Building foundation and method for installing the same

Abstract

To provide a building foundation capable of improving energy-saving performance of a building.SOLUTION: A building foundation comprises a floor slab and at least one columnar member. The columnar member is embedded within the floor slab and extends in the thickness direction of the floor slab. The at least one columnar member has a higher thermal conductivity than the floor slab.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to building foundations and methods for installing same. [Background technology]

[0002] Patent Document 1 discloses a technique for inspecting whether the position of a formwork is misaligned with the design drawings when constructing the foundation of a building, using a formwork corner inspection jig and a formwork straight section inspection jig. This technique can prevent the formwork position from misaligning with the design drawings, enabling the foundation of a building to be constructed with high precision. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 6906746 Summary of the Invention [Problem to be solved by the invention]

[0004] In recent years, there has been a demand for buildings with high energy-saving performance. For example, technologies that utilize renewable energy sources such as solar and wind power to adjust the temperature inside a building have been promoted. These technologies include, for example, zero-energy technologies that achieve a zero-energy balance of electricity usage. However, solar energy is difficult to obtain at night or in bad weather, and wind power is also easily affected by weather. After extensive research, the inventors focused on utilizing geothermal energy, a type of renewable energy. Geothermal energy maintains a nearly uniform temperature throughout the year and is warmer in winter and cooler in summer than the outside air. Furthermore, the crushed stone layer directly below a concrete foundation covered with insulation that blocks outside air can achieve a stable temperature due to the influence of geothermal heat compared to the outside air.

[0005] One aspect of the present disclosure is to provide a higher quality building foundation that can improve the energy saving performance of the building. [Means for solving the problem]

[0006] One aspect of the present disclosure is a foundation for a building, the foundation for the building comprising a floor slab and at least one columnar member. The columnar member is embedded inside the floor slab and extends in a thickness direction of the floor slab. The at least one columnar member has a higher thermal conductivity than the floor slab.

[0007] This configuration improves the efficiency of heat transfer between the upper and lower parts of the floor slab compared to a configuration in which at least one columnar member is not embedded in the floor slab. Therefore, the air above the floor slab can be heated or cooled using geothermal heat so that the temperature of the air above the floor slab approaches the ground temperature, and this air can be used to improve the energy-saving performance of the building.

[0008] One aspect of the present disclosure may further include a fixing portion that guides the at least one columnar member to be placed at a predetermined position, and fixes the at least one columnar member at the predetermined position.

[0009] This configuration makes it easier to determine the position where the at least one columnar member is to be placed, and also makes it possible to prevent the at least one columnar member from falling over. In one aspect of the present disclosure, reinforcing bars may be embedded in a grid pattern in the floor slab. The fixing portion may be attached to the reinforcing bars. The fixing portion may include a frame body, a hook, and a plurality of support portions. , may be provided. The hook is connected to the frame body. The hook may also be hooked onto a reinforcing bar. When a position approximately in the center of the space surrounded by the frame body is defined as a specified position, the multiple support parts may be members extending from the frame body toward the specified position. At least one columnar member may be supported at the specified position by the multiple support parts.

[0010] With this configuration, the fixing portion can be easily attached to the reinforcing bar, and since the columnar member is surrounded by the multiple support portions, the columnar member can be firmly fixed. One aspect of the present disclosure may further include a riser, insulation, a fastening member, and a screw hole. The riser is a wall extending upward from the floor slab. The insulation is disposed on the outside of the riser and the floor slab. The fastening member fastens the riser or the floor slab to the insulation. The screw hole is formed in the riser or the floor slab, and the fastening member is inserted into the screw hole.

[0011] With this configuration, the heat insulating material envelops the building, improving its airtightness. In one aspect of the present disclosure, the screw holes may be formed below ground level.

[0012] With this configuration, the screw holes and fastening members are less likely to come into contact with air than in a configuration in which the screw holes are installed above ground level, which makes it possible to prevent the screw holes and fastening members from rusting or otherwise deteriorating.

[0013] In one aspect of the present disclosure, a floor slab may be formed based on the height of at least one columnar member. This configuration makes it easier to create a floor slab with a uniform thickness.

[0014] In one aspect of the present disclosure, at least one columnar member may be concrete formulated with alumina cement. According to this configuration, the thermal conductivity of the at least one columnar member can be further improved compared to concrete that does not contain alumina cement.

[0015] One aspect of the present disclosure may be a method for installing a foundation for a building. This installation method includes marking out the foundation using a marking plate and erecting multiple foundation outer frames along the lines drawn by the marking. The installation method also includes placing an inspection plate at a corner of the foundation so that multiple joint surfaces are joined to each of the outer frames, measuring positions of intersections of the foundation outer frames using an inspection tool, and placing at least one columnar member at a position where a floor slab will be formed. After measuring the positions of the intersections, the method also includes pouring concrete at a position including the columnar member to form a floor slab and risers that will form the foundation of the building.

[0016] According to this method, the foundation of a building can be installed with high positioning accuracy in order to improve the energy saving performance of the building. [Brief explanation of the drawings]

[0017] [Figure 1] FIG. 1 is a schematic perspective view showing an outline of a foundation of a building. [Figure 2] FIG. 2A is a vertical cross-sectional view showing a state in which an outer formwork has been set up and concrete has been poured, and FIG. 2B is a vertical cross-sectional view showing a state in which an inner formwork has been set up and concrete has been poured. [Figure 3] FIG. 10 is a vertical cross-sectional view showing the state in which the heat insulating material is provided. [Figure 4] FIG. 10 is a side view showing the state in which the heat insulating material is provided. [Figure 5] 5A and 5B are diagrams showing a state in which a fixing portion is attached to a reinforcing bar, with FIG. 5A being a plan view and FIG. 5B being a perspective view. [Figure 6] FIG. 6A is a plan view of a fixing portion of a modified example, and FIG. 6B is a plan view of a fixing portion of another modified example. [Figure 7] FIG. [Figure 8] 8A is a plan view of the test plate, FIG. 8B is a front view of the test plate, FIG. 8C is a right side view of the test plate, and FIG. 8D is a rear view of the test plate. [Figure 9] FIG. 10 is a plan view showing an example of use of the inspection plate. [Figure 10] FIG. 10 is a vertical cross-sectional view showing a modified example of a columnar member. DETAILED DESCRIPTION OF THE INVENTION

[0018] Hereinafter, exemplary embodiments of the present disclosure will be described with reference to the drawings. [1. Embodiment] [1-1. Overall structure] The foundation 1 of the building shown in FIG. 1 comprises a floor slab 2, a riser 3, and a plurality of columnar members 4.

[0019] The floor slab 2 is a plate material that constitutes the underfloor of a building and supports loads perpendicular to its surface. The floor slab 2 is, for example, a concrete plate material. Reinforcement bars 21 are embedded in the floor slab 2 in a lattice pattern. A target section, which is one section of the lattice formed by the reinforcing bars 21, is formed into a rectangle of approximately 200 mm x 200 mm.

[0020] 2A and 2B, the floor slab 2 has an outer periphery 22 that forms the outer periphery of the foundation 1 of the building, and an inner periphery 23 that is surrounded by the outer periphery 22 and forms the portion inside the outer periphery 22. The outer periphery 22 includes a portion that is formed below the ground surface 10. The inner periphery 23 is formed above the ground surface 10. Here, the ground surface 10 is what is known as ground level (GL), and refers to a position at approximately the same height as the height of the ground that will be visible after the building is constructed.

[0021] Returning to FIG. 1, riser 3 is a wall extending upward from floor slab 2. The plurality of columnar members 4 are embedded inside the floor slab 2. The plurality of columnar members 4 are columnar members extending in the thickness direction of the floor slab 2. The plurality of columnar members 4 are members with a higher thermal conductivity than the floor slab 2. In this embodiment, the plurality of columnar members 4 are configured in a cylindrical shape with a diameter of approximately 100 mm and a height of approximately 155 mm. A mark 41 is attached to the plurality of columnar members 4 at a height of approximately 150 mm. The plurality of columnar members 4 are made of concrete mixed with alumina cement. One of the plurality of columnar members 4 is arranged for each target section.

[0022] The building foundation 1 may include a thermal insulation material 8 as shown in Figures 2A, 2B, 3, and 4. The building foundation 1 may also include a decorative panel 9 as shown in Figures 2A, 2B, and 3. The thermal insulation material 8 is disposed on the outer surface of the rising portion 3 and the outer periphery 22, and the decorative panel 9 is disposed on the outer surface of the thermal insulation material 8. For example, the thermal insulation material 8 may be a foam plastic insulating material such as polystyrene foam, rigid urethane foam, or phenolic foam. Alternatively, the thermal insulation material 8 may be an inorganic fiber insulating material such as glass wool, a wood fiber insulating material such as cellulose fiber, or a natural material insulating material such as carbonized cork. The decorative panel 9 may be made of any material. The decorative panel 9 may be disposed after the rising portion 3 and the outer periphery 22 are completed.

[0023] [1-2. Fixed part] The foundation 1 of the building is equipped with a fixing part 5 shown in Figures 5A and 5B. The fixing part 5 is a part that guides the columnar member 4 to be placed at a specified position, and fixes the columnar member 4 at the specified position. One fixing part 5 is attached to each target section, and one columnar member 4 is fixed to one fixing part 5. In this embodiment, approximately the center of the target section is set to the specified position. The fixing part 5 is attached to all of the target sections that are located on the inner circumference 23 among the target sections. Below, a scene in which one fixing part 5 guides and fixes one columnar member 4 will be described.

[0024] The fixing part 5 includes a frame body 51, four hooks 52, and four support parts 53. The fixing part 5 is formed, for example, from a steel wire having a thickness of about 3 to 6 mm. The frame 51 is an octagonal frame that is slightly smaller than the target section. The frame 51 may have a shape other than an octagon, such as a square.

[0025] The four hooks 52 are connected to the frame body 51. In this embodiment, one hook 52 is connected to one side of the frame body 51. The four hooks 52 are hooked onto the reinforcing bars 21.

[0026] The four support portions 53 are rod-shaped members extending from the frame body 51 toward approximately the center of the space surrounded by the frame body 51. In this embodiment, the fixing portion 5 is positioned so that approximately the center of the space surrounded by the frame body 51 coincides with approximately the center of the target compartment, and therefore the four support portions 53 extend toward the specified position. Each of the four support portions 53 extends from a corner of the frame body 51 toward the specified position. Four tip portions 531, which are the ends of the four support portions 53 opposite the corner portions of the frame body 51, are arranged at intervals near the specified position. One columnar member 4 is arranged at a position surrounded by the four tip portions 531 and is supported at the specified position by the four support portions 53.

[0027] [1-3. An example of the steps to build a building foundation] As shown in FIG. 1, workers perform excavation work to dig up the ground, ground work to lay crushed stone 25 to solidify the ground, and work to pour so-called basal concrete (hereinafter referred to as basal concrete).

[0028] Next, the worker performs a task called marking, in which he draws a line on the base concrete to indicate the periphery of the foundation, in this case the position of the riser 3. At this time, a marking plate 30 shown in FIG. 7 is used. The marking plate 30 is a generally L-shaped plate-like member having a plurality of holes 31a, 31b, and 31c formed therein for marking corners of the foundation. Any plate-like material can be used for the marking plate 30, such as a cardboard plate, a metal plate, or a plastic plate. Of the plurality of holes 31a to 31c, the outer hole 31a indicates the position of the intersection of the confirmation line 32a. Of the plurality of holes 31a to 31c, the middle hole 31b indicates the position of the intersection of the formwork outer edge line 32b. Of the plurality of holes 31a to 31c, the inner hole 31c indicates the position of the intersection of the center line 32c. The marking plate 30 has cutouts (indicated by dashed lines) formed for each of the plurality of holes 31a to 31c, the width of which narrows with increasing distance from the holes 31a to 31c. The thread of the waterline (for marking) is hooked onto these notches, and the notches hold the waterline so that it does not come off.

[0029] Note that a confirmation line 32a, a formwork outer edge line 32b, and a center line 32c (hereinafter referred to as lines 32a to 32c) are drawn on the marking plate 30. The confirmation line 32a is a line used to visually confirm the position of the foundation, the formwork outer edge line 32b is a line that indicates the position inside the outer formwork 6a, and the center line 32c is a line that indicates the center of the foundation in the width direction.

[0030] The marking plate 30 is configured to be separable into a first plate 30a and a second plate 30b by a dividing portion 33a including the positions of the multiple holes 31a to 31c. Two recesses are formed on one end surface of the first plate 30a. Two protrusions that can engage with the recesses of the first plate 30a are formed on one end surface of the second plate 30b. The marking plate 30 is configured with engagement portions 33b and 33c by engaging these recesses and protrusions. The engagement portions 33b and 33c prevent the first plate 30a and the second plate 30b from shifting along the dividing portion 33a. In addition to the multiple holes 31a to 31c, the marking plate 30 may also have screw holes 34a to 34f formed therein.

[0031] In the marking work, as a preparation, the worker first determines the position of the intersection of the formwork outer edge line 32b for a corner of a foundation on the basin concrete, and then places the first plate 30a or the second plate 30b so that this position coincides with the center hole 31b. At this time, the marking plate 30 is in a divided state, and only one of the first plate 30a and the second plate 30b is used.

[0032] Then, using a laser measuring device or the like, the first plate 30a or the second plate 30b is rotated as appropriate so that the formwork outer edge line 32b on the marking plate 30 faces the position of the adjacent corner, and the plate 30a or 30b is fixed to the basin concrete. Any fixing method can be used in this case, but for example, a method of driving screws, pins, etc. into the screw holes 34a to 34f can be used.

[0033] Next, the positions of the intersections of the confirmation lines 32a and the center lines 32c are determined using the inner holes 31a and the outer holes 31c. In this state, the other of the first plate 30a and the second plate 30b is combined with the already fixed first plate 30a and the second plate 30b, and similarly fixed to the waste conduit.

[0034] The same process is carried out for the corners of the adjacent foundations. Then, the lines 32a to 32c connecting these two corners are transferred. In this process, the holes 31a to 31c at the adjacent corners are connected with a waterline, and ink is applied to this waterline, which is then transferred to the temporary concrete base, thereby drawing the lines 32a to 32c on the temporary concrete base.

[0035] In this case, once the worker determines the intersection points of the formwork outer edge line 32b, he or she can easily draw the lines 32a to 32c using the marking plate 30, which improves work efficiency and improves drawing accuracy of the lines 32a to 32c.

[0036] Then, as shown in FIG. 1, the reinforcing bars 21 are arranged in a lattice pattern. Next, as shown in FIGS. 5A and 5B, the worker attaches one fixing part 5 to each target section.

[0037] Next, the worker places one columnar member 4 on each fixing portion 5. Next, as shown in FIGS. 2A and 2B, the worker installs the formwork. More specifically, the worker first installs multiple outer formworks 6a along the marked lines 32a-32c. At this time, the worker places the insert nuts 7 below the ground surface 10. Specifically, the worker places the insulating material 8 on the inner surface of the outer formwork 6a, passes the bolts 62 through the through holes 61 formed in the outer formwork 6a, and inserts the tips of the bolts 62 into the insert nuts 7 on the inner surface of the outer formwork 6a. The insert nuts 7 penetrate the insulating material 8 and are held on the inner surface of the outer formwork 6a at the height of the through holes 61. Note that, to prevent the outer formwork 6a from shifting position, it is preferable to secure the outer formwork 6a using braces 63 and stoppers 64.

[0038] Next, the worker uses the inspection plate 45 and an inspection tool to check whether the outer form 6a is positioned correctly. As shown in FIGS. 8A, 8B, 8C, 8D, and 9, the inspection plate 45 includes a plate-shaped main body 46 and two accessory plates 47. The inspection plate 45 may also include a handle 49 that can be gripped by a user when carrying the inspection plate 45. The two accessory plates 47 have mating surfaces 47a and are fixed to the underside of the main body 46 so that the mating surfaces 47a form a 90-degree angle with each other. The main body 46 and the two accessory plates 47 are fastened together by fastening members B, such as bolts and nuts. These may also be fastened together using adhesive or the like. The fastening members B are shown only in FIG. 8B and are omitted in the other figures.

[0039] The main body 46 is configured as a roughly square metal plate, and an inspection hole 46h is formed at the intersection of the extensions of the two joining surfaces 47a. 9, with the two joining surfaces 47a of the inspection plate 45 joined to the outer formwork 6a, an inspection tool (for example, a part of the reflecting portion that reflects laser light irradiated by a laser measuring device) is inserted into the inspection hole 46h to inspect the position of the inspection hole 46h. Theoretically, the position of the inspection hole 46h is the position of the outer hole 31a, which coincides with the position of the intersection of the outer formwork 6a at the corner of the foundation.

[0040] Here, the joining surface 47a is configured to include a magnetic plate. If the outer formwork 6a is made of iron, the joining surface 47a is prevented from separating from the outer formwork 6a. Next, workers pour concrete to form the floor slab 2. During this process, the workers proceed with the work while visually checking the marks 41 on the columnar members 4, and the concrete is poured up to the position of the marks 41. Once the concrete has been poured, the reinforcing bars 21, fixing parts 5, and insert nuts 7 are embedded in the floor slab 2. The columnar members 4 are embedded with about the top 5 mm exposed from the floor slab 2.

[0041] Next, the worker sets up the inner formwork 6b. Next, the worker pours concrete between the outer formwork 6a and the inner formwork 6b to form the riser 3.

[0042] In this manner, the insulating material 8 is disposed on the outer surface of the rising portion 3. The insulating material 8 is fixed using a plate 81. An insert nut 7 is inserted into the insulating material 8. As shown in FIGS. 3 and 4, an insert sleeve 71 may be inserted instead of the insert nut 7. The insert sleeve 71 is connected to the insert nut 7. The length of the insert sleeve 71 is designed to be slightly shorter than the thickness of the insulating material 8. The insulating material of a building can be placed directly above the foundation insulating material 8. A bolt 83 is inserted into the insert sleeve 71 and the insert nut 7 through a through hole 82 formed in the plate 81 to secure the plate 81. At this time, because the length of the insert sleeve 71 is designed to be shorter than the thickness of the insulating material 8, the bolt 83 can be firmly fixed by biting into the insulating material 8. With this structure, the insulating material 8 is fixed by the bolt 83, making it easy to replace the external insulating material 8.

[0043] As shown in FIG. 1, support legs 26 and beams 27 are installed on the upper surface of the floor slab 2, and a floor structure (not shown) that constitutes the floor of the building is placed thereon.

[0044] [1-4. Effect] A space 100 is formed under the floor, surrounded by the floor slab 2, the rising 3, and the floor structure. A duct (not shown) is also provided under the floor, connecting the space under the floor with the inside of the building. As an example, the duct is provided on the side closer to the floor structure than the floor slab 2, floating above the floor slab 2. The air in the space 100 and the air inside the building circulate through the duct. Note that some of the air may circulate between the space 100 and the inside of the building, and some may be replaced with outside air.

[0045] In winter, the temperature of the geothermal heat is higher than the air temperature, i.e., the temperature of the air in the space 100, so the geothermal heat is transferred to the space 100 through the floor slab 2. The multiple columnar members 4 have a higher thermal conductivity than the floor slab 2, so the geothermal heat is transferred to the space 100 through the multiple columnar members 4. The transferred geothermal heat heats the air in the space 100. The heated air in the space 100 flows into the building through the duct. The air that flows into the building raises the temperature inside the building. Therefore, the geothermal heat can be used to heat the inside of the building.

[0046] In the summer, the temperature of the underground heat is lower than the air temperature, so the heat of the air in the space 100 is transferred into the ground through the floor slab 2. The multiple columnar members 4 have a higher thermal conductivity than the floor slab 2, so the heat of the air in the space 100 is transferred into the ground through the multiple columnar members 4. This allows the air in the space 100 to be cooled. The cooled air flows into the building through the duct. The air that flows into the building can lower the temperature inside the building.

[0047] [1-5.Effects] According to the embodiment described above in detail, the following effects can be obtained. (1a) The multiple columnar members 4 are members with a higher thermal conductivity than the floor slab 2. With this configuration, the efficiency of heat transfer between the upper and lower parts of the floor slab 2 can be improved compared to a configuration in which the multiple columnar members 4 are not embedded in the floor slab 2. Therefore, by utilizing geothermal heat, it is possible to heat or cool the air above the floor slab 2 so that the temperature of the air above the floor slab 2 approaches the ground temperature, and this air can be used to improve the energy-saving performance of the building.

[0048] Furthermore, the plurality of pillars 4 are made of concrete containing alumina cement. With this configuration, the thermal conductivity can be further improved compared to concrete that does not contain alumina cement.

[0049] (1b) The fixing portion 5 is a member for guiding the columnar member 4 to a specified position and fixing the columnar member 4 at the specified position. This configuration can prevent the position of the columnar member 4 from varying from one target section to another. It can also prevent the columnar member 4 from falling over when pouring concrete.

[0050] (1c) One columnar member 4 is disposed at a position surrounded by four tip portions 531, and is supported at a specified position by four support portions 53. With this configuration, the columnar member 4 can be firmly fixed from all four sides.

[0051] (1d) The heat insulating material 8 is placed on the outer surface of the rising portion 3, and the heat insulating material 8 is fixed with the bolt 83, the insert sleeve 71, and the insert nut 7. With this configuration, the heat insulating material 8 envelops the building, thereby improving airtightness.

[0052] (1e) The insert nut 7 is embedded below the ground surface 10. With this configuration, the insert nut 7 and the bolt 83 are less likely to come into contact with air compared to a configuration in which the insert nut 7 is attached above the ground surface 10. This makes it possible to prevent the insert nut 7 and the bolt 83 from deteriorating due to rust or the like.

[0053] (1f) The columnar members 4 are marked with marks 41, and when forming the floor slab 2, concrete is poured up to the position of the marks 41 on the columnar members 4. In other words, the floor slab 2 is formed based on the height of the columnar members 4. This configuration makes it easier to create a uniform thickness for the floor slab 2. In addition, there is no need to use separate members such as spacers to measure the thickness of the floor slab 2.

[0054] (1g) The above-described method for installing a foundation for a building includes marking out using a marking plate 30 and erecting multiple outer formworks 6a of the foundation along the lines drawn by the marking. It also includes arranging an inspection plate 45 at the corners of the foundation so that multiple joint surfaces 47a are joined to each of the outer formworks 6a, and measuring the positions of the intersections of the outer formworks 6a using an inspection tool. It also includes arranging at least one columnar member 4 at a position where a floor slab 2 will be formed, and after measuring the positions of the intersections, pouring concrete into the position including the columnar member to form the floor slab 2 and risers 3 that will form the foundation of the building. include.

[0055] According to this method, the foundation of a building can be installed with high positioning accuracy, which can improve the energy-saving performance of the building. [1-6. Correspondence] The bolt 83 corresponds to the fastening member, and the insert nut 7 corresponds to the screw hole.

[0056] 2. Other Embodiments Although the embodiments of the present disclosure have been described above, it goes without saying that the present disclosure is not limited to the above-described embodiments and can take on various forms.

[0057] (2a) In the above embodiment, the columnar member 4 has a cylindrical shape. However, the shape of the columnar member 4 is not limited to this. For example, the columnar member 4 may be a polygonal column, or may have a shape whose horizontal cross-sectional area varies depending on the height. Furthermore, the columnar member 4 may be 155 mm or more. The height of the columnar member 4 may be determined appropriately depending on the thickness of the floor slab 2 to be constructed.

[0058] (2b) In the above embodiment, the heat insulating material 8 is disposed on the outer surface of the rising portion 3. However, the heat insulating material 8 may be disposed on the inner surface of the rising portion 3.

[0059] (2c) In the above embodiment, the frame body 51 is exemplified as a rectangular frame. However, the shape of the frame body 51 is not limited to this. For example, the frame body 51 may be a circular frame or a triangular frame. Furthermore, the frame body 51 does not need to be a continuous ring, as long as it is configured in a ring shape as a whole.

[0060] (2d) In the above embodiment, a configuration in which one hook 52 is connected to one side of the frame body 51 has been exemplified. However, the number of hooks 52 connected to one side of the frame body 51 is not limited to this. For example, as shown in FIG. 6A , multiple hooks 52 may be connected to one side of the frame body 51. Furthermore, the positions at which the hooks 52 connect to the frame body 51 of adjacent fixing portions 5 may be shifted. With this configuration, adjacent fixing portions 5 can be attached to the reinforcing bar 21 without the hooks 52 interfering with each other. 6B, the columnar member 4 may be positioned using an attachment 90 instead of the fixing portion 5. The attachment 90 comprises a main body 91 attached to the reinforcing bar 21 and a support portion 92 extending from the main body 91 toward the columnar member 4. The main body 91 is made of resin such as plastic. The support portion 92 is a rod-shaped member made of metal. The attachments 90 are arranged at multiple locations (for example, four locations) around the columnar member 4.

[0061] (2e) In the above embodiment, a configuration in which four support portions 53 are provided is exemplified. However, the number of support portions 53 is not limited to this. The number of support portions 53 may be two or three. Furthermore, the number of support portions 53 may be five or more.

[0062] (2f) In the above embodiment, the support portion 53 is a rod-shaped member. However, the shape of the support portion 53 is not limited to this. For example, the support portion 53 may be plate-shaped, or the tip portion 531 may be curved in a direction intersecting the rod-shaped portion of the support portion 53, or may be V-shaped.

[0063] (2g) In the above embodiment, the heat insulating material 8 and the outer peripheral portion 22 are fixed to each other. However, the position where the heat insulating material 8 is fixed is not limited to this. For example, the heat insulating material 8 may be fixed to the rising portion 3. In this case, the insert nut 7 may be embedded in the rising portion 3.

[0064] (2h) In the above embodiment, the columnar members 4 are marked with marks 41, and when forming the floor slab 2, concrete is poured up to the position of the marks 41 on the columnar members 4. However, when forming the floor slab 2, concrete may be poured up to the top end of the columnar members 4.

[0065] (2i) In the above embodiment, a configuration has been exemplified in which the fixing portion 5 is attached to all of the target compartments arranged in the inner peripheral portion 23 among the target compartments. However, the arrangement of the fixing portion 5 is not limited to this. For example, the fixing portion 5 may be arranged in only a portion of the inner peripheral portion 23. Furthermore, the fixing portion 5 may be arranged in the outer peripheral portion 22.

[0066] (2j) In the above embodiment, the columnar member 4 is exemplified as a cylindrical member having the same diameter at the upper and lower ends. However, as shown in FIG. 10, for example, a columnar member 4A may be employed in which the lower diameter D2 is set larger than the upper diameter D1. In other words, the columnar member 4A may have a tapered shape configured so that the cross-sectional area decreases from the lower end side to the upper end side. The upper diameter D1 and the lower diameter D2 indicate the diameters at the upper and lower ends of the columnar member 4A. The ratio of the upper diameter D1 to the lower diameter D2 is arbitrary, but for example, a configuration in which D2 is approximately 1.1 to 1.3 times D1 may be employed.

[0067] With this configuration, the columnar members 4A can be stably arranged. (2k) The function of one component in the above embodiments may be distributed among multiple components, or the functions of multiple components may be integrated into one component. Also, part of the configuration of the above embodiments may be omitted. Furthermore, at least part of the configuration of the above embodiments may be added to or substituted for the configuration of another of the above embodiments. [Explanation of symbols]

[0068] 1...building foundation, 2...floor slab, 3...rise, 4,4A...columnar member, 5...fixing part, 6a...outer formwork, 6b...inner formwork, 7...insert nut, 8...insulating material, 21...reinforcing bar, 22...outer periphery, 23...inner periphery, 25...crushed stone, 26...support leg, 27...beam, 30...marking plate, 41...mark, 45...inspection plate, 51...frame body, 52...hook, 53...support part, 61,82...through hole, 62,83...bolt, 63...retainer, 64...stopper, 71...insert sleeve, 81...plate, 100...space, 531...tip part.

Claims

1. A foundation for a building, Floor slab and At least one columnar member embedded in the floor slab and extending in the thickness direction of the floor slab; Equipped with A building foundation, wherein the at least one columnar member has a higher thermal conductivity than the floor slab.

2. 2. The building foundation of claim 1, A foundation for a building, further comprising a fixing portion that guides the at least one columnar member to be placed at a predetermined position and fixes the at least one columnar member at the predetermined position.

3. 3. The building foundation according to claim 2, The floor slab has reinforcing bars embedded in a grid pattern, The fixing portion is attached to the reinforcing bar, the fixing portion includes a frame body, a hook connected to the frame body, and a plurality of support portions; The hook is hooked onto the reinforcing bar, When the position of the approximate center of the space surrounded by the frame body is defined as the specified position, the plurality of support portions are members extending from the frame body toward the specified position, A foundation for a building, wherein the at least one columnar member is supported at the specified position by the plurality of support portions.

4. The foundation of the building according to claim 1 or 2, a riser, which is a wall extending upward from the floor slab; a thermal insulation material disposed on the outside of the riser and the floor slab; A fastening member that fastens the rising or the floor slab to the thermal insulation material; A screw hole formed in the riser or the floor slab, into which the fastening member is inserted; A foundation for a building, further comprising:

5. 5. The building foundation according to claim 4, The screw holes are formed below ground level in the foundation of a building.

6. The foundation of the building according to claim 1 or 2, A building foundation, wherein the floor slab is formed based on the height of the at least one columnar member.

7. The foundation of the building according to claim 1 or 2, A building foundation, wherein the at least one columnar member is made of concrete containing alumina cement.

8. A method of installing a foundation for a building, comprising: Marking is performed by drawing lines indicating the position of the outer periphery of the foundation using a marking plate having a plurality of holes formed therein as markers for the corners of the foundation; erecting a plurality of foundation outer frames along the lines drawn by the marking; An inspection plate having a plurality of joint surfaces configured to be connectable to the outer frames of the plurality of foundations arranged so as to intersect with each other at the corners of the foundation, and configured so that inspection tools for position measurement can be installed, is arranged so that the plurality of joint surfaces are connected to each of the outer frames, and the positions of the intersections of the outer frames of the foundation are measured using the inspection tools. To do, A columnar member formed in a columnar shape extending in the thickness direction of the floor slab, and at least one columnar member is arranged at a position where the floor slab is to be formed; After measuring the position of the intersection, pouring concrete into the position including the columnar member to form a floor slab and riser that will become the foundation of the building; How to install the foundation, including:

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