JP2014020118A - Outer-equipped reinforcement structure of existing building, and method for reinforcing existing building - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an outer-equipped reinforcement structure of an existing building, capable of aseismatically reinforcing an existing in-service building from the outside and capable of being constructed at low cost without being restricted by the position of a column-beam frame of the existing building, and a method for reinforcing the existing building.SOLUTION: An outer-equipped reinforcement structure 1 of an existing building 30 comprises: horizontal members 31 attached to a periphery of the existing building 30; and a reinforcement frame 10 installed on the outside the periphery of the existing building 30. The reinforcement frame 10 is constituted of: reinforcement columns 11 penetrating through the horizontal members 31 and arranged; and two stages of reinforcement beams 12 vertically disposed and extended from side faces of the reinforcement columns 11 in the direction orthogonal to the reinforcement columns 11.

Description

  The present invention relates to an external reinforcing structure for an existing building and a method for reinforcing an existing building.

Conventionally, there is a case where a steel brace frame is added outside an existing building as a seismic reinforcement for the existing building.
As a means of joining the steel braced frame to the existing building, post-installed anchors or PC steel materials, etc. are driven into the floor slab or tip beam such as a balcony formed on the outer periphery of the existing building, and the beam of the steel braced frame is fixed to this. It is common to do this. In addition, if there is no floor slab or tip beam on the outer periphery of the existing building, or if the strength is low, add the floor slab or beam to the outer periphery of the existing building via post-installed anchors or PC steel. In some cases, a steel brace frame is joined to this (see Non-Patent Document 1).

However, since the post-installed anchors are driven into the frame structure with noise and vibration, when applied to existing buildings in service, it may be difficult to use the buildings during the construction period, or to the building users. There was a case to give pleasure.
Also, the addition of floor slabs and small beams took time and was an obstacle to shortening the construction period.

  Therefore, as shown in Patent Document 1, the present applicant, as shown in Patent Document 1, reinforces an existing building that reinforces a building in service without greatly affecting the living environment. We propose a reinforcement structure for existing buildings that is configured to transmit a shear force during an earthquake between the frame and the reinforcement frame by forming a notch in the section and joining a reinforcement frame to the notch. ing.

  In addition, as shown in Patent Document 2, the applicant of the present invention has an existing building reinforcement structure that increases the strength of existing beams and improves earthquake resistance by adding additional beams on both sides of the existing beams. is suggesting. In addition, at least one of the upper main bar or the lower main bar is extended through the existing frame.

JP 2010-196270 A Japanese Patent No. 4551182

"External seismic retrofitting manual for existing reinforced concrete buildings-Reinforcement with framed steel braces-" Japan Architecture Disaster Prevention Association, September 2002, pp. 44-46

  Since the reinforcement structure of the existing building of patent document 1 constructs a reinforcement frame on the outer surface of the balcony etc. (horizontal member) away from the column beam frame of the building, the shear force generated between the existing building and the reinforcement frame In order to sufficiently resist the bending moment and transmit stress, it was necessary to increase the cross-sectional size of the horizontal member and increase the amount of reinforcing bars.

Moreover, the reinforcement structure of the existing building of patent document 2 constructs a reinforcement frame in the position corresponding to the structure of the existing building, and uses the post-construction anchor, PC steel material, etc. from the outside and the inside of the building to install the reinforcement frame. The noise, vibration, etc. associated with the reinforcement work are large and difficult to adopt in existing buildings in service.
In addition, since the reinforcement frame is directly integrated with the column beam frame of the existing building, the column height of the reinforcement frame and the span length of the beam are necessarily the same as the length of each member of the column beam frame of the existing building. It was difficult to reduce the frame width and beam size of the frame and reduce the weight, and there was a problem that a large lifting machine was required and the reinforcement work was expensive.
Further, the reinforcing structure provided with the steel brace has a problem of affecting the living environment because it blocks the field of view of the opening of the existing building.

  The present invention solves the above-described problems, and can be seismically reinforced from the outside to an existing building in service, and is not limited to the position of the column beam frame of the existing building, and is inexpensive. It is an object of the present invention to provide an external reinforcing structure for an existing building that can be constructed and a method for reinforcing an existing building.

  In order to solve the above problems, an external reinforcing structure for an existing building according to the present invention includes an existing building including a horizontal member attached to the outer peripheral portion of the existing building and a reinforcing frame installed outside the outer peripheral portion of the existing building. The reinforcing frame comprising: a reinforcing column disposed through the horizontal member; and a reinforcing beam extending from a side surface of the reinforcing column in a direction orthogonal to the reinforcing column. It is characterized by having.

According to such an external reinforcing structure of an existing building, it is possible to share the seismic horizontal force applied in the beam axis direction of the existing building to the reinforcing frame via the horizontal member. Therefore, the reinforcing frame can be arranged without being limited by the positional relationship with the structure (column beam frame) of the existing building. Further, the reinforcing frame can be brought close to the column beam (or wall) of the existing building, and stress transmission is effectively performed.
In addition, since reinforcement is performed outside the building, the influence on the living environment during construction can be minimized.

  Further, by arranging the reinforcing beams in two or three stages, it is possible to reduce the weight of the beam and reduce the weight as compared with the case where the reinforcing beams are arranged in one stage, and a large lifting machine or the like becomes unnecessary. In addition, if the reinforcing beam is arranged in two steps vertically between the upper and lower horizontal members, the reinforcing beam can be arranged so as not to obstruct the view from the inside of the existing building.

  Moreover, the reinforcement method of the existing building of this invention adjoins the penetration part formation process which forms a penetration part in the horizontal member which attaches to the outer peripheral part of the existing building, and the reinforcement pillar installation process which arranges a reinforcement pillar in the said penetration part A horizontal step of horizontally extending a reinforcing beam on the reinforcing column; and a bonding step of bonding the reinforcing column and the horizontal member, wherein either the horizontal step or the bonding step is a previous step. It is characterized by doing.

  According to such a reinforcing method for an existing building, post-installed anchors and extension of the frame structure can be omitted or reduced, and therefore, the workability is excellent. In addition, since work that generates noise and vibration is reduced, the influence on the living environment can be minimized.

  According to the external reinforcing structure of an existing building and the reinforcing method of the existing building of the present invention, the opening of the existing building is not blocked with respect to the building in service, and the position of the column beam frame of the existing building is limited. The existing building can be seismically strengthened from the outside without any cost.

It is a perspective view which shows the external reinforcement structure of the existing building which concerns on embodiment of this invention. It is a front view which shows a part of external reinforcement structure of the existing building shown in FIG. It is sectional drawing which shows a part of external reinforcement structure of the existing building shown in FIG. (A) And (b) is sectional drawing showing each construction step of the reinforcement method of the existing building which concerns on embodiment of this invention. (A) And (b) is sectional drawing showing each construction step of the reinforcement method of the existing building following FIG.

  As shown in FIG. 1, the external reinforcing structure 1 for an existing building according to the present embodiment includes a horizontal member 31 that is attached to the outer periphery of the existing building 30 and a reinforcing frame 10 that is installed outside the existing building 30. .

  The reinforcing frame 10 includes a reinforcing column 11 disposed through the horizontal member 31 and a reinforcing beam 12 extending from a side surface of the reinforcing column 11 in a direction orthogonal to the reinforcing column 11. .

  The reinforcing frame 10 is formed with two upper and lower reinforcing beams 12 for each floor (between the upper and lower horizontal members 31, 31), and is formed by the left and right reinforcing columns 11, 11 and the upper and lower reinforcing beams 12, 12. Has been.

The reinforcing frame 10 is formed adjacent to the outer wall surface or the window frame on the balcony of each floor of the existing building 30.
Although the material which comprises the reinforcement frame 10 (the reinforcement pillar 11 and the reinforcement beam 12) is not limited, In this embodiment, it is formed with the H-section steel.

  The reinforcing frame 10 of the present embodiment is formed by connecting cross-shaped frame members 13a and 13b (reinforcing frames 13) formed by reinforcing columns and reinforcing beams adjacent vertically and horizontally.

  As shown in FIG. 2, the reinforcing frame 13 is formed by integrally combining a column member 11a and a beam member 12a. The method for fixing the beam member 12a to the column member 11a is not limited.

  The reinforcing frame 13 is formed by extending the beam member 12a from the upper and lower portions of the left and right side surfaces of the column member 11a in a direction orthogonal to the column member 11a, and has a K-shape when viewed from the front. Yes. In the present embodiment, the reinforcement frame 13 is configured by combining cross-shaped frame members 13a and 13b vertically. Note that the configuration of the reinforcing frame 13 is not limited. For example, the column member 11a and the beam member 12a may be integrally formed in advance so as to have a square shape when viewed from the front, or the column member 11a. And the beam member 12a may be joined locally.

  The reinforcing column 11 is formed by connecting the column members 11a arranged up and down, and as shown in FIG. 2 or FIG. 3, penetrates the horizontal member 31 projecting outside the existing building 30. Yes.

  The column member 11a (reinforcing frame 13) passes through a through hole (penetrating portion) 32 formed in the horizontal member 31, and is vertically moved in an intermediate portion of each floor (between the upper and lower horizontal members 31, 31). The other pillar member 11a (reinforcing frame 13) is connected. In addition, the connection position of the column members 11a is not limited.

  The upper and lower column members 11a are fixed to each other by joining the webs via the splice plate 14 with the end surfaces of the column members 11a being in contact with each other.

  In other words, the web of the pillar member 11a is sandwiched from the front and rear by a pair of front and rear splice plates 14, 14 disposed so as to straddle the boundary between the upper and lower pillar members 11a, and fastened by bolts penetrating the splice plate 14 and the web. It is fixed by.

A reinforcing plate 11 b is disposed on the reinforcing column 11 so as to correspond to the intermediate portion in the height direction of the through hole 32.
The reinforcing plate 11b is horizontally disposed so as to partition the space surrounded by the flange of the reinforcing column 11 and the web. The reinforcing plate 11b may be disposed as necessary and may be omitted.

  The reinforcing pillar 11 is joined to the horizontal member 31 through the joining member 20 inside the through hole 32.

The joining member 20 is disposed in the through hole 32 and is in contact with the reinforcing column 11. A gap between the joining member 20 and the through hole 32 is filled with a solidifying material 40.
The joining member 20 is welded to a reinforcing bar arranged on the horizontal member 31 (see FIG. 5A). The reinforcing column 11 is joined to the reinforcing bar of the horizontal member 31 via the joining member 20.

  The reinforcing beam 12 is formed by connecting the beam members 12a arranged on the left and right sides, and as shown in FIG. 2, the upper and lower portions of the reinforcing column 11 on each floor (between the upper and lower horizontal members 31). It extends from each of the left and right.

  The beam member 12 a extends from the side surface of the column member 11 a penetrating the horizontal member 31 in a direction orthogonal to the reinforcing column 11.

The beam members 12a adjacent to each other on the left and right are connected to each other by joining the webs of the beam members 12a via the splice plate 14 with the end surfaces of the beam members 12a being in contact with each other.
That is, when the web is sandwiched from the front and rear by a pair of front and rear splice plates 14 arranged so as to straddle the boundary between the left and right beam members 12a, and the web members 12a are fastened by bolts penetrating the splice plate 14 and the web. Connected.

  In the present embodiment, as shown in FIG. 1, the joining positions of the beam members 12 a adjacent to the left and right are positions where the bending moment acting on the reinforcing beam 12 is small (positions between the left and right reinforcing columns 11, 11. ). In addition, the joining location of the beam members 12a is not limited.

  As shown in FIG. 2, the upper and lower reinforcing beams 12, 12 can be set to positions (levels) where the view from the room is not blocked.

As shown in FIG. 3, the horizontal member 31 constitutes a part of the frame structure of the existing building 30 and is integrally connected to the pillar 33 and the beam 34.
The horizontal member 31 of the present embodiment constitutes a floor portion of a balcony formed outside the existing building 30.

The horizontal member 31 is formed with a through hole 32 for arranging the reinforcing pillar 11.
The through hole 32 has a shape larger than the cross-sectional shape of the reinforcing column 11. In the present embodiment, the through hole 32 is formed in a rectangular shape, but the shape of the through hole 32 may be, for example, a circle and is not limited.

  A gap between the through hole 32 and the reinforcing column 11 is filled with the joining member 20 and the solidifying material 40. Although the material which comprises the solidification material 40 is not limited, In this embodiment, a non-shrink mortar is used.

Next, the reinforcement method of the existing building of this embodiment is demonstrated.
The reinforcement method of the existing building is provided with the penetration part formation process, the reinforcement pillar installation process, the horizontal mounting process, and the joining process.

  The through portion forming step is a step of forming a through hole (through portion) 32 in the horizontal member 31 as shown in FIG. The reinforcing bar 31 a of the horizontal member 31 is exposed in the through hole 32.

The reinforcing column installation step is a step of penetrating the column member 11 a (the reinforcing column 11) through the through hole 32.
The column member 11a is joined to the existing column member 11a disposed in advance in the lower side thereof.

  In the present embodiment, cross-shaped frame members 13a and 13b formed by joining two beam members 12a and 12a to one column member 11a are formed in advance in a factory or the like, and are carried to the site.

  In the reinforcing column installation step, as shown in FIG. 4B, first, the lower frame member 13 a is joined to the existing reinforcing frame 13 while the column member 11 a is passed through the through hole 32. Next, as shown in FIG. 5A, the upper frame member 13b is connected to the lower frame member 13a to form a K-shaped reinforcing frame 13.

  The lower frame member 13a and the upper frame member 13b are connected by welding. In addition, the connection method of frame member 13a, 13b is not limited.

The horizontal mounting process is a process in which the reinforcing beam 12 is horizontally mounted between the adjacent reinforcing columns 11.
In the horizontal mounting process, the beam members 12a of the reinforcing frames 13 adjacent to each other on the left and right may be connected.

  The joining step is a step of joining the reinforcing pillar 11 (the pillar member 11a) and the horizontal member 31 as shown in FIG.

First, in the through hole 32, the joining member 20 is welded to the reinforcing bar 31 a of the horizontal member 31. The joining member 20 is brought into contact with the side surface of the reinforcing column 11.
Next, as shown in FIG. 5B, the reinforcing pillar 11 and the horizontal member 31 are joined by filling the gap between the joining member 20 and the through hole 32 with the solidifying material 40.

According to the external reinforcement structure 1 of the present embodiment, the following effects are exhibited.
The seismic performance is improved by sharing the seismic horizontal force applied in the beam axis direction of the existing building 30 to the reinforcing frame 10 via the horizontal member 31. In addition, since the stress is transmitted through the horizontal member 31, the reinforcing frame 10 can be arranged without being limited by the positional relationship with the column beam frame (structure) of the existing building 30.

Further, the reinforcing frame 10 can be brought close to the pillars 33 and the beams 34 (or walls) of the existing building 30 of the horizontal member 31, and stress transmission is effectively performed.
That is, the position of the reinforcing frame 10 can be set relatively freely regardless of the length of the overhanging length of the horizontal member 31, so that even if the overhanging length of the horizontal member 31 is large, the column of the existing building 30 33 or the beam 34 (or wall).

The arrangement of the reinforcing pillars 11 is not limited to the position of the existing beams 34 and can be set freely. Therefore, it is possible to arrange the reinforcing pillars 11 more than the existing pillars 33. If the number of the reinforcing pillars 11 is increased, the burden per reinforcing pillar 11 can be reduced, and consequently the burden on the joint portion with the horizontal member 31 can be reduced. Therefore, it is not necessary to add a structure with the reinforcement frame 10 being arranged.
Further, by increasing the number of the reinforcing pillars 11, the cross section of the reinforcing pillar 11 can be reduced, and as a result, the weight of the reinforcing frame 10 can be reduced.

  Since reinforcement is performed outside the existing building 30, the influence on the living environment during construction can be minimized.

  Since the reinforcing bars 31 a arranged in the horizontal member 31 and the reinforcing column 11 are joined via the joining member 20, the stress transmission performance between the reinforcing column 11 and the horizontal member 31 is high.

Since the reinforcing beams 12 are arranged in two stages on each floor, it is possible to reduce the size of the reinforcing beams 12, and as a result, it is possible to reduce the weight of the reinforcing frame 10.
Further, by adjusting the height of the reinforcing beams 12 arranged in the upper and lower two stages on each floor, the beam length of the reinforcing beams 12 can be reduced as compared with the one-stage beam. Further, the reinforcing beam 12 can be arranged so as not to obstruct the view from the inside of the existing building 30.

  Further, since the reinforcing frame 10 is constructed without using a post-construction anchor, it is not necessary to drive the post-construction anchor into the pillar 33 or the beam 34 and is excellent in workability, and noise and vibration accompanying construction. Etc. can be minimized.

  Further, since the beam members 12a are joined at a position where the bending moment at the intermediate portion between the reinforcing columns 11 is minimized, the joint between the beam members 12a does not become a weak point.

  Moreover, since it is comprised so that the shearing force at the time of an earthquake may mutually be transmitted between the reinforcement frame 10 and the existing building 30, a desired reinforcement effect is securable.

Further, the external reinforcing structure 1 can be employed in any building having the horizontal member 31.
Furthermore, since it is possible to perform construction while using the existing building 30, it is difficult for the construction to be restricted in terms of time and time, so that short-term construction is possible as a whole, and costs can be reduced.

  Since a reinforcing effect can be obtained without arranging braces, the aesthetics are excellent, and the lighting and ventilation are not impaired.

As mentioned above, although embodiment which concerns on this invention was described, this invention is not restricted to the said embodiment, In the range which does not deviate from the meaning of this invention, it can change suitably.
For example, in the above-described embodiment, the case where the joining member is disposed between the reinforcing column and the horizontal member has been described. However, the joining member is not necessarily disposed. Moreover, the joining member does not necessarily need to be welded to the reinforcing bar of the horizontal member.

  In the above-described embodiment, the case where the reinforcing beams are arranged in two stages for each floor has been described. However, the number of reinforcing beams is not limited, and may be arranged in three stages, for example.

  Although the said embodiment demonstrated the case where a reinforcement frame is arrange | positioned in the part which comprises the floor part of the balcony of a horizontal member, the installation location of a reinforcement frame is not limited. For example, the reinforcing frame may be arranged on the horizontal member in the room.

  Moreover, although the said embodiment demonstrated the case where a reinforcement frame was comprised with a steel frame structure, the structure of a reinforcement frame is not limited to a steel frame structure, For example, even if one part or all is comprised with a reinforced concrete structure. Good.

  In the embodiment, the case where the joining step is performed after the horizontal step is performed has been described. However, the joining step may be performed before the horizontal step. That is, the reinforcing column and the horizontal member may be joined before the reinforcing beam is horizontally mounted. In addition, the upper and lower frame members may be joined after the lower frame member is joined to the horizontal member (after the joining member is disposed).

  In the above-described embodiment, the case where the reinforcing frame is formed by joining the cross-shaped frame members arranged above and below is described, but the method of forming the reinforcing frame is not limited. For example, the reinforcing frame may be formed by passing a column member through the penetrating portion and then joining a beam member to the column member. Further, a reinforcing frame previously formed in a letter shape may be provided.

DESCRIPTION OF SYMBOLS 1 External reinforcement structure 10 Reinforcement frame 11 Reinforcement pillar 12 Reinforcement beam 20 Joining member 30 Existing building 31 Horizontal member 31a Reinforcing bar 32 Through-hole
40 Solidification material

Claims (3)

An external reinforcement structure for an existing building comprising a horizontal member attached to the outer periphery of the existing building, and a reinforcing frame installed outside the outer periphery of the existing building,
The reinforcing frame includes a reinforcing column disposed through the horizontal member, and a reinforcing beam extending from a side surface of the reinforcing column in a direction orthogonal to the reinforcing column. External reinforcement structure for existing buildings.   2. The external reinforcing structure for an existing building according to claim 1, wherein the reinforcing beams are arranged in two or three steps up and down between the upper and lower horizontal members. A penetrating part forming step for forming a penetrating part in a horizontal member attached to the outer periphery of an existing building;
A reinforcing column installation step of arranging a reinforcing column in the penetrating portion;
A horizontal step of horizontally extending a reinforcing beam to the adjacent reinforcing columns;
A joining step for joining the reinforcing pillar and the horizontal member,
One of the horizontal mounting step and the joining step is a pre-process, and the method for reinforcing an existing building.

Images