Subsidence amount estimation method, building reinforcement method, and display control device

Abstract

The present invention aims to provide a method for estimating the amount of subsidence, a building reinforcement method, and a display control device that can estimate the amount of subsidence with high accuracy regardless of the number of layers expected to subside, while keeping costs down. [Solution] The method includes steps of identifying the lower and upper end points of each of multiple expected subsidence layers at multiple set positions BP, constructing a virtual ground model including multiple expected subsidence layers, and calculating the expected amount of subsidence at multiple expected pile driving positions PP from the virtual ground model.

Description

[Technical Field]

[0001] The present disclosure relates to a subsidence amount estimation method, a building reinforcement method, and a display control device. [Background technology]

[0002] Piles are sometimes driven into the ground as part of the foundation structure of a building. If the ground into which the piles are driven contains soft ground, the piles may settle after being driven depending on the layer where settlement is expected (subsidence expected layer). When constructing a building, measures have been taken to prevent pile settlement by increasing the number of piles (using multiple piles), or by allowing the piles to settle and designing the foundation structure after estimating the amount of pile settlement. Patent Document 1, an example of prior art, discloses a technology that compiles actual load test results by geology and in relation to the characteristics of the ground, particularly the N-value, and then uses this to compile the relationship between load and settlement from a small number of actual measurements, making it possible to rationally estimate the settlement of embedded piles using the load transfer method. Furthermore, Patent Document 2, an example of prior art, discloses a technology that can predict the amount of subsidence of the ground and structures after liquefaction caused by an earthquake, targeting the ground on which a structure is located. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 11-13047 [Patent Document 2] Japanese Patent Application Laid-Open No. 2007-9558 Summary of the Invention [Problem to be solved by the invention]

[0004] When measures are taken to prevent the piles from sinking by increasing the number of piles, there is a problem in that costs increase. On the other hand, there is a problem that when the amount of settlement of a pile is estimated by allowing for settlement using conventional techniques, it takes time and costs money. Furthermore, in the conventional technology, the amount of subsidence is estimated only at a representative position in the ground, which poses a problem that unexpected subsidence may occur in parts other than the representative position. Furthermore, in the past, no consideration had been given to cases where there are multiple layers in the depth direction that correspond to the subsidence expected layer in multiple strata. Therefore, there was room for improvement in the method of estimating the amount of subsidence when there are multiple layers that are expected to subside.

[0005] The present disclosure has been made in consideration of the above-mentioned circumstances, and aims to provide a method for estimating the amount of subsidence, a building reinforcement method, and a display control device that can accurately estimate the amount of subsidence regardless of the number of layers expected to subside, while keeping costs down. [Means for solving the problem]

[0006] The display control method disclosed herein includes the steps of identifying the lower and upper end points of each of a plurality of expected subsidence layers at a plurality of set positions, constructing a virtual ground model including the plurality of expected subsidence layers, and calculating the expected amount of subsidence in each of the plurality of expected subsidence layers at a plurality of expected pile driving positions from the virtual ground model. [Effects of the Invention]

[0007] According to the present disclosure, it is possible to provide a method for estimating the amount of subsidence, a building reinforcement method, and a display control device that can estimate the amount of subsidence with high accuracy regardless of the number of layers expected to subside, while reducing costs. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 2 is a plan view of the ground in the embodiment. [Figure 2] 1 is a flowchart of a subsidence amount estimation method according to an embodiment. [Figure 3] 1 is a schematic diagram of a boring log at a plurality of set locations in an embodiment; FIG. [Figure 4] 10A and 10B are enlarged partial views of boring logs at multiple set locations in an embodiment. [Figure 5] FIG. 2 is a schematic diagram of a virtual ground model according to the embodiment. [Figure 6] 1 is a flowchart of a building reinforcement method according to an embodiment. [Figure 7A] 1 is a block diagram of a display control device according to an embodiment. [Figure 7B] FIG. 2 is a block diagram of a control unit included in the display control device according to the embodiment. [Figure 8] 10 is a first example of information displayed by a display unit in the embodiment. [Figure 9] 10 is a second example of information displayed by the display unit in the embodiment. [Figure 10] 10 is a first example of information displayed by a display unit in the embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, a subsidence amount estimation method, a building reinforcement method, and a display control device according to an embodiment of the present disclosure will be described with reference to the drawings.

[0010] (Method for estimating subsidence amount) FIG. 1 is a plan view of the ground G in this embodiment. The settlement estimation method according to this embodiment is a method for estimating the amount of settlement of piles P, which are driven into the ground G in multiple numbers and form part of the foundation of a building, as shown in FIG. 1. Using this method, for example, the additional stress acting on a foundation beam B provided between multiple piles P and the deformation angle of the foundation beam B due to the additional stress are calculated. This allows the amount of settlement of the piles P to be estimated and, for example, differential settlement of a building to be suppressed. Differential settlement is a phenomenon in which each position of a building (a building's foundation) settles unevenly. When differential settlement occurs, not only does the building simply sink, but settlement that causes the building to tilt occurs. Therefore, a building experiencing differential settlement may experience inconveniences in use, such as tilting floors, and the uneven force applied thereto may also cause damage to structural members.

[0011] 2 is a flowchart of the method for estimating the amount of subsidence according to this embodiment. This method for estimating the amount of subsidence may be realized, for example, by information processing on a computer. The method for estimating the amount of subsidence according to this embodiment includes the following first to third steps. The first step SA1 of estimating the amount of subsidence shown in FIG. 2 is a step of identifying the lower end point and the upper end point of each of the plurality of assumed subsidence layers at the plurality of set positions BP shown in FIG. The subsidence expected layer refers to a layer among the multiple layers included in the ground G shown in Figure 1 in which the subsidence of the driven pile P is expected. The subsidence expected layer includes soft ground. In this embodiment, the subsidence expected layer includes at least one of a clay layer and a silt layer. The clay layer is a layer made up of soil particles with a particle size of 0.005 mm or less, and the silt layer is a layer made up of soil particles with a particle size of 0.075 to 0.005 mm.

[0012] In this embodiment, among the multiple strata, there are multiple layers in the depth direction that are considered to be subsidence layers. Specifically, the number of subsidence layers in this embodiment is three. The number of subsidence layers indicates that three of the multiple strata included in the ground G are considered to be subsidence layers. The number of subsidence layers is not limited as long as it is two or more.

[0013] FIG. 3 is a schematic diagram of boring logs Bc at a plurality of set positions BP in this embodiment. In the first step SA1 of estimating the amount of subsidence, first, as shown in Figures 1 and 3, a plurality of set positions BP are determined in the ground G, each of which specifies the lower end point BPb and the upper end point BPt of each of a plurality of assumed subsidence layers SL. In this embodiment, the set positions BP are positions in the ground G where a boring survey is conducted before the construction of a building. The set positions BP may be determined manually. The lower end point BPb and the upper end point BPt of each of the plurality of assumed subsidence layers SL at the plurality of set positions BP are preferably identified based on the boring log Bc. That is, by conducting boring surveys at the plurality of set positions BP, the positions of the lower end point BPb and the upper end point BPt of each of the plurality of assumed subsidence layers SL at the plurality of set positions BP are extracted, as shown in FIG. 3. This extraction may be performed by a human or a computer. If performed by a human, the human may input the extraction results into the computer. In this embodiment, the setting positions BP are the positions shown in FIG. 1, and six positions are set, namely, a first setting position BP1 to a sixth setting position BP6. In the example shown in Fig. 3, the subsidence expected layer SL is the shaded area, and the layers sandwiching the subsidence expected layer SL above and below are supporting layers SH. The supporting layers SH may be hard ground.

[0014] The determination of whether the ground is soft or hard is made by measuring the N-value through a boring survey. The higher the N-value, the harder the ground can be determined to be. In this embodiment, a layer with a low N-value is determined as a subsidence-prone layer SL. The N-value is an index of the hardness of the ground, and may be measured, for example, by a standard penetration test.

[0015] In this embodiment, the boring survey at the set position BP is carried out to a depth of 90 m. Therefore, in this embodiment, the length L1 in the boring log shown in Figure 3 indicates 90 m, and shows the survey results from the ground surface to a depth of 90 m. There is no limit to the depth at which a boring survey can be conducted, but in strata deeper than 100 m from the surface, even if there is a subsidence expected layer SL, it is far from the point of application of the force and the force is dispersed, so it is thought that the impact on the amount of subsidence will be minimal. Therefore, the depth at which a boring survey can be conducted may be 100 m or less from the surface.

[0016] FIG. 4 is a partial enlarged view of region A shown in FIG. In this embodiment, the vertical length of the subsidence assumed layer SL is divided into a plurality of reference lengths X and one fractional length Y that is shorter than the reference length X, as shown in Fig. 4. That is, for example, as shown in Fig. 4, the vertical length Z (Za1) of the subsidence assumed layer SL (first subsidence assumed layer D1) is expressed by the following equation, where a is an arbitrary natural number. Z=aX+Y That is, the vertical length Z of the subsidence assumed layer SL may be expressed by adding a fractional length Y to a multiplied value of the reference length X. For example, as shown in Fig. 3, if the vertical lengths Z of the subsidence assumed layer SL (first subsidence assumed layer D1) at the first set position BP1, the second set position BP2, and the third set position BP3 among the multiple set positions BP are Za1, Zb2, and Zc3, respectively, Za1, Zb2, and Zc3 can be expressed by the following equations, respectively. Za1=aX+Y1 Zb2=bX+Y2 Zc3=cX+Y3 In the above formula, a, b, and c are natural numbers. In this way, by managing the multiple vertical lengths Z of the subsidence assumed layer SL at the multiple setting positions BP based on one reference length X, it becomes easier to compare the vertical lengths Z of the multiple subsidence assumed layer SL at the multiple setting positions BP. Note that this management is performed by, for example, a computer.

[0017] The second step SA2 of estimating the amount of subsidence shown in FIG. 2 is a step of constructing a virtual ground model VG including a plurality of subsidence expected layers SL. FIG. 5 is a schematic diagram of the virtual ground model VG in this embodiment. That is, first, the lower end points BPb of each of the plurality of subsidence assumed layers SL at the plurality of setting positions BP are interpolated to generate a virtual lower surface SLb of each of the plurality of subsidence assumed layers SL, and at the same time, the upper end points BPt of each of the plurality of subsidence assumed layers SL at the plurality of setting positions BP are interpolated to generate a virtual upper surface SLt of each of the plurality of subsidence assumed layers SL. As a result, a virtual ground model VG is constructed for the ground G at the site where the building is to be constructed, as shown in FIG. In other words, the interpolation between points may be performed based on the positions of the upper end point BPt and the lower end point BPb of the assumed subsidence layer SL at the set position BP obtained by boring survey. In this embodiment, the interpolation between points is preferably a curved surface interpolation in which the areas between the points are curved surfaces. The curved surface interpolation is performed using, for example, a known three-dimensional modeling tool. Note that the virtual ground model VG may be constructed by a computer.

[0018] In this embodiment, there are three subsidence assumed layers. Therefore, three imaginary lower surfaces SLb are generated: a first imaginary lower surface SLb1 of the first subsidence assumed layer D1, a second imaginary lower surface SLb2 of the second subsidence assumed layer D2, and a third imaginary lower surface SLb3 of the third subsidence assumed layer D3. Furthermore, three imaginary upper surfaces SLt are generated: a first imaginary upper surface SLt1 of the first subsidence assumed layer D1, a second imaginary upper surface SLt2 of the second subsidence assumed layer D2, and a third imaginary upper surface SLt3 of the third subsidence assumed layer D3.

[0019] In this way, even if multiple subsidence expected layers SL are included, a virtual ground model VG showing the three-dimensional positional relationship of the multiple subsidence expected layers underground can be constructed by generating a virtual upper surface SLt and a virtual lower surface SLb for each of the multiple subsidence expected layers.

[0020] In the example shown in Figure 5, only the imaginary upper surface SLt and imaginary lower surface SLb of each of the multiple subsidence assumed layers SL underground are displayed, but support layers SH exist between the ground surface and the upper end surface SLt1 of the first subsidence assumed layer D1, between the imaginary lower surface SLb1 of the first subsidence assumed layer D1 and the upper end surface SLt2 of the second subsidence assumed layer D2, and between the imaginary lower surface SLb2 of the second subsidence assumed layer D2 and the upper end surface SLt3 of the third subsidence assumed layer D3.

[0021] The third step SA3 of estimating the amount of subsidence shown in Fig. 2 is a step of calculating the expected amount of subsidence at multiple assumed pile driving positions PP from the virtual ground model VG constructed in the second step SA2. In this embodiment, the predicted expected amount of subsidence is the amount of subsidence due to consolidation settlement.

[0022] First, the positions where multiple piles P will be driven in the building, i.e., multiple expected pile driving positions PP, are set. Next, the positions of multiple expected subsidence layers SL at the expected pile driving positions PP are identified in the virtual ground model VG of the site where the building will be constructed. Then, for example, the expected subsidence of pile P at each of the multiple expected pile driving positions PP is calculated using the one-dimensional settlement calculation method described on page 44 of the "Guidelines for Architectural Foundation Structure Design (Architectural Institute of Japan, 3rd Edition, published November 2019)." The expected amount of settlement can be calculated as the amount of consolidation settlement S (m) by the compression curve method (e~logσ method) of the following equation 1.

[0023]

number

[0024] Here, Δe i is the vertical effective stress increment Δσ at the center of the i layer due to embankment and building construction, etc. z ´(kN / m 2 ) is the change in void ratio caused by In addition, Δe i is the value read from the e~logσ curve. Also, e 0i is the vertical effective stress σ at the center of the i layer before construction 1zi ´ is the void ratio. H i is the thickness of layer i (m).

[0025] In this embodiment, a one-dimensional subsidence calculation formula is used to estimate the subsidence of the multiple subsidence expected layers SL. For example, a method using FEM (Finite Element Method) analysis is known as a method for estimating the amount of ground subsidence. Since FEM analysis requires two-dimensional or three-dimensional calculations, it takes a relatively long time (for example, about two weeks) to obtain calculation results. In contrast, with one-dimensional subsidence calculations such as those in this embodiment, it takes a relatively short time (for example, about half a day to one day) to obtain calculation results. In addition, since the FEM analysis estimates the amount of subsidence based on the weakest part of each assumed subsidence layer SL, the calculation of the amount of subsidence is limited to a certain part. In contrast, the one-dimensional calculation of the amount of subsidence as in this embodiment can accurately calculate the amount of subsidence at all assumed pile driving positions PP.

[0026] In this embodiment, some of the plurality of set positions BP coincide with the plurality of assumed stake-out positions PP, or some of the plurality of assumed stake-out positions PP coincide with the plurality of set positions BP. In other words, part or all of the pile P may be driven into the ground G at a set position BP where the lower end point BPb and the upper end point BPt of the assumed subsidence layer SL are specified. It is preferable that at least some of the multiple set positions BP coincide with the multiple assumed pile driving positions PP. This allows the expected amount of subsidence of the pile P driven into the set position BP to be calculated based on the results of an actual boring survey, improving the accuracy of the estimation. The deformation angle expected for the foundation beam B may be calculated from the expected settlement amount. The calculation of the deformation angle may be performed by a computer.

[0027] In this embodiment, some of the plurality of set positions BP may not coincide with the plurality of assumed stake-out positions PP, or some of the plurality of assumed stake-out positions PP may not coincide with the plurality of set positions BP. From the viewpoint of expenses and work costs, it is often difficult to conduct boring surveys at all the locations where piles will be driven (proposed pile driving positions PP). Therefore, as shown in Figure 1, the number of proposed pile driving positions PP may be greater than the number of set positions BP where boring surveys will be performed. As described above, by constructing a virtual ground model VG based on the results of a boring survey at the set position BP, it is possible to accurately estimate the positions of multiple expected subsidence layers SL even at the expected pile driving position PP where the position of the expected subsidence layer SL has not actually been surveyed (at a position different from the set position BP), and it is also possible to accurately estimate the expected amount of subsidence.

[0028] The degree of weakness of the ground in each subsidence assumed layer SL differs depending on the layer. Therefore, the estimated subsidence amount for each of the multiple subsidence assumed layers SL is calculated for the first subsidence assumed layer D1, the second subsidence assumed layer D2, and the third subsidence assumed layer D3. The estimated subsidence amount for the first subsidence assumed layer D1 is referred to as the first estimated subsidence amount, the estimated subsidence amount for the second subsidence assumed layer D2 is referred to as the second estimated subsidence amount, and the estimated subsidence amount for the third subsidence assumed layer D3 is referred to as the third estimated subsidence amount. The estimated subsidence amount (total estimated subsidence amount) at the assumed pile driving position PP is calculated by adding up the estimated subsidence amounts of the multiple subsidence assumed layers SL that satisfy the following conditions:

[0029] When driving a pile, if the bottom end of the pile is in the area of ​​the subsidence expected layer SL, the subsidence expected layer SL cannot support the bottom end of the pile, and there is a risk that the pile will sink within the subsidence expected layer SL. Therefore, it is preferable to drive the pile so that the bottom end of the pile is located in one of the areas of the support layer SH. Hereinafter, the support layer SH including the bottom end of the pile will be referred to as the pile support layer SHp.

[0030] When the bottom end of a driven pile is in the area of ​​the pile-bearing layer SHp, consolidation settlement of the subsidence-expected layer SL in the stratum below the pile-bearing layer SHp causes the pile to settle. That is, as shown in Figures 3 and 5, there are three subsidence-expected layers SL in the depth range surveyed by boring in this embodiment, but the number of subsidence-expected layers SL that affects the estimation of the amount of settlement varies depending on which of the bearing layer SH the bottom end of the pile is in.

[0031] For example, in this embodiment, among the supporting layers SH shown in Fig. 3, the supporting layer SH2 between the first subsidence assumed layer D1 and the second subsidence assumed layer D2 is the pile supporting layer SHp. Therefore, in this embodiment, the subsidence assumed layers SL that affect the estimation of the amount of subsidence are the second subsidence assumed layer D2 and the third subsidence assumed layer D3 that are located below the pile supporting layer SHp (the bottom end of the pile).

[0032] Therefore, in this embodiment, the first assumed subsidence amount is not used to calculate the total assumed subsidence amount at the assumed pile driving position PP. The total assumed subsidence amount at the assumed pile driving position PP in this embodiment is the sum of the second assumed subsidence amount of the second assumed subsidence layer D2 in the stratum below the pile-bearing layer SHp and the third assumed subsidence amount of the third assumed subsidence layer D3.

[0033] (Building reinforcement method) Next, a building reinforcement method according to this embodiment will be described. As shown in Fig. 1, the building reinforcement method according to this embodiment is a method for reinforcing foundation beams B, which are installed to connect multiple driven piles P in a building. The foundation beams B are reinforced, for example, by changing the cross-sectional shape of the foundation beams B to improve the moment of inertia, or by placing reinforcing steel bars around the foundation beams B. In the building reinforcement method according to this embodiment, whether or not to reinforce the foundation beams B of the building is determined by the following steps. FIG. 6 is a flowchart of the building reinforcing method according to this embodiment. That is, the building reinforcing method according to this embodiment includes the following first to third steps.

[0034] The first step SB1 of building reinforcement is a step of calculating an estimated subsidence difference value from the estimated subsidence amounts at a plurality of estimated pile driving positions PP. The expected subsidence difference value is the difference in the expected subsidence amount between adjacent piles P among multiple piles P driven into a building. In this embodiment, the expected subsidence difference value is calculated for each combination of piles P connected by a foundation beam B. In the first step SB1 of the building reinforcement, the expected amount of subsidence is estimated by the above-mentioned method of estimating the amount of subsidence. Note that the first step SB1 of the building reinforcement may be performed by, for example, a computer.

[0035] The second step SB2 of building reinforcement is a step of calculating the additional stress generated in the foundation beam B from the expected settlement difference value. The additional stress on the foundation beam B is a stress caused by a force applied to deform the foundation beam B due to the relative displacement of the positions of both ends of the foundation beam B caused by the different amounts of settlement of the piles P connected by the foundation beam B. In this embodiment, the additional stress of the foundation beams B is calculated for some or all of the foundation beams B provided in the building. Note that the second step SB2 of building reinforcement may be performed by a computer, for example.

[0036] The third step SB3 of building reinforcement is a step for determining the placement of reinforcing steel bars according to the applied stress. For example, if the applied stress of foundation beam B calculated in the second step SB2 is within the allowable range, there is no need to place reinforcing steel bars. If the applied stress of foundation beam B calculated in the second step SB2 exceeds the allowable range, the density of the reinforcing steel bars is calculated according to the magnitude of the applied stress, and then the placement of reinforcing steel bars around foundation beam B is considered. If the additional stress on the foundation beam B is large and the foundation beam B cannot be sufficiently reinforced by reinforcing steel bars, the second moment of area of ​​the foundation beam B may be improved by changing the shape of the foundation beam B. The third step SB3 of building reinforcement may be performed by a computer, for example.

[0037] (Display control device) Next, a description will be given of the display control device 100 according to this embodiment. The display control device 100 performs calculations in the subsidence amount estimation method and building reinforcement method described above, and also visually displays various information to the user. FIG. 7A is a block diagram of a display control device 100 according to this embodiment. The display control device 100 according to this embodiment includes a processor 10 such as a CPU (Central Processing Unit) and a memory 20 connected by a bus as a control unit 110, and executes a program. The display control device 100 displays various types of information on a display unit 30 by executing the program. The display unit 30 includes a display device such as a CRT (Cathode Ray Tube) display, a liquid crystal display, or an organic EL (Electro-Luminescence) display. Note that, although the display unit 30 shown in FIG. 7A is provided inside the display control device 100, the present disclosure is not limited to this, and the display unit 30 may be provided outside the display control device 100.

[0038] FIG. 7B is a block diagram of the control unit 110 in the display control device 100 according to this embodiment. The control unit 110 of this embodiment includes an end point specifying unit 111 , a ground model constructing unit 112 , an expected subsidence amount display control unit 113 , an expected subsidence difference value calculating unit 114 , and a deformation angle calculating unit 115 . The display control device 100 includes an end point identification unit 111 that identifies the lower end point BPb and the upper end point BPt of each of multiple subsidence expected layers SL at multiple set positions BP as shown in Figure 3, a ground model construction unit 112 that constructs a virtual ground model VG including multiple subsidence expected layers SL as shown in Figure 5, and an estimated subsidence amount display control unit 113 that displays the estimated subsidence amount of each of the multiple subsidence expected layers SL at multiple expected pile driving positions PP from the virtual ground model VG on the display unit 30. In the display control device 100, the virtual ground model VG may be constructed by interpolating between the identified lower endpoints BPb to generate a virtual lower surface SLb of each of the multiple subsidence expected layers SL, and by complementing between the identified upper endpoints BPt to generate a virtual upper surface SLt of each of the multiple subsidence expected layers SL. The estimated subsidence difference value calculation unit 114 in the display control device 100 may calculate the estimated subsidence difference value from the estimated subsidence amounts at the plurality of estimated pile driving positions PP. Furthermore, the deformation angle calculation unit 115 in the display control device 100 may calculate the deformation angle of the foundation beam B from the calculated subsidence difference value.

[0039] FIG. 8 shows a first example of information displayed by the display unit 30 in this embodiment. In this embodiment, the display control device 100 displays the layout relationship of a plurality of subsidence assumed layers SL, for example, as shown in FIG. That is, for example, as shown in FIG. 8, the display unit 30 may display the vertical positional relationship of the ground surface and a plurality of subsidence assumed layers SL as a diagram.

[0040] FIG. 9 shows a second example of information displayed by the display unit 30 in this embodiment. In this embodiment, the display control device 100 may display the estimated subsidence amount by setting the shade of color according to the magnitude of the value of the estimated subsidence amount. That is, for example, as shown in FIG. 9, the display unit 30 may display the estimated subsidence amounts of a plurality of piles P as a table. At this time, the shade of the color may be set depending on the magnitude of the estimated subsidence amount, for example, a relatively small estimated subsidence amount may be displayed in a light color, and a relatively large estimated subsidence amount may be displayed in a dark color. This allows the user to visually and intuitively grasp the magnitude or difference in magnitude of the expected subsidence amounts of multiple piles P.

[0041] Note that when the user selects an image of a subsidence estimated layer SL from among the multiple subsidence estimated layers SL shown in Fig. 8, a table such as that shown in Fig. 9 may be displayed as details of the selected subsidence estimated layer SL. Specifically, for example, when the user wishes to check the estimated amount of subsidence of the first subsidence estimated layer D1, the user selects the image of the first subsidence estimated layer in the information shown in Fig. 9. As a result, a table such as that shown in Fig. 9 may be displayed, showing the estimated amount of subsidence of the selected first subsidence estimated layer D1.

[0042] Furthermore, the display control device 100 may display the virtual ground model VG constructed by the ground model construction unit 112 on the display unit 30. This allows the user to visually grasp the state of underground strata that are normally invisible to the naked eye through the virtual ground model VG.

[0043] FIG. 10 shows a third example of information displayed by the display unit 30 in this embodiment. In this embodiment, the display control device 100 may display the deformation angle of the foundation beam B in association with the estimated settlement amount of each of the plurality of piles P. That is, for example, as shown in FIG. 10, the display unit 30 may display the deformation angles of a plurality of foundation beams B in a table. At this time, the shade of color may be set depending on the magnitude of the deformation angle of the foundation beam B, for example, a relatively small deformation angle may be displayed in a light color, and a relatively large deformation angle may be displayed in a dark color. This allows the user to intuitively grasp the magnitude of the deformation angle of the foundation beam B visually.

[0044] As described above, according to the subsidence amount estimation method of this embodiment, first, the bottom end point BPb and the top end point BPt of each of the plurality of subsidence assumed layers SL at the plurality of set positions BP are identified. Next, a virtual ground model VG including a plurality of subsidence assumed layers SL is constructed based on information on the lower end points BPb and upper end points BPt of each of the plurality of subsidence assumed layers SL at the specified plurality of set positions BP. Then, the expected subsidence amounts (total expected subsidence amounts) at the plurality of expected pile driving positions PP are calculated from the virtual ground model VG. In this way, by constructing a virtual ground model VG in advance based on the lower end point BPb and the upper end point BPt of each of the multiple assumed subsidence layers SL at the multiple set positions BP, it is possible to accurately estimate the three-dimensional positions of the multiple assumed subsidence layers SL at positions other than the set positions BP. Therefore, by constructing the virtual ground model VG and then calculating the assumed amount of subsidence of the pile P, it is possible to accurately calculate the assumed amount of subsidence of the ground including the multiple assumed subsidence layers SL not only at the assumed pile-driving positions PP that coincide with the set positions BP, but also at the assumed pile-driving positions PP that do not coincide with the set positions BP. Therefore, it is possible to prevent unexpected settlement of the pile P that may occur when the amount of settlement is estimated only at a representative position in the ground G. In addition, it becomes easier to design a structure that allows for the settlement of the piles P, which reduces design costs and also reduces the increase in costs that would be incurred by increasing the number of piles P in a design that does not allow for settlement. Therefore, the amount of subsidence can be estimated accurately regardless of the number of layers where subsidence is expected, and costs can be reduced.

[0045] According to another example of the subsidence amount estimation method according to the present embodiment, first, the bottom end point BPb and the top end point BPt of each of the plurality of subsidence assumed layers SL at the plurality of set positions BP are identified. Next, a virtual lower surface SLb of the subsidence expected layer SL is generated by interpolating between the lower end points BPb of the subsidence expected layer SL at the multiple set positions BP, and a virtual upper surface SLt of each of the multiple subsidence expected layers SL is generated by interpolating between the upper end points BPt of each of the multiple subsidence expected layers SL at the multiple set positions BP, thereby constructing a virtual ground model VG including multiple subsidence expected layers SL. Then, the expected subsidence amounts at multiple expected pile driving positions PP are calculated from the virtual ground model VG. In this way, by generating the virtual bottom surface SLb and the virtual top surface SLt of each of the multiple subsidence assumed layers SL, a highly accurate virtual ground model VG including multiple subsidence assumed layers SL can be constructed. Then, by calculating the expected subsidence of the pile P, the expected subsidence at the pile driving assumed position PP can be calculated more accurately. Therefore, it is possible to more reliably prevent unexpected settlement of the pile P that may occur when the amount of settlement is estimated only at a representative position in the ground G. In addition, it becomes easier to design a structure that allows for the settlement of the piles P, thereby reducing design costs and preventing cost increases that would otherwise occur if the number of piles P were increased in a design that does not allow for settlement. Therefore, the amount of subsidence can be estimated accurately regardless of the number of layers where subsidence is expected, and costs can be reduced.

[0046] In addition, some of the plurality of set positions BP may coincide with the plurality of assumed stake-out positions PP, or some of the plurality of assumed stake-out positions PP may coincide with the plurality of set positions BP. In other words, some or all of the piles P are driven into the ground G at set positions BP where the lower end point BPb and the upper end point BPt of each of the plurality of assumed subsidence layers SL are specified. This allows the expected amount of settlement of the pile P driven into the set position BP to be calculated with greater accuracy. Therefore, the amount of subsidence can be estimated accurately regardless of the number of layers where subsidence is expected, and costs can be reduced.

[0047] Furthermore, some of the plurality of set positions BP may not coincide with the plurality of assumed stake-out positions PP, or some of the plurality of assumed stake-out positions PP may not coincide with the plurality of set positions BP. By constructing a virtual ground model VG based on the results of a boring survey at the set position BP, it is possible to accurately estimate the positions of multiple expected subsidence layers SL even at the expected pile driving position PP that has not actually been surveyed (at a position different from the set position BP), and it is also possible to accurately estimate the expected amount of subsidence. Therefore, even if some of the multiple set positions BP do not coincide with the multiple expected pile driving positions PP, the amount of subsidence can be accurately estimated regardless of the number of expected subsidence layers, and costs can be reduced.

[0048] Furthermore, the interpolation between the lower end points BPb or the upper end points BPt of the plurality of assumed subsidence layers SL at the plurality of set positions BP is preferably a curved surface interpolation in which the curved surfaces are formed between the points. This allows the virtual lower surface SLb and the virtual upper surface SLt of each of the plurality of assumed subsidence layers SL to be generated more accurately, and a more accurate virtual ground model VG to be constructed. Therefore, the expected subsidence amount of the pile P at the expected pile driving position PP can be calculated more accurately.

[0049] Note that the surface in the surface interpolation can be generated by, for example, the Patch command of Grasshopper (Aplicraft Co., Ltd.). The Patch command creates an approximate patch surface from input curves and points. You can also adjust the accuracy of the surface by adjusting the Spans and Flexibility. In this embodiment, multiple lower end points BPb and multiple upper end points BPt of each expected subsidence layer SL are input as a point group (Points), and the softness of the curved surface is adjusted by the spacing (Spans) and elasticity (Flexibility). By adjusting the softness of the surface, the shape of the surface can be adjusted so that it passes through each of the input points.

[0050] The plurality of subsidence expected layers SL are also expected to include at least one of a clay layer and a silt layer. This makes it possible to calculate the expected amount of subsidence of the pile P due to the clay or silt layer at the expected pile driving position PP.

[0051] In addition, the lower end point BPb and the upper end point BPt of each of the plurality of assumed subsidence layers SL at the plurality of set positions BP may be specified based on the boring log Bc. In this way, by repurposing the existing boring log Bc to identify the subsidence-prone layer SL, the lower end point BPb and upper end point BPt of the subsidence-prone layer SL can be identified without performing any special work. Therefore, it is possible to prevent an increase in costs due to investigations of the ground G, etc.

[0052] In addition, at the plurality of set positions BP, the vertical length Z of each assumed subsidence layer SL may be divided into a plurality of reference lengths X and one fractional length Y that is shorter than the reference length X. In this way, by using the reference length, it is possible to easily compare the vertical lengths Z of each assumed subsidence layer SL between a plurality of set positions BP.

[0053] Moreover, according to the building reinforcement method of this embodiment, first, a relative settlement difference value is calculated from the estimated settlement amounts at a plurality of estimated pile driving positions PP. Next, the additional stress generated in the foundation beam B is calculated from the expected differential settlement values ​​at multiple expected pile driving positions PP. Then, the placement of reinforcing steel bars is determined according to the added stress. In other words, the density and number of reinforcing bars are determined based on the additional stress of the foundation beam B estimated from the estimated settlement at multiple estimated pile driving positions PP. This makes it easier for the foundation beam B to resist additional stress caused by the settlement of multiple piles P. In addition, by reinforcing the foundation beam B more accurately, it is possible to prevent increases in costs due to excessive reinforcement of the building.

[0054] The estimated amount of settlement of the pile P may be estimated by the method for estimating the amount of settlement according to any one of the above aspects. In other words, the arrangement of the reinforcing steel bars, such as the density and number of bars, is determined according to the additional stress of the foundation beam B calculated from the amount of settlement of the pile P estimated by one of the methods described above. This allows the additional stress generated in the foundation beam B to be accurately grasped, and the foundation beam B to be reinforced appropriately. Therefore, the foundation beam B can be made more resistant to additional stress caused by the settlement of multiple piles P.

[0055] In addition, the display control device 100 of this embodiment is equipped with an end point identification unit 111 that identifies the lower end point BPb and the upper end point BPt of each of the multiple subsidence expected layers SL at the multiple set positions BP, a ground model construction unit 112 that constructs a virtual ground model VG that includes the multiple subsidence expected layers SL, and an expected subsidence amount display control unit 113 that displays the expected subsidence amount of each of the multiple subsidence expected layers SL at the multiple expected pile driving positions PP from the virtual ground model VG on the display unit 30. In this way, the display control device 100 can construct a virtual ground model VG in the ground model construction unit 112. Also, from the virtual ground model VG, it is possible to estimate the estimated amount of subsidence of each of the multiple subsidence estimated layers SL at the multiple assumed pile driving positions PP. Furthermore, it is possible to display the estimated amount of subsidence of each of the subsidence estimated layers SL on the display unit. With the above configuration, the virtual ground model VG can accurately estimate the arrangement of multiple subsidence assumed layers SL at locations other than the set position BP. Therefore, the estimated subsidence amount of each of the multiple subsidence assumed layers SL at the multiple assumed pile driving positions PP can be accurately estimated, and the estimated subsidence amount at the assumed pile driving positions PP can be accurately estimated. Therefore, the amount of subsidence can be accurately estimated regardless of the number of assumed subsidence layers. Furthermore, by displaying the estimated subsidence amount of each of the assumed subsidence layers SL on the display unit, the user can grasp the estimated subsidence amount of each of the assumed subsidence layers SL.

[0056] The display control device 100 also includes an end point identification unit 111 that identifies the lower end point BPb and the upper end point BPt of each of the multiple subsidence expected layers SL at the multiple set positions BP, a ground model construction unit 112 that constructs a virtual ground model VG including the multiple subsidence expected layers SL by interpolating between the lower end points BPb of each of the multiple subsidence expected layers SL at the multiple set positions BP and generating a virtual upper surface SLt of each of the multiple subsidence expected layers SL by interpolating between the upper end points BPt of each of the multiple subsidence expected layers SL at the multiple set positions BP, and an estimated subsidence amount display control unit 113 that displays the estimated subsidence amount of each of the multiple subsidence expected layers SL at the multiple expected pile driving positions PP from the virtual ground model VG on the display unit 30. With this configuration, the ground model construction unit 112 generates a virtual bottom surface SLb and a virtual top surface SLt for each of the multiple assumed subsidence layers, thereby enabling the construction of a more accurate virtual ground model VG. Therefore, the assumed amount of subsidence for each of the multiple assumed subsidence layers SL at the multiple assumed pile driving positions PP can be accurately estimated, and the assumed amount of subsidence at the assumed pile driving positions PP can be accurately estimated. Therefore, the amount of subsidence can be accurately estimated regardless of the number of assumed subsidence layers. Furthermore, by displaying the assumed amount of subsidence for each of the assumed subsidence layers SL on the display unit, the user can grasp the assumed amount of subsidence for each of the assumed subsidence layers SL.

[0057] Furthermore, the display control device 100 may set the color density according to the estimated amount of subsidence of the pile P and cause the display unit 30 to display the color density. This makes it easier for the user to intuitively grasp the expected amount of settlement of the pile P visually.

[0058] Furthermore, the display control device 100 may display the deformation angle of the foundation beam B in association with the estimated settlement amount of the pile P. This makes it easier for the user to understand whether the deformation angle expected for the foundation beam B is within the allowable range.

[0059] In addition, the system may further include an estimated subsidence differential value calculation unit 114 that calculates an estimated subsidence differential value from the estimated subsidence amounts at multiple estimated pile driving positions PP, and a deformation angle calculation unit 115 that calculates the deformation angle of the foundation beam from the estimated subsidence differential value, and the estimated subsidence amount display control unit 113 may display the deformation angle in association with the estimated subsidence amount. With this configuration, the user can easily understand the correspondence relationship between the expected subsidence amount and the deformation angle.

[0060] The technical scope of the present disclosure is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the present disclosure. For example, although it has been explained that the display unit 30 sets the shade of color according to the estimated amount of settlement of the pile P and the deformation angle of the foundation beam B, it is also possible to set the brightness of the color. That is, for example, if the estimated amount of settlement or the deformation angle of the foundation beam B is a relatively large value, it is displayed in a bright color, and if the estimated amount of settlement or the deformation angle of the foundation beam B is a relatively small value, it is displayed in a dark color. Alternatively, the color itself may be changed for display. For example, if the estimated amount of settlement or the deformation angle of the foundation beam B is a relatively large value, it is displayed in red, and if the estimated amount of settlement or the deformation angle of the foundation beam B is a relatively small value, it is displayed in blue. Also, for example, a virtual ground model VG may be displayed on the display unit 30, and the numerical values ​​of the estimated subsidence of each pile P and the deformation angle of the foundation beam B may be displayed in the areas corresponding to the positions where multiple piles P and foundation beams B are to be installed.

[0061] In addition, within the scope of the present disclosure, the components in the above-described embodiments may be replaced with well-known components as appropriate, and the above-described modified examples may be combined as appropriate. [Explanation of symbols]

[0062] 10 processors 20 memory 30 Display section 100 Display control device 110 control section 111 End point identification part 112 Ground Model Construction Section 113 Estimated subsidence amount display control unit 114 Expected settlement difference value calculation section 115 Deformation angle calculation section B Foundation beam Bc boring log BP setting position BP1 1st setting position BP2 2nd setting position BP3 Third setting position BP4 4th setting position BP5 5th setting position BP6 6th setting position BPb lower end point BPt upper end point G Ground P pile PP expected position SL expected subsidence layer D1 First expected subsidence layer D2 Second expected subsidence layer D3 Third expected subsidence layer SLb virtual bottom surface SLt Virtual top surface VG Virtual Ground Model X standard length Y fraction length Z: Vertical length of the assumed subsidence layer

Claims

1. A method for estimating settlement amount at the design stage of a building, comprising: Identifying a lower end point and an upper end point of each of a plurality of assumed subsidence layers within the ground at each of a plurality of set positions; generating a virtual lower surface of each of the plurality of assumed subsidence layers by interpolating between the lower end points of each of the plurality of assumed subsidence layers at the plurality of set positions, and generating a virtual upper surface of each of the plurality of assumed subsidence layers by interpolating between the upper end points of each of the plurality of assumed subsidence layers at the plurality of set positions, and constructing a virtual ground model including the plurality of assumed subsidence layers formed by the virtual lower surface and the virtual upper surface; calculating an estimated subsidence amount of the pile corresponding to the consolidation subsidence amount in each of the plurality of estimated subsidence layers at the plurality of estimated pile driving positions from the virtual ground model by calculating the sum of the estimated subsidence amounts of the estimated subsidence amounts of the estimated subsidence layers in the stratum below the bottom end of the pile, among the estimated subsidence amounts in each of the plurality of estimated subsidence layers at the plurality of estimated pile driving positions; A method for estimating subsidence, including:

2. Some of the plurality of set positions coincide with the plurality of assumed stake driving positions, Alternatively, some of the plurality of assumed stake driving positions coincide with the plurality of set positions. The method for estimating the amount of subsidence according to claim 1.

3. Some of the plurality of set positions do not coincide with the plurality of assumed stake driving positions, Or, some of the plurality of assumed stake driving positions do not coincide with the plurality of set positions, The method for estimating the amount of subsidence according to claim 1.

4. The interpolation between the points is a curved surface interpolation in which the curved surfaces are formed between the points. The method for estimating the amount of subsidence according to claim 1.

5. The plurality of subsidence assumed layers include at least one of a clay layer and a silt layer, The method for estimating the amount of subsidence according to claim 1.

6. The lower end point and the upper end point of each of the plurality of assumed subsidence layers at the plurality of set positions are identified based on a boring log. The method for estimating the amount of subsidence according to claim 1.

7. The vertical length of each of the plurality of assumed subsidence layers is divided into a plurality of reference lengths and one fractional length that is shorter than the reference length. The method for estimating the amount of subsidence according to claim 1.

8. A building reinforcement method, comprising reinforcing a building based on an estimated amount of subsidence estimated by the method for estimating amount of subsidence according to any one of claims 1 to 7.

9. an end point specifying unit that specifies a lower end point and an upper end point of each of a plurality of assumed subsidence layers in the ground at each of a plurality of set positions; a ground model construction unit that generates a virtual lower surface of each of the plurality of assumed subsidence layers by interpolating between the lower end points of each of the plurality of assumed subsidence layers at the plurality of set positions, and generates a virtual upper surface of each of the plurality of assumed subsidence layers by interpolating between the upper end points of each of the plurality of assumed subsidence layers at the plurality of set positions, and constructs a virtual ground model including the plurality of assumed subsidence layers formed by the virtual lower surface and the virtual upper surface; an estimated subsidence amount display control unit that calculates, from the virtual ground model, the amount of consolidation settlement in each of the plurality of assumed subsidence layers at a plurality of assumed pile driving positions by calculating the sum of the estimated subsidence amounts of the assumed subsidence layers in the stratum below the bottom end of the piles among the estimated subsidence amounts in each of the plurality of assumed subsidence layers at the plurality of assumed pile driving positions, and displays the estimated subsidence amount of the pile corresponding to the amount of consolidation settlement on a display unit; Display control device.

10. the estimated subsidence amount display control unit sets and displays a color shade according to the estimated subsidence amount; The display control device according to claim 9 .

11. an estimated subsidence difference value calculation unit that calculates an estimated subsidence difference value from the estimated subsidence amounts at the plurality of estimated pile driving positions; and a deformation angle calculation unit that calculates the deformation angle of the foundation beam from the estimated settlement difference value. the estimated subsidence amount display control unit displays the estimated subsidence amount in association with the deformation angle, The display control device according to claim 9 .

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