JP6424045B2 - Manufacturing method of reinforced structure - Google Patents

Description

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

  Patent Document 1 discloses a reinforcing method for reinforcing an existing building by assembling a concrete part (a precast concrete reinforcing unit) manufactured in advance in a factory or the like and integrating it with the outside (outer wall) of the existing building. When assembling these concrete parts, a compressive stress (pre-stressing) is applied in advance to the concrete parts (reinforcing column units) that serve as reinforcing columns and the horizontal PC steel materials that pass through the concrete parts (reinforcing beam units) that serve as reinforcing beams. Prestress) is applied to improve the seismic performance of the reinforcement unit.

JP 2005-155137 A

  In the case of the reinforcing method using the reinforcing unit as disclosed in Patent Document 1, it is necessary to transport a heavy concrete part from the factory to the site. In addition, in the case of the reinforcement method, a facility for manufacturing the reinforcement unit and a step of applying prestress to the reinforcement unit are required. Therefore, the reinforcement method is complicated and expensive.

  Thus, the present disclosure describes a method for manufacturing a reinforced structure capable of simply and inexpensively reinforcing an existing building.

  The manufacturing method of the reinforcing structure according to one aspect of the present disclosure includes the first and second column portions adjacent in the horizontal direction and the first and second columns adjacent in the vertical direction and arranged in this order upward. A beam portion, a first intersection located at a location where the lower end of the first column portion and one end of the first beam portion intersect, the lower end of the second column portion, and the other end of the first beam portion A second intersection located at a location where the crossing and the third intersection located at a location where the upper end of the first pillar and the one end of the second beam intersect, and the second pillar A method of manufacturing a reinforcing structure for reinforcing an existing building comprising a fourth intersection located at a location where the upper end of the second beam and the other end of the second beam intersect, and the outer wall side of the existing building And arranging the reinforcing bars at positions corresponding to the first and second pillar parts, the first and second beam parts, and the first to fourth intersecting parts, and arranging the reinforcing bars. A step of placing concrete in a first mold formed in a portion of the reinforcing bar corresponding to the first beam portion, and a step of placing concrete in the first mold Later, after filling the polymer mold mortar into the second mold formed in the portion corresponding to the first intersection of the reinforcing bars, and placing the concrete in the first mold, After filling the polymer mold mortar into a third mold formed in the portion corresponding to the second intersection of the reinforcing bars, filling the polymer cement mortar into the second mold, and A step of placing concrete in a fourth mold formed in a portion corresponding to the first pillar portion of the reinforcing bar after passing time of the polymer cement mortar; and in the third mold Filled with polymer cement mortar And after placing the polymer cement mortar after the lapse of time, placing concrete in the fifth mold frame formed in the portion corresponding to the second column portion of the reinforcing bar, After the step of arranging the reinforcing bars, the step of placing concrete in the sixth mold frame formed in the portion corresponding to the second beam portion of the reinforcing bars, and the concrete in the fourth to sixth mold frames A step of filling the cement cement mortar into the seventh mold frame formed in the portion corresponding to the third intersection of the reinforcing bars, and the fourth to sixth mold frames. Filling the polymer cement mortar into the eighth mold formed in the portion corresponding to the fourth intersection of the reinforcing bars after the step of placing the concrete, and the joining time of the polymer cement mortar Is 30 minutes to 2 hours The compressive strength of the mortar cured product obtained by curing the remer cement mortar is larger than the compressive strength of the concrete cured product obtained by curing the concrete.

  In the method for manufacturing a reinforced structure according to one aspect of the present disclosure, concrete is placed in the first and fourth to sixth molds, the outer wall surface side of the existing building, the column portion of the existing building, and A hardened concrete body is provided at a location corresponding to the beam. In the method for manufacturing a reinforcing structure according to one aspect of the present disclosure, the second, third, seventh, and eighth molds are filled with polymer cement mortar, and the existing building is on the outer wall surface side. The mortar hardening body is provided in the location corresponding to this intersection. Therefore, the pillar part (reinforcement pillar part) and the beam part (reinforcement beam part) of a reinforcement structure are comprised by a concrete hardening body by removing the 1st and 4th-6th formwork. By removing the second, third, seventh, and eighth molds, the intersecting portion of the reinforcing structure (reinforcing intersecting portion) is formed of a mortar cured body.

  By the way, when all of a reinforcement pillar part, a reinforcement beam part, and a reinforcement crossing part are comprised with a mortar hardening body, while a very strong reinforcement structure can be obtained, cost will increase significantly. However, in the method for manufacturing a reinforcing structure according to one aspect of the present disclosure, the reinforcing column part and the reinforcing beam part are configured by a hardened concrete body, and the reinforcing intersection is formed by a hardened mortar body. In addition, in the method for manufacturing a reinforced structure according to one aspect of the present disclosure, a reinforced intersection that requires higher strength is configured with a mortar cured body having a compressive strength higher than that of the concrete cured body. The reinforcing column portion and the reinforcing beam portion that do not require the above strength are made of a hardened concrete. Therefore, it is possible to manufacture the reinforcing structure at a low cost while sufficiently reinforcing the existing building with the reinforcing structure.

  In the method for manufacturing a reinforced structure according to one aspect of the present disclosure, the reinforcing intersection where higher strength is required is formed of a mortar cured body having a compressive strength higher than that of the concrete cured body. Therefore, the strength of the reinforcing structure is ensured even if the width of the reinforcing column part and the beam formation of the reinforcing beam part are reduced as compared with the case where the entire reinforcing structure is constituted by a hardened concrete body. Therefore, it is possible not only that the appearance of the existing building provided with the reinforcing structure is not easily damaged by the reinforcing column part and the reinforcing beam part, but also it is possible to provide a reinforcing structure with a high degree of design freedom and rich design. It becomes.

  In the method for manufacturing a reinforced structure according to one aspect of the present disclosure, a polymer cement mortar having a curing property with a joining time of 30 minutes to 2 hours is used. Therefore, the concrete can be placed into the fourth and fifth molds after the piercing time has elapsed. Therefore, it is possible to quickly place concrete without waiting for the polymer cement mortar to harden. As a result, the construction period of the reinforcing structure is extremely shortened. In addition, in the method for manufacturing a reinforcing structure according to one aspect of the present disclosure, concrete is sequentially placed and polymer cement mortar is filled from below to above. Therefore, concrete leakage is necessary when concrete is placed in the locations corresponding to the pillars and beams of the existing building, and then the polymer cement mortar is filled in the locations corresponding to the intersections of the existing building. Special members such as stops are not required. Therefore, it is possible to reinforce the existing building very easily.

  According to an aspect of the present disclosure, there is provided a method for manufacturing a reinforced structure in which each end of a first formwork is provided after a step of placing reinforcing bars and before a step of placing concrete in the first formwork. After the step of arranging the first mesh member so as to be located inside the portion and the step of arranging the reinforcing bars, and before the step of placing concrete in the sixth mold And a step of disposing the second mesh member so as to be located inside each end of the. In this case, the outflow of unsolidified concrete from each end of the first and sixth molds can be suppressed by the first and second mesh members.

  The polymer cement mortar includes a cement, fine aggregate, a fluidizing agent, a re-emulsifying powder resin, a synthetic resin fiber, and a polymer cement composition containing a setting accelerator, and water. You may contain 0.20 mass part-2.00 mass parts of setting accelerators with respect to 100 mass parts. In this case, a polymer cement mortar having a joining time of 30 minutes to 2 hours can be obtained by using a polymer cement composition having a better fast setting. In addition, when such a polymer cement composition is used, the initial curing characteristics of the mortar cured body can be further improved.

  According to the method for manufacturing a reinforcing structure according to the present disclosure, it is possible to simply and inexpensively reinforce an existing building.

FIG. 1 is a schematic view showing an example of a reinforced building in which a reinforced structure is constructed in an existing building. FIG. 2 is a front view showing the reinforcing structure. 3A is a cross-sectional view taken along the line IIIA-IIIA in FIG. 2, and FIG. 3B is a cross-sectional view taken along the line IIIB-IIIB in FIG. FIG. 4 is a diagram illustrating an example of a manufacturing process of a reinforcing structure. FIG. 5 is a diagram illustrating an example of a manufacturing process of a reinforcing structure. FIG. 6 is a diagram illustrating an example of the manufacturing process of the reinforcing structure. FIG. 7 is a diagram illustrating an example of the manufacturing process of the reinforcing structure. FIG. 8 is a diagram illustrating an example of the manufacturing process of the reinforcing structure. FIG. 9 is a diagram illustrating an example of the manufacturing process of the reinforcing structure. FIG. 10 is a diagram illustrating an example of a manufacturing process of a reinforcing structure. FIG. 11 is a schematic diagram illustrating another example of a reinforced building in which a reinforced structure is constructed in an existing building.

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

  First, the structure of the reinforced building 3 in which the reinforced structure 2 is constructed in the existing building 1 will be described with reference to FIG. The existing building 1 includes a column part 4, a beam part 5, an intersection part 6, and a slab part 7. The column part 4, the beam part 5, the crossing part 6, and the slab part 7 are comprised, for example by reinforced concrete. Although not shown, the existing building 1 also includes an outer wall and the like.

  The column portion 4 is provided on the base portion 8 and extends along the vertical direction. The beam part 5 is arrange | positioned between the adjacent pillar parts 4, and extends along a horizontal direction. Therefore, the assembly in which the column part 4 and the beam part 5 are assembled has a lattice shape. The column portion 4 and the beam portion 5 have a rectangular column shape having a rectangular cross section, for example. The thickness (depth) of the column part 4 may be about 400 mm to 1000 mm. The width of the column part 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.

  The intersecting portion 6 is a portion located at a location where the column portion 4 and the beam portion 5 intersect. The intersecting portion 6 also functions as a part of the column portion 4. The slab part 7 extends along the horizontal plane between the column part 4 and the beam part 5. The slab part 7 functions as a floor or a ceiling. In FIG. 1, four slab portions 7 are arranged along the vertical direction between the upper end and the lower end of the column portion 4. Therefore, the existing building 1 illustrated in FIG. 1 is a three-story building.

  The reinforcement structure 2 is provided on the outer wall surface (construction surface of the reinforcement structure 2) F (see FIG. 3) of the existing building 1. As shown in FIG. 1, the reinforcing structure 2 includes a reinforcing column portion 9, a reinforcing beam portion 10, and a reinforcing intersection portion 11. The reinforcing column part 9, the reinforcing beam part 10, and the reinforcing intersection part 11 have, for example, a rectangular column shape having a rectangular cross section.

  The reinforcing column portion 9 is disposed on the outer wall surface F and at a position corresponding to the column portion 4. The reinforcing column portion 9 extends along the same direction as the extending direction of the column portion 4. In other words, the reinforcing column portion 9 extends along the vertical direction. In the example shown in FIG. 1, the reinforcing pillars 9 are respectively located on the first floor part and the second floor part of the existing building 1. In the central portion of the existing building 1, the reinforcing pillar portion 9 is also located on the third floor portion of the existing building 1. As shown in FIG. 1, the reinforcing column portions 9 adjacent in the vertical direction correspond to the same column portion 4. 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.

  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 extends along the same direction as the extending direction of the beam portion 5. That is, the reinforcing beam portion 10 extends along the horizontal direction. The reinforcing beam portion 10 is located between the reinforcing column portions 9 adjacent in the horizontal direction. As shown in FIG. 1, the reinforcing beam portions 10 adjacent in the horizontal direction correspond to the same beam portion 5. The thickness (depth) of the reinforcing beam portion 10 may be, for example, about 350 mm to 500 mm. The beam formation of the reinforcing beam portion 10 may be about 500 mm to 900 mm, and may be about 100 mm larger than the width of the reinforcing column portion 9.

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

  The reinforcing column portion 9 and the reinforcing beam portion 10 are made of, for example, reinforced concrete in which reinforcing bars are embedded in a hardened concrete body. The hardened concrete body is made of hardened concrete. The reinforcing intersection 11 is made of, for example, a mortar hardened body in which reinforcing bars are embedded. The cured mortar is formed by curing polymer cement mortar. In this embodiment, the compressive strength of a mortar hardened body is larger than the compressive strength of a hardened concrete body when compared with the age of the same day.

  Here, the polymer cement mortar will be described. 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 a reinforcing method, and includes cement, fine aggregate, fluidizing agent, re-emulsifying powder resin, inorganic expansion material, synthetic resin fiber, and setting acceleration. Contains agents.

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

From the viewpoint of strength development, the Blaine specific surface area of cement is
Preferably it is 3000-6000 cm < ² > / g,
More preferably, it is 4000-5000 cm < ² > / g,
More preferably, it is 4200-4800 cm < ² > / g.

  Examples of the fine aggregate include sand such as quartz sand, river sand, land sand, sea sand, and crushed sand. A fine aggregate can be used individually by 1 type selected from these or in combination of 2 or more types. Among these, it is preferable to contain silica sand from the viewpoint of further smoothing the filling property of the polymer cement mortar into the mold.

  When a fine aggregate is screened by the method specified in JIS A 1102: 2014 “Aggregate Screening Test Method”, the mass fraction (%) remaining between successive screens is 0 at a sieve opening of 2000 μm. It is preferable that it is mass%. When all 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
In 1180 micrometers of sieve openings, it is 5.0-25.0,
In a sieve opening of 600 μm, it is 20.0 to 50.0,
In a sieve opening of 300 μm, it is 20.0 to 50.0,
In a sieve opening of 150 μm, it is 5.0 to 25.0,
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
In a sieve opening of 1180 μm, it is 10.0 to 20.0,
In a sieve opening of 600 μm, it is 25.0 to 45.0,
In a sieve opening of 300 μm, it is 25.0 to 45.0,
In a sieve opening of 150 μm, it is 10.0 to 20.0,
It is more preferably 0 to 5.0 at a sieve opening of 75 μm.

  When the fine aggregate is screened according to the above rules, the mortar having better material separation resistance and fluidity is obtained because the mass fraction (%) staying between each successive screen is within the above range. A cured product having higher compressive strength can be obtained.

When the fine aggregate is screened by the method defined in JIS A 1102: 2014 “Aggregate Screening Test Method”, the coarse particle ratio of the fine aggregate is preferably 1.60 to 3.00,
More preferably, it is 1.90-2.80,
More preferably, it is 2.10-2.70,
Especially preferably, it is 2.30-2.60.

  When the coarse particle ratio of the fine aggregate is in the above 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 sieving can be performed using several sieves having different openings as defined in JIS Z 8801-1: 2006 “Test sieve—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 parts by mass,
More preferably, it is 90-120 parts by mass,
More preferably 95 to 115 parts by mass,
Most preferably, it is 100-110 mass parts.

  By setting the content of the fine aggregate within the above range, a cured body having higher compressive strength can be obtained.

  Examples of the fluidizing agent include formaldehyde condensates of melamine sulfonic acid, casein, calcium caseinate, and polycarboxylic acids. A fluidizing agent can be used individually by 1 type selected from these or in combination of 2 or more types. Among these, from the viewpoint of obtaining a high water reducing effect, it is preferable to include a polycarboxylic acid-based fluidizing agent. By using a polycarboxylic acid-based fluidizing agent, the water powder ratio can be reduced, and the strength development of the mortar cured body can be further improved.

The content of the fluidizing agent is 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,
Especially preferably, it is 0.15-0.28 mass part.

  By setting the content of the fluidizing agent in the above range, a polymer cement mortar having better fluidity can be obtained. Moreover, the mortar hardening body which has much higher compressive strength can be obtained.

  The type and production method of the re-emulsifying powder resin are not particularly limited, and those produced by a known production method can be used. The re-emulsified powder resin may have an anti-blocking agent on the surface. From the viewpoint of durability of the cured mortar, the re-emulsified powder resin preferably contains acrylic. Furthermore, 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,
0.2 to 6.0 parts by mass,
Preferably 0.5 to 3.5 parts by mass,
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 preferred is 1.1 to 1.8 parts by mass.

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

  Examples of the inorganic expansion material include quick lime-gypsum expansion material, gypsum expansion material, calcium sulfoaluminate expansion material, and quick lime-gypsum-calcium sulfoaluminate expansion material. An inorganic expansion material can be used individually by 1 type selected from these or in combination of 2 or more types. Among these, from the viewpoint of further improving the compressive strength of the cured body, it is preferable to include quick lime-gypsum-calcium sulfoaluminate-based expansion material.

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

  By setting the content of the inorganic expansive material in the above range, more appropriate expansibility can be exhibited and shrinkage of the mortar hardened body can be suppressed.

  Examples of the synthetic resin fiber include polyethylene, ethylene / vinyl acetate copolymer (EVA), polyolefin such as polypropylene, polyester, polyamide, polyvinyl alcohol, vinylon, and polyvinyl chloride. A synthetic resin fiber can be used individually by 1 type selected from these or in combination of 2 or more types.

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

The content of the synthetic resin fiber is 100 parts by mass of cement,
Preferably it is 0.11-0.64 parts by mass,
More preferably 0.21 to 0.53 parts by mass,
More preferably 0.28 to 0.47 parts by mass,
Particularly preferred is 0.32 to 0.43 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 mortar cured body can be further improved.

  The setting accelerator is used to adjust the pot life (flow retention) and fast setting (acceleration of hydration reaction of cement) of the polymer cement composition.

  As the setting accelerator, a known component for promoting setting can be used. For example, chlorides, nitrites, nitrates, sulfates, carbonates, aluminates, and organic acid salts having a setting promoting effect can be suitably used, and these can be used alone or in combination. .

  Examples of sulfates include calcium sulfate, sodium sulfate, potassium sulfate, and lithium sulfate. Examples of carbonates include calcium carbonate, sodium carbonate, potassium carbonate, and lithium carbonate, and aluminate. Examples of the salt include sodium aluminate, potassium aluminate, and lithium aluminate. Examples of the organic acid salt include calcium formate, calcium acetate, and calcium acrylate. Among these, calcium formate is preferable because it can obtain a setting acceleration effect (fast curing) while maintaining fluidity. In addition, it is preferable to use calcium formate and sodium aluminate in combination, because more rapid rapid hardness can be obtained while suppressing a decrease in fluidity.

The content of the setting accelerator is 100 parts by mass of cement,
Preferably 0.20 parts by mass to 2.00 parts by mass,
More preferably 0.30 parts by mass to 1.80 parts by mass,
More preferably 0.40 parts by mass to 1.60 parts by mass,
Especially preferably, it is 0.50 mass part-1.50 mass part.

  By setting the content of the setting accelerator in the above-described range, a polymer cement composition having more excellent quick hardening can be obtained while suppressing a decrease in fluidity. Moreover, the initial curing characteristics of the cured body can be further improved.

  The polymer cement composition of the present embodiment may contain a setting retarder, a thickener, a metal-based expansion material, an antifoaming agent, and the like depending on applications.

<Polymer cement mortar>
The polymer cement mortar includes the polymer cement composition described above and water. The polymer cement mortar can be prepared by blending and kneading the above polymer cement composition and water. The polymer cement mortar thus prepared has excellent flowability (flow value) and has a curing property that provides a joining time (details will be described later) between 30 minutes and 2 hours. For this reason, while being able to perform the filling in the formwork for forming a reinforcement structure smoothly, it can transfer to the following process in a short time because it has quick-hardness. 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 (water amount / polymer cement composition amount).

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

  The flow value in this 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 sheet having a thickness of 5 mm. At this time, it arrange | positions so that one end of a pipe made from a vinyl chloride may contact polishing glass, and the other end may face upward. The polymer cement mortar is poured from the opening on the other end side, and the vinyl chloride pipe is filled with the polymer cement mortar, and then the vinyl chloride pipe is pulled up vertically. After the mortar spread stops, the diameter (mm) in two directions perpendicular to each other is measured. Let the average value of a measured value be a 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 range, a polymer cement mortar excellent in material separation resistance and filling property can be obtained.

The state of the polymer cement mortar is gradually hydrated after water is poured into the polymer cement composition, and has a fluidity after kneading as described above.
(1) Flow stop state (2) Semi-cured state (3) Changes with time in order of cured state.

  In this specification, the flow stop state of the polymer cement mortar means a state in which the polymer cement mortar has lost its fluidity. In the present specification, the state in which the polymer cement mortar has lost its fluidity means, for example, when the flow cone is lifted vertically in a state where the flow cone described in JIS R 5201-1997 is filled with the polymer cement mortar, The shape of the flow cone is kept in the shape of the flow cone without being deformed.

  In this specification, the semi-cured state of the polymer cement mortar means that the polymer cement mortar is polymer to such an extent that new concrete can be placed (joined) in contact with the mortar semi-cured body in the semi-cured state. The cement mortar is hardened (hydration progresses). In this specification, the time from when water is poured into the polymer cement composition until it becomes a mortar semi-cured product is referred to as “joining time”. In the present specification, the joining time is a time measured according to the method for measuring the initial setting of the setting described in JIS R 5201-1997 “Physical Test Method for Cement”. More specifically, when the initial needle for measuring the initial setting of the setting is replaced with a plunger (standard rod) for penetration test, the mark of the plunger does not remain on the surface of the polymer cement mortar. The semi-cured state is set, and the time from when water is poured into the polymer cement composition to the semi-cured state is referred to as “joining time”. The joining time is longer than the time from when water is poured into the polymer cement composition until the flow is stopped.

The joining time of the polymer cement mortar according to this embodiment is
Preferably between 30 minutes and 2 hours,
More preferably, between 35 minutes and 1 hour 45 minutes,
More preferably, it is between 40 minutes and 1 hour 30 minutes,
Particularly preferred is between 45 minutes and 1 hour 15 minutes.

  When the splicing time is in the above-described range, a polymer cement mortar having an appropriate pot life (working time) and quick hardening that can be transferred to the next process in a short time can be obtained.

  The initial and final times of setting of the polymer cement mortar come between the semi-hardened state and the hardened state of the polymer cement mortar. That is, the initial setting time of the setting of the polymer cement mortar is longer than the joining time. The end time of setting is longer than the starting time of setting. The time from pouring water into the polymer cement composition until reaching the hardened state is longer than the end time of setting.

  The initial setting time in the present specification is a time measured in accordance with the method for measuring the initial setting of condensation specified in JIS R 5201-1997 “Cement physical test method”.

The initial setting time for setting of polymer cement mortar is
Preferably between 50 minutes and 3 hours,
More preferably, it is between 55 minutes and 2 hours 30 minutes,
More preferably, it is between 1 hour and 2 hours and 15 minutes,
Particularly preferred is between 1 hour and 2 hours.

  When the initial setting time of the setting is in the above-described range, a polymer cement mortar having an appropriate pot life (working time) and quick hardening capable of moving to the next process in a short time can be obtained.

  The setting completion time in the present specification is a time measured according to the method for measuring the setting completion specified in JIS R 5201-1997 “Cement physical test method”.

The settling time of polymer cement mortar is
Preferably between 1 hour and 3 hours 30 minutes,
More preferably, it is between 1 hour 10 minutes and 3 hours 15 minutes,
More preferably, it is between 1 hour 10 minutes and 3 hours,
Particularly preferred is between 1 hour 10 minutes and 2 hours 45 minutes.

  When the termination is in the above-described range, a polymer cement mortar having an appropriate pot life (working time) and quick hardening that can be transferred to the next process in a short time can be obtained.

<Hard mortar>
The mortar cured body can be formed by curing polymer cement mortar. The mortar hardened body formed in this way is excellent in strength development when it is integrated with concrete pillars and beams constituting the reinforcing structure of an existing building. For this reason, the construction period of a reinforcement construction method can be shortened. Moreover, since it has high compressive strength, the earthquake resistance of the existing building can be improved.

Compressive strength is JIS A 1108: 2006 “Concrete compression test method” in which a mortar is filled in a cylindrical frame having an inner diameter of 5 cm and a height of 10 cm, demolded after 24 hours, and then cured underwater until a predetermined age. Is a value (N / mm ² ) measured according to the above.

The compressive strength at 7 days of age of the mortar cured body measured by the above 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.

  By using a mortar hardened body having a strength development property that can reach the above-mentioned compressive strength at a material age of 7 days, the construction period of the reinforcing method can be further shortened.

The compressive strength of the cured mortar body as measured by the above test method is 28 days old.
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-described range, even more excellent seismic performance can be exhibited when integrated with a reinforcing concrete column or beam.

  Subsequently, the reinforcing structure 2 will be described in more detail with reference to FIGS. 2 and 3. A vertical reinforcing bar 14, a horizontal reinforcing bar 15, and a mesh member M are provided in the reinforcing column part 9, the reinforcing beam part 10, and the reinforcing intersection part 11 constituting the reinforcing structure 2.

  The vertical reinforcing bar 14 is disposed at a position corresponding to the column portion 4 and extends in the same direction as the extending direction of the column portion 4. The vertical reinforcing bars 14 are arranged through the reinforcing pillars 9 and the reinforcing intersections 11 along the vertical direction. The vertical reinforcing bar 14 includes a main reinforcing bar 16 and a shear reinforcing bar 17.

  The main reinforcing bars 16 extend in the extending direction of the vertical reinforcing bars 14. The plurality of main bars 16 are arranged in a rectangular shape when viewed from the vertical direction. The shear reinforcing bar 17 is connected to the main bar 16 so as to surround the plurality of main bars 16. The connection between the shear reinforcing bar 17 and the main bar 16 may be performed by, for example, welding or engagement using an engagement member such as a hook.

  The horizontal rebar 15 is disposed at a position corresponding to the beam portion 5 and extends along the same direction as the extending direction of the beam portion 5. The horizontal reinforcing bars 15 are arranged through the reinforcing beam portions 10 and the reinforcing intersection portions 11 along the horizontal direction. The horizontal reinforcing bar 15 includes a main reinforcing bar 19 and a shear reinforcing bar 20.

  The main bar 19 extends in the extending direction of the horizontal reinforcing bar 15. The plurality of main bars 19 are arranged in a rectangular shape when viewed from the horizontal direction. The shear reinforcing bar 20 is connected to the main bar 19 so as to surround the plurality of main bars 19. The connection between the shear reinforcing bar 20 and the main bar 19 may be performed by, for example, welding or engagement using an engagement member such as a hook. Hereinafter, the shear reinforcement bars 20 respectively disposed in the vicinity of both ends of the reinforcing beam portion 10 may be referred to as “shear reinforcement bars 20A” (see FIGS. 4 and 5).

Yield point of the steel to be used in the vertical rebar 14 and the horizontal rebar 15 may be a 390 N / mm ² or ^more, may also ^{490N / mm 2 ~1275N / mm 2} , may be ^{685N / mm 2 ~1275N / mm 2} . The tensile strength of the steel material may be a 560N / mm ² or ^more, may also ^{620N / mm 2 ~1500N / mm 2} , may be ^{800N / mm 2 ~1500N / mm 2} . “Yield point” and “tensile strength” as used in the present specification mean values measured in accordance with the method described in JIS Z2241-2011.

  The mesh member M is, for example, a metal lath (see JIS A 5505). As the mesh member M, for example, a flat lath, a hump lath, a corrugated lath, or a rib lath may be used. The mesh size of the mesh member M may be, for example, 5 mm to 20 mm. The mesh member M is disposed in the vicinity of both end portions of the reinforcing beam portion 10.

  The reinforcing structure 2 and the existing building 1 are connected by an anchor 21. One end side of the anchor 21 is embedded in the reinforcing structure 2 (in the reinforcing column part 9, in the reinforcing beam part 10, and in the reinforcing intersection part 11). The other end side of the anchor 21 is embedded in the existing building 1 (in the column part 4, the beam part 5, and the foundation part 8). The anchor 21 plays a role of transmitting vibration energy (for example, earthquake energy) applied to the existing building 1 to the reinforcing structure 2. As the anchor 21, for example, various known anchor bolts may be used.

  Subsequently, as an example, a method for constructing the reinforcing structure 2 in the existing two-story building 1 (a method for manufacturing the reinforcing structure 2) will be described with reference to FIGS. Below, the beam part 5 located in the lowest part and corresponding to the 1st floor part of the existing building 1 is called "beam part 5A" (1st beam part). The beam portion 5 which is adjacent to the beam portion 5A in the vertical direction and is located above the beam portion 5A and corresponding to the first-floor ceiling portion (second-floor floor portion) of the existing building 1 is referred to as “beam portion 5B” (second beam Part). The beam portion 5 that is adjacent to the beam portion 5B in the vertical direction and is located above the beam portion 5B and that corresponds to the second-floor ceiling portion of the existing building 1 is referred to as a “beam portion 5C”. The intersection 6 located at the end of the beam 5A is referred to as “intersection 6A” (first and second intersections). The intersection 6 located at the end of the beam portion 5B is referred to as “intersection 6B” (third and fourth intersections). The intersection 6 located at the end of the beam 5C is referred to as “intersection 6C”. The column portion 4 arranged in the horizontal direction between the beam portion 5A and the beam portion 5B is referred to as a “column portion 4A” (first and second column portions). The column portion 4 arranged in the horizontal direction between the beam portion 5B and the beam portion 5C is referred to as a “column portion 4B”.

  First, predetermined portions of the column part 4, the beam part 5 and the base part 8 are drilled with a drill or the like to form a plurality of holes. Next, the anchor 21 is inserted into these holes, and the column part 4, the beam part 5, the foundation part 8 and the anchor 21 are joined. For joining the column part 4, the beam part 5, the base part 8 and the anchor 21, for example, an epoxy adhesive may be used.

  Next, the vertical reinforcing bar 14 and the horizontal reinforcing bar 15 are arranged on the outer wall surface F of the existing building 1 and at positions corresponding to the column part 4, the beam part 5, and the intersection part 6 (see FIG. 4). In addition, the mesh members M are disposed at positions corresponding to the vicinity of both ends of the reinforcing beam portion 10 (see the same figure).

  Next, as shown in FIG. 5, a mold (first mold) FW <b> 1 is formed in a portion corresponding to the beam portion 5 </ b> A in the horizontal rebar 15. Accordingly, the portion of the horizontal reinforcing bar 15 is surrounded by the formwork FW1 and the outer wall surface F. The mesh member M is located at both ends of the space surrounded by the formwork FW1 and the outer wall surface F.

  Next, concrete is placed in the mold FW1. At this time, the uncured concrete is prevented from flowing out of the mold FW1 by the net members M located at both ends of the mold FW1. By removing the formwork FW1 after the concrete has hardened to become a hardened concrete body, the reinforcing beam portion 10 (first reinforcing beam portion) is formed at a position corresponding to the beam portion 5A. Hereinafter, the reinforcing beam portion 10 at a position corresponding to the beam portion 5A is referred to as a “reinforcing beam portion 10A”.

  Next, as shown in FIG. 6, a formwork (second and third formwork) FW <b> 2 is formed in a portion corresponding to the intersection 6 </ b> A of the vertical rebar 14 and the horizontal rebar 15. Thus, the portion of the vertical reinforcing bar 14 and the horizontal reinforcing bar 15 is surrounded by the formwork FW2 and the outer wall surface F.

Next, polymer cement mortar is filled into the mold FW2. Filling the mold FW2 with the polymer cement mortar is performed after the penetration resistance value of the concrete placed in the mold FW1 becomes 0.1 N / mm ² or more (for example, after about 2 hours have passed). If you can, you can. After the polymer cement mortar is hardened to form a mortar hardened body, the formwork FW2 is removed, so that the reinforcing intersection 11 (first and second) is formed at the position corresponding to the intersection 6A and at the end of the reinforcing beam 10A. Reinforced intersections) are formed. Hereinafter, the reinforcing intersection 11 at a position corresponding to the intersection 6A is referred to as a “reinforcing intersection 11A”. Here, the “penetration resistance value” is a value obtained by the test method described in JIS A 1147-2007 “Concrete setting time test method”.

  Next, as shown in FIG. 7, a mold (fourth and fifth mold) FW <b> 3 is formed in a portion corresponding to the column part 4 </ b> A in the vertical reinforcing bar 14. Accordingly, the portion of the vertical reinforcing bar 14 is surrounded by the formwork FW3 and the outer wall surface F.

  Similarly, as shown in FIG. 7, a mold (sixth mold) FW4 is formed in a portion of the horizontal reinforcing bar 15 corresponding to the beam portion 5B. Accordingly, the portion of the horizontal reinforcing bar 15 is surrounded by the formwork FW4 and the outer wall surface F. The mesh member M is located at both ends of the space surrounded by the mold FW4 and the outer wall surface F.

  Next, concrete is placed in the molds FW3 and FW4. The filling of the concrete into the mold FW3 takes place after the polymer cement mortar filled in the mold FW2 is in a semi-hardened state, that is, the joining time of the polymer cement mortar (for example, about 30 minutes to 2 hours). After that, you can do it. The net-like members M located at both ends of the mold FW4 prevent uncured concrete from flowing out of the mold FW4. By removing the formwork FW3 after the concrete has hardened to become a hardened concrete body, the reinforcing column 9 (first and second reinforcing column) is located on the reinforcing intersection 11A at a position corresponding to the column 4A. Is formed. Hereinafter, the reinforcing column 9 at a position corresponding to the column 4A is referred to as “reinforcing column 9A”. By removing the formwork FW4 after the concrete has hardened to become a concrete hardened body, the reinforcing beam portion 10 (second reinforcing beam portion) is formed at a position corresponding to the beam portion 5B and above the reinforcing beam portion 10A. Is done. Hereinafter, the reinforcing beam portion 10 at a position corresponding to the beam portion 5B is referred to as a “reinforcing beam portion 10B”.

  Next, as shown in FIG. 8, a formwork (seventh and eighth formwork) FW <b> 5 is formed in a portion corresponding to the intersection 6 </ b> B of the vertical rebar 14 and the horizontal rebar 15. Accordingly, the portion of the vertical reinforcing bar 14 and the horizontal reinforcing bar 15 is surrounded by the mold FW5 and the outer wall surface F.

Next, polymer cement mortar is filled into the mold FW5. The filling of the polymer cement mortar into the mold FW5 is performed after the penetration resistance value of the concrete placed in the molds FW3 and FW4 becomes 0.1 N / mm ² or more (for example, after about 2 hours have passed) ). By removing the mold FW5 after the polymer cement mortar has hardened to become a mortar cured body, the reinforcing intersection 11 (first and second) is formed at the position corresponding to the intersection 6B and at the end of the reinforcing beam 10B. Reinforced intersections) are formed. Hereinafter, the reinforcing intersection 11 at a position corresponding to the intersection 6B is referred to as a “reinforcing intersection 11B”.

  Next, as shown in FIG. 9, a mold FW <b> 6 is formed in a portion corresponding to the column part 4 </ b> B in the vertical reinforcing bar 14. Accordingly, the portion of the vertical reinforcing bar 14 is surrounded by the formwork FW6 and the outer wall surface F.

  Similarly, as shown in FIG. 9, a formwork FW <b> 7 is configured in a portion corresponding to the beam portion 5 </ b> C in the horizontal rebar 15. Accordingly, the portion of the horizontal reinforcing bar 15 is surrounded by the formwork FW7 and the outer wall surface F. The mesh member M is located at both ends of the space surrounded by the mold FW7 and the outer wall surface F.

  Next, concrete is placed in the molds FW6 and FW7. The filling of the concrete into the mold FW6 takes place after the polymer cement mortar filled in the mold FW5 has become semi-hardened, that is, the joining time of the polymer cement mortar (for example, about 30 minutes to 2 hours). After that, you can do it. The net-like members M located at both ends of the mold FW7 prevent uncured concrete from flowing out of the mold FW7. By removing the formwork FW6 after the concrete has hardened to become a concrete hardened body, the reinforcing pillar 9 (first and second reinforcing pillars) is located on the reinforcing intersection 11B at a position corresponding to the pillar 4B. Is formed. Hereinafter, the reinforcing column 9 at a position corresponding to the column 4B is referred to as a “reinforcing column 9B”. By removing the formwork FW7 after the concrete has hardened to become a hardened concrete body, the reinforcing beam portion 10 (second reinforcing beam portion) is formed at a position corresponding to the beam portion 5C and above the reinforcing beam portion 10B. Is done. Hereinafter, the reinforcing beam portion 10 at a position corresponding to the beam portion 5C is referred to as a “reinforcing beam portion 10C”.

  Next, as shown in FIG. 10, a formwork FW8 is configured in a portion corresponding to the intersection 6C in the vertical reinforcing bar 14 and the horizontal reinforcing bar 15. Thus, the portion of the vertical reinforcing bar 14 and the horizontal reinforcing bar 15 is surrounded by the mold FW8 and the outer wall surface F.

Next, polymer cement mortar is filled into the mold FW8. The filling of the polymer cement mortar into the mold FW8 is performed after the penetration resistance value of the concrete placed in the molds FW6 and FW7 becomes 0.1 N / mm ² or more (for example, after about 2 hours have passed) ). By removing the mold FW8 after the polymer cement mortar is cured to become a mortar cured body, the reinforcing intersection 11 is formed at a position corresponding to the intersection 6C and at the end of the reinforcing beam 10C.

  As described above, the reinforced structure 2 is provided in the existing building 1 and the reinforced building 3 is completed.

  By the way, when all the reinforcement pillar part 9, the reinforcement beam part 10, and the reinforcement cross | intersection part 11 are comprised with a mortar hardening body, while the extremely strong reinforcement structure 2 can be obtained, cost will increase significantly. . However, in the manufacturing method of the reinforcing structure 2 according to the present embodiment, the reinforcing column portion 9 and the reinforcing beam portion 10 are configured by a hardened concrete body, and the reinforcing intersection portion 11 is configured by a hardened mortar body. In addition, in the manufacturing method of the reinforced structure 2 according to the present embodiment, the reinforcing intersection portion 11 that is required to have a higher strength is configured by a mortar cured body having a compressive strength larger than that of the cured concrete body, and the reinforcing intersection portion 11 is as large as the reinforcing intersection portion 11. The reinforcing column portion 9 and the reinforcing beam portion 10 that do not require the above strength are formed of a hardened concrete. Therefore, it is possible to manufacture the reinforcing structure 2 at low cost while sufficiently reinforcing the existing building 1 with the reinforcing structure 2.

  In this embodiment, the reinforcement crossing part 11 by which larger intensity | strength is calculated | required is comprised by the mortar hardened | cured material with a compressive strength larger than a concrete hardened | cured material. Therefore, the strength of the reinforcing structure 2 is ensured even if the width of the reinforcing column portion 9 and the beam length of the reinforcing beam portion 10 are reduced as compared with the case where the entire reinforcing structure 2 is formed of a hardened concrete body. The Therefore, not only is the appearance of the existing building 1 provided with the reinforcing structure 2 difficult to be damaged by the reinforcing column portion 9 and the reinforcing beam portion 10, but also the reinforcing structure 2 having a high degree of design freedom and high design properties. It becomes possible to provide.

  In the present embodiment, a polymer cement mortar having a curing characteristic in which the splicing time is 30 minutes to 2 hours is used. Therefore, the concrete can be placed in the mold FW3 (see FIG. 7) after the joining time has elapsed. Therefore, it is possible to quickly place concrete without waiting for the polymer cement mortar to harden. For example, the reinforcing structure 2 for two layers can be constructed per day. As a result, the construction period of the reinforcing structure 2 becomes extremely short. In addition, in this embodiment, concrete placement and polymer cement mortar are sequentially performed from the bottom to the top. Therefore, it is necessary when placing concrete in the locations corresponding to the pillars 4 and the beam portions 5 of the existing building 1 and then filling the locations corresponding to the intersections 6 of the existing building 1 with polymer cement mortar. There is no need for special components such as concrete leakage prevention. Therefore, the existing building 1 can be reinforced extremely easily.

  As mentioned above, although embodiment of this invention was described in detail, you may add a various deformation | transformation to said embodiment within the range of the summary of this invention. For example, the reinforcing structure 2 may not be in contact with the outer wall surface F of the existing building 1 as in the above embodiment. Specifically, as shown in FIG. 11, the reinforcing structure 2 is separated from the outer wall surface F, and the reinforcing structure 2 and the outer wall surface F are connected by a reinforcing beam portion 28 and a reinforcing slab 29. It may be. The reinforcing beam portion 28 extends between the intersection 6 of the existing building 1 and the reinforcement intersection 11 of the reinforcing structure 2. The reinforcing slab 29 is arranged so as to expand in the horizontal direction in a region surrounded by the beam portion 5 of the existing building 1, the reinforcing beam portion 10 of the reinforcing structure 2, and the reinforcing structure 2. The reinforcing beam portion 28 and the reinforcing slab 29 may be made of reinforced concrete, or may be made of precast concrete.

  If it has the function which can control the outflow of unhardened concrete, it may replace with mesh member M, and may adopt other members which show shapes other than a mesh.

  In the present embodiment, after the vertical reinforcing bar 14 and the horizontal reinforcing bar 15 corresponding to the entire reinforcing structure 2 are configured, the concrete is placed in the mold and filled in the mortar mold. When the existing building 1 is a high-rise building, first, the vertical reinforcing bar 14 and the horizontal reinforcing bar 15 corresponding to the lower layer side of the reinforcing structure 2 are partially configured and placed in a concrete formwork. After the mortar is filled into the mold, the vertical reinforcing bar 14 and the horizontal reinforcing bar 15 corresponding to the higher layer side of the reinforcing structure 2 are partially configured, and the concrete is placed in the mold. You may perform filling in the mold of mortar.

  In the present embodiment, the formwork is sequentially configured for the portions constituting the hardened concrete body or the hardened mortar body. However, the formwork is formed in advance on a part or all of the vertical reinforcing bars 14 and the horizontal reinforcing bars 15, and the reinforcing beams are first formed. The reinforcing structure 2 is constructed in the order of the portion 10A, the reinforcing intersection 11A, the reinforcing pillar 9A and the reinforcing beam portion 10B, and the reinforcing intersection 11B. Also good.

  In the present embodiment, the concrete is placed in the mold FW3 after the piercing time of the polymer cement mortar has elapsed. However, after the initial setting time of the setting of the polymer cement mortar has elapsed, the concrete mortar is moved into the mold FW3. The concrete may be placed.

  The order of removing the molds FW1 to FW8 is not limited to the above embodiment. For example, after the polymer cement mortar filled in the mold FW8 becomes a mortar hardened body, the molds FW1 to FW8 may be removed.

  Formwork FW1, FW4, and FW7 configured in a portion corresponding to the beam portion 5 in the horizontal reinforcing bar 15 includes a bottom plate and a side plate facing the outer wall surface F, and may not have a top plate. In this case, the concrete can be easily placed in the mold from above. On the other hand, the molds FW1, FW4, and FW7 configured in the portion corresponding to the beam portion 5 of the horizontal reinforcing bar 15 may be composed of a bottom plate, a side plate facing the outer wall surface F, and a top plate. In this case, for example, concrete can be placed in the mold from an opening formed in the top plate.

  Hereinafter, the contents of the present invention will be described in more detail with reference to Examples, Comparative Examples, and Reference Examples, but the present invention is not limited to the following Examples.

(Examples 1-4, Comparative Example 1, Reference Examples 1 and 2)
[Preparation of polymer cement composition]
The raw materials shown in the following (1) to (7) were prepared.

(1) Cement • Early strength Portland cement (JIS R 5210: 2009, Blaine specific surface area: 4600 cm ² / g)
(2) Fine aggregate-Silica sand (Test results of JIS A 1102: 2014 are shown in Table 1)

(3) Inorganic expansive material-Quicklime-Gypsum-Calcium sulfoaluminate expansive material (4) Fluidizer-Polycarboxylic acid fluidizer (5) Synthetic resin fiber-Vinylon fiber (fiber length: 12 mm)

(6) Re-emulsifying powder resin ・ Powder resin mainly composed of acrylic / vinyl acetate / veova copolymer resin (glass transition temperature (Tg): 14 ° C.)
(7) Setting accelerator-Sodium aluminate-Aluminum sulfate-Calcium formate

  106 parts by mass of fine aggregate, 5.7 parts by mass of an inorganic expansion material, 0.23 parts by mass of a fluidizing agent, 0.37 parts by mass of synthetic resin fibers, re-emulsified powder resin with respect to 100 parts by mass of the above-mentioned cement 0.37 parts by mass (Formulation A) was further blended, and further, a setting accelerator was blended in Formulation A in parts by mass with respect to 100 parts by mass of the cement shown in Table 2. Examples 1-4, Comparative Example 1, and Reference Example 1, 2 polymer cement compositions were prepared.

[Preparation of polymer cement mortar]
Water was blended at a water powder ratio of 0.155 and kneaded to 1500 g of the polymer cement composition blended at the above-described mass ratio to prepare a polymer cement mortar. The kneading was performed at a low speed for 3 minutes using a Hobart mixer under the conditions of a temperature of 20 ° C. and a relative humidity of 65%. The physical properties of the polymer cement mortar thus obtained were evaluated by the following methods.

[Method for evaluating physical properties]
(1) Measuring method of flow value Under the conditions of a temperature of 20 ° C. and a relative humidity of 65%, a cylindrical vinyl chloride pipe having an inner diameter of 50 mm and a height of 100 mm was placed on a 5 mm thick sheet glass. At this time, one end of the pipe made of vinyl chloride was placed in contact with the polished plate glass, and the other end was placed upward. Polymer cement mortar was poured from the opening on the other end side, the mortar was filled into the vinyl chloride pipe, and then the pipe was pulled up vertically. After the spread of the mortar stopped, the diameter (mm) in two directions orthogonal to each other was measured using a caliper. The average value of the measured values was taken as the flow value (mm). Table 3 shows the obtained flow values.

(2) Measuring method of splicing time Plan used for penetration test in Vicat needle device for setting time described in JIS R 5201-1997 “Cement physical testing method” under conditions of temperature 20 ° C. and relative humidity 65% Install a jar (standard stick), fill a hard rubber cement paste container with polymer cement mortar, leave it to stand, and inject water into the polymer cement composition in accordance with the above-mentioned method for measuring the initial setting of JIS. From this, the time until no trace of the plunger (standard bar) remained on the surface of the remer cement mortar was measured. Table 3 shows the obtained joining time.

(3) Initial time measurement method Under the conditions of a temperature of 20 ° C. and a relative humidity of 65%, the initial time is measured in accordance with the method for measuring the initial setting described in JIS R 5201-1997 “Cement physical test method”. did. Table 3 shows the obtained first departure time.

(4) Method for measuring the end time Under the conditions of a temperature of 20 ° C. and a relative humidity of 65%, the end time is measured in accordance with the method for measuring the end of setting described in JIS R 5201-1997 “Physical Test Method for Cement”. did. The resulting termination times are shown in Table 3.

  As shown in Table 3, the polymer cement mortar of Comparative Example 1 had a flow value of 160 mm or more, but the joining time exceeded 2 hours. The polymer cement mortars of Reference Examples 1 and 2 had a flow value of 160 mm or less. On the other hand, it was confirmed that all of the polymer cement mortars of Examples 1 to 4 have excellent joining time and start time. The polymer cement mortars of Examples 1 to 3 each had a flow value of 180 mm or more, and were confirmed to have particularly excellent fluidity. Since these polymer cement mortars have good fluidity, the polymer cement mortar is excellent in filling into a mold and the like, and can move to the next step in a short time. Therefore, it can be suitably used for a reinforcement method for an existing building that requires a short delivery time.

  DESCRIPTION OF SYMBOLS 1 ... Existing building, 2 ... Reinforcement structure, 3 ... Reinforced building, 4 ... Column part, 4A ... Column part (1st and 2nd column part), 5 ... Beam part, 5A ... Beam part (1st Beam section), 5B ... Beam section (second beam section), 6 ... Intersection section, 6A ... Intersection section (first and second intersection sections), 6B ... Intersection section (third and fourth intersection sections) , 9 ... Reinforcing column part, 10 ... Reinforcing beam part, 11 ... Reinforcing crossing part, 14 ... Vertical rebar, 15 ... Horizontal rebar, 20, 20A ... Shear reinforcing rebar, F ... Outer wall surface, FW1 ... Formwork (first Formwork), FW2 ... formwork (second and third formwork), FW3 ... formwork (fourth and fifth formwork), FW4 ... formwork (sixth formwork), FW5 ... formwork (7th and 8th formwork), M ... mesh member.

Claims (5)

The first and second column portions that are adjacent in the horizontal direction, the first and second beam portions that are adjacent in the vertical direction and are arranged in this order upward, the lower end of the first column portion, and the first A first intersection located at a location where one end of the beam portion intersects, and a second intersection located at a location where the lower end of the second column portion and the other end of the first beam portion intersect. , A third intersection located at a location where the upper end of the first pillar and the one end of the second beam intersect, and the upper end of the second pillar and the second beam A method of manufacturing a reinforcing structure for reinforcing an existing building comprising a fourth intersection located at a location where the other end of
A step of arranging reinforcing bars at positions corresponding to the outer wall surface side of the existing building and the first and second pillars, the first and second beam parts, and the first to fourth intersections;
After the step of placing the reinforcing bars, placing concrete in a first formwork configured in a portion corresponding to the first beam portion of the reinforcing bars;
After the step of placing concrete in the first formwork, a step of filling polymer cement mortar into a second formwork formed in a portion corresponding to the first intersection of the reinforcing bars. When,
After the step of placing concrete in the first formwork, a step of filling polymer cement mortar into a third formwork formed in a portion corresponding to the second intersection of the reinforcing bars. When,
After the step of filling the second formwork with the polymer cement mortar and after the joining time of the polymer cement mortar has elapsed, the reinforcing bar is configured in a portion corresponding to the first pillar portion. Placing concrete in a fourth formwork;
After the step of filling the polymer mold mortar into the third mold and after the joining time of the polymer cement mortar has elapsed, the reinforcing bar is configured in a portion corresponding to the second column portion. Placing the concrete in the fifth formwork,
After the step of arranging the reinforcing bars, placing concrete in a sixth mold formed in a portion corresponding to the second beam portion of the reinforcing bars;
After the step of placing concrete in the fourth to sixth molds, a polymer cement mortar is placed in a seventh mold formed in a portion corresponding to the third intersection of the reinforcing bars. Filling, and
After the step of placing concrete in the fourth to sixth molds, a polymer cement mortar is placed in an eighth mold formed in a portion corresponding to the fourth intersection of the reinforcing bars. Filling the process,
The joining time of the polymer cement mortar is 30 minutes to 2 hours,
The compressive strength of the mortar cured body polymer cement mortar has hardened the much larger than the compressive strength of concrete cured product said concrete has cured,
The joining time of the polymer cement mortar is the time from pouring water into the polymer cement composition until reaching the semi-cured state,
The semi-cured state is measured in accordance with JIS R 5201-1997 “Cement physical test method” by replacing the initial needle for measuring the initial solidification with a plunger for penetration test. The manufacturing method which is a state when the back of the said plunger no longer remains on the surface of .   The step of placing concrete in the fourth mold is completely after the step of filling the second mold with polymer cement mortar and after the polymer cement mortar reaches a semi-hardened state. Placing concrete in the fourth formwork before curing,
  The step of placing concrete in the fifth mold is completely after the step of filling the third mold with polymer cement mortar and after the polymer cement mortar reaches a semi-hardened state. The manufacturing method according to claim 1, comprising placing concrete in the fifth mold before being cured.   The step of placing concrete in the fourth mold is after the step of filling the second mold with polymer cement mortar and when the polymer cement mortar is in a semi-hardened state. Including placing concrete in a fourth formwork;
  The step of placing concrete in the fifth mold is after the step of filling the third mold with polymer cement mortar and when the polymer cement mortar is in a semi-hardened state. The manufacturing method of Claim 1 or 2 including placing concrete in a 5th formwork. After the step of placing the reinforcing bars, and before the step of placing concrete in the first formwork, the first shape is located inside each end of the first formwork. Arranging the mesh member;
After the step of placing the reinforcing bars, and before the step of placing concrete in the sixth formwork, a second position is located inside each end of the sixth formwork. The manufacturing method according to any one of claims 1 to 3 , further comprising a step of arranging a net member. The polymer cement mortar includes a cement composition, a fine aggregate, a fluidizing agent, a re-emulsifying powder resin, a synthetic resin fiber, and a setting accelerator, and water.
The manufacturing method according to any one of claims 1 to 4, wherein the polymer cement composition contains 0.20 parts by mass to 2.00 parts by mass of the setting accelerator with respect to 100 parts by mass of the cement. .

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