JPH11324341A - Reinforcement structure of masonry building and aseismatic modification method therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a reinforcement structure of a masonry building and an aseismatic modification method therefor, by which the aseismatic safety can be heightened, the building can be preserved good from design and technical viewpoints and which is excellent in workability. SOLUTION: This reinforcement structure of a masonry building is so constructed that at least a part of a wall body 12 is parted to form a wall structural member 26, the wall structural member 26 is removed, an underground beam 15 is newly provided in a portion where to newly install a wall structural member 26, a wall structural member 26 is again erected on the underground beam 1, a through hole 20 is formed in the wall structural member 26, a PC steel rod 18 is inserted in the through hole 20, the lower end 18b of the PC steel rod 18 is fixed to the underground beam 15, a steel frame beam 16 is provided on the upper end surface 12a of the wall body 12, and then tensile force is applied to the PC steel rod 18 with the underground beam 15 and the steel framed beam 16 taken as tension ends.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a masonry building reinforcement structure for reinforcing a masonry building, and a method for improving the seismic resistance of a masonry building.

[0002]

2. Description of the Related Art In recent years, there has been an increasing interest in the "preservation and utilization" of masonry buildings of historical value, including Western brick buildings constructed in the Meiji and Taisho eras. To achieve this, it is necessary to balance the preservation of the cultural value inherent in the building with the renovation of the building to regenerate and use it. In many cases, seismic retrofitting is required to ensure safety, which is the basic performance of buildings. Conventionally, reinforced concrete and steel frames have been used for reinforcement.

FIGS. 5 to 7 show examples of such seismic retrofitting. Among them, FIG. 5 shows an example in which a steel frame reinforcing structure 3 is provided outside the wall body 2 constituting the brick building 1, and FIG. 6 shows a reinforced concrete wall 5 along the wall body 2. FIG. 7 shows a brick building 1
This is an example of a case where a steel structure 10 including beams 7, columns 8 and braces 9 is provided inside the wall 2 constituting the structure 2, and the wall 2 is structurally supported by the steel structure 10.

[0004]

However, according to the seismic retrofit shown in FIG. 5, the wall 2 has a structure in which the wall 2 is partially reinforced by a steel frame. Since the strength of the body 2 is the same as before, there is a concern that damage such as cracks may occur between the bricks constituting the wall body 2 and the joint mortar at the time of this earthquake. Further, according to this seismic retrofitting, the appearance of the brick building 1 is changed by the reinforcing structure 3, and there is a problem particularly in application to a building having a historical value in the external design. Furthermore, in this seismic retrofitting, there may be a problem in the construction of the steel frames constituting the reinforcing structure 3 or in the fitting of the joints, and the workability may not be good.

The seismic retrofit shown in FIG. 6 can reinforce the entire wall 2 and is excellent in seismic safety, but there is a problem from the viewpoint of preserving technology at the time of construction. Was. In addition, when the concrete wall is formed along the wall body 2 in this manner, there is a concern that the appearance design of the brick building 1 is impaired due to the whitening phenomenon of the concrete.

Further, in the seismic retrofit shown in FIG. 7, there is a possibility that a crack may be generated between the brick and the joint during an earthquake, as in the case of FIG. In addition, steel structure 1
In order to structurally support the wall body 2 by using 0, there is also a problem in terms of conservation of construction technology. Furthermore, in this seismic retrofit, it may be difficult to reliably attach the reinforcing material constituting the steel structure 10 to the brick, and there may be a problem in workability.

[0007] In view of such circumstances, the present invention provides a structure that is high in seismic safety, capable of favorably preserving the building from a design and technical point of view, and excellent in workability. An object of the present invention is to provide a reinforcement structure for a building and an earthquake-resistant repair method.

[0008]

Means for Solving the Problems To solve the above problems, the present invention employs the following means. The reinforcement structure for a masonry building according to claim 1, wherein the penetrating structure penetrates a wall constituting the masonry building from one end face of the wall body to another end face located opposite to the one end face. A hole is provided, a tension member is inserted into the through hole, a fixing member is provided on the one end surface and the other end surface, and both ends of the tension member are fixed to these fixing members, In addition, it is characterized in that a tension is applied to these fixing members as tension ends.

In the reinforcement structure of a masonry building, an axial stress in the direction along the tension member can always be applied to the wall, whereby the material such as bricks and the joint material constituting the wall are formed. , A compressive force is applied between them to prevent separation between them.

According to a second aspect of the present invention, there is provided a method for improving the seismic resistance of a masonry building, wherein at least one of the walls constituting the masonry building is provided. By dividing the portion with a virtual plane intersecting the wall, a wall structure is formed, and the wall structure is removed while maintaining its shape, while the wall structure is removed from one end face of the wall structure. A through-hole is formed so as to penetrate the other end face facing the one end face, and a tension member is inserted into the through-hole, and a fixing member is provided along the one end face and the other end face, It is characterized in that the tension member is used as a tension end to apply tension to the tension member, and thereafter, the wall is formed again by using the wall component.

According to this seismic retrofitting method, the wall is reinforced by seismic retrofitting without affecting the external design while utilizing the masonry structure. be able to.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of the present invention will be described with reference to the drawings. The embodiment described here is an example in which a brick building 11 is relocated and seismic reinforcement is applied.

FIG. 2 shows a wall 1 constituting a brick building 11.
FIG. 3 is a diagram illustrating a schematic configuration of a reinforcing structure provided for the second embodiment; As shown in FIG.
(Fixing member) 15 which is provided below and supports the wall 12, a steel beam (fixing member) 16 which is provided on the upper end surface 12 a of the wall 12, an underground beam 15 and a steel beam 16 And PC steel rods (tensile members) 18,... Provided so as to penetrate the wall 12 up and down. The steel bars 16 and the underground beams 15 are tensioned ends of the PC steel bars 18,...

FIG. 1 shows the wall 12 and the reinforcing structure 1.
FIG. 4 is a diagram showing details of the structure of FIG. As shown in the figure, the wall 12 is erected on the underground beam 15 and is integrated with the floor slab 19. Also, wall 1
2 is provided with a through hole 20 penetrating vertically from the upper end surface 12a to the lower end surface 12b, and the PC steel rod 18 is inserted through the through hole 20.

An anchor plate 21 and a nut 22 are provided on the upper end 18a of the PC steel bar 18, and the PC
The steel bar 18 is configured to obtain a reaction force from the steel beam 16 via the anchor plate 21 and the nut 22. The lower end 18b of the PC steel bar 18 is
Is connected to an anchor bolt 24 also buried in the underground beam 15 through a sleeve joint 23 buried in the underground beam, and the PC steel rod 18 is connected to the underground beam through the anchor bolt 24 and the sleeve joint 23. 15 to obtain the reaction force.

The structure of the reinforcing structure 14 has been described above. Next, a method of relocating the brick building 11 using the reinforcing structure 14 and a method of seismic retrofitting performed in parallel thereto will be described.

First, prior to the relocation, a strength test is performed on the bricks and joint mortar constituting the wall 12. This means that, when seismic retrofit using the reinforcing structure 14 is performed on the wall 12, a compressive force acts on the brick and the joint mortar due to the tension applied to the PC steel bar 18. Therefore, it is necessary to determine beforehand whether or not the bricks and joint mortar of the wall 12 can withstand the compressive force or the like. In this case, when it is necessary to measure the shear strength of the joint mortar, it is preferable to use the shear strength measurement method described in Japanese Patent Publication No. 3-27063 disclosed by the present applicant. it can.

After it is confirmed by the above-described strength test that a compressive force can be applied to the wall 12, the wall 12 is then moved to the wall 12 as shown in FIG. 12 are formed by dividing the virtual vertical plane perpendicular to the vertical plane 12. In this case, when dividing the wall 12, as shown in FIG. 3, mounts 28, 28 for preventing the wall component 26 from falling over are provided in advance at the division target positions of the wall 12. Further, the wall body 12 is divided by using a wall saw 29 as shown in FIG. 4 and guiding the wall saw 29 by a guide rail 30 arranged vertically along the wall body 12.

After the wall body 12 is divided into the wall structures 26 in this manner, these wall structures 26,.
Is removed while keeping its shape, moved to a storage location and temporarily placed. In parallel with these operations, a new underground beam 15 is provided at a location where the wall 12 is to be relocated. In this case, the underground beam 15 has an anchor bolt 24 and a sleeve joint 23 as shown in FIG.
Is buried.

Next, the wall structures 26 are set at predetermined positions on the underground beam 15. In this case, a mortar M (see FIG. 1) is laid at the installation target position of the wall structure 26 above the underground beam 15, and the wall structures 26,. In this case, an adhesive may be used instead of the mortar M. At this time, a gantry for overturn prevention as shown in FIG. 3 is installed on the wall structure 26.

Next, the through hole 20 as shown in FIG. 1 is formed by drilling the wall structure 26, and the PC steel rod 18 is inserted into the through hole 20. Then, the lower end 18b of the PC steel bar 18 is fixed to the sleeve joint 23, while the steel beam 16 is provided on the upper end surface 26a of the wall structure 26 (see FIG. 1). The plate 21 is set.

Thereafter, a nut 22 is screwed onto the upper end 18a of the PC steel rod 18, and by tightening the nut 22, tension is introduced into the PC steel rod 18 and the upper end 1a is tightened.
8 a is fixed to the steel beam 16 via the anchor plate 21. Further, grout is applied to the through hole 20 to obtain the reinforcing structure 14 as shown in FIG.

Further, the wall structure 26 provided with the reinforcing structure 14 is continuously provided on the underground beam 15 in the procedure as described above, so that the wall 12 is provided on the underground beam 15. Reconfigure.

In the above-mentioned reinforcing structure 14 of the brick building 11 and the seismic retrofitting method, since the vertical axial stress can be applied to the wall 12, the individual bricks and the joint mortar are separated from each other. Can be prevented. In the case of general brick buildings, many cases have been reported in which the top of the brick wall collapses out of plane near the upper part of the building during an earthquake, and the axial stress in the vertical direction increases toward the top of the wall. It is described that, because the bending deformation increases, the bricks and the joint mortar easily separate from each other while the bending deformation increases. On the other hand, according to the present embodiment, the wall member 12 can be prevented from being broken by bending deformation by newly applying a vertical axial stress. Furthermore, in this case, unlike the conventional seismic reinforcement using a steel frame, there is no concern that a part of the wall body 12 will be destroyed in advance of an earthquake, and safety can be improved.

Further, by applying a compressive force to the brick and the joint mortar in this manner, it is possible to enhance the horizontal shear strength of the joint mortar. Further, the same effect can be expected on the out-of-plane according to the wall thickness of the wall body 12, and the function of preventing the brick from falling out of the plane at the time of the ultimate destruction due to the earthquake can be obtained. it can.

The reinforcing structure 1 of the brick building 11 described above
4 and the seismic retrofitting method, instead of adding a resistance element that is mechanically different from the original mechanism as in the case of conventional reinforced concrete and steel frame reinforcement, it is necessary to make use of the brick structure as it is to perform seismic reinforcement. it can. Therefore, compared with the conventional technology, the significance from the viewpoint of preserving the technology is high.

Conventionally, particularly in the case of reinforcing with a steel frame, if the rigidity of the steel frame is low, the reinforcing effect appears after partial damage of the brick wall occurs first, so that it is necessary to provide a strong reinforcing. It is necessary, and this requires the steel frame to be large-scale, and the interior and appearance of the building may be impaired. On the other hand, in the reinforcing method of the present embodiment, the main part of the reinforcing member is However, since the shape is built into the wall body 12, the space required for installing the reinforcing member is small, and the appearance and the interior of the building are easily preserved.

Further, the above-described reinforcing structure 1 of the brick building 11
In the method 4 and the seismic retrofitting method, it is possible to avoid the problem of the service life associated with the reinforcement by the reinforced concrete and the effect of the efflorescence phenomenon of the concrete on the brick.
Furthermore, compared with the method of replacing the structural body with the reinforced concrete structure, there is an advantage that the specific gravity that can leave the current material is high from the viewpoint of preserving the building.

In the above embodiment, other configurations may be adopted without departing from the spirit of the present invention. For example, in the above embodiment, the brick building 1
Although the example of the case where the building 1 is relocated has been described above, the above-described seismic retrofitting method may be applied to a case where the brick building 11 is stored and utilized in the original place.

In the above-described embodiment, the drilling of the through-hole 20 is performed after the wall 12 is erected on the underground beam 15. The drilling operation of the through-hole 20 may be performed while the storage 26 is temporarily stored.

The through holes 20 may be formed before the wall 12 is divided. In this case, when the wall structure 26 is transported, a tension member is inserted into the through hole 20 and a compressive force is applied to the wall structure 26 from the end surface using the tension member, so that the wall during transportation can be moved. Structure 26
Can be prevented from being destroyed.

Further, instead of the steel beam 16 used in the above embodiment, a beam made of reinforced concrete may be used.

In the above embodiment, the mortar M and the adhesive used in place of the mortar M are used when the wall 12 is erected on the underground beam 15 beforehand. Although the configuration is such that the mortar M or the adhesive is used as a post-installation grout, the configuration is such that the mortar M or the adhesive is used instead.

In the above-described embodiment, the through hole 20 and the PC steel bar 18 are provided in the vertical direction.
The steel bar 18 may be provided in a horizontal direction or an oblique direction. In this case, instead of the underground beam 15 and the steel beam 16 used as the tension end of the PC steel bar 18, a member extending vertically along the side end surface of the wall structure 26 is arranged. This may be used as a tension end.

Further, in the above embodiment, the PC
After tension is introduced into the steel bar 18, grout is applied to the through hole 20.
By pre-coating 8 with epoxy or the like, the PC steel rod 18 may be used as an unbonded PC steel material and grout may be omitted.

In the above embodiment, the wall 1
2 is divided by an imaginary vertical plane, but instead, the wall 12 extends horizontally or obliquely according to the positional relationship of an opening or the like provided in the wall 12. You may make it divide | segment by a virtual plane.

Further, in the above embodiment, the brick building 1
However, the above-described reinforcement structure 14 and the seismic retrofitting method may be applied to other masonry buildings.

In addition, any other configuration may be adopted without departing from the spirit of the present invention. Further, the above-described modifications may be selectively combined and used as appropriate. Needless to say, this may be done.

[0039]

As described above, in the masonry building reinforcement structure and the seismic retrofitting method of the present invention, an axial stress in a predetermined direction is applied to a wall constituting a masonry building. Therefore, it is possible to prevent the component members such as individual bricks and the joint mortar from peeling, and to prevent the wall body from being broken by bending deformation. In addition, since the horizontal shear strength of the joint mortar can be enhanced by this, the safety is higher than that of the conventional seismic reinforcement using a steel frame. Further, the same effect can be expected for the out-of-plane according to the wall thickness of the wall, and it is also possible to prevent each component from falling out of the plane at the time of eventual destruction due to an earthquake. In addition, in the reinforcement structure and seismic retrofitting method for masonry buildings, unlike the conventional reinforcement with reinforced concrete and steel frames, resistance elements that are mechanically different from the original mechanism are not added, Since seismic reinforcement can be performed using the mechanism as it is, it is of great significance in terms of technology conservation, especially when masonry buildings have historical value. In addition, in this reinforcing structure and the seismic retrofitting method, since the main part of the reinforcing member is built into the wall, the space required for installing the reinforcing member is small, and it is easy to preserve the appearance and the interior of the building. Become. In addition, the reinforcement structure and the seismic retrofitting method can avoid the problem of the service life associated with the reinforcement by reinforced concrete and the effect of the efflorescence phenomenon of concrete on the bricks. Compared to the method, the specific gravity that can keep the current material is high from the viewpoint of preserving the building.

[Brief description of the drawings]

FIG. 1 is a view schematically showing one embodiment of the present invention, and is an elevational sectional view showing a reinforcing structure of a brick building and a wall to which the reinforcing structure is applied.

FIG. 2 is a perspective sectional view showing a reinforcing structure of the brick building shown in FIG. 1 and an appearance of a wall body to which the same is applied.

FIG. 3 is a view showing a method of rehabilitating a brick building according to the present invention in an earthquake-resistant manner, and is a perspective view showing a situation in which a stand for preventing overturning is installed on a wall to be divided.

FIG. 4 is a perspective view showing a situation when the wall is divided using a wall saw.

FIG. 5 is a view showing a conventional technique of the present invention, and is a perspective view showing an example in which a wall of a brick building is reinforced.

FIG. 6 is a perspective view showing another example of the same.

FIG. 7 is a perspective view showing still another example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Brick building 12 Wall 12a Upper end surface 12b Lower end surface 14 Reinforcement structure 15 Underground beam (beam material) 16 Steel beam (beam material) 18 PC steel bar (tensile material) 18a Upper end 18b Lower end 20 Through hole 26 Wall structure 26a Top surface

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Masaaki Takahashi 1-3-2 Shibaura, Minato-ku, Tokyo Shimizu Corporation (72) Inventor Yutaka Saito 1-2-3 Shibaura, Minato-ku, Tokyo Shimizu Corporation Inside the corporation

Claims (2)

[Claims] 1. A wall constituting a masonry building is provided with a through hole penetrating from one end face of the wall body to another end face located opposite to the one end face. A tension member is inserted, a fixing member is provided on the one end surface and the other end surface, and both ends of the tension member are fixed to these fixing members, and these fixing members are used as tension ends. A reinforcement structure for a masonry building, wherein the reinforcement structure is provided with a tension. 2. A seismic retrofitting method for improving the seismic resistance of a masonry building, wherein at least a part of a wall constituting the masonry building is divided by a virtual plane intersecting the wall. Thereby forming a wall structure, removing the wall structure while maintaining its shape, and penetrating from one end surface of the wall structure to another end surface facing the one end surface. Such a through hole is formed, and a tension member is inserted through the through hole, and a fixing member is provided along the one end surface and the other end surface. A seismic retrofitting method for a masonry building, wherein a force is applied, and after that, the wall is formed again using the wall constituent.