Building foundation structure

Abstract

To provide a foundation structure bearing against lateral force of wind or earthquake and preventing inundation above a floor level of a building during a flood.SOLUTION: A foundation structure of a building 10 comprises: a plurality of bundles 11, 11... extendable upward, erected on a ground surface S and supporting an upper structure 31 of the building by an upper end; a container of a weight 21 grounding on the ground surface directly below the upper structure 31; and coupling means 41 for detachably coupling the upper structure 31 and the container of the weight 21. Even when the ground surface S submerges under water W during a flood, the upper structure 31 floats on the water W.SELECTED DRAWING: Figure 6

Description

[Technical Field]

[0001] The present invention relates to a simple foundation structure for small buildings. [Background technology]

[0002] Known flood-resistant building foundation structures include the technologies described in Japanese Patent Application Laid-Open No. 2015-200080 (Patent Document 1) and Japanese Patent Application Laid-Open No. 2021-127680 (Patent Document 2). According to the technology described in Patent Document 1, a building connected to movable piles inserted into outer shell piles rises due to buoyancy when the water level rises due to a flood. According to the technology described in Patent Document 2, the lower concrete foundation and the upper building body are connected by telescopic columns consisting of inner and outer columns, and the building body rises due to buoyancy when a flood occurs. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2015-200080 [Patent Document 2] Patent Publication No. 2021-127680 Summary of the Invention [Problem to be solved by the invention]

[0004] However, the inventors have discovered that the above-mentioned conventional structures require further improvement. Specifically, because they require embedment in the building foundation, they cannot be easily installed, removed, or relocated from the building foundation. They cannot be installed directly on asphalt-paved surfaces such as parking lots or existing concrete floors, making them unsuitable for relocating or temporary buildings. Furthermore, when building on soil, a ground survey is generally required to prevent the building from sinking, which requires time and effort. Meanwhile, there is a demand for a system that allows small, flood-resistant buildings to be installed as easily as possible on unpaved ground, concrete-paved surfaces, or asphalt-paved surfaces.

[0005] In view of the above-mentioned circumstances, the present invention aims to provide a flood-resistant building foundation structure that does not require embedment and can be installed more easily than conventional structures. [Means for solving the problem]

[0006] For this purpose, the building foundation structure of the present invention comprises a plurality of posts that can extend upward and are erected on the ground surface to support the building's superstructure at their upper ends, a weight container that is placed on the ground surface directly below the superstructure, and a connecting member that detachably connects the superstructure and the weight container.

[0007] According to this invention, a building foundation can be established simply by placing the bundles and weight containers on the ground, making it suitable for relocating or temporary buildings. Furthermore, by filling the weight containers with water, the weights become heavy and protect the building's superstructure from tipping over, ensuring safety against crosswinds and earthquakes. Furthermore, during floods, the weight containers and / or the building's superstructure act as buoyant bodies, keeping the building's superstructure afloat, while the bundles act as lifting guides, extending upward and preventing flooding above the floor of the superstructure.

[0008] The structure of the bundle of the present invention is not particularly limited as long as it is stretchable. In one aspect of the present invention, the bundle has a lower member extending upward from the lower end of the bundle, an upper member extending downward from the upper end of the bundle to engage with the lower member and slide along the lower member, a lower limit stopper provided on one of the lower member and the upper member and abutting against the other to determine the lower limit sliding position of the upper member, and an upper limit stopper provided on one of the lower member and the upper member and abutting against the other to determine the upper limit sliding position of the upper member. According to this aspect, the bundle has a sliding structure and functions as an elevation guide. Furthermore, if the bundle stretches too much, the upper member will not separate from the lower member, and the upper structure will not be swept away.

[0009] The slide structure of the bundle of the present invention is not particularly limited, but in a preferred aspect of the present invention, the lower member includes a lower end member that is provided at the lower end of the bundle and comes into contact with the ground surface, and an axial member that extends upward from the lower end member, the upper member includes a tubular member that extends downward from the upper end of the bundle and has an opening at its lower end, through which the axial member is passed and which accommodates the upper end region of the axial member, and the lower limit stopper is attached to the lower end side of the axial member so that its height position is adjustable and abuts against the lower end of the tubular member, thereby determining the lower slide limit position of the tubular member. and The upper limit stopper is provided at the upper end of the shaft member and engages with the lower end opening of the cylindrical member to determine the upper limit sliding position of the cylindrical member. According to this aspect, the standing length of the stack can be adjusted by adjusting the height position of the lower limit stopper.

[0010] The mechanism for adjusting the height position of the lower limit stopper is not particularly limited. In a further preferred aspect of the present invention, a male thread is formed on the outer peripheral surface of the shaft member, and the lower limit stopper has an internally threaded hole that screws into the male thread of the shaft member. According to this aspect, the erect length of the bundle is adjusted by a screw system. In another aspect, the height position of the lower limit stopper may be adjusted by a hydraulic mechanism.

[0011] In one aspect of the present invention, the cable rack further includes a hole formed on the ground surface to accommodate a part or all of the bundle. According to this aspect, when the building is demolished, the bundle can be accommodated in the hole to complete the cleanup. The part of the bundle may be, for example, a lower member of the bundle or an axial member of the bundle. In another aspect, the hole need not be formed on the ground surface.

[0012] The arrangement of the bundles is not particularly limited, but in one aspect of the present invention, multiple bundles are arranged at intervals in the horizontal direction along the rectangular outline of the superstructure, defining a space below the superstructure, and are arranged at both ends of the short sides of the rectangular outline, defining a single opening between the short sides and the ground. This aspect allows a trailer to be inserted, facilitating the installation and removal of the building. Furthermore, bundles are not arranged along the short sides. [Effects of the Invention]

[0013] Thus, according to the present invention, a building can be easily installed without any rooting work, durability against wind and earthquakes is ensured, and flooding above the floor level is prevented even in the event of a flood. [Brief explanation of the drawings]

[0014] [Figure 1] 1 is a cross-sectional view showing one embodiment of the present invention. [Figure 2] FIG. [Figure 3] FIG. 2 is a vertical cross-sectional view showing the bundle of the embodiment. [Figure 4] FIG. 3 is a cross-sectional view showing a state in which the embodiment is subjected to a lateral force. [Figure 5] FIG. 2 is a cross-sectional view showing the state in which the embodiment is installed on a slope. [Figure 6] FIG. 2 is a cross-sectional view showing the embodiment floating on water. [Figure 7] FIG. 2 is a vertical cross-sectional view showing the bundle of the embodiment. [Figure 8] FIG. 10 is a cross-sectional view showing a modified example of the present invention floating on water. [Figure 9] FIG. 10 is a vertical cross-sectional view showing a bundle according to a modified example of the present invention. [Figure 10] FIG. 10 is a vertical cross-sectional view showing a bundle according to a modified example of the present invention. [Figure 11] FIG. 10 is a side view showing the relocation of the building of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0015] Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. Fig. 1 is a longitudinal cross-sectional view showing a building according to one embodiment of the present invention. Fig. 2 is a plan view showing a building foundation structure according to the same embodiment. Building 10 is a small-scale structure occupying an area of ​​10 to 15 square meters in the plan view of Fig. 2, and includes posts 11, weights 21, a superstructure 31, connecting means 41, and fixing devices 51.

[0016] The superstructure 31 is shown only as an outline in the drawing. The superstructure 31 is one-story and has a floor area of ​​10 to 15 square meters as described above. As shown in the plan view of Figure 2, the outer wall of the superstructure 31 has an outline 32 such as a rectangle. The superstructure 31 and the building 10 may be rectangular, oblong, or may have other shapes not shown. The superstructure 31 is located directly above the weight 21.

[0017] A plurality of beams 11 constitute the foundation structure of the building 10, are arranged along the contour 32 of the outer wall of the superstructure 31, and support the superstructure 31 from below. In this embodiment, beams 11 are arranged at each corner of the rectangular contour of the superstructure 31, and a beam 11 is also arranged at the center of the long side of the rectangular contour of the superstructure 31.

[0018] The weight 21 is placed in the center of the building 10 directly below the superstructure 31 and is surrounded by a plurality of bundles 11. The connecting means 41 connects the weight 21 and the superstructure 31.

[0019] 3 is a vertical cross-sectional view showing bundle 11, with a portion of the bundle 11 shown in cross section to reveal the interior of bundle 11. Bundle 11 has a shape that extends in the vertical direction, and has a lower end member 12, an axial member 13, a tubular member 14, and a tubular support member 15. Lower end member 12 is a plate that comes into contact with ground surface S and supports the lower end of axial member 13.

[0020] The shaft member 13 extends straight in the vertical direction, its lower end is fixed to the lower end member 12, and its upper end region including its upper end is housed in the tubular member 14. The tubular member 14 is a cylindrical body extending downward from the upper end of the bundle 11, and the upper end of the tubular member 14, i.e., the upper end of the bundle 11, is fixed to the bottom surface of the upper structure 31. A lower end opening 14h is formed at the lower end of the tubular member 14. The shaft member 13 passes through the lower end opening 14h. As will be described in more detail below, the tubular member 14 is slidable upward along the shaft member 13. A tube support member 15 is attached to the lower end side of the shaft member 13. The tube support member 15 abuts against the lower end of the tubular member 14 and supports it.

[0021] The height position of the tube support member 15 in the vertical direction can be adjusted along the shaft member 13. In this embodiment, a male thread 13t is formed on the outer periphery of the shaft member 13. The tube support member 15 is ring-shaped and has a female thread on the inner periphery that screws into the male thread 13t. By rotating the tube support member 15, the tube support member 15 moves in the vertical direction over the threads of the male thread 13t. This allows the height position of the tube support member 15 to be adjusted.

[0022] By adjusting the height position of the tube support member 15, the tube member 14 is displaced in the vertical direction. As a result, the height of the upper end of the bundle 11 can be adjusted in the vertical direction. In other words, the erect length of the bundle 11 is adjusted by the tube support member 15. Alternatively, as a modified example not shown, instead of the male screw 13t, the bundle 11 has a hydraulic mechanism driven by hydraulic pressure, and the height position of the tube support member 15 is adjusted by the hydraulic mechanism. As will be described in more detail later, in this embodiment, not only can the erect length of the bundle 11 be adjusted by the tube support member 15, but the tube member 14 can also be extended by moving away from the tube support member 15.

[0023] The beam 11 is erected on the ground surface S. The ground surface S may be soil, an asphalt pavement, or a concrete pavement. The ground including the ground surface S does not require compaction or special ground improvement. In this embodiment, the ground surface S is a paved surface. The lower end member 12 of the beam 11 is fixed to the pavement on the ground surface S with a fixing device 51. The fixing device 51 is, for example, an anchor bolt, a nail, a penetration stake, etc. Preferably, concrete blocks are arranged on the ground surface S, and the fixing device 51 is preferably nailed to the concrete block that will be a component of the ground surface S. The lower end member 12 may be placed on the upper surface of the concrete block.

[0024] Returning to the explanation in Figure 1, the bundle 11 supports the superstructure 31 at its upper end. The superstructure 31 is a box-like structure that can float on water. The weight 21 is composed of a hollow weight container and the contents, such as water, soil, or sand, that are filled into the weight container. Therefore, the weight 21 becomes a lightweight empty container that floats on water by draining the water or soil from the contents. The weight 21 also becomes heavy when filled with water or soil.

[0025] The weight container is a steel or resin tank, preventing leakage of its contents. The weight container is filled with a heavy material, such as water or soil, at the installation site of the building 10, until it reaches a predetermined weight, e.g., a weight heavier than the superstructure. As shown in the plan view of Figure 2, the weight 21 is positioned inside the building's outline 32 and away from the beams 11. The weight 21 is placed flat on the ground surface S and directly supported by the ground. Regarding the flat placement, to increase friction, a non-slip structure such as a protrusion may be provided on the bottom of the weight 21, or a rubber mat may be placed between the weight 21 and the ground surface S. Due to its large weight, the weight 21 will not move due to lateral forces during an earthquake. The weight 21 and lower end member 12 of this embodiment can be placed directly on the ground surface S, such as a parking lot, without any excavation of the ground surface S, and can be easily relocated to another location.

[0026] The height dimension of the weight 21 is smaller than the width and depth dimensions of the weight 21, and is smaller than the height dimension of the bundle 11 as shown in Figure 1a. The weight 21 is placed flat on the ground surface S. Placing the weight 21 flat reduces the surface pressure, making it difficult for the weight 21 to sink from the ground surface S.

[0027] The connecting means 41 is composed of one or more connecting members and connects the weight 21 to a cross member installed on the bottom surface of the superstructure 31. In this embodiment, the connecting means 41 is a combination of rails and runners. It allows relative movement in the vertical direction, but restricts relative movement in the horizontal direction, for example, the direction of the arrangement of a pair of parallel-arranged connecting means, such as the width direction of the weight. The connecting means 41 may also include a fixing device that restricts the relative vertical movement. This fixing device may be, for example, a mechanism that allows relative vertical movement slower than a predetermined speed but prohibits relative vertical movement faster than the predetermined speed, specifically a cam mechanism or damper. Alternatively, the fixing device may be a releasable restraint, such as a combination of a hook and a chain of sufficient length. A chain of sufficient length allows relative vertical movement of the connecting means 41 within the excess chain length but prohibits relative vertical movement beyond the excess chain length. The fixing device can be released by disengaging the hook from the chain.

[0028] The connecting means 41 are arranged in pairs on both sides of the width of the weight 21. One or more pairs of connecting means 41 are provided. Because the connecting means 41 allow relative movement in the vertical direction, even if ground subsidence gradually progresses and the weight 21 sinks, the height position of the superstructure 15 is maintained.

[0029] Figure 4 shows how a horizontal force Hf due to strong winds, earthquakes, etc. acts on the building 10. When the horizontal force Hf acts on the superstructure 31, the weight 21 and the connecting means 41 restrict the horizontal movement of the superstructure 31, preventing the superstructure 31 from moving horizontally. The horizontal force Hf also applies an overturning moment to the superstructure 31, but the weight 21 and the connecting means 41 apply a reaction moment Rv, preventing the superstructure 31 from overturning. As described above, the connecting means includes fixing devices that prohibit relative movement in the vertical direction. The fixing devices prevent the superstructure 31 from suddenly overturning due to strong winds, earthquakes, etc.

[0030] 5 is a vertical cross-sectional view showing the case where the building 10 is installed on a sloping ground SL. By appropriately adjusting the height position of the tubular support members 15 of the beams 11, the upper structure 31 can be maintained horizontal. The weight 21 is placed flat on the sloping ground SL, following the inclination angle of the sloping ground SL.

[0031] 6 and 7 are cross-sectional views showing the state of the building 10 during a flood, with FIG. 6 showing the entire building 10 and FIG. 7 showing the bundle 11 removed. First, when a flood is expected, the contents of the weights 21 are emptied. For example, a pump is used to drain the water from the weight containers, emptying them. The empty weight containers act as buoyancy bodies, providing buoyancy to the superstructure 31.

[0032] When the ground surface S is actually submerged in water W due to a flood, the upper structure 31 and weight container rise together and float above the water surface. The bundle 11 extends upward as a lift guide, guiding the upper structure 31 as it moves up and down in the vertical direction. Referring to FIG. 7, a stopper 16 is fixed to the upper end of the shaft member 13. The stopper 16 is larger than the lower end opening 14h of the tubular member 14 and engages with the lower end of the tubular member 14. In other words, the stopper 16 determines the upper limit of the vertical movement of the tubular member 14. This prevents the tubular member 14 from slipping upward off the shaft member 13. The bundle 11 keeps the upper structure 31 in its original horizontal position while it floats on the water W, preventing it from being swept away by the flood. The tubular support member 15 determines the lower limit of the vertical movement of the tubular member 14.

[0033] Figure 8 is a cross-sectional view of a building 20 according to a modified example of the present invention. In Figure 8, components common to the above-described embodiment are given the same reference numerals and will not be described again; only the differences will be explained here. First, when a flood is predicted, the weight 21 is left containing its contents. The connecting means 41 allows relative movement in the vertical direction, or the connection is released before a flood occurs.

[0034] When the ground surface S is actually submerged in water W due to a flood, the superstructure 31 separates from the weight 21, rises, and floats above the surface of the water W. The bundle 11 also stretches out. In contrast, the weight 21 remains attached to the ground surface S and does not move.

[0035] The superstructure 31 and the weight 21 may be interconnected by a wire (not shown) having a length approximately equal to the maximum extension (FIG. 7) of the bundle 11. This ensures that the superstructure 31 remains in its original horizontal position while floating on the water W and is not swept away by the flood.

[0036] 9 and 10 are longitudinal cross-sectional views of a bundle 11 according to a modified example of the present invention. A hollow pile 17 is buried in the ground surface S. The hollow pile 17 defines a hole 18 for accommodating the shaft member 13. The overall length of the hole 18 is longer than the overall length of the shaft member 13. The inner diameter of the hole 18 is larger than the outer diameter of the shaft member 13. A bottom member 12 is placed on the top end of the hollow pile 17. The bottom member 12 has a female threaded hole in its center that threads with a male thread 13t. As shown in FIG. 9, the shaft member 13 can be advanced downward beyond the bottom member 12 by turning the screw. This allows the standing height of the shaft member 13 from the ground surface S to be adjusted. Furthermore, when the building 10 is demolished, the entire shaft member 13 can be stored in the hole 18.

[0037] FIG. 11 is a side view showing the state when the building 10 is being demolished. When demolishing the building 10, the upright length of the bundles 11 is increased. A space T is defined between the bottom of the superstructure 31 and the ground surface S. As shown in FIG. 2, the superstructure 31 has a rectangular outline. Bundles 11 are placed only on both ends of the short sides of the rectangular outline, but no bundles are placed along the short sides. This short side forms an opening that communicates with the space T. Referring to FIG. 11, the superstructure 31 is higher than the loading platform 102 of the trailer 101. When the loading platform 102 reverses along the ground surface S, as indicated by the arrow, it enters the space T through the opening and is inserted directly below the superstructure 31. Next, the tube support member 15 is rotated to shorten the bundles 11, so that the superstructure 31 is loaded onto the loading platform 102. It goes without saying that the width of the loading platform 102 is narrower than the spacing between the bundles 11, 11 arranged along the short sides of the superstructure 31. It is advisable to keep the bundles 11 short while transporting the building 10. The building 10 can also be placed on the ground by reversing the procedure described above.

[0038] The building foundation structure of this embodiment comprises a plurality of beams 11 that can extend freely upward and are erected on the ground surface S to support the upper structure 31 at their upper ends, a weight 21 that is in contact with the ground surface S directly below the upper structure 31, and a connecting means 41 that connects the upper structure 31 and the weight 21 in a separable manner.

[0039] The bundle 11 has an axial member 13 as a lower member extending upward from the lower end of the bundle 11, an upper tubular member 14 as an upper member extending downward from the upper end of the bundle 11 to engage with the axial member 13 and slide along the axial member 13, a lower limit stopper (tubular support member 15) provided on the axial member 13 as the lower member and abutting against the tubular member 14 as the upper member to determine the lower limit sliding position of the upper member, and an upper limit stopper (stopper 16) provided on one of the lower member and upper member and abutting against the other to determine the upper limit sliding position of the upper member.

[0040] The lower member mentioned above includes a lower end member 12 provided at the lower end of the bundle 11 and in contact with the ground surface S, and an axial member 13 extending upward from the lower end member 12. The upper member mentioned above includes a tubular member 14 extending downward from the upper end of the bundle 11, having a lower end opening 14h through which the axial member 13 is passed and accommodating the upper end region of the axial member 13. A tubular support member 15 serving as a lower limit stopper is attached to the lower end side portion of the axial member 13 so that its height position can be adjusted, and determines the lower limit sliding position of the tubular member 14 by abutting against the lower end of the tubular member 14. and Both support the tubular member 14 from below.

[0041] As shown in FIG. 7, a stopper 16 as an upper limit stopper is provided at the upper end of the shaft member 13, and determines the upper limit sliding position of the cylindrical member 14 by engaging with a lower end opening 14h of the cylindrical member 14.

[0042] As shown in Fig. 9, the shaft member 13 can extend downward beyond the lower end member 12. As shown in Fig. 3, a male thread 13t is formed on the outer peripheral surface of the shaft member 13, and the tube support member 15 serving as a lower limit stopper has a female threaded hole that screws into the male thread 13t. As shown in Fig. 10, a hole 18 is formed in the ground surface S and accommodates part or all of the bundle 11.

[0043] As shown in Figure 2, multiple bundles 11, 11... are arranged at intervals in the horizontal direction along the rectangular outline of the upper structure 31. The bundles 11, 11... define a space T (Figure 11) below the upper structure 31. Two bundles 11, 11 are arranged at each end of the short side of the rectangular outline, defining a space opening between the short side and the ground surface S. Note that no bundles are arranged midway along the short side.

[0044] According to this embodiment, the building 10 can be installed simply by placing it on the ground surface S of a parking lot or the like, making installation simple and eliminating the need for foundation work such as root cutting. Furthermore, according to this embodiment, by adjusting the erection length of the beams 11 using the tubular support members 15, ground subsidence of the superstructure 31 due to aging is eliminated. In other words, there is no need for ground surveys. In other words, even if ground subsidence occurs, the level of the lightweight building 10 can be easily restored using jacking equipment or the like.

[0045] Furthermore, according to this embodiment, the bundle 11, the weight 21, and the superstructure 31 are separate structures, and the weight 21 contains the weight container and contents, so the weight container can be emptied and the building 10 can be easily relocated.

[0046] Furthermore, according to this embodiment, the beams 11 and the weights 21 are separated and the beams 11 do not support the weights 21, which reduces the weight of the beams 11 and the superstructure 31 and prevents the beams 11 and the superstructure 31 from sinking into the ground surface S due to changes over time. However, this does not affect the beams 11 and the superstructure 31 of the structure that are located in a different horizontal position from the weights 21.

[0047] Furthermore, according to this embodiment, as shown in Figures 6 and 8, the superstructure 31 can float on the water W in the event of a flood, preventing damage to the building 10 from flooding above the floor level. In the embodiment shown in Figure 6, the building 10 is maintained in its original horizontal position by the fasteners 51. In the embodiment shown in Figure 8, regardless of whether the fasteners 51 are present or not, the building 10 is maintained in its original horizontal position by connecting the weight 21 and the superstructure 31 with a wire of an appropriate length.

[0048] Furthermore, according to this embodiment, the lower end or the entire shaft member 13 can be housed in a hole 18 provided in the ground surface S, as shown in FIGS.

[0049] In addition, according to this embodiment, the erection length of all bundles 11 can be maximized as needed, and the loading platform 102 of the trailer 101 can be inserted into the short side of the rectangular outline of the superstructure 31 as shown in Figure 11, thereby making it possible to easily set up and remove the building 10.

[0050] Although the embodiments of the present invention have been described above with reference to the drawings, the present invention is not limited to the illustrated embodiments. Various modifications and variations can be made to the illustrated embodiments within the same scope as the present invention or within an equivalent scope. For example, some components can be extracted from the above-described embodiment, and other components can be extracted from the above-described modified example, and these extracted components can be combined.

[0051] In another embodiment (not shown), the connecting means 41 may be a separable connector. The building 10 may also include a sensor (not shown) that detects the occurrence of a flood and outputs a signal to a drive mechanism that discharges the contents from the weight 21 or to a drive mechanism that couples or couples the connecting means 41.

[0052] The weight 21 may be a weight container that is normally empty. When needed, water is poured into the weight container for use. The water in the weight container can be used for daily life purposes.

[0053] The connecting means 41 that connects the upper structure 31 and the weight container to each other may be a chain that hangs down from the upper structure 31 under its own weight alone. This chain has a small amount of excess length and is not normally tensioned, but is tensioned when a horizontal force is applied to prevent the upper structure 31 from tipping over. [Industrial Applicability]

[0054] The present invention is advantageously used in buildings. [Explanation of symbols]

[0055] 10 building, 11 foundation structure, 12 grounding member (lower member), 13 shaft member (lower member), 13t male screw, 14 cylindrical member (upper member), 14h lower end opening, 15 cylinder support member (lower limit stopper), 16 stopper (upper limit stopper), 17 hollow stake, 18 hole, 21 Weight (including weight container), 31 Superstructure, 32 Contour, 41 Connection means, 51 Fixtures, S Ground level, SL Slope.

Claims

1. a plurality of beams that can extend upward and are erected on the ground surface and support the superstructure of the building at their upper ends; a weight container that is placed on the ground surface directly below the superstructure; A building foundation structure comprising a connecting means for detachably connecting the superstructure and the weight container.

2. The bundle is a lower member extending upward from a lower end of the bundle; an upper member extending downward from the upper end of the stack to engage with the lower member and slide along the lower member; a lower limit stopper provided on one of the lower member and the upper member and contacting the other to define a lower limit slide position of the upper member; 2. The building foundation structure according to claim 1, further comprising an upper limit stopper provided on one of the lower member and the upper member and contacting the other to define an upper limit slide position of the upper member.

3. the lower member includes a lower end member provided at the lower end of the bundle and in contact with the ground surface, and a shaft member extending upward from the lower end member, the upper member includes a tubular member extending downward from the upper end of the bundle, having an opening at a lower end, through which the shaft member is passed, and accommodating an upper end region of the shaft member; the lower limit stopper is attached to a lower end portion of the shaft member so as to be adjustable in height position, and abuts against the lower end of the cylindrical member to define the slide lower limit position of the cylindrical member and support the cylindrical member from below; 3. The building foundation structure according to claim 2, wherein the upper limit stopper is provided at the upper end of the shaft member and engages with the lower end opening of the tubular member to define an upper limit sliding position of the tubular member.

4. A male thread is formed on the outer circumferential surface of the shaft member, The building foundation structure according to claim 3 , wherein the lower limit stopper has an internally threaded hole that is threadably engaged with the external thread.

5. The building foundation structure according to any one of claims 1 to 4, further comprising holes formed on the ground surface to accommodate some or all of the bundles.

6. The plurality of bundles are horizontally spaced apart along a rectangular contour of the superstructure to define a space below the superstructure; The building foundation structure according to any one of claims 1 to 5, wherein the base members are arranged at both ends of the short sides of the rectangular outline, and define an opening of the space between the short sides and the ground surface.

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