JP2017008684A - Aseismatic reinforcement method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an aseismatic reinforcement method utilizing a framed brace of a constant size and compatible with diverse height dimensions of an opening, without impairing the exterior design.SOLUTION: An aseismatic reinforcement method includes the following steps for: arranging a framed aseismatic reinforcing body 12 on outside of a plurality of openings 22 of a column-beam frame 20 of an existing building 14, the framed aseismatic reinforcing body being without a bolt connecting part on a surface; arranging a reinforcing bar 28 on an outer surface of the beam of the column-beam frame 20; surrounding the reinforcing bar 28 with a concrete mold 46, for partitioning an additional concrete placement space 58 for the beam; and forming a beam reinforcement part 32 by additional concrete placement by filling a filler in the additional concrete placement space 58 for the beam, and fixing the framed aseismatic reinforcing body 12 on the beam reinforcement part 32 by additional concrete placement.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a seismic reinforcement method.

When earthquake-proofing an existing building, a method of reinforcing the opening of the column beam frame with a framed brace from the outside of the building is widely adopted. At this time, generally, a brace with a frame is bolted on site due to restrictions on construction conditions such as transportation. For this reason, the bolt joint part of the brace surface can be seen from the outside of the building, and improvement has been desired from the viewpoint of the exterior design of the building.
As a method for attaching the brace with a frame so as not to show the bolt joint portion, for example, there is a method of welding and joining the joint portion of the brace with a frame on site. However, with this method, welding work increases and the construction period becomes longer.
In order to shorten the construction period, a method of transporting an integrated framed brace to the site and attaching it to the opening of a column beam frame in an existing building is being studied.
For example, Patent Literature 1 discloses a technique for seismically reinforcing an existing building with a framed brace.

  In Patent Document 1, a brace with a frame in which a brace and a frame material are integrated is fitted into the inner peripheral surface of an opening section defined by a column and a beam of an existing building together with the frame, and the inner side from the side of the column and the beam. This is a technology that joins a brace with a frame to a column and a beam with an anchor bar protruding to the side.

JP2013-221331A

However, since Patent Document 1 is configured to fit the frame brace together with the frame body on the inner peripheral surface of the opening, in the case of a building having an opening having a different height, a framed brace having a different size is used. , Each need to be prepared. That is, various assortments of framed braces are required.
Also, if the size of the framed brace is too large, the framed brace may not be transported by truck due to dimensional restrictions during transportation.

  In view of the above-described facts, an object of the present invention is to provide a seismic reinforcement method that can be attached to openings of various heights with a framed brace of a certain size and that improves the appearance design.

  A method for seismic reinforcement according to claim 1 comprises a step of disposing a seismic reinforcing body with a frame having no bolt joints on the outside of a plurality of openings of a column beam frame of an existing building; A step of arranging reinforcing reinforcing bars on the outer surface of the beam of the frame, a step of surrounding the reinforcing reinforcing bars with a formwork and partitioning the beam additional space, and filling the beam additional space with a filler, and a beam additional reinforcing portion And fixing the frame-equipped seismic reinforcement body to the beam-strike reinforcement portion.

According to the first aspect of the present invention, the framed seismic reinforcement without bolt joints is arranged outside the plurality of openings of the column beam frame of the existing building. In addition, a reinforcing reinforcing bar is attached to the beam additional space on the outer surface of the beam, and the additional beam reinforcing portion is formed by a filling material filled in a mold surrounding the reinforcing reinforcing bar.
As a result, the column beam structure of the existing building is seismically reinforced at the beam reinforcement section, and the framed seismic reinforcement is fixed to the beam reinforcement section. In addition, since the existing building is seismically reinforced with a framed seismic reinforcement body having no bolt joints on the surface, the appearance design of the seismically reinforced building can be improved as compared with conventional reinforcement methods.

The invention according to claim 2 is the seismic reinforcement method according to claim 1, wherein the plurality of seismic reinforcement bodies with frames are all formed at the same height, and the upper surface position of the beam-strike reinforcement portion is adjusted. And the said earthquake-proof reinforcement body with a frame is being fixed to the said beam reinforcement hitting reinforcement part.

According to the second aspect of the present invention, the plurality of framed seismic reinforcement members are all formed at the same height. And even if there are openings with different heights from other openings in the plurality of openings, adjusting the upper surface position of the beam additional reinforcement part makes it possible to add seismic reinforcement with a frame to the beam additional reinforcement part. The body can be fixed.
Thereby, it can respond to the various height of an opening part with the seismic reinforcement body with a frame of a fixed size.

  The invention according to claim 3 is the seismic reinforcement method according to claim 1 or 2, wherein the lower surface of the upper seismic reinforcement body with the frame and the upper surface of the lower seismic reinforcement body with the frame are formed of the beam. It is connected to a connecting member fixed to the outer surface.

According to the invention of claim 3, with the connecting member fixed to the outer surface of the beam, the lower surface of the upper frame seismic reinforcing body and the upper surface of the lower frame seismic reinforcing body are connected, Fixed to the outer surface of the beam.
As a result, a plurality of framed seismic reinforcing bodies can be attached to the outer wall of the building, and thereafter, the space between the framed seismic reinforcing bodies can be increased and reinforced. That is, since the process of attaching the seismic reinforcement with frame and the process of reinforcing the beam can be separated, the workability can be improved.

  Since the present invention is configured as described above, it is possible to provide a seismic reinforcement method that can be attached to openings of various heights with a frame-sized brace of a certain size and improve the appearance design.

It is a front view which shows the construction process by the earthquake-proof reinforcement method which concerns on embodiment of this invention. (A) is a front view which shows the column beam frame which concerns on embodiment of this invention, (B) is Z1-Z1 sectional view taken on the line of FIG. 2 (A). It is the X1-X1 sectional view taken on the line of FIG. 2 (A) which shows the column beam frame which concerns on embodiment of this invention. (A) is a front view which shows the construction step of the seismic reinforcement method which concerns on embodiment of this invention, (B) is Z1-Z1 sectional view taken on the line of FIG. 4 (A). It is the X1-X1 sectional view taken on the line of FIG. 4 (A) based on embodiment of this invention. (A) is a front view which shows the construction step of the seismic reinforcement method which concerns on embodiment of this invention, (B) is Z1-Z1 sectional view taken on the line of FIG. 6 (A). It is the X2-X2 sectional view taken on the line of FIG. 1 (A) based on embodiment of this invention. (A) is a front view which shows the construction step of the seismic reinforcement method which concerns on embodiment of this invention, (B) is Z1-Z1 sectional view taken on the line of FIG. 8 (A). It is the X3-X3 sectional view taken on the line of FIG. 8 which shows the construction process by the earthquake-proof reinforcement method which concerns on embodiment of this invention.

The earthquake-proof reinforcement method according to the embodiment of the present invention will be described with reference to FIGS.
Here, FIG. 1 is a front view of the column beam frame 20 of the existing building 14 as viewed from the outside, and shows a plurality of construction steps of the seismic reinforcement body 10 constructed by the seismic reinforcement method in order from the top to the bottom. Yes.
2A, 2B, and 3 show the basic configuration of the column beam frame 20. FIG.
FIGS. 4A, 4B, and 5 show a state in which the brace 12 with the frame is attached to the column beam frame 20. FIGS. 6A, 6B, and 7 show the column beam frame 20. FIG. The state which attached the reinforcing steel bar 28 and the brace 12 with a frame is shown.
8 (A), (B), and FIG. 9 show a state in which concrete is placed on the outside of the column beam frame 20 to construct a beam-strike reinforcement portion 32 and the seismic reinforcement body 10 is completed. Yes.

  The construction of the seismic reinforcement 10 by the seismic reinforcement method according to this embodiment will be described below in the order of steps. In the seismic strengthening method, first, a framed brace (framed seismic reinforcing body) 12 having no bolt joints on the surface is disposed outside the plurality of openings 21 of the column beam frame 20 of the existing building 14.

FIG. 1, FIG. 2 (A), (B), and FIG.
The existing building 14 is made of reinforced concrete or steel reinforced concrete, and has a plurality of floors. The column beam frame 20 is a column beam frame on the outer periphery of the existing building 14.
The column beam frame 20 includes an existing column 16 and an existing beam 17. In the beam 17, a wall body 19 is constructed at a predetermined height above and below the beam 17, and the beam 17 and the wall body 19 constitute an outer wall structure 18. The wall body 19 is provided outside the building of the beam 17.

  2A, 2B, and 3 show the opening 21 that the seismic reinforcement 10 reinforces. The opening 21 is a space formed between adjacent columns 16 (internal dimension W1) and between the upper and lower beams 17 (internal dimension H3). By seismically reinforcing the opening 21, the seismic strength of the column beam frame 20 can be increased.

Further, a window opening 22 is provided between the upper and lower outer wall structures 18 with an internal dimension H1. The window opening 22 is an opening smaller than the opening 21 (H3> H1), and a window member (not shown) is attached between the upper and lower wall bodies 19.
The column beam frame 20 of the existing building 14 has a configuration in which the outer surface 16F of the column 16 protrudes from the outer surface 18F of the outer wall structure 18 by a distance Y1 in plan view (see FIG. 2B).

As shown in the construction process of FIG. 1, the seismic reinforcement 10 is a recess (step) formed by the side surface 16S of the existing column 16 built with the inner dimension W1 and the outer surface 18F of the outer wall structure 18. Part) is used to fill the recess.
In FIG. 1, only a part of the seismic reinforcement 10 is displayed. The seismic reinforcement 10 is constructed from the lowermost part to the uppermost floor of the existing building 14 in the height direction as needed, and is built around the existing building 14 in the lateral direction.

The seismic reinforcement 10 includes a framed brace 12 and a beam-strike reinforcement portion 32 described later.
FIGS. 1, 4 </ b> A, and 4 </ b> B show the appearance of the brace 12 with frame and the state of attachment to the column beam frame 20.

The brace 12 with a frame has a configuration in which a pair of braces (seismic elements) 24 are attached to an inner peripheral surface of a rectangular frame body (vertical frame member 26V, horizontal frame member 26H) 26.
The frame body 26 is made of steel, and the height H2 is larger than the height H1 of the window opening 22, and the width W2 is formed with an outer dimension smaller than the internal dimension W1 of the window opening 22.

  The braces 24 are made of steel, and a pair of braces 24 are fixed obliquely to the inner peripheral surface of the frame body 26. The brace 24 is fixed to the frame body 26 without being cut halfway. As a result, no bolt joint is provided on the surface of the brace.

  The brace 12 with a frame is disposed in parallel with the outer surface 18F of the outer wall structure 18 at a position outside the window opening 22 and covering the window opening 22. The brace 12 with a frame secures the view from the window opening 22 as much as possible, and reinforces the opening 21 by earthquake resistance.

The lower ends of the pair of braces 24 are respectively fixed to both corners on the lower side of the frame body 26, and the upper ends are respectively fixed to the central part of the upper horizontal frame member 26H. Thus, a convex triangle is formed by the pair of braces 24 and the lower horizontal frame member 26H.
The fixed shape of the brace 24 is not limited to an upwardly convex triangle, and may be another mounting shape such as a downwardly convex triangle as long as seismic strength can be ensured.

As for the brace 12 with a frame, the center part covers the window opening part 22, and the horizontal frame material 26H of the lower side of the brace 12 with a frame is arrange | positioned in parallel with the outer surface 18F of the existing outer wall structure 18 of the lower side at a distance. The upper lateral frame member 26H is arranged in parallel with the outer surface 18F of the upper existing outer wall structure 18 at a distance.
Further, the vertical frame member 26 </ b> V is disposed in parallel to the side surface 16 </ b> S of the column 16 with a distance W <b> 4 from the side surface 16 </ b> S of the column 16.

That is, the width W2 of the frame body 26 is smaller than the distance W1 between the side surfaces 16S of the adjacent columns 16, and gaps with a distance W4 are provided on both sides between the side surfaces 16S of the columns 16. Further, the height H2 of the frame body 26 is larger than the height (distance between the upper and lower outer wall structures 18) H1 of the window opening 22.
Thereby, the brace 12 with a frame inserts the width direction between the side surfaces 16 </ b> S of the adjacent pillars 16, and sets the height direction to the lower end portion of the upper outer wall structure 18 and the lower outer wall structure 18. It can be overlapped with the upper end (see FIG. 9).

  As a result, even if the height H3 of the opening 21 is different from the other places depending on the location of the existing building 14, the framed brace 12 formed with the same dimension (height H2) The height H1 of the portion 22 can be used to arrange in all the window openings 22. That is, even if the height of the opening 21 is different, the framed brace 12 matched to each height is not required.

The braces 12 with a frame are temporarily fixed by columns (connecting members) 30 in a state where a plurality of the braces 12 with a frame are arranged along the pillars 16 in the height direction.
As shown in FIG. 1 and FIG. 5, the support columns 30 are arranged at two locations in the vertical direction along the pillar 16 between the upper framed brace 12 and the lower framed brace 12.
The support column 30 is formed of a member having high support rigidity such as H-shaped steel, and is fixed in parallel to the outer surface 18F at a position separated from the outer surface 18F of the outer wall structure 18 by a distance Y4.

  The strut 30 is composed of a base plate 60 attached to the beam 17 with an anchor bolt 36 and a gusset plate 62 attached to the strut 30 on the free end side, and a through hole (not shown) is made to coincide with a high strength bolt 64. It is fixed to the beam 17 by joining.

The support column 30 is on the same plane on the Y axis as the framed brace 12, and is provided on an extension line of the vertical frame member 26V of the frame body 26 of the upper framed brace 12 and the lower framed brace 12. ing.
The lower end portion of the upper framed brace 12 and the upper end portion of the lower framed brace 12 are connected to the upper end portion and the lower end portion of the column 30 fixed to the beam 17 with their axes aligned.
Thereby, the brace 12 with a frame is attached to the outer side of the outer wall structure 18.

  Next, reinforcing reinforcing bars 28 are arranged on the outer surface 18F of the beam 17 of the column beam frame 20.

FIG. 1, FIG. 6 (A), (B), and FIG. 7 show a state in which reinforcing reinforcing bars 28 are arranged. FIG. 7 shows a state in which concrete (filler) 34 is placed. The reinforcing reinforcing bars 28 are arranged in a beam increasing space between the outer surface 18F of the beam 17, the lower surface of the framed brace 12 arranged on the upper side, and the upper surface of the framed brace 12 arranged on the lower side. .
The reinforcing reinforcing bars 28 include a main bar 42 in which a plurality of bars are passed in the horizontal direction at a predetermined interval, and a rib bar 44 that is passed in a vertical direction at a predetermined interval and that surrounds and fixes the main bars 42. ing.

  Both end portions of the main bar 42 penetrate the support column 30 in the lateral direction and are passed between the side surfaces 16S of the column 16 (see FIG. 3). Here, the support column 30 has a flange surface parallel to the outer surface 18F of the beam 17, and the web 52 is provided with a plurality of openings 54 in the height direction. That is, since the web 52 is left uncut in the lateral direction, the main reinforcement 42 can arrange the main reinforcement 42 and the stirrup 44 using the web 52 left in the ladder form. Thereby, the efficiency of bar arrangement work can be improved.

A plurality of anchor bolts 38 are embedded in the beam 17, and the reinforcing reinforcing bars 28 are joined to the anchor bolts 38. Further, a fixing line 68 is passed between the lower surface of the framed brace 12 arranged on the upper side and the upper surface of the framed brace 12 arranged on the lower side.
Although illustration is omitted, anchor bolts are embedded in the side surface 16S of the column 16, and a spiral line 66 is arranged between the vertical frame member 26V of the brace 12 with the frame and the side surface 16S of the column 16. The Thereby, joining with brace 12 with a frame and column beam frame 20 can be strengthened more.

  Next, the reinforcing steel bars 28 are surrounded by the molds 46 and 48 to partition the beam addition space.

As shown in FIGS. 1 and 7, the molds 46 and 48 are attached after the reinforcing reinforcing bars 28 are arranged. The formwork 46 is attached to the outside of the reinforcing bar 28, and the formwork 48 is attached to the lower side of the reinforcing bar 28. The surrounding spaces and the beam increasing space 58 are partitioned by the molds 46 and 48.
The molds 46 and 48 are both passed in the lateral direction (X-axis direction) between the side surfaces 16S of the pillars 16. The upper end of the mold 46 is wrapped with the lower surface of the upper framed brace 12, and the lower end of the mold 46 is wrapped with the upper surface of the lower framed brace 12. One end of the mold 48 in the Y-axis direction is wrapped with the bottom surface of the outer wall structure 18, and the other end of the mold 48 is brought into contact with the side surface of the lower brace 12 with the frame. Installed.

  A stud (shear connector) 40 is joined to the upper surface of the horizontal frame member 26H of the lower framed brace 12 and the lower surface of the horizontal frame member 26H of the upper framed brace 12 respectively. The mold frame 46 is provided by partially wrapping the outer side of the horizontal frame member 26H of the frame body 26 so that the stud 40 is embedded in the concrete.

  In addition, when the height of the opening 21 is different from the height H1 of the opening 21 at other positions, the position of the upper surface 32U of the beam striking reinforcement portion 32 is adjusted in the vertical direction to ensure the reinforcing strength. To do. Thereby, if the height of the window opening 22 is smaller than the height H2 of the framed brace 12, the difference in the height of the opening 21 can be absorbed using the framed brace 12 having the same height H2. it can.

  The molds 46 and 48 are also attached to the gap between the column 16 and the vertical frame member 26V. The molds 46 and 48 are applied with force from the outside by a fixing member (not shown) so that the positions of the molds 46 and 48 do not move even when the concrete 34 is cast from the upper placement port. .

  Finally, concrete (filler) 34 is filled in the beam increased hitting space to form the beam increased hitting reinforcing portion 32, and the framed brace 12 is fixed to the beam increased hitting reinforcing portion 32.

  As shown in FIGS. 1, 7, 8 </ b> A, 8 </ b> B, and 9, the beam increasing space surrounded by the molds 46 and 48, the outer surface 18 </ b> F of the outer wall structure 18, and the side surface 16 </ b> S of the column 16. The concrete 34 is driven to 58 to a predetermined height. Thereby, the beam increase reinforcement part 32 in which the concrete 34 was laid is formed. The outer surface 32F of the beam reinforcement member 32 is substantially the same as the outer surface 12U of the framed brace 12.

  As a result, the beam 17 becomes an increased beam 50 reinforced by the beam additional reinforcement portion 32, the existing building 14 is reinforced, and the upper framed brace 12 and the lower framed brace 12 are increased. It is integrated with the striking reinforcement portion 32 and fixed to the existing building 14.

As described above, according to the seismic reinforcement method of the present embodiment, even if the height of the opening 21 is different from the height H3 of the other opening 21, the height of the window opening 22 is high. If the height H1 is smaller than the height dimension H2 of the framed brace 12, a plurality of framed braces 12 formed at the same height can be obtained by adjusting the top end position of the beam-strike reinforcement portion 32. 14 outer wall structures 18 can be integrated.
That is, it is possible to attach the frame braces 12 having a certain size to the window openings 22 having various heights. As a result, it is possible to improve the workability of the seismic reinforcing body 10 and the aesthetic appearance.

Moreover, the brace 12 with a frame can be manufactured at a work place or a factory away from the construction site, and the finished product can be carried into the installation site by a truck or the like. Thereby, the dimensional accuracy of the brace 12 with a frame can be improved, and the work at the field can be reduced.
Further, since the finished frame brace 12 is directly attached to the window opening 22, the bolt joint can be eliminated from the frame brace 12, and the appearance design can be improved.

  Moreover, manufacturing efficiency can be improved by making all the external dimensions of the brace 12 with a frame equal. At this time, by unifying the height of the framed brace 12 to a dimension that can be transported by a truck (for example, a maximum height of about 2400 mm to 2700 mm), it is possible to increase the transport efficiency by the truck or the like.

  Further, at the time of construction, a plurality of frame braces 12 are attached in the height direction of the window opening 22 of the existing building 14 and temporarily fixed with the support columns 30, and thereafter, with the form frames 46 and 48 and the frame brace 12. Since the concrete 34 is placed in the enclosed beam increasing space 58 to form the beam increasing reinforcement portion 32, the mounting process of the brace 12 with the frame and the reinforcing process of the outer wall structure 18 are separated, and the workability is improved. Can be improved and the construction period can be shortened.

In addition, the construction method of the seismic reinforcement 10 is not limited to the method described in the present embodiment, and the framed brace 12 and the beam-strike reinforcement portion 32 are sequentially constructed from the lower floor of the existing building 14 to the upper floor. It is also possible to do it.
In addition, the concrete 34 may be placed in the beam striking space by making an injection hole in the lower frame member 26H on the lower side of the framed brace 12 and pouring the concrete 34 from the injection hole.

  Moreover, in this embodiment, the case where the brace 24 was used as an earthquake-resistant element was demonstrated. However, it is not limited to this, For example, it may replace with the brace 24 and the structure which employ | adopted the steel plate earthquake resistant wall which attached the steel plate containing a corrugated steel plate to the frame material may be sufficient.

10 Seismic reinforcement 12 Brace with frame (seismic reinforcement with frame)
14 Existing building 16 Column (column beam frame)
17 Beam (column beam frame)
17F External surface of beam 18 External wall structure 18F External surface of external wall structure 20 Column beam structure 22 Opening 24 Brace (seismic element)
26 Frame 28 Reinforcing bar 30 Strut (connecting member)
32 Beam-strike reinforcement 34 Concrete (filler)
46 Formwork 48 Formwork 58 Beam Strike Space

Claims (3)

Placing a framed seismic reinforcement body with no bolt joints on the outside of a plurality of openings in a column beam frame of an existing building;
Arranging reinforcing reinforcing bars on the outer surface of the beam of the column beam frame;
Surrounding the reinforcing steel bars with a formwork and partitioning the beam striking space;
Filling the beam striking space with a filler to form a beam striking reinforcement portion, and fixing the framed seismic reinforcement to the beam striking reinforcement portion;
Seismic reinforcement method having The plurality of framed seismic reinforcements are all formed at the same height,
Adjusting the upper surface position of the beam-strike reinforcement portion, and fixing the frame-equipped seismic reinforcement body to the beam striking reinforcement portion,
The earthquake-proof reinforcement method of Claim 1. The lower surface of the upper seismic reinforcing body with frame and the upper surface of the lower seismic reinforcing body with frame are connected to a connecting member fixed to the outer surface of the beam,
The earthquake-proof reinforcement method of Claim 1 or 2.

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