KR20100029714A - Reinforcing structure of house's concrete foundation and reinforcing method thereof - Google Patents

Abstract

PURPOSE: A reinforcement structure of housing concrete foundation and a reinforcing method are provided to be mounted outside and in a narrow place. CONSTITUTION: A binder(5) is charged in the concave groove and the continuous fabric reinforcement member is stuck on the concrete foundation. The continuous fabric reinforcement member and the binder are protected by attaching a board and covering an epoxy resin(6) and polymer cement on the side surface of the concrete foundation.

Description

Reinforcement structure of concrete foundation for house and its reinforcement method {REINFORCING STRUCTURE OF HOUSE'S CONCRETE FOUNDATION AND REINFORCING METHOD THEREOF}

This invention relates to the reinforcement structure of the concrete foundation of an existing house generally called single-family house, and its reinforcement method.

The foundation of the house generally called single-family house built by conventional framework method, traditional method, wood frame method, wood prefab method, 2 × 4 method, etc., reinforcement in concrete foundation in new house after 2000 Reinforcement was enacted under the Building Standards Act (May 23, 2000, under the 1st notice of the Ministry of Construction).

However, in the houses previously constructed, there are various constructions, and there are concrete foundations without a base plate, concrete foundations with a base plate, and even reinforced concrete foundations with a base plate in 2000. Previously, the amount of rebar was not seen in many places, and the house is still used.

6 shows a graph of the relationship between the load and the displacement when a bending force is applied to the concrete foundation of the rootless structure.

The width of the foundation used for the test was 150 mm and the height was 600 mm.

As shown in Fig. 6, when a bending force of about 34 kN acts, cracks are generated in the foundation, and after the cracking, the bending force cannot already be tolerated.

In addition, the displacement amount at the time of a crack is 1 mm or less, and it turns out that only a very slight deformation | transformation can be tolerated.

As a matter of course, the foundation to which the reinforcing bar is not arranged is small, but as described above, the force that withstands the bending force during an earthquake is small.

In the case of expanding and rebuilding a house having such a foundation, it is necessary to conform not only the extension portion but also the foundation of the existing portion to the above-mentioned notice No. 1347, and the concrete that reinforces the steel on the side of the concrete foundation of the foundation. It was necessary to reinforce by constructing parts and linking them together.

Such a reinforcement method is shown in FIGS. 15 and 16.

As shown in FIG. 15, the surface of a part of the standing part a of the existing foundation is scraped off, and the reinforced concrete part b is added only to the side, and what is shown in FIG. A part of the standing part a and the bottom plate part c is scraped off, and the reinforced concrete part b is formed in the side.

This reinforcement method is employed not only for expansion and contraction but also for reinforcement when a crack occurs in the foundation due to an earthquake or the like.

However, in many cases, it is very difficult to employ the reinforcement method described above.

For example, in an existing house built on a narrow site, there is a case where there is no space at a boundary with an adjacent site, and it is impossible to add a foundation outside the foundation.

It is also considered that the worker peels off the floor and enters the building under the building floor. However, it is very difficult to beat the concrete and place it on the side of the indoor side of the foundation.

Japanese Patent No. 4084618 discloses a method of reinforcing concrete such as an elevated roadway or a bridge beam or floorboard using a synthetic resin rod (continuous fiber reinforcing material).

The above publication is a reinforcement method at the time of crack occurrence in an overpass, and is different from the basic reinforcement method without a reinforcing bar in a house.

It is difficult to bend the continuous fiber reinforcement in the field because it is difficult to bend the continuous fiber reinforcement in the field, and it is difficult to connect the reinforcement having a certain length and secure the continuity thereof. It is difficult to secure continuity.

[Patent Document 1] Japanese Patent No. 4084618

The problem to be solved is to make it possible to reinforce the foundation of the house without reinforcement by simple construction, to allow construction at a narrow site, and to allow construction from the indoor side.

In the reinforcement structure of the concrete foundation of the house according to the present invention, each of the continuous fiber reinforcement is disposed in at least two longitudinally continuous concave grooves formed on at least one side of the left and right sides of the concrete foundation of the existing house,

Embedding the adhesive in the groove to fix the continuous fiber reinforcement to integrate with the concrete foundation,

The continuous fiber reinforcement and the adhesive are protected by coating or applying an epoxy resin, polymer cement, or the like to the side surface of the concrete foundation to which the continuous fiber reinforcement is fixed.

In the reinforcing structure of another house-concrete foundation according to the present invention, two concave grooves are formed in parallel and spaced apart at appropriate intervals above and below the side surfaces of the concrete foundation.

In the reinforcing structure of another house-concrete foundation according to the present invention, two concave grooves are provided to be concave in a shape in which a shoulder strap is obliquely arranged on the side surface of the concrete foundation, and intersected.

In the reinforcing structure of another house-concrete foundation according to the present invention, in addition to the two concave grooves, concave grooves are also formed in the vertical direction of the side face of the concrete foundation, and a continuous fiber reinforcement is fixed in these concave grooves.

In the reinforcing structure of another house-concrete foundation according to the present invention, a part of two or more continuous fiber reinforcing materials overlap each other by a length of 30 times or more of the diameter of the reinforcing material in the concave grooves, and are integrally fixed by being embedded with an adhesive material.

In addition, the reinforcement structure of the housing concrete foundation according to the present invention,

In the corner of the concrete foundation, concave grooves in the transverse direction are formed concave on the side thereof,

A straight continuous fiber reinforcement is placed in the concave groove so that its end reaches near the corner,

The hook-shaped continuous fiber reinforcement which bent the middle part beforehand is arrange | positioned in the recessed groove so that it may spread to right and left according to the said corner,

The ends of the straight continuous fiber reinforcement and the continuous continuous fiber reinforcement of the hook shape overlap each other,

It is characterized in that the continuous fiber reinforcement is fixed by embedding the adhesive in the recessed groove.

In addition, the reinforcement structure of the housing concrete foundation according to the present invention,

In the T-shaped butt of the concrete foundation, a through hole is formed over the intersection,

Concave grooves connected to the through-holes are continuously formed at the left and right of the intersection portion,

In the through hole of the intersection portion, a connecting continuous fiber reinforcement is arranged to protrude its left and right ends from the through hole into the concave groove,

The ends of the continuous fiber reinforcement disposed on the left and right of the intersection portion and the ends of the continuous fiber reinforcement overlap each other,

The continuous fiber reinforcement is fixed by embedding the adhesive in the recess and the through hole.

Another reinforcement method for a concrete foundation of a house according to the present invention forms a concave groove by a cutter on at least one side of the left and right sides of the concrete foundation of an existing house, and arranges a continuous fiber reinforcement in each concave groove. ,

Embedding the adhesive material in the groove to fix the continuous fiber reinforcement in the concave groove to integrate with the stem grass,

The continuous fiber reinforcement and the adhesive are protected by coating or applying an epoxy resin, polymer cement, or the like to the side surface of the concrete foundation to which the continuous fiber reinforcement is fixed.

Moreover, in the reinforcement method of the other house concrete foundation which concerns on this invention, a continuous fiber reinforcement is embedded in the indoor side of the concrete foundation, and is fixed.

The present invention has the configuration as described above, and achieves at least one of the following effects.

<a> Since a concave groove is formed in the surface of a concrete foundation and a continuous fiber reinforcement is embedded and fixed in it, it is not necessary to make the width | variety of the foundation itself thick, and it can also be constructed in a narrow site.

In addition, construction can be performed in a much shorter period of time, and the cost is lower than that of the method of linking the foundation to the side of the existing foundation.

<b> It is possible for workers to enter the floor, to form grooves on the indoor side of the foundation, and to bury and fix the continuous fiber reinforcement, to maintain good appearance, and to install on a narrow site. Become.

 <c> Since the continuous fiber reinforcing material is used as a substitute for the reinforcing bar, it does not rust, so even if it is buried in the concave groove formed on the base side, no covering like the reinforcing bar can be secured and the strength equivalent to that of the reinforcing bar can be secured.

<d> By forming a recessed groove, embedding a continuous fiber reinforcement therein, and fixing the surroundings with an adhesive material, it is difficult to remove the reinforcement from the recessed grooves, large bending that is incomparable with the reinforcement attached to the surface, etc. Reinforcement to withstand

<e> A groove is formed not only in the longitudinal direction of the foundation but also in the shape or vertical direction intersected in the X-shape, and the continuous fiber reinforcement is embedded and fixed, thereby making it possible to integrate and reinforce the foundation.

By applying or applying <f> epoxy resin, or by attaching a board, the continuous fiber reinforcement or adhesive is protected, and the reinforcement is no longer deviated from the concave groove, and the viscosity of the adhesive is also added to withstand greater bending force. It becomes the reinforcement structure that I can do.

<g> By using the continuous fiber reinforcement which overlapped the edge part of a continuous fiber reinforcement with each other, or bent in a hook shape, it becomes possible to ensure the continuity of a reinforcement in a corner part and a T-shaped butt | matching part.

Example 1

EMBODIMENT OF THE INVENTION Hereinafter, this invention is demonstrated in detail based on the Example shown in drawing.

 <1> continuous fiber reinforcement

The continuous fiber reinforcing material 1 used in the present invention is formed by impregnating a fiber binder with a continuous fiber, curing the molded fiber, and forming a bundle of unidirectional reinforcing materials, continuous fibers, or squeezing them together.

The reinforcing fiber of the continuous fiber reinforcing material is a fiber continuous in the entire length, such as homopolymerized aramid fiber, copolymerized aramid fiber, carbon fiber, glass fiber, high strength polyethylene fiber, high strength polyarylate fiber, PBO fiber or vinylon fiber. use.

Not only one type of fiber, but also plural types can be adopted.

As the bonding material for bonding these reinforcing fibers, one or more kinds of epoxy resins, epoxy acrylate resins, vinyl ester resins, unsaturated polyester resins, or cement binders are used to bond the fibers.

The shape of the continuous fiber reinforcing material 1 is a rod shape having irregularities formed on the surface, a rectangular cross-sectional shape having a protrusion on the surface, a braid shape, a lattice shape, a strand shape, a strand cross-sectional shape, and sand adhesion treatment on the surface. It is effective to ensure adhesion with an adhesive material or concrete, such as the shape performed.

<2> strength of continuous fiber reinforcement

The continuous fiber reinforcement 1 is much higher in strength than ordinary reinforcing bars, and a sufficient reinforcing effect can be expected from a reinforcing material having a small cross-sectional area.

As an example, the trademark power alast FA [release mold cross-section which integrated the copolymerized aramid fiber (trade name Technora) with vinyl ester resin] which is the aramid rod of the applicant of the present invention Goshin house care ring manufactures at the outer diameter of 8 mm. The guaranteed yield strength of is 81.4 kN, which is almost comparable to the tensile strength (286.5 mm 2 × 295 N / mm 2 = 84.5 kN) of the D19 rebar of SD295A.

Since the amount of reinforcement specified in the construction notice 1347 is to arrange one reinforcing bar each having a diameter of 12 mm or more on the upper part of the upright part of the foundation and the lower bottom plate, when the continuous high-strength fiber reinforcing material 1 is used, It turns out that it is possible to arrange | position the reinforcement material of the yield strength more than the requested rebar amount easily.

In addition, the continuous fiber reinforcement 1 is generally light in specific gravity, and in the case of aramid rod, there is only a specific gravity of about 1.31 g / cm 2.

For this reason, compared with the rebar of specific gravity 7.8 g / cm <3>, it is much lighter as a reinforcement material, and it is easy to work in the narrow space under a floor, and it is a big merit.

Moreover, since it is made of resin, there is no rust, there is no need for covering like rebar, and there is no problem even when it is embedded in the recessed groove formed in the surface.

<3> recessed groove

Concave grooves 4 are formed on one side of the left and right sides of the standing portion 3 of the concrete stem grass 2 of the existing house, and the side to be the indoor side in the embodiment.

In the drawings, houses are omitted.

The recessed grooves 4 are formed by cutting with a U-shaped cutter (diamond cutter). In the embodiment of FIG. 1, the recessed grooves 4 are spaced apart from each other at appropriate intervals near the upper end and the lower end of the standing portion 3 of the concrete foundation 2. Thus, the concave grooves 4 are formed in parallel in the longitudinal direction of the foundation, that is, in the horizontal direction.

Since the U-shaped cutter has a small surface to cut concrete, it is possible to greatly reduce the generation of dust by using it integrally with the current collector, and can greatly improve the working environment.

Further, the concave groove is cut into thin grooves at a suitable interval (approximately +2 to 10 mm outside diameter of the continuous fiber reinforcing material to insert and fix) with a conventional concrete cutter. It can also be formed by scraping concrete.

As a cross-sectional shape of the groove | channel 4, various shapes, such as a U-shape, a rectangle, a valley, and the trapezoid which became wider at the bottom part, can be employ | adopted.

In the embodiment, the width thickness W of the foundation 2 is 150 mm, the height H is 600 mm, and the recessed grooves 4 are formed at the positions of 80 mm and 400 mm, respectively, from the upper end of the side surface.

<4> buried reinforcement

In the concave groove 4, the continuous fiber reinforcing material 1 (trade name Power Alast FAφ8) is embedded, and the adhesive material 5 is filled so as to fill the periphery of the continuous fiber reinforcing material 1, and the continuous fiber reinforcing material ( 1) is fixed in the groove (4).

As the adhesive material 5, an epoxy resin, an epoxy acrylate resin, a vinyl ester resin, an unsaturated polyester resin, a cement binder, or the like can be employed, and one or more of these are used.

In particular, an epoxy adhesive material (trade name Power Alast) containing aramid fibers manufactured by Koshinki Koshin House Care Co., Ltd., which is the present patent applicant, is excellent in both adhesive strength and strength and can be suitably used.

<5> action

The test body T1 reinforced as mentioned above is shown to FIG. 2 (A) and FIG. 2 (B).

In this test body T1, only the reinforcing material 1 is embedded and fixed in the recessed groove 4, resin is not applied to the side surface of the base 2, or the sheet | seat is not adhere | attached.

Suppose that the earthquake forces a test force T1 to be pushed upward at both ends and a downward force at the middle left and right.

The relationship between load and displacement at this time is shown in the graph of FIG.

When the bending force is applied, cracks occur in the concrete at about 40 kN, but the subsequent continuous fiber reinforcement 1 receives the bending force to withstand the greater bending force, and even after the bending load is removed, the elastic force of the reinforcement 1 is removed. It can be understood that the contraction causes the displacement amount to decrease.

<6> application

3, the test body of the 1st Example which formed the recessed groove 4 of the concrete foundation 2, and further apply | coated the epoxy resin 6 on the side surface which embedded and fixed the continuous fiber reinforcement material 1 (T2).

The epoxy resin adhesive 6 (brand name power alast) is applied to almost the entire surface of one side of the standing portion 3.

The graph of the load and displacement amount at the time of applying a bending force to such test body T2 is shown in FIG.

After the crack occurs in the concrete foundation 2, the continuous fiber reinforcement 1 and the applied epoxy resin adhesive 6 (trade name Power Alast) are subjected to more bending forces, and finally the elastic force of the reinforcement 1 The displacement amount is decreasing.

That is, it can be understood that by applying the adhesive material 6 to the side surface of the foundation 2, it is possible to withstand greater bending forces.

In addition, an epoxy resin may be coated, polymer cement, etc. may be coated or coated, or the board may be attached to protect the continuous fiber reinforcement 1 and the adhesive.

Example 2

<7> overlap of continuous fiber reinforcement

In Example 2 shown in FIG. 4, two continuous fiber reinforcement materials 1 are arrange | positioned in the concave groove 4, and in order to ensure the continuity, the part overlaps at least 30 times the diameter in length, It is the test body T3 of the Example embedded with the adhesive material 6, and was fixed and integrated.

In the above-mentioned concave groove 4, the continuous fiber reinforcing material 1 (trade name Power Alast FA φ8) is formed with an overlap portion O having a length (here 30 cm) of 30 times or more of the diameter to form the adhesive material 6 (trade name). Power alast] and integrated.

The graph of the load and displacement amount at the time of applying a bending force to this test body T3 is shown in FIG.

As in the graph of Fig. 7, it is found that the crack occurs in the concrete at about 40 KN, but the subsequent bending force is received by the continuous fiber reinforcing material 1 to withstand the large bending force.

Accordingly, it can be seen that the continuous fiber reinforcing material 1 maintains the continuity as the reinforcing structure by forming an overlap of 30 times or more in diameter in the concave groove 4 and fixing and integrating the same with the adhesive material 6.

Example 3

<8> with continuous fiber sheet

Shown in FIG. 5 is the test body T4 of the Example which arrange | positioned the continuous fiber reinforcement material on the rootless concrete foundation already shown in the item of the background art, and attached the continuous fiber sheet 7 to the surface part of it.

This test specimen is dedicated to the fracture of the concrete foundation of the rootless structure described above by bending test.

The crack 8 is generated in the middle part of the concrete foundation 2, and the continuous fiber sheet 7 which is aramid fiber is attached so that the crack 8 may be covered.

10 shows a graph of the load and the displacement when the bending force is applied to the test body T4.

It can be seen that the continuous fiber sheet 7 and the concrete portion withstand the initial bending force and can withstand a load larger than that reinforced with only the continuous fiber reinforcing material 1.

Thereafter, the load is temporarily reduced by peeling the continuous fiber sheet 7 from the crack portion, but the continuous fiber reinforcement 1 can again bear the bending load, and the maximum load is reinforced only by the continuous fiber reinforcement 1 only. It is equivalent to one case.

In this way, even if the foundation is a plain concrete foundation where cracks have already occurred due to the bending force, the present method can be used to restore and reinforce the bending strength beyond the original bending strength.

The continuous fiber sheet 7 is not used only in the case of repair in the case where such a crack 8 has arisen, but attaches the continuous sheet 7 to the full length of the side surface of the foundation concrete 2 with an adhesive material, and the reinforcing material is concave. It can also be used in order to prevent separation from the groove 4 and to integrate the continuous fiber reinforcement 1 and the concrete foundation 2.

Example 4

<9> Arrangement of Continuous Fiber Reinforcement

The continuous fiber reinforcing material 1 may not only form a horizontal concave groove 4a and embed it therein, but also form a concave groove 4b in an obliquely shouldered shape and embed it therein (Fig. 11).

Alternatively, the concave grooves 4c may also be formed in the vertical direction, and the continuous fiber reinforcement 1 may be embedded therein.

In this way, when the continuous fiber reinforcing material 1 partially crosses, the reinforcing material 1 embedded in one side can be continuously integrated, and the whole concrete foundation 2 can be integrated more.

Example 5

<10> corner part

12 shows the construction state of the corner part of the concrete foundation 2, and the continuous recessed groove 4 is formed in the corner part which consists of the concrete foundation 2 which forms a right angle, and is perpendicular to a factory. This is the case where the continuous fiber reinforcing material 9 formed by embedding is embedded.

Both ends of the continuous fiber reinforcing material 9 formed at right angles are overlapped with the straight continuous fiber reinforcing material 1 embedded in the concave groove 4 until just before the end, thereby securing strength and continuity at the corners. .

Example 6

<11> butt

13 is an example which ensured the continuity of the continuous fiber reinforcement 1 in the T-shaped butt | matching part of the concrete foundation 2.

The continuous fiber reinforcement 10 is connected to the hole penetrated by the butt portion, and both ends thereof are overlapped with the continuous fiber reinforcement 1 embedded in the concave groove 4 formed in the concrete foundation 2 on the left and right sides, respectively. Continuity is ensured.

Example 7

<12> reinforcement around the ventilation openings

14 shows the reinforcement around the ventilation opening 11, and forms the recessed groove 4d horizontally under the continuous fiber reinforcing material 1 cut | disconnected in the middle by the ventilation opening 11, and assists in this. The continuous fiber reinforcement 12 is arrange | positioned, and the continuous fiber reinforcement 13 which overlapped one part with the continuous fiber reinforcement 1 was embedded in the recessed groove 4e obliquely from left and right, and ensures continuity with the continuous fiber reinforcement 1 One example.

1 is a perspective view of a first embodiment of the present invention.

2: is a test body which resin is not apply | coated to a base, (A) is a side view, (B) is sectional drawing.

3: is a test body of a 1st Example, (A) is a side view, (B) is sectional drawing.

4 is a side view of the test body of the second embodiment.

5 is a test body of a third example, (A) is a side view, and (B) is a sectional view.

It is a graph which shows the load and displacement amount in the base of a root muscle.

FIG. 7 is a graph showing the load and the displacement in the test body of FIG. 1. FIG.

8 is a graph showing the load and the displacement amount in the test body of the first example.

9 is a graph showing the load and the displacement amount in the test body of the second example.

10 is a graph showing the load and the displacement amount in the test body of the third example.

11 is a side view of a concrete foundation of another embodiment.

12 is a perspective view of an embodiment of reinforcement at a corner portion.

13 is a perspective view of an embodiment of the reinforcement at the butt portion.

14 is a side view of an embodiment of the reinforcement around the vent.

15 is a cross-sectional view of a conventional reinforcement method.

16 is a cross-sectional view of a conventional reinforcement method.

<Explanation of symbols for the main parts of the drawings>

1: continuous fiber reinforcement 2: concrete foundation

3: standing part 4: concave groove

5: adhesive material 6: epoxy resin

7: continuous fiber sheet 8: crack

9: continuous fiber reinforcement 10: continuous fiber reinforcement

11: Ventilation opening 12: Continuous fiber reinforcement

13: continuous fiber reinforcement

Claims (9)

Continuous fiber reinforcement is arrange | positioned in the recessed groove which continued in the at least 2 longitudinal direction formed in the side surface of at least one side among the left and right sides of the concrete foundation of an existing house (single house), respectively, The adhesive is embedded in the recess to fix the continuous fiber reinforcement to integrate with the foundation, The reinforcing structure of the housing concrete foundation, wherein the continuous fiber reinforcing member and the adhesive are protected by painting or applying epoxy resin, polymer cement, or the like on the side surface of the concrete foundation to which the continuous fiber reinforcing material is fixed. . The reinforcement structure of a house-concrete foundation according to claim 1, wherein the two concave grooves are formed in parallel to be spaced apart at appropriate intervals above and below the side surfaces of the concrete foundation. The reinforcing structure for a house-concrete foundation according to claim 1, wherein the two concave grooves are provided concave in a shape in which a shoulder strap is obliquely arranged on the side surface of the concrete foundation, and are formed to cross each other. The concave groove is also formed in the vertical direction of the side surface of the concrete foundation in addition to the two concave grooves, and a continuous fiber reinforcement is fixed in these concave grooves. Reinforcement structure of the housing concrete foundation. The method according to any one of claims 1 to 3, wherein a part of the two or more continuous fiber reinforcements overlap each other in lengths of at least 30 times the diameter of the reinforcement in the concave grooves, and are embedded with an adhesive material to be integrally fixed. Reinforcement structure of house concrete foundation to make. In the corner of the concrete foundation, concave grooves in the transverse direction are formed concave on the side thereof, A straight continuous fiber reinforcement is placed in the concave groove so that its end reaches near the corner, The hook-shaped continuous fiber reinforcement which bent the middle part beforehand is arrange | positioned in the recessed groove so that it may spread to right and left according to the said corner, The ends of the straight continuous fiber reinforcement and the continuous continuous fiber reinforcement of the hook shape overlap each other, Reinforcement structure of a concrete foundation of a house, characterized in that the continuous fiber reinforcement is fixed by embedding the adhesive in the recessed groove. In the T-shaped butt of the concrete foundation, a through hole is formed over the intersection, A concave groove connected to the through hole is continuously formed at left and right sides of the intersection portion, In the through hole of the intersection portion, a connecting continuous fiber reinforcement is disposed and the left and right ends thereof protrude from the through hole into the recesses, Overlapping the ends of the continuous fiber reinforcement disposed on the left and right of the intersection with the ends of the connecting continuous fiber reinforcement, Reinforcement structure of the housing concrete foundation characterized in that the continuous fiber reinforcement is fixed by embedding the adhesive material in the recess and the through hole. A concave groove is formed by a cutter in at least one side of the left and right sides of the concrete foundation of the existing house, A continuous fiber reinforcement is placed in each recess, Embedding the adhesive material in the groove to fix the continuous fiber reinforcement in the concave groove to integrate with the stem grass, The reinforcement method of the home concrete foundation, wherein the continuous fiber reinforcement and the adhesive are protected by painting or applying epoxy resin, polymer cement, or the like on the side surface of the concrete foundation on which the continuous fiber reinforcement is fixed. . 10. The method of claim 8, wherein the continuous fiber reinforcement is embedded in a recessed groove formed concave on the indoor side of the concrete foundation.

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