JP7009161B2 - Reinforced building and its manufacturing method - Google Patents

Description

The present disclosure relates to a reinforced building in which an existing building is reinforced by a reinforced structure and a manufacturing method thereof.

Patent Document 1 discloses a reinforcing method for reinforcing an existing building by assembling concrete parts (precast concrete reinforcing unit) manufactured in advance in a factory or the like and integrating them with the outside (outer wall) of the existing building. When assembling these concrete parts, the horizontal PC steel material that inserts the concrete parts (reinforcing column unit) that will be the reinforcing columns and the concrete parts (reinforcing beam units) that will be the reinforcing beams is used to apply compressive stress (prestressed concrete) to them in advance. Prestress) is applied to improve the seismic performance of the reinforcement unit.

Japanese Unexamined Patent Publication No. 2005-155137

In the case of the reinforcement method using the reinforcement unit as disclosed in Patent Document 1, it becomes necessary to transport heavy concrete parts from the factory to the site. In addition, in the case of the reinforcement method, equipment for manufacturing the reinforcement unit and a process of applying prestress to the reinforcement unit are required. Therefore, the reinforcement method has become complicated and costly.

Therefore, the present disclosure describes a reinforced building and a manufacturing method thereof, which can easily and inexpensively reinforce an existing building.

[1] The reinforced building according to one aspect of the present disclosure includes an existing building and a reinforcing structure for reinforcing the existing building. The existing building is located at the intersection of the foundation part containing the reinforcing bar inside, the column part containing the reinforcing bar inside and provided on the foundation part, the beam part containing the reinforcing bar inside, and the column part and the beam part. It also has an intersection connected to the end of the column and the end of the beam, respectively. The reinforcing structure is arranged along the column portion and includes the reinforcing column portion including the concrete hardened body in which the reinforcing bar is embedded, and the reinforcing leg portion arranged along the column portion and connecting the reinforcing column portion and the foundation portion. , It is arranged along the beam part and is arranged at the position corresponding to the intersection with the reinforcing beam part including the concrete hardened body in which the reinforcing bar is embedded, and connects the end part of the reinforcing column part and the end part of the reinforcing beam part. Has a reinforcing intersection. The reinforcing leg portion is a hardened body having a compressive strength higher than that of a hardened concrete body, and includes a hardened body in which reinforcing bars are arranged inside. The reinforced intersection is a hardened body that exhibits higher compressive strength than a hardened concrete body, and includes a hardened body in which reinforcing bars are arranged inside. Inside the reinforcing legs and the foundation, at least one anchor bar extending so as to communicate them is provided. The upper surface of the foundation portion is provided with a recess that is recessed downward. The lower end surface of the reinforcing leg is provided with a convex portion that protrudes downward. The concave portion and the convex portion are fitted.

In the reinforced building according to one aspect of the present disclosure, at least one anchor bar communicates the reinforcing leg portion with the foundation portion, and the convex portion provided on the lower end surface of the reinforcing leg portion is the foundation portion. It fits into the recess on the top surface. Therefore, even when a horizontal external force acts on the reinforced building due to the occurrence of an earthquake or the like, the shearing force acting on the reinforcing column portion passes through the convex portion and the concave portion fitted to each other with the anchor bar. Is transmitted to the foundation. Therefore, even if the reinforcing legs adjacent to each other in the horizontal direction are not connected by the reinforcing beam portion, the pillar portion of the existing building can be sufficiently reinforced. As a result, it becomes possible to reinforce the existing building easily and at low cost.

[2] In the reinforced building described in paragraph 1 above, the reinforced legs and the reinforced intersections are hardened bodies obtained by hardening polymer cement mortar, hardened bodies obtained by hardening ultra-high strength mortar, or hardened concrete. It may be composed of a cured product. In this case, it is possible to further improve the earthquake resistance of the reinforced building.

[3] In the reinforced building according to the above item 1 or 2, the compressive strength of the reinforced legs and the reinforced intersections at the 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 set to l: the width of the recess in the extending direction of the beam portion and the reinforcing beam portion, respectively, t: the recess. When defined as depth, l / t ≧ 3.5 may be satisfied. In this case, when the shearing force is transmitted between the concave portion and the convex portion, the convex portion is extremely unlikely to be damaged.

[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, it becomes easy to form a recess in the foundation portion, and it is possible to prevent the reinforcing bar in the foundation portion from being exposed when the recess is formed in the foundation portion. In other words, when the recess is formed in the foundation portion, the reinforcing bar in the foundation portion is extremely unlikely to be damaged.

[6] In the reinforced building according to any one of the above items 1 to 5, the parameters A and B are A: the area of the concave portion when viewed from above B: the concave portion when viewed from the upper surface. A pair of virtual straight lines extending at 45 ° with respect to the extending direction of the beam part and the reinforcing beam part so as to extend from the stress concentration part toward the outer peripheral edge of the foundation part, the outer peripheral edge of the recess, and the outer peripheral edge of the foundation part. B / A ≧ 1.0 may be satisfied when defined as the area of the area surrounded by. In this case, when the shearing force is transmitted between the concave portion and the convex portion, the foundation portion is extremely unlikely to be damaged in the vicinity of the concave portion.

[7] In the reinforced building according to any one of the above items 1 to 5, the upper surface of the foundation portion is provided with a first recess and a second recess that are recessed downward. A first convex portion and a second convex portion that project downward are provided on the lower end surface of the reinforcing leg portion, and the first concave portion and the first convex portion are fitted to each other and the first convex portion is formed. The concave portion of 2 and the second convex portion may be fitted to each other. In this case, since the reinforcing leg portion and the foundation portion are connected by fitting the plurality of concave portions and the plurality of convex portions, the shearing force acting on the reinforcing column portion is more easily transmitted to the foundation portion. Therefore, the pillars of the existing building will be further reinforced.

[8] In the reinforced building according to the above item 7, the first and second recesses are lined up along the direction in which the columns and the reinforcing columns are lined up, and the first and second protrusions are the columns. And the reinforcing columns are lined up along the direction in which the reinforcing columns are lined up, and the parameters A1, B1, A2, B2, and C are respectively A1: the area of the first recess when viewed from above B1: the first when viewed from the top surface. A pair of first virtual straight lines extending at 45 ° with respect to the extending direction of the beam and the reinforcing beam so as to extend from the stress concentration portion of the recess toward the outer peripheral edge of the foundation, and the outer peripheral edge of the first recess. A2: Area of the second recess when viewed from above B2: From the stress concentration portion of the second recess to the outer peripheral edge of the foundation when viewed from above Area of the area surrounded by a pair of second virtual 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 foundation portion so as to expand toward C: Area B1. When defined as the area where the area and the area of area B2 overlap,
(B1 + B2-C) / (A1 + A2) ≧ 1.0 may be satisfied. In this case, when the shear force is transmitted between the first concave portion and the first convex portion and between the second concave portion and the second convex portion, the foundation portion is extremely close to each concave portion. It becomes difficult to break.

[9] In the reinforced building according to the above paragraph 7, the first and second recesses are lined up along the extending direction of the beam portion and the reinforcing beam portion, and the first and second convex portions are beams. The portions and the reinforcing beam portions are lined up along the extending direction, and the parameters A1, B1, A2, and B2 are arranged in A1: the area of the first recess when viewed from above. Of the pair of first virtual straight lines extending at 45 ° with respect to the extending direction so as to extend 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 the area adjacent to the outer peripheral edge near the first recess and surrounded by the second virtual straight line orthogonal to the extending direction A2: Area of the second recess when viewed from above B2: When viewed from the upper surface A pair of third virtual straight lines extending at 45 ° with respect to the extending direction so as to extend from the stress concentration portion of the second recess toward the outer peripheral edge side of the foundation portion and toward the side away from the first recess, and the second When defined as the area of the area surrounded by the outer peripheral edge of the recess and the outer peripheral edge of the foundation,
(B1 + B2) / (A1 + A2) ≧ 1.0 may be satisfied. In this case, when the shear force is transmitted between the first concave portion and the first convex portion and between the second concave portion and the second convex portion, the foundation portion is extremely close to each concave portion. It becomes difficult to break.

[10] The method for manufacturing a reinforced building according to another aspect of the present disclosure includes a foundation portion containing reinforcing bars inside, a pillar portion containing reinforcing bars inside and provided on the foundation portion, and reinforcing bars inside. An existing building is provided with a reinforcing structure by providing a reinforcing structure to an existing building having a beam portion and an intersection located at an intersection of the pillar portion and the beam portion and connected to the end portion of the pillar portion and the end portion of the beam portion, respectively. It is a method of manufacturing a reinforced building reinforced by a reinforced structure. In the manufacturing method, a first step of providing a recess on the upper surface by scraping the upper surface of the foundation portion, and after the first step, reinforcing bars are arranged at positions corresponding to the pillar portion, the beam portion and the intersection, respectively. In addition, a second step of burying the anchor bar in the foundation so that the upper end of the anchor bar faces the lower end of the column, and a reinforcing bar and an anchor bar arranged in the column after the second step. By providing a first formwork so as to cover the first formwork and filling the first formwork with the first reinforcing material, the upper end portion of the anchor bar is embedded inside the reinforcing leg portion and the lower end portion of the pillar portion. After the third step and the third step, the beam is formed after the fourth step and the second step of forming the reinforcing pillar portion by placing concrete in the first formwork. After the fifth step and the fourth step of forming a reinforcing beam portion by providing a second formwork so as to cover the reinforcing bars arranged in the portion and placing concrete in the second formwork. A sixth step of forming a reinforcing intersection by providing a third formwork so as to cover the reinforcing bars arranged at the intersection and filling the third formwork with the second reinforcing material. .. The reinforcing legs are hardened bodies that exhibit compressive strength higher than that of hardened concrete bodies. The reinforced intersection is a hardened body that exhibits higher compressive strength than the hardened concrete body. The first reinforcing material filled in the concave portion in the third step forms a convex portion that protrudes downward and fits with the concave portion on the lower end surface of the reinforcing leg portion. In this case, the same effect as that of the reinforced building described in the above paragraph 1 can be obtained.

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

[12] In the method according to the above item 10 or 11, the compressive strength of the reinforcing legs and the reinforcing intersections at the 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 above item 3 can be obtained.

[13] In the method according to any one of the above items 10 to 12, the parameters l and t are set to l: the width of the recess in the extending direction of the beam portion and the reinforcing beam portion, respectively, and t: the depth of the recess. If defined, l / t ≧ 3.5 may be satisfied. In this case, the same effect as that of the reinforced building described in the above item 4 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 above item 5 can be obtained.

[15] In the method according to any one of the above items 10 to 14, the parameters A and B are A: the area of the concave portion when viewed from above B: the stress concentration of the concave portion when viewed from the upper surface. Surrounded by a pair of virtual straight lines extending at 45 ° with respect to the extending direction of the beam and the reinforcing beam so as to extend from the portion to the outer peripheral edge of the foundation, the outer peripheral edge of the recess, and the outer peripheral edge of the foundation. B / A ≧ 1.0 may be satisfied when defined as the area of the area to be covered. 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 the above items 10 to 14, in the first step, the first recess and the second recess are formed on the upper surface by scraping the upper surface of the foundation portion. By the first reinforcing material provided and filled in the first convex portion and the second concave portion in the third step, the lower end surface of the reinforcing leg portion is projected downward and has the first and second concave portions. The first and second protrusions to be fitted may be formed, respectively. In this case, the same effect as that of the reinforced building described in the above item 7 can be obtained.

[17] In the method according to the above paragraph 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 reinforcing portion. The pillars are lined up along the direction in which the pillars are lined up, and the parameters A1, B1, A2, B2, and C are arranged in A1: the area of the first recess when viewed from above. A pair of first virtual straight lines extending at 45 ° with respect to the extending direction of the beam portion and the reinforcing beam portion so as to extend from the stress concentration portion toward the outer peripheral edge of the foundation portion, and the outer peripheral edge of the first recess. Area of area surrounded by the outer peripheral edge of the foundation A2: Area of the second recess when viewed from above B2: From the stress concentration portion of the second recess toward the outer peripheral edge of the foundation when viewed from above The area of the area surrounded by the pair of second virtual straight lines extending at 45 ° with respect to the extending direction so as to expand, the outer peripheral edge of the second recess, and the outer peripheral edge of the foundation C: the area of area B1. When defined as the area of the part where the area of area B2 overlaps,
(B1 + B2-C) / (A1 + A2) ≧ 1.0 may be satisfied. In this case, the same effect as that of the reinforced building described in the above item 8 can be obtained.

[18] In the method according to the above paragraph 16, 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 the beam portion and the reinforcing beam portion. The reinforcing beams are lined up along the extending direction, and the parameters A1, B1, A2, and B2 are arranged in A1: the area of the first recess when viewed from above. B1: The area of the first recess when viewed from above. A pair of first virtual straight lines extending at 45 ° with respect to the extending direction so as to extend 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 the area surrounded by the second virtual straight line that is in contact with the outer peripheral edge of the recess and is orthogonal to the extending direction A2: Area of the second recess when viewed from above B2: Second A pair of third virtual straight lines extending at 45 ° with respect to the extending direction so as to extend from the stress concentration portion of the concave portion to the outer peripheral edge side of the foundation portion and toward the side away from the first concave portion, and the second concave portion. When defined as the area of the area surrounded by the outer edge of the foundation and the outer edge of the foundation,
(B1 + B2) / (A1 + A2) ≧ 1.0 may be satisfied. 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 and the manufacturing method thereof according to the present disclosure, it is possible to reinforce an existing building easily and at low cost.

FIG. 1 is a perspective view schematically showing an example of a reinforced building in which a reinforced structure is constructed on an existing building having piloti. FIG. 2 is a front view mainly showing pilotis and reinforcing structures. FIG. 3 is a perspective view mainly showing the lower end portion of the column portion, the reinforcing leg portion, and the foundation portion. FIG. 4 is a plan view mainly showing the lower end portion of the column portion, the reinforcing leg portion, and the foundation portion. FIG. 5 is a sectional view taken along line VV of FIG. FIG. 6 is a plan view mainly showing the lower end portion of the column portion, the reinforcing leg portion, and the foundation portion in the reinforced building according to another example. FIG. 7 is a plan view mainly showing the lower end portion of the column portion, the reinforcing leg portion, and the foundation portion in the reinforced building according to another example. FIG. 8 is a perspective view schematically showing the reinforced building according to another example.

As the embodiments according to the present disclosure described below are examples for explaining the present invention, the present invention should not be limited to the following contents. In the following description, the same reference numerals will be used for the same elements or elements having the same function, and duplicate description will be omitted.

[Structure of reinforced building]
First, with reference to FIGS. 1 to 5, the structure of the reinforced building 3 in which the reinforced structure 2 is constructed on the existing building 1 will be described. The existing building 1 includes a piloti 4 located on the first floor (ground portion) and a superstructure 5 located above the piloti 4.

The piloti 4 has a foundation 4a (foundation portion), a foundation beam 4b, a piloti column 4c (column portion), a piloti 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 the load of the entire reinforced building 3 is transmitted 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 body. The compressive strength of the hardened concrete body in the existing building 1 at the age of 28 days may be, for example, 13.5 N / mm ² or more.

In the example of FIG. 1, the foundation 4a is arranged so as to line up along the outer circumference of the reinforced building 3. As shown in FIGS. 2 to 5, the upper surface of the foundation 4a is provided with a recess 6 that is recessed downward. The recess 6 is located in front of the piloti pillar 4c and has a quadrangular 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 pillar 4c is erected on the foundation 4a and extends along the vertical direction. The piloti pillar 4c connects the foundation 4a and the superstructure 5 and supports the superstructure 5. The upper end of the piloti column 4c is connected to the piloti beam 4d and also functions as an intersection 4e. The piloti beam 4d extends between adjacent piloti columns 4c. The piloti beam 4d supports the superstructure 5 together with the piloti column 4c. The orthogonal wall 4h is provided in an area surrounded by the foundation beam 4b, the piloti columns 4c arranged in the depth direction of the existing building 1, and the piloti beam 4d extending in the depth direction of the existing building 1.

[Structure of reinforced 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 crossing portion 24.

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

The reinforcing bar 21b is located away from the surface of the piloti column 4c. The reinforcing bar 21b has a plurality of main reinforcing bars 21c and a plurality of shear reinforcing bars 21d. The main bar 21c traverses the inside of the reinforcing column portion 21 so as to extend along the vertical direction. The main bars 21c are arranged apart from each other so as to form a rectangle in the reinforcing column portion 21 when viewed from the vertical direction.

The shear reinforcing bar 21d has a rectangular shape and is connected to the main bar 21c so as to surround the main bar 21c. The connection between the shear reinforcing bar 21d and the main bar 21c may be performed, for example, by welding or engaging using an engaging member such as a hook.

The lower end portion of the reinforcing column portion 21 also functions as the reinforcing leg portion 22. The reinforcing leg portion 22 is arranged on the surface side of the piloti column 4c and extends vertically along the lower end portion of the piloti column 4c. The reinforcing leg portion 22 is located above the recess 6. The reinforcing leg portion 22 is configured such that the reinforcing bar 21b is arranged in the reinforcing member 22a. A part of the reinforcing member 22a 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) that projects downward. The convex portion 25 is fitted with the concave portion 6 of the foundation 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 described later when compared at the same age. The reinforcing member 22a may be, for example, a hardened body obtained by hardening a polymer cement mortar, a hardened body obtained by hardening an ultra-high-strength mortar, or a hardened body obtained by hardening high-strength concrete (hardened high-strength concrete). It may be a body) or a hardened concrete (hardened concrete).

In the reinforcing member 22a, a plurality of anchor bars 30 and at least one anchor bar 31 are arranged in addition to the lower end portion of the reinforcing bar 21b. Similar to the main bar 21c, the plurality of anchor bars 30 are arranged apart from each other so as to form a rectangle in the reinforcing leg portion 22 when viewed from the vertical direction. The upper end of each of the plurality of anchor bars 30 is connected to the lower end of the corresponding main bar 21c.

At least one anchor bar 31 is located inside the plurality of anchor bars 30 when viewed from the vertical direction. In the present embodiment, one anchor bar 31 is located substantially in the center of the reinforcing leg portion 22 when viewed from the vertical direction so as to pass through the concave portion 6 and the convex portion 25. The upper end portion of the anchor bar 31 is arranged in the reinforcing member 22a in a state where it is not connected to any of the main bars 21c. The lower ends of the anchor muscles 30 and 31 are arranged in the foundation 4a. That is, the anchor muscles 30 and 31 communicate the reinforcing leg portion 22 and the foundation 4a.

The anchor bars 30 and 31 play a role of transmitting the vibration energy (for example, seismic energy) transmitted from the existing building 1 to the reinforcing structure 2 to the foundation 4a. The anchor bars 30 and 31 may be, for example, adhesive anchors. In this case, the epoxy resin-based or cement-based adhesive is filled in the holes with the lower ends of the anchor bars 30 and 31 inserted into the holes provided in the foundation 4a so as to extend in the vertical direction. As a result, the anchor muscles 30 and 31 are fixed to the foundation 4a. The anchoring length of the anchor muscles 30 and 31 to the foundation 4a is not particularly limited as long as the anchor muscles 30 and 31 can be sufficiently anchored to the foundation 4a, but is, for example, 12 times (12D) or more the diameter of the anchor muscles 30 and 31. It may be 16 times (16D) or more the diameter of the anchor muscles 30 and 31. The anchor muscles 30 and 31 may be, for example, SD345, SD295, SD420, SD280. In addition, SD345 and SD295 are based on JIS G 3112: 2010 "Reinforced concrete steel bars". SD420 and SD280 comply with CNS560 "National Standards of the Republic of China Reinforced Concrete Reinforcing Bars".

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

The reinforcing bar 23b is located away from the surface of the piloti beam 4d. The reinforcing bar 23b has a plurality of main reinforcing bars 23c and a plurality of shear reinforcing bars 23d. The main bar 23c traverses the inside of the reinforcing beam portion 23 so as to extend along the horizontal direction. The main bars 23c are arranged apart from each other so as to form a rectangle in the reinforcing beam portion 23 when viewed from the horizontal direction.

The shear reinforcing bar 23d has a rectangular shape and is connected to the main bar 23c so as to surround the main bar 23c. The connection between the shear reinforcing bar 23d and the main bar 23c may be performed by, for example, welding or engaging using an engaging member such as a hook.

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

The reinforcing crossing portion 24 is configured by arranging reinforcing bars 21b and 23b in the reinforcing member 24a. The compressive strength of the reinforcing member 24a may be larger than the compressive strength of the hardened concrete bodies 21a and 23a when compared at the same age. The reinforcing member 24a may be, for example, a hardened body obtained by hardening a polymer cement mortar, a hardened body obtained by hardening an ultra-high-strength mortar, or a hardened body obtained by hardening high-strength concrete (hardened high-strength concrete). It may be a body) or a hardened concrete (hardened concrete).

[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 destroyed when a shearing force acts from the convex portion 25 to the concave portion 6 due to the occurrence of an earthquake or the like. Here, as shown in FIG. 4, a shearing force acts from the convex portion 25 to the concave portion 6 in the left direction of FIG. 4, and the region R between the concave portion 6 and the foundation 4a is horizontally destroyed. Imagine a case. 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, the angle of 45 ° with respect to the extending direction (horizontal direction) of the foundation beam 4b and the reinforcing beam portion 23. A pair of virtual straight lines extending from the corner P toward the left outer peripheral edge 4f of the foundation 4a so as to spread from each other is the shear zone SB. Therefore, the region R is 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: Separation distance between the recess 6 and the left outer peripheral edge 4f (height of region R) [cm]
A: Area of recess 6 when viewed from above [cm ² ]
B: Area of region R when viewed from above [cm ² ]
F _c-ex : Compressive strength of the hardened concrete that constitutes the foundation 4a [kg / cm ² ]
F _c : Compressive strength of the reinforcing member 22a constituting the reinforcing leg portion 22 [kg / cm ² ]
Q _PA : Ultimate shear strength of region R [kg]
_RQ : Ultimate shear strength of convex portion 25 [kg]
When defined as, A, _B , Q _PA , and RQ are expressed by equations 1 to 4, respectively.
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 before the convex portion 25.

Therefore, by arranging equations 3 to 5 by A and B, equation 6 is obtained.

Therefore, the area A of the recess 6 and the area B of the region R may satisfy at least the formula 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。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、基礎４ａの領域Ｒが極めて破損し難くなる。 Below, when the typical F _c-ex value of the hardened concrete body constituting the foundation 4a and the typical F _c value of the reinforcing member 22a constituting the reinforcing leg portion 22 are substituted into the equation 6. The value of B / A is shown.

From Table 1, B / A ≧ 1.0, B / A ≧ 1.2, or B / A ≧ 1.4 may be used. In this case, when the shearing force is transmitted between the concave portion 6 and the convex portion 25, the region R of the foundation 4a is extremely unlikely to be damaged.

It is desirable that the convex portion 25 is not destroyed when a shearing force acts from the convex portion 25 to the concave portion 6 due to the occurrence of an earthquake or the like. Here, the parameters t and _RN are set to t: the depth of the recess 6 (see FIG. 5) [cm].
_RN : Axial force during mechanism [kg]
Then, _RN is expressed by the equation 7.
RN = t × b × _{0.8F 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 equation 8 is satisfied, the convex portion 25 is not sheared.

Therefore, by rearranging equations 1, 4, 7, and 8 by l and t, equation 9 is obtained.

Therefore, the width l and the depth t of the recess 6 may satisfy at least the formula 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。 Below, when the typical F _c-ex value of the hardened concrete body constituting the foundation 4a and the typical F _c value of the reinforcing member 22a constituting the reinforcing leg portion 22 are substituted into the equation 9. The value of l / t is shown.

From Table 2, l / t ≧ 3.5, l / t ≧ 4.5, or l / t ≧ 5.5 may be obtained. In this case, when the shearing force is transmitted between the concave portion 6 and the convex portion 25, the convex portion 25 is extremely unlikely 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, it becomes easy to form the recess 6 in the foundation 4a, and it is possible to suppress the exposure of the reinforcing bar in the foundation 4a when the recess 6 is formed in the foundation 4a. In other words, when the recess 6 is formed in the foundation 4a, the reinforcing bars in the foundation 4a are extremely unlikely to be damaged.

As shown in FIG. 5, the angle θ formed by 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 °. When the angle θ is within this range, the recess 6 having such an angle θ can be formed relatively easily.

[Reinforcement method of existing building (manufacturing method of reinforced building)]
Subsequently, with reference to FIG. 4, a method of constructing the reinforcing structure 2 on the existing building 1 to reinforce the existing building 1, that is, a method of manufacturing the reinforcing structure 2 will be described. First, the upper surface of the foundation 4a where the reinforcing leg portion 22 is to be provided is scraped to form the recess 6 (first step).

Next, anchor muscles 30 and 31 are provided for the foundation 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 order of installing the anchor bars 30 and 31 and the reinforcing bars 21b and 23b is not limited to this, and the anchor bars 30 and 31 may be provided on the foundation 4a after the reinforcing bars 21b and 23b are arranged. Next, the upper end of the anchor bar 30 is connected to the lower end of the main bar 21c.

Next, a formwork (first formwork) is configured so as to surround the lower end portion of the reinforcing bar 21b. Next, the reinforcing material (first reinforcing material) to be the reinforcing member 22a is filled in the formwork. The reinforcing material may be poured from the upper part of the formwork or may be press-fitted from the lower part of the formwork. By removing the formwork after the reinforcing material is cured, the reinforcing leg portion 22 is configured (third step).

Next, the formwork (first formwork) is configured so as to surround the portion of the reinforcing bar 21b below the intersection 4e. Next, concrete is placed in the formwork. By removing the formwork after the concrete is hardened, the reinforcing column portion 21 is configured (fourth step).

When the reinforcing column portion 21 and the reinforcing leg portion 22 are made of the same reinforcing material, a formwork (first formwork) is configured so as to surround the portion of the reinforcing bar 21b below the intersection 4e. Concrete may be placed in the formwork. In this case, by removing the formwork after the concrete is hardened, the reinforcing column portion 21 and the reinforcing leg portion 22 are simultaneously configured.

Next, the formwork (second formwork) is configured so as to surround the portion of the reinforcing bar 23b corresponding to the piloti beam 4d. Next, concrete is placed in the formwork. By removing the formwork after the concrete is hardened, the reinforcing beam portion 23 is configured (fifth step).

Next, the formwork (third formwork) is configured so as to surround the portion of the reinforcing bars 21b and 23b corresponding 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 upper part of the formwork or may be press-fitted from the lower part of the formwork. By removing the formwork after the reinforcing material is cured, the reinforcing intersection 24 is configured (sixth step).

In this way, the reinforcing structure 2 composed of the reinforcing column portion 21, the reinforcing leg portion 22, the reinforcing beam portion 23, and the reinforcing intersection portion 24 is obtained. As a result, the reinforcing 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 Next, 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 a reinforcing method, and is a cement, a fine aggregate, a fluidizing agent, a re-emulsified powder resin, an inorganic expansion material, and a synthetic resin fiber. Contains.

Cement is a common 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 fluidity and quick hardening, it is more preferable to contain early-strength Portland cement.

From the viewpoint of strength development, the brain specific surface area of cement is
It is preferably 3000 cm ² / g to 6000 cm ² / g.
More preferably, it is 3300 cm ² / g to 5000 cm ² / g.
More preferably, it is 3500 cm ² / g to 4500 cm ² / g.

Examples of the fine aggregate include sands such as silica sand, river sand, land sand, sea sand and crushed sand. As the fine aggregate, one selected from these can be used alone or in combination of two or more. Of these, it is preferable to contain silica sand from the viewpoint of further smoothing the filling property of the polymer cement mortar into the formwork.

When the fine aggregate is sifted by the method specified in JIS A 1102: 2014 "Aggregate Sieveing Test Method", the mass fraction (%) remaining between each continuous sieve is 0 at a sieving opening of 2000 μm. It is preferably by mass%. When all the fine aggregates pass through a sieve having a sieve opening of 2000 μm, the mass fraction is 0% by mass.

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

When the fine aggregate is sifted according to the above regulations, the mass fraction (%) that remains between each continuous sieve is within the above range, so that mortar having better material separation resistance and fluidity can be used. A cured mortar having a higher compressive strength can be obtained.

When the fine aggregate is screened by the method specified in JIS A 1102: 2014 "Aggregate Sifting Test Method", the coarse grain ratio of the fine aggregate is preferably 2.00 to 3.00.
More preferably, it is 2.20 to 2.80.
More preferably, it is 2.30 to 2.70.

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

The above sieving can be performed using several sieves having different meshes specified in JIS Z 8801-1: 2006 "Test Sieve-Part 1: Metal Net Sieve".

The content of fine aggregate is 100 parts by mass of cement.
It is preferably 80 parts by mass to 170 parts by mass, and is preferably 80 parts by mass to 170 parts by mass.
It is more preferably 90 parts by mass to 160 parts by mass, and is more preferably 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 range, a cured mortar having a higher compressive strength can be obtained.

Examples of the fluidizing agent include formaldehyde condensates of melamine sulfonic acid, casein, casein calcium, and polycarboxylic acid-based ones. As the fluidizing agent, one selected from these can be used alone or in combination of two or more. Of these, it is preferable to include a polycarboxylic acid-based fluidizing agent from the viewpoint of obtaining a high water-reducing effect. By using a polycarboxylic acid-based 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 100 parts by mass of cement.
It is preferably 0.02 part by mass to 0.70 part by mass, and is preferably 0.02 part by mass to 0.70 part by mass.
More preferably, it is 0.05 part by mass to 0.65 part by mass, and is
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. Further, a cured mortar having a higher compressive strength can be obtained.

The type and production method of the re-emulsified powder resin are not particularly limited, and those produced by a known production method can be used. Examples of the re-emulsified powder resin include a polyacrylic acid ester resin type, a styrene butadiene synthetic rubber type, and a vinyl acetate beova acrylic copolymer type. As the re-emulsified powder resin, one selected from these can be used alone or in combination of two or more. Further, the re-emulsified powder resin may have a blocking inhibitor on the surface. From the viewpoint of the durability of the cured mortar, the re-emulsified powder resin preferably contains acrylic. Further, from the viewpoint of adhesiveness and compressive strength, the glass transition temperature (Tg) of the re-emulsified powder resin is preferably in the range of 5 to 20 ° C.

The content of the re-emulsified powder resin is 100 parts by mass of cement.
It is preferably 0.5 parts by mass to 5.0 parts by mass, and is preferably 0.5 parts by mass.
More preferably, it is 0.7 parts by mass to 4.0 parts by mass.
More preferably, it is 1.0 part by mass to 3.0 part by mass.

By setting the content of the re-emulsified powder resin in the above range, it is possible to achieve both the adhesiveness of the polymer cement mortar and the compressive strength of the cured mortar at a higher level.

Examples of the inorganic swelling material include quick lime-gypsum-based swelling material, gypsum-based swelling material, calcium sulfate-based swelling material, and quick lime-gypsum-calcium sulphoaluminate-based swelling material. As the inorganic expansion material, one selected from these can be used alone or in combination of two or more. Of these, from the viewpoint of further improving the compressive strength of the cured mortar, it is preferable to include a quicklime-gypsum-calcium sulphoaluminate-based expansion material.

The content of the inorganic expansion material is 100 parts by mass of cement.
It is preferably 0.1 part by mass to 7.0 parts by mass, and is preferably 0.1 part 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 expansion material in the above range, more appropriate expansion property can be exhibited, shrinkage of the cured mortar can be suppressed, and the compressive strength of the cured mortar can be further increased. can.

Examples of the synthetic resin fiber include polyethylene, ethylene-vinyl acetate copolymer (EVA), polyolefin such as polypropylene, polyester, polyamide, polyvinyl alcohol, vinylon, polyvinyl chloride and the like. As the synthetic resin fiber, one selected from these can be used alone or in combination of two or more.

The fiber length of the synthetic resin fiber is determined from the viewpoint of dispersibility in the mortar and improvement of crack resistance of the cured mortar.
It is preferably 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.
It is preferably 0.10 parts by mass to 0.70 parts by mass, and is preferably 0.10 parts by mass.
It is more preferably 0.20 part by mass to 0.60 part by mass, and is more preferably 0.20 part by mass to 0.60 part 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 range, the dispersibility in the mortar and the crack resistance of the cured mortar can be further improved. That is, the presence of the synthetic resin fiber can suppress the cracking of the cured mortar and improve the bending strength of the cured mortar. In addition, the drying shrinkage during curing is reduced, and the period until the strength of the cured mortar is developed can be shortened. Therefore, the construction period can be shortened.

The polymer cement composition of the present embodiment may contain a coagulation adjuster, a thickener, a metal-based swelling agent, an antifoaming agent, and the like, depending on the intended use.

(2) Polymer cement mortar The polymer cement mortar contains the above-mentioned polymer cement composition and water. The polymer cement mortar can be prepared by mixing and kneading the above-mentioned polymer cement composition with water. The polymer cement mortar prepared in this way has excellent fluidity (flow value). Therefore, it is possible to smoothly fill (pour) into the formwork for forming the reinforcing structure 2. Therefore, it can be suitably used as a polymer cement mortar for manufacturing 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 (water amount / polymer cement composition amount).

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

By setting the water powder ratio within the above range, the polymer cement mortar before curing exhibits good fluidity, and the cured mortar obtained by curing the polymer cement mortar exhibits sufficient strength. Therefore, the existing building 1 can be sufficiently reinforced by the cured mortar.

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

The flow value of polymer cement mortar is
It is preferably 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 range, a polymer cement mortar having excellent material separation resistance and filling property can be obtained. In addition, the fluidity of the polymer cement mortar before curing can be ensured.

(3) Hardened mortar The hardened mortar can be formed by curing the above-mentioned polymer cement mortar. The hardened mortar formed in this way has excellent strength development when integrated with the concrete forming the lower end portion or the intersection portion 4e of the piloti pillar 4c. Therefore, the construction period of the reinforcement method can be shortened. Further, since it has excellent strength characteristics and excellent durability, it is possible to improve the seismic resistance of the existing building 1.

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 of the cured mortar at 28 days as measured by the above test method is
It is preferably 60 N / mm ² or more, and is
More preferably, it is 70 N / mm ² or more.
The compressive strength of the cured mortar after 28 days of age is also preferably in the above range.

When the compressive strength is within the above range, even better seismic performance can be exhibited when the piloti pillar 4c is integrated with the concrete forming the lower end portion or the intersection portion 4e.

[Details of ultra-high-strength mortar]
Next, the ultra-high-strength mortar will be described. An example of an ultra-high-strength mortar is a mortar composition produced by adding fibers and water to a hydraulic composition containing cement, silica fume, fine aggregate, inorganic fine powder, a water reducing agent and a defoaming agent.

Regarding the mineral composition of the above cement, the amount of _C3S is
It is preferably 40.0% by mass to 75.0% by mass, and is preferably 40.0% by mass.
It is more preferably 45.0% by mass to 73.0% by mass, and is more preferably 45.0% by mass to 73.0% by mass.
It is more preferably 48.0% by mass to 70.0% by mass, and is more preferably 48.0% by mass to 70.0% by mass.
Particularly preferably, it is 50.0% by mass to 68.0% by mass.

If the amount of C _3S 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 to bake.

Regarding the mineral composition of the above cement, the amount of _C3A is
It is preferably less than 2.7% by weight.
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 _C3A is 2.7% by mass or more, the fluidity tends to be insufficient. The lower limit of the amount of _C3A is not particularly limited, but is about 0.1% by mass.

Regarding the mineral composition of the above cement, the amount of _C 2S is
It is preferably 9.5% by mass to 40.0% by mass, and is preferably 9.5% by mass to 40.0% by mass.
More preferably, it is 10.0% by mass to 35.0% by mass, and is
More preferably, it is 12.0% by mass to 30.0% by mass.

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

Within the range of the mineral composition of such cement, it becomes easy to secure high fluidity of the mortar composition and high compressive strength of the cured product thereof.

Regarding the grain size of cement, the upper limit of the 45 μm sieve residue is
It is preferably 25.0% by mass, and is 25.0% by mass.
More preferably, it is 20.0% by mass,
More preferably, it is 18.0% by mass, which is 18.0% by mass.
Particularly preferably, it is 15.0% by mass.

Regarding the grain size of cement, the lower limit of the 45 μm sieve residue is
It is preferably 0.0% by mass, and is
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 grain size of the cement is in this range, high compressive strength can be ensured. Further, since the slurry prepared using this cement has an appropriate viscosity, sufficient dispersibility can be ensured even when the fibers described later are added.

The brain specific surface area of cement is
It is preferably 2500 cm ² / g to 4800 cm ² / g.
More preferably, it is 2800 cm ² / g to 4000 cm ² / g.
More preferably, it is 3000 cm ² / g to 3600 cm ² / g.
Particularly preferably, it is 3200 cm ² / g to 3500 cm ² / g.

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

In the production of the above cement, it is not necessary to perform an operation different from that of ordinary cement. The above cement is changed according to the mineral composition to be mixed with raw materials such as limestone, silica stone, slag, coal ash, construction soil, blast furnace dust, etc., fired in the actual kiln, and then gypsum is added to the obtained clinker. It can be produced by pulverizing to a predetermined particle size. A general NSP kiln, SP kiln, or the like can be used for the kiln to be fired, and a crusher such as a general ball mill can be used for crushing. Further, if necessary, two or more kinds of cement can be mixed.

The silica fume is a by-product obtained by collecting dust in exhaust gas generated during the production of metallic silicon, ferrosilicon, fused zirconia, etc., and the main component is an amorphous substance that dissolves in an alkaline solution. It is SiO ₂ .

The average particle size of silica fume is
It is preferably 0.05 μm to 2.0 μm, and is preferably 0.05 μm to 2.0 μm.
It is more preferably 0.10 μm to 1.5 μm, and is more preferably 0.10 μm to 1.5 μm.
It is more preferably 0.18 μm to 0.28 μm, and is more preferably 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 secure high fluidity of the mortar composition and high compressive strength of the cured product thereof.

In the above mortar composition, silica fume is used as a reference based on the total amount of cement and silica fume.
It preferably contains 3% by mass to 30% by mass, and 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 is 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. Oxidized slag fine aggregate or the like may be used. The water absorption rate of the fine aggregate is preferably 5.00% or less, more preferably 4.00% or less, still more preferably 3.00% or less, and particularly preferably 2.80% or less. .. This makes it possible to obtain more stable liquidity. The "water absorption rate" refers to a value measured according to the method for measuring the water absorption rate (unit:%) of the aggregate specified in JIS A 1109: 2006. Further, it is preferable that the particle size of the fine aggregate passes through the entire 10 mm sieve and 85% by mass or more through the 5 mm sieve.

Moreover, the amount of fine aggregate in the mortar composition containing no fiber is
100 kg / m ³ to 800 kg / m ³ is preferable.
200 kg / m ³ to 600 kg / m ³ is more preferable.
250 kg / m ³ to 500 kg / m ³ is more preferable.

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

The brain specific surface area of the fine inorganic powder is
It is preferably 3000 cm ² / g to 5000 cm ² / g.
More preferably, it is 3200 cm ² / g to 4500 cm ² / g.
More preferably, it is 3400 cm ² / g to 4300 cm ² / g.
Particularly preferably, it is 3600 cm ² / g to 4300 cm ² / g.

The mixture of fine aggregate and fine inorganic powder has a grain group with a particle size of 0.15 mm or less.
It preferably contains 40% by mass to 80% by mass, and 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 a group of grains having a particle size of 0.075 mm or less.
It preferably contains 30% by mass to 80% by mass, and contains 30% by mass to 80% by mass.
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 fine inorganic powder is less than 30% by mass, the viscosity of the mortar composition may be insufficient and the material may be separated.

The mixture of fine aggregate and fine inorganic powder is based on 100 parts by mass of the total amount of cement and silica fume.
It preferably contains 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, it contains 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, it contains 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.

In addition, the unit amount of the mixture of fine aggregate and inorganic fine powder per 1 m ³ of fiber-free mortar composition is
It is preferably 200 kg / m ³ to 1000 kg / m ³ .
More preferably, it is 400 kg / m ³ to 900 kg / m ³ .
More preferably, it is 500 kg / m ³ to 800 kg / m ³ .

As the water reducing agent, a lignin-based, naphthalene sulfonic acid-based, aminosulfonic acid-based, polycarboxylic acid-based water reducing agent, a high-performance water reducing agent, a high-performance AE water reducing agent, or the like may be used. From the viewpoint of ensuring 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 the water reducing agent, or a polycarboxylic acid-based high-performance water reducing agent may be used. Agents may be used. Further, in order to obtain a premix type mortar composition in which the water reducing agent is premixed, the properties of the water reducing agent are preferably powder.

The mortar composition preferably contains 0.01 parts by mass to 6.0 parts by mass of a water reducing agent with respect to 100 parts by mass of the total amount of cement and silica fume.
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.
Particularly preferably, it contains 0.10 parts by mass to 2.0 parts by mass.

Examples of the defoaming agent include a special nonionic surfactant, a polyalkylene derivative, hydrophobic silica, and a polyether type. In this case, the mortar composition contains an antifoaming agent for 100 parts by mass of the total amount of cement and silica fume.
It preferably contains 0.01 parts by mass to 2.0 parts by mass.
More preferably, it contains 0.02 parts by mass to 1.5 parts by mass.
More preferably, it contains 0.03 part by mass to 1.0 part by mass.

If necessary, the mortar composition may contain one or more swelling material, shrinkage reducing agent, coagulation accelerator, coagulation retarder, thickener, re-emulsified resin powder, 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.
It is preferably 10 parts by mass to 25 parts by mass, and is preferably 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 fiber-free mortar composition is
It is preferably 180 kg / m ³ to 280 kg / m ³ .
More preferably, it is 200 kg / m ³ to 270 kg / m ³ .
More preferably, it is 210 kg / m ³ to 260 kg / m ³ .

The mortar composition (ultra-high strength mortar) contains fibers as described above. Examples of the fiber include organic fiber and inorganic fiber. Examples of the organic fiber include polypropylene fiber, polyethylene fiber, vinylon fiber, acrylic fiber, nylon fiber and the like. Examples of the inorganic fiber include glass fiber and carbon fiber.

The standard fiber length of the fiber is
It is preferably 2 mm to 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 cutting elongation of the fiber is
It is preferably 200% or less,
More preferably, it is 100% or less.
More preferably, it is 50% or less,
It is particularly preferably 30% or less.

The lower limit of the cutting elongation of the fiber is preferably 1% or more.

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

The fiber aspect ratio (standard fiber length / fiber diameter) is
It is preferably 5 to 1200, and is
More preferably, it is 10 to 600, and is
More preferably, it is 20 to 300.
Particularly preferably, it is 30 to 200.

By using fibers that satisfy these conditions, high fluidity of the mortar composition can be ensured, and fire resistance can be improved. In addition, it is possible to suppress defects such as corner defects due to impact.

The amount of fiber added is divided by the amount of the fiber-free mortar composition.
It is preferably 0.05% by volume to 4% by 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.

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

The method for producing the above mortar composition is not particularly limited, but it is produced by mixing a part or all of materials other than water and organic fibers in advance, then adding water, putting it in a mixer, and kneading it. You may. The mixer used for kneading the mortar composition is not particularly limited, and a mortar mixer, a biaxial forced kneading mixer, a pan-type mixer, a grout mixer, or the like may be used. As the mortar composition, a room temperature curing type may be adopted so that standard heat treatment does not have to be performed on site.

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

[Details of high-strength concrete]
Next, the details of the high-strength concrete will be described. The high-strength concrete conforms to the high-strength concrete described in JIS A 5308: 2014 "Ready-mixed concrete" and contains cement, aggregate, admixture material and water.

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

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” Annex A “Aggregate for ready-mixed concrete”.

The maximum size of crushed stone and gravel is preferably 25 mm or less, more preferably 20 mm or less.

The 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 "Protection for concrete". Fly ash, swelling material, chemical admixture, antiseptic, blast furnace slag fine powder specified in JIS A 6206: 2013 "Concrete blast furnace slag fine powder" and JIS A 6207: 2016 "Silica fume for concrete". And at least one selected from silica fumes is preferred.

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

The amount of air in the high-strength concrete is preferably 3.0% to 6.0%.

The compressive strength of the hardened concrete made of high-strength concrete at the age of 28 days is preferably 50 N / mm ² or more, more preferably 55 N / mm ² or more, and even more preferably 60 N / mm ² or more.

[Action]
In the present embodiment as described above, the anchor bars 30 and 31 communicate the reinforcing leg portion 22 and the foundation 4a, and the convex portion 25 provided on the lower end surface of the reinforcing leg portion 22 is the upper surface of the foundation 4a. It is fitted with the recess 6 of. Therefore, even when a horizontal external force acts on the reinforced building 3 due to the occurrence of an earthquake or the like, the shearing force acting on the reinforcing column portion 21 is a convex portion fitted with the anchor bars 30 and 31. It is transmitted to the foundation 4a via the 25 and the recess 6. Therefore, even if the reinforcing legs 22 adjacent to each other in the horizontal direction are not connected by the reinforcing beam portions, the piloti columns 4c of the existing building 1 can be sufficiently reinforced. Therefore, it is possible to reinforce the existing building 1 easily and at low cost.

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

(1) For example, the reinforced building 3 may be configured by providing the reinforced structure 2 to the existing building 1 that does not have the piloti 4.
(2) The lengths of the anchor bars 30 and 31 extending in the reinforcing leg portion 22 can be reduced as the compressive strength of the reinforcing member 22a is increased. For example, when the reinforcing member 22a is composed of a cured polymer cement mortar (compressive strength of 60 N / mm ² ) and the reinforcing member 22a is composed of a hardened concrete body (compressive strength of 35 N / mm ² ). On the other hand, the lengths of the anchor muscles 30 and 31 extending in the reinforcing leg portion 22 can be increased by about 0.76 times.

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

(4) The anchor bars 30 and 31 may be arranged in the reinforcing leg portion 22 and the foundation 4a so as to pass through the concave portion 6 and the convex portion 25, or the reinforcing legs may be arranged so as not to pass through the concave portion 6 and the convex portion 25. It may be arranged in the portion 22 and the foundation 4a.

(5) The recess 6 may be located at the central portion of the reinforcing leg portion 22 when viewed from above, or may be located near the peripheral edge of the reinforcing leg portion 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 portion 22, but it may be about the same as the size of the reinforcing leg portion 22 or is reinforced. It may be larger than the size of the leg portion 22.

(7) In the above embodiment, one recess 6 is provided on the upper surface of the foundation 4a, but a plurality of recesses 6 may be provided on the upper surface of the foundation 4a. In this case, the lower end surface of the reinforcing leg portion 22 may be provided with a plurality of convex portions 25 that fit each of the concave portions 6. Since the reinforcing leg portion 22 and the foundation 4a are connected by fitting the plurality of concave portions 6 and the plurality of convex portions 25, the shearing force acting on the reinforcing column portion 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 foundation 4a so as to be arranged along the direction in which the piloti columns 4c and the reinforcing legs 22 are arranged. Here, tentatively, with respect to the recess 61 (first recess) located closer to the reinforcing leg portion 22 and the recess 62 (second recess) located closer to the reinforcing leg 22 than the recess 61. , Shear force acts from the convex portions 25 (first convex portion and second convex portion) fitted in the concave portions 61 and 62 to the left in FIG. 6, and the concave portions 61 and 62 and the foundation 4a It is assumed that the regions R1 and R2 between them are horizontally destroyed. The region R1 is a pair of shear bands SB1 (first virtual straight line) extending in a direction of 45 ° from the corner portion P which is the 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. The region R2 is a pair of shear bands SB2 (second virtual straight line) extending in a direction of 45 ° from the corner portion P which is the 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, C respectively A1: Area of recess 61 when viewed from above A2: Area of recess 62 when viewed from above B1: Area of region R1 when viewed from above B2: Area of region R2 when viewed from above C: When defined as the area of the portion where region R1 and region R2 overlap, (B1 + B2-C) / (A1 + A2) may be 1.0 or more, or 1 It may be .2 or more, or 1.4 or more. Also in this case, when the shearing force is transmitted between the concave portions 61 and 62 and the convex portion 25, the foundation 4a is extremely unlikely 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 4a so as to line up along the extending direction (horizontal direction) of the foundation beam 4b and the reinforcing beam portion 23. .. Here, tentatively, with respect to the concave portion 63 (second concave portion) located on the left side of FIG. 7 and the concave portion 64 (first concave portion) located on the right side, the convex portions fitted in the concave portions 63 and 64, respectively. When a shearing force acts from the portion 25 (the first convex portion and the second convex portion) to the left in FIG. 7, and the regions R3 and R4 between the concave portions 63 and 64 and the foundation 4a are horizontally broken. Is assumed. The region R3 is a pair of shear bands SB3 (third virtual straight line) extending in a direction of 45 ° from the corner portion P which is the 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. The region R4 is a pair of shear bands SB4 (first virtual straight line) extending in a direction of 45 ° from the corner portion P which is the stress concentration portion of the recess 64, the left outer peripheral edge 6a of the recess 64, and the recess 63. A virtual straight line SB5 (No. 1) that is in contact with the right outer peripheral edge 6b located on the concave portion 64 side and extends in a direction orthogonal to the extending direction of the foundation beam 4b and the reinforcing beam portion 23 (the direction in which the Piloti pillar 4c and the reinforcing leg portion 22 are lined up). It is surrounded by 2 virtual straight lines). Parameters A3, A4, B3, B4 respectively A3: Area of recess 63 when viewed from above A4: Area of recess 64 when viewed from above B3: Area of region R3 when viewed from above B4: From above When defined as the area of the area R4 when viewed, (B3 + B4) / (A3 + A4) may be 1.0 or more, 1.2 or more, or 1.4 or more. May be good. Also in this case, when the shearing force is transmitted between the concave portions 63 and 64 and the convex portion 25, the foundation 4a is extremely unlikely 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 lined up along the extending direction (horizontal direction) of the foundation beam 4b and the reinforcing beam portion 23.

(8) As shown in FIG. 8, even if the piloti 4 further includes a foundation beam 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 column 4c is reinforced by the presence of the reinforcing column 21 and the reinforcing leg 22, when a horizontal external force acts on the reinforced building due to the occurrence of an earthquake or the like, the foundation is more basic than the piloti column 4c. The beam 4g is destroyed first. Therefore, in general, it is possible to exert the performance of the foundation beam 4g having a margin in strength until the foundation beam 4g is destroyed.

(9) In any of the above-described embodiment and modification (8), the existing building 1 may not be provided with the orthogonal wall 4h.

1 ... Existing building, 2 ... Reinforced structure, 3 ... Reinforced building, 4 ... Piloti, 4a ... Foundation (foundation part), 4b ... Foundation beam, 4c ... Piloti pillar (column part), 4d ... Piloti beam (beam part) ), 4e ... intersection, 6 ... concave, 21 ... reinforcing column, 21b ... reinforcing bar, 22 ... reinforcing leg, 23 ... reinforcing beam, 23b ... reinforcing bar, 24 ... reinforcing crossing, 25 ... convex, 30, 31 ... Anchor muscle.

Claims (14)

With existing buildings
It is equipped with a reinforcing structure that reinforces the existing building.
The existing building
The foundation that contains the reinforcing bars inside, and
Pillars that include reinforcing bars inside and are provided on the foundation,
The beam part including the reinforcing bar inside and
It has an intersection located at an intersection of the pillar and the beam and connected to the end of the pillar and the end of the beam, respectively.
The reinforcing structure is
Reinforcing column portions containing a hardened concrete body arranged along the column portions and having reinforcing bars embedded in them, and
A reinforcing leg portion that is arranged along the pillar portion and connects the reinforcing pillar portion and the foundation portion, and a reinforcing leg portion.
Reinforcing beam parts including a hardened concrete body arranged along the beam part and having reinforcing bars embedded in them, and
It has a reinforcing intersection that is arranged at a position corresponding to the intersection and connects the end of the reinforcing column portion and the end of the reinforcing beam portion.
The reinforcing leg portion is a hardened body having a compressive strength higher than that of a hardened concrete body, and includes a hardened body in which reinforcing bars are arranged inside.
The reinforcing intersection is a hardened body that exhibits higher compressive strength than a hardened concrete body, and includes a hardened body in which reinforcing bars are arranged inside.
At least one anchor bar extending so as to communicate these is provided inside the reinforcing leg portion and the foundation portion.
The upper surface of the foundation 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 concave portion and the convex portion are fitted to each other, and the concave portion and the convex portion are fitted to each other.
Parameters A and B respectively
A: Area of the recess when viewed from above
B: A pair of virtual straight lines extending at 45 ° with respect to the extending direction of the beam portion and the reinforcing beam portion so as to extend from the stress concentration portion of the recess toward the outer peripheral edge of the foundation portion when viewed from the upper surface. , The area of the area surrounded by the outer peripheral edge of the recess and the outer peripheral edge of the foundation portion.
When defined as
Reinforced building that meets B / A ≧ 1.0 . With existing buildings
It is equipped with a reinforcing structure that reinforces the existing building.
The existing building
The foundation that contains the reinforcing bars inside, and
Pillars that include reinforcing bars inside and are provided on the foundation,
The beam part including the reinforcing bar inside and
It has an intersection located at an intersection of the pillar and the beam and connected to the end of the pillar and the end of the beam, respectively.
The reinforcing structure is
Reinforcing column portions containing a hardened concrete body arranged along the column portions and having reinforcing bars embedded in them, and
A reinforcing leg portion that is arranged along the pillar portion and connects the reinforcing pillar portion and the foundation portion, and a reinforcing leg portion.
Reinforcing beam parts including a hardened concrete body arranged along the beam part and having reinforcing bars embedded in them, and
It has a reinforcing intersection that is arranged at a position corresponding to the intersection and connects the end of the reinforcing column portion and the end of the reinforcing beam portion.
The reinforcing leg portion is a hardened body having a compressive strength higher than that of a hardened concrete body, and includes a hardened body in which reinforcing bars are arranged inside.
The reinforcing intersection is a hardened body that exhibits higher compressive strength than a hardened concrete body, and includes a hardened body in which reinforcing bars are arranged inside.
At least one anchor bar extending so as to communicate these is provided inside the reinforcing leg portion and the foundation portion.
The upper surface of the foundation portion is provided with a first recess and a second recess that are recessed downward.
A first convex portion and a second convex portion that project downward are provided on the lower end surface of the reinforcing leg portion.
The first concave portion and the first convex portion are fitted, and the second concave portion and the second convex portion are fitted.
The first and second recesses are lined up along the direction in which the pillar portion and the reinforcing pillar portion are lined up.
The first and second convex portions are arranged along the direction in which the pillar portion and the reinforcing pillar portion are arranged.
Parameters A1, B1, A2, B2, C respectively
A1: Area of the first recess when viewed from above
B1: A pair 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 first recess toward the outer peripheral edge of the foundation portion when viewed from the upper surface. The area of the area surrounded by the first virtual straight line, the outer peripheral edge of the first concave portion, and the outer peripheral edge of the foundation portion.
A2: Area of the second recess when viewed from above
B2: A pair of second virtual straight lines extending at 45 ° with respect to the extending direction so as to extend from the stress concentration portion of the second recess toward the outer peripheral edge of the foundation when viewed from the upper surface, and the above. The area of the area surrounded by the outer peripheral edge of the second recess and the outer peripheral edge of the foundation portion.
C: Area of the portion where the area of area B1 and the area of area B2 overlap.
When defined as
Reinforced building that satisfies (B1 + B2-C) / (A1 + A2) ≧ 1.0. With existing buildings
It is equipped with a reinforcing structure that reinforces the existing building.
The existing building
The foundation that contains the reinforcing bars inside, and
Pillars that include reinforcing bars inside and are provided on the foundation,
The beam part including the reinforcing bar inside and
It has an intersection located at an intersection of the pillar and the beam and connected to the end of the pillar and the end of the beam, respectively.
The reinforcing structure is
Reinforcing column portions containing a hardened concrete body arranged along the column portions and having reinforcing bars embedded in them, and
A reinforcing leg portion that is arranged along the pillar portion and connects the reinforcing pillar portion and the foundation portion, and a reinforcing leg portion.
Reinforcing beam parts including a hardened concrete body arranged along the beam part and having reinforcing bars embedded in them, and
It has a reinforcing intersection that is arranged at a position corresponding to the intersection and connects the end of the reinforcing column portion and the end of the reinforcing beam portion.
The reinforcing leg portion is a hardened body having a compressive strength higher than that of a hardened concrete body, and includes a hardened body in which reinforcing bars are arranged inside.
The reinforcing intersection is a hardened body that exhibits higher compressive strength than a hardened concrete body, and includes a hardened body in which reinforcing bars are arranged inside.
At least one anchor bar extending so as to communicate these is provided inside the reinforcing leg portion and the foundation portion.
The upper surface of the foundation portion is provided with a first recess and a second recess that are recessed downward.
A first convex portion and a second convex portion that project downward are provided on the lower end surface of the reinforcing leg portion.
The first concave portion and the first convex portion are fitted, and the second concave portion and the second convex portion are fitted.
The first and second recesses are lined up 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, B2 respectively
A1: Area of the first recess when viewed from above
B1: A pair of first virtual straight lines extending at 45 ° with respect to the extending direction so as to expand from the stress concentration portion of the first recess toward the second recess when viewed from the upper surface, and the first virtual line. Area of the area surrounded by the outer peripheral edge of the concave portion 1 and the second virtual straight line in contact with the outer peripheral edge of the second concave portion near the first concave portion and orthogonal to the extending direction.
A2: Area of the second recess when viewed from above
B2: When viewed from the upper surface, it extends at 45 ° with respect to the extending direction so as to expand from the stress concentration portion of the second recess toward the outer peripheral edge side of the foundation portion and toward the side away from the first recess. The area of the area surrounded by the pair of third virtual straight lines, the outer peripheral edge of the second recess, and the outer peripheral edge of the foundation portion.
When defined as
Reinforced building that satisfies (B1 + B2) / (A1 + A2) ≧ 1.0. The reinforcing legs and the reinforcing intersections are each composed of a hardened body obtained by hardening a polymer cement mortar, a hardened body obtained by hardening an ultra-high-strength mortar, or a hardened body obtained by hardening a high-strength concrete, according to claims 1 to 3. Reinforced building described in any one of the above. The reinforced building according to any one of claims 1 to 4, wherein the compressive strength of the reinforcing legs and the reinforcing intersections at the age of 28 days is 60 N / mm ² or more. Claims 1 to 1, wherein the parameters l and t are defined as l: the width of the recess in the extending direction of the beam portion and the reinforcing beam portion, and l / t ≧ 3.5 when defined as the depth of the recess. Reinforced building described in any one of 5 . The reinforced building according to claim 6 , wherein the depth t is 7 cm or less. It is located at the intersection of the foundation part containing the reinforcing bar inside, the column part containing the reinforcing bar inside and provided on the foundation part, the beam part containing the reinforcing bar inside, and the pillar part and the beam part. A reinforcing structure is provided in an existing building having an end portion of the pillar portion and an intersection connected to the end portion of the beam portion, respectively, and the existing building is reinforced by the reinforcing structure to manufacture a reinforced building. It ’s a method,
The first step of providing a recess on the upper surface by scraping the upper surface of the foundation portion, and
After the first step, the reinforcing bars are arranged at positions corresponding to the column portion, the beam portion and the intersection, respectively, and the foundation is provided so that the upper end portion of the anchor bar faces the lower end portion of the column portion. The second step of burying the anchor bar in the portion and
After the second step, a first formwork is provided so as to cover the reinforcing bar and the anchor bar arranged on the pillar portion, and the first reinforcing material is filled in the first formwork. A third step of forming a reinforcing leg portion in which the upper end portion of the anchor bar is embedded in the lower end portion of the column portion.
After the third step, a fourth step of forming a reinforcing column portion by placing concrete in the first formwork, and
After the second step, a second formwork is provided so as to cover the reinforcing bar arranged in the beam portion, and concrete is poured into the second formwork to form a reinforcing beam portion. Fifth step and
After the fourth step, a third formwork is provided so as to cover the reinforcing bar arranged at the intersection, and the third formwork is filled with the second reinforcing material to reinforce the intersection. Including a sixth step of forming
The reinforcing legs are hardened bodies that exhibit compressive strength higher than that of hardened concrete bodies.
The reinforcing intersection is a hardened body that exhibits higher compressive strength than the hardened concrete body.
With the first reinforcing material filled in the concave portion in the third step, a convex portion that protrudes downward and fits with the concave portion is formed on the lower end surface of the reinforcing leg portion.
Parameters A and B respectively
A: Area of the recess when viewed from above
B: A pair of virtual straight lines extending at 45 ° with respect to the extending direction of the beam portion and the reinforcing beam portion so as to extend from the stress concentration portion of the recess toward the outer peripheral edge of the foundation portion when viewed from the upper surface. , The area of the area surrounded by the outer peripheral edge of the recess and the outer peripheral edge of the foundation portion.
When defined as
A method for manufacturing a reinforced building that satisfies B / A ≧ 1.0 . It is located at the intersection of the foundation part containing the reinforcing bar inside, the column part containing the reinforcing bar inside and provided on the foundation part, the beam part containing the reinforcing bar inside, and the pillar part and the beam part. A reinforcing structure is provided in an existing building having an end portion of the pillar portion and an intersection connected to the end portion of the beam portion, respectively, and the existing building is reinforced by the reinforcing structure to manufacture a reinforced building. It ’s a method,
A first step of providing a first concave portion and a second concave portion on the upper surface by scraping the upper surface of the foundation portion, and a first step.
After the first step, the reinforcing bars are arranged at positions corresponding to the column portion, the beam portion and the intersection, respectively, and the foundation is provided so that the upper end portion of the anchor bar faces the lower end portion of the column portion. The second step of burying the anchor bar in the portion and
After the second step, a first formwork is provided so as to cover the reinforcing bar and the anchor bar arranged on the pillar portion, and the first reinforcing material is filled in the first formwork. A third step of forming a reinforcing leg portion in which the upper end portion of the anchor bar is embedded in the lower end portion of the column portion.
After the third step, a fourth step of forming a reinforcing column portion by placing concrete in the first formwork, and
After the second step, a second formwork is provided so as to cover the reinforcing bar arranged in the beam portion, and concrete is poured into the second formwork to form a reinforcing beam portion. Fifth step and
After the fourth step, a third formwork is provided so as to cover the reinforcing bar arranged at the intersection, and the third formwork is filled with the second reinforcing material to reinforce the intersection. Including a sixth step of forming
The reinforcing legs are hardened bodies that exhibit compressive strength higher than that of hardened concrete bodies.
The reinforcing intersection is a hardened body that exhibits higher compressive strength than the hardened concrete body.
By the first reinforcing material filled in the first and second recesses in the third step, the lower end surface of the reinforcing leg is projected downward and the first and second recesses are formed. A first convex portion and a second convex portion to be fitted to each other are formed, and the first convex portion and the second convex portion are formed.
The first and second recesses are lined up along the direction in which the pillar portion and the reinforcing pillar portion are lined up.
The first and second convex portions are arranged along the direction in which the pillar portion and the reinforcing pillar portion are arranged.
Parameters A1, B1, A2, B2, C respectively
A1: Area of the first recess when viewed from above
B1: A pair 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 first recess toward the outer peripheral edge of the foundation portion when viewed from the upper surface. The area of the area surrounded by the first virtual straight line, the outer peripheral edge of the first concave portion, and the outer peripheral edge of the foundation portion.
A2: Area of the second recess when viewed from above
B2: A pair of second virtual straight lines extending at 45 ° with respect to the extending direction so as to extend from the stress concentration portion of the second recess toward the outer peripheral edge of the foundation when viewed from the upper surface, and the above. The area of the area surrounded by the outer peripheral edge of the second recess and the outer peripheral edge of the foundation portion.
C: Area of the portion where the area of area B1 and the area of area B2 overlap.
When defined as
A method for manufacturing a reinforced building that satisfies (B1 + B2-C) / (A1 + A2) ≧ 1.0. It is located at the intersection of the foundation part containing the reinforcing bar inside, the column part containing the reinforcing bar inside and provided on the foundation part, the beam part containing the reinforcing bar inside, and the pillar part and the beam part. A reinforcing structure is provided in an existing building having an end portion of the pillar portion and an intersection connected to the end portion of the beam portion, respectively, and the existing building is reinforced by the reinforcing structure to manufacture a reinforced building. It ’s a method,
A first step of providing a first concave portion and a second concave portion on the upper surface by scraping the upper surface of the foundation portion, and a first step.
After the first step, the reinforcing bars are arranged at positions corresponding to the column portion, the beam portion and the intersection, respectively, and the foundation is provided so that the upper end portion of the anchor bar faces the lower end portion of the column portion. The second step of burying the anchor bar in the portion and
After the second step, a first formwork is provided so as to cover the reinforcing bar and the anchor bar arranged on the pillar portion, and the first reinforcing material is filled in the first formwork. A third step of forming a reinforcing leg portion in which the upper end portion of the anchor bar is embedded in the lower end portion of the column portion.
After the third step, a fourth step of forming a reinforcing column portion by placing concrete in the first formwork, and
After the second step, a second formwork is provided so as to cover the reinforcing bar arranged in the beam portion, and concrete is poured into the second formwork to form a reinforcing beam portion. Fifth step and
After the fourth step, a third formwork is provided so as to cover the reinforcing bar arranged at the intersection, and the third formwork is filled with the second reinforcing material to reinforce the intersection. Including a sixth step of forming
The reinforcing legs are hardened bodies that exhibit compressive strength higher than that of hardened concrete bodies.
The reinforcing intersection is a hardened body that exhibits higher compressive strength than the hardened concrete body.
By the first reinforcing material filled in the first and second recesses in the third step, the lower end surface of the reinforcing leg is projected downward and the first and second recesses are formed. A first convex portion and a second convex portion to be fitted to each other are formed, and the first convex portion and the second convex portion are formed.
The first and second recesses are lined up 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, B2 respectively
A1: Area of the first recess when viewed from above
B1: A pair of first virtual straight lines extending at 45 ° with respect to the extending direction so as to expand from the stress concentration portion of the first recess toward the second recess when viewed from the upper surface, and the first virtual line. Area of the area surrounded by the outer peripheral edge of the concave portion 1 and the second virtual straight line in contact with the outer peripheral edge of the second concave portion near the first concave portion and orthogonal to the extending direction.
A2: Area of the second recess when viewed from above
B2: When viewed from the upper surface, it extends at 45 ° with respect to the extending direction so as to expand from the stress concentration portion of the second recess toward the outer peripheral edge side of the foundation portion and toward the side away from the first recess. The area of the area surrounded by the pair of third virtual straight lines, the outer peripheral edge of the second recess, and the outer peripheral edge of the foundation portion.
When defined as
A method for manufacturing a reinforced building that satisfies (B1 + B2) / (A1 + A2) ≧ 1.0. The method according to any one of claims 8 to 10, wherein the first and second reinforcing materials are polymer cement mortar, ultra-high-strength mortar, or high-strength concrete, respectively. The method according to any one of claims 8 to 11, wherein the compressive strength of the reinforcing leg portion and the reinforcing intersection portion at the age of 28 days is 60 N / mm ² or more. Claims 8 to 3, wherein the parameters l and t are defined as l: the width of the recess in the extending direction of the beam portion and the reinforcing beam portion, t: the depth of the recess, and l / t ≧ 3.5 are satisfied. The method according to any one of 12. 13. The method of claim 13, wherein the depth t is 7 cm or less.

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