JPH10292638A - Building reinforcing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent stress concentration of a joint part by providing a reinforcing frame of RC rigid-frame structure with opening parts, in line with the side face of an existing building, independently of the building, and then jointing the reinforcing frame to the building with concrete. SOLUTION: A reinforcing frame 2 formed of precast concrete is provided in line with at least one side face of an existing building 1, with a separate foundation independent of the foundation of the existing building 1, leaving a required opening part. In case there are extension parts 6, 7 and the like, a reinforcing frame fit for them is provided. Connecting reinforcements are then arranged between the reinforcing frame 2 and the existing building 1 by grouting concrete to joint both of them. The existing building 1 is resuscitated as a building of new design, and stress caused by an earthquake or the like is dispersed to the whole reinforcing frame 2 so as to prevent the increase of a burden imposed on the foundation of the existing building 1. The existing building 1 can therefore be used even under construction. A construction period can be shortened, and construction cost can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a method for reinforcing a building.

[0002]

2. Description of the Related Art Conventionally, buildings have been retrofitted with seismic retrofits such as adding earthquake-resistant walls, adding braces, installing buttresses on the outer surfaces of buildings, and covering columns with fiber sheets or the like to increase their toughness. For example, a method of joining a reinforcing frame to a key point of a frame of an existing building has been performed.

[0003] However, in the methods of (1) and (2), the opening is closed, so that the flow line is affected, and not only the appearance design is impaired, but also lighting and ventilation are hindered, and the weight of the building increases. Causes insufficient strength of existing foundations. In addition, according to the method, the opening is not closed, but it is difficult to join the new part with the existing building, and there is a possibility that the newly built part may be lifted, and the method must be an independent pillar such as a stairwell. Not applicable.

Furthermore, the methods (1) and (2) have a drawback that it is difficult to use the internal space because the work must be performed indoors. Further, the method does not solve the disadvantage that the load applied to the foundation increases.

[0005]

DISCLOSURE OF THE INVENTION The present invention does not impair the functions of buildings such as traffic lines, lighting, ventilation, etc., revives the appearance, adds new functions, and does not burden existing foundations. It is an object of the present invention to provide a method of reinforcing a building that can be used even during construction, is easy to perform, and hardly causes stress concentration at a joint with an existing building.

[0006]

SUMMARY OF THE INVENTION According to the present invention, there is provided a method for reinforcing a building, wherein a reinforcing frame having an independent foundation portion is provided on at least one side of the existing building at least at one of the openings of the existing building. It is characterized by being erected at a position where a part is left, and joining the reinforcing frame and the existing building.

[0007] Since the weight of the reinforcing frame is added to the foundation, there is no increase in the load on the foundation of the existing building. Also,
By joining the reinforcement frame to the outside of the existing building, it can be revived as a new design building. Furthermore, by installing the reinforcing frame at a position leaving at least a part of the opening, the flow line is not affected, so that the usability does not change and the lighting and ventilation are not hindered.

After the reinforcing frame has an RC frame structure, a reinforcing bar is arranged between the reinforcing frame and the existing building, concrete is poured around the reinforcing bar, and the reinforcing frame and the existing building are joined. Is also good. It is desirable to form the reinforcing frame from a precast concrete member because the on-site construction is simplified and the construction period is shortened.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIGS. 1 and 2 show that a reinforcing frame 2 is erected substantially over the entire surface outside two surfaces along the weak axis (longitudinal) direction of an existing building 1. 1 shows a building that is connected to an existing building 1 and reinforced by earthquake resistance. In addition,
Although the longitudinal direction has been described as the weak axis direction of the building, the weak axis direction is not limited to the longitudinal direction but may be a direction crossing the longitudinal direction, and may be four turns in some cases. The existing building 1 is a building having an RC frame structure having a shape with relatively few irregularities and having room on the surrounding site.

As shown in FIG. 3, the reinforcing frame 2 is a rigid-frame building in which columns 3 and beams 4 made of precast concrete are rigidly connected on site, and is an independent foundation separate from the foundation of the existing building 1. It has a part 5. Also, if necessary, the length of the front and rear reinforcing frames 2 is formed to be longer than the width of the existing building 1 so as to protrude from one end of the existing building 1 in the longitudinal direction, and the space between the protruding portions of the existing building 1 The first extension portions 6 are arranged side by side, and the reinforcing frame 2 is joined to the front and rear surfaces of the first extension portion 6.

Further, a second extension 7 is installed on one side in the longitudinal direction of the existing building 1 outside the front reinforcement frame 2, and the back surface of the second extension 7 is joined to the reinforcement frame 2. May be performed. As a result, the first extension part 6 and the second extension part 7 are integrally joined to the existing building 1 via the reinforcing frame 2.

The columns 3 and the beams 4 of the reinforcing frame 2 are arranged along the existing columns 8 and the existing beams 9 of the existing building 1, respectively. That is, the reinforcing frame 2 is arranged at a position leaving at least a part of the opening of the existing building 1. Main bars 13 and 14 project from both ends of the pillar 3 and the beam 4, and connecting bars 18 each having one end welded to the main bar 14 of the beam 4 project from the inner surface of the beam 4. The columns 3 and the beams 4 of the reinforcing frame 2 are appropriately adjusted with respect to the number of the existing columns 8 and the existing beams 9 facing the mounting surface of the reinforcing frame 2 of the existing building 1 from the viewpoint of earthquake resistance and design. Can be increased or decreased.

When the first extension 6 is not provided,
The length of the reinforcing frame 2 is formed substantially the same as the length of the existing building 1. Furthermore, the columns 3 and the beams 4 of the reinforcing frame 2
May be a cast-in-place reinforced concrete structure or a steel frame reinforced concrete structure. In the above description, a rigid frame is used as the reinforcing frame 2, but a concrete structure other than the rigid frame may be used.

Next, a method of reinforcing the building will be described in order. First, as shown on the left side of FIG. 3, the tip of the slab 10 protruding from the outer wall of the existing building 1 as a veranda or an eave is shaved to expose the reinforcing bar of the slab 10.
Next, a foundation pile 11 is driven outside the mounting surface of the reinforcing frame 2 of the existing building 1, and an underground beam 12 made of precast concrete or cast-in-place concrete is placed on the foundation pile 11.
To form the base 5 of the reinforcing frame 2.

Next, the pillar 3 is placed on the underground beam 12 by the existing pillar 8.
The beam 4 is arranged along the outer side of the existing beam 9 on both sides of the upper end of the column 3. Then, the ends of the beams 4 are opposed to each other with an interval, and the upper and lower columns 3 and the beams 4 on the left and right sides are arranged.
After appropriately arranging reinforcing bars at the joint portion 15, concrete is grouted and the column 3 and the beam 4 are rigidly joined. Further, a formwork is constructed at the connecting portion 16 between the inner side surface of the beam 4 and the shaved slab 10, and inside the formwork, the tip of the connecting streak 18 extends along the longitudinal direction exposing the tip of the slab 10. Slab muscle 1
7 is welded.

Next, the concrete is grouted around the slab bars 17 arranged in the connecting portion 16 to join the slab 10 of the existing building 1 to the reinforcing frame 2. Also,
The beam 4 is a semi-precast member in which a concave groove is formed on the inner surface thereof along the longitudinal direction, and the concave portion is filled with the concrete grouted at the connecting portion 16 so that the reinforcing frame 2 is more firmly attached to the existing building. 1 can also be joined. As shown on the right side of FIG. 3, when the slab 10 does not protrude from the outer wall of the existing building 1, after removing the connecting portion of the existing beam 9, the main reinforcement 14 of the beam 4 of the reinforcing frame 2 is removed.
Is welded to the beam main reinforcement 19 of the existing beam 9, and then the concrete is grouted to the removed portion to join the existing building 1 and the reinforcing frame 2.

[0017]

According to the structure of the first aspect, most of the construction can be performed outside the existing building, so that the room can be used even during the reinforcement work. Further, since the reinforcing frame is arranged at a position leaving at least a part of each opening of the existing building, there is no possibility that the flow line is changed and the usability is deteriorated, and there is no obstacle to lighting and ventilation.

Furthermore, since the reinforcing frame is attached to the outer surface of the existing building, the building can be revived as a new design, and the stress due to an earthquake or the like is dispersed throughout the reinforcing frame, and the existing building and the reinforcing frame are connected to each other. Construction of the joint is easy and the cost is low. In addition, since the reinforcing frame has an independent foundation, there is no concern that the load on the foundation of the existing building will increase, so that the deformation of the existing building can be prevented, and the reinforcing frame does not float or sink.

According to the configuration of the third aspect, since the number of constructions on site is reduced, the construction period is shortened and the construction cost is reduced.

[Brief description of the drawings]

FIG. 1 is a perspective view of a reinforced building according to an embodiment of the present invention.

FIG. 2 is an exploded perspective view of the above.

FIG. 3 is a partially broken perspective view of a joint between a reinforcing frame and an existing building.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Existing building 2 Reinforcement frame 3 Pillar 4 Beam 5 Foundation 6 First extension 7 Second extension 8 Existing pillar 9 Existing beam 10 Slab 11 Foundation pile 12 Underground beam 13,14 Main reinforcement 15 Joint 16 Connection Part 17 Slab streaks 18 Connecting streaks 19 Beam main streaks

Continued on the front page (72) Inventor Hiromitsu Iwamoto 1-34-5 Sanno, Ota-ku, Tokyo (72) Inventor Ryuzo Shirae 2-22-405, Saimachi, Higashimatsuyama-shi, Saitama (72) Inventor Masami Tanaka, Sagamihara-shi, Kanagawa Kamizuruma 2087-1 of 504

Claims (3)

[Claims] 1. A reinforcing frame having an independent foundation portion is erected outside at least one side of an existing building at a position leaving at least a part of an opening of the existing building,
A method for reinforcing a building, comprising joining the reinforcing frame and the existing building. 2. A reinforcing frame having an RC frame structure, a reinforcing bar is arranged between the reinforcing frame and an existing building, and concrete is poured around the reinforcing bar to form the reinforcing frame and the existing building. The method for reinforcing a building according to claim 1, wherein 3. The method of reinforcing a building according to claim 2, wherein the reinforcing frame comprises a precast concrete member.