KR100770647B1 - A ground improvement apparatus and the method thereof - Google Patents

Abstract

A separation type ground piling device and a method of reinforcing a ground using the separation type auger cast piling device are provided to adjust the width of exaction rods depending on the ground layer by individually installing excavation rods to movable driving units fixed on moving blocks installed to guide rods in an auger machine, and to inject compressed air, mortar and accelerator agent selectively into excavated ground by installing inner and outer pipes in each of the excavation rods. A separation type ground piling device has an auger machine(10) vertically lifted or lowered on a crawler crane. Driving units(40) comprises gear boxes(41), decelerators(42), and motors(43) are installed in the auger machine. Excavation rods(20) are individually installed to each of the driving units. Each of the excavation rods have air injection pipes at the centers encased in inner pipes, and mortar or accelerator agent injecting pipes on outer periphery of the inner pipes, and outer pipes encasing all the pipes. Guide bars(12) are installed horizontally in the auger machine. The plural driving units are individually installed to the guide bars. Moving blocks(13) are installed to the guide bars, and the driving units are fixed to the moving blocks. First swivels(50) are installed on upper parts of the gear boxes of driving units to inject the mortar through the center section of driving shafts, and second swivels(51) are installed on upper ends of the excavating rods for injecting the compressed air and the accelerator agent. A method of reinforcing the ground by using the separation type piling device comprises the steps of: investigating the geological state of the ground to be excavated; selecting and adjusting the width of excavation rods based on the findings from the investigation; excavating to the preset depth by adjusting the width of the excavation rods, and by operating an air hammer; filling the mortar and the accelerator into the excavated space through the pipes; and slowly pulling out the excavation rods after the injected mortar and the accelerator agent are mixed with the excavated soil.

Description

Ground separation device for driving separation and ground improvement method using the device

1 is an overall installation state of the ground excavation device according to the present invention.

Figure 2 is a side cross-sectional view showing the installation state of the auger machine in the present invention.

Figure 3 is a front sectional view showing the installation state of the auger machine and the excavating rod in the present invention.

4 to 6 are a plan sectional view and a front sectional view showing a gap adjustment state of the drive unit in the auger machine according to the present invention.

Figure 7 is a plan sectional view showing an installation state of the excavation rod according to the present invention.

Figure 8 is a cross-sectional view showing the interval adjustment state of the excavation rod in the present invention.

9 is a cross-sectional view of the installation state of the shovel injecting the mortar and the fastener in the present invention.

10 is a cross-sectional view showing another installation state of the shovel in the present invention.

11 is a cross-sectional view showing an installation state of the connection joint in the present invention.

12 is an exploded cross-sectional view showing another embodiment of the connection joint in the present invention.

Figure 13 is an exploded cross-sectional view showing an excavation rod and the air hammer in the present invention.

14 is a cross-sectional view of the installation state of the auger machine showing another embodiment of the present invention.

15 is a working view showing an excavation process in the present invention.

16 is a working view showing another embodiment of the excavation process in the present invention.

Figure 17 is an overall installation state showing another embodiment of the ground excavation device in the present invention.

Figure 18 is a side cross-sectional view showing another installation state of the auger machine in the present invention.

19 is a cross-sectional view showing another installation state of the auger machine in the present invention.

Figure 20 is a cross-sectional view showing another installation state of the excavation rod in the present invention.

21 and 22 is a working view showing another embodiment of the excavation process in the present invention.

Figure 23 is a process chart showing the working process of the ground improvement method according to the present invention.

{Description of symbols for main parts of the drawing}

1: crawler crane 2: reader

3: rotator 4: stay

5: wire cable 10: auger machine

11: body 12: guide rod

13: transfer block 20: drilling rod

21: inner tube 22: outer tube

23: screw 30: rod holder

40: drive part 41: gearbox

42: reducer 43: motor

50: first chevel 51: second chevel

53: injection tube 60: connection joint

The present invention relates to a ground improvement apparatus and an improved construction method for reinforcing a ground layer and a vertical order layer, such as a coast, a harbor, or an unsanitary landfill, and more specifically, a driving part of an excavation rod that excavates the ground is an auger machine. Since it is separately installed and separately separated, it is possible to selectively adjust the excavation interval according to the ground layer, while selectively injecting compressed air, mortar (hardener) and a fastener into the excavating rod according to the soft ground or rock layer. Excavation work is made quickly and easily by operation, and it is related with a ground improvement device and an improved construction method that can prevent construction work while increasing workability and reduce construction cost.

Generally, the ground layer of coastal, harbor or unsanitary landfill area is composed of sandstone, viscous soil, sandy soil, organic soil, etc., so it is weak to load due to its topographical characteristics. Vertical water barriers are constructed in the ground in areas that need to be improved and reinforced, and that require orders such as rivers, reservoirs, dikes, and landfills.

Recently, the ground improvement device used to improve the soft ground or construct the vertical water barrier in the ground is usually excavated to the desired depth to excavate the ground that needs to be improved by spraying mortar (hardener) and a fastener such as ground soil and mortar ( By stirring the solidifying agent) and the fastener, the ground layer is improved or a vertical order wall is constructed in the ground.

The existing ground improvement device is vertically driven by a rotator 3 and a stay 4 of a crawler crane 1 that runs independently on the ground, as shown in FIG. 1 in the drawing. The auger machine (Auger Machine) 10 is installed so as to elevate to the leader (2) fixedly installed on the top, the multi-stage assembly is installed in the lower portion of the auger machine (10) while the excavation rod (20) is installed Excavation rod 20 is inserted into the rod holder 30 is guided up and down in the process, the auger machine 10 is a wire cable 5 drawn from the crawler crane (1) is mounted on the upper portion of the main body 11 It is wound around the pulley 6 and installed so as to elevate from the leader 2.

The excavation rod is assembled in the lower part of the auger machine to excavate the ground is composed of 1 to 3 axes to perform excavation work at the same time, the drive unit is installed in the auger machine to rotate the excavation rod by a gear box, a reducer and a hydraulic motor It is configured, and the excavation rod consisting of a three-axis in the lower portion of the gear box is mounted to receive the rotational force from the drive to perform the excavation work.

When the excavating rod is configured in three axes in the conventional ground improvement device, compressed air is injected into the excavating rod positioned in the middle to operate the air hammer, and the mortar (hardener) and the fastener are injected into the excavating rod positioned at both sides thereof. After the excavation operation is performed by the operation of the screw and the air hammer mounted on the excavation rod, the mortar (hardener) and the fastener are injected and the stirring operation is completed to complete the work process.

In the existing ground improvement device, the auger machine is configured to rotate the excavating rod consisting of three axes at the same time in the gearbox, so that the interval of the excavating rod is fixed, so the interval of the excavating rod is changed according to the geology in the excavation process. As it cannot be selectively transformed, workability is inferior, and since the compressed air, mortar (hardener), and fastener cannot be injected together in each excavating rod, the air hammer cannot be individually mounted on the excavating rod. When a rock layer occurs, workability is deteriorated and work processes are delayed.

In other words, when the soil is weak in the soil improvement section, the excavation process is smoothly made, so the gap between the excavation rods is widened, and there is no problem in excavation work, ground reinforcement, and construction of the vertical order wall. There was a problem that can not shorten the work process can not be modified.

The present invention has been made in order to solve the problems according to the prior art of the conventional ground improvement device as described above, the excavation work is made quickly and easily by the operation of the air hammer as well as to improve the workability to prevent poor construction and the construction cost The driving part of the excavating rod to excavate the ground is installed separately in the auger machine according to the excavating rod to selectively control the excavation interval, and the compressed air and the mortar (solidification) and the excavation rod according to the soft ground or rock layer. The main object of the present invention is to provide a ground improvement device and an improved construction method capable of selectively injecting a fastener.

Features according to an embodiment of the present invention for achieving the desired object as described above;

An auger machine is installed so as to vertically climb the crawler crane, the auger machine is provided with a drive unit consisting of a gearbox, a reducer and a hydraulic motor, the ground improvement device equipped with an excavation rod for excavating the ground in the drive unit;

A guide rod installed horizontally inside the auger machine; A driving unit selectively installed to be transportable to the guide rod, and configured to be separated by being composed of a gear box, a reducer, and a motor; It is characterized in that the excavation rod is installed separately mounted to the drive unit is composed of the inner tube and the outer tube is installed with an injection tube for injection of compressed air and mortar (hardener) and a fastener.

Referring to Figures 1 to 23 shown in the drawings the configuration according to a preferred embodiment of the present invention in more detail as follows.

First of all, in the embodiment of the present invention, the main part of the excavation rod for excavating the ground is separately installed and separately installed in the auger machine, so that the excavation interval is selectively adjusted according to the ground layer, and the excavation rod is made according to the soft ground or rock layer. By selectively injecting compressed air, mortar (hardener) and a fastener, the operation of the air hammer is not only to make the excavation work quick and easy, but also to increase the workability to prevent poor construction and reduce the construction cost.

Next, looking at the main configuration of the ground improvement device according to an embodiment of the present invention, the guide rod 12 installed horizontally inside the auger machine (10) which is installed to ascend and rise vertically to the crawler crane (1); A plurality of driving units 40 are installed to be selectively transported to the guide rod 12 in the auger machine 10 and composed of a gear box 41, a reduction gear 42, and a motor 43 so as to be separately separated. ; The excavation rod 20 is installed separately to the drive unit 40 is composed of the inner tube 21 and the outer tube 22 is installed with an injection tube 53 for injecting compressed air, mortar (hardener) and a fastener It consists of.

The auger machine 10 is installed to ascend and rise vertically to the leader 2 of the crawler crane 1, the guide rod horizontally to be disposed in the transverse direction inside the main body 11 of the auger machine (10) 12 is provided, where the guide rod 12 is preferably horizontally disposed in the front and rear in the main body 11 is attached to be fixed to both inner surfaces of the main body (11).

In the present invention, the drive unit 40 installed inside the main body 11 of the auger machine 10 to rotate the excavation rod 20 from the lower side into the gearbox 41, the reducer 42, and the motor 43. The gear box 41 is placed on the bottom surface of the main body 11 of the auger machine 10, and a speed reducer 42 and a motor 43 for providing power are installed. 43 may be applied to an electric motor or a hydraulic motor.

The drive unit 40 is installed in the main body 11 so as to be separately separated according to the number of the excavating rod 20, in the guide rod 12 horizontally located in the front and rear in the main body 11 The transfer block 13 installed to be transportable is attached to and fixed to the gear box 41 and the reducer 42 of the drive unit 40, so that the drive unit 40 rides on the guide rod 12 inside the main body 11. Guided to be transported from side to side, the gear box 41 of the drive unit 40 is fixed to the main body 11 by a fastening bolt 14 in accordance with the interval of the excavating rod (20).

Therefore, the driving unit 40 for rotating the excavation rod 20 in accordance with the interval of the excavation rod 20 in the state installed so as to be transported from side to side by the guide rod 12 and the transfer block 13 in the main body (11). As the fixing bolt 14 is fixed to the main body 11, the interval between the driving unit 40 and the excavating rod 20 may be selectively adjusted to selectively change the excavating interval in the excavating process.

On the other hand, the excavation rod (20) mounted and rotated by the coupling (41a) to the drive shaft of the gear box (41) in the drive unit (40) is provided with an inner tube (21) provided with an injection tube (53) into which compressed air is injected; The outer tube 22 is provided with an injection tube 53 into which a mortar (hardener) and a fastener are injected, and an outer tube 22 installed to surround the outer side of the inner tube 21, and an inner tube 21. The air hammer 24 is mounted inside the lower end of the lower part, and the screw 23 is mounted on the outer circumference of the outer tube 22.

In the embodiment of the present invention, the excavating rod 20 may be configured in three to five axes, where the screw 23 and the air hammer 24 in all three axes when the excavating rod 20 is configured in three axes. Mounting or mounting the air hammer 24 at the lower end of the drilling rod 20 located in the middle, and can be installed by mounting only the screw 23 to the drilling rod 20 located on both sides.

In the above, the excavation rod 20 is made of a predetermined length (2m ~ 6m) is connected to install in multiple stages according to the excavation depth as in the existing method, and as shown in Figure 7 to 13 in the mortar (hardener) and rapid The connection joint 60 is installed at the connection portion of the injection pipe 53 into which the payment is injected, thereby preventing the leakage of the mortar (hardener) and the fastener injected at high pressure.

The connecting joint 60 has fastening holes 62 formed at upper and lower ends of the injection pipes 53 adjacent to each other at the connection portions of the drilling rods 20 connected in multiple stages, and inner circumference of the fastening holes 62. A plurality of O-rings 63 are inserted into the adapters while the adapters 61 are fitted to be in close contact with the O-rings 63.

The adapter 61 has a locking jaw is formed in the middle portion to a predetermined length, and is fitted in close contact with the plurality of O-rings 63 in the fastening hole 62, and the mortar (hardener) injected at high pressure and Prevent leakage of quickeners.

Meanwhile, as another embodiment of the connection joint 60, a rubber material having excellent corrosion resistance and durability is coated on the outer periphery of the adapter 61 formed to a predetermined length as shown in FIG. 12, and the adapter 61 is treated. Is fitted to be in close contact with the fastening hole 62 can be installed to maintain the airtightness.

In addition, compressed air is injected into the injection tube 53 installed at the center of the inner tube 21 to operate the air hammer 24 to easily excavate the rock layer, and between the inner tube 21 and the outer tube 22. The mortar (solidifying agent) and the fastener are injected into the installed injection tube 53, and the high pressure spraying the mortar (solidifying agent) and the fastening agent to the side part through the outlet port 53a mounted to the lower portion of the outer tube 22. As a result, the excavated space is further expanded while the soil and agitation efficiency are increased.

In the present invention, the compressed air, the mortar (hardener) and the fastener are supplied to the injection pipe 53 from the excavation rod 20 in a state of rotating through the first and second shoebels 50 and 51. The first shovel 50 is installed on the upper portion of the gearbox 41 to inject mortar (solidifying agent) through the center of the drive shaft, and the second shovel 51 of the coupling 41a and the excavating rod 20 It is installed between the injecting compressed air and the fastener through the injection hose (52).

In the second shoe bell 51 is a body is coupled to the lower end of the coupling (41a) and the upper end of the drilling rod 20, as shown in Figure 9, the compressed air and the mortar (hardener) and Injection holes 51a, 51b, and 51c into which payment is injected are formed, respectively, and an outer casing in which the injection hose 52 is mounted is rotatably installed in a state where the body and the airtight are maintained, and thus in the injection hose 52. Compressed air, a mortar (hardener), and a fastener are injected into the injection pipe 53 through the injection holes 51a, 51b, and 51c, and the second shovel is not injected according to the lipid of the soft ground. An injection hose 52 is installed so as to inject only compressed air at 51.

On the other hand, Figure 10 is another embodiment of the second shovel 51, the first shovel is formed in the inner center of the body is formed so that the injection hole 51a through which the mortar (solidifying agent) is injected vertically Compressed air may be injected instead of the mortar (solidifying agent) at 50, and the mortar (solidifying agent) is injected from the second shovel 51 to the injection tube 53 through the injection hose 52 and the injection hole 51c. It can be supplied, it is possible to add a plurality of injection hoses and injection holes in the second shoe bell 51 according to the working conditions.

In addition, FIG. 14 is an embodiment in which the driving unit 40 and the excavating rod 20 are arranged in a row of five axes or more in the present invention, and the driving unit 40 and the excavating rod 20 are arranged in a row. 11) It can be installed by coupling the transfer block 13 to both side guide rods 12 from the inside.

On the other hand, Figure 15 and Figure 16 shows the excavation process when constructing the vertical order wall in the ground, the excavation work by rotating the excavation rod 20 and then injecting the mortar (hardener) and the fastener to stir work After the completion of the first excavation process, the second excavation process is completed by the distance that the first excavation process is carried out to complete the excavation process, the third excavation between the first excavation process and the second excavation process The excavation process of the vertical order wall is carried out by carrying out the process.

The reason for carrying out the second excavation process separately after completing the first excavation process is that the mortar (hardener) and the fastener injected into the excavated space in the first excavation process are the excavation space of the second excavation process. In order to prevent the inflow, when the second excavation process is to be adjacent to the first excavation process, the excavation work of the second excavation process is performed, and the mortar (hardener) and the fastener injected into the first excavation process are 2 This is to prevent inadequate construction work by entering the excavation space of the primary excavation process and creating an empty space in the first excavation process.

In addition, FIGS. 17 to 20 are views in which the driving unit 40 and the drilling rod 20 are arranged in five or more axes in the main body 11 of the auger machine 10 in the present invention. The drive unit 40 and the excavating rod 20 are installed in the main body 11 in five or more axes, and the drive unit 40 and the excavating rod 20 are arranged in two rows in three axes and two axes, where 2 The driving unit 40 and the excavating rod 20 corresponding to the shaft can be installed in a small size, and the transfer block 13 is coupled to the guide rod 12 so as to be symmetrically disposed between the inside of the main body 11. Can be installed to be transported.

The advantage that the drive unit 40 and the excavating rod 20 in five or more axes in the above configuration is to further strengthen the reinforcement cross section according to the geology of the ground layer, and the drive unit 40 and the excavating rod 20 are arranged in a line. When the drive unit 40 and the excavating rod 20 are arranged in a double row than the constructed reinforcing cross section, the area of the reinforcing cross section can be widened to further strengthen the soft ground.

On the other hand, for the purpose of reinforcing the reinforcement cross section according to the geology of the ground layer, the drive unit 40 and the excavating rod 20 composed of two or more axes are selectively adjusted by the guide rod 12 and the transfer block 13. As a result, the excavation interval can be narrowed or widened according to the geology of the ground layer, thereby reinforcing the reinforcement cross section and increasing the efficiency of the work.

21 and 22 show the excavation process in the case of constructing the vertical order wall by constructing the drive unit 40 and the excavating rod 20 in five rows or more, and completing the first excavation process and then performing the second excavation. In the process, the excavation process of the vertical order wall is performed in the order of completing the excavation process by opening the first excavation process and performing the third excavation process between the first excavation process and the second excavation process. .

In the embodiment of the present invention, when the drive unit 40 and the excavating rod 20 are configured in two or more axes, the standard of the excavating rod 20 is combined with a large diameter and a small diameter so that the excavation process may proceed. As described above, when the driving unit 40 and the excavating rod 20 are configured in a double row of three axes and two axes, the excavating rod 20 located on the two axes is installed with a small diameter to compensate for the insufficient reinforcement cross section at the circular reinforcement cross section. It can be configured.

On the other hand, when the drive unit 40 and the excavating rod 20 are configured in two or more rows, the excavation process can be performed differently, and as shown in FIG. 22, the first excavation process is completed, and the second excavation process is 2. The second excavation process is performed by opening the distance corresponding to the axis, and the third excavation process is followed by the overlapping ends between the first excavation process and the second excavation process. It is.

Ground improvement device according to an embodiment of the present invention made of such a configuration is configured to be transported to the left and right each drive unit 40 is separately installed in the main body 11 of the auger machine 10, the drive unit 40 Each of the excavation rods 20 are mounted on the excavation rods 20, thereby selectively adjusting the interval between the driving unit 40 and the excavation rod 20 to selectively change the excavation interval according to the geology of the ground layer in the excavation process.

That is, by selectively adjusting the interval of the excavation rod 20 to excavate the ground, when the geological layer is soft, the excavation work proceeds smoothly, so as to widen the interval of the excavating rod 20 to widen the excavation interval. It is possible to proceed quickly, otherwise the rock layer or sandstone layer is difficult to excavate because the excavation work is difficult to narrow the interval of the excavation rod 20 to facilitate the operation.

Next, the ground improvement method using the ground improvement apparatus according to the embodiment of the present invention will be described with reference to FIG. 23 in the drawings.

First, the ground improvement method according to the present invention includes: a ground layer investigation step of examining geology of a region for strengthening soft ground at a coast, a harbor, or a landfill; An excavation interval selection step of selectively adjusting the interval of the excavating rod for excavating the ground in the ground improving apparatus according to the soil layer geologic grasping identified in the ground layer irradiation step; An excavation work step of adjusting the spacing of the excavation rod in the excavation interval selection step and excavating the ground to an excavation depth by operating an air hammer while rotating the excavation rod in the ground improvement device; A mixture filling step of spraying the mortar (hardener) and the fastener at a high pressure in the excavated space in the ground improvement device after the excavation work is completed from the excavation work step to the excavation depth; The mixing step of filling the mixture with the mortar (solidifying agent) and the fastener is injected at high pressure in the mixture filling step and the excavation rod of the ground improving device is slowly stirred;

In the above, the ground layer investigation step is to investigate the geology of the section for strengthening the ground layer in a construction area such as a coast, a harbor or a landfill, and the excavation method and work speed depend on the geology of the ground layer. Filling of the mixture takes place by selecting mortar (hardener) and a fastener.

On the other hand, the excavation interval selection step is to adjust the excavation interval according to the geology of the ground layer identified in the ground layer investigation step, and when the excavation rod for excavating the ground is composed of three axes in the ground improvement device according to the geology of the ground layer The excavation interval can be changed by adjusting the interval of the excavation rod, and in this case, excavation work in the soft ground or rock layer can be made more smoothly and quickly.

In the excavation step, the excavation interval selection step selects and adjusts the interval of the excavation rod according to the geology of the ground layer, and then rotates the excavation rod in the ground improvement device while operating an air hammer to excavate the ground layer. Excavation is carried out to depth.

The mixture filling step is to fill the excavated space with a mortar (hardener) and a fastener. When the excavation is completed from the excavation work stage to the depth of excavation, the ground improvement device is excavated through the first and second shovels and excavation rods. The mortar (solidifying agent) and the fastener are sprayed at high pressure to fill the space.

On the other hand, the stirring operation step is a step in which the excavation rod of the ground improving device is slowly drawn out and the mortar (solidifying agent) and the fastener are injected at high pressure and mixed with the excavated ground soil. As it is sprayed with the excavated ground soil and the mixing efficiency is increased to have the advantage of excellent strength, the first excavation process is completed when the stirring step is completed.

The main feature of the ground improvement method according to the present invention is to selectively adjust the interval of the excavation rod for excavating the ground according to the geology of the ground layer in the excavation interval selection step, if the lipid of the ground layer is weak, the interval of the excavation rod Excavation will proceed quickly by widening, and if the ground is a rock layer or a sandstone layer, the excavation work can be proceeded by narrowing the interval of the excavation rod to facilitate the excavation work.

The preferred embodiments of the present invention have been described above with reference to the present invention, and are not limited to the above embodiments, and those skilled in the art through the above embodiments do not depart from the gist of the present invention. Can be implemented in a variety of changes.

As described above, according to a preferred embodiment of the present invention, since the driving portions of the excavating rod for excavating the ground are separately installed and separately separated in the auger machine of the ground improving device, the excavation interval is selectively adjusted according to the ground layer. By selectively injecting compressed air, mortar (hardener) and fastener into the excavation rod according to the ground or rock layer, the excavation work is quick and easy by the operation of the air hammer. It is to provide the effect of greatly reducing the cost.

In particular, the present invention is because the excavation rod and the driving unit for drilling the ground is separately installed and separately separated in the auger machine, by selectively adjusting the excavation interval according to the geology of the ground layer, the excavation work of the soft ground or rock layer is made smoothly and quickly To provide an effect.

Claims (11)

An auger machine 10 is installed to vertically lift the crawler crane 1, and a drive unit consisting of a gearbox, a reducer, and a motor is installed on the auger machine 10, and is individually mounted to the drive unit and connected in multiple stages. The inner tube 21 is installed and the injection tube 53 is injected into the center of the compressed air and the injection tube 53 is injected into the mortar (hardener) and the fastener to the outer periphery of the inner tube 21, respectively In the ground improvement device is installed and the excavation rod 20 for mounting the outer tube 22 to excavate the ground so as to surround the outside; A guide rod 12 installed horizontally inside the auger machine 10; The drive rod is characterized in that it comprises a drive unit 40 is installed to be transported to the guide rod 12 and is composed of a plurality of gear box 41, reducer 42 and the motor 43 to be separated separately. Detachable ground modifier. The method of claim 1; The transfer block 13 is inserted into the guide rod 12 so as to be transported, and the driving unit 40 is attached and fixed to the transfer block 13 so that the driving unit 40 is installed to be transported to the guide rod 12. Drive separation type ground improvement device. delete The method of claim 1; Drive separation type ground improvement device, characterized in that the connection joint (60) is installed in the connection portion of the injection pipe (53) into which the mortar (solidifying agent) and the fastener is injected in the drilling rod 20 is installed in multiple stages. The method of claim 4; The connecting joint 60 has fastening holes 62 formed at upper and lower ends of the injection pipes 53 adjacent to each other, and a plurality of O-rings 63 are fitted to the inner circumference of the fastening holes 62. Drive separation type ground improvement device, characterized in that the adapter 61 is fitted to be in close contact with the O-ring (63). The method of claim 1; The first shoe bell 50 is installed on the gear box 41 of the driving unit 40 to inject mortar (solidifying agent) through the center of the driving shaft, and the second shoe bell 51 is placed on the upper end of the excavating rod 20. Drive separation type ground improvement device is installed, characterized in that for injecting compressed air and a fastener. The method of claim 1; Separation drive ground improvement device, characterized in that the drive unit 40 is provided to be transported to the guide rod (12), and the excavating rod (20) separately mounted to the drive unit (40) consists of five or more axes. The method of claim 7; Separation drive improved ground, characterized in that the drive unit 40 and the excavating rod (20) consisting of more than five axes are installed to be transported to the guide rod (12) and configured to selectively adjust the spacing. The method of claim 7; Separated ground improvement device, characterized in that the drilling rod 20 is configured to supplement the lack of reinforcement in the circular reinforcement cross-section by combining a large diameter and a small diameter. A ground layer survey step of surveying geology of a region for strengthening the soft ground; An excavation interval selection step of selectively adjusting the interval of the excavating rod for excavating the ground in the ground improving apparatus according to the soil layer geologic grasping identified in the ground layer irradiation step; An excavation work step of adjusting the spacing of the excavation rod in the excavation interval selection step and excavating the ground to an excavation depth by operating an air hammer while rotating the excavation rod in the ground improvement device; A mixture filling step of spraying the mortar (hardener) and the fastener at a high pressure in the excavated space in the ground improvement device after the excavation work is completed from the excavation work step to the excavation depth; Drive separation type ground improvement device comprising the stirring step of mixing the ground soil and the excavation rod of the ground improvement device is mixed with the mortar (solidifying agent) and the fastener is injected at high pressure in the mixture filling step; Ground improvement method using The method of claim 10; Excavation interval selection step is a ground improvement method using a drive separation type ground improvement device characterized in that the excavation interval is changed by selectively adjusting the interval of the excavation rod for excavating the ground according to the geology of the ground layer.

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