JP2022107219A - Evaluation method and evaluation system of construction finished shape of solidified and improved ground - Google Patents

Abstract

To provide an evaluation method and an evaluation system of a construction finished shape of a solidified and improved ground which can highly accurately and efficiently evaluate the construction finished shape of the solidified and improved ground.SOLUTION: An evaluation method of a construction finished shape of a solidified and improved ground includes: a penetration step (procedure 3) of imaging an image before coloring (video after construction P3) of the solidified and improved ground by a camera provided on a cone when the cone penetrates through the solidified and improved ground; and a pulling-up step (procedure 4) of spraying a reagent to the solidified and improved ground from a reagent spray part provided on the cone when the cone is pulled up from the solidified and improved ground, and imaging an image after coloring (video after construction P4) of the solidified and improved ground by the camera.SELECTED DRAWING: Figure 2

Description

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

There is a need for an efficient survey method that can confirm the formation of solidified improved ground in the deep mixing treatment method immediately after construction. For example, in Patent Document 1, in a high-pressure injection stirring type deep mixing process method, a cone with a camera is penetrated from the penetration position of the injection rod to the position of the improved end portion on the outer side in the radial direction, and the improved ground is based on the image captured by the camera. The evaluation method for confirming the created diameter of the above is described.

Japanese Patent No. 4886921

However, the conventional evaluation method described in Patent Document 1 and the like has room for improvement in that the evaluation of the formed form of the solidified improved ground is performed with high accuracy and efficiency.

It is an object of the present disclosure to provide an evaluation method and an evaluation system for the formed form of solidified improved ground, which can evaluate the formed formed form of solidified improved ground with high accuracy and efficiency.

The method for evaluating the formed form of the solidified improved ground according to one aspect of the embodiment of the present invention is the method for evaluating the formed formed form of the solidified improved ground in the deep mixing treatment method, in which a cone is penetrated into the solidified improved ground. Occasionally, a penetration step of capturing a pre-colored image of the solidified improved ground by a camera provided on the cone and a reagent spraying portion provided on the cone when the cone is pulled up from the solidified improved ground are used to obtain the solidified ground. Includes a pulling step of spraying on the ground and taking an image of the solidified improved ground after coloring with the camera.

Similarly, the evaluation system for the formed form of the solidified improved ground according to one aspect of the embodiment of the present invention is an evaluation system for the formed form of the solidified improved ground in the deep mixing treatment method, and includes a camera and a reagent spraying portion. The control device includes a cone control unit that controls an operation of penetrating and pulling out the cone into the improved ground, and sprays a reagent onto the solidified improved ground when the cone is pulled up. The reagent control unit that controls the reagent spraying unit and the pre-colored image of the solidification improved ground when the cone is penetrated into the improved ground are imaged, and the reagent is solidified from the reagent spraying unit when the cone is pulled up. It has an imaging control unit that controls the camera so as to capture an image after coloring of the solidified improved ground after spraying on the improved ground.

According to the present disclosure, it is possible to provide an evaluation method and an evaluation system for the formed form of the solidified improved ground, which can evaluate the formed formed form of the solidified improved ground with high accuracy and efficiency.

The figure which shows the schematic structure of the evaluation system of the formation completion form of the solidification improvement ground which concerns on embodiment. The figure which shows the procedure of the evaluation method of the formation completion form of solidification improvement ground in an embodiment. Schematic diagram for explaining the method of imaging the improved ground before and after spraying the reagent in this embodiment. Diagram showing an example of measurement data of three components before and after ground improvement The figure which shows an example of the ground image of each stage of steps 1 to 4. Schematic diagram illustrating the outline of the mechanical stirring type deep mixing process method The figure which shows an example of the post-creation image at the time of insufficient stirring in the mechanical stirring type deep-layer mixing processing method.

Hereinafter, embodiments will be described with reference to the accompanying drawings. In order to facilitate understanding of the description, the same components are designated by the same reference numerals as much as possible in each drawing, and duplicate description is omitted.

With reference to FIG. 1, the configuration of the evaluation system 1 (hereinafter, also simply referred to as “evaluation system 1”) of the formed solidified ground in the deep mixing treatment 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, the evaluation system 1 includes a cone 2 and a control device 6. The evaluation system 1 penetrates the cone 2 for data acquisition into a predetermined position of the solidified improved ground 11 in the deep mixing treatment method to acquire necessary data, and evaluates the formed form of the solidified improved ground 11 based on the acquired data. do. Here, the “finished form” refers to a portion where the target object of the construction is completed or a portion where the construction work is completed, and in the present embodiment, it refers to the solidified improved ground 11.

FIG. 1 illustrates the case of the high-pressure injection stirring method among the deep-layer mixing treatment methods. In the high-pressure injection stirring type, a rod penetration hole 12 is formed 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 horizontal and centered on the rod penetration hole 12. A solidified improved ground 11 is generated by injecting a cement slurry toward the outer side in the radial direction at an ultra-high pressure and a large flow rate, and mixing and stirring while cutting the surrounding earth and sand. Therefore, the solidified improved ground 11 is ideally formed in a substantially columnar shape centered on the rod penetration hole 12.

The distance from the axial center of the desired substantially cylindrical shape of the improved ground 11 to the outer peripheral surface is referred to as a "design improvement diameter" in the present embodiment, and the position thereof is indicated by reference numeral 13 in FIG. In the general high-pressure injection stirring method, the actually formed improved ground 11 extends from the design improved diameter to the outside in the radial direction so that the improved ground 11 satisfying the condition of the design improved diameter can be formed more reliably. It is often formed so as to protrude. That is, the created shape is formed with a diameter larger than the predetermined design improvement diameter. Therefore, in the example of FIG. 1, the position 13 of the design improvement diameter is a position closer to the axis (rod penetration hole 12) side than the outer peripheral side end portion of the improved ground 11.

In the high-pressure injection stirring type, it is determined whether or not the solidification improved ground 11 exists from the position of the rod penetration hole 12 to the position 13 where a predetermined design improvement diameter is taken outward in the radial direction, that is, the position of the outer circumference of the desired cylindrical shape. By doing so, it is possible to evaluate the formed shape of the solidified improved ground 11. For example, when the solidified improved ground 11 is generated at the position 13 of the design improved diameter, it can be evaluated that the solidified improved ground 11 is generated in the entire desired range without any problem and the finished shape is satisfactory. On the other hand, when the solidified improved ground 11 is not generated or is generated only partially at the position 13 of the design improved diameter, the solidified improved ground 11 does not spread over the entire desired range, and the finished product. Can be evaluated as having a problem.

In the evaluation system 1 of the present embodiment, when evaluating the finished shape of the high-pressure injection stirring type deep mixing treatment method, as shown in FIG. 1, only a predetermined design improvement diameter is radially outward from the rod penetration hole 12. At a distant position 13 (hereinafter, also referred to as “cone penetration position 13”), the cone 2 is penetrated into the ground 10 to acquire evaluation data.

As shown in FIG. 1, for example, the cone 2 is formed in a substantially cylindrical shape, and the tip portion is sharpened so as to easily penetrate into the ground 10. The cone 2 has a camera 3, a reagent spraying unit 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 unit 4 to the existing three-component static cone. A three-component static cone is a device used for a three-component cone penetration test (CPT) for investigating ground properties, and is a device related to ground properties at each position during penetration into the ground (penetration resistance). , Peripheral friction, pore water pressure).

The camera 3 images the solidified improved ground 11 (or the unimproved ground 10) during the penetration of the cone 2.

The reagent spraying unit 4 sprays the reagent 7 (see FIG. 3) on the solidified improved ground 11 (or the ground before improvement 10) during the penetration of the cone 2. 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, and the reagent stored in the tank through an opening opened on the peripheral surface of the cone 2 using a spraying device such as a nozzle. 7 is sprayed to the outside. The tank for storing the reagent 7 is arranged in the vicinity of the drive device 5 or the control device 4 on the ground surface, and is connected to the reagent spraying portion 4 inside the cone 2 via a tube or the like capable of supplying the reagent 7. The tank for storing the reagent 7 may be provided inside the cone 2.

The drive device 5 moves the cone 2 in the vertical direction to perform an operation of the cone 2 penetrating into the improved ground 11 or an operation of pulling out the cone 2 penetrating into the ground 11 upward. The drive device 5 is installed, for example, directly above the cone penetration position 13 on the ground surface.

In particular, in the present embodiment, the reagent spraying portion 4 is arranged behind the camera 3 (upper in FIG. 1) with respect to the penetration direction of the cone 2 (lower in FIG. 1). With this configuration, if the reagent 7 is sprayed from the reagent spraying portion 4 when the cone 2 is pulled out, the image of the improved ground 11 after being colored by the reagent 7 can be captured by the camera 3. On the other hand, when the cone 2 is first penetrated into the ground 10, if the image is taken by the camera 3 without operating the reagent spraying portion 4, the image of the improved ground 11 before being colored by the reagent 7 can be taken. Therefore, since the image before coloring can be captured at the time of penetration and the image after coloring can be captured at the time of pulling out, the cone 2 can be penetrated into the same cone penetration position 13 and pulled out, and the ground at the same position before and after coloring with the reagent can be imaged. Images can be captured. In this way, two types of images can be acquired only by one round-trip operation of penetrating and pulling out the cone 2, and evaluation can be performed efficiently.

The control device 6 controls the operations of the camera 3, the reagent spraying unit 4, and the driving device 5 provided on the cone 2. Further, the control device 6 evaluates the finished shape of the solidified improved ground 11 based on each information such as an image acquired from the camera 3. The control device 6 has a cone control unit 61, a reagent control unit 62, an imaging control unit 63, and an evaluation unit 64 with respect to these functions.

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

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

The image pickup control unit 63 controls the image pickup timing of the improved ground 11 (or the ground before improvement 10) by the camera 3. More specifically, when the cone 2 is penetrated into the improved ground 11, the imaging control unit 63 takes an image of the solidified improved ground 11 before coloring (hereinafter, also referred to as “post-creation image P3”), and the improved ground 11 When the cone 2 is pulled up from the ground, the solidified ground 11 is imaged after the reagent is sprayed from the reagent spraying portion 4 onto the improved ground 11 to discolor it (hereinafter, also referred to as “post-creation image P4”). The camera 3 is controlled so as to. Further, when the cone 2 is penetrated into the pre-improvement ground 10, the image pickup control unit 63 captures a pre-colored image of the pre-improvement ground 10 (hereinafter, also referred to as “pre-improvement image P1”) from the pre-improvement ground 10. When the cone 2 is pulled up, the camera 3 is moved so as to capture a post-colored image (hereinafter, also referred to as “pre-improvement image P2”) of the pre-improvement ground 10 after spraying the reagent from the reagent spraying portion 4 onto the improved ground 11. Control.

The evaluation unit 64 evaluates the finished shape of the improved ground 11 based on the information such as the pre-colored image (post-creation image P3) and the post-colored image (post-creation image P4) of the solidified improved ground 11 captured by the camera 3. .. Further, the evaluation unit 64 can also evaluate the finished shape of the improved ground 11 by using the pre-colored image (pre-improved image P1) or the post-colored image (pre-improved image P2) of the pre-improved ground 10. Further, the evaluation unit 64 can also evaluate the finished shape of the improved ground 11 by comparing the data of the three components (penetration resistance, peripheral friction, pore water pressure) of the improved ground 10 and the improved ground 11.

The control device 6 is physically a CPU (Central Processing Unit), a main storage device such as a RAM (Random Access Memory) and a ROM (Read Only Memory), an input device such as a keyboard and a mouse as an input device, 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 on hardware such as a CPU and RAM. , It is realized by reading and writing data in a RAM or an auxiliary storage device. That is, by executing the control program for the evaluation work of the improved ground of the evaluation system 1 according to the present embodiment on the computer, the control device 6 includes the cone control unit 61, the reagent control unit 62, and the reagent control unit 62 in FIG. It functions as an image pickup control unit 63 and an evaluation unit 64.

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

With reference to FIG. 2, a method for evaluating the formed shape of the solidified improved ground 11 in the deep mixing treatment method according to the embodiment will be described. FIG. 2 is a diagram showing a procedure of an evaluation method of a formed form of the solidified improved ground 11 in the embodiment.

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

Step 1 (pre-penetration step): Perform an intrusion test of the ground 10 before improvement. This test is performed before the construction of the deep mixing treatment method. As shown in FIG. 1, the penetration position of the cone 2 is a position corresponding to the position 13 of the design improvement diameter of the improved ground 11 when the high-pressure injection stirring method of the deep mixing treatment method is normally carried out. While the cone 2 is penetrated into the ground 10 by the drive device 5, the three component data (penetration resistance, peripheral friction, pore water pressure) of the improved ground 10 and the original ground (pre-improved ground) 10 imaged by the camera 3 The video data (video P1 before improvement) is continuously acquired. In step 1, the reagent is not sprayed by the reagent spraying unit 4. The process of step 1 is carried out by the cone control unit 61 and the imaging control unit 63 of the control device 6.

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

Step 3 (Penetration step): Perform a penetration test of the improved ground 11. This test is carried out immediately after the construction of the deep mixing treatment method (before the improvement ground 11 is hardened, for example, within about 3 hours after the completion of the construction). The penetration position of the cone 2 is preferably the position 13 having the same design improvement diameter as in step 1. While penetrating the cone 2 into the ground 10, the three component data (penetration resistance, peripheral friction, pore water pressure) of the improved ground 11 and the pre-colored improved ground 11 (stirring state of cement milk and the original ground) imaged by the camera 3 ) Video data (post-creation video P3) and the video data are continuously acquired. In step 3, the reagent is not sprayed by the reagent spraying unit 4. The process of step 3 is carried out by the cone control unit 61 and the imaging control unit 63 of the control device 6.

Step 4 (Pulling step): Subsequently, in the penetration test of the improved ground 11, the penetrated cone 2 is pulled up at a low speed. At this time, similarly to the procedure 2, the reagent is continuously sprayed from the reagent spraying portion 4 of the cone 2, and the improved ground (colored) after the reagent is sprayed, which is imaged by the camera 3 installed below the reagent spraying portion 4. Video data (video P4 after construction) of the reagent component) is continuously acquired. The process of step 4 is carried out by the cone control unit 61 of the control device 6, the reagent control unit 62, and the imaging control unit 63.

FIG. 3 is a schematic view illustrating an image pickup method of the improved ground 11 before and after spraying the reagent in the present embodiment. FIG. 3 (A) shows an image taken at the time of penetration, and FIG. 3 (B) shows an image taken at the time of pulling up. As shown in FIG. 3A, the camera 3 captures an image of each depth position of the improved ground 11 while the cone 2 moves downward at the time of penetration. At this time, the reagent spraying unit 4 is not operating and the reagent is not sprayed. FIG. 3A corresponds to the above-mentioned procedure 3, and if the imaging target is replaced from the improved ground 11 to the improved ground 10, the procedure 1 is also supported. By the method shown in FIG. 3A, the uncolored ground before spraying the reagent can be imaged.

On the other hand, as shown in FIG. 3B, the reagent 7 is sprayed from the reagent spraying portion 4 onto the surface of the improved ground 11 while the cone 2 moves upward during pulling. Since the reagent spraying portion 4 is arranged above the camera 3, the reagent 7 is sprayed on the surface of the improved ground 11 on which the camera 3 faces. FIG. 3B corresponds to the above-mentioned procedure 4, and corresponds to the procedure 2 if the imaging target is replaced from the improved ground 11 to the improved ground 10. By the method shown in FIG. 3B, the ground after coloring after spraying the reagent can be imaged.

Returning to FIG. 2, the description of procedure 5 and subsequent steps will be continued.

Step 5: A first data analysis is performed. The three-component data of the improved ground 10 acquired in step 1 (“three components [1]” in FIG. 2) and the three-component data of the improved ground 11 acquired in step 3 (“three components” in FIG. 2). Compare with [3] ”). Specifically, the intrusive resistances of the three components [1] and [3] are compared, the peripheral frictions are compared, and the pore water pressures are compared. The process of step 5 is carried out by the evaluation unit 64 of the control device 6.

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

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

In this embodiment, the judgment criteria (judgment criteria 1) based on the three components for judging that the ground improvement has been carried out without any problem up to the range of the predetermined design improvement diameter 13 is that all of the following three conditions are satisfied. be. The following three conditions (1-1), (1-2), and (1-3) show the characteristic that the improved ground 11 is in a high-concentration muddy water state.
(1-1) Regarding the penetration resistance value qc, after qc_ improvement, it is lower than before qc_ improvement, and it shows a generally uniform depth distribution tendency.
(1-2) Regarding the peripheral friction fs, there is a clear difference between sandy soil and cohesive soil. Compared with before fs_improvement, after fs_improvement, the depth distribution is similar to that after qt_improvement. thing.
(1-3) Regarding the pore water pressure u, the mud water pressure distribution is shown after u_ improvement.

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) shows the penetration resistance qc (MN / m ² ), the horizontal axis of FIG. 4 (B) shows the peripheral friction fs (kN / m ² ), and the horizontal axis of FIG. 4 (C). The axis shows the pore water pressure u (kN / m ² ). The vertical axis of each figure indicates the altitude (m), that is, the depth of the hole into which the cone 2 is inserted. Further, in each figure, the graph before the ground improvement is shown by a dotted line, and the graph after the ground improvement is shown by a thick solid line.

In the example of FIG. 4, from FIG. 4 (A), with respect to the penetration resistance value qc, after qc_ improvement (thick solid line) is lower than before qc_ improvement (dotted line), and a substantially uniform depth distribution tendency is shown. You can see that. Further, from FIG. 4B, the peripheral friction fs is compared with that before fs_improvement (dotted line), where there is a clear difference between sandy soil and cohesive soil, and after fs_improvement (thick solid line), (A). It can be seen that the depth distribution is similar to that after qt_ improvement of). Further, from FIG. 4C, it can be seen that the pore water pressure u shows the mud water pressure distribution after u_ improvement (thick solid line), that is, it shows a substantially linear depth distribution tendency. Therefore, in the example of FIG. 4, it can be evaluated that the judgment criteria (judgment criteria 1) based on the above three components are satisfied.

Further, in step 7, the judgment criteria (judgment criteria 2) based on the ground images P1 to P4 for judging that the ground improvement is performed within the range of the predetermined design improvement diameter 13 without any problem are as follows (2-). All three conditions 1), (2-2), and (2-3) are satisfied.
(2-1) By comparing the post-creation image P3 and the post-creation image P4, the improved ground 11 has a coloring reaction by the reagent 7.
(2-2) By comparing the pre-improvement video P1 with the post-creation video P3 or P4, it is in a muddy state after construction (after ground improvement).
(2-3) By comparing the pre-improvement image P1 and the pre-improvement image P2, the pre-improvement ground 10 does not have a coloring reaction due to the reagent 7, and the ground is not alkaline.

FIG. 5 is a diagram showing an example of the ground image of each stage of steps 1 to 4. FIG. 5A is an example of the video P1 before improvement. Since the image P1 before improvement shows the original ground 10 before ground improvement, that is, the ground where cement milk is not mixed, the color becomes dark as a whole, such as brown, as shown in FIG. 5 (A). .. Further, the black portion in the image is a void existing in the ground 10. If the ground 10 before improvement is not alkaline, the image P2 before improvement also has the same image as in FIG. 5 (A).

FIG. 5B is an example of the post-creation video P3. The post-creation image P3 shows the improved ground 11, that is, the ground before improvement 10 in which cement milk is agitated. Therefore, as shown in FIG. 5 (B), a bright color such as gray or grayish white as a whole is shown. It becomes. Further, because the ground is agitated, the number of voids is reduced as compared with the ground before improvement 10 in FIG. 5 (A).

FIG. 5C is an example of the post-creation video P4. In the post-creation image P4, the portion A discolored by applying the reagent 7 to the improved ground 11 is shown. Therefore, as shown in FIG. 5 (C), the discoloration such as red as compared with FIG. The image includes the portion A.

In the example of FIG. 5, by comparing the post-creation image P3 of FIG. 5 (B) with the post-creation image P4 of FIG. Has a coloring reaction with a reagent, and it is shown that the condition (2-1) is satisfied. 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 images P3 and P4 after the formation in this way, it becomes possible to more clearly identify the cement milk portion of the improved ground 11 by paying attention to the presence or absence of the coloring reaction, and the evaluation of the finished shape of the improved ground 11 can be made. Can be done with high accuracy.

Further, in the example of FIG. 5, the post-creation image P3 is compared with the pre-improvement image P1 of FIG. 5 (A) and the post-creation image P3 of FIG. 5 (B) or the post-creation image P4 of FIG. 5 (C). , The grayish white color of the improved ground 11 of P4 and the red color of the discolored area A are not present in the original ground 10 before the improvement, and it can be determined that the ground was generated by the agitation of the ground improvement. It is shown that there is. By comparing the pre-improvement image P1 with the post-creation images P3 and P4 in this way, it is possible to identify the relative change with the pre-improvement ground 10, and the extraction of the modified portion by the improved ground 11 is accurate. I can do it well. As a result, the evaluation of the finished shape of the improved ground 11 based on the ground image can be made more accurate.

Further, by comparing the pre-improvement video P1 and the pre-improvement video P2 in FIG. 5 (A), if there is no significant difference between the pre-improvement video P1 and the pre-improvement video P2, the pre-improvement ground 10 is subjected to a reagent. There is no coloring reaction, indicating that the ground is not alkaline. By comparing the pre-improvement video P1 and the pre-improvement video P2 in this way, it is possible to determine whether or not the geology of the pre-improvement ground 10 is alkaline, and the extraction accuracy of the modified portion 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, in the example of FIG. 5, it can be evaluated that the judgment criteria (judgment criteria 2) based on the ground image are satisfied.

Returning to FIG. 2, in step 7, it can be determined that the finished product is satisfied when both of the above criteria 1 and 2 are satisfied. The process of step 7 is carried out by the evaluation unit 64 of the control device 6.

The image comparison in step 6 and the judgment criterion 2 in step 7 may be configured to carry out only a part. At least in step 6, the post-creation image P3 and the post-creation image P4 may be compared, and it may be confirmed in step 7 that the condition (2-1) is satisfied. Alternatively, the pre-improvement video P1 is further compared with the post-creation video P3 or P4 in step 6, and the condition (2-2) is also confirmed in step 7, that is, the evaluation by the pre-improvement video P2. May be omitted.

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

FIG. 6 is a schematic view illustrating an outline of a mechanical stirring type deep mixing treatment method. In FIG. 6, the work area is shown in a plan view. As shown in FIG. 6, the mechanical stirring type is a construction method in which the in-situ soil and the improving material are mixed and stirred by the rotation of the stirring blade 14 to create a columnar improved ground 11 in the ground. Note that FIG. 6 illustrates a biaxial type using two stirring blades 14.

Also in the mechanical stirring type deep mixing treatment method shown in FIG. 6, the cone 2 is penetrated into the work area (the part indicated by reference numeral 11 in the figure) before and after the ground improvement to acquire necessary data, and based on the acquired data. It is possible to evaluate the formed shape of the solidified improved ground 11.

In the mechanical stirring type deep mixing treatment method shown in FIG. 6, since stirring is performed by the stirring blade 14 which is a physical element, unlike the high pressure injection stirring method, the outer edge position of the improved ground 11 is surely reached. Stirring is done. Therefore, in the mechanical stirring type, the penetration position of the cone 2 for evaluating the formed shape of the solidification improved ground 11 is different from the position 13 of the design improvement diameter in the case of the high pressure injection stirring type. For example, as shown in FIG. 6, whether or not the solidified improved ground 11 exists at the intermediate position 13A (improved intermediate portion) of the design improved diameter between the center of rotation of the stirring blade 14 and the outer edge of the improved ground 11. By making a determination, the overall quality of the solidified improved ground 11 can be evaluated, and thereby the formed shape of the solidified improved ground 11 can be evaluated.

Further, in the mechanical stirring type deep mixing treatment method, the properties of the improved ground 11 after soil stirring may be different from those of the high pressure injection stirring method. Therefore, the point of view for comparison between the post-creation image P3 and the post-creation 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-creation image P4 does not contain cement milk and discoloration due to the reagent 7 is also possible. Does not occur. That is, it is considered that the post-creation video P4 has almost no difference from the post-creation video 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 that it is considered that the discolored region A is included in the post-construction image P4 at the cone penetration position 13A even if the stirring is insufficient. That is, even if there is insufficient stirring in the mechanical stirring type, it is conceivable that a difference may occur between the post-creation image P4 and the post-creation image P3, unlike the high-pressure injection stirring type. Therefore, in the mechanical stirring type, it is preferable that the comparison method between the post-creation image P3 and the post-creation image P4 is different from that of the high-pressure injection stirring type.

FIG. 7 is a diagram showing an example of the post-creation image P4 when the stirring is insufficient in the mechanical stirring type deep mixing treatment method. In the case of the mechanical stirring type, if there is insufficient stirring, clay lump B is generated in the soil, and it is considered that the clay lump B portion does not show a coloring reaction in the post-creation image P4. Further, since the stirring itself is performed as described above, the portion where the stirring is performed well is discolored by applying the reagent 7, and the discolored region A is also included in the post-creation image P4. On the other hand, if the stirring is performed properly, it is considered that the portion of the clay lump B having no coloring reaction is reduced.

Therefore, in the mechanical stirring type, for example, the finished shape can be evaluated based on the occupancy rate of the discolored region A in the post-creation image P4 shown in FIG. For example, when the occupancy rate of the discolored region A of the created image P4 is equal to or greater than a predetermined value, it can be determined that the entire solidified improved ground 11 is well agitated. It can be configured to be evaluated as satisfying the based judgment criteria (judgment criteria 2).

The method for evaluating the formed shape of the solidified improved ground 11 according to the present embodiment is an image before coloring of the solidified improved ground 11 by a camera 3 provided on the cone 2 when the cone 2 is penetrated into the solidified improved ground 11 (post-creation image). In the penetration step (procedure 3) for imaging P3), the reagent 7 is sprayed on the solidification improved ground 11 from the reagent spraying portion 4 provided on the cone 2 when the cone 2 is pulled up from the solidification improvement ground 11, and the solidification is improved by the camera 3. It includes a pulling step (procedure 4) of capturing a post-colored image of the ground 11 (post-creation image P4).

With this configuration, the pre-colored image can be captured when the cone 2 is penetrated, and the post-colored image can be captured 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 taken. In this way, two types of images can be acquired only by one round-trip operation of penetrating and pulling out the cone 2, and evaluation can be performed efficiently. Further, as described above, by comparing the images of the ground before and after coloring of the solidified improved ground 11, that is, the post-creation image P3 and the post-creation image P4, the cement milk of the improved ground 11 is focused on the presence or absence of a coloring reaction. It becomes possible to identify the part of the ground 11 more clearly, and it is possible to accurately evaluate the finished shape of the improved ground 11. Therefore, the method for evaluating the formed form of the solidified improved ground 11 according to the present embodiment can evaluate the formed formed form of the solidified improved 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. Those skilled in the art with appropriate design changes to these specific examples 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 of the above-mentioned specific examples, its arrangement, conditions, shape, and the like are not limited to those illustrated, and can be changed as appropriate. The combination of each element included in each of the above-mentioned specific examples can be appropriately changed as long as there is no technical contradiction.

1 Evaluation system 2 Cone 3 Camera 4 Reagent spraying unit 5 Driver 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 Previous image (image before coloring of ground before improvement)
P2 Image before improvement (Image after coloring the ground before improvement)
Image after P3 construction (image before coloring of solidified improved ground)
Image after P4 construction (image after coloring of solidified improved ground)
Step 1 Pre-penetration process Step 2 Pre-pulling process Step 3 Penetration process Step 4 Pulling process Step 7 Evaluation process

Claims (10)

It is a method of evaluating the formed form of solidified improved ground in the deep mixing treatment method.
A penetration step of capturing a pre-colored image of the solidified improved ground with a camera provided on the cone when the cone is penetrated into the solidified improved ground.
When the cone is pulled up from the solidified improved ground, a reagent is sprayed on the solidified improved ground from a reagent spraying portion provided on the cone, and the camera captures a colored image of the solidified improved ground.
Evaluation method including. A pre-penetration process in which the cone is penetrated into the ground before improvement and the three components related to the ground properties are measured.
A pre-pulling step of pulling the cone that has penetrated into the ground in the pre-penetrating step from the improved pre-ground, and a pre-pulling step.
Including
In the intrusive step, the three components are measured.
The evaluation method according to claim 1. In the pre-penetration step, the camera captures a pre-colored image of the improved ground.
The evaluation method according to claim 2. In the pre-pulling step, the reagent is sprayed by the reagent spraying portion, and the image after coloring of the improved ground is imaged by the camera.
The evaluation method according to claim 2 or 3. An evaluation step of comparing the pre-colored image and the post-colored image of the solidified improved ground to evaluate the finished shape is further included.
The evaluation method according to any one of claims 1 to 4. In the evaluation step, the pre-colored image of the pre-improved ground is compared with the pre-colored image or the post-colored image of the solidified improved ground to evaluate the finished shape.
The evaluation method according to claim 5. In the evaluation step, the finished shape is evaluated by comparing the pre-colored image and the post-colored image of the ground before improvement.
The evaluation method according to claim 5 or 6. The deep-layer mixing treatment method is a high-pressure injection stirring type.
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 any one of claims 1 to 7. The deep mixing treatment method is a mechanical stirring method.
The penetration position of the cone is the improved intermediate part,
The evaluation method according to any one of claims 1 to 7. It is an evaluation system for the formation of solidified and improved ground in the deep mixing treatment method.
A cone with a camera and a reagent sprayer,
Equipped with a control device,
The control device is
A cone control unit that controls the operation of penetrating the cone into the solidified ground and pulling it out.
A reagent control unit that controls the reagent spraying unit so that the reagent is sprayed on the solidified improved ground when the cone is pulled up from the solidified improved ground.
After the pre-colored image of the solidified improved ground is captured when the cone is penetrated into the solidified improved ground, and the reagent is sprayed from the reagent spraying portion onto the solidified improved ground when the cone is pulled up from the solidified improved ground. An imaging control unit that controls the camera so as to capture an image after coloring of the solidified improved ground.
Have,
Rating system.

Images