KR102029424B1 - Soil agitating device for weak ground - Google Patents

Abstract

The present invention relates to an in situ ground stirring apparatus for soft ground, which is capable of simultaneously drilling the soft ground surface and stirring the lower soft ground, and is coupled to a drive shaft of a perforator head or a rod installed on the drive shaft. The main pipe is provided with a main flow path that can flow, and is installed in the main pipe, extending radially with respect to the main pipe, the communication space communicated to the main flow path so that the solidified material flows therein A perforated layer is provided in the agitated unit and the rod front end, which includes a plurality of agitator blades formed on the outer circumferential surface and has a plurality of agitating wings formed thereon for discharging the solidified material contained in the communication space to the outside. Perforation bits are further mounted.
The in situ ground stirring apparatus for soft ground, which enables the drilling of the soft ground surface layer and the stirring of the lower soft ground at the same time, injects the solidified material into the perforated hole in the ground of the soft ground by the stirring unit. Since the solidified material is agitated, the soil and solidified material are easily mixed, and there is an advantage of improving the strength of the structure formed by the solidified material by preventing the generation of an air filling part in which air is filled in the solidified material.
In addition, the in situ ground agitating device for soft ground, which is capable of puncturing the solid soft surface surface and stirring the lower soft ground at the same time, is difficult to mount the construction equipment on the soft ground surface. Even when the surface layer is treated to secure the bearing capacity such as aggregate, it is possible to continuously solidify by stirring the soft ground under the treated part while drilling the treated part.

Description

In situ agitating device for weak ground, which allows drilling of solid soft surface surface and agitation of lower soft ground at the same time {Soil agitating device for weak ground}

The present invention relates to an in situ ground stirrer for soft ground, which enables the drilling of the soft ground surface and agitation of the lower soft ground at the same time, and more particularly, when the surface of the soft ground is soft, the equipment cannot be mounted. The present invention relates to a simultaneous progression of drilling and freezing of the ground and stirring with ground while stirring the surface layer and mounting the equipment, and then spraying the water and solidified material at a certain ratio on the bottom of the freezing site.

In general, for the construction of geothermal power generation, groundwater development or reservoirs, dams, river banks, and the like will be perforated to the ground. However, in the case of the soft ground such as the groundwater flow or viscous soil, sandstone in the process of performing the drilling, if the rod is drawn from the drilled hole after the drilling is performed, the perforated area collapses There is a problem. In particular, the collapse of the above-mentioned drilling site is severe when performing the drilling work for the maintenance of reservoirs, power generation dams, such as rural ground works.

In particular, in the process of drilling, there are occasions in which the inner part of the heart is recessed and the republication is closed. Therefore, the necessity of the technology of grouting between the in casing and the heart wall while maintaining the in casing inside the heart is emerging.

On the other hand, the ground injection method in consideration of this point is a method of increasing the strength of the ground by injecting and solidifying a coagulant such as chemical liquid and cement milk into the ground, and the ultra-high pressure injection filling method (SIG method), high pressure filling method (SRC method), Ultra high pressure spray stirring method (RJP method), high pressure spray stirring method (JSP method) and the like are widely used.

The above-mentioned SIG method rotates while spraying jets of ultra-high pressure (P = 400-600㎏ / ㎠) to discharge the soft soil, and a large-diameter cylindrical solidified body having a diameter (Φ = 1200-2000㎜) in the discharged space. As a composition method, it is mainly used for a soil layer, a sand layer, a gravel layer, a soft rock layer, and a viscous soil layer with N <10.

As described above, the SIG method can solve the problems of the surrounding ground uplift due to the injection of high pressure injection, which is a disadvantage of the conventional jet grouting, and the weakening of the ground due to the spout, and the rotational drawing speed of the multi-pipe rod can be adjusted. It is easy to adjust the size, and it discharges the soft soil dust of limestone cavity or crushing zone with high pressure water, and injects cement milk into the discharged space to form the reinforcement ground with excellent ground strength and durability. In particular, the substitution method has a significant advantage after the reinforcement strength increase.

However, the SIG method as described above has a disadvantage in that when the large cavities are interconnected, the grout injection amount is excessively generated, the cement shrinks as the cement hardens, and the ground and the hardening material do not come into close contact with each other.

On the other hand, the SRC method is a method of cutting and relaxing the ground using ultra-high pressure water (0 ~ 800㎏ / ㎠) accompanied by compressed air during drilling, and is a method of mixing the discharged cutting soil with solidified material and reused as injection material .

As described above, the SRC method needs to replenish the injection material when the amount of discharged soil is small, and the equipment is complicated because the slime is reprocessed and injected into the soil. This is impossible. In addition, when filling the grout injection material when the contact with the groundwater material separation phenomenon occurs and there is a disadvantage that can not be substituted into the gravel and sandy soil inside the cavity.

On the other hand, the RJP method described above is rotated while spraying jets of ultra-high pressure (P = 400-600 kg / cm 2) and stirred with the soft soil of the ground, which is a large diameter columnar solidified body having a diameter (Φ = 1200-2000 mm). As a method of forming a metal, it is mainly used in a soil layer, a sand layer, and a viscous soil layer having N <10.

As described above, the RJP method has a lower strength (maximum strength = 60 kg / cm 2) and economical efficiency than the SIG method, and when large cavities are interconnected, excessive grout injection occurs and cement hardens. There is a disadvantage in that the cavity is generated again by groundwater because it is not closely contacted with the base and the hardening material.

On the other hand, the JSP method is a method of forming a cylindrical solidified body having a diameter (Φ = 800 ~ 1000㎜) in the ground by rotating while spraying a jet of high pressure (P = 200㎏ / ㎠), mainly earth and sand Layer, a viscous soil layer with N <10.

However, the JSP method as described above is difficult to quality control according to the development of the required strength because the improved body is a kind of soil cement formed by the soil and cement milk, the strength of the improved body (maximum strength = 40㎏ / ㎠) compared to the SIG method And disadvantages of low economic efficiency.

Conventional ground injection methods as described above are to inject a solid material such as cement in the ground using the injection method suitable for the soil conditions in the state of drilling the ground to a certain diameter and depth using a drilling equipment in the field It is a method, and since a separate stirring device for stirring the solidified material is not provided, there is a problem in that the strength of the hardened solidified material is lowered when a space filled with air is formed in the solidified material.

In addition, in the case of the existing stirring equipment, the mixture is not injected from the stirring blade is mixed with water and solidified material, the mixture is injected into the drilling hole from the outside of the drilling hole, the stirring efficiency is lowered. In addition, the stirring blade is fixed to the rod, when the soil is attached to the stirring blade when stirring, water and the solid mixture is not mixed with the ground, and as it enters the ground, it is difficult to maintain the verticality of the rod and the stirring blade.

The ultra high pressure injection filling method (SIG method), high pressure filling method (SRC method), ultra high pressure injection stirring method (RJP method), high pressure injection stirring method (JSP method), etc. Since the equipment should be able to be mounted, if the surface is soft and difficult to mount the equipment, sand, gravel, earth and sand are laid in the surface layer to secure the supporting capacity for equipment installation. In the process of laying and installing and removing after construction, the construction is complicated and additional construction costs are added in addition to the direct construction cost.

Republic of Korea Patent No. 0656142: Ground excavation and grout injection device and ground grouting method using the same

The present invention was created in order to solve the above problems, when the surface of the ground drilling in the soft ground is weak, if the equipment can not be mounted on the soft surface of the first stirring and mounting the equipment after drilling and solidified It is an object of the present invention to provide a device for simultaneously drilling and solidifying the ground and stirring while spraying water and solidified material mixed at a predetermined ratio in the lower portion of the surface layer.

In order to achieve the above object, the in situ ground stirring apparatus for soft ground which is capable of simultaneously drilling the soft ground surface and stirring the lower soft ground according to the present invention is coupled to a drive shaft installed in the head of the perforator, or a rod installed on the drive shaft. The main pipe is provided with a main flow path through which the solidified material flows, and is installed in the main pipe, and extends radially based on the main pipe, so that the solidified material flows into the main flow path. It is provided with a communication space communicating, the outer peripheral surface is provided with a stirring unit including a plurality of stirring blades formed with a discharge port for discharging the solidified material accommodated in the communication space to the outside.

It is preferable to have a drilling bit mounted on the tip of the rod to drill the freezing portion of the surface layer.

The stirring blade is preferably formed with the outlet port in the rear end relative to the rotation direction of the main tube.

The stirring blade is installed in the main tube, extending in a direction away from the main tube, the communication space is provided inside, inclined so that the front end portion is located below the rear end relative to the rotation direction of the main tube. The outlet is formed at a rear end thereof.

On the other hand, the soft ground grouting apparatus according to the present invention is installed so as to rotate relative to the main pipe, the support unit for supporting the main pipe so as to maintain the upright state of the main pipe with respect to the perforated ground Equipped.

The support unit includes a support body installed to be rotatable relative to the main pipe, and a plurality of support wings extending radially from the main pipe to the support body.

It is preferable that the main pipe is provided with a bit capable of drilling underground.

The main pipe is equipped with a bit for drilling the ground at the bottom, if it is impossible to mount the equipment on the soft ground to mount the equipment in the state of fixing the surface layer first, puncture the consolidated area and the soft ground under the freezing ground Stirring allows subsequent stirring.

According to the characteristics of the ground, it is possible to variably control the angle, number and length of the plurality of stirring blades extending radially to increase the stirring efficiency.

According to the characteristics of the ground, the number and position of the discharge openings can be variably adjusted to control the amount and pressure of the solidified material discharged through a plurality of radially extending stirring blades to increase the stirring efficiency.

Bits that can be drilled in the ground, if the equipment is difficult to mount, it is possible to puncture the surface of the solidified to secure equipment support.

Bits that can drill underground will be able to perforate the surface layer of aggregates, such as sand or gravel, in order to secure equipment support when equipment is difficult to mount.

In order to increase the stirring efficiency according to the characteristics of the ground, a bit capable of perforating the ground prevents the stirring blade from being broken due to the presence of a rigid layer in the process of injecting a plurality of radially extending stirring blades while stirring the ground. For this purpose, the rigid layer can be drilled and accessed.

The in situ ground stirring apparatus for soft ground, which enables the drilling of the soft ground surface layer and the stirring of the lower soft ground at the same time, injects the solidified material into the perforated hole in the ground of the soft ground by the stirring unit. Since the solidified material is agitated, the soil and solidified material are easily mixed, and there is an advantage of improving the strength of the structure formed by the solidified material by preventing the generation of an air filling part in which air is filled in the solidified material.

In addition, the present invention maintains a constant verticality of the main pipe with respect to the ground even if drawn into the ground by a support unit coupled to rotate relative to the rod.

1 is a view of a perforator equipped with a home-based ground stirring apparatus for soft ground, which enables simultaneous drilling of the soft ground surface layer and stirring of the lower soft ground of the present invention,
Figure 2 is a perspective view of the in situ ground stirring apparatus for the soft ground at the same time it is possible to stir the perforated and the lower soft ground of the consolidated soft ground surface layer of the present invention,
3 is a partial cutaway perspective view of an in situ ground stirring apparatus for soft ground, which enables simultaneous drilling of a soft ground surface layer and stirring of the lower soft ground of the present invention;
Figure 4 is a cross-sectional view of the in situ ground stirring apparatus for the soft ground at the same time capable of drilling and stirring the soft ground surface of the consolidated soft ground surface layer of the present invention.

Hereinafter, with reference to the accompanying drawings will be described in more detail the in situ ground stirring apparatus 100 for the soft ground at the same time it is possible to puncture the solid soft surface surface layer and the stirring of the lower soft ground in accordance with a preferred embodiment of the present invention.

1 to 4 illustrate the in situ ground stirring apparatus 100 for soft ground, which enables simultaneous drilling of the soft ground surface layer and stirring of the lower soft ground according to the present invention.

Referring to the drawings, the in situ ground stirrer 100 for soft ground, which is capable of puncturing the solid soft surface surface and stirring the lower soft ground at the same time, repairs and constructs dams, reservoirs, river banks, underground pipes, etc. It is used for the development, the following soft ground reinforcement, and the drilling work to form the underground hole. The in situ ground stirring apparatus 100 for the soft ground, which enables the drilling of the solid soft ground surface and the stirring of the lower soft ground at the same time, is driven by the drive shaft 13 of the head portion 12 that is elevated along the lead of the perforator 10. It is rotated by the actuator and coupled to the drive shaft 13 having a hollow (not shown) or coupled to the rod 11 installed on the drive shaft 13, the main flow path 111 is provided with a solid material can flow therein Main pipe 110, a plurality of stirring unit 120 is installed in the main pipe 110, and is installed so as to rotate relative to the main pipe 110, the main pipe 110 with respect to the perforated ground ) Is provided with a support unit 130 for supporting the main tube 110 to maintain the upright state.

The main tube 110 extends in the vertical direction and is formed in a cylindrical shape having a predetermined outer diameter. The main pipe 110 has a main flow path 111 in which solidified materials flow therein, and extends in a vertical direction, and the main flow path 111 is formed so that an upper surface thereof is opened.

In addition, the main tube 110 is preferably formed with a female thread on the inner side surface to be screwed to the drive shaft 13 or the rod 11 connected to the drive shaft 13 of the head portion 12. At this time, the main pipe 110 is provided with a bit 112 that can be perforated underground. The bit 112 includes a bit body 113 protruding downward with respect to the lower end of the main tube 110, and three blades 114 arranged radially on the outer circumferential surface of the bit body 113. The bit body 113 is preferably formed in a conical shape in which the outer diameter decreases downward.

On the other hand, although not shown in the drawings, the main pipe 110 may be formed with a connecting portion so that the other rod 11 can be connected to the bottom. The connecting portion extends downward of the main pipe 110, the outer diameter decreases toward the lower side, the male thread can be formed on the outer circumferential surface to be screwed to the other rod (11).

The stirring unit 120 extends radially with respect to the main pipe 110 and has a communication space 122 communicating with the main flow passage 111 so that the solid material flows therein, and is provided on an outer circumferential surface thereof. It is provided with three stirring blades 121 formed with a discharge port 123 for discharging the solidified material accommodated in the communication space 122 to the outside.

The stirring blade 121 is installed in the main tube 110, extends in a direction away from the main tube 110, the communication space 122 is provided therein, the rotation direction of the main tube The front end is inclined so as to be positioned below the rear end, and the outlet 123 is formed at the rear end.

Since the stirring blade 121 is formed to be inclined, a part of the rehabilitation material in front of the main pipe 110 is rotated upward to improve the stirring efficiency of the refining material. In addition, since the refiner is injected to the rear of the stirring blade 121 through the outlet 123, the driving force generated by the injection of the refiner can be generated, the main tube 110 can be rotated more easily.

Meanwhile, in the illustrated example, a structure in which three stirring blades 121 are provided has been described, but the stirring blades 121 may not be limited thereto but may be provided in plural numbers according to the size of holes to be drilled in the ground.

Stirring unit 120 is configured as described above is preferably a plurality of spaced apart from each other along the vertical direction of the main pipe (110).

The support unit 130 is installed in the main tube 110 between the stirring unit 120, the support body 131 is installed to be relatively rotatable to the main tube 110, and the support body 131 On, the main pipe 110 is provided with two support wings 132 extending radially.

The support body 131 is formed at the center portion is inserted into the main tube 110 is inserted through. Although not shown in the drawing, the support body 131 is supported by the main pipe 110 so as to be relatively rotatable by a bearing installed between the main pipe 110.

The support wings 132 are respectively fixed to the outer circumferential surface of the support body 131, the two of which are opposed to each other around the insertion hole. The support wing 132 extends away from the outer circumferential surface of the support body 131. The support wing 132 supports the main tube 110 so that the main tube 110 is maintained in an upright position with respect to the hole in contact with the inner surface of the hole perforated in the ground.

Referring to the operation of the in situ ground stirring apparatus 100 for the soft ground at the same time it is possible to stir the perforated soft ground surface layer and the lower soft ground stirring according to the present invention configured as described above.

As shown in FIG. 1, in order to perform a drilling operation for reinforcing the ground for repairing dams or rivers and reservoirs, the head part 12 of the drilling machine 10 includes a main pipe 110 having a bit installed at a lower end thereof. The upper part of the main pipe 110 is connected to the drive shaft 13 or to the lower part of the rod connected to the drive shaft 13 of the head part 12.

When the assembly of the in situ ground stirring apparatus 100 for soft ground, which enables the drilling of the soft ground surface layer and the stirring of the lower soft ground at the same time as described above, is completed, the drilling operation is performed by using the same.

The worker rotates the drive shaft 13 of the perforator 10 to drill the ground through the bit installed in the lower portion of the main pipe (110). At this time, the solidified material is injected into the main flow path 111 of the main pipe 110. As the solidified material, a coagulant such as chemical liquid or cement milk may be used.

 The solidified material flowing through the main flow passage 111 of the main pipe 110 flows into the communication space 122 of the stirring blade 121, and is holed in the ground through the outlet 123 of the stirring blade 121. Discharged. At this time, the redistribution material discharged into the hole by the stirring blade 121 that rotates together with the main pipe 110 is stirred.

In addition, the in-situ ground stirring apparatus for soft ground, which enables the drilling of the soft ground surface layer and the stirring of the lower soft ground according to the present invention, is equipped on the soft ground through a bit capable of drilling the ground at the bottom of the main tube of the soft ground. If it is not possible to mount the surface in the first solidified state in the equipment to mount the perforated area and then the soft ground under the solidified ground can be stirred by subsequent stirring.

In addition, according to the characteristics of the ground, it is possible to variably adjust the angle, number and length of the plurality of stirring blades extending radially to increase the stirring efficiency.

In addition, according to the characteristics of the ground to adjust the number and position of the discharge port to adjust the amount and pressure of the solidified material discharged through a plurality of radially extending stirring blades to increase the stirring efficiency.

And, if the bit that can be bored underground is difficult to mount the equipment, it is possible to puncture the surface layer solidified in order to secure the equipment holding capacity.

In addition, the bit that can be drilled in the ground can be perforated the surface layer in the aggregate, such as sand or gravel in order to secure equipment holding capacity when the equipment is difficult to mount.

In addition, the bit that can be bored in the ground is a process in which a plurality of radially extending stirring blades in the process of entering the ground while stirring the ground in order to increase the stirring efficiency according to the characteristics of the ground, the presence of a rigid layer is broken that In order to prevent it, the rigid layer can be drilled in and out.

The in situ ground stirring apparatus 100 for soft ground, which enables the drilling of the soft ground surface and the stirring of the lower soft ground at the same time, according to the present invention configured as described above, has a bit body 113 at the top of the solid ground for mounting the equipment. After drilling the solidified surface layer using a), the solidified material is injected into the hole drilled when the underground hole is drilled in the soft ground by the stirring unit 120, and the solidified material is stirred, so that the soil and the solidified material are easily There is an advantage of improving the strength of the structure formed by the solidified material by preventing the generation of the air filled portion is mixed, the air filled in the solidified material.

Although the present invention has been described with reference to the embodiments shown in the drawings, this is merely exemplary and will be understood by those skilled in the art that various modifications and equivalent embodiments are possible.

Therefore, the true scope of protection of the present invention should be defined only by the appended claims.

10: perforator
11: load
12: head part
13: drive shaft
100: In situ ground agitating device for soft ground, which enables drilling of solid soft surface surface and agitation of lower soft ground simultaneously
110: main building
111: Maine Euro
112: bits
113: beat body
114: blade
120: stirring unit
121: stirring blade
122: communication space
123: outlet
130: support unit
131: support body
132: support wing

Claims (12)

It is coupled to the drive shaft of the perforator head portion or a rod installed on the drive shaft, and a main flow path through which solidified material flows is provided therein, and an internal thread is formed on the inner side of the screw to be coupled to the drive shaft or the rod connected to the drive shaft of the head portion. A lower part of the main tube having a connection part connected to the other rod;
As installed in the main pipe, a communication space extending radially with respect to the main pipe, the communication space communicating with the main flow path is provided so that the solidified material flows therein, and the height accommodated in the communication space on an outer circumferential surface thereof. And a stirring unit including a plurality of stirring blades formed with a discharge port for discharging the fire to the outside.
The connecting portion extends downward of the main pipe, the outer diameter decreases toward the lower side, and a male thread is formed on the outer circumferential surface to be screwed to another rod.
The stirring blade extends in a direction away from the main tube, the front end is formed to be inclined so as to be located below the rear end relative to the rotation direction of the main tube, the outlet is formed in the rear end,
The main pipe is equipped with a bit that can be perforated underground at the bottom, if the equipment is not mounted on the soft ground to mount the equipment in the state of fixing the surface first to solidify the hole, and solidified in the perforated hole At the same time while stirring the soft ground at the bottom of the solidified ground, followed by stirring,
The bit prevents the stirring blades from being damaged due to the presence of a rigid layer in the process of incorporating a plurality of stirring blades extending radially to agitate the ground in order to increase the stirring efficiency according to the characteristics of perforation and the ground of the solidified surface layer. In order to perforate the rigid layer to form a
The stirring unit is provided with a plurality of spaced apart along the vertical direction of the main tube,
And a support unit installed between the stirring units so as to be relatively rotatable with respect to the main tube and supporting the main tube to maintain the upright state of the main tube.
The support unit is a perforated and lower surface of the consolidated soft ground surface layer characterized in that it comprises a support body which is installed to be relatively rotatable to the main tube, and a support wing extending radially with respect to the main tube to the support body. In situ ground stirrer for soft ground which can be stirred at the same time.

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