Foundation reinforcement structure, foundation, and foundation reinforcement structure construction method

Abstract

Provided are a foundation reinforcement structure, a foundation, and a construction method for a foundation reinforcement structure that can improve the shear resistance of the foundation. [Solution] The reinforcement structure of the foundation includes a first reinforcement unit (20) and a second reinforcement unit (30) extending parallel to each other with a gap between them. The first stirrups (22) of the first reinforcement unit (20) are located closer to the second reinforcement unit (30) than the first main reinforcements (21) in the second direction (Y). The second stirrups (32) of the second reinforcement unit (30) are located closer to the first reinforcement unit (20) than the second main reinforcements (31) in the second direction (Y). The reinforcement structure of the foundation includes a plurality of reinforcing bars (40) located between the first main reinforcements (21) and the second main reinforcements (31) in a plan view and arranged at intervals in the first direction (X). Each reinforcing bar (40) includes first vertical reinforcements (41) and second vertical reinforcements (42) extending in the up-down direction (Z), and horizontal reinforcements (43) connecting the first vertical reinforcements (41) and the second vertical reinforcements (42).

Description

[Technical Field]

[0001] The present disclosure relates to a reinforcement structure for a foundation, a foundation, and a construction method for a reinforcement structure for a foundation. [Background technology]

[0002] The double reinforcement structure of the reinforced concrete foundation beam described in Patent Document 1 has a pair of left and right beam reinforcement frames extending parallel to each other at a fixed interval. Each beam reinforcement frame has an upper end beam main reinforcement, a lower end beam main reinforcement, and multiple stirrups. The upper end beam main reinforcement and the lower end beam main reinforcement extend parallel to each other at a fixed interval above and below. The multiple stirrups are arranged at a fixed pitch in the axial direction of the upper end beam main reinforcement and the lower end beam main reinforcement. The upper end of each stirrup is welded to the upper end beam main reinforcement. The lower end of each stirrup is welded to the lower end beam main reinforcement. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2017-078254 Summary of the Invention [Problem to be solved by the invention]

[0004] When an earthquake or other disaster occurs, a downward force acts on the foundation from the columns attached to the foundation, and an upward force acts on the foundation from the ground as a reaction force to the downward force. In other words, shear forces act on the foundation in the vertical direction. For this reason, there is a demand for improving the shear resistance of foundations. [Means for solving the problem]

[0005] (1) A reinforcement structure for a foundation that solves the above-mentioned problems includes a first reinforcement unit and a second reinforcement unit extending in parallel with a gap therebetween, and when the direction in which the first reinforcement unit and the second reinforcement unit extend is defined as a first direction and the direction in which the first reinforcement unit and the second reinforcement unit are arranged is defined as a second direction, the first reinforcement unit has a plurality of first main reinforcements extending in the first direction and arranged at intervals in the vertical direction, and a plurality of first stirrups connecting the plurality of first main reinforcements in the vertical direction and arranged at intervals in the first direction, and the second reinforcement unit has a plurality of second main reinforcements extending in the first direction and arranged at intervals in the vertical direction, and a plurality of and a plurality of second stirrups connecting the second main reinforcements in the vertical direction and arranged at intervals in the first direction, wherein the plurality of first stirrups are located closer to the second reinforcement unit than the plurality of first main reinforcements in the second direction, and the plurality of second stirrups are located closer to the first reinforcement unit than the plurality of second main reinforcements in the second direction, and the foundation has a plurality of reinforcing bars located between the first main reinforcements and the second main reinforcements in a plan view and arranged at intervals in the first direction, and the reinforcing bars include first vertical reinforcements and second vertical reinforcements extending in the vertical direction, and horizontal reinforcements connecting the first vertical reinforcements and the second vertical reinforcements.

[0006] With this configuration, the first and second vertical reinforcing bars improve the shear strength of the foundation. In addition, simply inserting a reinforcing bar between the first and second main reinforcing bars improves the shear strength of the foundation, resulting in good workability.

[0007] (2) In the reinforcement structure of the foundation of (1) above, the reinforcing bars are arranged so that the first vertical bars overlap the first stirrups and the second vertical bars overlap the second stirrups when viewed from the first direction.

[0008] With this configuration, the spacing between the first and second reinforcement units is determined by the first and second vertical reinforcements of the reinforcing bars, eliminating the need for a jig to determine the spacing between the first and second reinforcement units.

[0009] (3) In the reinforcement structure of the foundation of (1) or (2) above, the reinforcing bars are arranged so that the first vertical bars are aligned with the first stirrups and the second vertical bars are aligned with the second stirrups.

[0010] With this configuration, the spacing between the first and second reinforcement units is determined by the first and second vertical reinforcements of the reinforcing bars, eliminating the need for a jig to determine the spacing between the first and second reinforcement units. In addition, the work of bundling the first vertical reinforcement and the first stirrup and the work of bundling the second vertical reinforcement and the second stirrup are facilitated.

[0011] (4) In any one of the foundation reinforcement structures (1) to (3) above, the horizontal reinforcement includes a lower horizontal reinforcement connecting the lower end of the first vertical reinforcement with the lower end of the second vertical reinforcement, and an upper horizontal reinforcement connecting the upper end of the first vertical reinforcement with the upper end of the second vertical reinforcement.

[0012] With this configuration, the spacing between the first and second vertical reinforcement bars in the second direction is more likely to be kept constant from the top to the bottom of the reinforcing bars compared to when the horizontal reinforcement consists of only either lower horizontal reinforcement or upper horizontal reinforcement. Therefore, the spacing between the first and second reinforcement units in the second direction is more likely to be kept constant in the up-down direction.

[0013] (5) In the foundation reinforcement structure of (4) above, the lower horizontal reinforcement is located between the first main reinforcement that is located at the lowest among the plurality of first main reinforcements and the second main reinforcement that is located at the lowest among the plurality of second main reinforcements, and the upper horizontal reinforcement is located between the first main reinforcement that is located at the highest among the plurality of first main reinforcements and the second main reinforcement that is located at the highest among the plurality of second main reinforcements.

[0014] With this configuration, the lower horizontal reinforcement is positioned higher than the lowest first and second main reinforcement and the upper horizontal reinforcement is positioned lower than the highest first and second main reinforcement, and the lengths of the first and second vertical reinforcement are longer than when the upper horizontal reinforcement is positioned lower than the highest first and second main reinforcement, thereby further improving the shear strength of the foundation.

[0015] (6) In the foundation reinforcement structure of (4) or (5) above, the reinforcing bar is formed by bending a single steel bar into a hoop shape, and both ends of the steel bar are fixed to each other by welding.

[0016] This configuration provides stronger fastening strength than when both ends of the reinforcing bars are fastened with binding wires, allowing the amount of overlap between the ends of the reinforcing bars to be reduced, thereby shortening the length of the reinforcing bars that make up the reinforcing bars.

[0017] (7) In any one of the foundation reinforcement structures (1) to (3) above, the reinforcing bars are composed of first and second constituent bars, the first constituent bars having first and second vertical constituent bars extending in the vertical direction, and first horizontal bars as the horizontal bars connecting the lower ends of the first vertical constituent bars and the lower ends of the second vertical constituent bars, the second constituent bars having third and fourth vertical constituent bars extending in the vertical direction, and second horizontal bars as the horizontal bars connecting the upper ends of the third vertical constituent bars and the upper ends of the fourth vertical constituent bars, the first vertical reinforcement is composed of the first and third vertical reinforcement overlapping, and the second vertical reinforcement is composed of the second and fourth vertical reinforcement overlapping.

[0018] According to this configuration, the first vertical reinforcement is composed of the first vertical constituent reinforcement and the third vertical constituent reinforcement, and the second vertical reinforcement is composed of the second vertical constituent reinforcement and the fourth vertical constituent reinforcement, thereby further improving the shear strength of the foundation.

[0019] (8) A foundation that solves the above problems includes a reinforcing bar portion having the reinforcement structure of any one of the foundations (1) to (7) above, and a concrete portion. With this configuration, the first and second vertical reinforcing bars improve the shear strength of the foundation. In addition, simply inserting a reinforcing bar between the first and second main reinforcing bars improves the shear strength of the foundation, resulting in good workability.

[0020] (9) A construction method for a foundation reinforcement structure for constructing any one of the foundation reinforcement structures (1) to (7) above includes a first arrangement step of arranging the first reinforcement unit and the second reinforcement unit so that they extend parallel to each other with a gap between them, and a second arrangement step of arranging a plurality of the reinforcing bars between the first main reinforcement and the second main reinforcement.

[0021] This method is easy to construct because the shear strength of the foundation can be improved simply by placing a reinforcing bar between the first and second main bars. In addition, since the reinforcing bars are placed after the first and second reinforcing bar units are placed, it is easy to adjust the number of reinforcing bars, and therefore the shear strength of the foundation. [Effects of the Invention]

[0022] According to the foundation reinforcement structure, foundation, and construction method for the foundation reinforcement structure disclosed herein, the shear strength of the foundation can be improved. [Brief explanation of the drawings]

[0023] [Figure 1] FIG. [Figure 2] 2 is a cross-sectional view of the foundation taken along line 2-2 in FIG. 1. [Figure 3] FIG. 1 is a perspective view showing the reinforcement structure of the foundation. [Figure 4] FIG. 10 is a perspective view showing the first arrangement step of the construction method for the reinforcement structure of the foundation. [Figure 5] FIG. 10 is a perspective view showing a second arrangement step of the construction method for the reinforcement structure of the foundation. [Figure 6] FIG. 10 is a perspective view showing a reinforcement structure of a foundation in a modified example. [Figure 7] FIG. 10 is a perspective view showing a reinforcing bar in a modified example. DETAILED DESCRIPTION OF THE INVENTION

[0024] 1 to 5, the reinforcement structure of the foundation 10, the foundation 10, and a construction method for the reinforcement structure of the foundation 10 according to this embodiment will be described. The reinforcement structure of the foundation 10, the foundation 10, and a construction method for the reinforcement structure of the foundation 10 according to this embodiment are used for low-rise buildings or mid-rise buildings.

[0025] As shown in Figures 1 and 2, the foundation 10 is made of reinforced concrete. The foundation 10 has a steel reinforcement section 11 and a concrete section 12. The reinforcement structure of the foundation 10 of this embodiment is used in parts of the foundation 10 where many structural columns are installed. Examples of parts of the foundation 10 where many structural columns are installed include wet areas such as bathrooms, toilets, and washrooms, as well as stairs.

[0026] <Reinforcement structure of foundation 10> As shown in Figures 2 and 3, the reinforcing bar section 11 includes a first reinforcement unit 20 and a second reinforcement unit 30. The first reinforcement unit 20 and the second reinforcement unit 30 extend parallel to each other with a gap between them. The direction in which the first reinforcement unit 20 and the second reinforcement unit 30 extend is defined as a first direction X. The direction in which the first reinforcement unit 20 and the second reinforcement unit 30 are aligned is defined as a second direction Y.

[0027] The first reinforcement unit 20 has a plurality of first main reinforcements 21 and a plurality of first stirrups 22. The first reinforcement unit 20 of this embodiment has two first main reinforcements 21 as the plurality of first main reinforcements 21. Each first main reinforcement 21 extends in the first direction X. The plurality of first main reinforcements 21 are lined up at intervals in the vertical direction Z. Each first stirrup 22 connects the plurality of first main reinforcements 21 in the vertical direction Z. The plurality of first stirrups 22 are lined up at intervals in the first direction X. The plurality of first stirrups 22 are located closer to the second reinforcement unit 30 than the plurality of first main reinforcements 21 in the second direction Y. The plurality of first main reinforcements 21 and the plurality of first stirrups 22 are fixed to each other by welding.

[0028] The second reinforcement unit 30 has a plurality of second main reinforcements 31 and a plurality of second stirrups 32. The second reinforcement unit 30 of this embodiment has two second main reinforcements 31 as the plurality of second main reinforcements 31. Each second main reinforcement 31 extends in the first direction X. The plurality of second main reinforcements 31 are arranged at intervals in the vertical direction Z. Each second stirrup 32 connects the plurality of second main reinforcements 31 in the vertical direction Z. The plurality of second stirrups 32 are arranged at intervals in the first direction X. The spacing between the second stirrups 32 in the first direction X is the same as the spacing between the first stirrups 22 in the first direction X. The second stirrups 32 are arranged together with the first stirrups 22 in the second direction Y. The second stirrups 32 are located closer to the first reinforcement unit 20 than the second main reinforcements 31 in the second direction Y. The second main reinforcements 31 and the second stirrups 32 are fixed to each other by welding.

[0029] As shown in FIG. 3 , the reinforcing bar portion 11 includes a plurality of reinforcing bars 40. The reinforcing bars 40 are arranged at intervals in the first direction X. Each reinforcing bar 40 is located between a first main reinforcing bar 21 and a second main reinforcing bar 31 in a plan view. In this embodiment, each reinforcing bar 40 is located between two first main reinforcing bars 21 and two second main reinforcing bars 31 in the second direction Y. Each reinforcing bar 40 in this embodiment is hoop-shaped. Each reinforcing bar 40 is formed by bending a single reinforcing bar into a hoop shape. In this embodiment, both ends of the reinforcing bar overlap. The both ends of the reinforcing bar are fixed to each other by welding the overlapping portion.

[0030] Each reinforcing bar 40 has a first vertical bar 41, a second vertical bar 42, and a horizontal bar 43. The first vertical bars 41 and the second vertical bars 42 each extend in the up-down direction Z. The horizontal bars 43 connect the first vertical bars 41 and the second vertical bars 42. The horizontal bars 43 extend in the second direction Y.

[0031] The horizontal reinforcement 43 in this embodiment includes a lower horizontal reinforcement 43a and an upper horizontal reinforcement 43b. The lower horizontal reinforcement 43a connects the lower end of the first vertical reinforcement 41 to the lower end of the second vertical reinforcement 42. The upper horizontal reinforcement 43b connects the upper end of the first vertical reinforcement 41 to the upper end of the second vertical reinforcement 42. In this embodiment, the upper horizontal reinforcement 43b is formed by a portion where both ends of the reinforcing bar overlap.

[0032] As shown in Figures 1 and 3, in this embodiment, the reinforcing bars 40 are arranged so that the first vertical bars 41 overlap the first stirrups 22 and the second vertical bars 42 overlap the second stirrups 32 when viewed from the first direction X.

[0033] In this embodiment, the reinforcing bars 40 are arranged at positions corresponding to the first stirrups 22 and the second stirrups 32 in the first direction X. The reinforcing bars 40 are arranged so that the first vertical reinforcing bars 41 are along the first stirrups 22 and the second vertical reinforcing bars 42 are along the second stirrups 32. The first vertical reinforcing bars 41 and the first stirrups 22 are tied together with a tie wire (not shown). The second vertical reinforcing bars 42 and the second stirrups 32 are tied together with a tie wire (not shown). The positions and number of the tie points are appropriately set so that the first vertical reinforcing bars 41 are tied to the first stirrups 22 and the second vertical reinforcing bars 42 are tied to the second stirrups 32.

[0034] As shown in Figure 2, in this embodiment, the dimension of the reinforcing bar 40 in the vertical direction Z is approximately the same as the dimension of the first reinforcement unit 20 in the vertical direction Z and the dimension of the second reinforcement unit 30 in the vertical direction Z.

[0035] In this embodiment, the lower horizontal reinforcement 43a of the reinforcing bar 40 is located between the lowermost first main reinforcement 21 of the multiple first main reinforcements 21 and the lowermost second main reinforcement 31 of the multiple second main reinforcements 31. Specifically, the lower horizontal reinforcement 43a of the reinforcing bar 40 is located between the lowermost first main reinforcement 21 of the two first main reinforcements 21 and the lowermost second main reinforcement 31 of the two second main reinforcements 31.

[0036] The upper horizontal reinforcement 43b of the reinforcing bar 40 is located between the uppermost first main reinforcement 21 of the multiple first main reinforcements 21 and the uppermost second main reinforcement 31 of the multiple second main reinforcements 31. Specifically, the upper horizontal reinforcement 43b of the reinforcing bar 40 is located between the uppermost first main reinforcement 21 of the two first main reinforcements 21 and the uppermost second main reinforcement 31 of the two second main reinforcements 31.

[0037] <Construction method of reinforcement structure for foundation 10> A construction method for the reinforcement structure of the foundation 10 will be described. The reinforcement structure of the foundation 10 is constructed by workers. The construction method for the reinforcement structure of the foundation 10 includes a first arrangement step and a second arrangement step that is performed after the first arrangement step. The plurality of first main reinforcements 21 and the plurality of first stirrups 22 are unitized in advance as a first reinforcement unit 20 in a factory. The plurality of second main reinforcements 31 and the plurality of second stirrups 32 are unitized in advance as a second reinforcement unit 30 in a factory.

[0038] As shown in Fig. 4, the first arrangement step is a step of arranging the first reinforcement unit 20 and the second reinforcement unit 30 so that they extend in parallel with a gap between them. In the first arrangement step, the first reinforcement unit 20 is arranged so that the multiple first stirrups 22 are located closer to the second reinforcement unit 30 than the multiple first main reinforcements 21 in the second direction Y. The second reinforcement unit 30 is arranged so that the multiple second stirrups 32 are located closer to the first reinforcement unit 20 than the multiple second main reinforcements 31 in the second direction Y. The first reinforcement unit 20 and the second reinforcement unit 30 are supported by a support jig (not shown) to prevent them from falling over.

[0039] As shown in Fig. 5, the second arrangement step is a step of arranging a plurality of reinforcing bars 40. In the second arrangement step, the plurality of reinforcing bars 40 are arranged so as to be spaced apart in the first direction X. Each reinforcing bar 40 is inserted between the first main reinforcing bars 21 and the second main reinforcing bars 31 in a state in which the first vertical reinforcing bars 41 and the second vertical reinforcing bars 42 extend in the up-down direction Z.

[0040] In the second arrangement step of this embodiment, each reinforcing bar 40 is arranged so that the first vertical reinforcing bar 41 overlaps the first stirrup 22 and the second vertical reinforcing bar 42 overlaps the second stirrup 32 when viewed from the first direction X. Each reinforcing bar 40 is arranged so that the first vertical reinforcing bar 41 is along the first stirrup 22 and the second vertical reinforcing bar 42 is along the second stirrup 32.

[0041] [Operation of this embodiment] The operation of this embodiment will be described. The reinforcement structure of the foundation 10 includes a first reinforcement unit 20 and a second reinforcement unit 30 that extend parallel to each other with a gap between them. The first stirrups 22 of the first reinforcement unit 20 are located closer to the second reinforcement unit 30 than the first main reinforcements 21 in the second direction Y. The second stirrups 32 of the second reinforcement unit 30 are located closer to the first reinforcement unit 20 than the second main reinforcements 31 in the second direction Y.

[0042] The reinforcement structure of the foundation 10 includes a plurality of reinforcing bars 40. Each reinforcing bar 40 is located between the first main reinforcing bars 21 and the second main reinforcing bars 31 in a plan view. The multiple reinforcing bars 40 are arranged at intervals in the first direction X. Each reinforcing bar 40 includes a first vertical reinforcing bar 41 and a second vertical reinforcing bar 42 extending in the up-down direction Z, and a horizontal reinforcing bar 43 connecting the first vertical reinforcing bar 41 and the second vertical reinforcing bar 42.

[0043] According to this configuration, the first vertical reinforcement 41 and the second vertical reinforcement 42 of the reinforcing bars 40 improve the shear strength of the foundation 10. The shear strength in this embodiment is the strength against a shear force that divides the foundation 10 in a diagonal direction that intersects the vertical direction Z and the first direction X.

[0044] One possible method for improving the shear strength of the foundation 10 is to increase the height of the foundation 10. However, this would increase the amount of concrete used and the amount of surplus soil to be disposed of.

[0045] Another method for improving the shear strength of the foundation 10 is to provide a ring-shaped reinforcement bar that surrounds the first main reinforcement bar 21 of the first reinforcement unit 20 and the second main reinforcement bar 31 of the second reinforcement unit 30. However, in this case, the first reinforcement unit 20 and the second reinforcement unit 30, which are unitized in advance, must be passed through the ring-shaped reinforcement bar, which makes construction less easy.

[0046] In contrast to this, in this embodiment, the shear strength of the foundation 10 can be improved simply by inserting the reinforcing bars 40 between the first main reinforcement bars 21 and the second main reinforcement bars 31, and therefore workability is good. Furthermore, when placing the reinforcing bars 40, the first vertical bars 41 and second vertical bars 42 of the reinforcing bars 40 can be used to determine the spacing between the first reinforcement unit 20 and the second reinforcement unit 30. Therefore, a jig for determining the spacing between the first reinforcement unit 20 and the second reinforcement unit 30 is not required.

[0047] [Effects of this embodiment] The effects of this embodiment will be described. (1) The first vertical reinforcement 41 and the second vertical reinforcement 42 of the reinforcing bars 40 improve the shear strength of the foundation 10. In addition, the shear strength of the foundation 10 can be improved simply by inserting the reinforcing bars 40 between the first main reinforcement 21 and the second main reinforcement 31, which provides good workability.

[0048] (2) When viewed from the first direction X, the reinforcing bars 40 are arranged such that the first vertical bars 41 overlap the first stirrups 22 and the second vertical bars 42 overlap the second stirrups 32. According to this configuration, the spacing between the first reinforcement unit 20 and the second reinforcement unit 30 is determined by the first vertical reinforcement 41 and the second vertical reinforcement 42 of the reinforcing bar 40. Therefore, a jig for determining the spacing between the first reinforcement unit 20 and the second reinforcement unit 30 is not required.

[0049] (3) The reinforcing bars 40 are arranged so that the first vertical reinforcement 41 is aligned with the first stirrup 22 and the second vertical reinforcement 42 is aligned with the second stirrup 32. This configuration also achieves the effect (2) described above. In addition, the work of bundling the first vertical reinforcement 41 with the first stirrup 22 and the work of bundling the second vertical reinforcement 42 with the second stirrup 32 becomes easier.

[0050] (4) The horizontal bars 43 of the reinforcing bars 40 include a lower horizontal bar 43a connecting the lower end of the first vertical bar 41 to the lower end of the second vertical bar 42, and an upper horizontal bar 43b connecting the upper end of the first vertical bar 41 to the upper end of the second vertical bar 42.

[0051] With this configuration, the spacing between the first vertical reinforcement 41 and the second vertical reinforcement 42 in the second direction Y is more likely to be kept constant from the top to the bottom of the reinforcing bar 40, compared to when the horizontal reinforcement 43 consists of only either the lower horizontal reinforcement 43a or the upper horizontal reinforcement 43b. Therefore, the spacing between the first reinforcement unit 20 and the second reinforcement unit 30 in the second direction Y is more likely to be kept constant in the up-down direction Z.

[0052] (5) The lower horizontal reinforcement 43a is located between the lower of the two first main reinforcements 21 and the lower of the two second main reinforcements 31. The upper horizontal reinforcement 43b is located between the upper of the two first main reinforcements 21 and the upper of the two second main reinforcements 31.

[0053] According to this configuration, the lengths of the first vertical reinforcements 41 and the second vertical reinforcements 42 are longer than when the lower horizontal reinforcements 43a are positioned higher than the first main reinforcements 21 and the second main reinforcements 31 located below, and the upper horizontal reinforcements 43b are positioned lower than the first main reinforcements 21 and the second main reinforcements 31 located above. Therefore, the shear strength of the foundation 10 can be further improved.

[0054] (6) The reinforcing bar 40 is formed by bending a single reinforcing bar into a hoop shape. Both ends of the reinforcing bar are fixed to each other by welding. This configuration provides stronger fastening strength than when both ends of the reinforcing bars are fastened with binding wires, allowing the amount of overlap between the ends of the reinforcing bars to be reduced, thereby shortening the length of the reinforcing bars that make up the reinforcing bars 40.

[0055] (7) The construction method of the reinforcement structure of the foundation 10 includes a first placement process of placing the first reinforcement unit 20 and the second reinforcement unit 30 so that they extend parallel to each other with a gap between them, and a second placement process of placing multiple reinforcing bars 40 between the first main reinforcement 21 and the second main reinforcement 31.

[0056] According to this method, the shear strength of the foundation 10 can be improved simply by placing the reinforcing bars 40 between the first main bars 21 and the second main bars 31, and therefore workability is good. Furthermore, since the reinforcing bars 40 are placed after the first reinforcing bar units 20 and the second reinforcing bar units 30 are placed, it is easy to adjust the number of reinforcing bars 40. Therefore, the shear strength of the foundation 10 is easy to adjust.

[0057] (8) In portions of the foundation 10 where many structural columns are installed, the shear force acting on the foundation 10 is greater than in other portions. For this reason, the portions of the foundation 10 where many structural columns are installed require a higher shear resistance than the other portions. Therefore, in the past, the necessary shear resistance was ensured by increasing the height of the foundation 10 in portions of the foundation 10 where many structural columns are installed. In contrast, in this embodiment, a reinforcement structure for the foundation 10 with excellent shear resistance is used in portions of the foundation 10 where many structural columns are installed, so the necessary shear resistance can be ensured without increasing the height of the foundation 10.

[0058] <Example of change> The above-described embodiments are examples of possible forms of the reinforcement structure of the foundation 10, the foundation 10, and the construction method of the reinforcement structure of the foundation 10, and are not intended to limit the forms. The reinforcement structure of the foundation 10, the foundation 10, and the construction method of the reinforcement structure of the foundation 10 may take forms different from those exemplified in the above-described embodiments. Examples of such forms include forms in which part of the configuration of the embodiments is replaced, modified, or omitted, or forms in which a new configuration is added to the embodiments. Modified examples of the embodiments are shown below.

[0059] The number of first main reinforcements 21 is not limited to two. The number of first main reinforcements 21 may be three or more. The number of second main reinforcements 31 is not limited to two. The number of second main reinforcements 31 may be three or more. The first vertical reinforcement 41 of the reinforcing bar 40 may not overlap the first stirrup 22 when viewed from the first direction X. The second vertical reinforcement 42 of the reinforcing bar 40 may not overlap the second stirrup 32 when viewed from the first direction X. Even in this case, at least the effect (1) of the above embodiment can be obtained.

[0060] The first vertical reinforcement 41 of the reinforcement 40 does not have to be arranged along the first stirrups 22. The second vertical reinforcement 42 of the reinforcement 40 does not have to be arranged along the second stirrups 32. For example, the reinforcement 40 may be tied to each first main reinforcement 21 and each second main reinforcement 31. Even in this case, at least the effect (1) of the above embodiment can be obtained.

[0061] The lower horizontal reinforcement 43a of the reinforcement 40 does not have to be located between the lowest first main reinforcement 21 of the multiple first main reinforcements 21 and the lowest second main reinforcement 31 of the multiple second main reinforcements 31. Similarly, the upper horizontal reinforcement 43b of the reinforcement 40 does not have to be located between the highest first main reinforcement 21 of the multiple first main reinforcements 21 and the highest second main reinforcement 31 of the multiple second main reinforcements 31. The heights of the lower horizontal reinforcement 43a and the upper horizontal reinforcement 43b in the vertical direction Z may be changed as appropriate. Even in this case, at least the effect (1) of the above embodiment can be obtained.

[0062] In the above embodiment, the ends of the reinforcing bars constituting the reinforcing bars 40 are fixed to each other by welding, but they may also be fixed to each other by binding with binding wires. In the above embodiment, the reinforcing bar 40 is made up of one reinforcing bar, but it may be made up of a plurality of reinforcing bars.

[0063] As shown in Figures 6 and 7, the reinforcing bars 40 may be composed of first constituent bars 40a and second constituent bars 40b. In the example shown in Figures 6 and 7, the first constituent bars 40a and the second constituent bars 40b are each composed of a single bent reinforcing bar.

[0064] The first constituent reinforcement 40a has a first vertical constituent reinforcement 41a and a second vertical constituent reinforcement 42a extending in the vertical direction Z, and a first horizontal reinforcement 43c as a horizontal reinforcement 43 connecting the lower end of the first vertical constituent reinforcement 41a and the lower end of the second vertical constituent reinforcement 42a.

[0065] The second constituent reinforcement 40b has a third vertical constituent reinforcement 41b and a fourth vertical constituent reinforcement 42b extending in the vertical direction Z, and a second horizontal reinforcement 43d as a horizontal reinforcement 43 connecting the upper end of the third vertical constituent reinforcement 41b and the upper end of the fourth vertical constituent reinforcement 42b.

[0066] The first vertical reinforcement 41 is formed by overlapping the first vertical reinforcement 41a and the third vertical reinforcement 41b. In the example shown in Figures 6 and 7, the entire first vertical reinforcement 41a and the entire third vertical reinforcement 41b overlap. The second vertical reinforcement 42 is formed by overlapping the second vertical reinforcement 42a and the fourth vertical reinforcement 42b. In the example shown in Figures 6 and 7, the entire second vertical reinforcement 42a and the entire fourth vertical reinforcement 42b overlap. The first reinforcement 40a and the second reinforcement 40b are hoop-shaped.

[0067] In the example shown in Fig. 6, the reinforcing bars 40 are arranged so that the first vertical reinforcement 41 is aligned with the first stirrup 22 and the second vertical reinforcement 42 is aligned with the second stirrup 32. More specifically, the first vertical reinforcement 40a is arranged so that the first vertical reinforcement 41a is aligned with the first stirrup 22 and the second vertical reinforcement 42a is aligned with the second stirrup 32. The second vertical reinforcement 40b is arranged so that the third vertical reinforcement 41b is aligned with the first vertical reinforcement 41a and the fourth vertical reinforcement 42b is aligned with the second vertical reinforcement 42a. The first stirrup 22, the first vertical reinforcement 41a, and the third vertical reinforcement 41b are tied together with binding wires (not shown). The second stirrup 32, the second vertical reinforcement 42a, and the fourth vertical reinforcement 42b are tied together with binding wires (not shown).

[0068] The overlap amount between the first vertical reinforcement 41a and the third vertical reinforcement 41b may be changed as appropriate. Similarly, the overlap amount between the second vertical reinforcement 42a and the fourth vertical reinforcement 42b may be changed as appropriate.

[0069] The second constituent reinforcement 40b may be arranged such that the third vertical constituent reinforcement 41b is along the first stirrup 22 and the fourth vertical constituent reinforcement 42b is along the second stirrup 32. The first constituent reinforcement 40a may be arranged such that the first vertical constituent reinforcement 41a is along the third vertical constituent reinforcement 41b and the second vertical constituent reinforcement 42a is along the fourth vertical constituent reinforcement 42b.

[0070] The first constituent reinforcement 40a and the second constituent reinforcement 40b may be connected to each other before being placed between the first main reinforcement 21 and the second main reinforcement 31, or may be connected to each other after being placed between the first main reinforcement 21 and the second main reinforcement 31.

[0071] The number of horizontal bars 43 of the reinforcing bars 40 may be three or more. The position of the horizontal reinforcement 43 in the up-down direction Z relative to the first vertical reinforcement 41 and the second vertical reinforcement 42 may be changed as appropriate.

[0072] The dimensions of the reinforcing bars 40 in the vertical direction Z may be different from the dimensions of the first reinforcement unit 20 in the vertical direction Z and the dimensions of the second reinforcement unit 30 in the vertical direction Z.

[0073] <Additional Notes> This specification discloses the following techniques: [Appendix 1] The reinforcement structure comprises a first reinforcement unit and a second reinforcement unit extending in parallel at intervals, and when the direction in which the first reinforcement unit and the second reinforcement unit extend is defined as a first direction and the direction in which the first reinforcement unit and the second reinforcement unit are lined up is defined as a second direction, the first reinforcement unit has a plurality of first main reinforcements extending in the first direction and lined up at intervals in the vertical direction, and a plurality of first stirrups connecting the plurality of first main reinforcements in the vertical direction and lined up at intervals in the first direction, and the second reinforcement unit has a plurality of second main reinforcements extending in the first direction and lined up at intervals in the vertical direction, and a plurality of first stirrups connecting the plurality of second main reinforcements in the vertical direction. and a plurality of second stirrups connected to the first main reinforcements and arranged at intervals in the first direction, wherein the plurality of first stirrups are located closer to the second reinforcement unit than the plurality of first main reinforcements in the second direction, and the plurality of second stirrups are located closer to the first reinforcement unit than the plurality of second main reinforcements in the second direction, and the foundation reinforcement structure comprises a plurality of reinforcing bars located between the first main reinforcements and the second main reinforcements in a plan view and arranged at intervals in the first direction, the reinforcing bars having first vertical reinforcements and second vertical reinforcements extending in the up-down direction, and transverse reinforcements connecting the first vertical reinforcements and the second vertical reinforcements.

[0074] [Appendix 2] In the reinforcement structure of the foundation described in Appendix 1, the reinforcing bars are arranged so that the first vertical bars overlap the first stirrups and the second vertical bars overlap the second stirrups when viewed from the first direction.

[0075] [Appendix 3] In the reinforcement structure of the foundation described in Appendix 1, the reinforcing bars are arranged so that the first vertical bars are aligned with the first stirrups and the second vertical bars are aligned with the second stirrups.

[0076] [Appendix 4] In the foundation reinforcement structure described in Appendix 1, the horizontal reinforcement includes a lower horizontal reinforcement that connects the lower end of the first vertical reinforcement with the lower end of the second vertical reinforcement, and an upper horizontal reinforcement that connects the upper end of the first vertical reinforcement with the upper end of the second vertical reinforcement.

[0077] [Appendix 5] In the reinforcement structure described in Appendix 4, the lower cross reinforcement is located between the first main reinforcement located at the lowest position among the plurality of first main reinforcements and the second main reinforcement located at the lowest position among the plurality of second main reinforcements, and the upper cross reinforcement is located between the first main reinforcement located at the highest position among the plurality of first main reinforcements and the second main reinforcement located at the highest position among the plurality of second main reinforcements.

[0078] [Appendix 6] In the reinforcement structure of the foundation described in Appendix 4, the reinforcing bar is formed by bending a single reinforcing bar into a hoop shape, and both ends of the reinforcing bar are fixed to each other by welding.

[0079] [Appendix 7] In the reinforcement structure of the foundation described in Appendix 1, the reinforcing bars are composed of first and second constituent bars, the first constituent bars having first and second vertical constituent bars extending in the vertical direction, and a first horizontal bar as the horizontal bar connecting the lower end of the first vertical constituent bar with the lower end of the second vertical constituent bar, the second constituent bars having third and fourth vertical constituent bars extending in the vertical direction, and a second horizontal bar as the horizontal bar connecting the upper end of the third vertical constituent bar with the upper end of the fourth vertical constituent bar, the first vertical reinforcement is composed of the first and third vertical reinforcement overlapping, and the second vertical reinforcement is composed of the third and fourth vertical reinforcement overlapping.

[0080] [Appendix 8] A foundation comprising a reinforcing bar portion having the reinforcement structure of the foundation according to any one of Supplementary Notes 1 to 7, and a concrete portion.

[0081] [Appendix 9] A construction method for a foundation reinforcement structure for constructing the foundation reinforcement structure described in any one of Appendices 1 to 7, the construction method for a foundation reinforcement structure including: a first arrangement step of arranging the first reinforcement unit and the second reinforcement unit so that they extend parallel to each other with a gap between them; and a second arrangement step of arranging a plurality of the reinforcing bars between the first main reinforcement and the second main reinforcement. [Explanation of symbols]

[0082] 10...foundation, 11...reinforcement section, 12...concrete section, 20...first reinforcement unit, 21...first main reinforcement, 22...first stirrup, 30...second reinforcement unit, 31...second main reinforcement, 32...second stirrup, 40...reinforcing bar, 40a...first constituent reinforcement, 40b...second constituent reinforcement, 41...first vertical reinforcement, 41a...first vertical reinforcement, 41b...third vertical reinforcement, 42...second vertical reinforcement, 42a...second vertical reinforcement, 42b...fourth vertical reinforcement, 43...horizontal reinforcement, 43a...lower horizontal reinforcement, 43b...upper horizontal reinforcement, 43c...first horizontal reinforcement, 43d...second horizontal reinforcement, X...first direction, Y...second direction, Z...vertical direction.

Claims

1. The reinforcement structure includes a first reinforcement unit and a second reinforcement unit extending parallel to each other with a gap therebetween, a direction in which the first reinforcement unit and the second reinforcement unit extend is defined as a first direction; When the direction in which the first reinforcement unit and the second reinforcement unit are arranged is defined as a second direction, the first reinforcement unit includes a plurality of first main reinforcements extending in the first direction and arranged at intervals in the up-down direction, and a plurality of first stirrups connecting the plurality of first main reinforcements in the up-down direction and arranged at intervals in the first direction, the second reinforcement unit is a reinforcement structure for a foundation including a plurality of second main reinforcements extending in the first direction and arranged at intervals in the up-down direction, and a plurality of second stirrups connecting the plurality of second main reinforcements in the up-down direction and arranged at intervals in the first direction, the plurality of first stirrups are located closer to the second reinforcement unit than the plurality of first main reinforcements in the second direction, the second stirrups are located closer to the first reinforcement unit than the second main reinforcements in the second direction, A plurality of reinforcing bars are provided which are located between the first main reinforcement and the second main reinforcement in a plan view and are arranged at intervals in the first direction, The reinforcement structure of the foundation includes first and second vertical reinforcements extending in the vertical direction, and horizontal reinforcements connecting the first and second vertical reinforcements.

2. The reinforcement structure of a foundation according to claim 1, wherein the reinforcing bars are arranged such that the first vertical bars overlap the first stirrups and the second vertical bars overlap the second stirrups when viewed from the first direction.

3. The reinforcement structure of a foundation according to claim 1, wherein the reinforcing bars are arranged such that the first vertical bars are aligned along the first stirrups and the second vertical bars are aligned along the second stirrups.

4. The horizontal reinforcement is A lower horizontal reinforcement connecting the lower end of the first vertical reinforcement and the lower end of the second vertical reinforcement; An upper horizontal reinforcement connecting the upper end of the first vertical reinforcement and the upper end of the second vertical reinforcement; The reinforcement structure for a foundation according to claim 1, comprising:

5. The lower transverse reinforcement is located between the first main reinforcement located at the lowest position among the plurality of first main reinforcements and the second main reinforcement located at the lowest position among the plurality of second main reinforcements, 5. The reinforcement structure of a foundation according to claim 4, wherein the upper horizontal reinforcement is located between the first main reinforcement located at the uppermost position among the plurality of first main reinforcements and the second main reinforcement located at the uppermost position among the plurality of second main reinforcements.

6. The reinforcing bar is formed by bending a single reinforcing bar into a hoop shape, 5. The reinforcement structure for a foundation according to claim 4, wherein both ends of the reinforcing bar are fixed to each other by welding.

7. The reinforcing bar is composed of a first component bar and a second component bar, The first constituent reinforcement has a first vertical constituent reinforcement and a second vertical constituent reinforcement extending in the vertical direction, and a first horizontal reinforcement as the horizontal reinforcement connecting the lower end of the first vertical constituent reinforcement and the lower end of the second vertical constituent reinforcement, The second constituent reinforcement has a third vertical constituent reinforcement and a fourth vertical constituent reinforcement extending in the vertical direction, and a second horizontal reinforcement as the horizontal reinforcement connecting the upper end of the third vertical constituent reinforcement and the upper end of the fourth vertical constituent reinforcement, The first vertical reinforcement is formed by overlapping the first vertical reinforcement and the third vertical reinforcement, The reinforcement structure of a foundation according to claim 1, wherein the second vertical reinforcement is formed by overlapping the third vertical reinforcement and the fourth vertical reinforcement.

8. A foundation comprising a reinforcing bar section having the foundation reinforcement structure according to any one of claims 1 to 7, and a concrete section.

9. A construction method for a reinforcement structure of a foundation for constructing the reinforcement structure of a foundation according to any one of claims 1 to 7, a first arrangement step of arranging the first reinforcement unit and the second reinforcement unit so that they extend in parallel with each other at an interval; a second arranging step of arranging a plurality of the reinforcing bars between the first main reinforcement and the second main reinforcement; Construction method for reinforcement structure of foundation including.

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