Eco-friendly stirring device for slime reduction ground improvement and ground improvement method

Abstract

The present invention comprises: a slime storage space part inside an auger shaft; and a slime storage space part pressure changing means for changing the pressure of the slime storage space part so that the slime is suctioned into the slime storage space part or the slime of the slime storage space part is discharged to the lower portion of the auger shaft, in order to, when mixing the improvement material and the soil under the ground for ground improvement, suction up the slime moving upward and inject the slime back into the ground, and thus prevent the slime from being discharged to the ground surface.

Description

Environmentally friendly slime reduction ground improvement mixing device and ground improvement method

[0001] The present invention relates to an environmentally friendly slime-reducing ground improvement stirring device and ground improvement method, which can prevent slime from being discharged to the ground surface by sucking up slime moving upward within excavated ground when mixing improvement materials and soil for ground improvement and reintroducing it into the ground.

[0002] Generally, agitating devices for ground improvement are used in deep mixing treatment methods, which are special equipment (Multi-Shaft Auger Machine) that can rotate a single-axis to three-axis auger shafts equipped with stirring blades to inject cement, bentonite, lime, solidifying agents, slag, microorganisms, or other materials that can improve the properties of the soil or solidify or treat pollutants into the soil at low or high pressure, thereby causing physical and chemical changes such as an increase in unit weight, a decrease in water content, an increase in binding force, and microbial treatment, thereby increasing water permeability and compressive strength, and preventing the spread of contamination.

[0003] Fig. 1 is a drawing of an example using a conventional deep mixing treatment method. As illustrated, the conventional method is used in civil engineering to reinforce soft ground, to form an earth retaining wall for underground excavation, and to form a water stop wall for river embankments. In the field of geological environments, it is used as a shielding wall to block the movement of contaminated groundwater in unsanitary landfills, abandoned mines, etc., or to stabilize or fix contaminated soil to prevent the spread of heavy metal or semi-volatile organic compound contamination. It is also used for biological treatment of contaminated soil by mixing it with microorganisms and injecting it into the ground. Furthermore, it is used to form a permeable wall that has the function of purifying contaminated groundwater by injecting zeolite, etc.

[0004]

[0005] In the process of improving soft ground like this, a certain amount of slime is discharged to the upper part of the ground during the process of mixing and injecting improvement materials such as cement paste into the soil.

[0006] This slime is a composition that is distributed by mixing the improvement material and the soil of the original ground, that is, cement-based chemicals and ground soil. Since it is mixed with cement, the hardening process proceeds over time, and especially when it is disposed of as waste, it is disposed of through a designated company after satisfying the relevant government laws, so a lot of money is spent on it.

[0007] In addition, the above slime not only causes pollution of the soil environment, but also acts as an obstacle that hinders the foundation work or causes poor foundation work, so the removal of the applied slime is absolutely necessary, and the slime removal process is carried out in parallel with or separately from the foundation work.

[0008]

[0009] Accordingly, in recent years, rather than simply collecting and disposing of slime that is discharged during foundation work, the collected slime is being processed separately to enable it to be recycled or turned into a resource.

[0010] However, as explained above, in order to reprocess slime, which is a mixture of soil and solidified materials containing moisture and stones, various processes are required, such as a process for collecting slime in advance and a process for selecting only recyclable components from the slime, and various facilities must be provided accordingly. Therefore, there was a problem that a lot of time and money had to be spent on the preliminary process of slime reprocessing.

[0011]

[0012] In addition, collecting the slime that is discharged in this way and making it a resource or recycling through a separate reprocessing process is only possible in land-based operations, and in the case of soft ground improvement methods at sea, it is difficult to collect the discharged slime, so the slime flows into the water and becomes a cause of marine pollution.

[0013]

[0014] The present invention has been devised to solve the problems of the prior art as described above, and provides an eco-friendly slime-reducing ground improvement stirring device and ground improvement method that can prevent slime from being discharged to the ground surface by sucking up slime moving upward in excavated ground when mixing ground improvement materials and soil in the ground for ground improvement and reintroducing it into the ground.

[0015] In order to solve the above problem, the present invention provides a ground improvement stirring device comprising at least one auger shaft that is rotatable for excavating and improving ground, an excavation means provided on an outer circumference of the auger shaft, a stirring means provided on an outer circumference of the auger shaft, and an improvement material supply path provided on the auger shaft so that improvement material is supplied along an axial direction of the auger shaft and ejected from a lower portion of the auger shaft: at least one of the auger shafts is provided with a slime suction and discharge means for sucking up slime moving upward within excavated ground and discharging it toward the ground from a lower portion of the auger shaft; The above slime suction and discharge means comprises: a slime storage space portion in the form of an empty space extending vertically inside the auger shaft; a slime inlet passage provided in the vertical middle of the auger shaft to connect the outside of the auger shaft and the slime storage space portion; a slime suction check valve provided in the slime inlet passage to allow the slime to flow only in the direction in which the slime flows into the slime storage space portion; a slime outlet passage provided inside the auger shaft and extending downward from the top connected to the slime storage space portion; a slime discharge check valve provided in the slime outlet passage to allow the slime to flow only in the direction in which the slime flows out through the slime outlet passage; and a device for changing the pressure of the slime storage space portion so that the slime is sucked into the slime storage space portion from the outside of the auger shaft through the slime inlet passage or the slime in the slime storage space portion is discharged to the lower portion of the auger shaft through the slime outlet passage. It is characterized by including a means for changing the pressure of the space for storing slime.

[0016] In the above, the auger shaft is in the form of a pipe with an interior that extends vertically, and it is preferable that the slime storage space portion uses the inner circumference of the auger shaft as a wall.

[0017] In the above, the slime storage space pressure change means may include an air depressurization and pressurization means for discharging air inside the slime storage space to the outside or supplying pressurized air to the slime storage space.

[0018] In the above, the air pressure reducing and pressurizing means may include a ground surface air pressure control unit installed on the ground surface, and an air pipe for the outside of the auger shaft connecting the ground surface air pressure control unit and the inside of the auger shaft.

[0019] In the above: an air pipe for internal use of the auger shaft is provided inside the auger shaft to be connected to an air pipe for external use of the auger shaft; the air pipe for internal use of the auger shaft may include an internal / external connection air pipe for connecting to the external air pipe for external use of the auger shaft, an air intake pipe connected to the internal / external connection air pipe for intake of air from an upper part of the interior of the slime storage space, an air intake check valve provided in the air intake pipe to allow air to flow only in the direction in which the air is introduced into the internal / external connection air pipe, an air exhaust pipe connected to the internal / external connection air pipe for exhausting air to an inner lower part of the slime storage space, and an air exhaust check valve provided in the air exhaust pipe to allow air to flow only in the direction in which the air is exhausted into the slime storage space through the air exhaust pipe.

[0020] In the above, the slime storage space pressure change means may include a piston that can move up and down along the inside of the auger shaft as an upper cover of the slime storage space, a piston rod whose lower end is connected to the piston, and a driving source that drives the piston rod.

[0021]

[0022] Another aspect of the present invention is characterized by improving the ground using the above-mentioned ground improvement stirring device.

[0023]

[0024] As described above, the present invention provides an eco-friendly slime-reducing ground improvement stirring device and ground improvement method that can prevent slime from being deposited on the ground surface by sucking up slime moving upward within excavated ground when mixing ground improvement materials and soil in the ground for ground improvement and reintroducing it into the ground.

[0025] Accordingly, the present invention can reduce the cost of treating or recycling slime that has been discharged to the ground surface as waste.

[0026] In addition, the present invention can minimize marine pollution caused by the release of slime, especially in a soft ground improvement method at sea.

[0027] Figure 1 is a drawing of an example using a conventional deep mixing processing method.

[0028] Figure 2 is a conceptual diagram of a ground improvement stirring device according to the first embodiment of the present invention.

[0029] Figure 3 is a conceptual diagram showing the main part enlarged in Figure 2.

[0030] Fig. 4 is a cross-sectional view taken along line AA of Fig. 3;

[0031] Figure 5 is a drawing expressing a state in which slime outside the ogre shaft in Figure 3 is sucked into the slime storage space.

[0032] Figure 6 is a drawing expressing a state in which slime in the slime storage space of Figure 3 is discharged to the lower part of the auger shaft.

[0033] Figure 7 is a drawing expressing a state in which slime outside the auger shaft is sucked into a slime storage space in a ground improvement stirring device according to the second embodiment of the present invention.

[0034] Figure 8 is a drawing expressing a state in which slime in the slime storage space of the ground improvement stirring device of Figure 7 is discharged to the lower part of the auger shaft.

[0035] Figure 9 is a drawing expressing a state in which slime outside the auger shaft is sucked into a slime storage space in a ground improvement stirring device according to a third embodiment of the present invention.

[0036] Figure 10 is a drawing showing a state in which slime in the slime storage space of the ground improvement stirring device of Figure 9 is discharged to the lower part of the auger shaft.

[0037]

[0038] Below, with reference to the attached drawings, embodiments of the present invention are described in detail so that those skilled in the art can easily implement them. However, the present invention may be implemented in various different forms and is not limited to the embodiments described herein. In the drawings, irrelevant parts have been omitted for clarity of description, and similar reference numerals have been assigned to similar parts throughout the specification.

[0039] Throughout the specification, whenever a part is said to "include" a component, this does not mean that it excludes other components, but rather that it may include other components, unless otherwise stated.

[0040]

[0041] Hereinafter, a stirring device for ground improvement according to a first embodiment of the present invention will be described.

[0042] FIG. 2 is a conceptual diagram showing the state of use of a ground improvement stirring device according to a first embodiment of the present invention, FIG. 3 is a conceptual diagram showing the main part in FIG. 2 in an enlarged manner, FIG. 4 is a cross-sectional view taken along line AA of FIG. 3, FIG. 5 is a diagram showing a state in which slime outside the auger shaft in FIG. 3 is sucked into a slime storage space, and FIG. 6 is a diagram showing a state in which slime in the slime storage space in FIG. 3 is discharged to the lower part of the auger shaft.

[0043] This ground improvement stirring device is for excavating and improving the ground and has three auger shafts (110) that are provided to be rotatable.

[0044] That is, the two auger shafts (110) arranged on both sides and the one auger shaft (110) arranged in the center can each rotate.

[0045] In order to rotate the three auger shafts (110), an auger shaft drive unit for rotating the auger shafts (110) is provided at the upper end of the auger shafts (110).

[0046] The auger shaft drive unit includes a drive motor (101) that provides rotational force, and a split transmission (102) that divides the rotational force provided by the drive motor (101) and provides it to three auger shafts (110), and such a drive means is a well-known and widely known technology.

[0047] In this embodiment, three auger shafts (110) are provided, but the number of auger shafts may vary depending on the embodiment. That is, one auger shaft may be provided, or five auger shafts may be provided.

[0048] An excavation means and a stirring means are provided on the outer surface of each ogre shaft (110).

[0049] In this embodiment, the excavation means is an excavation blade (111) provided at the lower end of the auger shaft (110).

[0050] Each excavation blade (111) serves to excavate the ground, and it is common for an excavation bit for excavating the ground to be provided at the bottom of the excavation blade (111).

[0051] In this embodiment, the stirring means is a stirring screw (112) provided at the lower part of the auger shaft (110).

[0052] The stirring screw (112) serves to mix soil and improvement materials.

[0053] The shape of the excavation means and the shape of the stirring means can be modified in a wide variety of ways and are already known technologies.

[0054] Additionally, it is common for the excavation means and the stirring means to be fixed to the auger shaft (110) and rotate together with the auger shaft (110).

[0055] Depending on the embodiment, one or more of the auger shafts (110) may be equipped with a hammer bit at the bottom thereof. The hammer bit may be operated by supplying compressed air, and the compressed air that drives the hammer bit is typically ejected into the ground.

[0056] In addition, an improvement material supply path (not shown) is formed inside one or more of the auger shafts (110) so that the improvement material is supplied along the axial direction of the auger shaft (110) and ejected from the lower portion of the auger shaft (110).

[0057] In this embodiment, an improved material supply path (not shown) is provided inside two auger shafts (110) arranged on both sides, so that the improved material is ejected from the bottom of the two auger shafts (110) arranged on both sides.

[0058] The improved material ejected from the lower part of the excavation shaft (110) is mixed with the excavated ground.

[0059] The technology regarding the above-described ogeo-axis (110) is all known technology and is a premise of the present invention, and a wide variety of modifications are possible.

[0060] In addition, the technology described in the prior art proposed by the inventor of the present invention, Korean Patent No. 10-0497281, "Agitating device for ground improvement with enhanced excavation function and soft ground improvement method using the same" (registered on June 16, 2005), may be applied as is to the present invention.

[0061]

[0062] Below, technologies directly related to the features of the present invention are described.

[0063] Among the plurality of auger shafts (110), at least one auger shaft (110) is provided with a slime suction and discharge means for suctioning slime moving upward within the excavated ground and discharging it toward the ground from the lower portion of the auger shaft (110).

[0064] In the present embodiment, a slime suction and discharge means is provided on one of the three auger shafts (110) positioned in the center. However, this is only an example and various modifications are possible.

[0065] In addition, although it is illustrated that the excavation blade (111) and the stirring screw (112) are provided on the auger shaft (110) positioned in the center in FIG. 2, depending on the embodiment, the excavation blade (111) and the stirring screw (112) may not be provided on the auger shaft (110) positioned in the center.

[0066] Therefore, in this specification, the term "auger shaft provided with a slime suction and discharge means" refers to a pipe-shaped component that is connected to an auger machine, inserted into the ground, and extends vertically. In addition, unlike other auger shafts, the "auger shaft provided with a slime suction and discharge means" herein may not rotate.

[0067] Additionally, depending on the embodiment, the diameter of the "auger shaft provided with a slime suction and discharge means" may be smaller than that of other auger shafts. For example, four auger shafts for ground excavation and stirring may be arranged in a square shape on a plane, and a "auger shaft provided with a slime suction and discharge means" with a smaller diameter may be provided in the center of the square.

[0068] In this embodiment, the slime suction and discharge means includes a slime inlet passage (210), a slime storage space (220), a slime outlet passage (230), and a slime storage space pressure change means (240).

[0069] The slime storage space (220) is an empty space extending vertically inside the auger shaft (110).

[0070] Typically, the auger shaft (110) is in the form of a hollow pipe extending vertically. In the present embodiment, the slime storage space (220) uses the inner surface of the auger shaft (110) as a wall.

[0071] That is, in this embodiment, a separate additional device for forming a slime storage space (220) is not necessary, and since a portion of the vertical length of the empty internal space of the auger shaft (110) is utilized as the slime storage space (220), the slime storage space (220) can be a relatively very large space.

[0072] A slime inlet (210) is provided in the upper and lower middle portion of the auger shaft (110) to connect the outside of the auger shaft (110) with the slime storage space (220). To form the slime inlet (210), a hole is formed in the auger shaft (110).

[0073] In this embodiment, four slime inlet channels (210) are provided, but the number can be changed as desired.

[0074] In addition, in this embodiment, four slime inflow paths (210) are provided at the same height, but slime inflow paths (210) may be provided at different heights, or multiple slime inflow paths (210) may be provided at each of multiple heights.

[0075] The slime inlet (210) is placed above the stirring screw (112). This is because the improvement material must be mixed with the soil at the bottom of the slime inlet (210).

[0076] It is preferable that a strainer (not shown) be provided on the outside of the slime inlet (210). This is to prevent relatively large foreign substances such as gravel from flowing into the slime inlet (210) through the strainer (not shown).

[0077] A slime suction check valve (211) is provided for each slime inlet (210).

[0078] The slime suction check valve (211) is intended to allow the slime to flow only in the direction in which it flows into the slime storage space (220). In other words, the slime cannot flow out of the auger shaft (110) through the slime inlet passage (210) due to the slime suction check valve (211).

[0079] The slime outlet (230) is provided inside the auger shaft (110) and extends downward from the top connected to the slime storage space (220).

[0080] The slime discharge channel (230) extends vertically inside the auger shaft (110), and its upper end is connected to the slime storage space (220). In this embodiment, one slime discharge channel (230) is illustrated, but this may be changed depending on the embodiment.

[0081] In this embodiment, a separate pipe is provided inside the auger shaft (110) to form a slime discharge path (230). However, depending on the embodiment, the auger shaft (110) itself, which is empty inside, may be used as a slime discharge path (230).

[0082] A check valve (231) for slime discharge is provided in the slime discharge channel (230).

[0083] The slime discharge check valve (231) is intended to allow the flow of slime only in the direction in which the slime flows out through the slime discharge passage (230). In other words, the slime outside the auger shaft (110) cannot flow into the slime storage space (220) through the slime discharge passage (230) due to the slime discharge check valve (231).

[0084] The slime storage space pressure change means (240) is for changing the pressure of the slime storage space (220) to suck the slime outside the auger shaft (110) into the slime storage space (220) and also to discharge the slime in the slime storage space (220) to the lower part of the auger shaft (110).

[0085] Specifically, when the pressure of the slime storage space (220) is lowered by the slime storage space pressure change means (240), the slime can be sucked into the slime storage space (220) from the outside of the auger shaft (110) through the slime inlet passage (210) due to the pressure difference.

[0086] Conversely, when the pressure of the slime storage space (220) increases by the slime storage space pressure change means (240), the slime in the slime storage space (220) can be discharged to the lower part of the auger shaft (110) through the slime discharge path (230) due to the pressure difference.

[0087] In this embodiment, the space pressure change means (240) for slime storage may include air depressurization and pressurization means.

[0088] That is, the slime storage space pressure change means (240) can discharge air inside the slime storage space (220) to the outside to lower the pressure of the slime storage space (220), or supply pressurized air to the slime storage space (220) to increase the pressure of the slime storage space (220).

[0089] To this end, the present embodiment includes an air pressure control unit (241) for the ground surface and an air pipe (242) for the outside of the auger shaft as air depressurization and pressurization means.

[0090] The air pressure control unit (241) for the ground surface is installed on the ground surface and discharges the air inside the slime storage space (220) to the outside to lower the pressure of the slime storage space (220), or supplies pressurized air to the slime storage space (220) to increase the pressure of the slime storage space (220).

[0091] The air pressure control unit (241) for the ground surface may include one or more air supply pumps (centrifugal or reciprocating pumps), blowers, vacuum pumps, etc.

[0092] The external air pipe (242) of the auger shaft connects the air pressure control unit (241) for the ground surface and the upper part of the auger shaft (110), and it is preferable to use a hose shape that can freely change shape.

[0093] Accordingly, the air pressure control unit (241) for the surface can discharge the air inside the slime storage space (220) to the outside through the external air pipe (242) for the auger shaft, or can supply pressurized air inside the slime storage space (220) through the external air pipe (242), and thereby the inside of the slime storage space (220) can be depressurized or pressurized.

[0094] In addition, when the slime storage space (220) is depressurized, the slime is sucked into the slime storage space (220) from the outside of the auger shaft (110) through the slime inlet (210) due to the pressure difference, and conversely, when the pressure of the slime storage space (220) is increased by the slime storage space pressure change means (240), the slime in the slime storage space (220) is discharged to the lower part of the auger shaft (110) through the slime outlet (230) due to the pressure difference.

[0095] In this way, the slime ejected from the lower part of the ogeochuk (110) can be stirred and mixed with the soil again.

[0096] Meanwhile, when pressurized air is supplied from the surface air pressure control unit (241) to the slime storage space (220), the properties of the slime can be improved by injecting powder such as cement into the external air pipe (242) of the auger shaft and supplying it to the slime storage space (220) together with the pressurized air. To this end, a cyclone dust collector or the like can be connected to the external air pipe (242) of the auger shaft to inject powder such as cement into the external air pipe (242) of the auger shaft.

[0097]

[0098] The operation of this embodiment is explained.

[0099] This ground improvement stirring device excavates the ground using an excavation means provided on the auger shaft (110), and the improvement material is supplied into the excavated ground along the improvement material supply path, and the improvement material and soil are mixed and stirred by the stirring means provided on the auger shaft (110).

[0100] This action is identical to that of a conventional ground improvement stirring device.

[0101] As the improved materials and the original soil mix, some of this mixture migrates upward within the excavated ground as slime. If left unattended, this slime will be deposited on the surface, requiring disposal as waste.

[0102] In order to prevent the slime from being discharged outside the ground surface, this embodiment operates as follows.

[0103] As shown in Fig. 5, the air pressure control unit (241) for the ground surface is operated to discharge the air inside the slime storage space (220) to the outside through the external air pipe (242) of the auger shaft, thereby depressurizing the slime storage space (220).

[0104] When the slime storage space (220) is depressurized in this way, the slime outside the auger shaft (110) is sucked into the slime storage space (220) through the slime inlet (210) due to the pressure difference.

[0105] In this process, the slime outlet (230) is prevented from flowing in the reverse direction by the slime discharge check valve (231), and thus is effectively closed.

[0106] Since the slime storage space (220) is a relatively large space that utilizes the auger shaft (110) itself, it has sufficient space to absorb all external slime throughout the entire process of supplying and mixing the improved materials.

[0107] After sucking up the slime in this way, if it is determined that the ejection of the improvement material is complete and there is no more slime moving upward within the excavated ground, the air pressure control unit (241) for the ground surface is operated as shown in Fig. 6 to supply pressurized air to the slime storage space (220) through the external air pipe (242) of the auger shaft, thereby pressurizing the slime storage space (220).

[0108] When the slime storage space (220) is pressurized in this way, the slime in the slime storage space (220) is discharged to the outside toward the ground from the lower part of the auger shaft (110) through the slime discharge path (230) due to the pressure difference.

[0109] In this process, the slime inlet (210) is prevented from flowing in the reverse direction by the slime suction check valve (211), and thus is effectively closed.

[0110] Slime discharged to the outside in this way can be mixed with soil again.

[0111]

[0112] By the above process, most of the slime is reintroduced into the ground, so the amount of slime discharged to the outside is minimized.

[0113] Therefore, the present invention can reduce the overall cost of the ground improvement method by eliminating the need for a separate process for treating slime discharged externally.

[0114] Especially in soft ground improvement methods at sea, marine pollution caused by slime discharge can be minimized.

[0115]

[0116] Hereinafter, a second embodiment according to the present invention will be described.

[0117] FIG. 7 is a drawing showing a state in which slime outside an auger shaft is sucked into a slime storage space in a ground improvement stirring device according to a second embodiment of the present invention, and FIG. 8 is a drawing showing a state in which slime in a slime storage space is discharged to the lower part of an auger shaft in the ground improvement stirring device of FIG. 7.

[0118] This embodiment is basically substantially the same as the first embodiment, but unlike the first embodiment, an air pipe (243) for internal use of the auger shaft (110) is provided inside the auger shaft (110) and is connected to an air pipe (242) for external use of the auger shaft.

[0119] The internal air pipe (243) of the ogeo-axis includes an internal / external connection air pipe (243a), an air intake pipe (243b), and an air exhaust pipe (243c).

[0120] The air pipe (243a) for internal / external connection is a pipe for connecting to the external air pipe (242) of the auger shaft.

[0121] The air intake pipe (243b) is connected to the internal / external connection air pipe (243a) to intake air from the upper part of the interior of the slime storage space (220). That is, the air intake pipe (243b) is arranged at the upper part of the interior of the slime storage space (220).

[0122] The air intake pipe (243b) is provided with an air intake check valve (243b-1) that allows air to flow only in the direction in which it flows into the air pipe (243) inside the auger shaft. That is, when pressurized air is supplied to the slime storage space (220) to pressurize the slime storage space (220), the air intake pipe (243b) is closed by the air intake check valve (243b-1).

[0123] When the air in the slime storage space (220) is sucked in to depressurize the slime storage space (220), the air discharge pipe (243c) is closed by the air discharge check valve (243c-1).

[0124] The air exhaust pipe (243c) is connected to the internal / external connection air pipe (243a) to exhaust air to the internal lower part of the slime storage space (220). Therefore, the lower part of the air exhaust pipe (243c) is placed at the internal lower part of the slime storage space (220).

[0125] An air exhaust hole (243c-2) for air exhaust is formed at the bottom of the air exhaust pipe (243c).

[0126] The air exhaust pipe (243c) is provided with an air exhaust check valve (243c-1) that allows air to flow only in the direction of being discharged into the slime storage space (220). That is, when air in the slime storage space (220) is sucked in to depressurize the slime storage space (220), the air exhaust pipe (243c) is closed by the air exhaust check valve (243c-1).

[0127] In this embodiment, as shown in FIG. 7, the air pressure control unit (241) for the ground surface is operated to discharge the air inside the slime storage space (220) to the outside through the air pipe (242) for the outside of the auger shaft and the air pipe (243) for the inside of the auger shaft (particularly the air intake pipe (243b) and the air pipe (243a) for the internal / external connection), thereby allowing the slime storage space (220) to be depressurized.

[0128] At this time, the air exhaust pipe (243c) is prevented from flowing in the reverse direction by the air exhaust check valve (243c-1), and thus is effectively closed.

[0129] In addition, in this embodiment, as shown in FIG. 8, the air pressure control unit (241) for the ground surface operates to supply pressurized air to the slime storage space (220) through the external air pipe (242) and the internal air pipe (243) of the auger shaft (particularly the air exhaust pipe (243c) and the internal / external connection air pipe (243a)) to increase the pressure of the slime storage space (220).

[0130] At this time, the air intake pipe (243b) is prevented from flowing in the reverse direction by the air intake check valve (243b-1), and thus is substantially closed.

[0131] Meanwhile, when pressurized air is supplied to the slime storage space (220) through the internal air pipe (243) of the ogeochuk, the pressurized air is ejected from the air discharge hole (243c-2) formed at the lower end of the air discharge pipe (243c), and the pressurized air ejected in this way moves upward within the slime storage space (220) and passes through the slime, and in this process, the slime stored in the slime storage space (220) can be stirred.

[0132]

[0133] Hereinafter, a third embodiment of the present invention will be described.

[0134] FIG. 9 is a drawing showing a state in which slime outside an auger shaft is sucked into a slime storage space in a ground improvement stirring device according to a third embodiment of the present invention, and FIG. 10 is a drawing showing a state in which slime in a slime storage space is discharged to the lower part of an auger shaft in the ground improvement stirring device of FIG. 9.

[0135] In the following, only the differences between this embodiment and the first embodiment will be described, and the remainder will be replaced with a description of the first embodiment.

[0136] Figures 9 and 10 are drawings corresponding to Figures 5 and 6 of the first embodiment.

[0137] In this embodiment, the space pressure change means (240) for storing slime includes a piston (245), a piston rod (246), and a driving source (247).

[0138] The piston (245) functions as the upper cover of the slime storage space (220) and can move up and down along the inner surface of the auger shaft (110).

[0139] That is, the inner surface of the ogre shaft (110) functions as a cylinder for the vertical movement of the piston (245).

[0140] In addition, the shape of the slime storage space (220) is defined as a portion where the lower end is connected to the slime outlet (230), the upper end is defined by a piston (245), and the wall is defined as the inner surface of the auger shaft (110).

[0141] The piston rod (246) is connected at its lower end to the piston (245), and the piston rod (246) is driven up and down by a driving source (247) fixedly connected inside the auger shaft (110).

[0142] That is, the piston (245) and the piston rod (246) move up and down reciprocally by a driving source (247) using pneumatic or hydraulic pressure, thereby changing the volume of the slime storage space (220).

[0143] In addition, as the volume of the slime storage space (220) changes in accordance with the up-and-down reciprocating movement of the piston (245), the pressure of the slime storage space (220) changes, thereby allowing the slime outside the auger shaft (110) to be sucked into the slime storage space (220) or the slime in the slime storage space (220) to be discharged to the lower portion of the auger shaft (110).

[0144] That is, as shown in FIG. 9, when the piston (245) moves upward, the volume of the slime storage space (220) expands and the pressure of the slime storage space (220) decreases, thereby allowing the slime to be sucked into the slime storage space (220) from the outside of the auger shaft (110) through the slime inlet passage (210).

[0145] Conversely, when the piston (245) moves downward as shown in FIG. 10, the volume of the slime storage space (220) contracts, increasing the pressure of the slime storage space (220), thereby allowing the slime in the slime storage space (220) to be discharged to the lower part of the auger shaft (110) through the slime discharge path (230).

[0146]

[0147] The foregoing description of the present invention is for illustrative purposes only, and those skilled in the art will readily appreciate that the present invention can be readily modified into other specific forms without altering the technical spirit or essential characteristics of the present invention. Therefore, it should be understood that the embodiments described above are illustrative in all respects and not restrictive. For example, each component described as a single entity may be implemented in a distributed manner, and similarly, components described as distributed may be implemented in a combined manner.

[0148] The scope of the present invention is indicated by the claims described below rather than the detailed description above, and all changes or modifications derived from the meaning and scope of the claims and their equivalent concepts should be interpreted as being included in the scope of the present invention.

[0149] The present invention relates to an eco-friendly slime-reducing ground improvement stirring device and ground improvement method that can be used for ground improvement.

Claims

1. In a ground improvement stirring device, the device comprises at least one auger shaft that is rotatable for excavating and improving the ground, an excavation means provided on the outer surface of the auger shaft, a stirring means provided on the outer surface of the auger shaft, and an improvement material supply path provided on the auger shaft so that improvement material is supplied along the axial direction of the auger shaft and ejected from the lower portion of the auger shaft: At least one of the above-mentioned axles is provided with a slime suction and discharge means for suctioning slime moving upward within the excavated ground and discharging it toward the ground from the lower portion of the axle; The above slime suction and discharge means, A slime storage space in the form of an empty space extending vertically inside the above-mentioned ogre shaft, A slime inlet passage provided in the upper and lower middle portion of the above-mentioned axle to connect the outside of the above-mentioned axle and the above-mentioned slime storage space, A slime suction check valve provided in the above slime inlet passage to allow the slime to flow only in the direction of flowing into the slime storage space, A slime outlet extending from the top to the bottom, connected to the slime storage space provided inside the above-mentioned ogre shaft, A slime discharge check valve provided in the above slime discharge channel and allowing the flow of slime only in the direction in which the slime is discharged through the above slime discharge channel, A slime storage space pressure changing means is included to change the pressure of the slime storage space so that slime is sucked into the slime storage space from the outside of the auger shaft through the slime inlet passage or the slime in the slime storage space is discharged to the lower part of the auger shaft through the slime outlet passage; A ground improvement stirring device characterized by:

2. In paragraph 1, A ground improvement stirring device characterized in that the above-mentioned auger shaft is in the form of a hollow pipe extending vertically, and the slime storage space uses the inner surface of the auger shaft as a wall.

3. In paragraph 2, A ground improvement stirring device characterized in that the above slime storage space pressure changing means includes an air depressurization and pressurization means for discharging air inside the slime storage space to the outside or supplying pressurized air to the slime storage space.

4. In paragraph 3, A ground improvement stirring device characterized in that the air pressure reducing and pressurizing means includes a ground surface air pressure control unit installed on the ground surface, and an air pipe for the outside of the auger shaft connecting the ground surface air pressure control unit and the inside of the auger shaft.

5. In paragraph 4: An air pipe for internal use of the auger shaft is provided inside the auger shaft to be connected to an air pipe for external use of the auger shaft; The air pipe inside the above-mentioned ogre shaft is, An internal / external connection air pipe for connecting to the external air pipe of the above-mentioned ogeo-axis, An air intake pipe connected to the internal / external connection air pipe to intake air from the upper part of the space for storing the slime, An air intake check valve provided in the above air intake pipe to allow air to flow only in the direction in which the air flows into the air pipe inside the auger shaft, An air exhaust pipe connected to the internal / external connection air pipe to exhaust air to the inner lower part of the above slime storage space, Including an air discharge check valve provided in the air discharge pipe to allow air to flow only in the direction of being discharged to the slime storage space through the air discharge pipe; A ground improvement stirring device characterized by:

6. In paragraph 2, A ground improvement stirring device characterized in that the above slime storage space pressure changing means comprises a piston that can move up and down along the inside of the auger shaft as an upper cover of the slime storage space, a piston rod whose lower end is connected to the piston, and a driving source that drives the piston rod.

7. A ground improvement method characterized by improving the ground using a ground improvement stirring device according to any one of clauses 1 to 6.

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