Pile construction management method and pile construction management device

Abstract

The objective is to provide a pile construction management method and a pile construction management device that enable efficient pile driving work in foundation pile construction. [Solution] The method includes: a step of creating a support layer model data that models the support layer at the pile driving site based on the support layer depth information of the ground investigation site; a step of setting the pile length for each pile driving site based on the support layer model data created in the support layer model data creation step; a reliability setting step that sets the reliability of the depth from the base surface to the support layer surface for each pile driving site based on the relationship between the ground investigation site and the pile driving site; and a construction plan creation step that creates a construction plan related to pile driving based on the level of reliability set in the reliability setting step.

Description

Technical Field

[0001] The present invention relates to a pile construction management method and a pile construction management device in foundation pile work.

Background Art

[0002] Conventionally, in foundation pile work, ground surveys such as boring surveys are carried out in advance on the piling target site, support layer model data showing the overall picture of the support layer expected at the piling target site is created from the support layer depth information at a large number of ground survey points obtained by the ground surveys, the pile length is set for each piling point based on the support layer model data, and during actual piling construction, the piling operation is performed while updating the support layer model data using the depth of the support layer obtained by confirming the position of the support layer with an integrating ammeter or the like (for example, see Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, in Patent Document 1, although it is possible to update the support layer model data in real time based on information obtained during construction, or to collect and visualize the support layer model data, no specific index for quantitatively evaluating the reliability of the support layer model data has been introduced, and the judgment on the necessity of additional surveys remains only qualitative. In addition, the improvement of prediction accuracy through feedback of construction data is also limited, and there is room for improvement in optimizing the balance between geological survey costs and construction reliability, so problems remain in carrying out piling operations efficiently. Therefore, in view of the various problems described above, the present invention aims to provide a pile construction management method and a pile construction management device that enable efficient pile driving work in foundation pile construction by quantitatively evaluating the reliability of the bearing layer model data and optimizing the pile driving construction plan based on the evaluation results. [Means for solving the problem]

[0005] To solve the above problems, the method for managing pile construction in foundation pile work includes the following steps: creating a bearing layer model data based on bearing layer depth information at ground investigation sites to model the bearing layer at the pile driving site; setting the pile length for each pile driving site based on the bearing layer model data created in the bearing layer model data creation step; setting the reliability level for the depth from the base surface to the bearing layer for each pile driving site based on the relationship between the ground investigation sites and the pile driving sites; and creating a construction plan based on the level of reliability set in the reliability setting step to create a construction plan for pile driving. According to this embodiment, the reliability of the bearing layer model data can be quantitatively evaluated, and the pile driving construction plan can be optimized based on the evaluation results, thereby enabling efficient pile driving work and allowing for a review of the overall pile length at the pile driving site or the proposal of additional investigations. Furthermore, as another embodiment of the pile construction management method, the method may include a support layer model data update step which updates the support layer model data by adding information on the depth to which the pile reaches the support layer for each pile driving point, obtained during the pile driving work, as support layer depth information; a pile length determination step which determines whether the pile length for each pile driving point set in the pile length setting step is excessive or insufficient based on the support layer model data updated in the support layer model data update step; a reliability update step which updates the reliability set in the reliability setting step based on the excess or insufficient state of the pile length determined in the pile length determination step; and a construction plan update step which updates the construction plan related to pile driving based on the level of reliability updated in the reliability update step. Alternatively, the reliability update step may update the reliability set in the reliability setting step based on whether or not the pile length has been changed within a predetermined range, the number of times the pile length has been changed, or both, in addition to the excess or insufficient state of the pile length. According to this embodiment, pile driving work can be carried out more efficiently, and it is possible to review the overall pile length at the pile driving site or propose additional investigations. To solve the above problems, the pile construction management device for foundation pile construction comprises: a means for creating bearing layer model data that models the bearing layer at the pile driving site based on bearing layer depth information at the ground investigation site; a means for setting the pile length for each pile driving site based on the bearing layer model data created by the bearing layer model data creation means; a reliability setting means that sets the reliability of the depth from the base surface to the bearing layer for each pile driving site based on the relationship between the ground investigation site and the pile driving site; and a construction plan creation step that creates a construction plan related to pile driving based on the level of reliability set by the reliability setting means. This configuration allows for efficient pile driving work and enables a review of the overall pile length at each pile driving site, as well as the proposal of additional investigations. Furthermore, as an alternative configuration for the pile construction management device, the device may include a support layer model data update means that updates the support layer model data by adding information on the depth to which the pile reaches the support layer for each pile driving point, acquired during pile driving work, as support layer depth information; a pile length determination means that determines whether the pile length for each pile driving point is excessive or insufficient, as set by the pile length setting means, based on the support layer model data updated by the support layer model data update means; a reliability update means that updates the reliability set by the reliability setting means based on the excess or insufficient state of the pile length determined by the pile length determination means; and a construction plan update means that updates the construction plan related to pile driving based on the level of reliability updated by the reliability update means. Alternatively, the reliability update means may be configured to update the reliability set by the reliability setting means based on whether or not the pile length has been changed within a predetermined range, the number of times the pile length has been changed, or both, in addition to the excess or insufficient state of the pile length. [Brief explanation of the drawing]

[0006] [Figure 1] This figure shows a flowchart of the pile construction management method according to this embodiment. [Figure 2] This figure shows an example of the hardware configuration of a pile construction management device. [Figure 3] This is a block diagram showing the configuration of a pile construction management device. [Figure 4] This is a diagram showing the support layer model. [Figure 5] This figure shows a confidence contour map and priority map, which indicate the contour lines of the confidence scores set for each pile-driving location.

[0007] The present invention will be described in detail below through embodiments of the invention. However, these embodiments are not intended to limit the invention as defined in the claims, and not all combinations of features described in the embodiments are essential to the solution of the invention; rather, they include configurations that can be selectively adopted. [Modes for carrying out the invention]

[0008] Figure 1 is a flowchart of the pile construction management method according to this embodiment. As shown in Figure 1, the pile construction management method according to this embodiment comprises a bearing layer model data creation step S110, a pile length setting step S120, a reliability setting step S130, a priority map creation step S140, a construction plan creation step S150, a pile driving information acquisition step S160, a bearing layer model data update step S170, a pile length determination step S180, a pile length change step S190, a reliability update step S200, a priority map update step S210, and a construction plan update step S220. Each of these steps, S110 to S220, is carried out by the pile construction management device 1 shown in Figures 2 and 3.

[0009] Figure 2 shows an example of the hardware configuration of the pile construction management device 1. The pile construction management device 1 is a so-called computer and includes a CPU or other arithmetic processing means 51 provided as hardware resources, storage means 52 such as ROM and RAM, external input / output means (external IF means) 53 that enable direct connection with external devices, communication means 54 that enable communication with external devices wirelessly or via wired connections, display means 55 such as a monitor, and input means 56 that enable input of commands and other information regarding processing by the arithmetic processing means 51.

[0010] The pile construction management device 1 may consist of a single computer, or it may be configured for distributed processing using multiple computers. Furthermore, the form of the pile construction management device 1 may be any of the following: a mobile device such as a smartphone or tablet, or a computer such as a notebook computer.

[0011] The pile construction management device 1 functions as a bearing layer model data creation means 110, a pile length setting means 120, a reliability setting means 130, a priority map creation means 140, a construction plan creation means 150, a pile driving information acquisition means 160, a bearing layer model data update means 170, a pile length determination means 180, a pile length change means 190, a reliability update means 200, a priority map update means 210, and a construction plan update means 220, by having the calculation processing means 51 execute each process according to the program stored in the storage means 52.

[0012] The bearing layer model data creation means 110 creates bearing layer model data that predicts the shape of the bearing layer surface for the entire pile-driving site, based on bearing layer depth information (bearing layer depth information linked to location information) from numerous ground investigation points (also called boring points) obtained from boring investigations (an example of ground investigation) on the pile-driving site.

[0013] The bearing layer model data is configured to be displayed on the display means 55 as a three-dimensional bearing layer model, based on bearing layer depth information from numerous ground investigation sites obtained from boring surveys. This is done by interpolation or extrapolation, for example, by using the bearing layer depth at the midpoint between adjacent ground investigation sites as the midpoint of the bearing layer depths of adjacent investigation sites. In other words, the bearing layer model data is a list of numerous setting sites on the bearing layer surface, including ground investigation sites, in a three-dimensional coordinate system of X, Y, and Z. The designated area refers to, for example, a plot of land to be piled up, which is divided into equal sections of a predetermined size.

[0014] The supporting layer model M can, for example, be displayed in three dimensions, and as shown in Figure 4, the depth (depth position) of the upper surface level of the supporting layer in the ground can be represented by contour lines. The supporting layer model M is not limited to being displayed on the display means 55 with contour lines, and may also be represented with different colors and shades for each depth range of the contour lines.

[0015] The pile length setting unit 120 sets the pile length for each pile driving point based on the support layer model data created by the support layer model data creation unit 110. The pile length can be set, for example, by identifying the planar position of the pile driving point on the support layer model data from the pile position information such as a pile position diagram showing the planar position of the pile driving point stored in the storage unit 52, and performing an operation such as adding a predetermined penetration amount of the pile tip to the depth (length) from the foundation surface to the support layer surface at each pile driving point.

[0016] The reliability setting unit 130 sets the reliability for the depth from the foundation surface to the support layer surface at each pile driving point, which is calculated when the pile length is set by the pile length setting unit 120. The reliability at each pile driving point is calculated, for example, as a borehole survey density score (sometimes simply referred to as a survey density score) based on the relationship between each pile driving point and the borehole point. The relationship of the borehole point to each pile driving point refers to the distance (by interpolation, extrapolation, etc.) from the borehole point to the pile driving point, the number of borehole points surrounding the pile driving point, and the like.

[0017] For the borehole survey density score, for example, a high score can be set as high reliability when the distance to the pile driving point is short, and a low score can be set as low reliability when the distance is long. Further, for the borehole survey density score, a high score can be set as high reliability when the number of borehole points surrounding the pile driving point is large, and a low score can be set as low reliability when the number is small such as one. Further, the borehole survey density score may be set by combining scores set based on the distance to the pile driving point and the number of borehole points surrounding the pile driving point. A calculation example of the survey density score will be described in detail in the description of the reliability updating unit 200 later. The survey density score calculated by the reliability setting unit 130 can be treated as a reliability score indicating the reliability of the depth from the foundation surface to the support layer surface set at each pile driving point.

[0018] Figure 5(a) is a confidence contour map showing an example of an isosurface for the confidence score. Note that the shape of the pile-driving site, the spacing of pile-driving points, the number and location of boring points shown in the figure are for illustrative purposes only and are not limited to these. The confidence contour map shown in Figure 5(a) can draw contour lines of the confidence score on the pile-driving area based on the confidence score set for each pile-driving point by the confidence setting means 130.

[0019] Figure 5(b) shows an example of a priority map. The priority map creation means 140 creates a priority for pile driving work in the pile driving target area based on the reliability score at each pile driving site created by the reliability setting means 130, and displays it as a priority map on the display means 55. As shown in Figure 5(b), the priority map displays the pile driving site, ground investigation site, pile driving site, and contour lines of the confidence score, and a number indicating the priority (order) of the pile driving work is displayed next to (near) each pile driving site. The priority numbers should be set so that, for example, pile driving work begins first at pile driving sites with lower confidence scores. For example, in pile driving operations, the piles to be driven are prepared in advance based on the pile length calculated using the bearing layer model data initially created based on ground investigations conducted by boring. Therefore, by starting the pile driving operation from the pile driving site with the lowest confidence score, as mentioned above, if there is an excess or deficiency in the length of the piles, the pile driving operation can be continued by using a suitable pile from the prepared piles. Furthermore, the information displayed on the priority map is not limited to what has been described above; it may be modified as needed, as long as it includes at least the pile driving locations and a number indicating the priority of the pile driving work (which shows the order of the pile driving work).

[0020] The construction plan creation means 150 creates a construction plan for pile driving work at the pile driving site based on the priorities created by the priority map creation means 140. In this context, a construction plan refers to setting the starting point for pile driving on the site and the direction in which the pile driving will proceed. The construction plan creation method 150 assigns higher priority to areas with lower reliability scores (smaller scores), and by formulating a construction plan to prioritize construction in areas with low reliability, efficient pile driving work becomes possible. The area referred to here may be the aforementioned set area, or it may be a division of the pile driving site into predetermined areas, for example, smaller or larger than the set area.

[0021] The pile driving information acquisition means 160 acquires the depth reached by the supporting layer (supporting layer depth information associated with the pile driving point) obtained by confirming the position of the supporting layer surface using an integrating current meter or the like during the actual pile driving construction, for each pile driving point, and stores it as supporting layer depth information in the storage means 52.

[0022] The bearing layer model data update means 170 adds the actual bearing layer depth obtained by the pile driving information acquisition means 160 to the bearing layer model data and updates it as new bearing layer model data. The updated support layer model data is stored in the storage means 52 as new support layer model data. At this time, the support layer model data before the update is retained in the storage means 52 as history.

[0023] The pile length determination means 180 determines whether the pile length at each pile driving point (the current pile length set at that time) set in the pile length setting step S120 is excessive or insufficient, based on the support layer model data updated by the support layer model data update means 170.

[0024] The pile length changing means 190 changes the pile length for each pile driving location based on the determination result of the pile length determination means 180. In this way, each time the bearing layer model data is updated, the pile length is changed based on the determination result of the pile length determination means 180, allowing subsequent pile driving work to be carried out appropriately and efficiently.

[0025] The reliability update means 200 updates the information on the depth reached of the bearing layer before pile driving using the actual depth reached of the bearing layer obtained by the pile driving information acquisition means 160, and calculates the reliability of the depth from the base surface to the bearing layer at each pile driving point. The reliability update means 200 calculates a change history score by selectively using the pile length determination means 180's determination of whether the pile length is excessive or insufficient, whether the pile length has been changed within a predetermined range, the number of times the pile length has been changed, etc. The reliability setting means 130 then calculates a new reliability score by adding the change history score to the reliability score recorded as the boring survey density score.

[0026] The reliability update means 200 calculates a reliability score based on the pile length determination status (whether the pile length is excessive or insufficient), whether the pile length has been changed, the number of times the pile length has been changed within a predetermined range, etc., as determined by the pile length determination means 180, and determines the reliability. The processing in the reliability setting means 130 and the reliability update means 200 will be described below. The confidence score (TS) can be calculated, for example, using the following formula: TS = (DS × CS) ÷ 130 Here, TS: Confidence Score (Overall score, expressed on a scale of 0 to 100) DS: Survey Density Score (Score based on boring survey density) CS: Change History Score (Score based on pile length change history) 130: Normalization coefficient (Since the theoretical maximum value is 13000, it is converted to a 100-point scale)

[0027] The survey density score (DS) is calculated from the relationship between pile driving locations and boring locations. For example, if the distance from the nearest boring point is less than 10m: DS = 100 (high reliability), Distance 10m~20m: DS = 80 Distance 20m~30m: DS = 60 Distance of 30m or more: DS = 40 (low reliability) Furthermore, for extrapolation, multiply by a coefficient of 0.7, and for interpolation, apply a coefficient of 1.0. Additionally, adjustments are made based on the number of boring points surrounding the pile-driving site: If enclosed by 4 or more points: Multiply by a coefficient of 1.3. If enclosed by 3 points: Multiply by a coefficient of 1.2 If enclosed by two points: Multiply by a coefficient of 1.1 If the score is 1 or less: No correction applied. That's what I decided.

[0028] The Change History Score (CS) is calculated based on the changes made to the pile length. for example, No change in pile length: CS = 100 (high reliability) Pile length changed once and change amount less than 0.5m: CS = 90 Pile length changed once, with a change of 0.5m or more and less than 1.0m: CS = 70 Pile length changed once and change amount of 1.0m or more: CS = 50 Pile length changed more than twice: CS = 30 (low reliability) Furthermore, corrections are made based on changes in the pile lengths of other piles within a predetermined range (e.g., within a radius of 30m): No changes in the surrounding area: No corrections. Changes observed in 1-3 stakes in the surrounding area: Multiply by coefficient 0.9 Changes observed in 4 or more stakes in the surrounding area: Multiply by coefficient 0.7 It was decided that it would be done.

[0029] For example, if a pile at point A is interpolated at a distance of 15m to the nearest boring point (DS=80×1.0), surrounded by three boring points (coefficient 1.2), has undergone one pile length change of 0.7m (CS=70), and two surrounding piles have also been changed (coefficient 0.9), the confidence score is calculated as follows: DS = 80 × 1.0 × 1.2 = 96 CS = 70 × 0.9 = 63 TS = (96 × 63) ÷ 130 = 46.6 This score is expressed on a scale of 100 points, meaning a higher value indicates higher reliability, and a lower value indicates lower reliability. In this example, the confidence score is 46.6 points, which can be evaluated as moderate reliability. Based on the confidence scores calculated in this way, a priority map is created. Areas with lower confidence scores (smaller scores) are given higher priority, and by designing a construction plan to prioritize construction in areas with low reliability, efficient pile driving work becomes possible.

[0030] In the example of calculating the confidence score mentioned above, a higher confidence score indicated higher reliability, and a lower score indicated lower reliability. However, you may also set the values ​​so that a lower confidence score indicates higher reliability, and a higher score indicates lower reliability.

[0031] The priority map update means 210 creates a priority for pile driving work for the pile driving target area based on the confidence score at each pile driving site updated by the confidence update means 200, updates the priority map before pile driving, and displays the new priority map on the display means 55.

[0032] The construction plan update means 220 creates a new construction plan for pile driving work at the pile driving site based on the priority updated by the priority map update means 210, and updates the construction plan before the pile driving work.

[0033] The operation of the pile construction management device 1 will be explained according to the processing flow of the pile construction management device 1 shown in Figure 1. In the bearing layer model data creation step S110, bearing layer model data is created that predicts the shape of the bearing layer surface for the entire pile-driving site, based on bearing layer depth information from numerous ground investigation points obtained from boring surveys (an example of ground investigation) for the pile-driving site. Next, in the pile length setting step S120, the pile length for each pile driving location is set based on the bearing layer model data created in the bearing layer model data creation step S110. The pile length for each pile driving location set here is determined by adding a predetermined penetration amount of the pile tip to the depth (length) from the bedrock surface to the bearing layer surface at each pile driving location. Next, in the confidence setting step S130, a confidence score is calculated for the depth from the base surface to the supporting layer surface at each pile driving site. Next, in the priority map creation step S140, priorities for pile driving work are created for the pile driving target area based on the confidence score at each pile driving site created in the confidence setting step S130, and these priorities are displayed on the display means 55 as a priority map. Next, in the construction plan creation step S150, a construction plan for pile driving work at the pile driving site is created based on the priorities created in the priority map creation step S140. Next, in the pile driving information acquisition step S160, the pile construction company, etc., acquires the depth to which the piles reach the bearing layer, which is actually obtained through pile driving work at each pile driving site, as bearing layer reach information. Next, in the bearing layer model data update step S170, the actual bearing layer depth obtained in the pile driving information acquisition step S160 is added to the bearing layer model data to update the bearing layer model data, and the new bearing layer model data is stored in the storage means 52. Next, in the pile length determination step S180, based on the new bearing layer model data updated in the bearing layer model data update step S170, the system determines whether the pile length for each pile driving location (the current pile length set at that time) set in the pile length setting step S120 is excessive or insufficient. Next, in the pile length change step S190, the pile length for each pile driving location is set and changed based on the determination result in the pile length determination step S180. Next, in the confidence update step S200, the information on the depth reached of the bearing layer before pile driving is updated using the actual depth reached of the bearing layer obtained in the pile driving information acquisition step S160, and a confidence score is calculated for the depth from the base surface to the bearing layer surface at each pile driving point. The reliability update means 200 calculates a change history score based on the pile length determination means 180's determination of whether the pile length is excessive or insufficient, whether the pile length has been changed, the number of times the pile length has been changed within an adjacent predetermined range, etc., and sets a new reliability score by adding the reliability score recorded as the boring survey density score by the reliability setting means 130 to the change history score. Next, in the priority map update step S210, based on the new confidence scores at each pile location updated in the confidence update step S200, a priority order for pile driving work is created for the pile driving target area and displayed on the display means 55 as a new priority map. Next, in the construction plan update step S220, the construction plan for the pile driving work at the pile driving site is modified and updated based on the priorities updated in the priority map update step S210. Then, the steps from the pile driving information acquisition step S160 to the construction plan update step S220 should be repeated until all pile driving is completed.

[0034] As described above, in the pile construction management method according to this embodiment, by introducing survey density score and change history score as quantitative evaluation indicators for the results of boring surveys and pile driving construction, it has become possible to objectively and quantitatively evaluate the reliability of the bearing layer model data. Furthermore, by dynamically updating the construction plan based on the distribution of confidence scores, dynamic construction management of pile driving based on reliability, and prioritizing construction in areas with low reliability, efficient pile driving work becomes possible. In other words, according to the pile construction management method, the accuracy of the bearing layer model data is improved as the pile construction progresses, and the pile length is revised accordingly to an appropriate level. By properly constructing a large number of piles on a large site, pile construction can be carried out more efficiently with less effort. [Explanation of Symbols]

[0035] 1. Pile construction management device, 110. Bearing layer model data creation means, 120. Pile length setting means, 130 Means for setting reliability level, 140 Means for creating priority map, 150 Means for creating construction plan, 160 Information acquisition means, 170 Support layer model data update means, 180 Pile length determination means, 190 Stake length changing means, 200 Reliability updating means, 210 Priority map updating means, 220. Means for updating construction plans.

Claims

1. A step to create a bearing layer model data that models the bearing layer at the pile driving site based on bearing layer depth information at the ground investigation site, The pile length setting step involves setting the pile length for each pile driving location based on the bearing layer model data created in the bearing layer model data creation step, A reliability setting step in which a reliability level is set for the depth from the base surface to the bearing layer for each pile driving site based on the relationship between the aforementioned ground investigation site and the aforementioned pile driving site, A construction plan creation step, which creates a construction plan for pile driving based on the level of confidence set in the confidence level setting step, A pile construction management method including the following.

2. A support layer model data update step involves updating the support layer model data by adding the information on the depth to which the piles reach the support layer at each pile driving point, obtained during the pile driving work, as the support layer depth information, and The system includes a pile length determination step that determines whether the pile length is excessive or insufficient for each pile driving location, as set in the pile length setting step, based on the support layer model data updated in the support layer model data update step. A reliability update step updates the reliability level set in the reliability setting step based on the pile length surplus or deficit status determined in the pile length determination step, A construction plan update step, in which the construction plan for pile driving is updated based on the level of reliability updated in the aforementioned reliability update step, A pile construction management method according to claim 1, including the following:

3. The pile construction management method according to claim 2, wherein the reliability update step updates the reliability set in the reliability setting step based on the presence or absence of a change in pile length within a predetermined range, the number of times the pile length has been changed, or both, in addition to the presence or absence of a change in pile length within a predetermined range.

4. A means for creating a bearing layer model data that models the bearing layer at a pile driving site based on bearing layer depth information at a ground investigation site, A pile length setting means sets the pile length for each pile driving location based on the support layer model data created by the support layer model data creation means, A reliability setting means that sets a reliability level for the depth from the base surface to the bearing layer for each pile driving site based on the relationship between the aforementioned ground investigation site and the aforementioned pile driving site, A construction plan creation step in which a construction plan for pile driving is created based on the level of reliability set by the reliability setting means, A pile construction management device equipped with this device.

5. A support layer model data update means updates the support layer model data by adding the information on the depth to which the pile reaches the support layer for each pile driving point, obtained during pile driving work, as support layer depth information, The system includes a pile length determination means that determines whether the pile length is excessive or insufficient at each pile driving point, as set by the pile length setting means, based on the support layer model data updated by the support layer model data update means. A reliability update means updates the reliability level set by the reliability setting means based on the pile length surplus or deficit status determined by the pile length determination means, A construction plan updating means updates the construction plan related to pile driving based on the level of reliability updated by the reliability updating means, The pile construction management device according to claim 4, including the following:

6. The pile construction management device according to claim 5, wherein the reliability updating means updates the reliability set by the reliability setting means based on the presence or absence of a change in pile length within a predetermined range, the number of times the pile length has been changed, or both, in addition to the state of excess or deficiency of the pile length.

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