Foundation structure and construction method thereof, structure and construction method thereof, and shed structure and construction method thereof

Abstract

To provide a foundation structure buried in an installation place and constructible with high workability, and its construction method, and a shed structure and its construction method.SOLUTION: A foundation structure 10 in a shed structure 1 including a roof material and a column member 2 includes a body precast member 20 for mounting and supporting the column member 2 on an upper surface, and a plurality of widened precast members 30 for widening the body precast member 20. The joints 60 formed at predetermined intervals between the main precast members 20 and the widened precast members 30 and between the widened precast members 30 are characterized in that the closing rebars 22,32 protruding from the side surfaces 21,31 are alternately arranged, and the auxiliary rebars 61 arranged inside the closing rebars 22,32 and the grout cured bodies 62 including the closing rebars 22,32 are provided.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a foundation structure and a construction method thereof for a structure such as a shed structure having a roof material and a support member, a structure and a construction method thereof, and a shed structure and a construction method thereof. [Background technology]

[0002] BACKGROUND ART As for the foundation structure of a structure such as a station shed, which is provided with a roof material and support members, there is a structure using precast members, as proposed in Patent Document 1, for example. The size and strength of such foundation structures made of precast members are determined by the structure of the roofing material, support members, etc. Therefore, when the precast members become large, they have to be constructed using heavy machinery.

[0003] However, there are cases where construction using heavy machinery is difficult, such as construction on station buildings that are already in service. Furthermore, when burying the foundation structure at the installation site, the precast members are placed on the excavated floor, which places a heavy burden on on-site workers and is not a construction method that is highly workable. Therefore, a foundation structure and a construction method therefor that are more workable have been desired. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 07-062674 Summary of the Invention [Problem to be solved by the invention]

[0005] In view of the above-mentioned problems, the present invention aims to provide a foundation structure and a construction method thereof that can be buried in the installation location and constructed with high workability, a structure and a construction method thereof, and a shed structure and a construction method thereof. [Means for solving the problem]

[0006] This invention relates to a foundation structure for a shed structure that includes roofing materials and support members, and includes a support main body portion that supports the load of the structure by attaching the support members to its upper surface, and an expansion portion that expands the support main body portion and is buried in an installation location, the support main body portion being a main precast member that is a block-shaped precast reinforced concrete member, the expansion portion being a block-shaped precast reinforced concrete member that is arranged around the support main body portion and is composed of a plurality of expansion precast members that are buried in the installation location, and the mutually opposing surfaces of the main precast member and the expansion precast member, and the expansion precast member Each of the opposing surfaces of the members has a closing protruding reinforcing bar that protrudes toward the other and is closed, and joints are formed at predetermined intervals between the main precast member and the widening precast member, and between the widening precast members, and the joints are characterized in that the closing protruding reinforcing bars protruding from each of the opposing surfaces are arranged alternately along a longitudinal direction perpendicular to the opposing direction, and the joints are provided with auxiliary reinforcing bars along the longitudinal direction that are arranged inside the closing protruding reinforcing bars arranged alternately along the longitudinal direction, and a joint hardening material that is filled between the opposing surfaces and hardened so as to contain the closing protruding reinforcing bars.

[0007] The present invention also provides a method for constructing a structure using a support structure, the method comprising: a support body having a support member attached to an upper surface thereof to support the load of the structure; and an expanded section which expands the support body and is buried in the installation location, the method comprising: a main precast member arrangement step of arranging the main precast member, which is a block-shaped precast concrete member made of precast reinforced concrete and which constitutes the support body, in the excavated installation location; an expanded precast member arrangement step of arranging a plurality of expanded precast members, which are block-shaped precast reinforced concrete and which constitute the expanded section, around the main precast member at a predetermined interval in the excavated installation location; The method is characterized by the fact that the reinforcing bars are provided on the opposing surfaces of the precast member and the widened precast member, and on the opposing surfaces of the widened precast members themselves, and the internal reinforcing bars protrude toward each other, and the closed closing protruding reinforcing bars are arranged alternately along the longitudinal direction perpendicular to the opposing direction, and an auxiliary reinforcing bar arrangement process is carried out in which auxiliary reinforcing bars are arranged along the longitudinal direction inside the closing protruding reinforcing bars arranged alternately along the longitudinal direction, and a joint construction process is carried out in which joint hardening material is filled between the opposing surfaces at the specified intervals so that the closing protruding reinforcing bars are internal, and the joint is hardened to form a joint.

[0008] The support members include pillar members that constitute structures such as fences, louvers, or sheds, poles attached to fences, structural walls, and the like.

[0009] According to this invention, a foundation structure to be buried in an installation location can be constructed with high workability. Specifically, the support structure includes a support body that supports the load of a structure by attaching a support member to its upper surface, and an expansion section that expands the support body and is buried in the installation location. The support body is a block-shaped precast member made of precast reinforced concrete, and the expansion section is composed of multiple expansion precast members that are also block-shaped precast reinforced concrete and are arranged around the support body and buried in the installation location. Therefore, each block is smaller than when the support body and the expansion section are a single precast member. Therefore, workability is improved compared to when the support body and the expansion section are a single precast member.

[0010] On the other hand, since the widening portion that widens the supporting main body portion is composed of multiple widening precast members arranged around the supporting main body portion which is composed of a main precast member, the integrity of the widening portion may be reduced, and the strength of the foundation structure may be reduced.

[0011] In contrast, on each of the opposing surfaces of the main precast member and the widening precast member, and on each of the opposing surfaces of the widening precast members, there are provided closed closure protruding bars that protrude toward each other, and joints are formed at predetermined intervals between the main precast member and the widening precast member, and between the widening precast members, and the joints are provided with the closure protruding bars protruding from each of the opposing surfaces arranged alternately along a longitudinal direction perpendicular to the opposing direction, and auxiliary bars along the longitudinal direction that are arranged inside the closure protruding bars arranged alternately along the longitudinal direction, and a joint hardening material that is filled between the opposing surfaces and hardened so as to contain the closure protruding bars.

[0012] In other words, the joints formed at predetermined intervals between the main precast member and the widened precast member, and between the widened precast members themselves, protrude toward each other from the opposing faces of the main precast member and the widened precast member, and from the opposing faces of the widened precast members themselves. The closure protruding bars are arranged alternately along the longitudinal direction perpendicular to the facing direction, and auxiliary rebars are arranged inside the closure protruding bars arranged alternately along the longitudinal direction. The joint hardening material filled between the opposing faces hardens to contain the closure protruding bars. This allows the main precast member and the widened precast member, and the widened precast members themselves, to be structurally integrated. This allows the structurally integrated foundation structure to be constructed with high workability.

[0013] As an aspect of the present invention, the auxiliary reinforcing bars may be formed to a length that does not allow them to be placed at cross joints where the joints cross each other. This invention can further improve the workability.

[0014] In particular, when the auxiliary rebars that constitute the joints between the widening precast members that constitute the widening section embedded in the installation site or between the widening precast member and the main precast member are long and span cross joints, there is a risk that they will interfere with the surrounding area when they are placed longitudinally inside the closure protruding rebars that are alternately placed along the longitudinal direction between the widening precast members that are placed in the installation site dug deeper than the surrounding area, or between the widening precast member and the main precast member, reducing workability. In contrast, by forming the auxiliary rebars to a length that does not allow them to be placed at the cross joints where the joints intersect, they can be easily placed longitudinally inside the closure protruding rebars that are alternately placed along the longitudinal direction between the widening precast members that are placed in the installation site dug deeper than the surrounding area, without interfering with the surrounding area of ​​the installation site, further improving workability.

[0015] In another aspect of the present invention, the main precast member may be formed to be taller than the widening precast member. This invention makes it possible to ensure the strength of the main precast member that supports the support member, while making the widening precast member that constitutes the widening section compact and lightweight.

[0016] In another aspect of the present invention, the main precast member and the widening precast member may be rectangular in plan view. According to this invention, the widening precast members, which are rectangular in plan view, can be arranged around the main precast member, which is rectangular in plan view, to form the foundation structure of the desired shape.

[0017] In another aspect of the present invention, the main precast member may be square in plan view. According to this invention, the foundation structure can be formed in the desired shape by arranging the widening precast members around the main precast member, regardless of the orientation of the main precast member.

[0018] In another aspect of the present invention, the widening precast members may be arranged horizontally and vertically in plan view so as to face each side of the main precast member, which is square in plan view. According to this invention, the foundation structure can be constructed by arranging the widening precast members in a grid pattern relative to the main precast member.

[0019] In another aspect of the present invention, the widening precast member may be arranged in a diagonal direction that intersects the horizontal and vertical directions in plan view relative to the main precast member, which is square in plan view. According to this invention, the widening precast members can be arranged around the main precast member, which is square in plan view, without any gaps, thereby forming a highly rigid foundation structure.

[0020] In another aspect of the present invention, the main precast member has a square shape when viewed from above, and one of the horizontal and vertical directions when viewed from above is designated as one direction, and the other direction is designated as the other direction, and the widened precast member arranged in the one direction relative to the main precast member is a same-width widened precast member formed with the same width as the length of the main precast member in the other direction, and the widened precast member arranged in the other direction relative to the main precast member is a long-width widened precast member formed with the same length in the one direction as the length in the one direction of the main precast member, the two joint portions, and the two same-width widened precast members.

[0021] In another aspect of this invention, for the main precast member, which is square in plan view, one of the horizontal and vertical directions in plan view may be designated as one direction, and the other direction may be designated as the other direction, and the widening precast member arranged in the one direction relative to the main precast member may be formed so that its length in the other direction is equal to the length in the other direction of the main precast member, the joint portion, and the widening precast member arranged in the other direction.

[0022] These inventions make it possible to reduce the number of widening precast members while arranging them around the main precast member, which is square in plan view, without any gaps, thereby creating a highly rigid foundation structure.

[0023] As another aspect of the present invention, the joint portion may be set to a width that allows an operator to insert his / her hand and a depth that allows the operator to work. According to this invention, increasing the gap between the main precast member and the widened precast member, or between the widened precast members themselves, improves the workability of the reinforcing steel arrangement work, but increases the width of the joints, which may reduce the rigidity of the foundation structure. In contrast, by setting the joints to a width and depth that allows workers to insert their hands and work, it is possible to improve workability while maintaining the rigidity of the foundation structure.

[0024] The present invention is also characterized in that the widening precast member in the above-mentioned foundation structure is buried in the installation location and the support member is attached to the upper surface of the support main body.

[0025] The present invention is also characterized by a method for constructing a structure, in which the support member is attached to the upper surface of the support main body portion of the foundation structure constructed by the above-mentioned method for constructing a foundation structure.

[0026] The above-mentioned structures include fences equipped with supports (support members) such as poles, incidental facilities such as fins, louvers or benches, exterior structures, and even sheds equipped with structural walls (support members). These inventions enable structures to be constructed with high workability by attaching support members to a foundation structure that is buried at the installation site.

[0027] This invention is also characterized in that the widening precast member in the above-mentioned foundation structure is buried in the installation location, the support member is attached to the upper surface of the support main body, and a roof material is provided on top of the support member.

[0028] This invention is also characterized by a method for constructing a shed structure, in which the support member is attached to the upper surface of the support main body portion of the foundation structure constructed by the above-mentioned method for constructing a foundation structure, and a roof material is attached to the top of the support member. These inventions enable construction of a shed structure with high workability by attaching support members to a foundation structure that is buried at the installation site. [Effects of the Invention]

[0029] The present invention makes it possible to provide a foundation structure and a construction method thereof, a structure and a construction method thereof, and a shed structure and a construction method thereof, which are buried in the installation location and can be constructed with high workability. [Brief explanation of the drawings]

[0030] [Figure 1] An explanatory diagram of the foundation structure and upper structure. [Figure 2] FIG. [Figure 3] FIG. [Figure 4] FIG. [Figure 5] Flowchart of a method for constructing a shed structure. [Figure 6] Schematic diagram of the construction status of the foundation structure. [Figure 7] An explanatory diagram explaining how to construct the upper structure. [Figure 8] An explanatory diagram explaining how to construct the upper structure. [Figure 9] FIG. 10 is an explanatory diagram of the foundation structure and shed structure of the second embodiment. [Figure 10] FIG. 10 is an explanatory diagram of a foundation structure according to a second embodiment. [Figure 11] FIG. 10 is an explanatory diagram of a foundation structure according to a second embodiment. [Figure 12] FIG. 10 is a schematic cross-sectional view of a foundation structure according to a second embodiment. [Figure 13] FIG. 10 is an explanatory diagram of the foundation structure and shed structure of the third embodiment. [Figure 14] FIG. 10 is an explanatory diagram of a foundation structure according to a third embodiment. [Figure 15] FIG. 10 is an explanatory diagram of a foundation structure according to a third embodiment. [Figure 16] FIG. 10 is a schematic cross-sectional view of a foundation structure according to a third embodiment. [Figure 17] FIG. 10 is an explanatory diagram of the foundation structure and shed structure of the fourth embodiment. [Figure 18] FIG. 10 is an explanatory diagram of a foundation structure according to a fourth embodiment. [Figure 19] FIG. 10 is an explanatory diagram of a foundation structure according to a fourth embodiment. [Figure 20] An explanatory diagram of the foundation structure and shed structure of the fifth embodiment. [Figure 21] FIG. 11 is an explanatory diagram of a foundation structure according to a fifth embodiment. [Figure 22] FIG. 11 is an exploded perspective view of a foundation structure according to a fifth embodiment. [Figure 23] An explanatory diagram of the foundation structure and shed structure of the sixth embodiment. [Figure 24] FIG. 13 is an explanatory diagram of a foundation structure according to a sixth embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0031] An embodiment of the present invention will be described below with reference to the drawings. (First embodiment) The shed structure 1 and the foundation structure 10 used in the shed structure 1 according to the first embodiment will be described below with reference to FIGS.

[0032] Figure 1 shows an explanatory diagram of the foundation structure 10 and the shed structure 1, Figure 2 shows an explanatory diagram of the foundation structure 10, Figure 3 shows an exploded oblique view of the foundation structure 10, Figure 4 shows a schematic cross-sectional view of the foundation structure 10, Figure 5 shows a flowchart of a method for constructing the shed structure 1, Figure 6 shows a schematic explanatory diagram of the construction status of the foundation structure 10, and Figures 7 and 8 show explanatory diagrams explaining the method for constructing the shed structure 1.

[0033] In more detail, Fig. 1(a) shows a perspective view of the front, right side, and top of the shed structure 1, and Fig. 1(b) shows a perspective view of the front, right side, and top of the foundation structure 10. Note that Fig. 1(a) does not show the height adjustment member 4 that adjusts the position of the column member 2 in the height direction H, and the roof material.

[0034] Fig. 2(a) shows a left side view of the foundation structure 10, Fig. 2(b) shows a plan view of the foundation structure 10, Fig. 2(c) shows a front view of the foundation structure 10, and Fig. 2(d) shows a bottom view of the foundation structure 10. Note that the back view of the foundation structure 10 appears the same as the front view, and the right side view of the foundation structure 10 appears the same as the left side view. FIG. 3 shows an exploded perspective view of the base structure 10, showing the front, right side, and top views.

[0035] Fig. 4 shows a cross-sectional view cut along a horizontal plane so that the reinforcement arrangement inside the foundation structure 10 can be seen, and Fig. 5 shows a flowchart of a method for constructing the shed structure 1. In the flowchart of the method for constructing the shed structure 1 shown in Fig. 5, the steps from the installation process of the precast members 30 (step s5) to the construction of the joint part 60 (step s8) are the method for constructing the foundation structure 10.

[0036] Figure 6 shows a schematic diagram of the construction status of the foundation structure 10, and Figure 6(a) shows a schematic diagram showing the reinforcing bar 61 placement process (step s6), and Figure 6(b) shows a schematic diagram of the shed structure 1 in its completed state.

[0037] 7 and 8 are explanatory diagrams illustrating a method for constructing the shed structure 1. Fig. 7(a) shows a schematic diagram of the excavation process (step s1) in which an excavation recess 100, which is the installation location for installing the foundation structure 10, is excavated, and Fig. 7(b) shows a schematic diagram of the bedding process (step s2) in which crushed stone 101 is laid on the excavated recess 100, which is the installation location. Fig. 7(c) is a schematic diagram of the precast member installation process (step s5) in which the main precast member 20 has been installed, and Figs. 7(d) and 7(e) show schematic diagrams of the widening precast member 30 having been installed on the installed main precast member 20.

[0038] In addition, Figure 8(a) shows a schematic diagram of the auxiliary rebar placement process (step s6) in which auxiliary rebar 61 is placed, Figure 8(b) shows a schematic diagram of the joint section 60 construction process (step s8), and Figure 8(c) shows a schematic diagram of the steel column erection process (step s11).

[0039] 1(a) is defined as the height direction H, the direction connecting the upper left and lower right is defined as the width direction W, and the direction connecting the lower left and upper right is defined as the depth direction D. Furthermore, the upper side of the height direction H is defined as the upper HU, the lower side as the lower HD, the upper left side of the width direction W connecting the upper left and lower right is defined as the left WL, the lower right side as the right WR, and the lower left side of the depth direction D connecting the lower left and upper right is defined as the front side DF, and the upper right side as the back side DB. Furthermore, the above directions are used not only in the description of the shed structure 1 but also in the description of the foundation structure 10, and the same applies hereinafter in FIGS. 2 to 24.

[0040] The shed structure 1 of the present invention includes a roof material (not shown) for a station shed or the like and pillar members 2, and uses a foundation structure 10 that supports the pillar members 2. As shown in Fig. 1, the column member 2 is a steel frame member made of H-shaped steel extending in the height direction H, and is provided with an end plate 3 at the end of the lower HD. The end plate 3 is provided with bolt holes through which anchor bolts 111 provided on the upper surface of the support body 11, which will be described later, are inserted. A height adjustment member 4 (Fig. 6) is provided between the upper surface of the support body 11 and the end plate 3.

[0041] The height adjustment material 4 is arranged between the top surface of the support body 11 and the bottom surface of the end plate 3, and is made of a thick mortar or the like. The height adjustment material 4 adjusts the distance between the support body 11 and the end plate 3, thereby adjusting the position of the column member 2 in the height direction H, and hardens between the support body 11 and the end plate 3 after adjustment.

[0042] The foundation structure 10 is a foundation structure that supports the end plate 3 in the shed structure 1, and is equipped with a support main body portion 11 that supports the end plate 3 by attaching it to its upper surface, and an expansion portion 12 that expands the support main body portion 11 in the width direction W and depth direction D and is buried in the installation location, and as shown in Figure 2, is formed in an approximately square shape when viewed from the top and in a convex shape when viewed from the front and left side.

[0043] The support body 11 is square in plan view, larger in size than the H-shaped steel that constitutes the end plate 3, and is formed as a quadrangular prism whose height H is longer than the side length of the square in plan view, and is provided with an anchor bolt 111 on its upper surface.

[0044] The anchor bolts 111 are bolt materials that are fixed inside the support body 11 and protrude upward from the top surface of the support body 11 toward the HU, and are provided near each corner of the top surface of the support body 11, which is square in plan view. The widening portion 12 is approximately a flat plate with a square shape in a plan view, with a height of about half the height H of the support main body portion 11, which is wider in the width direction W and depth direction D than the support main body portion 11, and is the part that is buried when installed.

[0045] The foundation structure 10, in which each element is configured in this manner, has a configuration in which the support main body portion 11, which is square in plan view, protrudes upward HU from the center of the widening portion 12, which is square in plan view, and as described above, has a convex shape when viewed from the front and left side.

[0046] As described above, the foundation structure 10 consisting of the support body portion 11 and the widening portion 12 is constructed by joining precast members 20, 30 of a size that can be carried by human power at joint portions 60 to form an integrated structure. More specifically, the support body 11, which together with the widening portion 12 constitutes the foundation structure 10, is made up of a main precast member 20, which is a square pillar block made of precast reinforced concrete. The widening portion 12, which together with the support body 11 constitutes the foundation structure 10, is made up of a plurality of widening precast members 30 arranged around the main precast member 20 that constitutes the support body 11.

[0047] As described above, the main precast member 20 constituting the support body 11 is a rectangular block made of precast reinforced concrete, and has closing steel bars 22 protruding outward from each of the side surfaces 21, provided in the lower half of the HD of the side surfaces 21.

[0048] In detail, the closing steel bar 22 protrudes horizontally from inside the main precast member 20 in a direction perpendicular to the side surface 21, then bends at approximately a right angle and extends downward along the height direction H toward the HD, and then bends again at approximately a right angle and extends horizontally to the inside of the main precast member 20 in a direction perpendicular to the side surface 21, forming a horizontal, angular U-shape when viewed from the front or side.

[0049] In addition, the main precast member 20, which is formed in the shape of a rectangular pillar, has four side surfaces 21: two surfaces facing the depth direction D along the width direction W and height direction H, and two surfaces facing the width direction W along the depth direction D and height direction H, and three closing steel bars 22 are provided on each side surface 21.

[0050] More specifically, three closing reinforcing bars 22 are provided at predetermined intervals in the width direction W on each of the side surfaces 21 that face each other in the depth direction D along the width direction W and the height direction H. The closing reinforcing bars 22 provided on each of the side surfaces 21 that face the depth direction D along the width direction W and the height direction H are connected inside the main precast member 20. In other words, the closing reinforcing bars 22 provided on each of the side surfaces 21 that face the depth direction D along the width direction W and the height direction H are formed of reinforcing bars that are long in the depth direction D and short in the height direction H and have a rectangular frame shape when viewed from the width direction W, and are arranged in the main precast member 20 so that both ends in the depth direction D protrude from the side surfaces 21.

[0051] Similarly, the closing reinforcing bars 22 provided on each of the side surfaces 21 that face the width direction W along the depth direction D and the height direction H are connected inside the main precast member 20. In other words, the closing reinforcing bars 22 provided on each of the side surfaces 21 that face the width direction W along the depth direction D and the height direction H are formed of reinforcing bars that are long in the width direction W and short in the height direction H and have a rectangular frame shape when viewed from the depth direction D, and are arranged in the main precast member 20 so that both ends in the width direction W protrude from the side surfaces 21.

[0052] The main precast member 20 configured in this manner is a precast concrete block made of concrete of a predetermined strength, and contains predetermined rebars other than the closing rebars 22. The closing rebars 22 protrude vertically from each side surface 21 below HD of each side surface 21. The amount by which the closing rebars 22 protrude from the side surface 21 is shorter than the width of the joint portion 60 described below, and is set to a length equal to or greater than half the width of the joint portion 60.

[0053] The multiple widening precast members 30 (40, 50) arranged around the above-mentioned main precast member 20 and constituting the widening section 12 are flat block-shaped, square in plan view like the main precast member 20, and about half the height in the height direction H of the main precast member 20 constituting the supporting main body section 11, with closing steel bars 32 protruding from the side surfaces 31 (41, 51).

[0054] More specifically, among the multiple widening precast members 30 that make up the widening section 12, there are four central widening precast members 40 that face the side 21 of the main precast member 20, which is square in plan view, in the width direction W or depth direction D, and four corner widening precast members 50 that are arranged diagonally in the width direction W and depth direction D relative to the main precast member 20.

[0055] The central widening precast member 40, which has the same square shape in plan view as the main precast member 20, is provided with closing reinforcing bars 32 similar to the above-mentioned closing reinforcing bars 22 on the side 41 opposite the side 21 of the main precast member 20 and the side 41 opposite the side 51 of the corner widening precast member 50, out of the four directions of the width direction W and the depth direction D.

[0056] In addition, the closing reinforcing bars 32 provided on the side 41 opposite the side 21 of the main precast member 20 are provided at positions approximately corresponding to the closing reinforcing bars 22 of the main precast member 20, and the closing reinforcing bars 32 provided on a set of side surfaces 41 opposite the side surface 51 of the corner widening precast member 50 are provided in groups of three at positions approximately corresponding to the closing reinforcing bars 32 of the corner widening precast member 50 described below.

[0057] The closing reinforcing bar 32 provided on the side 41 opposite the side 21 of the main precast member 20 is formed in a square U-shape that is long in the direction opposite the main precast member 20 (width direction W or depth direction D) and short in the height direction H, and is arranged in the central widening precast member 40 so that one end in the direction opposite the main precast member 20 (width direction W or depth direction D) protrudes from the side 41 toward the main precast member 20.

[0058] The closing reinforcing bars 32 provided on a pair of side surfaces 41 opposite to the side surfaces 51 of the corner widening precast member 50 are formed of rectangular frame-shaped reinforcing bars that are long in the opposing direction (width direction W or depth direction D) and short in the height direction H, and are arranged in the central widening precast member 40 so that both ends in the opposing direction (width direction W or depth direction D) protrude beyond the side surfaces 41.

[0059] In the corner-widening precast member 50, which has the same square shape in plan view as the main precast member 20, closing reinforcing bars 32 similar to the above-mentioned closing reinforcing bars 22 are provided on two of the four sides 51 of the width direction W and depth direction D that face the side 41 of the central widening precast member 40.

[0060] In addition, the closing steel bars 32 provided on the two side surfaces 51 opposite the side surface 41 of the central widening precast member 40 are provided in threes at positions approximately corresponding to the closing steel bars 32 of the central widening precast member 40 described above.

[0061] The closing reinforcing bars 32 provided on the two side surfaces 51 opposite the side surface 41 of the central widening precast member 40 are formed in a square U-shape that is long in the direction opposite the side surface 41 of the central widening precast member 40 (width direction W or depth direction D) and short in the height direction H, and are arranged in the corner widening precast member 50 so that one end in the direction opposite the main precast member 20 (width direction W or depth direction D) protrudes from the side surface 51 toward the central widening precast member 40.

[0062] The widening precast member 30 (40, 50) constructed in this manner is a precast concrete block made of concrete of a specified strength, which contains specified reinforcing bars other than the closing reinforcing bars 32 and has closing reinforcing bars 32 protruding vertically from each side surface 31 (41, 51).

[0063] Furthermore, the main precast member 20 and the widening precast members 30 (40, 50) constructed in this manner are arranged at a predetermined interval in the width direction W and depth direction D, and the main precast member 20 and the central widening precast member 40, and the central widening precast member 40 and the corner widening precast member 50 are integrated by joint sections 60 formed between the main precast member 20 and the central widening precast member 40, and between the central widening precast member 40 and the corner widening precast member 50 to form the foundation structure 10.

[0064] The joints 60 are formed in the spaces between the four central widening precast members 40, which are arranged at predetermined intervals in the width direction W and depth direction D relative to the main precast member 20, which is arranged in the center in a plan view, and the four corner widening precast members 50, which are arranged at predetermined intervals between the central widening precast members 40 in the diagonal directions of the width direction W and depth direction D relative to the main precast member 20. Therefore, in the foundation structure 10 in which the main precast members 20 and the widening precast members 30 (40, 50) are arranged as described above, the joints 60 extending in the width direction W and depth direction D form a well-shaped structure in a plan view.

[0065] The joint portion 60 is composed of closing reinforcing bars 22, 32 arranged between the main precast member 20 and the central widening precast member 40, an auxiliary reinforcing bar 61 arranged inside the closing reinforcing bar 32 arranged between the central widening precast member 40 and the corner widening precast member 50, and a grout hardened body 62 containing the closing reinforcing bars 22, 32 and the auxiliary reinforcing bar 61.

[0066] The auxiliary steel bars 61 are straight steel bars with the same diameter as the closing steel bars 22 and 32, and are formed with a length shorter than the side length of the main precast member 20 and the widening precast member 30, which are square in plan view. In addition, four auxiliary steel bars 61 are provided at each joint section 60 so that they are arranged at the four corners in two upper and lower rows inside the rectangular shape formed by the closing steel bars 22, 32 or the closing steel bars 32, between the main precast member 20 and the central widening precast member 40, where the square U-shaped closing steel bars 22, 32 or the closing steel bars 32 are arranged facing each other, and between the central widening precast member 40 and the corner widening precast member 50.

[0067] The hardened grout 62 is injected between the main precast member 20 and the central widening precast member 40, and between the central widening precast member 40 and the corner widening precast member 50, and hardens, thereby forming a grout material having a predetermined strength while containing the closing reinforcing bars 22, 32 and the auxiliary reinforcing bars 61 placed inside them.

[0068] As described above, the joint portion 60 configured in this manner is formed between the main precast member 20 and the central widening precast member 40, and between the central widening precast member 40 and the corner widening precast member 50, and its width is set to a width that allows a worker to insert his or her hand to reinforce and bind the lower grout hardened body 62.

[0069] In the foundation structure 10 having the main precast member 20, widening precast members 30 (40, 50), and joint portions 60 configured in this manner, the central widening precast member 40 is arranged at a predetermined interval in the width direction W and depth direction D of the main precast member 20, which is arranged in the center in a plan view, and the corner widening precast members 50 are arranged diagonally to the main precast member 20 at a predetermined interval from the central widening precast member 40 adjacent to it in the width direction W and depth direction D. At this time, between the main precast member 20 and the central widening precast member 40, and between the central widening precast member 40 and the corner widening precast member 50, closing reinforcing bars 22, 32 are arranged in an alternating opposing direction along the width direction W or depth direction D, and auxiliary reinforcing bars 61 are arranged inside them. Then, the grout hardening body 62 is hardened so that the closing reinforcing bars 22, 32 placed inside are contained within to form the joint section 60, and the main precast member 20 and the widening precast member 30 (40, 50) are integrated to form the foundation structure 10.

[0070] In this case, the auxiliary steel bars 61 are formed to a length shorter than the side length of the main precast member 20 and the widening precast member 30, which are square in plan view, so the intersection parts of the joint parts 60 extending in the width direction W and depth direction D, which are formed in a well shape in plan view, are unreinforced with only the grout hardened body 62, as shown in Figure 4.

[0071] Then, as shown in Figure 6(b), the foundation structure 10 is placed in an excavated recess 100 that has been dug out from the surrounding area, and end plates 3 are erected on the upper surface of the support main body 11 to form the shed structure 1, which is then completed by backfilling with backfill soil 110.

[0072] Next, a method for constructing the shed structure 1 and the foundation structure 10 will be described with reference to FIGS. First, in constructing the shed structure 1, the installation location of the foundation structure 10 is excavated to form an excavation recess 100 (excavation process: step s1, see FIG. 7(a)). The excavation recess 100 is excavated to a depth wider than the planar size of the foundation structure 10 and slightly shallower than the support main body 11. In the excavation process (step s1), the excavation recess 100 may be excavated by machine or by human power.

[0073] Then, as shown in Fig. 7(b), crushed stone 101 is laid on the bottom of the excavation recess 100 at a predetermined height (laying step: step s2, see Fig. 7(b)). The locations where the precast members 20, 30 will be placed on the laid crushed stone 101 are marked out (ground marking step: step s3), and the level of the laying surface is adjusted so that the precast members 20, 30 can be placed horizontally at a predetermined height (level adjustment step: step s4).

[0074] The precast members 20, 30 are installed on the flooring surface that has been leveled as described above (precast member installation step: step s5). Specifically, as shown in Figure 7(c), the main precast member 20, which is placed at the center of the square foundation structure 10 in plan view and which constitutes the support body 11, is first installed on the flooring surface. At this time, the closing reinforcing bars 22 provided on the lower half of the HD on the side surface 21 of the main precast member 20 protrude in the width direction W and the depth direction D.

[0075] 7(d) and 7(e), the widening precast members 30 (40, 50) are installed at predetermined intervals around the installed main precast member 20. At this time, closing rebars 22, 32 are alternately arranged in opposing directions along the width direction W or depth direction D between the main precast member 20 and the central widening precast member 40, and between the central widening precast member 40 and the corner widening precast members 50.

[0076] In the precast member installation step (step s5), the precast members 20, 30 are formed to a size that can be carried by human power, and therefore the precast members 20, 30 can be installed by human power.

[0077] Next, auxiliary reinforcing bars 61 are arranged inside the closing reinforcing bars 22, 32, which are arranged alternately in opposing directions along the width direction W or depth direction D between the main precast member 20 and the central widening precast member 40, and between the central widening precast member 40 and the corner widening precast member 50 (auxiliary reinforcing bar arrangement process: step s6, see Figures 6(a) and 8(a)).

[0078] In this case, for example, if an attempt is made to place a long auxiliary rebar 61X, shown by a dashed line in Figure 6(a), inside the closing rebars 22, 32 between the main precast member 20 and the central widening precast member 40 installed in an excavation recess 100 dug downward HD from the periphery, the auxiliary rebar 61X will interfere with the ground surrounding the excavation recess 100 and the closing rebars 32 between the central widening precast member 40 and the corner widening precast members 50, making it impossible to place the rebar. In contrast, the auxiliary rebar 61 is formed shorter than the side length of the square-shaped precast members 20, 30 in plan view, and therefore can be placed in the specified position without interfering with the ground surrounding the excavation recess 100 or the other closing rebars 22, 32.

[0079] In addition, the distance between the main precast member 20 and the central widening precast member 40 that make up the joint portion 60, and between the central widening precast member 40 and the corner widening precast member 50, is set to a width that allows a worker to insert his or her hand to reinforce and bind the lower grout hardened body 62, so that the auxiliary reinforcing bars 61 can be smoothly arranged inside the closing reinforcing bars 22, 32 that are arranged alternately in opposing directions along the width direction W or depth direction D.

[0080] In order to inject the grout material that forms the grout hardened body 62 between the main precast member 20 and the central widening precast member 40 and between the central widening precast member 40 and the corner widening precast members 50, a formwork is assembled and installed along the outer periphery of the installed widening precast member 30 (formwork assembly process: step s7), and the grout material is injected between the main precast member 20 and the central widening precast member 40, and between the central widening precast member 40 and the corner widening precast members 50, where auxiliary reinforcing bars 61 have been arranged inside the closing reinforcing bars 22, 32 that are arranged alternately in opposing directions along the width direction W or depth direction D (joint construction process: step s8, see Figure 8(b)). Furthermore, when the injected grout material reaches a predetermined strength and hardens, the formwork installed in the formwork construction process (step s7) can be dismantled (formwork dismantling process: step s9), and a foundation structure 10 can be constructed in which the precast members 20, 30 are integrated by the joint part 60.

[0081] The pillar member 2 is positioned by inserting the anchor bolt 111 protruding upward from the top surface of the support main body 11 of the foundation structure 10 constructed in this manner into the bolt hole in the end plate 3 provided at the end of the lower HD of the pillar member 2, and the height is adjusted using the height adjustment material 4 placed between the end plate 3 and the top surface of the support main body 11 and the nut 5 screwed onto the anchor bolt 111 (see Figure 8(c)) (pillar base height adjustment process: step s10).

[0082] Then, once the height adjustment material 4 hardens and the nuts 5 are tightened, the erection of the pillar member 2 is complete (steel pillar erection process: step s11, see Figure 8(c)). After the erection of the pillar member 2 is complete, the excavated recess 100 in which the foundation structure 10 with the pillar member 2 erected is installed is backfilled with backfill soil 110 to the initial height, thereby completing the construction of the shed structure 1 as shown in Figure 6(b).

[0083] In the above explanation, the formwork dismantling process (step s9) was carried out after the grout material injected in the joint construction process (step s8) had attained a predetermined strength and hardened, but the formwork dismantling process may also be carried out after the column base height adjustment process (step s10) or the steel column erection process (step s11).

[0084] In this way, the foundation structure 10 in the shed structure 1, which is equipped with roofing material and column members 2, is equipped with a support main body portion 11 that supports the column members 2 by attaching them to its upper surface, and an expansion portion 12 that expands the support main body portion 11 and is buried in the installation location, the support main body portion 11 is a main precast member 20 that is a block-shaped member made of precast reinforced concrete, and the expansion portion 12 is composed of a plurality of expansion precast members 30 that are also block-shaped member made of precast reinforced concrete and are arranged around the support main body portion 11 and buried in the installation location, and on each of the opposing side surfaces 21, 31 of the main precast member 20 and the expansion precast member 30, and on each of the opposing side surfaces 31 of the expansion precast members 30, closed closing steel bars 22, 32 that protrude toward the other are provided, and joint portions 60 are formed at predetermined intervals between the main precast member 20 and the expansion precast member 30, and between the expansion precast members 30 themselves. The joint portion 60 has closing reinforcing bars 22, 32 protruding from each of the side surfaces 21, 31 and arranged alternately along the width direction W or depth direction D, which is perpendicular to the opposing direction, and is provided with auxiliary reinforcing bars 61 arranged along the width direction W or depth direction D, which are arranged inside the closing reinforcing bars 22, 32 arranged alternately along the width direction W or depth direction D, and a hardened grout body 62 filled between the side surfaces 21, 31 and hardened so as to contain the closing reinforcing bars 22, 32.

[0085] In addition, as a method for constructing a foundation structure 10 for a shed structure 1 having a roof material and column members 2, the foundation structure 10 is provided with a support main body portion 11 that supports the column members 2 by attaching them to its upper surface, and an expansion portion 12 that expands the support main body portion 11 and is buried in the installation location, and an installation process (step s5) is performed in which a main precast member 20 that is a block-shaped precast reinforced concrete member and that constitutes the support main body portion 11 is placed in an excavated recess 100 that is the excavated installation location, and a plurality of expansion precast members 30 that are block-shaped precast reinforced concrete and that constitute the expansion portion 12 are placed around the excavated recess 100 that is the excavated installation location, at a predetermined interval from the main precast member 20. Then, the auxiliary reinforcing bars 61 are arranged along the width direction W or the depth direction D inside the closing reinforcing bars 22, 32 that are arranged alternately along the width direction W or the depth direction D, which are perpendicular to the opposing directions, and are provided on the opposing side surfaces 21, 31 of the main precast member 20 and the widening precast member 30, and on the opposing side surfaces 31 of the widening precast members 30, so that the internal reinforcing bars protrude toward each other. A reinforcement process (step s6) of auxiliary reinforcing bars 61 is performed in which auxiliary reinforcing bars 61 are arranged along the width direction W or the depth direction D inside the closing reinforcing bars 22, 32 that are arranged alternately along the width direction W or the depth direction D, and a construction process (step s8) of the joint portion 60 is performed in which grout hardened body 62 is filled between the side surfaces 21, 31 that are spaced a predetermined distance apart so that the closing reinforcing bars 22, 32 are internal, and hardened to form the joint portion 60.

[0086] In addition, the shed structure 1 has an expanded precast member 30 that constitutes the expanded portion 12 in the above-mentioned foundation structure 10 buried in the installation location, a pillar member 2 attached to the upper surface of the support main body portion 11, and a roofing material provided on the top of the pillar member 2.

[0087] Furthermore, there is provided a method for constructing a shed structure 1, in which a pillar member 2 is attached to the upper surface of the support main body portion 11 of the foundation structure 10 constructed by the above-mentioned method for constructing the foundation structure 10, and a roof material is attached to the top of the pillar member 2.

[0088] This allows the foundation structure 10 to be buried in the installation location to be constructed with high workability, and the shed structure 1 can be constructed by attaching the pillar members 2 to the foundation structure 10 to be buried in the installation location.

[0089] More specifically, the foundation structure 10 in the shed structure 1, which includes a support body 11 on the upper surface of which the column members 2 are attached and supported, and an expansion section 12 that expands the support body 11 and is buried in the installation location, is provided. The support body 11 of the foundation structure 10 in the shed structure 1, which includes the roof material and the column members 2, is a main precast member 20 in the form of a block made of precast reinforced concrete, and the expansion section 12 is composed of a plurality of expansion precast members 30 that are also in the form of a block made of precast reinforced concrete and are arranged around the support body 11 and buried in the installation location. Therefore, each block is smaller than when the support body 11 and the expansion section 12 are a single precast member. This improves workability compared to when the support body 11 and the expansion section 12 are a single precast member.

[0090] On the other hand, since the widening portion 12 that widens the supporting main body portion 11 is composed of multiple widening precast members 30 arranged around the supporting main body portion 11 which is composed of a main precast member 20, the integrity of the widening portion 12 may be reduced, and the strength of the foundation structure 10 may be reduced.

[0091] In contrast, on the opposing side surfaces 21, 31 of the main precast member 20 and the widening precast member 30, and on the opposing side surfaces 31 of the widening precast members 30, respectively, closing reinforcing bars 22, 32 protruding toward each other and are provided, and joint sections 60 are formed at predetermined intervals between the main precast member 20 and the widening precast member 30, and between the widening precast members 30, and the joint sections 60 are provided with the closing reinforcing bars 22, 32 protruding from each of the side surfaces 21, 31 arranged alternately along the width direction W or depth direction D, which is perpendicular to the opposing direction, and auxiliary reinforcing bars 61 arranged along the width direction W or depth direction D, which are arranged inside the closing reinforcing bars 22, 32 arranged alternately along the width direction W or depth direction D, and hardened grout 62 filled between the side surfaces 21, 31 so as to contain the closing reinforcing bars 22, 32.

[0092] In other words, the joints 60 formed at predetermined intervals between the main precast member 20 and the widening precast member 30, and between the widening precast members 30, protrude toward each other from the opposing side surfaces 21, 31 of the main precast member 20 and the widening precast member 30, and from the opposing side surfaces 31 of the widening precast members 30, respectively. The closed closure rebars 22, 32 are alternately arranged along the width direction W or depth direction D, which are perpendicular to the opposing directions. Auxiliary rebars 61 are arranged along the width direction W or depth direction D inside the closing rebars 22, 32 alternately arranged along the width direction W or depth direction D. The hardened grout 62 filled between the side surfaces 21, 31 has hardened so that the closing rebars 22, 32 are contained within. This allows the main precast member 20 and the widening precast member 30, and the widening precast members 30 to be structurally integrated. Therefore, the structurally integrated foundation structure 10 can be constructed with high workability.

[0093] Furthermore, the auxiliary reinforcing bars 61 are formed to a length that prevents them from being placed at the intersections of the joint parts 60 where the joint parts 60 intersect with each other, which further improves workability. In more detail, if the auxiliary reinforcing bars 61 that make up the joint section 60 formed between the widening precast members 30 that make up the widening section 12 buried at the installation location, or between the widening precast members 30 and the main precast member 20, are long auxiliary reinforcing bars 61X that span the intersection of the joint section 60, when they are placed along the width direction W or depth direction D inside the closing reinforcing bars 22, 32 that are arranged alternately along the width direction W or depth direction D between the widening precast members 30 that are placed at an installation location dug down from the surrounding area, or between the widening precast members 30 and the main precast member 20, there is a risk that they will interfere with the surroundings of the installation location, reducing workability. In contrast, by forming the auxiliary reinforcing bars 61 at a length that does not allow them to be placed at the intersections of the joint parts 60 where the joint parts 60 intersect, they can be easily placed along the width direction W or depth direction D inside the closing reinforcing bars 22, 32 that are arranged alternately along the width direction W or depth direction D between the widening precast members 30 placed at an installation location dug down from the surrounding area, or between the widening precast members 30 and the main precast member 20, without interfering with the surrounding area of ​​the installation location, further improving workability.

[0094] Furthermore, since the main precast member 20 is formed taller than the widening precast member 30, the strength of the main precast member 20 supporting the column member 2 can be ensured while the widening precast member 30 that constitutes the widening section 12 can be made compact and lightweight.

[0095] Furthermore, since the main precast member 20 and the widening precast member 30 are rectangular in plan view, the widening precast member 30, which is rectangular in plan view, can be placed around the main precast member 20, which is rectangular in plan view, to form a foundation structure 10 of the desired shape.

[0096] Furthermore, since the main precast member 20 has a square shape when viewed from above, the widening precast members 30 can be placed around it to form a foundation structure 10 of the desired shape, regardless of the orientation of the main precast member 20.

[0097] Furthermore, since the widening precast members 30 are arranged in the width direction W and depth direction D in plan view so as to face each side surface 21 of the main precast member 20, which is square in plan view, the widening precast members 30 can be arranged in a grid pattern relative to the main precast member 20 to form the foundation structure 10.

[0098] Furthermore, since the corner widening precast members 50 are arranged in a diagonal direction that intersects the width direction W and depth direction D in plan view relative to the main precast member 20, which is square in plan view, the widening precast members 30 can be arranged around the main precast member 20, which is square in plan view, without any gaps, thereby forming a highly rigid foundation structure 10.

[0099] Furthermore, the joints 60 are set to a width that allows a worker to insert their hands and a depth that allows them to work. Therefore, widening the gap between the main precast member 20 and the widening precast member 30, or between the widening precast members 30, improves the workability of the reinforcement work for the auxiliary rebars 61, but increases the width of the joints 60, which may reduce the rigidity of the foundation structure 10. In contrast, by setting the joints 60 to a width that allows a worker to insert their hands and a depth that allows them to work, it is possible to improve workability while maintaining the rigidity of the foundation structure 10.

[0100] (Second embodiment) Next, a shed structure 1A and a foundation structure 10A according to a second embodiment will be described with reference to FIGS. Note that Figure 9 shows an explanatory diagram of the foundation structure 10A and shed structure 1A of the second embodiment, Figures 10 and 11 show explanatory diagrams of the foundation structure 10A of the second embodiment, and Figure 12 shows a schematic cross-sectional view of the foundation structure 10A of the second embodiment.

[0101] 9(a) is a perspective view showing the front, right side, and top of the shed structure 1A, and FIG. 9(b) is a perspective view showing the front, right side, and top of the foundation structure 10A. Note that in FIG. 9(a), the height adjustment member 4 that adjusts the position of the column member 2 in the height direction H and the roof member are not shown.

[0102] Fig. 10(a) shows a left side view of the foundation structure 10A, Fig. 10(b) shows a plan view of the foundation structure 10A, Fig. 10(c) shows a front view of the foundation structure 10A, and Fig. 10(d) shows a bottom view of the foundation structure 10A. Note that the back view of the foundation structure 10A appears the same as the front view, and the right side view of the foundation structure 10A appears the same as the left side view.

[0103] Fig. 11(a) is an exploded perspective view of the foundation structure 10A showing the front, right side, and top, and Fig. 11(b) is a perspective view of the foundation structure 10A showing the front, right side, and top, with the joint 60A omitted. Note that Fig. 11(b) does not show the auxiliary reinforcing bars 61. FIG. 12 shows a cross-sectional view taken along a horizontal plane so that the reinforcement arrangement inside the foundation structure 10A can be seen.

[0104] The foundation structure 10 constituting the above-mentioned shed structure 1 has a support body 11 and an expansion section 12 formed of precast members 20, 30 having the same shape in a plan view, and is square in plan view. In contrast, the foundation structure 10A of the second embodiment has a main precast member 20 constituting the support body 11, which has a square shape in a plan view, and a rectangular expansion precast member 30A, which has a rectangular shape in a plan view, forming the expansion section 12. In the following description, the same components as those described above are denoted by the same reference numerals, and the description thereof will be omitted.

[0105] In detail, the rectangular widening precast member 30A that constitutes the foundation structure 10A is formed in a rectangular shape in plan view, with short sides the same length as the side length of the main precast member 20, which is formed as a square in plan view, and long sides the length of which is twice the side length of the main precast member 20 plus the width of the joint portion 60A.

[0106] One of the rectangular widening precast members 30A formed in this manner as a rectangle in a plan view is positioned at a predetermined distance on the front side DF of the main precast member 20, extending from the center of the width direction W opposite the main precast member 20 in the depth direction D toward the right side WR.

[0107] Another rectangular widening precast member 30A is positioned on the left side WL of the main precast member 20, at a predetermined distance, extending from the center in the depth direction D opposite the main precast member 20 in the width direction W toward the front side DF.

[0108] Another rectangular widening precast member 30A is positioned at a predetermined distance on the rear side DB of the main precast member 20, extending from the center in the width direction W opposite the main precast member 20 in the depth direction D toward the left side WL, and the remaining rectangular widening precast member 30A is positioned at a predetermined distance on the right side WR of the main precast member 20, extending from the center in the depth direction D opposite the main precast member 20 in the width direction W toward the rear side DB. Therefore, the four joint portions 60A that pass between the main precast member 20 and along the long sides of the rectangular widened precast member 30A intersect with each other at their central portions.

[0109] In the four rectangular widening precast members 30A arranged as described above, which are rectangular in plan view, half of the side surface 31A of the long side portion faces the side surface 21 of the main precast member 20, and the remaining half of the side surface 31A faces the side surface 31A of the short side portion of another rectangular widening precast member 30A.

[0110] The rectangular width-expanding precast member 30A has three closure reinforcing bars 32 on the side surface 31A of the short side of the rectangular width-expanding precast member 30A, which is rectangular in plan view, and six on the side surface 31A of the long side. However, the six closure reinforcing bars 32 on the side surface 31A of the long side are divided into three bars that are arranged alternately in the width direction W or depth direction D with the three closure reinforcing bars 22 on the side surface 21 of the main precast member 20, and three bars that are arranged alternately in the width direction W or depth direction D with the three closure reinforcing bars 32 on the side surface 31A of the short side of another rectangular width-expanding precast member 30A, with a small gap between them.

[0111] In this way, on the side surface 31A of the long side portion, three closing rebars 22 are arranged alternately in the width direction W or depth direction D with the three closing rebars 22 provided on the side surface 21 of the main precast member 20, and three closing rebars 32 are arranged alternately in the width direction W or depth direction D with the three closing rebars 32 provided on the side surface 31A of the short side portion of another rectangular widening precast member 30A, with a small gap between them. Therefore, the auxiliary rebars 61 arranged between the alternating closing rebars 22 and 32, or between the alternating closing rebars 32, are shorter than the side length of the main precast member 20, which has a square shape in plan view, similar to the auxiliary rebars 61 used in the foundation structure 10 described above. Therefore, as shown in FIG. 12, the intersections where the four joints 60A intersect each other at the center form unreinforced portions where no auxiliary rebars 61 are arranged.

[0112] The foundation structure 10A configured in this manner and the shed structure 1A using the foundation structure 10A can achieve the same functions and effects as the foundation structure 10 and the shed structure 1 using the foundation structure 10 described above. Furthermore, in relation to the main precast member 20, which is square in plan view, the rectangular widening precast member 30A, which is arranged in the depth direction D relative to the main precast member 20, is formed so that its length in the width direction W is equal to the length in the width direction W of the main precast member 20, the joint portion 60A and the rectangular widening precast member 30A arranged in the width direction W.

[0113] Therefore, while reducing the number of rectangular widening precast members 30A, the rectangular widening precast members 30A can be arranged around the main precast member 20, which is square in plan view, without any gaps, thereby forming a highly rigid foundation structure 10A.

[0114] (Third embodiment) Next, a shed structure 1B and a foundation structure 10B according to a third embodiment will be described with reference to FIGS. Note that Figure 13 shows an explanatory diagram of the foundation structure 10B and shed structure 1B of the third embodiment, Figures 14 and 15 show explanatory diagrams of the foundation structure 10B of the third embodiment, and Figure 16 shows a schematic cross-sectional view of the foundation structure 10B of the third embodiment.

[0115] In detail, Fig. 13(a) shows a perspective view of the front, right side, and top of the shed structure 1B, and Fig. 13(b) shows a perspective view of the front, right side, and top of the foundation structure 10B. Note that Fig. 13(a) does not show the height adjustment member 4 that adjusts the position of the column member 2 in the height direction H, and the roof member.

[0116] Fig. 14(a) shows a left side view of the foundation structure 10B, Fig. 14(b) shows a plan view of the foundation structure 10B, Fig. 14(c) shows a front view of the foundation structure 10B, and Fig. 14(d) shows a bottom view of the foundation structure 10B. Note that the back view of the foundation structure 10B appears the same as the front view, and the right side view of the foundation structure 10B appears the same as the left side view.

[0117] Fig. 15(a) is an exploded perspective view of the foundation structure 10B showing the front, right side, and top view, and Fig. 15(b) is a perspective view of the foundation structure 10B showing the front, right side, and top view, with the joint 60B omitted. Note that Fig. 15(b) does not show the auxiliary reinforcing bars 61. FIG. 16 shows a cross-sectional view taken along a horizontal plane so that the reinforcement arrangement inside the foundation structure 10B can be seen.

[0118] The foundation structure 10 constituting the above-mentioned shed structure 1 has a support body 11 and an expansion section 12 formed of precast members 20, 30 having the same shape in a plan view, and is square in plan view. In contrast, the foundation structure 10B of the third embodiment has an expansion section 12 formed by using expansion precast members 30B (40, 50B) for the main precast member 20 constituting the support body 11 having a square shape in a plan view.

[0119] In detail, the widening precast member 30B that constitutes the foundation structure 10B includes a central widening precast member 40 in the foundation structure 10, and a rectangular widening precast member 50B that is rectangular in plan view and is composed of a short side the same length as the side length of the main precast member 20, which is formed into a square shape in plan view, and a long side the same length as the side length of the foundation structure 10B.

[0120] The rectangular widening precast member 50B, which is formed in this manner as a rectangle when viewed from above, is arranged in a direction along the width direction W on the front side DF and rear side DB of the main precast member 20 so as to face the main precast member 20 in the depth direction D. The central widening precast member 40 is arranged on both sides of the width direction W of the main precast member 20, and therefore is arranged between both sides of the width direction W of the rectangular widening precast members 50B which are arranged on the front side DF and the back side DB of the main precast member 20. Therefore, a horizontal H-shape is formed in a plan view between the main precast member 20 and the central widening precast member 40 by four joint parts 60B which run along the depth direction D and along the long sides of the rectangular widening precast members 50B.

[0121] A total of nine closing reinforcing bars 32 are provided on the side surface 51B of the long side portion that is on the inside in the depth direction D of the rectangular width-enlarging precast member 50B configured as described above. However, the nine closing reinforcing bars 32 on the side 31B of the long side are divided into three bars positioned in the center of the long side, and three bars arranged alternately in the width direction W or depth direction D with the three closing reinforcing bars 22 on the side 21 of the main precast member 20, and three bars on both sides of them arranged alternately in the width direction W or depth direction D with the three closing reinforcing bars 32 on the central widening precast member 40, with a small gap between them.

[0122] In this way, the auxiliary reinforcing bars 61 are arranged between the alternating closing reinforcing bars 22 and the closing reinforcing bars 32, or between the alternating closing reinforcing bars 32, and are shorter than the side length of the square-shaped main precast member 20 in plan view, as with the auxiliary reinforcing bars 61 used in the foundation structure 10 described above. Therefore, as shown in FIG. 16, the intersections where the four joints 60B intersect at the center form unreinforced sections where no auxiliary reinforcing bars 61 are arranged.

[0123] The foundation structure 10B configured in this manner and the shed structure 1B using the foundation structure 10B can achieve the same functions and effects as the foundation structure 10 and the shed structure 1 using the foundation structure 10 described above. Furthermore, the central widening precast member 40, which is arranged in the width direction W relative to the main precast member 20 and has a square shape when viewed from above, is formed with a width equal to the length in the depth direction D of the main precast member 20, and the rectangular widening precast member 50B, which is arranged in the depth direction D relative to the main precast member 20, has a length in the width direction W equal to the length in the width direction W of the main precast member 20, the two joint portions 60B, and the two central widening precast members 40.

[0124] Therefore, while reducing the number of widening precast members 30B, the widening precast members 30B can be arranged around the main precast member 20, which is square in plan view, without any gaps, and a highly rigid foundation structure 10B can be constructed.

[0125] (Fourth embodiment) Next, a shed structure 1C and a foundation structure 10C according to a fourth embodiment will be described with reference to FIGS. FIG. 17 is an explanatory diagram of a foundation structure 10C and a shed structure 1C according to the fourth embodiment, and FIGS. 18 and 19 are explanatory diagrams of the foundation structure 10C according to the fourth embodiment.

[0126] 17(a) shows a perspective view of the front, right side, and top of the shed structure 1C, and FIG. 17(b) shows a perspective view of the front, right side, and top of the foundation structure 10C. Note that in FIG. 17(a), the height adjustment member 4 that adjusts the position of the column member 2 in the height direction H and the roof member are not shown.

[0127] Fig. 18(a) shows a left side view of the foundation structure 10C, Fig. 18(b) shows a plan view of the foundation structure 10C, Fig. 18(c) shows a front view of the foundation structure 10C, and Fig. 18(d) shows a bottom view of the foundation structure 10C. Note that the back view of the foundation structure 10C appears the same as the front view, and the right side view of the foundation structure 10C appears the same as the left side view.

[0128] Fig. 19(a) is an exploded perspective view of the foundation structure 10C showing the front, right side, and top view, and Fig. 19(b) is a perspective view of the foundation structure 10C showing the front, right side, and top view, with the joint 60C omitted. Note that Fig. 19(b) does not show the auxiliary reinforcing bars 61C.

[0129] In the foundation structures 10, 10A, and 10B of the first to third embodiments described above, a rectangular pillar-shaped main precast member 20 is placed in the center of a square in plan view, and widening precast members 30, 30A, and 30B that constitute the widening portion 12 are placed around it. In contrast, the foundation structure 10C of the fourth embodiment is placed in the center in the width direction W but on the near side DF of the center in the depth direction D, and part of the widening portion 12 and the supporting body portion 11 are formed from the main precast member 20C.

[0130] Specifically, in the foundation structure 10C of the fourth embodiment, the joint 60C extending in the width direction W is positioned approximately in the center in the depth direction D, and the two joints 60C extending in the depth direction D are positioned at positions dividing the width direction W into thirds. The main precast member 20C is positioned approximately in the center in the depth direction D, closer to the front DF than the joint 60C extending in the width direction W. As shown in FIG. 19 , the main precast member 20C has an L-shaped shape in left side view, which comprises the support body 11 and a part of the widened portion 12 of the front DF of the support body 11. Therefore, the main precast member 20C has a rectangular shape in plan view that is longer in the depth direction D than in the width direction W. More specifically, the main precast member 20C has a rectangular shape in plan view, with a long side that is half the length in the depth direction D of the square-shaped foundation structure 10C in plan view and a short side that is slightly shorter than one-third the length in the width direction W.

[0131] Closing rebars 22 are provided on both sides in the width direction W and on the lower half HD in the height direction H of the side surface 21C of the rear DB. More specifically, five closing rebars 22 are arranged at intervals on the L-shaped side surface 21C when viewed from the left side on both sides in the width direction W, and three closing rebars 22 are arranged at intervals on the side surface 21C of the rear DB.

[0132] The widening precast members 30C that constitute the remaining part of the widening section 12 are arranged on both sides in the width direction W of the main precast member 20C, which is formed in an L-shape when viewed from the left side as described above, and at the rear DB of the joint portion 60C extending in the width direction W at approximately the center in the depth direction D.

[0133] More specifically, a central widening precast member 40C is arranged on the rear side DB of the above-mentioned main precast member 20C, and a total of four corner widening precast members 50C (50C1, 50C2) are provided on both sides of the main precast member 20C and the central widening precast member 40C in the width direction W.

[0134] In more detail, the central widening precast member 40C, which is placed on the rear DB side of the main precast member 20C, is composed of a short side with the same widthwise W length as the main precast member 20C and a long side that is slightly shorter than the depthwise D length of the main precast member 20C, and is formed into a rectangular shape in plan view with a shorter depthwise D length than the main precast member 20C.

[0135] Closing rebars 32 are provided on both sides in the width direction W and on the side surface 41C of the front DF. More specifically, four closing rebars 32 are arranged at intervals on the side surfaces 41C of the long sides on both sides in the width direction W, and three closing rebars 32 are arranged at intervals on the side surface 41C of the front DF, corresponding to the closing rebars 22 of the main precast member 20C.

[0136] Furthermore, of the four corner widening precast members 50C arranged on both sides of the width direction W of the main precast member 20C and the central widening precast member 40C, those arranged on both sides of the main precast member 20C are called first corner widening precast members 50C1, and those arranged on both sides of the central widening precast member 40C are called second corner widening precast members 50C2.

[0137] The first corner widening precast member 50C1 has the same rectangular shape in plan view as the main precast member 20C, and five closing reinforcing bars 32 are arranged at intervals on the side surfaces 51C of the long sides on both sides in the width direction W, corresponding to the closing reinforcing bars 22 of the main precast member 20C, and three closing reinforcing bars 32 are arranged at intervals on the side surface 51C of the rear DB.

[0138] The second corner widening precast member 50C2 has the same rectangular shape in plan view as the central widening precast member 40C, and on the side 51C of the inner long side in the width direction W, four closing reinforcing bars 32 are arranged at intervals corresponding to the closing reinforcing bars 32 of the central widening precast member 40C, and on the side 51C of the front DF, three closing reinforcing bars 32 are arranged at intervals corresponding to the three closing reinforcing bars 32 provided on the short side of the first corner widening precast member 50C1.

[0139] In addition, at the opposing parts of the main precast member 20C and the central widening precast member 40C, three closing reinforcing bars 22 and closing reinforcing bars 32 are arranged alternately in the width direction W, and at the short side parts of the first corner widening precast member 50C1 and the second corner widening precast member 50C2, three closing reinforcing bars 32 are arranged alternately in the width direction W, and the auxiliary reinforcing bars 61 arranged inside them are of the same length as the auxiliary reinforcing bars 61 in the other embodiments described above and are formed shorter than the short side length of the main precast member 20C, the central widening precast member 40C and the corner widening precast member 50C.

[0140] In contrast, five closing rebars 22 and 32 are arranged alternately in the depth direction D at the opposing long side portions of the main precast member 20C and the first corner widening precast member 50C1, and the auxiliary rebars 61C1 arranged inside them are formed to be one size shorter than the length in the depth direction D of the main precast member 20C and the first corner widening precast member 50C1.

[0141] Similarly, at the opposing long side portions of the central widening precast member 40C and the second corner widening precast member 50C2, four closing rebars 32 are arranged alternately in the depth direction D, and the auxiliary rebars 61C2 arranged inside them are formed to be slightly shorter than the length of the central widening precast member 40C and the second corner widening precast member 50C2 in the depth direction D. Therefore, the intersections where the joint portions 60C intersect form unreinforced portions where the auxiliary rebars 61, 61C1, 61C2 are not arranged. The foundation structure 10C configured in this manner and the shed structure 1C using the foundation structure 10C can achieve the same functions and effects as the foundation structure 10 and the shed structure 1 using the foundation structure 10 described above.

[0142] (Fifth embodiment) The foundation structures 10, 10A to 10C of the above-mentioned first to fourth embodiments each comprise one support main body portion 11 and an expansion portion 12 that is square in plan view, and the shed structures 1, 1A to 1C are formed by erecting column members 2 onto the support main body portion 11. However, for example, as shown in Figures 20 to 24, one foundation structure 10D, 10E may be provided with multiple support main body portions 11.

[0143] Note that Figure 20 shows an explanatory diagram of the foundation structure 10D and shed structure 1D of the fifth embodiment, Figure 21 shows an explanatory diagram of the foundation structure 10D of the fifth embodiment, and Figure 22 shows an exploded oblique view of the foundation structure 10D showing the front, right side, and plan views.

[0144] 20(a) is a perspective view showing the front, right side, and top of the shed structure 1D, and FIG. 20(b) is a perspective view showing the front, right side, and top of the foundation structure 10D. Note that in FIG. 20(a), the height adjustment members 4 that adjust the position of the column members 2 in the height direction H and the roof members are not shown.

[0145] Fig. 21(a) shows a left side view of the foundation structure 10D, Fig. 21(b) shows a plan view of the foundation structure 10D, Fig. 21(c) shows a front view of the foundation structure 10D, and Fig. 21(d) shows a bottom view of the foundation structure 10D. Note that the back view of the foundation structure 10D appears the same as the front view, and the right side view of the foundation structure 10D appears the same as the left side view.

[0146] Specifically, the shed structure 1D and foundation structure 10D of the fifth embodiment shown in Figures 20 to 22 have an expansion section 12D that is rectangular in plan view and longer in the width direction W than in the depth direction D, and two support main body sections 11 (main body precast members 20D) are provided at the center of the depth direction D, spaced a predetermined distance apart from the center of the width direction W toward the outside in the width direction W.

[0147] Between the main precast members 20D arranged at a predetermined interval in the width direction W, that is, at the center in the width direction W and depth direction D of the widening portions 12D that are rectangular in plan view and longer in the width direction W than in the depth direction D, there is a central precast member 70 that is rectangular in plan view and slightly shorter in the width direction W than the main precast members 20D, and central widening precast members 40D are provided outside the width direction W of the main precast members 20D and on both sides in the depth direction D of the main precast members 20D and the central precast member 70, and further, corner widening precast members 50D are provided at the corners of the widening portions 12D that are rectangular in plan view. Therefore, a lattice pattern is formed by four joint portions 60D extending in the depth direction D and two joint portions 60D extending in the width direction W.

[0148] In a foundation structure 10D in which the widening portion 12D configured in this manner is formed from widening precast members 30D (40D, 50D, 70), the auxiliary reinforcing bars 61D are formed to a length shorter than the side length of the precast members 20, 30D that face each other in the width direction W or the depth direction D, as shown in Figure 22. Therefore, the intersections of the four joint portions 60D extending in the depth direction D and the two joint portions 60D extending in the width direction W that form a lattice pattern form unreinforced portions where no auxiliary reinforcing bars 61D are placed. The foundation structure 10D configured in this manner and the shed structure 1D using the foundation structure 10D can achieve the same functions and effects as the foundation structure 10 and the shed structure 1 using the foundation structure 10 described above.

[0149] (Sixth embodiment) Furthermore, as shown in Figures 23 and 24, as in the sixth embodiment of the shed structure 1E and foundation structure 10E, two support main body parts 11 (main body precast members 20E) may be provided at a predetermined distance from the center of the depth direction D and further from the center of the width direction W toward the outside of the width direction W, for an expansion section 12E that is rectangular in plan view and longer in the width direction W than in the depth direction D, for a total of three support main body parts 11 (main body precast members 20E).

[0150] FIG. 23 is an explanatory diagram of a foundation structure 10E and a shed structure 1E according to the sixth embodiment, and FIG. 24 is an explanatory diagram of the foundation structure 10E according to the sixth embodiment. 23(a) is a perspective view showing the front, right side, and top of the shed structure 1E, and FIG. 23(b) is a perspective view showing the front, right side, and top of the foundation structure 10E. Note that in FIG. 23(a), the height adjustment member 4 that adjusts the position of the column member 2 in the height direction H and the roof member are not shown.

[0151] Fig. 24(a) shows a left side view of the foundation structure 10E, Fig. 24(b) shows a plan view of the foundation structure 10E, Fig. 24(c) shows a front view of the foundation structure 10E, and Fig. 24(d) shows a bottom view of the foundation structure 10E. Note that the back view of the foundation structure 10E appears the same as the front view, and the right side view of the foundation structure 10E appears the same as the left side view.

[0152] As such, the foundation structure 10E equipped with three supporting main body portions 11 (main body precast members 20E) has the same configuration as the foundation structure 10D of the above-mentioned fifth embodiment, and therefore its description will be omitted, but it can achieve the same effects as the foundation structure 10D of the above-mentioned fifth embodiment and the shed structure 1D using the foundation structure 10D.

[0153] As described above, in the correspondence between the configuration of the present invention and the above-mentioned embodiment, the support member of the present invention corresponds to the column member 2, Similarly, The upper structure corresponds to upper structure 1, 1A to 1E, The foundation structures correspond to the foundation structures 10, 10A to 10E, The support body corresponds to the support body 11, The widened sections correspond to the widened sections 12, 12D, and 12E. The main body precast members correspond to the main body precast members 20, 20C to 20E, The widening precast members correspond to the widening precast members 30, 30A to 30D, The opposing surfaces correspond to the side surfaces 21, 21C, 31, 31A, and 31B. The closing projecting bars correspond to closing bars 22 and 32. The joint part corresponds to joint part 60, 60A to 60D, The longitudinal direction corresponds to the width direction W or the depth direction D, The auxiliary reinforcing bars correspond to auxiliary reinforcing bars 61, 61C1, 61C2, and 61D. The joint hardening material corresponds to grout hardening body 62, The cross joint portion corresponds to the intersection portion of the joint portions 60, 60A to 60D, The horizontal direction corresponds to the width direction W, The vertical direction corresponds to the depth direction D, The width-widening precast members correspond to the width-widening precast members 30B and the corner width-widening precast members 50C. The main body precast member placement process and the widening precast member placement process correspond to the precast member installation process (step s5), The auxiliary rebar placement process corresponds to the auxiliary rebar placement process (step s6), The joint portion construction step corresponds to the joint portion construction step (step s8), but is not limited to the above embodiment.

[0154] For example, in the above-mentioned foundation structures 10, 10A to 10E, anchor bolts 111 are provided at the corners of the upper surface of the main precast member 20 that constitutes the support main body portion 11, but this is not limited to this and they may be arranged in any suitable manner, such as a triangular arrangement or diagonal arrangement, and the length and diameter may also be arranged in any suitable size.

[0155] Furthermore, the closing reinforcing bars 22 and 32 are formed in a rectangular U-shape extending horizontally from the side surfaces 21 and 31, but may also be formed in a U-shape. Furthermore, four auxiliary reinforcing bars 61 are arranged inside each of the closing reinforcing bars 22 and 32, but the number may be four or more or four or less.

[0156] Furthermore, if the opposing closing bars 22, 32, or the closing bars 32, are arranged alternately along the width direction W or the depth direction D, they may be arranged close to each other as shown in the figure, or they may be arranged at equal intervals with a predetermined gap between them.

[0157] In the above description, the column member 2 is made of an H-shaped steel, but it may also be made of an L-shaped steel, a C-shaped steel, a square steel pipe, a circular steel pipe, a pole, or the like. In the above description, the upper surfaces of the main precast members 20 (20C to 20E) constituting the support body 11 were formed to be higher than the upper surfaces of the widening precast members 30 (30A to 30D) constituting the widening portion 12, but the upper surfaces of the main precast members 20 (20C to 20E) and the upper surfaces of the widening precast members 30 (30A to 30D) constituting the widening portion 12 may be formed to be flush, i.e., at the same height. In the above description, about half of the support body 11 protruding beyond the widening portion 12 was backfilled with backfill soil 110 together with the widening portion 12, but the excavated recess 100 may be backfilled to a height that buries the lower ends of the pillar members 2 in addition to the support body 11.

[0158] Furthermore, instead of the grout hardened body 62 made of a grout material having a predetermined strength, it may be made of mortar, concrete, or hardening resin. Furthermore, the above explanation has been given of a shed structure 1 (1A to 1E) equipped with a main precast member 20 (30C to 20E), but it may also be a fence equipped with supports (support members) such as poles, ancillary equipment such as a fan, louvers or bench, exterior construction, or even a shed equipped with structural walls (support members). [Explanation of symbols]

[0159] 1,1A~1E…Upper structure 2...Column member 10, 10A to 10E...Foundation structure 11...Support body part 12, 12D, 12E... Widened section 20, 20C~20E...Main body precast members 21,21C,31,31A,31B...Side 22, 32...Closed bars 30, 30A to 30D... Widened precast members 50C... Corner widening precast member 60, 60A to 60D...Joint 61, 61C1, 61C2, 61D...Auxiliary rebar 62...hardened grout W: Width direction D: Depth direction Step s5: Precast member installation process Step s6: Reinforcement of auxiliary rebars Step s8: Construction of the joint

Claims

1. a support body portion having a support member attached to an upper surface thereof to support the load of the structure; The support body is widened and an expanded portion is embedded in the installation location. The support body is a block-shaped precast body member made of precast reinforced concrete, The widening portion is a block-shaped precast reinforced concrete structure, and is composed of a plurality of widening precast members arranged around the support body and embedded in the installation location; The main precast member and the widened precast member are provided with closed protruding reinforcing bars on the opposing surfaces of the main precast member and the widened precast member, and on the opposing surfaces of the widened precast members. Joints are formed at predetermined intervals between the main precast member and the widening precast member, and between the widening precast members; The joint portion is The closing protruding reinforcing bars protruding from each of the opposing surfaces are arranged alternately along a longitudinal direction perpendicular to the opposing direction, Auxiliary reinforcing bars along the longitudinal direction are arranged inside the closing protruding reinforcing bars arranged alternately along the longitudinal direction; A joint hardening material is filled between the opposing surfaces so that the closing protruding rebar is contained therein, and hardened. Basic structure.

2. The auxiliary reinforcing bar is The joints are formed to a length that is not disposed at the cross joints where the joints intersect with each other. The substructure according to claim 1 .

3. The main precast member is formed to be taller than the widening precast member. The substructure according to claim 1 .

4. The main precast member and the widening precast member are rectangular in plan view. The substructure according to claim 1 .

5. The main body precast member has a square shape in plan view. The substructure according to claim 1 .

6. The widening precast members are arranged in the horizontal and vertical directions in plan view so as to face each side of the main precast member, which is square in plan view. The base structure according to claim 5 .

7. The widening precast members are arranged in a diagonal direction intersecting the horizontal and vertical directions in a plan view with respect to the main precast member, which is square in plan view. The substructure according to claim 6 .

8. With respect to the main precast member having a square shape in plan view, one of the horizontal and vertical directions in plan view is defined as one direction, and the other direction is defined as the other direction; The widening precast member arranged in the one direction relative to the main precast member is a same-width widening precast member formed to have the same width as the length of the main precast member in the other direction, The widening precast member arranged in the other direction relative to the main precast member is The length in one direction is The main precast member, the two joint portions, and the two same-width widened precast members are formed to have the same length in one direction. The base structure according to claim 5 .

9. With respect to the main precast member having a square shape in plan view, one of the horizontal and vertical directions in plan view is defined as one direction, and the other direction is defined as the other direction; The widening precast member arranged in one direction relative to the main precast member is The length in one direction is The main precast member, the joint portion, and the widening precast member arranged in the other direction are formed to have a length equal to the length in the one direction. The base structure according to claim 5 .

10. The joint is set to a width that allows an operator to insert his / her hand and a depth that allows him / her to work. The substructure according to any one of claims 1 to 9.

11. The widening precast member in the foundation structure according to any one of claims 1 to 9 is buried in an installation location, The support member is attached to the upper surface of the support body. structure.

12. The widening precast member in the foundation structure according to any one of claims 1 to 9 is buried in an installation location, The support member is attached to an upper surface of the support body, A roofing material is provided on the top of the support member. Upper house structure.

13. a support body portion having a support member attached to an upper surface thereof to support the load of the structure; The support body is widened and an expanded portion is embedded in the installation location. a main body precast member placement process in which a main body precast member, which is a block-shaped precast reinforced concrete member constituting the support main body portion, is placed at the excavated installation location; a widening precast member placement process in which a plurality of widening precast members, each of which is a block-shaped member made of precast reinforced concrete and which constitutes the widening portion, are placed around the excavated installation location at a predetermined interval from the main precast member; an auxiliary reinforcing bar arrangement process in which reinforcing bars are provided on the opposing surfaces of the main precast member and the widened precast member, and on the opposing surfaces of the widened precast members, and the reinforcing bars inside the reinforcing bars protrude toward each other, and closed protruding reinforcing bars are arranged alternately along a longitudinal direction perpendicular to the facing direction, and auxiliary reinforcing bars are arranged along the longitudinal direction inside the closed protruding reinforcing bars arranged alternately along the longitudinal direction; A joint forming process is performed in which a joint hardening material is filled between the opposing surfaces at the predetermined interval so that the closing protruding reinforcing bar is contained therein, and the joint hardening material is hardened to form a joint. How to build the foundation structure.

14. The auxiliary reinforcing bar is The joints are formed to a length that is not disposed at the cross joints where the joints intersect with each other. A method for constructing a substructure according to claim 13.

15. The support member is attached to the upper surface of the support body of the foundation structure constructed by the foundation structure construction method according to claim 13 or 14. How to build a structure.

16. The support member is attached to an upper surface of the support body portion of the foundation structure constructed by the method for constructing a foundation structure according to claim 13 or 14, and Attach the roofing material to the top of the support member. How to build a superstructure.

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