JP6976806B2 - Construction management method of ground improvement body - Google Patents

Description

The present invention relates to a method for managing the formation of a ground improvement body, which is formed by injecting a hardened material into the ground at high pressure or discharging a chemical solution.

As a ground improvement method to create a ground improvement body in the ground and improve the ground to be strong, a high-pressure injection stirring method that injects a hardened material into the ground at high pressure to diffuse the ground and create a ground improvement body, A chemical injection method for creating a ground improvement body by ejecting a chemical solution into the ground is known.
14A and 14B are explanatory views illustrating a method of creating a ground improvement body by a conventional high-pressure injection stirring method, FIG. 14A is an explanatory view when the formation of the ground improvement body is started, and FIG. 14B is an explanatory view showing the formation of the ground improvement body. It is explanatory drawing at the time of going.

In the high-pressure injection stirring method, as shown in the figure, a pipe rod 40 having an injection port 41 for injecting a hardening material such as cement milk M, and a construction machine (not shown) for inserting the pipe rod 40 into the ground are used. .. At the time of constructing the ground improvement body, first, the pipe rod 40 is inserted into the ground to a predetermined depth by a construction machine. Next, as shown in FIG. 14A, the cement milk M is injected into the ground at high speed and high pressure from the injection port 41 while rotating the pipe rod 40 360 degrees, and the ground is cut by the injection energy of the injected cement milk M. Cement milk M and the ground are mixed and stirred. Subsequently, as shown in FIG. 14B, mixing and stirring of the cement milk M and the ground is performed while pulling out the pipe rod 40 upward. As a result, a vertically columnar columnar ground improvement body T can be created in the ground, and the ground can be improved to be strong by the created ground improvement body T.

By the way, in the high-pressure injection stirring method, after the ground improvement body T is created in the ground, it is determined whether or not the created ground improvement body T has the designed shape and the filling state of the hardened material in the ground. Then, the finished shape of the ground improvement body T is confirmed.
The method of confirming the finished shape of the ground improvement body T in the ground is to perform check boring to collect a sample using a boring machine after creating the ground improvement body T, or to excavate the ground and check directly. There is a way.

However, the method of performing check boring requires a large number of other equipment together with the boring machine, and the equipment becomes large, so that there is a problem that the work cost is high. Further, since all the collected samples are visually confirmed, there is a problem that the work is troublesome and the workability is poor.
In addition, since the sample is collected by check boring after the ground improvement body T is created, the hardened ground improvement body T may also be bored, so that the rod used is made highly rigid. There is a need. Therefore, there is a problem that the cost becomes high.

The method of excavating the ground and directly checking it has a problem that the work is very time-consuming and takes a lot of time because the ground is actually excavated. In addition, if the ground improvement body T is created deeper than a certain depth in the ground, it may not be possible to actually excavate to that depth, so check the finished shape of the ground improvement body T in the ground. There is a problem that sometimes it cannot be done.

The present invention has been made in view of such a problem in the conventional ground improvement method, and an object thereof is to be able to determine the state of filling the hardened material or the chemical solution in the ground in real time and with high accuracy. It is to provide a method for creating and managing a ground improvement body that can be carried out inexpensively without any trouble.

The present invention has a first step of installing a ground insertion board equipped with a sensor for detecting a sprayed hardened material or a discharged chemical solution in the ground on which a ground improvement body is created, and after the first step, in the ground. When creating a ground improvement body, a sensor mounted on the ground insertion board detects the injected hardened material or the discharged chemical solution, and based on the detection result, the state of filling the hardened material or the chemical solution into the ground is determined. has a step, a ground insert board, the rigidity is formed of a material easily transmitted non-permeable vibration and heat is low both in the plate having a plurality of elongated holes extending in the longitudinal direction , Sensors are arranged in a long hole, and the sensor is a method for creating and managing a ground improvement body in which a plurality of sensors are arranged in one long hole at intervals in the longitudinal direction of the ground insertion board.

According to the present invention, it is possible to determine in real time and with high accuracy whether or not the ground improvement body has a finished shape as designed, and the state of filling the ground with a hardening material or a chemical solution, and to create the ground improvement. You can properly manage the shape of your body. In addition, it is possible to manage the finished shape of the ground improvement body to be created by simply installing the ground insertion board in the ground, and as a result, it is possible to create the ground improvement body as designed at low cost without any trouble. It is possible to reduce the construction cost.

It is explanatory drawing of the apparatus which creates the ground improvement body in the ground used in the creation management method of the ground improvement body of this invention. It is explanatory drawing of the apparatus which discriminates the filling state of the hardening material in the ground used in the construction management method of the ground improvement body of this invention. 3A is a front view of the ground insertion board, and FIG. 3B is a front view of the ground insertion board. 4A is a sectional view taken along the line AA of FIG. 3A, and FIG. 4B is an enlarged view of a portion B of FIG. 4A. It is a top view explaining the direction when the ground insertion board is installed in the ground. It is a perspective view of an intubation tube. FIG. 7A is an explanatory diagram showing a state in which the insertion pipe is attached to the construction machine, FIG. 7B is an explanatory diagram showing a state in which the insertion pipe is inserted into the ground by the construction machine, and FIG. 7C is an explanatory view showing the insertion pipe. It is explanatory drawing which shows the state which pulled out and left the ground insertion board in the ground. FIG. 8A is an explanatory diagram showing a state in which the ground insertion board is installed in the ground, and FIG. 8B is an explanatory diagram showing a state in which the cable from the sensor is connected to the management device. FIG. 9A is an explanatory diagram showing a state in which detection is performed by a sensor during the construction of the ground improvement body, and FIG. 9B shows a state in which detection is continuously performed by the sensor while the ground improvement body is being constructed. It is explanatory drawing which shows. It is a front view of another ground insertion board. It is explanatory drawing which shows the state which the sensor is performing the detection at the time of the ground improvement body construction. It is explanatory drawing which shows the state which the sensor is performing the detection at the time of the ground improvement body construction by another method. It is explanatory drawing which shows the state which the sensor is performing the detection at the time of the ground improvement body construction by another method. FIG. 14A is an explanatory diagram when the construction of the conventional ground improvement body is started, and FIG. 14B is an explanatory diagram when the construction of the conventional ground improvement body is being performed.

The first embodiment of the method of creating and managing the ground improvement body of the present invention will be described with reference to the drawings.
The construction management method of the ground improvement body according to the present embodiment (hereinafter, simply referred to as the main construction management method) is a state in which the hardened material is filled in the ground when the ground improvement body is constructed in the ground by the high pressure injection stirring method. It is a method of managing the finished shape of the ground improvement body to be created by discriminating (before filling, insufficient filling, completion of filling).
Here, the hardening material is cement milk M. However, the cured material is not limited to this.
Further, the ground improvement method will be described as a high-pressure injection stirring method, but the method is not necessarily limited to the high-pressure injection stirring method. And so on.

The apparatus used in the present construction management method includes an apparatus for constructing a ground improvement body in the ground shown in FIG. 1 and an apparatus for determining the filling state of the cured material in the ground shown in FIG.
As shown in FIG. 1, the device for creating the ground improvement body has a pipe rod 1 to be inserted into the ground, and also has a construction machine 2 for inserting or pulling out the pipe rod 1 to a predetermined depth. In the construction machine 2, a mast 3 is erected at the front portion, and a pipe rod 1 is attached along the mast 3. At the same time, it has an elevating device 4 for inserting or pulling out the pipe rod 1 into the ground, and a rotating device 5 for rotating the pipe rod 1. The pipe rod 1 is a hollow steel pipe through which cement milk M flows. The pipe rod 1 has an injection port 6 at the lower end thereof for injecting cement milk M, and the cement milk M is injected into the ground at high speed and high pressure from the injection port 6.
Although not shown, equipment for supplying cement milk M, compressed air, or the like to the pipe rod 1 attached to the construction machine 2 is provided around the construction machine 2.

At the time of constructing the ground improvement body T, the pipe rod 1 is inserted to a predetermined depth by the construction machine 2 as in the conventional case, and after the insertion, the cement milk M is poured into the ground from the injection port 6 while rotating the pipe rod 1. It is jetted at high speed and high pressure, and the ground is cut with the jet energy of cement milk M to mix and stir the cement milk M and the ground. Mixing and stirring the cement milk M and the ground is performed while pulling out the pipe rod 1 to create a vertically columnar ground improvement body T in the ground.

As shown in FIG. 2, the device for determining the filling state of the hardened material in the ground includes a ground insertion board 7 installed in the ground where the ground improvement body T is created, and a management device 8 installed on the ground. ..
The ground insertion board 7 is an elongated plate formed of a non-permeable material having low rigidity and hardly transmitting vibration and heat, and has a plurality of elongated holes 11 extending in the longitudinal direction thereof within the plate thickness. .. Here, the non-water-permeable material having low rigidity and difficult to transmit vibration and heat is a polyolefin resin. Examples of the polyolefin resin include polyethylene (PE) and polypropylene (PP).

Specifically, as shown in FIGS. 3A, 3B, 4A, and 4B, the ground insertion board 7 is made of a polyolefin resin having an uneven cross section in the lateral width direction (horizontal direction in FIGS. 3A and 4A). It is composed of a core material 12 and a sheet material 13 made of a polyolefin resin that sandwiches and integrates both side surfaces (surfaces in the front-rear direction in FIG. 3A) of the core material 12. The extending direction (longitudinal direction) of the core material 12 and the sheet material 13 is a vertical direction (vertical direction in FIGS. 3A and 3B) orthogonal to the horizontal width direction of the core material 12 and the sheet material 13.

The ground insertion board 7 has an elongated plate shape as a whole, is partitioned by a core material 12 having an uneven cross section and sheet materials 13 on both sides thereof, and has an elongated hole 11 extending in the longitudinal direction within the plate thickness. Provide multiple along the direction. Here, the number of the plurality of elongated holes 11 is 11, but the number is not limited to this. In the ground insertion board 7, the width direction dimension (shown in the left-right direction in FIG. 3A) is about 3 to 15 cm, and the plate thickness dimension (shown in the left-right direction in FIG. 3B) is about 0.5 to 2 cm. However, the dimensions are not limited to this.
The ground insertion board 7 is folded back at the tip and an anchor 15 is attached to the ground insertion board 7 in order to install it in the ground by the installation method described later.

As shown in FIG. 3A, the ground insertion board 7 is equipped with a sensor 20 that detects cement milk M sprayed into the ground when a ground improvement body is created in the ground.
The sensor 20 is a vibration device that measures vibration, and is a vibration sensor that detects the filling state of cement milk M in the ground by measuring vibration. The size of the sensor 20 is a size that can be arranged in the elongated hole 11 provided in the ground insertion board 7, and here, the length and width are about 17 mm, and the thickness is about 5 mm.

The sensor 20 is mounted in a plurality of elongated holes 11 provided in the ground insertion board 7. For example, one sensor 20 is mounted in one long hole 11, and the sensor 20 is mounted in each of the plurality of long holes 11. At this time, the plurality of sensors 20 are arranged at equal intervals in the longitudinal direction of the ground insertion board 7 at predetermined intervals. That is, the sensors 20 arranged in the plurality of elongated holes are arranged at intervals from each other in the extending direction of the elongated holes.
An opening 14 is formed on the surface of the elongated hole 11 to which the sensor 20 is mounted, and the sensor 20 is exposed on the surface of the ground insertion board 7 by the opening 14.

A cable 21 that reaches the ground through the inside of the long hole 11 is connected to the sensor 20 mounted in the long hole 11 of the ground insertion board 7. That is, the cables 21 connected to the sensor 20 are arranged in the plurality of elongated holes 11 of the ground insertion board 7.
Here, a wired method for connecting the cable 21 to the sensor 20 is adopted, but the method is not necessarily limited to the wired method, and a wireless method may be adopted.

Further, as shown in FIG. 2, a cable 21 connected to the sensor 20 is connected to the management device 8 installed on the ground, and the vibration measured by the sensor 20 is input as a detection result. The management device 8 performs a predetermined arithmetic process based on the input detection result, that is, by comparing the measured vibration magnitude (amplitude) with a predetermined magnitude, the cement milk M into the ground. Determine the filling state of. Further, the management device 8 has a display device 25, and here, the display device 25 is a display, and the discrimination result (filling state of the cement milk M) is displayed on the display 25. For example, the cement milk M before filling is red, the filling shortage is yellow, and the filling completion is green, and the discrimination results obtained from each of the plurality of sensors 20 are displayed in different colors on the display 25. Thereby, by looking at the display 25, it is possible to determine the filling state of the cement milk M in the ground.
Further, the sensor 20 and the management device 8 can not only determine the filling state of the cement milk M, but also determine whether it is the cement milk M, water, or soil from the measured vibration. ..

The sensor 20 has one sensor 20 mounted in one long hole 11 in a plurality of long holes 11 provided in the ground insertion board 7, but the sensor 20 is not limited to this, and a plurality of sensors 20 are mounted in one long hole 11. The sensors 20 may be mounted at intervals in the longitudinal direction of the ground insertion board 7.
The sensor 20 is not limited to a vibration sensor, but is not limited to other sensors, for example, a temperature sensor that detects cement milk M by measuring temperature, and cement milk M by measuring hydrogen ion index (pH: pH). A hydrogen ion index sensor that detects pH, an oxidation-reduction potential sensor that detects cement milk M by measuring the oxidation-reduction potential (ORP), and an electrical conductivity that detects cement milk M by measuring electrical conductivity (EC). It may be a sensor or the like. Further, the sensor 20 is not one of a vibration sensor, a temperature sensor, a hydrogen ion index sensor, an oxidation-reduction potential sensor, and an electric conductivity sensor, and a plurality of sensors may be used in combination.

Next, the construction management method will be described.
This construction management method includes a first step of installing the ground insertion board 7 in the ground and a second step of determining the filling state of the cement milk M in the ground.
In the first step, a sensor 20 for detecting the injected cement milk M was attached to a predetermined position in the ground where the ground improvement body T is created, for example, the outer peripheral edge of the designed finished shape of the ground improvement body T. The ground insertion board 7 is installed. The ground insertion board 7 is basically installed at one place. However, the installation position is not limited to this, and may be a plurality of locations.

Further, as shown in FIG. 5, the orientation of the ground insertion board 7 at the time of installation is such that the surface of the ground insertion board 7 on the side where the injected cement milk M is detected (indicated by A in FIG. 5) is the ground improvement body. It is orthogonal to the injection direction of the cement milk M at the time of T formation (the direction in which the cement milk M flies from the injection port 6 of the pipe rod 1). The surface A on the side where the injected cement milk M is detected is the surface A of the ground insertion board 7 in which the sensor 20 is mounted in the elongated hole 11 and an opening 14 is formed on the surface thereof to form the injected cement milk M. This is the surface on the side that comes to be detected.
As a result, the cement milk M sprayed at the time of creating the ground improvement body T hits the sensor 20 mounted on the ground insertion board 7 from the front, so that the sensor 20 can accurately detect the cement milk M.

Subsequently, along with the installation of the ground insertion board 7, the sensor 20 mounted on the ground insertion board 7 and the management device 8 installed on the ground are connected, and the detection result input from the sensor 20 in the management device 8 is sent into the ground. Prepare so that the filling state of the cement milk M can be determined.

The method of installing the ground insertion board 7 has an insertion pipe 27 that can be inserted into the ground, and the insertion or removal of the insertion pipe 27 into the ground is performed by using the construction machine 30. As shown in FIG. 6, the insertion tube 27 has a vertically long rectangular cylinder that can accommodate an elongated thin plate-shaped ground insertion board 7 in the vertical direction, and an opening 28 is formed at the upper and lower ends thereof. When the ground insertion board 7 is housed inside the insertion pipe 27, the folded portion of the tip (lower end) of the ground insertion board 7 protrudes from the opening 28 at the lower end of the insertion pipe 27, and the anchor 15 attached to the ground insertion board 7 (FIG. (Shown in 3) is hooked to the lower end of the insertion tube 27.

As shown in FIG. 7A, the construction machine 30 has a self-propellable machine 31 equipped with a driver's seat, a boom 32 is attached to the body 31, and an attachment 33 is provided at the tip of the boom 32. .. An insertion pipe 27 accommodating the ground insertion board 7 is attached to the attachment 33 at the tip of the construction machine 30. The machine used here is not limited to the construction machine 30, and may be, for example, the construction machine 2 used when creating the ground improvement body T.

Next, as shown in FIG. 7B, in the construction machine 30, the insertion pipe 27 is placed at a predetermined position in the ground together with the ground insertion board 7, for example, at the outer peripheral edge of the designed finished body of the ground improvement body T, and at a predetermined position. Insert in the orientation. After inserting the intubation 27 to a predetermined depth, the intubation 27 is pulled out by the construction machine 30 as shown in FIG. 7C. At this time, the anchor 15 attached to the tip of the ground insertion board 7 does not pull out the ground insertion board 7 together with the insertion pipe 27, and only the ground insertion board 7 is left in the ground. As a result, as shown in FIG. 8A, the installation of the ground insertion board 7 in the ground is completed.

Subsequently, as shown in FIG. 8B, the cables 21 from the plurality of sensors 20 mounted on the ground insertion board 7 are connected to the management device 8 installed on the ground. The management device 8 makes it possible to discriminate the filling state of the cement milk M into the ground from the detection result input from the sensor 20, and prepares the display 25 to display the filling state of the cement milk M so that the filling state can be discriminated.

In the second step, after the first step, when the ground improvement body T is created in the ground, the cement milk M sprayed by the sensor 20 mounted on the ground insertion board 7 is detected, and the cement milk M is detected in the ground based on the detection result. The filling state of the cement milk M in the container is determined.
Specifically, after the pipe rod 1 is inserted to a predetermined depth in the ground by the construction machine 2, cement milk M is sprayed from the injection port 6 while rotating the pipe rod 1, and this is performed upward. A ground improvement body T is created in the ground. When the ground improvement body T is created, as shown in FIG. 9A, vibration is measured by a plurality of sensors 20 mounted on the ground insertion board 7.

Subsequently, the vibration measured by the plurality of sensors 20 is input to the management device 8 installed on the ground as a detection result. The management device 8 determines the filling state of the cement milk M in the ground based on the detection result. The determination of the filling state of the cement milk M is performed by all of the plurality of sensors 20, and the determination result is displayed on the display 25 for each sensor 20. That is, there is a step of discriminating the filling state of the cement milk M by the management device 8 based on the detection result of the sensor 20 and displaying the discriminating result on the display 25.
As shown in FIG. 9B, the ground improvement body T is created in the ground for measuring the vibration by the plurality of sensors 20, discriminating the filling state of the cement milk M in the management device 8, and displaying the discrimination result on the display 25. During this time, it is performed continuously, that is, from a predetermined depth in the ground to the vicinity of the ground surface (the upper end of the ground improvement body to be created).

As a result, the operator actually creates the ground improvement body T from the discrimination results displayed for each sensor 20 on the display 25 of the management device 8 (injecting cement milk M from the injection port 6). By looking at the discrimination result obtained from the sensor 20 corresponding to the position, the filling state of the cement milk M in the ground can be discriminated in real time.
Further, since the filling state of the cement milk M is displayed on the display 25 in real time, the operator can further spray the cement milk M if, for example, the cement milk M is found to be insufficiently filled. As a result, the ground improvement body T as designed can be created.

In this construction management method, the ground improvement body T to be created in the ground is a vertical columnar shape, but the shape of the ground improvement body T is not limited to this, for example, cement milk which is a hardening material. Other shapes such as a wall shape formed by injecting M linearly or a fan shape may be used.

As described above, according to this construction management method, the ground insertion board 7 is installed in the ground (first step), and cement is cemented by the sensor 20 attached to the ground insertion board 7 when the ground improvement body T is constructed. By detecting the milk M and determining the filling state of the cement milk M in the ground (second step), whether or not the ground improvement body T has the designed shape or not, the cement in the ground The filling state of the milk M can be determined in real time, and the finished shape of the ground improvement body T to be created can be appropriately managed. In addition, it is possible to manage the finished shape of the ground improvement body T to be created by simply installing the ground insertion board 7 in the ground, and as a result, the ground improvement body T as designed can be inexpensively done without any trouble. Can be created and the construction cost can be reduced.

Further, by forming the ground insertion board 7 with a non-permeable material having low rigidity and hardly transmitting vibration and heat, for example, when a vibration sensor or a temperature sensor is used for the sensor 20, vibration or vibration occurs in the ground insertion board 7. It becomes difficult for heat to be transmitted, and it is not affected by vibration or heat from other places. As a result, the sensor 20 can satisfactorily detect the cement milk M, and can determine the filling state of the cement milk M with high accuracy.

Further, according to the present construction management method, the cable 21 connected to the sensor 20 is covered by the ground insertion board 7 by passing through the elongated hole 11 of the ground insertion board 7. From this, it is possible to eliminate the disconnection of the cable 21 due to the cement milk M sprayed at the time of constructing the ground improvement body T.
Since the ground insertion board 7 has an opening 14 formed only on the surface of the portion where the sensor 20 is mounted, the jetted cement milk M does not enter into the elongated hole 11 of the ground insertion board 7. As a result, the cement milk M can be satisfactorily filled into the ground.

Further, since the ground insertion board 7 is made of a polyolefin resin, which is a non-permeable material having low rigidity and hardly transmitting vibration and heat, processing such as cutting is extremely easy. From this, for example, in the ground insertion board 7, it is possible to perform processing such as cutting in the longitudinal direction and changing the dimension in the width direction, and it is possible to provide the optimum ground insertion board 7 according to each site. It is possible.

In the ground insertion board 7 described in the present embodiment, the sensors 20 arranged in the plurality of elongated holes 11 are arranged at intervals in the extending direction of the elongated holes 11, but the present invention is limited to this. Instead, at least a part of the sensor 20 may be arranged at the same position in the extending direction of the elongated hole 11 without being spaced apart from each other.

Specifically, as shown in FIG. 10, in the ground insertion board 7, sensors 20 are mounted in two different elongated holes 11, and the two sensors 20 are spaced apart from each other in the extending direction of the elongated holes 11. It is placed in the same position without leaving a space. The two sensors 20 arranged at the same position are referred to as a set of sensors 20, and the set of sensors 20 are spaced apart from each other in the longitudinal direction of the ground insertion board 7 (the extending direction of the elongated hole 11). Are evenly spaced. In this way, by arranging the two sensors 20 at the same position in the extending direction of the elongated hole 11, the cement milk M sprayed into the ground can be detected simultaneously by the two sensors 20, and the detection accuracy can be improved. It can be significantly enhanced.

The number of sensors 20 arranged at the same position in the extending direction of the elongated hole 11 is not limited to two, and may be three or more. Further, as the sensor 20 arranged at the same position, the same sensor such as a vibration sensor, a temperature sensor, a hydrogen ion index sensor, a redox potential sensor, an electric conductivity sensor, or the like may be used, or different sensors may be used. May be good.

Next, the second embodiment of the construction management method of the ground improvement body of this invention will be described.
When constructing the ground improvement body T in the ground, in the above-mentioned first embodiment, the high-pressure injection stirring method of injecting cement milk M, which is a hardening material, at high pressure was performed, but here, the chemical solution S is in the ground. It is carried out by a chemical injection method for creating a ground improvement body T by discharging it into the ground.
The device for creating the ground improvement body T has a pipe rod 1 to be inserted into the ground, and also has a construction machine 2 for inserting or pulling out the pipe rod 1 to a predetermined depth. The chemical solution S is discharged therein. As a result, the pipe rod 1 is inserted to a predetermined depth by the construction machine 2, and after the insertion, the chemical liquid S is discharged from the pipe rod 1 and the chemical liquid S is discharged multiple times upward into the ground. Create a ground improvement body T.

Further, the devices for determining the filling state of the chemical solution S in the ground are the ground insertion board 7 installed in the ground where the ground improvement body T is created and the management device 8 installed on the ground, as in the first embodiment. Have. The ground insertion board 7 is an elongated plate formed of a non-water-permeable material (polyolefin resin) having low rigidity and hardly transmitting vibration and heat, and has a plurality of elongated holes 11 extending in the longitudinal direction thereof in the plate thickness. Preparing for.

Next, the construction management method of the ground improvement body T according to the present embodiment will be described.
The method for managing the creation of the ground improvement body T according to the present embodiment also includes a first step of installing the ground insertion board 7 in the ground and a second step of determining the filling state of the chemical solution S in the ground. In the first step, as in the first embodiment, a ground insertion board 7 equipped with a sensor 20 (vibration sensor) for detecting the discharged chemical solution S is installed in the ground where the ground improvement body T is created. As for the orientation of the ground insertion board 7 at this time, as in the first embodiment, the surface of the ground insertion board 7 on the side where the discharged chemical liquid S is detected is the discharge direction of the chemical liquid S at the time of forming the ground improvement body T. It is orthogonal to the direction in which the chemical solution S flies from the tube rod 1).
At the same time, the sensor 20 mounted on the ground insertion board 7 and the management device 8 installed on the ground are connected, and the control device 8 determines the filling state of the chemical solution S in the ground from the detection result input from the sensor 20. Be prepared to do it.

As in the first embodiment, the sensor 20 is not limited to the vibration sensor, but is a temperature sensor that detects the chemical solution S by measuring the temperature, and hydrogen that detects the chemical solution S by measuring the hydrogen ion index. It may be an ion index sensor, an oxidation-reduction potential sensor that detects the chemical solution S by measuring the oxidation-reduction potential, an electric conductivity sensor that detects the chemical solution S by measuring the electric conductivity, or the like. Further, the sensor 20 is not one of a vibration sensor, a temperature sensor, a hydrogen ion index sensor, an oxidation-reduction potential sensor, and an electric conductivity sensor, and a plurality of sensors may be used in combination.
Further, as in the first embodiment, the positions of the sensors on the ground insertion board 7 may be such that a plurality of sensors may be arranged at intervals in the extending direction of the elongated holes, or at least one of the sensors. The portions may be arranged at the same position in the extending direction of the elongated hole without being spaced apart from each other.

In the second step, after the first step, when the ground improvement body T is created in the ground, the chemical solution S discharged by the sensor 20 mounted on the ground insertion board 7 is detected, and the chemical solution S is detected in the ground based on the detection result. The filling state of the chemical solution S is determined.
Specifically, after the pipe rod 1 is inserted to a predetermined depth in the ground, as shown in FIG. 11, the chemical liquid S is discharged from the pipe rod 1 and this is performed several times upward to improve the ground. Create T. When the ground improvement body T is created, vibration is measured by a plurality of sensors 20 mounted on the ground insertion board 7.
Subsequently, the vibration measured by the plurality of sensors 20 is input to the management device 8 as a detection result. In the management device 8, the magnitude (amplitude) of the vibration measured by a predetermined arithmetic process is compared with a predetermined magnitude to determine the filling state of the chemical solution S in the ground, and the determination result (the chemical solution S of the chemical solution S) is determined. The filling state) is displayed on the display 25.

As a result, the operator can determine the filling state of the chemical solution S in the ground in real time by looking at the determination result displayed on the display 25 of the management device 8.
Further, since the filling state of the chemical solution S is displayed on the display 25 in real time, the operator can further discharge the chemical solution S if, for example, the chemical solution S is found to be insufficiently filled, thereby designing. A street ground improvement body T can be created.

As described above, according to the present embodiment, the ground insertion board 7 is installed in the ground (first step), and the chemical solution S is used by the sensor 20 mounted on the ground insertion board 7 when the ground improvement body T is created. By detecting and determining the filling state of the chemical solution S in the ground (second step), whether or not the ground improvement body T is in the shape as designed, and the filling of the chemical solution S in the ground The state can be determined in real time, and the finished shape of the ground improvement body T to be created can be appropriately managed. In addition, it is possible to manage the finished shape of the ground improvement body T to be created by simply installing the ground insertion board 7 in the ground, and as a result, the ground improvement body T as designed can be inexpensively done without any trouble. Can be created and the construction cost can be reduced.

Further, by forming the ground insertion board 7 with a non-permeable material having low rigidity and hardly transmitting vibration and heat, for example, when a vibration sensor or a temperature sensor is used for the sensor 20, vibration or vibration occurs in the ground insertion board 7. It becomes difficult for heat to be transmitted, and it is not affected by vibration or heat from other places. As a result, the sensor 20 can satisfactorily detect the chemical solution S, and can determine the filling state of the chemical solution S with high accuracy.

Further, in the second embodiment, when the chemical liquid S is discharged into the ground to form the ground improvement body T, the pipe rod 1 is inserted into the ground and the chemical liquid S is discharged from the pipe rod 1. Instead of the pipe rod 1, the ground insertion board 37 may be used to discharge the chemical solution S.

That is, as shown in FIG. 12, the ground insertion board 37 has an elongated plate shape made of a water-impermeable material having low rigidity and hardly transmitting vibration and heat, like the ground insertion board 7. A plurality of elongated holes 11 extending in the longitudinal direction are provided in the plate thickness, but the sensor 20 is not mounted in the elongated holes 11, and only an opening 14 is formed in each elongated hole 11. To.
As a result, in the ground insertion board 37 installed in the ground, the chemical S is injected into the predetermined elongated hole 11 and the chemical solution S is discharged into the ground from the opening 14 formed in the elongated hole 11. A ground improvement body T can be created in the ground.

Further, when the chemical liquid S is discharged using the ground insertion board 37, the chemical liquid S is discharged into the ground by mounting the sensor 20 for detecting the discharged chemical liquid S on the ground insertion board 37 that discharges the chemical liquid S. The ground insertion board 37 for creating the ground improvement body T and the ground insertion board 7 for determining the filling state of the chemical solution S in the ground by mounting the sensor 20 can be combined.

For example, as shown in FIG. 13, only the openings 14 for discharging the chemical solution S are formed in some of the plurality of elongated holes 11 of the ground insertion board 37, and the other elongated holes 11 are formed in two upper and lower positions. Each sensor 20 is attached.
As a result, when the chemical solution S is discharged into the ground to form the ground improvement body T, the chemical solution S is discharged from the predetermined elongated hole 11 of the ground insertion board 37, and the chemical solution S is discharged into two places above and below the other elongated holes 11. It is possible to detect the discharged chemical solution S by the mounted sensor 20 and determine the filling state of the chemical solution S in the ground.

By combining the ground insertion board 37 that discharges the chemical solution S to create the ground improvement body T and the ground insertion board 7 that attaches the sensor 20 and determines the filling state of the chemical solution S into the ground, the ground is in the ground. The ground insertion board 37 to be installed in the ground can be made into one, which requires only one installation work of the ground insertion board 37 in the ground, so that the work process can be reduced and used. Since there is only one ground insertion board 37, the number of parts used can be reduced.

1 ... Pipe rod, 2 ... Construction machine, 3 ... Mast, 4 ... Elevating device, 5 ... Rotating device, 6 ... Injection port, 7 ... Ground insertion board, 8 ... Management device, 11 ... Long hole, 12 ... Core material, 13 ... Sheet material, 14 ... Opening, 15 ... Anchor, 20 ... Sensor, 21 ... Cable, 25 ... Display, 27 ... Insert tube, 28 ... Opening, 30 ... Construction machine, 31 ... Aircraft, 32 ... Boom, 33 ... attachment, 37 ... ground insertion board, 40 ... tube rod, 41 ... injection port.

Claims (6)

It is a method of creating and managing a ground improvement body that is created by injecting a hardened material into the ground at high pressure or discharging a chemical solution.
The first step of installing a ground insertion board equipped with a sensor that detects the injected hardened material or the discharged chemical solution in the ground where the ground improvement body is created, and
After the first step, when constructing a ground improvement body in the ground, the cured material sprayed or the discharged chemical solution is detected by the sensor mounted on the ground insertion board, and the cured material or the cured material into the ground is detected based on the detection result. It has a second step of determining the filling state of the chemical solution, and
The ground insertion board is made of a non-permeable material that has low rigidity and does not easily transmit vibration and heat, and is a plate with multiple elongated holes extending in the longitudinal direction, and the sensor is placed inside the elongated holes. A method for creating and managing a ground improvement body, which comprises arranging a plurality of sensors in one elongated hole at intervals in the longitudinal direction of the ground insertion board. In the method for creating and managing a ground improvement body according to claim 1,
A method for creating and managing a ground improvement body, which comprises a step of discriminating the filling state of a cured material or a chemical solution with a management device based on a detection result of a sensor and displaying the discrimination result on a display device. In the method for creating and managing a ground improvement body according to claim 1 or 2.
The sensor is a vibration sensor that detects the cured material or chemical solution by measuring vibration, a temperature sensor that detects the cured material or chemical solution by measuring temperature, and detects the cured material or chemical solution by measuring the hydrogen ion index. At least one of a hydrogen ion index sensor, an oxidation-reduction potential sensor that detects a cured material or chemical solution by measuring an oxidation-reduction potential, and an electric conductivity sensor that detects a cured material or chemical solution by measuring electrical conductivity. A method of creating and managing a ground improvement body, which is characterized by being. In the method for creating and managing a ground improvement body according to any one of claims 1 to 3.
A method for creating and managing a ground improvement body, characterized in that sensors arranged in a plurality of elongated holes are arranged at intervals in the extending direction of the elongated holes. In the method for creating and managing a ground improvement body according to any one of claims 1 to 3.
A method for creating and managing a ground improvement body, characterized in that at least a part of sensors arranged in a plurality of elongated holes are arranged at the same position without being spaced apart from each other in the extending direction of the elongated holes. In the method for creating and managing a ground improvement body according to any one of claims 1 to 5.
When the ground insertion board is installed in the ground in the first step, the orientation of the ground insertion board is such that the surface of the ground insertion board on the side where the injected hardened material or the discharged chemical solution is detected is the hardened material at the time of forming the ground improvement body. A method for creating and managing a ground improvement body, characterized in that the ground is orthogonal to the injection direction or the discharge direction of the chemical solution.

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