposit 43, it is possible to move to another location within the building 41 and partially remove the deposit 43 at a specific location.

Furthermore, by using the compressed air tube 94 and high-pressure water tube 95 mounted on the sediment blowing device 93, it is possible to remove the sediment 43 over a wide range in the horizontal direction even from one perforation 47. Can be done.

Also, the arrangement of the compressed air tube 94 and high pressure water tube 95 described in Example 5 will be explained.

Figure 6 is an explanatory diagram illustrating the arrangement of the compressed air tube 94 and the high-pressure water tube 95 described in Example 5.

As shown in FIG. 6, in Example 5, one compressed air tube 94 and multiple (five in Example 5) high-pressure water tubes 95 (95a, 95b, 95c, 95d, 95e) are installed. The five high-pressure water tubes are installed to surround the compressed air tube 94 in a semicircular shape, and the crushed fragments of the deposits 43 are pushed in the direction of the sand pump 62. This allows the crushed fragments of the deposits 43 to be efficiently pushed in the direction of the sand pump 62.

Furthermore, the outer diameter of the compressed air tube 94 and the outer diameter of the five high-pressure water tubes 95 are 20 mm or less. The inner diameter of the five high-pressure water tubes 95 is made smaller than the inner diameter of the compressed air tube 94, and the crushed pieces of the deposits 43 are pushed toward the sand pump 62. This allows the deposits 43 that have accumulated in a solidified state in the stagnant water 42 to be efficiently crushed by compressed air, and the crushed pieces of the deposits 43 to be lifted up.

Furthermore, the five high-pressure water tubes 95 have their ends bent in an L-shape, with their outlets pointing in the same direction. The length of the bent portion is 70 mm or less. This allows the crushed pieces of the deposits 43 to be efficiently swept away in the direction of the sand pump 62.

Furthermore, the outlets of the five high-pressure water tubes 95 are installed lower than the outlet of the compressed air tube 94. The high-pressure water discharged from the five high-pressure water tubes 95 is directed horizontally, and the compressed air discharged from the compressed air tube 94 is directed vertically.

This allows the compressed air to break up the sediments 43 that have accumulated in a solid state in the stagnant water 42, and also efficiently lift up the crushed pieces of the sediments 43, allowing the crushed pieces of the sediments 43 to be efficiently swept away in the direction of the sand pump 62.

By installing the five high-pressure water tubes 95 in this way, high-pressure water can be released in the same direction, forming a wide and strong flow in the direction of the sand pump 62 in the accumulated water 43. can do.

Furthermore, the compressed air from the compressed air tube 94 stirs up the crushed pieces of the deposits 43. That is, in Example 5, the deposits 43 that have accumulated in a solid state in the stagnant water 42 are crushed by compressed air, and the crushed pieces of the deposits 43 are stirred up.

Then, the high-pressure water of the five high-pressure water tubes 95 reliably sweeps away the crushed pieces of the deposit 43 rolled up in the direction of the sand pump 62 in a wide and strong flow.

In addition, a member that fixes the outlet direction of the high-pressure water tubes 95 may be installed at the bent L-shaped tip of each of the five high-pressure water tubes 95.

The method of removing deposits described in Example 5 can also be applied in cases where deposits 43 are partially removed from specific locations in order to investigate something buried under the deposits 43.

According to Example 5, by using a small, self-propelled drilling device 51, a sediment removal device 61, and a sediment drift device 93 that are easily remotely operated, it is possible to partially remove the sediments 43 from specific locations even when sediments 43 have accumulated in the stagnant water 42 inside a structure 41, the top of the stagnant water 42 is covered with a grating 44, and there is a possibility that toxic gases or the like are being generated inside the structure 41.

Further, according to the fifth embodiment, there is no need for the worker to enter the building 41, and therefore, there is no need for the worker to enter the building 41, and therefore, there is no need for the worker to enter the building 41, even if there is a possibility that toxic gas or the like is generated in the closed space inside the building 41. Even if the building 41 is closed, a worker can safely remove the deposits 43 accumulated in the accumulated water 42 in the building 41.

Further, according to the fifth embodiment, it can be used for deposits 43 deposited in retained water 42 in an existing building 41 with a horizontal bottom surface.

In addition, according to Example 5, a grating 44 is provided above the stagnant water 42, so there are spatial restrictions on the installation of the device, and it can be used even in a narrow building 41.

Furthermore, according to Example 5, even if a sand pump 62 without a horizontal scanning function is used, it is possible to remove deposits 43 from a wider range in the horizontal direction than the drilling section 47.

The present invention is not limited to the above-mentioned embodiment, but includes various modifications. For example, the above-mentioned embodiment is specifically described in order to explain the present invention in an easy-to-understand manner, and is not necessarily limited to having all of the configurations described.

Furthermore, a part of the configuration of one embodiment can be replaced with a part of the configuration of another embodiment. Furthermore, the configuration of another embodiment can be added to the configuration of one embodiment. Further, it is also possible to delete a part of the configuration of each embodiment, add a part of another configuration, or replace it with a part of another configuration.

1, 41...structure, 2, 42...stagnant water, 3, 43...sediment, 4...floor, 44...grating, 5, 45...opening, 6, 46...anteroom, 7, 47...drilling section, 11, 51...drilling device, 12, 23, 52, 63...controller, 13...abrasive supply device, 14...water tank, 15...high pressure pump, 21, 61...sediment removal device, 22, 62...sand pump, 24...sediment collection container, 25...supernatant collection tank, 26...supernatant transfer pump, 27...separator, 28...sand pump with thruster, 29...sand pump with crawler, 53...electric discharge machining power source, 65...sediment storage container, 93...sediment blowing device, 94...compressed air tube, 95...high pressure water tube.

Claims (5)

This is a case where sediment has accumulated in accumulated water in a building, and the upper part of the accumulated water is covered by a structure, and sediment removal is performed to partially remove the sediment from a specific location. A method,
Drilling a specific location on the structure above the accumulated water to form a perforated part in the structure, dropping a sand pump into the accumulated water from the perforated part,
One compressed air tube that injects compressed air and a plurality of high-pressure water tubes that inject high-pressure water are arranged such that one compressed air tube is surrounded in a semicircle by the plurality of high-pressure water tubes. , installed in the stagnant water,
The inner diameter of the plurality of high pressure water tubes is smaller than the inner diameter of one of the compressed air tubes,
The tips of the plurality of high-pressure water tubes are bent into an L shape, and the outlet portions thereof face in the same direction,
The outlet portions of the plurality of high-pressure water tubes are installed below the outlet portion of one of the compressed air tubes,
High-pressure water injected from the plurality of high-pressure water tubes is directed in a horizontal direction, compressed air injected from one of the compressed air tubes is directed in a vertical direction,
The compressed air is injected from the compressed air tube onto the surface of the sediment to stir up crushed pieces of the sediment into the accumulated water, and the high pressure water is injected from the high pressure water tube to remove the sediment. pushing the crushed pieces of material in the direction of the sand pump;
suctioning the accumulated water and the sediment as suspended water by the sand pump ;
A method for removing deposits, comprising transporting the suspended water, separating the suspended water into the retained water and the deposits at a destination, and removing the deposits. The method for removing deposits according to claim 1,
11. A method for removing deposits, comprising the steps of: forming a hole in a floor of a structure; and forming the hole by water jet cutting. The deposit removal method according to claim 1, comprising:
A method for removing deposits, wherein the structure is a grating, and the perforated portion is formed by perforation by electric discharge machining. The deposit removal method according to claim 1, comprising:
The method for removing deposits, wherein the sand pump has a mechanism that moves horizontally in the accumulated water, moves in the horizontal direction in the accumulated water, and sucks the suspended water . The method for removing deposits according to claim 1 ,
A method for removing sediments, comprising the steps of: confirming that an amount of the separated sediments increases as the suspended water is sucked.

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