JP3229249B2 - Construction method of reinforced concrete shear walls - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of constructing a reinforced concrete earthquake-resistant wall and a width-retaining bar used in the method, and more particularly, to a reinforcing steel frame at a front side and disposed opposite to the reinforcing frame. A method of constructing a reinforced concrete shear wall with densely arranged width stop bars interposed between the reinforcement frames on the rear side to prevent brittle fracture behavior of the shear wall, and used in this construction method The width of the stop.

[0002]

2. Description of the Related Art When a conventional reinforced concrete wall of this type is constructed, a conventional reinforcing steel frame is provided between a front reinforcing steel frame and an intersection of each reinforcing steel of a rear reinforcing steel frame opposed thereto. The thing which interposed the width stop is known.

[0003] The conventional width stoppers are merely used to simply maintain the distance between the front reinforcing bar and the opposing rear reinforcing bar. Therefore, 1 piece / m ² is arranged on the wall finding surface.
According to the guideline for reinforcing bars on reinforced concrete walls of the Architectural Institute of Japan, it is indicated that the reinforcing bars are arranged in a zigzag manner every 1 m vertically and horizontally. In this way, the space between the front reinforcing frame and the rear reinforcing frame facing the front reinforcing frame can be generally maintained.

[0004] However, when a horizontal load is applied during an earthquake, the reinforced concrete wall constructed by casting concrete into the reinforced frame reaches the maximum proof stress at a deformation angle of about 4/1000, and thereafter has a horizontal load. Changes to a negative gradient, and the reinforced concrete wall exhibits brittle fracture behavior.

[0005] Therefore, in order to construct a reinforced concrete shear wall having high toughness without causing brittle fracture behavior on the reinforced concrete wall even after a horizontal load due to an earthquake or the like is applied to the reinforced concrete wall and the maximum strength is reached. A technical problem to be solved arises, and an object of the present invention is to solve the problem.

[0006]

SUMMARY OF THE INVENTION The present invention has been proposed in order to achieve the above-mentioned object, and includes a left and right pillar and
A reinforced concrete wall surrounded by a lower beam
Te, said reinforced concrete Zokabe has a lattice form an assembled front portion of the reinforcing bar frame, this in opposite and a reinforcement frame side after being assembled in a lattice pattern, this such opposed on both sides after interposed width stopper muscle between intersections of the reinforcing bar which is assembled in a lattice pattern, concrete Te at the the construction method of the reinforced concrete wall is brought constructed Da設, the width stop muscle, muscle material
And a ring body fixed to both ends of the pair, and the ring body is
Locked on the outer surface of each reinforcing bar arranged facing
It is, and, at regular intervals in a substantially 100mm~300mm pitch
After being arranged at, it was built by casting concrete
A method of constructing a reinforced concrete shear wall which is formed so as to prevent the brittle fracture behavior of the shear wall, and a method of constructing the reinforcing bar of the front side and the reinforcing bar of the rear side opposite to the front side. The width-retaining bars interposed between the intersections provide a method of constructing a reinforced concrete earthquake-resistant wall that is disposed in a wide area of a substantially X shape in a front view of the front and rear reinforcing bars.

[0007]

FIG. 1 is a block diagram showing an embodiment of the present invention.
A description will be given with reference to FIG. FIG. 1 shows an embodiment of the first aspect of the present invention, and is a partially cutaway bevel view. In FIG. 1, reference numeral 1 denotes a reinforcing steel frame used for constructing a reinforced concrete earthquake-resistant wall. The reinforcing steel frame 1 is a front reinforcing steel frame 1a and a rear reinforcing steel frame 1a is disposed opposite to the front reinforcing steel frame 1a. .. Consist of a side reinforcing bar frame 1b and width stop bars 2, 2.
Thus, the front side reinforcing bar frame 1a and the rear side reinforcing bar frame 1b are assembled with the vertical bars and the horizontal bars in the form of a lattice, and the respective crossing portions are joined together, and each crossing of the front and rear reinforcing bar frames 1a, 1b. The units are arranged so as to face each other.

FIG. 2 is a perspective view showing the width stop 2. In the width stopping bar 2, metal rings 2b, 2b are fixed to both ends of an iron bar-shaped reinforcing bar 2a. Further, the length of the reinforcing member 2a is such that when the width stoppers 2, 2,... Are interposed between the facing intersections of the front side reinforcing frame 1a and the rear side reinforcing frame 1b, Are formed to have a length L that can be engaged with the outer surface of the reinforcing bar located outside the intersection.
In addition, the diameter of the ring bodies 2b, 2b is equal to the diameter of the reinforcing member 2a.
It is preferably at least two times.

When the width stop bars 2, 2... Are arranged at the opposed intersections of the front side reinforcing bar frame 1a and the rear side reinforcing bar frame 1b opposed thereto, respectively, It is assumed that the parts are arranged with an interval of 100 mm to 300 mm in the vertical and horizontal directions. As described above, concrete is poured into the reinforcing bar 1 constructed by disposing the width stop bars 2, 2... Between the front reinforcing frame 1a and the rear reinforcing frame 1b to construct a reinforced concrete shear wall. Then, when the deformation angle of the reinforced concrete shear wall reaches the maximum strength of about 4/1000 during an earthquake, the horizontal deformation relationship of the horizontal load thereafter does not turn into a negative gradient, and the toughness remains after the maximum strength. Will be performed. However, when the distance between the width stop bars 2, 2,... Is 100 mm or less, when the concrete is poured into the reinforcing bar frame 1, the concrete may not be sufficiently filled. If this is the case, the great toughness of the reinforced concrete shear wall cannot be expected. Therefore, the distance between the width stoppers 2, 2,.
0 mm to 300 mm is most effective.

Further, as described above, the width stop 2 is formed by fixing the loops 2b, 2b to both ends of the reinforcing member 2a, and the rings 2b, 2b of the width stop 2 are used. Are fixed to the outer side surfaces of the reinforcing bars of the front side reinforcing frame 1a and the rear side reinforcing frame 1b, respectively, when the deformation angle of the reinforced concrete shear wall reaches the maximum strength of about 4/1000 during an earthquake. In this case, the fog side of the concrete cast outside from the reinforcing bar frame 1 may collapse due to the horizontal load of the earthquake, but the reinforcing bar frame 1
b and 2b prevent outward expansion, so that the reinforced concrete shear wall except for the fogged portion of the concrete, the concrete inside the reinforced frame 1 is protected by the reinforced frame 1 and the fog of the concrete is prevented. The phenomenon of collapse following the collapse of the part disappears, and a reinforced concrete shear wall with high toughness can be obtained.

FIG. 3 is a partially cutaway front view showing an embodiment of the present invention. In the figure, 3 is a pillar and 4 is a beam. The reinforced concrete earthquake-resistant wall surrounded by the left and right pillars 3 and 3 and the upper and lower beams 4 and 4 is formed by assembling the front reinforcing frame 1a and the rear reinforcing frame 1b and the width stop bars 2 and 2 as described above. It can be constructed by casting concrete into the reinforced frame 1 thus constructed. Thus, in FIG. 3, the front side reinforcing bar frame 1a and the rear side reinforcing bar frame 1b are not constituted by the vertical bars and the horizontal bars, but with respect to the columns 3, 3 and the beams 4, 4. When the reinforcing bars are arranged in a slanting manner, and the above-mentioned width stop bars 2, 2... Are respectively arranged between the crossing portions of the front and rear reinforcing bar frames 1a, 1b facing each other, the left, right, up and down in an oblique direction Are arranged at a distance of 100 mm to 300 mm as described above. By arranging the width stoppers 2, 2,... As described above, it is obvious that the same operation and effect as the reinforced concrete shear wall of the embodiment described in FIG. 1 can be expected. Since the reinforcing bars of the front side reinforcing bar frame 1a and the rear side reinforcing bar frame 1b are arranged diagonally, when a horizontal force acts on the reinforced concrete shear wall during an earthquake,
The shear breaking force is such that an oblique concrete brace is formed on the compression side of the reinforced concrete shear wall, and a tensile place is formed directly on the tension side by the reinforcing bars arranged obliquely on the tension side. The proof stress is further improved. Further, even in the case where the reinforcing bars are arranged diagonally, the reinforcing bars 1 can be pre-assembled by closely arranging the width-retaining bars 2, 2. The effort is also significantly reduced.

[0012] Figure 4 shows an embodiment of the second aspect of the present invention. In the figure, the width stop bars 2, 2... Disposed between the front side reinforcing bar frame 1a and the rear side reinforcing bar frame 1b are reinforcing bars between the left and right columns 3, 3 and the upper and lower beams 4, 4. The frame 1 is disposed in a wide area having a substantially X shape when viewed from the front. Of course, the width stoppers 2, 2,...
mm to 300 mm. Thus, when the horizontal force of the earthquake is applied to the reinforced concrete shear wall to be constructed, as described above at the time of the maximum strength, the diagonal concrete brace formed on the reinforced concrete shear wall has the width stop bars 2, 2,. Are densely arranged, the compressive stress concentrated on the diagonal concrete brace portion becomes large, and the seismic resistance of the reinforced concrete shear wall is the same as the case where the width stop is arranged on the whole.

The present invention can be variously modified without departing from the spirit of the present invention, and it goes without saying that the present invention extends to the modified ones.

[0014]

According to the present invention, as described in detail in the above embodiment , both ends of a reinforcing member are provided between a front reinforcing frame and a rear reinforcing frame surrounded by left and right columns and upper and lower beams. Fix the ring
The ring body is attached to the front side reinforcing bar frame and the rear side.
Substantially 100mm The width stopper muscle is engaged with the outer surface of the section reinforcing bar frame
Due to the equally spaced apart in ~300mm pitch, reinforced concrete shear walls concrete reinforcing steel frame is constructed is pouring is loaded horizontal load during an earthquake, the drift angle
Reached a maximum yield strength of about 4/1000,
Concrete fog cast outward from the reinforced frame
The side may collapse due to the horizontal load of the earthquake
Also, the reinforcing bar frame is expanded outward by the ring of the width stopping bar.
And therefore the reinforced concrete shear wall is
Except for the concrete fog,
Concrete is protected by the rebar frame and concrete
The phenomenon of falling down following the fall of the fog section
It becomes. In addition, in detail, the reinforced concrete shear wall
Even after the horizontal load at the time of the earthquake is applied and the deformation angle reaches the maximum strength, the reinforced concrete shear wall behaves with great toughness, and the seismic resistance is extremely improved. As described above, the reinforced concrete shear wall does not cause the redistribution of stress to the independent columns forming the frame of the building because the horizontal deformation relationship of the horizontal load is not likely to have a negative gradient even after the maximum strength. The reinforced concrete shear walls will bear most of the seismic force than the columns. Thus, it is also possible to reduce the cross-sectional area of the pillar and the amount of main muscle.

[0015] Further, a front reinforcing bar and a rear reinforcing bar are provided.
The width stop is surrounded by left and right columns and upper and lower beams.
When viewed from the front of the reinforced steel frame to be surrounded, it is within a wide area of approximately X shape.
And, as mentioned above, the mutual
The intervals are approximately 100mm to 300mm and are arranged at equal intervals
Because of the earthquake horizontal
When the load is applied, the concrete
The width stop is densely arranged on the brace formed on the shear wall.
Is installed on the diagonal concrete brace
The concentrated compressive stress increases, and the reinforced concrete
The earthquake resistance of the diaphragm wall is almost the same as when the width stop is arranged on the whole
become. Also, the pitch between the width stop bars should be 100 mm or less.
If it is set below, concrete will be poured into the rebar frame
Although not performed sufficiently, the present invention is set to 100 mm or more
Therefore, concrete filling is sufficiently performed. Also, 300mm
With the above settings, the large toughness of the reinforced concrete
Can not be expected, but the present invention is 300mm or less
Large toughness of reinforced concrete shear walls
It is an invention which has a truly significant effect, such as the expectation of .

[0016]

[Brief description of the drawings]

FIG. 1 shows an embodiment of the present invention, and is a partially cutaway slope view thereof.

FIG. 2 is a perspective view of a width stop used in the present invention.

FIG. 3 is a partially cutaway front view showing another embodiment of the present invention.

FIG. 4 is a partially cutaway front view showing still another embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Reinforcement frame 1a Front side reinforcement frame 1b Rear side reinforcement frame 2 Width stop 2a Reinforcement 2b Cycle

──────────────────────────────────────────────────続 き Continued on the front page (58) Fields surveyed (Int. Cl. ⁷ , DB name) E04B 2/84 E04C 5/00-5/20 E04B 2/56-2/70 E04H 9/02 321

Claims (2)

(57) [Claims] 1. Surrounded by left and right columns and upper and lower beams.
The reinforced concrete wall,
Zokabe has a lattice form an assembled front portion of the reinforcing bar frame, this in a reinforcing bar frame side after being assembled in a grid facing
Has, after interposing width stopper muscle between intersections of the reinforcing bar which is assembled in a lattice shape on both sides of this or the like opposing At a construction method of the reinforced concrete wall is brought constructed Da設concrete The above-mentioned width stop is fixed to the loop at both ends of the reinforcement.
And the ring body is an iron
Each bar is locked to the outer surface of the rebar and is approximately 100 m
After being arranged at equal intervals at a pitch of m to 300 mm , brittle fracture of a shear wall constructed by casting concrete
A method for constructing a reinforced concrete shear wall which is formed so as to prevent movement . 2. A width stop interposed between intersections of respective reinforcing bars of the front reinforcing frame and the rear reinforcing frame facing the rear reinforcing frame.
The reinforcing bar has a width of substantially X shape in a front view of the front and rear reinforcing bar frames.
2. The device according to claim 1, wherein the device is disposed in a wide area.
The construction method of the reinforced concrete shear wall described in the above.