Ground strength estimation device, ground strength estimation system, and ground strength estimation method

Abstract

To provide a ground strength estimation device that can estimate ground strength after construction is completed for the entire construction area.SOLUTION: A ground strength estimation device 100 includes a data preparation processing unit 112 that generates second matrix data by performing normalization processing on first matrix data generated based on construction data. The ground strength estimation device 100 also includes a singular value decomposition processing unit 113 that performs singular value decomposition on the second matrix data to calculate first configuration coefficients. The ground strength estimation device 100 also includes an influence calculation unit 114 that calculates distance influence degree determined by a horizontal distance between a ground strength estimation point and each installed pile. The ground strength estimation device 100 also includes a configuration coefficient estimation unit 115 that calculates a relationship between the first configuration coefficient and the distance influence degree and calculates a second configuration coefficient for the distance influence degree, and a ground strength estimation unit 116 that estimates ground strength on the basis of a third matrix data calculated based on the second configuration coefficient.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to a ground strength estimation device, a ground strength estimation system, and a ground strength estimation method. [Background technology]

[0002] Conventionally, a technique has been proposed for estimating whether a target ground strength has been achieved by a construction method in which pillars are constructed underground to compact the surrounding ground. Patent Document 1 discloses a compaction management device that estimates ground strength using an eccentric motor. The compaction management device disclosed in Patent Document 1 estimates ground strength based on the current value of the eccentric motor, which increases in accordance with the ground strength. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2019-157385 Summary of the Invention [Problem to be solved by the invention]

[0004] The compaction management device disclosed in Patent Document 1 can estimate the ground strength at the construction site at the time of construction, but cannot estimate the ground strength over the entire construction area after construction is completed, which is set as the target strength.

[0005] The present invention has been made in consideration of the problems inherent in the prior art, and an object of the present invention is to provide a ground strength estimation device that can estimate the ground strength after construction is completed for the entire construction area. [Means for solving the problem]

[0006] A ground strength estimation device according to an embodiment of the present invention is a ground strength estimation device that estimates the strength of ground constructed by a compaction pile construction device that compacts the ground by constructing pillar-shaped objects underground, and includes: an observation value information acquisition unit that acquires construction data used by the compaction pile construction device; a data preparation processing unit that generates first matrix data based on the construction data and generates second matrix data by performing normalization processing on the first matrix data; a singular value decomposition processing unit that performs singular value decomposition on the second matrix data to calculate a first constituent coefficient expressed as the product of a left singular vector, a singular value, and a right singular vector; an influence calculation unit that calculates a distance influence degree determined by the horizontal distance between the ground strength estimation point where the ground strength is estimated and each constructed pile; a constituent coefficient estimation unit that calculates the relationship between the first constituent coefficient and the distance influence degree by regression analysis and calculates a second constituent coefficient for the distance influence degree based on the calculated relationship; and a ground strength estimation unit that converts the second constituent coefficient into a matrix to calculate third matrix data and estimate the ground strength based on the third matrix data.

[0007] A ground strength estimation system according to another aspect of the present invention is an apparatus for compacting the ground by constructing pillar-shaped objects underground, and includes a compaction pile construction apparatus having a casing pipe, a lifting device for raising and lowering the casing pipe, and a rotary drive device for rotating the casing pipe, and a ground strength estimation device for estimating the strength of the ground constructed by the compaction pile construction apparatus, wherein the ground strength estimation device includes an observation value information acquisition unit that acquires construction data used in the compaction pile construction apparatus, and generates first matrix data based on the construction data and generates second matrix data by normalizing the first matrix data. the second matrix data to calculate a first constituent coefficient expressed as the product of a left singular vector, a singular value, and a right singular vector; an influence calculation unit that calculates a ground strength estimation point at which ground strength is estimated and a distance influence determined by the horizontal distance to each installed pile; a constituent coefficient estimation unit that calculates the relationship between the first constituent coefficient and the distance influence by regression analysis and calculates a second constituent coefficient for the distance influence based on the calculated relationship; and a ground strength estimation unit that converts the second constituent coefficient into a matrix to calculate third matrix data and estimates ground strength based on the third matrix data.

[0008] Another aspect of the present invention is a ground strength estimation method that is executed by a computer and estimates the strength of ground constructed using a method of compacting the ground by constructing pillar-shaped objects underground. The method performs singular value decomposition based on construction data at the time of casing pipe penetration, calculates a distance influence degree determined by the horizontal distance between the ground strength estimation point where the ground strength is estimated and each constructed pile, performs regression analysis based on the relationship between the results of the singular value decomposition and the distance influence degree, and estimates the depthwise ground strength at any point in the construction area based on the results of the regression analysis. [Effects of the Invention]

[0009] According to the present invention, it is possible to provide a ground strength estimation device that can estimate the ground strength after completion of construction for the entire construction area. [Brief explanation of the drawings]

[0010] [Figure 1] 1 is a diagram showing the configuration of a ground strength estimation system according to an embodiment of the present invention; [Figure 2] FIG. 10 is a diagram for explaining a compaction method by driving sand piles using the ground strength estimation system according to this embodiment. [Figure 3] 1 is a block diagram showing the configuration of a ground strength apparatus according to an embodiment of the present invention; [Figure 4] 1 is a block diagram showing a functional configuration of a ground strength apparatus according to an embodiment of the present invention; [Figure 5] 1 is a diagram for explaining construction data to be analyzed by the ground strength estimation system according to the present embodiment. FIG. [Figure 6] 3 is a diagram for explaining a data frame applied in the ground strength estimation system according to the present embodiment. FIG. [Figure 7] 3 is a diagram for explaining a data frame applied in the ground strength estimation system according to the present embodiment. FIG. [Figure 8]FIG. 2 is a diagram for explaining data applied in the ground strength estimation system according to the present embodiment. [Figure 9] FIG. 2 is a diagram for explaining singular value decomposition applied in the ground strength estimation system according to the present embodiment. [Figure 10] FIG. 2 is a diagram for explaining dimension reduction applied in the ground strength estimation system according to the present embodiment. [Figure 11] FIG. 2 is a diagram for explaining an example of singular value decomposition applied in the ground strength estimation system according to the present embodiment. [Figure 12] 10 is a diagram for explaining influence degree calculation in the ground strength estimation system according to the present embodiment. FIG. [Figure 13A] 10 is a diagram for explaining the relationship between the configuration coefficient and the influence degree in the ground strength estimation system according to the present embodiment. FIG. [Figure 13B] 10 is a diagram for explaining the relationship between the configuration coefficient and the influence degree in the ground strength estimation system according to the present embodiment. FIG. [Figure 13C] 10 is a diagram for explaining the relationship between the configuration coefficient and the influence degree in the ground strength estimation system according to the present embodiment. FIG. [Figure 14] FIG. 10 is a diagram for explaining the estimation of a configuration coefficient in the ground strength estimation system according to the present embodiment. [Figure 15] FIG. 2 is a diagram for explaining ground strength estimation in the ground strength estimation system according to the present embodiment. [Figure 16A] 10A and 10B are diagrams for explaining the results of ground strength estimation in the ground strength estimation system according to the present embodiment. [Figure 16B] 10A and 10B are diagrams for explaining the results of ground strength estimation in the ground strength estimation system according to the present embodiment. [Figure 16C] 10A and 10B are diagrams for explaining the results of ground strength estimation in the ground strength estimation system according to the present embodiment. [Figure 16D] 10A and 10B are diagrams for explaining the results of ground strength estimation in the ground strength estimation system according to the present embodiment. [Figure 17] 4 is a flowchart showing an example of processing performed by the ground strength estimation device according to the present embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0011] The ground strength estimation device 100 and the ground strength estimation system 10 according to this embodiment will be described in detail below with reference to the drawings. Note that the dimensional proportions in the drawings are exaggerated for the sake of explanation and may differ from the actual proportions.

[0012] (Configuration of ground strength estimation system 10) 1 is a diagram for explaining a construction method to which the ground strength estimation system 10 according to this embodiment is applied. The construction method to which the ground strength estimation system 10 according to this embodiment is applied is a construction method in which the ground is compacted by constructing pillar-shaped objects in the ground using a compaction pile construction device 20.

[0013] The method of compacting the ground by constructing pillars underground corresponds to, for example, a sand compaction method or a static compaction method, in which granular material discharged into the ground through a casing is driven back to expand the particles and compact the surrounding ground. The method may also be a press-in static compaction method or a compaction grouting method, in which a mixture of granular material with a fluidizing agent and cement is injected into the ground.

[0014] The compaction pile construction device 20 according to this embodiment includes a hopper 30, a lifting device 31, a rotation drive device 32, and a casing pipe 33. The hopper 30 is provided at the upper end of the casing pipe 33 and is a portion for introducing granular material into the casing pipe 33. In this embodiment, the granular material is, for example, sand.

[0015] The lifting device 31 has a lifting motor and a power transmission means for transmitting the rotational force of the lifting motor to the casing pipe 33, and raises and lowers the casing pipe 33 into the ground. The lifting device 31 is also provided with a hydraulic sensor (not shown) for detecting the hydraulic pressure during the lifting and lowering operation of the casing pipe 33. The lifting device 31 is also provided with a depth gauge (not shown) for detecting the depth of the lower end of the casing pipe 33.

[0016] The rotation drive device 32 is equipped with a rotation motor and is a mechanism for rotating the casing pipe 33 in any direction. The rotation drive device 32 is also provided with a current sensor (not shown) that detects the current value of the rotation motor.

[0017] The compaction pile construction device 20 penetrates a casing pipe 33 into the ground to a predetermined depth using a lifting device 31 and a rotary drive device 32. The compaction pile construction device 20 also discharges granular material from the lower end of the casing pipe 33, and compacts the discharged granular material by repeating the process of pulling out and re-penetrating the casing pipe 33. The compaction pile construction device 20 may also be equipped with a device (speedometer) that measures the penetration speed when the casing pipe 33 is penetrated into the ground.

[0018] In the example shown in Figure 1, a casing pipe 33 attached to the compaction pile construction device 20 is driven into the ground to a predetermined depth by a rotary drive device 32, and then finely waving is performed to expand the diameter of the pipe and simultaneously increase the N-value between the piles. In this specification, the N-value is a numerical value that serves as a reference for determining the compaction and strength of the soil.

[0019] Figure 2 is a diagram illustrating the construction method. In step A in Figure 2, the casing pipe 33 is placed in a predetermined position, and a certain amount of sand is poured in through the hopper 30. In step B, the casing pipe 33 is rotated by the rotary drive device 32 while being penetrated into the ground. In step C, it is penetrated to a predetermined depth. In step D, the casing pipe 33 is raised to a specified height while the sand inside the casing pipe 33 is discharged. In step E, the casing pipe 33 is driven back, and the discharged sand and the surrounding ground are compacted. In step F, construction is carried out by wave construction, in which steps D and E are repeatedly performed in small increments to expand the diameter.

[0020] The ground strength estimation device 100 provided in the ground strength estimation system 10 according to this embodiment is a device that acquires construction data and estimates the strength of the compacted ground in the above-mentioned ground compaction method. Next, the details of this ground strength estimation device 100 will be described.

[0021] (Configuration of the ground strength estimation device 100) Fig. 3 is a block diagram showing the configuration of the ground strength estimation device 100 according to this embodiment. As shown in Fig. 3, the ground strength estimation device 100 may be configured as a system including a general-purpose microcomputer including a control unit 110 (CPU), a storage unit 120 (memory), an input / output IF 130 (Interface), and a communication IF 140. In this case, a computer program for causing the microcomputer to function as the ground strength estimation device 100 may be installed in the microcomputer. By executing the computer program, the microcomputer functions as a plurality of information processing circuits included in the ground strength estimation device 100.

[0022] The ground strength estimation device 100 is provided at a predetermined location that is capable of communicating with the compaction pile construction device 20. For example, the ground strength estimation device 100 may be provided in a personal computer in an office or the like that manages the ground strength estimation system 10. The ground strength estimation device 100 may also be provided inside the compaction pile construction device 20.

[0023] In this embodiment, an example is shown in which software is used to realize the multiple information processing functions of the ground strength estimation device 100. The ground strength estimation device 100 functions as multiple information processing circuits provided in the ground strength estimation device 100 by executing a computer program.

[0024] Alternatively, the ground strength estimation device 100 may be configured such that dedicated hardware for executing each information processing function is provided, and the information processing function is configured using a system LSI (Large Scale Integration) or the like. Alternatively, the ground strength estimation device 100 may configure a system in which multiple information processing functions are implemented using individual hardware.

[0025] The control unit 110 operates based on a program (not shown) stored in the storage unit 120, and executes each function of the ground strength estimation device 100. Note that the program is not limited to being stored in the storage unit 120, and may be stored in, for example, a ROM (not shown) within the ground strength estimation device 100.

[0026] As shown in FIG. 4, the storage unit 120 stores information stored in an observed value information DB 121, a calculated information DB 122, and an estimated information DB 123 in the storage unit 120 as data.

[0027] Furthermore, as described above, the storage unit 120 may store programs for each function executed by the control unit 110. The information and programs stored in the storage unit 120 may be configured as physically or logically separated areas within a single storage device. Alternatively, the storage units 120 for each data may be configured to be provided in multiple physically different storage devices.

[0028] The input / output IF 130 is an interface for transmitting and receiving data between the ground strength estimation device 100 and the outside. The input / output IF 130 may also be an interface for transmitting and receiving information to and from a user (construction manager). The input / output IF 130 includes, for example, an input IF and an output IF (not shown).

[0029] For example, the input / output IF 130 is connected to a depth gauge that detects the depth of the tip of the casing pipe 33 and a sand level gauge that detects the height of the sand surface inside the casing pipe 33, and sends construction data acquired by the depth gauge and sand level gauge to the control unit 110. The input / output IF 130 is also connected to a current sensor, a hydraulic sensor, and a speed meter, and acquires the current value I, hydraulic value p, and penetration speed v during construction, and sends the acquired data to the control unit 110.

[0030] The input IF in the input / output IF 130 has an interface function for inputting various information by a user (construction manager), and information may be input from outside the ground strength estimation device 100. Information is input to the input IF by a user via, for example, a keyboard, a mouse, a touch panel, a trackball, or a voice recognition device connected to the ground strength estimation device 100. The input IF can also input information as a data input terminal for inputting data from an external storage device (not shown) or the like.

[0031] Furthermore, the output IF in the input / output IF 130 can display the observed value information, calculated information, estimated information, etc., which will be described later, on a display device (not shown), such as a monitor, connected to the ground strength estimation device 100. The display device is, for example, a display device, a projector device, etc.

[0032] The communication IF 140 is, for example, an interface that enables mutual communication between the ground strength estimation device 100 and an external device.

[0033] (Functional configuration of the ground strength estimation device 100) Fig. 4 is a block diagram showing the functional configuration of the ground strength estimation device 100 according to this embodiment. As shown in Fig. 4, the control unit 110 of the ground strength estimation device 100 includes, as functions, an observation value information acquisition unit 111, a data preparation processing unit 112, a singular value decomposition processing unit 113, an influence degree calculation unit 114, a composition coefficient estimation unit 115, and a ground strength estimation unit 116.

[0034] The observation value information acquisition unit 111 acquires construction data used in a construction method of compacting the ground by constructing pillar-shaped structures underground. In this embodiment, the construction data corresponds to data indicating the penetration resistance value when the casing pipe penetrates. For example, the construction data is the current value I of the rotary drive device 32, the hydraulic pressure value p of the lifting device 31, and the penetration speed of the casing pipe 33. The construction data may also include information on the depth of the lower end of the casing pipe 33 measured by a depth gauge. The construction data may also include position information of the construction location on a horizontal plane. The observation value information acquisition unit 111 stores the acquired construction data in the observation value information DB 121.

[0035] The data preparation processing unit 112 generates first matrix data based on the construction data, and generates second matrix data by normalizing the first matrix data. Specifically, the data preparation processing unit 112 generates first matrix data that summarizes each construction data for the construction order in which the construction was performed. In addition, the data preparation processing unit 112 stores the generated first matrix data in the calculation information DB 122.

[0036] FIG. 5 is a diagram for explaining the construction sequence. The circles in area A1 indicate existing piles, which are not included in the analysis target. The ground strength estimation device 100 according to this embodiment uses the construction data of pile numbers 1 to 15 in area A2 to generate data for confirming the estimation accuracy of the position of pile number E. The pile numbers 1 to 15 indicate the driving sequence (construction sequence).

[0037] In this embodiment, the first matrix data is generated by setting the depth and depth interval to be estimated, and then multiplying the observed values ​​of a single pile by a moving average according to the set depth and depth interval, as shown in FIG. 6. For example, in the example shown in FIG. 6, a predetermined number of current values ​​I, hydraulic pressure values ​​p, penetration speeds v, and N values ​​are stored as construction data in m rows in the depth direction. For example, the predetermined number corresponds to the number of observed depths. Furthermore, the data preparation processing unit 112 generates first matrix data by arranging the observed values ​​of a single pile, multiplied by the moving average, vertically in the matrix shown in FIG. 6, and arranging the data for each pile horizontally.

[0038] Furthermore, the data preparation processing unit 112 normalizes the generated first matrix data to generate second matrix data. Since the data stored in the first matrix data are construction data with different units, normalization is performed to adjust the values.

[0039] The normalization process is performed based on the following equation (1): In addition, the data preparation processing unit 112 stores the generated second matrix data in the calculation information DB 122. Here, X ′p indicates the vector that stores the normalized data of the pth row. p indicates a vector that stores the data in the p-th row of the matrix X. Also, μ p is X p The sample mean of σ is also shown. p is X p Denotes the square root of the sample variance of .

number

[0040] The data preparation processing unit 112 performs the normalization of the above formula (1) on all rows (see FIG. 7). In this specification, the matrix in which the data preparation processing unit 112 has performed the normalization processing on all rows is referred to as the observation matrix Z obs FIG. 8 shows the observation matrix Z obs . It should be noted that the observation matrix Z obs corresponds to the second matrix data. Also, the observation matrix Z obsIn the above equation, I represents the current value, p represents the hydraulic pressure, v represents the penetration speed, and N represents the N value. Note that v may represent the time interval during which the casing pipe 33 is penetrated, instead of the penetration speed.

[0041] The singular value decomposition processing unit 113 performs singular value decomposition on the second matrix data to calculate first constituent coefficients expressed as products of left singular vectors, singular values, which are matrices in which the singular values ​​are arranged in diagonal terms, and right singular vectors. Specifically, the singular value decomposition processing unit 113 performs singular value decomposition on the second matrix data to calculate left singular vectors U, singular values ​​Σ, and right singular vectors V as shown in the following equation (2): T Figure 9 shows the second matrix data, the observation matrix Z obs Let U be the left singular vector, Σ be the singular value, and V be the right singular vector. T The singular value decomposition state is shown in.

number

[0042] Furthermore, the singular value decomposition processing unit 113 reduces the dimension of the singular value decomposed data. obs Shows.

[0043] Furthermore, the singular value decomposition processing unit 113 generates the dimension-reduced observation matrix Z obs In contrast, U r φ r Let,Σ r V T r A r By replacing it with obs is replaced by the following equation (3) to calculate the first configuration coefficient: r corresponds to the vertical basis function, which is a learning-type basis function that reflects the vertical characteristics of the observed values. r corresponds to the first composition coefficient, which is a composition coefficient matrix that indicates the degree of influence between observation points. Figure 11 shows the observation matrix Z obs Shows.

number

[0044] The influence calculation unit 114 calculates the distance influence determined by the horizontal distance between the ground strength estimation point where the ground strength is estimated and each installed pile. For example, assume that the ground around the installed pile hardens and affects the configuration coefficient. If the distance influence of a pile driven at a certain point i on an arbitrary point j in a planar space is Dij, the distance influence D at point j is expressed as the sum of Dij as shown in Equation (4). Dij is calculated for the number of installed piles. FIG. 12 shows an example of the distance influence on a horizontal plane. The horizontal distance is calculated using the position information of each pile stored in the observation value information DB 121. The position information of each pile may be information acquired by the observation value information acquisition unit 111 and stored in the observation value information DB 121, as described above. The position information of each pile (construction location) may be information previously stored in the observation value information DB 121 by the user (administrator) via the input / output IF 130 based on the construction plan.

number

[0045] The composition coefficient estimation unit 115 calculates the relationship between the first composition coefficient and the distance influence degree by regression analysis, and calculates the second composition coefficient for the distance influence degree based on the calculated relationship.

[0046] Specifically, the construction coefficient estimation unit 115 estimates the second construction coefficient of an arbitrary point in a planar space by performing a simple regression analysis of the distance influence D and the first construction coefficient. Figures 13A to 13C are graphs showing the relationship between the first construction coefficients α1 to α3 and the distance influence D. The numbers in Figures 13A to 13C correspond to information relating to the driving order of the piles (columnar objects).

[0047] 13A, the relationship between the first configuration coefficient α1 and the distance influence degree D is expressed by the following regression equation (5), where the regression coefficients are α=−246.4, β=252.5, and γ=3.30.

number

[0048] 13B and 13C, the relationship between the first configuration coefficients α2 and α3 and the distance influence degree D is shown by the following regression equation (6). Here, in the example of FIG. 13B, the regression coefficients are α=-0.98 and β=13.2. In the example of FIG. 13C, the regression coefficients are α=0.63 and β=-8.69. [Number 6] y=αx+β (6)

[0049] The composition coefficient estimation unit 115 estimates the second composition coefficient of an arbitrary point in a planar space based on the above formulas (5) and (6). FIG. 14 is a diagram showing the influence I at an arbitrary point. While the above-mentioned distance influence D is an index representing the relationship between pouring points, the influence I is an index representing the relationship between a pouring point and an arbitrary point in a planar space. Like the distance influence D, the influence I is also calculated by the above formula (4). Furthermore, the second composition coefficient can be calculated by substituting the calculated influence I for x in formula (5) or formula (6). That is, the composition coefficient estimation unit 115 may calculate the relationship between the first composition coefficient and the distance influence by regression analysis, and calculate the second composition coefficient for the influence based on the calculated relationship.

[0050] The ground strength estimation unit 116 calculates third matrix data by forming a matrix of the second configuration coefficients, and estimates the ground strength based on the third matrix data. Specifically, the ground strength estimation unit 116 calculates third matrix data in which the second configuration coefficients estimated by the configuration coefficient estimation unit 115 are arranged.

[0051] The ground strength estimation unit 116 first stores the second configuration coefficients in one matrix. After that, the ground strength estimation unit 116 arranges the second configuration coefficients estimated at point i in order from 1st to rth. For example, if there are two or more estimation points, the second configuration coefficients arranged vertically are arranged horizontally for each estimation point. In this specification, the third matrix data stored in this way is referred to as A * It is written as:

[0052] Furthermore, the ground strength estimation unit 116 stores the calculated third matrix data in the estimation information DB 123. The user (administrator) can recognize the estimated value of the ground strength at a predetermined construction location by referring to the estimation information stored in the estimation information DB 123.

[0053] The estimated value of the vertical ground properties at any point in planar space is given by the following equation (7).

number

[0054] where Z * indicates a matrix storing normalized estimated values ​​of vertical ground properties at an arbitrary point in planar space. Next, the ground strength estimation unit 116 restores the normalized estimated values ​​based on the following equation (8).

number

[0055] where X * p denotes the vector that stores the result of undoing the normalization in the p-th row. * p is the matrix Z * Figure 15 shows the vector that stores the data in the pth row of X * p . Also, the denormalized X * p The current value I, oil pressure value p, penetration speed v, and N value are estimated values.

[0056] 16A to 16D are graphs showing the relationship between the estimated values ​​and the observed values ​​(correct values) of the current value I, hydraulic pressure value p, time interval v, and N value, respectively. In FIG. 16D, values ​​from a post-test SPT (Standard Penetration Test) are used as correct values ​​for comparison. As shown in FIGS. 16A to 16D, the ground strength estimation device 100 according to this embodiment calculates appropriate estimated values.

[0057] (Outline of processing flow of ground strength estimation device 100) Next, the flow of processing in the ground strength estimation device 100 will be shown using the flowchart shown in Fig. 17. The series of operations of the ground strength estimation device 100 shown in the flowchart in Fig. 17 starts when the ground strength estimation device 100 is started, and ends when the work is completed. The processing in the flowchart shown in Fig. 17 also ends when the power is turned off or an interrupt occurs to end the processing. In addition, in the following explanation of the flowchart, the same content as that described in the explanation of the above-mentioned ground strength estimation system 10 and ground strength estimation device 100 will be omitted or simplified.

[0058] In step S1701, the observation value information acquisition unit 111 acquires construction data used in a construction method for compacting the ground by constructing pillars underground. The observation value information acquisition unit 111 also stores the acquired construction data in the observation value information DB 121. Then, the process proceeds to step S1702.

[0059] In step S1702, the data preparation processing unit 112 generates first matrix data based on the construction data, and generates second matrix data by normalizing the first matrix data. Specifically, the data preparation processing unit 112 generates first matrix data that summarizes each piece of construction data for the construction order in which the construction was performed. The data preparation processing unit 112 also normalizes the generated first matrix data to generate second matrix data. The normalization process is performed based on the above equation (1). The data preparation processing unit 112 also stores the generated first matrix data and second matrix data in the calculation information DB 122. Thereafter, the process proceeds to step S1703.

[0060] In step S1703, the singular value decomposition processing unit 113 performs singular value decomposition on the second matrix data to calculate first constituent coefficients expressed as products of left singular vectors, singular values, which are matrices in which the singular values ​​are arranged in diagonal terms, and right singular vectors. Specifically, the singular value decomposition processing unit 113 performs singular value decomposition on the second matrix data to calculate left singular vectors U, singular values ​​Σ, and right singular vectors V as shown in the above formula (2). T Furthermore, the singular value decomposition processing unit 113 calculates the calculated left singular vector U, singular value Σ, and right singular vector V T is stored in the calculation information DB 122.

[0061] In step S1703, the singular value decomposition processing unit 113 reduces the dimensions of the singular value decomposed data. obs For Ur, let φr, and ΣrV T r By replacing with Ar, the observation matrix Z obs is substituted into the above equation (3) to calculate the first configuration coefficients. Furthermore, the singular value decomposition processing unit 113 stores the calculated first configuration coefficients in the calculation information DB 122. After that, the process proceeds to step S1704.

[0062] In step S1704, the influence calculation unit 114 calculates the distance influence determined by the horizontal distance between the ground strength estimation point where the ground strength is estimated and each installed pile. The influence calculation unit 114 also stores the calculated distance influence in the calculation information DB 122. Thereafter, the process proceeds to step S1705.

[0063] In step S1705, the composition coefficient estimation unit 115 calculates the relationship between the first composition coefficient and the distance influence degree by regression analysis, and calculates the second composition coefficient for the distance influence degree based on the calculated relationship. The composition coefficient estimation unit 115 also stores the calculated second composition coefficient in the calculation information DB 122. Thereafter, the process proceeds to step S1706.

[0064] In step S1706, the ground strength estimation unit 116 converts the second configuration coefficients into a matrix to calculate third matrix data, and estimates ground strength based on the third matrix data. Specifically, the ground strength estimation unit 116 calculates third matrix data in which the second configuration coefficients estimated by the configuration coefficient estimation unit 115 are arranged. The ground strength estimation unit 116 also stores the calculated third matrix data in the estimation information DB 123. A user (administrator) can recognize the estimated value of the ground strength at a specified construction location by referring to the estimation information stored in the estimation information DB 123. Thereafter, the process proceeds to step S1707.

[0065] In step S1707, the control unit 110 determines whether or not construction has been completed by the compaction pile construction apparatus 20. If the control unit 110 determines in step S1707 that construction has been completed by the compaction pile construction apparatus 20 (step S1707: YES), the processing ends. On the other hand, if the control unit 110 determines in step S1707 that construction has not been completed by the compaction pile construction apparatus 20 (step S1707: NO), the processing returns to step S1701, and the processing from step S1701 is repeated.

[0066] As described above, the ground strength estimation device 100 according to this embodiment estimates the strength of ground constructed by a compaction pile construction device 20, which compacts the ground by constructing pillars underground. The ground strength estimation device 100 includes an observation value information acquisition unit 111 that acquires construction data used by the compaction pile construction device 20. The ground strength estimation device 100 also includes a data preparation processing unit 112 that generates first matrix data based on the construction data and generates second matrix data by normalizing the first matrix data. The ground strength estimation device 100 also includes a singular value decomposition processing unit 113 that performs singular value decomposition on the second matrix data to calculate a first constituent coefficient expressed as the product of a left singular vector, a singular value, and a right singular vector. The ground strength estimation device 100 also includes an influence calculation unit 114 that calculates a distance influence degree determined by the horizontal distance between a ground strength estimation point where the ground strength is to be estimated and each constructed pile. The ground strength estimation device 100 also includes a composition coefficient estimation unit 115 that calculates the relationship between the first composition coefficient and the distance influence degree by regression analysis, and calculates a second composition coefficient for the distance influence degree based on the calculated relationship.The ground strength estimation device 100 also includes a ground strength estimation unit 116 that converts the second composition coefficient into a matrix to calculate third matrix data, and estimates ground strength based on the third matrix data.

[0067] As a result, the ground strength estimation device 100 of this embodiment converts construction data into a matrix and estimates ground strength based on the distance influence degree to each constructed pile, thereby making it possible to accurately estimate the ground strength after construction is completed for the entire construction area.

[0068] Furthermore, the construction data applied to the ground strength estimation device 100 according to this embodiment may include the current value of the rotary drive device 32, the hydraulic pressure value of the lifting device 31, and the penetration speed of the casing pipe 33. This enables the ground strength estimation device 100 to further improve the accuracy of the strength estimation of the ground after construction.

[0069] Furthermore, the construction data applied to the ground strength estimation device 100 according to this embodiment may further include information on the order in which the columns are driven in. This allows the ground strength estimation device 100 to further improve the accuracy of ground strength estimation.

[0070] Furthermore, the method for compacting the ground using the compaction pile construction device 20 according to this embodiment may be a sand compaction method, a static compaction method, a press-in static compaction method, or a compaction grouting method. This allows the ground strength estimation device 100 to estimate ground strength for various compaction methods.

[0071] (Other embodiments) Although the embodiments have been described in detail with reference to the drawings, the present embodiments are not limited to the contents described in the above embodiments. Furthermore, the components described above include those that can be easily imagined by a person skilled in the art and those that are substantially the same. Furthermore, the configurations described above can be combined as appropriate. Furthermore, various omissions, substitutions, or modifications of the configurations can be made without departing from the spirit of the embodiments.

[0072] Furthermore, a computer program (ground strength estimation program) that causes a computer to execute the processing (ground strength estimation method) in the above-described ground strength estimation device 100, and a computer-readable recording medium on which the program is recorded, are included within the scope of this embodiment. Here, any type of computer-readable recording medium may be used. Furthermore, the computer program is not limited to being recorded on the recording medium, and may be transmitted via a telecommunications line, a wireless or wired communication line, a network such as the Internet, or the like.

[0073] (Actions, effects, etc.) The effects of this embodiment will be described below.

[0074] (1) A ground strength estimation device 100 according to a first aspect of this embodiment is a ground strength estimation device 100 that estimates the strength of ground constructed by a compaction pile construction device 20 that compacts the ground by constructing pillar-shaped objects underground. The ground strength estimation device 100 includes an observation value information acquisition unit 111 that acquires construction data used by the compaction pile construction device 20. The ground strength estimation device 100 also includes a data preparation processing unit 112 that generates first matrix data based on the construction data and generates second matrix data by performing a normalization process on the first matrix data. The ground strength estimation device 100 also includes a singular value decomposition processing unit 113 that performs singular value decomposition on the second matrix data and calculates a first constituent coefficient expressed as the product of a left singular vector, a singular value, and a right singular vector. The ground strength estimation device 100 also includes an influence calculation unit 114 that calculates a distance influence degree determined by the horizontal distance between a ground strength estimation point where the ground strength is to be estimated and each constructed pile. The ground strength estimation device 100 also includes a composition coefficient estimation unit 115 that calculates the relationship between the first composition coefficient and the distance influence degree by regression analysis, and calculates a second composition coefficient for the distance influence degree based on the calculated relationship.The ground strength estimation device 100 also includes a ground strength estimation unit 116 that converts the second composition coefficient into a matrix to calculate third matrix data, and estimates ground strength based on the third matrix data.

[0075] With this configuration, the ground strength estimation device 100 converts the construction data into a matrix and estimates the ground strength based on the distance influence degree to each constructed pile, thereby enabling accurate estimation of the ground strength after construction is completed for the entire construction area.

[0076] (2) The construction data applied to the ground strength estimation device 100 relating to the second aspect of this embodiment may include the current value of the rotary drive device 32, the hydraulic pressure value of the lifting device 31, and the penetration speed of the casing pipe 33.

[0077] With this configuration, the ground strength estimation device 100 can further improve the accuracy of the strength estimation of the ground after construction.

[0078] (3) The construction data applied to the ground strength estimation device 100 according to the third aspect of this embodiment may further include information regarding the order in which pillars are cast.

[0079] With this configuration, the ground strength estimation device 100 can further improve the accuracy of ground strength estimation.

[0080] (4) A ground strength estimation system 10 according to a fourth aspect of this embodiment includes a compaction pile construction apparatus 20. The compaction pile construction apparatus 20 is an apparatus that compacts the ground by constructing pillars underground, and includes a casing pipe 33, an elevating device 31 for raising and lowering the casing pipe 33, and a rotary drive device 32 for rotating the casing pipe 33. The ground strength estimation system 10 also includes a ground strength estimation device 100 that estimates the strength of ground constructed by the compaction pile construction apparatus 20. The ground strength estimation device 100 includes an observation value information acquisition unit 111 that acquires construction data used by the compaction pile construction apparatus 20. The ground strength estimation device 100 also includes a data preparation processing unit 112 that generates first matrix data based on the construction data and generates second matrix data by normalizing the first matrix data. The ground strength estimation device 100 also has a singular value decomposition processing unit 113 that performs singular value decomposition on the second matrix data to calculate a first constituent coefficient expressed as the product of a left singular vector, a singular value, and a right singular vector. The ground strength estimation device 100 also has an influence calculation unit 114 that calculates a distance influence determined by the horizontal distance between a ground strength estimation point where ground strength is estimated and each installed pile. The ground strength estimation device 100 also has a constituent coefficient estimation unit 115 that calculates the relationship between the first constituent coefficient and the distance influence by regression analysis and calculates a second constituent coefficient for the distance influence based on the calculated relationship. The ground strength estimation device 100 also has a ground strength estimation unit 116 that converts the second constituent coefficient into a matrix to calculate third matrix data and estimates ground strength based on the third matrix data.

[0081] With this configuration, the ground strength estimation system 10 converts construction data into a matrix and estimates ground strength based on the distance influence degree to each constructed pile, thereby enabling accurate estimation of the ground strength after construction is completed for the entire construction area.

[0082] (5) A ground strength estimation method according to a fifth aspect of this embodiment is a ground strength estimation method that is executed by a computer and estimates the strength of ground constructed using a construction method in which the ground is compacted by constructing pillar-shaped objects underground. The ground strength estimation method performs singular value decomposition based on construction data at the time of casing pipe penetration. The ground strength estimation method also calculates a distance influence degree determined by the horizontal distance between a ground strength estimation point where the ground strength is estimated and each constructed pile. The ground strength estimation method also performs regression analysis based on the relationship between the results of the singular value decomposition and the distance influence degree. The ground strength estimation method also estimates the depthwise ground strength at any point in the construction area based on the results of the regression analysis.

[0083] With this configuration, the ground strength estimation method converts construction data into a matrix and estimates ground strength based on the distance influence degree to each constructed pile, making it possible to accurately estimate the ground strength after construction is completed for the entire construction area.

[0084] (6) The construction data applied to the ground strength estimation method relating to the sixth aspect of this embodiment may include the current value of the rotary drive device 32, the hydraulic pressure value of the lifting device 31, and the penetration speed of the casing pipe 33.

[0085] With this configuration, the ground strength estimation method can further improve the accuracy of strength estimation for the ground after construction.

[0086] (7) The construction data applied to the ground strength estimation method according to the seventh aspect of this embodiment may further include information regarding the order in which the pillars are cast.

[0087] With this configuration, the ground strength estimation method can further improve the accuracy of ground strength estimation. [Explanation of symbols]

[0088] 10. Ground strength estimation system 20 Compaction pile construction equipment 30 Hopper 31 Lifting device 32 Rotational drive unit 33 Casing pipe 100 Ground strength estimation device 110 control section 111 Observation information acquisition unit 112 Data preparation processing unit 113 Singular Value Decomposition Processing Unit 114 Impact calculation part 115 Composition coefficient estimation section 116 Ground Strength Estimation Section 120 Storage section 121 Observation Information DB 122 Calculation Information DB 123 Estimated Information DB 130 Input / Output Interface 140 Communication Interface

Claims

1. A ground strength estimation device that estimates the strength of ground constructed by a compaction pile construction device that compacts the ground by constructing pillar-shaped objects underground, an observation value information acquisition unit that acquires construction data used in the compaction pile construction device; a data preparation processing unit that generates first matrix data based on the construction data and generates second matrix data by performing normalization processing on the first matrix data; a singular value decomposition processing unit that performs singular value decomposition on the second matrix data to calculate first constituent coefficients expressed as products of left singular vectors, singular values, and right singular vectors; an influence degree calculation unit that calculates a distance influence degree determined by the horizontal distance between a ground strength estimation point where ground strength is estimated and each installed pile; a composition coefficient estimating unit that calculates a relationship between the first composition coefficient and the distance influence degree by regression analysis, and calculates a second composition coefficient for the distance influence degree based on the calculated relationship; a ground strength estimation unit that calculates third matrix data by converting the second configuration coefficients into a matrix and estimates ground strength based on the third matrix data; A ground strength estimation device comprising:

2. The ground strength estimation device according to claim 1 , wherein the construction data includes a current value of a rotary drive device, a hydraulic pressure value of a lifting device, and a penetration speed of a casing pipe.

3. The ground strength estimation device according to claim 2 , wherein the construction data further includes information regarding the order in which columns are cast.

4. A compaction pile construction device for compacting the ground by constructing pillar-shaped objects underground, the compaction pile construction device having a casing pipe, an elevating device for elevating the casing pipe, and a rotary drive device for rotating the casing pipe; and a ground strength estimation device for estimating the strength of the ground constructed by the compaction pile construction device, The ground strength estimation device includes: an observation value information acquisition unit that acquires construction data used in the compaction pile construction device; a data preparation processing unit that generates first matrix data based on the construction data and generates second matrix data by performing normalization processing on the first matrix data; a singular value decomposition processing unit that performs singular value decomposition on the second matrix data to calculate first constituent coefficients expressed as products of left singular vectors, singular values, and right singular vectors; an influence degree calculation unit that calculates a distance influence degree determined by the horizontal distance between a ground strength estimation point where ground strength is estimated and each installed pile; a composition coefficient estimating unit that calculates a relationship between the first composition coefficient and the distance influence degree by regression analysis, and calculates a second composition coefficient for the distance influence degree based on the calculated relationship; a ground strength estimation unit that calculates third matrix data by converting the second configuration coefficients into a matrix and estimates ground strength based on the third matrix data; A ground strength estimation system having the above structure.

5. A ground strength estimation method executed by a computer for estimating the strength of ground constructed by a construction method of compacting the ground by constructing pillars underground, comprising: Singular value decomposition is performed based on the construction data during casing pipe penetration, Calculating the distance influence degree determined by the horizontal distance between the ground strength estimation point where the ground strength is estimated and each installed pile; performing a regression analysis based on a relationship between the result of the singular value decomposition and the distance influence degree; A ground strength estimation method for estimating the depthwise ground strength at any point in a construction area based on the results of the regression analysis.

6. The method for estimating ground strength according to claim 5 , wherein the construction data includes a current value of a rotary drive device, a hydraulic pressure value of a lifting device, and a penetration speed of a casing pipe.

7. The ground strength estimation method according to claim 6, wherein the construction data further includes information regarding the order in which columns are installed.

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