Drug injection management method
By measuring initial and final pressures and using differential pressure to determine supplemental injection amounts, the method addresses the complexity and reliability issues of chemical solution injection, ensuring accurate and efficient management through visualization of injection areas.
Patent Information
- Authority / Receiving Office
- JP · JP
- Patent Type
- Applications
- Current Assignee / Owner
- RAITO IND
- Filing Date
- 2024-11-11
- Publication Date
- 2026-05-21
AI Technical Summary
Current methods for managing chemical solution injection in ground reinforcement and water stoppage lack simplicity and reliability, as they are complex and prone to inaccuracies due to the inability to visually observe the injection process.
A method involving the measurement of initial and final pressures during chemical solution injection, calculation of differential pressure, and use of relational expressions to determine supplemental injection amounts, along with visualization of injection areas below a preset threshold, to ensure accurate and efficient chemical solution management.
Provides a simple and reliable method for controlling chemical solution injection by ensuring sufficient or insufficient injection is determined, allowing for precise supplemental injections based on differential pressure and visualization, thereby improving the reliability and efficiency of the process.
Smart Images
Figure 2026084448000001_ABST
Abstract
Description
Technical Field
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[0001] The present invention relates to a method for managing chemical solution injection.
Background Art
[0002] Currently, in ground reinforcement and water stoppage, etc., the chemical solution injection method is widely used. This method injects a chemical solution into the ground, but since the inside of the ground cannot be visually observed, a method for managing whether the injection is being properly performed is required.
[0003] As a method for managing the injection of this chemical solution, for example, there is an injection monitoring system that converts the change in the injection amount of the chemical solution over time in ground improvement into the size and color of a sphere and represents it as a 3D image (see, for example, Patent Document 1). According to this device, it is said that the construction status of ground improvement can be easily grasped.
[0004] However, this method is extremely complicated and there are concerns about the reliability of management.
Prior Art Documents
Patent Documents
[0005]
Patent Document 1
Summary of the Invention
Problems to be Solved by the Invention
[0006] Therefore, an object of the present invention is to provide a simple method for managing the injection of a chemical solution.
Means for Solving the Problems
[0007] The means for solving the above problems are as follows.
[0008] [First Means]<0000A step of measuring the initial pressure at the start of the injection of the chemical solution into the ground and the final pressure at the completion of the injection of the chemical solution into the ground, and calculating the differential pressure between the initial pressure and the final pressure, The process includes a step of determining the supplemental injection amount by substituting the calculated differential pressure into the reference differential pressure in a relational expression that shows the relationship between a pre-set reference differential pressure and the supplemental injection amount. A method for managing drug solution injection, characterized by the following features.
[0009] [Second method] When repeatedly injecting chemical solutions into the aforementioned ground, To enable visualization of the injection area where the calculated differential pressure is below a preset threshold, The drug solution injection management method described in the first method.
[0010] [Third method] Adopt at least one of the following A and B: The drug solution injection management method described in the first method. A) The initial pressure is the average value from the start of injection until a predetermined time has elapsed. B) The final pressure is the average value from the end of injection until a predetermined time has elapsed.
[0011] [Fourth method] When the injection areas to be supplemented are continuous, Increase the amount of supplemental injection. The drug solution injection management method described in the second method. [Effects of the Invention]
[0012] The method of the present invention provides a simple method for controlling the injection of drug solution. [Brief explanation of the drawing]
[0013] [Figure 1] This is a flowchart of this configuration. [Modes for carrying out the invention]
[0014] Next, the embodiments for carrying out the present invention will be described. Note that the present embodiment is an example of the present invention. The scope of the present invention is not limited to the scope of the present embodiment.
[0015] As shown in FIG. 1, the method of this embodiment includes a step (S3) of measuring an initial pressure at the stage of starting the injection of the chemical solution into the ground and a final pressure at the stage of completing the injection of the chemical solution into the ground, and calculating a differential pressure (P) between the initial pressure and the final pressure, and a step (S7) of substituting the calculated differential pressure (P) into the reference differential pressure in a relational expression showing the relationship between a preset reference differential pressure and a supplementary injection amount to determine the supplementary injection amount, and is a chemical solution injection management method.
[0016] In this regard, when a chemical solution is injected into the ground, usually, the density in the ground increases. Therefore, for example, a pressure gauge provided in the chemical solution injection line to the ground can measure the initial pressure at the stage of starting the injection of the chemical solution and the final pressure at the stage of completing the injection of the chemical solution, and calculate a differential pressure (P, calculated differential pressure) which is the difference between the final pressure and the initial pressure (S3). Therefore, usually, the constructor can confirm whether the injection of the chemical solution into the ground is sufficient or insufficient based on this calculated differential pressure (P). When the calculated differential pressure (P) is small, it is determined that the injection is insufficient, and a supplementary injection, which is a re-injection of the chemical solution, is performed. On the other hand, when the calculated differential pressure (P) is sufficient, it is determined that the injection is sufficient, and the supplementary injection is unnecessary (S4). In the present embodiment, the chemical solution means, for example, a chemical solution mainly composed of water glass, cement, etc. and intended for purposes such as water stop and ground strengthening.
[0017] It is preferable to determine whether supplementary injection is necessary and, if necessary, how much injection amount to use by previously (usually before injection) creating a relational expression showing the relationship between a reference differential pressure (reference differential pressure) serving as a reference and the supplementary injection amount (S6) and substituting the calculated differential pressure (P) into the reference differential pressure in the relational expression.
[0018] In determining the supplementary injection volume, the calculated differential pressure (P) can be applied to the reference differential pressure to determine the supplementary injection volume corresponding to the calculated differential pressure (a one-to-one relationship). However, the reference differential pressure may be divided into sections, and a relational expression associating each section with the supplementary injection volume may be created. In this case, the calculated differential pressure is substituted into the reference differential pressure represented by each section.
[0019] Note that the final pressure may be lower than the initial pressure. For example, this is the case when cracks in the ground are large and the chemical solution escapes from the cracks. Similarly, in this case, the supplementary injection volume can be determined by substituting the calculated differential pressure (negative value) into the relational expression.
[0020] Here, a note on the initial pressure and the final pressure will be made. The initial pressure and the final pressure may be the pressures at a single point without considering the passage of time. However, in order to improve the accuracy more, it is better to give the pressure measurement a time range as follows.
[0021] That is, first, it is preferable that the initial pressure be the average value from after a predetermined time has elapsed since the start of injection. In this regard, the predetermined time means, for example, from 10 to 200 seconds, preferably from 10 to 190 seconds, more preferably from 10 to 180 seconds, after the start of injection. If the predetermined time is too short, the credibility of the average value may be impaired.
[0022] Next, it is preferable that the final pressure be the average value from before a predetermined time has elapsed since the end of injection. In this regard, the predetermined time means, for example, from 10 to 200 seconds, preferably from 10 to 190 seconds, more preferably from 10 to 180 seconds, before the end of injection. If the predetermined time is too short, the credibility of the average value may be impaired. On the other hand, even if the predetermined time is long, there is no particular problem, but there is no need to measure especially because the pressure does not change.
[0023] Next, the method (S6) for setting the supplementary injection volume will be described. Various methods can be considered for setting the supplemental injection amount (S6), and the most suitable method can be selected on-site depending on the ground conditions and construction circumstances. Specifically, for example, methods such as setting it as a percentage of the planned injection amount, setting it as an injection rate relative to the target soil volume, or directly setting the injection amount for each injection point can be considered.
[0024] The method of setting the supplemental injection amount as a percentage of the planned injection amount involves preparing in advance tables, formulas, etc., that define the percentage of the total planned injection amount to be supplemented for each calculated differential pressure (P), and then determining the supplemental injection amount according to those tables, formulas, etc.
[0025] Setting the supplemental injection amount based on the injection ratio relative to the target soil volume is a suitable method when the target soil volume is known. This method involves determining the proportion of the total target soil volume to be supplemented using the calculated differential pressure (P), and then determining the supplemental injection amount accordingly.
[0026] The method of directly setting the supplemental injection amount for each injection point is suitable when you want to set a larger supplemental injection amount. This method involves checking the pressure gauge while supplemental injection is being carried out and stopping the supplemental injection when the pressure has risen sufficiently.
[0027] Incidentally, when repeatedly injecting chemical solutions into the ground (S2), it is preferable to visualize the injection area where the calculated differential pressure (P) does not reach a predetermined threshold by displaying it on a monitor or other display device. Visualizing this makes it easier to visually identify the injection area that does not reach the threshold.
[0028] The case where the calculated differential pressure (P) does not reach the threshold is, for example, when cracks occur in the ground and the chemical solution escapes through these cracks even after injection, preventing the pressure from increasing. The injection area refers to the range in the ground where injection can be performed by inserting a rod into one location.
[0029] In this visualization, it is preferable to understand the target ground using a 3D model and extract the number of consecutive locations (M) where supplemental injection is necessary by applying a distance filter (S5). For example, if the supplemental injection locations are filtered by distance X (meaning the distance from injection center point to injection center point of adjacent injection areas), then if the consecutive distance of supplemental injection locations is X, the number of consecutive locations (M) will be 2; if the consecutive distance is 2X, the number of consecutive locations (M) will be 3; if the consecutive distance is 3X, the number of consecutive locations (M) will be 4, and so on. The number of consecutive locations (M) of supplemental injection locations can be determined by adding 1 to the coefficient of the consecutive distance X. This method allows us to understand the consecutive distance (X) between supplemental injection locations in the up, down, left, right, and diagonal directions, as well as the number of consecutive locations (M) of supplemental injection locations. As a result, it becomes possible to create the aforementioned relational expression that takes into account the number of consecutive locations (M) of supplemental injection locations, and the amount of supplemental injection can be set according to the ground conditions.
[0030] Furthermore, if the injection areas requiring supplemental injection are consecutive, the amount of supplemental injection will usually be increased.
[0031] Furthermore, if the desired pressure initially set is reached during the supplemental injection (S8), the injection can be terminated (S9) midway through the supplemental injection (S8). Conversely, if the desired pressure is not reached even after performing the supplemental injection (S8), the amount of supplemental injection can be recalculated and the supplemental injection can be performed again (S10).
[0032] The initial injection and supplemental injection can be carried out according to the flow shown in Figure 1. First, the reference differential pressure, which is the pressure to be achieved by the chemical injection (S2), is set (S1). Next, the initial chemical injection is performed (S2). For this injection (S2), the differential pressure (P) is calculated (S3). If this calculated differential pressure (P) reaches the reference differential pressure, the injection is completed (S4).
[0033] On the other hand, if the calculated differential pressure (P) does not reach the reference differential pressure, the injection area becomes a supplemental injection point. Then, the amount of supplemental injection is determined from the calculated differential pressure (P), preferably from the calculated differential pressure (P) and the number of consecutive supplemental injection points (M) (S7).
[0034] Supplemental injection is performed (S8), and if the pressure in the ground reaches the desired pressure, the supplemental injection is completed (S9). On the other hand, if the pressure in the ground does not reach the desired pressure even after supplemental injection (S8), it is preferable to perform supplemental injection again (S10). [Examples]
[0035] Next, embodiments of the present invention will be described. In this embodiment, 24 injection zones were set in the target ground. A reference differential pressure was also set (S1). Next, 100 L of chemical solution was injected into each injection zone (S2). In this injection, the calculated differential pressure (P) reached the reference differential pressure in 15 locations, so injection was completed in these 15 locations (S3, S4). On the other hand, there were 9 injection zones where the calculated differential pressure (P) did not reach the reference differential pressure (supplementary injection zones), which will be referred to as supplementary injection zones A to I below. In the five locations of supplementary injection zones A to E, and in the three locations of supplementary injection zones F to H, the supplementary injection zones were continuous. On the other hand, in supplementary injection zone I, the supplementary injection zone was not continuous. The calculated differential pressures for each supplemental injection area were as follows: Supplemental injection area A: 0.9 MPa, Supplemental injection area B: 0.7 MPa, Supplemental injection area C: 0.8 MPa, Supplemental injection area D: 0.5 MPa, Supplemental injection area E: 0.4 MPa, Supplemental injection area F: 0.9 MPa, Supplemental injection area G: 0.7 MPa, Supplemental injection area H: 0.9 MPa, and Supplemental injection area I: 0.7 MPa. The supplemental injection volume was determined based on Table 1. The specific supplemental injection volumes were 20 L for A, 30 L for B, 20 L for C, 30 L for D, 80 L for E, 15 L for F, 25 L for G, 15 L for H, and 20 L for I (S7). Subsequently, the calculated supplemental injection volume of chemical solution was injected into each supplemental injection area (S8), and when the calculated differential pressure reached the specified pressure set at the beginning of the injection, the injection was terminated (S9).
[0036] [Table 1] [Industrial applicability]
[0037] This invention can be used as a method for managing drug solution injection. [Explanation of Symbols]
[0038] P: Calculated differential pressure, M: Number of adjacent supplemental injection zones, S1-10: Process in this configuration.
Claims
1. A step of measuring the initial pressure at the start of the injection of the chemical solution into the ground and the final pressure at the completion of the injection of the chemical solution into the ground, and calculating the differential pressure between the initial pressure and the final pressure, The process includes a step of determining the supplemental injection amount by substituting the calculated differential pressure into the reference differential pressure in a relational expression that shows the relationship between a pre-set reference differential pressure and the supplemental injection amount. A method for managing drug solution injection, characterized by the following features.
2. When repeatedly injecting chemical solutions into the aforementioned ground, To enable visualization of the injection area where the calculated differential pressure is below a preset threshold, The drug solution injection management method according to claim 1.
3. Adopt at least one of the following A and B: The drug solution injection management method according to claim 1. A) The initial pressure shall be the average value from the start of injection until a predetermined time has elapsed. B) The final pressure shall be the average value from the end of injection until a predetermined time has elapsed.
4. When the injection areas to be supplemented are continuous, Increase the amount of supplemental injection. The drug solution injection management method according to claim 2.