JP7019229B1 - Stirring system and stirring method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a stirring system and a stirring method capable of appropriately stirring muddy water and an injection in a buried hole in backfilling of the buried hole. SOLUTION: This is a system for stirring an injection injected into the buried hole and muddy water in the buried hole in a buried hole which is a hole after pulling out a buried pile buried in the ground. It is a stirring system having a suction device that sucks the muddy water in the inside and sends it to the cyclone device, and the cyclone device that returns the muddy water sucked by the suction device to the buried hole, and the suction device has a tubular shape. A jet ejection portion that ejects water upward by a first angle on the inner wall near the lowermost portion of the housing, and an inner wall above the jet ejection portion of the housing by a second angle upward. The muddy water in the buried hole is sucked by the rising vortex generated by the water ejected by the jet ejection portion and the air ejected by the air ejection portion, and the sucked muddy water. Is pulled up to the upper part of the housing, the pulled up muddy water is delivered to the cyclone device, and the cyclone device removes air from the muddy water received from the suction device and returns it to the buried hole. [Selection diagram] Fig. 1

Description

The present invention relates to a stirring system and a stirring method.

For example, when rebuilding a building, the existing building is dismantled and removed, and the foundation pile (buried pile) buried in the ground is pulled out. In the work of pulling out the buried pile, the hole remaining after pulling out the buried pile (hereinafter referred to as the buried hole) is backfilled. This backfilling is performed, for example, by injecting fluidized soil, cement bentonite milk, or the like into the buried hole and solidifying it.

For example, in a construction method for pulling out a buried pile, an injection such as cement bentonite milk is injected while pulling out the buried hole. In this construction method, for example, muddy water generated from the original ground is accumulated in the lower part of the buried hole, and the injected material is accumulated in the upper part of the buried hole, so that the injected material and the muddy water are separated. When the injectate and muddy water separate, the lower muddy water portion does not solidify.

Therefore, in backfilling, muddy water and the injectate may be agitated.

The technique relating to stirring is described in the following patent documents.

Japanese Unexamined Patent Publication No. 7-82744 Japanese Unexamined Patent Publication No. 2018-135741

However, the size of the buried hole varies depending on the work site. For example, when the depth of the buried hole is deeper than a predetermined value or the size of the buried hole diameter is more than a predetermined value, for example, even if the apparatus described in the above patent document is used, the stirring may not be performed properly.

Further, depending on the work site, the mud mass adhering to the buried hole may fall and interfere with the stirring, so that the stirring may not be performed properly.

Therefore, one disclosure provides a stirring system and a stirring method capable of appropriately stirring the muddy water and the injectate in the buried hole in the backfilling of the buried hole.

A system that agitates the injection injected into the buried hole and the muddy water in the buried hole in the buried hole, which is the hole after the buried pile buried in the ground is pulled out, and the muddy water in the buried hole is agitated. A stirring system including a suction device that sucks and sends out to a cyclone device and the cyclone device that returns the muddy water sucked by the suction device to the buried hole, wherein the suction device has a tubular housing. A jet ejection portion that is configured to eject water upward by a first angle on the inner wall near the lowermost portion of the housing, and air is ejected upward by a second angle on an inner wall above the jet ejection portion of the housing. The muddy water in the buried hole is sucked by the rising vortex generated by the water ejected by the jet ejection portion and the air ejected by the air ejection portion, and the sucked muddy water is used as the housing. The pulled up muddy water is handed over to the cyclone device, and the cyclone device removes air from the muddy water received from the suction device and returns it to the buried hole.

According to one disclosure, in backfilling a buried hole, the muddy water and the injectate in the buried hole can be circulated and agitated appropriately and quickly.

FIG. 1 is a diagram showing an example of a stirring system. FIG. 2 is a diagram showing an example of the suction device 10. FIG. 3 is a diagram showing an example of the air ejection portion 11. FIG. 4 is a diagram showing an example of the high pressure jet ejection unit 12. FIG. 5 is a diagram showing an example of a high-pressure cut jet ejection portion 13. FIG. 6 is a diagram showing an example of the inner wall of the pipe portion 14. FIG. 7 is a diagram showing an example of the stirring system 1 in the second embodiment.

[First Embodiment]
The first embodiment will be described.

<Stirring system 1>
FIG. 1 is a diagram showing an example of a stirring system. The stirring system 1 includes a suction device 10, a chain 20, a hose 30, a cyclone 40, a jet hose 60, and an air hose 50. The stirring system 1 is a system for stirring, for example, the cement bentonite milk (injection) injected in the backfilling and the muddy water in the buried hole.

Cement bentonite milk is injected into the burial hole, for example, while pulling out the burial pile. By injecting cement bentonite milk while pulling out the buried pile, the buried pile enters the upper part of the pulled out buried hole and is not mixed with the muddy water at the bottom. The injectate is, for example, a solidifying agent that hardens to a desired hardness after a lapse of a predetermined time, and may be other than cement bentonite milk.

Muddy water is a mixture of water and earth and sand (mud, mud mass, etc.) at the site of the burial hole. Water is injected into the buried hole at the extraction site, and is injected, for example, from the tip of the casing used when excavating the buried pile.

The suction device 10 is a device that sucks muddy water (or a mixture of muddy water and an injection such as cement bentonite milk) from the bottom of the buried hole. The details of the suction device 10 will be described later.

The suction device 10 is suspended from the chain 20. The chain 20 is a metal chain or wire that can withstand a predetermined weight or more. The suction device 10 is carried into the buried hole via the chain 20 by, for example, a mobile crane. The muddy water sucked up by the suction device 10 is conveyed to the cyclone 40 through the hose 30.

Further, the suction device 10 is connected to the jet hose 60 and the air hose 50.

The jet hose 60 is a hose that supplies water to the suction device 10, and is connected to, for example, a high-pressure pump.

The air hose 50 is a hose that supplies air to the suction device 10, and is connected to, for example, an air compressor.

The cyclone 40 has an air bleeding portion 41 and a muddy water injection portion 42. The cyclone 40 removes air from the conveyed muddy water and releases the air removed from the air bleeding portion 41. Then, the cyclone 40 ejects the deflated muddy water from the muddy water injection portion 42 toward the buried hole.

The stirring system 1 removes air from the muddy water sucked by the suction device 10 with the cyclone 40 and returns it to the buried hole. As a result, the process of sucking up the muddy water at the bottom of the buried hole and returning the sucked up muddy water to the upper part of the buried hole is repeated, and the muddy water in the buried hole and the injection such as cement bentonite milk can be circulated and agitated. can.

<Suction device 10>
FIG. 2 is a diagram showing an example of the suction device 10. The suction device 10 has a hose connection portion 15, a pipe portion 14, an air ejection portion 11, a high pressure jet ejection portion 12, and a high pressure cut jet ejection portion 13.

The hose connection portion 15 is a portion that connects the hose 30 and the pipe portion 14, and is, for example, a flange made of metal such as iron.

The pipe portion 14 is a passage for sucked up muddy water, and is, for example, a tubular metal pipe. The upper part of the pipe part 14 is connected to the hose connection part 15, and the lower part has a hole (suction port).

The air ejection portion 11 is a device for ejecting air into the pipe portion 14, and is connected to the air hose 50. The air ejected to the pipe portion 14 rises in the pipe portion 14 and raises muddy water.

The high-pressure jet ejection portion 12 is a device for ejecting water into the pipe portion 14, and is connected to the jet hose 60. The water ejected to the pipe portion 14 constitutes an ascending water flow, sucks muddy water from the suction port, and raises the muddy water to the vicinity (or further upper part) of the air ejection portion 11.

The high-pressure cut jet ejection portion 13 is a device for ejecting water toward the lower side of the suction port (lower outside of the pipe portion 14), and is connected to the jet hose 60. The water ejected from the lower outside of the suction port crushes the mud lumps and the like existing near the suction port to make them finer. The suction device 10 can prevent the suction from being obstructed by blocking the suction port with the mud mass by finely crushing the mud mass near the suction port. Further, the suction device 10 can finely crush the mud mass near the suction port, confuse it with the muddy water, and suck it as a part of the muddy water.

Hereinafter, each of the air ejection unit 11, the high-pressure jet ejection unit 12, and the high-pressure cut jet ejection unit 13 will be described.

<Air ejection part 11>
FIG. 3 is a diagram showing an example of the air ejection portion 11. The air ejection unit 11 has an air outlet 111 and an air outlet 112. The air outlet 111 and the air outlet 112 are installed on opposite sides (positions of 180 degrees) with the center of the inner diameter circle of the pipe portion 14, for example. When there are three or more air outlets, for example, they are evenly arranged on the inner diameter of the pipe portion 14 (on an even angle from the center).

The air outlet ejects air diagonally upward (upper second angle) in the vertical direction. The direction of ejection is, for example, a direction 45 degrees above the horizontal. Further, the air outlets are installed so as not to face the center of the inner diameter of the pipe in the left-right direction but to face in the opposite direction with the center of each other. The reason why the air is not directed toward the center of the inner diameter is to prevent the ejected air from colliding with each other. Further, the ejection direction may be determined according to, for example, the amount of the ejected air per unit time, the ejection momentum (force), the time interval for ejecting the air, and the like.

As shown in FIG. 3, the air outlet 111 and the air outlet 112 eject air in opposite directions with respect to, for example, the center of the inner diameter. As a result, the air ejected from the air outlet forms an ascending vortex. The air ejection portion 11 can suck up muddy water and lift the muddy water to the upper part by the rising vortex.

<High pressure jet ejection part 12>
FIG. 4 is a diagram showing an example of the high pressure jet ejection unit 12. The high-pressure jet ejection unit 12 has a high-pressure jet outlet 121 and a high-pressure jet outlet 122. The high-pressure jet outlet 121 and the high-pressure jet outlet 122 are installed on opposite sides (positions of 180 degrees) with the center of the inner diameter circle of the pipe portion 14, for example. When there are three or more jet ejection portions, for example, they are evenly arranged on the inner diameter of the pipe portion 14 (on an even angle from the center).

The high-pressure jet outlet ejects water diagonally upward (upward by the first angle) in the vertical direction. The high-pressure jet outlet ejects water at a pressure equal to or higher than a predetermined ejection intensity. The direction of ejection is, for example, a direction 45 degrees above the horizontal. Further, the ejection direction may be determined according to, for example, the amount of ejected water per unit time, the ejection momentum (force), the time interval for ejecting water, and the like. Further, the high-pressure jet outlets are installed so as not to face the center of the inner diameter of the pipe in the left-right direction but to face in the opposite direction with the center of each other. The reason why the water is not directed toward the center of the inner diameter is to prevent the ejected water from colliding with each other.

As shown in FIG. 4, the high-pressure jet outlet 121 and the high-pressure jet outlet 122 eject water in opposite directions with respect to, for example, the center of the inner diameter. As a result, the water ejected from the high-pressure jet outlet forms an ascending vortex. The high-pressure jet ejection unit 12 can suck up muddy water and lift the muddy water to the upper part by the rising vortex.

<High pressure cut jet ejection part 13>
FIG. 5 is a diagram showing an example of a high-pressure cut jet ejection portion 13. The high-pressure cut jet ejection unit 13 has a high-pressure cut jet outlet 131 and a high-pressure cut jet outlet 132. The high-pressure cut jet outlet 131 and the high-pressure cut jet outlet 132 are installed on opposite sides (positions of 180 degrees) with the center of the inner diameter circle of the pipe portion 14, for example. When there are three or more cut jet ejection portions, for example, they are evenly arranged on the inner diameter of the pipe portion 14 (on an even angle from the center).

The high-pressure jet outlet ejects water at a pressure equal to or higher than a predetermined ejection intensity. The pressure is, for example, strong enough to break the mud mass present in the local buried hole. The intensity of ejecting water may be determined, for example, according to the local geology (hardness and amount of mud mass).

The high-pressure cut jet outlet ejects water diagonally downward (downward by the third angle) in the vertical direction. The ejection direction is, for example, 0 to 45 degrees below the horizontal direction, and is the suction port direction of the pipe portion 14. Further, the ejection direction may be determined according to, for example, the amount of ejected water per unit time, the ejection momentum (force), the time interval for ejecting water, and the like. Further, the high-pressure cut jet outlet is in the left-right direction toward the center of the inner diameter of the pipe. The high-pressure cut jet outlet 131 and the high-pressure cut jet outlet 132 eject water toward a certain point (for example, the center of the inner diameter), so that the water ejected from the high-pressure cut jet outlet is muddy soil existing near the certain point. Water can be applied from multiple directions by concentrating on the mass, and it can be crushed efficiently.

The suction device 10 of the first embodiment can suck up muddy water by having an air ejection portion 11 and a high-pressure jet ejection portion 12, and also has a high-pressure cut jet ejection portion 13 in the vicinity of the suction port. Can crush mud lumps and the like. Further, the cyclone 40 can appropriately agitate the muddy water and the cement bentonite milk by removing the air from the sucked muddy water and returning it to the buried hole.

For example, when muddy water is sucked only by the air ejection portion 11, the suction force may be weak and the stirring may not be properly circulated. However, in the first embodiment, the high-pressure jet ejection unit 12 is combined to generate a pressure difference (water pressure difference) to increase the suction force, and the circulation of stirring can be appropriately performed.

The pipe portion 14 may have, for example, a plurality of (for example, three) slits (or spiral grooves) in the diagonally upward direction on the inner wall. As a result, a vortex along the slit is likely to be generated, and muddy water is easily sucked.

Further, instead of the slit, a plate-shaped or rod-shaped metal may be attached to the inner wall. FIG. 6 is a diagram showing an example of the inner wall of the pipe portion 14. As shown in FIG. 6, when the pipe portion 14 is viewed from above, the upper portion of the plate-shaped metal is attached so as to have a spiral shape.

According to some experimental data, the stirring system 1 of the first embodiment performs stirring in about 1/3 of the time as compared with stirring with the rotary table device disclosed in, for example, Japanese Patent Application Laid-Open No. 2018-135741. be able to. The degree of stirring is determined, for example, from the specific gravity and color of the liquid after stirring the muddy water and the injectate. Further, the degree of stirring may be appropriately solidified as an index.

Further, the stirring system 1 of the first embodiment can suppress the use of heavy machinery as compared with, for example, the rotary table device disclosed in Japanese Patent Application Laid-Open No. 2018-135741. For example, heavy machinery may be used to install or remove the system, but heavy machinery is not used in the stirring work itself.

[Second Embodiment]
In the second embodiment, the stirring system 1 further comprises a mini silo. FIG. 7 is a diagram showing an example of the stirring system 1 in the second embodiment. The stirring system 1 further includes a mini silo 70.

The mini silo 70 is, for example, a device that supplies powdered cement to the cyclone 40. The mini silo 70 has a supply port 71. The mini silo 70 supplies powdered cement to the cyclone 40 via the supply port 71.

When the stirring system 1 of the second embodiment is used, the injection containing the cement component such as cement bentonite milk is not injected into the buried hole in the step of pulling out the buried pile. The injection in the second embodiment is bentonite water, which is injected in the process of drawing out the buried pile.

Then, in the stirring step, the cyclone 40 mixes the powdered cement supplied from the mini silo 70 with muddy water and returns it to the buried hole. As a result, powdered cement is supplied into the buried hole and can be solidified. The cyclone 40 may stir muddy water and powdered cement in its own device.

For example, when injecting cement bentonite milk in the extraction process, a large-scale device such as a fully automated plant for injecting cement bentonite milk is required, and the cost becomes enormous. In addition, the amount of cement bentonite milk injected may decrease due to spring water, which may affect solidification.

Therefore, in the second embodiment, the cement composition can be controlled to a target amount by adding powder cement at the time of stirring after injecting bentonite water.

[Other embodiments]
The suction device 10 may be incorporated in, for example, the rotary table device shown in Japanese Patent Application Laid-Open No. 2018-135741. At the work site, the worker may decide which of the stirring mechanism to use in consideration of the situation of the work site, and switch the operation.

Further, the suction device 10 may be used only for sucking up muddy water, for example, at a work site.

Further, the stirring system 1 may be composed of separate devices or may be one integrated device.

1: Stirring system 10: Suction device 11: Air ejection part 12: High pressure jet ejection part 13: High pressure cut jet ejection part 14: Pipe part 15: Hose connection part 20: Chain 30: Hose 38: Stirring blade 40: Cyclone 41: Air bleeding part 42: Muddy water injection part 60: Jet hose 50: Air hose 70: Mini silo 71: Supply port 111: Air outlet 112: Air outlet 121: High pressure jet outlet 122: High pressure jet outlet 131: High pressure cut Jet outlet 132: High pressure cut Jet exit

Claims (13)

It is a system that agitates the injection material injected into the hole and the muddy water in the hole .
A stirring system including a suction device that sucks muddy water in the hole and sends it to a cyclone device, and the cyclone device that returns the muddy water sucked by the suction device to the hole .
The suction device is
Consists of a tubular housing,
On the inner wall near the bottom of the housing, a jet ejection part that ejects water above the first angle,
An air ejection portion that ejects air above the second angle is provided on the inner wall above the jet ejection portion of the housing.
The muddy water in the hole was sucked by the rising vortex generated by the water ejected by the jet ejection portion and the air ejected by the air ejection portion, and the sucked muddy water was pulled up to the upper part of the housing and pulled up. Hand over the muddy water to the cyclone device,
The cyclone device removes air from the muddy water received from the suction device and returns it to the hole .
Stirring system. The stirring system according to claim 1, wherein the suction device further has a cut jet ejection portion that ejects water downward at a third angle on the inner wall of the housing below the jet ejection portion. The stirring system according to claim 1, wherein the jet ejection unit ejects water from a plurality of locations. The stirring system according to claim 3, wherein the jet ejection unit ejects water from the plurality of locations in a direction in which the water ejected from each of the plurality of locations does not collide with each other. The stirring system according to claim 1, wherein the air ejection unit ejects air from a plurality of locations. The stirring system according to claim 5, wherein the air ejection unit ejects air from the plurality of locations in a direction in which the air ejected from each of the plurality of locations does not collide with each other. The stirring system according to claim 2, wherein the cut jet ejection unit ejects water from a plurality of locations. The stirring system according to claim 7, wherein the cut jet ejection unit ejects water from each of the plurality of locations so that the water ejected from each of the plurality of locations is directed toward the center of the inner diameter of the housing. Further, it has a mini silo device that supplies powdered cement to the cyclone device.
The stirring system according to claim 1, wherein the cyclone device confuses the powdered cement supplied from the mini silo device with the muddy water and returns it to the pores . The stirring system according to claim 9, wherein the injected material is bentonite water injected into the hole in the step of drawing out the buried pile. The stirring system according to claim 10, wherein the injection containing the cement component is not injected in the process of pulling out the buried pile. The stirring system according to claim 1, wherein the injected material is cement bentonite milk injected into the hole in the step of pulling out the buried pile. It is a stirring method for stirring an injection injected into a hole and muddy water in the hole .
The suction device sucks the muddy water in the hole and sends it to the cyclone device .
The cyclone device removes air from the muddy water received from the suction device and returns it to the hole.
The suction device is composed of a tubular housing, and has a jet ejection portion that ejects water upward by a first angle on an inner wall near the lowermost portion of the housing, and a jet ejection portion above the jet ejection portion of the housing. The inner wall has an air ejection part that ejects air above the second angle, and the muddy water in the hole is generated by the rising vortex generated by the water ejected by the jet ejection portion and the air ejected by the air ejection portion. A stirring method in which suction is performed, the sucked muddy water is pulled up to the upper part of the housing, and the pulled up muddy water is handed over to the cyclone device.

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