JP3235716B2 - Seismic retrofitting method for existing buildings - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a repair method for improving the seismic performance of an existing building.

[0002]

[Prior art] Many years have passed since the revision of the seismic regulations in the Building Standards Law. Buildings designed under the old standards (prior to 1981) require repairs for their aging, and the earthquake was triggered by the Great Hanshin Earthquake. Safety is a problem.

[0003] With regard to seismic safety, current methods of seismic reinforcement include the addition of earthquake-resistant walls, the addition of braces, and the like.
Or, a wall is added or a pillar is reinforced. Furthermore, it is conceivable to increase the wall thickness of the earthquake-resistant wall, increase the cross-section of the brace, increase the cross-section of the column, or as a special case, put the entire building on the seismic isolation device.

[0004] To explain these in more detail, the seismic wall to be added can be selected from a cast-in-place wall, a PCa plate wall, an iron plate wall, a concrete block wall and the like, and is fixed to a column / beam via an anchor bolt or the like. Is intended to improve proof stress or proof stress and toughness. When the brace is added, an X-shaped brace, a K-shaped brace, a V-shaped brace, or any other brace can be selected as the brace, and this is also for the purpose of improving the yield strength or the yield strength / toughness.

[0005] The addition of a sleeve wall is a cast-in-place wall or a PCa plate-sleeved wall, which is expected to improve the proof stress. In the case of column reinforcement, a method of winding steel plates around existing columns and filling non-shrink mortar in gaps, winding a stirrup around existing columns, reinforcing with post-cast concrete or mortar, other welding wire mesh, A method of arranging FRP around, filling with non-shrink mortar, or applying post-cast concrete or mortar, a method of trimming a lumbar wall, and the like can be selected, and the purpose is to improve proof stress or toughness.

[0006]

Among the conventional seismic retrofitting methods described above, in the case of adding an earthquake-resistant wall, a brace or a sleeve wall,
Due to this addition, it is necessary to change the layout of the building, and it may not be possible to add the building to a necessary place for the function of the building. Also, at least the construction floor cannot be used during the construction period.

[0007] The method of increasing the thickness of the earthquake-resistant wall, enlarging the cross section of the brace, or enlarging the column section may decrease the effective area of the building. I can not use it.

[0008] In the reinforcement of pillars, steel pillars, methods such as Hal winding the fiber or the like, the shear strength of the pillar is increased, but not to the improvement of the bending strength and stiffness, rigidity, improvement of polarized heart rate Can not.
In addition, all of the above-mentioned reinforcements require a construction site to be installed in the entire room, and the loading and unloading of materials depends on elevators and stairs, which affects building users.

On the other hand, in the method of mounting the whole building on the seismic isolation device, the construction itself becomes large and there is a restriction on use during the construction period. In addition, the height of the building becomes higher and floors that cannot be used are created. In addition, to install a seismic isolation device, it is necessary to provide a dry area on the outer periphery of the building, but this cannot be easily achieved on the site and construction.

[0010] An object of the present invention is to solve the above-mentioned disadvantages of the prior art, and to simultaneously perform seismic reinforcement and exterior renovation, without reducing the effective area of the building, restricting the use of the inside of the building and the building user. It is an object of the present invention to provide a seismic retrofitting method for an existing building that requires minimal impact on the building.

[0011]

In order to achieve the above object, the present invention comprises a steel column and a steel beam on the outer periphery of an existing building.
A steel frame is installed in front of the reinforced concrete columns of the existing building.
The steel column of the steel frame is replaced with the reinforced concrete beam of the existing building.
The steel frame of the steel frame is matched to the steel frame, and the steel columns and the steel beams of the steel frame are planted with stud bolts on the web so that the reinforced concrete columns and reinforced concrete beams of the existing building also face the stud bolts. An adhesive anchor was implanted, and high-strength non-shrinkable concrete was filled to integrate the steel columns of the steel frame with the columns of the existing building, and the steel beams of the steel frame with the beams of the existing building, and The main purpose is to arrange the reinforcing bars in the space surrounded by the outer surfaces of the reinforced concrete columns and reinforced concrete beams of the existing building, the steel columns, and the flanges of the steel beams.

According to the first aspect of the present invention, a new aseismic element is attached to the outer periphery of the building by integrating the steel frame provided on the outer periphery with the existing building, so that the effective area in the existing building is reduced. Absent. Further, since the construction is performed only on the outer peripheral portion of the building, use restrictions inside the building can be minimized. In addition to this, the loading and unloading of materials accompanying construction can be performed by heavy construction equipment such as a crane lifting device from outside the building, so that the impact on building users can be minimized.

According to the second aspect of the present invention, in addition to the above operation, the steel frame provided on the new outer peripheral portion can be more completely integrated with the existing building.

[0014]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a front view showing an embodiment of the seismic retrofitting method for an existing building according to the present invention, FIG. 2 is a vertical sectional side view of the same main part, and FIG. 3 is a cross-sectional plan view of the same main part. Existing building 1a is a (steel) reinforced concrete column and 1b is a (steel) reinforced concrete beam forming a frame of the existing building 1.

A steel frame 2 composed of a steel column 2a and a steel beam 2b is provided on the outer periphery of the existing building 1. The steel frame 2 incorporates a V-shaped brace 2c. The steel frame 2a corresponds to the reinforced concrete column 1a of the existing building 1 and the steel frame 2b corresponds to the reinforced concrete beam 1b. And the steel column 2a of the steel frame 2
And the reinforced concrete column 1a of the existing building 1 and the steel beam 2b of the steel frame 2 and the reinforced concrete beam 1 of the existing building 1
b were integrated.

The steel frame 2 has a steel column 2a and a steel beam 2
b, the finishing material 10 may be attached to the brace 2c before construction.

In this embodiment of the integration, a stud bolt 4 is welded on the steel frame 2 forming the steel column 2a and the steel beam 2b on the steel frame 2 side. The stud bolts 4 protrude toward the existing building 1 and fit between the flanges 6.

On the other hand, from the reinforced concrete column 1a or the reinforced concrete beam 1b of the existing building 1, an adhesive anchor 5 which is formed by filling an adhesive into a drilled hole and fixing a stud bolt is planted, and this is mounted on the stud. It was opposed to the bolt 4. The stud bolt 4 and the adhesive anchor 5 are wrapped so as to be aligned with each other as shown.

In this way, the stud bolts 4 and the adhesive anchors 5 are disposed between the flanges 6 of the steel columns 2a and the steel beams 2b and in the space surrounded by the reinforced concrete columns 1a and the reinforced concrete beams 1b of the existing building 1. ,further,
Reinforcing bars 7 formed by a combination of a reinforcing bar extending in the longitudinal direction and a U-shaped hoop bar are arranged here, and high-strength non-shrinkable concrete 9 is filled for integration.

The reinforcing bar 7 can be easily arranged by welding a hoop to the flange 6 of the steel column 2a or the steel beam 2b at its end and fixing the reinforcing bar extending in the length direction to the hoop.
When the high-strength non-shrinkage concrete 9 is cast, the flange 6 serves as a formwork, so that the concrete can be easily set without a separate formwork.

Then, a new outer wall is provided on the new steel frame 2. This outer wall can be any cast-in-place reinforced concrete or curtain wall. In addition, existing building 1
The old outer wall of the may be removed if necessary.

All such constructions are performed outside of the construction site, and materials are carried in and out using an external crane, and can be performed without affecting building users as shown in FIG. FIG. 6 shows an example of the appearance of the building before the renovation, and FIG. 7 shows an example of the appearance of the building after the renovation.

[0023] Besides the above embodiments, to integrate the steel column 2a of the steel frames 2 Concrete Columns 1a of existing buildings 1, and the steel beam 2b of steel frames 2 and existing buildings 1 reinforced concrete beams 1 b Next, in the joint panel zone of the column and the beam of the steel frame 2, an adhesive anchor 8a as shown in FIG.
And the fixing plate 8b may be directly fixed to the existing building 1 side, and although not shown, a method of fastening with a steel band or the like is also conceivable.

Further, in addition to the provision of such a steel frame 2, it is also necessary to add an appropriate earthquake-resistant wall outside (incorporated into the first and second floors of the steel frame 2) and inside. Improving performance is also conceivable.

[0025]

As described above, the seismic retrofitting method for an existing building according to the present invention can perform seismic retrofitting and exterior renovation simultaneously, without reducing the effective area of the building.
The use restrictions inside the building and the impact on building users can be minimized.

[Brief description of the drawings]

FIG. 1 is a front view showing an embodiment of an earthquake-resistant repair method for an existing building according to the present invention.

FIG. 2 is a longitudinal sectional side view of a main part showing an embodiment of an earthquake-resistant repair method for an existing building according to the present invention.

FIG. 3 is a cross-sectional plan view of a main part showing one embodiment of the seismic retrofitting method for an existing building of the present invention.

FIG. 4 is a side view of a main part showing another example of integration.

FIG. 5 is a front view showing a state of a room under construction.

FIG. 6 is a perspective view showing an appearance of a building before renovation.

FIG. 7 is a perspective view showing the appearance of the building after the renovation.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Existing building 1a ... Reinforced concrete column 1b ... Reinforced concrete beam 2 ... Steel frame 2a ... Steel column 2b ... Steel beam 2c ... Brace 3 ... Web 4 ... Stud bolt 5 ... Adhesive anchor 6 ... Flange 7 ... Rebar 8a ... Adhesive anchor 8b: Fixing plate 9: High-strength non-shrink concrete 10: Finishing material

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) E04G 23/02

Claims (2)

(57) [Claims] (1) Steel columns and steel beams on the outer periphery of an existing building
A steel frame, and reinforced concrete columns of existing buildings
The steel columns of the steel frame to the reinforced concrete of the existing building.
The steel beam of the steel frame is matched to the steel beam, and the frame is combined.The steel column and the steel beam of the steel frame are planted with stud bolts on the web, and the reinforced concrete columns and reinforced concrete beams of the existing building also face this stud bolt. The steel anchor of this steel frame and the column of the existing building, and the steel beam of the steel frame and the beam of the existing building were integrated by implanting the adhesive anchor and filling high-strength non-shrinkable concrete A seismic retrofitting method for existing buildings. 2. The seismic retrofitting method for an existing building according to claim 1, wherein the reinforcing bars are arranged in a space surrounded by the outer surface of the reinforced concrete column or the reinforced concrete beam of the existing building, the steel column and the flange of the steel beam.