Anchor reinforcement and concrete foundation

Abstract

To obtain a reinforcing bar for an anchor portion and a concrete foundation that can prevent exfoliation of concrete around an anchor portion consisting of an anchor hole or an anchor bolt, and can ensure both strength and durability of the foundation.SOLUTION: An anchor portion reinforcing bar 44 includes an exfoliation prevention bar 50 that is integrally formed by partially welding a pair of reinforcement materials 52. The exfoliation prevention bar 50 has an overlapping portion 58 between the welded reinforcement materials, and a pair of exfoliation prevention portions 54 arranged on both sides of a rising portion 14 in a thickness direction with an anchor hole 42 therebetween. Further, the overlapping portions are arranged on both sides of the rising portion 14 in a foundation longitudinal direction with the anchor hole 42 interposed therebetween, and have a welded portion Y below the pair of exfoliation prevention portions 54.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present invention relates to a reinforcing bar for an anchor and a concrete foundation. [Background technology]

[0002] Anchor bolts have traditionally been used to secure building structural materials to reinforced concrete foundations. For example, anchor holes (sheath pipes) are buried so that they open at the top of the rising part of the foundation, and anchor bolts connected to the lower ends of the building structural materials are inserted into the sheath pipes filled with grout. In this way, the building structural materials can be secured to the reinforced concrete foundation using the anchor bolts.

[0003] Here, when an earthquake occurs, there is a risk that vibrations transmitted from the structural materials of the building via the anchor bolts will cause the corners in the thickness direction of the rising portion in which the anchor holes are embedded to peel off.

[0004] As a measure to prevent such peeling, Patent Document 1 proposes a technology in which anchor reinforcement bars are arranged around the anchor holes. These anchor reinforcement bars have anti-peeling bars made up of pairs of joined reinforcing bars. The anti-peeling bars have a pair of anti-peeling parts arranged on either side of the anchor hole in the thickness direction of the rising part, and the pair of anti-peeling parts prevents peeling at the corners on both sides of the rising part in the thickness direction. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2011-190590

[0006] Incidentally, when using anti-stripping reinforcement bars such as those described in Patent Document 1, it is desirable to join the reinforcement bars together by welding in order to ensure the strength of the foundation.

[0007] However, in the anti-spare reinforcement bar disclosed in Patent Document 1, the upper ends of a pair of reinforcing bars are connected using metal connectors. A pair of anti-spare sections is provided at the upper ends of the reinforcing bars, and the pair of anti-spare sections is arranged at the top of the rising portion to prevent the corners of the rising portion from peeling off. Therefore, if the upper ends of the reinforcing bars are joined by welding instead of using metal connectors, the cover thickness in the vertical direction of the weld within the rising portion will be relatively small. As a result, the welds, which tend to oxidize, will be more susceptible to the effects of carbonation of the concrete, and it will be necessary to ensure durability at the same time. Summary of the Invention [Problem to be solved by the invention]

[0008] In consideration of the above, the present invention aims to provide a reinforcing bar for an anchor part and a concrete foundation that can prevent spalling of concrete around an anchor part consisting of an anchor hole and an anchor bolt, and can ensure both the strength and durability of the foundation. [Means for solving the problem]

[0009] The anchor reinforcement bar of the first aspect is applied to the rising portion of a reinforced concrete foundation and reinforces the anchor portion exposed on the top end side of the rising portion, and is equipped with a peeling prevention bar formed by partially welding together a pair of reinforcing bars, and the peeling prevention bar has an overlapping portion where the welded reinforcing bars are welded together, and a pair of peeling prevention portions arranged on both sides of the rising portion in the thickness direction, sandwiching the anchor portion between them, and the overlapping portions are arranged on both sides of the rising portion in the longitudinal direction of the foundation, sandwiching the anchor portion between them, and have welded portions below the pair of peeling prevention portions.

[0010] According to a first aspect, the anchor reinforcement bar includes a peeling prevention bar formed by partially welding a pair of reinforcing bars together. This peeling prevention bar has an overlapping portion between the welded reinforcing bars and a pair of peeling prevention portions arranged on both sides of the anchor portion in the thickness direction of the rising portion. This allows the pair of peeling prevention portions to prevent peeling at the corners on both sides of the rising portion in the thickness direction. Furthermore, because the pair of reinforcing bars are integrated by welding, the joint strength between the reinforcing bars is increased, ensuring the strength of the foundation.

[0011] Furthermore, the overlapping portions of the welded reinforcing bars are located on both sides of the rising portion in the longitudinal direction of the foundation, sandwiching the anchor portion, and the welds are located below the pair of spalling prevention portions. This ensures sufficient cover thickness in the height direction of the rising portion at the welds, effectively suppressing corrosion at the welds. As a result, the durability of the foundation can be ensured even if the cover thickness of the pair of spalling prevention portions is relatively small.

[0012] The anchor reinforcement bar of the second aspect has the configuration described in the first aspect, and the overlapping portion has the welded portion located further inward in the thickness direction of the rising portion than the pair of anti-peeling portions.

[0013] According to the second aspect, the overlapping portion of the reinforcing bars has a welded portion located inside the rising portion in the thickness direction of the peeling prevention portion, which allows the covering thickness of the rising portion in the welded portion in the thickness direction to be set larger than the covering thickness of the peeling prevention portion in the thickness direction, thereby further improving the corrosion prevention effect of the welded portion.

[0014] The anchor reinforcement bar of the third aspect is configured as described in the first or second aspect, in which the overlapping portion is positioned so as to overlap with the anchor portion when viewed from the base longitudinal direction of the rising portion.

[0015] According to the third aspect, the overlapping portion of the reinforcing bars to be welded is positioned so as to overlap the anchor portion when viewed from the longitudinal direction of the foundation of the rising portion. This allows the anchor portion and the anchor reinforcing bar to be positioned relative to each other using the overlapping portion as a reference, making positioning easy. Furthermore, when the thickness of the rising portion is set around the anchor portion, the cover thickness at the welded portion can be made uniform on both sides of the rising portion in the thickness direction, thereby uniformly enhancing the corrosion prevention effect on both sides of the rising portion.

[0016] The anchor reinforcement bar of the fourth aspect is configured as described in any one of the first to third aspects, wherein the anti-peeling bar has an abutment portion that is arranged below the overlapping portion and abuts against the upper side of the main reinforcement that is arranged in the rising portion and extends in the longitudinal direction of the foundation, thereby determining the height position of the anti-peeling bar within the rising portion, and the abutment portion is formed integrally with the anti-peeling bar by bending the lower side of the overlapping portion of at least one of the pairs of reinforcement bars.

[0017] According to the fourth aspect, the height position of the anchor reinforcement bar relative to the main reinforcement bars can be determined by abutment portions provided below the overlapping portion, separate from the pair of peeling prevention portions. Therefore, the height position of the pair of peeling prevention portions can be freely set regardless of the position of the main reinforcement bars. Furthermore, the abutment portions are formed integrally with the peeling prevention bars by bending the lower side of the overlapping portion of at least one of the pair of reinforcement bars. This reduces the number of welds formed on the peeling prevention bars, thereby further improving the durability of the foundation, compared to a configuration in which abutment portions are formed by welding reinforcement bars made of different materials to the peeling prevention bars. Furthermore, the manufacturing process for the anchor reinforcement bars can be reduced.

[0018] The anchor section reinforcing bar of the fifth aspect has the configuration described in the fourth aspect, in which the anti-peeling bar is arranged on the opposite side of the anti-peeling bar from the anti-peeling bar in the thickness direction, sandwiching the anchor section therebetween, and has a vertical section extending downward beyond the anti-peeling bar and the overlapping section, and at least one of the pairs of reinforcing bars is bent so as to have a first bend connecting the anti-peeling bar to the upper end of the overlapping section, a second bend connecting the lower end of the overlapping section to the abutting section, and a third bend connecting the abutting section to the upper end of the vertical section, and the anti-peeling bar, the overlapping section, the abutting section, and the vertical section are integrally formed.

[0019] According to the fifth aspect, the peeling prevention portion, overlapping portion, abutting portion, and vertical portion can be easily formed by bending a single reinforcing bar, which facilitates the manufacture of the anchor reinforcing bar. In addition, in this case, by making the configuration of the pair of reinforcing bars symmetrical on both sides of the thickness direction of the rising portion, there is no functional difference regardless of which side the pair of peeling prevention portions are positioned on, which prevents mistakes in the assembly direction of the anchor reinforcing bar.

[0020] The anchor reinforcement bar according to the sixth aspect has the same configuration as the fifth aspect, in which the vertical portion is positioned further inward in the thickness direction of the rising portion than the pair of anti-peeling portions.

[0021] According to the sixth aspect, the vertical portion extending downward from the overlapping portion is positioned further inward in the thickness direction of the rising portion than the pair of peeling prevention portions. As a result, the cover thickness of the rising portion in the thickness direction of the vertical portion is set to be greater than the cover thickness of the peeling prevention portions in the thickness direction. As a result, even if the width between the pair of peeling prevention portions is widened to enhance the peeling prevention effect, the cover thickness of the vertical portion can be sufficiently ensured, thereby enhancing the peeling prevention effect and ensuring the durability of the foundation.

[0022] The concrete foundation according to the seventh aspect comprises a reinforced concrete rising portion, an anchor portion exposed at the top end of the rising portion, and a reinforcing bar for the anchor portion as described in any one of claims 1 to 6 that is embedded within the rising portion while being engaged with the main reinforcement bars and reinforces the anchor portion.

[0023] As described above, the concrete foundation according to the seventh aspect can prevent concrete from spalling around the anchor portion consisting of the anchor hole and anchor bolt, while ensuring both the strength and durability of the foundation. [Effects of the Invention]

[0024] As described above, the anchor reinforcing bars and concrete foundations according to the above-mentioned aspects have the excellent effect of preventing concrete spalling around the anchors consisting of anchor holes and anchor bolts, and ensuring both the strength and durability of the foundation. [Brief explanation of the drawings]

[0025] [Figure 1] FIG. 2 is a cross-sectional view showing the cross-sectional structure of the concrete foundation according to the embodiment. [Figure 2] FIG. 1 is a perspective view showing a backbone structure of a concrete foundation according to an embodiment. [Figure 3] FIG. 2 is a perspective view showing the configuration of an anchor portion reinforcing bar according to the embodiment. [Figure 4] (A) is a plan view of the anchor reinforcement bar as seen from direction A in Figure 3, (B) is a side view of the anchor reinforcement bar as seen from direction B in Figure 3, and (C) is a side view of the anchor reinforcement bar as seen from direction C in Figure 3. [Figure 5] FIG. 10 is a cross-sectional view showing the installation state of anchor reinforcement bars in the rising portion. [Figure 6] FIG. 6 is a cross-sectional view corresponding to FIG. 5, showing a first modified example of an anchor portion reinforcing bar. [Figure 7]FIG. 6 is a cross-sectional view corresponding to FIG. 5, showing a second modified example of the anchor portion reinforcing bar. [Figure 8] FIG. 6 is a cross-sectional view corresponding to FIG. 5, showing a third modified example of the anchor portion reinforcing bar. DETAILED DESCRIPTION OF THE INVENTION

[0026] Hereinafter, a concrete foundation 10 to which an anchor reinforcing bar 44 according to this embodiment is applied will be described with reference to FIGS.

[0027] As shown in Figures 1 and 2, the concrete foundation 10 (hereinafter simply referred to as "foundation 10") is constructed as a reinforced concrete foundation used for buildings such as houses, and as an example, is a continuous footing.

[0028] The foundation 10 has a footing 12 buried in the ground and a rising portion 14 extending upward from the footing 12 and exposed above ground. Crushed stone 16 is laid below the footing 12. Foundation reinforcement is arranged inside the foundation 10. The reinforcement structure in this embodiment is single reinforcement.

[0029] The foundation reinforcement is composed of a base reinforcement section 20 that is installed approximately horizontally in the footing portion, and a rising reinforcement section 30 that is connected to the base reinforcement section 20 in a state where it is raised approximately vertically.

[0030] The base reinforcement section 20 includes a pair of base reinforcing bars 22 extending parallel to the longitudinal direction of the foundation 10, and a plurality of base reinforcements 24 extending in the width direction of the foundation 10 and fixed by welding or the like to the pair of base reinforcing bars 22. A plurality of base reinforcements 24 are provided at predetermined intervals in the longitudinal direction of the foundation 10. The base reinforcing bars 22 and the base reinforcements 24 are made of deformed steel bars that are generally used in continuous footings.

[0031] The rising reinforcement section 30 includes upper end main reinforcements 32, web reinforcements 34, and lower end main reinforcements 36 as horizontal reinforcements extending in the longitudinal direction of the foundation 10, and stirrups 38 as vertical reinforcements. Specifically, the upper end main reinforcements 32 are arranged parallel to each other at the upper end of the rising reinforcement section 30, the lower end main reinforcements 36 are arranged parallel to each other at the lower end, and the web reinforcements 34 are arranged approximately in the middle of them. The upper end main reinforcements 32, web reinforcements 34, and lower end main reinforcements 36 are fixed to the stirrups 38 by welding or the like, thereby maintaining the spacing between the reinforcement members. A plurality of stirrups 38 are formed at predetermined intervals in the longitudinal direction of the foundation 10. The base reinforcements 24 and the stirrups 38 are installed at approximately the same intervals. The upper end main reinforcements 32, web reinforcements 34, lower end main reinforcements 36, and stirrups 38 are made of deformed steel bars generally used in continuous footings.

[0032] The rising reinforcement section 30 is provided with the lower end main reinforcement 36 placed on the base reinforcement 24 of the base reinforcement section 20.

[0033] Additionally, anchor holes 42 are embedded in the rising portion 14 of the foundation 10, into which anchor bolts 40 are inserted for fixing the structural materials of the building onto the foundation 10. Furthermore, anchor reinforcing bars 44 for reinforcing the anchor holes 42 are embedded in the rising portion 14. The above-mentioned upper end main bars 21 correspond to the "main bars" in this invention, and the anchor holes 42 correspond to the "anchor portions." The configuration of the anchor reinforcing bars 44 will be described in detail below.

[0034] The anchor bolt 40 is connected to the lower end of a structural member of a building, such as a beam or a column. In this embodiment, as an example, the anchor bolt 40 is connected to a floor girder 46 of a building unit that makes up a unit building, and the anchor bolt 40 is provided so as to protrude downward from the lower end (bottom flange of the channel steel) of the floor girder 46. The anchor hole 42 is made up of a so-called sheath pipe, and is provided so as to open at the top end of the rising portion 14 of the foundation 10.

[0035] When installing a building unit on foundation 10, anchor holes 42 are filled with a filler (grout) such as mortar, and anchor bolts 40 that protrude downward from floor girders 46 (the lower ends of the building units) are inserted into anchor holes 42. After that, as the filler hardens, anchor bolts 40 are firmly fixed to foundation 10, thereby fixing the building unit onto foundation 10. In Figure 1, floor girders 46 are installed with their grooves facing toward the inside of the building, with the right side of the figure being the inside of the building.

[0036] As shown in Figures 3 and 4, the anchor reinforcement 44 is formed into a three-dimensional shape by combining two pairs of reinforcing bars, and is arranged within the rising portion 14 so as to surround the anchor hole 42.

[0037] In the following description, it is assumed that the anchor reinforcement bar 44 is installed in the foundation, and the horizontal direction in this state is referred to as the horizontal direction, and the vertical direction is referred to as the vertical direction.

[0038] The anchor reinforcement bars 44 have anti-peeling bars 50. The anti-peeling bars 50 have the same basic configuration and are formed by partially welding a pair of reinforcing bars (reinforcing bars) 52 together. Each reinforcing bar 52 has a anti-peeling portion 54, a horizontal portion 56, and an abutting portion 60 that extend horizontally, and an overlapping portion 58 and a vertical portion 62 that extend vertically. Note that the extension direction of each component of the reinforcing bar 52 is not limited to directions parallel to the horizontal or vertical direction, but also includes directions slightly tilted relative to each direction.

[0039] In each reinforcing bar material 52, a peeling prevention portion 54 is provided at the upper end of the reinforcing bar material 52. The peeling prevention portion 54 extends along the foundation longitudinal direction of the rising portion 14, and a pair of horizontal portions 56 are formed at both ends thereof. A first bending point P1 is formed at the end of the pair of horizontal portions 56 (the end opposite the peeling prevention portion 54), and the first bending point P1 is connected to the upper end of the overlapping portion extending downward. A second bending point P2 is formed at the lower end of the overlapping portion 58, and the second bending point P2 is connected to a contact portion 60 provided below the overlapping portion 58. A third bending point P3 is further formed at the end of the contact portion 60 (the end opposite the overlapping portion 58), and a vertical portion 62 is provided that extends below the peeling prevention portion 54 and the overlapping portion 58.

[0040] In this embodiment, the peeling prevention portion 54 and the horizontal portion 56 are formed in a state where they are bent vertically in a horizontal plane, and the horizontal portion 56 and the overlapping portion 58 are formed in a state where they are bent vertically in a vertical plane at a first bending point P1. The overlapping portion 58 and the abutting portion 60 are formed in a state where they are bent vertically in a vertical plane at a second bending point P2. The abutting portion 60 and the vertical portion 62 are formed in a state where they are bent vertically in a vertical plane at a third bending point P3.

[0041] In other words, the reinforcing bar material 52 is bent in a crank shape within a vertical plane between the peeling prevention portion 54 and the vertical portion 62 to form the horizontal portion 56, overlapping portion 58, and abutting portion 60. A pair of reinforcing bar materials 52 are combined in opposite orientations with the overlapping portions 58 overlapping each other, forming a three-dimensional peeling prevention bar 50.

[0042] 4C, in the peeling prevention bar 50, the pair of peeling prevention portions 54 and the pair of horizontal portions 56 are present in the same horizontal plane and are surrounded by them to form an upper opening K. This upper opening K is substantially square, and the anchor hole 42 is inserted through this upper opening K and arranged.

[0043] As shown in Figure 5, when the anchor reinforcement bars 44 are embedded, the overlapping portions 58 of each reinforcing bar 52 are positioned so as to overlap with the anchor holes 42 when viewed from the base longitudinal direction of the rising portion 14. As an example, the anchor holes 42 are positioned at the center in the thickness direction of the rising portion 14. By arranging the overlapping portions 58 to match the positions of the anchor holes 42, the anchor reinforcement bars 44 can be easily positioned relative to the anchor holes 42.

[0044] In this state, a pair of peeling prevention portions 54 are arranged on both sides of the rising portion 14 in the thickness direction, sandwiching the anchor hole 42. In addition, a pair of overlapping portions 58 are arranged on both sides of the rising portion 14 in the base longitudinal direction, sandwiching the anchor hole 42.

[0045] Here, the overlapping portions 58 of each reinforcing bar material 52 are arranged side by side in the horizontal direction (i.e., at overlapping positions when viewed from the longitudinal direction of the foundation), and the overlapping portions 58 are joined together by welding. The welded portion Y that joins the overlapping portions 58 together is provided on the lower end side of the overlapping portions 58, and is therefore arranged below the pair of peeling prevention portions 54 and inside the rising portion 14 in the thickness direction.

[0046] As a result, the cover thickness in the height direction of the rising portion 14 at the welded portion Y between the reinforcing bars 52 is set to be larger than the cover thickness at the peeling prevention portion 54. The cover thickness in the thickness direction of the rising portion 14 at the welded portion Y is also set to be larger than the cover thickness at the peeling prevention portion 54. In FIG. 5, the cover thickness in the thickness direction at the welded portion Y is indicated by the symbol "L1", and the cover thickness in the height direction is indicated by the symbol "L2".

[0047] Furthermore, the vertical portion 62 of each reinforcing bar 52 is positioned on the opposite side of the anchor hole 42 from the peeling prevention portion 54. In this embodiment, the peeling prevention portion 54 of one reinforcing bar 52 and the vertical portion 62 of the other reinforcing bar are positioned at the same position in the thickness direction of the rising portion 14. Therefore, in the anchor reinforcing bar 44, the peeling prevention portion 54 and the vertical portion 62 have the same cover thickness in the thickness direction.

[0048] The upper end main reinforcement 32 is arranged at a position slightly offset outward (toward the exterior) from the center position in the thickness direction of the rising portion 14. One of the reinforcing bars 52, arranged near this upper end main reinforcement 32, abuts against the upper side of the upper end main reinforcement 32, with each of a pair of abutting portions 60 spanning between the lower end of the overlapping portion 58 and the upper end of the vertical portion 62 of the reinforcing bar 52. As a result, the anchor reinforcing bars 44 are locked to the upper end main reinforcement 32 via the abutting portions 60. The abutting portions also determine the height position of the peeling prevention bars 50 within the rising portion 14.

[0049] Here, when an earthquake occurs, vibrations are transmitted from the structural members of the building through the anchor bolts 40. Due to the horizontal force, there is a risk that the corners in the thickness direction of the rising portion 14 in which the anchor holes 42 are embedded will peel off. That is, as shown in Figure 5, in the rising portion 14 of the foundation 10, the outer and inner corners are more susceptible to peeling, starting from the opening of the anchor hole 42 at the top end of the rising portion 14. More specifically, the part that starts from the anchor bolt 40 inserted into the anchor hole 42 and spreads out at a predetermined oblique angle (for example, about 45°) is the peeling point H, which is at risk of peeling. The peeling point H exists on both the outdoor side and the indoor side of the rising portion 14.

[0050] In contrast, according to the foundation 10 of this embodiment, a pair of anti-peeling portions 54 are arranged on both sides of the rising portion 14 in the thickness direction of the rising portion 14, sandwiching the anchor hole 42. In this case, the anti-peeling portions 54 are present within the regions of both the outer and inner peeling points H, respectively, and this makes it possible to prevent peeling from occurring at both of these peeling points H. In particular, in this embodiment, the entirety of each anti-peeling portion 54 is arranged within the region of the peeling point H, further enhancing the anti-peeling effect.

[0051] (Actions and Effects) As described above, the anchor reinforcement bar 44 according to this embodiment includes a peeling prevention bar 50 formed by partially welding a pair of reinforcing bars (reinforcing bars) 52 together. This peeling prevention bar 50 has an overlapping portion 58 where the welded reinforcing bars 52 overlap, and a pair of peeling prevention portions 54 that are arranged on either side of the anchor hole 42 in the thickness direction of the rising portion 14.

[0052] According to this configuration, the pair of anti-peeling portions 54 can prevent peeling of the corners on both sides in the thickness direction of the rising portion 14. Furthermore, since the pair of reinforcing bars 52 are integrated by welding, the joint strength between the reinforcing bars is increased, ensuring the strength of the foundation.

[0053] Here, overlapping portions 58 of the reinforcing bars 52 to be welded are arranged on either side of the rising portion in the longitudinal direction of the foundation, sandwiching the anchor hole 42, with the welded portion Y located below the pair of spalling prevention portions 54. This ensures a sufficient cover thickness (L1) in the height direction of the rising portion 14 at the welded portion Y, effectively suppressing corrosion of the welded portion Y. As a result, even if the cover thickness at the pair of spalling prevention portions 54 is relatively small, the durability of the foundation can be ensured.

[0054] The overlapping portion 58 between the reinforcing bars 52 has the welded portion Y located inside the thickness direction of the rising portion 14 relative to the peeling prevention portion 54. This allows the covering thickness of the welded portion Y in the thickness direction of the rising portion 14 to be set larger than the covering thickness of the peeling prevention portion 54 in the thickness direction, thereby further enhancing the corrosion prevention effect of the welded portion Y.

[0055] The overlapping portion 58 between the reinforcing bars 52 to be welded is positioned so as to overlap the anchor hole 42 when viewed from the base longitudinal direction of the rising portion 14. This makes it possible to align the anchor hole 42 and the anchor reinforcing bar 44 relative to each other using the overlapping portion 58 as a reference, making positioning easy. Furthermore, when the thickness of the rising portion 14 is set with the anchor hole 42 as the center, the cover thickness at the welded portion Y can be made uniform on both sides of the rising portion 14 in the thickness direction, thereby making it possible to uniformly enhance the corrosion prevention effect on both sides of the rising portion 14.

[0056] The height position of the anchor reinforcement bars 44 relative to the upper end main reinforcements (main reinforcements) 32 can be determined by the abutment parts 60 provided below the overlapping parts 58, separate from the pair of peeling prevention parts 54. Therefore, the height positions of the pair of peeling prevention parts 54 can be freely set regardless of the position of the upper end main reinforcements 32.

[0057] Furthermore, the abutment portion 60 is formed integrally with the peeling prevention bar 50 by bending the lower side of the overlap portion 58 of at least one of the pairs of reinforcing bars 52. This reduces the number of welds formed in the peeling prevention bar 50 compared to a configuration in which the abutment portion is formed by welding a reinforcing bar made of a different material to the peeling prevention bar, thereby further increasing the durability of the foundation 10. Furthermore, the manufacturing process for the anchor reinforcement bar 44 can be reduced.

[0058] In the peeling prevention bar 50, the peeling prevention portion 54, overlapping portion 58, contact portion 60, and vertical portion 62 can be easily formed by bending a single reinforcing bar 52, which facilitates the manufacture of the anchor part reinforcement bar 44. In this case, by making the configuration of the pair of reinforcing bars 52 symmetrical on both sides in the thickness direction of the rising portion 14, there is no functional difference regardless of which side the pair of peeling prevention portions 54 are positioned on, which prevents mistakes in the assembly direction of the anchor part reinforcement bar 44.

[0059] Although one example of an embodiment has been described above, the present invention is not limited to this. The anchor part reinforcing bar may be implemented in the form of the first to third modified examples described below. In each modified example, the same components as those in the above embodiment are assigned the same numbers and their description will be omitted.

[0060] (First Modification) 6 shows the installation state of anchor part reinforcement bars 70 according to a first modification in the rising portion 14. As shown in this figure, anchor part reinforcement bars 70 according to the first modification are characterized in that the vertical portions 62 are offset inward in the thickness direction of the rising portion 14 from the pair of peeling prevention portions 54. The other configurations are the same as those of the above embodiment.

[0061] According to this configuration, the cover thickness in the thickness direction of the rising portion 14 in the vertical portion 62 is set to be larger than the cover thickness in the thickness direction of the spalling prevention portion 54. As a result, in the upper portion of the spalling prevention bar 50 where there is a concern of concrete spalling, the width (spacing) between the pair of spalling prevention portions 54 can be widened to improve the spalling prevention function, and in the lower portion of the spalling prevention bar 50, sufficient cover thickness of the vertical portion can be ensured to improve the durability of the foundation.

[0062] (Second Modification) Fig. 7 shows the installation state of anchor part reinforcement bars 80 according to a second modification in the rising portion 14. As shown in this figure, anchor part reinforcement bars 80 according to the second modification are characterized in that the peeling prevention bars 81 are made up of a pair of reinforcing bars 82, 84 that are configured with different shapes. The other configurations are the same as those of the above embodiment.

[0063] The anchor reinforcement bar 80 includes a pair of first reinforcing bar materials 82 and second reinforcing bar materials 84, which are integrated by partially welding them together to form a peeling prevention bar 81. The first reinforcing bar materials 82 and second reinforcing bar materials 84 are each formed by bending a single reinforcing bar material.

[0064] The first reinforcing bar material 82 has the same configuration as the reinforcing bar material 52 according to the above embodiment, and has a peeling prevention portion 54, a horizontal portion 56, an overlapping portion 58, a contact portion 60, and a vertical portion 62. Detailed explanation of each component will be omitted.

[0065] The second reinforcing bar 84 has a spalling prevention portion 86, a horizontal portion 88, and a vertical portion 90. The spalling prevention portion 86 is a counterpart to the spalling prevention portion 54 of the first reinforcing bar 82, and is provided at the upper end of the second reinforcing bar 84. The spalling prevention portion 86 extends along the longitudinal direction of the foundation of the rising portion 14. A pair of horizontal portions 88 extend horizontally from both ends of the spalling prevention portion 86. A vertical portion 90 extending downward is formed by bending at the ends of the pair of horizontal portions 88 (the ends opposite the spalling prevention portions 86). The second reinforcing bar material 84 also serves as an "overlapping portion" where the upper part of the vertical portion 90 overlaps with the first reinforcing bar material 82, and the vertical portion 90 has a welding portion Y below the pair of anti-peeling portions 54, 86 and on the inside in the thickness direction, which welds the first reinforcing bar material 82 and the second reinforcing bar material 84 together.

[0066] In this embodiment, the peeling prevention portion 86 and horizontal portion 88 of the second reinforcing bar material 84 are formed in a state of being bent vertically in the same horizontal plane as the peeling prevention portion 54 of the first reinforcing bar material, and the horizontal portion 88 and vertical portion 90 are formed in a state of being bent vertically in a vertical plane. In this configuration, an upper opening K (not shown) having a substantially square shape is formed by being surrounded by the peeling prevention portion 54 and the pair of horizontal portions 56 of the first reinforcing bar material 82, and the peeling prevention portion 86 and the pair of horizontal portions 88 of the second reinforcing bar material 84. An anchor hole 42 is then inserted through the upper opening K.

[0067] In this embodiment, a pair of anti-peeling portions 86 of the second reinforcing bar material 84 is arranged inside a pair of anti-peeling portions 54 of the first reinforcing bar material 82, but this is not limited to this, and the inside-outside relationship may be reversed.

[0068] According to the anchor portion reinforcing bar 80 of this second modified example, when embedded in the rising portion 14, a pair of anti-peeling portions 54, 86 are arranged on both sides of the thickness of the rising portion 14, sandwiching the anchor hole 42. Furthermore, the welded portion Y that welds the first reinforcing bar material 82 and the second reinforcing bar material 84 together is provided below the pair of peeling prevention portions 54, 86 and on the inner side in the thickness direction of the rising portion 14. The contact portion 60 of the first reinforcing bar 82 contacts the upper end main bar 32, thereby determining the height position of the peeling prevention bar 81. Furthermore, overlapping portions 58, 90 of the first reinforcing bar material 82 and the second reinforcing bar material 84 are arranged at positions that overlap anchor holes 42 when viewed from the foundation longitudinal direction of the rising portion 14.

[0069] In this way, the anchor part reinforcement bar 80 basically follows the configuration of the anchor part reinforcement bar 44 according to the above embodiment, and therefore can obtain the same actions and effects. Furthermore, it is sufficient that at least one of the pair of reinforcing bars 82, 84 (first reinforcing bar 52) has the abutment portion 60, and in the above second modified example, the configuration of the second reinforcing bar 84 can be simpler than that of the first reinforcing bar 82.

[0070] (Third Modification) Fig. 8 shows the installation state of anchor part reinforcement bars 100 according to the third modified example in the rising section 14. As shown in this figure, the anchor part reinforcement bars 100 according to the third modified example are characterized in that, like the second modified example, the peeling prevention bars 101 are composed of a pair of reinforcing bars 110, 120 with different shapes. The other configurations are the same as those of the above embodiment.

[0071] The anchor reinforcement bar 100 includes a pair of first reinforcing bar materials 110 and second reinforcing bar materials 120, which are integrated by partially welding them together to form a peeling prevention bar 101. The first reinforcing bar materials 110 and second reinforcing bar materials 120 are each formed by bending a single reinforcing bar material.

[0072] The first reinforcing bar material 110 is formed by omitting the component corresponding to the horizontal portion 56 in the reinforcing bar material 52 according to the above embodiment. That is, the first reinforcing bar material 110 has a peeling prevention portion 111, an overlapping portion 112, a contact portion 113, and a vertical portion 114. The peeling prevention portion 111 is provided at the upper end of the first reinforcing bar material 110 and extends along the longitudinal direction of the foundation of the rising portion 14. A first bending point P1 is formed at each end of the peeling prevention portion 111, and a pair of overlapping portions 112 extending downward in the vertical direction are formed. A second bending point P2 is formed at the end portions of the pair of overlapping portions 112 (ends opposite the peeling prevention portion 111), and a contact portion 113 is formed that extends horizontally away from the peeling prevention portion 111. Furthermore, a third bending point P3 is formed at the end of the abutment portion 113 (the end opposite the overlapping portion 112) by bending, and a vertical portion 114 is provided that extends downward beyond the peeling prevention portion 111 and the overlapping portion 112.

[0073] In this embodiment, the peeling prevention portion 111 and the overlapping portion 112 of the first reinforcing bar material 110 are formed in a state where they are bent vertically in a vertical plane along the longitudinal direction of the foundation. The overlapping portion 112, the abutting portion 113, and the vertical portion 114 are also formed in a state where they are bent vertically in a vertical plane along the thickness direction of the foundation.

[0074] On the other hand, the second reinforcing bar material 120 has the same basic configuration as the second reinforcing bar material 84 according to the second modified example, and has a peeling prevention portion 121, a horizontal portion 122, and a vertical portion 124. In the third modified example, the second reinforcing bar material 120 differs in configuration from the second reinforcing bar material 84 according to the second modified example in that the length of the horizontal portion 122 of the second reinforcing bar material 120 is set to be equal to the distance between the pair of peeling prevention portions 111, 121 across the anchor hole 42, but the other configurations are the same. Therefore, a detailed description of each component of the second reinforcing bar material 120 will be omitted.

[0075] With this configuration, an upper opening K (not shown) having a substantially square shape is formed, surrounded by the peeling prevention portion 111 of the first reinforcing bar material 110, the peeling prevention portion 121 of the second reinforcing bar material 120, and the pair of horizontal portions 122. Then, an anchor hole 42 is inserted through the upper opening K and arranged.

[0076] In this embodiment, a pair of vertical portions 123 of the second reinforcing bar material 120 are arranged inside a pair of overlapping portions 112 of the first reinforcing bar material 110, but this is not limited to this, and the inside-outside relationship may be reversed.

[0077] According to the anchor portion reinforcing bar 100 of this third modified example, when embedded in the rising portion 14, a pair of anti-peeling portions 111, 121 are arranged on both sides of the thickness of the rising portion 14, sandwiching the anchor hole 42. Additionally, the overlapping portion 112 of the first reinforcing bar material 110 and the vertical portion (overlapping portion) 123 of the second reinforcing bar material 120 are overlapped and welded together. A welded portion Y that welds the first reinforcing bar material 110 and the second reinforcing bar material 120 together is provided below the pair of peeling prevention portions 111, 121. Furthermore, the welded portion Y is offset to one side in the thickness direction of the rising portion from the anchor hole 42, and is located at the same position as the peeling prevention portion 111 of the first reinforcing bar material 110 in the foundation thickness direction.

[0078] In this configuration, in the welded portion Y, the covering thickness of the rising portion 14 in the thickness direction is set to be equal to that of the peeling prevention portion 111, but the covering thickness in the height direction is set to be greater than that of the peeling prevention portion 111. Therefore, similar to the above embodiment, the effect of preventing corrosion of the welded portion Y can be achieved.

[0079] In this way, the anchor part reinforcement bar 100 also basically follows the configuration of the anchor part reinforcement bar 44 according to the above embodiment, and therefore the same actions and effects can be obtained with the common configuration. Furthermore, as described above, the overlapping portion 112 (123) between the first and second reinforcing bars 110, 120 may be positioned so as not to overlap with the anchor hole 42 when viewed from the base longitudinal direction of the rising portion 14.

[0080] [supplementary explanation] In the above embodiment and each modified example, the pair of peeling prevention portions of the peeling prevention rib are arranged at the same height in the height direction of the rising portion, but this is not limited to this. The pair of peeling prevention portions may be set at different heights.

[0081] Furthermore, it is not essential that the thicknesses of the pair of reinforcing bars (reinforcing bars) that make up the anti-peeling reinforcement bar are the same, and reinforcing bars of different thicknesses may be used.

[0082] In addition, although the corner configurations of the spalling prevention portion, horizontal portion, overlapping portion, abutting portion, and vertical portion of each pair of reinforcing bars are configured to extend linearly in the above-described embodiment and each modified example, this is not limited to this. For example, from the viewpoint of preventing cracks due to expansion and contraction of concrete, a part or front portion of each component may be deformed into a wave shape, or a part or front portion of each component may be configured to have a convex or concave portion. In addition, from the viewpoint of preventing cracks due to expansion and contraction of concrete, crack prevention bars may be provided so as to span between a pair of vertical portions of each reinforcing bar material. Furthermore, for example, if the contact portion is formed in a continuous wave shape and multiple wave portions that are convex upward in the height direction are formed in the thickness direction of the rising portion, the positioning in the thickness direction can be stabilized by making each wave portion contact the upper end main reinforcement 32 so as to be hooked onto it. Also, by shifting the position of the wave portion that is hooked onto the upper end main reinforcement, the position of the peeling prevention reinforcement can be adjusted along the thickness direction of the rising portion.

[0083] In the above embodiment and each modified example, the foundation 10 is described as a strip foundation, but this is not limited to this, and a mat foundation or an independent foundation may also be used. Furthermore, the reinforcement structure of the foundation 10 is not limited to single reinforcement, but may be double reinforcement. In this case, the two main reinforcements may be arranged inside the vertical portion of the anchor reinforcement.

[0084] The above embodiments and variants have been exemplified as examples of installing building units on a reinforced concrete foundation, but they can also be applied to cases where other types of buildings, such as buildings constructed using steel frame construction or traditional wooden construction, are installed.

[0085] In the above embodiment and each modified example, the anchor hole into which the anchor bolt is inserted and fixed is defined as the anchor part, but this is not limited to this. For example, when the anchor bolt is directly embedded in the rising part of the foundation, the anchor part to be reinforced by the anchor part reinforcing bar may be configured as the anchor part. [Explanation of symbols]

[0086] 10 Concrete foundation 14 Rising section 32 Top main bar (main bar) 40 anchor bolts 42 Anchor hole (anchor part) 44 Reinforcement bars for anchors 50 Peeling prevention streaks 52 Steel bars (reinforced concrete) 54 Peeling prevention part 58 Overlap 60 Contact part 62 Vertical section 70 Reinforcement bars for anchors 80 Reinforcement bars for anchors 81 Peeling prevention streaks 82 First Reinforcement Bar (Reinforcement Bar) 84 Second Reinforcement Bar (Reinforcement Bar) 100 Reinforcement bars for anchors 101 Peeling prevention streaks 110 First Reinforcement Bar (Reinforcement Bar) 120 Second Reinforcement Bar (Reinforcement Bar) Y weld P1 First break point P2 Second break point P3 Third break point

Claims

1. An anchor reinforcement bar that is applied to a rising part in a reinforced concrete foundation and reinforces an anchor part exposed on the top side of the rising part, It is equipped with anti-strip reinforcement bars formed by partially welding two sets of reinforcement bars together, The peeling prevention reinforcement has an overlapping portion between the reinforcing bars to be welded, and a pair of peeling prevention portions arranged on both sides of the rising portion in the thickness direction with the anchor portion in between, The overlapping portions are arranged on both sides of the rising portion in the foundation longitudinal direction, sandwiching the anchor portion, and have a welded portion below the pair of anti-peeling portions, reinforcing bars for anchor portions.

2. The anchor reinforcement bar according to claim 1 , wherein the overlapping portion has the welded portion located inside the rising portion in the thickness direction relative to the pair of anti-peeling portions.

3. The anchor portion reinforcing bar according to claim 1 or 2, wherein the overlapping portion is arranged at a position overlapping with the anchor portion when viewed from the base longitudinal direction of the rising portion.

4. The peeling prevention reinforcement has a contact portion that is provided below the overlapping portion and contacts the upper side of the main reinforcement that is arranged in the rising portion and extends in the longitudinal direction of the foundation, thereby determining the height position of the peeling prevention reinforcement within the rising portion, A reinforcing bar for an anchor portion as described in any one of claims 1 to 3, wherein the abutment portion is formed integrally with the anti-peeling bar by bending the lower side of the overlapping portion of at least one of the pairs of reinforcing bars.

5. The peeling prevention strip is disposed on the opposite side of the peeling prevention portion with the anchor portion interposed therebetween in the thickness direction, and has a vertical portion extending downward from the peeling prevention portion and the overlapping portion, 5. A reinforcing bar for an anchor portion as described in claim 4, wherein at least one of the pairs of reinforcing bars is bent to have a first bending point connecting the anti-peeling portion and the upper end of the overlapping portion, a second bending point connecting the lower end of the overlapping portion and the abutting portion, and a third bending point connecting the abutting portion and the upper end of the vertical portion, and the anti-peeling portion, the overlapping portion, the abutting portion and the vertical portion are integrally formed.

6. The anchor reinforcement bar according to claim 5 , wherein the vertical portion is positioned further inward in the thickness direction of the rising portion than the pair of anti-peeling portions.

7. The rising section of reinforced concrete and An anchor portion exposed on the top end side of the rising portion; The anchor reinforcing bar according to any one of claims 1 to 6, which is embedded in the rising portion while being engaged with the main reinforcement and reinforces the anchor portion; A concrete foundation comprising:

Images