Precast concrete foundation

Abstract

To provide a precast concrete foundation having high shearing strength in both vertical and horizontal directions in a joint part of a concrete foundation block, and having no risk of locally reducing the shearing strength in an area of a filling port of a grout material.SOLUTION: A precast concrete foundation 100 for supporting an upper structure of a building is formed by facing a first end face 12 of one of a plurality of precast concrete foundation blocks 10 and a second end face 13 of the other of the plurality of precast concrete foundation blocks 10, which are adjacent to each other, with a gap G therebetween and filling the gap G with a grout material 30.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a precast concrete foundation. [Background technology]

[0002] In order to shorten the construction period for building foundations and increase the dimensional accuracy of the foundation, a construction method is applied in which the rising portion of the foundation is manufactured as a concrete foundation block (precast concrete foundation block) in a factory, and these concrete foundation blocks are transported to the construction site and used for foundation construction. By laying multiple concrete foundation blocks transported to the construction site in the direction of the foundation extension, and constructing footings on site below the rising portion of the concrete foundation blocks so that they are integrated with the rising portion, the construction period for foundations such as strip footings can be significantly shortened.

[0003] In precast concrete foundations, adjacent concrete foundation blocks are joined by filling the gaps between them in the extension direction of the foundation with grout material.In order to increase the shear strength at the joint, shear cotters are provided on the opposing end faces of both concrete foundation blocks, and the grout material filled in the gaps between the end faces is allowed to penetrate into the shear cotters and harden.

[0004] Box-shaped shear cotters are commonly used for this purpose, but because the area required to bear shear force is generally small, they pose a problem in terms of shear strength. Patent Document 1 proposes a precast concrete foundation material that solves this problem. The shear cotter provided on the end surface of the precast concrete foundation material disclosed therein has a shape in which multiple protrusions of a certain height are arranged horizontally at equal intervals, one above the other, and this configuration results in a wavy shear cotter with alternating peaks and valleys of a predetermined height. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2017-25667 Summary of the Invention [Problem to be solved by the invention]

[0006] The precast concrete foundation material described in Patent Document 1 is a wavy shear cotter with alternating peaks and valleys of a certain height formed in the horizontal direction, so while it has high vertical shear strength, it has issues with its resistance to horizontal shear force and torsion.

[0007] In addition, in Patent Document 1, a relatively large box-shaped grout filling port is provided at the top of the end face of the precast concrete foundation material, and since there is no wavy shear cotter in the area of ​​this filling port, the shear strength is significantly reduced locally.

[0008] The present invention has been made in consideration of the above-mentioned problems, and aims to provide a precast concrete foundation consisting of a plurality of precast concrete foundation blocks joined in the extension direction of the foundation, in which the joints of the concrete foundation blocks have high shear strength in both the vertical and horizontal directions, and there is no risk of localized reduction in shear strength in the area of ​​the grout filling port. [Means for solving the problem]

[0009] In order to achieve the above object, one aspect of the precast concrete foundation according to the present invention is as follows: A precast concrete foundation for supporting a superstructure of a building, which is formed by a plurality of precast concrete foundation blocks, in which a first end face of one adjacent concrete foundation block faces a second end face of the other adjacent concrete foundation block with a gap therebetween, and the gap is filled with grout material; Both the first end face and the second end face are provided with a plurality of pyramidal or truncated pyramidal protrusions arranged in vertical and horizontal directions, The protrusions on both the first end face and the second end face face each other.

[0010] According to this aspect, the first end face of one adjacent concrete foundation block and the second end face of the other adjacent concrete foundation block are both provided with a plurality of pyramidal or truncated pyramidal convex portions arranged in the vertical and horizontal directions, and the convex portions on the first end face and the second end face are facing each other and grout material is filled in the gaps.This results in a joint in which narrow regions where the convex portions on the first end face and the second end face face each other and wide regions where the concave portions between the convex portions face each other are arranged in a staggered pattern in the vertical and horizontal directions, thereby forming a precast concrete foundation that has high resistance to vertical shear forces and, further, high resistance to horizontal shear forces and torsion.

[0011] Furthermore, multiple convex portions are lined up vertically to form rows, and rows of vertically extending concave stripes are formed between adjacent rows of convex portions horizontally.These concave stripes serve as filling ports for the grout material, and multiple convex portions, which are shear cotters, are arranged vertically on the sides of each concave strip, so there is no risk of a significant local decrease in shear strength in the filling port area.

[0012] Here, pyramidal convex portions include triangular, quadrangular, and pentagonal or higher-sided pyramids. Furthermore, truncated pyramidal convex portions are those in which the tip of a pyramid such as a triangular or quadrangular pyramid is cut off to have a flat tip surface.

[0013] Another aspect of the precast concrete foundation according to the present invention is A precast concrete foundation for supporting a superstructure of a building, which is formed by a plurality of precast concrete foundation blocks, in which a first end face of one adjacent concrete foundation block faces a second end face of the other adjacent concrete foundation block with a gap therebetween, and the gap is filled with grout material; Both the first end surface and the second end surface are provided with a plurality of pyramidal or truncated pyramidal convex portions and concave portions arranged in the vertical and horizontal directions, alternating in the vertical and horizontal directions; The convex portions of the first end face and the second end face face each other, and the concave portions of the first end face and the second end face face each other.

[0014] According to this aspect, on both the first end face of one adjacent concrete foundation block and the second end face of the other adjacent concrete foundation block, a plurality of pyramidal or truncated pyramidal convex and concave portions are arranged vertically and horizontally, alternating between the vertical and horizontal directions, and grout material is filled into the gaps with the convex portions on the first end face and the concave portions facing each other on the first end face and the second end face, thereby forming a joint in which narrow regions where the convex portions on the first end face and the second end face face each other and wide regions where the concave portions face each other are arranged in a staggered pattern in the vertical and horizontal directions, thereby forming a precast concrete foundation with high resistance to vertical shear forces and, further, high resistance to horizontal shear forces and torsion.

[0015] Furthermore, multiple convex portions and concave portions are lined up in a vertical row, and between adjacent rows of convex portions and concave portions in the horizontal direction, a row of vertically extending concave stripes is formed, which serve as filling ports for the grout material.Since multiple convex portions and concave stripes, which are shear cotters, are arranged vertically on the sides of the multiple vertically extending concave stripes, there is no risk of a significant local decrease in shear strength in the filling port area.

[0016] Here, the pyramidal recesses include triangular pyramids, square pyramids, and pyramids with five or more sides. Furthermore, the truncated pyramidal recesses are those in which the tip of a pyramid such as a triangular pyramid or a square pyramid is cut off to have a flat bottom.

[0017] Another aspect of the precast concrete foundation according to the present invention is the pyramidal convex or concave portion is a quadrangular pyramid, The truncated pyramidal convex or concave portion is a truncated square pyramid.

[0018] According to this aspect, since the pyramidal convex or concave portions are square pyramids and the truncated pyramidal convex or concave portions are truncated square pyramids, the grout material filled in the gaps can flow smoothly in both the vertical and horizontal directions, resulting in excellent grout filling properties and allowing the formation of a precast concrete foundation in which the grout material is densely filled into the pyramidal or truncated pyramidal convex or concave portions. [Effects of the Invention]

[0019] As can be understood from the above explanation, the precast concrete foundation of the present invention can provide a precast concrete foundation that has high shear strength in both the vertical and horizontal directions at the joints of the concrete foundation blocks, and that does not have the risk of localized reduction in shear strength in the area of ​​the grout filling port. [Brief explanation of the drawings]

[0020] [Figure 1] FIG. 1 is a side view of an example of a precast concrete foundation according to an embodiment. [Figure 2] This is a view taken along the arrows II-II in Figure 1, and is a front view of an example of the first end face and second end face of a concrete foundation block, with the grout material filled in the gaps omitted. [Figure 3] 3 is a view taken in the direction of the arrow III in FIG. 1, and is a plan view of an example of a joint between two concrete foundation blocks as seen from above. [Figure 4] 4 is a view taken along the line IV-IV in FIG. 3, and is a vertical cross-sectional view of an example of a joint between two concrete foundation blocks cut inside the outer frame. FIG. [Figure 5] 3 is a view corresponding to FIG. 2 and is a front view of another example of the first end face and the second end face of the concrete foundation block. FIG. [Figure 6] This is a figure corresponding to Figure 2 and is a front view of another example of the first end face and second end face of a concrete foundation block, with the grout material filled in the gaps omitted. [Figure 7]This is a plan view of another example of a joint between two concrete foundation blocks. [Figure 8] 8 is a view taken along the arrows VIII-VIII in FIG. 7, and is a vertical cross-sectional view of yet another example of a joint between two concrete foundation blocks cut inside the outer frame. DETAILED DESCRIPTION OF THE INVENTION

[0021] Hereinafter, an example of a precast concrete foundation according to an embodiment will be described with reference to the accompanying drawings. In this specification and drawings, substantially identical components will be designated by the same reference numerals, and redundant description may be omitted.

[0022] [Precast concrete foundation according to the embodiment] An example of a precast concrete foundation according to an embodiment will be described with reference to Figs. 1 to 8. Fig. 1 is a side view of an example of a precast concrete foundation according to an embodiment. Fig. 2 is a view taken along arrows II-II in Fig. 1, showing an example of a first end face and a second end face of a concrete foundation block, with the grout filling the gaps omitted. Fig. 3 is a view taken along arrow III in Fig. 1, showing an example of a joint between two concrete foundation blocks as viewed from above. Fig. 4 is a view taken along arrows IV-IV in Fig. 3, showing a vertical cross-sectional view of an example of a joint between two concrete foundation blocks cut inside the outer frame.

[0023] The concrete foundation block 10 shown in the figure is a precast foundation block that forms the rising portion of the foundation, and is manufactured in a factory and transported to the site to form a foundation such as a strip footing. As shown in Figure 1, the concrete foundation block 10 has a plurality of upper and lower end bars (not shown) that extend in the extension direction of the foundation, a plurality of stirrups (not shown) that connect the upper and lower end bars in the vertical direction and are arranged at a predetermined pitch in the extension direction, and a plurality of web bars (not shown) that are located between the upper and lower end bars and extend in the extension direction.

[0024] The multiple concrete foundation blocks 10 transported to the site are arranged in the extension direction of the foundation, for example, along the exterior wall of the building, and grout material 30 is filled into the gaps G between the first end faces 12 and second end faces 13 of adjacent concrete foundation blocks 10 to form joints 40, thereby forming a precast concrete foundation 100 that will serve as the rising part of, for example, a strip footing. A reinforced concrete footing 50, shown by a dashed line, is constructed on site so as to be integrated with the bottom ends 11 of each concrete foundation block 10 that forms the precast concrete foundation 100, thereby forming a foundation such as a strip footing.

[0025] Both the first end face 12 and the second end face 13 of the concrete foundation block 10 shown in Figure 2 are provided with shear cotters consisting of multiple truncated pyramidal protrusions 20 arranged vertically and horizontally inside the outer frame 15.

[0026] More specifically, a plurality of truncated pyramidal protrusions 20 are aligned in the vertical and horizontal directions, and recesses 25 are formed between the plurality of protrusions 20 aligned in the vertical direction.

[0027] Here, the truncated pyramidal protrusions 20 in the illustrated example are truncated square pyramids, but other shapes such as truncated triangular pyramids, truncated pentagonal pyramids, truncated hexagonal pyramids, etc. may also be used, and pyramidal protrusions such as square pyramids, pentagonal pyramids, hexagonal pyramids, etc. For example, Fig. 5 shows an example in which truncated hexagonal pyramidal protrusions 20A are aligned in the vertical and horizontal directions on the first end face 12 and the second end face 13.

[0028] As shown in Figures 3 and 4, the convex portions 20 of both the first end face 12 and the second end face 13 face each other, and the concave portions 25 face each other, and grout material 30 is filled in the gap G between the first end face 12 and the second end face 13.

[0029] As shown in FIG. 2, on both the first end face 12 and the second end face 13, multiple protrusions 20 are arranged in a vertical direction to form rows, and vertically extending recesses 28 are formed between adjacent rows in the horizontal direction.

[0030] As a result, as shown in Figure 2, the grout material 30 can be smoothly filled in the vertical direction, i.e., the X1 direction, through each of the filling ports, using the multiple vertically extending grooves 28 as filling ports. During the filling process in the X1 direction, the grout material 30 is diverted into the horizontal direction, i.e., the X2 direction, through the recesses 25 on the left and right, allowing the grout material to be smoothly filled in the horizontal direction as well.

[0031] Furthermore, since multiple truncated pyramidal convex portions 20, which are shear cotters, are arranged vertically on the sides of the multiple recessed lines 28, which are the filling ports of the grout material 30, there is no risk of a significant local decrease in the shear strength of the joint 40 in the area of ​​the filling port.

[0032] Furthermore, as shown in Figure 3, the joint 40 has a planar shape in which a narrow region where the convex portions 20 of both the first end face 12 and the second end face 13 face each other and a roughly diamond-shaped wide region where the concave portions 25 of both the first end face 12 and the second end face 13 face each other are arranged in a staggered pattern in the horizontal direction, thereby making it possible to form a precast concrete foundation 100 having a joint 40 with high resistance to lateral shear forces and torsion.

[0033] Furthermore, as shown in Figure 4, the joint 40 has a side view shape in which a narrow region where the convex portions 20 of both the first end face 12 and the second end face 13 face each other and a roughly diamond-shaped wide region where the concave portions 25 of both the first end face 12 and the second end face 13 face each other are arranged in a staggered pattern in the vertical direction, thereby making it possible to form a precast concrete foundation 100 having a joint 40 with high resistance to vertical shear forces.

[0034] In this way, the precast concrete foundation 100 has high shear strength in both the vertical and horizontal directions at the joints 40 of multiple concrete foundation blocks 10 arranged in the extension direction, and is a precast concrete foundation that is not susceptible to localized reduction in shear strength in the area of ​​the grout material 30 filling port.

[0035] Next, another example of the joint between two concrete foundation blocks will be described with reference to Figures 6 to 8. Here, Figure 6 corresponds to Figure 2 and is a front view of another example of the first end face and second end face of the concrete foundation block, with the grout filling the gaps omitted. Also, Figure 7 is a plan view of another example of the joint between two concrete foundation blocks as seen from above, and Figure 8 is a view taken along arrows VIII-VIII in Figure 7 and is a vertical cross-sectional view of yet another example of the joint between two concrete foundation blocks cut inside the outer frame.

[0036] At the joint 40A between the two concrete foundation blocks 10 shown in the figure, both the first end face 12 and the second end face 13 of the concrete foundation block 10 shown in Figure 6 are provided with shear cotters consisting of multiple truncated pyramidal convex portions 20 and concave portions 26 arranged vertically and horizontally inside the outer frame 15.

[0037] More specifically, a plurality of truncated pyramidal convex portions 20 and concave portions 26 are aligned in the vertical and horizontal directions, and the convex portions 20 and concave portions 26 are alternately arranged in the vertical and horizontal directions.

[0038] Here, the truncated pyramidal convex portion 20 and concave portion 26 in the illustrated example are truncated square pyramids, but in addition to the illustrated example, they may be truncated triangular pyramids, truncated pentagonal pyramids, truncated hexagonal pyramids, etc., and pyramidal convex portions such as square pyramids, pentagonal pyramids, and hexagonal pyramids may also be applied.

[0039] As shown in Figures 7 and 8, the convex portions 20 of the first end face 12 and the second end face 13 face each other, and the concave portions 26 of the first end face 12 and the second end face 13 face each other, and grout material 30 is filled in the gap G between the first end face 12 and the second end face 13.

[0040] As shown in Figure 6, on both the first end face 12 and the second end face 13, multiple protrusions 20 and recesses 26 are lined up in the vertical direction to form rows, and vertically extending recesses 28 are formed between adjacent rows in the horizontal direction.

[0041] As a result, as shown in Figure 6, the grout material 30 can be smoothly filled in the vertical direction, i.e., the X1 direction, through each of the filling ports, using the multiple vertically extending grooves 28 as filling ports. During the filling process in the X1 direction, the grout material 30 is diverted into the horizontal direction, i.e., the X2 direction, through the recesses 26 on the left and right, allowing the grout material to be smoothly filled in the horizontal direction as well.

[0042] Furthermore, since multiple truncated pyramidal convex portions 20 and concave portions 26, which are shear cotters, are arranged alternately in the vertical direction on the sides of the multiple concave grooves 28, which are the filling ports of the grout material 30, there is no risk of a significant local decrease in the shear strength of the joint 40A in the filling port area.

[0043] Furthermore, as shown in Figure 7, the joint 40A has a planar shape in which a narrow region where the convex portions 20 of both the first end face 12 and the second end face 13 face each other and a roughly diamond-shaped wide region where the concave portions 25 of both the first end face 12 and the second end face 13 face each other are arranged in a staggered pattern in the horizontal direction, thereby making it possible to form a precast concrete foundation 100 having a joint 40A with high resistance to lateral shear forces and torsion.

[0044] Furthermore, as shown in Figure 8, the joint 40A has a side view shape in which a narrow region where the convex portions 20 of both the first end face 12 and the second end face 13 face each other and a roughly diamond-shaped wide region where the concave portions 26 of both the first end face 12 and the second end face 13 face each other are arranged in a staggered pattern in the vertical direction, thereby making it possible to form a precast concrete foundation 100 having a joint 40A with high resistance to vertical shear forces.

[0045] In this way, the precast concrete foundation 100 has high shear strength in both the vertical and horizontal directions at the joints 40A of multiple concrete foundation blocks 10 arranged in the extension direction, and is a precast concrete foundation that is not susceptible to localized reduction in shear strength in the area of ​​the filling port of the grout material 30.

[0046] It should be noted that the present invention is not limited to the configurations shown here, and other embodiments may be possible in which other components are combined with the configurations described in the above embodiments. In this regard, the present invention can be modified within the scope of the present invention, and can be appropriately determined depending on the application form. [Explanation of symbols]

[0047] 10: Concrete foundation blocks 11: Bottom edge 12: First end surface (end surface) 13: Second end face (end face) 14: Side 15: Outer frame 16: Hole wall 20: Convex part (frustum pyramidal convex part, shear cotter) 20A: Convex part (frustum pyramidal convex part, shear cotter) 25: Concave (Shear Cotter) 26: Concave (frustum pyramidal concave, shear cotter) 28: Groove 30:Grout material 40,40A:Joint part 50: Footing (on-site construction footing) 100: Precast concrete foundation G: Gap S1: longitudinal shear force S2: Lateral shear force

Claims

1. A precast concrete foundation for supporting a superstructure of a building, the precast concrete foundation being formed by a plurality of precast concrete foundation blocks, wherein a first end face of one adjacent concrete foundation block faces a second end face of the other adjacent concrete foundation block with a gap therebetween, and the gap is filled with grout material; each of the first end surface and the second end surface is provided with a plurality of pyramidal or truncated pyramidal protrusions arranged in vertical and horizontal directions; A precast concrete foundation, characterized in that the convex portions of both the first end surface and the second end surface face each other.

2. A precast concrete foundation for supporting a superstructure of a building, the precast concrete foundation being formed by a plurality of precast concrete foundation blocks, wherein a first end face of one adjacent concrete foundation block faces a second end face of the other adjacent concrete foundation block with a gap therebetween, and the gap is filled with grout material; a plurality of pyramidal or truncated pyramidal convex portions and concave portions arranged alternately in the vertical and horizontal directions on both the first end surface and the second end surface; A precast concrete foundation, characterized in that the convex portions of the first end face and the second end face face each other, and the concave portions of the first end face and the second end face face each other.

3. the pyramidal convex portion is a quadrangular pyramid, 3. The precast concrete foundation according to claim 1, wherein the truncated pyramidal convex portion is a truncated square pyramid.

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