Foundation reinforcement structure, foundation, and construction method of foundation reinforcement structure
The foundation reinforcement structure addresses toughness and workability issues by using lower and upper reinforcing bars to surround main reinforcements, enhancing ductility and construction efficiency while allowing flexible column arrangements.
Patent Information
- Authority / Receiving Office
- JP · JP
- Patent Type
- Applications
- Current Assignee / Owner
- SEKISUI HOUSE KK
- Filing Date
- 2024-10-21
- Publication Date
- 2026-05-07
AI Technical Summary
Existing foundation reinforcement structures face challenges in improving toughness performance, particularly during earthquakes, due to the vertical bending moment acting on foundations from columns, and suffer from poor workability in assembling reinforcement units.
A foundation reinforcement structure comprising first and second reinforcement units with main reinforcements and stirrups, surrounded by lower and upper reinforcing bars, which are connected and arranged to enhance ductility and workability, eliminating the need for jigs to determine spacing and facilitate assembly.
The structure improves the toughness and ductility of foundations, enhances workability during construction, and allows for flexible column arrangement by ensuring self-supporting lower reinforcing bars and reduced overlap requirements, thus improving construction efficiency.
Smart Images
Figure 2026074815000001_ABST
Abstract
Description
Technical Field
[0001] The present disclosure relates to a foundation reinforcement structure, a foundation, and a construction method of a foundation reinforcement structure.
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 vertically. 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 of each stirrup is welded to the upper beam main reinforcement. The lower end 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 vertical bending moment acts on the foundation from the column provided on the foundation. Therefore, an improvement in the toughness performance of the foundation is required.
Means for Solving the Problems
[0005] (1) A foundation reinforcement structure 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, 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, and 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 stirrups connecting the plurality of second main reinforcements vertically and spaced apart vertically, wherein the plurality of first main reinforcements are located on the second reinforcement unit side of the plurality of first stirrups in the second direction, and the plurality of the The two main reinforcements are located on the first reinforcement unit side of the plurality of second stirrups in the second direction, are spaced apart in the first direction, and comprise a plurality of reinforcing bars that 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 reinforcing bars have a first lower longitudinal bar and a second lower longitudinal bar extending vertically on both sides of the first and second main reinforcements, and a lower transverse bar connecting the first and second lower longitudinal bars below the first and second reinforcement units. The upper reinforcing bars have a first upper longitudinal bar and a second upper longitudinal bar extending vertically on both sides of the first and second main reinforcements, and an upper transverse bar connecting the first and second upper longitudinal bars above the first and second reinforcement units. The plurality of lower reinforcing bars are connected by lower connecting bars.
[0006] In this configuration, when viewed from the first direction, the multiple first main reinforcements and multiple second main reinforcements are surrounded by reinforcing bars, thus improving the ductility of the foundation. As reinforcing bars surrounding multiple first main reinforcements and multiple second main reinforcements, hoop-shaped reinforcing bars can be considered, for example. However, in this case, the first reinforcement unit and the second reinforcement unit must be passed through the reinforcing bars, which results in poor workability.
[0007] In contrast, according to 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 multiple lower reinforcing bars, a first reinforcement unit and a second reinforcement unit, and multiple upper reinforcing bars in that order, multiple first main reinforcements and multiple second main reinforcements can be surrounded by the lower and upper reinforcing bars, resulting in good constructability.
[0008] Furthermore, multiple lower reinforcing bars are connected by lower connecting bars. This prevents the multiple lower reinforcing bars from separating, making them easier to handle. Also, since the multiple lower reinforcing bars are self-supporting when placed, there is no need for jigs to support them.
[0009] (2) In the reinforcement structure of the foundation described in (1) above, the lower reinforcing bars are arranged such that, when viewed from the first direction, the first lower longitudinal bar overlaps with the first stirrup and the second lower longitudinal bar overlaps with the second stirrup, and the upper reinforcing bars are arranged such that, when viewed from the first direction, the first upper longitudinal bar overlaps with the first stirrup and the second upper longitudinal bar overlaps with the second stirrup.
[0010] In this configuration, the spacing between the first and second reinforcement units is determined by the first and second lower longitudinal bars of the lower reinforcing bars. Therefore, a jig is not required to determine the spacing between the first and second reinforcement units.
[0011] (3) In the reinforcement structure of the foundation according to (1) or (2) above, the lower reinforcing bars are arranged such that the first lower longitudinal bar follows the first stirrup and the second lower longitudinal bar follows the second stirrup, and the upper reinforcing bars are arranged such that the first upper longitudinal bar follows the first stirrup and the second upper longitudinal bar follows the second stirrup.
[0012] In this configuration, the spacing between the first and second reinforcement units is determined by the first and second lower longitudinal bars of the lower reinforcing bars. Therefore, a jig is not required to determine the spacing between the first and second reinforcement units.
[0013] Furthermore, it facilitates tying the first lower longitudinal reinforcement to the first stirrup, the second lower longitudinal reinforcement to the second stirrup, the first upper longitudinal reinforcement to the first stirrup, and the second upper longitudinal reinforcement to the second stirrup.
[0014] (4) In any one of the foundation reinforcement structures described in (1) to (3) above, the multiple upper reinforcing bars are connected by upper connecting bars. This configuration prevents the multiple upper reinforcing bars from becoming separated, making it easier to handle them individually.
[0015] (5) 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 (4) above, and a concrete section. In this configuration, when viewed from the first direction, the multiple first main reinforcements and multiple second main reinforcements are surrounded by reinforcing bars, thus improving the ductility of the foundation.
[0016] As reinforcing bars surrounding multiple first main reinforcements and multiple second main reinforcements, hoop-shaped reinforcing bars can be considered, for example. However, in this case, the first reinforcement unit and the second reinforcement unit must be passed through the reinforcing bars, which results in poor workability.
[0017] In contrast, according to 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 plurality of lower reinforcing bars, the first reinforcement unit, the second reinforcement unit, and the plurality of upper reinforcing bars in this order, the plurality of first main bars and the plurality of second main bars can be surrounded by the lower reinforcing bars and the upper reinforcing bars, so the workability is good.
[0018] Furthermore, the plurality of lower reinforcing bars are connected by lower connecting bars. As a result, the plurality of lower reinforcing bars do not become scattered, so it becomes easier to handle the plurality of lower reinforcing bars. In addition, when the plurality of lower reinforcing bars are arranged, the plurality of lower reinforcing bars are self-supporting, so a jig for supporting the lower reinforcing bars is not required.
[0019] (6) A construction method of the reinforcement structure of the foundation for constructing the reinforcement structure of the foundation according to any one of (1) to (4) above, including a first placement step of arranging the plurality of lower reinforcing bars connected by the lower connecting bars, a second placement step of arranging the first reinforcement unit and the second reinforcement unit so as to extend in parallel with a gap therebetween, and a third placement step of arranging the plurality of upper reinforcing bars.
[0020] According to this method, the plurality of first main bars and the plurality of second main bars can be surrounded by the reinforcing bars without passing the first reinforcement unit and the second reinforcement unit through the reinforcing bars, so the workability is good.
Advantages of the Invention
[0021] According to the reinforcement structure of the foundation, the foundation, and the construction method of the reinforcement structure of the foundation of the present disclosure, the toughness performance of the foundation can be improved.
Brief Description of the Drawings
[0022] [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 reinforcement structure of the foundation. [Figure 4] It is a perspective view showing a plurality of lower reinforcing bars and lower connecting bars. [Figure 5] It is a perspective view showing the second placement process of the construction method of the reinforcement structure of the foundation. [Figure 6] It is a perspective view showing the third placement process of the construction method of the reinforcement structure of the foundation. [Figure 7] It is a perspective view showing the upper reinforcing bars in the modification example.
Mode for Carrying Out the Invention
[0023] Referring to FIGS. 1 to 6, the reinforcement structure of the foundation 10, the foundation 10, and the construction method of the reinforcement structure of the foundation 10 in the present 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 the present embodiment are used for low-rise buildings or mid-rise buildings.
[0024] As shown in FIGS. 1 and 2, the foundation 10 is made of reinforced concrete. The foundation 10 has a reinforcing bar part 11 and a concrete part 12. The reinforcement structure of the foundation 10 in the present embodiment is used in a part of the foundation 10 where many structural columns are provided. The part of the foundation 10 where many structural columns are provided is, for example, around water areas such as bathrooms, toilets, washrooms, etc. and stairs.
[0025] <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 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. 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 main reinforcements 31 are located on the first reinforcement unit 20 side of the multiple second stirrups 32 in the second direction Y. The multiple second main reinforcements 31 and the multiple second stirrups 32 are fixed to each other by welding.
[0028] As shown in Figures 1 and 3, the reinforced concrete section 11 is provided with multiple reinforcing bars 40. The multiple reinforcing bars 40 are arranged at intervals in the first direction X. Each reinforcing bar 40 surrounds multiple first main reinforcements 21 and multiple second main reinforcements 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 bar 41 and the upper reinforcing bar 42 are each formed by bending a single reinforcing bar.
[0029] As shown in Figures 2 and 3, the lower reinforcing bar 41 has a first lower longitudinal bar 41a, a second lower longitudinal bar 41b, and a lower transverse bar 41c. The first lower longitudinal bar 41a and the second lower longitudinal bar 41b extend in the vertical direction Z. The lower transverse bar 41c extends in the second direction Y.
[0030] In this embodiment, the first lower vertical reinforcement bar 41a overlaps with the first stirrup bar 22 when viewed from the first direction X. The second lower vertical reinforcement bar 41b overlaps with the second stirrup bar 32 when viewed from the first direction X. The first lower vertical reinforcement bar 41a and the second lower vertical reinforcement bar 41b are located on both sides of the first main reinforcement bar 21 and the second main reinforcement bar 31 in the second direction Y. In other words, the first main reinforcement bar 21 and the second main reinforcement bar 31 are located between the first lower vertical reinforcement bar 41a and the second lower vertical reinforcement bar 41b. The lower horizontal reinforcement bar 41c connects the lower end of the first lower vertical reinforcement bar 41a and the lower end of the second lower vertical reinforcement bar 41b on the lower side of the first reinforcement unit 20 and the second reinforcement unit 30.
[0031] The upper reinforcing bar 42 has a first upper longitudinal bar 42a, a second upper longitudinal bar 42b, and an upper transverse bar 42c. The first upper longitudinal bar 42a and the second upper longitudinal bar 42b extend in the vertical direction Z. The upper transverse bar 42c extends in the second direction Y.
[0032] In this embodiment, the first upper vertical reinforcement 42a overlaps with the first stirrup 22 when viewed from the first direction X. The second upper vertical reinforcement 42b overlaps with 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 and the upper end of the second upper vertical reinforcement 42b above the first reinforcement unit 20 and the second reinforcement unit 30.
[0033] As shown in Figure 4, the multiple lower reinforcing bars 41 are connected by lower connecting bars 50 extending in the first direction X. In this embodiment, the multiple lower reinforcing bars 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 of the lower connecting bars 50 is welded to the portion where the first lower longitudinal bar 41a and the lower transverse bar 41c intersect in each lower reinforcing bar 41. The other lower connecting bar 50 is welded to the portion where the second lower longitudinal bar 41b and the lower transverse bar 41c intersect in each lower reinforcing bar 41.
[0034] As shown in Figures 1 and 3, 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 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 positioned such that the first lower longitudinal bar 41a follows the first stirrups 22 and the second lower longitudinal bar 41b follows the second stirrups 32. The upper reinforcing bars 42 are positioned such that the first upper longitudinal bar 42a follows the first stirrups 22 and the second upper longitudinal bar 42b follows the second stirrups 32.
[0035] The first lower longitudinal reinforcement 41a, the first stirrup 22, and the first upper longitudinal reinforcement 42a are tied together with binding wire (not shown). The second lower longitudinal reinforcement 41b, the second stirrup 32, and the second upper longitudinal reinforcement 42b are tied together with binding wire (not shown).
[0036] If the first lower longitudinal bar 41a and the first upper longitudinal bar 42a are each tied to the first stirrup 22, and the second lower longitudinal bar 41b and the second upper longitudinal bar 42b are each tied to the second stirrup 32, the position and number of tying points may be changed as appropriate.
[0037] As shown in Figure 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 for the reinforcement structure of foundation 10> The construction method for the reinforcement structure of foundation 10 will be described. The reinforcement structure of foundation 10 will be constructed by workers. The construction method for the reinforcement structure of foundation 10 includes a first placement process, a second placement process, and a third placement process. The first to third placement processes are performed in the order of the first placement process, the second placement process, and the third 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. Multiple lower reinforcing bars 41 and lower connecting bars 50 are pre-connected in the factory.
[0039] As shown in Figure 4, the first placement step is to place a plurality of lower reinforcing bars 41 connected by lower connecting bars 50. Since the plurality of lower reinforcing bars 41 are connected by lower connecting bars 50, they are self-supporting.
[0040] As shown in Figure 5, the second 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 second placement process, the first reinforcement unit 20 is positioned such that multiple first main reinforcements 21 are located on the second reinforcement unit 30 side of multiple first stirrups 22 in the second direction Y. The second reinforcement unit 30 is positioned such that multiple second main reinforcements 31 are located on the first reinforcement unit 20 side of multiple second stirrups 32 in the second direction Y.
[0041] In the second placement process, the first reinforcement unit 20 and the second reinforcement unit 30 are positioned such that in the second direction Y, 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 first reinforcement unit 20 and the second reinforcement unit 30 are positioned such 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 such that the first stirrups 22 overlap with the first lower longitudinal reinforcement 41a when viewed from the first direction X. The first reinforcement unit 20 is arranged such that the first stirrups 22 are aligned with the first lower longitudinal reinforcement 41a. The second reinforcement unit 30 is arranged such that the second stirrups 32 overlap with the second lower longitudinal reinforcement 41b when viewed from the first direction X. The second reinforcement unit 30 is arranged such that the second stirrups 32 are aligned with the second lower longitudinal reinforcement 41b.
[0043] In the second arrangement step of this embodiment, the first reinforcement unit 20 is arranged such that the lower of the two first main reinforcements 21 is positioned above one of the lower connecting reinforcements 50. The second reinforcement unit 30 is arranged such that the lower of the two second main reinforcements 31 is positioned above the other lower connecting reinforcement 50.
[0044] As shown in Figure 6, the third placement step is the step of placing multiple upper reinforcing bars 42. In the third placement step, the multiple upper reinforcing bars 42 are placed so as to be spaced apart in the first direction X. The upper reinforcing bars 42 are placed so that in the second direction Y, the first upper vertical bar 42a and the second upper vertical bar 42b are located on both sides of the first main bar 21 and the second main bar 31. The upper reinforcing bars 42 are placed so that the upper horizontal bar 42c is located above the first main bar 21 and the second main bar 31.
[0045] In the third arrangement step of this embodiment, the upper reinforcing bars 42 are arranged such that the first upper longitudinal bar 42a overlaps with the first stirrup bar 22 when viewed from the first direction X. The upper reinforcing bars 42 are arranged such that the second upper longitudinal bar 42b overlaps with the second stirrup bar 32 when viewed from the first direction X. The upper reinforcing bars 42 are arranged on the opposite side of the lower reinforcing bars 41 from the first stirrup bar 22 and the second stirrup bar 32 in the first direction X. The upper reinforcing bars 42 are arranged such that the first upper longitudinal bar 42a follows the first stirrup bar 22 and the second upper longitudinal bar 42b follows the second stirrup bar 32.
[0046] In the third placement step of this embodiment, the upper reinforcing bar 42 is positioned such that the upper transverse bar 42c rests on the upper of the two first main bars 21 and the upper of the two second main bars 31.
[0047] As a result, the reinforcing bar 40, which is composed of the lower reinforcing bar 41 and the upper reinforcing bar 42, surrounds the multiple first main reinforcements 21 and the multiple second main reinforcements 31 when viewed from the first direction X.
[0048] [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 main reinforcements 21 of the first reinforcement unit 20 are located on the second reinforcement unit 30 side of the multiple first stirrups 22 in the second direction Y. The multiple second main reinforcements 31 of the second reinforcement unit 30 are located on the first reinforcement unit 20 side of the multiple second stirrups 32 in the second direction Y.
[0049] The reinforcement structure of the foundation 10 includes multiple reinforcing bars 40. The multiple 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 reinforcing bars 41 include a first lower longitudinal bar 41a, a second lower longitudinal bar 41b, and a lower transverse bar 41c. The first lower longitudinal bar 41a and the second lower longitudinal bar 41b extend in the vertical direction Z on both sides of the first main bar 21 and the second main bar 31. The lower transverse bar 41c connects the first lower longitudinal bar 41a and the second lower longitudinal bar 41b on the lower side of the first reinforcement unit 20 and the second reinforcement unit 30. The multiple lower reinforcing bars 41 are connected by lower connecting bars 50.
[0051] The upper reinforcing bar 42 has a first upper longitudinal bar 42a, a second upper longitudinal bar 42b, and an upper transverse bar 42c. The first upper longitudinal bar 42a and the second upper longitudinal bar 42b extend in the vertical direction Z on both sides of the first main bar 21 and the second main bar 31. The upper transverse bar 42c connects the first upper longitudinal bar 42a and the second upper longitudinal bar 42b on the upper side of the first reinforcement unit 20 and the second reinforcement unit 30.
[0052] With this configuration, when viewed from the first direction X, the multiple first main reinforcements 21 and the multiple second main reinforcements 31 are surrounded by the reinforcing bars 40, thereby improving the ductility of the foundation 10. As reinforcing bars surrounding multiple first main reinforcements 21 and multiple second main reinforcements 31, hoop-shaped reinforcing bars can be considered, for example. However, in this case, it is necessary to pass the pre-assembled first reinforcement units 20 and second reinforcement units 30 through the hoop-shaped reinforcing bars, which results in poor workability.
[0053] In contrast, in this embodiment, the reinforcing bar 40 is composed of a lower reinforcing bar 41 and an upper reinforcing bar 42. That is, the reinforcing bar 40 is divided in the vertical direction Z. In this case, by arranging the multiple lower reinforcing bars 41, the first reinforcement unit 20 and the second reinforcement unit 30, and the multiple upper reinforcing bars 42 in that order, the multiple first main reinforcements 21 and the multiple second main reinforcements 31 can be surrounded by the lower reinforcing bars 41 and the upper reinforcing bars 42, resulting in good workability.
[0054] Furthermore, when arranging the first reinforcement unit 20 and the second reinforcement unit 30, the spacing between the first reinforcement unit 20 and the second reinforcement unit 30 can be determined by utilizing the first lower vertical reinforcement bar 41a and the second lower vertical reinforcement bar 41b of the already-placed lower reinforcing bars 41. Therefore, a jig for determining the spacing between the first reinforcement unit 20 and the second reinforcement unit 30 becomes unnecessary.
[0055] Furthermore, multiple lower reinforcing bars 41 are connected by lower connecting bars 50. This prevents the multiple lower reinforcing bars 41 from separating, making them easier to handle. Also, since the multiple lower reinforcing bars 41 are self-supporting when placed, no jig is needed to support them.
[0056] [Effects of this embodiment] The effects of this embodiment will now be explained. (1) When viewed from the first direction X, the multiple first main reinforcements 21 and the multiple second main reinforcements 31 are surrounded by the reinforcing bars 40, thereby improving the ductility of the foundation 10.
[0057] Furthermore, the reinforcing bar 40 is composed of a lower reinforcing bar 41 and an upper reinforcing bar 42. That is, the reinforcing bar 40 is divided in the vertical Z direction. In this case, by arranging the multiple lower reinforcing bars 41, the first reinforcement unit 20 and the second reinforcement unit 30, and the multiple upper reinforcing bars 42 in that order, the reinforcing bar 40 can surround the multiple first main reinforcements 21 and the multiple second main reinforcements 31, resulting in good workability.
[0058] Furthermore, multiple lower reinforcing bars 41 are connected by lower connecting bars 50. This prevents the multiple lower reinforcing bars 41 from separating, making them easier to handle. Also, since the multiple lower reinforcing bars 41 are self-supporting when placed, jigs to support the lower reinforcing bars 41 are unnecessary.
[0059] (2) The lower reinforcing bars 41 are arranged such that, when viewed from the first direction X, the first lower longitudinal bar 41a overlaps with the first rib bar 22 and the second lower longitudinal bar 41b overlaps with the second rib bar 32. The upper reinforcing bars 42 are arranged such that, when viewed from the first direction X, the first upper longitudinal bar 42a overlaps with the first rib bar 22 and the second upper longitudinal bar 42b overlaps with the second rib bar 32.
[0060] In this configuration, the spacing between the first reinforcement unit 20 and the second reinforcement unit 30 is determined by the first lower longitudinal reinforcement bar 41a and the second lower longitudinal reinforcement bar 41b of the lower reinforcing bar 41. Therefore, a jig is not required to determine the spacing between the first reinforcement unit 20 and the second reinforcement unit 30.
[0061] (3) The lower reinforcing bars 41 are arranged such that the first lower longitudinal bar 41a follows the first rib muscle 22 and the second lower longitudinal bar 41b follows the second rib muscle 32. The upper reinforcing bars 42 are arranged such that the first upper longitudinal bar 42a follows the first rib muscle 22 and the second upper longitudinal bar 42b follows the second rib muscle 32.
[0062] This configuration also provides the above-mentioned effect (2). Furthermore, it facilitates the tying work between the first lower longitudinal bar 41a and the first stirrup 22, between the second lower longitudinal bar 41b and the second stirrup 32, between the first upper longitudinal bar 42a and the first stirrup 22, and between the second upper longitudinal bar 42b and the second stirrup 32.
[0063] (4) The construction method for the reinforcement structure of the foundation 10 includes a first placement step, a second placement step, and a third placement step. The first placement step is the step of placing a plurality of lower reinforcing bars 41 connected by lower connecting bars 50. The second placement step is the step of placing the first reinforcement unit 20 and the second reinforcement unit 30 so as to extend parallel to each other with space between them. The third placement step is the step of placing a plurality of upper reinforcing bars 42.
[0064] According to this method, the reinforcing bars 40 can surround multiple first main reinforcements 21 and multiple second main reinforcements 31 without passing the first reinforcement unit 20 and the second reinforcement unit 30 through the reinforcing bars 40, resulting in good workability.
[0065] (5) In areas of the foundation 10 where many structural columns are provided, the bending moment in the vertical Z direction acting on the foundation 10 is larger compared to other areas. For this reason, areas of the foundation 10 where many structural columns are provided require higher ductility than other areas. Consequently, if the ductility of areas of the foundation 10 where many structural columns are provided is insufficient, the arrangement of structural columns was restricted, such as by distributing the structural columns. In this embodiment, a reinforcement structure for the foundation 10 with high ductility is used in areas of the foundation 10 where many structural columns are provided, so the necessary ductility can be secured. Consequently, the degree of freedom in the arrangement of structural columns is increased.
[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 longitudinal reinforcement 41a and the first upper longitudinal reinforcement 42a are each tied to the first stirrup 22. In this case, the amount of overlap between the first lower longitudinal reinforcement 41a or the first upper longitudinal reinforcement 42a and the first stirrup 22 required to secure the desired shear strength is less than the amount of overlap between the first lower longitudinal reinforcement 41a and the first upper longitudinal reinforcement 42a when the first lower longitudinal reinforcement 41a and the first upper longitudinal reinforcement 42a are tied together. Therefore, the lengths of the first lower longitudinal reinforcement 41a and the first upper longitudinal reinforcement 42a can be shortened.
[0068] Similarly, the second lower longitudinal reinforcement 41b and the second upper longitudinal reinforcement 42b are each tied to the second stirrup 32. In this case, the amount of overlap between the second lower longitudinal reinforcement 41b or the second upper longitudinal reinforcement 42b and the second stirrup 32 required to secure the desired shear strength is less than the amount of overlap between the second lower longitudinal reinforcement 41b and the second upper longitudinal reinforcement 42b when the second lower longitudinal reinforcement 41b and the second upper longitudinal reinforcement 42b are tied together. Therefore, the lengths of the second lower longitudinal reinforcement 41b and the second upper longitudinal reinforcement 42b can be shortened.
[0069] <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.
[0070] 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 lower longitudinal bar 41a of the lower reinforcing bar 41 does not need to overlap with the first rib bar 22 when viewed from the first direction X. The second lower longitudinal bar 41b of the lower reinforcing bar 41 does not need to overlap with the second rib bar 32 when viewed from the first direction X.
[0071] Similarly, the first upper longitudinal bar 42a of the upper reinforcing bar 42 does not have to overlap with the first rib bar 22 when viewed from the first direction X. The second upper longitudinal bar 42b of the upper reinforcing bar 42 does not have to overlap with the second rib bar 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 longitudinal bar 41a of the lower reinforcing bar 41 does not have to be positioned along the first rib bar 22. The second lower longitudinal bar 41b of the lower reinforcing bar 41 does not have to be positioned along the second rib bar 32.
[0073] Similarly, the first upper longitudinal reinforcement 42a of the upper reinforcing bar 42 does not have to be positioned along the first rib 22. The second upper longitudinal reinforcement 42b of the upper reinforcing bar 42 does not have to be positioned along the second rib 32.
[0074] For example, the first lower longitudinal bar 41a of the lower reinforcing bar 41 and the first upper longitudinal bar 42a of the upper reinforcing bar 42 may be tied together, and the second lower longitudinal bar 41b of the lower reinforcing bar 41 and the second upper longitudinal bar 42b of the upper reinforcing bar 42 may be tied 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. There may be one or three or more lower connecting bars 50. The position of the lower connecting reinforcement bar 50 in the second direction Y may be changed as appropriate. The lower connecting reinforcement bar 50 does not have to be located below the first main reinforcement bar 21 or the second main reinforcement bar 31.
[0076] As shown in Figure 7, multiple upper reinforcing bars 42 may be connected by upper connecting bars 60. In this case, the multiple upper reinforcing bars 42 do not separate, making them easier to handle. In the example shown in Figure 7, there are two upper connecting bars 60, but there may be one upper connecting bar 60 or three or more.
[0077] <Note> This specification discloses the following technologies: [Note 1] A foundation reinforcement structure comprising a first reinforcement unit and a second reinforcement unit extending parallel to each other at intervals, wherein 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 stirrups connecting the plurality of second main reinforcements vertically and spaced apart vertically, wherein the plurality of first main reinforcements are located on the second reinforcement unit side of the plurality of first stirrups in the second direction, and the plurality of second main reinforcements are located on the second direction A foundation reinforcement structure comprising: a plurality of reinforcing bars located on the first reinforcement unit side of a plurality of second stirrups, spaced apart in the first direction, and surrounding a plurality of first main reinforcements and a plurality of second main reinforcements when viewed from the first direction, wherein the reinforcing bars are composed of lower reinforcing bars and upper reinforcing bars, the lower reinforcing bars having a first lower longitudinal bar and a second lower longitudinal bar extending vertically on both sides of the first main reinforcement and the second main reinforcement, and a lower transverse bar connecting the first lower longitudinal bar and the second lower longitudinal bar on the lower side of the first reinforcement unit and the second reinforcement unit, the upper reinforcing bars having a first upper longitudinal bar and a second upper longitudinal bar extending vertically on both sides of the first main reinforcement and the second main reinforcement, and an upper transverse bar connecting the first upper longitudinal bar and the second upper longitudinal bar on the upper side of the first reinforcement unit and the second reinforcement unit, and the plurality of lower reinforcing bars are connected by lower connecting bars.
[0078] [Note 2] In the reinforcement structure of the foundation described in Appendix 1, the lower reinforcing bars are arranged such that, when viewed from the first direction, the first lower longitudinal bar overlaps with the first stirrup and the second lower longitudinal bar overlaps with the second stirrup, and the upper reinforcing bars are arranged such that, when viewed from the first direction, the first upper longitudinal bar overlaps with the first stirrup and the second upper longitudinal bar overlaps with the second stirrup.
[0079] [Note 3] In the reinforcement structure of the foundation described in Appendix 1, the lower reinforcing bars are arranged such that the first lower longitudinal bar follows the first stirrup and the second lower longitudinal bar follows the second stirrup, and the upper reinforcing bars are arranged such that the first upper longitudinal bar follows the first stirrup and the second upper longitudinal bar follows the second stirrup.
[0080] [Note 4] In the reinforcement structure of the foundation described in Appendix 1, the multiple upper reinforcing bars are connected by upper connecting bars.
[0081] [Note 5] A foundation comprising a reinforced concrete section having the reinforcement structure of any one of the foundations specified in Appendix 1 to 4.
[0082] [Note 6] A method for constructing a reinforced foundation structure as described in any one of the appendices 1 to 4, comprising: a first placement step of arranging a plurality of lower reinforcing bars connected by the lower connecting bars; a second placement step of arranging the first reinforcement unit and the second reinforcement unit so as to extend parallel to each other with spacing between them; and a third placement step of arranging a plurality of upper reinforcing bars. [Explanation of symbols]
[0083] 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, 41...Lower reinforcement bars, 41a...First lower vertical bars, 41b...Second lower vertical bars, 41c...Lower horizontal bars, 42...Upper reinforcement bars, 42a...First upper vertical bars, 42b...Second upper vertical bars, 42c...Upper horizontal bars, 50...Lower connecting bars, 60...Upper connecting bars, X...First direction, Y...Second direction, Z...Vertical 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 main reinforcements are located on the second reinforcement unit side of the plurality of first stirrups in the second direction. The plurality of the second main reinforcements are located on the first reinforcement unit side of the plurality of the second stirrups in the second direction. The reinforcing bars are arranged at intervals in the first direction and, when viewed from the first direction, surround the plurality of first main reinforcements and the plurality of second main reinforcements. The reinforcing bars are composed of lower reinforcing bars and upper reinforcing bars. The lower reinforcing bars include a first lower longitudinal bar and a second lower longitudinal bar extending vertically on both sides of the first main bar and the second main bar, and a lower transverse bar connecting the first lower longitudinal bar and the second lower longitudinal bar on the lower side of the first reinforcement unit and the second reinforcement unit. The upper reinforcing bars include a first upper longitudinal bar and a second upper longitudinal bar extending vertically on both sides of the first main bar and the second main bar, and an upper transverse bar connecting the first upper longitudinal bar and the second upper longitudinal bar on the upper side of the first reinforcement unit and the second reinforcement unit. A reinforcement structure of a foundation in which multiple lower reinforcing bars are connected by lower connecting bars.
2. The lower reinforcing bars are arranged such that, when viewed from the first direction, the first lower longitudinal bar overlaps with the first rib muscle, and the second lower longitudinal bar overlaps with the second rib muscle. The reinforcement structure for a foundation according to claim 1, wherein the upper reinforcing bars are arranged such that, when viewed from the first direction, the first upper longitudinal bars overlap with the first stirrups and the second upper longitudinal bars overlap with the second stirrups.
3. The lower reinforcing bars are arranged such that the first lower longitudinal bar follows the first rib and the second lower longitudinal bar follows the second rib. The reinforcement structure for a foundation according to claim 1, wherein the upper reinforcing bars are arranged such that the first upper longitudinal bar follows the first stirrup and the second upper longitudinal bar follows the second stirrup.
4. The reinforcement structure for a foundation according to claim 1, wherein the multiple upper reinforcing bars are connected by upper connecting bars.
5. A reinforcing bar section having the reinforcement structure of the foundation as described in any one of claims 1 to 4, Concrete section, A foundation equipped with these features.
6. A method for constructing a reinforced concrete foundation structure according to any one of claims 1 to 4, A first arrangement step involves arranging a plurality of lower reinforcing bars connected by the lower connecting bars, A second 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 third arrangement step involves arranging multiple upper reinforcing bars, Construction method for the reinforced concrete structure of the foundation, including [specific component].
Citation Information
Patent Citations
Double reinforcing bar arrangement structure of reinforced concrete base beam
JP2017078254A