JP4003911B2 - Reinforced reinforced concrete reinforced wall and method for forming reinforced wall - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to increasing beating reinforced concrete reinforced walls and reinforcing wall forming method comprising reinforces the existing wall and out increasing wall made of reinforced concrete on the outer side of the existing wall.
[0002]
[Prior art]
Conventionally, when performing seismic reinforcement work on a building wall, first, the approximately 20 mm thick finish mortar 12 formed on the outer surface side of the concrete wall body 11 of the existing wall 10 shown in FIG. 5A is removed. Then, the concrete surface of the wall body 11 is exposed to roughen the concrete surface. After that, as shown in FIG. 5 (b), anchor bolts K are driven into the left and right columns 30, 30 and the upper and lower beams 40, 40 of the existing wall 10 so as to extend vertically to the outside of the concrete wall body 11. The reinforcing bars 51a, the horizontal bars 51b, and the width stopping bars 51c are arranged, the formwork is installed, and the concrete is placed, and as shown in FIG. The reinforced concrete wall main body 51 made of reinforced concrete is constructed. Finally, a finishing material 52 is formed on the outer side of the above-mentioned reinforced concrete wall body 51 to construct the reinforced concrete reinforcing wall 50.
In the conventional reinforcing wall, the finishing mortar 12 of the existing wall 10 is removed when the finishing mortar 12 exists between the concrete wall main body 11 of the existing wall 10 and the newly constructed reinforced concrete wall main body 51. This is because when the stress such as a buckling load acts on the concrete wall main body 11 and the increased reinforced concrete wall main body 51, the wall strength may be lowered.
[0003]
[Problems to be solved by the invention]
By the way, according to the conventional method, not only the removal work of the finishing mortar 12 takes time, but also the earthquake-proof reinforcement work is usually performed in a state where the building is used. The noise and vibration generated during the removal work were regarded as problems. Therefore, if the additional reinforced concrete reinforcing wall 50 is constructed without peeling off the finishing mortar 12 from the concrete wall body 11, the above noise and vibration can be suppressed, and the construction cost and work time for the removal work can be reduced. It can be greatly improved.
[0004]
The present invention has been made in view of the problems in the prior art as described above, to build a high increase beating Concrete reinforcing walls shockproof early and at low cost, and an object.
[0005]
[Means for Solving the Problems]
The present invention has been made in view of the problems in the prior art as described above, and has succeeded in constructing an reinforced concrete reinforcing wall with high earthquake resistance at an early stage and at a low cost. It is like this.
[0006]
(1) Reinforced wall construction parts including reinforcing bars composed of vertical and horizontal bars are provided on both outer surfaces of an existing wall consisting of a concrete wall main body and a finished mortar formed on the outer surface side of the wall main body. And a buckling stopper made of a reinforcing bar penetrating the existing wall at the center of the existing wall, and fixing both ends of the buckling stopper to the reinforcing bar of the reinforcing wall construction part, and the buckling A reinforced concrete reinforcing wall for reinforcing reinforced concrete, characterized in that the center portion of the stopper is fixed in the through hole of the concrete wall main body of the existing wall.
[0007]
(2) The reinforced concrete reinforcing wall according to (1) above, wherein the buckling stop is provided in an oblique concrete brace region formed by a shear resistance of the wall.
[0008]
(3) Reinforced concrete reinforced concrete wall characterized in that the buckling stop is provided at a plurality of positions symmetrical to the center of the wall or the center of the wall.
[0009]
(4) a buckling prevention arrangement step of arranging a buckling prevention through the existing wall in the center of the existing wall composed of a concrete wall main body and a finished mortar formed on the outer surface side of the wall main body, A buckling stopper both ends fixing step of reinforcing reinforcing bars for both sides of the existing wall, and fixing both ends of the buckling stoppers to the reinforcing bars, respectively. A step of constructing an additional reinforced concrete wall body by placing concrete on the outside of the reinforcing bar and then constructing an additional reinforced concrete wall main body, and then forming a finish on the outer side of the reinforced concrete wall main body, and the buckling In the stop disposing step, the step of providing the buckling stop at a plurality of positions symmetrical with respect to the center of the wall, and the step of fixing the central portion of the buckling stop in the concrete wall main body. , Reinforcing wall forming method comprising a.
[0010]
That is, the reinforced concrete reinforcing wall according to claim 1 of the present invention is composed of vertical and horizontal bars on both outer surfaces of an existing wall composed of a concrete wall main body and a finished mortar formed on the outer surface side of the wall main body. A reinforcing wall constructing section including a reinforcing bar is provided, and the reinforcing wall constructing section and the central portion of the existing wall are provided with buckling stoppers made of reinforcing bars penetrating the existing wall, and both ends of the buckling stopper are reinforced. A reinforcing wall made of reinforced concrete is provided outside the finished mortar by fixing and fixing the central portion of the buckling stopper in the through hole of the concrete wall body of the existing wall. It is characterized by constructing.
[0011]
The reinforced concrete reinforcing wall according to claim 2 is characterized in that the buckling stop is provided in an oblique concrete brace region formed by a shear resistance of the wall.
[0012]
The reinforced concrete reinforcing wall according to claim 3 is characterized in that the buckling stopper is provided at a plurality of positions symmetrical with respect to the center of the existing wall .
[0013]
5. The reinforcing wall forming method according to claim 4, wherein a buckling stopper is provided through the existing wall at the center of the existing wall comprising a concrete wall main body and a finished mortar formed on the outer surface side of the wall main body. The buckling prevention both ends fixed and the both ends of the buckling stopper are fixed to the reinforcing steel reinforcing bars and the reinforcing concrete reinforcing bars are arranged on both outer surfaces of the existing wall. And an additional reinforced concrete wall in which a formwork is placed outside the reinforcing steel for the reinforced concrete and then the concrete is cast to construct a reinforced concrete wall main body and then a finish is formed on the outer side of the reinforced concrete wall main body. Forming the buckling prevention step, the step of providing the buckling prevention at a plurality of positions symmetrical to the center of the wall and the central portion of the buckling prevention. It is characterized in that a step of fixing Ried wall body.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 (a) and 1 (b) are diagrams showing a construction method of a reinforced concrete reinforcement wall according to the present embodiment, FIG. 1 (a) is a front view, and FIG. 1 (b) is a diagram of FIG. 1 (a) . It is AA sectional drawing.
In Figure 1, reference numeral 10 existing wall comprising a finishing mortar 12. concrete wall body 11, reference numeral 20 is increased beating reinforced concrete formed by forming a reinforced concrete wall body 21 and finish 22 out increased on the outside of the existing wall 10 Reinforcement wall (hereinafter abbreviated as reinforcement wall), reference numeral 30 is a pillar of a building, reference numeral 40 is a beam, reference numeral 1 is a buckling stopper (sharky) composed of a reinforcing bar connecting the existing wall 10 and the reinforced concrete wall body 21. ).
Reference numerals 21 a and 21 b are vertical and horizontal bars of the increased reinforced concrete wall body 21, respectively, and reference numeral 21 c is a width stop bar of the increased reinforced concrete wall body 21.
[0015]
As shown in FIGS. 2 (a) and 2 (b) together with FIG. 1 (b), the shear key 1 is a wall shear resistance which is a region where a compressive force acts when an axial force P acts on the upper surface side of the wall. central portion of the diagonal concrete braces region (FIG hatched portion) which is formed by, i.e. from a central portion of the concrete wall body 11 of the existing wall 10, the upper Symbol finishing mortar 12 perpendicular to the thickness direction of the concrete wall body 11 When reinforcing the existing wall 10 from both sides with reinforcing bars protruding outside, as shown in FIG. 3A, the existing wall 10 penetrates through the concrete wall body 11 and the finishing mortar 12. the hole 2 is provided, in the through hole 2, for example, a fixed member 3 such as epoxy resin together when fixing the central portion of the Sharkey 1, as also shown in FIG. 3 (b), both end portions of the Sharkey 1 , Extra hammered iron Each fixed with wire or the like at the intersection of the vertical line 21a and horizontal stripes 21b which is Haisuji in constructing concrete wall body 21. In this embodiment, three Sharkeys 1 are installed at the intersection of the vertical bars 21a and the horizontal bars 21b in the vicinity of the center O of the wall. However, in FIGS. In order to clarify the operation, only one of the Sharkeys 1 is shown.
[0016]
Construction method of this embodiment of the definitive to form increased beating Concrete reinforcing walls, without removing the finishing mortar 12 of the existing wall 10, in the central portion of the existing wall 10, as shown in FIG. 3 (a), its central portion While installing the Sharkey 1 which is embed | buried in the said concrete wall main body 11 of the existing wall 10 shown in FIG.1 (b), and the both ends protrude in the reinforcement wall construction part of the outer side of the said finishing mortar 12, respectively, the said existing wall Anchor bolts K are driven into the left and right pillars 30 and 30 and the upper and lower beams 40 and 40 as shown in FIG. 1A, and the outside of the existing wall 10 (the outside of the finished mortar 12). The vertical bars 21a, the horizontal bars 21b and the width stopper bars 21c for constructing the reinforced concrete wall body 21 are arranged.
At this time, each end of the shear key 1 is fixed to the intersection of the vertical bars 21a and the horizontal bars 21b with a wire. After that, a formwork is installed and concrete is placed, and an additional reinforced concrete wall body 21 made of reinforced concrete is constructed as shown in FIG. 1, and a finishing material 22 is formed on the outside of the additional reinforced concrete wall body 21. Then, the reinforced concrete reinforcing wall 20 is constructed.
Therefore, since the concrete wall main body 11 of the existing wall 10 and the reinforced concrete wall main body 21 are connected by the Sharkey 1, the concrete wall main body 11 and the additional reinforced concrete wall main body 21 are connected to the concrete wall main body 11 and the additional reinforced mortar 12. Since it behaves integrally with the reinforced concrete wall main body 21, the seismic resistance of the reinforced concrete reinforcing wall 20 can be improved.
[0017]
Next, the seismic effect of the reinforced concrete reinforcing wall by installing the shear key 1 will be described.
As shown in FIG. 2A, when an axial force P is applied to the upper surface side of the wall, the buckling load Pcr applied to the diagonal concrete brace of the wall causes the length of the pin on both ends of the diagonal concrete brace of the wall to be Lo ( Diagonal length) The thickness is calculated as follows by Euler buckling, assuming that the thickness of the bar is t and the width of the diagonal concrete brace of the wall is Be.
Pcr = π2 E / I / Lo 2
Where Pcr: buckling load
E: Young's modulus
I: Sectional moment of inertia (Be · t 3/12)
The brace width Be is a constant determined by the size and thickness of the wall, the amount of reinforcement, the axial force applied to the incidental column, the structure of the incidental column, and the like.
[0018]
The horizontal component PcrH of the buckling load Pcr, that is, the shearing force acting on the wall can be expressed by PcrH = Pcr · sin θ, where θ is the angle formed between the vertical direction of the wall and the diagonal direction. This PcrH must be larger than the shear strength Qcal required for the reinforced wall.
Therefore , when PcrH becomes smaller than Qcal, buckling prevention (sharky) is required.
[0019]
As shown in FIG. 2 (b), the strength of the shear key 1 is such that when an out-of-plane force F acts on the reinforcing wall 20, the concrete wall body 11 of the existing wall 10 and the increased reinforced concrete wall body 21 behave together. The proof stress is required. For this purpose, the strength (tensile strength) of the shear key 1 may be made larger than the maximum value of the out-of-plane force F (out-of-plane force for design). The value of the design surfaces external force q, depending on the wall of earthquake resistance requirements, for example, the value of the larger of the 2% of the maximum strength of 5% or wall buckling load Pcr, the Sharkey 1 Calculate the intensity.
Next, the thickness of the Sharkey 1 is determined from the strength of the Sharkey 1. However, as the Sharkey 1, a plurality of reinforcing bars having a thickness used for normal reinforcement are often used. At this time, the number of Sharkeys 1 is such that it has a cross-sectional area equal to or greater than the calculated thickness of Sharkey ( in FIG. 1A of the present embodiment, Sharkey 1 is the central part of the wall ). Shows an example of three installations).
[0020]
Thus, according to the present embodiment, the finished mortar 12 of the existing wall 10 is not removed, but the Sharkey 1 made of a reinforcing bar is embedded in the central portion of the existing wall 10 and both ends thereof protrude from the finished mortar 12. After fixing with a wire at the intersection of the vertical bars 21a and the horizontal bars 21b for constructing the increased reinforced concrete wall body 21, the reinforced concrete wall body 21 made of reinforced concrete is constructed, and the concrete wall body 11 of the existing wall 10 and the above-mentioned Since the additional reinforced concrete wall main body 21 behaves integrally, the removal work of the finishing mortar 12 can be omitted, and an increased reinforced concrete strength wall (reinforcing wall) having high earthquake resistance can be constructed at an early stage.
[0021]
In the above embodiment, the example in which the three shear keys 1 are provided in the center of the wall is shown. However, the number and thickness of the shear keys to be installed and the installation position are the size and thickness of the wall, the amount of bar arrangement, Needless to say, it is appropriately determined depending on the axial force applied to the incidental column and the structure of the incidental column. For example, as shown in FIG. 4A, four Sharkeys 1P may be used, and these Sharkeys 1P may be installed at positions symmetrical to the central portion O on the diagonal of the wall. Alternatively , as shown in FIG. 4 (b), one Sharkey 1Q is installed at the central portion O on the diagonal of the wall, and the four Sharky 1q are placed at positions symmetrical to the central portion O on the diagonal of the wall. You may make it install.
[0022]
In addition, for the buckling-proof shear keys 1, 1P, 1Q, the other end (the end on the side protruding to the reinforcing wall constructing portion) is a vertical or horizontal streak arranged when constructing the reinforcing wall, or Since both the vertical and horizontal bars are fixed, the existing wall concrete wall main body and the reinforced concrete wall main body can be firmly integrated.
[0023]
【The invention's effect】
According to the present invention described above, both the outer surface of an existing wall comprising a finishing mortar formed on the outer surface side of the concrete wall body and the wall body, the reinforcing wall construction unit comprising reinforcing bars made of longitudinal muscle and lateral stripes The reinforcing wall construction part and the existing wall are provided with buckling stoppers made of reinforcing bars penetrating through the existing wall at the center part of the existing wall, and both ends of the buckling stoppers are connected to the reinforcing bars of the reinforcing wall construction part. In addition to the fixed equipment, the center portion of the buckling stopper is fixed in the through-hole of the concrete wall body of the existing wall. and the concrete wall body out becomes to behave together by Me seat 屈止, Thereby, it is possible to build a high increase beating reinforced concrete reinforcing wall of earthquake resistance, further, finishing mortar removal work It can be omitted it is possible to construct a reinforced concrete reinforcing wall early and at a low price.
[0024]
According to invention of Claim 2, since the said buckling stop was provided in the diagonal concrete brace area | region in the shearing mechanism of a wall, it can increase with a small number, and can improve the earthquake resistance of a reinforced concrete reinforcement wall.
[0025]
According to the third aspect of the present invention, since the buckling stopper is provided at a plurality of positions symmetrical with respect to the center of the wall, the concrete wall main body 11 of the existing wall and the additional concrete wall main body 21 can be efficiently used. It can be integrated well.
[0026]
Reinforcing wall forming method according to claim 4, disposed Me seat屈止through the existing wall in the center portion of an existing wall comprising a finishing mortar formed on the outer surface side of the concrete wall body and the wall body The buckling prevention both ends fixed and the both ends of the buckling stopper are fixed to the reinforcing steel reinforcing bars and the reinforcing concrete reinforcing bars are arranged on both outer surfaces of the existing wall. And an additional reinforced concrete wall in which a formwork is placed outside the reinforcing steel for the reinforced concrete and then the concrete is cast to construct a reinforced concrete wall main body and then a finish is formed on the outer side of the reinforced concrete wall main body. Forming a buckling stop in the buckling stop disposing step, the step of providing the buckling stop at a plurality of positions symmetrical to the center of the wall and the central portion of the buckling stop. The concrete wall body of the existing wall and the reinforced concrete wall body of the reinforced concrete wall are connected by the above-mentioned buckling prevention (Sharkey). Even if there is a finishing mortar, the concrete wall main body 11 and the increased reinforced concrete wall main body behave integrally, so that the earthquake resistance of the increased reinforced concrete reinforcing wall can be improved.
[Brief description of the drawings]
FIG. 1 is a diagram showing a construction method of an reinforced concrete reinforced concrete seismic reinforcement wall according to an embodiment of the present invention , FIG. 1 (a) is an explanatory view thereof, and FIG. 1 (b) is an A view in FIG. It is sectional drawing along the -A line .
FIG. 2 is a diagram for explaining an earthquake resistance effect by a shear key (buckling prevention) in the embodiment disclosed in FIG . 1 , and FIG. 2 (a) is an oblique concrete brace region (shaded portion) formed by a shear resistance of a wall; FIG. 2B is an explanatory diagram showing the function of the shear key (buckling prevention) when the out-of-plane force F acts on the reinforcing wall 20 .
FIG. 3 is a diagram showing a specific installation situation of the shear key (buckling prevention) in the embodiment disclosed in FIG . 1, and FIG. explanatory view showing an example of a method, FIG. 3 (b) is an explanatory diagram showing an example in which both end portions are fixed to the vertical stripe and a horizontal stripe intersections of Sharkey (Me seat屈止).
FIG. 4 is a diagram showing an example of an installation position of a shear key (buckling stop) in the embodiment disclosed in FIG . 1, and FIG. 4 (a) is a case where two are installed on a diagonal line at an equal distance from the center position. the illustration shown, FIG. 4 (b) is an explanatory diagram showing the case equipped by two in and diagonally equidistant from the center position and the center position.
FIG. 5 is a diagram showing an example of seismic reinforcement work for a building wall according to a conventional example. FIG. 5 (a) is an explanatory view showing a state in which the finishing mortar of an existing wall is removed, and FIG. explanatory view showing respective installation situation of the anchor bolt and Haisuji, FIG. 5 (c) is an explanatory view showing a final finished reinforcing walls.
[Explanation of symbols]
1 Sharky (buckling stop)
DESCRIPTION OF SYMBOLS 2 Through-hole 3 Fixing material 10 Existing wall 11 Concrete wall main body of existing wall 12 Finishing mortar of existing wall 20 Reinforced concrete reinforcement wall 21 Reinforced concrete wall main body 21a Longitudinal reinforcement 21b Horizontal reinforcement 21c Width stop reinforcement 22 Finishing material of reinforcement wall 30 Pillar of building 40 Beam

Claims (4)

Provided on both outer surfaces of the existing wall consisting of a concrete wall main body and a finished mortar formed on the outer surface side of the wall main body, a reinforcing wall construction part including reinforcing bars consisting of vertical and horizontal bars,
Equipped with a buckling stopper composed of reinforcing bars penetrating the existing wall in the central part of the reinforcing wall construction part and the existing wall,
Both ends of the buckling stopper are fixed to the reinforcing bar of the reinforcing wall construction part, and the central part of the buckling stopper is fixed in the through hole of the concrete wall main body of the existing wall. Reinforced reinforced concrete reinforced wall. In the reinforced concrete reinforcing wall according to claim 1,
A reinforced concrete reinforced wall with increased strength, wherein the buckling stop is provided in an oblique concrete brace region formed by a shear resistance of the wall. In the reinforced concrete reinforcement wall according to claim 2,
Reinforced concrete reinforcement wall, wherein the buckling stops are provided at a plurality of positions symmetrical with respect to the center of the wall. A buckling prevention arrangement step of arranging a buckling prevention through the existing wall in the center of the existing wall composed of a concrete wall main body and a finishing mortar formed on the outer surface side of the wall main body;
A buckling stopper both ends fixing step of reinforcing reinforcing bars for concrete cast on both outer surfaces of the existing wall and fixing both ends of the buckling stopper to the reinforcing bars,
A reinforced concrete wall forming step in which a formwork is installed on the outside of the reinforcing concrete reinforcing bar and then concrete is placed to construct a reinforced concrete wall main body, and then a finishing material is formed on the outer side of the reinforcing concrete wall main body. With
In the buckling stop disposing step, the step of providing the buckling stop at a plurality of positions symmetrical with respect to the center of the wall, the step of fixing the center portion of the buckling stop in the concrete wall main body, A method for forming a reinforcing wall, comprising:

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