KR20110024145A - Drilling device for ground improvement, construction method thereof and construction management system - Google Patents

Abstract

PURPOSE: A drilling device for ground improvement, and a construction method and a construction management system using the same are provided to easily discharge excavated soil to the ground and to monitor the injection of cement stabilizer into a bored hole. CONSTITUTION: A drilling device for ground improvement comprises a drilling bit(10), an air line pipe(20), a first swivel device(30), a second swivel device(31), a power head(40), a temperature sensing blade(50), and a connector(60). The drilling bit has a suction space. The air line pipe is connected to the bottom of a drilling pipe(14) and discharges the seawater in the drilling pipe to the ground through a seawater and excavated soil discharge hose(16). The first swivel device connects the drilling pipe and the air line pipe to an air injection hose(22). The second swivel device connects the drilling pipe to the seawater and excavated soil discharge hose. The power head rotates the drilling pipe and is connected to a leader(73). The temperature sensing blade is fixed to the exterior of the drilling pipe and attached with a temperature sensor. The connector is connected to the temperature sensor of the temperature sensing blade through a temperature transmission cord.

Description

Drilling device for ground improvement, construction method and construction management system {Drilling device for ground improvement, construction method about and construction management system}

The present invention relates to a ground improvement perforation device and its construction method and construction management system, and more specifically, to facilitate the discharge of the excavated soil to the ground when drilling seawater clay layer, such as the coastal landfill layer or the seabed layer to the drilling equipment In addition to shortening the air while achieving the design strength of underground piles using cement hardeners, the cement hardener (cement milk or mortar) is injected into the drilled hole by drilling equipment to construct underground piles in real time. The present invention relates to a ground improvement perforation device, a construction method, and a construction management system to enable the verification and verification of cement solidification state during construction and to efficiently maintain and maintain data.

In general, the method of constructing vertical order walls for column reinforcement or underground excavation by improving or reinforcing the soft ground by columnar piles is the method of placing piles on the ground and excavating the ground. There is a method for constructing a pile, the method of placing the pile on the ground is installed by hitting the pile with a heavy body, the latter method is widely used in recent years due to the problem that vibration, noise and dust is generated, The construction method is a method of drilling through auger (auger) method to a predetermined depth and then filling by filling the cement hardener at the time of drawing.

However, the conventional technique is not easy to discharge to the ground of the excavated soil during the drilling of the coastal landfill layer or the seabed layer consisting of the clay clay (Silthy clay), so that a part of the excavated soil should be re-punched through a long time. It does not dissolve in the circulating water and remains in the perforated hole, so that the quality of the ground piles mixed with cement hardener and the excavated soil is damaged, as well as the integrity of the piles and the strength of the piles are degraded. Caused.

In addition, in order to check whether the excavated soil which is not discharged in the cement hardener injected into the drilling hole is mixed to what position or the bulb of the underground pile is properly formed, the center of the cylindrical pile is formed by core boring ( Core boring) was used to collect samples and visually verify the construction status.However, this is a problem in drilling function (vertical problems of drilling, boring problems in drilling, shaking problems in drilling), etc. There was a difficulty to consume it.

The present invention has been made to solve the above problems, an object of the present invention is to facilitate the discharge of the excavated soil to the ground at the time of drilling the clay clay (Silty clay) such as the coastal landfill layer or the seabed layer Suction drilling to inject excavation soil and seawater by inhalation by air and hydraulic pressure to remove the remaining soil in the drilling hole so as to shorten the air while achieving the design strength of the underground pile using the cement solidifying agent Developing methods and apparatus.

Another object of the present invention to confirm and verify the state of cement hardener injection during construction in real time during the injection of cement hardener into the drilling hole by the drilling equipment to construct underground piles and to maintain data efficiently The present invention provides a ground improvement drilling device, a construction method thereof, and a construction management system.

In order to achieve the above object, the ground improvement cloth mill according to the present invention is an excavation bit formed in a flat cross shape so that the suction space is provided at the bottom of the excavation pipe, which is an excavation shaft, and seawater and excavation soil in the excavation pipe by blowing air In order to discharge the groundwater through the seawater and the excavated soil discharge hose connected to the top of the excavation pipe, the airline pipe communicated with the inside of the excavation pipe, and connected to the top of the airline pipe and combined to form the excavation pipe. A first swivel device for converting and connecting a rotating pipe such as an excavation pipe and an air line pipe to an air injection hose, which is a fixed body, and a second swivel for converting and connecting an excavating pipe that rotates at the top of the drilling pipe to a fixed water, a draining earth and an excavated soil hose. Device, the drilling pipe is rotated and the electric motor It consists of a power head coupled to the reader, a temperature-sensing vane fixed to the outer periphery of the drilling pipe on the upper part of the drilling bit, and a temperature sensor attached thereto, and a connector connected to the temperature sensor and the temperature transfer cord of the temperature-sensing vane. It is a basic feature.

In addition, the ground improvement construction management system of the present invention transmits the temperature of the heat of hydration detected by the temperature sensor during the injection of the cement hardener into the drilling hole to the temperature gauge through the connector and the temperature-related information is transmitted to the converter again and the numerical temperature When the temperature information is converted from the information to a certain color and transmitted to the central processing unit of the computer, the central processing unit outputs the color in which the temperature information is converted by the converter through a certain operation.

When the cement hardener is injected as the punching device is drawn, the cement hardener pump is installed with a flow meter to measure the amount of cement hardener to be injected and transmit the related information to the central processing unit of the computer so that it appears on the monitor.

When the temperature sensor detects a certain temperature abnormality, the excavation pipe rises in conjunction with the motor connected with the wire that raises the fabric factory, and when the depth sensor attached to the power head is moved to the next higher drilling depth mark of the reader, the motor By stopping the operation of the motor in conjunction with the movement of the excavation pipe to move by the interval between the excavation depth mark at a time, the cement solidifying agent injection is characterized in that it is displayed by the excavation depth of a certain interval.

As discussed above, the present inventors improve the ground drilling device and its construction method and construction management system facilitates the discharge of the excavated soil to the ground when drilling the marine clay layer, such as the coastal landfill layer or the seabed layer, to the cement solidification In addition to shortening the air while achieving the design strength of the used underground piles, the cement solidifying agent is injected in real time when the cement solidifying agent is injected into the drilling hole by the drilling equipment to construct the underground piles. It can be verified and has the effect of keeping data efficiently.

When described in detail with reference to the accompanying drawings a preferred embodiment of the present invention configured as described above are as follows.

1 is a view showing the excavation of the ground improvement drilling apparatus according to the present invention, Figure 2 shows the injection of cement hardener of the ground improvement drilling apparatus according to the present invention and shows a circuit diagram of the construction management and monitoring system Figure 3 is a detailed view showing the excavation wing and the temperature-sensing wing of the ground improvement perforation device according to the invention, Figure 4 is a detailed view of the installation of the temperature sensor of the ground improvement perforation device according to the present invention, 5 is a plan view of the temperature sensing wing of the ground improvement drilling apparatus according to the present invention, Figure 6 is a plan view of the excavation wing and the temperature sensing wing of the ground improvement drilling apparatus according to the present invention, Figure 7 is a present invention Fig. 8 is a detailed view showing a power head and a peripheral device of the ground improvement drilling apparatus according to the present invention. Fig. 8 is a cutaway view showing the connector of the ground improvement drilling apparatus according to the present invention. 9 is a view showing a working daily report using the construction management system according to the present invention.

As shown in FIG. 1 to FIG. 9, the present invention is mainly for improving the ground in a marine clay layer such as a coastal landfill layer or a seabed layer, and at the bottom of an excavation pipe 14 which is an excavation axis of a drilling device. The drilling bit 10 having a planar cross shape consists of a combination of the first drilling blade 11 to which the cutter 13 is attached stepwise and the second drilling blade 12 to be horizontally attached.

Here, the cutter 13 is attached to the first drilling blade 11 in a stepwise manner to prevent the overload of the electric motor for rotating the drilling bit 10 by gradually expanding the drilling cross section, the second drilling The wing 12 is attached to the outer circumferential surface of the excavation pipe 14 so as to form an excavation cross section larger than the excavation cross section formed by the first excavation blade 11 on the first excavation blade 11.

In addition, through the suction space 15 between the first drilling blades 11 at the bottom of the excavation pipe 14 is attached to the excavation bit 10 to generate the excavated soil to prevent the remaining of the excavated soil generated during drilling At the same time as excavation, the excavated soil is sucked into the excavation pipe 14 and discharged to the ground.

Here, the air line pipe 20 communicates with the inside of the excavation pipe 14 at the lower part of the excavation pipe 14 for suction type excavation. The air line pipe 20 is connected to an external air compressor 21 to provide air. Blowing out the seawater in the excavation pipe 14 to discharge to the ground through the seawater and the excavated soil discharge hose 16 connected to the top of the excavation pipe (14).

When the seawater in the excavation pipe 14 is discharged by air, the seawater and the excavation soil outside the excavation pipe 14 form a rapid flow rate due to the water pressure due to the difference in the seawater depth, and rapidly into the excavation pipe 14. The process of discharging the seawater mixed with the excavated soil in the excavation pipe 14 to the ground through the seawater and the excavated soil discharge hose 16 by rapidly inflowing and continuously blowing air through the airline pipe 20 at the same time Repeat.

On the other hand, when the work by the drilling device of the present invention is made on land, it will be necessary to continuously inject water into the drilling hole (100).

The drilling bit 10 is not limited to the specific shape as long as the drilling bit 10 can be smoothly drilled and the suction space 15 is provided.

Furthermore, when the excavation pipe 14 and the airline pipe 20 rotate and excavate, the first swivel 30 connected to the top of the airline pipe 20 surrounds the excavation pipe 14. Is coupled to serve to convert the rotating body such as the excavation pipe 14 and the air line pipe 20 to the fixed air injection hose 22. That is, the first swivel 30 is coupled to the outer wall of the ring shape, the side of which is fixed to the excavating pipe 14, the air injection hose 22, and the inner wall closed while being in communication with the air line pipe 20 When the outer wall rotates, the inner wall separated from the outer wall is fixed. Here, in order to supply air from the air injection hose 22 to the air line pipe 20, it is preferable to form a hole (not shown) that can be an air passage on the bottom surface of the inner wall.

Further, at the top of the excavation pipe 14, a conventional second swivel 31 device for converting and connecting the rotating excavation pipe 14 into the fixed seawater and the excavation soil discharge hose 16 is installed. Even if it rotates, the seawater and the excavated soil discharge hose 16 are not rotated, and the power for rotating the excavation pipe 14 and the excavation bit 10 is performed by the power head 40 whose main motor is the electric motor. .

When the excavation is completed to the design depth, the excavation pipe 14 is slowly rotated while the cement hardener 92 is injected into the drilling hole 100 through the seawater and the excavated soil discharge hose 16 or the air injection hose 22. The ground improvement is carried out by lifting the cement solidifying agent 92 through the suction space 15 of the excavating pipe 14 in the sea water and the excavated soil discharge hose 16 or the air injection hose 22. In order to prevent the cement hardener 92 from flowing back to the air line pipe 20, the check valve 23 may be installed at the connection portion of the excavation pipe 14 and the air line pipe 20.

On the other hand, the cement hardener 92 injected through the excavation pipe 14 is generated from the heat of cement hydration when it is mixed with water, the excavation pipe 14 of the upper spaced to some extent from the second excavation wings (12) The temperature sensing wing 50 is fixed to the outer circumferential surface and a predetermined number of temperature sensor 51 is attached to the temperature sensing wing 50 to fill up the hole in the drilling hole 100. It is possible to detect the heat of hydration, and the detected temperature is transmitted to the temperature transfer code 52 in the temperature transfer code protector 53. Here, the temperature transfer cord protector 53 is installed in close contact with the excavation pipe 14 so that the temperature transfer cord 52 is not damaged by the movement of seawater, excavation soil, cement hardener, etc. into the excavation pipe 14. do.

Furthermore, the temperature transfer cord 52 is connected to the connector 60, and then the sensed temperature is transmitted to the temperature gauge 54. The structure of the connector 60 is spaced apart from the excavation pipe 14 to be fixed. A certain number of coupling flanges 62 are coupled to the end or / and center of the connector pipe 61 and the connection flanges 62 are fixed to each other with bolts 63. Fix to the outer circumferential surface. Here, the temperature through the heat transfer cord 52 connected to the connector pipe 61 through the excavation pipe 14 by installing the fiber glass sheet 64 as an insulator between the connecting flange 62 and the connector pipe 61. Information is transmitted only to the temperature transfer fixture 65 and then to the temperature gauge 54.

That is, the temperature transfer fixture 65, which is another fixture, is in contact with the connector pipe 61 of the connector 60, which is fixed to the drilling pipe 14 and rotates together.

Next, the power head 40, which is a power motor for rotating the excavation pipe 14 is coupled to the leader 73 of the drilling device vertically high in a normal manner to reciprocate up and down and transmit power, On the side of the leader 73, a mark 70 for determining the depth of excavation at regular intervals is installed, and the power head 40 is attached to a device in which the depth sensor 71 is installed and the power head 40 is attached. ) Moves up and down, the depth sensor 71 also moves together, and each time the depth sensor 70 passes through the drilling depth cover 70 detects the depth sensor 71 and transmits the relevant information to the depth indicator 72 by wire or wireless. Depth is represented by the number, this information is passed back to the central processing unit 80 of the computer and is transferred to the job report (Fig. 9) after the operation processing.

Here, the depth detection sensor 71 is interlocked with a motor (not shown) connected to a wire that raises the fabric factory, so that when the excavation pipe 14 is raised, the depth detection sensor 71 is the next higher drilling depth. Moving to the mark 70 stops the operation of the motor, and the motor connected to the wire for raising the cloth factory is also linked with the temperature sensor 51, the injection of cement hardener to the temperature sensor 51 When it comes up, the central processing unit 80 of the computer to operate the motor to raise the factory value it will proceed repeatedly.

In addition, referring to the construction management system of the present invention, the temperature roll connector 60 of the heat of hydration detected by the temperature sensor 51 when the cement hardener 92 is injected into the drilling hole 100 as described above. The temperature related information is transmitted to the temperature gauge 54 and the temperature-related information is transmitted to the converter 55 again, converting the temperature information from the numerical temperature information to a constant color, and then transferring the temperature information to the central processing unit 80 of the computer. ) Outputs the color in which the temperature information is converted by the converter 55 on the screen of the monitor 81 through a predetermined operation. At this time, if the temperature detected by the heat of hydration is more than the set temperature input to the converter 55, it appears in red, and if it is below the set temperature, it appears in blue, and the set temperature is a cement hardener (filled in the drilling hole 100) ( It is preferable to set the temperature at the instant when the surface of 92) reaches the temperature sensing blade 50.

In addition, when the cement hardener 92 is injected as the drilling device is drawn out, the cement hardener is applied to the seawater and the excavated soil discharge hose 16 or the air injection hose 22 used as an injection path of the cement hardener 92. The pump 91 is connected and the cement hardener pump 91 is installed with a flow meter 90 to measure the amount of cement hardener 92 injected and transmits the related information to the central processing unit 80 of the computer. The depth-related information by the depth sensor 71 is also transmitted to the central processing unit 80 to be displayed on the monitor 81 screen.

That is, the construction management system collects and DB-forms the information obtained from the above-listed devices, records and prints the amount of cement hardening agent 92 for each excavation depth and the completed ground improvement holes to efficiently record maintenance and management after construction. When the surface of the cement hardener 92 filled into the drilling hole 100 reaches the temperature sensing blade 50, the color column of the workday form of FIG. 9, which is programmed by a certain software, is blue at the corresponding depth. Motor which is converted into red at the same time and the amount of cement solidifying agent 92 measured by the flow meter 90 is input to the corresponding depth and connected with the wire for raising the fabric factory while interlocking with the temperature sensor 51. (Not shown) is operated to move the depth detection sensor 71 to the next higher drilling depth mark 70 installed on the leader 73 at regular intervals. Cement solidifying agent (92) after the dose is injected is to be written to the next higher depth of excavation work daily.

When the above process is repeated, the cement solidifying agent 92 injection amount information up to the inlet of the boring hole 100 can be displayed according to the excavation depths at regular intervals and can be displayed on the workday of the completed ground improvement highway monitor. It is possible to confirm and verify the injection status and the state of the 92, and the record keeping is easy, so that the construction management is convenient. In addition, the construction failure of the ground piles generated by this process can support the design load by comprehensively reviewing the total cement solidifying agent (92) injection amount of the ground improvement holes completed even if some defective ground piles are confirmed by the workday. Judgment should be made.

When explaining the action through the ground improvement construction method of the present invention as follows.

First, it mounts on the seabed which will be punched on the barge of the sea.

Next, the first and second excavation blades 11 and 12 at the bottom of the excavation pipe 14, which are the excavation shafts of the drilling device, rotate to excavate to the design depth, and at the same time, the excavation soil is generated between the first excavation wings 11 immediately. It is discharged to the ground through the suction space of the 15, the discharge of the excavated soil is discharged of seawater in the excavation pipe 14 by the injection of air into the excavation pipe 14, and the excavation pipe 14 by the hydraulic pressure It is made by the rapid inflow of the excavated soil and excavation pipe 14 of the seawater, the injection of air into the excavation pipe 14 must be made continuously throughout the process.

Subsequently, when the excavation is completed to the design depth, the excavation pipe 14 is raised while injecting the cement hardener 92 into the drilling hole 100. The elevation of the excavation pipe 14 is a temperature sensing wing 50 When the surface of the cement solidifying agent (92) filling up in the drilling hole (100) approaches or reaches the surface of the cement solidifying agent (92) by the temperature sensor (51) attached to the temperature sensing blade (50). The motor (not shown) connected to the wire for raising the cloth factory value is activated by sensing the heat of hydration and interlocking with the temperature sensor 51. Here, the elevation of the excavation pipe 14 is moved by the interval between the excavation depth marks 70 at a time, which is made possible by interlocking with a motor connected with a wire for raising the depth sensor 71.

In addition, the temperature sensed by the temperature sensor 51 is transmitted to the central processing unit 80 of the computer via the temperature gauge 54 and the converter 55, where the temperature information is color-coded by the converter 55 Transfer of the cement hardener 92 which is converted and recorded in the working day and on the one hand is linked with a motor connected with a wire that raises the mill factory, and rises the mill factory, and is injected while the punching device is raised. It is measured by) and is transmitted to the central processing unit 80, the data is interlocked with the depth sensor 71, the amount of cement hardener 92 to the inlet of the drilling hole 100 is displayed for each excavation depth.

While specific preferred embodiments of the present invention have been illustrated and described above, the present invention is not limited to the above-described embodiments, and a person skilled in the art to which the present invention pertains has the technical gist of the present invention. Various changes can be made without departing.

1 is a view showing the excavation of the ground improvement drilling apparatus according to the present invention.

2 is a view showing the injection of cement hardener of the ground improvement drilling apparatus according to the present invention and a circuit diagram of a construction management and monitoring system.

Figure 3 is a detailed view showing the excavation wing and the temperature-sensing wing of the drilling device for improving the ground according to the present invention.

Figure 4 is a detailed view of the installation of the temperature sensor of the ground improvement perforation device according to the present invention.

Figure 5 is a plan view of the temperature sensing blade of the ground improvement perforation device according to the present invention.

Figure 6 is a plan view of the excavation wing and the temperature-sensing blade of the ground improvement drilling apparatus according to the present invention.

Figure 7 is a detailed view showing the power head and its peripheral device of the ground improvement drilling apparatus according to the present invention.

Figure 8 is a cut-away detail view showing the connector of the ground improvement perforation device according to the present invention.

9 is a view showing the working daily report using the construction management system according to the present invention.

Explanation of symbols on the main parts of the drawings

10: drilling bit 11: first drilling wing 12: second drilling wing

13: cutter 14: excavation pipe 15: suction space

16: Seawater / excavated soil discharge hose 20: Airline pipe 21: Air compressor

22: air injection hose 23: check valve 30: first swivel

31: second swivel 40: power head 50: temperature sensing wing

51: temperature sensor 52: temperature code 53: temperature code protective device

54: temperature gauge 55: transducer 60: connector

61: connector pipe 62: connection flange 63: bolt

64: fiberberger seat 65: temperature transfer fixture 70: drilling depth cover

71: depth sensor 72: depth indicator 73: reader

80: central processing unit 81: monitor 90: flow meter

91: cement hardener pump 92: filled cement hardener 100: drilling hole

Claims (7)

An excavation bit 10 formed in a flat cross shape so that the suction space 15 is provided at the bottom of the excavation pipe 14 which is an excavation shaft, The excavation pipe 14 under the excavation pipe 14 to blow air to discharge the seawater and excavation soil in the excavation pipe 14 to the ground through the seawater and excavation soil discharge hose 16 connected to the top of the excavation pipe 14. ) An air line pipe 20 in communication with the inside, Connected to the top of the air line pipe 20 to surround the excavation pipe 14 is connected to convert the rotating body such as the excavation pipe 14 and the air line pipe 20 to a fixed air injection hose 22 A first swivel 30 device, A second swivel (31) device for converting and connecting the drilling pipe (14) rotating at the top of the drilling pipe (14) to the fixed body seawater and the excavation soil discharge hose (16); A power head 40 which rotates the excavation pipe 14 and uses the electric motor as the main power and is coupled to the leader 73; A temperature sensing blade 50 fixed to an outer circumferential surface of the drilling pipe 14 above the drilling bit 10 and having a temperature sensing sensor 51 attached thereto; and Ground perforation device, characterized in that consisting of a connector 60 connected to the temperature sensor 51 and the temperature transfer cord 52 of the temperature sensor blade (50). The method of claim 1, The drilling bit 10 and the first drilling blade 11 is attached to the cutter 13 in a stepped manner, The second drilling wings 12 are horizontally attached to the outer circumferential surface of the excavating pipe 14 to form an excavation cross section larger than the excavation cross section formed by the first excavation wings 11 on the first excavation wing 11. A perforation device for ground improvement, characterized in that. The method of claim 1, The first swivel 30 is composed of a ring-shaped outer wall body fixed to the excavating pipe 14 and having an open side, coupled to the air injection hose 22 and in communication with the air line pipe 20 and closed at the same time. A perforation device for ground improvement, characterized in that. The method of claim 1, The connector 60 couples a certain number of connection flanges 62 to the end or / and the center of the connector pipe 61 which is spaced apart from the excavation pipe 14 and bolts 63 to each other. At the same time, the connecting flange 62 is fixed to the outer circumferential surface of the excavating pipe 14, but the fiber glass sheet 64, which is an insulator, is installed between the connecting flange 62 and the connector pipe 61 to connect the excavating pipe 14. Ground perforation device for improving the soil, characterized in that the temperature information through the temperature transfer cord 52 connected to the connector pipe 61 is transmitted only to the temperature transfer fixture (65). The method of claim 1, An excavation depth cover 70 installed at a predetermined interval on the leader 73 and a depth detection sensor 71 that detects the excavation depth cover 70 and is attached to the power head 40 are additionally configured. Ground improvement drilling device. When the cement hardener 92 is injected into the drilling hole 100, it is transmitted to the temperature gauge 54 through the temperature roll connector 60 of the heat of hydration sensed by the temperature sensor 51 and the temperature related information is converted back to the converter. Transmitting the temperature information from the numerical temperature information to the constant color and transmitting the same to the central processing unit 80 of the computer, the central processing unit 80 undergoes a constant calculation and the temperature information is transferred to the monitor 81. Output the color converted by When the cement hardener 92 is injected as the punching device is drawn, the cement hardener pump 91 is installed with a flow meter 90 to measure the amount of cement hardener 92 injected and to provide related information to the central processing of the computer. Sent to device 80 so that it appears on monitor 81, When the temperature sensor 51 detects a predetermined temperature or more, the depth pipe sensor 71 attached to the power head 40 is raised and the excavation pipe 14 is raised in conjunction with a motor connected with a wire that raises the fabric factory value. Is moved to the next higher drilling depth mark 70 of the leader 73 by interlocking with the motor again to stop the operation of the motor so that the rise of the drilling pipe 14 moves by the interval between the drilling depth marks 70 at a time. Cement solidifying agent (92) is the ground improvement construction management system, characterized in that the injection depth is displayed by the depth of excavation at regular intervals. (a) mounting it on the seabed to be drilled on the barge of the seabed; (b) The first and second excavation blades 11 and 12 at the bottom of the excavation pipe 14, which are the excavation shafts of the drilling device, are rotated to excavate to the design depth, and at the same time, the excavation soil is immediately generated between the first excavation wings 11. It is discharged to the ground through the suction space of the 15, the discharge of the excavated soil is discharged of seawater in the excavation pipe 14 by the injection of air into the excavation pipe 14, and the excavation pipe 14 by the hydraulic pressure By a rapid inflow of the excavated soil and seawater into the excavation pipe (14); (c) When the excavation is completed to the design depth, the excavation pipe 14 is raised while injecting the cement hardener 92 into the drilling hole 100. The elevation of the excavation pipe 14 is a temperature sensing wing 50. The heat of hydration of the cement hardener 92 by the temperature sensor 51 attached to the temperature sensing blade 50 when the surface of the cement hardener 92 which is filled in the drilling hole 100 approaches or reaches. The motor is connected to the wire to increase the cloth factory while operating in conjunction with the temperature sensing sensor 51 is detected, the depth sensor 71 and the motor is connected to the wire to increase the cloth factory Ascending of the excavation pipe 14 by interlocking moves at a time by the interval between the excavation depth marks 70, and (d) The temperature sensed by the temperature sensor 51 is transmitted to the central processing unit 80 of the computer via the temperature gauge 54 and the converter 55, and the cement hardener injected while the drilling device is raised ( 92 is measured by the flow rate meter 90 and transmitted to the central processing unit 80, the data is interlocked with the depth sensor 71, the injection amount of cement hardener 92 to the inlet of the drilling hole 100 excavation Ground improvement construction method characterized in that it consists of steps to be displayed for each depth.

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