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 toughness of the foundation. [Solution] The reinforcement structure of the foundation includes a plurality of reinforcing bars 40 arranged at intervals in a first direction X and surrounding a plurality of first main reinforcing bars 21 and a plurality of second main reinforcing bars 31 when viewed from the first direction X. Each reinforcing bar 40 is composed of a lower reinforcing bar 41 and an upper reinforcing bar 42. The lower reinforcing bars 41 include first lower vertical reinforcing bars 41a and second lower vertical reinforcing bars 41b extending in the vertical direction Z on both sides of the first main reinforcing bars 21 and second main reinforcing bars 31, and a lower horizontal reinforcing bar 41c connecting the first lower vertical reinforcing bars 41a and second lower vertical reinforcing bars 41b. The upper reinforcing bars 42 include first upper vertical reinforcing bars 42a and second upper vertical reinforcing bars 42b extending in the vertical direction Z on both sides of the first main reinforcing bars 21 and second main reinforcing bars 31, and an upper horizontal reinforcing bar 42c connecting the first upper vertical reinforcing bars 42a and second upper vertical reinforcing bars 42b. The multiple lower reinforcing bars 41 are connected by lower connecting bars 50.

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 occurs, vertical bending moments act on the foundation from the columns attached to the foundation, which is why there is a demand for improving the foundation's ductility. [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 each other at intervals, wherein a direction in which the first reinforcement unit and the second reinforcement unit extend is defined as a first direction, and a 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, 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 second stirrups connecting the plurality of second main reinforcements in the vertical direction and arranged at intervals in the first direction, the plurality of first main reinforcements being located closer to the second reinforcement unit than the plurality of first stirrups in the second direction, The second main reinforcement is located closer to the first reinforcement unit than the plurality of second stirrups in the second direction, is arranged at intervals in the first direction, and comprises a plurality of reinforcing bars surrounding the plurality of first main reinforcements and the plurality of second main reinforcements when viewed from the first direction, the reinforcing bars are composed of lower reinforcing bars and upper reinforcing bars, the lower reinforcing bars include first lower vertical reinforcements and second lower vertical reinforcements extending in the vertical direction on both sides of the first main reinforcements and the second main reinforcements, and lower horizontal reinforcements connecting the first lower vertical reinforcements and the second lower vertical reinforcements below the first reinforcement unit and the second reinforcement unit, the upper reinforcing bars include first upper vertical reinforcements and second upper vertical reinforcements extending in the vertical direction on both sides of the first main reinforcements and the second main reinforcements, and upper horizontal reinforcements connecting the first upper vertical reinforcements and the second upper vertical reinforcements above the first reinforcement unit and the second reinforcement unit, and the plurality of lower reinforcing bars are connected by lower connecting reinforcements.

[0006] According to this configuration, when viewed from the first direction, the plurality of first main reinforcements and the plurality of second main reinforcements are surrounded by the reinforcing bars, thereby improving the toughness of the foundation. For example, hoop-shaped reinforcement bars can be used as reinforcement bars surrounding the first and second main reinforcements. However, in this case, the first and second reinforcement units must be passed through the reinforcement bars, which makes installation difficult.

[0007] In contrast, with the above configuration, the reinforcing bars are composed of lower reinforcing bars and upper reinforcing bars. That is, the reinforcing bars are divided in the vertical direction. In this case, by arranging the multiple lower reinforcing bars, the first reinforcement unit, the second reinforcement unit, and the multiple upper reinforcing bars in this order, the multiple first main reinforcing bars and the multiple second main reinforcing bars can be surrounded by the lower reinforcing bars and the upper reinforcing bars, which improves workability.

[0008] Furthermore, the multiple lower reinforcement bars are connected by lower connecting bars. This prevents the multiple lower reinforcement bars from coming apart, making them easier to handle. Also, since the multiple lower reinforcement bars are self-supporting when placed, no fixtures are required to support them.

[0009] (2) In the reinforcement structure of the foundation of (1) above, the lower reinforcement is arranged so that the first lower vertical reinforcement overlaps the first stirrup and the second lower vertical reinforcement overlaps the second stirrup when viewed from the first direction, and the upper reinforcement is arranged so that the first upper vertical reinforcement overlaps the first stirrup and the second upper vertical reinforcement overlaps the second stirrup when viewed from the first direction.

[0010] With this configuration, the distance between the first and second reinforcement units is determined by the first and second lower vertical reinforcements of the lower reinforcement, eliminating the need for a jig to determine the distance between the first and second reinforcement units.

[0011] (3) In the reinforcement structure of the foundation of (1) or (2) above, the lower reinforcement is arranged so that the first lower vertical reinforcement is along the first stirrup and the second lower vertical reinforcement is along the second stirrup, and the upper reinforcement is arranged so that the first upper vertical reinforcement is along the first stirrup and the second upper vertical reinforcement is along the second stirrup.

[0012] With this configuration, the distance between the first and second reinforcement units is determined by the first and second lower vertical reinforcements of the lower reinforcement, eliminating the need for a jig to determine the distance between the first and second reinforcement units.

[0013] In addition, it becomes easier to perform the work of bundling the first lower vertical reinforcement and the first stirrup, the work of bundling the second lower vertical reinforcement and the second stirrup, the work of bundling the first upper vertical reinforcement and the first stirrup, and the work of bundling the second upper vertical reinforcement and the second stirrup.

[0014] (4) In the reinforcement structure for a foundation according to any one of the above (1) to (3), the upper reinforcing bars are connected by upper connecting bars. With this configuration, the multiple upper reinforcement bars do not come apart, making them easier to handle.

[0015] (5) A foundation that solves the above problems includes a reinforcing bar portion having the reinforcement structure of any one of the foundations (1) to (4) above, and a concrete portion. According to this configuration, when viewed from the first direction, the plurality of first main reinforcements and the plurality of second main reinforcements are surrounded by the reinforcing bars, thereby improving the toughness of the foundation.

[0016] For example, hoop-shaped reinforcement bars can be used as reinforcement bars surrounding the first and second main reinforcements. However, in this case, the first and second reinforcement units must be passed through the reinforcement bars, which makes installation difficult.

[0017] In contrast, with the above configuration, the reinforcing bars are composed of lower reinforcing bars and upper reinforcing bars. That is, the reinforcing bars are divided in the vertical direction. In this case, by arranging the multiple lower reinforcing bars, the first reinforcement unit, the second reinforcement unit, and the multiple upper reinforcing bars in this order, the multiple first main reinforcing bars and the multiple second main reinforcing bars can be surrounded by the lower reinforcing bars and the upper reinforcing bars, which improves workability.

[0018] Furthermore, the multiple lower reinforcement bars are connected by lower connecting bars. This prevents the multiple lower reinforcement bars from coming apart, making them easier to handle. Also, since the multiple lower reinforcement bars are self-supporting when placed, no fixtures are required to support them.

[0019] (6) A construction method for a foundation reinforcement structure for constructing any one of the foundation reinforcement structures (1) to (4) above, comprising a first arrangement step of arranging a plurality of the lower reinforcement bars connected by the lower connecting bars, a second 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 third arrangement step of arranging a plurality of the upper reinforcement bars.

[0020] This method is easy to install because it is possible to surround multiple first main reinforcements and multiple second main reinforcements with reinforcement bars without passing the first reinforcement unit and second reinforcement unit through the reinforcement bars. [Effects of the Invention]

[0021] According to the foundation reinforcement structure, foundation, and construction method for the foundation reinforcement structure disclosed herein, the toughness performance of the foundation can be improved. [Brief explanation of the drawings]

[0022] [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 a plurality of lower reinforcing bars and lower connecting bars. [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 the third arrangement step of the construction method for the reinforcement structure of the foundation. [Figure 7] FIG. 10 is a perspective view showing an upper reinforcing bar in a modified example. DETAILED DESCRIPTION OF THE INVENTION

[0023] 1 to 6, 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.

[0024] 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.

[0025] <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.

[0026] 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 main reinforcements 21 are located closer to the second reinforcement unit 30 than the plurality of first stirrups 22 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.

[0027] 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 main reinforcements 31 are located closer to the first reinforcement unit 20 than the second stirrups 32 in the second direction Y. The second main reinforcements 31 and the second stirrups 32 are fixed to each other by welding.

[0028] As shown in FIGS. 1 and 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. When viewed from the first direction X, each reinforcing bar 40 surrounds a plurality of first main reinforcing bars 21 and a plurality of second main reinforcing bars 31. Each reinforcing bar 40 is composed of a lower reinforcing bar 41 and an upper reinforcing bar 42. Each of the lower reinforcing bar 41 and the upper reinforcing bar 42 is composed of a single reinforcing bar bent.

[0029] 2 and 3, the lower reinforcement 41 includes first lower vertical reinforcements 41a, second lower vertical reinforcements 41b, and lower horizontal reinforcements 41c. The first lower vertical reinforcements 41a and second lower vertical reinforcements 41b extend in the vertical direction Z. The lower horizontal reinforcements 41c extend in the second direction Y.

[0030] In this embodiment, the first lower vertical reinforcement 41a overlaps with the first stirrup 22 when viewed from the first direction X. The second lower vertical reinforcement 41b overlaps with the second stirrup 32 when viewed from the first direction X. The first lower vertical reinforcement 41a and the second lower vertical reinforcement 41b are located on both sides of the first main reinforcement 21 and the second main reinforcement 31 in the second direction Y. In other words, the first main reinforcement 21 and the second main reinforcement 31 are located between the first lower vertical reinforcement 41a and the second lower vertical reinforcement 41b. The lower horizontal reinforcement 41c connects the lower end of the first lower vertical reinforcement 41a to the lower end of the second lower vertical reinforcement 41b on the lower side of the first reinforcement unit 20 and the second reinforcement unit 30.

[0031] The upper reinforcement bars 42 include first upper vertical bars 42a, second upper vertical bars 42b, and upper horizontal bars 42c. The first upper vertical bars 42a and second upper vertical bars 42b extend in the vertical direction Z. The upper horizontal bars 42c extend in the second direction Y.

[0032] In this embodiment, the first upper vertical reinforcement 42a overlaps the first stirrup 22 when viewed from the first direction X. The second upper vertical reinforcement 42b overlaps the second stirrup 32 when viewed from the first direction X. The first upper vertical reinforcement 42a and the second upper vertical reinforcement 42b are located on both sides of the first main reinforcement 21 and the second main reinforcement 31 in the second direction Y. In other words, the first main reinforcement 21 and the second main reinforcement 31 are located between the first upper vertical reinforcement 42a and the second upper vertical reinforcement 42b. The upper horizontal reinforcement 42c connects the upper end of the first upper vertical reinforcement 42a to the upper end of the second upper vertical reinforcement 42b on the upper side of the first reinforcement unit 20 and the second reinforcement unit 30.

[0033] As shown in FIG. 4 , multiple lower reinforcements 41 are connected by lower connecting bars 50 extending in the first direction X. In this embodiment, multiple lower reinforcements 41 are connected by two lower connecting bars 50. The two lower connecting bars 50 extend parallel to each other with a gap in the second direction Y. One lower connecting bar 50 is welded to the intersection of the first lower vertical bar 41 a and the lower horizontal bar 41 c in each lower reinforcement 41. The other lower connecting bar 50 is welded to the intersection of the second lower vertical bar 41 b and the lower horizontal bar 41 c in each lower reinforcement 41.

[0034] As shown in Figures 1 and 3, 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 first stirrups 22 and the second stirrups 32 are located between the lower reinforcing bars 41 and the upper reinforcing bars 42 in the first direction X. The lower reinforcing bars 41 are arranged so that the first lower vertical bars 41a are aligned with the first stirrups 22 and the second lower vertical bars 41b are aligned with the second stirrups 32. The upper reinforcing bars 42 are arranged so that the first upper vertical bars 42a are aligned with the first stirrups 22 and the second upper vertical bars 42b are aligned with the second stirrups 32.

[0035] The first lower vertical reinforcing bars 41a, the first stirrups 22, and the first upper vertical reinforcing bars 42a are bound together by binding wires (not shown). The second lower vertical reinforcing bars 41b, the second stirrups 32, and the second upper vertical reinforcing bars 42b are bound together by binding wires (not shown).

[0036] As long as each of the first lower vertical reinforcement 41a and the first upper vertical reinforcement 42a is tied to the first stirrup 22, and each of the second lower vertical reinforcement 41b and the second upper vertical reinforcement 42b is tied to the second stirrup 32, the positions and number of the binding points may be changed as appropriate.

[0037] As shown in Fig. 2, in this embodiment, of the two first main reinforcements 21, the lower first main reinforcement 21 is located above one of the lower connecting reinforcements 50. Of the two second main reinforcements 31, the lower second main reinforcement 31 is located above the other lower connecting reinforcement 50.

[0038] <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, a second arrangement step, and a third arrangement step. The first to third arrangement steps are performed in the order of the first arrangement step, the second arrangement step, and the third 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 at the 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 at the factory. The plurality of lower reinforcements 41 and lower connecting reinforcements 50 are connected in advance at the factory.

[0039] As shown in Fig. 4, the first placement step is a step of placing a plurality of lower reinforcing bars 41 connected by lower connecting bars 50. The plurality of lower reinforcing bars 41 are connected by the lower connecting bars 50 and therefore can stand on their own.

[0040] As shown in FIG. 5, the second arranging step is a step of arranging the first reinforcement unit 20 and the second reinforcement unit 30 so that they extend in parallel with each other with a gap therebetween. In the second arranging step, the first reinforcement unit 20 is arranged so that the first main reinforcements 21 are located closer to the second reinforcement unit 30 than the first stirrups 22 in the second direction Y. The second reinforcement unit 30 is arranged so that the second main reinforcements 31 are located closer to the first reinforcement unit 20 than the second stirrups 32 in the second direction Y.

[0041] In the second arrangement step, the first reinforcement unit 20 and the second reinforcement unit 30 are arranged so that the first main reinforcement 21 and the second main reinforcement 31 are located between the first lower vertical reinforcement 41a and the second lower vertical reinforcement 41b in the second direction Y. The first reinforcement unit 20 and the second reinforcement unit 30 are arranged so that the first main reinforcement 21 and the second main reinforcement 31 are located above the lower horizontal reinforcement 41c.

[0042] In the second arrangement step of this embodiment, the first reinforcement unit 20 is arranged so that the first stirrups 22 overlap the first lower vertical reinforcements 41a when viewed from the first direction X. The first reinforcement unit 20 is arranged so that the first stirrups 22 are aligned with the first lower vertical reinforcements 41a. The second reinforcement unit 30 is arranged so that the second stirrups 32 overlap the second lower vertical reinforcements 41b when viewed from the first direction X. The second reinforcement unit 30 is arranged so that the second stirrups 32 are aligned with the second lower vertical reinforcements 41b.

[0043] In the second placement step of this embodiment, the first reinforcement unit 20 is placed so that the lower of the two first main reinforcements 21 is located above one of the lower connecting reinforcements 50. The second reinforcement unit 30 is placed so that the lower of the two second main reinforcements 31 is located above the other lower connecting reinforcement 50.

[0044] As shown in Fig. 6, the third arrangement step is a step of arranging a plurality of upper reinforcements 42. In the third arrangement step, the plurality of upper reinforcements 42 are arranged so as to be spaced apart in the first direction X. The upper reinforcements 42 are arranged so that the first upper vertical reinforcements 42a and the second upper vertical reinforcements 42b are located on both sides of the first main reinforcements 21 and the second main reinforcements 31 in the second direction Y. The upper reinforcements 42 are arranged so that the upper horizontal reinforcements 42c are located above the first main reinforcements 21 and the second main reinforcements 31.

[0045] In the third arrangement step of this embodiment, the upper reinforcement 42 is arranged so that the first upper vertical reinforcement 42a overlaps the first stirrup 22 when viewed from the first direction X. The upper reinforcement 42 is arranged so that the second upper vertical reinforcement 42b overlaps the second stirrup 32 when viewed from the first direction X. The upper reinforcement 42 is arranged on the opposite side of the lower reinforcement 41 in the first direction X, with the first stirrup 22 and the second stirrup 32 in between. The upper reinforcement 42 is arranged so that the first upper vertical reinforcement 42a is along the first stirrup 22 and the second upper vertical reinforcement 42b is along the second stirrup 32.

[0046] In the third placement step of this embodiment, the upper reinforcement 42 is placed so that the upper cross reinforcement 42c rests on the first main reinforcement 21 located above the two first main reinforcements 21 and the second main reinforcement 31 located above the two second main reinforcements 31.

[0047] As a result, the reinforcing bars 40, which are made up of the lower reinforcing bars 41 and the upper reinforcing bars 42, surround the plurality of first main reinforcing bars 21 and the plurality of second main reinforcing bars 31 when viewed from the first direction X.

[0048] [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 main reinforcements 21 of the first reinforcement unit 20 are located closer to the second reinforcement unit 30 than the first stirrups 22 in the second direction Y. The second main reinforcements 31 of the second reinforcement unit 30 are located closer to the first reinforcement unit 20 than the second stirrups 32 in the second direction Y.

[0049] The reinforcement structure of the foundation 10 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 composed of a lower reinforcing bar 41 and an upper reinforcing bar 42.

[0050] The lower reinforcement 41 includes first lower vertical reinforcements 41a, second lower vertical reinforcements 41b, and lower horizontal reinforcements 41c. The first lower vertical reinforcements 41a and second lower vertical reinforcements 41b extend in the vertical direction Z on both sides of the first main reinforcements 21 and the second main reinforcements 31. The lower horizontal reinforcements 41c connect the first lower vertical reinforcements 41a and the second lower vertical reinforcements 41b on the lower sides of the first reinforcement unit 20 and the second reinforcement unit 30. The multiple lower reinforcement reinforcements 41 are connected by lower connecting reinforcements 50.

[0051] The upper reinforcement 42 includes first upper vertical reinforcements 42a, second upper vertical reinforcements 42b, and upper horizontal reinforcements 42c. The first upper vertical reinforcements 42a and second upper vertical reinforcements 42b extend in the vertical direction Z on both sides of the first main reinforcements 21 and the second main reinforcements 31. The upper horizontal reinforcements 42c connect the first upper vertical reinforcements 42a and the second upper vertical reinforcements 42b on the upper sides of the first reinforcement unit 20 and the second reinforcement unit 30.

[0052] According to this configuration, when viewed from the first direction X, the plurality of first main reinforcements 21 and the plurality of second main reinforcements 31 are surrounded by the reinforcing bars 40, and therefore the toughness of the foundation 10 is improved. For example, hoop-shaped reinforcement bars can be considered as reinforcement bars surrounding the plurality of first main reinforcements 21 and the plurality of second main reinforcements 31. 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 hoop-shaped reinforcement bars, which makes construction less easy.

[0053] In contrast, in this embodiment, the reinforcing bars 40 are composed of lower reinforcing bars 41 and upper reinforcing bars 42. That is, the reinforcing bars 40 are divided in the vertical direction Z. In this case, by arranging the plurality of lower reinforcing bars 41, the first reinforcement units 20 and the second reinforcement units 30, and the plurality of upper reinforcing bars 42 in this order, the plurality of first main reinforcing bars 21 and the plurality of second main reinforcing bars 31 can be surrounded by the lower reinforcing bars 41 and the upper reinforcing bars 42, which improves workability.

[0054] Furthermore, when placing the first reinforcement unit 20 and the second reinforcement unit 30, the first lower vertical reinforcement 41a and the second lower vertical reinforcement 41b of the lower reinforcement 41 that have already been placed can be used to determine the distance between the first reinforcement unit 20 and the second reinforcement unit 30. Therefore, a jig for determining the distance between the first reinforcement unit 20 and the second reinforcement unit 30 is not required.

[0055] Furthermore, the multiple lower reinforcements 41 are connected by lower connecting bars 50. This prevents the multiple lower reinforcements 41 from coming apart, making it easier to handle the multiple lower reinforcements 41. Also, when the multiple lower reinforcements 41 are placed, the multiple lower reinforcements 41 are self-supporting, so no jig is required to support the lower reinforcements 41.

[0056] [Effects of this embodiment] The effects of this embodiment will be described. (1) When viewed from the first direction X, the plurality of first main reinforcements 21 and the plurality of second main reinforcements 31 are surrounded by the reinforcing bars 40, thereby improving the toughness of the foundation 10.

[0057] Furthermore, the reinforcing bars 40 are composed of lower reinforcing bars 41 and upper reinforcing bars 42. That is, the reinforcing bars 40 are divided in the vertical direction Z. In this case, by arranging the plurality of lower reinforcing bars 41, the first reinforcement units 20 and the second reinforcement units 30, and the plurality of upper reinforcing bars 42 in this order, the reinforcing bars 40 can surround the plurality of first main reinforcing bars 21 and the plurality of second main reinforcing bars 31, which improves workability.

[0058] Furthermore, the multiple lower reinforcements 41 are connected by lower connecting bars 50. This prevents the multiple lower reinforcements 41 from coming apart, making it easier to handle the multiple lower reinforcements 41. Also, when the multiple lower reinforcements 41 are placed, the multiple lower reinforcements 41 are self-supporting, eliminating the need for a jig to support the lower reinforcements 41.

[0059] (2) When viewed from the first direction X, the lower reinforcement 41 is arranged so that the first lower vertical reinforcement 41a overlaps the first stirrup 22 and the second lower vertical reinforcement 41b overlaps the second stirrup 32. When viewed from the first direction X, the upper reinforcement 42 is arranged so that the first upper vertical reinforcement 42a overlaps the first stirrup 22 and the second upper vertical reinforcement 42b overlaps the second stirrup 32.

[0060] According to this configuration, the distance between the first reinforcement unit 20 and the second reinforcement unit 30 is determined by the first lower vertical reinforcement 41a and the second lower vertical reinforcement 41b of the lower reinforcement 41. Therefore, a jig for determining the distance between the first reinforcement unit 20 and the second reinforcement unit 30 is not required.

[0061] (3) The lower reinforcement 41 is arranged so that the first lower vertical reinforcement 41a is aligned with the first stirrup 22 and the second lower vertical reinforcement 41b is aligned with the second stirrup 32. The upper reinforcement 42 is arranged so that the first upper vertical reinforcement 42a is aligned with the first stirrup 22 and the second upper vertical reinforcement 42b is aligned with the second stirrup 32.

[0062] This configuration also provides the above-mentioned effect (2). In addition, it becomes easier to perform the work of bundling the first lower vertical reinforcement 41a to the first stirrup 22, the work of bundling the second lower vertical reinforcement 41b to the second stirrup 32, the work of bundling the first upper vertical reinforcement 42a to the first stirrup 22, and the work of bundling the second upper vertical reinforcement 42b to the second stirrup 32.

[0063] (4) The construction method of the reinforcement structure of the foundation 10 includes a first arrangement step, a second arrangement step, and a third arrangement step. The first arrangement step is a step of arranging a plurality of lower reinforcement bars 41 connected by lower connecting bars 50. The second arrangement step is a step of arranging the first reinforcement unit 20 and the second reinforcement unit 30 so that they extend parallel to each other with a gap between them. The third arrangement step is a step of arranging a plurality of upper reinforcement bars 42.

[0064] According to this method, the first reinforcement unit 20 and the second reinforcement unit 30 do not have to be passed through the reinforcement 40, and multiple first main reinforcements 21 and multiple second main reinforcements 31 can be surrounded by the reinforcement 40, making it easy to install.

[0065] (5) In the portion of the foundation 10 where many structural columns are installed, the bending moment acting on the foundation 10 in the vertical direction Z is larger than in other portions. For this reason, the portion of the foundation 10 where many structural columns are installed requires higher toughness than other portions. Therefore, if the toughness of the portion of the foundation 10 where many structural columns are installed is insufficient, the placement of the structural columns has been restricted, such as by dispersing the structural columns. In this embodiment, a reinforcement structure of the foundation 10 with high toughness is used in the portion of the foundation 10 where many structural columns are installed, so the required toughness can be ensured. This increases the degree of freedom in the placement of the structural columns.

[0066] (6) The first lower vertical reinforcement 41a and the first upper vertical reinforcement 42a can improve the shear strength of the foundation 10. The second lower vertical reinforcement 41b and the second upper vertical reinforcement 42b can improve the shear strength of the foundation 10.

[0067] (7) The first lower vertical reinforcements 41a and the first upper vertical reinforcements 42a are tied to the first stirrups 22. In this case, the overlap amount between the first lower vertical reinforcements 41a or the first upper vertical reinforcements 42a and the first stirrups 22 required to ensure the desired shear strength is smaller than the overlap amount between the first lower vertical reinforcements 41a and the first upper vertical reinforcements 42a when the first lower vertical reinforcements 41a and the first upper vertical reinforcements 42a are tied together. Therefore, the lengths of the first lower vertical reinforcements 41a and the first upper vertical reinforcements 42a can be shortened.

[0068] Similarly, the second lower vertical reinforcements 41b and the second upper vertical reinforcements 42b are tied to the second stirrups 32, respectively. In this case, the overlap amount between the second lower vertical reinforcements 41b or the second upper vertical reinforcements 42b and the second stirrups 32 required to ensure the desired shear strength is smaller than the overlap amount between the second lower vertical reinforcements 41b and the second upper vertical reinforcements 42b when the second lower vertical reinforcements 41b and the second upper vertical reinforcements 42b are tied together. Therefore, the lengths of the second lower vertical reinforcements 41b and the second upper vertical reinforcements 42b can be shortened.

[0069] <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.

[0070] 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 lower vertical reinforcing bar 41a of the lower reinforcement bar 41 does not have to overlap with the first stirrup 22 when viewed from the first direction X. The second lower vertical reinforcing bar 41b of the lower reinforcement bar 41 does not have to overlap with the second stirrup 32 when viewed from the first direction X.

[0071] Similarly, the first upper vertical reinforcing bar 42a of the upper reinforcement bar 42 does not have to overlap with the first stirrup 22 when viewed from the first direction X. The second upper vertical reinforcing bar 42b of the upper reinforcement bar 42 does not have to overlap with the second stirrup 32 when viewed from the first direction X.

[0072] Even in this case, at least the effect (1) of the above embodiment can be obtained. The first lower vertical reinforcing bar 41a of the lower reinforcement bar 41 does not have to be arranged along the first stirrup 22. The second lower vertical reinforcing bar 41b of the lower reinforcement bar 41 does not have to be arranged along the second stirrup 32.

[0073] Similarly, the first upper vertical reinforcing bar 42a of the upper reinforcement bar 42 does not have to be arranged along the first stirrup 22. The second upper vertical reinforcing bar 42b of the upper reinforcement bar 42 does not have to be arranged along the second stirrup 32.

[0074] For example, the first lower vertical reinforcing bar 41a of the lower reinforcement bar 41 and the first upper vertical reinforcing bar 42a of the upper reinforcement bar 42 may be bound together, and the second lower vertical reinforcing bar 41b of the lower reinforcement bar 41 and the second upper vertical reinforcing bar 42b of the upper reinforcement bar 42 may be bound together. Even in this case, at least the effect (1) of the above embodiment can be obtained.

[0075] The number of lower connecting bars 50 is not limited to two. The number of lower connecting bars 50 may be one, or three or more. The position of the lower connecting reinforcement 50 in the second direction Y may be changed as appropriate. The lower connecting reinforcement 50 does not have to be located below the first main reinforcement 21 or the second main reinforcement 31.

[0076] As shown in Fig. 7, multiple upper reinforcements 42 may be connected by upper connecting reinforcements 60. In this case, the multiple upper reinforcements 42 do not come apart, making it easier to handle the multiple upper reinforcements 42. In the example shown in Fig. 7, there are two upper connecting reinforcements 60, but the number of upper connecting reinforcements 60 may be one, or three or more.

[0077] <Additional Notes> This specification discloses the following techniques: [Appendix 1] a reinforcement structure for a foundation comprising a first reinforcement unit and a second reinforcement unit extending in parallel at intervals, wherein a direction in which the first reinforcement unit and the second reinforcement unit extend is defined as a first direction and a 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, 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 second stirrups connecting the plurality of second main reinforcements in the vertical direction and lined up at intervals in the first direction, the plurality of first main reinforcements being located closer to the second reinforcement unit than the plurality of first stirrups in the second direction, a plurality of reinforcing bars that are located closer to the first reinforcement unit than the plurality of second stirrups, are arranged at intervals in the first direction, and surround the plurality of first main reinforcements and the plurality of second main reinforcements when viewed from the first direction, the reinforcing bars being composed of lower reinforcement bars and upper reinforcement bars, the lower reinforcement bars having first lower vertical reinforcement bars and second lower vertical reinforcement bars extending in the vertical direction on both sides of the first main reinforcement bars and the second main reinforcement bars, and lower horizontal reinforcement bars connecting the first lower vertical reinforcement bars and the second lower vertical reinforcement bars below the first reinforcement unit and the second reinforcement unit, the upper reinforcement bars having first upper vertical reinforcement bars and second upper vertical reinforcement bars extending in the vertical direction on both sides of the first main reinforcement bars and the second main reinforcement bars, and upper horizontal reinforcement bars connecting the first upper vertical reinforcement bars and the second upper vertical reinforcement bars above the first reinforcement unit and the second reinforcement unit,

[0078] [Appendix 2] In the reinforcement structure of the foundation described in Appendix 1, the lower reinforcement is arranged so that the first lower vertical reinforcement overlaps the first stirrup and the second lower vertical reinforcement overlaps the second stirrup when viewed from the first direction, and the upper reinforcement is arranged so that the first upper vertical reinforcement overlaps the first stirrup and the second upper vertical reinforcement overlaps the second stirrup when viewed from the first direction.

[0079] [Appendix 3] In the reinforcement structure of the foundation described in Appendix 1, the lower reinforcement is arranged so that the first lower vertical reinforcement is along the first stirrup and the second lower vertical reinforcement is along the second stirrup, and the upper reinforcement is arranged so that the first upper vertical reinforcement is along the first stirrup and the second upper vertical reinforcement is along the second stirrup.

[0080] [Appendix 4] In the foundation reinforcement structure described in Appendix 1, the plurality of upper reinforcing bars are connected by upper connecting bars.

[0081] [Appendix 5] A foundation comprising a reinforcing bar portion having the reinforcement structure of any one of appendices 1 to 4, and a concrete portion.

[0082] [Appendix 6] A construction method for a foundation reinforcement structure for constructing the foundation reinforcement structure described in any one of Appendices 1 to 4, comprising: a first arrangement step of arranging a plurality of the lower reinforcement bars connected by the lower connecting bars; a second 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 third arrangement step of arranging a plurality of the upper reinforcement bars. [Explanation of symbols]

[0083] 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, 41...lower reinforcement, 41a...first lower vertical reinforcement, 41b...second lower vertical reinforcement, 41c...lower horizontal reinforcement, 42...upper reinforcement, 42a...first upper vertical reinforcement, 42b...second upper vertical reinforcement, 42c...upper horizontal reinforcement, 50...lower connecting reinforcement, 60...upper connecting 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 first main reinforcements are located closer to the second reinforcement unit than the first stirrups in the second direction, The plurality of second main reinforcements are located closer to the first reinforcement unit than the plurality of second stirrups in the second direction, A plurality of reinforcing bars are arranged at intervals in the first direction and surround the plurality of first main reinforcements and the plurality of second main reinforcements when viewed from the first direction, The reinforcing bars are composed of lower reinforcing bars and upper reinforcing bars, The lower reinforcement includes first lower vertical reinforcements and second lower vertical reinforcements extending in the vertical direction on both sides of the first main reinforcements and the second main reinforcements, and lower horizontal reinforcements connecting the first lower vertical reinforcements and the second lower vertical reinforcements below the first reinforcement unit and the second reinforcement unit, The upper reinforcement includes first upper vertical reinforcements and second upper vertical reinforcements extending in the vertical direction on both sides of the first main reinforcements and the second main reinforcements, and upper horizontal reinforcements connecting the first upper vertical reinforcements and the second upper vertical reinforcements above the first reinforcement unit and the second reinforcement unit, A reinforcement structure for a foundation in which the plurality of lower reinforcing bars are connected by lower connecting bars.

2. The lower reinforcement is arranged so that, when viewed from the first direction, the first lower vertical reinforcement overlaps the first stirrup and the second lower vertical reinforcement overlaps the second stirrup; The reinforcement structure of a foundation according to claim 1, wherein the upper reinforcement bars are arranged such that the first upper vertical reinforcement bars overlap the first stirrups and the second upper vertical reinforcement bars overlap the second stirrups when viewed from the first direction.

3. The lower reinforcement is arranged so that the first lower vertical reinforcement is along the first stirrup and the second lower vertical reinforcement is along the second stirrup, The reinforcement structure of a foundation according to claim 1, wherein the upper reinforcement is arranged so that the first upper vertical reinforcement is aligned with the first stirrup and the second upper vertical reinforcement is aligned with the second stirrup.

4. The reinforcement structure for a foundation according to claim 1 , wherein the plurality of upper reinforcing bars are connected by upper connecting bars.

5. A reinforcing bar portion having the reinforcement structure of the foundation according to any one of claims 1 to 4; Concrete section and A foundation that provides.

6. 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 4, a first placement step of placing a plurality of the lower reinforcing bars connected by the lower connecting bars; a second arranging step of arranging the first reinforcement unit and the second reinforcement unit so as to extend in parallel with a gap therebetween; a third placement step of placing a plurality of the upper reinforcing bars; Construction method for reinforcement structure of foundation including.

Images