JP7127163B2 - Evaluation method and evaluation system for completed form of solidified improved ground - Google Patents

Description

TECHNICAL FIELD The present disclosure relates to an evaluation method and an evaluation system for the completed form of solidified improved ground.

There is a need for an efficient survey method that allows confirmation of the finished form of solidified improved ground in the deep layer mixing method immediately after preparation. For example, in Patent Document 1, in a high-pressure injection agitation type deep mixing treatment method, a cone with a camera is penetrated at the position of the improved end radially outward from the penetration position of the injection rod, and the improved ground is based on the captured image of the camera. An evaluation method for confirming the diameter of the land created is described.

Japanese Patent No. 4886921

However, the conventional evaluation method described in Patent Literature 1 and the like has room for improvement in terms of highly accurate and efficient evaluation of the finished form of solidified improved ground.

An object of the present disclosure is to provide a method and an evaluation system for evaluating the finished form of solidified improved ground that can evaluate the finished form of improved solidified ground with high accuracy and efficiency.

A method for evaluating the finished form of solidified improved ground according to one aspect of the embodiment of the present invention is a method for evaluating the finished form of improved solidified ground in the deep mixing method, wherein when a cone is penetrated into the ground before improvement A pre-penetration step of capturing a pre-coloring image of the pre-improvement ground with a camera provided in the cone;
When the cone penetrated into the ground in the pre-penetration step is lifted from the pre-improvement ground, a reagent spraying unit provided on the cone scatters a reagent, and the camera captures a colored image of the pre-improvement ground. a pre-pulling step, a penetration step of capturing a pre-coloring image of the solidified improved ground with the camera when the cone is penetrated into the solidified improved ground, and a before when pulling up the cone from the solidified improved ground a lifting step of spraying a reagent from the reagent spraying unit onto the solidified and improved ground and taking an image of the solidified and improved ground after coloring with the camera; the before-coloring image and the after-coloring image of the ground before improvement; and an evaluation step of comparing the pre-coloring image and the post-coloring image of the solidified improved ground to evaluate the finished shape , wherein the evaluation step includes: (1) the pre-colored image of the solidified improved ground; (2) the pre-coloring image of the pre-improved ground and the pre-coloring image or the post-coloring image of the solidified and improved ground by comparison with the post-coloring image; (3) By comparing the pre-improvement ground with the pre-coloring image and the post-coloring image, the pre-improvement ground has a coloring reaction by the reagent. It is judged that the ground improvement is being carried out without any problem when all the three conditions of the judgment criteria based on the ground image, that is, that the ground is not alkaline and that the ground is not alkaline, are satisfied .

Similarly, a system for evaluating the completed shape of solidified improved ground according to one aspect of the embodiment of the present invention is a system for evaluating the completed shape of solidified improved ground in the deep mixing method, comprising a camera and a reagent spraying unit. and a control device, wherein the control device includes a cone control unit that controls the operation of penetrating and pulling out the cone from the pre-improvement ground and the solidified improved ground, and the pre-improved ground and the solidified improvement a reagent control unit that controls the reagent spraying unit to spray a reagent on the pre-improved ground and the solidified improved ground when the cone is pulled up from the pre- improved ground; and the improvement when the cone penetrates the pre-improved ground. A pre-coloring image of the pre-improvement ground is captured, and when the cone is pulled up from the pre-improvement ground, the reagent is sprayed on the pre-improvement ground from the reagent spraying unit, and then a post-coloring image of the pre-improvement ground is captured, When the cone penetrates into the solidified and improved ground, a pre-coloring image of the solidified and improved ground is captured, and when the cone is lifted from the solidified and improved ground, the reagent is sprayed from the reagent spraying unit to the solidified and improved ground. An imaging control unit that controls the camera to capture a post-coloring image of the solidification improved ground, the pre-coloring image and the post-coloring image of the pre-improvement ground, and the pre-coloring image and and an evaluation unit that compares the images after coloring and evaluates the finished shape , wherein the evaluation unit (1) compares the image before coloring and the image after coloring of the solidified improved ground, and evaluates the solidified (2) by comparing the pre-coloring image of the pre-improvement ground with the pre-coloring image or the post-coloring image of the solidified and improved ground, it is possible to determine the state of muddy water after ground improvement; and (3) a comparison of the pre-coloring image and the post-coloring image of the pre-improvement ground shows that the pre-improvement ground has no coloring reaction due to the reagent and is not an alkaline ground. It is judged that ground improvement is being carried out without problems when all three conditions of the judgment criteria based on are satisfied .

Advantageous Effects of Invention According to the present disclosure, it is possible to provide a method and an evaluation system for evaluating the finished form of improved solidified ground that can evaluate the finished form of improved solidified ground with high accuracy and efficiency.

FIG. 1 is a diagram showing a schematic configuration of an evaluation system for a completed form of solidified improved ground according to an embodiment. The figure which shows the procedure of the evaluation method of the completed form of solidification improvement ground in embodiment. Schematic diagram for explaining the imaging method of the improved ground before and after the reagent spraying in the present embodiment Diagram showing an example of measurement data of three components before and after ground improvement Figure showing an example of the ground image at each stage of steps 1 to 4 Schematic diagram explaining the outline of the mechanical agitation type deep mixing treatment method A diagram showing an example of a post-development image when agitation is insufficient in the mechanical agitation deep mixing method.

Embodiments will be described below with reference to the accompanying drawings. In order to facilitate understanding of the description, the same constituent elements in each drawing are denoted by the same reference numerals as much as possible, and overlapping descriptions are omitted.

With reference to FIG. 1, the configuration of an evaluation system 1 (hereinafter also simply referred to as "evaluation system 1") for the completed formation of solidified improved ground in the deep mixing method according to the embodiment will be described. FIG. 1 is a diagram showing a schematic configuration of an evaluation system 1 for a completed form of solidified improved ground 11 according to an embodiment.

As shown in FIG. 1, evaluation system 1 comprises cone 2 and controller 6 . The evaluation system 1 acquires necessary data by penetrating the cone 2 for data acquisition into a predetermined position of the solidified improved ground 11 in the deep mixing method, and evaluates the completed form of the solidified improved ground 11 based on the acquired data. do. Here, the "finished form" refers to a completed portion of a construction target or a completed portion of construction work, and in this embodiment, refers to the solidified improved ground 11 .

FIG. 1 exemplifies the case of the high-pressure injection agitation type among the deep mixing treatment methods. In the high-pressure injection agitation type, a rod penetration hole 12 is opened in the center of the range to be improved in the ground 10, and the injection rod (not shown) penetrated into the rod penetration hole 12 is horizontally and centered on the rod penetration hole 12. Cement slurry is jetted radially outward at an ultrahigh pressure and a large flow rate, and mixed and stirred while cutting the surrounding earth and sand to generate the solidified improved ground 11 . Therefore, the solidified improved ground 11 is ideally formed in a substantially columnar shape with the rod penetration hole 12 as the axis.

In this embodiment, the distance from the axis of the desired substantially cylindrical shape of the improved ground 11 to the outer peripheral surface is called the "design improved diameter", and the position is indicated by reference numeral 13 in FIG. In addition, in the general high-pressure injection stirring type construction method, the improved ground 11 that is actually formed extends radially outward from the design improvement diameter so that the improved ground 11 that satisfies the design improvement diameter can be formed more reliably. It is often formed to protrude. In other words, the created shape is formed with a diameter larger than the predetermined designed improved diameter. For this reason, in the example of FIG. 1, the design improvement diameter position 13 is positioned closer to the axis (rod penetration hole 12 ) than the outer peripheral end of the improved ground 11 .

In the high-pressure injection agitation method, it is determined whether or not the solidified improved ground 11 exists up to the position 13 where a predetermined design improvement diameter is taken radially outward from the position of the rod penetration hole 12, that is, the position of the outer circumference of the desired cylindrical shape. By doing so, the finished form of the solidified improved ground 11 can be evaluated. For example, when the solidified improved ground 11 is generated at the position 13 of the design improvement diameter, the improved solidified ground 11 is generated without any problem in the entire desired range, and the finished shape is satisfactory. On the other hand, if the solidified improved ground 11 is not generated at the position 13 of the design improvement diameter, or if it is generated only in part, the solidified improved ground 11 is not spread over the entire desired range, and the finished shape can be evaluated as having problems.

In the evaluation system 1 of the present embodiment, when evaluating the finished form of the high-pressure jet stirring type deep mixing treatment method, as shown in FIG. At a remote position 13 (hereinafter also referred to as "cone penetration position 13"), the cone 2 is penetrated into the ground 10 to acquire data for evaluation.

The cone 2 is formed, for example, in a substantially columnar shape as shown in FIG. The cone 2 has a camera 3 , a reagent spraying section 4 and a driving device 5 . The cone 2 can be realized, for example, by adding the functions of the camera 3 and the reagent spraying section 4 to the existing three-component static cone. A three-component static cone is a device used for a three-component cone penetration test (Cone Penetration Test: CPT) for investigating ground properties, and three components related to ground properties (penetration resistance , surface friction, and pore water pressure).

The camera 3 images the consolidated improved ground 11 (or the pre-improved ground 10) during the penetration of the cone 2.

The reagent spraying unit 4 sprays a reagent 7 (see FIG. 3) onto the solidified improved ground 11 (or the pre-improved ground 10) while the cone 2 is penetrating. The reagent 7 has a function of discoloring an alkaline substance, and is, for example, an aqueous solution of phenolphthalein. The reagent spraying unit 4 has, for example, a tank for storing the reagent 7 outside the cone 2. Using a spraying device such as a nozzle, the reagent stored in the tank is sprayed through an opening formed on the peripheral surface of the cone 2. 7 is scattered outside. A tank storing the reagent 7 is arranged, for example, near the driving device 5 or the control device 4 on the ground surface, and is connected to the reagent spraying section 4 inside the cone 2 via a tube capable of supplying the reagent 7 or the like. A configuration in which a tank for storing the reagent 7 is provided inside the cone 2 may be employed.

The driving device 5 vertically moves the cone 2 to penetrate the improved ground 11 or pulls up the cone 2 that has penetrated the ground 11 . The drive device 5 is installed, for example, directly above the cone penetration location 13 on the ground surface.

Note that, particularly in this embodiment, the reagent spraying unit 4 is arranged behind the camera 3 (upward in FIG. 1) with respect to the penetrating direction of the cone 2 (downward in FIG. 1). With this configuration, if the reagent 7 is sprayed from the reagent spraying section 4 when the cone 2 is pulled out, the image of the improved ground 11 colored with the reagent 7 can be captured by the camera 3 . On the other hand, when the cone 2 penetrates the ground 10 first, if the camera 3 takes an image without operating the reagent spraying unit 4, an image of the improved ground 11 before being colored with the reagent 7 can be captured. Therefore, an image before coloring can be captured during penetration, and an image after coloring can be captured during extraction. Therefore, by simply penetrating the cone 2 into the same cone penetration position 13 and pulling it out, the ground at the same position before and after coloring with the reagent can be captured. Images can be captured. In this way, two types of images can be acquired by only one reciprocating motion of inserting and pulling out the cone 2, and evaluation can be performed efficiently.

A control device 6 controls operations of the camera 3 , the reagent spraying section 4 and the driving device 5 provided on the cone 2 . In addition, the control device 6 evaluates the finished shape of the solidified improved ground 11 based on various information such as images acquired from the camera 3 . The control device 6 has a cone control section 61, a reagent control section 62, an imaging control section 63, and an evaluation section 64 for these functions.

The cone control unit 61 controls the driving device 5 to control the operation of penetrating and pulling out the cone 2 from the improved ground 11 .

The reagent control unit 62 controls the timing of spraying the reagent to the improved ground 11 (or the pre-improved ground 10) by the reagent spraying unit 4. FIG. More specifically, the reagent control unit 62 controls the reagent spraying unit 4 so that when the cone 2 is pulled up, the reagent is sprayed on the improved ground 11 (or the pre-improved ground 10) to discolor the portion containing cement milk.

The imaging control unit 63 controls the imaging timing of the improved ground 11 (or the pre-improved ground 10 ) by the camera 3 . More specifically, when the cone 2 penetrates the improved ground 11, the imaging control unit 63 captures a pre-colored image of the solidified improved ground 11 (hereinafter also referred to as a “post-development image P3”), and captures the improved ground 11. When the cone 2 is pulled up from the pit, a post-coloring image of the solidified improved ground 11 after discoloration by dispersing the reagent from the reagent spraying unit 4 onto the improved ground 11 (hereinafter also referred to as "post-development image P4") is captured. to control camera 3. In addition, when the cone 2 penetrates the ground 10 before improvement, the imaging control unit 63 captures a pre-coloring image of the ground 10 before improvement (hereinafter also referred to as “pre-improvement image P1”), and from the ground 10 before improvement When the cone 2 is pulled up, the camera 3 is set so as to capture a post-coloring image (hereinafter also referred to as "pre-improvement image P2") of the pre-improvement ground 10 after the reagent has been sprayed on the improved ground 11 from the reagent spraying unit 4. Control.

The evaluation unit 64 evaluates the finished shape of the improved ground 11 based on the information such as the image before coloring (image after creation P3) and the image after coloring (image after creation P4) of the solidified improved ground 11 captured by the camera 3. . The evaluation unit 64 can also use the pre-coloring image (pre-improvement image P1) or the post-coloring image (pre-improvement image P2) of the pre-improvement ground 10 to evaluate the finished shape of the improved ground 11. Furthermore, the evaluation unit 64 can compare the three component data (penetration resistance, circumferential friction, pore water pressure) of the pre-improved ground 10 and the improved ground 11 to evaluate the finished shape of the improved ground 11.

The control device 6 physically includes a CPU (Central Processing Unit), RAM (Random Access Memory) and ROM (Read Only Memory) as main storage devices, input devices such as a keyboard and a mouse as input devices, a display, and the like. It can be configured as a computer system including an output device, a communication module which is a data transmission/reception device such as a network card, an auxiliary storage device, and the like.

Each function of the control device 6 shown in FIG. 1 operates a communication module, an input device, and an output device under the control of the CPU by loading predetermined computer software onto hardware such as the CPU and RAM. , by reading and writing data in a RAM or an auxiliary storage device. That is, by executing a control program for evaluation work of improved ground of the evaluation system 1 according to the present embodiment on a computer, the control device 6 includes the cone control unit 61 in FIG. 1, the reagent control unit 62, It functions as an imaging control unit 63 and an evaluation unit 64 .

Note that the control device 6 may be configured to perform only part of the functions shown in FIG. For example, the function of the evaluation unit 64 may not be provided in the control device 6 itself, and an external device may evaluate the finished form based on the captured image.

With reference to FIG. 2, a description will be given of a method for evaluating the completed shape of the solidified improved ground 11 in the deep mixing method according to the embodiment. FIG. 2 is a diagram showing the procedure of the method for evaluating the finished form of the solidified improved ground 11 in the embodiment.

As shown in FIG. 2, the evaluation method of this embodiment is performed in seven steps. The contents of steps 1 to 7 will be described below.

Procedure 1 (pre-penetration step): Conduct a penetration test on the ground 10 before improvement. This test is conducted before the deep mixing method. The penetration position of the cone 2 is a position corresponding to the design improvement diameter position 13 of the improved ground 11 when the high-pressure injection stirring method of the deep mixing method is normally performed as shown in FIG. While penetrating the cone 2 into the ground 10 by the driving device 5, the three component data (penetration resistance, circumferential friction, pore water pressure) of the ground 10 before improvement and the original ground (pre-improvement ground) 10 imaged by the camera 3 Video data (pre-improved video P1) is continuously acquired. In procedure 1, the reagent spraying unit 4 does not spray the reagent. The processing of Procedure 1 is performed by the cone control section 61 and the imaging control section 63 of the control device 6 .

Procedure 2 (preliminary pulling process): Subsequently, in the penetration test of the pre-improvement ground 10, the penetrated cone 2 is pulled up at a low speed. At this time, the reagent is continuously sprayed from the reagent spraying part 4 of the cone 2, and image data of the original ground (pre-improved ground) 10 after the reagent spraying is imaged by the camera 3 installed below the reagent spraying part 4. (Pre-improvement image P2) is continuously acquired. The processing of procedure 2 is performed by the cone control unit 61 , the reagent control unit 62 and the imaging control unit 63 of the control device 6 .

Procedure 3 (penetration step): A penetration test of the improved ground 11 is carried out. This test is performed immediately after execution of the deep layer mixing method (before hardening of the improved ground 11, for example, within approximately 3 hours after completion of preparation). The penetrating position of the cone 2 is preferably the position 13 of the same design improvement diameter as the procedure 1. While penetrating the cone 2 into the ground 10, the three component data of the improved ground 11 (penetration resistance, circumferential friction, pore water pressure) and the improved ground 11 before coloring captured by the camera 3 (stirring state of cement milk and original ground ) (post-creation image P3) are continuously acquired. In step 3, the reagent spraying unit 4 does not spray the reagent. The processing of Procedure 3 is performed by the cone control section 61 and the imaging control section 63 of the control device 6 .

Procedure 4 (pulling up process): Subsequently, in the penetration test of the improved ground 11, the penetrated cone 2 is pulled up at a low speed. At this time, as in procedure 2, the reagent is continuously sprayed from the reagent spraying part 4 of the cone 2, and the improved ground (colored The image data (post-creation image P4) of the cement component) is continuously acquired. The processing of procedure 4 is performed by the cone control unit 61 , the reagent control unit 62 and the imaging control unit 63 of the control device 6 .

3A and 3B are schematic diagrams illustrating a method of imaging the improved ground 11 before and after the reagent is sprayed according to this embodiment. FIG. 3(A) shows an image captured during penetration, and FIG. 3(B) shows an image captured during withdrawal. As shown in FIG. 3A, during penetration, the camera 3 captures images of the improved ground 11 at each depth position while the cone 2 moves downward. At this time, the reagent spraying unit 4 is not operating and the reagent is not sprayed. FIG. 3A corresponds to the procedure 3 described above, and also corresponds to the procedure 1 if the imaging target is changed from the improved ground 11 to the pre-improved ground 10 . By the method shown in FIG. 3A, it is possible to image the uncolored ground before spraying the reagent.

On the other hand, as shown in FIG. 3(B), the reagent 7 is sprayed onto the surface of the improved ground 11 from the reagent spraying section 4 while the cone 2 is moving upward during pulling up. Since the reagent spraying unit 4 is arranged above the camera 3 , the reagent 7 is spread all over the surface of the improved ground 11 facing the camera 3 . FIG. 3B corresponds to the procedure 4 described above, and also corresponds to the procedure 2 if the imaging target is changed from the improved ground 11 to the pre-improved ground 10 . By the method shown in FIG. 3(B), it is possible to image the colored ground after spraying the reagent.

Returning to FIG. 2, the description from step 5 onwards will be continued.

Step 5: A first data analysis is performed. The three component data of the ground 10 before improvement acquired in procedure 1 (“three components [1]” in FIG. 2) and the three component data of the improved ground 11 acquired in procedure 3 (“three components [3]”). Specifically, the penetration resistances of the three components [1] and [3] are compared, the circumferential frictions are compared, and the pore water pressures are compared. The processing of procedure 5 is performed by the evaluation unit 64 of the control device 6 .

Step 6: A second data analysis is performed. A total of four images P1 to P4 acquired in Procedure 1, Procedure 2, Procedure 3, and Procedure 4 are compared. Specifically, the post-creation image P3 and the post-creation image P4 are compared, the pre-improvement image P1 is compared with the post-creation image P3 or P4, and the pre-improvement image P1 and the pre-improvement image P2 are compared. The processing of procedure 6 is performed by the evaluation unit 64 of the control device 6 .

Procedure 7 (evaluation step): Based on the result of the first data analysis of procedure 5 and the result of the second data analysis of procedure 6, the finished shape of the improved ground 11 is evaluated.

Judgment criteria (criterion 1) based on three components for determining that the ground improvement is performed without problems up to the range of the predetermined design improvement diameter 13, in this embodiment, by satisfying all the following three conditions be. The following three conditions (1-1), (1-2), and (1-3) show characteristics that the improved ground 11 is highly concentrated muddy water.
(1-1) The penetration resistance value qc after qc_improvement is lower than that before qc_improvement, and shows a substantially uniform depth distribution tendency.
(1-2) Regarding circumferential friction fs, compared with before fs_improvement, where there is a clear difference between sandy soil and cohesive soil, after fs_improvement shows a similar depth distribution to that after qt_improvement. thing.
(1-3) Regarding the pore water pressure u, u_after improvement shows the mud water pressure distribution.

FIG. 4 is a diagram showing an example of measurement data of three components before and after ground improvement. The horizontal axis of FIG. 4(A) indicates penetration resistance qc (MN/m ² ), the horizontal axis of FIG. 4(B) indicates circumferential friction fs (kN/m ² ), and the horizontal axis of FIG. The axis indicates the pore water pressure u (kN/m ² ). The vertical axis of each figure indicates the altitude (m), ie, the depth of the hole into which the cone 2 is inserted. Also, in each figure, the graph before ground improvement is indicated by a dotted line, and the graph after ground improvement is indicated by a thick solid line.

In the example of FIG. 4, from FIG. 4A, the penetration resistance value qc after qc_ improvement (thick solid line) is lower than qc_ before improvement (dotted line), and shows a generally uniform depth distribution tendency. It can be seen that In addition, from FIG. 4(B), regarding the circumferential friction fs, compared with fs_before improvement (dotted line), where there is a clear difference between sandy soil and cohesive soil, after fs_improvement (thick solid line), (A ) shows a similar depth distribution to that after qt_improvement. Further, from FIG. 4(C), it can be seen that the pore water pressure u after u_improvement (thick solid line) shows a muddy water pressure distribution, that is, shows a substantially linear depth distribution tendency. Therefore, in the example of FIG. 4, it can be evaluated that the criterion (criterion 1) based on the above three components is satisfied.

Further, in procedure 7, the judgment criteria (judgment criteria 2) based on the ground images P1 to P4 for judging that the ground improvement is performed without problems up to the range of the predetermined design improvement diameter 13 are as follows (2- All three conditions 1), (2-2), and (2-3) must be satisfied.
(2-1) A comparison between the post-development image P3 and the post-development image P4 shows that the improved ground 11 has a coloring reaction due to the reagent 7 .
(2-2) A comparison of the pre-improvement image P1 and the post-development image P3 or P4 shows that the ground is in a muddy state after land development (after ground improvement).
(2-3) By comparing the pre-improvement image P1 and the pre-improvement image P2, the pre-improvement ground 10 has no coloring reaction due to the reagent 7 and is not an alkaline ground.

FIG. 5 is a diagram showing an example of a ground image at each stage of procedures 1-4. FIG. 5A is an example of the pre-improvement video P1. Since the pre-improvement image P1 shows the original ground 10 before ground improvement, that is, the ground to which cement milk is not mixed, as shown in FIG. . Also, black portions in the image are voids present in the ground 10 . Note that when the pre-improvement ground 10 is not alkaline, the pre-improvement image P2 also becomes the same image as in FIG. 5(A).

FIG. 5B is an example of the post-creation image P3. Since the post-construction image P3 shows the improved ground 11, that is, the pre-improved ground 10 mixed with cement milk, the image P3 has a bright color such as gray or grayish white as a whole, as shown in FIG. 5(B). becomes. Also, due to the agitation of the ground, the number of voids is reduced compared to the pre-improved ground 10 of FIG. 5(A).

FIG. 5C is an example of the post-creation image P4. Since the post-construction image P4 shows the portion A that has been discolored due to the application of the reagent 7 to the improved ground 11, as shown in FIG. An image including part A is obtained.

In the example of FIG. 5, by comparing the post-development image P3 of FIG. 5B and the post-development image P4 of FIG. shows that there is a coloring reaction with the reagent, satisfying the condition (2-1). If it can be confirmed that there is a coloring reaction, it can be determined that the improved ground 11 is mixed with cement milk at the imaging position. By comparing the post-development images P3 and P4 in this way, it is possible to more clearly identify the cement milk portion of the improved ground 11 by focusing on the presence or absence of a coloring reaction, and to evaluate the completed shape of the improved ground 11. can be performed with high accuracy.

Further, in the example of FIG. 5, by comparing the pre-improvement image P1 in FIG. 5(A) with the post-creation image P3 in FIG. , The grayish white of the improved ground 11 of P4 and the red color of the discolored area A are not in the original pre-improvement ground 10, and can be determined to have occurred due to the agitation of the ground improvement. It is shown that there is By comparing the pre-improvement image P1 and the post-development images P3 and P4 in this way, it is possible to identify relative changes with the pre-improvement ground 10, and extract the improved portion by the improved ground 11 with accuracy. I can do it well. As a result, it is possible to more accurately evaluate the finished shape of the improved ground 11 based on the ground image.

Furthermore, by comparing the pre-improvement image P1 and the pre-improvement image P2 in FIG. There is no coloring reaction, indicating that it is not an alkaline soil. By comparing the pre-improvement image P1 and the pre-improvement image P2 in this way, it is possible to determine whether the ground 10 before improvement is alkaline or not, and the extraction accuracy of the portion modified by the improved ground 11 can be further improved. As a result, the accuracy of evaluation of the finished shape of the improved ground 11 based on the ground image can be further improved.

From the above, it can be evaluated that the example of FIG. 5 satisfies the criterion (criterion 2) based on the ground image.

Returning to FIG. 2, in step 7, it can be determined that the finished form is satisfied when both the criteria 1 and 2 are satisfied. The processing of procedure 7 is performed by the evaluation unit 64 of the control device 6 .

It should be noted that the image comparison in procedure 6 and the determination criterion 2 in procedure 7 may be implemented only partially. At least in step 6, the post-creation image P3 and post-creation image P4 are compared, and in step 7 it is confirmed that the condition (2-1) is satisfied. Alternatively, in step 6, the pre-improvement image P1 is further compared with the post-creation image P3 or P4, and in step 7, it is confirmed that the condition (2-2) is satisfied, that is, the evaluation by the pre-improvement image P2. may be omitted.

In the above embodiment, the case of the high-pressure injection stirring deep mixing method was described as an example, but the evaluation system 1 and the evaluation method of the present embodiment can also be applied to a mechanical stirring deep mixing method.

FIG. 6 is a schematic diagram for explaining the outline of the mechanical stirring type deep mixing treatment method. FIG. 6 shows the work area in plan view. As shown in FIG. 6, in the mechanical agitation method, the in-situ soil and the improvement material are mixed and agitated by the rotation of the agitating blade 14 to create a cylindrical improved ground 11 in the ground. In addition, in FIG. 6, a biaxial type using two stirring blades 14 is illustrated.

In the mechanical agitation type deep mixing treatment method shown in FIG. It is possible to evaluate the completed form of the solidified improved ground 11 .

In the mechanical stirring deep mixing method shown in FIG. 6, stirring is performed by the stirring blade 14, which is a physical element. Agitation is performed. For this reason, in the mechanical agitation type, the penetration position of the cone 2 for evaluating the finished form of the solidified improved ground 11 is different from the position 13 of the design improvement diameter in the case of the high pressure injection agitation type. For example, as shown in FIG. 6, it is determined whether or not the solidified improved ground 11 exists at an intermediate position 13A (improved intermediate portion) of the design improved diameter between the rotation center of the stirring blade 14 and the outer edge of the improved ground 11. By judging, the overall quality of the improved solidified ground 11 can be evaluated, and thus the completed form of the improved solidified ground 11 can be evaluated.

Further, in the deep mixing treatment method of the mechanical stirring type, the property of the improved ground 11 after soil stirring may differ from that of the high-pressure injection stirring method. For this reason, the focus of comparison between the created image P3 and the created image P4 under the above condition (2-1) by the evaluation unit 64 may be changed.

In the case of the high-pressure injection stirring type, if there is insufficient stirring, the stirring itself is not performed at the position 13 of the design improvement diameter of the improved ground 11, so the post-development image P4 does not contain cement milk, and there is no discoloration due to the reagent 7. does not occur. That is, it is considered that the after-creation image P4 is almost the same as the after-creation image P3.

On the other hand, in the case of the mechanical stirring type, stirring is performed at least within the range of the stirring blade 14, so even if there is insufficient stirring, it is considered that the discolored area A is included in the post-creation image P4 at the cone penetration position 13A. That is, even if there is insufficient agitation in the mechanical agitation method, unlike the high-pressure injection agitation method, a difference may occur between the post-creation image P4 and the post-creation image P3. For this reason, in the mechanical agitation method, it is preferable to use a different method for comparing the post-creation image P3 and the post-creation image P4 than in the high-pressure jet agitation method.

FIG. 7 is a diagram showing an example of a post-development image P4 when stirring is insufficient in the mechanical stirring deep layer mixing method. In the case of the mechanical agitation type, if the agitation is insufficient, clay lumps B are generated in the soil, and it is considered that the clay lumps B do not exhibit a coloring reaction in the post-development image P4. Further, since the stirring itself is performed as described above, the well-stirred portion is discolored by the application of the reagent 7, and the discolored area A is also included in the post-creation image P4. On the other hand, when the stirring is properly performed, it is considered that the portion of the clay lumps B, which does not undergo coloring reaction, shrinks.

Therefore, in the mechanical stirring method, for example, it is possible to adopt a configuration in which the finished shape is evaluated based on the occupancy rate of the discolored area A in the post-creation image P4 shown in FIG. For example, when the occupancy rate of the discolored area A in the post-construction image P4 is equal to or greater than a predetermined value, it can be determined that the entire solidified improved ground 11 is well stirred. It is possible to adopt a configuration in which it is evaluated that the criteria (criteria 2) are satisfied.

The method for evaluating the completed form of the improved solidified ground 11 according to the present embodiment is a pre-colored image (post-developed image) of the improved solidified ground 11 captured by the camera 3 provided on the cone 2 when the cone 2 is penetrated into the improved ground 11. P3) is imaged in a penetrating step (procedure 3), and when the cone 2 is pulled up from the solidified and improved ground 11, the reagent 7 is sprayed on the solidified and improved ground 11 from the reagent spraying unit 4 provided in the cone 2, and the solidification is improved by the camera 3. and a lifting step (procedure 4) of capturing the post-coloring image (post-development image P4) of the ground 11 .

With this configuration, an image before coloring can be taken when the cone 2 penetrates, and an image after coloring can be taken when the penetrated cone 2 is pulled out. Images of the ground at the same position before and after coloring with the reagent 7 can be captured. In this way, two types of images can be acquired by only one reciprocating motion of inserting and pulling out the cone 2, and evaluation can be performed efficiently. In addition, as described above, by comparing the images of the ground before and after coloring of the solidified improved ground 11, that is, the after-creation image P3 and the after-creation image P4, the cement milk of the improved ground 11 is focused on the presence or absence of the coloring reaction. can be identified more clearly, and the finished shape of the improved ground 11 can be evaluated with high accuracy. Therefore, the method for evaluating the finished form of the solidified improved ground 11 according to the present embodiment can evaluate the finished form of the improved solidified ground 11 with high accuracy and efficiency.

The present embodiment has been described above with reference to specific examples. However, the present disclosure is not limited to these specific examples. Design modifications to these specific examples by those skilled in the art are also included in the scope of the present disclosure as long as they have the features of the present disclosure. Each element included in each specific example described above and its arrangement, conditions, shape, etc. are not limited to those illustrated and can be changed as appropriate. As long as there is no technical contradiction, the combination of the elements included in the specific examples described above can be changed as appropriate.

1 evaluation system 2 cone 3 camera 4 reagent spraying unit 5 driving device 6 control device 61 cone control unit 62 reagent control unit 63 imaging control unit 64 evaluation unit 7 reagent 10 pre-improvement ground 11 solidification improved ground 13, 13A cone penetration position P1 improvement Before image (image before coloring of the ground before improvement)
P2 Image before improvement (image after coloring the ground before improvement)
P3 Post-development image (image of solidified and improved ground before coloring)
P4 Post-development image (improved solidification ground image after coloring)
Procedure 1 Pre-penetration process Procedure 2 Pre-lifting process Procedure 3 Penetration process Procedure 4 Pulling process Procedure 7 Evaluation process

Claims (5)

A method for evaluating the completed form of solidified improved ground in the deep mixing method,
A pre-penetration step of capturing a pre-colored image of the pre-improvement ground with a camera provided on the cone when the cone is penetrated into the pre-improvement ground;
When the cone penetrated into the ground in the pre-penetration step is lifted from the pre-improvement ground, a reagent spraying unit provided on the cone scatters a reagent, and the camera captures a colored image of the pre-improvement ground. a pre-lifting step to
A penetration step of capturing a pre-colored image of the solidified and improved ground with the camera when the cone is penetrated into the solidified and improved ground;
A pulling-up step of scattering a reagent from the reagent spraying unit onto the solidified and improved ground when pulling up the cone from the solidified and improved ground, and capturing a colored image of the solidified and improved ground with the camera;
an evaluation step of comparing the pre-coloring image and the post-coloring image of the ground before improvement, and the pre-coloring image and the post-coloring image of the solidified improved ground to evaluate the finished shape;
including
In the evaluation step,
(1) By comparing the pre-coloring image and the post-coloring image of the solidified and improved ground, it is found that the solidified and improved ground has a coloring reaction due to the reagent;
(2) By comparing the pre-coloring image of the pre-improvement ground with the pre-coloring image or the post-coloring image of the solidified improved ground, it is in a muddy state after ground improvement, and
(3) By comparing the pre-coloring image of the pre-improvement ground with the post-coloring image, the pre-improvement ground has no coloring reaction due to the reagent and is not an alkaline ground.
Judging that the ground improvement is being carried out without problems when all three conditions of the judgment criteria based on the ground image are satisfied,
Evaluation method. In the pre-penetration step, three components related to ground properties are measured ,
In the penetration step, measuring the three components,
The three components include penetration resistance, skin friction, and pore water pressure,
In the evaluation step, in addition to the judgment criteria based on the ground image,
(1) Regarding the penetration resistance, the measured value of the solidified improved ground is lower than the measured value of the ground before improvement, and shows a generally uniform depth distribution tendency.
(2) Regarding the circumferential friction, compared with the measured value of the ground before improvement, which has a clear difference between sandy soil and cohesive soil, the measured value of the solidified improved ground is the same as the penetration resistance of the solidified improved ground. showing a similar depth distribution, and
(3) Regarding the pore water pressure, the measured value of the solidified improved ground indicates a mud water pressure distribution;
Judging that the ground improvement is being performed without problems when all three conditions of the criteria based on the three components of are satisfied,
The evaluation method according to claim 1. The deep mixing treatment method is a high-pressure jet stirring method,
The created shape is formed with a diameter larger than a predetermined design improvement diameter,
The penetration position of the cone is the position of the design improvement diameter,
The evaluation method according to claim 1 or 2 . The deep mixing treatment method is a mechanical stirring type,
The penetration position of the cone is the modified middle part,
The evaluation method according to claim 1 or 2 . An evaluation system for the completed form of solidified improved ground in the deep mixing method,
a cone having a camera and a reagent applicator;
a controller;
The control device is
a cone control unit that controls the operation of penetrating and pulling out the cone from the pre-improvement ground and the solidified improved ground;
a reagent control unit that controls the reagent spraying unit to spray a reagent onto the pre-improved ground and the solidified improved ground when the cone is pulled up from the pre-improved ground and the solidified improved ground;
A pre-coloring image of the pre-improvement ground is captured when the cone is penetrated into the pre-improvement ground, and the reagent is sprayed on the pre-improvement ground from the reagent spraying unit when the cone is pulled up from the pre-improvement ground. Later, the image after coloring of the ground before improvement is taken, the image before coloring of the solidified improved ground is taken when the cone is penetrated into the solidified improved ground, and the reagent is taken when the cone is pulled up from the solidified improved ground. an imaging control unit that controls the camera to capture a colored image of the solidified and improved ground after the reagent is sprayed from the spraying unit onto the solidified and improved ground;
an evaluation unit that compares the pre-coloring image and the post-coloring image of the pre-improvement ground and the pre-coloring image and the post-coloring image of the solidified improved ground to evaluate the finished form;
has
The evaluation unit
(1) By comparing the pre-coloring image and the post-coloring image of the solidified and improved ground, it is found that the solidified and improved ground has a coloring reaction due to the reagent;
(2) By comparing the pre-coloring image of the pre-improvement ground with the pre-coloring image or the post-coloring image of the solidified improved ground, it is in a muddy state after ground improvement, and
(3) By comparing the pre-coloring image of the pre-improvement ground with the post-coloring image, the pre-improvement ground has no coloring reaction due to the reagent and is not an alkaline ground.
Judging that the ground improvement is being carried out without problems when all three conditions of the judgment criteria based on the ground image are satisfied ,
rating system.

Images