Foundation structure, foundation structure design method, program, and single-story building

Abstract

To provide a systemized foundation structure in which pillars can be installed near the boundary line of an adjacent land. [Solution] A foundation structure 100 that supports a structural support 30, comprising an outer frame 10 with a curved surface formed from thin steel plates, and concrete 20 that is filled inside the outer frame 10 and integrated with the outer frame 10, and the structural support 30 is fixed at a position eccentric to the center of the outer frame 10.

Description

[Technical field]

[0001] The present invention relates to a foundation structure, a foundation structure design method, a program, and a single-story building. [Background technology]

[0002] When installing columns in the construction of a structure such as a building, a foundation structure is installed on the ground and the foundation structure and the columns are fixed with anchor bolts. For example, a structure in which concrete is poured inside a cylindrical outer frame formed of thin steel plates has been disclosed (for example, Patent Document 1). Also, a structure has been disclosed that includes at least one restraining member that connects two of the edges of a formwork formed from thin steel plates (for example, Patent Document 2). The conventional foundation structure is systemized. In other words, it is constructed according to a size and structure that are standardized in advance. This avoids designing each construction site individually, and offers benefits such as reducing the number of construction steps, shortening the process, and reducing costs. In addition, the fixed position of the pillars for the conventional foundation structure is the center of the foundation structure. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2005-68951 A [Patent Document 2] JP 2020-20218 A Summary of the Invention [Problem to be solved by the invention]

[0004] In the conventional foundation structure, the position of the pillar needs to be in the center of the foundation structure. Therefore, if the position where the pillar of the structure is fixed is close to the boundary line of the neighboring property, the foundation structure may interfere with the neighboring property if the position of the pillar is prioritized. In this case, the foundation structure cannot actually interfere with the neighboring property, and in order to avoid this interference, it is necessary to design the foundation structure individually, rather than designing it based on a systemized (standardized) foundation structure. Therefore, there was a problem that the above-mentioned systemized foundation structure could not be used, and benefits such as reduction in the number of works, shortening of the process, and cost reduction could not be enjoyed.

[0005] The present invention has been made in consideration of the above-mentioned circumstances, and aims to provide a systemized foundation structure in which pillars can be installed at locations close to the boundary line of adjacent properties by making the pillars eccentric from the central position. [Means for solving the problem]

[0006] In order to solve the above problems, the present invention proposes the following means. The foundation structure of the present invention is a foundation structure that supports a structural column, and is characterized in that it comprises a curved outer frame formed from thin steel plates, and concrete that is filled inside the outer frame and integrated with the outer frame, and the structural column is fixed at a position eccentric to the center of the outer frame.

[0007] According to this invention, the structure support is fixed at a position eccentric to the center of the outer frame. As a result, when the position of the structure support is close to the boundary line of the neighboring property, the position of the structure support is eccentric without changing the position of the outer frame, so that only the structure support can be installed close to the boundary line of the neighboring property. This makes it possible to create a foundation structure in which the pillars can be installed at positions closer to the boundary line of the neighboring property.

[0008] The present invention may also be characterized in that multiple reinforcing bars are arranged at equal intervals inside the concrete, and the position of the structural support is eccentric from the center of the outer frame along the extension direction of the reinforcing bars by an integer multiple of the interval at which the reinforcing bars are arranged.

[0009] According to this invention, the position of the structural support is eccentric from the center of the outer frame along the extension direction of the reinforcing bars by an integer multiple of the interval at which the reinforcing bars are arranged. In this way, by gradually adjusting the eccentricity of the structural support, the amount of eccentricity can be efficiently considered in the design study of the structure. In addition, when the structural support is eccentric, it is possible to prevent interference between the anchor bolts that fasten the structural support to the foundation structure and the reinforcing bars.

[0010] The outer frame may also be cylindrical.

[0011] According to this invention, the outer frame is cylindrical. In other words, the foundation structure is cylindrical. This makes it possible to prevent stress concentration from occurring in the foundation structure when a load is applied to the structural support columns provided on the foundation structure. This can contribute to the durability of the foundation structure. Furthermore, making the outer frame cylindrical makes it easier to manufacture the foundation structure. This can contribute to shortening the process.

[0012] Furthermore, the design method for a foundation structure according to the present invention is a design method for determining an amount of eccentricity of a structural column from the center of the outer frame in the foundation structure, and is characterized in including a determination step for determining the amount of eccentricity, and a judgment step for judging whether the amount of eccentricity determined in the determination step satisfies predetermined design conditions.

[0013] According to this invention, after the amount of eccentricity of the structural support column is determined in the determination step, it is judged whether or not the design conditions are satisfied in the judgment step. In other words, the amount of eccentricity of the structural support column is determined in advance, and only whether or not the design conditions are satisfied is examined. This makes it possible to reduce the time required for examination, compared to a method in which an optimal amount of eccentricity is calculated as an examination result that incorporates each condition. Therefore, design examination can be performed efficiently.

[0014] Furthermore, by determining the amount of eccentricity of the structure support columns, i.e., the positions of the structure support columns in the structure, in advance, the layout design of the structure can be performed in parallel with the consideration of the foundation structure. In other words, the layout design of the structure can be performed more efficiently and flexibly than when the layout design of the structure is performed after waiting for the calculation of the optimal amount of eccentricity.

[0015] The information used in the determination in the determining step may include a ground pressure.

[0016] According to this invention, the information used in the determination step includes ground pressure. Specifically, it is determined that the ground pressure does not exceed the bearing capacity of the ground. Here, the ground pressure refers to the load per unit area acting on the foundation structure. Using the ground pressure information to consider the eccentricity of the structure's support columns can contribute to ensuring the strength and durability of the structure.

[0017] The information used in the determination in the determining step may include a size of the basic structure.

[0018] According to the present invention, the information used in the determination step includes the size of the foundation structure. By using the information on the size of the foundation structure in examining the amount of eccentricity of the structure support column, it is possible to contribute to satisfying conditions regarding the layout of the structure.

[0019] The information used in the judgment in the judgment step may also include a thickness of the reinforcing bar.

[0020] According to this invention, the information used in the judgment step includes the thickness of the reinforcing bars. By using the information on the thickness of the reinforcing bars to consider the eccentricity of the structural support columns, it is possible to design while understanding the relationship between the amount of concrete and the amount of reinforcing bars inside the outer frame of the foundation structure. Therefore, it is possible to contribute to obtaining the best possible consideration results while balancing the size of the foundation structure, the necessary strength, the budget, etc. at the construction site.

[0021] The information used in the judgment in the judgment step may also include whether or not the reinforcing bar needs to be upsized.

[0022] According to this invention, the information used in the judgment step includes whether or not it is necessary to increase the size of the reinforcing bars. In other words, when considering the amount of eccentricity of the structural support columns, an increase in the size of the reinforcing bars provided in the foundation structure is taken into consideration. This allows the foundation structure to be provided without changing the size of the entire foundation structure when the design conditions can be satisfied only by increasing the size of the reinforcing bars provided inside the foundation structure. In other words, the foundation structure can be provided with the minimum necessary size. This contributes to making the layout of the structure easier. Furthermore, by minimizing the amount of concrete poured into the foundation structure, it contributes to improving cost efficiency.

[0023] The information used in the judgment in the judging step may also include a possible movement amount of the structural support column.

[0024] According to this invention, the information used in the determination step includes the possible movement amount of the structural support. In other words, the movement amount is considered within the possible range of the structural support in the foundation. This makes it possible to achieve both the necessary movement amount of the structural support in the foundation and the strength of the foundation.

[0025] Furthermore, the program according to the present invention causes a computer to function as a reviewing device for reviewing the design of a foundation structure using the above-mentioned design method for a foundation structure.

[0026] According to the present invention, the design and examination of the foundation structure according to the present invention is carried out by a program. Therefore, it is possible to minimize human errors that occur when inputting values, etc., and it is also possible to contribute to reducing labor costs.

[0027] Moreover, the one-story building according to the present invention is provided with the foundation structure.

[0028] According to the present invention, the foundation structure according to the present invention is applied to a single-story building, whereby the effects of the foundation structure according to the present invention can be enjoyed to the maximum extent. Effect of the Invention

[0029] According to the present invention, it is possible to provide a systemized foundation structure in which the pillar positions are offset from the center so that the entire foundation is contained within the boundary line of the neighboring property, and the pillars can be installed in locations close to the boundary line of the neighboring property. [Brief description of the drawings]

[0030] [Figure 1] 2 is a cross-sectional side view showing the foundation structure according to the embodiment. FIG. [Diagram 2] FIG. 2 is a plan view of the base structure shown in FIG. [Diagram 3] FIG. 2 is a diagram showing the positional relationship between the structural support columns and the reinforcing bars in a plan view of the foundation structure. [Figure 4] FIG. 1 is a first schematic diagram showing a state in which an axial force of a structural column is applied to a foundation structure. [Diagram 5] FIG. 2 is a second schematic diagram showing a state in which an axial force of a structural column is applied to a foundation structure. [Figure 6] This is an example showing a case where the diameter of the basic structure in FIG. 2 is increased. [Figure 7] FIG. 1 is a schematic diagram showing a state in which an external force is applied to a structure. [Figure 8] FIG. 8 is an enlarged view of a portion VIII in FIG. [Figure 9] FIG. 8 is an enlarged view of part IX in FIG. [Figure 10] 1 is a flowchart of a design method according to the present embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0031] Hereinafter, a base structure 100 according to an embodiment of the present invention will be described with reference to the drawings. As shown in FIG. 1, the foundation structure 100 includes an outer frame 10, concrete 20, reinforcing bars 40, anchor bolts 50, a base plate 60, and non-shrink mortar 70. The foundation structure 100 is used to support a structure such as a building. Specifically, the foundation structure 100 is used to hold a structure support 30 that is a part of the structure. Hereinafter, the foundation structure 100 and the structure support 30 may be collectively referred to as a foundation system. The foundation system according to this embodiment is particularly suitable for use when the distance between the structure support 30 and the neighboring land boundary line B in the structure is short. The foundation structure 100 according to this embodiment is particularly suitable for use in single-story buildings such as factories.

[0032] The outer frame 10 is located on the outer periphery of the foundation structure 100. The outer frame 10 is formed from a thin steel plate. Specifically, the outer frame 10 is formed by appropriately bending a strip-shaped thin steel plate so as to have a curved surface, and connecting the longitudinal ends of the strip. The outer frame 10 thus formed is preferably cylindrical. The size of the cylinder of the outer frame 10 formed from the thin steel plate is preferably an outer diameter of 1000 mm to 3800 mm, and a height of 500 mm to 1000 mm. The size is appropriately determined within the above-mentioned size range by a design method described later.

[0033] The concrete 20 is filled inside the outer frame 10 and integrated with the outer frame 10. In this way, the outer diameter of the foundation structure 100 is formed. The structure support 30 is placed in the concrete 20 filled inside the outer frame 10 as described above. As shown in Fig. 2, the structure support 30 is fixed at a position shifted (eccentric) from the center line C of the outer frame 10. As a result, when the position of the structure support 30 is close to the neighboring property boundary line B, only the structure support 30 is provided close to the neighboring property boundary line B without changing the position of the outer frame 10. The specific amount of eccentricity is appropriately determined by a design method described later.

[0034] The reinforcing bars 40 are rod-shaped members that reinforce the concrete 20 filled in the outer frame 10. A plurality of reinforcing bars 40 are disposed at equal intervals inside the concrete 20. It is preferable that the thickness of the reinforcing bars 40 is appropriately selected from those defined by standards. For example, reinforcing bars of D10 to D25 are preferably used.

[0035] As shown in Fig. 3, the reinforcing bars 40 are preferably arranged in a so-called lattice pattern in the concrete 20, intersecting a first direction D1 and a second direction D2 perpendicular to the first direction D1. The intervals (pitch) of the reinforcing bars 40 arranged in this manner are generally set to 100 mm, 150 mm, 200 mm, or 300 mm. Alternatively, in the case of a special foundation, a pitch other than the above may be used. Note that Fig. 3 shows a state in which the structural support 30 is located in the center of the foundation structure 100 (a reference example of this embodiment) for the sake of explanation later, but the arrangement position of the reinforcing bars 40 is the same as that of the reinforcing bars 40 of this embodiment.

[0036] The first direction D1 and the second direction D2 in which the reinforcing bars 40 are arranged are determined by the direction of the structure. In other words, they are not determined by the boundary line B. Therefore, the extension direction of the reinforcing bars 40 is determined by the boundary line B. parallel This may not be the case.

[0037] The base plate 60 is provided at the lower end of the structural support 30, and is a portion for fixing the structural support 30 to the concrete 20. As described above, the base plate 60 and the concrete 20 are fastened together by the anchor bolts 50. The non-shrink mortar 70 is poured between the base plate 60 and the concrete 20. The non-shrink mortar 70 has the property of not shrinking after hardening. The non-shrink mortar 70 is poured when fixing the base plate 60 and the concrete 20 with the anchor bolts 50 and the nuts N. This prevents a gap from occurring between the base plate 60 and the concrete 20 after the non-shrink mortar 70 has hardened, stabilizing the fixation.

[0038] (Design method of foundation structure 100) Next, a design method for the foundation structure 100 according to this embodiment will be described with reference to the flowchart in Fig. 10. That is, a design method for determining the amount of eccentricity of the structural support column 30 from the center line C of the foundation structure 100 will be described. The design method according to this embodiment includes a determination step and a judgment step.

[0039] (Decision step) The determining step is a step in which the designer determines the amount of eccentricity of the structural support 30 in the foundation 100 (first step S1). That is, the designer determines the position of the structural support 30 in the foundation 100 arranged on the structure in accordance with the conditions such as the position and layout of the structure to be constructed. At this time, the eccentric direction and amount of eccentricity of the structural support 30 are preferably arranged as follows, based on the state in which the structural support 30 is located at the center of the foundation 100 as shown in FIG. 3. That is, the eccentric direction of the structural support 30 is preferably along the extension direction of the reinforcing bars 40 provided inside the concrete 20, that is, the first direction D1 or the second direction D2. The amount of eccentricity of the structural support 30 is preferably determined in stages according to the pitch of the reinforcing bars 40 arranged inside the concrete 20. That is, it is preferable that the distance between the structural support 30 and the center line C of the foundation 100 is an integer multiple of the pitch of the reinforcing bars 40.

[0040] (Decision step) The determination step is a step in which the designer determines whether or not the eccentricity of the structural support 30 in the foundation structure 100 determined in the determination step satisfies predetermined design conditions. Examples of the design conditions include the following conditions (1) to (4). (1) Is the size of the foundation structure 100 a problem at the construction site of the structure? (2) Is there a problem with the thickness of the reinforcing bars 40 in the foundation structure 100 from the viewpoint of strength? (3) Can the strength of the foundation structure 100 be ensured by making the reinforcing bars 40 thicker? (4) Is there a problem with the eccentricity of the structural support 30 in the foundation structure 100? Below, the procedure for examining these design conditions will be explained with reference to the flowchart shown in FIG.

[0041] First, the ground pressure σ is calculated (second step S2) using the amount of eccentricity determined in the determination step (first step S1). The ground pressure σ is the load per unit area acting between the concrete 20 and the ground due to the axial force A of the structure support 30 loaded on the concrete 20. The axial force A is calculated taking into account the weight of the structure loaded on each of the structure support columns 30 arranged on the structure as well as external force F loaded due to strong winds and earthquakes (details will be described later). The ground pressure σ may be calculated by a designer or may be calculated by a calculator such as a computer.

[0042] As shown in FIG. 4, when the structural support 30 is located at an eccentric position from the center of the concrete 20 in the foundation 100, the contact pressure σ is maximum at the edge of the structural support 30 on the side eccentric from the center of the concrete 20. The contact pressure σ is minimum at the edge opposite to the side where the structural support 30 is eccentric from the center of the concrete 20. Using this rule, the contact pressure σ is obtained by integration from the relationship between the actual load of the minute area portion of the foundation 100 and the eccentricity of the structural support 30. In this way, the contact pressure σ between the concrete 20 and the ground is obtained as a bending moment diagram BMD as shown in FIG. 4 or FIG. 5. The bending moment diagram BMD may be drawn by a designer by integral calculation or the like, or may be drawn by computer analysis. In addition, when calculating the ground pressure σ without using integration, a method of calculating the maximum value of the actual load of a minute area portion of the foundation structure 100 assuming that the load is uniformly applied to the entire foundation structure 100 has been preferably used, but in this case, the foundation structure 100 would have to be made larger than necessary. Therefore, calculating the ground pressure σ by integration contributes to optimizing the layout design of the structure by making the foundation structure 100 the minimum necessary size.

[0043] From the ground pressure σ calculated by the above calculation, it is determined whether the size of the foundation structure 100 is acceptable (third step S3). This determination may be made by a designer or a computer. That is, it is determined whether the bearing capacity per unit area of ​​the ground exceeds the ground pressure σ. This ensures that the foundation structure 100 does not sink into the ground due to the weight of the structure. If the bearing capacity of the ground exceeds the ground pressure σ (third step S3: YES), it is determined whether the thickness of the reinforcing bar 40 is acceptable (fourth step S4). Specifically, the load applied from the structure to the structure support 30 is transmitted to the concrete 20 and the reinforcing bar 40 via the anchor bolt 50. At this time, a bending moment from the concrete 20 is applied to the base plate 60 that is in contact with the concrete 20 via the non-shrink mortar 70. Whether the thickness of the reinforcing bar 40 is acceptable is determined based on whether the reinforcing bar 40 can withstand the bending moment applied to the end of the base plate 60. This determination may be made by a designer or by a computer, thereby ensuring that the foundation structure 100 will not collapse due to the weight of the structure or the external force F.

[0044] If the bearing capacity of the ground is lower than the ground pressure σ (third step S3: NO), the size (foundation size) of the foundation structure 100 is enlarged (sixth step S6). The amount of enlargement of the size of the foundation structure 100 may be determined by a designer or by a computer. At this time, the amount of eccentricity determined in advance in the determination step (first step S1) is updated as follows. That is, the amount of eccentricity in the foundation structure 100 when the foundation structure 100 is enlarged (the center position of the foundation structure 100 is changed) while keeping the position of the structure support 30 the same as before the enlargement of the foundation structure 100 is set as the new amount of eccentricity. The size of the foundation structure 100 is determined based on this new amount of eccentricity (third step S3).

[0045] If the size of the foundation structure 100 is acceptable (third step S3: YES) but the thickness of the reinforcing bars 40 is insufficient (fourth step S4: NO), it is determined whether the design requirements can be met by simply changing the thickness of the reinforcing bars 40 (seventh step S7). This determination may be made by a designer or a computer. This ensures that the size of the foundation structure 100 is the minimum required. If the design requirements can be met by simply increasing the thickness of the reinforcing bars 40 (seventh step S7: YES), the thickness of the reinforcing bars 40 is increased (eighth step S8). The thickness of the reinforcing bars 40 may be determined by a designer or a computer. It is determined again whether the thickness is acceptable for the foundation structure 100 (fourth step S4). If the design requirements cannot be met by simply changing the thickness of the rebars 40 (seventh step S7: NO), for example, if increasing the thickness (size) of the rebars 40 would relatively reduce the amount of concrete 20 and would result in other design requirements not being met, the size of the foundation structure 100 is enlarged (sixth step S6). Then, the ground pressure σ is calculated based on the size of the enlarged foundation structure 100 (second step S2), and it is determined whether the foundation size is acceptable (third step S3).

[0046] If it is determined by the above flow that the size of the foundation structure 100 is acceptable (third step S3: YES) and that the thickness of the reinforcing bar 40 is acceptable (fourth step S4: YES), it is determined whether the structural support 30 in the foundation structure 100 can be moved by the required amount (fifth step S5). That is, it is determined whether the necessary eccentricity amount (required amount) can be secured from the state (original design) in which the structural support 30 is in the center of the concrete 20 in the foundation structure 100. For example, in the original design, it is assumed that the foundation structure 100 interferes with the neighboring boundary line B by 500 mm. In this case, in the determination step, it is determined that the foundation structure 100 is to be eccentric by 500 mm from the original design. Here, if the foundation structure 100 is enlarged in the determination step and the interference amount of the foundation structure 100 with the neighboring boundary line B increases by 100 mm, the required amount of eccentricity is not satisfied even if the foundation structure 100 can be eccentric by 500 mm. In such a case, it is determined that the necessary amount of eccentricity cannot be secured. This determination may be made by a designer or a computer. This ensures that the structure can be built with the eccentricity of the structure support 30 determined by the above-mentioned consideration. If the structure support 30 can be moved by the required amount (fifth step S5: YES), the flow of the design method is terminated. If the structure support 30 cannot be moved by the required amount (fifth step S5: NO), the process returns to the determination step, and the eccentricity of the structure support 30 is reconsidered (first step S1). That is, the position of the structure support 30 in the structure is considered so that the eccentricity of the foundation structure 100 matches each design condition. Specifically, for example, the eccentricity of the foundation structure 100 can be changed to a movable one by changing the position of the structure support 30, which is the reference position for the eccentricity. The amount of eccentricity of the structural support 30 in the foundation 100 is determined by the above flow.

[0047] When performing a design study of the foundation structure 100 using the above-mentioned flow (for example, complex integral calculations required to calculate the ground pressure σ), the study may be performed by configuring a program that calculates optimal study results by inputting initial conditions by the examiner, and making the computer function as a study device for studying the design of the foundation structure 100. For example, a known spreadsheet software is suitably used to create the program.

[0048] The computer includes at least a processor, a main memory, a storage device, and an interface. The above-described flowchart is stored in the storage device in the form of a program. The processor reads the program from the storage, loads it into the main memory, and executes the above-mentioned processing according to the program. The processor also allocates storage areas in the main memory corresponding to the above-mentioned storage units according to the program. Examples of the processor include a CPU (Central Processing Unit), a GPU (Graphic Processing Unit), and a microprocessor.

[0049] The program may be for realizing a part of the functions to be performed by the computer. For example, the program may be for realizing the functions by combining with other programs already stored in the storage or by combining with other programs implemented in other devices. In another embodiment, the computer may be provided with a custom (Large Scale Integrated Circuit) such as a PLD (Programmable Logic Device) in addition to the above configuration or instead of the above configuration. Examples of PLDs include PAL (Programmable Array Logic), GAL (Generic Array Logic), CPLD (Complex Programmable Logic Device), and FPGA (Field Programmable Gate Array). In this case, some or all of the functions to be realized by the processor may be realized by the integrated circuit. Such an integrated circuit is also included in an example of a processor.

[0050] Examples of storage include magnetic disks, magneto-optical disks, optical disks, and semiconductor memories. The storage may be an internal medium directly connected to a bus of the computer, or an external medium connected to the computer via an interface or a communication line. In addition, when the program is distributed to a computer via a communication line, the computer receiving the program may load the program into a main memory and execute the above-mentioned process. In at least one embodiment, the storage is a non-transitory tangible storage medium.

[0051] The interface has a role of allowing the designer to input information required for the program processing, such as the weight of the structure, the size of the foundation structure 100, and the amount of eccentricity of the structure support 30, and displaying to the designer the ground pressure σ calculated by the program, the analysis results of bending moment, or the results of judgments made by a computer regarding each of the above steps, etc. This allows the designer to visually check the results of the study and determine the final amount of eccentricity.

[0052] Next, the design concept of the foundation structure 100 according to this embodiment will be described using an example of a structure shown in FIG. 7. Hereinafter, the foundation structure 100 on the first side (left side of the paper) in FIG. 7 will be referred to as the first foundation structure 101, and the foundation structure 100 on the second side (right side of the paper) will be referred to as the second foundation structure 102. At this time, as shown in FIG. 7, it is preferable that the eccentric directions of the first foundation structure 101 and the second foundation structure 102 are eccentric so that the respective concrete 20 moves toward the inside of the structures with respect to the respective structure supports 30. In other words, it is preferable that the first foundation structure 101 and the second foundation structure 102 are eccentric so as to approach each other.

[0053] Consider the case where the eccentricity between the first foundation structure 101 and the second foundation structure 102 is determined by the conditions described above, and an external force F is applied from the first side to the second side due to a strong wind, earthquake, etc. When an external force F is applied to the structure, a bending moment is generated in the first foundation structure 101 and the second foundation structure 102 via the structure support 30, as shown in Figures 8 and 9. This bending moment generates a pull-out force P that tries to pull out the first side ends of the first foundation structure 101 and the second foundation structure 102 from the ground, as shown in Figures 8 and 9.

[0054] At this time, the structure support column 30 of the first foundation structure 101 is eccentric to the first side, as shown in Fig. 8. Therefore, the weight of the structure, i.e., the axial force A of the structure support column 30, acts to cancel out the pull-out force P acting on the first foundation structure 101. 9, the structure support column 30 in the second foundation structure 102 is eccentric to the second side. Therefore, the axial force A of the structure support column 30 acts to increase the pull-out force P acting on the second foundation structure 102.

[0055] Here, in the calculation of the ground pressure σ in the above-mentioned design method (second step S2), the external force F applied to the structure is taken into consideration. At this time, the bending moment generated in the first foundation structure 101 and the second foundation structure 102 as described above acts to lift up a part of the concrete 20. For this reason, it is not possible to take into consideration the entire area of ​​the concrete 20 in the foundation structure 100.

[0056] 8, when the axial force A of the structure support column 30 acts to counteract the pull-out force P, the effect of the external force F on the foundation structure 100 becomes relatively small. For this reason, the influence of the axial force A, i.e., the weight of the structure, becomes large in determining the size of the foundation structure 100. 9, when the axial force A of the structural support column 30 acts to increase the pull-out force P, the effect of the external force F on the foundation structure 100 becomes relatively large. For this reason, the effect of the external force F on the determination of the size of the foundation structure 100 becomes large.

[0057] Taking into account the above characteristics, a comparison will be made between a structure that is a single-story building and a structure that is two or more stories high. When the structure is a one-story building, the weight of the structure is relatively small, and therefore the axial force A loaded on the structure support 30 is also relatively small. Therefore, the influence of the external force F on the ground pressure σ becomes large, and therefore the influence of the external force F on the factors determining the size of the foundation structure 100 also becomes large. In contrast, in the case of a structure having two or more floors, the weight of the structure is relatively large, and therefore the axial force A applied to the structure support column 30 is also relatively large. Therefore, the influence of the axial force A on the ground pressure σ is large, and therefore the influence of the axial force A on the factors determining the size of the foundation structure 100 is also large.

[0058] In this case, the effect of the external force F on the foundation structure 100 can be counteracted by changing the eccentric direction of the structure support 30, whereas the axial force A, i.e., the weight of the structure, can be dealt with simply by increasing the size of the foundation structure 100. In other words, if the ground pressure σ increases due to the weight of the structure, it is necessary to increase the size of the foundation structure 100.

[0059] Here, it is preferable that the size of the concrete 20 in the foundation structure 100 be the minimum necessary. As described above, the eccentricity of the structure support 30 in the foundation structure 100 is performed in order to locate the structure support 30 closer to the neighboring boundary line B when the position at which the foundation structure 100 is to be installed is close to the neighboring boundary line B. In this case, as shown in Fig. 6, if the size of the foundation structure 100 is large, the concrete 20 is more likely to interfere with the neighboring boundary line B when the structure support 30 is installed at the same position relative to the neighboring boundary line B, compared to when the size of the foundation structure 100 is small, and therefore the effect of the eccentricity cannot be fully enjoyed. For this reason, the foundation structure 100 in this embodiment in which the structural support column 30 is eccentric is preferably used for a relatively light one-story building.

[0060] As described above, according to the foundation structure 100 of this embodiment, the structure support 30 is fixed at a position eccentric from the center of the outer frame 10. As a result, when the position of the structure support 30 is close to the neighboring boundary line B, by eccentrically positioning the structure support 30 without changing the position of the outer frame 10, it is possible to provide only the structure support 30 near the neighboring boundary line B. Therefore, it is possible to provide the foundation structure 100 in which the pillar can be provided at a location closer to the neighboring boundary line B.

[0061] In addition, the position of the structural support 30 is eccentric from the center of the outer frame 10 along the extension direction of the reinforcing bars 40 by an integer multiple of the interval at which the reinforcing bars 40 are arranged. In this way, by gradually adjusting the eccentricity of the structural support 30, the amount of eccentricity can be efficiently considered in the design study of the structure. In addition, when the structural support 30 is eccentric, interference between the anchor bolts 50 that fasten the structural support 30 to the foundation structure 100 and the reinforcing bars 40 can be prevented.

[0062] Moreover, the outer frame 10 is cylindrical. That is, the foundation structure 100 is cylindrical. This makes it possible to prevent stress concentration from occurring in the foundation structure 100 when a load is applied to the structural support columns 30 provided on the foundation structure 100. This can further contribute to the durability performance of the foundation structure 100. Furthermore, making the outer frame 10 cylindrical makes it easier to manufacture the foundation structure 100. This can contribute to shortening the process.

[0063] In addition, after the amount of eccentricity of the structural support 30 is determined in the determination step, it is judged whether or not the design conditions are satisfied in the judgment step. In other words, the amount of eccentricity of the structural support 30 is determined in advance, and then only whether or not the design conditions are satisfied is examined. This makes it possible to reduce the time required for examination, compared to a method in which an optimal amount of eccentricity is calculated as an examination result that incorporates each condition. Therefore, design examination can be performed efficiently.

[0064] Furthermore, by determining in advance the amount of eccentricity of the structure support 30, i.e., the position of the structure support 30 in the structure, the layout design of the structure can be performed in parallel with the consideration of the foundation structure 100. In other words, the layout design of the structure can be performed more efficiently and flexibly compared to the case where the layout design of the structure is performed after waiting for the optimum amount of eccentricity to be calculated.

[0065] The information used in the determination step also includes the ground pressure σ. Specifically, it is determined that the ground pressure σ does not exceed the bearing capacity of the ground. Here, the ground pressure σ refers to the load per unit area acting on the foundation structure 100. Using the information on the ground pressure σ to consider the amount of eccentricity of the structure support 30 can contribute to ensuring the strength and durability of the structure.

[0066] Moreover, the information used in the determination step includes the size of the foundation structure 100. Using the information on the size of the foundation structure 100 to consider the amount of eccentricity of the structure support column 30 can contribute to satisfying conditions related to the layout of the structure.

[0067] The information used in the determination step also includes the thickness of the reinforcing bars 40. By using information on the thickness of the reinforcing bars 40 to consider the amount of eccentricity of the structural support 30, it is possible to carry out a design while understanding the relationship between the amount of concrete 20 and the amount of reinforcing bars 40 inside the outer frame 10 of the foundation structure 100. This contributes to achieving the best possible results at the construction site while balancing the size of the foundation structure 100, the necessary strength, the budget, and the like.

[0068] Moreover, the information used in the judgment step includes whether or not it is necessary to increase the size of the reinforcing bars 40. In other words, when examining the amount of eccentricity of the structural support 30, the increase in size of the reinforcing bars 40 provided in the foundation structure 100 is taken into consideration. As a result, when the design conditions can be satisfied only by increasing the size of the reinforcing bars 40 provided inside the foundation structure 100, the foundation structure 100 can be provided without changing the size of the entire foundation structure. In other words, the foundation structure 100 can be provided with the minimum necessary size. This contributes to facilitating the layout of the structure. Furthermore, by minimizing the amount of concrete 20 poured into the foundation structure 100, it contributes to improving cost efficiency.

[0069] The information used in the determination step also includes the possible movement amount of the structural support 30. That is, the movement amount is considered within the possible movement range of the structural support 30 in the foundation 100. This makes it possible to achieve both the necessary movement amount of the structural support 30 in the foundation 100 and the strength of the foundation 100.

[0070] Furthermore, the design and examination of the foundation structure 100 according to the present invention is carried out by a program. This makes it possible to minimize human errors that may occur when inputting numerical values, etc., and also contributes to reducing labor costs.

[0071] Moreover, the foundation structure 100 according to the present invention is applied to a one-story building, whereby the effects of the foundation structure 100 according to the present invention can be enjoyed to the maximum extent.

[0072] The technical scope of the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention. For example, instead of increasing the thickness of the reinforcing bars 40 in the reversing step (eighth step S8), the pitch at which the reinforcing bars 40 are arranged may be reduced to increase the quantity of the reinforcing bars 40. Furthermore, when the foundation structure 100 needs to be large due to conditions such as the ground pressure σ, the outer frame 10 and the concrete 20 in the foundation structure 100 may be connected in series (a so-called figure eight shape). Furthermore, when the design method according to this embodiment is carried out by a program as described above, rather than the designer inputting the amount of eccentricity, the size of the foundation structure 100, or the thickness of the reinforcing bars 40 into an interface and making the final decision himself, the program may be such that the size of the foundation structure 100 and the thickness of the reinforcing bars 40 are calculated under optimal conditions by inputting only the position of the structural support 30 required for the structure and the position of the neighboring boundary line B.

[0073] In addition, within the scope of the invention, the components in the above-described embodiments may be replaced with well-known components, and the above-described modified examples may be combined as appropriate. [Explanation of symbols]

[0074] 10 Outer Frame 20. Concrete 30 Structural support 40 Steel Bar 100 Basic structure σ Ground pressure

Claims

1. A foundation structure for supporting a structural column, An outer frame having a curved surface formed by a thin steel plate; Concrete filled inside the outer frame and integrated with the outer frame; Equipped with A plurality of reinforcing bars are arranged at intervals within the concrete, The outer frame is formed by connecting longitudinal ends of a strip-like shape, The structural support is fixed at a position eccentric to the center of the outer frame, The position of the structural support is offset from the center of the outer frame toward the neighboring boundary line along the extension direction of the reinforcing bar. Basic structure.

2. A foundation structure for supporting a structural column, An outer frame having a curved surface formed by a thin steel plate; Concrete filled inside the outer frame and integrated with the outer frame; Equipped with A plurality of reinforcing bars are arranged at intervals within the concrete, The outer frame is formed by connecting longitudinal ends of a strip-like shape, The structural support is fixed at a position eccentric to the center of the outer frame, The reinforcing bar is not parallel to the boundary line of the neighboring property. Basic structure.

3. The structural support is installed on the concrete.

3. The base structure according to claim 1 or 2.

4. A foundation structure for supporting a structural column, An outer frame having a curved surface formed by a thin steel plate; Concrete filled inside the outer frame and integrated with the outer frame; Equipped with A plurality of reinforcing bars are arranged at intervals within the concrete, the structural support is disposed on the concrete; Anchor bolts for fixing the structural support are arranged inside the concrete so as not to interfere with the reinforcing bars, The structural support is fixed at a position eccentric to the center of the outer frame. Basic structure.

5. The position of the structural support is offset from the center of the outer frame toward the neighboring boundary line along the extension direction of the reinforcing bars. The base structure according to claim 4.

6. The reinforcing bar is not parallel to the boundary line of the neighboring property. The base structure according to claim 4.

7. A foundation structure for supporting a structural column, An outer frame having a curved surface formed by a thin steel plate; Concrete filled inside the outer frame and integrated with the outer frame; Equipped with A plurality of reinforcing bars are disposed at equal intervals within the concrete, The outer frame is formed by connecting longitudinal ends of a strip-like shape, The structural support is fixed at a position eccentric to the center of the outer frame, The position of the structural support is eccentric from the center of the outer frame along the extension direction of the reinforcing bars by an integer multiple of the interval at which the reinforcing bars are arranged. Basic structure.

8. The outer frame is cylindrical. A substructure according to any one of claims 1 to 7.

9. A design method for determining an eccentricity of a structural support from a center of the outer frame in a foundation structure that supports a structural support, the design method comprising: an outer frame having a curved surface formed by thin steel plates; concrete that is filled inside the outer frame and integrated with the outer frame; and a plurality of reinforcing bars arranged at intervals inside the concrete, the method comprising: A determination step of determining the amount of eccentricity of the structural support column fixed at a position eccentric to the center of the outer frame; a first determination step of determining whether or not the basic structure needs to be enlarged based on the amount of eccentricity determined in the determination step; Characterized in that it has How to design foundation structures.

10. A design method for determining an eccentricity of a structural support from a center of the outer frame in a foundation structure that supports a structural support, the design method comprising: an outer frame having a curved surface formed by thin steel plates; concrete that is filled inside the outer frame and integrated with the outer frame; and a plurality of reinforcing bars arranged at intervals inside the concrete, the method comprising: A determination step of determining the amount of eccentricity of the structural support column fixed at a position eccentric to the center of the outer frame; A second determination step of determining whether the eccentricity amount determined in the determination step can be dealt with by simply changing the thickness of the reinforcing bar; having In the second determination step, when the eccentricity amount cannot be dealt with only by changing the thickness of the reinforcing bar, it is determined that the foundation structure needs to be expanded. How to design foundation structures.

11. The method further comprises a first judgment step of judging whether the amount of eccentricity determined in the determination step requires expansion of the foundation structure, or a second judgment step of judging whether the amount of eccentricity determined in the determination step can be dealt with by simply changing the thickness of the reinforcing bars, and if it is judged that expansion of the foundation structure is necessary, a third judgment step of judging whether the amount of eccentricity can be dealt with by the expansion. A method for designing a foundation structure according to claim 9 or 10.

12. In a first judgment step of judging whether or not the amount of eccentricity determined in the determination step requires expansion of the foundation structure, or in a second judgment step of judging whether or not the amount of eccentricity determined in the determination step can be dealt with by only changing the thickness of the reinforcing bars, if it is judged that the expansion of the foundation structure is necessary, or if it is judged that the amount of eccentricity cannot be dealt with by the enlargement in a third judgment step of judging whether or not the amount of eccentricity can be dealt with by the enlargement, The method further comprises the step of: A method for designing a foundation structure according to any one of claims 9 to 11.

13. The amount of eccentricity is Information on ground pressure, which is a load per unit area acting on the foundation structure; and Information on the size of the substructure; and The method for designing a foundation structure according to claim 9, wherein the design is made using at least one of the following:

14. A program for causing a computer to function as a reviewing device for reviewing a design of a foundation structure by using the design method of a foundation structure according to any one of claims 9 to 13.

15. The base structure according to any one of claims 1 to 8 is provided. Single-storey building.

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