JP2001020449A - Opening reinforcing construction for reinforced concrete beam member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To effectively utilize occupancy rooms by making a hole matching to an opening inside a reinforced concrete beam member having an opening and embedding a reinforcing concrete plate having a higher strength than concrete's for reinforced concrete beam member. SOLUTION: A circular opening 11 for inserting an air-conditioning duct or the like is formed to penetrate through a beam member 10 at the beam end portion of a reinforced concrete beam member 10. Then, a square reinforcing concrete plate 12 is embedded at a portion where the opening is provided. And V-shaped reinforcing bars 13a, 13b are provide at the top and bottom, and a hole 20 matching the opening 11 is formed at a center part of the reinforcing concrete plate 12. Next, the concrete strength of the reinforcing concrete plate 12 is set larger than the strength of the concrete 14 of the beam member 10, that is, higher than 1000 kg/cm2 and one plate is used at each side of the beam member 10. Thus, within the occupancy room, the area of a dropped ceiling for a duct can be reduced, and the effective space for the occupancy room can be expanded.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an opening reinforcing structure for a reinforced concrete beam member.

[0002]

2. Description of the Related Art Generally, in a house or the like, as shown in FIG. 6, an opening 2 is sometimes penetrated to pass an air conditioning equipment duct or the like through a reinforced concrete beam member 1. Such an air-conditioning equipment duct or the like usually passes through a corner of the room in order to use the living room effectively.

As described above, if the opening 2 penetrates the beam member 1, the beam strength near the opening 2 is reduced.
The reinforcement was provided by arranging reinforcing bars 3 around the opening 2. In addition, the code | symbol 4 in FIG. 6 is a column, 5 is a main beam, and 6 is a stirrup.

[0004]

However, in the conventional reinforcing structure for an opening of a reinforced concrete beam member, the reinforcing bar 3 is arranged around the opening 2 as described above.
Since the reinforcing bars 3 exhibit the effect of reinforcement only after cracks have occurred in the concrete around the opening 2, they have a high effect on reinforcing the ultimate strength, but have a low effect on preventing the occurrence of cracks. there were.

Further, the reinforcing bars 3 exhibit a reinforcing effect in cooperation with the concrete, and as described below, only the reinforcing bars 3 are provided at a portion such as a beam end where the concrete is destroyed by bending yield. Since the opening 2 was to be reinforced, and a sufficient reinforcing effect could not be obtained,
The opening 2 could not be provided at the beam end.

That is, in general, in a reinforced concrete beam, after the beam bends and yields at the end, the concrete gradually breaks down from the outer periphery of the beam due to the compressive force due to bending stress as the deformation of the beam end progresses. The effective cross-sectional area decreases. When the effective area of concrete reaches a certain limit, shear failure occurs. In particular, if there is an opening at the beam end that is the bending yield zone, the effective area decreases sharply due to the destruction of the concrete at the outer periphery and the shear fracture occurs, so an opening can be provided in the bending yield zone. Did not.

[0007] As described above, if an opening cannot be provided at the end of the beam, there is a problem that the falling ceiling for passing the duct is increased in the living room, and the quality of the living room is reduced. Here, if the decrease in the effective cross-sectional area after the bending yield of concrete can be suppressed, the deformation performance of the beam can be ensured, and an opening can be provided at the beam end.

SUMMARY OF THE INVENTION An object of the present invention is to solve such a problem, and it is possible to suppress a decrease in an effective sectional area after bending yielding of concrete, whereby an opening is formed at a beam end. It is an object of the present invention to provide an opening reinforcing structure for a reinforced concrete beam member that can be provided and enables a living room to be used effectively.

[0009]

SUMMARY OF THE INVENTION The present invention relates to an opening reinforcing structure for a reinforced concrete beam member, and is constituted as follows in order to solve the above-mentioned technical problems. That is, the opening reinforcing structure for a reinforced concrete beam member according to the present invention has a hole matching the opening inside a reinforced concrete beam member having an opening, and a reinforcing member having a higher strength than concrete of the reinforced concrete beam member. It is characterized by embedding concrete boards.

The present invention also provides that the reinforcing concrete plate has a strength of 1000 kg / cm ² or more, the reinforcing concrete plate is provided with a reinforcing bar, and the reinforcing concrete plate is The stress was introduced, and the concrete plate for reinforcement had a thickness of 10 to 10.
50 mm, the opening is circular, and the reinforcing concrete plate is square having a side of about twice the diameter of the opening, or a circle having a diameter of about twice the diameter of the opening, Means for improving the adhesion of the reinforced concrete beam member to concrete are provided on the surface of the concrete plate for use, and the reinforcing concrete plate is used in accordance with the use conditions of the reinforced concrete beam member. The number of sheets is set, the reinforcing concrete plate is provided with attachment means for the reinforced concrete beam member, the reinforcing concrete plate is mixed with a fiber material, the reinforcing concrete plate Characterized in that reinforcing bars are provided on the fins.

(Function) According to the reinforcing structure for an opening of a reinforced concrete beam member according to the present invention, the reinforcing concrete plate buried at the end of the beam has higher strength than ordinary concrete, so that the shear strength is increased. , Very high rigidity,
For this reason, after the bending yield of the beam member, the decrease in the effective sectional area due to the gradual destruction of the concrete of the beam member from the outer peripheral portion can be compensated for by the strength and rigidity of the reinforcing concrete plate.

When the reinforcing steel plate is provided with the reinforcing steel, the reinforcing effect is enhanced because the reinforcing steel is in the high-strength concrete. In addition, since the concrete plate for reinforcement has high strength, it has a very high rigidity and begins to exhibit the reinforcing effect simultaneously with the concrete of the beam member. And the occurrence of cracks can be reduced.

When a prestress is introduced into the reinforcing concrete plate, the reinforcing effect can be further enhanced.

[0014]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a reinforced concrete beam member according to an embodiment of the present invention;

FIG. 1 is a view showing a beam member 10 to which an opening reinforcing structure for a reinforced concrete beam member according to the present invention is applied. At the beam end of the reinforced concrete beam member 10, a circular opening 11 for passing an air conditioning duct or the like is provided.
It is provided so as to penetrate the beam member 10. A quadrangular reinforcing concrete plate 12 is buried in the portion where the opening 11 is provided, and an octagonal reinforcing bar 13 is vertically arranged.
a and 13b are provided.

The reinforcing concrete plate 12 has an appropriate thickness t as shown in FIG. 2, and has a hole 20 at the center thereof which is aligned with the opening 11. The concrete strength of the reinforcing concrete plate 12 is set to be larger than the strength of the concrete 14 of the beam member 10 and is 1000 kg.
/ Cm ² or more. Also, in this case,
The thickness t is preferably about 10 to 50 mm. Here, two reinforcing concrete plates 12 are used, one on each side of the beam member 10.

As shown in FIG. 3, the size of the reinforcing concrete plate 12 is such that the length L of one side thereof is the diameter D of the opening 11.
It is about twice that of FIG. Inside the reinforcing concrete plate 12, for example, a mesh-like reinforcing bar 21 is provided.

Further, irregularities (not shown) are provided on the surface of the reinforcing concrete plate 12 as an attaching means in order to improve the adhesion of the beam member 10 to the concrete 14. As this attaching means, roughening or the like can be provided.

The octagonal reinforcing bars 13a and 13b are shown in FIG.
As shown in the figure, the upper and lower sides are formed in a U-shape, and in the present embodiment, two are provided on the upper and lower sides, respectively. The octagonal reinforcing bars 13a and 13b restrain the upper and lower beam main bars 15 two by two, so that even if a compressive force due to bending acts on the beam main bars 15, it does not buckle.

In FIG. 1, reference numeral 14 denotes concrete having a square cross section, 15 denotes a main beam reinforcement, 16 denotes a stirrup, 1
Reference numeral 7 denotes a column to which the beam member 10 is joined, reference numeral 18 denotes a column main bar, and reference numeral 19 denotes a hoop bar. These members are the same as those of a normal beam member and a column member, and a detailed description thereof will be omitted.

Next, the operation of the beam member 10 will be described.
The reinforcing concrete plate 12 buried at the end of the beam has a concrete strength of about 1000 kg / cm ² or more, which is much higher than that of ordinary concrete. Has become.

For this reason, after the bending yield of the beam member 10, the decrease in the effective cross-sectional area due to the gradual destruction of the concrete 14 of the beam member 10 from the outer peripheral portion is compensated for by the strength and rigidity of the reinforcing concrete plate 12. be able to. Further, since the reinforcing bars 21 incorporated in the reinforcing concrete plate 12 are also in the high-strength concrete, the reinforcing effect is enhanced.

Further, the surface of the reinforcing concrete plate 12 is provided with unevenness or roughening as an attachment means by surface treatment.
4, and the reinforcing concrete plate 12 can effectively reinforce the surrounding concrete 14.

Since the reinforcing concrete plate 12 is made of ultra-high-strength concrete, it does not require fogging on the opening 11 side, has very high rigidity, and exhibits a reinforcing effect simultaneously with the concrete 14 of the beam member 10. Therefore, it is possible to increase the crack generation strength, which was impossible with the conventional reinforcement using only the reinforcing bar, and thereby reduce the occurrence of cracks. Further, when the reinforcing concrete plate 12 is pre-stressed in advance, the reinforcing effect can be further enhanced.

As described above, in the structure for reinforcing an opening of a reinforced concrete beam member according to the present invention, a high-strength reinforcing concrete plate 1 is provided at a portion where an opening 11 of a beam member 10 is provided.
Since the burial 2 is buried, it is possible to install the opening 11 at the beam end, which was impossible with the conventional reinforcement using only the reinforcing steel, and thereby the area of the duct ceiling can be reduced in the living room of the house. Therefore, the quality of the living room is improved, and the living room can be used effectively.

Further, since the strength of crack generation around the opening of the beam or wall, which cannot be achieved by the conventional reinforcement using only the reinforcing bar, can be increased, the occurrence of cracks can be reduced. Furthermore, a concrete plate for reinforcement can be applied to the end of a beam having no opening. In this case, the deformation performance after bending and yielding of the beam can be greatly improved. It is particularly effective for such applications.

Since the reinforcing concrete plate 12 is made of ultra-high-strength concrete, it can be made relatively small and lightweight. Also, the optimal size and number of sheets can be selected according to the enforcement conditions and use conditions.
Good workability.

In the above embodiment, the case where two reinforcing concrete plates 12 are used has been described. However, an appropriate number of reinforcing concrete plates 12 may be used in accordance with use conditions such as a load applied to the beam member 10. Can be. In addition, as a mounting means for easily attaching the reinforcing concrete plate 12 to the beam member 10, the reinforcing concrete plate 1
A hook or hook-shaped rebar (not shown) or the like can be provided on the 2 or a hole can be made. Furthermore, various fiber materials can be mixed into the reinforcing concrete plate 12 for reinforcement.

Further, in the above-described embodiment, the reinforcing concrete plate 12 has a square shape and the mesh-like reinforcing reinforcing bar 21 is provided therein. However, as shown in FIG. 30, and a PC steel rod 31 can be provided in a lattice shape therein. Also, FIG.
As shown in the figure, a circular reinforcing concrete plate 32,
The reinforcing reinforcing bar 33 may be circular. The reinforcing concrete plate and the reinforcing reinforcing bar inside the reinforcing concrete plate are not limited to a circular shape or a square shape, and can be formed in various shapes.

In the above-described embodiment, the reinforcing concrete plate 12 is provided at the end of the beam member 10, but the reinforcing concrete plate is used to reinforce the opening at the center of the beam and the opening at the wall in addition to the beam end. Can also be used.

Even when there is no opening at the beam end, the deformation performance of the beam member can be greatly improved by embedding a reinforcing concrete plate at the beam end, and a short deformation which requires a large deformation performance is required. It is very effective for span beams. In this case, the holes in the reinforcing concrete plate are unnecessary.

[0032]

As described above, according to the present invention,
A high-strength reinforcing concrete plate is buried in the portion where the beam member has an opening, so it is possible to install an opening at the end of the beam, which was not possible with conventional reinforcing bars only. Since the area of the ceiling for ducts can be reduced in the living room of the house, the effective space of the living room can be widened,
Quality is improved.

Further, since the strength of crack generation around the opening of the beam or wall, which cannot be achieved by the conventional reinforcement using only the reinforcing bar, can be increased, the occurrence of cracks can be reduced.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional view illustrating an opening reinforcing structure of a reinforced concrete beam member according to the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a view showing a reinforcing concrete plate of an opening reinforcing structure for a reinforced concrete beam member according to the present invention.

FIG. 4 is a view showing an octagonal reinforcing bar of the opening reinforcing structure for a reinforced concrete beam member according to the present invention.

FIG. 5 is a view showing another embodiment of a reinforcing concrete plate of the opening reinforcing structure for a reinforced concrete beam member according to the present invention.

FIG. 6 is a partial cross-sectional view showing an opening reinforcement structure of a reinforced concrete beam member according to a conventional example.

[Explanation of symbols]

 Reference Signs List 10 beam member 11 opening 12, 30, 32 concrete plate for reinforcement 14 concrete of beam member 20 hole 21, 31, 33 reinforcing steel

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 2E163 FA12 FB04 FB07 FB09 FB23 FB31 FB34 FB42 FB43 FB49 FD03 FD13 FD21 FD32 FD33 FD39 FD39 FD44 FD46 FD48 FD49 FF13 FG01 2E164 AA02 CA31 CA12 CA33

Claims (10)

[Claims] 1. A reinforced concrete beam member having an opening and having a hole aligned with the opening and a reinforcing concrete plate higher in strength than concrete of the reinforced concrete beam member embedded therein. Opening reinforcement structure for beam-forming members. 2. The reinforcing concrete plate has a strength of 10
2. The pressure is at least 00 kg / cm ^2.
4. An opening reinforcement structure for a reinforced concrete beam member according to item 1. 3. The reinforcing concrete plate is provided with a reinforcing steel bar.
4. An opening reinforcement structure for a reinforced concrete beam member according to item 1. 4. The reinforcing structure for an opening of a reinforced concrete beam member according to claim 3, wherein a prestress is introduced into the reinforcing concrete plate. 5. The reinforcing concrete plate has a plate thickness of 1
The opening reinforcement structure for a reinforced concrete beam member according to any one of claims 1 to 4, wherein the opening is from 0 to 50 mm. 6. The opening has a circular shape, and the reinforcing concrete plate has a square whose one side is about twice the diameter of the opening.
The reinforcing structure for an opening of a reinforced concrete beam member according to any one of claims 1 to 5, wherein the diameter of the opening is a circle of about twice the diameter of the opening. 7. The surface of the reinforcing concrete plate,
The reinforcing structure for an opening of a reinforced concrete beam member according to any one of claims 1 to 6, further comprising an attachment means for improving the adhesion of the reinforced concrete beam member to concrete. 8. The reinforced concrete beam member according to claim 1, wherein the number of the reinforcing concrete plates used is set in accordance with a use condition of the reinforced concrete beam member. Opening reinforcement structure. 9. The reinforcing structure for an opening of a reinforced concrete beam member according to claim 1, wherein said reinforcing concrete plate is provided with means for attaching to said reinforced concrete beam member. 10. The reinforcing concrete board contains a fiber material mixed therein.
An opening reinforcement structure for a reinforced concrete beam member according to any one of the above.