JP6514458B2 - Reinforcement structure - Google Patents

Description

  The present disclosure relates to a reinforcing structure for reinforcing an existing building.

  Patent Document 1 discloses a reinforcing method of reinforcing an existing building by integrating a concrete part (reinforcing unit made of precast concrete) manufactured in advance in a factory or the like with an outer side (an outer wall) of the existing building. The reinforcement structure obtained by the said reinforcement method has a reinforcement pillar unit and a reinforcement beam unit. The reinforcement column unit is disposed at a position corresponding to the column in the outer wall of the existing building. The reinforcing beam unit is disposed at a position corresponding to the beam in the outer wall of the existing building.

JP, 2005-155137, A

  Windows are generally provided in the area surrounded by pillars and beams in the outer wall of the existing building. Therefore, when the reinforcing structure as described in Patent Document 1 is installed on the outer wall of the existing building, the window is located at the back of the reinforcing structure. Therefore, there is a possibility that the lighting into the existing building through the window may be obstructed.

  Thus, the present disclosure describes a reinforcing structure capable of securing sufficient daylighting from the windows of an existing building while reinforcing the existing building.

  A reinforcing structure according to an aspect of the present disclosure is a reinforcing structure for reinforcing an existing building including a column, a beam, and an intersection located at a position where the column and the beam intersect. The reinforcement pillars, which are made of a hardened concrete with reinforcements embedded in the outer wall side of the existing building and corresponding to the pillars, and the positions corresponding to the beam parts on the outer wall side of the existing building It is arranged at the position which corresponds to the intersection on the outer wall side of the existing building and the position which corresponds to the intersection, the reinforcement beam which consists of the concrete hardening body which is arranged, the reinforcement is buried, the end of the reinforcement pillar and the end of the reinforcement beam The reinforcement cross section which is connected and made of a hardened polymer cement mortar having reinforcements embedded therein, and the reinforcement cross section has a main part whose cross section in the extending direction is substantially constant, one end of the main part, and a reinforcement cross Connect the first reinforcement intersection facing the one end of the A beam of the main portion, and a second connecting portion for connecting the other end of the main portion and the second reinforcing intersecting portion facing the other end of the reinforcing intersecting portion. Is smaller than the height of the reinforcement intersection, the beam formation of the first connection increases from one end of the main part toward the first reinforcement intersection, and the beam formation of the second connection is , From the other end of the main part toward the second reinforcement intersection.

  In the reinforcing structure according to one aspect of the present disclosure, the beam configuration of the main portion forming the reinforcing beam portion is smaller than the height of the reinforcing intersection. Therefore, when the window is provided in the area | region enclosed by the pillar part and the beam part among the outer walls of the existing building, it is hard to block the light collection from the window of the existing building.

  In addition, in the reinforcing structure according to one aspect of the present disclosure, the reinforcing intersection is constituted by the polymer cement mortar hardened body. Therefore, the reinforcement intersection portion has higher compressive strength than the reinforcement column portion and the reinforcement beam portion configured by the hardened concrete body. Therefore, even when the beam configuration of the main portion forming the reinforcing beam portion is smaller than the height of the reinforcing intersection portion, the strength as the reinforcing structure is sufficiently maintained.

  Furthermore, in the reinforcing structure according to one aspect of the present disclosure, the beam formation of the first connecting portion increases from one end of the main portion toward the first reinforcing intersection, and the second connecting portion is The beam formation increases from the other end of the main portion toward the second reinforcement intersection. Thus, both the first and second connection parts are in the shape of a hunting. Therefore, the strength of the connection portion between the reinforcing beam portion and the reinforcing intersection portion is further increased. Therefore, the strength as a reinforcing structure is more sufficiently maintained.

  As mentioned above, according to the reinforcement structure which concerns on one viewpoint of this indication, it becomes possible to fully ensure daylighting from the window of an existing building, reinforcing an existing building.

  The existing building may further include an overhanging floor projecting outward from the beam, and the reinforcing beam may be located below the overhanging floor. When the overhanging floor portion exists on the outer wall surface side of the existing building, the arrangement area of the reinforcing beam portion becomes narrow. However, in the reinforcing structure according to one aspect of the present disclosure, the beam configuration of the main portion forming the reinforcing beam portion is smaller than the height of the reinforcing intersection. Therefore, it is possible to arrange the reinforcing beam portion below the overhanging floor portion while sufficiently securing daylighting from the window of the existing building.

  The height of the both ends in the horizontal direction may be lower than the height of the portion located between the both ends in the horizontal direction. In this case, the reinforcing structure is generally mountain-shaped. When an external force is applied to the reinforcing structure due to the occurrence of an earthquake or the like, an upward force is generated at one end of the reinforcing beam portion, and a downward force is generated at the other end of the reinforcing beam portion. In the portion of the reinforcing structure located between the two ends in the horizontal direction, the force generated at the end of the reinforcing beam offsets the force generated at the end of the adjacent reinforcing beam. On the other hand, at both ends of the reinforcing structure in the horizontal direction, the force generated at the outermost end of the reinforcing beam remains without counteracting other forces. Therefore, a force is intensively applied to the foundation supporting the reinforcing structure at both ends in the horizontal direction of the reinforcing structure. However, as described above, when the reinforcing structure is generally mountain-shaped, the force concentrated on the foundation supporting the reinforcing structure is reduced at both ends in the horizontal direction of the reinforcing structure. Therefore, it is possible to increase the strength of the reinforcing structure.

  According to the reinforcing structure according to the present disclosure, it is possible to sufficiently secure daylighting from the windows of the existing building while reinforcing the existing building.

FIG. 1 is a schematic view showing an example of a reinforced building in which a reinforcing structure is installed in an existing building. (A) of FIG. 2 is a cross-sectional view taken along line IIA-IIA of FIG. 1, and (b) of FIG. 2 is a cross-sectional view taken along line IIB-IIB of FIG.

  Embodiments of the present invention will be described with reference to the drawings, but the following present embodiments are exemplifications for describing the present invention, and are not intended to limit the present invention to the following contents. In the description, the same elements or elements having the same function will be denoted by the same reference numerals, and redundant description will be omitted.

  The structure of the reinforced building 3 in which the reinforcing structure 2 is constructed in the existing building 1 will be described with reference to FIGS. 1 and 2. The existing building 1 includes a pillar 4, a beam 5, a crossing 6, an outer wall 7, a window W, an overhang floor B, and a slab not shown. The column 4, the beam 5, the intersection 6 and the slab are made of, for example, reinforced concrete.

  The column 4 is provided on the base 8 and extends along the vertical direction. The beam 5 is disposed between the adjacent pillars 4 and extends in the horizontal direction. Therefore, the braid in which the column portion 4 and the beam portion 5 are assembled has a lattice shape. The column 4 and the beam 5 have, for example, a quadrangular prism shape having a rectangular cross section. The thickness (depth) of the column 4 may be about 400 mm to 1000 mm. The width of the column 4 may be about 400 mm to 1000 mm. The thickness (depth) of the beam portion 5 may be, for example, about 200 mm to 500 mm. The width of the beam portion 5 may be about 500 mm to 1200 mm.

  In the present embodiment, six pillars 4 are arranged in the horizontal direction. Below, these pillar parts 4 may be called pillar parts 4a-4f sequentially from the left-hand side of FIG. In the present embodiment, six beam portions 5 are arranged in the vertical direction. These beam parts 5 may be called beam parts 5a-5f sequentially from the lower side of FIG. The lowermost beam 5a is disposed in the ground.

  The slab portion extends along the horizontal surface between the column portion 4 and the beam portion 5. The slab functions as a floor or ceiling. In the present embodiment, six slab portions are aligned in the vertical direction between the upper end and the lower end of the column portion 4 corresponding to the positions of the beam portions 5a to 5f. Therefore, the existing building 1 illustrated in FIG. 1 is a 5-story building.

  The intersection 6 is a portion located at the intersection of the column 4 and the beam 5. The intersection 6 also functions as part of the column 4. The outer wall 7 extends along the vertical plane between the column 4 and the beam 5. The outer wall 7 is provided with a window W.

  The overhanging floor portion B is disposed on the outer wall surface (construction surface of the reinforcing structure 2) F (see FIG. 2) of the existing building 1 and at a position corresponding to the beam portions 5b to 5e. The overhanging floor portion B protrudes outward from the beam portions 5b to 5e. The overhang floor B is, for example, a veranda or a balcony.

  The reinforcing structure 2 is provided on the outer wall surface F. As shown in FIG. 1, the reinforcing structure 2 includes a reinforcing pillar portion 9, a reinforcing beam portion 10, and a reinforcing intersection portion 11. The reinforcing column 9, the reinforcing beam 10, and the reinforcing intersection 11 have, for example, a square pillar shape having a rectangular cross section.

  The reinforcing pillar portion 9 is disposed on the outer wall surface F and at a position corresponding to the pillar portion 4. Below, the reinforcement pillar part 9 corresponding to pillar part 4a-4f may be called reinforcement pillar part 9a-9f, respectively. The reinforcing pillars 9 extend in the same direction as the extending direction of the pillars 4. That is, the reinforcing pillars 9 extend in the vertical direction. The thickness (depth) of the reinforcing column 9 may be, for example, about 350 mm to 600 mm. The width of the reinforcing column 9 may be about 500 mm to 800 mm.

  In the example shown in FIG. 1, the reinforcing pillars 9 a are located on portions of the pillars 4 a corresponding to the first floor and the second floor, respectively. Reinforcing column part 9b is located in a portion equivalent to the first floor-the 4th floor among pillar parts 4b, respectively. Reinforcing column part 9c is located in the portion equivalent to the first floor-the 4th floor among pillar parts 4c, respectively. Reinforcing column part 9d is located in a portion equivalent to the first floor-the 4th floor among pillar parts 4d, respectively. Reinforcing column part 9e is located in the portion equivalent to the first floor-the 4th floor among pillar parts 4e, respectively. Reinforcing column part 9f is located in the portion equivalent to the first floor and the second floor among pillar parts 4f, respectively.

  The reinforcing beam portion 10 is disposed on the outer wall surface F and at a position corresponding to the beam portion 5. The reinforcing beam portion 10 is located below the overhanging floor portion B. Hereinafter, the reinforcing beam portions 10 corresponding to the beam portions 5a to 5f may be referred to as reinforcing beam portions 10a to 10f, respectively. The reinforcing beam portion 10 extends in the same direction as the extending direction of the beam portion 5. That is, the reinforcing beam 10 extends in the horizontal direction. The reinforcing beam portion 10 is located between the reinforcing column portions 9 adjacent in the horizontal direction. The thickness (depth) of the reinforcing beam portion 10 may be, for example, about 350 mm to 500 mm.

  In the example shown in FIG. 1, the reinforcing beam portion 10a corresponds to the beam portion 5a between the column portions 4a and 4b, between the column portions 4b and 4c, between the column portions 4c and 4d, between the column portions 4d and 4e, And between the pillars 4e and 4f. The reinforcing beam portion 10b corresponds to the beam portion 5b, between the column portions 4a and 4b, between the column portions 4b and 4c, between the column portions 4c and 4d, between the column portions 4d and 4e, and between the column portions 4e and 4f Each is located. The reinforcing beam portion 10c corresponds to the beam portion 5c between the column portions 4a and 4b, between the column portions 4b and 4c, between the column portions 4c and 4d, between the column portions 4d and 4e, and between the column portions 4e and 4f Each is located. The reinforcing beam portion 10d is located between the column portions 4b and 4c, between the column portions 4c and 4d, and between the column portions 4d and 4e, corresponding to the beam portion 5d. The reinforcing beam portion 10e is located between the column portions 4b and 4c, between the column portions 4c and 4d, and between the column portions 4d and 4e, corresponding to the beam portion 5e.

  In the present embodiment, since the reinforcing pillars 9a to 9f and the reinforcing beam portions 10a to 10e are positioned as described above, as shown in FIG. It has a convex shape. That is, the heights of both end portions in the horizontal direction of the reinforcing structure 2 are lower than the height of the portion (central portion) located between the both end portions in the horizontal direction of the reinforcing structure 2.

  The reinforcing intersection portion 11 is disposed on the outer wall surface F and at a position corresponding to the intersection portion 6. The reinforcing intersection portion 11 connects the end portions of the reinforcing pillar portion 9 and the reinforcing beam portion 10 to each other. Therefore, the reinforcing intersection portion 11 is located at the intersection of the reinforcing column portion 9 and the reinforcing beam portion 10. Therefore, the reinforcing structure 2 is configured in a grid shape by the reinforcing column portion 9, the reinforcing beam portion 10 and the reinforcing intersection portion 11. One of the thickness (depth) and the width of the reinforcing intersection portion 11 may be, for example, 600 mm or less. The height of the reinforcing intersection portion 11 may be, for example, about 500 mm to 900 mm.

  The reinforcing column 9 and the reinforcing beam 10 are made of, for example, reinforced concrete (hardened concrete in which reinforcing bars are embedded). The reinforcement intersection portion 11 is formed of, for example, a mortar hardened body in which a reinforcing bar is embedded. The hardened mortar is obtained by hardening a polymer cement mortar. In the present embodiment, the compressive strength of the hardened mortar is greater than the compressive strength of the hardened concrete when compared at the same material age.

  Here, the polymer cement mortar will be described. A polymer cement mortar is a mixture of a polymer cement composition and water.

<Polymer cement composition>
The polymer cement composition of the present embodiment is a polymer cement composition for reinforcement method, and contains cement, fine aggregate, fluidizing agent, re-emulsifiable powder resin, inorganic expansive material, and synthetic resin fiber. Do.

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

The specific surface area of cement bran from the viewpoint of strength development is
Preferably it is 3000-6000 cm ² / g,
More preferably, it is 4000 to 5000 cm ² / g,
More preferably, it is 4200 to 4800 cm ² / g.

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

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

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

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

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

When the fine aggregate is sieved by the method defined in JIS A 1102: 2014 “Test method for screening of aggregate”, the coarse particle ratio of the fine aggregate is preferably 1.60 to 3.00,
More preferably, it is 1.90 to 2.80.
More preferably, it is 2.10 to 2.70.
Particularly preferably, it is 2.30 to 2.60.

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

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

The content of fine aggregate is 80 to 130 parts by mass with respect to 100 parts by mass of cement,
Preferably it is 85-125 mass parts,
More preferably, it is 90 to 120 parts by mass,
More preferably, it is 95 to 115 parts by mass,
Particularly preferably, it is 100 to 110 parts by mass.

  By making content of a fine aggregate into the above-mentioned range, the hardening body which has higher compressive strength can be obtained.

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

The content of the fluidizing agent is, based on 100 parts by mass of cement,
Preferably, it is 0.04 to 0.55 parts by mass,
More preferably, it is 0.11 to 0.38 parts by mass,
More preferably, it is 0.13 to 0.32 parts by mass,
Particularly preferably, it is 0.15 to 0.28 parts by mass.

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

  The type and production method of the re-emulsifiable powder resin is not particularly limited, and those produced by known production methods can be used. The re-emulsifiable powder resin may have an antiblocking agent on the surface. From the viewpoint of the durability of the hardened mortar, the re-emulsifiable powder resin preferably contains an acryl. Furthermore, in view of adhesion and compressive strength, the glass transition temperature (Tg) of the re-emulsifiable powder resin is preferably in the range of 5 to 20 ° C.

The content of the re-emulsifiable powder resin is, based on 100 parts by mass of cement,
0.2 to 6.0 parts by mass,
Preferably it is 0.5-3.5 mass parts,
More preferably, it is 0.7 to 2.8 parts by mass,
More preferably, it is 0.9 to 2.1 parts by mass,
Particularly preferably, it is 1.1 to 1.8 parts by mass.

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

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

The content of the inorganic expansive agent is 100 parts by mass of cement,
Preferably it is 2.0-10.0 mass parts,
More preferably, it is 3.0 to 9.0 parts by mass,
More preferably, it is 4.0 to 8.0 parts by mass,
Particularly preferably, it is 5.0 to 7.0 parts by mass.

  By making content of an inorganic type expansion material into the above-mentioned range, expansion property more appropriate is expressed and it can control shrinkage of a mortar hardening object.

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

The fiber length of the synthetic resin fiber is, from the viewpoint of the dispersibility in the mortar and the improvement of the crack resistance of the hardened mortar,
Preferably it is 4-20 mm,
More preferably, it is 6 to 18 mm.
More preferably, it is 8 to 16 mm,
Particularly preferably, it is 10 to 14 mm.

The content of synthetic resin fiber is 100 parts by mass of cement,
Preferably it is 0.11-0.64 mass part,
More preferably, it is 0.21 to 0.53 parts by mass,
More preferably, it is 0.28 to 0.47 parts by mass,
Particularly preferably, it is 0.32 to 0.43 parts by mass.

  By setting the fiber length and content of the synthetic resin fiber in the above-mentioned range, the dispersibility in the mortar and the crack resistance of the hardened mortar can be further improved.

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

<Polymer cement mortar>
The polymer cement mortar comprises the above-described polymer cement composition and water. A polymer cement mortar can be prepared by blending and kneading the above-described polymer cement composition and water. The polymer cement mortar prepared in this way has excellent flowability (flow value). For this reason, it is possible to smoothly fill the mold for forming the reinforcing structure. Therefore, it can be suitably used as a polymer cement mortar for a reinforcing structure of an existing building. When preparing the polymer cement mortar, the flow value of the polymer cement mortar can be adjusted by appropriately changing the water powder ratio (the amount of water / the amount of the polymer cement composition).

The water to powder ratio is
Preferably, it is 0.135 to 0.185,
More preferably, it is 0.140 to 0.180,
More preferably, it is 0.143 to 0.177,
Particularly preferred is 0.145 to 0.175.

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

The flow value of polymer cement mortar is
Preferably, it is 160-280 mm,
More preferably, it is 165-270 mm,
More preferably, it is 170-260 mm.

  When the flow value is in the above-mentioned range, a polymer cement mortar excellent in material separation resistance and filling property can be obtained.

<Mortified mortar>
A mortar hardening body can be formed by hardening a polymer cement mortar. The mortar cured product formed in this manner is excellent in strength development when it is integrated with concrete columns and beams that constitute a reinforcing structure of an existing building. For this reason, the construction period of the reinforcement method can be shortened. Moreover, since it has high compressive strength, the earthquake resistance of the existing building can be improved.

With compressive strength, a cylindrical form with an inner diameter of 5 cm and a height of 10 cm is filled with mortar, demolded 24 hours later, and then cured in water to a predetermined age according to JIS A 1108: 2006 “Concrete Compression Test Method It is a value (N / mm ² ) measured in accordance with

The compressive strength at 7 days of age of the hardened mortar measured by the above-mentioned test method is
Preferably, it is 60 N / mm ² or more.
More preferably, it is 61 N / mm ² or more.
More preferably, it is 62 N / mm ² or more.
Particularly preferably, it is 63 N / mm ² or more.

  The work period of the reinforcement method can be further shortened by using a hardened mortar having a strength developing property that can reach the above-mentioned compressive strength at a material age of 7 days.

The 28-day-old compressive strength of the hardened mortar measured by the above-mentioned test method is
Preferably, it is 65 N / mm ² or more,
More preferably, it is 70 N / mm ² or more.
More preferably, it is 71 N / mm ² or more.
Particularly preferably, it is 72 N / mm ² or more.

  When the compressive strength is in the above-mentioned range, when it is integrated with a column or a beam of concrete for reinforcement, it is possible to exhibit further excellent earthquake resistance performance.

  Subsequently, the reinforcing beam portion 10 will be described in more detail with reference to FIGS. 1 and 2. The reinforcing beam portion 10 has a main portion 10A and connecting portions 10B and 10C. The beam configuration in the extending direction (horizontal direction) of the main portion 10A is substantially constant. The beam structure of the main portion 10A is smaller than the height of the reinforcement intersection portion 11. The beam structure of the main portion 10A may be about 300 mm to 450 mm, and may be about 100 mm to 350 mm smaller than the width of the reinforcement column 9.

  The connecting portion 10B is one end of the main portion 10A (the left end of the main portion 10A in FIG. 1) and the reinforcing intersecting portion 11 facing the one end (the reinforcing intersecting portion 11 located to the left of the main portion 10A in FIG. 1). ), And connect them. The connecting portion 10B is a reinforcing intersecting portion 11 positioned to the left of the main portion 10A in FIG. 1 from the one end (the left end of the main portion 10A in FIG. 1) of the main portion 10A. As you head to), it is getting bigger. More specifically, the upper portion of the connecting portion 10B extends along the horizontal direction, while the lower portion of the connecting portion 10B extends obliquely with respect to the horizontal direction.

  The connecting portion 10C has the other end of the main portion 10A (the right end of the main portion 10A in FIG. 1) and the reinforcing intersection 11 facing the other end (a reinforcing intersection located on the right of the main portion 10A in FIG. 1) It is located between the parts 11) and connects them. The connecting portion 10C is a reinforcement crossing portion 11 located on the right side of the main portion 10A in FIG. 1 from the other end (the right end of the main portion 10A in FIG. 1) of the main portion 10A As you head to part 11), it is getting bigger. More specifically, the upper portion of the connecting portion 10C extends in the horizontal direction, but the lower portion of the connecting portion 10C extends obliquely with respect to the horizontal direction.

  The lengths of the connecting portions 10B and 10C may be, for example, about 800 mm to 2500 mm. The inclination of the connecting portions 10B and 10C may be, for example, about 4 ° to 6 ° with respect to the horizontal direction.

  In the present embodiment, the reinforcing beam portion 10 (the main portion 10A and the connecting portions 10B and 10C) has a main portion MP and a striking additional portion AP, as shown in FIG. The main portion MP is a portion that exhibits the original function of the reinforcing beam portion 10. The additional striking portion AP is a portion for filling in the difference in level when the column 4 and the beam 5 of the existing building 1 are not on the same plane (not flush with each other).

  In the main portion MP, a reinforcing bar 12 composed of a main reinforcement 12a extending in the extending direction and a shear reinforcement 12b connected to the main reinforcement 12a so as to surround the main reinforcement 12a is disposed. In the additional reinforcement portion AP, a main reinforcement 13a extending in the extending direction, and an auxiliary reinforcement 13b extending between the main portion MP and the additional reinforcement portion AP so as to connect the main reinforcement bars 12a and 13a. Rebars 13 are arranged. That is, a part of the auxiliary reinforcement 13b is located in the main part MP, and the remaining part of the auxiliary reinforcement 13b is located in the additional striking portion AP.

  In the present embodiment as described above, the beam formation of the main portion 10A is smaller than the height of the reinforcement intersection portion 11. Therefore, when the window W is provided in the outer wall 7 of the existing building 1, it is difficult to inhibit the light from the window W. Therefore, it is possible to secure sufficient lighting from the windows of the existing building.

  In addition, in the present embodiment, the reinforcement intersection portion 11 is constituted by a polymer cement mortar hardened body. Therefore, the reinforced intersection portion 11 has a compressive strength greater than that of the reinforcing column portion 9 and the reinforcing beam portion 10 which are formed of a hardened concrete body. Therefore, even when the beam structure of the main portion 10A is smaller than the height of the reinforcement intersection portion 11, the strength as the reinforcement structure 2 is sufficiently maintained.

  Furthermore, in the present embodiment, the beam shape of the connecting portion 10B increases from one end of the main portion 10A toward the reinforcing intersection 11 facing the one end, and the beam shape of the connecting portion 10C is the main portion 10A It becomes large as it goes to the reinforcement crossing part 11 which opposes the said other end from the other end. Thus, both the connection parts 10B and 10C are exhibiting the shape of a hunting. Therefore, the strength of the connection portion between the reinforcing beam portion 10 and the reinforcing intersection portion 11 is further increased. Therefore, the strength as the reinforcing structure 2 is more sufficiently maintained.

  As mentioned above, according to the reinforcement structure 2 which concerns on this embodiment, it becomes possible to fully ensure the daylighting from the window W of the existing building 1 while reinforcing the existing building 1.

  In the present embodiment, since the overhanging floor portion B is present on the outer wall surface F side of the existing building 1, the arrangement area of the reinforcing beam portion 10 is narrowed. However, in the reinforcing structure 2 according to the present embodiment, the beam configuration of the main portion 10A is smaller than the height of the reinforcing intersection portion 11. Therefore, it is possible to arrange the reinforcing beam portion 10 below the overhanging floor portion B while sufficiently securing daylighting from the window W of the existing building 1.

  When an external force is applied to the reinforcing structure 2 due to the occurrence of an earthquake or the like, an upward force is generated at one end of the reinforcing beam portion 10, and a downward force is generated at the other end of the reinforcing beam portion 10. Here, as an example, it is assumed that an upward force is generated at the left end of the reinforcing beam portion 10 in FIG. 1 and a downward force is generated at the right end of the reinforcing beam portion 10. The upward force generated at the left ends of the reinforcing beam portions 10a to 10e between the reinforcing column portions 9c and 9d cancels the downward force generated at the right ends of the reinforcing beam portions 10a to 10e between the reinforcing column portions 9b and 9c. The downward force generated at the right ends of the reinforcing beam portions 10a to 10e between the reinforcing column portions 9c and 9d cancels the upward force generated at the left ends of the reinforcing beam portions 10a to 10e between the reinforcing column portions 9d and 9e. The upward force generated at the left ends of the reinforcing beam portions 10a to 10c between the reinforcing column portions 9b and 9c cancels the downward force generated at the right ends of the reinforcing beam portions 10a to 10c between the reinforcing column portions 9a and 9b. The downward force generated at the right ends of the reinforcing beam portions 10a to 10c between the reinforcing column portions 9d and 9e cancels the upward force generated at the left ends of the reinforcing beam portions 10a to 10c between the reinforcing column portions 9d and 9e.

  Therefore, in the present embodiment in which the reinforcing structure 2 as a whole exhibits a convex shape (peak shape), the upward force generated at the left ends of the reinforcing beam portions 10a to 10c between the reinforcing column portions 9a and 9b is another force. It remains without being canceled out, and is intensively added to the base portion 8 that supports the reinforcing column portion 9a. The upward force generated at the left ends of the reinforcing beam portions 10d and 10e between the reinforcing column portions 9b and 9c remains without counteracting other forces and is concentratedly applied to the base portion 8 supporting the reinforcing column portion 9b. . The downward force generated at the right ends of the reinforcing beam portions 10d and 10e between the reinforcing column portions 9d and 9e remains without being offset with other forces, and is concentratedly applied to the base portion 8 supporting the reinforcing column portion 9e. . The downward force generated at the right ends of the reinforcing beam portions 10a to 10c between the reinforcing column portions 9e and 9f remains without counteracting other forces and is concentratedly applied to the base portion 8 supporting the reinforcing column portion 9f. . In the case of a reinforcing structure in which the reinforcing column portion and the reinforcing beam portion have a lattice shape, forces are concentrated on the base portion by the number of reinforcing beam portions aligned in the vertical direction at both ends in the horizontal direction among the reinforcing structures. However, in the reinforcing structure 2 according to the present embodiment, the force concentrated on the base portion 8 is reduced. Therefore, it is possible to further enhance the proof stress of the reinforcing structure 2.

  As mentioned above, although embodiment of this invention was described in detail, you may add various deformation | transformation to said embodiment within the range of the summary of this invention. For example, the existing building 1 may not have the overhang floor B.

  If the heights of both ends of the reinforcing structure 2 in the horizontal direction are lower than the height of the portion (central portion) located between the both ends in the horizontal direction of the reinforcing structure 2, the reinforcing structure 2 may have a mountain shape other than a convex shape.

  DESCRIPTION OF SYMBOLS 1 ... existing building, 2 ... reinforcement structure, 3 ... reinforcement building, 4,4a-4f ... pillar part, 5, 5a-5f ... beam part, 6 ... intersection part, 9, 9a-9f ... reinforcement pillar part, 10, 10a to 10f Reinforcement beam portion, 10A: Main portion, 10B, 10C: Connecting portion, 11: Reinforcement intersection portion, B: Overhanging floor portion, F: Outer wall surface, W: Window.

Claims (4)

A reinforcing structure for reinforcing an existing building, comprising: a column portion; a beam portion; and an intersection portion located at a position where the column portion and the beam portion intersect.
A reinforcing pillar portion made of a hardened concrete body disposed on the outer wall side of the existing building and at a position corresponding to the pillar portion;
A reinforced beam portion which is disposed on the outer wall side of the existing building and at a position corresponding to the beam portion, and which is made of a hardened concrete body in which a reinforcing bar is embedded;
It is arranged from the outer wall side of the existing building and at a position corresponding to the intersection, and is connected to the end of the reinforcing column and the end of the reinforcing beam, from the hardened polymer cement mortar in which the reinforcing bars are embedded And a reinforced cross section,
The reinforcing beam portion is
A main part whose beam formation in the extending direction is substantially constant;
A first connecting portion that connects one end of the main portion and a first reinforcing intersecting portion facing the one end of the reinforcing intersecting portion;
A second connecting portion connecting the other end of the main portion and a second reinforcing intersecting portion facing the other end of the reinforcing intersecting portion;
The beam formation of the main part is smaller than the height of the reinforcement intersection,
The beam formation of the first connection portion is increased from one end of the main portion toward the first reinforcement intersection portion,
The beam formation of the second connection portion increases from the other end of the main portion toward the second reinforcement intersection portion,
The lower end edge of the reinforcement intersection is located below the lower end edge of the intersection,
The lower end edge of the main portion is located at substantially the same height as the lower end edge of the beam portion,
The reinforcing structure, wherein at least a part of lower end edges of the first and second coupling portions are positioned lower than lower end edges of the beam portion.   The lower end edge of the first connecting portion obliquely extends at an angle of 4 ° to 6 ° with respect to the horizontal direction so as to extend downward from the main portion toward the first reinforcing intersection portion,
  The lower end edge of the second connecting portion obliquely extends at an angle of 4 ° to 6 ° with respect to the horizontal direction so as to extend downward from the main portion toward the second reinforcing intersection portion. The reinforcing structure according to claim 1. The existing building further includes an overhang floor projecting outward from the beam portion,
The reinforcing beam portion is located below the overhanging floor, reinforcing structure according to claim 1 or 2. The reinforcing structure according to any one of claims 1 to 3 , wherein the heights of both ends in the horizontal direction are lower than the height of a portion located between the both ends in the horizontal direction.

Images