JP6661230B2 - Chemical solution injection system and chemical solution injection method using the same - Google Patents

Description

The present invention uses A chemical and B liquid injection tube to inject the B liquid medicine into the ground using A liquid injection pipe, chemical liquid injection system to solidify improved ground by mixing chemical A chemical and B chemical and it It relates to the chemical solution injection method used.

  Conventionally, as a chemical solution injection method (penetration injection method) for infiltrating and injecting a chemical solution into the ground, for example, a permeation injection material L stored in a storage tank 52 is injected into the ground G from an injection port 51a arranged in the ground G. (See FIG. 6). Here, FIG. 6 is a diagram showing a conventional chemical solution injection system. This chemical solution injection method includes a flow meter 53 for measuring the flow rate of the infiltration injection material L flowing through the injection line 51, a pump P for sucking the infiltration injection material L from the inside of the tank 52 and pumping it into the ground G, A flow control valve for adjusting the flow rate of the infiltration material L flowing through the base 51; and a pressure sensor 55 for detecting a change in injection pressure when the infiltration material L is injected into the ground G. The flow control valve 54 is controlled based on the detected injection pressure. As the control, for example, when the injection pressure detected by the pressure sensor 55 is high, the flow rate of the permeated injection material L flowing through the injection line 51 is reduced by decreasing the opening of the flow control valve 54. Thereby, the injection amount of the infiltration injection material L injected into the ground G decreases, and the injection pressure of the infiltration injection material L decreases. On the other hand, when the injection pressure detected by the pressure sensor 55 is low, the control device 56 is controlled so as to increase the opening of the flow control valve 54 and increase the flow rate of the permeated injection material L flowing through the injection line 51. Thereby, the injection amount of the permeation injection material L injected into the ground G increases, and the injection pressure of the permeation injection material L increases. That is, the control device 56 increases or decreases the injection amount of the penetrating injection material L into the ground G in accordance with the change in the injection pressure of the penetrating injection material L, and always keeps the injection pressure of the penetrating injection material L constant. there were.

  By infiltrating with the infiltration injection device 50, in the sand layer having a high osmotic resistance pressure, at first, it is difficult for the infiltration injection material L to penetrate into the layer. Immediately, the pressure sensor 55 detects the change in the injection pressure, and the control device 56 controls the flow control valve 54 to decrease the injection amount of the infiltration injection material L and lower the injection pressure of the infiltration injection material L. Make the pressure constant. As a result, the penetrating injection material L penetrates uniformly into the layer without causing splitting in the layer due to the injection of the penetrating injection material L. On the other hand, in the sand layer having a low osmotic resistance pressure, at first, the infiltration injection material L easily penetrates into the layer, so that the injection pressure of the infiltration injection material L becomes low. Is detected, the control device 56 controls the flow control valve 54 to increase the injection amount of the permeation injection material L, and increases the injection pressure of the permeation injection material L to a constant pressure. As a result, a sufficient amount of the infiltration material L is injected into the sand layer and permeates (for example, Patent Document 1).

JP 2003-342945 A (prior art)

  However, in the conventional chemical liquid injection method, the infiltration material L can be injected at an injection amount corresponding to the permeation resistance pressure of the sand layer in the ground G, and can be uniformly infiltrated into the ground G. In the injection method, there is a possibility that a part where the chemical solution has not penetrated exists in the ground. As described above, if there is a place where the chemical solution has not penetrated, there is a problem that the ground where the chemical solution has not penetrated does not solidify, resulting in incomplete ground improvement.

  The present invention has been made in view of the above problems, and solidifies and improves the entire ground in the ground improvement plan range by solidifying the ground in the ground improvement plan range that has not been solidified with the mixed chemical liquid of the A chemical solution and the B chemical solution. It is an object of the present invention to provide a drug solution injection system capable of performing the above-described method and a drug solution injection method using the same.

In order to solve the above problems and achieve the above object, according to a first aspect of the present invention, an A chemical solution is injected into a ground using a A chemical solution injection tube and a B chemical solution is injected into a ground using a B chemical solution injection tube. and, a liquid injection system to solidify improved ground by mixing chemical a chemical and B chemical, and a liquid storage tank for storing a chemical, and B liquid storage tank for storing the B chemical, the side wall inside a hollow A plurality of slits are provided, and a plurality of slits are inserted into the ground within the area of the ground improvement plan and A chemical solution injection pipes into which the A liquid is fed into the hollow. are a plurality of inserted into the ground of the planning area, and B liquid injection tube hollow interior liquid B is fed, a solution Komu Ri feed the a chemical a solution storage tank to the a liquid injector tube via the a liquid injection pipe Compressor and liquid B storage tank And B liquid compressor Komu Ri feed chemical to B liquid injection pipe via the B liquid injection pipe, ground improvement plan range of penetration values to injected A chemical and B chemical solution mixed mixed chemical liquid in the soil in the ground Effect detection detecting body for detecting the A and B chemicals injected into the ground from the slits of the A liquid injection pipe and the B liquid injection pipe detected by the injection effect confirmation detection body A chemical liquid infiltration detecting unit for detecting whether the infiltration value of the mixed chemical liquid into the ground is within a predetermined reference value, and a liquid chemical infiltration detecting unit that determines the infiltration value of the mixed chemical liquid of the A chemical liquid and the B chemical liquid into the ground by a predetermined standard If it is detected to be not within the value, a liquid a liquid injector tube near injection effect confirmation detection body entering values into the ground is detected as not within predetermined reference value of the mixed chemical solution a chemical and B chemical B solution a chemical and B liquid injection pipe in the storage tank It is characterized in that it has a control device for controlling so as to increase the amount Komu Ri send a B chemical distillate tank.

According to the present invention, penetration values into the ground of the mixed chemical solution A chemical and B chemical is A liquid storage tank to the A liquid injector tube near injection effect confirmation detector that is detected as not within predetermined reference value since increasing the amount Komu Ri send a B chemical liquid in the B liquid storage tank a chemical and B liquid injector tube, the ground of ground improvement plan range unsolidified be solidified by mixing chemical a chemical and B chemical It is possible to solidify and improve the ground of the entire ground improvement plan area.

  According to a second aspect of the present invention, there is provided the chemical liquid injection system according to the first aspect, wherein the A liquid compressor and the B liquid compressor are one compressor.

According to a third aspect of the present invention, there is provided the chemical liquid injection system according to the first aspect, wherein the control device is configured to set a value at which the infiltration value of the mixed chemical liquid of the A chemical liquid and the B chemical liquid into the ground is a predetermined reference value. a plurality of a liquid injection pipe close to the detected injection effect confirmed detector is not the inner to increase the amount of feeding the B chemical liquid in the B liquid storage tank a chemical and B liquid injector tube a liquid storage tank It is characterized by controlling.

In order to solidify the ground in the non-solidified ground improvement plan area, the A chemical liquid injected from the A chemical liquid injection pipe and the B liquid injected from the B chemical liquid injection pipe around the ground in the non-solidified ground improvement plan area are used. The mixed chemical solution of the chemical solution may be permeated. However, if the mixed chemical solution is injected from the A chemical liquid injection pipe and the B chemical liquid injection pipe in the peripheral areas that are too wide, unnecessary mixed chemical liquid that is originally unnecessary is injected. According to the present invention, A chemical and B of A liquid storage tank penetration value into the soil mixing chemical solution into a plurality of A liquid injection pipe close to the injection effect confirmation detector that is detected as not within predetermined reference value since the liquid injection pipe is controlled to increase the amount Komu Ri send a B chemical B solution storage tank, with the injection of or unwanted mixing chemical solution not fed can be reduced as much as possible, we have solidified Solid ground can be solidified reliably.

According to a fourth aspect of the present invention, there is provided a chemical injection method using the chemical injection system according to the first aspect, wherein an A chemical injection pipe having a hollow inside and a plurality of slits provided on a side wall. used with a chemical and B liquid injector tube B chemical solution injected into the ground in the ground and, a liquid injection method for solidifying improved ground by mixing chemical a chemical and B chemical, a liquid injection pipe and An injection pipe insertion process of inserting a plurality of B chemical injection pipes into the ground within the ground improvement plan area, and a ground improvement plan for an injection effect confirmation detecting body that detects a penetration value of a mixed chemical liquid of the A chemical liquid and the B chemical liquid into the ground. scope and injection effect confirmed detector inserting step of inserting into the ground of the a liquid injection pipe inserted into the ground by the injection tube insertion step to inject B chemical solution a chemical and B liquid injection tube, the a liquid injection pipe A medicine into the ground from the slit in the side wall And from the side wall of the slit of the B liquid injection tube B drug solution is injected into the ground, a liquid injection step of infiltrating the mixed chemical solution A chemical and B chemical into the ground, by injection effect confirmed detection of A chemical and B chemical A chemical liquid infiltration value detecting step of detecting an infiltration value of the mixed chemical liquid into the ground, and whether a penetration value of the mixed chemical liquid of the A chemical liquid and the B chemical liquid detected in the chemical liquid infiltration value detecting step into the ground is within a predetermined reference value. When the infiltration value into the ground of the mixed chemical solution of the A chemical solution and the B chemical solution is detected not to be within the predetermined reference value by the chemical solution infiltration standard value detection step of detecting the Ri penetration value into the soil mixing chemical chemical and B chemical liquid feeding the B chemical solution a chemical and B liquid injection tube to the a liquid injector tube near injection effect confirmation detector that is detected as not within predetermined reference value And a chemical solution increasing step for increasing the amount of It is.

According to the present invention, the injection effect confirmation detecting body for detecting the infiltration value of the mixed chemical solution of the A chemical solution and the B chemical solution into the ground is inserted into the ground within the ground improvement plan range, and the A is detected by the chemical solution infiltration reference value detection step. When it is detected that the infiltration value of the mixed solution of the chemical solution and the B solution into the ground is not within the predetermined reference value, the infiltration value of the mixed solution of the A solution and the B solution into the ground is not within the predetermined reference value. since increasing the amount Komu Ri send a B chemical solution a chemical and B liquid injection tube to the a liquid injector tube near the detected injection effect confirmed detection body and the ground of the ground improvement planning area that is not solidified with a chemical The solidification can be performed by the mixed chemical liquid of the B chemical liquid, and the ground in the entire ground improvement plan area can be solidified and improved.

According to a fifth aspect of the present invention, there is provided a drug solution injecting step according to the fourth aspect, wherein the injecting tube inserting step includes the steps of inserting the A solution injecting tube and the B solution injecting tube at predetermined intervals vertically and horizontally. And is inserted into the ground within the ground improvement plan area.

According to the present invention, since at intervals defined aspect advance A liquid injection tube and B liquid injection pipe inserted into the soil of the ground improvement planning area, note input to the A chemical and B chemical solution mixed evenly The ground can be solidified evenly and evenly.

  According to a sixth aspect of the present invention, there is provided the chemical injection method according to the fifth aspect, wherein the step of detecting the infiltration reference value within the chemical liquid infiltration reference value comprises the steps of detecting the A chemical liquid and the B chemical liquid detected by the injection effect confirmation detecting body. It is characterized in that it is detected whether or not the pH value of the mixed chemical solution of the A chemical solution and the B chemical solution is within a predetermined reference value based on the pH value of the mixed chemical solution.

According to a seventh aspect of the present invention, there is provided a chemical liquid injection method according to a fifth aspect,
In the chemical liquid injection step, an A chemical liquid colored into the ground through a slit on the side wall of the A chemical liquid injection pipe and a colored B chemical liquid colored into the ground through a slit on the side wall of the B chemical liquid injection pipe are injected. The in-value detection step is to detect whether the coloring value of the mixed drug solution of the A drug solution and the B drug solution is within a predetermined reference value by coloring the mixed drug solution of the A drug solution and the B drug solution detected by the injection effect confirmation detecting body. It is characterized by the feature.

  According to an eighth aspect of the present invention, there is provided the chemical liquid injection method according to the fifth aspect, wherein the step of detecting the chemical liquid infiltration reference value includes the steps of detecting the A chemical liquid and the B chemical liquid detected by the injection effect confirmation detecting body. It is characterized in that it is detected whether or not the viscosity value of the mixed chemical liquid of the A chemical liquid and the B chemical liquid is within a predetermined reference value based on the viscosity of the mixed chemical liquid.

  As described above, according to the chemical solution injection system of the present invention and the chemical solution injection method using the same, the ground in the ground improvement plan area that has not been solidified is solidified with the mixed chemical solution of the chemical solution A and the chemical solution B, thereby improving the ground improvement plan. The entire ground in the area can be solidified and improved.

It is a figure which shows the chemical | medical-solution injection | pouring system used for the chemical | medical-solution injection | pouring method in one Embodiment of this invention. (A) It is a side view of the chemical | medical solution injection pipe used for the chemical | medical solution injection | pouring system in one Embodiment of this invention. (B) It is a figure which shows the AA cross section of FIG.2 (a). (C) It is a figure which shows the BB cross section of FIG.2 (a). (A) It is a top view which shows the chemical | medical-solution injection | pouring pipe | tube in one Embodiment of this invention, and the position where an injection effect confirmation detection body is inserted. (B) It is a figure which shows the XX and YY range of FIG.3 (a). It is a flowchart which shows the construction procedure of the chemical | medical solution injection | pouring method in one Embodiment of this invention. B of Figure 2 of the liquid injection pipe modification 3 of the present invention (a) - is a diagram showing a B cross-section. It is a figure showing the conventional medical fluid injection system.

  Hereinafter, an embodiment of a chemical injection method using the chemical injection system of the present invention will be described with reference to the drawings. FIG. 1 is a diagram showing a chemical solution injection system used in a chemical solution injection method according to one embodiment of the present invention.

As shown in FIG. 1, the chemical liquid injection system includes: A chemical liquid injection pipe 1a, B chemical liquid injection pipe 1b, A liquid storage tank 2, B liquid storage tank 3, A liquid compressor 4, and B liquid compressor 5. , A glass electrode pH meter 6 (injection effect confirmation detecting body), a chemical liquid intrusion detecting section 7, and a control device 8.

As will be described later, the A liquid injection tube 1a and the B liquid injection tube 1b are closed at their ends by a lid 9, are hollow inside, and have 80 slits 10 formed in the side wall (see FIG. 2). In the present embodiment, the glass electrode pH meter 6 is used as the injection effect confirmation detector, but the present invention is not limited to this, and the mixed chemical solution of the A chemical solution and the B chemical solution injected into the ground is injected into the ground. As long as it can detect the infiltration value into the gas, other injection effect confirmation detectors including modified examples described later may be used.

  The solution A storage tank 2 is a tank for storing the solution A, and the solution B storage tank 3 is a tank for storing the solution B. The A solution and the B solution are not solidified by themselves, but are solidified by mixing the A solution and the B solution. In the present embodiment, a main material is used as the A chemical solution, and a hardening material adjusting material is used as the B chemical solution.

The A liquid compressor 4 is a compressor that sends the A liquid in the A liquid storage tank 2 to the A liquid injection pipe 1a at a low pressure through the A liquid injection pipe 11, and the B liquid compressor 5 discharges the B liquid in the B liquid storage tank 3. This is a compressor that sends the solution at a low pressure to the B solution injection tube 1b via the B solution injection pipe 12. Specifically, A chemical and B liquid storage tank 3 in the B agent A liquid storage tank 2 A liquid injection pipe 1a at 1.2 atm pressure (low pressure), is fed to the B liquid injector tube 1b. In the present embodiment, the A liquid compressor 4 for feeding the A chemical liquid to the A chemical liquid injection pipe 1a and the B liquid compressor 5 for feeding the B chemical liquid to the B chemical liquid injection pipe 1b are separate compressors, but are not limited thereto. A single compressor may be used to feed the A solution in the A solution storage tank 2 and the B solution in the B solution storage tank 3 to the A solution injection pipe 1a and the B solution injection pipe 1b at low pressure.

The chemical infiltration detecting section 7 detects the mixed chemical liquid of the A chemical liquid and the B chemical liquid injected into the ground through the slits 10 of the A chemical liquid injection pipe 1a and the B chemical liquid injection pipe 1b detected by the glass electrode pH meter 6 into the ground. It is to detect whether the pH value (penetration value) is within a predetermined reference value. Specifically, the chemical liquid intrusion detection unit 7 detects whether the pH value of the mixed chemical liquid of the A chemical liquid and the B chemical liquid in the ground detected by the glass electrode pH meter 6 is within the range of 6 or less. Here, as will be described later, since four glass electrode pH meters 6 are inserted in the ground in the ground improvement plan area 13, each of the glass electrode pH meters 6 is detected by the glass electrode pH meter 6. It is detected whether the pH value of the mixed chemical solution of the chemical solution and the B solution is within the range of 6 or less. In addition, in this embodiment, although it was detected whether the pH value of the mixed chemical solution of the A chemical solution and the B chemical solution was within the range of 6 or less, the present invention is not limited to this, and the pH value was within the range of 6-8 or 7-8. May be detected, or may be detected within another pH value range. Here, in the present embodiment, the glass electrode pH meter 6 is inserted into a pipe having the same shape as the A chemical liquid injection pipe 1a and the B chemical liquid injection pipe 1b, and is inserted into the ground in the ground improvement plan area 13. .

When the pH value of the mixed chemical solution detected by the glass electrode pH meter 6 is not within the range of 6 or less by the chemical liquid infiltration detecting unit 7, the control device 8 sets the pH value of the mixed chemical solution to 6 or less. The amount of the A chemical solution in the A liquid storage tank 2 and the B chemical solution in the B liquid storage tank 3 sent to the B chemical solution injection pipe 1b at a low pressure into the A chemical solution injection pipe 1a around the glass electrode pH meter 6 which is detected as not being inside. Is controlled to increase. The specific contents will be described later.

Next, the A liquid injection tube 1a and the B liquid injection tube 1b used in the liquid injection system of the present invention will be described. FIG. 2A is a side view of a drug solution injection pipe used in the drug solution injection system according to one embodiment of the present invention, and FIG. 2B is a diagram showing a cross section taken along line AA of FIG. FIG. 2C is a diagram showing a BB cross section of FIG. 2A.

As shown in FIG. 2, the A liquid injection tube 1 a and the B liquid injection tube 1 b are circular hollow tubes having a length H of about 4.0 m, a cross section of an outer diameter D of 48 mm, and an inner diameter of d 40 mm. And the rear end is open. In this embodiment, circular hollow tubes having a length H of about 4.0 m, a cross section of an outer diameter D of 48 mm, and an inner diameter of d 40 mm are used as the A liquid injection tube 1a and the B liquid injection tube 1b. Alternatively, a circular hollow tube having a length of about 4.0 m to 5.5 m, a cross section of an outer diameter of 48 mm to 50 mm, and an inner diameter of 40 mm to 42 mm may be used.

On the side walls of the A solution injection pipe 1a and the B solution injection pipe 1b, there are formed slits 10 which are straight cuts in the vertical direction. The slits 10 are provided in plural numbers with a predetermined length, respectively, as viewed from the longitudinal direction of the chemical liquid injection pipe 1 from the distal ends of the chemical liquid injection pipes 1 (A chemical liquid injection pipe 1a, B chemical liquid injection pipe 1b) . Specifically, four slits 10 are formed at substantially equal intervals in the circumferential direction, and 20 rows of four slits 10 in the circumferential direction are formed at substantially equal intervals in the vertical direction. In the present embodiment, four slits 10 on the side wall of the chemical liquid injection tube 1a and B are provided in the circumferential direction and 20 rows in the vertical direction. The number in the circumferential direction and the number of columns in the vertical direction may be different, such as 2 to 4 at equal intervals, 15 to 20 at substantially equal intervals in the vertical direction, and the like. It is not necessary to form them at equal intervals.

A liquid injection pipe 11 for injecting A liquid into A liquid injection pipe 1a, B liquid injection pipe for injecting B liquid into B liquid injection pipe 1b, at the rear end of A liquid injection pipe 1a and B liquid injection pipe 1b. 12 are attached (see FIG. 1).

Next, a description will be given of the positions where the A liquid injection pipe 1a, the B liquid injection pipe 1b, and the glass electrode pH meter 6 used in the liquid injection system of the present invention are inserted into the ground improvement plan area 13. FIG. 3A is a top view showing a position where a chemical injection tube and a glass electrode pH meter are inserted according to an embodiment of the present invention, and FIG. 3B is a view showing XX and Y in FIG. 3A. It is a figure which shows the -Y range.

As shown in FIG. 3A, 36 A liquid injection pipes 1a and B liquid injection pipes 1b are inserted into the ground of the ground improvement plan area 13 at predetermined intervals in the vertical and horizontal directions. Specifically, A liquid injector tube 1a, B liquid injection tube 1b is spaced equidistant horizontal and vertical 2m, A liquid injection pipe 1a and B liquid injection pipe 1b is inserted vertically and horizontally from each other. In this way, the A chemical injection pipe 1a and the B chemical injection pipe 1b are spaced at equal intervals of 2 m vertically and horizontally, and the A chemical injection pipe 1a and the B chemical injection pipe 1b are arranged in a grid pattern in the vertical and horizontal directions. The liquid medicines A and B injected at a low pressure are evenly mixed, so that the ground can be solidified evenly and uniformly. In the present embodiment, the A liquid injection tube 1a and the B liquid injection tube 1b are inserted at equal intervals of 2 m in length and width, but the invention is not limited thereto. The A liquid injection tube 1a and the B liquid injection tube 1b may be vertically and horizontally inserted in a lattice pattern and may not be equally spaced, and the A liquid injection tube 1a and the B liquid injection tube 1b may be vertically and horizontally connected. It does not have to be inserted. Further, in the present embodiment, 36 are inserted in the ground of the ground improvement plan area 13, but the present invention is not limited to this, and a plurality of pieces corresponding to the size of the ground improvement plan area 13 may be inserted.

As shown in FIG. 3 (a), the glass electrode pH meter 6 is located between the upper first and second tubes or between the lower first and second tubes of the drug solution injection tube 1 and slightly to the right or to the left of the right end. A total of four on the left are inserted. The position where the glass electrode pH meter 6 is inserted is not limited to the above-mentioned position, and is slightly outside the outer periphery connecting the chemical injection pipes 1 outside the chemical injection pipe 1 inserted into the ground improvement plan range 13 with a line. In addition, the position where the glass electrode pH meter 6 is inserted may be another position. In particular, in order to more accurately detect the infiltration value of the mixed chemical solution of the A chemical solution and the B chemical solution injected into the ground in the ground improvement plan area 13, more glass electrode pH meters 6 are inserted into the ground. do it. Here, as described above, in the present embodiment, the glass electrode pH meter 6 is inserted into a pipe having the same shape as the A chemical liquid injection pipe 1a and the B chemical liquid injection pipe 1b. Has been inserted.

  Next, a construction procedure by a chemical solution injection method according to an embodiment of the present invention will be described with reference to FIG. FIG. 4 is a flowchart showing a construction procedure of the chemical solution injection method according to one embodiment of the present invention.

First, in S1, a drilling step is performed. In this drilling step, drilling is performed at the position where the chemical is to be injected. Specifically, ground drilling is performed while discharging water from a water injection hole (not shown) at the tip of a ground drilling tube (not shown) via a drilling swivel (not shown) from a water supply source (not shown). A pipe (not shown) is inserted into the ground. The drilling step is performed on all of the chemical solution insertion holes 14 and the pH meter insertion holes 15 into which the plurality of A solution injection tubes 1a, B solution injection tubes 1b, and the glass electrode pH meter 6 shown in FIG. FIG. 3 (b)). Here, the ground to be solidified by injecting the chemical is a soft ground, so that the ground can be easily drilled. In the present embodiment, drilling is performed using a ground drilling pipe (not shown) dedicated to drilling. However, the present invention is not limited to this, and drilling of the ground may be performed using the chemical injection pipe 1. . Then, the process proceeds to S2.

In S2, it is determined whether or not all the insertion holes (the chemical solution insertion hole 14 and the pH meter insertion hole 15) into which the A solution injection tube 1a, the B solution injection tube 1b, and the glass electrode pH meter 6 are inserted have been drilled. If the insertion hole is not drilled, "NO" is determined, and the insertion hole is further drilled in S1. Then, the processing of S2 → S1 → S2 is performed until all the insertion holes are drilled. If all the insertion holes have been drilled in S2, it is determined as "YES", and it is determined that the drilling has been completed, and the process proceeds to S3.

In S3, an injection tube insertion step is performed. In the injection pipe insertion step, 36 A liquid injection pipes 1a and B liquid injection pipes 1b are inserted into the ground within the ground improvement plan area 13. Specifically, the A liquid injection pipe 1a and the B liquid injection pipe 1b are suspended by a crane, and the A liquid injection pipe 1a and the B liquid injection pipe 1b are vertically and horizontally inserted into the liquid insertion hole 14 drilled in the drilling step. It is inserted into the ground of the improvement plan area 13. As described above, when the A liquid injection pipe 1a and the B liquid injection pipe 1b are inserted into the ground, the soft soil is formed from the slits of the A liquid injection pipe 1a and the B liquid injection pipe 1b into the A liquid injection pipe 1a and the B liquid liquid. It enters the injection tube 1b. In the present embodiment, A liquid injection pipe 1a, but the B liquid injection pipe 1b hung by a crane and inserted into the liquid medicine insertion hole 14 is not limited to this, manually A liquid injector tube 1a by an operator, The B solution injection tube 1b may be inserted into the solution insertion hole 14. As a result, 36 chemical injection pipes 1 are inserted into the ground of the ground improvement plan area 13 at predetermined vertical and horizontal intervals (equal intervals of 2 m in horizontal and vertical directions) (see FIG. 3A). Then, the process proceeds to S4.

In S4, a glass electrode pH meter insertion step (injection effect confirmation detector insertion step) is performed. In this glass electrode pH meter insertion step, four glass electrode pH meters 6 (injection effect confirmation detectors) are inserted into the ground. Specifically, the glass electrode pH meter 6 is suspended by a crane, and is inserted into a pipe having the same shape as the A chemical liquid injection pipe 1a and the B chemical liquid injection pipe 1b inserted into the pH meter insertion hole 15. In the present embodiment, the piping having the same shape as the A liquid injection pipe 1a and the B liquid injection pipe 1b and the glass electrode pH meter 6 are suspended by a crane and inserted into the pH meter insertion hole 15, but the invention is not limited thereto. Alternatively, the operator may manually insert the piping having the same shape as the A liquid injection pipe 1a and the B liquid injection pipe 1b and the glass electrode pH meter 6 into the pH meter insertion hole 15. Thus, four glass electrode pH meters 6 are inserted into the ground in the ground improvement plan area 13 (see FIG. 3A). Then, the process proceeds to S5. In this embodiment, the glass electrode pH meter 6 is inserted into the pH meter insertion hole 15 by being inserted into a pipe having the same shape as the A chemical liquid injection pipe 1a and the B chemical liquid injection pipe 1b, but is not limited thereto. The electrode pH meter 6 alone may be inserted into the pH meter insertion hole 15. Here, the glass electrode pH meter 6 is a meter that detects a pH value (penetration value) of a mixed chemical liquid of the A chemical liquid and the B chemical liquid described below into the ground.

In S5, a chemical solution injection step is performed. In this liquid injection step, the A liquid is injected into the A liquid injection pipe 1a inserted into the ground in the injection pipe insertion step, and the B liquid is injected into the B liquid injection pipe 1b. As a result, the A chemical solution and the B chemical solution are injected into the ground through the slits 10 on the side walls of the A chemical liquid injection pipe 1a and the B chemical liquid injection pipe 1b, and the mixed chemical liquid of the A chemical liquid and the B chemical liquid penetrates into the ground. here. Since the ground into which the A liquid injection pipe 1a and the B liquid injection pipe 1b are inserted is a soft ground, the A liquid and the B liquid are easily penetrated into the ground from the slits 10 on the side walls of the liquid injection pipe 1. Further, since the mixed chemical solution of the A chemical solution and the B chemical solution requires several tens of minutes or more until it is solidified, the A chemical solution and the B chemical solution injected from the slit 10 spread while penetrating in a radial manner. Further, in the present embodiment, four slits 10 of the chemical liquid injection pipe 1 are provided at equal circumferential intervals, and 20 rows are provided at equal longitudinal intervals. The mixed drug solution of the B drug solution can be made uniform. Then, the process proceeds to S6.

In S6, a chemical liquid infiltration value detection step is performed. In the chemical liquid infiltration value detection step, it is determined whether the pH value (infiltration value) of the mixed chemical liquid of the A chemical liquid and the B chemical liquid detected by the glass electrode pH meter 6 (injection effect detection detector) into the ground is within a predetermined reference value. Is detected. Specifically, the soft ground enters into the pipe from the slit of the pipe having the same shape as the A chemical liquid injection pipe 1a and the B chemical liquid injection pipe 1b inserted into the ground, and is introduced into the pipe by the glass electrode pH meter 6. The pH value of the mixed chemical solution of the A chemical solution and the B chemical solution in the soft ground that has entered is detected. Here, the chemical infiltration value detection step is performed 30 minutes (a predetermined time) after the injection of the A chemical solution and the B chemical solution into the A chemical liquid injection pipe 1a and the B chemical liquid injection pipe 1b is stopped. . As described above, after stopping the injection of the A liquid medicine and the B liquid liquid into the A liquid liquid injection pipe 1a and the B liquid liquid injection pipe 1b, 30 minutes (predetermined time) elapses. This is for allowing the mixed chemical solution of the B chemical solution to sufficiently penetrate into the ground. Then, the process proceeds to S7.

In S7, a detection step for the inside of the chemical solution reference value is performed. In the chemical liquid infiltration reference value detection step, the chemical liquid intrusion detection unit 7 detects whether the pH value of the mixed chemical liquid of the A chemical liquid and the B chemical liquid detected by the glass electrode pH meter 6 is within 6 or less (a predetermined reference value). . Here, when the pH value of the mixed drug solution cannot be measured by the glass electrode pH meter 6, it is detected that the pH value is not less than 6 (predetermined reference value). In the present embodiment, after stopping the injection of the A solution and the B solution into the A solution injection pipe 1a and the B solution injection pipe 1b, the detection of the infiltration reference value within 30 minutes (a predetermined time) has elapsed. Although the process was performed, the present invention is not limited to this, and detection within the standard value of the chemical liquid infiltration after another time (predetermined time) such as 20 minutes or 40 minutes has elapsed according to the type of the chemical solution (the chemical solution A and the chemical solution B) The step may be performed, and the detection step for the reference value of the chemical solution may be continuously performed while the chemical solution A and the chemical solution B are injected into the chemical solution injection pipe 1a and the chemical solution injection pipe 1b. If the pH value of the mixed chemical solution of the A chemical solution and the B chemical solution detected by the glass electrode pH meter 6 is not within 6 or less (predetermined reference value), it is determined to be “NO”, and in S8, the chemical liquid increasing step is performed. Will be implemented. That is, when there is a glass electrode pH meter 6 whose pH value of the mixed chemical solution of the A chemical solution and the B chemical solution detected by the glass electrode pH meter 6 is not less than 6 (predetermined reference value), it is determined to be “NO”, By S8, a chemical solution increasing step is performed. In this chemical solution increasing step, the A chemical solution injection pipe around the glass electrode pH meter 6 where it is detected that the pH value of the mixed chemical solution of the A chemical solution and the B chemical solution in the glass electrode pH meter 6 is not less than 6 (predetermined reference value). 1a, A chemical solution and B chemical solution are fed into the B chemical injection tube 1b at a low pressure of 1.2 atm. Specifically, when the pH value of the mixed chemical solution of the A chemical solution and the B chemical solution in the glass electrode pH meter 6 is not within 6 or less (a predetermined reference value), the glass electrode pH meter 6 The A chemical solution and the B chemical solution are fed into the nine A chemical liquid injection pipes 1a and B chemical liquid injection pipes 1b close to 6 at a low pressure of 1.2 atm. As described above, the A chemical solution injection pipe 1a around the glass electrode pH meter 6 and the B chemical solution injection pipe around the glass electrode pH meter 6 where the pH value of the mixed chemical liquid of the A chemical liquid and the B chemical liquid in the glass electrode pH meter 6 are not within 6 or less (predetermined reference value). The amounts of the chemical solution A and the chemical solution B sent to 1b increase. Then, the process proceeds to S6 → S7, and S8 → S6 → S7 until the pH value of the mixed chemical solution of the A chemical solution and the B chemical solution detected by all the glass electrode pH meters 6 is within 6 or less (predetermined reference value). Is performed. In S7, for all the glass electrode pH meters 6, if the pH value of the mixed chemical solution of the A chemical solution and the B chemical solution detected by the glass electrode pH meter 6 is within 6 or less (predetermined reference value), "YES" It is determined that the liquid injection is completed, and the injection pipe pulling-up step is performed in S9, the liquid injection pipe 1 is pulled up from the insertion hole, and the liquid injection step ends. In the present embodiment, when there is a glass electrode pH meter 6 in which the pH value of the mixed drug solution of the A drug solution and the B drug solution is not within 6 or less (predetermined reference value), nine pieces near the glass electrode pH meter 6 are used. It is assumed that the A chemical solution and the B chemical solution are fed into the A chemical solution injection tube 1a and the B chemical solution injection tube 1b, however, the present invention is not limited to this, and four or sixteen A chemical solution injection tubes 1a, B close to the glass electrode pH meter 6 are used. Depending on the total number of the chemical injection pipes 1b, the number of the A chemical injection pipes 1a and the B chemical injection pipes 1b for feeding the A chemical liquid and the B chemical liquid may be set. Further, in the present embodiment, after the chemical solution injection is completed, the chemical solution injection tube 1 is pulled up from the insertion hole in the injection tube pulling step of S9, but the invention is not limited to this. You may leave it in the state inserted in the ground.

As described above, according to the liquid injection method using a chemical liquid injection system according to the present embodiment, the peripheral glass electrode pH meter 6 pH value is not within 6 below into the soil mixing chemical A chemical and B solution A Since the amount of the A chemical solution in the A liquid storage tank 2 and the B chemical solution in the B liquid storage tank 3 to be sent to the chemical solution injection pipe 1a and the B chemical solution injection pipe 1b at a low pressure is increased, The ground can be solidified by the mixed chemical liquid of the A chemical liquid and the B chemical liquid, and the ground of the entire ground improvement plan area 13 can be solidified and improved.

  The embodiments disclosed this time are to be considered in all respects as illustrative and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

(Modification 1)
Next, a first modification of the present invention will be described.

  The difference between the first modified example of the present invention and the present embodiment is that the pH value of the mixed chemical solution of the A chemical solution and the B chemical solution is measured by the glass electrode pH meter 6 (injection effect confirmation detector) in the chemical solution infiltration value detecting step of the present embodiment. (Penetration value) is detected, and in the chemical liquid penetration standard value detection step, the pH value (penetration value) of the mixed chemical liquid of the A chemical liquid and the B chemical liquid is within 6 or less (predetermined reference value) by the chemical liquid intrusion detection unit 7. In contrast, in the chemical liquid infiltration value detecting step of the first modification, the viscosity value (infiltration value) of the mixed chemical liquid of the A chemical liquid and the B chemical liquid is determined by the viscometer (injection effect confirmation detector). In the detection step within the standard value of the chemical liquid infiltration, the chemical liquid intrusion detecting section 7 sets the viscosity value (infiltration value) of the mixed chemical liquid of the A chemical liquid and the B chemical liquid within 50 Pa · s to 150 Pa · s (predetermined standard value). Is different. Hereinafter, with respect to the first modified example, the points different from the present embodiment will be described, and the description of the same points as the present embodiment will be omitted.

  In the first modification, a viscometer insertion hole is drilled in the drilling step of S1 in FIG. 4, and a viscometer (injection effect confirmation detector) is inserted into the ground by the injection effect confirmation detector insertion step of S4. You. Specifically, as in the present embodiment, four viscometers are inserted into a pipe having the same shape as the chemical liquid injection pipe 1 and inserted into the ground. As a result, the soft soil into which the mixed chemical of the A chemical liquid and the B chemical liquid has penetrated enters the effect confirmation ground extraction pipe from the slit of the pipe having the same shape as the chemical liquid injection pipe 1 outside the viscometer.

  In the chemical liquid infiltration value detection step of S6, the viscosity value (infiltration value) of the mixed chemical liquid of the A chemical liquid and the B chemical liquid is detected by the viscometer (injection effect confirmation detecting body), and in the chemical liquid infiltration reference value detection step of S7. The chemical liquid infiltration detecting section detects whether the viscosity value (infiltration value) detected in the chemical liquid infiltration value detecting step is within 50 Pa · s to 150 Pa · s (a predetermined reference value). In the present embodiment, the viscosity value is detected by a viscometer inserted into a pipe having the same shape as the chemical liquid injection pipe 1 in the ground. However, the present invention is not limited to this. The pipe may be pulled up from the ground, the soft soil that has entered the pipe may be taken out, and the viscosity value may be detected. Then, in S7, if the viscosity value of the mixed chemical solution of the A chemical solution and the B chemical solution detected by the viscometer is not within the range of 50 Pa · s to 150 Pa · s (predetermined reference value), “NO” is determined, and the process proceeds to S8. Then, a chemical solution increasing step is performed. The rest is the same as in the present embodiment, and a description thereof will be omitted. In the first modification, the viscometer detects whether the viscosity value of the mixed chemical solution of the A chemical solution and the B chemical solution is within the range of 50 Pa · s to 150 Pa · s (predetermined reference value), but is not limited thereto. May be another viscosity value such as 150 Pa · s to 300 Pa · s (predetermined reference value).

(Modification 2)
Next, a second modification of the present invention will be described.

  The difference between the modified example 2 of the present invention and the present embodiment is that the pH value of the mixed chemical liquid of the chemical liquid A and the chemical liquid B is measured by the glass electrode pH meter 6 (detection body for confirming the injection effect) in the chemical liquid infiltration value detecting step of the present embodiment. (Penetration value) is detected, and in the chemical liquid penetration standard value detection step, the pH value (penetration value) of the mixed chemical liquid of the A chemical liquid and the B chemical liquid is within 6 or less (predetermined reference value) by the chemical liquid intrusion detection unit 7. In contrast, in the chemical liquid infiltration value detecting step of the second modification, the coloring value (infiltration value) of the mixed chemical liquid of the A chemical liquid and the B chemical liquid is detected by the color measurement meter (injection effect confirmation detector). Is different from that of the first embodiment in that the chemical liquid intrusion detection unit 7 detects whether the color value (intrusion value) of the mixed chemical liquid of the A chemical liquid and the B chemical liquid is within the predetermined color value in the chemical liquid infiltration reference value detection step. Hereinafter, with respect to the modified example 2, the points different from the present embodiment will be specifically described, and the description of the same points as the present embodiment will be omitted. Here, the coloring value is a value relating to a color such as saturation.

  In the modified example 2, the effect confirmation ground extraction pipe insertion hole is drilled by the drilling step of S1 in FIG. 4, and the effect confirmation ground extraction pipe (not shown) is inserted in the ground by the injection effect confirmation detector insertion step of S4. Are inserted into Here, the effect confirmation ground extraction pipes have the same shape as the chemical liquid injection pipe 1 and are formed in four rows at substantially equal intervals in the circumferential direction and in 20 rows at substantially equal intervals in the vertical direction. As a result, the soft soil into which the mixed chemical solution of the A chemical solution and the B chemical solution has penetrated enters the effect confirmation soil extraction tube from the slit of the effect confirmation soil extraction tube.

In the chemical liquid injection step of S5, the A chemical liquid colored into the A chemical liquid injection pipe 1a inserted into the ground in the injection pipe insertion step and the B chemical liquid colored into the B chemical liquid injection pipe 1b are respectively injected.

このように、着色測定計により、地盤に浸透しているＡ薬液とＢ薬液の混合薬液の緑〜赤の間の値「ａ」と青〜黄の間の値「Ｂ」を用いて、「式１（数１）」から彩度値（ｃ）が求められる。そして、Ｓ７の薬液浸入基準値内検知工程では、薬液浸入値検出工程により検出された彩度値（着色値（浸入値））が３０〜４０（所定の基準値）内かが検知される。 In the chemical liquid infiltration value detection step of S6, the effect confirmation ground extraction pipe inserted into the ground is lifted, and the soil that has entered the lifted effect confirmation ground extraction pipe from the ground is taken out, and the coloring measurement meter (injection effect confirmation detection The chroma value (coloring value (penetration value)) of the mixed chemical solution of the A chemical solution and the B chemical solution penetrating the ground is detected by the body. Here, the saturation value (c) is detected by a colorimeter (injection effect confirmation detector). Here, the detection of the saturation value of the color meter (injection effect confirmation detector) (c) is, La B color system (the International Commission on Illumination (CIE)) using a value between the green-red a ( A negative value is closer to green, a positive value is closer to red) and a value B between blue and yellow (a negative value is closer to blue and a positive value is closer to yellow), and the detected green to red is detected. A axis representing the value a (negative value is more green, positive value is more red), and value B between blue and yellow (negative value is more blue, positive value is more yellow) It is determined from the value of the B axis using the following equation.

As described above, the coloring meter uses the value “a” between green and red and the value “ B ” between blue and yellow of the mixed chemical liquid of the A chemical liquid and the B chemical liquid that have permeated the ground to obtain “ The saturation value (c) is obtained from “Equation 1 (Equation 1)”. Then, in the chemical liquid infiltration reference value detection step in S7, it is detected whether the saturation value (coloring value (infiltration value)) detected in the chemical liquid infiltration value detection step is within 30 to 40 (predetermined reference value).

  Next, in S7, if the chroma value (coloring value (penetration value)) of the mixed chemical solution of the A chemical solution and the B chemical solution detected by the color measurement meter is not within the range of 30 to 40 (predetermined reference value), "NO" Is determined, and a chemical solution increasing step is performed in S8. The rest is the same as in the present embodiment, and a description thereof will not be repeated. In addition, in the modification 2, it was detected whether the chroma value (coloring value (penetration value)) of the mixed chemical liquid of the A chemical liquid and the B chemical liquid detected by the color measurement meter was within 30 to 40 (predetermined reference value). However, the present invention is not limited to this, and the saturation value (coloring value (penetration value)) of the mixed chemical solution may be another saturation value such as 20 to 30 (a predetermined reference value).

(Modification 3)
Next, a third modification of the present invention will be described.

The difference between the third modified example and the first modified example of the present invention is that in the chemical liquid injection step of the first modified example, the A chemical liquid is injected into the A chemical liquid injection pipe 1a inserted into the ground, and the B chemical liquid is injected into the B chemical liquid injection pipe 1b. On the other hand, in the chemical liquid injection process of the third modification, the chemical liquid injection pipe 1c (corresponding to the A chemical liquid injection pipe 1a and the B chemical liquid injection pipe 1b) inserted into the ground is different in that the A chemical liquid and the B chemical liquid are injected. . Hereinafter, with respect to the third modification, the differences from the first modification will be specifically described, and the description of the same portions as the first modification will be omitted.

In the chemical liquid injection pipe 1c of Modification 3, a partition plate 16 is provided at the center of the cross section of the A chemical liquid injection pipe 1a and the B chemical liquid injection pipe 1b (see FIG. 5). With the partition plate 16 as a boundary, in the chemical liquid injection step, the medicine A is injected into half of the liquid injection pipe 1c, and the medicine B is injected into the other half. Here, FIG. 5 B of FIG. 2 of liquid injection pipe modification 3 of the present invention (a) - is a diagram showing a B cross-section. Thus, the chemical A is injected into the ground through the two slits 10 on the side wall of the chemical injection pipe 1c, and the chemical B is injected into the ground through the other two slits 10. Then, in the chemical liquid infiltration reference value detection step, the viscosity value (penetration value) into the ground of the mixed chemical liquid of the A chemical liquid and the B chemical liquid detected by the viscometer (injection effect confirmation detecting body) is 50 Pa · s to 150 Pa · When it is detected that the value is not within s (predetermined reference value), in the chemical solution increasing step, the infiltration value of the mixed chemical solution of the A solution and the B solution into the ground is within 50 Pa · s to 150 Pa · s (predetermined reference value). Otherwise, the solution A and solution B are fed at a low pressure of 1.2 atm into the solution injection pipe 1c around the viscometer (injection effect confirmation detecting body) detected otherwise. As described above, the same effects as the effects of the first modification can be obtained by the third modification. Although the third modification has been described using the first modification, other embodiments can be applied as long as the same effects can be obtained by injecting the chemical solution A and the chemical solution B into the chemical liquid injection pipe 1c.

1 Chemical injection tube
1a A liquid injection tube
1b B chemical injection tube
1c Chemical liquid injection pipe 2 Liquid A storage tank 3 Liquid B storage tank 4 Liquid A compressor 5 Liquid B compressor 6 Glass electrode pH meter 7 Chemical liquid intrusion detector 8 Control device 9 Cover 10 Slit 11 Liquid A injection pipe 12 Liquid B injection pipe 13 Ground improvement plan area 14 Chemical solution insertion hole 15 pH meter insertion hole 16 Partition plate

Claims (8)

A drug solution injection system for injecting a drug solution A into a ground using a drug solution injection tube A and a drug solution B using a drug solution injection tube B, and solidifying and improving the ground with a mixed drug solution of the drug solution A and B,
A liquid storage tank for storing A chemical liquid,
A liquid B storage tank for storing the liquid B,
A plurality of slits are provided in the side wall with a hollow inside, a plurality of slits are inserted into the ground within the ground improvement plan area, and an A chemical solution injection pipe into which the A liquid is sent into the hollow inside,
A plurality of slits are provided on the side wall with a hollow inside, a plurality of B chemical solution injection pipes are inserted into the ground within the ground improvement plan range, and the B liquid is sent into the hollow inside,
And A liquid compressor Komu Ri sent to the A liquid injection pipe via the A injection pipe A chemical solution of the A fluid storage tank,
And B liquid compressor Komu Ri sent to the B liquid injection pipe via the B injection pipe B chemical of the B liquid storage tank,
An injection effect confirming detector for detecting a penetration value of the mixed chemical liquid obtained by mixing the A chemical liquid and the B chemical liquid injected into the ground within the ground improvement plan area into the ground,
Wherein the slit of the injection effect confirmation detecting the A liquid injection pipe which is detected by the body from the slit between A chemical solution injected into the ground the B liquid injection tube of the mixing liquid medicine injected B chemical in the soil into the soil A chemical liquid intrusion detection unit that detects whether the infiltration value of the liquid is within a predetermined reference value,
When the chemical infiltration detection unit detects that the infiltration value of the mixed chemical liquid of the A chemical liquid and the B chemical liquid into the ground is not within a predetermined reference value, the infiltration value of the mixed chemical liquid of the A chemical liquid and the B chemical liquid into the ground. Is detected not to be within a predetermined reference value. The A chemical solution in the A liquid storage tank in the A chemical liquid injection pipe around the injection effect confirmation detection body and the B chemical liquid in the B liquid storage tank in the B chemical liquid injection pipe. liquid injection system, characterized in that and a control unit for controlling so as to increase the amount Komu Ri send a.   The chemical liquid injection system according to claim 1, wherein the A liquid compressor and the B liquid compressor are one compressor. The control device may further include a plurality of the A solution injection pipes close to the injection effect confirmation detection body, which detect that the infiltration value of the mixed solution of the A solution and the B solution into the ground is not within a predetermined reference value. chemical liquid injection system according to claim 1, wherein the controller controls so as to increase the amount of feeding the B chemical of the B liquid storage tank to the a chemical and the B liquid injection pipe in the storage tank. A chemical solution is injected into the ground using the A chemical liquid injection pipe having a plurality of slits on the side walls, and the A chemical liquid and the B chemical liquid are injected into the ground using the B chemical liquid injection pipe . A chemical liquid injection method for solidifying and improving the ground with a mixed chemical liquid,
An injection pipe inserting step of inserting a plurality of the A chemical injection pipes and the B chemical injection pipes into the ground within the ground improvement plan range;
An injection effect confirmation detecting object insertion step of inserting an injection effect confirmation detecting object for detecting a penetration value of a mixed chemical solution of the A chemical solution and the B chemical solution into the ground into the ground within the ground improvement plan range;
The B liquid medicine is injected into A chemical and the B liquid injection tube to the A liquid injection pipe inserted into the ground by infusion pipe insertion step, the A from the slit of the side wall of the A liquid injection pipe into the soil chemical and the B A liquid chemical injection step in which a liquid B is injected into the ground through a slit in a side wall of the liquid injection pipe, and a mixed liquid of the liquid A and liquid B penetrates into the ground;
A chemical liquid infiltration value detecting step of detecting an infiltration value of the mixed chemical liquid of the A chemical liquid and the B chemical liquid into the ground by the injection effect confirmation detector;
A chemical infiltration reference value detection step of detecting whether or not an infiltration value of the mixed chemical liquid of the A chemical liquid and the B chemical liquid detected in the chemical liquid infiltration value detection step into the ground is within a predetermined reference value;
When the infiltration value into the ground of the mixed chemical liquid of the A chemical liquid and the B chemical liquid is detected not to be within the predetermined reference value in the chemical liquid infiltration standard value detection step, the mixed chemical liquid of the A chemical liquid and the B chemical liquid is moved into the ground. chemical increasing step of entering values increases the amount Komu Ri send a B chemical solution a chemical and the B liquid injection tube to the a liquid injection tube near the infusion effect confirmation detector that is detected as not within predetermined reference value A chemical solution injection method using the chemical solution injection system according to claim 1, comprising: 5. The chemical injection according to claim 4, wherein the injection pipe insertion step inserts the A chemical injection pipe and the B chemical injection pipe at predetermined intervals in the vertical and horizontal directions into the ground within the ground improvement plan area. Construction method.   The chemical solution infiltration reference value detection step includes a step in which the pH value of the mixed chemical solution of the A chemical solution and the B chemical solution is within a predetermined reference value based on the pH value of the mixed chemical solution of the A chemical solution and the B chemical solution detected by the injection effect confirmation detecting body. The chemical solution injection method according to claim 5, wherein the detection is performed. In the chemical liquid injection step, the A chemical liquid colored into the ground from the slit on the side wall of the A chemical liquid injection pipe and the colored B chemical liquid colored into the ground from the slit on the side wall of the B chemical liquid injection pipe ,
The chemical solution infiltration reference value detection step includes, by coloring the mixed chemical solution of the A chemical solution and the B chemical solution detected by the injection effect confirmation detection body, determining whether the coloring value of the mixed chemical solution of the A chemical solution and the B chemical solution is within a predetermined reference value. The chemical solution injection method according to claim 5, wherein the method is performed. The chemical liquid infiltration reference value detection step is performed, according to the viscosity of the mixed chemical liquid of the A chemical liquid and the B chemical liquid detected by the injection effect confirmation detecting body, whether the viscosity value of the mixed chemical liquid of the A chemical liquid and the B chemical liquid is within a predetermined reference value. The chemical solution injection method according to claim 5, wherein the method is performed.

Images