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

Abstract

The present invention provides a reinforcement structure for a foundation, a foundation, and a construction method for the reinforcement structure for a foundation that can improve the shear strength of the foundation. [Solution] The reinforcement structure of the foundation comprises a first reinforcement unit 20 and a second reinforcement unit 30 that extend parallel to each other at intervals. Multiple first stirrups 22 of the first reinforcement unit 20 are located on the second reinforcement unit 30 side of multiple first main reinforcements 21 in the second direction Y. Multiple second stirrups 32 of the second reinforcement unit 30 are located on the first reinforcement unit 20 side of multiple second main reinforcements 31 in the second direction Y. The reinforcement structure of the foundation comprises multiple 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 has a first longitudinal bar 41 and a second longitudinal bar 42 extending in the vertical direction Z, and a transverse bar 43 connecting the first longitudinal bar 41 and the second longitudinal bar 42.

Description

Technical Field

[0001] The present disclosure relates to a reinforcement structure of a foundation, a foundation, and a construction method of the reinforcement structure of the foundation.

Background Art

[0002] The double reinforcement structure of the reinforced concrete foundation beam described in Patent Document 1 includes a pair of left and right beam reinforcement frames extending in parallel at a certain interval. Each beam reinforcement frame has an upper beam main reinforcement, a lower beam main reinforcement, and a plurality of stirrups. The upper beam main reinforcement and the lower beam main reinforcement extend in parallel with a predetermined interval therebetween in the vertical direction. The plurality of stirrups are arranged at a predetermined pitch in the axial direction of the upper beam main reinforcement and the lower beam main reinforcement. The upper end portion of each stirrup is welded to the upper beam main reinforcement. The lower end portion of each stirrup is welded to the lower beam main reinforcement.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] When an earthquake or the like occurs, a downward force acts on the foundation from the column provided on the foundation, and as a reaction force of the force, an upward force acts on the foundation from the ground. That is, a shear force acts on the foundation in the vertical direction. Therefore, an improvement in the shear strength of the foundation is required.

Means for Solving the Problems

[0005] (1) The reinforcement structure of the foundation that solves the above problem comprises a first reinforcement unit and a second reinforcement unit extending parallel to each other at intervals, wherein the direction in which the first reinforcement unit and the second reinforcement unit extend is defined as the first direction, and the direction in which the first reinforcement unit and the second reinforcement unit are aligned is defined as the second direction, wherein 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, wherein 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 A reinforcement structure for a foundation having a plurality of second stirrups that connect the aforementioned second main reinforcement bars in the vertical direction and are spaced apart in the first direction, wherein the plurality of first stirrups are located on the second reinforcement unit side of the plurality of first main reinforcement bars in the second direction, and the plurality of second stirrups are located on the first reinforcement unit side of the plurality of second main reinforcement bars in the second direction, and are located between the first main reinforcement bars and the second main reinforcement bars in a plan view and are spaced apart in the first direction, the reinforcing bars having first longitudinal bars and second longitudinal bars extending in the vertical direction, and transverse bars connecting the first longitudinal bars and the second longitudinal bars.

[0006] This configuration improves the shear strength of the foundation through the first and second longitudinal reinforcing bars. Furthermore, since the shear strength of the foundation can be improved simply by inserting reinforcing bars between the first and second main reinforcing bars, the constructability is excellent.

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

[0008] In this configuration, the spacing between the first and second reinforcement units is determined by the first and second longitudinal reinforcing bars. Therefore, a jig is not required to determine the spacing between the first and second reinforcement units.

[0009] (3) In the reinforcement structure of the foundation described in (1) or (2) above, the reinforcing bars are arranged such that the first longitudinal bars are along the first stirrups and the second longitudinal bars are along the second stirrups.

[0010] In this configuration, the spacing between the first and second reinforcement units is determined by the first and second longitudinal reinforcing bars. Therefore, a jig is not required to determine the spacing between the first and second reinforcement units. Furthermore, the tying work between the first longitudinal reinforcement and the first stirrup, and between the second longitudinal reinforcement and the second stirrup, becomes easier.

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

[0012] With this configuration, compared to the case where there are only either lower or upper transverse bars, the spacing between the first and second longitudinal bars in the second direction, from the upper end to the lower end of the reinforcing bars, is more easily maintained. Therefore, the spacing between the first and second reinforcement units in the second direction is more easily maintained in the vertical direction.

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

[0014] In this configuration, the length of the first and second vertical reinforcement bars is longer compared to the case where the lower horizontal reinforcement bars are located higher than the first and second main reinforcement bars which are located at the lowest position, and the upper horizontal reinforcement bars are located lower than the first and second main reinforcement bars which are located at the highest position. Therefore, the shear strength of the foundation can be further improved.

[0015] (6) In the reinforcement structure of the foundation described in (4) or (5) above, the reinforcing bars are 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.

[0016] With this configuration, the fixing strength is higher compared to when both ends of the reinforcing bars are fixed by binding with binding wire, so the amount of overlap at both ends of the reinforcing bars can be reduced. Therefore, the length of the reinforcing bars that make up the reinforcement can be shortened.

[0017] (7) In any one of the foundation reinforcement structures described in (1) to (3) above, the reinforcing bars are composed of a first and a second reinforcement, the first reinforcement having a first and second longitudinal reinforcement extending vertically and a first transverse reinforcement as the transverse reinforcement connecting the lower end of the first longitudinal reinforcement and the lower end of the second longitudinal reinforcement, the second reinforcement having a third and a fourth longitudinal reinforcement extending vertically and a second transverse reinforcement as the transverse reinforcement connecting the upper end of the third longitudinal reinforcement and the upper end of the fourth longitudinal reinforcement, the first longitudinal reinforcement being composed of the first and third longitudinal reinforcement overlapping, and the second longitudinal reinforcement being composed of the second and fourth longitudinal reinforcement overlapping.

[0018] With this configuration, the first longitudinal reinforcement is composed of the first and third longitudinal reinforcement bars, and the second longitudinal reinforcement is composed of the second and fourth longitudinal reinforcement bars, thereby further improving the shear strength of the foundation.

[0019] (8) The foundation for solving the above problems comprises a reinforced concrete section having the reinforcement structure of any one of the foundations described in (1) to (7) above, and a concrete section. This configuration improves the shear strength of the foundation through the first and second longitudinal reinforcing bars. Furthermore, since the shear strength of the foundation can be improved simply by inserting reinforcing bars between the first and second main reinforcing bars, the constructability is excellent.

[0020] (9) The construction method of the foundation reinforcement structure for constructing any one of the foundation reinforcement structures of (1) to (7) above includes a first arranging step of arranging the first reinforcement unit and the second reinforcement unit so as to extend in parallel with an interval therebetween, and a second arranging step of arranging a plurality of the reinforcing bars between the first main bars and the second main bars.

[0021] According to this method, the shear resistance of the foundation can be improved only by arranging the reinforcing bars between the first main bar and the second main bar, so the workability is good. Also, since the reinforcing bars are arranged after the first reinforcement unit and the second reinforcement unit are arranged, it is easy to adjust the number of the reinforcing bars. Therefore, it is easy to adjust the shear resistance of the foundation.

Effect of the Invention

[0022] According to the foundation reinforcement structure, the foundation, and the construction method of the foundation reinforcement structure of the present disclosure, the shear resistance of the foundation can be improved.

Brief Description of the Drawings

[0023] [Figure 1] It is a front view of the foundation. [Figure 2] It is a cross-sectional view of the foundation along the line 2-2 in FIG. 1. [Figure 3] It is a perspective view showing the foundation reinforcement structure. [Figure 4] It is a perspective view showing the first arranging step of the construction method of the foundation reinforcement structure. [Figure 5] It is a perspective view showing the second arranging step of the construction method of the foundation reinforcement structure. [Figure 6] It is a perspective view showing the foundation reinforcement structure in a modification example. [Figure 7] It is a perspective view showing the reinforcing bars in a modification example.

Mode for Carrying Out the Invention

[0024] Referring to Figures 1 to 5, the reinforcement structure of the foundation 10, the foundation 10, and the construction method of the reinforcement structure of the foundation 10 in this embodiment will be described. The reinforcement structure of the foundation 10, the foundation 10, and the construction method of the reinforcement structure of the foundation 10 in this embodiment are used for low-rise 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 reinforced concrete section 11 and a concrete section 12. The reinforcement structure of the foundation 10 in this embodiment is used in parts of the foundation 10 where many structural columns are provided. Parts of the foundation 10 where many structural columns are provided include, for example, bathrooms, toilets, washrooms and other wet areas, and stairs.

[0026] <Reinforcement structure of foundation 10> As shown in Figures 2 and 3, the reinforced concrete section 11 comprises 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 called the first direction X. The direction in which the first reinforcement unit 20 and the second reinforcement unit 30 are aligned is called the second direction Y.

[0027] The first reinforcement unit 20 has a plurality of first main reinforcements 21 and a plurality of first stirrups 22. In this embodiment, the first reinforcement unit 20 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 spaced apart 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 spaced apart 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. In this embodiment, the second reinforcement unit 30 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 spaced apart 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 spaced apart in the first direction X. The spacing of the second stirrups 32 in the first direction X is the same as the spacing of the first stirrups 22 in the first direction X. The second stirrups 32 are aligned with the first stirrups 22 in the second direction Y. The multiple second stirrups 32 are located on the first reinforcement unit 20 side in the second direction Y compared to the multiple second main reinforcements 31. The multiple second main reinforcements 31 and the multiple second stirrups 32 are fixed to each other by welding.

[0029] As shown in Figure 3, the reinforced concrete section 11 is provided with a plurality of reinforcing bars 40. The plurality of reinforcing bars 40 are arranged at intervals in the first direction X. In a plan view, each reinforcing bar 40 is located between the first main reinforcement bars 21 and the second main reinforcement bars 31. In this embodiment, each reinforcing bar 40 is located between the two first main reinforcement bars 21 and the two second main reinforcement 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 ends of the reinforcing bar are fixed to each other by welding the overlapping portions.

[0030] Each reinforcing bar 40 has a first longitudinal bar 41, a second longitudinal bar 42, and a transverse bar 43. The first longitudinal bar 41 and the second longitudinal bar 42 each extend in the vertical direction Z. The transverse bar 43 connects the first longitudinal bar 41 and the second longitudinal bar 42. The transverse bar 43 extends 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 and the lower end of the second vertical reinforcement 42. The upper horizontal reinforcement 43b connects the upper end of the first vertical reinforcement 41 and the upper end of the second vertical reinforcement 42. In this embodiment, the upper horizontal reinforcement 43b is composed of overlapping portions of both ends of the reinforcement bar.

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

[0033] In this embodiment, the reinforcing bars 40 are positioned in a first direction X corresponding to the first stirrups 22 and the second stirrups 32. The reinforcing bars 40 are positioned such that the first longitudinal bar 41 follows the first stirrups 22 and the second longitudinal bar 42 follows the second stirrups 32. The first longitudinal bar 41 and the first stirrups 22 are bound together by binding wire (not shown). The second longitudinal bar 42 and the second stirrups 32 are bound together by binding wire (not shown). The positions and number of binding points are set appropriately so that the first longitudinal bar 41 is bound to the first stirrups 22 and the second longitudinal bar 42 is bound to the second stirrups 32.

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

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

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

[0037] <Construction method for the reinforcement structure of foundation 10> The 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 placement process and a second placement process performed after the first placement process. Multiple first main reinforcements 21 and multiple first stirrups 22 are pre-unitized as a first reinforcement unit 20 in the factory. Multiple second main reinforcements 31 and multiple second stirrups 32 are pre-unitized as a second reinforcement unit 30 in the factory.

[0038] As shown in Figure 4, the first placement step is to place the first reinforcement unit 20 and the second reinforcement unit 30 so that they are spaced apart and extending parallel to each other. In the first placement step, the first reinforcement unit 20 is positioned such that, in the second direction Y, multiple first stirrups 22 are located closer to the second reinforcement unit 30 than multiple first main reinforcements 21. The second reinforcement unit 30 is positioned such that, in the second direction Y, multiple second stirrups 32 are located closer to the first reinforcement unit 20 than multiple second main reinforcements 31. The first reinforcement unit 20 and the second reinforcement unit 30 are supported by support jigs (not shown) to prevent them from falling over.

[0039] As shown in Figure 5, the second placement step is the step of placing multiple reinforcing bars 40. In the second placement step, the multiple reinforcing bars 40 are placed so as to be spaced apart in the first direction X. Each reinforcing bar 40 is inserted between the first main bar 21 and the second main bar 31, with the first longitudinal bar 41 and the second longitudinal bar 42 extending in the vertical direction Z.

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

[0041] [Operation of this embodiment] The operation of this embodiment will now be explained. The reinforcement structure of the foundation 10 comprises a first reinforcement unit 20 and a second reinforcement unit 30 that extend parallel to each other at intervals. The multiple first stirrups 22 of the first reinforcement unit 20 are located on the second reinforcement unit 30 side of the multiple first main reinforcements 21 in the second direction Y. The multiple second stirrups 32 of the second reinforcement unit 30 are located on the first reinforcement unit 20 side of the multiple second main reinforcements 31 in the second direction Y.

[0042] The reinforcement structure of the foundation 10 includes multiple reinforcing bars 40. Each reinforcing bar 40 is located between the first main reinforcement 21 and the second main reinforcement 31 in a plan view. The multiple reinforcing bars 40 are spaced apart in the first direction X. Each reinforcing bar 40 has a first longitudinal reinforcement 41 and a second longitudinal reinforcement 42 extending in the vertical direction Z, and a transverse reinforcement 43 connecting the first longitudinal reinforcement 41 and the second longitudinal reinforcement 42.

[0043] In this configuration, the first longitudinal reinforcement bars 41 and the second longitudinal reinforcement bars 42 of the reinforcing bars 40 improve the shear strength of the foundation 10. The shear strength in this embodiment is the strength against shear forces that divide the foundation 10 in diagonal directions intersecting the vertical direction Z and the first direction X.

[0044] One way to improve the shear strength of the foundation 10 is to increase its height. However, this would increase the amount of concrete used and the amount of excavated soil to be disposed of.

[0045] Another method to improve the shear strength of the foundation 10 is to provide ring-shaped reinforcing bars surrounding the first main reinforcement bars 21 of the first reinforcement unit 20 and the second main reinforcement bars 31 of the second reinforcement unit 30. However, in this case, the pre-assembled first reinforcement unit 20 and second reinforcement unit 30 must be passed through the ring-shaped reinforcing bars, which results in poor workability.

[0046] In contrast, in this embodiment, the shear strength of the foundation 10 can be improved simply by inserting the reinforcing bar 40 between the first main reinforcement 21 and the second main reinforcement 31, thus offering good constructability. Furthermore, when arranging the reinforcing bars 40, the spacing between the first reinforcement unit 20 and the second reinforcement unit 30 can be determined using the first and second longitudinal bars 41 and 42 of the reinforcing bars 40. Therefore, a jig for determining the spacing between the first reinforcement unit 20 and the second reinforcement unit 30 becomes unnecessary.

[0047] [Effects of this embodiment] The effects of this embodiment will now be explained. (1) The first longitudinal reinforcement bars 41 and the second longitudinal reinforcement bars 42 of the reinforcing bars 40 improve the shear strength of the foundation 10. Furthermore, 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, resulting in good workability.

[0048] (2) The reinforcing bars 40 are arranged such that, when viewed from the first direction X, the first longitudinal bars 41 overlap with the first rib bars 22 and the second longitudinal bars 42 overlap with the second rib bars 32. In this configuration, the spacing between the first reinforcement unit 20 and the second reinforcement unit 30 is determined by the first and second longitudinal reinforcements 41 and 42 of the reinforcing bars 40. Therefore, a jig is not required to determine the spacing between the first reinforcement unit 20 and the second reinforcement unit 30.

[0049] (3) The reinforcing bars 40 are arranged such that the first longitudinal bar 41 follows the first stirrup 22 and the second longitudinal bar 42 follows the second stirrup 32. This configuration also provides the above-mentioned effect (2). Furthermore, the tying work between the first longitudinal bar 41 and the first stirrup 22 and the tying work between the second longitudinal bar 42 and the second stirrup 32 becomes easier.

[0050] (4) The transverse bars 43 of the reinforcing bars 40 include a lower transverse bar 43a that connects the lower end of the first longitudinal bar 41 and the lower end of the second longitudinal bar 42, and an upper transverse bar 43b that connects the upper end of the first longitudinal bar 41 and the upper end of the second longitudinal bar 42.

[0051] With this configuration, compared to the case where the horizontal reinforcement 43 consists of only one of the lower horizontal reinforcement 43a and the upper horizontal reinforcement 43b, the spacing between the first vertical reinforcement 41 and the second vertical reinforcement 42 in the second direction Y from the upper end to the lower end of the reinforcing bar 40 is more easily maintained. Therefore, the spacing between the first reinforcement unit 20 and the second reinforcement unit 30 in the second direction Y is more easily maintained in the vertical direction Z.

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

[0053] In this configuration, the length of the first vertical reinforcement 41 and the second vertical reinforcement 42 is longer compared to the case where the lower horizontal reinforcement 43a is located higher than the first main reinforcement 21 and the second main reinforcement 31 located lower, and the upper horizontal reinforcement 43b is located lower than the first main reinforcement 21 and the second main reinforcement 31 located upper. Therefore, the shear strength of the foundation 10 can be further improved.

[0054] (6) The reinforcing bars 40 are formed by bending a single reinforcing bar into a hoop shape. The ends of the reinforcing bars are fixed to each other by welding. With this configuration, the fixing strength is higher compared to when both ends of the reinforcing bar are fixed by binding with binding wire, so the amount of overlap at both ends of the reinforcing bar can be reduced. Therefore, the length of the reinforcing bars that make up the reinforcing bar 40 can be shortened.

[0055] (7) The construction method for the reinforcement structure of the foundation 10 includes a first placement step of arranging the first reinforcement unit 20 and the second reinforcement unit 30 so as to be spaced apart and extending parallel to each other, and a second placement step of arranging a plurality of reinforcing bars 40 between the first main reinforcement 21 and the second main reinforcement 31.

[0056] This method allows for improved shear strength of the foundation 10 simply by placing reinforcing bars 40 between the first main reinforcement bars 21 and the second main reinforcement bars 31, thus resulting in good workability. Furthermore, since the reinforcing bars 40 are placed after the first reinforcement unit 20 and the second reinforcement unit 30 are in place, it is easy to adjust the number of reinforcing bars 40. Therefore, it is easy to adjust the shear strength of the foundation 10.

[0057] (8) In areas of the foundation 10 where many structural columns are provided, the shear force acting on the foundation 10 is greater than in other areas. Therefore, in areas of the foundation 10 where many structural columns are provided, a higher shear strength is required than in other areas. Conventionally, in areas of the foundation 10 where many structural columns are provided, the required shear strength was secured by increasing the height of the foundation 10. In contrast, in this embodiment, a reinforcement structure for the foundation 10 with excellent shear strength is used in areas of the foundation 10 where many structural columns are provided, so the required shear strength can be secured without increasing the height of the foundation 10.

[0058] <Example of changes> The above embodiment is an example 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 is not intended to limit its form. 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 embodiment. Examples of such forms include forms in which some of the configurations of the embodiment are replaced, modified, or omitted, or forms in which new configurations are added to the embodiment. Modifications of the embodiment are shown below.

[0059] The number of primary reinforcement bars 21 is not limited to two. There may be three or more primary reinforcement bars 21. The number of secondary reinforcement bars 31 is not limited to two. There may be three or more secondary reinforcement bars 31. The first longitudinal reinforcement bar 41 of the reinforcing bar 40 does not have to overlap with the first stirrups 22 when viewed from the first direction X. The second longitudinal reinforcement bar 42 of the reinforcing bar 40 does not have to overlap with the second stirrups 32 when viewed from the first direction X. Even in this case, at least effect (1) of the above embodiment can be obtained.

[0060] The first longitudinal bars 41 of the reinforcing bars 40 do not have to be positioned along the first stirrups 22. The second longitudinal bars 42 of the reinforcing bars 40 do not have to be positioned along the second stirrups 32. The reinforcing bars 40 may, for example, be tied to each first main bar 21 and also to each second main bar 31. Even in this case, at least the effect (1) of the above embodiment can be obtained.

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

[0062] In the above embodiment, the ends of the reinforcing bars constituting the reinforcing bars 40 were fixed to each other by welding, but they may also be fixed to each other by binding with binding wire. In the above embodiment, the reinforcing bar 40 was composed of a single reinforcing bar, but it may be composed of multiple reinforcing bars.

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

[0064] The first structural reinforcement 40a includes a first longitudinal structural reinforcement 41a and a second longitudinal structural reinforcement 42a extending in the vertical direction Z, and a first transverse reinforcement 43c which serves as a transverse reinforcement 43 connecting the lower end of the first longitudinal structural reinforcement 41a and the lower end of the second longitudinal structural reinforcement 42a.

[0065] The second structural muscle 40b includes a third longitudinal structural muscle 41b and a fourth longitudinal structural muscle 42b extending in the vertical direction Z, and a second transverse muscle 43d which serves as a transverse muscle 43 connecting the upper end of the third longitudinal structural muscle 41b and the upper end of the fourth longitudinal structural muscle 42b.

[0066] The first longitudinal muscle 41 is formed by the overlapping of the first longitudinal muscle 41a and the third longitudinal muscle 41b. In the examples shown in Figures 6 and 7, the entirety of the first longitudinal muscle 41a and the entirety of the third longitudinal muscle 41b overlap. The second longitudinal muscle 42 is formed by the overlapping of the second longitudinal muscle 42a and the fourth longitudinal muscle 42b. In the examples shown in Figures 6 and 7, the entirety of the second longitudinal muscle 42a and the entirety of the fourth longitudinal muscle 42b overlap. The first and second constituent muscles 40a and 40b form a hoop shape.

[0067] In the example shown in Figure 6, the reinforcing bars 40 are arranged such that the first longitudinal bar 41 follows the first rib 22 and the second longitudinal bar 42 follows the second rib 32. More specifically, the first structural bar 40a is arranged such that the first longitudinal structural bar 41a follows the first rib 22 and the second longitudinal structural bar 42a follows the second rib 32. The second structural bar 40b is arranged such that the third longitudinal structural bar 41b follows the first longitudinal structural bar 41a and the fourth longitudinal structural bar 42b follows the second longitudinal structural bar 42a. The first rib 22, the first longitudinal structural bar 41a, and the third longitudinal structural bar 41b are bound together by binding wire (not shown). The second rib 32, the second longitudinal structural bar 42a, and the fourth longitudinal structural bar 42b are bound together by binding wire (not shown).

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

[0069] The second structural muscle 40b may be positioned such that the third longitudinal structural muscle 41b follows the first rib muscle 22, and the fourth longitudinal structural muscle 42b follows the second rib muscle 32. The first structural muscle 40a may be positioned such that the first longitudinal structural muscle 41a follows the third longitudinal structural muscle 41b, and the second longitudinal structural muscle 42a follows the fourth longitudinal structural muscle 42b.

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

[0071] The number of horizontal reinforcement bars (43) in the reinforcing bar 40 may be three or more. The vertical Z position of the horizontal reinforcement 43 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 Z direction may differ from the dimensions of the first reinforcement unit 20 and the dimensions of the second reinforcement unit 30 in the vertical Z direction.

[0073] <Note> This specification discloses the following technologies: [Note 1] The reinforcement unit comprises a first reinforcement unit and a second reinforcement unit extending parallel to each other at intervals, where the direction in which the first and second reinforcement units extend is defined as the first direction, and the direction in which the first and second reinforcement units are aligned is defined as the second direction. The first reinforcement unit has a plurality of first main reinforcements extending in the first direction and spaced apart vertically, and a plurality of first stirrups connecting the plurality of first main reinforcements vertically and spaced apart vertically. The second reinforcement unit has a plurality of second main reinforcements extending in the first direction and spaced apart vertically, and a plurality of second main reinforcements connecting the plurality of second main reinforcements vertically. A reinforcement structure for a foundation comprising a plurality of second stirrups that are continuous and spaced apart in the first direction, wherein the plurality of first stirrups are located on the second reinforcement unit side of the plurality of first main reinforcements in the second direction, and the plurality of second stirrups are located on the first reinforcement unit side of the plurality of second main reinforcements in the second direction, and the plurality of reinforcing bars are located between the first main reinforcements and the second main reinforcements in a plan view and are spaced apart in the first direction, wherein the reinforcing bars comprise a first longitudinal bar and a second longitudinal bar extending in the vertical direction, and a transverse bar connecting the first longitudinal bar and the second longitudinal bar.

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

[0075] [Note 3] In the reinforcement structure of the foundation described in Appendix 1, the reinforcing bars are arranged such that the first longitudinal bars are along the first stirrups and the second longitudinal bars are along the second stirrups.

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

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

[0078] [Note 6] In the reinforcement structure of the foundation described in Appendix 4, the reinforcing bars are 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] [Note 7] In the reinforcement structure of the foundation described in Appendix 1, the reinforcing bars are composed of first and second structural bars, the first structural bar having first and second longitudinal structural bars extending in the vertical direction and a first transverse bar as the transverse bar connecting the lower end of the first longitudinal structural bar and the lower end of the second longitudinal structural bar, the second structural bar having third and fourth longitudinal structural bars extending in the vertical direction and a second transverse bar as the transverse bar connecting the upper end of the third longitudinal structural bar and the upper end of the fourth longitudinal structural bar, the first longitudinal bar is composed of the first and third longitudinal structural bars overlapping, and the second longitudinal bar is composed of the third and fourth longitudinal structural bars overlapping.

[0080] [Note 8] A foundation comprising a reinforced concrete section and a concrete section, having a reinforcement structure for the foundation as described in any one of the appendices 1 to 7.

[0081] [Note 9] A method for constructing a reinforced foundation structure as described in any one of the appendices 1 to 7, comprising: a first placement step of arranging the first reinforcement unit and the second reinforcement unit so as to be spaced apart and extending parallel to each other; and a second placement step of arranging a plurality of 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 stirrups, 30...Second reinforcement unit, 31...Second main reinforcement, 32...Second stirrups, 40...Reinforcement bars, 40a...First structural reinforcement, 40b...Second structural reinforcement, 41...First longitudinal reinforcement, 41a...First longitudinal structural reinforcement, 41b...Third longitudinal structural reinforcement, 42...Second longitudinal reinforcement, 42a...Second longitudinal structural reinforcement, 42b...Fourth longitudinal structural reinforcement, 43...Transverse reinforcement, 43a...Lower transverse reinforcement, 43b...Upper transverse reinforcement, 43c...First transverse reinforcement, 43d...Second transverse reinforcement, X...First direction, Y...Second direction, Z...Up and down direction.

Claims

1. It comprises a first reinforcement unit and a second reinforcement unit that extend parallel to each other with a gap in between, The direction in which the first reinforcement unit and the second reinforcement unit extend is defined as the first direction. When the direction in which the first reinforcement unit and the second reinforcement unit are aligned is defined as the second direction, The first reinforcement unit comprises a plurality of first main reinforcements extending in the first direction and spaced apart in the vertical direction, and a plurality of first stirrups connecting the plurality of first main reinforcements in the vertical direction and spaced apart in the first direction. The second reinforcement unit is a reinforcement structure for a foundation having a plurality of second main reinforcements extending in the first direction and spaced apart in the vertical direction, and a plurality of second stirrups connecting the plurality of second main reinforcements in the vertical direction and spaced apart in the first direction, The plurality of first stirrups are located on the second reinforcement unit side of the plurality of first main reinforcements in the second direction, The plurality of the second stirrups are located on the first reinforcement unit side of the plurality of the second main reinforcements in the second direction, In a plan view, the structure is provided with a plurality of reinforcing bars located between the first main reinforcement and the second main reinforcement, and arranged at intervals in the first direction. The reinforcement structure of the foundation comprises a first longitudinal reinforcement and a second longitudinal reinforcement extending in the vertical direction, and a transverse reinforcement connecting the first longitudinal reinforcement and the second longitudinal reinforcement.

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

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

4. The aforementioned horizontal lines are A lower transverse bar connecting the lower end of the first longitudinal bar and the lower end of the second longitudinal bar, An upper transverse bar connecting the upper end of the first vertical bar and the upper end of the second vertical bar, The reinforcement structure for the foundation according to claim 1, including the following:

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

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

7. The reinforcing muscle is composed of a first structural muscle and a second structural muscle. The first structural member comprises a first longitudinal structural member and a second longitudinal structural member extending in the vertical direction, and a first transverse structural member that serves as the transverse structural member connecting the lower end of the first longitudinal structural member and the lower end of the second longitudinal structural member. The second structural member comprises a third longitudinal structural member and a fourth longitudinal structural member extending in the vertical direction, and a second transverse structural member that serves as the transverse structural member connecting the upper end of the third longitudinal structural member and the upper end of the fourth longitudinal structural member. The first longitudinal muscle is formed by the overlapping of the first longitudinal muscle and the third longitudinal muscle. The reinforcement structure for a foundation according to claim 1, wherein the second longitudinal reinforcement is formed by the overlapping of the third longitudinal reinforcement and the fourth longitudinal reinforcement.

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

9. A method for constructing a reinforced concrete foundation structure according to any one of claims 1 to 7, A first arrangement step involves arranging the first reinforcement unit and the second reinforcement unit so that they extend parallel to each other with a gap between them, A second arrangement step involves arranging a plurality of reinforcing bars between the first main reinforcement and the second main reinforcement, Construction method for the reinforced concrete structure of the foundation, including [specific component].

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