Foundation structure and method of construction thereof

Abstract

The challenge is to ensure that the sleeve pipes do not adversely affect the strength and reinforcement of the underground beams of the foundation structure. [Solution] The foundation structure 1 comprises an underground beam 20, a rising section 30, and a sleeve pipe 50. The underground beam 20 is embedded in the ground 9. The rising section 30 rises from the upper end of the underground beam 20. The rising section 30 is formed integrally with the underground beam 20. The rising section 30 has a lower part that is embedded in the ground 9. The rising section 30 has an upper part that protrudes upward from the ground. The slab 40 extends horizontally from the rising section 30 at a position below the upper end of the rising section 30. The sleeve pipe 50 is embedded in the slab 40 and the rising section 30 from the upper surface of the slab 40 to the outer circumferential surface 31 of the rising section 30. The first end 52 of the sleeve pipe 50 opens on the upper surface of the slab 40. The second end 54 of the sleeve pipe 50 opens on the outer circumferential surface 31 of the rising section 30 and is embedded in the ground 9.

Description

Technical Field

[0001] The technology disclosed in this specification relates to a foundation structure and a construction method thereof.

Background Art

[0002] Patent Document 1 discloses a foundation. The concrete slab of the foundation is placed underground, the rising part of the foundation is formed above the ground on the outer periphery of the concrete slab, and openings such as a manhole are formed in the rising part.

[0003] Patent Documents 2 and 3 disclose drain pipes. The drain pipe penetrates from the inner periphery to the outer periphery of the rising part of the foundation. One end of the drain pipe opens at the inner periphery of the rising part, and the other end of the drain pipe penetrates at the outer periphery of the rising part. A lid is attached to the opening at the other end of the drain pipe.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

Patent Document 3

Summary of the Invention

Problems to be Solved by the Invention

[0005] The problem to be solved by the technology disclosed in this specification is to prevent the sleeve pipe embedded in the reinforced concrete foundation structure from adversely affecting the strength and reinforcement of the ground beam of the foundation structure.

Means for Solving the Problems

[0006] To solve the above problems, the structure comprises: an underground beam embedded in the ground; a rising section that extends upward from the upper end of the underground beam, is formed integrally with the underground beam, has a lower section embedded in the ground, and has an upper section that protrudes upward from the ground; a slab that extends horizontally from the rising section at a position below the upper end of the rising section; and a sleeve pipe that is embedded in the slab and the rising section from the upper surface of the slab to the outer circumferential surface of the rising section, has a first end that opens on the upper surface of the slab, and a second end that opens on the outer circumferential surface of the rising section and is embedded in the ground. The slab extends horizontally above the boundary between the rising portion and the underground beam, and the boundary between the rising portion and the underground beam is set at a position equal to the cover thickness of the underground beam, from the upper end of the shear reinforcement bars of the underground beam. The foundation structure is provided. To solve the above problems, a ground beam embedded in the ground, a rising section that extends upward from the upper end of the ground beam and is formed integrally with the ground beam, has a lower part embedded in the ground and an upper part that protrudes upward from the ground, a slab that extends horizontally from the rising section at a position below the upper end of the rising section, and is embedded in the slab and the rising section from the upper surface of the slab to the outer circumferential surface of the rising section, and on the upper surface of the slab A foundation structure is provided comprising a sleeve pipe having a first end that opens and a second end that opens on the outer surface of the rising portion and is embedded in the ground, wherein the slab extends horizontally above the boundary between the rising portion and the underground beam, and the boundary between the rising portion and the underground beam is set at a distance from the upper end of the shear reinforcement of the underground beam to the cover thickness from the side surface of the shear reinforcement of the underground beam to the side surface of the concrete of the underground beam. [Effects of the Invention]

[0007] Since the sleeve pipe is not embedded inside the underground beam, it does not adversely affect the strength or reinforcement of the underground beam. [Brief explanation of the drawing]

[0008] [Figure 1] Figure 1 is a vertical cross-sectional view of the outer perimeter of the foundation structure. [Figure 2] Figure 2 is a vertical cross-sectional view of the outer periphery of the modified foundation structure. [Figure 3] Figure 3 is a vertical cross-sectional view of the process of constructing the foundation structure. [Figure 4] Figure 4 is a vertical cross-sectional view of the process after the process shown in Figure 3. [Figure 5] Figure 5 is a vertical cross-sectional view of the process after the process shown in Figure 4. [Figure 6] Figure 6 is a vertical cross-sectional view of the process after the process shown in Figure 5. [Figure 7] Figure 7 is a vertical cross-sectional view of the process after the process shown in Figure 6. [Figure 8] Figure 8 is a vertical cross-sectional view of the process after the process shown in Figure 6. [Modes for carrying out the invention]

[0009] [Summary of Disclosure] This specification discloses the following foundation structures and methods for constructing them. The reference numerals indicated in parentheses below are referenced in Figures 1 to 8. The reference numerals indicated in parentheses are included for the purpose of facilitating understanding of the foundation structures and methods for constructing them, and therefore the scope of the present invention is not limited to the examples shown in the drawings.

[0010] [1] The foundation structure (1) comprises an underground beam (20), a rising section (30), and a sleeve pipe (50). The underground beam (20) is embedded in the ground (9). The rising section (30) rises from the upper end of the underground beam (20) so as to extend upward from the underground beam (20). The rising section (30) is formed integrally with the underground beam (20). The rising section (30) has a lower part that is embedded in the ground (9). The rising section (30) has an upper part that protrudes upward from the ground. The slab (40) extends horizontally from the rising section (30) at a position below the upper end of the rising section (30). The sleeve pipe (50) is embedded in the slab (40) and the rising portion (30) from the upper surface (44) of the slab (40) to the outer circumferential surface (31) of the rising portion (30). The sleeve pipe (50) has a first end (52) that opens on the upper surface (44) of the slab (40). The sleeve pipe (50) has a second end (54) that opens on the outer circumferential surface (31) of the rising portion (30) and is embedded in the ground (9).

[0011] According to [1], the sleeve pipe (50) is embedded in the slab (40) and the rising section (30) from the upper surface (44) of the slab (40) to the outer surface (31) of the rising section (30). Therefore, the sleeve pipe (50) is not embedded inside the underground beam (20). This contributes to the fact that the sleeve pipe (50) does not adversely affect the strength and reinforcement of the underground beam (20).

[0012] 〔2〕 The slab (40) extends horizontally at a position above the boundary (60) between the rising portion (30) and the underground beam (20). The boundary (60) between the rising portion (30) and the underground beam (20) is set at the position of the covering thickness of the underground beam (20) from the upper end of the shear reinforcement of the underground beam (20).

[0013] According to 〔2〕, the height of the underground beam (20), that is, the beam formation becomes lower, and the second end portion (54) of the sleeve pipe (50) is likely to be buried in the ground (9). A design in which the second end portion (54) of the sleeve pipe (50) is buried in the ground (9) can be easily performed.

[0014] 〔3〕 The sleeve pipe (50) extends obliquely downward from the upper surface (44) of the slab (40) and is bent toward the outer peripheral surface (31) of the rising portion (30) inside the slab (40).

[0015] According to 〔3〕, it is easy to install pipes of the equipment system, such as water supply pipes, sewer pipes or gas pipes, inside the sleeve pipe (50). It is easy to pass wiring of the electrical equipment system, such as power cables or electrical signal lines, through the sleeve pipe (50).

[0016] 〔4〕 The foundation structure (1) further includes a pressure-resistant plate (10). The pressure-resistant plate (10) is buried in the ground (9). The underground beam (20) is integrated with the pressure-resistant plate (10) on the outer periphery of the pressure-resistant plate (10).

[0017] According to 〔4〕, the load of the building main body above the foundation structure (1) is evenly distributed to the ground (9) through the pressure-resistant plate.

[0018] [5] The method for constructing the foundation structure (1) is to construct an underground beam (20) in a recess in the ground (9), to place a sleeve pipe (50) on the underground beam (20), orient the opening of the first end (52) of the sleeve pipe (50) upward inward from the inner circumferential surface of the underground beam (20), and orient the opening of the second end (54) of the sleeve pipe (50) outward from the outer circumferential surface (21) of the underground beam (20) at a position above the upper end of the underground beam (20) and below the first end (52) of the sleeve pipe (50), and to extend the rising portion (30) upward from the underground beam (20) so that the rising portion rises from the upper end of the underground beam (20) The process includes the steps of constructing 30) integrally with the underground beam (20), and constructing the slab (40) integrally with the rising portion (30) at a position below the upper end of the rising portion (30) so as to extend horizontally from the rising portion (30), thereby opening the first end (52) of the sleeve pipe (50) on the upper surface (44) of the slab (40) and opening the second end (54) of the sleeve pipe (50) on the outer peripheral surface (31) of the rising portion (30), and backfilling the recess in the ground (9) with soil and burying the second end of the sleeve pipe (50) in the soil.

[0019] According to [5], since the sleeve pipe (50) is embedded in the slab (40) and the rising section (30) from the upper surface (44) of the slab (40) to the outer surface (31) of the rising section (30), the sleeve pipe (50) does not need to be embedded inside the underground beam (20). Therefore, this contributes to preventing the sleeve pipe (50) from adversely affecting the strength and reinforcement of the underground beam (20).

[0020] The features, objectives, and advantages of the foundation structures and construction methods described above will become clear from the drawings illustrating preferred embodiments and the explanations using those drawings.

[0021] [Embodiment] Embodiments will be described below with reference to the drawings. The features and technical effects of the embodiments will be understood from the following detailed description and drawings. However, the scope of the present invention is not limited to the embodiments disclosed below. The scope of the present invention is not limited to the examples in the drawings, as the drawings are provided for illustrative purposes only.

[0022] <1. Basic structure> Figure 1 is a cross-sectional view of the outer perimeter of the foundation structure 1. The foundation structure 1 is a reinforced concrete (RC) structure that supports the building body constructed on top of it. The foundation structure 1 receives the load of the building body and transmits that load to the ground 9. Part of the foundation structure 1 is buried in the ground, and the remaining part protrudes above the ground. The foundation structure 1 is constructed on lean concrete 2. The lean concrete 2 is below ground level and is covered with crushed stone 3. The crushed stone 3 is laid below ground level.

[0023] The foundation structure 1 includes a pressure-resistant slab 10, underground beams 20, rising sections 30, a slab 40, sleeve pipes 50, and backfill soil 70.

[0024] The pressure-resistant slab 10 extends horizontally on top of the lean concrete 2. Therefore, the load of the building body on top of the foundation structure 1 is evenly distributed to the ground 9 through the pressure-resistant slab 10.

[0025] The pressure-resistant slab 10 has concrete and a reinforced concrete assembly. The concrete of the pressure-resistant slab 10 is poured so as to spread horizontally on top of the lean concrete 2. The reinforced concrete assembly is embedded in the concrete of the pressure-resistant slab 10. The reinforced concrete assembly is composed of many reinforcing bars. The reinforced concrete assembly is assembled in a grid pattern along the horizontal plane at a position above the lean concrete 2. The reinforcing bars of the reinforced concrete assembly may be arranged in two or more layers vertically. For example, the reinforced concrete assembly may be single-reinforced or double-reinforced. Single reinforcement refers to a grid-like set arranged in one layer. Double reinforcement refers to a grid-like set arranged in two layers vertically.

[0026] The underground beam 20 rises from the pressure slab 10 on its outer perimeter. The underground beam 20 is buried in the ground. The underground beam 20 is formed integrally with the pressure slab 10. The underground beam 20 has concrete 22 and a beam reinforcement assembly 24. The concrete 22 is poured so as to rise from the pressure slab 10 on its outer perimeter. The beam reinforcement assembly 24 is embedded in the concrete 22. The outer perimeter of the reinforcement assembly of the pressure slab 10 is also embedded in the concrete 22. The beam reinforcement assembly 24 has a plurality of main reinforcements 26 and a plurality of shear reinforcements 28. The shear reinforcements 28 are bent into a rectangular shape. The shear reinforcements 28 are arranged horizontally at intervals along the outer perimeter of the pressure slab 10. The shear reinforcements 28 surround the sets of main reinforcements 26 and are assembled to the main reinforcements 26. The main reinforcements 26 extend horizontally along the outer perimeter of the pressure slab 10. The main reinforcement bars 26 are arranged at intervals along the shear reinforcement bars 28, inside the shear reinforcement bars 28. The upper end of such a beam reinforcement assembly 24, that is, the upper end of the shear reinforcement bars 28, is located below ground level.

[0027] Furthermore, a second underground beam similar to the underground beam 20 is provided on the inner side of the outer perimeter of the pressure-resistant slab 10, and the second underground beam is integrally formed with the pressure-resistant slab 10.

[0028] The rising section 30 is constructed on top of the underground beam 20. The rising section 30 rises from the upper end of the underground beam 20 so as to extend upward from the underground beam 20. The rising section 30 is formed integrally with the underground beam 20. The lower part of the rising section 30 is embedded in the ground, and the upper part of the rising section 30 protrudes upward from the ground. A construction joint exists at the boundary 60 between the rising section 30 and the underground beam 20. A construction joint refers to the boundary between the concrete 22 of the underground beam 20 and the concrete of the rising section 30. The boundary 60 between the rising section 30 and the underground beam 20 is below ground level. The boundary 60 is set at a position above the upper end of the beam reinforcement assembly 24, that is, above the upper end of the shear reinforcement 28, by the thickness of the concrete cover of the underground beam 20. The concrete cover thickness of the underground beam 20 may be defined, for example, by the thickness from the side of the beam reinforcement assembly 24 (i.e., the side of the shear reinforcement 28) to the side of the concrete 22 (i.e., the outer surface 21 of the underground beam 20). The distance from the top of the beam reinforcement assembly 24 to the boundary 60 is equal to the concrete cover thickness from the side of the shear reinforcement 28 to the outer surface 21 of the underground beam 20.

[0029] The rising section 30 has multiple rising reinforcements, multiple main reinforcements, and concrete. Rising reinforcements are also called shear reinforcements. Multiple rising reinforcements extend in the vertical direction. These rising reinforcements are arranged horizontally at intervals along the outer circumference of the pressure-resistant slab 10. The main reinforcements of the rising section 30 extend horizontally along the outer circumference of the pressure-resistant slab 10. The rising reinforcements may be arranged in a U-shape or C-shape. The lower part of the rising reinforcements is embedded in the concrete 22 of the underground beam 20, and the upper part of the rising reinforcements is embedded in the concrete of the rising section 30. The upper part of the rising reinforcements may protrude upward from the upper end surface of the concrete of the rising section 30. The main reinforcements of the rising section 30 extend horizontally along the outer circumference of the pressure-resistant slab 10. The main reinforcements of the rising section 30 are arranged at intervals in the vertical direction. The main reinforcement of the rising section 30 is assembled to the rising reinforcement of the rising section 30. Anchor bolts used to fasten the main building body to the foundation structure 1 may also be provided in the rising section 30. The lower part of the anchor bolt is embedded in the concrete of the rising section 30, and the upper part of the anchor bolt protrudes upward from the upper end of the rising section 30.

[0030] The slab 40 extends horizontally at a position above the pressure-resistant slab 10. The outer periphery of the slab 40 is joined to the rising portion 30. The slab 40 is formed integrally with the rising portion 30. The upper surface 44 of the slab 40 is below the upper end 32 of the rising portion 30, and the rising portion 30 protrudes upward from the upper surface 44 of the slab 40 on its outer periphery. The lower surface 42 of the slab 40 is above the boundary 60, and the rising portion 30 protrudes downward from the lower surface 2 of the slab 40 on its outer periphery.

[0031] Slab 40 has concrete and slab reinforcement. The concrete of slab 40 is poured so as to spread horizontally at a position above the pressure slab 10. The slab reinforcement assemblies are embedded in the concrete of slab 40. The slab reinforcement assemblies are assembled in a grid pattern along the horizontal plane at a position above the pressure slab. The slab reinforcement assemblies may be reinforced in one or more layers vertically. For example, the slab reinforcement assemblies may be single reinforcement or double reinforcement. Single reinforcement refers to a grid-like set arranged in one layer. Double reinforcement refers to a grid-like set arranged in two layers vertically. The outer periphery of the slab reinforcement assemblies is embedded in the concrete of the rising section 30.

[0032] The sleeve pipe 50 is embedded in the concrete of the slab 40 and the rising section 30 from the upper surface 44 of the slab 40 to the outer surface 31 of the rising section 30. The sleeve pipe 50 extends downward from the upper surface 44 of the slab 40 and is bent inside the slab 40 toward the outer surface 31 of the rising section 30. The sleeve pipe 50 extends diagonally with respect to the vertical direction from its bend to the upper surface 44 of the slab 40. However, as shown in Figure 2, the sleeve pipe 50 may extend vertically from its bend to the upper surface 44 of the slab 40. As shown in Figures 1 and 2, the sleeve pipe 50 extends horizontally from its bend to the outer surface 31 of the rising section 30. However, the sleeve pipe 50 may slope downward from its bend to the outer surface 31 of the rising section 30. The first end 52 of the sleeve pipe 50 opens on the upper surface 44 of the slab 40, and the second end 54 of the sleeve pipe 50 opens on the outer surface 31 of the rising section 30. The second end 54 of the sleeve pipe 50 is embedded in the ground 9.

[0033] The sleeve pipe 50 is used, for example, as piping for equipment systems. For example, water supply pipes such as tap water may be passed through the sleeve pipe 50. Drainage pipes such as sewage pipes may be passed through the sleeve pipe 50. Gas pipes may be passed through the sleeve pipe 50. Power cables may be passed through the sleeve pipe 50. Electrical signal lines may be passed through the sleeve pipe 50.

[0034] If the diameter of the sleeve pipe 50 is large, the thickness of the outer circumference of the slab 40 may be increased downwards, thereby forming a protrusion 48 on the lower surface 42 of the slab 40. This prevents the sleeve pipe 50 from protruding downwards from the lower surface 42 of the slab 40, and allows the sleeve pipe 50 to be embedded in the concrete of the slab 40. A retaining plate for preventing the concrete of the protrusion 48 from flowing may remain on the side surface of the protrusion 48.

[0035] In the example shown in Figure 2, the sleeve pipe 50 may be used as a drain pipe. In this case, rainwater on the slab 40 flows out through the sleeve pipe 50 to the ground 9 and infiltrates into the ground 9. When the sleeve pipe 50 is used as a drain pipe, a wire mesh or perforated plate may be provided at the opening at the second end 54 of the sleeve pipe 50. The wire mesh or perforated plate prevents soil and sand from entering the sleeve pipe 50.

[0036] In the example shown in Figure 2, the upper surface 44 of the slab 40 is recessed around the first end 52 of the sleeve pipe 50, and the level of the first end 52 of the sleeve pipe 50 is aligned with the level of the bottom of the recess 46.

[0037] Backfill soil 70 is filled between slab 40 and pressure-resistant slab 10.

[0038] <2. Method for constructing the foundation structure> As shown in Figure 3, a depression 9 is formed in the ground 9 by excavating the ground at the site. Next, the bottom of the depression 9 is leveled, and crushed stone 2 is laid at the bottom of the depression 9. Then, lean concrete 2 is poured on top of the crushed stone 2.

[0039] Next, the reinforcement bars of the pressure-resistant slab 10 are placed on top of the lean concrete 2, thereby assembling the reinforcement assembly of the pressure-resistant slab 10 on top of the lean concrete 2. Furthermore, as shown in Figure 4, the main reinforcement bars 26 and shear reinforcement bars 26 of the underground beam 20 are placed on the outer periphery of the reinforcement assembly of the pressure-resistant slab 10, thereby assembling the beam reinforcement assembly 24 of the underground beam 20. Furthermore, the vertical reinforcement bars of the vertical section 30 are placed on top of the outer periphery of the reinforcement assembly of the pressure-resistant slab 10.

[0040] Before or after the reinforcement work, or in parallel with the reinforcement work, formwork for the underground beam 20 is assembled. Specifically, the first side formwork 81 is assembled on one side of the beam reinforcement assembly 24 along the outer circumference of the reinforcement assembly of the pressure slab 10, and the second side formwork 82 is assembled on the other side of the beam reinforcement assembly 24 so that it is parallel to the first side formwork 81 inside the first side formwork 81. The first side formwork 81 is for damming the fresh concrete of the underground beam 20 and the rising section 30 at the outer circumferential surfaces 21, 31 of the underground beam 20 and the rising section 30. The lower end of the first side formwork 81 is in contact with the lean concrete 2. The second side formwork 82 is for damming the fresh concrete of the underground beam 20 at the inner circumferential surface 23 of the underground beam 20. The second side formwork 82 is a floating formwork that is separated above the lean concrete 2. The upper end of the second formwork 82 is located higher than the boundary 60 between the rising section 30 and the underground beam 20.

[0041] Next, as shown in Figure 5, fresh concrete 83 is poured inside the second formwork 82 up to the lower end of the second formwork 82, and fresh concrete 83 is also poured between the first formwork 81 and the second formwork 82. After that, the fresh concrete 83 is cured to harden. This completes the pressure-resistant slab 10 and the underground beam 20. The upper surface of the hardened concrete between the first formwork 81 and the second formwork 82 is located at the boundary 60 between the rising section 30 and the underground beam 20.

[0042] Next, as shown in Figure 6, the second side formwork 82 is dismantled and removed. Next, backfill soil 70 is filled inside the underground beam 20. At this time, the backfill soil 70 is piled on top of the pressure-resistant slab 10 until the surface of the backfill soil 70 is aligned with the top surface of the hardened concrete between the first side formwork 81 and the second side formwork 82. Next, the weir board 84 is assembled on top of the backfill soil 70. The position of the weir board 84 is inside the inner circumference 23 of the underground beam 20. Next, backfill soil 70 is piled up inside the weir board 84.

[0043] The slab reinforcement is placed on top of the backfill soil 70 and the underground beam 20. The main reinforcement of the rising section 30 is placed on top of the underground beam 20.

[0044] Before or after the reinforcement work for the slab 40 and the rising section 30, or in parallel with the reinforcement work, the sleeve pipe 50 is placed on the upper end of the underground beam 20. At this time, the first end 52 of the sleeve pipe 50 is pointed upward inward from the inner circumferential surface 23 of the underground beam 20, and the opening of the second end 54 of the sleeve pipe 50 is pointed outward from the outer circumferential surface 21 of the underground beam 20 at a position above the upper end of the underground beam 20 and below the first end 52 of the sleeve pipe 50. In addition, by bringing the second end 54 of the sleeve pipe 50 into contact with the first side formwork 81, the opening of the second end 54 of the sleeve pipe 50 is closed by the first side formwork 81 and the sleeve pipe 50 is aligned with the outer circumferential surface 21 of the underground beam 20. The sleeve pipe 50 may also be placed on the upper surface of the hardened concrete between the first side formwork 81 and the second side formwork 82.

[0045] Next, the third formwork 85 is assembled above the location where the second formwork 82 was installed. At this time, the third formwork 85 is assembled next to the rising reinforcement of the rising section 30 so that the third formwork 85 is parallel to the first formwork 81 on the inside of the first formwork 81, and the third formwork 85 is positioned above the inner surface 23 of the underground beam 20, extending the inner surface 23 of the underground beam 20 upwards.

[0046] Next, as shown in Figure 7, fresh concrete 86 is poured between the weir plate 84 and the first side formwork 81, thereby embedding a portion of the sleeve pipe 50 in the fresh concrete 86. Furthermore, the fresh concrete 86 is allowed to overflow from the weir plate 84 and poured up to the bottom end of the third side formwork 85, thereby embedding the slab reinforcement and sleeve pipe 50 in the fresh concrete 86. In addition, fresh concrete 86 is poured between the first side formwork 81 and the third side formwork 85, embedding the rising reinforcement in the fresh concrete 86. After that, the fresh concrete 86 is cured to harden. This completes the slab 40 and the rising section 30.

[0047] Alternatively, as shown in Figure 8, instead of using the weir board 84, a step may be formed on the outer periphery of the upper part of the backfill soil 70, and the surface connecting the upper and lower steps may be sloped. In this case as well, fresh concrete 86 is poured in the same way as when the weir board 84 is used.

[0048] As described above, by pouring and hardening the fresh concrete 86, the rising section 30 is extended upward from the underground beam 20 and constructed integrally with the underground beam 20 so that it rises from the upper end of the underground beam 20. Furthermore, the slab 40 is constructed integrally with the rising section 30 so that it extends horizontally from the rising section 30 at a position above the boundary 60 between the rising section 30 and the underground beam 20 and below the upper end of the rising section 30. With the construction of the rising section 30 and the slab 40 in this manner, the sleeve pipe 50 is embedded in the slab 40 and the rising section 30, the first end 52 of the sleeve pipe 50 is opened on the upper surface 44 of the slab 40, and the second end 54 of the sleeve pipe 50 is opened on the outer circumferential surface 31 of the rising section 30.

[0049] Next, the first side formwork 81 and the third side formwork 85 are dismantled and removed.

[0050] After passing the equipment pipes or electrical equipment wiring through the sleeve pipe 50, the second end 54 of the sleeve pipe 50 is buried in soil by backfilling the recess 8 with soil.

[0051] <3. Summary> The sleeve pipe 50 is embedded in the slab 40 and the rising section 30 from the upper surface 44 of the slab 40 to the outer surface 31 of the rising section 30. Therefore, the sleeve pipe 50 is not embedded inside the underground beam 20. Thus, the sleeve pipe 50 does not adversely affect the strength and reinforcement of the underground beam 20.

[0052] Since the slab 40 extends horizontally above the boundary 60 between the rising section 30 and the underground beam 20, and the boundary 60 is set at the position from the upper end of the shear reinforcement bars 28 of the underground beam 20 to the cover thickness of the underground beam 20, the beam depth of the underground beam 20 is reduced. This contributes to embedding the sleeve pipe 50 in the rising section 30 without embedding it in the underground beam 20. Therefore, the second end 54 of the sleeve pipe 50 is easily embedded in the ground 9, and such a design can be easily carried out.

[0053] The sleeve pipe 50 extends diagonally downward from the upper surface 44 of the slab 40, and is bent towards the outer surface 31 of the rising portion 30 inside the slab 40. Therefore, it is easy to install utility pipes, such as water supply pipes, sewage pipes, or gas pipes, inside the sleeve pipe 50. Electrical wiring, such as power cables or electrical signal lines, is also easily routed through the sleeve pipe 50.

[0054] Since the sleeve pipe 50 is embedded in the slab 40 and the rising section 30 from the upper surface of the slab 40 to the outer surface 31 of the rising section 30, water inside the rising section 30 and on top of the slab 40 is easily discharged to the ground 9 through the sleeve pipe 50. Because the second end 54 of the sleeve pipe 50 is embedded in the ground 9, it is difficult for rainwater and air from outside to penetrate inside the rising section 30 through the sleeve pipe 50. Therefore, the sleeve pipe 50 can also be used as a drain pipe. In particular, because the sleeve pipe 50 extends downward from the upper surface 44 of the slab 40 and is bent towards the outer surface 31 of the rising section 30 inside the slab 40, water inside the rising section 30 is easily discharged to the ground 9 through the sleeve pipe 50. Even if water seeps from the ground 9 into the sleeve pipe 50, it is difficult for that water to flow inside the rising section 30.

[0055] As shown in Figure 2, the upper surface of the slab 40 is recessed around the first end 52 of the sleeve pipe 50, so water on the slab 40 can easily flow into the sleeve pipe 50, and the water can easily be discharged into the ground 9 through the sleeve pipe 50.

[0056] Foundation structure 1 is suitable for supporting the load of a wooden building. The energy used from the production of the building's raw materials and rafters to their disposal is less than the energy used from the production to disposal of metal or concrete materials. Therefore, this foundation structure 1 contributes to the realization of a decarbonized society by promoting carbon neutrality, which effectively reduces carbon dioxide emissions to zero, and to the achievement of the Sustainable Development Goals (SDGs).

[0057] The embodiments disclosed herein are for illustrative purposes only and are not intended to limit the scope of the invention. The scope of the invention should be interpreted by the terms of the claims. [Explanation of symbols]

[0058] 1 Basic structure 9 ground) 20 Underground beam 21 Outer surface 28 Shear reinforcement bars 30. Rising section 31 Outer surface 40 slabs 44 Top side 50 sleeve pipes 52 First end 54 Second end 60 boundaries

Claims

1. Underground beams embedded in the ground, A rising portion having an upper part that protrudes upward from the ground beam, extending upward from the upper end of the ground beam, forming integrally with the ground beam, having a lower part that is embedded in the ground, and an upper part that protrudes upward from the ground, At a position below the upper end of the aforementioned rising portion, a slab extending horizontally from the rising portion, A sleeve pipe is embedded in the slab and the rising portion from the upper surface of the slab to the outer circumferential surface of the rising portion, having a first end that opens on the upper surface of the slab, and a second end that opens on the outer circumferential surface of the rising portion and is embedded in the ground, Equipped with, The slab extends horizontally above the boundary between the rising portion and the underground beam, and the boundary between the rising portion and the underground beam is set at a position equal to the concrete cover thickness of the underground beam from the upper end of the shear reinforcement bars of the underground beam.

2. Underground beams embedded in the ground, A rising portion having an upper part that protrudes upward from the ground beam, extending upward from the upper end of the ground beam, forming integrally with the ground beam, having a lower part that is embedded in the ground, and an upper part that protrudes upward from the ground, At a position below the upper end of the aforementioned rising portion, a slab extending horizontally from the rising portion, A sleeve pipe is embedded in the slab and the rising portion from the upper surface of the slab to the outer circumferential surface of the rising portion, having a first end that opens on the upper surface of the slab, and a second end that opens on the outer circumferential surface of the rising portion and is embedded in the ground, Equipped with, The slab extends horizontally above the boundary between the rising section and the underground beam, and the boundary between the rising section and the underground beam is set at a distance equal to the concrete cover thickness from the upper end of the shear reinforcement of the underground beam to the side surface of the concrete of the underground beam. Basic structure.

3. The sleeve pipe extends downward from the upper surface of the slab and is bent within the slab toward the outer surface of the rising portion. The foundation structure according to claim 1 or 2.

4. The aforementioned ground is equipped with a pressure-resistant slab embedded in it, The underground beam is integrated with the pressure slab on the outer circumference of the pressure slab. The foundation structure according to claim 1 or 2.

5. A step of constructing an underground beam in a recess by pouring concrete from the upper end of the shear reinforcement bars up to the cover thickness of the underground beam so as to embed the shear reinforcement bars of the underground beam in the concrete of the underground beam inside the recess of the ground, The steps include: positioning a sleeve pipe on the upper end of the concrete of the underground beam, orienting the opening of the first end of the sleeve pipe upward inward from the inner circumferential surface of the underground beam, and orienting the opening of the second end of the sleeve pipe outward from the outer circumferential surface of the underground beam at a position above the upper end of the concrete of the underground beam and below the first end of the sleeve pipe; The process involves constructing the rising portion integrally with the underground beam so that it extends upward from the underground beam and rises from the upper end of the underground beam, and constructing the slab integrally with the rising portion so that it extends horizontally from the rising portion at a position below the upper end of the rising portion, thereby embedding the sleeve pipe in the slab and the rising portion, opening the first end of the sleeve pipe on the upper surface of the slab, and opening the second end of the sleeve pipe on the outer circumferential surface of the rising portion, The steps include backfilling the recess in the ground with soil and burying the second end of the sleeve pipe in the soil, A method for constructing a basic structure that includes this.

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