JP5324688B1 - Seismic reinforcement method - Google Patents

Abstract

The present invention provides an earthquake-resistant reinforcement method in which the influence on the habitability, functionality, and lighting of a building after reinforcement is sufficiently reduced.
According to one aspect of the present invention, in a seismic reinforcement method, a column reinforcement striking step in which a column reinforcement striking portion 62 is further beaten outside the existing column 30 and a beam reinforcement striking portion 64 outside the existing beam 32. Beam reinforcement striking step, and a pair of L-shaped reinforcement pieces 12 and a pair of I-type reinforcement pieces 14 are anchored to the column reinforcement striking portion 62 and the beam reinforcement striking portion 64 to reinforce the column. And a reinforcing piece fixing step of injecting an epoxy resin between the pair of L-shaped reinforcing pieces 12 and the pair of I-shaped reinforcing pieces 14.
[Selection] Figure 15

Description

  The present invention relates to a seismic strengthening method in seismic strengthening work for existing buildings.

  Some existing buildings do not satisfy the current building standards, and there are many that need to increase seismic strength. As a technique for increasing the seismic strength of such an existing building, a general method includes a method of adding a reinforced concrete wall and a method of adding a steel brace.

  However, the method of adding reinforced concrete walls has a problem that the lighting in the room is affected because the opening of an existing building is covered with a wall surface. Therefore, when it is desired to open the interior of a building, it is common to perform seismic reinforcement with a method of adding steel braces, but part of the opening is blocked and the view from the window is damaged. There is a problem such as a step in the floor.

  Therefore, in order to solve the above-described problems, Patent Documents 1 to 3 disclose that the inside of the inner peripheral surface of the opening of the existing column beam frame composed of columns and beams of the existing building is divided and transported. A method of inserting and inserting a reinforcing unit that facilitates installation is disclosed.

Japanese Patent No. 4445007 Patent No. 4400833 Patent No. 4446401

  However, according to the construction methods disclosed in Patent Documents 1 to 3, the reinforcement unit is inserted and fitted inside the inner peripheral surface of the opening of the existing column beam frame of the existing building. A part of the opening of the beam frame is blocked, and the opening area of the opening of the existing column beam frame is reduced. Therefore, when the opening of the existing column beam frame is like an entrance to a building, there is a risk that it may hinder people from entering and exiting. In addition, windows and doors are generally installed in the opening of the existing column beam frame. However, if a part of the opening of the existing column beam frame is blocked by the reinforcement unit, sunlight is blocked by the reinforcement unit. End up. Therefore, the influence on the habitability and lighting of the building after reinforcement may not be sufficiently reduced.

  In addition, the installation specifications of windows and doors installed in the openings of the existing column beam frame are diverse, and depending on the installation specifications of the windows and doors, reinforcement is made inside the inner peripheral surface of the opening of the existing column beam frame. When the unit is inserted and fitted, it may interfere with opening and closing of windows and doors. Therefore, there is a possibility that the influence on the functionality of the building after reinforcement is not sufficiently reduced.

  Therefore, the present invention has been made to solve the above-mentioned problems, and it is an object to provide an earthquake-resistant reinforcement method that can sufficiently reduce the habitability, functionality, and lighting of buildings after reinforcement. And

  One form of the present invention made to solve the above-mentioned problems is a method of seismic reinforcement by a unit that reinforces an existing column beam frame composed of an existing column and an existing beam of an existing building. In the seismic reinforcement method of assembling a gate-type reinforcing unit by connecting a reinforcing piece, a pair of I-shaped reinforcing pieces and bolts, a column reinforcing main bar arranged parallel to the column outside the existing column, and the column reinforcing A column reinforcement striking step in which a column reinforcement striking portion having a reinforcing band wound in a direction orthogonal to the main reinforcement is added by an anchor, and a beam reinforcement main reinforcement arranged parallel to the beam outside the existing beam, A beam reinforcement striking step in which a beam reinforcement striking portion having a reinforcement reinforcing bar wound in a direction orthogonal to the beam reinforcing main reinforcement is added by an anchor; and the column reinforcement striking portion and the beam reinforcement striking portion. In contrast, the pair of L-shaped reinforcements And a pair of I-type reinforcement pieces are anchored to each other, and between the column reinforcement increased portion, the beam reinforcement increased portion, the pair of L-type reinforcement pieces, and the pair of I-type reinforcement pieces. And a reinforcing piece fixing step for injecting an adhesive resin.

  According to this embodiment, since the reinforcement piece is fixed to the column reinforcement striking portion that is struck outside the existing column and the beam reinforcement striking portion that is struck outside the existing beam, the reinforcement composed of the reinforcement piece It can suppress that the opening area of the opening part of the existing column beam frame becomes small with a unit. Therefore, when the opening of the existing column beam frame is like an entrance to a building, it is difficult for people to enter and exit. Moreover, it can suppress that the sunlight taken in into the room | chamber interior of a building from the window and door installed in the opening part of the existing column beam frame is interrupted | blocked by the reinforcement unit. Furthermore, there is no risk of hindering the opening and closing of windows and doors installed in the openings of the existing column beam frame by the reinforcing unit. Therefore, the influence on the habitability, functionality, and lighting of the building after reinforcement is sufficiently reduced.

  In the above embodiment, it is preferable that the beam reinforcing striking portion includes a space portion at a location corresponding to a portion where the exhaust sleeve is disposed.

  According to this embodiment, since the exhaust sleeve is not blocked by the beam reinforcement striking portion, the exhaust from the interior of the building can be discharged to the outside of the building through the exhaust sleeve without any problem. Therefore, the functionality of the existing building can be maintained. And even if there is a part that is not overstrung in part of the beam reinforcement striking part in this way, as described above, the column reinforcement striking with the column reinforcement main reinforcement and the reinforcement strips installed inside the existing pillar Reinforcement unit maintains seismic strength under the structure in which the beam reinforcement striking part with the beam reinforcement main bar and reinforcement bar on the outside of the beam and the existing beam is added, and the exhaust sleeve is arranged Since the size of the part that is made is very limited, it is possible to ensure sufficient strength of seismic reinforcement.

  In said form, it is preferable to make the height of the said beam reinforcement hitting part smaller than the height of the said existing beam.

  According to this form, it can suppress reliably that the opening area of the opening part of the existing column beam frame becomes small by the reinforcement unit. Therefore, the influence on the habitability, functionality, and lighting of the building after reinforcement is more sufficiently reduced.

  According to the seismic reinforcement method according to the present invention, the influence on the habitability, functionality, and lighting of the building after reinforcement is sufficiently reduced.

It is the figure which showed the schematic front of the reinforcement unit. It is a schematic front view of the reinforcement piece which comprises a reinforcement unit. It is a figure which shows performing existing finishing removal. It is a figure which shows performing anchor drilling etc. with respect to the existing pillar and the existing beam. It is a figure which shows performing a roughening and bar arrangement | positioning to the part to be additionally hit. It is a figure which shows performing concrete placement in the part which is to be struck further. It is a figure which shows performing anchor drilling to a column reinforcement | strengthening striking part and a beam reinforcement striking part. It is a figure which shows attaching the left type I reinforcement piece. It is a figure which shows attaching the left L-shaped reinforcement piece. FIG. 10 is a view of the flange portion of the joint portion as seen through the column reinforcement striking portion from the left side of FIG. 9. It is a figure which shows attaching the right type I reinforcement piece. It is a figure which shows attaching the L type reinforcement piece of the right side. It is a figure which shows inject | pouring an epoxy resin between a column reinforcement | strengthening striking part and a reinforcement unit, or between a beam reinforcement striking part and a reinforcement unit. It is a figure which shows inject | pouring grout into the joint part etc. of an I-type reinforcement piece and an L-type reinforcement piece. It is a schematic front view of the column reinforcement striking part, the beam reinforcement striking part, the reinforcement unit, and their periphery after completion of the seismic strengthening work by the seismic strengthening method of the first embodiment. It is AA sectional drawing of FIG. It is BB sectional drawing of FIG. It is sectional drawing corresponding to FIG. 16 in the example which changed the arrangement position of an I-type reinforcement piece and an L-type reinforcement piece. It is sectional drawing corresponding to FIG. 17 in the example which changed the arrangement position of an I-type reinforcement piece and an L-type reinforcement piece. It is a schematic front view of the column reinforcement striking part, the beam reinforcement striking part, the reinforcement unit, and their periphery after the completion of the seismic strengthening work by the seismic strengthening method according to the second embodiment. It is the figure which showed the schematic front of the reinforcement unit of a modification.

  Next, an embodiment embodying the seismic reinforcement method according to the present invention will be described with reference to the drawings.

<Example 1>
First, Example 1 will be described. First, the reinforcing unit 10 will be described. Here, FIG. 1 is a diagram showing a schematic front view of the reinforcing unit 10. FIG. 2 is a schematic front view of the reinforcing piece constituting the reinforcing unit 10.

  As shown in FIGS. 1 and 2, the reinforcing unit 10 is connected so as to extend two L-shaped reinforcing pieces 12 composed of two orthogonal sides and extend one side of each of the two L-shaped reinforcing pieces 12. Two I-shaped reinforcing pieces 14 are provided. And the reinforcement unit 10 is comprised by the portal shape by joining symmetrically so that the front-end | tips of the other one side of the two said L type reinforcement pieces 12 may be connected. The reinforcing unit 10 is a reinforcing member in which concrete is wound around a steel frame.

  The L-shaped reinforcing piece 12 is formed in an L shape. The L-shaped reinforcement piece 12 includes an upper side portion 16 disposed in a beam reinforcement increased portion 64 (see FIG. 6 and the like) described later, and a column reinforcement increased portion 62 (described in FIG. 6 and the like) orthogonal to the upper side portion 16 and described later. And a vertical column portion 18 arranged in the reference).

  The I-type reinforcing piece 14 is formed in a prismatic shape. The I-shaped reinforcing piece 14 is disposed in the column reinforcement striking portion 62 at the time of the seismic reinforcement, and the upper end is connected to the lower end of the vertical column portion 18 of the L-shaped reinforcing piece 12. And the I-type reinforcement piece 14 is provided with the base plate 20 mounted in the balcony slab 36 (refer FIG. 3 etc.) mentioned later in a lower end.

  Each of the L-shaped reinforcing piece 12 and the I-shaped reinforcing piece 14 is so-called steel concrete in which concrete is wound around a steel material as a bone. H-type steel is used as the steel material, and the concrete wound around the steel may be used for general SRC (Steel Reinforced Concrete) construction or may be a fiber reinforced concrete. The H-shaped steel 22 that becomes the bone of the L-shaped reinforcing piece 12 is composed of two sides welded so as to be orthogonal to each other. Further, the H-shaped steel 24 that becomes the bone of the I-type reinforcing piece 14 is linear.

  A base plate 20 is placed on the lower end of the H-shaped steel 24 of the I-type reinforcing piece 14 so that the lower end of the H-shaped steel 24 abuts on the base plate 20, and is fixed by welding.

  Further, bolt holes 26 are respectively provided at the end of the H-shaped steel 22 of the L-shaped reinforcing piece 12 and the end of the H-shaped steel 24 of the I-shaped reinforcing piece 14. The position and number of the bolt holes 26 are not particularly limited.

  Next, the content of the seismic reinforcement method of Example 1 will be described. The seismic reinforcement method according to the first embodiment is roughly divided into a step-up process and a reinforcement piece fixing process.

(Increase punching process)
First, the additional punching process will be described. In this extra step, first, the existing finish is removed. Specifically, as shown in FIG. 3, a finishing member (for example, an outer wall material such as a tile or a painting) of an existing column beam frame 34 composed of the existing column 30 and the existing beam 32 of the existing building 1 is used. Remove. More specifically, with respect to the existing pillar 30, the finishing member in the portion to be struck out in the portion excluding the balcony slab 36 on the outer surface (the front side in FIG. 3) is removed. Further, with respect to the existing beam 32, the finishing member in the additional hitting portion 40 is removed on the outer side (the front side in FIG. 3), while the exhaust 44 and the portion 44 on the opening 42 side of the existing column beam frame 34 are exhausted. The finishing member in the peripheral portion of the sleeve 46 is not removed. Here, the additional hitting portion 40 is a portion on the side of the balcony slab 36 in the existing beam 32 and a portion excluding the periphery of the exhaust sleeve 46.

  Next, rebar exploration and anchor drilling are performed. Specifically, the reinforcing bars inside the existing columns 30 and the existing beams 32 are searched, and the anchor holes 48 are formed as shown in FIG. 4 while avoiding the reinforcing bars inside the existing columns 30 and the existing beams 32. To do. More specifically, a plurality of anchor holes 48 are formed in the additional hitting portion 38 of the existing column 30 and the additional hitting portion 40 of the existing beam 32. At this time, a through-hole 50 is formed in the balcony slab 36 so as to penetrate in the thickness direction of the balcony slab 36 (vertical direction in FIG. 4).

  Next, perform vandalization and reinforcement. Specifically, various reinforcing bars are arranged in the anchor hole 48 (see FIG. 4) in the additional striking portion 38 of the existing column 30 and the planned striking portion 40 of the existing beam 32. As shown in FIG. 5, in detail, a reinforcement reinforcing bar 52 of a reinforcing bar arranged in parallel to the existing column 30 and a reinforcement of a reinforcing bar wound in a direction orthogonal to the reinforcing pillar 52 of the column are provided in the additional hitting portion 38. A band 54 is arranged. Further, a beam reinforcing main bar 56 arranged in parallel with the existing beam 32 and a reinforcing bar 58 wound in the direction orthogonal to the beam reinforcing main bar 56 are arranged in the additional hitting portion 40.

  Further, roughening is performed on the additional hitting planned portion 38 of the existing column 30 and the additional hitting scheduled portion 40 of the existing beam 32. Here, the “meshing” is an operation of forming a rough surface on the surface of the old concrete to improve the integrity with the new concrete to be succeeded later. Further, a sheath tube 60 is installed below the through hole 50 of the balcony slab 36.

  Next, concrete placement is performed. Specifically, as shown in FIG. 6, concrete is driven into the additional striking portion 38 (see FIG. 5) of the existing pillar 30 and the striking portion 40 (see FIG. 5) of the existing beam 32 to reinforce the column. The increased hitting part 62 and the beam reinforcing increased hitting part 64 are formed. At this time, a space 66 is formed in the existing beam 32 at a location corresponding to the site where the exhaust sleeve 46 is disposed so as not to form the beam reinforcement hitting portion 64.

  In this manner, in the additional striking step, the column reinforcement striking portion 62 in which the column reinforcing main bars 52 and the reinforcing strips 54 are provided outside the existing columns 30 (the front side of the drawing in FIG. 6) is increased by the anchors. A column-strike process is performed. Further, in the extra striking step, a beam augmentation unit in which a beam reinforcement striking portion 64 in which a beam reinforcing main bar 56 and a reinforcing bar 58 are provided on the outside of the existing beam 32 (the front side in FIG. 6) is increased by an anchor. A punching process is also performed. However, by forming the space portion 66 in the beam reinforcement hitting portion 64 in the beam reinforcement hitting step, beam reinforcement is provided at a location corresponding to the portion where the exhaust sleeve 46 is disposed in the existing beam 32. The additional hitting portion 64 is not increased.

  Further, in the additional hitting process, concrete is driven into a portion of the existing beam 32 scheduled to be hit 40 to form the beam reinforcing hitting portion 64. In this manner, the height (vertical width) of the beam reinforcement hitting portion 64 is made smaller than the height (vertical width) of the existing beam 32. More specifically, as shown in FIG. 6 and FIG. 16 to be described later, the height h of the beam reinforcement hitting portion 64 is made smaller than the height H of the portion below the balcony slab 36 in the existing beam 32. As described above, the additional punching process is performed.

(Reinforcement piece fixing process)
Next, the reinforcing piece fixing step will be described. In this reinforcing piece fixing step, first, anchor drilling is performed on the column reinforcement striking portion 62 and the beam reinforcement striking portion 64. Specifically, as shown in FIG. 7, anchor holes 68 are formed in the column reinforcing hitting portion 62 and the beam reinforcing hitting portion 64 with a concrete drill. In the example shown in FIG. 7, four anchor holes 68 are formed in each of the left and right column reinforcing increased portions 62 and the beam reinforcing increased portion 64, but the number of anchor holes 68 is as follows. There is no particular limitation. At this time, the through bolt 70 is disposed inside the through hole 50 and the sheath tube 60. At this time, it is preferable that the construction of the reinforcing unit 10 has already been completed on the lower floor.

  Next, the left I-shaped reinforcing piece 14 is attached. Specifically, as shown in FIG. 8, the I-type reinforcement piece 14 is attached by moving the I-type reinforcement piece 14 toward the left column reinforcement striking portion 62 and temporarily fastening the through bolts 70 with the base plate 20. .

  Next, the left L-shaped reinforcing piece 12 is attached. Specifically, as shown in FIG. 9, the L-shaped reinforcing piece 12 is arranged on the upper side of the I-shaped reinforcing piece 14 and close to the left column reinforcing hitting portion 62 and the beam reinforcing hitting portion 64. Then, the bolt is temporarily tightened via the plate 74 at the joint portion 71 (H-shaped steel 22) of the L-shaped reinforcing piece 12 and the joint portion 72 (H-shaped steel 24) of the I-shaped reinforcing piece 14. At this time, the bolts are temporarily tightened via the plate 77 also in the flange portion 73 </ b> A of the joint portion 71 and the flange portion 75 </ b> A of the joint portion 72. The bolts are also temporarily tightened via the plate 79 at the flange portion 73B of the joint portion 71 and the flange portion 75B of the joint portion 72. Thereby, the L-shaped reinforcing piece 12 is attached. At this time, the L-shaped reinforcing piece 12 is supported by the support member 76.

  FIG. 10 shows a view of the flange portion 73B of the joint portion 71 and the flange portion 75B of the joint portion 72 as seen through the column reinforcement striking portion 62 from the left side of FIG. As shown in FIG. 10, a hole 81 for anchoring, which will be described later, is formed on the left side (inner side) of the flange portion 73B of the joint portion 71 and the flange portion 75B of the joint portion 72.

  Next, the right I-shaped reinforcement piece 14 is attached. Specifically, as shown in FIG. 11, the new I-type reinforcing piece 14 is brought to the right column reinforcement striking portion 62, and the through bolt 70 is temporarily tightened with the base plate 20, whereby the I-type reinforcing piece 14. Install.

  Next, the L-shaped reinforcing piece 12 on the right side is attached, and the bolts are tightened and anchors are fixed to the joint. Specifically, as shown in FIG. 12, the new L-shaped reinforcing piece 12 is brought close to the right column reinforcing striking portion 62 and the beam reinforcing striking portion 64 above the right I-shaped reinforcing piece 14. Arrange. At this time, the L-shaped reinforcing piece 12 is supported by the support member 76.

  Then, the bolt is finally tightened via the plate 74 at the joint portion 71 of the left L-shaped reinforcement piece 12 and the joint portion 72 of the left I-type reinforcement piece 14. At this time, the bolts are finally tightened via the plate 77 also in the flange portion 73 </ b> A of the joint portion 71 and the flange portion 75 </ b> A of the joint portion 72. Also, the bolts are finally tightened via the plate 79 at the flange portion 73 </ b> B of the joint portion 71 and the flange portion 75 </ b> B of the joint portion 72. Further, the bolt is finally tightened via the plate 74 at the joint portion 71 of the right L-shaped reinforcing piece 12 and the joint portion 72 of the right I-shaped reinforcing piece 14. At this time, the bolts are finally tightened via the plate 77 also in the flange portion 73 </ b> A of the joint portion 71 and the flange portion 75 </ b> A of the joint portion 72. Also, the bolts are finally tightened via the plate 79 at the flange portion 73 </ b> B of the joint portion 71 and the flange portion 75 </ b> B of the joint portion 72. Further, the bolts are finally tightened via the plate 80 at the joint portion 78 (H-shaped steel 22) of the L-shaped reinforcement piece 12 on the right side and the joint portion 78 of the L-type reinforcement piece 12 on the left side.

  It should be noted that welding is also conceivable as a fixing method between the L-shaped reinforcing pieces 12 and between the L-shaped reinforcing piece 12 and the I-shaped reinforcing piece 14, and such a joining method is not denied, but the purpose of seismic reinforcement is Considering the premise, the reinforcing unit 10 is preferably constructed integrally because it is possible to increase the strength when it is configured integrally. When welding is performed, a welding machine and a power source are required at the site, and there is a problem such as extra costs. Therefore, it is more advantageous to be able to fasten with bolts or the like.

  Further, as described above, the reinforcing unit 10 composed of the pair of L-shaped reinforcing pieces 12 and the pair of I-shaped reinforcing pieces 14 is attached to the column reinforcing hitting portion 62 and the beam reinforcing hitting portion 64 by an adhesive anchor. Secure. Specifically, in the anchor hole 68 formed in the column reinforcing hitting portion 62 and the beam reinforcing hitting portion 64, a cutting bolt 82 is attached together with the chemical to the flange portion 73B of the joint portion 71 and the flange portion 73 of the joint portion 72. After filling through the hole 81 (see FIG. 10) of the part 75B, the chemical is cured. Here, the type of anchor is not particularly limited as long as it can integrally construct a protruding object on a column or beam, such as a hole-in anchor or a chemical anchor.

  Further, an epoxy resin putty material is used to inject an epoxy resin into the gap between the column reinforcement striking portion 62 and the reinforcement unit 10 or the gap between the beam reinforcement striking portion 64 and the reinforcement unit 10 as will be described later. Seal with.

  Next, an epoxy resin that is an adhesive resin is injected. Specifically, as shown in FIG. 13, the gap between the column reinforcement increased portion 62 and the reinforcement unit 10 or the gap between the beam reinforcement increased portion 64 and the reinforcement unit 10 is sealed with an epoxy resin putty material. And inject epoxy resin. Thereby, the resin part 84 is formed in the three directions of the column reinforcement hitting part 62 and the beam reinforcement hitting part 64. In some cases, epoxy resin is also injected under the base plate 20 of the I-type reinforcing piece 14.

  Next, grout is injected into the joint. Specifically, the joint part 71 (see FIG. 13) of the L-shaped reinforcement piece 12 and the joint part 72 (see FIG. 13) of the I-type reinforcement piece 14 and the joint part 78 ( As shown in FIG. 14, a grout 88 is injected into the joint portion 86 (see FIG. 13) at the lower ends of the left and right I-shaped reinforcement pieces 14. The grout 88 may be composed of non-shrink mortar, but in this embodiment, fiber reinforced concrete is used in order to increase the strength of the reinforcing unit 10.

  Next, finish. Specifically, as shown in FIG. 15, the outer wall is finished by attaching finishing members or painting the surfaces of the column reinforcement striking portion 62, the beam reinforcement striking portion 64, and the reinforcement unit 10. . As a result, the pillar reinforcement striking portion 62, the beam reinforcement striking portion 64, and the reinforcement unit 10 are made inconspicuous, so that it does not matter that the building is seismically reinforced in appearance.

  Here, FIG. 16 is a sectional view taken along the line AA in FIG. 15, and FIG. 17 is a sectional view taken along the line BB in FIG. As shown in FIG. 16, the L-shaped reinforcing piece 12 is anchored to the inside of the beam reinforcement hitting portion 64 using a dimension bolt 82 and a reinforcing plate 90 via a resin portion 84. As shown in FIG. 17, the I-type reinforcing piece 14 is anchored to the inner side of the column reinforcing hitting portion 62 using a dimension bolt 82 and a reinforcing plate 92 via a resin portion 84. As shown in FIG. 17, the position 31 of the existing beam 32 is indicated by a virtual line, and the surface 31 on the outer side of the existing column 30 (outside, lower side in FIG. 17) is outside the existing beam 32 (outside, in FIG. 17). It is flush with the lower surface 33.

  In this way, in the reinforcing piece fixing step, the pair of L-shaped reinforcing pieces 12 and the pair of I-shaped reinforcing pieces 14 are anchored to the column reinforcing increased portion 62 and the beam reinforcing increased portion 64, and the column An epoxy resin is injected between the reinforcing hitting portion 62, the beam reinforcing hitting portion 64, the pair of L-shaped reinforcing pieces 12, and the pair of I-shaped reinforcing pieces 14. Thus, the seismic reinforcement method of this embodiment is completed.

  In Example 1 as described above, the following effects can be obtained. The first embodiment is a method of seismic reinforcement with a unit that reinforces an existing column beam frame 34 composed of an existing column 30 and an existing beam 32 of an existing building 1, and includes a pair of L-shaped reinforcing pieces 12 and a pair of In the seismic reinforcement method of assembling the portal reinforcement unit 10 by joining the I-type reinforcement piece 14 with bolts, a column reinforcement main bar 52 arranged in parallel to the existing column 30 outside the existing column 30, and a column reinforcement main bar 52 A column reinforcement striking step in which a column reinforcement striking portion 62 having a reinforcing band 54 wound in an orthogonal direction is added by an anchor, and a beam disposed outside the existing beam 32 in parallel with the existing beam 32 A beam reinforcement striking step in which a beam reinforcement striking portion 64 having a reinforcement main reinforcement 56 and a reinforcement reinforcement 58 wound in a direction orthogonal to the beam reinforcement principal reinforcement 56 is added by an anchor, a column reinforcement striking portion 62 and a beam Reinforcement hitting part 6 On the other hand, the pair of L-shaped reinforcing pieces 12 and the pair of I-shaped reinforcing pieces 14 are anchored, the column reinforcing increased portion 62, the beam reinforcing increased portion 64, the pair of L-shaped reinforcing pieces 12 and the pair of A reinforcing piece fixing step of injecting an epoxy resin between the I-type reinforcing piece 14.

  Thus, by increasing the bending strength and shear strength of the columns and beams of the existing building 1 by the column reinforcement increasing portion 62, the beam reinforcement increasing portion 64 and the reinforcement unit 10, the strength of the existing building 1 can be increased. Toughness can be improved.

  Then, a pair of L-shaped reinforcing pieces 12 and a pair of I-shaped reinforcing pieces are provided for the column reinforcing striking portion 62 that strikes outside the existing column 30 and the beam reinforcing striking portion 64 that strikes outside the existing beam 32. 14 is fixed, it is possible to prevent the opening area of the opening 42 of the existing column beam frame 34 from being reduced by the reinforcing unit 10. Therefore, when the opening 42 of the existing column beam frame 34 is like an entrance to the existing building 1, it is difficult for people to enter and exit. Moreover, it can suppress that the sunlight taken in into the room | chamber interior of the existing building 1 from the window and door installed in the opening part 42 of the existing column beam frame 34 by the reinforcement unit 10 is interrupted | blocked. Furthermore, there is no risk of hindering the opening and closing of windows and doors installed in the opening 42 of the existing column beam frame 34. Therefore, the influence on the habitability, functionality, and lighting of the existing building 1 after reinforcement is sufficiently reduced.

  Further, the beam reinforcement striking portion 64 includes a space portion 66 at a location corresponding to a location where the exhaust sleeve 46 is disposed. That is, in the existing beam 32, the beam reinforcement hitting portion 64 is not added to the space 66 corresponding to the portion where the exhaust sleeve 46 is disposed. Thereby, since the exhaust sleeve 46 is not blocked by the beam reinforcing striking portion 64, the exhaust can be discharged from the room of the existing building 1 through the exhaust sleeve 46 to the outside of the existing building 1 without any problem. Therefore, the functionality of the existing building 1 can be maintained. And even if there is a portion that is not added to a part of the beam reinforcing increased portion 64 in this way, the column reinforcing main bar 52 and the reinforcing band 54 are provided outside the existing column 30 as described above. The H-shaped steel 22 and H of the reinforcement unit 10 under the structure in which a beam reinforcement striking portion 64 in which a beam reinforcement main bar 56 and a reinforcing bar 58 are provided outside the column reinforcement striking portion 62 and the existing beam 32 are added. Since the steel plate 24 maintains the seismic strength, and the portion where the exhaust sleeve is disposed is very limited in size, a sufficient strength of seismic reinforcement can be ensured. This is proved by an evaluation experiment of seismic strength, as will be described later.

  In addition, since the height h of the beam reinforcement hitting portion 64 is made smaller than the height H of the existing beam 32, the reinforcement unit 10 can reliably suppress the opening area of the opening 42 of the existing column beam frame 34 from being reduced. it can. Therefore, the influence on the habitability, functionality, and lighting of the existing building 1 after reinforcement is more sufficiently reduced.

  Further, since the reinforcing unit 10 can be divided into the L-shaped reinforcing piece 12 and the I-shaped reinforcing piece 14, it becomes easy to carry in, and it is not necessary to particularly secure a loading path for the L-shaped reinforcing piece 12 and the I-shaped reinforcing piece 14. There is a high possibility that it will be completed.

  In addition, the position which arrange | positions the L-shaped reinforcement piece 12 and the I-type reinforcement piece 14 can be changed suitably. For example, as shown in FIG. 18, the L-shaped reinforcing piece 12 is brought into contact with the existing beam 32, and as shown in FIG. 19, the I-shaped reinforcing piece 14 is placed against the existing column 30 and the column reinforcing striking portion 62. The L-shaped reinforcing piece 12 and the I-shaped reinforcing piece 14 may be arranged so as to be anchored. At this time, as shown in FIG. 19 with the position of the existing beam 32 indicated by phantom lines, the outer surface 31 of the existing column 30 is located outside the outer surface 33 of the existing beam 32 (outdoor, lower side of FIG. 19). Protruding to the side).

<Example 2>
Further, as Example 2, as shown in FIG. 20, an example in which the exhaust beam 46 is not formed in the existing beam 32 and the space portion 66 is not formed in the beam reinforcing striking portion 64 is also considered. It is done. According to the second embodiment, in addition to the effects of the first embodiment, the effect of further improving the earthquake resistance can be obtained.

<Modification>
In addition, as a modification, the reinforcing unit 10 may be shaped as shown in FIG. In the modification shown in FIG. 21, the L-shaped reinforcing piece 12 is thickened on the inner side of the L-shape, and the width of the L-shaped reinforcing piece 12 in the direction parallel to the existing pillar 30 (vertical direction in FIG. 21) is increased. ing.

<Evaluation of seismic strength>
A horizontal load test was performed on the building reinforced by the seismic reinforcement method of the present invention as described above, and the seismic strength was evaluated. The evaluation is based on an existing structural test body having a structure equivalent to that of the existing building 1 in which the seismic reinforcement method of the present invention has not been applied, and a structure equivalent to Example 1 in which the seismic reinforcement method of the present invention has been applied. And a second structural test body having a structure equivalent to that of Example 2 in which the seismic reinforcement method of the present invention was applied.

  As a result of such evaluation, the maximum layer shear force that can be withstood was 235.5 kN for the existing structural test body, whereas it was 420.0 kN for the first structural test body, and 524.k for the second structural test body. It became 5kN. That is, the value of the maximum layer shear force that can be endured was increased by about 80% for the first structural specimen and about 123% for the second structural specimen relative to the existing structural specimen. Thus, according to the seismic reinforcement method of this invention, it turned out that sufficient intensity | strength of earthquake resistance reinforcement is acquired. It should be noted that sufficient strength of the seismic reinforcement was obtained even in the first structural test body having the structure in which the space portion 66 is present in the beam reinforcement striking portion 64. The iron frame (the H-shaped steel 22 and the steel frame 22) This is probably because the H-shaped steel 24) maintains the seismic strength.

  It should be noted that the above-described embodiment is merely an example and does not limit the present invention in any way, and various improvements and modifications can be made without departing from the scope of the invention. For example, instead of the reinforcing unit 10 having a gate shape, a rectangular frame shape may be used.

DESCRIPTION OF SYMBOLS 1 Existing building 10 Reinforcement unit 12 L-type reinforcement piece 14 I-type reinforcement piece 30 Existing column 32 Existing beam 34 Existing column beam frame 36 Balcony slab 38 Planned additional hit portion 40 Planned additional hit portion 42 Opening portion 46 Exhaust sleeve 62 Column Reinforcement hitting part 64 Beam reinforcing hitting part 66 Space part 84 Resin part H Height of existing beam h Height of beam reinforcing hitting part

Claims (2)

It is a method of seismic reinforcement by a unit that reinforces an existing column beam frame composed of existing columns and existing beams of an existing building, and is coupled with a pair of L-type reinforcement pieces, a pair of I-type reinforcement pieces and bolts In the seismic reinforcement method of assembling the portal-type reinforcement unit,
Column augmentation that adds a column reinforcement striking portion with an anchor to the outside of the existing column, with a column reinforcement main bar arranged parallel to the column and a reinforcement strip wound in a direction orthogonal to the column reinforcement main reinforcement. The punching process;
A beam reinforcement for adding a beam reinforcement striking portion with a beam reinforcing main bar arranged parallel to the beam and a reinforcing bar wound in a direction orthogonal to the beam reinforcing main bar to the outside of the existing beam. The punching process;
The pair of I-shaped reinforcing pieces are anchored to the column reinforcing increased portion, and the pair of L-shaped reinforcing pieces are anchored to the column reinforcing increased portion and the beam reinforcing increased portion, Adhesive resin is injected between the pair of I-shaped reinforcing pieces and the column reinforcing striking portion, and between the pair of L-shaped reinforcing pieces and the column reinforcing striking portion and the beam reinforcing striking portion. Having a reinforcing piece fixing step,
Making the height of the beam reinforcement striking portion smaller than the height of the existing beam,
The beam reinforcing striking portion is brought close to the upper end side of the existing beam, and is provided at a height of 1/2 or less of the beam length of the existing beam,
Seismic reinforcement method characterized by In the seismic reinforcement method according to claim 1,
The beam reinforcing striking portion includes a space portion at a position corresponding to a portion where the exhaust sleeve is disposed;
Seismic reinforcement method characterized by

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