Building Foundations

Abstract

To mainly facilitate one-time installation of a slab part of a mat foundation.SOLUTION: The present invention relates to a foundation structure for a building 1 having: an outer peripheral rising part 5 rising along an outer periphery of the building 1; and a flat slab part 6 provided inside the outer peripheral rising part 5. A precast concrete bundle member 21 manufactured in advance is placed on a top surface 6a of the installed slab part 6. For example, the precast concrete bundle member 21 is a bundle for a structure which supports a vertical load of the building 1 and a bundle (B) for vibration isolation which performs vibration isolation by receiving a transverse tension load applied on the building 1 and transmitting it to the slab 6.SELECTED DRAWING: Figure 8

Description

[Technical field]

[0001] This invention relates to the foundation structure of a building. [Background technology]

[0002] The lower part of a building such as a house is supported on the ground by a foundation. An example of the foundation structure (foundation structure) of such a building is a slab foundation. A slab foundation has at least a perimeter rising part that rises along the perimeter of the building, and a flat slab part provided inside the perimeter rising part. Inside the slab part, a rising part (for example, an inner rising part) separate from the perimeter rising part is required to support the lower part of the building (the floor girder provided on it).

[0003] The inner rising part is cast and formed at the same time as the outer perimeter rising part and the slab part, and has approximately the same height as the outer perimeter rising part, and extends to divide the inside of the slab part into several parts. It is also known, for example, in Patent Document 1, to embed a prefabricated precast concrete beam member in the slab part as a separate rising part, instead of the inner rising part that is integrated with the slab foundation. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 10-195877 Summary of the Invention [Problem to be solved by the invention]

[0005] In conventional slab foundations, the inside rising part of the slab foundation is formed simultaneously and integrally with the outer rising part and the slab part when concrete is poured. Therefore, when pouring the slab part in one go, workers have to enter the inside of the slab foundation before the concrete hardens in order to adjust the position and height of the inside rising part of the slab foundation. Therefore, pouring the slab part in one go was not easy.

[0006] In contrast, in the building foundation structure described in Patent Document 1 above, pre-fabricated precast concrete beam members were embedded in the slab when pouring the concrete for the slab foundation, and integrated with it. This resulted in problems such as the time-consuming task of adjusting the position and height of the precast concrete beam members when pouring the concrete.

[0007] Therefore, a main object of the present invention is to contribute to improving the above-mentioned problems. [Means for solving the problem]

[0008] In response to the above problems, the present invention provides: A perimeter rising part that rises along the perimeter of the building and a flat slab part provided inside the perimeter rising part. was cast into the ground as a single unit. A foundation structure for a building, comprising: A precast concrete bundle member is placed on the upper surface of the poured slab portion, The precast concrete beams serve as a structural member that supports the vertical load of the building, and also as a support for the lateral tensile load acting on the building, transmitting it to the slab section. for the lateral displacement of the building It is used as a vibration-proof bundle to provide vibration isolation. And, The precast concrete beam member has an insert member integrally formed on at least one of the top surface and the side surface for attaching a vibration-proof metal fitting, The precast concrete beam supports the vertical load of the building from below at the center of the floor girder of the building, and is connected to the building with the vibration-proof metal fittings attached to the insert member clamping the center of the floor girder, and is fastened and fixed to the slab portion by post-installed anchors. It is characterized by: Effect of the Invention

[0009] According to the present invention, with the above configuration, By placing a pre-fabricated precast concrete beam on top of the slab, it becomes a separate rising part of the mat foundation. This makes it easier to pour the slab part of a solid foundation in one go. The precast concrete beams function as structural beams to support the vertical load of the building from below at the center of the building's floor girder. At the same time, the precast concrete beams function as vibration-proof beams, connected to the building with the center of the building's floor girder sandwiched between vibration-proof metal fittings, and receive and transmit the lateral tensile load acting on the building to the slab, thereby isolating the building from vibration against lateral displacement. [Brief description of the drawings]

[0010] [Figure 1] FIG. 1 is a perspective view of a building equipped with a foundation structure according to this embodiment. [Diagram 2]This is a perspective view of a building unit that makes up a building (unit building). [Diagram 3] FIG. 2A is a plan view of the slab foundation of FIG. 1 in the first embodiment, and FIG. 2B is a longitudinal sectional view of the slab foundation of FIG. [Figure 4] 3(b) is a side view of the precast concrete beam member in FIG. 3(b), and FIG. 3(b) is a side view of the steel beam member in FIG. 3(b). [Diagram 5] (a) is a side view of a precast concrete beam member with a spacer, and (b) is a top view of (a). [Figure 6] (a) is a side view of a precast concrete beam member with another spacer, and (b) is a top view of (a). [Figure 7] (a) is a side view of a precast concrete beam member with another spacer, and (b) is a top view of (a). [Figure 8] FIG. 11 is a vertical cross-sectional view of a slab foundation in Example 2. [Figure 9] 9(a) is a side view of the precast concrete beam member of FIG. 8, and (b) is a side view of the vibration-isolating member of FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] Hereinafter, the present embodiment will be described in detail with reference to the drawings. 1 to 9 are intended to explain this embodiment. EXAMPLES

[0012] <Configuration> The configuration of this embodiment will now be described.

[0013] As shown in Fig. 1, in order to support a building 1 such as a house on the ground 2, a foundation 3 is provided on the ground 2. The structure (foundation structure) of the foundation 3 of this building 1 is referred to as a slab foundation 4. The slab foundation 4 has at least a perimeter rising portion 5 that rises along the perimeter of the building 1, and a flat slab portion 6 (Fig. 3) provided inside the perimeter rising portion 5.

[0014] Here, the building 1 may be of any type, but in this embodiment, it is a unit building. A unit building is a building 1 that can be constructed in a short period of time by transporting building units 7 manufactured in advance at a factory to a construction site and assembling the building units 7 on a foundation 3 that has been formed in advance at the construction site. In this embodiment, the unit building is a building 1 of a size in which four building units 7 are installed lined up in the short side direction on the lower floor. However, the configuration of the unit building is not limited to this.

[0015] The building unit 7 is substantially rectangular. There are steel-framed and wood-framed building units 7. As shown in Fig. 2, the steel-framed building unit 7 has a box-framed unit frame 14 in its framework, in which the upper ends of four columns 11 are connected in a rectangular shape by four ceiling beams 12, and the lower ends of the four columns 11 are connected in a rectangular shape by four floor beams 13.

[0016] For example, a metal square tubular member is used for the pillar 11. For example, an inward C-shaped cross-section steel is used for the floor girder 13, which has a pair of horizontal flanges 16, 17 integrally formed with the upper and lower ends of a vertical web portion 15 and parallel to each other. The upper and lower flanges 16, 17 are substantially the same. For the ceiling beam 12, an inward C-shaped cross-section steel similar to that of the floor girder 13 is used. The pillar 11 is joined to the ceiling beam 12 and floor girder 13 by welding via joint pieces.

[0017] The ground 2 is the site on which the building 1 is to be constructed. The foundation 3 is provided on the ground 2 in order to support the lower part of the building 1 on the ground 2. A slab foundation 4 is one type of foundation 3. In addition to the slab foundation 4, the foundation 3 also includes a strip foundation that has almost only a rising portion without a slab portion 6.

[0018] As shown in FIG. 3, the outer perimeter rising portion 5 is an outer frame portion of the foundation 3 formed higher than the ground 2 and the slab portion 6 in order to support the building 1 at a position higher than the ground 2. The outer perimeter rising portion 5 has a required width and is provided in a continuous state so as to substantially follow the periphery of the building 1. The outer perimeter rising portion 5 supports the outer perimeter portion of the building 1 (the position of the outer wall portion) at its upper end. Anchor bolts for fixing the building 1 and positioning pins for positioning the building 1 are provided upwardly at the upper end of the outer perimeter rising portion 5. In addition, concrete floors 18a to 18c that will become the approach to the entrance or back door or the entrance floor are provided integrally with the outer perimeter rising portion 5 and the slab portion 6 on the outside or inside of the outer perimeter rising portion 5 as necessary.

[0019] The slab portion 6 is a flat portion provided inside the outer perimeter rising portion 5 so as to cover the entire ground 2 surrounded by the outer perimeter rising portion 5. The slab portion 6 is formed in a shape that is a planar projection of the main body of the building 1. An underfloor space 19 is formed between the slab portion 6 and the lower part of the building 1 placed on the outer perimeter rising portion 5 (the floor part of the lower floor).

[0020] In addition to the basic configuration described above, this embodiment can have the following configuration.

[0021] (1a) In this embodiment, a bundle member 21 made of precast concrete is placed on an upper surface 6a of a poured slab portion 6.

[0022] Here, the "cast slab portion 6" means that the slab portion 6 is already in a completed state before the installation of the precast concrete beam members 21. In this embodiment, the slab portion 6 is a surface surrounded by the outer peripheral rising portion 5.

[0023] The "upper surface 6a of the slab portion 6" is basically a single continuous horizontal surface on the inside, without anything on the inside that divides the underfloor space 19 into multiple parts, such as an inner rising portion integral with the mat foundation 4, which has approximately the same height as the outer periphery rising portion 5. This makes it easier to inspect the underfloor area, and makes it possible to install underfloor equipment without interfering with the inner rising portion. As described above, in the case where a structure such as the above-mentioned concrete floor 18c is partially provided on the inside of the outer periphery rising portion 5, the upper surface 6a of the slab portion 6, except for the concrete floor 18c, becomes a continuous, approximately horizontal surface at approximately the same height.

[0024] The precast concrete bundle members 21 are bundles (concrete bundles) manufactured using concrete at a location other than the site as separate members from the slab foundation 4 (the slab portion 6 and the outer perimeter rising portion 5). The precast concrete bundle members 21 are solid. The precast concrete bundle members 21 may have reinforcing materials such as steel bars placed inside. The precast concrete bundle members 21 basically have upper and lower end surfaces that are approximately horizontal and flat. The precast concrete bundle members 21 are finished with high precision by being manufactured at a location other than the site.

[0025] The precast concrete bundle members 21 are installed inside the outer perimeter rising portion 5 (and the slab portion 6) as a separate rising portion in place of the inner rising portion that is integral with the slab foundation 4. The inner rising portion has approximately the same height as the outer perimeter rising portion 5 and is continuous so as to divide the underfloor space 19 into multiple spaces, whereas the precast concrete bundle members 21 are partially scattered on the upper surface 6a of the slab portion 6 and do not divide the underfloor space 19. The concrete members installed in place of the inner rising portion as a separate rising portion are only the precast concrete bundle members 21, and the precast concrete bundle members 21 are installed inside the slab portion 6 of the slab foundation 4 in a limited state (in terms of number and position) and in a minimum number.

[0026] The beam members (or beams) are short columns that are partially installed between the upper surface 6a of the slab portion 6 and the lower part of the building 1 in place of the inner rising part, and support the lower part of the building 1 (the floor girder 13) on the slab portion 6. The beam members are basically formed at approximately the same height as the underfloor space 19 (the height to the lower flange parts 16 of the floor girder 13 that constitute it). The precast concrete beam members 21 are preferably in the form of a rectangular column with equal cross-sectional shapes at the top and bottom, or a pyramid that narrows at the top.

[0027] The statement that the precast concrete bundle member 21, which has been manufactured in advance, is placed on the upper surface 6a of the slab portion 6 means that the precast concrete bundle member 21 is placed on the flat upper surface 6a of the slab portion 6. The precast concrete bundle member 21 is installed in a state where its lower portion is not embedded in the slab portion 6. The flat lower end surface of the precast concrete bundle member 21 is directly or indirectly abutted against the flat upper surface 6a of the slab portion 6. As a result, the lower end of the precast concrete bundle member 21 is positioned at the same position as or higher than the upper surface 6a of the slab portion 6.

[0028] (1b) As shown in FIG. 4, a precast concrete beam member 21 may be used as a structural beam (A). Additionally, on the upper surface 6a of the slab portion 6, a steel beam 31 may be placed separately as a vibration-proof beam.

[0029] Here, the structural beams (A) are beams for supporting the structure (or vertical load) of the building 1. Also, the vibration isolation beams are beams for receiving the lateral tensile load acting on the building 1 and transmitting it to the slab portion 6, thereby isolating vibration.

[0030] The steel bundle 31 is a metal bundle. The steel bundle 31 is provided as a separate member from the precast concrete bundle member 21. The steel bundle 31 is a rod-shaped or tubular body extending approximately vertically. The steel bundle 31 is basically formed at approximately the same height as the underfloor space 19. The steel bundle 31 is mainly composed of a rod-shaped or tubular steel bundle body 32. The steel bundle 31 is lighter and more rigid than the precast concrete bundle member 21, making it an optimal bundle for vibration isolation. In addition, the steel bundle 31 is relatively low cost, easy to handle, and can be constructed with high accuracy. The steel bundles 31 are provided inside the slab portion 6 of the mat foundation 4 in a limited state (in terms of number and position) and in a minimum number.

[0031] The precast concrete beam members 21 and the steel beams 31 are provided separately to serve structural and vibration isolation functions, and are used in appropriate combination to provide a good balance between both functions.

[0032] (2) As shown in FIG. 3, the precast concrete beam member 21 may be disposed in the center portion 41 of the floor girder 13 of the building 1 without being connected to the building 1 .

[0033] Here, the state where it is not connected to the building 1 means that the building 1 is simply placed on the precast concrete beam member 21, or the lower part of the building 1 is only in contact with the top of the beam member 21 (the edge is cut). Therefore, the building 1 is able to displace laterally with respect to the precast concrete beam member 21.

[0034] The floor girder 13 is the largest of the structural materials constituting the lower part (of the floor of the lower floor provided in) of the building 1. In the case of the building unit 7, the floor girder 13 of the unit frame 14 of the lower floor is used as it is as a structural material for the floor of the lower floor.

[0035] The central portion 41 of the floor girder 13 is approximately the center in the extension direction 42 (or longitudinal direction) of the floor girder 13 or a portion therearound. It is preferable to install the precast concrete beam member 21 at the center of the floor girder 13, but depending on the configuration of the building 1 (or the building unit 7), it may be better to slightly shift the center from the center of the floor girder 13, so in this embodiment, the central portion 41 of the floor girder 13 is approximately the center or a portion therearound.

[0036] In the case of a rectangular parallelepiped building unit 7, there are two types of floor girders 13 with different lengths along the long and short sides of the building unit 7, but the floor girders 13 to which the precast concrete beam members 21 are attached may be either as long as the central portion 41 is located inside the slab portion 6. In this embodiment, only one precast concrete beam member 21 is provided at the central portion 41 in the extension direction 42 of the floor girders 13 on the long side of the building unit 7, so that the central portion 41 of each floor girder 13 located inside the slab portion 6 is supported from below.

[0037] In this embodiment, the precast concrete beam members 21 are provided at each of the three joints where the four building units 7 on the lower floor are adjacent, so as to simultaneously support the central portions 41 of the adjacent floor girders 13 of the adjacent building units 7 from below.

[0038] For this reason, as shown in Fig. 4(a), the horizontal dimension 43 (in this embodiment, the width dimension in the direction perpendicular to the extension direction 42 of the floor girder 13) of the precast concrete beam member 21 is at least larger than the gap 44 formed between adjacent floor girder 13. This horizontal dimension 43 is preferably approximately the same as or narrower than the sum of the width 45 of the two lower flange portions 17 of the adjacent floor girder 13 and the above-mentioned gap 44. In this embodiment, the horizontal dimension 43 is approximately the same as or slightly larger than the width 45 of one of the lower flange portions 17 of the floor girder 13, so that the two lower flange portions 17 of the adjacent floor girder 13 are supported approximately evenly.

[0039] Furthermore, as shown in FIG. 3(b), the vertical dimension 46 of the precast concrete beam member 21 (in this embodiment, this refers to the width dimension in the extension direction 42 of the floor girder 13) is approximately the same as the horizontal dimension 43 described above.

[0040] Therefore, the cross-sectional shape of the precast concrete bundle member 21 is approximately square, or approximately octagonal (close to a square) with each corner of the square shape rounded off (Fig. 5). By making it this size, the weight of the precast concrete bundle member 21 can be reduced, the cost of the precast concrete bundle member 21 can be reduced, and the handleability can be improved and it can be installed with high precision.

[0041] The height of the precast concrete bundle members 21 may be slightly lower than the height of the underfloor space 19, and one or more spacers 47 may be inserted between the precast concrete bundle members 21 to adjust the height. The spacers 47 may be made of metal plates, resin plates, rubber plates, or the like. When a metal plate is used for the spacer 47, a corrosion-resistant material is used for the metal plate. The spacers 47 may be attached to the precast concrete bundle members 21 in advance, or may be attached to the precast concrete bundle members 21 after the precast concrete bundle members 21 are installed on the slab portion 6.

[0042] The spacer 47 can be attached to the upper side of the upper end surface of the precast concrete bundle member 21 as shown in Figures 5 and 6, or can be attached to the lower side of the lower end surface of the precast concrete bundle member 21 as shown in Figure 7. The spacer 47 is fixed to the precast concrete bundle member 21 with adhesive 48 (Figures 5 and 7) or adhesive tape 49 (Figure 6) such as acrylic tape.

[0043] Basically, the spacer 47 is made to have a size and shape that is approximately the same as or slightly smaller than the upper end surface of the precast concrete bundle member 21 (FIG. 5). However, when the spacer 47 is attached to the lower side of the lower end surface of the precast concrete bundle member 21, it is preferable that the spacer 47 is made slightly larger than the lower end surface of the precast concrete bundle member 21 so that the precast concrete bundle member 21 is stable (FIG. 7). When the spacer 47 is attached with an adhesive tape 49, it is preferable that the spacer 47 is formed to have approximately the same width as the adhesive tape 49 so that it fits within the width dimension of the adhesive tape 49 (FIG. 6). In this case, the adhesive tape 49 used has a width larger than the gap 44 between adjacent floor girders 13. The adhesive tape 49 may be attached in either direction, but in this embodiment, it is attached toward the extension direction 42 of the floor girders 13.

[0044] The lower end faces of the precast concrete beam members 21 are directly or indirectly fixed to the upper surface of the slab portion 6 with adhesive 48. In this way, the precast concrete beam members 21 are fixed to the slab portion 6, and are not fixed to the floor girder 13.

[0045] (3) As shown in FIG. 4(b), the steel beam 31 is connected to the floor girder 13 of the building 1 by sandwiching the floor girder 13 with vibration-proof metal fittings 51, and may also be fastened to the slab portion 6 by post-installed anchors 52.

[0046] Here, the vibration-isolating metal fittings 51 are metal members for receiving lateral tensile loads acting on the building 1. The vibration-isolating metal fittings 51 are intended to sandwich and fix the floor girder 13 from above and below. The vibration-isolating metal fittings 51 are provided at the upper end portions of the steel beams 31.

[0047] For this purpose, a bolt member 53 is provided at the upper end portion of the steel beam 31 so as to protrude upward, and a receiving plate 54 and a push plate 55 are disposed above and below the bolt member 53 in a state in which they pass through.

[0048] The bolt member 53 extends upward from the upper end of the steel bundle 31 (steel bundle body 32) with a length that protrudes upward beyond the upper flange portion 16 of the floor girder 13. The support plate 54 abuts against the lower part of the lower flange portion 17 of the floor girder 13 from below. The push plate 55 abuts against the upper part of the upper flange portion 16 of the floor girder 13 from above.

[0049] The support plate 54 is installed in a substantially fixed state on the upper end side of the steel bundle 31 (steel bundle main body 32), and the push plate 55 is installed above the support plate 54 so as to be displaceable up and down while being loosely fitted into the bolt member 53. Then, by screwing the nut member 56 into the bolt member 53 from above the push plate 55, the push plate 55 is brought close to the support plate 54, and the floor girder 13 is sandwiched and fixed from above and below between the push plate 55 and the support plate 54, and the floor girder 13 is connected and fixed to the steel bundle 31.

[0050] The post-installed anchors 52 may be, for example, bolts and screws. The steel bundles 31 are fixed to the slab section 6 by placing a substantially horizontal mounting plate 57 at the lower end of the steel bundles 31 in contact with the upper surface 6a of the slab section 6 from above, and then attaching the post-installed anchors 52 downward from above between the mounting plate 57 and the slab section 6. In this way, the steel bundles 31 are fixed to both the slab section 6 and the floor girder 13.

[0051] The height of the steel bundle 31 from the mounting plate 57 to the receiving plate 54 is approximately the same as the height of the underfloor space 19. However, the steel bundle 31 may be made height adjustable. The height-adjustable steel bundle 31 can be obtained, for example, by screwing reverse-threaded members (bolt member 53 and lower screw 58) that are reverse threaded to each other into the upper end and lower end (screw holes or nut-shaped members provided therein) of the cylindrical steel bundle main body 32 to form a turnbuckle-shaped member.

[0052] In this case, the height of the steel bundle main body 32 is made slightly lower than the underfloor space 19, the receiving plate 54 is attached to the lower end of the bolt member 53, and the mounting plate 57 is attached to the lower end of the lower screw 58, making it possible to change the height of the receiving plate 54 and the mounting plate 57 relative to the steel bundle main body 32. The receiving plate 54 can be attached to the lower end of the bolt member 53, and the mounting plate 57 can be attached to the lower end of the lower screw 58, for example, by welding, screwing, caulking, or the like.

[0053] In this embodiment, the steel beam 31 simultaneously supports two adjacent floor girders 13 of adjacent building units 7. For this purpose, the bolt members 53 are passed through the gaps 44 between the adjacent floor girders 13, and are long enough to protrude above the upper flange portions 16 of the floor girders 13.

[0054] The backing plate 54 has a size spanning the two lower flange portions 17 of adjacent floor girder 13, and is simultaneously abutted in an almost uniform state against the lower portions of the two flange portions 17. In this embodiment, the backing plate 54 is almost the same as or slightly smaller than the dimension obtained by adding the width 45 of the two lower flange portions 17 of the adjacent floor girder 13 and the gap 44 formed between the two lower flange portions 17 of the adjacent floor girder 13. However, the size of the backing plate 54 is not limited to the above.

[0055] The push plate 55 has a size spanning two upper flange portions 16 of adjacent floor girder 13, and is simultaneously abutted in a substantially uniform state against the upper portions of the two flange portions 16. In this embodiment, the push plate 55 has a size substantially equal to the width 45 of one of the upper flange portions 16 of the floor girder 13. However, the size of the push plate 55 is not limited to the above.

[0056] Then, by screwing nut members 56 onto bolt members 53 from above push plate 55, push plate 55 is brought close to receiving plate 54, and adjacent floor girders 13 are simultaneously clamped and fixed from above and below.

[0057] Furthermore, as shown in Figure 3, two steel beams 31 are installed in total, on both sides of the precast concrete beam member 21 (in the extension direction 42 of the floor girder 13) at positions relatively close to the precast concrete beam member 21.

[0058] The installation position of each steel bundle 31 relative to the precast concrete bundle member 21 is preferably within a range of approximately 1 / 2 to 1 / 5 of the distance 59 between the center of the precast concrete bundle member 21 (for example, the position of the central portion 41) and the outer surface of the outer periphery rising portion 5. In this way, by arranging the steel bundles 31 near the precast concrete bundle members 21, it becomes possible to widely use the underfloor space 19.

[0059] Furthermore, the arrangement and number of precast concrete beam members 21 and steel beams 31 used along the extension direction 42 of the floor girder 13 is optimally as described above, but is not necessarily limited to the above and can be changed or increased depending on the specific conditions of the building 1.

[0060] <Function> The function of this embodiment will now be described.

[0061] A building 1, such as a house, has its lower part supported on the ground 2 by a foundation 3. Concrete is poured into the ground 2 to form a perimeter rising portion 5 that rises along the perimeter of the building 1, and a flat slab portion 6 inside the perimeter rising portion 5, thereby forming a slab foundation 4 on which the building 1 is to be installed. After the slab foundation 4 has been poured, the building 1 is installed on the perimeter rising portion 5.

[0062] When the foundation 3 is a slab foundation 4, the building 1 is supported at a position along the exterior wall by the perimeter rising portion 5. If the slab portion 6 of the slab foundation 4 is one continuous flat surface without any protruding parts or partitions, then a separate rising portion (from the perimeter rising portion 5) is required inside the perimeter rising portion 5 to support the floor girders 13 provided on the inside of the building 1. In the case of a unit building, the separate rising portion is installed at a position where adjacent building units 7 join (where the floor girders 13 are adjacent to each other).

[0063] In this embodiment, at least a precast concrete beam member 21 is installed on the slab portion 6 as a separate rising portion, instead of the inner rising portion integral with the mat foundation 4. In this case, the separate rising portion is made up of the precast concrete beam member 21 and the steel beam 31.

[0064] Then, with the precast concrete beam members 21 and steel beams 31 placed inside the slab 4 , the building units 7 that make up the building 1 are placed on top of the slab 4 .

[0065] <Effects> According to this embodiment, the following effects can be obtained.

[0066] (Effect 1a) In the foundation structure of the building 1 of this embodiment, a precast concrete bundle member 21 manufactured separately in advance is placed on the upper surface 6a of the poured slab portion 6. As a result, after the slab portion 6 is poured, a separate rising portion (center bundle) for supporting the floor girders 13 of the building 1 can be easily provided inside the outer periphery rising portion 5 and the slab portion 6 by simply placing the precast concrete bundle member 21 on the upper surface 6a of the slab portion 6. In addition, by simplifying the configuration of the separate rising portion, it is possible to minimize the effort, cost, and construction time required for installing the separate rising portion.

[0067] In contrast, with conventional slab foundations 4, when the concrete was poured, the inner rising portion of the slab foundation 4 was also formed at the same time as the outer perimeter rising portion 5 and the slab portion 6. Therefore, when the slab portion 6 was poured once, it was necessary for workers to enter the inside of the slab foundation 4 before the concrete hardened in order to adjust the position and height of the inner rising portion of the slab foundation 4.

[0068] Therefore, in this embodiment, a precast concrete bundle member 21 is later installed on the upper surface 6a of the completed flat slab portion 6 as another rising portion. This makes it possible to form the slab portion 6 by pouring concrete in a state where all the rising portions on the inside of the mat foundation 4 are removed. Therefore, by eliminating the need to pour the rising portions on the inside, it is not necessary for workers to enter the inside of the mat foundation 4, and it becomes easier to pour the slab portion 6 in one go. In addition, since the precast concrete bundle member 21 is not embedded in the slab portion 6, it is possible to eliminate the need to adjust the position and height of the bundle member 21 when pouring concrete, and since the precast concrete bundle member 21 is not embedded in the slab portion 6, fine adjustments can be made later, improving construction accuracy.

[0069] (Effect 1b) In the foundation structure of the building 1, the precast concrete beam members 21 are used as structural beams (A), and steel beams 31 may be placed on the upper surface 6a of the slab portion 6 as vibration-proof beams (separately from the precast concrete beam members 21). This allows the separate rising portion to be provided with separate functions for the structural beams (A) made of the precast concrete beam members 21 and the vibration-proof beams made of the steel beams 31. By appropriately combining the precast concrete beam members 21 and the steel beams 31, the performance required for the separate rising portion can be easily ensured.

[0070] (Effect 2) In the foundation structure of the building 1, the precast concrete beam member 21 may be disposed in approximately the center 41 of the floor girder 13 of the building 1 without being connected to the building 1. This allows the precast concrete beam member 21 to be specialized for only supporting the structure of the building 1, without providing vibration isolation.

[0071] (Effect 3) In the foundation structure of the building 1, the steel beams 31 are connected to the floor girders 13 of the building 1 with the floor girders 13 sandwiched between them by vibration-proof metal fittings 51, and may also be fastened and fixed to the slab portion 6 by post-installed anchors 52. The vibration-proof metal fittings 51 are connected to the floor girders 13 after the building 1 (building units 7) is installed on the slab foundation 4. In this way, the steel beams 31 receive the lateral tensile load acting on the building 1 via the vibration-proof metal fittings 51, and transmit the load to the slab portion 6 from the fixed portion by the post-installed anchors 52, thereby enabling the vibration prevention of the building 1. EXAMPLES

[0072] <Configuration> The configuration of this embodiment will now be described.

[0073] In addition to the configuration in section (1a) of Example 1, this example has the following configuration: For configurations similar to those described in sections (1b) to (3) of Example 1, the description of Example 1 is taken as the description of this example.

[0074] (4) In this embodiment, as shown in Figs. 8 and 9, the precast concrete beam members 21 are used as structural and vibration-isolating beams (B).

[0075] Here, the structural beams refer to beams for supporting the structure (or vertical load) of the building 1. The vibration isolation beams refer to beams for receiving lateral tensile loads acting on the building 1 and transmitting them to the slab portion 6, thereby providing vibration isolation.

[0076] In this embodiment, the precast concrete beam member 21 functions as both a structural beam and a vibration-isolating beam at the same time. This basically makes the steel beam 31 of the first embodiment unnecessary. However, if necessary, the steel beam 31 may be provided.

[0077] (5) The precast concrete beam member 21 may have an insert member 61 integrally formed on at least one of the top and side surfaces for mounting an anti-vibration metal fitting 51 thereon. The precast concrete beam member 21 is connected to the floor girder 13 of the building 1 by clamping the floor girder 13 with vibration-proof metal fittings 51 attached to the insert member 61, and may also be fastened and fixed to the slab portion 6 by post-installed anchors 52.

[0078] In this embodiment, only one precast concrete beam member 21 is provided at the central portion 41 of the floor girder 13 (in the extension direction 42) on the long side of the building unit 7, so as to support the central portion 41 of each floor girder 13 located inside the slab portion 6 from below.

[0079] Furthermore, the precast concrete beam members 21 simultaneously support the central portions 41 of the adjacent floor girders 13 of the adjacent building units 7 from below.

[0080] In addition, the precast concrete beam member 21 is provided with one or more vibration-isolating metal fittings 51 in the extension direction 42 of the floor girder 13. In this embodiment, the precast concrete beam member 21 is provided with two vibration-isolating metal fittings 51.

[0081] The horizontal dimension 43 of the precast concrete beam member 21 in this embodiment (which in this embodiment refers to the width dimension perpendicular to the extension direction 42 of the floor girder 13) is approximately the same as or slightly wider than the sum of the width 45 of the two lower flange portions 17 of adjacent floor girder 13 and the gap 44 formed between the two lower flange portions 17 of adjacent floor girder 13.

[0082] In addition, the vertical dimension 46 (in this embodiment, the width dimension in the extension direction 42 of the floor girder 13, Figure 9 (a)) of the precast concrete beam member 21 is larger than the above-mentioned horizontal dimension 43 by at least the amount of the vibration-proof metal fittings 51 to be installed, so that one or more vibration-proof metal fittings 51 can be installed.

[0083] Therefore, the cross-sectional shape of the precast concrete beam member 21 is a substantially rectangular shape that is long in the extension direction 42 of the floor girder 13, or a substantially octagonal shape (close to a rectangle) with each corner of the rectangle rounded off. By making it into such a shape, it becomes possible to install one or more vibration-proof metal fittings 51 on the precast concrete beam member 21.

[0084] The height of the precast concrete beam members 21 is approximately the same as the height of the underfloor space 19. However, the precast concrete beam members 21 may be slightly lower than the height of the underfloor space 19 and spacers 47 may be provided to allow height adjustment, as in the first embodiment.

[0085] The insert member 61 is a member for attaching the vibration-isolating metal fittings 51, and is embedded in the precast concrete bundle member 21 during manufacture. A bolt substantially similar to the bolt member 53 in the first embodiment is used for the insert member 61. In this embodiment, the lower end of the insert member 61 is embedded in the upper end surface of the precast concrete bundle member 21, so that the upper end protrudes upward from the upper end surface of the precast concrete bundle member 21.

[0086] The insert members 61 are installed in the same number as the vibration-isolating metal fittings 51 to be installed in the precast concrete beam member 21. The multiple insert members 61 are installed on the upper end surface of the precast concrete beam member 21, etc., along the extension direction 42 of the floor girder 13, with a required interval between them to prevent the multiple vibration-isolating metal fittings 51 from interfering with each other.

[0087] At least one insert member 61 may be embedded so as to protrude upward above the side surface of the precast concrete bundle member 21. In this case, for example, the lower portion of the insert member 61 may be bent at approximately 90 degrees relative to the upper portion and extended laterally, and the laterally extending portion may be embedded in the side surface of the precast concrete bundle member 21.

[0088] The vibration-isolating metal fittings 51 are composed of a push plate 55 and a nut member 56, which are almost the same as those in the first embodiment. In this embodiment, the upper end surface of the precast concrete beam member 21 contacts the lower part of the flange portion 17 on the lower side of the floor girder 13 and performs the same function as the backing plate 54, making it possible to make the backing plate 54 unnecessary. However, depending on the situation, the backing plate 54 may be provided on the upper end surface of the precast concrete beam member 21. This makes it possible to reduce the horizontal dimension 43 of the precast concrete beam member 21. The vibration-isolating metal fittings 51 are attached to each insert member 61 respectively.

[0089] The lower part of the precast concrete bundle member 21 is fixed to the slab portion 6 by post-installed anchors 52 such as bolt screws via an L-shaped metal fixing plate 62 having a vertical surface portion and a horizontal surface portion. At this time, the L-shaped metal fixing plate 62 is installed so that the vertical surface portion contacts the side surface of the lower part of the precast concrete bundle member 21 from the outside and the horizontal surface portion contacts the upper surface 6a of the slab portion 6 from above, and the precast concrete bundle member 21 and the vertical surface portion of the fixing plate 62 are fixed laterally from the outside by the post-installed anchors 52, and the horizontal surface portion of the fixing plate 62 and the slab portion 6 are fixed downward from above by the post-installed anchors 52. As a result, the precast concrete bundle member 21 is fixed to both the slab portion 6 and the floor girder 13.

[0090] Furthermore, a vibration-proof member 63 having a similar structure to the vibration-proof metal fitting 51 may be installed, if necessary, at a position relatively close to the precast concrete bundle member 21 on the side (in the extension direction 42 of the floor girder 13) of the precast concrete bundle member 21 (FIG. 9(b)). This vibration-proof member 63 is obtained by removing the steel bundle body 32 and the lower parts of the steel bundle 31, leaving almost only the vibration-proof metal fitting 51, and by being separated from the slab portion 6, the vibration-proof member 63 is installed on the floor girder 13 in a floating state. That is, the vibration-proof member 63 is composed of the bolt member 53, the receiving plate 54, the pushing plate 55, and the nut member 56, and simultaneously clamps and fixes the adjacent floor girder 13 from above and below. In this embodiment, two vibration-proof members 63 are installed on both sides of the precast concrete bundle member 21. It is preferable that the bolt member 53 is long enough so that it hardly protrudes below the receiving plate 54.

[0091] The installation position of each vibration-isolating member 63 relative to the precast concrete bundle member 21 is preferably within a range of approximately 1 / 2 to 1 / 5 of the distance 59 between the center of the precast concrete bundle member 21 and the outer surface of the outer periphery rising portion 5. In this embodiment, the vibration-isolating members 63 are provided at positions farther away from the precast concrete bundle member 21 than the steel bundles 31 in the first embodiment.

[0092] <Function> The function of this embodiment will now be described.

[0093] A building 1, such as a house, has its lower part supported on the ground 2 by a foundation 3. Concrete is poured into the ground 2 to form a perimeter rising portion 5 that rises along the perimeter of the building 1, and a flat slab portion 6 inside the perimeter rising portion 5, thereby forming a slab foundation 4 on which the building 1 is to be installed. After the slab foundation 4 has been poured, the building 1 is installed on the perimeter rising portion 5.

[0094] When the foundation 3 is a slab foundation 4, the building 1 is supported at a position along the exterior wall by the perimeter rising portion 5. If the slab portion 6 of the slab foundation 4 is one continuous flat surface without any protruding parts or partitions, then a separate rising portion (from the perimeter rising portion 5) is required inside the perimeter rising portion 5 to support the floor girders 13 provided on the inside of the building 1. In the case of a unit building, the separate rising portion is installed at a position where adjacent building units 7 join (where the floor girders 13 are adjacent to each other).

[0095] In this embodiment, at least a precast concrete bundle member 21 is installed on the slab portion 6 as a separate rising portion, instead of the inner rising portion integral with the mat foundation 4. In this case, the separate rising portion consists only of the precast concrete bundle member 21.

[0096] Then, with the precast concrete beam members 21 placed inside the mat foundation 4, the building units 7 that make up the building 1 are placed on top of the mat foundation 4.

[0097] <Effects> According to this embodiment, the following effects can be obtained.

[0098] (Effect 4) In the foundation structure of the building 1 of this embodiment, in addition to (Effect 1a) of the first embodiment, the precast concrete beam members 21 may be used as structural and vibration-proof beams (B). This allows the precast concrete beam members 21 used as another rising part of the slab foundation 4 to be installed together as one structural and vibration-proof beam (B). The precast concrete beam members 21 alone can ensure almost all of the support performance required for the other rising part.

[0099] (Effect 5) In the foundation structure of the building 1, the precast concrete beam member 21 has an insert member 61 integral with it on at least one of the top and side surfaces to which the vibration-proof metal fittings 51 are attached, and the precast concrete beam member 21 may be connected to the floor girder 13 of the building 1 in a state in which the floor girder 13 is sandwiched by the vibration-proof metal fittings 51 attached to the insert member 61 (after the building units 7 constituting the building 1 are installed on the mat foundation 4), and may be fastened and fixed to the slab portion 6 by post-installed anchors 52. In this way, the precast concrete beam member 21 can support the structure of the building 1 by itself, and can absorb the lateral tensile load acting on the building 1 through the vibration-proof metal fittings 51 (provided on the precast concrete beam member 21) and transmit it to the slab portion 6 from the fixed portion by the post-installed anchors 52, thereby preventing vibration.

[0100] In addition, with regard to the same effects as those of the first embodiment, the description of the first embodiment can be taken as the description of this embodiment. [Explanation of symbols]

[0101] 1. Building 3 Basics 5 Periphery riser 6 Slab section 6a Top side 13 Floor beam 21 Precast concrete beams 31 Steel bundle 41 Central part 51 Anti-vibration brackets 52 Post-installed anchors 61 Insert material 62 Fixing plate 63 Anti-vibration material (A) Structural beams (B) Structural and vibration isolation bundles

Claims

1. A foundation structure of a building in which an outer perimeter rising part that rises along the perimeter of the building and a flat slab part provided inside the outer perimeter rising part are poured together, A precast concrete bundle member is placed on the upper surface of the poured slab portion, The precast concrete beam members are used for a structure supporting the vertical load of the building, and as vibration-proof beams that receive lateral tensile loads acting on the building and transmit them to the slab section, thereby isolating the building from vibrations caused by lateral displacements, The precast concrete beam member has an insert member integrally formed on at least one of the top surface and the side surface for attaching a vibration-proof metal fitting, A foundation structure of a building, characterized in that the precast concrete beam member supports the vertical load of the building from below at the center of the floor girder of the building, and is connected to the building by clamping the center of the floor girder with the vibration-proof metal fittings attached to the insert member, and is fastened and fixed to the slab portion by post-installed anchors.

2. The foundation structure of a building according to claim 1, A foundation structure for a building, characterized in that the precast concrete beam member is provided with a plurality of the vibration-proof metal fittings.

3. The foundation structure of the building according to claim 1 or 2, On both sides of the precast concrete beam, vibration isolation members are installed in a suspended state relative to the floor girder of the building, A foundation structure of a building, characterized in that the installation positions of each vibration-isolating member relative to the precast concrete bundle member are within the range of 1 / 2 to 1 / 5 of the distance between the center of the precast concrete bundle member and the outer surface of the outer periphery rising portion.

4. A foundation structure for a building according to any one of claims 1 to 3, A building foundation structure characterized in that the side of the precast concrete beam member at the lower part, which is perpendicular to the extension direction of the floor girder, is fixed to the slab portion by the post-installed anchor via an L-shaped fixing plate.

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