Foundation structure of building

Abstract

To reduce bar arrangement density and improve workability.SOLUTION: A reinforced-concrete foundation structure 1 applied to a building having an inclined exterior wall extending in a direction inclined with respect to an X direction in plan view includes: a first foundation column 31 and a second foundation column 32 arranged on an inclined exterior wall line LQ along the inclined exterior wall; a third foundation column 33 arranged on the inner side of the building relative to the first foundation column and the second foundation column; a first foundation girder 41 whose both ends are joined to the first foundation column and the third foundation column; a second foundation girder 42 whose both ends are joined to the second foundation column and the third foundation column; an inclined foundation beam 6 which is joined to the first foundation girder and the second foundation girder and extends in a direction inclined with respect to the X direction; and an inclined slab 7Q extending from the inclined foundation beam to the inclined external wall line.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present disclosure relates to foundation structures for buildings, and in particular to reinforced concrete foundation structures applied to buildings having sloping exterior walls. [Background technology]

[0002] A building, for example of a steel frame structure, is known that has an X exterior wall extending in the X direction in a plan view, a Y exterior wall extending in a Y direction perpendicular to the X direction, and an inclined exterior wall extending in a direction inclined with respect to the X and Y directions.

[0003] Such buildings are constructed on a foundation structure made of reinforced concrete and are supported from below by the foundation structure. The foundation structure has an outer periphery along the X exterior wall line along the X exterior wall, the Y exterior wall line along the Y exterior wall, and the inclined exterior wall line along the inclined exterior wall, and the outer periphery supports the X exterior wall, the Y exterior wall, and the inclined exterior wall. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2012-77531 A Summary of the Invention [Problem to be solved by the invention]

[0005] Generally, a first foundation pillar and a second foundation pillar are positioned on the inclined exterior wall line, and both ends of a inclined foundation girder along the inclined exterior wall line are joined to these first and second foundation pillars, so that the inclined exterior wall is supported by the inclined foundation girder.

[0006] However, for example, the first foundation column is connected not only to the inclined foundation girder, but also to the X foundation girder extending in the X direction and the Y foundation girder extending in the Y direction. Therefore, inside the first foundation column, the end of the girder main reinforcement of the X foundation girder, the end of the girder main reinforcement of the Y foundation girder, and the end of the girder main reinforcement of the inclined foundation girder cross each other closely or adjacently at different levels. Therefore, the reinforcing density inside the first foundation column increases, the workability deteriorates, and there is a risk that the concrete aggregate will not circulate sufficiently. The same problem occurs with the second foundation column.

[0007] The present disclosure has been devised in light of the above circumstances, and its purpose is to provide a foundation structure for a building that reduces the reinforcement density, improves workability, and maintains quality. [Means for solving the problem]

[0008] According to one aspect of the present disclosure, A reinforced concrete foundation structure applied to a building having an inclined exterior wall extending in a direction inclined with respect to the X direction in a plan view, A first foundation pillar and a second foundation pillar arranged on a sloping outer wall line along the sloping outer wall; A third foundation pillar disposed on the inside of the building relative to the first foundation pillar and the second foundation pillar; a first foundation girder, both ends of which are joined to the first foundation pillar and the third foundation pillar; a second foundation girder, both ends of which are joined to the second foundation pillar and the third foundation pillar; An inclined foundation sub-beam whose both ends are joined to both the first foundation girder and the second foundation girder, or whose one end is joined to one of them, and which extends in a direction inclined with respect to the X direction; A sloped slab extending from the sloped foundation beam to the sloped exterior wall line; The present invention provides a foundation structure for a building, comprising:

[0009] Preferably, the building has an X exterior wall extending in an X direction and a Y exterior wall extending in a Y direction perpendicular to the X direction, Both ends of the inclined outer wall are connected to the X outer wall and the Y outer wall, respectively; Both ends of the inclined outer wall line are connected to an X outer wall line along the X outer wall and a Y outer wall line along the Y outer wall, respectively.

[0010] Preferably, the inclined slab is formed in an area surrounded by the first foundation pillar, the first foundation girder, the inclined foundation sub-beam, the second foundation girder, the second foundation pillar and the inclined outer wall line.

[0011] Preferably, the inclined foundation joists extend parallel to the inclined exterior wall line.

[0012] Preferably, both ends of the inclined foundation girder are joined to intermediate portions of the first foundation girder and the second foundation girder, respectively.

[0013] Preferably, the substructure comprises a slab; The inclined slab forms a part of the slab, The inclined slab has the same reinforcement structure as the other parts of the slab.

[0014] Preferably, the slab and the inclined slab have a first upper end reinforcement and a second upper end reinforcement that are perpendicular to each other in a plan view at the upper end of the interior thereof, the first upper end reinforcement is arranged parallel to the X direction, and the second upper end reinforcement is arranged parallel to the Y direction; The slab and the inclined slab have, at their internal lower ends, first and second lower end reinforcing bars that are perpendicular to each other in a plan view, the first lower end reinforcing bars being arranged parallel to the X direction and the second lower end reinforcing bars being arranged parallel to the Y direction. Effect of the Invention

[0015] According to the present disclosure, the reinforcement density can be reduced to improve workability and maintain quality. [Brief description of the drawings]

[0016] [Figure 1] FIG. 2 is a schematic plan view showing a part of a base structure according to the present embodiment. [Diagram 2]FIG. 2 is a schematic plan view showing the internal structure of the base structure in a specific area. [Diagram 3] FIG. 3 is a schematic view showing a cross section taken along line III-III of FIG. [Figure 4] 3 is a detailed view showing the internal structure in cross section taken along line III-III in FIG. 2. [Diagram 5] This is a cross-sectional plan view showing the foundation pillar and its surrounding internal structure. [Figure 6] This is a plan view showing the internal structure of the joint between the inclined foundation beam and the first foundation beam. [Figure 7] 7 is a cross-sectional view taken along line VII-VII of FIG. 6, showing a longitudinal section of the inclined foundation beam. [Figure 8] FIG. 8 is a cross-sectional view taken along line VIII-VIII in FIG. [Figure 9] IX-IX cross-sectional view of FIG. 6. [Figure 10] XX cross-sectional view of FIG. 2. [Figure 11] FIG. 11 is a schematic plan view showing a first modified example. [Figure 12] FIG. 11 is a schematic plan view showing a second modified example. [Figure 13] FIG. 13 is a schematic plan view showing a third modified example. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0017] Hereinafter, embodiments of the present disclosure will be described with reference to the accompanying drawings. Note that the present disclosure is not limited to the following embodiments.

[0018] FIG. 1 is a schematic plan view showing a part of the basic structure according to the present embodiment. In the plan view shown in the figure, a horizontal XY plane including an X-axis and a Y-axis perpendicular to each other is defined. The direction parallel to the X-axis is called the X-direction, and the direction parallel to the Y-axis is called the Y-direction. In the figure, the right side is the +X direction, the left side is the -X direction, the upper side is the +Y direction, and the lower side is the -Y direction. The Z-axis is perpendicular to the X-axis and the Y-axis, and the direction parallel to the Z-axis is called the Z-direction, with the front side in the thickness direction of the paper surface of the figure being the +Z direction, and the back side being the -Z direction. The +Z direction is the vertical upper side, and the -Z direction is the vertical lower side. In this embodiment, the X-direction is the reference. In practice, the X-direction can be set to any direction from east to west to north to south.

[0019] The positions X1, X2, and X3 in the X direction and the positions Y1, Y2, Y3, and Y4 in the Y direction are defined as shown in the figure. For example, the position or coordinates of the position X1 in the X direction and the position Y1 in the Y direction are represented as (X1, Y1).

[0020] Although not shown, the building of this embodiment is a steel-framed building used as an office building, warehouse, factory, etc. The building has exterior walls, which include an X exterior wall extending in the X direction in a plan view, a Y exterior wall extending in the Y direction, and an inclined exterior wall whose both ends are connected to the X exterior wall and the Y exterior wall, respectively. Note that the exterior wall here means an outer wall. The exterior shape of the building in a plan view is the same as the exterior shape of the foundation structure 1 shown in FIG. 1, and the building has inclined exterior walls inclined with respect to the X and Y directions at the corners between the +X side of the X exterior wall and the +Y side of the Y exterior wall.

[0021] Correspondingly, an exterior wall line L as shown in FIG. 1 is defined. The exterior wall line L is a reference for installing the exterior wall of the building, and the exterior wall is installed along this exterior wall line L. The exterior wall line L has an X exterior wall line LX along the X exterior wall, a Y exterior wall line LY along the Y exterior wall, and an inclined exterior wall line LQ along the inclined exterior wall whose both ends are connected to the X exterior wall and the Y exterior wall, respectively. The inclined exterior wall line LQ extends in a direction inclined with respect to the X direction. The "direction inclined with respect to the X direction" refers to a direction inclined with respect to the X direction (particularly the +X direction) at an inclination angle θ1 that is greater than 0° and less than 180° and other than 90°. In this embodiment, the inclination angle θ1 is set to about 45°, but this value can be changed.

[0022] The foundation structure 1 has an outer peripheral edge portion 2 along the outer wall line L, and this outer peripheral edge portion 2 supports the outer wall of the building from below.

[0023] The foundation structure 1 has a number of rectangular areas divided into a grid pattern by positions X1 to X3 in the X direction and positions Y1 to Y4 in the Y direction. Foundation pillars 3 are provided at each grid point as appropriate. In particular, the foundation pillar 3 provided at the grid point located on the outermost side of the building among the grid points is called the outermost foundation pillar 3A. Here, "outside the building" generally means the +X side in the X direction and the +Y side in the Y direction in the illustrated example. In the illustrated example, the "outermost grid point of the building" refers to the grid points located at (X1, Y4), (X2, Y3), and (X3, Y1).

[0024] In addition, foundation pillars 3 (referred to as inner foundation pillars 3B) are also provided at grid points located inside the building from the outermost foundation pillars 3A. These grid points are the grid points located at (X1, Y3), (X1, Y2), and (X2, Y1). In the illustrated example, "inside the building" generally means the -X side in the X direction and the -Y side in the Y direction.

[0025] The foundation structure 1 has a plurality of foundation girders 4, both ends of which are joined to the foundation columns 3. In other words, a foundation beam whose both ends are joined to the foundation columns 3 is called a foundation girder 4. The foundation girders 4 include an X foundation girder 4X extending in the X direction and a Y foundation girder 4Y extending in the Y direction.

[0026] On the other hand, a foundation beam having only one end connected to the foundation column 3 and the other end connected to a beam, and a foundation beam having both ends connected to a beam are called a foundation sub-beam. The foundation structure 1 has a plurality of foundation sub-beams 5. The foundation sub-beams 5 include an X foundation sub-beam 5X extending in the X direction and a Y foundation sub-beam (not shown) extending in the Y direction.

[0027] The foundation structure 1 also has an inclined foundation beam 6. The inclined foundation beam 6 is a foundation beam that is joined at one or both ends to the foundation girder 4 and extends in a direction inclined with respect to the X direction. In this embodiment, a plurality (two) of inclined foundation beams 6 are provided.

[0028] The foundation structure 1 also has a slab 7 that is disposed between the foundation columns 3, the foundation girders 4, the foundation sub-beams 5 and the inclined foundation sub-beams 6 and joined to their upper ends.

[0029] This embodiment is characterized by the inclined foundation beam 6 and its surrounding area. Therefore, the explanation will be given with a particular focus on the specific area where the inclined foundation beam 6 is located, specifically, the area from X1 to X2 and from Y3 to Y4 (including its surrounding area). Note that the inclined foundation beam 6 is also located in another area from X2 to X3 and from Y1 to Y3, but the explanation of the specific area described above is applicable to this other area, so the explanation will be omitted.

[0030] Fig. 2 is a schematic plan view showing the internal structure of the foundation structure 1 in a specific area. Fig. 3 is a schematic view showing the III-III cross section of Fig. 2, and Fig. 4 is a detailed view showing the internal structure in the III-III cross section of Fig. 2. Fig. 5 is a cross-sectional plan view showing the internal structure of the foundation pillar 3 (the outermost foundation pillar 3A) at (X1, Y4) and its surrounding area.

[0031] 1 and 2, the foundation structure 1 comprises a first foundation pillar 31 and a second foundation pillar 32 located on the inclined outer wall line LQ, and a third foundation pillar 33 located inside the building from the first foundation pillar 31 and the second foundation pillar 32. The foundation structure 1 also comprises a first foundation girder 41 whose both ends are joined to the first foundation pillar 32 and the third foundation pillar 33, and a second foundation girder 42 whose both ends are joined to the second foundation pillar 32 and the third foundation pillar 33. The foundation structure 1 also comprises an inclined foundation girders 6 whose both ends are joined to the first foundation girders 31 and the second foundation girder 32 and extend in a direction inclined with respect to the X direction, and an inclined slab 7Q (shown by a dotted area) extending from the inclined foundation girders 6 to the inclined outer wall line LQ.

[0032] The first foundation pillar 31 is formed by the foundation pillar 3 (outermost foundation pillar 3A) at (X1, Y4). The second foundation pillar 32 is formed by the foundation pillar 3 (outermost foundation pillar 3A) at (X2, Y3). The third foundation pillar 33 is formed by the foundation pillar 3 (inner foundation pillar 3B) at (X1, Y3). The third foundation pillar 33 is in the same position as the first foundation pillar 31 in the X direction and in the same position as the second foundation pillar 32 in the Y direction.

[0033] The first foundation girder 41 is formed by a Y foundation girder 4Y whose both ends are joined to the foundation pillar 3 at (X1, Y4) and the foundation pillar 3 at (X1, Y3). The second foundation girder 42 is formed by an X foundation girder 4X whose both ends are joined to the foundation pillar 3 at (X2, Y3) and the foundation pillar 3 at (X1, Y3).

[0034] The first foundation pillar 31 is positioned at the end on the +Y side (or -X side) of the inclined outer wall line LQ, or at the intersection of the inclined outer wall line LQ and the X outer wall line LX. The second foundation pillar 32 is positioned at approximately the midpoint on the inclined outer wall line LQ. The corners on the +X side and +Y side of the first foundation pillar 31 and the second foundation pillar 32 are arranged to be in contact with the inclined outer wall line LQ.

[0035] As shown in Fig. 3, one end on the +X side of the X foundation girder 4X is joined to the first foundation pillar 31. In addition, one end on the +Y side of the Y foundation girder 4Y (first foundation girder 41) is joined to the first foundation pillar 31. The X foundation girder 4X and the Y foundation girder 4Y have a vertically elongated rectangular cross-sectional shape as shown in Fig. 3, and their widths in the horizontal direction are smaller than the width of the first foundation pillar 31.

[0036] A slab 7 forming a floor plate is joined to the upper ends of the first foundation pillar 31, the X foundation girder 4X, and the Y foundation girder 4Y. The dimension (thickness) of the slab 7 in the Z direction is smaller than the dimension (height) of the X foundation girder 4X and the Y foundation girder 4Y. The heights of the upper end faces (top ends) of the X foundation girder 4X, the Y foundation girder 4Y, and the slab 7 are made equal, and they are flush with each other to form a common foundation floor surface 14.

[0037] A plurality of anchor bolts 8 protrude upward from the first foundation pillar 31. These anchor bolts 8 are used to fix the steel column 9 of the building onto the first foundation pillar 31. A plurality of anchor bolt holes 11 are provided in the base plate 10. The base plate 10 is installed on the upper end surface of the first foundation pillar 31. At this time, each anchor bolt 8 is inserted into each anchor bolt hole 11. Double nuts 13 are tightened onto each anchor bolt 8 protruding above the base plate 10, and the steel column 9 is fixed onto the first foundation pillar 31.

[0038] Reference numeral 12 denotes a first top mortar (so-called manju) that is sandwiched between the first foundation pillar 31 and the base plate 10 during construction. After the base plate 10 is temporarily fixed and the first top mortar 12 hardens, the gap between the first foundation pillar 31 and the base plate 10 on the outside of the first top mortar 12 is filled with a second top mortar (not shown) made of non-shrink mortar. The first top mortar 12 and the second top mortar form a top mortar as an intermediate member.

[0039] The method of fixing the steel column 9 is the same as that for the other foundation columns 3. The upper end surface of the foundation column 3 is set to the same height as the foundation floor surface 14.

[0040] In the example of FIG. 3, the portion of the slab 7 on the +X side of the first foundation pillar 31 forms an inclined slab 7Q.

[0041] As shown in Figures 4 and 5, the first foundation pillar 31, the X foundation girder 4X, the Y foundation girder 4Y (first foundation girder 41), and the slab 7 are all made of reinforced concrete, and are formed by assembling a framework with multiple reinforcing bars, surrounding the framework with a formwork, and pouring concrete into the formwork. Note that this is not the only option, and all of the foundation pillars 3, foundation girders 4, and foundation sub-beams 5, as well as the inclined foundation sub-beams 6, are made of reinforced concrete.

[0042] The first foundation pillar 31 is erected on a foundation footing (not shown) and has a quadrilateral (specifically, square) shape in plan view. It may have other shapes such as a circle. Inside the first foundation pillar 31, there are a plurality of column main reinforcements 15 arranged in parallel on the outer periphery in plan view and extending in the Z direction, a plurality of hoop reinforcements 15A (only one is shown) extending in a horizontal direction perpendicular to the column main reinforcements 15 and wound around the plurality of column main reinforcements 15, and a plurality of anchor bolts 8 arranged in parallel inside the area surrounded by the plurality of column main reinforcements 15 and extending in the Z direction.

[0043] The Y foundation girder 4Y (first foundation girder 41) has, inside, a plurality of upper end girder main reinforcements 16 arranged in parallel at its upper end and extending in the Y direction, a plurality of lower end girder main reinforcements 17 arranged in parallel at its lower end and extending in the Y direction, a pair of abdominal reinforcements 18 arranged at an intermediate height between the upper end girder main reinforcements 16 and the lower end girder main reinforcements 17 and at both ends of the width direction (X direction) of the Y foundation girder 4Y, and a plurality of stirrups 19 extending in a direction perpendicular to the Y direction and wrapped around the plurality of upper end girder main reinforcements 16, lower end girder main reinforcements 17 and abdominal reinforcements 18.

[0044] The X foundation girder 4X has a similar structure, except that the direction is different by 90°. Figure 5 shows a plurality of upper end girder main reinforcements 20 and stirrups 21 of the X foundation girder 4X.

[0045] The +Y side ends of the upper end girder main reinforcement 16 and the lower end girder main reinforcement 17 of the Y foundation girder 4Y and the +X side ends of the upper end girder main reinforcement 20 and the lower end girder main reinforcement of the X foundation girder 4X are embedded in the first foundation pillar 31 for a predetermined anchorage length. The anchorage length is, for example, 3 / 4 or more of the width of the first foundation pillar 31 in the longitudinal direction of each main reinforcement in a plan view. Note that to ensure the anchorage length, the ends of each main reinforcement may be bent into an L-shape, a U-shape, or other shape.

[0046] In this way, inside the first foundation column 31, many rebars and multiple anchor bolts 8 are intertwined. Therefore, workability is not necessarily good. Inside the first foundation column 31, the upper end girder main reinforcement 16 of the Y foundation girder 4Y and the upper end girder main reinforcement 20 of the X foundation girder 4X intersect closely or adjacently at different levels. The same is true for the lower end girder main reinforcement 17 of the Y foundation girder 4Y and the lower end girder main reinforcement of the X foundation girder 4X.

[0047] As shown in Figures 2 and 4, the slab 7 has, at its internal upper end, first upper end reinforcement 22 and second upper end reinforcement 23 which are perpendicular to each other in a plan view. The first upper end reinforcement 22 is positioned parallel to the X direction, and the second upper end reinforcement 23 is positioned parallel to the Y direction. The first upper end reinforcement 22 is positioned close to or adjacent to the upper side of the second upper end reinforcement 23. Note that this hierarchical relationship may be reversed.

[0048] Furthermore, the slab 7 has, at its inner lower end, first bottom end reinforcing bars 24 and second bottom end reinforcing bars 25 which are perpendicular to each other in a plan view. The first bottom end reinforcing bars 24 are positioned parallel to the X direction, and the second bottom end reinforcing bars 25 are positioned parallel to the Y direction. The pair of first bottom end reinforcing bars 24 and second bottom end reinforcing bars 25 is arranged so as to be symmetrical up and down with the pair of first upper end reinforcing bars 22 and second upper end reinforcing bars 23. Therefore, the first bottom end reinforcing bars 24 are positioned close to or adjacent to the lower part of the second bottom end reinforcing bars 25.

[0049] In particular, the reinforcement in the slab 7 is the same or common to the inclined slab 7Q. The inclined slab 7Q of this embodiment has the same or common reinforcement structure as the other parts of the slab 7. This eliminates the need to arrange reinforcement differently for the inclined slab 7Q and the other parts of the slab 7 individually, as will be described in detail later, and greatly improves workability.

[0050] In this embodiment, the pair of the first upper end reinforcement 22 and the second upper end reinforcement 23 of the slab 7 is located close to the upper end girder main reinforcement 16 of the Y foundation girder 4Y and the upper end girder main reinforcement 20 of the X foundation girder 4X (+Z side). Also, the pair of the first lower end reinforcement 24 and the second lower end reinforcement 25 of the slab 7 is located close to the lower end girder main reinforcement 16 of the Y foundation girder 4Y and the upper end girder main reinforcement 20 of the X foundation girder 4X (-Z side).

[0051] Although detailed illustration and explanation are omitted, the second foundation pillar 32 and the third foundation pillar 33 also have a structure similar to that of the first foundation pillar 31.

[0052] The inclined slab 7Q is formed in an area surrounded by the first foundation pillar 31, the first foundation girder 41, the inclined foundation sub-beam 6, the second foundation girder 42, the second foundation pillar 32, and the inclined outer wall line LQ. The inclined slab 7Q forms a part of the slab 7.

[0053] Next, the inclined foundation beam 6 and the inclined slab 7Q will be described in more detail. Fig. 6 is a plan view showing the internal structure of the joint between the inclined foundation beam 6 and the first foundation girder 41. For convenience, the slab 7 is omitted.

[0054] 1, 2, and 6, both ends of the inclined foundation girder 6 are joined to the middle parts of the first foundation girder 41 and the second foundation girder 42, respectively. The inclined foundation girder 6 extends in a direction inclined with respect to the X direction, and in this embodiment, extends parallel to the inclined outer wall line LQ. Therefore, the inclination angle θ2 of the inclined foundation girder 6 with respect to the X direction is equal to the inclination angle θ1 of the inclined outer wall line LQ.

[0055] Fig. 7 is a cross-sectional view taken along line VII-VII in Fig. 6, showing the longitudinal section of the inclined foundation beam 6. For convenience, the slab 7 is omitted. As shown in the figure, the inclined foundation beam 6 has a structure similar to that of the foundation beam 4. The inclined foundation beam 6 also has a vertically long rectangular cross-sectional shape. However, the height dimension of the inclined foundation beam 6 is smaller than that of the foundation beam 4.

[0056] The inclined foundation beam 6 has, inside, a number of upper end beam main bars 26 arranged in parallel at the upper end and extending in the longitudinal or axial direction of the inclined foundation beam 6 (referred to as the beam axis direction), a number of lower end beam main bars 27 arranged in parallel at the lower end and extending in the beam axis direction, a pair of abdominal bars 28 arranged at an intermediate height between the upper end beam main bars 26 and the lower end beam main bars 27 and at both ends of the inclined foundation beam 6 in the width direction (left and right direction in the figure), and a number of stirrups 29 extending in a direction perpendicular to the beam axis direction and wrapped around the upper end beam main bars 26, the lower end beam main bars 27 and the abdominal bars 28.

[0057] Fig. 8 is a cross-sectional view taken along line VIII-VIII in Fig. 6, showing a longitudinal section at the start of the joint of the inclined foundation beam 6 to the first foundation girder 41. Fig. 9 is a cross-sectional view taken along line IX-IX in Fig. 6, showing a longitudinal section along the beam axis direction at the joint between the first foundation girder 41 and the inclined foundation beam 6. In Figs. 6, 8 and 9, the imaginary line a indicates the boundary between the first foundation girder 41 and the inclined foundation beam 6. For convenience, the slab 7 is omitted.

[0058] As shown in Figures 6 and 9, the ends of the upper end beam main reinforcement 26 and the lower end beam main reinforcement 27 of the inclined foundation beam 6 are embedded in the first foundation girder 41 for a predetermined anchorage length. The anchorage length here is, for example, the length to a position beyond the center CB of the width B of the first foundation girder 41. This ensures a sufficient anchorage length.

[0059] 9, the height dimension in the Z direction of the inclined foundation beam 6 is smaller than the height dimension of the first foundation girder 41, and the upper end surface (top end) of the inclined foundation beam 6 is positioned at the same height as the upper end surface (top end) of the first foundation girder 41, forming part of the aforementioned foundation floor surface 14. In other words, the upper end surfaces (top ends) of the inclined foundation beam 6 and the first foundation girder 41 are arranged flush with each other.

[0060] The upper end beam main reinforcement 26 of the inclined foundation beam 6 is arranged close to and below the upper end beam main reinforcement 16 of the first foundation girder 41. On the other hand, the lower end beam main reinforcement 27 of the inclined foundation beam 6 is arranged relatively far above the lower end beam main reinforcement 17 of the first foundation girder 41.

[0061] As shown in Fig. 8, among the stirrups 29 of the inclined foundation girder 6, at least a part (part or all) of which is embedded or fixed in the first foundation girder 41 is not formed in a normal loop shape that goes around once, but is formed in a U-shape with the end on the first foundation girder 41 side being open. This improves the workability of the stirrups 29 compared to the case of a loop shape. That is, since it is only necessary to insert the stirrups 29 from the side, the arrangement of the stirrups 29 can be made easier. In addition, the stirrups 29 can be embedded deep inside the first foundation girder 41 in the width B direction of the first foundation girder 41, and the fixing length can be secured.

[0062] As shown in Figure 9, the end of the upper end sub-beam main reinforcement 26 embedded in the first foundation girder 41 is bent downward in an L-shape to form a 90° hook. This allows the anchorage length to be increased compared to when this is not done. The end of the lower end sub-beam main reinforcement 27 is not processed in this way and remains straight.

[0063] Regarding the processing for securing the anchorage length, the end of the upper end beam reinforcing bar 26 may be bent in a different shape (e.g., U-shape, etc.), and the end of the lower end beam reinforcing bar 27 may be similarly processed.

[0064] Although detailed explanation is omitted, the joint between the second foundation girder 42 and the inclined foundation beam 6 has a similar structure to the joint between the first foundation girder 41 and the inclined foundation beam 6 .

[0065] Next, the structure of the joint between the inclined foundation beam 6 and the slab 7, particularly the inclined slab 7Q, will be described.

[0066] FIG. 10 is a cross-sectional view taken along line XX in FIG. 2, showing a longitudinal section along the X direction at the joint between the inclined foundation beam 6 and the slab 7 (including the inclined slab 7Q).

[0067] As mentioned above, the reinforcement of the inclined slab 7Q is the same or common to the reinforcement of other slabs 7, especially the slab 7 (indicated by symbol 7P) located next to the inclined slab 7Q on the inside of the building. Therefore, the slab 7 and the inclined slab 7Q have the same or common first upper end reinforcement 22 and second upper end reinforcement 23, and the same or common first lower end reinforcement 24 and second lower end reinforcement 25. The first upper end reinforcement 22 and second upper end reinforcement 23, and the first lower end reinforcement 24 and second lower end reinforcement 25 pass through the inclined foundation joist 6 and extend across the inclined slab 7Q and the adjacent slab 7P. If the diameter of the first reinforcement 22 is different between the slab 7P and the inclined slab 7Q, it is arranged continuously by performing lap joints or the like on the inclined foundation joist 6. The same applies to the second upper end reinforcement 23.

[0068] The first upper end reinforcement 22 and the second upper end reinforcement 23 are arranged above the upper end beam main reinforcement 26 of the inclined foundation beam 6. As shown in FIG. 4, the first upper end reinforcement 22 and the second upper end reinforcement 23 are arranged above the upper end beam main reinforcement 16 of the first foundation girder 41 and the second foundation girder 42.

[0069] The first bottom end reinforcement 24 and the second bottom end reinforcement 25 are arranged below the upper end sub-beam main reinforcement 26 of the inclined foundation sub-beam 6. As shown in FIG. 4, the first bottom end reinforcement 24 and the second bottom end reinforcement 25 are arranged below the upper end sub-beam main reinforcement 16 of the first foundation girder 41 and the second foundation girder 42.

[0070] As shown in Fig. 10, the first upper end reinforcement 22 and the first lower end reinforcement 24 extending in the X direction extend to just before the tip surface 30 of the inclined slab 7Q located on the inclined outer wall line LQ. In this embodiment, in order to increase the anchorage length, the tip of the first upper end reinforcement 22 is bent downward in an L-shape to form a 90° hook. As in the above, the tip of the first upper end reinforcement 22 may be bent in a different shape (e.g., U-shape, etc.), and the tip of the lower end beam main reinforcement 27 may be bent.

[0071] Although not shown, the second upper end reinforcement 23 and the second lower end reinforcement 25 extending in the Y direction also extend to just before the tip surface 30 of the inclined slab 7Q. This can be easily understood by imagining a cross-sectional view (cross-sectional view along the Y direction) in which the orientation of the cross-sectional view in Fig. 10 (cross-sectional view along the X direction) is changed by 90°.

[0072] The portion of the inclined slab 7Q near the tip surface 30, i.e., the tip portion 31, forms part of the outer peripheral edge portion 2 of the foundation structure 1 described above, and supports the inclined outer wall of the building from below.

[0073] As shown in Fig. 2, the reinforcement of the slab 7 is formed in substantially all areas except for the foundation columns 3, which have a high reinforcement density. Therefore, the reinforcement of the slab 7 is also provided in the foundation girders 4, the foundation sub-girders 5, and the inclined foundation sub-girders 6. However, in order to avoid excessive overlap, the reinforcement of the slab 7 in the same direction as the main reinforcement of the foundation girders 4 and the foundation sub-girders 5 is omitted.

[0074] From the cross-sectional view of Figure 10, the inclined slab 7Q looks like a cantilever slab. Therefore, in structural calculations, the inclined slab 7Q can be treated as a cantilever slab.

[0075] 2, the inclined slab 7Q is also joined to the first foundation girder 41 and the first foundation pillar 31 located on the +Y side of the inclined foundation beam 6, and to the second foundation girder 42 and the second foundation pillar 32 located on the +X side of the inclined foundation beam 6. From this point of view, the inclined slab 7Q can be considered as a three-way fixed slab that is joined to other parts in the X direction, the Y direction, and along the longitudinal direction of the inclined foundation beam 6, so either may be adopted.

[0076] The load of the inclined slab 7Q is transmitted mainly through the inclined foundation beam 6 to the first foundation girder 41 and the first foundation column 31.

[0077] The above explanation also applies to the other areas X2-X3 and Y1-Y3 shown in Figure 1. In these other areas, the first foundation pillar is formed by the foundation pillar 3 (outermost foundation pillar 3A) at (X2, Y3). The second foundation pillar is formed by the foundation pillar 3 (outermost foundation pillar 3A) at (X3, Y1). The third foundation pillar is formed by the foundation pillar 3 (inner foundation pillar 3B) at (X2, Y1).

[0078] The first foundation girder is formed by a Y foundation girder 4Y, both ends of which are joined to the foundation pillars 3 at (X2, Y3) and (X2, Y1). The second foundation girder is formed by an X foundation girder 4X, both ends of which are joined to the foundation pillars 3 at (X3, Y1) and (X2, Y1).

[0079] An inclined foundation beam 6 is provided, both ends of which are joined to the first foundation girder and the second foundation girder, and an inclined slab 7Q is provided, which extends from the inclined foundation beam 6 to the inclined outer wall line LQ.

[0080] The foundation structure 1 of this embodiment is mostly buried in the ground, except for a portion extending from the foundation floor surface 14 to a predetermined distance below.

[0081] Next, the advantages of this embodiment will be described.

[0082] As mentioned above, when attempting to provide a part in the foundation structure to support the inclined exterior wall, it is common to join both ends of the inclined foundation girder to the first and second foundation pillars on the inclined exterior wall line and have the inclined foundation girder support the inclined exterior wall.

[0083] However, if this is done, the ends of the main reinforcement bars of the three main girder beams, the X foundation girder, the Y foundation girder, and the inclined foundation girder, will cross the first foundation column at different levels. Moreover, the first foundation column originally contains multiple column main reinforcement bars, multiple hoop reinforcement bars, and multiple anchor bolts, which are its own parts, and in some cases anchor frames and pile anchorage bars may also be present. This increases the reinforcing bar density inside the first foundation column, which may worsen workability. The same problem exists with the second foundation column. If the reinforcing bar density increases, there is also a risk of cavities being created that the concrete cannot flow into.

[0084] In addition, when trying to secure the anchorage length of the main girder reinforcement of the inclined foundation girder, a relatively large gap is created between the main girder reinforcement and the inclined exterior wall line, so in order to fill the gap, additional concrete is sometimes poured into the inclined foundation girder. However, pouring additional concrete in this way increases the concrete volume unnecessarily. In addition, since the additional concrete is not included in the structural calculations, there is a risk that additional stress will be applied to the concrete.

[0085] Therefore, in this embodiment, instead of the inclined foundation girder, a inclined foundation minor beam 6 is provided located further inside the building, and a tilted slab 7Q is provided between the inclined foundation minor beam 6 and the inclined exterior wall line LQ.

[0086] Since the inclined foundation girders 6 are connected to the first foundation girder 41 and the second foundation girder 42, it is not necessary to connect the inclined foundation girders 6 to the first foundation column 31 and the second foundation column 32, which are originally high in reinforcing bar density, and it is not necessary to insert the upper end reinforcing bar 26 of the inclined foundation girders 6. That is, as shown in Figs. 6 and 8, for example, inside the first foundation girder 41, the upper end reinforcing bar 16 of the first foundation girder 41 and the upper end reinforcing bar 26 of the inclined foundation girders 6 intersect at a close level (height). Therefore, the number of reinforcing bars that intersect closely can be reduced to two, which reduces the reinforcing bar density.

[0087] If the reinforcing bar density is reduced, the arrangement and construction of each main bar becomes easier. This improves workability and maintains quality. The same can be said for the connection between the inclined foundation beam 6 and the second foundation beam 42.

[0088] As for the bottom reinforcement, in the general example described above, the bottom end girder main reinforcement of the three girder crosses at a close level. However, in this embodiment, the first foundation girder 41 and the second foundation girder 42, which are the main beams, are joined to the inclined foundation sub-beam 6, which is the sub-beam. Therefore, the bottom end girder main reinforcement 17 of the first foundation girder 41 and the second foundation girder 42 and the bottom end sub-beam main reinforcement 27 of the inclined foundation sub-beam 6 can be at different levels, which reduces the reinforcing density and improves workability.

[0089] In this embodiment, the inclined foundation beam 6 is joined to the middle part of the first foundation girder 41 and the second foundation girder 42. The middle parts of the first foundation girder 41 and the second foundation girder 42 tend to have a lower original reinforcement density than their ends. Therefore, in this embodiment, the inclined foundation beam 6 can be joined to a suitable location where the original reinforcement density is lower, which is advantageous for reducing the reinforcement density and improving workability.

[0090] The inclined foundation beam 6 bears a small proportion of the horizontal force because it is not the foundation beam 4. Therefore, as in this embodiment, the height (Z direction) dimension can be made smaller than that of the foundation beam 4, and construction costs can be reduced.

[0091] In addition, when pouring additional concrete as described above, additional reinforcement bars may be provided, but in this embodiment, such additional reinforcement bars can be omitted.

[0092] On the other hand, by providing a sloped slab 7Q extending from the sloped foundation beam 6 to the sloped exterior wall line LQ, a portion of the outer peripheral edge 2 of the foundation structure 1 is formed by the sloped slab 7Q, thereby enabling the sloped exterior wall of the building to be supported without any problems.

[0093] In this embodiment, the inclined slab 7Q has the same or common reinforcement structure as the other slabs 7 (particularly the adjacent slab 7P). Therefore, workability can be improved and the reinforcement density can be reduced compared to the case where a dedicated reinforcement structure is provided for the inclined slab 7Q.

[0094] This point will be explained in detail below. Fig. 11 shows a first modified example of the present disclosure, and is a schematic plan view showing the structure of the joint between the inclined slab 7Q and the adjacent slab 7P and the inclined foundation beam 6. Note that the same parts as those in the basic embodiment are given the same reference numerals in the drawing, and the explanation will be omitted.

[0095] In this first modified example, the inclined slab 7QX has a first upper end reinforcement 22X and a second upper end reinforcement 23X that are perpendicular to each other. The first upper end reinforcement 22X is positioned parallel to the longitudinal direction of the inclined foundation beam 6, and the second upper end reinforcement 23X is positioned perpendicular to the longitudinal direction of the inclined foundation beam 6.

[0096] Generally, in a cantilever slab, upper end reinforcement (i.e., upper end main reinforcement) that extends in the protruding direction of the cantilever slab and upper end reinforcement (i.e., distribution reinforcement) that extends in a direction perpendicular to the protruding direction of the cantilever slab are provided, and the upper end main reinforcement bears substantially all of the load. The first modified example follows this general example and has a second upper end reinforcement 23X that functions like an upper end main reinforcement and a first upper end reinforcement 22X that functions like a distribution reinforcement.

[0097] Although not shown, the inclined slab 7QX has a first bottom end bar and a second bottom end bar that are perpendicular to each other. The first bottom end bar is positioned parallel to the longitudinal direction of the inclined foundation beam 6, and the second bottom end bar is positioned perpendicular to the longitudinal direction of the inclined foundation beam 6.

[0098] In the case of the first modified example, inside the inclined foundation joist 6, the upper end joist main reinforcement 26 of the inclined foundation joist 6 intersects with the set of the first upper end reinforcement 22 and the second upper end reinforcement 23 of the adjacent slab 7P, and the set of the first upper end reinforcement 22X and the second upper end reinforcement 23X of the inclined slab 7QX. Therefore, the number of types of intersecting reinforcement increases compared to the basic embodiment, the reinforcement density increases, and the workability deteriorates. Furthermore, there is a risk that the covering thickness of the uppermost and lowermost reinforcing bars and the spacing between the upper and lower end reinforcements required for strength cannot be secured.

[0099] According to the basic embodiment, the number of types of intersecting reinforcement can be reduced compared to the first modified example, so that the reinforcement density can be reduced and workability can be improved.

[0100] Furthermore, inside the inclined foundation joist 6 of the first modified example, the set of the first bottom end reinforcement 24 and the second bottom end reinforcement 25 of the adjacent slab 7P intersects with the set of the first bottom end reinforcement and the second bottom end reinforcement of the inclined slab 7QX. Since there was no such intersection in the basic embodiment, the first modified example has a higher reinforcement density than the basic embodiment, and workability is deteriorated. Conversely, since there is no such intersection in the basic embodiment, the reinforcement density can be reduced, and workability can be improved.

[0101] Note that this first modified example is also one type of embodiment of the present disclosure, and can be implemented if circumstances permit.

[0102] Next, a second modified example of the present disclosure will be described.

[0103] As shown in Fig. 12, in the second modified example, there is no Y foundation girder 4Y at least in the illustrated part of the building, and there is no Y exterior wall or Y exterior wall line LY along it. Therefore, the end of the +X side of the building is triangular in plan view. Even with this structure, it is possible to provide a sloping foundation beam 6 and a sloping slab 7Q as shown in the figure.

[0104] 13, in the third modified example, only one end of the inclined foundation beam 6 is joined to the foundation girder 4. In the illustrated example, one end of the inclined foundation beam 6 on the -Y side is joined to the X foundation girder 4X, i.e., the second foundation girder 42, as in the basic embodiment, but the other end of the inclined foundation beam 6 on the +Y side is joined to the foundation pillar 3, i.e., the first foundation pillar 31.

[0105] In this way, although the benefit is lost at the joint with the first foundation pillar 31, the benefit is still there at the joint with the second foundation girder 42, so this type of modification is also effective.

[0106] In this modification, the inclined foundation beam 6 is not parallel to the inclined outer wall line LQ. Alternatively, one end of the inclined foundation beam 6 on the +Y side may be joined to the first foundation girder 41, and the other end of the inclined foundation beam 6 on the -Y side may be joined to the second foundation column 32.

[0107] Although the embodiment of the present disclosure has been described in detail above, various other embodiments and modifications of the present disclosure are possible.

[0108] For example, even when both ends of the inclined foundation girders 6 are joined to the first foundation girder 41 and the second foundation girder 42, the inclined foundation girders 6 may be made non-parallel to the inclined outer wall line LQ.

[0109] As long as the foundation structure 1 of the building is a reinforced concrete structure, the building may be of a structure other than a steel frame construction, for example, a wooden construction.

[0110] The configurations of the above-mentioned embodiments and the modified examples can be combined in part or in whole, unless there is a particular contradiction. The embodiments of the present disclosure are not limited to the above-mentioned embodiments, and all modifications, applications, and equivalents encompassed within the concept of the present disclosure as defined by the claims are included in the present disclosure. Therefore, the present disclosure should not be interpreted as being limited, and can be applied to any other technology that falls within the scope of the concept of the present disclosure. [Explanation of symbols]

[0111] 1 Basic structure 6 Slanted foundation beam 7. Slab 7Q Inclined slab 22 1st upper end reinforcement 23 2nd upper end reinforcement 24 1st bottom reinforcement 25 2nd bottom reinforcement 31 First Pillar 32 The Second Foundation Pillar 33 The Third Pillar 41 1st foundation girder 42 Second foundation girder LX X exterior wall line LY Y exterior wall line LQ Sloped exterior wall line

Claims

1. A reinforced concrete foundation structure applied to a building having an inclined exterior wall extending in a direction inclined with respect to the X direction in a plan view, a first foundation pillar and a second foundation pillar arranged on a sloped outer wall line along the sloped outer wall; a third foundation pillar disposed inside the building relative to the first foundation pillar and the second foundation pillar; a first foundation girder whose both ends are joined to the first foundation pillar and the third foundation pillar; a second foundation girder whose both ends are joined to the second foundation pillar and the third foundation pillar; an inclined foundation sub-beam whose both ends are joined to both the first foundation girder and the second foundation girder, or whose one end is joined to one of the first foundation girder and the second foundation girder, and which extends in a direction inclined with respect to the X direction; A sloped slab extending from the sloped foundation beam to the sloped exterior wall line; A foundation structure of a building characterized by comprising:

2. The building has an X exterior wall extending in an X direction and a Y exterior wall extending in a Y direction perpendicular to the X direction, Both ends of the inclined outer wall are connected to the X outer wall and the Y outer wall, respectively; Both ends of the inclined outer wall line are connected to an X outer wall line along the X outer wall and a Y outer wall line along the Y outer wall, respectively. The building foundation structure according to claim 1.

3. The inclined slab is formed in an area surrounded by the first foundation pillar, the first foundation girder, the inclined foundation sub-beam, the second foundation girder, the second foundation pillar, and the inclined outer wall line. The building foundation structure according to claim 1.

4. The inclined foundation beam extends parallel to the inclined outer wall line. The building foundation structure according to claim 1.

5. Both ends of the inclined foundation beam are respectively connected to the middle parts of the first foundation girder and the second foundation girder. The building foundation structure according to claim 1.

6. the foundation structure comprises a slab; The tilted slab forms part of the slab, The inclined slab has the same reinforcement structure as the other slabs. The building foundation structure according to claim 1.

7. The slab and the inclined slab have, at their internal upper ends, first upper end reinforcements and second upper end reinforcements that are perpendicular to each other in a plan view, the first upper end reinforcements are arranged parallel to the X direction, and the second upper end reinforcements are arranged parallel to the Y direction, The slab and the inclined slab have, at their lower ends inside thereof, first bottom reinforcement bars and second bottom reinforcement bars that are perpendicular to each other in a plan view, the first bottom reinforcement bars being arranged parallel to the X direction, and the second bottom reinforcement bars being arranged parallel to the Y direction. The foundation structure of claim 6.

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