JPH09235892A - Facing repairing/reinforcing method for existing building - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an exterior modifying/reinforcing method for an existing building capable of simply improving the modulus of rigidity without decreasing the effective area of the building by constructing a plane of structure incorporating aseismatic elements such as braces or vibration control devices on the outer periphery of an existing building. SOLUTION: A plane of structure 8 arranged with braces 11 in it and incorporating vibration control devices 12 such as dampers is constructed with steel- framed columns 6 and beams 7 to be stretched at the outer peripheral section of an existing building 5. The plane structure 8 is rigidly connected to the outer peripheral section of the existing building 5 via brackets 10 fixed by anchor bolts 9 to the column/beam intersections of the existing building 5. The brackets 10 may be provided on the column portions or beam portions of the existing building 5 at proper intervals. An elasto-plastic damper, a frictional damper, or an oil damper is selectively used for the vibration control device 12. A new outer wall 15 made of cast-in-place reinforced concrete or a curtain wall is provided on the outside of the plane of structure 8. The reinforcing work in response to the request on the earthquakeresistant grade can be conducted, and an exterior reform can be also attained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for exterior renovation / reinforcement of an existing building.

[0002]

[Prior Art] Nearly 15 years after the revision of the seismic regulations of the Building Standards Act, buildings designed under the old standards (before 1981) are insufficient for underestimating the design seismic force and shear reinforcement of columns under the old standards, Furthermore, it is necessary to reinforce its deterioration,
In addition, seismic safety has become an issue after the Great Hanshin Earthquake.

Speaking of seismic safety, the current seismic retrofitting method is to add seismic wall 1 or brace 2 as shown in FIG. 16, or add sleeve wall 3 or to reinforce column 4. Has been done. Although not shown, it is also possible to increase the wall thickness of the seismic wall, increase the cross section of the brace, increase the cross section of the column, or put the entire building on the seismic isolation device as a special example. .

Explaining these in more detail, the seismic wall 1 to be added can be selected from cast-in-place wall, PCa plate wall, iron plate wall, concrete block wall, etc., and anchor bolts, resin anchors, adhesives, etc. for columns and beams. It is fixed via the purpose of improving the proof stress or the proof stress / toughness.

The brace 2 can be expanded by selecting an X-type brace, a K-type brace, a V-type brace, or another shape of brace as a brace, which is also intended to improve the proof strength or proof strength / toughness. .

The addition of the wall 3 serves as a cast wall and a PCa plate sleeve as this sleeve wall, and is intended to improve the yield strength.

In the case of reinforcing the column 4, a method of winding a steel plate around the existing column and filling the gap with non-shrinkage mortar, a method of winding a strip around the existing column and reinforcing it with post-cast concrete or mortar, In addition, a method of arranging welded wire mesh and FRP around and filling non-shrinkable mortar, applying post-cast concrete or mortar, edging the waist wall, etc. can be selected to improve the yield strength or toughness. To aim.

[0008]

Among the conventional seismic retrofitting methods described above, when the seismic wall 1, the brace 2 or the sleeve wall 3 is added, it is necessary to change the layout of the building due to this addition. In some cases, it may not be possible to add more locations where it is necessary for the functionality of the building. Also, at least the construction floor cannot be used during the construction period.

By increasing the thickness of the earthquake resistant wall, increasing the cross section of the brace, increasing the cross section of the pillar, etc., there is a risk that the effective area of the building will decrease. I can not use it.

By reinforcing the pillar 4, a steel plate, fiber or the like is wound around the pillar.
The sticking method increases the shear strength of the column, but does not improve the rigidity, and cannot improve the rigidity ratio and the eccentricity ratio. further,
With all of the above-mentioned reinforcements, the construction site will be the entire room, and the material will be carried in and out depending on the elevators and stairs, which will affect the building users.

On the other hand, in the method of placing the entire building on the seismic isolation device, the construction itself becomes large-scale, and there are restrictions on use during the construction period. In addition, the height of the building becomes higher and floors that cannot be used are created. Also, to install a seismic isolation device, it is necessary to create a dry area on the outer periphery of the building, but this is difficult to obtain on site and construction.

The object of the present invention is to eliminate the inconveniences of the above-mentioned conventional examples, to enable simultaneous seismic reinforcement and exterior remodeling, the effective area of the building does not have to be reduced, and restrictions on use inside the building and building users The objective is to provide a method for exterior renovation / reinforcement of existing buildings that can easily improve the rigidity and eccentricity with minimal impact on the building.

[0013]

In order to achieve the above-mentioned object, the present invention firstly constructs a new construction surface so as to closely adhere to or overhang the entire outer circumference or a part of the outer circumference of an existing building. , Incorporate a seismic control device on this structure and provide a new outer wall on the outside of the structure. Second, a new outer wall should be attached or overhanged to the entire outer circumference or part of the outer circumference of the existing building. The main idea is to construct a new structure and to incorporate seismic elements such as braces and walls into this structure, and to provide a new outer wall on the structure if necessary.

Thirdly, the new construction surface is provided with brackets on the pillar / beam intersections or pillars / beams of the existing building so that horizontal braces, slabs, PC boards, etc. can be formed on the outer periphery of the existing building. The main idea is to make a rigid joint.

According to the present invention as set forth in claims 1 and 2, it is basically not necessary to reinforce the parts other than the outer wall part, and a vibration control device is newly installed in the outer peripheral part of the building or Since a new seismic element is installed, the effective area does not decrease. 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 rigidity and the eccentricity can be easily improved by changing the number of seismic control devices, the number of seismic resistant elements, the size, and the arrangement, and the seismic resistance can be appropriately improved. Since the specialized heavy equipment such as crane hoisting equipment can be used from outside the building to carry in and out the materials involved in the construction, the impact on the building user can be minimized.

According to the present invention as set forth in claims 4 and 5, it is possible to make the connection between the new construction surface and the existing building more perfect.

[0018]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a plan view showing a first embodiment of an exterior renovation / reinforcement method of an existing building of the present invention, FIG.
Fig. 3 is a side view of the same, and Fig. 3 is a front view of a state in which an outer wall is removed.

In FIG. 1 and FIG. 2, reference numeral 5 denotes an existing building, but a new construction surface 8 made of steel columns 6 and beams 7 is constructed so as to project on the outer peripheral portion of the existing building 5.

As an example, a bracket 10 for fixing the pillar / beam intersection of the existing building 5 with anchor bolts 9 is attached, and the new construction surface 8 is rigidly joined to the outer peripheral portion of the existing building 5 via the bracket 10. I will.

Although not shown, the bracket 10 may be provided not at the pillar-beam intersection but at the pillar portion of the existing building 5 or the beam portion at appropriate intervals.

Further, a brace 11 is arranged in the construction surface 8 and, together with this, a vibration damping device 12 such as a damper is incorporated. The damper as the vibration control device 12 can be selected from an elasto-plastic damper, a Masatsu damper, a viscoelastic damper, an oil damper and the like.

In this embodiment, the brace 11 is made of S (steel frame).
As in the case of a V-shaped brace, to provide the opening 13, see FIG.
It becomes as shown in. In addition, in order to provide the opening 13 as another embodiment, the brace 11 and the vibration damping device 12 as shown in FIG.
In the case of the arrangement, or in the case of providing the pillar 14 in place of the brace as shown in FIG. 6, and in the case of no opening, the arrangement of the brace 11 and the vibration damping device 12 as shown in FIG. 7 and FIG. In addition to this, various variations are possible.

Then, a new outer wall 15 is provided outside the new construction surface 8. The outer wall 15 may be cast-in-place reinforced concrete or curtain wall. In addition, the old outer wall may be removed if necessary.

In this way, the existing building 5 is seismically reinforced by the new construction surface 8 incorporating the vibration control device 12, and at the same time, the exterior reformation is performed by the new outer wall 15.

Further, although not shown, the new construction surface 8 and the new outer wall 15 may be attached not only to the entire outer peripheral portion of the existing building 5 but also to only a part thereof. In the case, it will be only on the upper floor, or only on the left and right parts, leaving the central part.

Although it is necessary to provide a projecting portion between the new construction surface 8 and the existing building 5, FIGS. 9 to 14 show how to provide such a projecting slab 16, as shown in FIG. 9 and FIG. 10 shows the case where the horizontal beams 17a and 17b receive the slab 18, as shown in FIG.
12 is the beam when only the slab 18 is overhanged.
The horizontal braces 19 and slabs 18 of the truss are arranged in the frame of 17a and 17b.

FIG. 15 shows a second embodiment of the present invention. Like the first embodiment, a new construction surface 8 made of steel columns 6 and beams 7 is projected on the outer periphery of the existing building 5. However, seismic resistant elements with braces 11 are to be incorporated in this construction surface 8.

As the seismic resistant element, as shown in FIG. 4, FIG. 5, FIG. 7, and FIG. 8 in the first embodiment, the brace 11 may be a V-type brace, a diamond-shaped brace, or an X-type brace. In addition, a wall may be used instead of the brace 11, and various variations are conceivable, such as a case in which a column 14 is provided instead of the brace as shown in FIG.

In the second embodiment, a new outer wall 15 is provided outside the new construction surface 8 as needed. When the brace 11 and the seismic resistant element by the wall also serve as decoration of the exterior, the new outer wall 15 may be omitted.

In this way, the existing building 5 is aseismically reinforced by the new construction surface 8 incorporating seismic resistance elements such as the braces 11, and at the same time, exterior remodeling is performed by the new outer wall 15 and the new construction surface 8.

Further, also in the case of the second embodiment, a projecting portion may be provided between the new construction surface 8 and the existing building 5, and the projecting portion is as shown in FIGS. 9 to 14. In addition to the case where the overhang slab 16 is provided, when the slab 18 is received by the horizontal beams 17a and 17b as shown in FIGS. 9 and 10, only the slab 18 is overhanged as shown in FIGS. 11 and 12. In this case, as shown in FIGS. 13 and 14, there may be a case where the horizontal braces 19 and slabs 18 of the truss are arranged in the framework of the beams 17a and 17b.

In the above-described embodiment, the new building surface 8 is constructed so as to project from the steel frame columns 6 and the beams 7 on the outer peripheral portion of the existing building 5. However, the new building surface 8 is closely attached to the new building surface 8. It may be provided.

[0034]

As described above, the exterior renovation / reinforcement construction method for an existing building of the present invention can firstly perform exterior remodeling and seismic reinforcement at the same time, and secondly, the reinforcement work can be performed outside the building. Since it is carried out in the building, the function inside the building can be maintained even during the construction. Thirdly, since the inside of the existing building is not changed, the integration with the new external structure is structurally clear, and fourth, the owner. It is possible to design the structure of the external new construction surface in accordance with the requirements for the seismic grade of the product. Fifth, the torsional vibration caused by the displacement of the center of gravity and the rigid center in the building plane can also be properly arranged on the external construction surface. It can be modified and, sixthly, it is possible to freely select the exterior material.

[Brief description of drawings]

[Fig. 1] The first exterior repair / reinforcement method of an existing building according to the present invention
It is a top view showing an embodiment.

[Fig. 2] The first exterior repair / reinforcement method of the existing building of the present invention
It is a side view showing an embodiment.

[FIG. 3] First of exterior repair / reinforcement method of existing building of the present invention
It is a front view of the state which removed an outer wall which shows an embodiment.

FIG. 4 is a front view showing an opening.

FIG. 5 is a front view showing a third embodiment.

FIG. 6 is a front view showing a fourth embodiment.

FIG. 7 is a front view showing a fifth embodiment.

FIG. 8 is a front view showing a sixth embodiment.

FIG. 9 is a plan view showing a first example of an overhang portion.

10 is a cross-sectional view taken along the line aa of FIG.

FIG. 11 is a plan view showing a second example of an overhang portion.

12 is a sectional view taken along line bb of FIG.

FIG. 13 is a plan view showing a third example of an overhang portion.

14 is a sectional view taken along the line cc of FIG.

FIG. 15 is a plan view showing a second embodiment of a method of exterior repair / reinforcement of an existing building of the present invention.

FIG. 16 is an explanatory diagram showing a conventional example.

[Explanation of symbols]

 1 ... Earthquake-resistant wall 2 ... Brace 3 ... Sleeve wall 4 ... Pillar 5 ... Existing building 6 ... Pillar 7 ... Beam 8 ... Construction surface 9 ... Anchor bolt 10 ... Bracket 11 ... Brace 12 ... Seismic control device 13 ... Opening 14 ... Strut 15 ... Outer wall 16 ... Overhanging slab 17a, 17b ... Beam 18 ... Slab 19 ... Horizontal brace

Front page continuation (72) Inventor Genichi Takahashi 1-2-7 Motoakakasaka, Minato-ku, Tokyo Kashima Construction Co., Ltd. (72) Inventor Yukazu Takeda 6-3-18 Roppongi, Minato-ku, Tokyo Toyo Within Shatter Co., Ltd.

Claims (7)

[Claims] 1. An exterior of an existing building, characterized by constructing a new structure on the outer periphery of an existing building, incorporating a vibration control device on the structure, and providing a new outer wall on the outside of the structure. Repair / reinforcement method. 2. A method of exterior renovation / reinforcement for an existing building, characterized by constructing a new structure on the outer periphery of an existing building and incorporating seismic resistant elements such as braces and walls on this structure. 3. The exterior renovation / reinforcement method for an existing building according to claim 2, further comprising providing a new outer wall on the construction surface if necessary. 4. The existing construction according to any one of claims 1 to 3, wherein the new construction surface is rigidly joined to the outer peripheral portion of the existing building by attaching a bracket to the pillar / beam intersection of the existing building. Building exterior renovation / reinforcement method. 5. The existing building according to any one of claims 1 to 4, wherein the new construction surface is provided with a bracket attached to a pillar or a beam portion of the existing building and thereby rigidly joined to the outer peripheral portion of the existing building. Exterior repair and reinforcement method. 6. The exterior repair / reinforcement method for an existing building according to claim 1, wherein the outer circumference of the existing building is the entire circumference. 7. The exterior repair / reinforcement method for an existing building according to claim 1, wherein the outer circumference of the existing building is a part of the entire circumference.