JP2017061811A - Seismic reinforcement method of building - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a seismic reinforcement method of a building capable of largely saving field-work.SOLUTION: There is provided a seismic reinforcement method of a building which includes the steps of: forming a brace unit 5 by connecting the upper ends of a pair of reinforcement braces 1 which are disposed in inverted V-shape to an upper steel beam 2; disposing the brace unit 5 in a frame between a pair of pillars 6; joining both ends of the upper steel beam 2 to the pillar 6 with bolts; and joining the lower ends of the pair of reinforcement braces 1 to a lower beam 8 and/or the pillar 6.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a seismic reinforcement method for increasing the earthquake resistance (vibration resistance) of a building that is installed on a building surface.

  Conventionally, as a measure for increasing the seismic strength of a building, that is, in order to impart vibration control performance to the building, a method of installing a reinforcing brace in the building frame is often used.

  In addition, a reinforcing brace with a frame is arranged in a frame space formed by a pair of side-by-side concrete columns and a pair of upper and lower concrete beams, and the outer peripheral surface of the frame body of the reinforcing brace with frame, the concrete columns, and the upper and lower concrete beams The mortar is filled between the frames, the framed reinforcing brace is supported and fixed at a predetermined position in the frame through the hardened mortar, and the stress from the concrete frame is effectively transmitted to the reinforcing brace. There are some (see, for example, Patent Document 1).

JP 2004-21113 A

  However, in the conventional building seismic strengthening structure (building seismic strengthening method), the larger the brace material, the greater the number of bolts and rows of the reinforcing brace joints. It takes a lot of time to ensure accuracy. In particular, when it is necessary to reduce work on site, it is a problem in process planning to ensure the accuracy of construction.

  In view of the above circumstances, an object of the present invention is to provide a seismic reinforcement method for a building that can greatly reduce work on site.

  In order to achieve the above object, the present invention provides the following means.

  The seismic reinforcement method for a building of the present invention includes a brace unit forming step of forming a brace unit by connecting upper ends of a pair of reinforcing braces arranged in an inverted V shape to an upper steel beam, and a pair of the brace units. A brace unit joining step that is arranged in a frame between the columns, and that both ends of the upper steel beam are bolted to the columns, and the lower ends of the pair of reinforcing braces are joined to the lower beams and / or columns. It is characterized by providing.

  Moreover, the seismic reinforcement method for a building according to the present invention is a frame in which the upper ends of a pair of reinforcing braces arranged in an inverted V shape are connected to the upper steel beam, and a cross member is connected to the lower ends of the pair of vertical members. A brace unit that forms a brace unit by connecting upper ends of the pair of longitudinal members to both ends of the upper steel beam, and connecting lower ends of the pair of reinforcing braces to the frame member, respectively. And a bracing unit joining step in which the brace unit is disposed in a pair of frame surfaces, both ends of the upper steel beam are bolted to the column, and the cross member is joined to the lower beam. It is a feature.

  In the seismic reinforcement method for a building according to the present invention, a brace unit in which an upper steel beam and a reinforcing brace are unitized in advance is arranged in the frame of the building, and both ends of the upper steel beam are bolted to columns respectively. Thus, the reinforcing brace can be accurately arranged at a predetermined position.

  As a result, it is possible to improve the construction accuracy of the reinforcing brace and prevent the occurrence of inconveniences such as deformation of the plate due to the bolt hole alignment, as compared with the conventional case where the reinforcing brace is arranged at a predetermined position and bolted. it can.

  Further, since the reinforcing brace can be efficiently installed, it is possible to reduce the cost by reducing the labor cost at the site, and it is also possible to reduce the number of stiffening members and omit the stiffening members.

  Furthermore, the construction period can be shortened by labor saving on-site labor, and safety can be improved by labor saving on-site labor.

It is a figure which shows the earthquake-proof reinforcement structure (the earthquake-proof reinforcement construction method of a building) of the building which concerns on one Embodiment of this invention.

  Hereinafter, with reference to FIG. 1, the earthquake-proof reinforcement method of the building which concerns on one Embodiment of this invention is demonstrated.

  First, the present embodiment relates to a seismic strengthening method (seismic strengthening structure) for improving a seismic performance of a building by installing a reinforcing brace in a frame surface between columns and beams of the building.

  Specifically, first, the seismic reinforcement structure A of the building according to the present embodiment includes a pair of substantially V-shaped reinforcement braces (steel brace / mountain brace) 1 and an upper beam member of a steel frame as shown in FIG. (Upper steel frame material) 2 and a frame material 3 of a steel frame material such as H-shaped steel.

  And in the earthquake-proof reinforcement method (building earthquake-proof reinforcement structure A) of the building of this embodiment, each upper end part of a pair of reinforcement braces 1 is connected to a predetermined position of the upper beam member 2 of the steel frame by bolting or the like in advance. The upper beam member 2 and the pair of reinforcing braces 1 are integrated into a unit.

  Further, in the present embodiment, the upper ends are joined to the both ends of the upper beam member 2 by welding or the like, a pair of longitudinal members 3a are provided, and further welded to the lower end portions of the pair of longitudinal members 3a. The material 3b is connected to the pair of vertical members 3a. Thereby, the frame 3 which consists of a pair of vertical member 3a and cross member 3b is integrally joined to the upper beam member 2. Further, a gusset plate 4 is provided at a joint portion between the vertical members 3 a and the horizontal members 3 b of the frame 3, and the lower end side of each reinforcing brace 1 is bolted to the gusset plate 4.

  Thus, in this embodiment, in addition to the upper beam member 2 and the pair of reinforcing braces 1, the frame body 3 is integrally provided to form the brace unit 5 in advance (brace unit forming step).

  Then, the brace unit 5 formed as described above is disposed at a predetermined position on the building surface of the building using a lifting machine such as a crane.

In addition, the brace unit 5 is disposed at a predetermined position, and both end portions of the upper beam member 2 are respectively bolted to the columns 6. Further, the floor concrete 7 is placed, and the cross member 3b of the frame 3 is integrated with the lower beam material (lower beam) 8 (brace unit joining step).
Thereby, the mountain-shaped reinforcement brace 1 can be installed in the frame of the building.

  In addition, the upper beam material 2 is made into a column beam joint part and a field bolt joint at both ends, and is designed in consideration of axial force transmission. Moreover, after installing the frame steel frame (cross member 3b) so that the stud 9 on the lower beam 8 may be covered with the weak shaft, the floor concrete 7 is placed. At this time, by providing a plurality of through holes in the web of the cross member 3b, it is surely integrated with the floor concrete 7 so that the shearing force is suitably transmitted.

  Further, the frame steel frame (vertical member 3a) does not transmit force directly to the main body. In other words, the vertical member 3a may have a temporary function as a ruler of the reinforcing brace 1 for the sake of simplicity. Therefore, in this case, since all horizontal force from the reinforcing brace 1 is borne by the horizontal member, design considerations such as a vertical slit wall of RC are necessary.

  Therefore, in the seismic reinforcement method (building seismic reinforcement structure A) of the building of this embodiment, the brace unit 5 in which the upper beam material 2 and the reinforcing brace 1 are unitized is disposed in the building frame. By bolting both ends of the upper beam member 2 to the pillars 6, the reinforcing brace 1 can be accurately arranged at a predetermined position.

  This makes it possible to improve the construction accuracy of the reinforcing brace 1 and to cause inconveniences such as plate deformation due to bolt hole alignment, as compared with the conventional case where the reinforcing brace 1 is disposed at a predetermined position and bolted. Can be avoided.

  In addition, since the reinforcing brace 1 can be installed efficiently, it is possible to reduce costs by reducing labor costs at the site, and it is possible to reduce the number of the stiffening members 10 and omit the stiffening members.

  Furthermore, the construction period can be shortened by labor saving on-site labor, and safety can be improved by labor saving on-site labor.

  In addition, since it is easy to provide the stiffening member 10 at the factory, a reduction in the number of steel frames can be expected by effectively utilizing the brace cross section of the stiffening member 10.

  As mentioned above, although one embodiment of the earthquake-proof reinforcement method of the building concerning the present invention was described, the present invention is not limited to the above-mentioned one embodiment, and can be suitably changed in the range which does not deviate from the meaning.

  For example, the brace unit 5 may be formed in a substantially K shape by the upper steel beam 2 and the pair of reinforcing braces 1. In this case, the brace unit 5 is installed in the frame surface, both ends of the upper steel beam 2 are bolted to the column 6, and then the lower end of the reinforcing brace 1 is attached to the lower beam 8 and / or using appropriate means. What is necessary is just to connect to the pillar 6. And even if comprised in this way, it is possible to obtain the effect similar to this embodiment.

1 Reinforced brace (steel brace)
2 Upper beam material (upper steel beam)
3 Frame 3a Vertical member 3b Cross member 4 Gusset plate 5 Brace unit 6 Column 7 Floor concrete 8 Lower beam 9 Stud 10 Stiffening member A Seismic reinforcement structure

Claims (2)

A brace unit forming step of forming a brace unit by connecting upper ends of a pair of reinforcing braces arranged in an inverted V shape to an upper steel beam;
The brace unit is disposed in a frame surface between a pair of columns, both ends of the upper steel beam are bolted to the columns, and the lower ends of the pair of reinforcing braces are used as a lower beam and / or a column. A seismic reinforcement method for buildings characterized by comprising a bracing unit joining step for joining. The upper end of a pair of reinforcing braces arranged in an inverted V shape is connected to the upper steel beam, and a frame member in which a cross member is connected to the lower end of the pair of longitudinal members is connected to the upper end of the pair of longitudinal members. A brace unit forming step of connecting to both ends of the upper steel beam and connecting a lower end of the pair of reinforcing braces to the frame member to form a brace unit;
A brace unit joining step of arranging the brace unit in a pair of frame surfaces, bolting both ends of the upper steel beam to the pillar, and joining the cross member to the lower beam; Seismic reinforcement method for buildings.

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