Foundation structure and construction method for foundation structure

Abstract

To reduce the amount of soil placed on a base portion of a continuous footing.SOLUTION: Foundation structure 100 comprises a continuous footing 101 having a base portion 102 and a rising portion 103, a support member 10 placed to be adjacent to the base portion 102, and backfill soil 104 backfilled in an area surrounded with the continuous footing 101. The support member 10 has a first piece 11 arranged so that a thickness direction thereof is along the vertical direction and fixed to crushed stone 105 or basal concrete, a second piece 12 bent from the first piece 11 and extending upward to face a side surface 102b of the base portion 102, and a third piece 13 bent from the second piece 12 and extending in a direction approaching the rising portion 103, placed above and away from an upper surface 102a of the base portion 102, and covering the upper surface 102a of the base portion 102.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a foundation structure and a construction method for the foundation structure. [Background technology]

[0002] A concrete support structure is known in which concrete is poured on top of backfilled soil in an area surrounded by an inverted T-shaped strip footing consisting of a rising section and a base section. In this support structure, pipes are placed on top of the base section inside the strip footing, reinforcing bars are inserted into the pipes, and concrete is poured into them. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2010-95920 Summary of the Invention [Problem to be solved by the invention]

[0004] If the height of the soil placed on the base of the continuous foundation increases, the base must be made wider, which increases costs.

[0005] An object of the present invention is to provide a foundation structure that can reduce the amount of soil placed on the base portion of a continuous footing. [Means for solving the problem]

[0006] One aspect of the base structure according to the present invention is a strip foundation having a base portion and a rising portion; a support member disposed adjacent to the base portion; backfill soil filled in the area surrounded by the strip foundation; The support member is A first piece is arranged so that the thickness direction of the plate is along the vertical direction and is fixed to crushed stone or concrete; a second piece bent from the first piece and extending upward to face a side surface of the base portion; and a third piece that is bent from the second piece and extends in a direction approaching the rising portion, is positioned above and spaced apart from the upper surface of the base portion, and covers the upper surface of the base portion.

[0007] According to this aspect, a gap is formed between the upper surface of the base portion and the third piece, so that backfill soil is not placed between the upper surface of the base portion and the third piece. With this type of foundation structure, a gap is formed above the base portion where backfill soil is not placed, so that the amount of soil placed on the base portion can be reduced.

[0008] In another aspect of the present invention, The support member is A fourth piece is provided that is bent from the third piece and extends in the vertical direction, and abuts against a side surface of the rising portion.

[0009] According to this aspect, by having the fourth piece bent from the tip of the third piece abut against the side of the rising portion, the force acting on the tip of the third piece can be received by the rising portion, and the backfill soil placed on the third piece can be supported by the third piece.

[0010] In another aspect of the present invention, The third piece is arranged so as to be inclined when viewed in the longitudinal direction of the continuous foundation, and the end closer to the side of the rising portion is arranged higher than the end closer to the second piece.

[0011] According to this aspect, by arranging the third piece at an angle, the surface area of the third piece arranged above the base portion can be increased. According to this aspect, the third piece is less likely to deform even when subjected to the load of soil.

[0012] In another aspect of the present invention, The thickness direction of the third piece is arranged along the vertical direction.

[0013] In another aspect of the present invention, The third piece is formed so as to protrude on both sides of the second piece in the plate thickness direction when viewed in the longitudinal direction of the continuous footing.

[0014] According to this aspect, the backfill soil can be received by the third pieces formed to extend from the second pieces on both sides in the thickness direction of the second pieces, and the load can be received in a balanced manner on the second pieces.

[0015] In another aspect of the present invention, A buffer material is provided between the upper surface of the base portion and the lower surface of the third piece.

[0016] According to this aspect, the buffer material disposed on the underside of the third piece can prevent concrete from flowing in when pouring the concrete, thereby forming a gap between the underside of the third piece and the upper surface of the base portion.

[0017] One aspect of the foundation structure construction method according to the present invention is to a strip foundation having a base portion and a rising portion; a support member disposed adjacent to the base portion; backfill soil filled in the area surrounded by the strip foundation; The support member is A first piece is arranged so that the thickness direction of the plate is along the vertical direction and is fixed to crushed stone or concrete; a second piece bent from the first piece and extending upward to abut against a side surface of the base portion; a third piece bent from the second piece and extending in a direction approaching the rising portion, disposed above and spaced apart from the upper surface of the base portion, and covering the upper surface of the base portion, a step of placing a pair of first mold forms for forming the rising portion; A step of arranging a pair of the support members as a second formwork for forming the base portion and fixing the first pieces of the support members to crushed stone or mortar; Pouring concrete between the pair of first formworks and between the pair of second formworks; removing the pair of first formworks; and backfilling the backfill soil into the area surrounded by the strip footing.

[0018] According to this aspect, the base portion can be formed by placing a pair of support members as a second formwork for forming the base portion and pouring concrete between the pair of support members. The second formwork used to form the base portion can be used as the support members. By forming a gap between the third piece of this support member and the upper surface of the base portion, backfill soil is not placed between the upper surface of the base portion and the third piece. In this way, by forming a gap above the base portion where backfill soil is not placed, the amount of soil placed on the base portion can be reduced.

[0019] One aspect of the foundation structure construction method according to the present invention is to a strip foundation having a base portion and a rising portion; a support member disposed adjacent to the base portion; backfill soil filled in the area surrounded by the strip foundation; The support member is A first piece is arranged so that the thickness direction of the plate is along the vertical direction and is fixed to crushed stone or concrete; a second piece bent from the first piece and extending upward to abut against a side surface of the base portion; a third piece bent from the second piece and extending in a direction approaching the rising portion, disposed above and spaced apart from the upper surface of the base portion, and covering the upper surface of the base portion, a step of placing a pair of first mold forms for forming the rising portion; A process of arranging a pair of the support members in a state before the third pieces are bent as a second formwork for forming the base portion, and fixing the first pieces of the support members to crushed stone or mortar; Pouring concrete between the pair of first formworks and between the pair of second formworks; removing the pair of first formworks; a step of bending the third piece of the support member, which is a pair of the second formwork frames, relative to the second piece and arranging it so as to cover an upper surface of the base portion; and backfilling the backfill soil into the area surrounded by the strip footing.

[0020] According to this aspect, the base portion can be formed by placing a pair of support members in a state before the third piece is bent as the second formwork for forming the base portion, and pouring concrete between the pair of support members. The second formwork used to form the base portion can be bent to form the third piece and used as the support member. By forming a gap between this support member, the third piece, and the upper surface of the base portion, backfill soil is not placed between the upper surface of the base portion and the third piece. In this way, by forming a gap above the base portion where backfill soil is not placed, the amount of soil placed on the base portion can be reduced. [Effects of the Invention]

[0021] As can be understood from the above explanation, the present invention can provide a foundation structure and a construction method for the foundation structure that can reduce the amount of soil placed on the base portion of the continuous footing. [Brief explanation of the drawings]

[0022] [Figure 1] FIG. 2 is a perspective view showing the continuous footing and support members of the foundation structure according to the first embodiment. [Figure 2] 1 is a cross-sectional view showing a strip footing, a support member, and backfill soil of the foundation structure according to the first embodiment. FIG. [Figure 3] FIG. 10 is a perspective view showing a continuous footing and a support member of the foundation structure according to the second embodiment. [Figure 4] FIG. 10 is a cross-sectional view showing the strip footing, support members, and backfill soil of the foundation structure according to the second embodiment. [Figure 5] FIG. 11 is a cross-sectional view showing the strip footing, support members, and backfill soil of the foundation structure according to the third embodiment. [Figure 6] FIG. 10 is a process diagram showing the steps of a construction method for a foundation structure according to a fourth embodiment. [Figure 7] FIG. 10 is a cross-sectional view showing the continuous footing, support members, and formwork of the foundation structure according to the fourth embodiment. [Figure 8] FIG. 10 is a process diagram showing the steps of a construction method for a foundation structure according to a fifth embodiment. [Figure 9] FIG. 10 is a cross-sectional view showing the continuous footing, support members, and formwork of the foundation structure according to the fifth embodiment. [Figure 10] FIG. 10(a) is a perspective view showing the support member before being bent, and FIG. 10(b) is a perspective view showing the support member after being bent. [Figure 11] FIG. 10 is a cross-sectional view showing a support member of a foundation structure according to a first modified example. [Figure 12] FIG. 10 is a cross-sectional view showing a support member of a foundation structure according to a second modified example. DETAILED DESCRIPTION OF THE INVENTION

[0023] Hereinafter, a foundation structure and a construction method for the foundation structure according to an embodiment will be described with reference to the accompanying drawings. In this specification and drawings, substantially identical components are designated by the same reference numerals, and redundant description may be omitted.

[0024] [Base structure 100 according to the first embodiment] FIG. 1 is a perspective view showing a line footing 101 and a support member 10 of a foundation structure 100 according to the first embodiment. FIG. 2 is a cross-sectional view showing the line footing, support member, and backfill soil of the foundation structure 100 according to the first embodiment. In each drawing, arrows indicating the mutually orthogonal X-axis, Y-axis, and Z-axis directions may be illustrated. The X-axis and Y-axis directions are horizontal. The Z-axis direction is vertical.

[0025] 1 and 2, the foundation structure 100 includes a line footing 101 and a support member 10. As shown in Fig. 2, the foundation structure 100 includes backfill soil 104. Fig. 1 illustrates the state before the backfill soil 104 is installed.

[0026] [Spread Foundation 101] As shown in Figure 2, the continuous footing 101 is constructed on crushed stone 105. The continuous footing 101 may also be constructed on basal concrete. The continuous footing 101 has a base portion 102 and a rising portion 103. The rising portion 103 stands perpendicular to the ground surface. The upper end of the rising portion 103 supports the building. The base portion 102 is connected to the lower end of the rising portion 103 and supports the rising portion 103. The base portion 102 extends in the width direction of the rising portion 103. The base portion 102 transmits the load of the building to the ground surface via the crushed stone 105. In Figures 1 and 2, the width direction of the rising portion 103 is along the X-axis direction. The continuous footing 101 is formed to surround a predetermined area.

[0027] [Support member 10] The support member 10 is disposed adjacent to the continuous foundation 101 in the X-axis direction. The support member 10 may be formed on one side or both sides of the continuous foundation 101 in the X-axis direction. The support member 10 has a first piece 11, a second piece 12, a third piece 13, and a fourth piece 14. The support member 10 can be formed by bending a single metal piece. The support member 10 is continuous in the longitudinal direction of the continuous foundation 101.

[0028] [1st piece 11] The thickness direction of the first piece 11 is along the Z-axis direction. The first piece 11 is disposed adjacent to the base portion 102 in the X-axis direction. The first piece 11 is disposed on the crushed stone 105 and fixed to the crushed stone 105 using a fixing pin 21. As shown in FIG. 1, the first piece 11 has a through hole 11a that penetrates in the thickness direction, and the fixing pin 21 is inserted into this through hole 11a.

[0029] [Second piece 12] The second piece 12 is bent from the first piece 11 and extends upward. The thickness direction of the second piece 12 is along the X-axis direction. The second piece 12 is arranged so as to face the side surface 102b of the base portion 102 in the X-axis direction. The second piece 12 abuts against the side surface 102b of the base portion 102. The lower end of the second piece 12 is connected to the first piece 11, and the upper end of the second piece 12 is connected to the third piece. The second piece 12 protrudes above the upper surface 102a of the base portion 102. The upper end of the second piece 12 is arranged above the upper surface 102a of the base portion 102.

[0030] [3rd piece 13] The third piece 13 is bent from the second piece 12 and extends in a direction approaching the rising portion 103. One end of the third piece 13 is connected to the upper end of the second piece 12, and the other end of the third piece 13 is positioned close to the rising portion 103 and connected to the fourth piece 14. The third piece 13 is positioned so as to be inclined with respect to the horizontal plane (XY plane) when viewed in the longitudinal direction (Y-axis direction) of the continuous foundation 101. The end of the third piece 13 closer to the rising portion 103 is positioned higher than the end of the third piece 13 closer to the second piece 12.

[0031] The third piece 13 is disposed above and spaced apart from the upper surface 102a of the base portion 102. The third piece 13 is formed so as to cover the upper surface 102a of the base portion 102. A gap C is formed between the upper surface 102a of the base portion 102 and the lower surface 13b of the third piece 13. No backfill soil 104 is placed in this gap C. The gap C may be hollow.

[0032] [4th piece 14] Fourth piece 14 is bent and protrudes upward from third piece 13. The thickness direction of fourth piece 14 is along the X-axis direction. The surface of fourth piece 14 closer to rising portion 103 abuts against side surface 103b of rising portion 103.

[0033] [Backfill soil 104] As shown in FIG. 2 , backfill soil 104 is backfilled in the area surrounded by the continuous footing 101 after the construction of the continuous footing 101. The backfill soil 104 is located on the inside of the building in a plan view. The backfill soil 104 is compacted, for example, by a compactor. After compaction, the height of the upper surface 104a of the backfill soil 104 is lower than the upper surface 103a of the rising portion 103.

[0034] [Height δ of the gap C between the support member 10 and the base portion 102] In the foundation structure 100, a gap C is formed between the support member 10 and the base 102. The gap C is the gap between the upper surface 102a of the support member 10 and the lower surface 13b of the third piece 13. The height δ of the gap C is greater than the amount of settlement of the backfill soil 104 due to compaction. The amount of settlement of the backfill soil 104 due to compaction is, for example, the difference between the upper surface 104a of the backfill soil 104 before compaction and the upper surface 104a of the backfill soil 104 after compaction. The height of the gap C may be the length along the Z-axis direction between the lower surface 13b of the third piece 13 and the upper surface 102a of the base 102. The height of the gap C may be the minimum height, or the length along the Z-axis direction between the lower surface 13b of the lower end of the third piece 13 and the upper surface 102a of the base 102. The height of the gap C may be the length between the bending point between the third piece 13 and the second piece 12 and the upper surface 102a of the base portion 102.

[0035] The foundation structure 100 may also include a concrete slab (not shown) formed on the upper surface 104a of the backfill soil 104.

[0036] [Actions and Effects of the Foundation Structure 100 According to the First Embodiment] The foundation structure 100 of the first embodiment comprises a slab footing 101 having a base portion 102 and a rising portion 103, a support member 10 arranged adjacent to the base portion 102, and backfill soil 104 backfilled in the area surrounded by the slab footing 101, and the support member 10 has a first piece 11 arranged so that the thickness direction is along the vertical direction (Z-axis direction) and fixed to crushed stone 105 (or basal concrete), a second piece 12 bent from the first piece 11 and extending upward to face the side surface 102b of the base portion 102, and a third piece 13 bent from the second piece 12 and extending in a direction approaching the rising portion 103, arranged above and away from the upper surface 102a of the base portion 102, and covering the upper surface 102a of the base portion 102.

[0037] According to this foundation structure 100, a gap C is formed between the upper surface 102a of the base portion 102 and the third piece 13, so that backfill soil 104 is not placed between the upper surface 102a of the base portion 102 and the third piece 13. According to this foundation structure 100, the gap C where backfill soil 104 is not placed is formed on the base portion 102, so that the amount of soil placed on the base portion 102 can be reduced. The foundation structure 100 can suppress the load acting on the base portion 102, so that an increase in the width of the base portion 102 can be suppressed.

[0038] According to the foundation structure 100, it is possible to suppress an increase in the width of the base portion 102, thereby suppressing an increase in the construction cost of the foundation structure 100. Furthermore, if the width of the base portion 102 is increased, depending on the site conditions, it may affect the site boundary line, which may require changes to the building construction plan. However, the foundation structure 100 according to this embodiment can suppress an increase in the width of the base portion 102, thereby suppressing the risk of plan changes. Furthermore, it is possible to reduce the load on the base portion 102 by placing insulation material on top of the base portion 102, but depending on the type of insulation material, there is a risk of termite damage. However, with the foundation structure 100 according to this embodiment, there is no risk of this.

[0039] In the base structure 100, the support member 10 is provided with a fourth piece 14 that is bent from the third piece 13 and extends in the vertical direction, and abuts against the side surface 103b of the rising portion 103.

[0040] According to the foundation structure 100 having this configuration, the fourth piece 14 bent from the tip of the third piece 13 is brought into contact with the side surface 103b of the rising portion 103, so that the force acting on the tip of the third piece 13 can be borne by the rising portion 103. The backfill soil 104 placed on the third piece 13 can be supported by the third piece 13. The load acting on the upper surface 102a of the base portion 102 can be reduced.

[0041] In addition, in the foundation structure 100, the third piece 13 is arranged so as to be inclined when viewed in the longitudinal direction (Y-axis direction) of the slab foundation 101, and the end closer to the side surface 103b of the rising portion 103 is arranged higher than the end closer to the second piece 12.

[0042] According to the foundation structure 100 having this configuration, by arranging the third piece 13 at an angle with respect to the horizontal plane (XY plane), it is possible to increase the surface area of the third piece 13 arranged above the base portion 102. According to the foundation structure 100 of this embodiment, the third piece 13 is less likely to deform even when subjected to the load of the backfill soil 104.

[0043] [Base structure 100B according to the second embodiment] Next, a foundation structure 100B according to a second embodiment will be described. FIG. 3 is a perspective view showing the line footing 101 and support members 10B of the foundation structure 100B according to the second embodiment. FIG. 4 is a cross-sectional view showing the line footing 101, support members 10B, and backfill soil 104 of the foundation structure 100B according to the second embodiment. The foundation structure 100B according to the second embodiment differs from the foundation structure 100 according to the first embodiment in that, instead of the support members 10, support members 10B having a shape different from that of the support members 10 are provided. Note that, in the description of the second embodiment, explanations similar to those of the first embodiment will be omitted.

[0044] [Third piece 13B of support member 10B] The support member 10B has a first piece 11, a second piece 12, a third piece 13B, and a fourth piece 14. The third piece 13B is bent from the second piece 12 and extends in a direction approaching the rising portion 103. One end of the third piece 13B is connected to the upper end of the second piece 12, and the other end of the third piece 13B is positioned close to the rising portion 103 and connected to the fourth piece 14. The third piece 13B is arranged along a horizontal plane (XY plane) when viewed in the longitudinal direction (Y-axis direction) of the continuous footing 101. The thickness direction of the third piece 13B is along the Z-axis direction.

[0045] The foundation structure 100B according to the second embodiment also achieves the same effects as the foundation structure 100 according to the first embodiment. In the foundation structure 100B, the thickness direction of the third piece 13B is arranged along the vertical direction. In this way, the third piece 13B does not need to be inclined. In the foundation structure 100B with this structure, the material cost of the support member 10B can be reduced.

[0046] [Base structure 100C according to the third embodiment] Next, a foundation structure 100C according to a third embodiment will be described. Fig. 5 is a cross-sectional view showing the continuous footing 101, support members 10C, and backfill soil 104 of the foundation structure 100C according to the third embodiment. The foundation structure 100C according to the third embodiment differs from the foundation structure 100 according to the first embodiment in that, instead of the support members 10, the foundation structure 100C has support members 10C having a shape different from that of the support members 10. Note that, in the description of the third embodiment, explanations similar to those of the first and second embodiments will be omitted.

[0047] [Third piece 13C of support member 10C] The support member 10C has a first piece 11, a second piece 12, and a third piece 13C. When viewed in the longitudinal direction of the continuous footing 101, the third piece 13C is formed so as to protrude on both sides of the second piece 12 in the plate thickness direction (X-axis direction). The third piece 13C may be welded to the upper end of the second piece 12, for example. The third piece 13C protrudes from the upper end of the second piece 12 in a direction approaching the rising portion 103 and in a direction away from the rising portion 103. In the width direction of the third piece 13C, the length that protrudes from the second piece 12 (width along the X-axis direction) may be longer than the width of the first piece 11.

[0048] The foundation structure 100C according to the third embodiment also achieves the same effects as the foundation structure 100 according to the first embodiment. In the foundation structure 100C, the backfill soil 104 can be received by the third pieces 13C formed to protrude from the second pieces 12 on both sides in the thickness direction (X-axis direction) of the second pieces 12. In the foundation structure 100C, the second pieces 12 can receive the load in a balanced manner.

[0049] [Base structure 100D according to the fourth embodiment] Next, a construction method for a foundation structure 100D according to the fourth embodiment will be described. FIG. 6 is a process diagram showing the steps of the construction method for a foundation structure 100D according to the fourth embodiment. FIG. 7 is a cross-sectional view showing the continuous footing 101, support member 10, and formwork 25 of the foundation structure 100D according to the fourth embodiment. Note that in the description of the fourth embodiment, explanations that are the same as those of the first to third embodiments will be omitted. The foundation structure 100D according to the fourth embodiment shown in FIG. 7 has substantially the same configuration as the foundation structure 100B according to the second embodiment shown in FIG.

[0050] The construction method for the foundation structure 100D according to the fourth embodiment includes a step of placing the formwork 25 for the rising portion 103 (step S11), a step of placing the formwork (support member 10B) for the base portion 102 (step S12), a step of pouring concrete inside the formwork 25 (step S13), a step of removing the formwork 25 for the rising portion 103 (step S14), and a step of backfilling with backfill soil 104 (step S15).

[0051] In the step of placing molds 25 for rising portions 103 (step S11), a pair of molds (first molds) 25 for forming rising portions 103 are placed at predetermined positions.

[0052] In the process of placing the formwork for the base portion 102 (step S12), a pair of support members 10B are placed as a formwork (second formwork) for forming the base portion 102, and the first piece 11 of the support member 10B is fixed to crushed stone 105 (or basal concrete). A buffer material 26 is attached to the underside 13b of the third piece 13B. The buffer material 26 may be, for example, a sponge or other material. The density of the buffer material 26 is lower than the density of the backfill soil 104. The buffer material 26 is capable of forming a gap C by preventing the inflow of concrete. The buffer material 26 is placed in the gap C. The gap C does not have to be hollow.

[0053] In the step of pouring concrete inside the formwork (step S13), concrete is poured between the pair of formworks (first formworks) 25 and into the pair of support members (second formworks) 10B, thereby forming the rising portion 103 and the base portion 102.

[0054] In the step of removing formwork 25 of rising portion 103 (step S14), the pair of formwork 25 is removed after the concrete has hardened.

[0055] In the step of backfilling the backfill soil 104 (step S15), the backfill soil 104 is backfilled into the area surrounded by the continuous footing 101. A worker compacts the backfill soil 104 by using, for example, a compactor.

[0056] [Actions and Effects of the Construction Method of the Foundation Structure 100D According to the Fourth Embodiment] According to the construction method for the foundation structure 100D of this embodiment, the base portion 102 can be formed by placing a pair of support members 10B as a second formwork for forming the base portion 102 and pouring concrete between the pair of support members 10B. The second formwork used to form the base portion 102 can be used as the support members 10B. A gap C is formed between the third piece 13B of the support member 10B and the upper surface 102a of the base portion 102, so that backfill soil 104 is not placed between the upper surface 102a of the base portion 102 and the third piece 13B. By forming the gap C above the base portion 102 where no backfill soil 104 is placed, the amount of soil placed on the base portion 102 can be reduced.

[0057] Furthermore, the foundation structure 100D according to the fourth embodiment includes a buffer material 26 disposed between the upper surface 102a of the base portion 102 and the lower surface 13b of the third piece 13B. With this configuration of the foundation structure 100D, the buffer material 26 is disposed on the lower surface 13b of the third piece 13B, so that when concrete is poured, it is possible to prevent concrete from flowing into the area where the buffer material 26 is disposed. This allows a gap C to be formed between the lower surface 13b of the third piece 13B and the upper surface 102a of the base portion 102.

[0058] [Base structure 100E according to the fifth embodiment] Next, a construction method for a foundation structure 100E according to the fifth embodiment will be described. FIG. 8 is a process diagram showing the steps of the construction method for a foundation structure 100E according to the fifth embodiment. FIG. 9 is a cross-sectional view showing the continuous footing 101, support member 10, and formwork 25 of the foundation structure 100E according to the fifth embodiment. FIG. 10(a) is a perspective view showing the support member 10 before being bent, and FIG. 10(b) is a perspective view showing the support member 10 after being bent. In the description of the fifth embodiment, explanations that are the same as those of the first to fourth embodiments will be omitted. The foundation structure 100E according to the fifth embodiment shown in FIG. 9 has substantially the same configuration as the foundation structure 100B according to the second embodiment shown in FIG.

[0059] The construction method for the foundation structure 100E according to the fifth embodiment includes the steps of placing the formwork 25 for the rising portion 103 (step S11), placing the formwork (support member 10B) for the base portion 102 (step S12), pouring concrete inside the formwork 25 (step S13), removing the formwork 25 for the rising portion 103 (step S14), bending the formwork (support member 10B) for the base portion 102 (step S21), and backfilling with backfill soil 104 (step S15).

[0060] In the step of placing the molds 25 for the rising portions 103 (step S11), a pair of molds (first molds) 25 for forming the rising portions 103 are placed at predetermined positions.

[0061] In the process of placing a formwork for the base portion 102 (step S12), a pair of support members 10B before the third pieces 13B are bent are placed as a formwork (second formwork) for forming the base portion 102, and the first pieces 11 of the support members 10B are fixed to crushed stone 105 (or basal concrete). As shown in FIG. 10(a), in the support members 10B before the third pieces 13B are bent, the thickness direction of the second pieces 12 and the thickness direction of the third pieces 13B are the same. The first pieces 11 are bent relative to the second pieces 12. The fourth pieces 14 are bent relative to the third pieces 13B.

[0062] In the support member 10B, a plurality of slits 16 are formed between the second piece 12 and the third piece 13B. The plurality of slits 16 penetrate in the plate thickness direction. The plurality of slits 16 are aligned along the boundary between the second piece 12 and the third piece 13B. As shown in FIG. 10(b), the boundary between the second piece 12 and the third piece 13B is a corner portion when the third piece 13 is bent relative to the second piece 12.

[0063] In the step of pouring concrete inside the formwork (step S13), concrete is poured between the pair of formworks (first formworks) 25 and into the pair of support members (second formworks) 10B, thereby forming the rising portion 103 and the base portion 102.

[0064] In the step of removing formwork 25 of rising portion 103 (step S14), the pair of formwork 25 is removed after the concrete has hardened.

[0065] In the process (step S21) of bending the formwork (support member 10B) of the base portion 102, the support member 10B before bending shown in FIG. 10(a) is bent to form the support member 10B shown in FIG. 10(b). In step S21, the third piece 13B is bent relative to the second piece 12. The thickness direction of the third piece 13B is along the Z-axis direction. The support member 10B is easily bent because multiple slits 16 are formed in it.

[0066] In the step of backfilling the backfill soil 104 (step S15), the backfill soil 104 is backfilled into the area surrounded by the continuous footing 101. A worker compacts the backfill soil 104 by using, for example, a compactor.

[0067] [Actions and Effects of the Construction Method of the Foundation Structure 100E According to the Fifth Embodiment] According to the construction method for the foundation structure 100E of this embodiment, the base portion 102 can be formed by placing a pair of support members 10B before the third pieces 13B are bent as a second formwork for forming the base portion 102, and pouring concrete between the pair of support members 10B. The second formwork used to form the base portion 102 can be bent to form the third pieces 13B, which can then be used as the support members 10B. Gaps are formed between the support members 10B, the third pieces 13B, and the upper surface 102a of the base portion 102, preventing backfill soil 104 from being placed between the upper surface 102a of the base portion 102 and the third pieces 13B. By forming a gap C above the base portion 102 where no backfill soil 104 is placed, the amount of soil placed on the base portion 102 can be reduced.

[0068] [Foundation structure 100F according to the first modified example] Next, a foundation structure 100F according to a first modified example will be described. Fig. 11 is a cross-sectional view showing a support member 10F of the foundation structure 100F according to the first modified example. The foundation structure 100F according to the first modified example differs from the foundation structure 100B according to the second embodiment shown in Fig. 4 in that the foundation structure 100F according to the first modified example includes a support member 10F having a shape different from that of the support member 10B, instead of the support member 10B. Note that in the description of the first modified example, explanations similar to those of the above embodiment will be omitted.

[0069] The support member 10F has a first piece 11, a second piece 12, a third piece 13F, and a fourth piece 14. The third piece 13F includes a first portion 31 and a second portion 32. The first portion 31 and the second portion 32 are arranged side by side in the X-axis direction. The first portion 31 is arranged closer to the second piece 12, and the second portion 32 is arranged closer to the rising portion 103. The first portion 31 and the second portion 32 are plate-shaped, and the second portion 32 is bent with respect to the first portion 31.

[0070] The first portion 31 is disposed so as to be inclined with respect to the horizontal plane (XY plane) when viewed in the longitudinal direction (Y-axis direction) of the continuous footing 101. The end of the first portion 31 closer to the rising portion 103 is disposed higher than the end of the first portion 31 closer to the second piece 12.

[0071] The second portion 32 is disposed along a horizontal plane (XY plane) when viewed in the longitudinal direction (Y-axis direction) of the continuous foundation 101.

[0072] In this way, the third piece 13F may include a plurality of first portions 31 and second portions 32 that are different in thickness direction.

[0073] [Base structure 100G according to the second modified example] Next, a foundation structure 100G according to a second modified example will be described. FIG. 12 is a cross-sectional view showing a support member 10G of the foundation structure 100G according to the second modified example. The foundation structure 100G according to the second modified example differs from the foundation structure 100B according to the second embodiment shown in FIG. 4 in that the foundation structure 100G according to the second modified example includes a support member 10G having a shape different from that of the support member 10B, instead of the support member 10B. Note that in the description of the second modified example, explanations similar to those of the above embodiment and the first modified example will be omitted.

[0074] The support member 10G has a first piece 11, a second piece 12, a third piece 13G, and a fourth piece 14. The third piece 13G includes a first portion 31G and a second portion 32. The first portion 31G and the second portion 32 are arranged side by side in the X-axis direction. The first portion 31G is arranged closer to the second piece 12, and the second portion 32 is arranged closer to the rising portion 103. The first portion 31G and the second portion 32 are plate-shaped. The first portion 31G is formed so as to be curved when viewed in the Y-axis direction.

[0075] In this way, the third piece 13G may include a curved portion (first portion 31G).

[0076] It should be noted that the present invention is not limited to the configurations shown here, and other embodiments may be possible in which other components are combined with the configurations described in the above embodiments. In this regard, the present invention can be modified within the scope of the present invention, and can be appropriately determined depending on the application form.

[0077] In the construction method for the foundation structures 100F and 100G according to the embodiment, the order of the steps may be changed, or multiple steps may be performed in parallel. Furthermore, when constructing the foundation structure 100 according to the above embodiment, the above construction method may be used, or other construction methods may be applied.

[0078] In the base structure 100B according to the above embodiment, the fourth piece 14 is formed so as to protrude upward from the third piece 13B, but the fourth piece 14 may also be formed so as to protrude downward from the third piece 13B. [Explanation of symbols]

[0079] 100,100B,100C,100D,100E,100F,100G:Foundation structure 10, 10B, 10C, 10F, 10G: Support member 11: 1st piece 12: 2nd piece 13,13B,13C,13F,13G: 3rd piece 14: 4th piece 25: Formwork (first formwork) 101:Strip foundation 102: Base section 103: Rising section 104: Backfill soil 105: Crushed stone C: Gap X: X-axis direction (horizontal direction) Y: Y-axis direction (horizontal direction) Z: Z-axis direction (vertical direction)

Claims

1. a strip foundation having a base portion and a rising portion; a support member disposed adjacent to the base portion; backfill soil filled in the area surrounded by the strip foundation; The support member is A first piece is arranged so that the thickness direction of the plate is along the vertical direction and is fixed to crushed stone or concrete; a second piece bent from the first piece and extending upward to face a side surface of the base portion; a third piece bent from the second piece and extending in a direction approaching the rising portion, positioned above and spaced apart from the upper surface of the base portion, and covering the upper surface of the base portion;

2. The support member is The foundation structure according to claim 1 , further comprising a fourth piece bent from the third piece and extending in the vertical direction to abut against a side surface of the rising portion.

3. The foundation structure described in claim 1, wherein the third piece is arranged so as to be inclined when viewed in the longitudinal direction of the slab foundation, and the end closer to the side of the rising portion is arranged higher than the end closer to the second piece.

4. The foundation structure according to claim 1 , wherein the thickness direction of the third piece is arranged along the vertical direction.

5. The foundation structure according to claim 1 , wherein the third piece is formed so as to protrude on both sides of the second piece in the thickness direction when viewed in the longitudinal direction of the continuous footing.

6. The foundation structure of claim 1 , further comprising a cushioning material disposed between the upper surface of the base portion and the lower surface of the third piece.

7. a strip foundation having a base portion and a rising portion; a support member disposed adjacent to the base portion; backfill soil filled in the area surrounded by the strip foundation; The support member is A first piece is arranged so that the thickness direction of the plate is along the vertical direction and is fixed to crushed stone or concrete; a second piece bent from the first piece and extending upward to abut against a side surface of the base portion; a third piece bent from the second piece and extending in a direction approaching the rising portion, disposed above and spaced apart from the upper surface of the base portion, and covering the upper surface of the base portion, a step of placing a pair of first forms for forming the rising portion; A step of arranging a pair of the support members as a second formwork for forming the base portion and fixing the first pieces of the support members to crushed stone or mortar; Pouring concrete between the pair of first formworks and between the pair of second formworks; removing the pair of first formworks; and a step of backfilling the backfill soil within the area surrounded by the continuous footing.

8. a strip foundation having a base portion and a rising portion; a support member disposed adjacent to the base portion; backfill soil filled in the area surrounded by the strip foundation; The support member is A first piece is arranged so that the thickness direction of the plate is along the vertical direction and is fixed to crushed stone or concrete; a second piece bent from the first piece and extending upward to abut against a side surface of the base portion; a third piece bent from the second piece and extending in a direction approaching the rising portion, disposed above and spaced apart from the upper surface of the base portion, and covering the upper surface of the base portion, a step of placing a pair of first forms for forming the rising portion; A step of arranging a pair of the support members in a state before the third pieces are bent as a second formwork for forming the base portion, and fixing the first pieces of the support members to crushed stone or mortar; Pouring concrete between the pair of first formworks and between the pair of second formworks; removing the pair of first formworks; a step of bending the third piece of the support member, which is a pair of the second formwork frames, relative to the second piece and disposing it so as to cover an upper surface of the base portion; and a step of backfilling the backfill soil within the area surrounded by the continuous footing.

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