JP2019082030A - Reinforced building and manufacturing method of the same - Google Patents

Abstract

To explain about a reinforced building which can reinforce an existing building easily at low cost.SOLUTION: A reinforcement structure 2 which a reinforced building 3 includes has: a reinforcement column part 21 arranged along a piloti column 4c; a reinforcement leg part 22 arranged along the piloti column 4c; a reinforcement beam part 23 arranged along a piloti beam 4d; and a reinforcement intersection part 24 arranged at a position corresponding to an intersection part 4e. The reinforcement leg part 22 includes a cured body showing compression strength equal to or greater than a concrete cured body. The reinforcement intersection part 24 includes a cured body showing compression strength higher than the concrete cured body. In the reinforcement leg part 22 and a foundation 4a, anchor bars 30, 31 are provided extending so as to communicate these. On an upper surface of the foundation 4a, a recess part 6 recessed downward is provided. On a lower end surface of the reinforcement leg part 22, a protrusion part 25 protruding downward is provided. The recess part 6 and the protrusion part 25 are fitted with each other.SELECTED DRAWING: Figure 2

Description

  The present disclosure relates to a reinforced building in which an existing building is reinforced by a reinforcing structure and a method of manufacturing the same.

  Patent Document 1 discloses a reinforcing method of reinforcing an existing building by integrating a concrete part (reinforcing unit made of precast concrete) manufactured in advance in a factory or the like with an outer side (an outer wall) of the existing building. When assembling these concrete parts, the horizontal PC steel material through which the concrete parts (reinforcement column unit) to be a reinforcement column and the concrete parts (reinforcement beam unit) to be a reinforcement beam are inserted is compressed in advance Prestressing is applied to improve the seismic performance of the reinforcement unit.

JP, 2005-155137, A

  In the case of a reinforcement method using a reinforcement unit as disclosed in Patent Document 1, it is necessary to transport heavy concrete parts from the factory to the site. In addition, in the case of the same reinforcement method, equipment for manufacturing a reinforcement unit and a process of applying prestress to the reinforcement unit are required. Therefore, the complication of the reinforcement method and the cost increase are caused.

  Thus, the present disclosure describes a reinforced building capable of reinforcing an existing building simply and at low cost, and a method of manufacturing the same.

  [1] A reinforced building according to an aspect of the present disclosure includes an existing building and a reinforcing structure that reinforces the existing building. The existing building is located at the intersection of the foundation including the reinforcement inside, the column including reinforcement inside and the column provided on the foundation, the beam including reinforcement inside, the column and the beam And an intersection connected to the end of the column and the end of the beam, respectively. The reinforcing structure is disposed along the column and includes a reinforced concrete including a hardened concrete body in which the reinforcing bars are embedded, and a reinforcing leg disposed along the column and connecting the reinforcing column and the base. And a reinforcement beam portion including a hardened concrete body in which reinforcements are embedded and disposed along the beam portion, and disposed at a position corresponding to the intersection portion, and connecting the end portion of the reinforcement column portion and the end portion of the reinforcement beam portion And a reinforcing intersection. A reinforcement leg is a hardening object which shows compressive strength more than a concrete hardening object, and contains a hardening object by which rebar is arranged inside. The reinforcement intersection portion is a hardened body that exhibits higher compressive strength than the concrete hardened body, and includes a hardened body in which reinforcing bars are disposed. Inside the reinforcing legs and the base, at least one anchor bar extending to communicate them is provided. The upper surface of the base portion is provided with a recess that is recessed downward. The lower end surface of the reinforcing leg portion is provided with a convex portion that protrudes downward. The recess and the protrusion are fitted.

  In a reinforced building according to one aspect of the present disclosure, at least one anchor bar communicates the reinforcing leg with the base, and the projection provided on the lower end face of the reinforcing leg is the base It fits with the recess on the top surface. Therefore, even when an external force in the horizontal direction is applied to the reinforced building due to the occurrence of an earthquake or the like, the shear force acting on the reinforcing column portion is via the convex portion and the concave portion fitted with the anchor bars. Transmitted to the base. Therefore, even if the reinforcing legs adjacent in the horizontal direction are not connected by the reinforcing beam, sufficient reinforcement of the column of the existing building can be achieved. As a result, it becomes possible to reinforce the existing building easily and at low cost.

  [2] In the reinforced building according to the above-mentioned item 1, the reinforced leg portion and the reinforced intersection portion are respectively a hardened body in which the polymer cement mortar is hardened, a hardened body in which the ultra high strength mortar is hardened, or a high strength concrete You may be comprised by hardened | cured material. In this case, it is possible to further improve the earthquake resistance of the reinforced building.

[3] In the reinforced building according to the first or second item, the compressive strength of the reinforcing leg and the reinforcing intersection at a material age of 28 days may be 60 N / mm ² or more. In this case, it is possible to further improve the earthquake resistance of the reinforced building.

[4] In the reinforced building according to any one of the above items 1 to 3, the parameters l and t are respectively l: width of the recess in the extending direction of the beam portion and the reinforcing beam portion t: of the recess When defined as depth, it may satisfy l / t ≧ 3.5. In this case, when the shear force is transmitted between the concave and the convex, the convex becomes extremely difficult to break.

  [5] In the reinforced building according to the above item 4, the depth t may be 7 cm or less. In this case, a relatively shallow recess is obtained. Therefore, while becoming easy to form a crevice in a foundation part, when forming a crevice in a foundation part, it can control that a rebar in a foundation part is exposed. In other words, when forming the recess in the base portion, the reinforcing bars in the base portion become extremely difficult to break.

[6] In the reinforced building according to any one of the above items 1 to 5, the parameters A and B are respectively A: the area of the recess when viewed from above B: the recess when viewed from the top A pair of imaginary straight lines extending at 45 ° with respect to the extending direction of the beam portion and the reinforcing beam portion so as to expand from the stress concentration portion toward the outer peripheral edge of the base portion, the outer peripheral edge of the recess, and the outer peripheral edge of the base portion It may satisfy B / A ≧ 1.0 when it is defined as the area of the area surrounded by. In this case, when the shear force is transmitted between the concave portion and the convex portion, the base portion is extremely hard to be damaged in the vicinity of the concave portion.

  [7] In the reinforced building according to any one of items 1 to 5, the upper surface of the base portion is provided with a first recess and a second recess which are recessed downward. The lower end surface of the reinforcing leg portion is provided with a first convex portion and a second convex portion protruding downward, and the first concave portion and the first convex portion are fitted, The second concave portion and the second convex portion may be fitted. In this case, since the reinforcing leg and the base are connected by the fitting of the plurality of recesses and the plurality of projections, the shear force acting on the reinforcing column is more easily transmitted to the base. Therefore, further reinforcement of the pillar part of the existing building is achieved.

[8] In the reinforced building according to the above item 7, the first and second recesses are arranged along the direction in which the column portion and the reinforcing column portion are arranged, and the first and second convex portions are column portions And the reinforcement columns are aligned, and the parameters A1, B1, A2, B2, C are respectively A1: area of the first recess when viewed from above B1: the first when viewed from the top A pair of first imaginary straight lines extending at 45 ° with respect to the extending direction of the beam portion and the reinforcing beam portion so as to expand from the stress concentration portion of the recess toward the outer periphery of the base portion, and the outer periphery of the first recess And the area of the region surrounded by the outer periphery of the base A2: the area of the second recess when viewed from above B2: the stress concentrated portion of the second recess to the outer periphery of the base when viewed from the top A pair of second imaginary straight lines extending at 45 ° with respect to the extending direction so as to expand toward the outer periphery of the second recess , The area of a region surrounded by the outer peripheral edge of the base portion C: if the area of the region and the area B2 of the area B1 is defined as the area of the overlapping portion,
(B1 + B2-C) / (A1 + A2) ≧ 1.0 may be satisfied. In this case, when shear force is transmitted between the first recess and the first protrusion, and between the second recess and the second protrusion, the base portion is extremely close to each recess. It becomes difficult to break.

[9] In the reinforced building according to the above item 7, the first and second recesses are arranged along the extending direction of the beam portion and the reinforcing beam portion, and the first and second convex portions are beams The parameters A1, B1, A2 and B2 are arranged along the extending direction of the part and the reinforcing beam part, respectively A1: area of the first recess when viewed from above B1: the first when viewed from the top Of a pair of first imaginary straight lines extending at 45 ° with respect to the extending direction so as to expand from the stress concentration portion of the recess toward the second recess, the outer peripheral edge of the first recess and the second recess Area of a region surrounded by a second imaginary straight line in contact with the outer peripheral edge close to the first recess and orthogonal to the extending direction A2: Area of the second recess when viewed from above B2: viewed from the top, It extends from the stress concentration portion of the second recess to the outer peripheral edge side of the base and to the side away from the first recess. If you define the third virtual straight line of the pair extending at 45 ° to the direction, and the outer peripheral edge of the second recess, the area of the region surrounded by the outer peripheral edge of the base portion,
It may satisfy (B1 + B2) / (A1 + A2) ≧ 1.0. In this case, when shear force is transmitted between the first recess and the first protrusion, and between the second recess and the second protrusion, the base portion is extremely close to each recess. It becomes difficult to break.

  [10] A method of manufacturing a reinforced building according to another aspect of the present disclosure includes a base portion including reinforcing bars inside, a column portion including reinforcing bars inside and a pillar portion provided on the base portion, and reinforcing bars inside An existing building is provided with a reinforcement structure in an existing building having a beam and a crossing portion located at the intersection of a column and a beam and connected to the end of the column and the end of the beam. It is a method of manufacturing a reinforced building reinforced by a reinforcing structure. The said manufacturing method arrange | positions a reinforcing bar in the position corresponding to a pillar part, a beam part, and a crossing part, respectively after the 1st process and the 1st process which provide a crevice in the upper surface by covering the upper surface of a foundation part. And a second step of embedding the anchor bar in the base portion so that the upper end portion of the anchor bar faces the lower end portion of the column, and the rebar and anchor bar arranged in the column after the second step By providing the first formwork so as to cover the first formwork and filling the first reinforcement material in the first formwork, the reinforcement leg in which the upper end of the anchor bar is embedded in the inside is the lower end of the post After the third step and the third step, and after the second step, the fourth step of forming the reinforcement column portion by placing concrete in the first formwork after the third step; Provide a second formwork to cover the rebar placed in the section and cast concrete in the second formwork After the fifth step of forming the reinforcing beam portion by the second step and the fourth step, the third formwork is provided to cover the reinforcing bars disposed at the intersection, and the second form in the third formwork And a sixth step of forming a reinforcement intersection by filling the reinforcement material. A reinforcement leg is a hardening object which shows compressive strength more than a concrete hardening object. A reinforcement intersection is a hardening object which shows higher compressive strength than a concrete hardening object. In the third step, the lower end surface of the reinforcing leg portion is formed with a convex portion that protrudes downward and engages with the concave portion by the first reinforcing material filled in the concave portion. In this case, the same effect as that of the reinforced building described in the first paragraph can be obtained.

  [11] In the method according to the above item 10, the first and second reinforcing materials may each be polymer cement mortar, super high strength mortar or high strength concrete. In this case, the same operation and effect as the reinforced building described in the above second paragraph can be obtained.

[12] In the method according to the above item 10 or 11, the compressive strength of the reinforcing leg and the reinforcing intersection at a material age of 28 days may be 60 N / mm ² or more. In this case, the same effect as that of the reinforced building described in the third term can be obtained.

[13] In the method according to any one of items 10 to 12, the parameters l and t are respectively l: width of the recess in the extending direction of the beam portion and the reinforcing beam t: depth of the recess and When defined, it may satisfy l / t 定義 3.5. In this case, the same effect as that of the reinforced building described in the above fourth paragraph can be obtained.

  [14] In the method according to the above item 13, the depth t may be 7 cm or less. In this case, the same effect as that of the reinforced building described in the fifth item can be obtained.

[15] In the method according to any one of items 10 to 14, A: area of the recess when viewed from above A: area of recess when viewed from above B: stress concentration of recess when viewed from above Surrounded by a pair of imaginary straight lines extending at 45 ° with respect to the extending direction of the beam portion and the reinforcing beam portion so as to expand from the portion toward the outer edge of the base portion, the outer edge of the recess and the outer edge of the base portion It may satisfy B / A れ る 1.0 when it is defined as the area of the In this case, the same effect as that of the reinforced building described in the above item 6 can be obtained.

  [16] In the method according to any one of items 10 to 14, in the first step, the first recess and the second recess are formed on the upper surface by turning the upper surface of the base portion. And the first reinforcing material filled in the first convex portion and the second concave portion in the third step, the lower end surface of the reinforcing leg portion protrudes downward and the first and second concave portions First and second convex portions that respectively fit may be formed. In this case, the same effect as that of the reinforced building described in the seventh paragraph can be obtained.

[17] In the method according to the above item 16, the first and second recesses are arranged along the direction in which the column portion and the reinforcing column portion are arranged, and the first and second convex portions are the column portion and the reinforcement The pillars are arranged in a row direction, and the parameters A1, B1, A2, B2, C are respectively A1: area of the first recess when viewed from above B1: of the first recess when viewed from above A pair of first imaginary straight lines extending at 45 ° with respect to the extending direction of the beam portion and the reinforcing beam portion so as to expand from the stress concentration portion toward the outer peripheral edge of the base portion, and the outer peripheral edge of the first recess; Area of the region surrounded by the outer periphery of the base A2: Area of the second recess when viewed from above B2: from the stress concentration portion of the second recess toward the outer periphery of the base when viewed from the top A pair of second imaginary straight lines extending at 45 ° with respect to the extending direction so as to expand and the outer peripheral edge of the second recess Area of the region surrounded by the outer peripheral edge of the base portion C: if the area of the region and the area B2 of the area B1 is defined as the area of the overlapping portion,
It may satisfy (B1 + B2-C) / (A1 + A2) ≧ 1.0. In this case, the same effect as that of the reinforced building described in the eighth paragraph can be obtained.

[18] In the method according to the above item 16, the first and second recesses are aligned along the extending direction of the beam and the reinforcing beam, and the first and second protrusions are the beam and Arranged along the extending direction of the reinforcing beam portion, the parameters A1, B1, A2 and B2 are respectively A1: area of the first recess when viewed from above B1: area of the first recess when viewed from above A pair of first imaginary straight lines extending at 45 ° with respect to the extending direction so as to expand from the stress concentration portion toward the second recess, the outer peripheral edge of the first recess, and the first of the second recesses Area of a region which is in contact with the outer peripheral edge close to the recess and is surrounded by a second imaginary straight line perpendicular to the extending direction A2: area of the second recess as viewed from above B2: second viewed from the top Extending from the stress concentration portion of the concave portion to the outer peripheral side of the base portion and away from the first concave portion The third virtual straight line of the pair extending at 45 ° to the direction, and the outer peripheral edge of the second recess, when you define the area of the region surrounded by the outer peripheral edge of the base portion,
It may satisfy (B1 + B2) / (A1 + A2) ≧ 1.0. In this case, the same effect as that of the reinforced building described in the above item 9 can be obtained.

  According to the reinforced building according to the present disclosure and the method of manufacturing the same, it is possible to simply and inexpensively reinforce the existing building.

FIG. 1 is a perspective view schematically showing an example of a reinforced building in which a reinforcing structure is installed in an existing building having piloti. FIG. 2 is a front view mainly showing the piloti and the reinforcing structure. FIG. 3 is a perspective view mainly showing the lower end portion of the column, the reinforcing leg and the base. FIG. 4 is a plan view mainly showing the lower end portion of the column, the reinforcing leg and the base. FIG. 5 is a cross-sectional view taken along line V-V of FIG. FIG. 6 is a plan view mainly showing a lower end portion of a column, a reinforcing leg and a base in a reinforced building according to another example. FIG. 7 is a plan view mainly showing a lower end portion of a pillar, a reinforcing leg and a base in a reinforced building according to another example. FIG. 8 is a perspective view schematically showing a reinforced building according to another example.

  The embodiments according to the present disclosure described below are exemplifications for describing the present invention, and therefore the present invention should not be limited to the following contents. In the following description, the same reference numeral is used for the same element or the element having the same function, and the overlapping description will be omitted.

[Structure of reinforced building]
First, with reference to FIGS. 1-5, the structure of the reinforced building 3 by which the reinforced structure 2 was constructed by the existing building 1 is demonstrated. The existing building 1 includes a piloti 4 located on the first floor portion (upper portion) and an upper structure 5 located on the top of the piloti 4.

The piloti 4 has a foundation 4a (base portion), a foundation beam 4b, a piloti pillar 4c (column portion), a piloty beam 4d (beam portion), and an orthogonal wall 4h. The foundation 4a and the foundation beam 4b are embedded in the ground (ground) GL (see FIG. 2), and transmit the load of the entire reinforced building 3 to the ground. The foundation 4a, the foundation beam 4b, the piloti column 4c, and the piloti beam 4d are made of, for example, reinforced concrete. That is, these are reinforcing bars (not shown) arranged inside the hardened concrete. The compressive strength at 28 days of material age of the hardened concrete in the existing building 1 may be, for example, 13.5 N / mm ² or more.

  In the example of FIG. 1, the foundations 4 a are arranged along the outer periphery of the reinforced building 3. As shown in FIGS. 2 to 5, the upper surface of the base 4 a is provided with a recess 6 which is recessed downward. The recess 6 is located in front of the piloti column 4 c and has a rectangular shape. The foundation beam 4b and the orthogonal wall 4h extend along one direction (in this example, the depth direction of the existing building 1) between the adjacent foundations 4a.

  The piloti column 4c is erected on the base 4a and extends along the vertical direction. The piloti pillar 4 c connects the base 4 a and the upper structure 5 and supports the upper structure 5. The upper end portion of the piloti column 4c is connected to the piloti beam 4d and also functions as a crossing portion 4e. The piloti beam 4d extends between adjacent piloti columns 4c. The piloti beam 4d supports the upper structure 5 together with the piloti column 4c. The orthogonal wall 4 h is provided in a region surrounded by the foundation beam 4 b, a piloti column 4 c aligned in the depth direction of the existing building 1, and a piloty beam 4 d extending in the depth direction of the existing building 1.

[Composition of reinforcement structure]
Next, the reinforcing structure 2 will be described in detail with reference to FIGS. 1 to 4. The reinforcing structure 2 has a reinforcing column portion 21, a reinforcing leg portion 22, a reinforcing beam portion 23, and a reinforcing intersection portion 24.

The reinforcing column portion 21 is disposed on the surface side of the piloti column 4c, and extends in the vertical direction along the piloti column 4c. The reinforcing pillar portion 21 is configured by arranging reinforcing bars 21b in the hardened concrete body 21a. The compressive strength at 28 days of material age of the hardened concrete in the reinforcement column 21 may be, for example, 27 N / mm ² or more.

  The reinforcing bars 21b are located apart from the surface of the piloti column 4c. The reinforcing bar 21b has a plurality of main bars 21c and a plurality of shear reinforcing bars 21d. The main reinforcement 21 c is longitudinally cut in the reinforcing column 21 so as to extend in the vertical direction. The main reinforcement bars 21 c are spaced apart from one another so as to exhibit a rectangular shape in the reinforcement column 21 when viewed from the vertical direction.

  The shear reinforcing bars 21d have a rectangular shape, and are connected to the main bars 21c so as to surround the main bars 21c. The connection between the shear reinforcement bar 21d and the main bar 21c may be made by welding or engagement using an engagement member such as a hook, for example.

  The lower end portion of the reinforcement column 21 also functions as a reinforcement leg 22. The reinforcing leg portion 22 is disposed on the surface side of the piloti column 4c, and extends in the vertical direction along the lower end portion of the piloti column 4c. The reinforcing legs 22 are located above the recess 6. The reinforcing leg portion 22 is configured by arranging a reinforcing bar 21b in a reinforcing member 22a. A part of the reinforcing member 22 a is embedded in the recess 6. In other words, the lower end surface of the reinforcing leg portion 22 is provided with a convex portion 25 (see FIG. 2) projecting downward. The convex part 25 is fitted with the concave part 6 of the base 4a.

  The compressive strength of the reinforcing member 22a may be equal to or higher than the compressive strength of the hardened concrete body 21a and the hardened concrete body 23a to be described later, when compared with the material age of the same day. The reinforcing member 22a may be, for example, a cured body obtained by curing a polymer cement mortar, or a cured body obtained by curing an ultra high strength mortar, or a cured body obtained by curing high strength concrete (high strength concrete cured It may be a body, or it may be a hardened body (concrete hardened body) in which concrete is hardened.

  In addition to the lower end portion of the reinforcing bar 21b, a plurality of anchor bars 30 and at least one anchor bar 31 are disposed in the reinforcing member 22a. Similar to the main reinforcement 21 c, the plurality of anchor reinforcements 30 are spaced apart from one another so as to have a rectangular shape in the reinforcing legs 22 when viewed from the vertical direction. The upper ends of the plurality of anchor bars 30 are respectively connected to the lower ends of the corresponding main bars 21c.

  At least one anchor muscle 31 is located inside the plurality of anchor muscles 30 as viewed in the vertical direction. In the present embodiment, one anchor muscle 31 is positioned approximately at the center of the reinforcing leg 22 as viewed from the vertical direction so as to pass through the recess 6 and the protrusion 25. The upper end portions of the anchor bars 31 are disposed in the reinforcing member 22 a in a state where they are not connected to any of the main bars 21 c. The lower ends of the anchor bars 30, 31 are disposed in the base 4a. That is, the anchor bars 30, 31 communicate the reinforcing leg 22 with the base 4a.

  The anchor bars 30, 31 play the role of transmitting vibrational energy (for example, seismic energy) transferred from the existing building 1 to the reinforcing structure 2 to the foundation 4a. The anchor muscle 30, 31 may be, for example, an adhesive anchor. In this case, with the lower end portions of the anchor bars 30, 31 inserted in the holes provided in the base 4a so as to extend in the vertical direction, the epoxy resin-based or cement-based adhesive is filled in the holes. Thus, the anchor muscles 30, 31 are fixed to the base 4a. The fixing length of the anchor muscle 30, 31 with respect to the base 4a is not particularly limited as long as sufficient fixation with respect to the base 4a can be achieved, for example, 12 times (12 D) or more of the diameter of the anchor muscle 30, 31 It may be 16 times (16 D) or more the diameter of anchor muscle 30, 31 may be sufficient. The anchor muscles 30, 31 may be, for example, SD 345, SD 295, SD 420, SD 280. In addition, SD345 and SD295 conform to JIS G 3112: 2010 "steel bar for reinforced concrete". SD 420 and SD 280 conform to CNS 560 “National Standard steel bar for mixed rebar of mixed rebars”.

The reinforcing beam portion 23 is disposed on the surface side of the piloty beam 4d, and extends in the horizontal direction along the piloty beam 4d. The reinforcing beam portion 23 is configured by arranging reinforcing bars 23b in the hardened concrete body 23a. The compressive strength at 28 days of age of the hardened concrete in the reinforcing beam portion 23 may be, for example, 27 N / mm ² or more.

  The reinforcing bars 23b are located apart from the surface of the piloty beam 4d. The reinforcing bars 23b have a plurality of main bars 23c and a plurality of shear reinforcement bars 23d. The main bars 23c run longitudinally in the reinforcing beam portion 23 so as to extend in the horizontal direction. The main bars 23c are spaced apart from one another so as to have a rectangular shape in the reinforcing beam portion 23 when viewed in the horizontal direction.

  The shear reinforcing bars 23d have a rectangular shape, and are connected to the main bars 23c so as to surround the main bars 23c. The connection between the shear reinforcing bars 23d and the main bars 23c may be made, for example, by welding or engagement using an engagement member such as a hook.

  The reinforcement intersection portion 24 is disposed on the surface side of the intersection portion 4 e. The reinforcing intersection portion 24 connects the end portions of the reinforcing column portion 21 and the reinforcing beam portion 23 to each other. Therefore, the reinforcement intersection portion 24 is located at the intersection of the reinforcement column portion 21 and the reinforcement beam portion 23. Therefore, the reinforcing structure 2 has a U-shape as a whole by the reinforcing column portion 21, the reinforcing leg portion 22, the reinforcing beam portion 23 and the reinforcing intersection portion 24.

  The reinforcing cross portion 24 is configured by arranging the reinforcing bars 21 b and 23 b in the reinforcing member 24 a. The compressive strength of the reinforcing member 24a may be greater than the compressive strength of the hardened concrete bodies 21a and 23a when compared at the same material age on the same day. The reinforcing member 24a may be, for example, a hardened body in which a polymer cement mortar is hardened, or a hardened body in which an ultra high strength mortar is hardened, and a hardened body in which high strength concrete is hardened (high strength concrete hardened It may be a body, or it may be a hardened body (concrete hardened body) in which concrete is hardened.

[Details of recess]
Here, the recess 6 will be described in more detail with reference to FIGS. 4 and 5.

It is desirable that the foundation 4a is not broken when a shearing force acts on the recess 6 from the protrusion 25 due to the occurrence of an earthquake or the like. Here, as shown in FIG. 4, temporarily, a shearing force acts on the concave portion 6 from the convex portion 25 in the left direction of FIG. 4, and the region R between the concave portion 6 and the foundation 4a is broken horizontally. The case is Since the direction of the maximum shear stress is considered to be 45 ° from the corner portion P which is the stress concentration portion of the recess 6, an angle of 45 ° with respect to the extending direction (horizontal direction) of the foundation beam 4b and the reinforcing beam portion 23. The pair of imaginary straight lines extending from the corner portion P toward the left outer peripheral edge 4f of the foundation 4a so as to extend toward each other is the shear band SB. Therefore, the region R is configured to be surrounded by the left outer peripheral edge 6a of the recess 6, the pair of shear bands SB, and the left outer peripheral edge 4f of the foundation 4a. Parameters A and B respectively l: width of recess 6 [cm]
b: Depth of recess 6 [cm]
L: Distance between recess 6 and left outer peripheral edge 4 f (height of region R) [cm]
A: Area [cm ² ] of the recess 6 when viewed from above
B: Area of area R when viewed from above [cm ² ]
F _c-ex : Compressive strength [kg / cm ² ] of hardened concrete that constitutes the foundation 4a
F _c : Compressive strength [kg / cm ² ] of the reinforcing member 22a constituting the reinforcing leg 22
Q _PA : Ultimate shear strength of region R [kg]
_R Q: Ultimate shear strength [kg] of convex part 25
A, B, Q _PA and _R Q are respectively represented by formulas 1 to 4.
A = b × l (1)

そこで、式３〜５をＡ，Ｂで整理すると式６が得られる。

従って、凹部６の面積Ａ及び領域Ｒの面積Ｂは、少なくとも式６を満たしていてもよい。 If the equation 5 is satisfied, the region R of the foundation 4a is not sheared prior to the convex portion 25.

Therefore, formula 6 is obtained by arranging formulas 3-5 with A and B.

Therefore, the area A of the recess 6 and the area B of the region R may satisfy at least the equation 6.

表１より、Ｂ／Ａ≧１．０であってもよいし、Ｂ／Ａ≧１．２であってもよいし、Ｂ／Ａ≧１．４であってもよい。凹部６と凸部２５との間でせん断力が伝達する際に、凸部２５が極めて破損し難くなる。 Hereinafter, the value of a typical F _c-ex concrete cured body constituting the basic 4a, the value of a typical F _c of the reinforcing member 22a constituting the reinforcing legs 22 when substituted into equation 6 Indicates the value of B / A.

From Table 1, B / A ≧ 1.0, B / A ≧ 1.2, and B / A ≧ 1.4 may be satisfied. When the shear force is transmitted between the concave portion 6 and the convex portion 25, the convex portion 25 becomes extremely difficult to break.

It is desirable that the foundation 4a (region R) is not broken when a shearing force acts on the concave portion 6 from the convex portion 25 due to the occurrence of an earthquake or the like. Here, the parameters t and _R N are each t: depth of the recess 6 (see FIG. 5) [cm]
_R N: Axial force at the mechanism [kg]
Then, _R N is expressed by Equation 7.
_R N = t × b × 0.8 F _c-ex (7)

そこで、式１，４，７，８をｌ，ｔで整理すると式９が得られる。

従って、凹部６の幅ｌ及び深さｔは、少なくとも式９を満たしていてもよい。 If Formula 8 is satisfied, the convex part 25 will not be sheared and destroyed.

Therefore, formula 9 is obtained by arranging formulas 1, 4, 7 and 8 with l, t.

Therefore, the width l and the depth t of the recess 6 may satisfy at least the equation 9.

表２より、ｌ／ｔ≧３．５であってもよいし、ｌ／ｔ≧４．５であってもよいし、ｌ／ｔ≧５．５であってもよい。この場合、凹部６と凸部２５との間でせん断力が伝達する際に、凸部２５が極めて破損し難くなる。 In the following, the value of representative F _c-ex of the hardened concrete constituting the foundation 4 a and the value of representative F _c of the reinforcing member 22 a constituting the reinforcing leg portion 22 are substituted into the formula 9 Indicates the value of l / t.

According to Table 2, l / t3.53.5, l / t ≧ 4.5, and l / t ≧ 5.5 may be satisfied. In this case, when the shear force is transmitted between the concave portion 6 and the convex portion 25, the convex portion 25 becomes extremely difficult to be damaged.

On the other hand, the depth t of the recess 6 may be 7 cm or less, 5 cm or less, or 3 cm or less. In this case, a relatively shallow recess 6 is obtained. Therefore, while becoming easy to form crevice 6 in foundation 4a, when forming crevice 6 in foundation 4a, it can control that a rebar in foundation 4a is exposed. In other words, when forming the recess 6 in the foundation 4a, the reinforcing bars in the foundation 4a become extremely difficult to break.

  As shown in FIG. 5, the angle θ between the bottom wall and the side wall of the recess 6 may be 90 °, less than 90 °, or more than 90 °. The angle θ may be, for example, about 70 ° to 110 °, or about 80 ° to 100 °. If the angle θ is in this range, the recess 6 having such an angle θ can be relatively easily formed.

[Method of reinforcing existing building (method of manufacturing reinforced building)]
Subsequently, with reference to FIG. 4, a method of reinforcing the existing building 1 by constructing the reinforcing structure 2 on the existing building 1, that is, a method of manufacturing the reinforcing structure 2 will be described. First, the concave portion 6 is formed on the upper surface of the foundation 4 a and a place where the reinforcing leg portion 22 is to be provided (first step).

  Next, anchor bars 30, 31 are provided to the base 4a. Next, the reinforcing bars 21b are arranged on the surface side of the piloti column 4c, and the reinforcing bars 23b are arranged on the surface side of the piloti beam 4d (second step). The installation order of the anchor bars 30, 31 and the reinforcing bars 21b, 23b is not limited to this, and the anchor bars 30, 31 may be provided on the foundation 4a after arranging the reinforcing bars 21b, 23b. Next, the upper end of the anchor muscle 30 is connected to the lower end of the main muscle 21c.

  Next, a mold (first mold) is configured to surround the lower end portion of the reinforcing bar 21b. Next, a reinforcing material (first reinforcing material) to be the reinforcing member 22a is filled in the formwork. The reinforcing material may be poured from the top of the form or pressed into from the bottom of the form. The reinforcing legs 22 are formed by removing the formwork after curing of the reinforcing material (third step).

  Next, a mold (a first mold) is configured to surround a portion of the reinforcing bar 21b below the intersection 4e. Next, cast concrete in the formwork. The reinforcement column 21 is configured by removing the formwork after hardening of the concrete (fourth step).

  When the reinforcing column 21 and the reinforcing leg 22 are formed of the same reinforcing material, a mold (first mold) is configured to surround a portion of the rebar 21b below the intersection 4e, Concrete may be cast in the formwork. In this case, the reinforcement column 21 and the reinforcement leg 22 are simultaneously configured by removing the formwork after hardening the concrete.

  Next, a mold (a second mold) is configured to surround a portion of the reinforcing bar 23b corresponding to the piloti beam 4d. Next, cast concrete in the formwork. The reinforcement beam portion 23 is configured by removing the formwork after hardening of the concrete (a fifth step).

  Next, a mold (third mold) is configured to surround a portion of the reinforcing bars 21b and 23b that corresponds to the intersection 4e. Next, the formwork is filled with a reinforcing material (second reinforcing material) to be the reinforcing member 24a. The reinforcing material may be poured from the top of the form or pressed into from the bottom of the form. By removing the formwork after curing of the reinforcing material, a reinforcing intersection 24 is formed (sixth step).

  Thus, a reinforced structure 2 configured of the reinforcement column portion 21, the reinforcement leg portion 22, the reinforcement beam portion 23 and the reinforcement intersection portion 24 is obtained. By the above, the reinforcement structure 2 is provided in the existing building 1, and the reinforced building 3 is completed.

[Details of polymer cement mortar]
(1) Polymer Cement Composition Subsequently, the details of the polymer cement mortar will be described. The polymer cement composition to be the polymer cement mortar is a polymer cement composition for reinforcement method, and the cement, fine aggregate, fluidizing agent, re-emulsifiable powder resin, inorganic expansive material, and synthetic resin fiber Contains

  Cement is common as a hydraulic material, and any commercially available product can be used. Among them, it is preferable to include portland cement specified in JIS R 5210: 2009 "Portland cement". From the viewpoint of flowability and quick setting, it is more preferable to include early-strength Portland cement.

The specific surface area of cement bran from the viewpoint of strength development is
Preferably 3000cm ² / g~6000cm ² / g,
More preferably 3300cm ² / g~5000cm ² / g,
More preferably 3500cm ² / g~4500cm ² / g.

  As fine aggregate, sands such as silica sand, river sand, land sand, sea sand and crushed sand can be exemplified. The fine aggregate can be used singly or in combination of two or more selected from among these. Among these, it is preferable to include silica sand from the viewpoint of further facilitating the filling property of the polymer cement mortar into the mold.

  When fine aggregate is sieved according to the method defined in JIS A 1102: 2014 “Method for testing aggregate sieving”, the mass fraction (%) remaining between successive sieves is 0 at a sieve mesh size of 2000 μm. It is preferable that it is mass%. When the fine aggregate passes all through a sieve with a sieve opening of 2000 μm, the mass fraction is 0% by mass.

The mass fraction (%) that remains between each successive sieve is
It is 5.0-25.0 in 1180 micrometers of sieve openings,
20.0 to 50.0 at a sieve opening of 600 μm,
It is 20.0-50.0 in 300 micrometers of sieve openings.
5.0 to 25.0 at a sieve opening of 150 μm,
It is preferably 0 to 10.0 at a sieve opening of 75 μm,
The mass fraction (%) that remains between each successive sieve is
It is 10.0 to 20.0 in 1180 μm of a sieve mesh,
In the mesh of 600 μm, it is 25.0 to 45.0,
In the 300 μm sieve, it is 25.0 to 45.0,
10.0 to 20.0 at a sieve opening of 150 μm,
It is more preferable that it is 0-5.0 in 75 micrometers of sieve openings.

  When fine aggregate is sieved according to the above-mentioned rule, a mortar having better material separation resistance and fluidity can be obtained because the mass fraction (%) remaining between successive sieves is within the above range. It is possible to obtain a mortar cured body having higher compressive strength.

When the fine aggregate is sieved by the method defined in JIS A 1102: 2014 “Test method for screening of aggregate”, the coarse particle ratio of the fine aggregate is preferably 2.00 to 3.00,
More preferably, it is 2.20-2.80,
More preferably, it is 2.30-2.70.

  When the coarse aggregate rate of the fine aggregate is in the above-described range, a polymer cement mortar having better material separation resistance and fluidity, and a mortar cured body having better strength characteristics can be obtained.

  The above-mentioned sieving can be carried out using several sieves having different openings defined in JIS Z 8801-1: 2006 "sieve for test-part 1: metal mesh sieve".

The content of fine aggregate is 100 parts by mass of cement,
Preferably it is 80 mass parts-170 mass parts,
More preferably, it is 90 parts by mass to 160 parts by mass,
More preferably, it is 100 parts by mass to 150 parts by mass.

  By setting the content of the fine aggregate in the above-mentioned range, it is possible to obtain a hardened mortar having a higher compressive strength.

  The fluidizing agent may be exemplified by formaldehyde condensate of melamine sulfonic acid, casein, calcium casein, and polycarboxylic acid. The fluidizing agent can be used singly or in combination of two or more selected from among these. Among these, from the viewpoint of obtaining a high water reduction effect, it is preferable to include a polycarboxylic acid fluidizer. By using a polycarboxylic acid fluidizing agent, the water powder ratio can be reduced, and the strength development of the cured mortar can be further improved.

The content of the fluidizing agent is, based on 100 parts by mass of cement,
Preferably, it is 0.02 parts by mass to 0.70 parts by mass,
More preferably, it is 0.05 parts by mass to 0.65 parts by mass,
More preferably, it is 0.10 parts by mass to 0.60 parts by mass.

  By setting the content of the fluidizing agent in the above range, a polymer cement mortar having better fluidity can be obtained. In addition, a hardened mortar can be obtained which has a higher compressive strength.

  The type and production method of the re-emulsifiable powder resin is not particularly limited, and those produced by known production methods can be used. Examples of re-emulsifiable powder resins include those of polyacrylic acid ester resin systems, styrene butadiene synthetic rubber systems, and vinyl acetate / beaber acrylic copolymer systems. The re-emulsifiable powder resin can be used singly or in combination of two or more selected from among these. The re-emulsifiable powder resin may have an antiblocking agent on the surface. From the viewpoint of the durability of the hardened mortar, the re-emulsifiable powder resin preferably contains an acryl. Furthermore, in view of adhesion and compressive strength, the glass transition temperature (Tg) of the re-emulsifiable powder resin is preferably in the range of 5 to 20 ° C.

The content of the re-emulsifiable powder resin is, based on 100 parts by mass of cement,
Preferably, it is 0.5 parts by mass to 5.0 parts by mass,
More preferably, it is 0.7 parts by mass to 4.0 parts by mass,
More preferably, it is 1.0 mass part-3.0 mass parts.

  By setting the content of the re-emulsifiable powder resin in the above-mentioned range, the adhesiveness of the polymer cement mortar and the compressive strength of the hardened mortar can be compatible at a still higher level.

  Examples of the inorganic expansive material include quick lime-gypsum expansive material, gypsum expansive material, calcium sulfoaluminate expansive material, quick lime-gypsum-calcium sulphoaluminate expansive material, and the like. The inorganic expansion material can be used singly or in combination of two or more selected from among these. Among these, from the viewpoint of further improving the compressive strength of the hardened mortar, it is preferable to contain a quicklime-gypsum-calcium sulfoaluminate-based expansive agent.

The content of the inorganic expansive agent is 100 parts by mass of cement,
Preferably, it is 0.1 parts by mass to 7.0 parts by mass,
More preferably, it is 0.3 parts by mass to 5.0 parts by mass,
More preferably, it is 0.5 parts by mass to 3.0 parts by mass.

  By setting the content of the inorganic expansive material in the above-mentioned range, the proper expansibility is further developed, and the shrinkage of the hardened mortar can be suppressed, and the compressive strength of the hardened mortar can be further increased. it can.

  Examples of synthetic resin fibers include polyethylene, polyolefins such as ethylene / vinyl acetate copolymer (EVA), polypropylene, polyester, polyamide, polyvinyl alcohol, vinylon, polyvinyl chloride and the like. The synthetic resin fiber can be used singly or in combination of two or more selected from among these.

The fiber length of the synthetic resin fiber is, from the viewpoint of the dispersibility in the mortar and the improvement of the crack resistance of the hardened mortar,
Preferably it is 6 mm to 18 mm,
More preferably, it is 8 mm to 16 mm.
More preferably, it is 10 mm to 14 mm.

The content of synthetic resin fiber is 100 parts by mass of cement,
Preferably, it is 0.10 parts by mass to 0.70 parts by mass,
More preferably, it is 0.20 parts by mass to 0.60 parts by mass,
More preferably, it is 0.25 parts by mass to 0.55 parts by mass.

  By setting the fiber length and content of the synthetic resin fiber in the above-mentioned range, the dispersibility in the mortar and the crack resistance of the hardened mortar can be further improved. That is, by the presence of the synthetic resin fiber, it is possible to suppress the cracking of the hardened mortar and to improve the bending resistance of the hardened mortar. Moreover, the drying shrinkage at the time of hardening becomes small, and the time until the strength of the mortar hardened body is developed can be shortened. Therefore, the construction period can be shortened.

  The polymer cement composition of the present embodiment may contain a setting regulator, a thickener, a metal-based expansion material, an antifoaming agent, and the like according to the application.

(2) Polymer-Modified Mortar The polymer-based mortar comprises the above-described polymer cement composition and water. A polymer cement mortar can be prepared by blending and kneading the above-described polymer cement composition and water. The polymer cement mortar prepared in this way has excellent flowability (flow value). For this reason, filling (pouring) in the mold for forming the reinforcement structure 2 can be smoothly performed. Therefore, it can be suitably used as a polymer cement mortar for producing the reinforcing structure 2. When preparing the polymer cement mortar, the flow value of the polymer cement mortar can be adjusted by appropriately changing the water powder ratio (the amount of water / the amount of the polymer cement composition).

The water to powder ratio is
Preferably, it is 0.08 to 0.16.
More preferably, it is 0.09 to 0.15.
More preferably, it is 0.10-0.14.

  By setting the water powder ratio in the above-mentioned range, the polymer cement mortar before curing develops good fluidity, and the mortar cured body in which the polymer cement mortar is cured develops sufficient strength. Therefore, the existing building 1 can be sufficiently reinforced by the hardened mortar hardening body.

  The flow value in the present specification is measured by the following procedure. A cylindrical-shaped vinyl chloride pipe with an inner diameter of 50 mm and a height of 100 mm is placed on a glass sheet of only 5 mm in thickness. At this time, one end of the vinyl chloride pipe is in contact with the flat plate glass, and the other end is disposed so as to face upward. The polymer cement mortar is poured from the opening on the other end side, and after filling the polymer cement mortar in the vinyl chloride pipe, the vinyl chloride pipe is pulled up vertically. After the mortar spread has stopped, the diameters (mm) in two directions orthogonal to each other are measured. Let the average value of the measured values be the flow value (mm).

The flow value of polymer cement mortar is
Preferably, it is 170 mm to 250 mm.
More preferably, it is 190 mm to 240 mm.
More preferably, it is 200 mm to 230 mm.

  When the flow value is in the above-mentioned range, a polymer cement mortar excellent in material separation resistance and filling property can be obtained. In addition, the flowability of the polymer cement mortar before curing can be secured.

(3) Hardened Mortar A hardened mortar can be formed by hardening the above-mentioned polymer cement mortar. The mortar cured product thus formed is excellent in strength development when it is integrated with the concrete forming the lower end portion or intersection 4e of the piloti column 4c. For this reason, the construction period of the reinforcement method can be shortened. Moreover, since it has the outstanding intensity | strength characteristic and the outstanding durability, the earthquake resistance of the existing building 1 can be improved.

The compressive strength in the present specification is a value (N / mm ² ) obtained in accordance with "7. Test of cured polymer cement mortar" of JIS A 1171: 2000 "Test method of polymer cement mortar". The bending strength in the present specification is a value (N / mm ² ) obtained in accordance with "7. Test of cured polymer cement mortar" of JIS A 1171: 2000 "Test method of polymer cement mortar".

The compressive strength at 28 days of age of the hardened mortar measured by the above-mentioned test method is
Preferably, it is 60 N / mm ² or more.
More preferably, it is 70 N / mm ² or more.
It is preferable that the compressive strength of the hardened mortar after 28 days is also in the above-mentioned range.

  When it is integrated with the concrete which makes the lower end part or intersection part 4e of the piloti pillar 4c because compressive strength is the above-mentioned range, it is possible to exhibit further superior earthquake resistance performance.

[Details of ultra high strength mortar]
Subsequently, ultra high strength mortar will be described. As an example of super high strength mortar, a mortar composition produced by adding fiber and water to a hydraulic composition containing cement, silica fume, fine aggregate, fine inorganic powder, water reducing agent and antifoaming agent can be mentioned.

Regarding the mineral composition of the above cement, the amount of C ₃ S is
Preferably it is 40.0 mass%-75.0 mass%,
More preferably, it is 45.0% by mass to 73.0% by mass,
More preferably, it is 48.0% by mass to 70.0% by mass,
Particularly preferably, it is 50.0% by mass to 68.0% by mass.

If the C ₃ S content is less than 40.0% by mass, the compressive strength tends to be low, and if it exceeds 75.0% by mass, the cement itself tends to be difficult.

Regarding the mineral composition of the above cement, the amount of C ₃ A is
Preferably it is less than 2.7% by mass,
More preferably, it is less than 2.3% by mass,
More preferably, it is less than 2.1% by mass,
Particularly preferably, it is less than 1.9% by mass.

If the amount of C ₃ A is 2.7% by mass or more, the flowability tends to be insufficient. The lower limit of the amount of C ₃ A is not particularly limited, but is about 0.1% by mass.

Regarding the mineral composition of the above cement, the C ₂ S content is
Preferably it is 9.5 mass%-40.0 mass%,
More preferably, it is 10.0% by mass to 35.0% by mass,
More preferably, it is 12.0 mass% to 30.0 mass%.

Regarding the mineral composition of the above cement, the amount of C ₄ AF is
Preferably, it is 9.0% by mass to 18.0% by mass,
More preferably, it is 10.0% by mass to 15.0% by mass,
More preferably, it is 11.0 mass% to 15.0 mass%.

  If it is the range of the mineral composition of such cement, it will become easy to ensure the high fluidity | liquidity of a mortar composition, and the high compressive strength of its hardening body.

For cement particle size, the upper limit of 45 μm sieve residue is
Preferably it is 25.0 mass%,
More preferably, it is 20.0 mass%,
More preferably, it is 18.0% by mass,
Particularly preferably, it is 15.0% by mass.

For cement particle size, the lower limit of 45 μm sieve residue is
Preferably it is 0.0 mass%,
More preferably, it is 1.0% by mass,
More preferably, it is 2.0% by mass,
Particularly preferably, it is 3.0% by mass.

  If the particle size of cement is in this range, high compressive strength can be secured. In addition, since the slurry prepared using this cement has an appropriate viscosity, sufficient dispersibility can be ensured even when fibers described later are added.

The specific surface area of cement bran is
Preferably 2500cm ² / g~4800cm ² / g,
More preferably 2800cm ² / g~4000cm ² / g,
More preferably from 3000cm ² / g~3600cm ² / g,
Particularly preferably 3200cm ² / g~3500cm ² / g.

When the brane specific surface area of the cement is less than 2500 cm ² / g, the strength of the mortar composition tends to be low, and when it exceeds 4800 cm ² / g, the fluidity at a low water cement ratio tends to be lowered.

  In the production of the above-mentioned cement, it is not necessary to carry out an operation different from the ordinary cement in particular. The above cement changes the composition of raw materials such as limestone, silica stone, slag, coal ash, construction generated soil, blast furnace dust, etc. according to the target mineral composition, and after firing in a real machine kiln, adds gypsum to the obtained clinker It can be produced by grinding to a predetermined particle size. A common NSP kiln, SP kiln, etc. can be used for a kiln which bakes, and a grinder, such as a general ball mill, can be used for grinding. Moreover, two or more types of cements can also be mixed as needed.

The above-mentioned silica fume is a by-product obtained by collecting dust in exhaust gas generated when producing metal silicon, ferrosilicon, fused zirconia, etc., and the main component is amorphous which is dissolved in an alkaline solution. It is SiO ₂ .

The average particle size of silica fume is
Preferably it is 0.05 micrometer-2.0 micrometers,
More preferably, it is 0.10 μm to 1.5 μm,
More preferably, it is 0.18 μm to 0.28 μm,
Particularly preferably, it is 0.20 μm to 0.28 μm.

  By using such silica fume, it becomes easy to ensure the high fluidity of the mortar composition and the high compressive strength of the cured product.

The above mortar composition comprises silica fume, based on the total amount of cement and silica fume,
Preferably, it contains 3% by mass to 30% by mass
More preferably, it contains 5% by mass to 20% by mass,
More preferably, it contains 10% by mass to 18% by mass,
Particularly preferably, it contains 10% by mass to 15% by mass.

  The fine aggregate is not particularly limited, but it may be river sand, land sand, sea sand, crushed sand, silica sand, limestone fine aggregate, blast furnace slag fine aggregate, ferronickel slag fine aggregate, copper slag fine aggregate, electric furnace An oxidized slag fine aggregate or the like may be used. The water absorption of the fine aggregate is preferably 5.00% or less, more preferably 4.00% or less, still more preferably 3.00% or less, particularly preferably 2.80% or less . Thereby, more stable fluidity can be obtained. Moreover, "water absorption" means the value measured according to the measuring method of the water absorption (unit:%) of the aggregate prescribed | regulated to JISA1109: 2006. Moreover, as for the particle size of a fine aggregate, it is preferable to pass a 5 mm sieve 85 mass% or more through a 10 mm sieve altogether.

Also, the amount of fine aggregate in the fiberless mortar composition is
100kg ^{/ m 3} ~800kg ^/ m 3 are preferred,
More preferably ^{200kg / m 3 ~600kg / m 3} ,
250kg ^{/ m 3} ~500kg ^/ m 3 is more preferable.

As the inorganic fine powder, fine powder such as limestone powder, silica stone powder, crushed stone powder, slag powder and the like may be used. The inorganic fine powder is a fine powder obtained by grinding or classifying limestone powder, silica stone powder, crushed stone powder, slag powder, etc. to a Blaine specific surface area of 2500 cm ² / g or more, and may improve the fluidity of mortar composition Be expected.

The brane specific surface area of the inorganic fine powder is
Preferably 3000cm ² / g~5000cm ² / g,
More preferably 3200cm ² / g~4500cm ² / g,
More preferably from 3400cm ² / g~4300cm ² / g,
Particularly preferably 3600cm ² / g~4300cm ² / g.

A mixture of fine aggregate and inorganic fine powder is a group of particles having a particle size of 0.15 mm or less,
Preferably, it contains 40% by mass to 80% by mass
More preferably, it contains 45% by mass to 80% by mass,
More preferably, it contains 50% by mass to 75% by mass.

The above mixture contains particles having a particle diameter of 0.075 mm or less.
Preferably, 30% by mass to 80% by mass is included,
More preferably, it contains 35% by mass to 70% by mass,
More preferably, it contains 40% by mass to 65% by mass.

  If the particle group having a particle size of 0.075 mm or less contained in the mixture of the fine aggregate and the inorganic fine powder is less than 30% by mass, the viscosity of the mortar composition may be insufficient to cause material separation.

The mixture of fine aggregate and inorganic fine powder is based on 100 parts by mass of cement and silica fume in total.
Preferably, 10 parts by mass to 60 parts by mass of fine aggregate and 5 parts by mass to 55 parts by mass of inorganic fine powder,
More preferably, 15 parts by mass to 45 parts by mass of fine aggregate, and 10 parts by mass to 40 parts by mass of inorganic fine powder,
More preferably, 20 parts by mass to 35 parts by mass of fine aggregate and 15 parts by mass to 30 parts by mass of inorganic fine powder are contained.

Moreover, the unit quantity of the mixture of the fine aggregate and the inorganic fine powder per 1 m ^{3 of the} mortar composition containing no fiber is
Preferably ^{200kg / m 3 ~1000kg / m 3} ,
More preferably ^{400kg / m 3 ~900kg / m 3} ,
More preferably from ^{500kg / m 3 ~800kg / m 3} .

  As the water reducing agent, lignin type, naphthalene sulfonic acid type, amino sulfonic acid type, polycarboxylic acid type water reducing agent, high performance water reducing agent, high performance AE water reducing agent, etc. may be used. From the viewpoint of securing fluidity at a low water-cement ratio, a polycarboxylic acid-based water reducing agent, a high-performance water reducing agent, or a high-performance AE water reducing agent may be used as a water reducing agent. An agent may be used. Moreover, in order to obtain a mortar composition of premix type in which the water reducing agent is mixed beforehand, it is preferable that the water reducing agent has a powder property.

The mortar composition preferably contains 0.01 to 6.0 parts by mass of a water reducing agent with respect to 100 parts by mass of cement and silica fume in total.
More preferably, it contains 0.05 parts by mass to 4.0 parts by mass,
More preferably, it contains 0.07 parts by mass to 3.0 parts by mass,
Most preferably, it contains 0.10 mass part-2.0 mass parts.

Examples of the above-mentioned antifoaming agent include special non-ionic blended surfactants, polyalkylene derivatives, hydrophobic silica, polyethers and the like. In this case, the mortar composition contains an antifoaming agent relative to 100 parts by mass of the total amount of cement and silica fume.
Preferably 0.01 to 2.0 parts by mass are included,
More preferably, it contains 0.02 parts by mass to 1.5 parts by mass,
More preferably, it contains 0.03 mass part-1.0 mass part.

  The mortar composition may contain, if necessary, one or more of an expanding agent, a shrinkage reducing agent, a setting accelerator, a setting retarder, a thickener, a re-emulsifiable resin powder, a polymer emulsion and the like.

In the above mortar composition, the amount of water added is 100 parts by mass of the total amount of cement and silica fume,
Preferably, it is 10 parts by mass to 25 parts by mass,
More preferably, it is 12 parts by mass to 20 parts by mass,
More preferably, it is 13 parts by mass to 18 parts by mass.

The unit water content of the fiberless mortar composition is
Preferably ^{180kg / m 3 ~280kg / m 3} ,
More preferably ^{200kg / m 3 ~270kg / m 3} ,
More preferably from ^{210kg / m 3 ~260kg / m 3} .

  The mortar composition (super high strength mortar) contains fibers as described above. Fibers include organic fibers and inorganic fibers. Examples of organic fibers include polypropylene fibers, polyethylene fibers, vinylon fibers, acrylic fibers, nylon fibers and the like. Glass fiber, carbon fiber, etc. are mentioned as inorganic fiber.

The standard fiber length of fiber is
Preferably it is 2 mm-50 mm,
More preferably, it is 3 mm to 40 mm.
More preferably, it is 4 mm to 30 mm.
Particularly preferably, it is 5 mm to 20 mm.

The upper limit of the fiber elongation is
Preferably it is 200% or less,
More preferably, it is 100% or less.
More preferably, it is 50% or less.
Particularly preferably, it is at most 30%.

  The lower limit value of the elongation at break of the fiber is preferably 1% or more.

The specific gravity of fiber is
Preferably it is 0.90 to 3.00,
More preferably, it is 1.00 to 2.00.
More preferably, it is 1.10 to 1.50.

The aspect ratio of fibers (standard fiber length / fiber diameter) is
Preferably it is 5 to 1200.
More preferably, it is 10 to 600.
More preferably, it is 20-300.
Particularly preferred is 30 to 200.

  By using fibers satisfying these conditions, high fluidity of the mortar composition can be secured, and fire resistance performance can also be improved. In addition, it is also possible to suppress breakage due to impact such as corner chipping.

The amount of fiber added to the mortar composition without fiber is
Preferably it is 0.05 volume%-4 volume%,
More preferably, it is 0.1% by volume to 3% by volume,
More preferably, it is 0.3% by volume to 2% by volume.

  If the amount of fiber added is 0.05% by volume or more, sufficient fire explosion resistance and impact resistance tend to be easily obtained. If the amount of the organic fiber added is 4% by volume or less, the organic fiber tends to be easily mixed in the mortar composition.

  Although the manufacturing method of the said mortar composition is not specifically limited, A part or all of materials other than water and an organic fiber are mixed beforehand, Next, it adds and mixes with water, and it mixes and mixes. You may The mixer used for mixing the mortar composition is not particularly limited, and a mortar mixer, a two-axis forced mixer, a pan mixer, a grout mixer, etc. may be used. The mortar composition may be of a cold setting type so that the standard heat treatment does not need to be performed on site.

The compressive strength at 28 days of age of hardened mortar with ultra-high strength mortar is from the viewpoint of earthquake resistance, cost and durability,
Preferably ^{80N / mm 2 ~200N / mm 2} ,
More preferably ^{100N / mm 2 ~200N / mm 2} ,
150N ^/ mm ² ~200N ^/ mm 2 is more preferable.

[Details of high strength concrete]
Subsequently, the details of high strength concrete will be described. High strength concrete conforms to the high strength concrete described in JIS A 5308: 2014 "Ready Mixed Concrete", and contains cement, aggregate, admixture, and water.

  Cement is common as a hydraulic material, and any commercially available product can be used. Among them, JIS R 5210: 2009 "Portland cement", JIS R 5211: 2009 "blast furnace cement", JIS R 5212: 2009 "silica cement", JIS R 5213: 2009 "fly ash cement" It is preferable to include.

  As the aggregate, it is preferable to use crushed stone and crushed sand or gravel and sand described in JIS A 5308: 2014 "ready mixed concrete" Appendix A "aggregate for ready mixed concrete".

  25 mm or less is preferable and, as for the largest dimension of a crushed stone and a gravel, 20 mm or less is more preferable.

  Admixture materials are JIS A 6201: 2015 “fly ash for concrete”, JIS A 6202: 2017 “expansion material for concrete”, JIS A 6204: 2011 “chemical admixture for concrete”, JIS A 6205: 2013 “prevention for concrete Cements, JIS A 6206: 2013 "fine blast furnace slag powder for concrete" and JIS A 6207: 2016 "silica fume for concrete" fly ash, expansive agent, chemical admixture, anti-corrosion agent, blast furnace slag fine powder It is preferred to use at least one selected from silica fume and silica fume.

  The high-strength concrete slump is preferably 6 cm to 20 cm. The slump flow is preferably 42.5 cm to 70 cm.

  The air content of the high strength concrete is preferably 3.0% to 6.0%.

Compressive strength at age of 28 days of the concrete hardened body with high strength concrete is preferably 50 N / mm ² or more, more preferably 55N / mm ² or more, 60N / mm ² or more is more preferable.

[Effect]
In the present embodiment as described above, the anchor bars 30, 31 communicate the reinforcing leg 22 with the base 4a, and the projection 25 provided on the lower end face of the reinforcing leg 22 is the upper surface of the base 4a. Fit with the recess 6 of the Therefore, even when an external force in the horizontal direction acts on the reinforced building 3 due to the occurrence of an earthquake or the like, a convex portion in which the shear force acting on the reinforcing column 21 is fitted to the anchor bars 30 and 31 It is transmitted to the base 4 a via the 25 and the recess 6. Therefore, even if the reinforcing leg portions 22 adjacent in the horizontal direction are not connected by the reinforcing beam portion, sufficient reinforcement of the piloti pillar 4c of the existing building 1 can be achieved. Therefore, it becomes possible to perform reinforcement of the existing building 1 simply and at low cost.

[Modification]
Although the embodiments according to the present disclosure have been described above in detail, various modifications may be added to the above embodiments within the scope of the present invention.

(1) For example, the reinforced building 3 may be configured by providing the reinforcing structure 2 to the existing building 1 not provided with the piloti 4.
(2) The lengths of the anchor bars 30, 31 extending in the reinforcing leg portion 22 can be made smaller as the compressive strength of the reinforcing member 22a is larger. For example, when the reinforcing member 22a is made of a hardened polymer cement mortar (compressive strength is 60 N / mm ² ), the reinforced member 22a is made of a hardened concrete (compressive strength is 35 N / mm ² ). In contrast, the length of the anchor bars 30, 31 extending in the reinforcing leg 22 can be approximately 0.76 times longer.

  (3) In the above embodiment, the recess 6 has a rectangular shape when viewed from above, but the shape of the recess 6 is not limited to this and may have various shapes. For example, the recess 6 may be circular when viewed from above.

  (4) The anchor bars 30 and 31 may be disposed in the reinforcing leg 22 and the foundation 4 a so as to pass through the recess 6 and the protrusion 25, or may be disposed so as not to pass through the recess 6 and the protrusion 25. You may arrange | position in the part 22 and the foundation 4a.

  (5) The recess 6 may be located at the central portion of the reinforcing leg 22 when viewed from above, or may be located near the periphery of the reinforcing leg 22 when viewed from above.

  (6) In the above embodiment, the size of the recess 6 when viewed from above is smaller than the size of the reinforcing leg 22, but may be about the same as the size of the reinforcing leg 22, or may be reinforced It may be larger than the size of the leg 22.

  (7) Although the one recessed part 6 was provided in the upper surface of the base 4a in the said embodiment, several recessed parts 6 may be provided in the upper surface of the base 4a. In this case, the lower end surface of the reinforcing leg portion 22 may be provided with a plurality of convex portions 25 respectively fitted to the respective concave portions 6. Since the reinforcement legs 22 and the foundation 4a are connected by the fitting of the plurality of recesses 6 and the plurality of projections 25, shear force acting on the reinforcement pillars 21 is more easily transmitted to the foundation 4a. Therefore, the piloti pillar 4c of the existing building 1 is further reinforced.

For example, as shown in FIG. 6, two recesses 6 may be provided on the upper surface of the base 4 a so that the piloti columns 4 c and the reinforcing legs 22 are aligned along the direction in which they are arranged. Here, temporarily, for the recess 61 (first recess) located closer to the reinforcing leg 22 and the recess 62 (second recess) located on the side farther from the reinforcing leg 22 than the recess 61 The shear force acts in the left direction of FIG. 6 from the convex portions 25 (first convex portion and second convex portion) fitted in the concave portions 61 and 62 respectively, and the concave portions 61 and 62 and the foundation 4 a It is assumed that the regions R1 and R2 between them are destroyed horizontally. Region R1 includes a pair of shear bands SB1 (first imaginary straight line) extending in the direction of 45.degree. From the corner portion P which is a stress concentration portion of the recess 61, the left outer peripheral edge 6a of the recess 61, and the foundation 4a. It is surrounded by the left outer peripheral edge 4f. Region R2 includes a pair of shear bands SB2 (second imaginary straight line) extending in the direction of 45.degree. From the corner P which is a stress concentration portion of the recess 62, the left outer peripheral edge 6a of the recess 62, and the foundation 4a. It is surrounded by the left outer peripheral edge 4f. Parameters A1, A2, B1, B2 and C, respectively A1: area of recess 61 when viewed from above A2: area of recess 62 when viewed from above B1: area of region R when viewed from above B2: The area of the region R2 when viewed from above C: When defined as the area of the overlapping portion of the region R1 and the region R2, (B1 + B2-C) / (A1 + A2) may be 1.0 or more, or 1 .2 or more may be sufficient and 1.4 or more may be sufficient. Also in this case, when the shear force is transmitted between the concave portions 61 and 62 and the convex portion 25, the foundation 4 a becomes extremely difficult to be damaged in the vicinity of the concave portions 61 and 62. The same applies to the case where three or more recesses 6 are arranged along the direction in which the piloti columns 4c and the reinforcing legs 22 are arranged.

Alternatively, for example, as shown in FIG. 7, two recesses 6 may be provided on the upper surface of the foundation 4 a so as to be aligned along the extending direction (horizontal direction) of the base beam 4 b and the reinforcing beam 23. . Here, temporarily, with respect to the recess 63 (second recess) located on the left side of FIG. 7 and the recess 64 (first recess) located on the right side, the protrusions fitted in the recesses 63 and 64 respectively When a shear force acts on the left direction of FIG. 7 from the portion 25 (the first convex portion and the second convex portion) and the regions R3 and R4 between the concave portions 63 and 64 and the foundation 4a are horizontally broken. Assume. The region R3 includes a pair of shear bands SB3 (third imaginary straight line) extending in the direction of 45 ° from the corner portion P which is a stress concentration portion of the recess 63, the left outer peripheral edge 6a of the recess 63, and the foundation 4a. It is surrounded by the left outer peripheral edge 4f. Region R4 includes a pair of shear bands SB4 (first imaginary straight line) extending in the direction of 45.degree. From the corner P which is a stress concentrated portion of the recess 64, the left outer peripheral edge 6a of the recess 64, and the recess 63. Virtual straight line SB5 (in a direction in which piloty column 4c and reinforcing leg 22 are aligned) in contact with right outer peripheral edge 6b located on recess 64 side and orthogonal to the extending direction of foundation beam 4b and reinforcing beam 23 It is constituted by being surrounded by two virtual straight lines). Parameters A3, A4, B3 and B4 are respectively A3: area of the recess 63 when viewed from above A4: area of the recess 64 when viewed from above B3: area of the region R3 when viewed from above B4: from above When defined as the area of the region R4 when viewed, (B3 + B4) / (A3 + A4) may be 1.0 or more, 1.2 or more, or 1.4 or more It is also good. Also in this case, when the shear force is transmitted between the concave portions 63 and 64 and the convex portion 25, the foundation 4 a becomes extremely difficult to be damaged in the vicinity of the concave portions 63 and 64. The same applies to the case where three or more recesses 6 are arranged along the extending direction (horizontal direction) of the base beam 4 b and the reinforcing beam portion 23.

  (8) As shown in FIG. 8, even if piloti 4 further includes foundation beams 4g extending along one direction (the width direction of the existing building 1 in FIG. 8) between adjacent foundations 4a. Good. In this case, since the piloti pillar 4c is reinforced by the presence of the reinforcing pillar portion 21 and the reinforcing leg portion 22, when an external force in the horizontal direction acts on the reinforced building due to the occurrence of an earthquake or the like, the foundation is better than the piloti pillar 4c. Beam 4g leads to destruction first. Therefore, in general, it is possible to exhibit the performance of the foundation beam 4g having a sufficient strength until the foundation beam 4g reaches breakage.

  (9) The orthogonal wall 4 h may not be provided to the existing building 1 in any of the above embodiment and the modification (8).

  DESCRIPTION OF SYMBOLS 1 ... existing building, 2 ... reinforcement structure, 3 ... reinforced building, 4 ... piloti, 4a ... foundation (base part), 4b ... foundation beam, 4c ... piloti pillar (column part), 4d ... piloti beam (beam section 4) Crossing part 6: Recessed part 21: Reinforcing column part 21b: Rebar, 22: Reinforcing leg part 23: Reinforcement beam part, 23b: Rebar, 24: Reinforcing cross part, 25: Convex part, 30, 31 ... anchor muscle.

Claims (18)

With existing buildings,
And a reinforcing structure for reinforcing the existing building,
The existing building is
The base section that contains rebar inside,
A column portion including a reinforcing bar inside and provided on the base portion;
Beams with rebar inside,
It has an intersection located at the intersection of the column and the beam and connected to the end of the column and the end of the beam, respectively.
The reinforcing structure is
A reinforcing pillar including a hardened concrete body disposed along the pillar and having a reinforcing bar embedded therein;
A reinforcing leg disposed along the column and connecting the reinforcing column and the base;
A reinforced beam portion including a hardened concrete body disposed along the beam portion and having a reinforcing bar embedded therein;
It has a reinforcement intersection which is disposed at a position corresponding to the intersection and which connects the end of the reinforcement column and the end of the reinforcement beam,
The reinforcing leg portion is a hardened body exhibiting a compressive strength higher than that of a concrete hardened body, and includes a hardened body in which a reinforcing bar is disposed,
The reinforcement intersection portion is a hardened body exhibiting a higher compressive strength than a concrete hardened body, and includes a hardened body in which a reinforcing bar is disposed,
Inside the reinforcement legs and the base portion, at least one anchor bar extending to communicate them is provided.
The upper surface of the base portion is provided with a recess which is recessed downward,
The lower end surface of the reinforcing leg portion is provided with a convex portion that protrudes downward,
The reinforced building in which the said recessed part and the said convex part are fitting.   The said reinforcement leg part and the said reinforcement intersection part are respectively comprised by the hardened | cured material which hardened | cured the polymer cement mortar, the hardened | cured material which hardened | cured the ultra high strength mortar, or the hardened | cured material which high strength concrete hardened. Reinforced building of. The reinforced building according to claim 1, wherein the compressive strength of the reinforcing leg and the reinforcing intersection at a material age of 28 days is 60 N / mm ² or more. The parameters l and t satisfy l / t ≧ 3.5 when they are defined as l: width of the recess in the extension direction of the beam portion and the reinforcing beam portion t: depth of the recess, respectively. The reinforced building according to any one of 3).   5. The reinforced building according to claim 4, wherein the depth t is 7 cm or less. Parameters A and B are respectively A: area of the recess when viewed from above B: the beam and the reinforcement so as to expand from the stress concentrated portion of the recess toward the outer peripheral edge of the base when viewed from the top When defined as the area of a region surrounded by a pair of imaginary straight lines extending at 45 ° with respect to the extending direction of the beam, the outer peripheral edge of the recess, and the outer peripheral edge of the base portion, B / A ≧ 1. The reinforced building as described in any one of Claims 1-5 which satisfy | fills 0. The upper surface of the base portion is provided with a first recess and a second recess which are recessed downward,
The lower end surface of the reinforcing leg portion is provided with a first convex portion and a second convex portion protruding downward.
The said 1st recessed part and the said 1st convex part fit, and the said 2nd recessed part and the said 2nd convex part are fitted in any one of Claims 1-5. Reinforced building of. The first and second recesses are arranged along a direction in which the column and the reinforcing column are arranged,
The first and second convex portions are arranged along a direction in which the column portion and the reinforcing column portion are arranged,
Parameters A1, B1, A2, B2, C are respectively A1: area of the first recess when viewed from above B1: outer peripheral edge of the base from a stress concentration portion of the first recess when viewed from the top The pair of first imaginary straight lines extending at 45 ° with respect to the extending direction of the beam portion and the reinforcing beam portion so as to expand toward the outer periphery of the first recess and the outer periphery of the base portion And A2: area of the second recess when viewed from above B2: extending from the stress concentration portion of the second recess to the outer peripheral edge of the base when viewed from above Area of the region surrounded by the pair of second imaginary straight lines extending at 45 ° with respect to the extending direction, the outer peripheral edge of the second recess, and the outer peripheral edge of the base portion C: region of area B1 When it is defined as the area of the overlapping portion of the area B2 and the area B2,
The reinforced building of Claim 7 which satisfy | fills (B1 + B2-C) / (A1 + A2)> = 1.0. The first and second recesses are arranged along the extending direction of the beam portion and the reinforcing beam portion.
The first and second convex portions are arranged along the extending direction of the beam portion and the reinforcing beam portion.
Parameters A1, B1, A2 and B2 respectively A1: area of the first recess when viewed from above B1: from the stress concentration portion of the first recess toward the second recess when viewed from the top A pair of first imaginary straight lines extending at 45 ° with respect to the extending direction so as to expand, an outer peripheral edge of the first recess, and an outer peripheral edge of the second recess closer to the first recess Area of a region which is in contact with and is surrounded by a second imaginary straight line perpendicular to the extending direction A2: Area of the second recess when viewed from above B2: stress of the second recess when viewed from above A pair of third imaginary straight lines extending at 45 ° with respect to the extending direction so as to expand from the concentrated portion toward the outer peripheral edge side of the base portion and the side away from the first recess, and the second recess And definition of the area surrounded by the outer periphery of the base and the outer periphery of the base portion In the case it was,
The reinforced building of Claim 7 which satisfy | fills (B1 + B2) / (A1 + A2)> = 1.0. Located at the intersection of a foundation including reinforcement within, a column including reinforcement inside and provided on the foundation, a beam including reinforcement inside, the column and the beam, and A reinforcing structure is provided in an existing building having an end of the column and an intersection respectively connected to the end of the beam to manufacture a reinforced building in which the existing building is reinforced by the reinforcing structure. Method,
A first step of providing a recess in the upper surface by turning the upper surface of the base portion;
After the first step, rebars are arranged at positions respectively corresponding to the column, the beam and the intersection, and the foundation so that the upper end of the anchor bar faces the lower end of the column A second step of embedding the anchor bar in the
After the second step, providing a first mold so as to cover the reinforcing bars and the anchor bars disposed in the column, and filling a first reinforcing material in the first mold. A third step of forming, at the lower end portion of the pillar portion, a reinforcing leg portion in which the upper end portion of the anchor bar is embedded.
After the third step, a fourth step of forming a reinforcement column by placing concrete in the first formwork;
After the second step, a second mold is provided so as to cover the reinforcing bar disposed in the beam, and concrete is cast in the second mold to form a reinforced beam. The fifth step,
After the fourth step, a third mold is provided to cover the reinforcing bar disposed at the intersection, and a reinforcing reinforcement is provided by filling the third reinforcement with a second reinforcing material. And the sixth step of forming
The reinforcing leg portion is a hardened body exhibiting a compressive strength equal to or higher than a hardened concrete body,
The reinforcement intersection portion is a hardened body exhibiting higher compressive strength than a concrete hardened body,
A reinforced portion is formed on the lower end surface of the reinforcing leg portion so as to project downward and be fitted with the concave portion by the first reinforcing material filled in the concave portion in the third step. How to make a building.   11. The method of claim 10, wherein the first and second reinforcing materials are each a polymer cement mortar, ultra high strength mortar or high strength concrete. The method according to claim 10, wherein a compressive strength of the reinforcing leg and the reinforcing intersection at a material age of 28 days is 60 N / mm ² or more. The parameters l and t satisfy l / t ≧ 3.5 when the width l of the recess in the extending direction of the beam portion and the reinforcing beam t is defined as the depth of the recess, respectively. 12. The method according to any one of 12.   The method according to claim 13, wherein the depth t is 7 cm or less. Parameters A and B are respectively A: area of the recess when viewed from above B: the beam and the reinforcement so as to expand from the stress concentrated portion of the recess toward the outer peripheral edge of the base when viewed from the top When defined as the area of a region surrounded by a pair of imaginary straight lines extending at 45 ° with respect to the extending direction of the beam, the outer peripheral edge of the recess, and the outer peripheral edge of the base portion, B / A ≧ 1. The method according to any one of claims 10 to 14, wherein 0 is satisfied. In the first step, a first recess and a second recess are provided on the upper surface by turning the upper surface of the base portion,
The first reinforcing material filled in the first and second recesses in the third step projects downward from the lower end surface of the reinforcing leg portion, and the first and second recesses and The method according to any one of claims 10 to 14, wherein a first projection and a second projection respectively fitted are formed. The first and second recesses are arranged along a direction in which the column and the reinforcing column are arranged,
The first and second convex portions are arranged along a direction in which the column portion and the reinforcing column portion are arranged,
Parameters A1, B1, A2, B2, C are respectively A1: area of the first recess when viewed from above B1: outer peripheral edge of the base from a stress concentration portion of the first recess when viewed from the top The pair of first imaginary straight lines extending at 45 ° with respect to the extending direction of the beam portion and the reinforcing beam portion so as to expand toward the outer periphery of the first recess and the outer periphery of the base portion And A2: area of the second recess when viewed from above B2: extending from the stress concentration portion of the second recess to the outer peripheral edge of the base when viewed from above Area of the region surrounded by the pair of second imaginary straight lines extending at 45 ° with respect to the extending direction, the outer peripheral edge of the second recess, and the outer peripheral edge of the base portion C: region of area B1 When it is defined as the area of the overlapping portion of the area B2 and the area B2,
The method according to claim 16, wherein (B1 + B2-C) / (A1 + A2) ≧ 1.0 is satisfied. The first and second recesses are arranged along the extending direction of the beam portion and the reinforcing beam portion.
The first and second convex portions are arranged along the extending direction of the beam portion and the reinforcing beam portion.
Parameters A1, B1, A2 and B2 respectively A1: area of the first recess when viewed from above B1: from the stress concentration portion of the first recess toward the second recess when viewed from the top A pair of first imaginary straight lines extending at 45 ° with respect to the extending direction so as to expand, an outer peripheral edge of the first recess, and an outer peripheral edge of the second recess closer to the first recess Area of a region which is in contact with and is surrounded by a second imaginary straight line perpendicular to the extending direction A2: Area of the second recess when viewed from above B2: stress of the second recess when viewed from above A pair of third imaginary straight lines extending at 45 ° with respect to the extending direction so as to expand from the concentrated portion toward the outer peripheral edge side of the base portion and the side away from the first recess, and the second recess And definition of the area surrounded by the outer periphery of the base and the outer periphery of the base portion In the case it was,
The method according to claim 16, wherein (B1 + B2) / (A1 + A2) ≧ 1.0 is satisfied.

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