JPH0953328A - Reinforcing structure for beam or column - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a shearing reinforcement for a concrete body part around a beam or a column integrally incorporated with a floor slab or a wall, which is more sure and firm than those of a conventional one. SOLUTION: In the reinforcement for a concrete body part 1 around a beam by use of a fiber reinforced sheet 4, an overhanging part 3a of the beam 3 is surrounded by the fiber reinforced sheet 4, and the opposite end parts of the fiber reinforcing sheet 4 are firmly held between a pair of angle members 8 and the concrete body part 1. Meanwhile, flat bars 6 are laid on the upper surface 2b of a floor slab at a position where it is overlapped with the overhanging part 3a, and these bars 6 and the angle members 8 are fastened together by means of high tension bolts 11 and the like piercing through the floor slab 2, and accordingly, the concrete body part 1 is restrained by a reinforcing cross- section of a completely closed type.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reinforcing structure of a beam or a column for attaching a fiber reinforcing sheet to an existing concrete skeleton portion where the beam or the column projects from a floor slab or a wall to reinforce it.

[0002]

2. Description of the Related Art An existing concrete skeleton portion a around a beam b is constructed by integrating a beam b and a floor slab c as shown in FIG. 6, and an upper part of the beam b is integrally formed on the floor slab c. While being embedded, most of the other beams b project under the floor slab c. Conventionally, when reinforcing the existing concrete skeleton part a around the beam b, a fiber reinforced sheet e is attached around the projecting part d of the beam b projecting from the floor slab c so as to surround it. (See Japanese Patent Publication No. 4-77104).

[0003]

By the way, in the prior art, as described above, the fiber reinforcing sheet e is attached only to the projecting portion d of the beam b, which is not sufficient as a reinforcing structure. there were. That is, when the reinforcing state of the concrete skeleton portion a to be reinforced is seen in cross section, FIG.
As is clear from the above, the fiber reinforced sheet e is not in a state of surrounding the concrete skeleton portion a which is the portion to be reinforced, but has an open cross section as a reinforcement form. With such reinforcement by the open cross section, the constraint of the concrete skeleton part a by the fiber reinforced sheet e is insufficient, and therefore the structural integrity of the fiber reinforced sheet e and the concrete skeleton part a can be secured. Therefore, it is difficult to obtain a reliable shear reinforcement effect by the fiber-reinforced sheet e.
By the way, in the design criteria for reinforced concrete structures,
The hoop reinforcements and the like used for shear reinforcement are required to be arranged in a form that completely surrounds the concrete skeleton part to be reinforced, that is, in a completely closed type.

Such a situation was the same also in the column with the wall, that is, in the existing concrete skeleton portion around the column integrated with the wall. That is, as apparent from FIG. 6 as a plan sectional view, the existing concrete skeleton part a around the pillar b is constructed by integrating the pillar b and the wall c, and one side part of the pillar b is a wall. While being integrally embedded in c,
Most of the other columns b are constructed by projecting outward from the wall c. Therefore, even in such a concrete skeleton part a, the conventional reinforcement by the fiber reinforced sheet e has an open cross section, and the concrete skeleton part a is not sufficiently restrained by the fiber reinforced sheet e. It was not possible to secure the structural integrity with the concrete skeleton part a, and it was difficult to obtain a reliable shear reinforcement effect by the fiber reinforced sheet e.

The present invention provides a reinforcing structure for a beam or a column, which can make the shear reinforcement of the concrete skeleton portion around the beam or the column integrated with the floor slab or wall more reliable and stronger than before. To do.

[0006]

A first aspect of the present invention is a structure for reinforcing an existing concrete skeleton portion where a beam extends from a floor slab, and the beam is surrounded by the projecting portion of the beam. A fiber reinforced sheet attached, a pair of clamps arranged at both ends of the fiber reinforced sheet for clamping these between the concrete skeleton and the concrete skeleton part, and the side opposite to the projecting part of the beam. Reinforcement hardware arranged on the floor slab surface so as to wrap with the overhanging portion of the beam, and fasteners that are provided so as to penetrate the floor slab and that fasten the reinforcement hardware and the sandwiching hardware respectively. Consists of

With the above construction, in the first invention, the concrete skeleton portion around the beam is completely surrounded by the fiber reinforced sheet, the pair of clamp hardware, the fastener, and the reinforcement metal.

A second aspect of the present invention is a structure for reinforcing an existing concrete skeleton portion where a pillar projects from a wall, and a fiber reinforced sheet attached around the projecting portion of the pillar so as to surround it. And a pair of clamps disposed at both ends of the fiber reinforced sheet for clamping these between the concrete skeleton and the concrete skeleton, and the pillar on the wall surface opposite to the projecting portion of the pillar. A reinforcing metal member that is disposed so as to wrap with the projecting portion, and a fastener that is provided so as to penetrate the wall and that fastens the reinforcing metal member and the sandwiching metal member.

With the above construction, in the second aspect of the invention, the concrete skeleton portion around the pillar is completely surrounded by the fiber reinforced sheet, the pair of clamp hardware, the fastener, and the reinforcement metal.

In both the first invention and the second invention, it is preferable to fasten the sandwiching hardware to each other by a second fastener which penetrates a projecting portion of a beam or a pillar.
By doing so, the fixing strength of the overhanging portion of the fiber-reinforced sheet is increased.

[0011]

1 and 2, a floor slab 2 is shown.
The existing concrete skeleton portion 1 around the beam is shown in which the beam 3 is overhanging. The beam 3 is the lower surface 2 of the floor slab 2.
It is provided so as to integrally project from a in a stepwise manner, and has a rectangular cross section. In other words, the floor slab 2 is integrally constructed in the horizontal direction from the upper portions of both side surfaces of the beam 3 having a rectangular front cross-section. The reinforcing structure according to the present invention is applied to the existing concrete skeleton portion 1 constructed in this manner.

A fiber reinforced sheet 4 is provided so as to surround the beam 3 which is projected downward from the floor slab 2 and is exposed, that is, both side surfaces 3b and the lower surface 3c of the projecting portion 3a of the beam 3. Attached. Fiber reinforced sheet 4
At the time of attaching the base, first, a base treatment is performed to smooth the surface of the overhanging portion 3a, and a chamfering treatment is applied to a corner portion that is a boundary between both side surfaces 3b and the lower surface 3c of the overhanging portion 3a. Is applied. Moreover, you may make it apply a primer process after that. Pretreatments such as the base treatment, the chamfering treatment, and the primer treatment are carried out as necessary depending on the situation of the concrete skeleton portion 1.

After performing the necessary pretreatment on the surface of the projecting portion 3a of the beam 3 in this way, an adhesive 5 such as epoxy resin is applied to the surface of the projecting portion 3a (see FIG. 5). Then, the fiber reinforcing sheet 4 is attached to the entire surface of the protruding portion 3a from above. The fiber-reinforced sheet 4 is attached so as to cover at least the entire peripheral surface of the projecting portion 3a exposed from the floor slab 2. If necessary, the fiber reinforcing sheet 4 may be attached so as to reach the lower surface 2a of the floor slab 2 which is close to the overhanging portion 3a. In this case, it is preferable to apply the above-mentioned pretreatment to the lower surface 2a of the floor slab 2 up to the position where the fiber reinforcing sheet 4 is attached.

Regarding the size of the fiber reinforcing sheet 4, the size may be set so that one sheet can cover the entire surface of the overhanging portion 3a, or a plurality of fiber reinforcing sheets 4 are used. Alternatively, these may be attached to each other to cover the entire surface of the protruding portion 3a.

As the material of the fiber reinforced sheet 4 for reinforcing the concrete skeleton portion 1, various well-known materials can be applied. Particularly, a carbon fiber sheet is preferable from the viewpoint of tensile strength characteristics. .

As the form of the fiber-reinforced sheet 4, there are a form in which fibers are laid in one direction and formed into a cloth, or a form in which the cloth is impregnated with a resin in advance.

On the other hand, at the upper surface 2b of the floor slab 2 on the side opposite to the projecting portion 3a of the beam 3, that is, at the position which is the upper surface of the beam 3, a reinforcing metal member is disposed so as to be wrapped around the projecting portion 3a. . In this embodiment, the angle member or the flat bar 6 is used as the reinforcing metal member. As shown in FIGS. 1 to 3, a recess 7 wider than the beam width is formed on the upper surface 2b of the floor slab 2 by mounting it, and the recess 7 has a level adjustment (not shown). Mortar for the floor is applied. Then, the flat bar 6 is arranged on the spread mortar.

The flat bar 6 has a dimension longer than the beam width, is provided so as to cross the projecting portion 3a, and its both ends are provided outside the beam width. Further, a plurality of flat bars 6 are arranged in parallel in the longitudinal direction of the beam 3 at appropriate intervals.

On the lower surface 2a of the floor slab 2 below the positions of both ends of the flat bar 6, a pair of corner portions which are boundaries between the floor slab 2 and the overhanging portion 3a of the beam 3 are located. A pair of clamping hardware for clamping both ends of the fiber-reinforced sheet 4 surrounding 3a between the concrete skeleton portion 1, specifically, the corner portion is provided. As shown in FIGS. 1 and 2, and FIGS. 4 and 5, an L-shaped angle member 8 having a shape corresponding to a corner portion is adopted as the holding metal object in this embodiment.

When the angle member 8 is installed, the floor slab 2 is in contact with the upper surface 8a of the angle member 8 and the lower surface 2a of the floor slab 2 is provided with a level adjusting mortar 9 for setting a mounting position.
Is applied. Further, an adhesive 5 such as an epoxy resin is applied to the surface of the fiber reinforced sheet 4 where the side surface 8b of the angle member 8 is abutted, in order to stably and firmly adhere the both and to smooth the stress transmission. To be done. Then, a pair of angle members 8 are attached to the corner portions on both sides of the projecting portion 3a of the beam 3 via the adhesive 5 to the fiber reinforced sheet 4 and via the mortar 9 laid on the floor slab lower surface 2a. .

Further, the floor slab 2 is formed with a pair of through holes 10 extending from the upper surface 2b of the floor slab to the lower surface 2a thereof at both sides sandwiching the projecting portion 3a of the beam 3. Then, these through holes 10 are provided with fasteners which are inserted into the through holes 10 and fasten the flat bar 6 and the angle members 8 above and below the floor slab 2 while sandwiching the floor slab 2.

In this embodiment, as the fasteners, the high-tensile bolts 11 inserted into the through holes 10 and the nuts 12 screwed into the high-tension bolts 11 are used. The high tension bolt 1 is inserted from one side through holes (not shown) formed in the upper surface 8a of the angle member 8 respectively.
1 is inserted into the through hole 10, and the nut 12 is screwed from the opposite side to fasten the nut.

As a result, the concrete frame portion 1 around the beam is completely surrounded by the fiber reinforcing sheet 4, the angle member 8, the high tensile bolts 11 and the nuts 12, and the flat bar 6.

Further, as shown in FIGS. 1 and 5, the pair of angle members 8 installed at the corners on both sides of the overhanging portion 3a of the beam 3 have holes formed in their side surfaces 8b, as shown in FIGS. Through hole 13 formed in the projecting portion 3a.
The side surfaces 8b are fastened to each other by the PC steel rods 14 inserted into the inside and the fixing members 15 attached to both ends of the PC steel rods 14 to fix the same, whereby the overhanging portions of the fiber-reinforced sheet 4 are formed. The fixing strength for 3a is increased.

Further, as shown in FIG. 1, a mortar 16 for covering and protecting the fiber-reinforced sheet 4 is provided around the protruding portion 3a where the fiber-reinforced sheet 4 is exposed.

Further, a finishing material 17 is applied to the upper surface 2b of the floor slab 2 on which the flat bar 6 is arranged so as to cover and finish the applied portion.

As described above, in the present embodiment, when reinforcing the concrete skeleton portion 1 around the beam with the fiber-reinforced sheet 4, the fiber-reinforced sheet 4 surrounds the overhanging portion 3a of the beam 3. Both ends of the fiber reinforced sheet 4 are firmly sandwiched and supported between the concrete skeleton portion 1 by a pair of angle members 8 and, on the other hand, the floor slab upper surface 2b at the position where it overlaps the overhanging portion 3a is flat. Since the bar 6 is provided and the flat bar 6 and the angle member 8 are fastened via the high-tensile bolts 11 penetrating the floor slab 2 and the like, the fiber reinforced sheet 4 is caused by the stress generated in the concrete skeleton portion 1.
The tensile force generated at the angle member 8 and the high tension bolt 11
It is possible to make a reinforcement structure in a closed form that can be surely transmitted to the flat bar 6 via, that is, since the concrete skeleton part 1 can be restrained with a completely closed type cross section, a member for reinforcement and concrete. The structural integrity with the skeleton portion 1 can be sufficiently ensured, and the shearing reinforcement effect can be made reliable and stronger.

Next, the reinforcement of the existing concrete skeleton portion around the pillar where the pillar projects from the wall will be described. This embodiment can be understood by looking at FIG. 1 as a plan sectional view and FIG. 2 as a side view after rotating it by 90 °.

It can be considered that FIGS. 1 and 2 show an existing concrete skeleton portion 1 around a pillar in which a pillar 3 projects from a wall 2. The pillar 3 is the inner surface 2 of the wall 2.
It is integrally projecting from a in a stepwise manner and has a projecting cross section of a rectangular shape. In other words, the wall 2 is integrally formed in the width direction from the outer end portions on both side surfaces of the pillar 3 having a rectangular cross section.
Is being built. The reinforcing structure according to the present invention is applied to the existing concrete skeleton portion 1 constructed in this manner.

A fiber reinforced sheet 4 is provided around the pillar 3 exposed inwardly from the wall 2, that is, on both side surfaces 3b and the inner surface 3c of the overhanging portion 3a of the pillar 3 so as to surround it. Attached. When the fiber reinforced sheet 4 is attached, first, a base treatment is performed to smooth the surface of the overhanging portion 3a, and a corner portion which is a boundary between both side surfaces 3b of the overhanging portion 3a and the inner surface 3c is attached. Is chamfered. Moreover, you may make it apply a primer process after that. Pretreatments such as the base treatment, the chamfering treatment, and the primer treatment are carried out as necessary depending on the situation of the concrete skeleton portion 1.

After performing the required pretreatment on the surface of the projecting portion 3a of the pillar 3 in this way, an adhesive 5 such as an epoxy resin is applied to the surface of the projecting portion 3a (see FIG. 5). Then, the fiber reinforcing sheet 4 is attached to the entire surface of the protruding portion 3a from above. The fiber reinforcing sheet 4 is attached so as to cover at least the entire peripheral surface of the protruding portion 3a exposed from the wall 2. If necessary, the fiber reinforcing sheet 4 may be attached so as to reach the inner surface 2a of the wall 2 that is close to the overhanging portion 3a. In this case, up to where the fiber reinforced sheet 4 is attached,
It is preferable to apply the above-mentioned pretreatment also to the inner surface 2a of the wall 2.

The size, material and form of the fiber reinforced sheet 4 are as described above.

On the other hand, at the outer surface 2b of the wall 2 on the side opposite to the overhanging portion 3a of the pillar 3, that is, at the position serving as the outer surface of the pillar 3, a reinforcing metal member is arranged so as to be wrapped around the overhanging portion 3a. In this embodiment, the angle member or the flat bar 6 is used as the reinforcing metal member. As shown in FIG. 1 to FIG. 3, the outer surface 2b of the wall 2 is mounted on the outer surface 2b to form a recess 7 wider than the column width. Mortar is applied. And on this mortar, flat bar 6
Is arranged.

The flat bar 6 has a dimension longer than the column width, is provided so as to cross the projecting portion 3a, and its both ends are provided outside the column width. Further, a plurality of flat bars 6 are arranged side by side at appropriate intervals in the height direction of the pillar 3.

On the inner surface 2a of the wall 2 inwardly of both end portions of the flat bar 6, an overhanging portion 3 of the wall 2 and the pillar 3 is formed.
Both ends of the fiber reinforced sheet 4 which surrounds the projecting portion 3a are located at a pair of corner portions which are boundaries with a, and are sandwiched between the concrete skeleton portion 1 and specifically between the corner portions. A pair of pinching hardware for the above is provided. FIG.
As shown in FIGS. 2 and 4 and 5, in this embodiment, an L-shaped angle member 8 having a shape corresponding to a corner portion is used as the holding metal object.

When this angle member 8 is installed, the mortar 9 for level adjustment for setting the mounting position is applied to the inner surface 2a of the wall 2 against which one side surface 8a of the angle member 8 abuts. Further, an adhesive 5 such as an epoxy resin is provided on the surface of the fiber reinforced sheet 4 where the other side surface 8b of the angle member 8 is abutted, in order to stably and firmly adhere the two and to smooth the stress transmission. Is applied. And the fiber reinforced sheet 4
A pair of angle members 8 are attached to the corners on both sides of the overhanging portion 3a of the column 3 via the adhesive 5 and the mortar 9 laid on the wall inner surface 2a.

Further, on the wall 2, the protruding portion 3a of the pillar 3 is provided.
A pair of through holes 10 reaching from the outer surface 2b of the wall to the inner surface 2a thereof is formed on both sides of the wall. Then, these through holes 10 are provided with fasteners that are inserted into the through holes 10 and fasten the flat bar 6 inside and outside and the angle member 8 while sandwiching the wall 2.

In this embodiment, as the fasteners, the high-tensile bolts 11 inserted into the through holes 10 and the nuts 12 screwed into the high-tension bolts 11 are used. A high-tensile bolt 11 is inserted into the through hole 10 from one side through a hole (not shown) formed in each side surface 8a of the angle member 8 and a nut 12 is inserted from the opposite side.
Are screwed together so that they are fastened.

As a result, the concrete skeleton portion 1 around the pillar is completely surrounded by the fiber reinforcing sheet 4, the angle member 8, the high tensile bolts 11 and the nuts 12, and the flat bar 6.

Further, as shown in FIGS. 1 and 5, the pair of angle members 8 installed at the corners on both sides of the overhanging portion 3a of the pillar 3 have holes formed on their other side surfaces 8b. Through hole 1 formed in the projecting portion 3a through
3, the side faces 8b of the PC steel rod 14 inserted into the inside of the PC steel rod 14 and the fixing members 15 attached to both ends of the PC steel rod 14 to fix the PC steel rod 14 are fastened to each other. The fixing strength with respect to the portion 3a is increased.

Further, as shown in FIG. 1, a mortar 16 for covering and protecting the fiber reinforcing sheet 4 is provided around the overhanging portion 3a where the fiber reinforcing sheet 4 is exposed.

Further, a finishing material 17 is applied to the outer surface 2b of the wall 2 on which the flat bar 6 is arranged to cover and finish the applied portion.

As described above, in this embodiment, when reinforcing the concrete skeleton portion 1 around the pillar with the fiber reinforcing sheet 4, the overhanging portion 3a of the pillar 3 is surrounded by the fiber reinforcing sheet 4. Both ends of the fiber reinforced sheet 4 are firmly sandwiched and supported by the pair of angle members 8 with the concrete skeleton portion 1, while a flat bar is provided on the outer wall surface 2b at a position where it overlaps with the overhanging portion 3a. 6 are arranged and the flat bar 6 and the angle member 8 are fastened via the high-tensile bolts 11 penetrating the wall 2 and the like, the tensile force generated in the fiber reinforced sheet 4 by the stress generated in the concrete skeleton portion 1 It is possible to form a closed-form reinforcing structure capable of reliably transmitting the force to the flat bar 6 via the angle member 8 and the high-tensile bolts 11. KazuSatoshi the concrete skeleton part 1
Since it can be restrained with a completely closed type cross section, the structural integrity of the member for reinforcement and the concrete skeleton part 1 can be sufficiently ensured, and the shear reinforcement effect can be ensured and stronger. can do.

[0044]

As described above, according to the first aspect of the present invention, when reinforcing the concrete skeleton portion around the beam with the fiber reinforcing sheet, the overhanging portion of the beam is surrounded by the fiber reinforcing sheet, and Both ends of the fiber reinforced sheet are firmly sandwiched and supported between the concrete skeleton part by a pair of sandwiching hardware, while on the other hand, reinforcing metal fittings are provided on the floor slab surface at the position where the overhanging portion and the wrapping portion are wrapped. Since the reinforcing hardware and each of the pair of clamping hardware are fastened via the fasteners that penetrate the floor slab,
The tensile force generated in the fiber reinforced sheet due to the stress generated in the concrete skeleton part can be a closed structure of the reinforcing structure that can be reliably transmitted to the reinforced metal part via the clamps and fasteners, that is, the concrete skeleton part Since it can be restrained with a completely closed type cross section, it is possible to sufficiently guarantee the structural integrity of the member for reinforcement and the concrete skeleton part, and to make the shear reinforcement effect reliable and stronger. You can

Also in the second aspect of the present invention, the same effect as in the case of the beam can be secured by reinforcing the existing pillar structure part around the pillar with the wall, that is, the pillar integrated with the wall. .

In both the first invention and the second invention, the sandwiching metal parts are fastened to each other by the second fastener which penetrates the projecting portion of the beam or the column, whereby the fiber-reinforced sheet The fixing strength with respect to the overhanging portion can be increased.

[Brief description of drawings]

FIG. 1 is a front sectional view showing a preferred embodiment in the case of a beam according to the first invention.

FIG. 2 is a side view of FIG.

FIG. 3 is a view taken in the direction of the arrow X in FIG.

FIG. 4 is a view taken in the direction of the arrow Y in FIG.

5 is an enlarged cross-sectional view of a Z part in FIG.

FIG. 6 is a front cross-sectional view of a beam showing a conventional example.

[Explanation of symbols]

 1 Existing concrete frame part 2 Floor slab (wall) 3 Beam (column) 3a Beam (column) overhanging part 4 Fiber reinforced sheet 6 Flat bar 8 Angle material 11 High tension bolt 12 Nut 14 PC steel rod 15 Anchoring member

Claims (4)

[Claims] 1. A structure for reinforcing an existing concrete skeleton portion where a beam extends from a floor slab, and a fiber reinforced sheet which is attached around the extended portion of the beam so as to surround it, and the fiber. A pair of clamps, which are disposed at both ends of the reinforcing sheet, for clamping them between the concrete skeleton and the concrete skeleton, and the beam overhanging on the floor slab surface opposite to the overhanging part of the beam. A reinforcing structure for a beam, comprising: a reinforcing metal member that is disposed so as to be wrapped with a portion; and a fastener that is provided so as to penetrate the floor slab and that fastens the reinforcing metal member and the sandwiching metal member to each other. 2. The beam reinforcing structure according to claim 1, wherein the clamp members are fastened together by a second fastener that penetrates the projecting portion of the beam. 3. A fiber reinforced sheet having a structure for reinforcing an existing concrete skeleton part where a pillar projects from a wall, the fiber reinforced sheet being provided around the projecting part of the pillar so as to surround it, and the fiber reinforcement. A pair of clamps, which are arranged at both ends of the sheet, for clamping them between the concrete skeleton part and the projecting part of the pillar, and a wrap with the projecting part of the pillar on the wall surface opposite to the projecting part of the pillar. Reinforcement hardware arranged to be provided, and provided through the wall,
A reinforcing structure for a column, comprising: a fastener for fastening the reinforcing hardware and the sandwiching hardware. 4. The pillar reinforcing structure according to claim 3, wherein the sandwiching hardware is fastened together by a second fastener through which the projecting portion of the pillar penetrates.