WO2014030483A1 - 耐震補強工法 - Google Patents
耐震補強工法 Download PDFInfo
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- WO2014030483A1 WO2014030483A1 PCT/JP2013/070109 JP2013070109W WO2014030483A1 WO 2014030483 A1 WO2014030483 A1 WO 2014030483A1 JP 2013070109 W JP2013070109 W JP 2013070109W WO 2014030483 A1 WO2014030483 A1 WO 2014030483A1
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- Prior art keywords
- reinforcement
- existing
- reinforcing
- column
- shaped
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G23/00—Working measures on existing buildings
- E04G23/02—Repairing, e.g. filling cracks; Restoring; Altering; Enlarging
- E04G23/0218—Increasing or restoring the load-bearing capacity of building construction elements
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/62—Insulation or other protection; Elements or use of specified material therefor
- E04B1/92—Protection against other undesired influences or dangers
- E04B1/98—Protection against other undesired influences or dangers against vibrations or shocks; against mechanical destruction, e.g. by air-raids
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
- E04H9/00—Buildings, groups of buildings or shelters adapted to withstand or provide protection against abnormal external influences, e.g. war-like action, earthquake or extreme climate
- E04H9/02—Buildings, groups of buildings or shelters adapted to withstand or provide protection against abnormal external influences, e.g. war-like action, earthquake or extreme climate withstanding earthquake or sinking of ground
- E04H9/021—Bearing, supporting or connecting constructions specially adapted for such buildings
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
- E04H9/00—Buildings, groups of buildings or shelters adapted to withstand or provide protection against abnormal external influences, e.g. war-like action, earthquake or extreme climate
- E04H9/02—Buildings, groups of buildings or shelters adapted to withstand or provide protection against abnormal external influences, e.g. war-like action, earthquake or extreme climate withstanding earthquake or sinking of ground
- E04H9/025—Structures with concrete columns
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
- E04H9/00—Buildings, groups of buildings or shelters adapted to withstand or provide protection against abnormal external influences, e.g. war-like action, earthquake or extreme climate
- E04H9/02—Buildings, groups of buildings or shelters adapted to withstand or provide protection against abnormal external influences, e.g. war-like action, earthquake or extreme climate withstanding earthquake or sinking of ground
- E04H9/027—Preventive constructional measures against earthquake damage in existing buildings
Definitions
- This invention relates to the seismic reinforcement method in the seismic reinforcement work for existing buildings.
- a general method includes a method of adding a reinforced concrete wall and a method of adding a steel brace.
- the method of adding reinforced concrete walls has problems such as affecting indoor lighting because the openings of existing buildings are covered with walls. 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.
- Patent Documents 1 to 3 describe that the divided pillars are transported inside the inner peripheral surface of the opening of the existing column beam frame composed of the columns and beams of the existing building. A method of inserting and inserting a reinforcing unit that facilitates installation is disclosed.
- 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.
- 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.
- 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.
- reinforcement is made inside the inner peripheral surface of the opening of the existing column beam frame.
- 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.
- the seismic reinforcement method in one aspect of the present invention made to solve the above problems is a method of seismic reinforcement with a unit that reinforces an existing column beam frame composed of existing columns and existing beams of an existing building,
- the seismic reinforcement method of assembling a gate-type reinforcement unit by connecting a pair of L-shaped reinforcing pieces and a pair of I-shaped reinforcing pieces with bolts, column reinforcement main bars arranged in parallel to the columns outside the existing columns;
- a column reinforcement striking step in which a column reinforcement striking portion having a reinforcing band wound in a direction perpendicular to the column reinforcing main reinforcement is provided by an anchor, and arranged outside the existing beam in parallel with the beam.
- a beam reinforcement striking step in which a beam reinforcement striking portion in which a beam reinforcement main reinforcing bar and a reinforcing reinforcing bar wound in a direction orthogonal to the beam reinforcing main reinforcement are installed is increased by an anchor, the column reinforcement striking portion and the beam reinforcement For extra hits
- the pair of L-shaped reinforcing pieces and the pair of I-shaped reinforcing pieces are anchored, and the column reinforcing striking portion, the beam reinforcing striking portion, the pair of L-shaped reinforcing pieces and the pair of I-shaped A reinforcing piece fixing step of injecting an adhesive resin between the reinforcing pieces.
- 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
- the beam reinforcing striking portion includes a space portion at a position corresponding to a portion where the exhaust sleeve is disposed.
- the exhaust sleeve 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.
- the height of the beam reinforcing increased portion is smaller than the height of the existing beam.
- the seismic reinforcement method in another aspect of the present invention made to solve the above problems is a method of seismically reinforcing an existing column beam frame constructed from an existing column and an existing beam with respect to an existing building by a reinforcement unit.
- the seismic reinforcement method of assembling a gate-type reinforcement unit by combining a pair of L-type reinforcement pieces and a pair of I-type reinforcement pieces the pair of L-type reinforcement pieces and the pair of I-type reinforcement pieces Are provided with studs, and the pair of I-shaped reinforcement pieces are arranged along the existing pillar outside the existing column, and the pair of L-shaped reinforcement is arranged outside the existing beam.
- a piece is arranged along the existing pillar and the existing beam, a reinforcing piece assembling step for assembling the pair of I-shaped reinforcing pieces and the pair of L-shaped reinforcing pieces, and after the reinforcing piece assembling step,
- the column reinforcing main bars are arranged outside the existing columns so that the studs of the pair of I-shaped reinforcing pieces and the studs on one side of the pair of L-shaped reinforcing pieces along the existing columns are provided internally.
- the reinforcement unit includes the column reinforcement increased portion that is placed in the column reinforcement reinforcement portion outside the existing column, and the beam reinforcement increase portion that is placed in the beam reinforcement reinforcement portion outside the existing beam.
- the beam reinforcement increased portion provided in the beam reinforcing reinforcement portion is provided close to the upper end side of the existing beam, and the height of the beam reinforcement increased portion is equal to the height of the existing beam. It is preferable that the height is smaller.
- the reinforcement unit can surely suppress the opening area of the opening of the existing column beam frame from becoming smaller, and can sufficiently suppress the influence on habitability, functionality, and lighting. That is, in the case where the opening of the existing column beam frame is an entrance / exit of an existing building, it is difficult for people to enter and exit even after the existing building is reinforced. Moreover, it can suppress that the sunlight taken in into the room
- the height of the beam-reinforced striking portion is not more than 1/2 the height of the beam of the existing beam.
- the reinforcing piece that is one side along the existing beam (one side of the reinforcing unit) is directed from the lower surface of the existing beam on the upper beam side toward the opening of the existing column beam frame. It can be suppressed from protruding. Therefore, for example, existing buildings are apartment buildings, etc., and seismic reinforcement is applied to existing buildings with structures with large spans in the direction of the existing beams in the column beam frame at the border between the veranda and the room. When applied, the influence on the habitability, functionality, and daylighting by the reinforcing unit is suppressed to a small extent, and the existing building can be effectively seismically reinforced. In particular, in recent years, there has been a demand for development of seismic reinforcement technology that can sufficiently ensure such comfort, functionality, and daylighting as customer needs from residents of apartment houses, etc. Can fully meet such customer needs.
- the beam reinforcing striking portion includes a space portion at a position corresponding to a portion where the exhaust sleeve is disposed.
- the exhaust sleeve is not blocked by the beam reinforcement striking portion, and can maintain the function of exhausting the exhaust from the room of the existing building to the outside through the exhaust sleeve. Sex is maintained.
- the portion where the exhaust sleeve is disposed is extremely limited in size, even if there is a portion that is not added to the beam reinforcement hitting portion due to the space portion, Existing buildings that have been seismically reinforced can ensure sufficient seismic strength.
- each of the pair of L-shaped reinforcing pieces and the pair of I-shaped reinforcing pieces is a precast concrete member formed by integrally forming a steel material as a core material and concrete, and the stud is fixed to the steel material. It is preferable that
- the stud when the stud is fixed to the steel material at the seismic reinforcement site of the existing building, there are many restrictions on the space and the stud cannot be fixed efficiently. If the stud is fixed, the productivity of the stud fixing is improved, so that the cost of the reinforcing unit can be reduced. Moreover, when fixing a stud to steel materials by welding, it is not necessary to bring a welding machine and a curing sheet to an earthquake-proof reinforcement site only for welding a stud to steel materials. In addition, it is not necessary to place a qualified person of welding technology on the seismic reinforcement site just to weld the stud to the steel material.
- the seismic strengthening method of the present invention does not require the above-mentioned fixed required time at all, unlike the adhesive bonding method that requires a fixed required time until the strength of the adhesive is developed. Therefore, if the stud is fixed to the steel material at the factory in advance, it is possible to immediately start preparation for the next reinforcement piece assembly process for the reinforcement piece with the stud carried into the seismic reinforcement site. It can contribute to shortening the construction period of seismic reinforcement work.
- the influence on the habitability, functionality, and lighting of the building after reinforcement is sufficiently reduced.
- Example 1 of Embodiment 1 it is the figure which showed the schematic front of the reinforcement unit.
- Example 1 of Embodiment 1 it is a schematic front view of the reinforcement piece which comprises a reinforcement unit. It is a figure which shows performing the existing finish removal in Example 1 of Embodiment 1.
- FIG. 1 of Embodiment 1 it is a figure which shows performing anchor drilling etc. with respect to the existing pillar and the existing beam.
- Example 1 of Embodiment 1 it is a figure which shows performing a roughening and bar arrangement
- Example 1 of Embodiment 1 it is a figure which shows performing concrete placement in the part which is to be struck out.
- Example 1 of Embodiment 1 it is a figure which shows performing anchor drilling to a column reinforcement
- Example 1 of Embodiment 1 it is a figure which shows attaching the left type I reinforcement piece.
- Example 1 of Embodiment 1 it is a figure which shows attaching the left side 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.
- Example 1 of Embodiment 1 it is a figure which shows attaching the right type I reinforcement piece.
- Example 1 of Embodiment 1 it is a figure which shows attaching the L type reinforcement piece of the right side.
- Example 1 of Embodiment 1 it is a figure which shows inject
- Example 1 of Embodiment 1 it is a figure which shows pouring grout into the joint part etc. of an I-type reinforcement piece and an L-type reinforcement piece.
- FIG. 16 is a cross-sectional view taken along line AA of FIG.
- FIG. 16 is a sectional view taken along line BB in FIG. It is sectional drawing corresponding to FIG.
- FIG. 16 in the example which changed the arrangement position of an I-type reinforcement piece and an L-type reinforcement piece.
- FIG. 17 in the example which changed the arrangement position of an I-type reinforcement piece and an L-type reinforcement piece.
- FIG. 17 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 reinforcement work by the seismic strengthening method of Example 2 of the first embodiment. It is the figure which showed the schematic front of the reinforcement unit of the modification 1 of Embodiment 1.
- FIG. It is a figure explaining the earthquake-proof reinforcement construction method concerning the modification 2 of Embodiment 1, and is a schematic front view equivalent to FIG.
- FIG. 23 is a cross-sectional view taken along line FF in FIG. 22.
- FIG. 23 is a cross-sectional view taken along line FF in FIG. 22.
- FIG. 23 is a cross-sectional view taken along the line GG in FIG. 22. It is a front view which shows schematically the reinforcement unit which concerns on Example 1 among Embodiment 2, and is a figure shown in the state by which the reinforcement piece was assembled.
- FIG. 26 is a front view of the reinforcing unit shown in FIG. 25, showing the reinforcing piece in an exploded state.
- FIG. 27 is a cross-sectional view of a reinforcing piece that constitutes a reinforcing unit according to Example 1 in Embodiment 2, and is a cross-sectional view corresponding to a cross section taken along arrows HH and II shown in FIG. 26.
- FIG. 31 is a process diagram subsequent to FIG. 30, and is a fourth process diagram illustrating a state in which the left I-type reinforcement piece and the left L-type reinforcement piece are to be joined.
- FIG. 32 is a process diagram subsequent to FIG. 31, and is a fifth process diagram illustrating a state in which the right I-shaped reinforcement piece is disposed after the left I-shaped reinforcement piece and the left L-shaped reinforcement piece are joined.
- FIG. 34 is a process diagram following FIG. 33, showing that the right L-shaped reinforcing piece is to be joined to the right I-shaped reinforcing piece and the left L-shaped reinforcing piece joined to the left I-shaped reinforcing piece.
- FIG. 35 is a process drawing subsequent to FIG. 34, and is a seventh process chart showing a state in which the left and right I-shaped reinforcement pieces and the left and right L-shaped reinforcement pieces are joined to form a gate shape.
- FIG. 36 is a process diagram subsequent to FIG. 35, and is an eighth process diagram illustrating a column reinforcing bar arranging step and a beam reinforcing bar arranging step of the seismic strengthening method according to Example 1 in Embodiment 2.
- 36 is a process diagram subsequent to FIG. 36, and is a ninth process diagram illustrating a reinforcement unit fixing process of the earthquake-proof reinforcement method according to Example 1 in Embodiment 2.
- FIG. FIG. 38 is a process diagram following FIG.
- FIG. 40 is a cross-sectional view taken along the line KK in FIG.
- FIG. 40 is a cross-sectional view taken along line LL in FIG.
- FIG. 40 is an explanatory view showing a first case in which the position where the reinforcing unit according to Example 1 is arranged in the existing column beam frame is changed in the second embodiment, and is a cross-section corresponding to the position of the arrow KK in FIG.
- FIG. 40 is an explanatory view showing a second case in which the position where the reinforcing unit according to Example 1 is arranged on the existing column beam frame is changed in the second embodiment, and is a cross-section corresponding to the position of the arrow KK in FIG.
- FIG. 40 is a front view schematically showing an existing building that is seismically reinforced by the seismic reinforcement method according to Example 2 in Embodiment 2, and is an explanatory view corresponding to FIG. 39. It is a front view which shows schematically the reinforcement unit which concerns on the modification of Example 1, 2 among Embodiment 2, and is explanatory drawing equivalent to FIG.
- Embodiments 1 and 2 embodying the seismic reinforcement method according to the present invention will be described with reference to the drawings.
- Examples 1 and 2 and Modifications 1 and 2 are given in Embodiment 1
- Examples 1 and 2 and Modifications are given in Embodiment 2.
- Example 1 ⁇ Example 1> First, Example 1 will be described. First, the reinforcing unit 10 will be described.
- 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.
- 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.
- the reinforcement unit 10 is comprised by the portal shape by joining symmetrically so that the front-end
- 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 reinforcement 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.
- 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.
- the L-shaped reinforcing piece 12 and the I-shaped reinforcing piece 14 are so-called steel concrete in which concrete is wound around a steel material as a bone.
- H-type steel is used for the steel material, and the concrete wound around the steel material 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.
- the 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.
- a bolt hole 26 is provided in each of 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.
- the seismic reinforcement method according to the first embodiment is roughly divided into a step-up process and a reinforcement piece fixing process.
- the additional punching process will be described.
- the existing finish is removed.
- a finishing member for example, an outer wall material such as a tile or a painting
- an existing column beam frame 34 composed of the existing column 30 and the existing beam 32 of the existing building 1
- 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.
- 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.
- 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).
- 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.
- 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.
- 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.
- the roughening is performed on the additional hitting planned portion 38 of the existing pillar 30 and the additional hitting planned portion 40 of the existing beam 32.
- 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.
- a sheath tube 60 is installed below the through hole 50 of the balcony slab 36.
- 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.
- 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.
- 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.
- 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.
- 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.
- the additional striking step concrete is driven into a portion of the existing beam 32 to be reinforced to form a beam reinforcing increased portion 64.
- 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.
- anchor drilling is performed on the column reinforcement striking portion 62 and the beam reinforcement striking portion 64.
- anchor holes 68 are formed in the column reinforcing hitting portion 62 and the beam reinforcing hitting portion 64 with a concrete drill.
- 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.
- 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.
- the left I-shaped reinforcement 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. .
- 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.
- 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.
- the L-shaped reinforcing piece 12 is attached.
- the L-shaped reinforcing piece 12 is supported by the support member 76.
- FIG. 10 shows a view of the flange portion 73 ⁇ / b> B of the joint portion 71 and the flange portion 75 ⁇ / b> B of the joint portion 72 as seen through the column reinforcement striking portion 62 from the left side of FIG. 9.
- a hole 81 for anchoring 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.
- 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.
- the L-shaped reinforcing piece 12 on the right side is attached, and the bolts are finally tightened and anchors are fixed.
- 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.
- the bolt is finally tightened through the plate 74 at the joint portion 71 of the left L-shaped reinforcing piece 12 and the joint portion 72 of the left I-shaped reinforcing piece 14.
- 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.
- 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.
- 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.
- 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.
- 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.
- 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.
- the reinforcing unit 10 is preferably constructed integrally because it is possible to increase the strength when it is configured integrally.
- 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.
- 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.
- 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.
- the chemical is cured.
- 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.
- 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.
- an epoxy resin that is an adhesive resin is injected.
- 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.
- the resin part 84 is formed in the three directions of the column reinforcement hitting part 62 and the beam reinforcement hitting part 64.
- epoxy resin is also injected under the base plate 20 of the I-type reinforcing piece 14.
- 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.
- 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. .
- 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.
- the AA cross-sectional view of FIG. 15 is shown in FIG. 16, and the BB cross-sectional view of FIG. 15 is shown in FIG.
- 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.
- 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.
- 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.
- 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.
- 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.
- 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.
- the seismic reinforcement method of this embodiment is completed.
- 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
- 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
- the strength of the existing building 1 can be increased. Toughness can be improved.
- 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
- 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.
- the column reinforcing main bar 52 and the reinforcing band 54 are provided outside the existing column 30 as described above.
- 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.
- 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.
- positions the L-shaped reinforcement piece 12 and the I-type reinforcement piece 14 can be changed suitably.
- 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.
- 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 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.
- 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.
- FIG. 22 is a diagram for explaining the seismic reinforcement method according to Modification 2 of Embodiment 1, and is a schematic front view corresponding to FIG. 15.
- 23 is a cross-sectional view taken along the line FF in FIG. 22, and
- FIG. 24 is a cross-sectional view taken along the line GG corresponding to the vicinity of the connection portion between the L-type reinforcement piece and the I-type reinforcement piece in FIG. is there.
- the beam reinforcing striking portion 64 is provided in contact with the outer surface 33 of the existing beam 32 and the lower surface of the balcony slab 36, and L
- the die reinforcement piece 12 (reinforcement unit 10) is fixed to the lower surface of the beam reinforcement hitting portion 64 via the resin portion 84 by a dimension bolt 82 inserted through the flange portion of the H-shaped steel 22.
- a column reinforcement striking portion 62 is provided in contact with the outer surface 31 of the existing column 30, and the flange portion 75A of the H-shaped steel 22 of the I-type reinforcement piece 14 (reinforcement unit 10) and the L-type reinforcement piece 12 A plate 77 connecting the flanges inside the opening 42 is bolted. Further, the flange portion 75B of the I-shaped reinforcing piece 14 and the plate 79 that connects the flange portion outside the opening 42 of the L-shaped reinforcing piece 12 are bolted. And the I type reinforcement piece 14 is being fixed to the column reinforcement striking part 62 side surface via the resin part 84 with the dimension bolt 82 which penetrated the indoor side (upper side in FIG. 24) of the flange part 75A. .
- 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.
- 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.
- Embodiment 2 that embodies the seismic strengthening method according to the present invention will be described with reference to the drawings, taking Examples 1 and 2 and modifications thereof.
- FIG. 25 is a front view schematically showing a reinforcement unit according to Example 1 in Embodiment 2, and is a view showing a state where the reinforcement pieces are assembled.
- FIG. 26 is a front view of the reinforcing unit shown in FIG. 25, and shows the reinforcing piece in an exploded state.
- the reinforcing unit 110 is connected so as to extend two L-shaped reinforcing pieces 112 composed of two orthogonal sides and one side of each of the two L-shaped reinforcing pieces 112. Two I-shaped reinforcing pieces 114 are provided. And the reinforcement unit 110 is comprised by the portal shape by joining symmetrically so that the front-end
- the reinforcement unit 110 is composed of a so-called steel-concrete reinforcement member in which both the L-type reinforcement piece 112 and the I-type reinforcement piece 114 are made of steel and covered with concrete around the bone.
- FIG. 27 is a cross-sectional view of a reinforcing piece constituting the reinforcing unit according to Example 1 in Embodiment 2, and is a cross-sectional view corresponding to a cross section taken along the line HH and a cross section taken along the line II in FIG. It is.
- the L-shaped reinforcing piece 112 is formed in an L-shape.
- the L-shaped reinforcing piece 112 is a precast concrete member in which an H-shaped steel 122 as a core material and a concrete 123 are integrally formed.
- the H-shaped steel 122 is composed of two sides obtained by welding two steel materials orthogonal to the L-shaped shape, and a plurality of bolt holes 126 are drilled at the ends of the H-shaped steel 122. ing.
- a plurality of headed studs 113 are fixed to the flange portion 173B of the H-shaped steel 122 by welding in two rows at regular intervals.
- the L-shaped reinforcing piece 112 includes an upper side portion 116 fixed by a beam reinforcing increased portion 164, a vertical column portion 118 fixed by a column reinforcing increased portion 162, and orthogonal to the upper side portion 116, (See FIG. 36 and the like).
- a stud missing portion 117 is provided as shown in FIG. 26 in order to avoid interference between the headed stud 113H and the exhaust sleeve 146 of the existing building 101. Yes.
- the I-shaped reinforcing piece 114 is formed in a prismatic shape.
- the I-type reinforcing piece 114 is a precast concrete member in which an H-shaped steel 124 that is a core material and a concrete 125 are integrally formed.
- the H-shaped steel 124 is a straight steel material having one side, and a plurality of bolt holes 126 are drilled in the upper end portion of the H-shaped steel 124.
- a plurality of headed studs 115 are fixed to the flange portion 175B of the H-shaped steel 124 by welding in two rows at regular intervals.
- the I-type reinforcing piece 114 is joined at the upper end to the lower end of the vertical column portion 18 of the L-type reinforcing piece 112 and fixed by the column reinforcing additional portion 162 when performing seismic reinforcement. Further, the I-type reinforcing piece 114 includes a base plate 120 fixed to a balcony slab 136 of the existing building 101, which will be described later, at the lower end, and the base plate 120 abuts on the lower end portion of the H-shaped steel 124 and is fixed by welding. (See FIG. 30 and the like).
- the concrete 123 and 125 covered around the H-shaped steel 122 and 124 is fiber reinforced concrete or the like.
- the height direction dimension (the vertical size in FIG. 26) of the upper side portion 116 is the width direction of the vertical column portion 118. Although it is smaller than the dimension (the size in the left-right direction in FIG. 26), the magnitude relationship between the height-direction dimension and the width-direction dimension is determined according to the seismic reinforcement required for the existing building 101. Is.
- the magnitude relationship between the height direction dimension and the width direction dimension is not particularly limited, for example, the width direction dimension and the height direction dimension may be the same.
- the position and number of the bolt holes 126 provided at the end portions of the H-shaped steels 122 and 124 are not particularly limited.
- the seismic reinforcement method is broadly divided into a reinforcement preparation process, a reinforcement piece assembly process, a column reinforcement arrangement process, a beam reinforcement arrangement process, a reinforcement unit fixing process, and a reinforcement unit finishing process.
- FIG. 28 is a first process diagram in which the existing finish is removed from the existing column and the existing beam at the portion to be hit.
- FIG. 29 is a second process diagram in which drilling and roughening of the anchor hole are performed at the portion to be increased in the existing column and the existing beam.
- an existing column beam frame 134 composed of an existing column 130 and an existing beam 132, and the outside of the existing column 130 excluding the balcony slab 136
- a finishing member for example, an outer wall material such as a tile or a paint
- the outer surface 131 of the existing pillar 130 from which the finishing member has been removed is an increased hitting portion 138.
- a portion of the outer surface 133 that is the outside of the existing beam 132 (the front side in FIG. 28) excluding the lower end side outer surface portion 144 and the peripheral portion of the exhaust sleeve 46 is a balcony slab.
- the finishing member applied to the side close to 136 (the upper end side of the existing beam 132) is removed.
- a portion of the outer surface 133 of the existing beam 132 from which the finishing member has been removed is the additional hitting scheduled portion 140.
- rebar exploration and anchor drilling are performed. Specifically, the reinforcing bars installed in the existing pillar 130 and the existing beam 132 are searched for, and while avoiding these reinforcing bars, as shown in FIG. A plurality of anchor holes 148 are drilled in the additional hitting portions 140 of the beam 132. Further, a through-hole 150 that penetrates the balcony slab 136 in the plate thickness direction (vertical direction in FIG. 29) of the balcony slab 136 is drilled. The through-hole 150 is drilled for inserting an anchor or bolt used to fix the base plate 120 of the I-shaped reinforcing piece 114 to the balcony slab 136.
- a sheath tube 160 is provided at the lower part of the balcony slab 136 so as to communicate with the through hole 150. Then, a fixing bolt 170 described later is inserted through a through hole 150 from a bolt insertion hole (not shown) of the base plate 120 of the I-type reinforcing piece 114 and screwed with a female screw (not shown) provided in the sheath tube 160. . At this time, when the through bolt 70 is disposed inside the through hole 150 and the sheath tube 160, it is preferable that the construction of the reinforcing unit 10 has already been completed on the lower floor.
- the fixing bolt 170 may be a dimensioned bolt used together with an adhesive, or may be fixed by curing the adhesive.
- An anchor may be used instead of the fixing bolt 170 and the female screw.
- the type of the anchor is not particularly limited as long as the base plate 120 of the I-type reinforcing piece 114 can be constructed integrally with the balcony slab 136, such as a hole-in anchor or a chemical anchor.
- the base plate 120 of the I-shaped reinforcing piece 114 may be fixed to the balcony slab 136 with an adhesive, and in this case, the through hole 150 is not necessary.
- roughening is performed on the additional hitting planned portion 138 of the existing pillar 130 and the additional hitting planned portion 140 of the existing beam 132.
- “Roughing” is an operation performed to roughen this surface by forming irregularities on the surface of the old concrete, and to improve the integrity of the surface of the old concrete and the new concrete to be succeeded later.
- FIG. 30 is a process diagram of the reinforcement piece assembling process of the seismic reinforcement method according to Example 1 in the second embodiment, and is a third process chart showing a state in which the left I-shaped reinforcement piece is arranged.
- FIG. 31 is a process diagram subsequent to FIG. 30, and is a fourth process diagram illustrating a state in which the left I-shaped reinforcement piece and the left L-shaped reinforcement piece are to be joined.
- FIG. 32 is a view when the flange portion on the existing column side of the H-shaped steel is viewed from the position indicated by the arrow J in FIG. 31.
- FIG. 33 is a process diagram subsequent to FIG.
- FIG. 31 is a fifth process diagram showing a state in which the right I-shaped reinforcement piece is arranged after joining the left I-shaped reinforcement piece and the left L-shaped reinforcement piece.
- FIG. 34 is a process diagram following FIG. 33, in which the right L-shaped reinforcing piece is joined to the right I-shaped reinforcing piece and the left L-shaped reinforcing piece joined to the left I-shaped reinforcing piece, respectively. It is a 6th process figure which shows a mode to do.
- the reinforcement piece assembling process is a process of arranging a pair of I-type reinforcement pieces 114 at positions along the existing pillars 130 on the outside of the existing pillars 130 (on the front side in FIG. 30 and on the outdoor side of the existing building 101).
- a pair of L-shaped reinforcing pieces 112 are arranged at positions along the existing pillars 130 and the existing beams 132 on the outside of the beam 132 (on the front side of the paper in FIG. 30 and on the outdoor side of the existing building 101).
- the piece 114 and the pair of L-shaped reinforcing pieces 112 are assembled.
- the left-side I-shaped reinforcing piece 114 is arranged and installed at a position along the left-side existing column 130 of the existing column beam frame 134. Specifically, as shown in FIG. 30, among the existing pillar 130 on the left side, the side surface facing the opening 142 (the right side surface in FIG. 30) and the flange of the H-shaped steel 124 of the I-type reinforcing piece 114 The I-type reinforcing piece 114 is moved to the existing pillar 130 on the left side and the base plate 120 of the I-type reinforcing piece 114 is placed on the balcony slab 136 until the portion 175B is flush with the portion 175B. The fixing bolt 170 is inserted into the base plate 120 and the through hole 150 and temporarily tightened, whereby the I-type reinforcing piece 114 is installed.
- the left L-shaped reinforcing piece 112 is disposed above the left I-shaped reinforcing piece 114 at a position along the existing pillar 130 on the left side of the existing column beam frame 134 and the existing piece.
- the beam 132 is placed on the left side of the beam 132 and installed.
- the side surface facing the opening 142 (the right side surface in FIG. 30) and the H-shaped steel 122 of the left L-shaped reinforcing piece 112.
- the L-shaped reinforcing piece 112 is arranged close to the existing pillar 130 on the left side until the flange portion 173B is flush with the flange portion 173B.
- the support member 176 supports the space between the upper side portion 116 of the L-shaped reinforcing piece 112 and the balcony slab 136 on the floor side.
- the joint portion 171 and the joint portion 172 are joined together by the plate 174, and the plate 174 and the joint portion 171 are joined together. And the plate 174 and the joint portion 172 are each temporarily tightened with bolts. Further, the flange portion 173A of the joint portion 171 and the flange portion 175A of the joint portion 172 are connected by a plate 177, and the plate 177 and the flange portion 173A, and the plate 177 and the flange portion 175A are respectively bolted. Tighten temporarily.
- the flange portion 173B of the joint portion 171 and the flange portion 175B of the joint portion 172 are joined together by a plate 179, and the plate 179 and the flange portion 173B and the plate 179 and the flange portion 175B are temporarily attached with bolts. Tighten.
- the plate 179 is arrange
- the right I-shaped reinforcing piece 114 is disposed and installed at a position along the existing pillar 130 on the right side of the existing column beam frame 134. Specifically, as shown in FIG. 33, of the existing pillar 130 on the right side, the side surface facing the opening 142 (the left side surface in FIG. 33) and the flange of the H-shaped steel 124 of the I-type reinforcing piece 114 The I-type reinforcement piece 114 is brought to the existing pillar 130 on the right side until the portion 175B is flush with the base plate 120, and the base plate 120 of the I-type reinforcement piece 114 is placed on the balcony slab 136. The fixing bolt 170 is inserted into the base plate 120 and the through hole 150 and temporarily tightened, whereby the I-type reinforcing piece 114 is installed.
- the right L-shaped reinforcing piece 112 is arranged above the right I-shaped reinforcing piece 114 at a position along the existing pillar 130 on the right side of the existing column beam frame 134 and the existing beam. It is arranged near the right side of 132. Specifically, as shown in FIG. 34, of the existing pillar 130 on the right side, the side surface facing the opening 142 (the right side surface in FIG. 34) and the H-shaped steel 122 of the L-shaped reinforcing piece 112 on the right side. The L-shaped reinforcing piece 112 is arranged close to the existing pillar 130 on the right side until the flange portion 173B is flush with the flange portion 173B. At this time, the support member 176 supports the upper side portion 116 of the right L-shaped reinforcing piece 112 and the balcony slab 136 on the floor side.
- the plate 174, the joint portion 171 and the plate 174 is joined by tightening a bolt.
- the plate 177 and the flange portion 173A, and the plate 177 and the flange portion 175A are joined by fastening the bolts.
- the plate 179 and the flange portion 173B, and the plate 179 and the flange portion 175B are joined by tightening the bolts.
- the joint portion 171 and the joint portion 172 are joined by the plate 174, and the plate 174 and the joint are joined.
- the part 171 and the plate 174 and the joint part 172 are joined by tightening the bolts.
- the flange portion 173A of the joint portion 171 and the flange portion 175A of the joint portion 172 are connected by a plate 177, and the plate 177 and the flange portion 173A, and the plate 177 and the flange portion 175A are respectively bolted. Tighten and join.
- the flange portion 173B of the joint portion 171 and the flange portion 175B of the joint portion 172 are connected by the plate 179, and the plate 179 is connected. And the flange portion 173B, and the plate 179 and the flange portion 175B are joined by tightening the bolts.
- the joint portion 178 of the H-shaped steel 122 of the left L-shaped reinforcing piece 112 and the joint portion 178 of the H-shaped steel 122 of the right L-shaped reinforcing piece 112 are connected by a plate 180. The two joint portions 178 are finally tightened with bolts and joined via the plate 180. Further, in the I-type reinforcement pieces 114 on the left and right sides, the fixing bolts 170 are finally tightened to fix the I-type reinforcement pieces 114.
- the L-shaped reinforcement pieces 112 on the left and right sides and the I-type reinforcement pieces 114 on the left and right sides are assembled in a gate shape and formed as the reinforcement unit 110.
- the headed stud 113V of the L-shaped reinforcing piece 112 and the headed stud 115 of the I-shaped reinforcing piece 114 are opposed to the planned hitting portion 138 of the existing column 130.
- the headed stud 113 ⁇ / b> H of the L-shaped reinforcing piece 112 is arranged at a position facing the additional hitting planned portion 140 of the existing beam 132.
- the column reinforcing main reinforcement 152 and the reinforcement strip 154 are arranged in the column reinforcing arrangement step.
- anchoring and anchoring for arranging the beam reinforcing main bar 156 and the reinforcing bar 158 in the beam reinforcing bar arrangement process cannot be performed. In order to avoid this, care must be taken in determining the drilling position of the anchor hole 148.
- a welding structure can be considered in addition to the bolt fastening.
- the reinforcement unit 110 itself can be strengthened if the reinforcement unit 110 itself is integrally formed. Rather than having a structure, it is preferable to mechanically join.
- a welding machine and a power source are required at the site of seismic reinforcement work, so there are problems such as extra costs, and it is difficult to ensure safety because welding uses fire. Since there is a possibility that it may occur, the advantage is that it can be easily fastened with a bolt or the like.
- FIG. 36 is a process diagram subsequent to FIG. 35, and is an eighth process diagram for explaining the column reinforcement placement process and the beam reinforcement placement process of the seismic strengthening method according to Example 1 in the second embodiment.
- the column reinforcement main reinforcement 152 is arranged on the outer surface 131 side of the existing column 130 so that the stud 113V is provided inside, and the column reinforcement reinforcement 155 is formed by winding the reinforcement reinforcement bars 154 perpendicular to the column reinforcement main reinforcement 152.
- the beam reinforcing main reinforcement 156 is arranged on the outer surface 133 side of the existing beam 132 so that the headed stud 113H of the upper side portion 116 along the existing beam 132 of the pair of L-shaped reinforcing pieces 112 is internally provided.
- the beam reinforcing bar 159 is formed by winding the reinforcing bar 158 so as to be orthogonal to the beam reinforcing main bar 156.
- various reinforcing bars are arranged in a plurality of anchor holes 148 drilled in the additional hitting planned portion 138 of the existing column 130 and the additional hitting planned portion 140 of the existing beam 132.
- a column reinforcement main reinforcing bar 152 (reinforcing bar) arranged in parallel to the existing column 130 and a reinforcing bar wound in a direction perpendicular to the column reinforcing main reinforcing bar 152 are provided in the additional hitting portion 138.
- a reinforcing band 154 is arranged.
- a beam reinforcement main bar 156 (reinforcing bar) arranged in parallel with the existing beam 132 and a reinforcing bar 158 wound in a direction perpendicular to the beam reinforcement main bar 156 are arranged in the additional hitting planned portion 140.
- FIG. 37 is a process diagram subsequent to FIG. 36, and is a ninth process diagram illustrating a reinforcement unit fixing process of the earthquake-proof reinforcement method according to Example 1 in Embodiment 2.
- the headed stud 113V of the L-shaped reinforcing piece 112 and the headed stud 115 of the I-shaped reinforcing piece 114 are added to the column reinforcing hitting portion 162, and the headed stud 113H of the L-shaped reinforcing piece 112 is changed to the beam reinforcing hitting portion.
- 164 is fixed in a state of being installed inside. Therefore, the reinforcing unit 110 can be fixed to the column reinforcing hitting portion 162 and the beam reinforcing hitting portion 164 without using anchoring or an adhesive.
- the exhaust sleeve 146 is disposed on the existing beam 132.
- the beam reinforcement striking portion 164 includes a space portion 166 at a location corresponding to the portion where the exhaust sleeve 146 is disposed. That is, by providing the space portion 166 at a position corresponding to the position where the exhaust sleeve 146 is disposed, the beam reinforcing increased portion 164 is formed avoiding the exhaust sleeve 146.
- FIG. 39 is a process diagram subsequent to FIG. 38, and is an eleventh process diagram showing a state where the seismic reinforcement work has been completed by surface finishing the reinforcing unit and the additional hitting portion.
- a cross-sectional view is shown in FIG. However, in FIG. 41, in order to make the drawing easier to see, the beam reinforcement main reinforcing bar and the reinforcing reinforcing bar in the beam reinforcing bar arrangement portion are omitted.
- the beam reinforcing increased portion 164 placed on the beam reinforcing bar 159 is brought close to the upper end side (the upper side in FIG. 41) of the existing beam 132 and is in contact with the lower surface of the balcony slab 136 and the outer surface 133 of the existing beam 132.
- the height H3 of the beam reinforcing striking portion 164 is smaller than the height (beam length) H1 of the existing beam 132.
- the height H3 of the beam reinforcing increased portion 164 is smaller than the height H2 of the lower portion of the existing beam 132 from the balcony slab 136, and the height H3 of the beam reinforcing increased portion 164 is the existing height.
- the height of the beam 132 is equal to or less than 1 ⁇ 2 of the beam height H1.
- the protruding amount h1 is a size that hardly influences the habitability, the functionality, and the daylighting property for a person inside the existing building 101.
- FIG. 38 is a process diagram subsequent to FIG. 37, and is a tenth process diagram illustrating a state in which a joint portion connecting reinforcement pieces is filled with grout.
- the grout 188 is injected and the surface of the reinforcing unit 110 is finished.
- the vertical column joining portion 128 of the L-type reinforcement piece 112 and the I-type reinforcement piece 114 (see FIG. 37).
- a grout 188 is injected into the upper side joint portion 127 (see FIG. 37) between the L-shaped reinforcing pieces 112 and the support portions 186 at the lower ends of the left and right I-shaped reinforcing pieces 114.
- the grout 188 is made of fiber reinforced grout in order to increase the strength of the reinforcing unit 110.
- the grout 188 may be made of non-shrink mortar.
- surface finishing is performed. Specifically, as shown in FIG. 39, finishing of the outer wall is performed by attaching or painting a finishing member on the surfaces of the column reinforcing hitting portion 162, the beam reinforcing hitting portion 164, and the reinforcing unit 110. .
- the seismic reinforcement work by the seismic reinforcement method of this embodiment is completed.
- the column reinforcement striking portion 162, the beam reinforcement striking portion 164, and the reinforcement unit 110 are finished inconspicuously. I don't mind being a building.
- FIG. 40 is a cross-sectional view taken along arrow KK in FIG.
- FIG. 42 is an explanatory view showing a first case in the second embodiment in which the position where the reinforcing unit according to the first embodiment is arranged on the existing column beam frame is changed.
- FIG. 43 is an explanatory diagram of the same case as FIG. 42, and is a cross-sectional view corresponding to the LL arrow position in FIG. FIG.
- FIG. 44 is an explanatory diagram showing a second case in which the position where the reinforcing unit according to Example 1 is arranged on the existing column beam frame is changed in the second embodiment, and is a position taken along the arrow KK in FIG. FIG. 40 to 44, in order to make the drawings easier to see, the column reinforcing main bar and the reinforcing bar of the column reinforcing bar arrangement and the beam reinforcing main bar and the reinforcing bar of the beam reinforcing bar are omitted. It is illustrated as follows.
- the column reinforcement increased portion 162 is a surface of the outer surface 131 of the existing column 130.
- the I-shaped reinforcing piece 114 is formed only on the upper side, and is disposed with a gap from the outer surface 131 in the depth direction of the existing pillar 130 (the vertical direction in FIG. 40). As shown in FIG.
- the beam reinforcing striking portion 164 is formed in contact with the lower surface of the balcony slab 136 and the outer surface 133 of the existing beam 132, and the L-shaped reinforcing piece 112 is formed in the depth direction of the existing beam 132 (in FIG. 41). In the left-right direction) with a gap from the outer surface 133. And the I type reinforcement piece 114 and the L type reinforcement piece 112 which were arrange
- the existing outer surface 133 of the existing beam 132 is located on the indoor side (upper side in FIG. 42) in the depth direction of the existing column 130 (vertical direction in FIG. 42) from the outer surface 131 of the existing column 130.
- the column reinforcement striking portion 162 is formed only on the outer surface 131 of the existing column 130.
- a plurality of headed studs 115 are arranged in a single row at a predetermined pitch interval, and the flange portion 175B (H-shaped steel 122) of the H-shaped steel 124 is used.
- the pitch interval between the adjacent head studs 115 is, for example, 1/1 compared to the case where the head studs 115 (head studs 113V) are arranged in two rows as described above.
- the pitch is smaller, such as a pitch of 2 or less.
- the beam reinforcement increasing portion 164 is formed in contact with the lower surface of the balcony slab 136 and the outer surface 133 of the existing beam 132, and the L-shaped reinforcing piece 112 is formed on the outer surface 133 of the existing beam 132. It is arrange
- the outer surface 133 of the existing beam 132 is located on the indoor side (upper side in FIG. 44) of the existing column 130 in the depth direction of the existing column 130 (vertical direction in FIG. 44), and the outer surface of the existing beam 132
- there is a restriction such as a small protrusion of the balcony slab 136 from 133 to the outdoor side (left side in FIG. 43).
- the column reinforcement striking portion 162 is not provided as shown in FIG.
- the I-type reinforcement piece 114 (the vertical column portion 118 of the L-type reinforcement piece 112) is a portion of the column reinforcement increased hitting portion 162 that is not opposed to the outer surface 131 of the existing column 130, and is a headed stud 115. (Headed stud 113V) is fixed inside.
- the seismic reinforcement method of the first embodiment is a method of seismically reinforcing an existing column beam frame 134 constructed from an existing column 130 and an existing beam 132 with respect to the existing building 101 by the reinforcing unit 110, and a pair of L
- the seismic reinforcement method of assembling the gate-type reinforcement unit 110 by combining the mold reinforcement piece 112 and the pair of I-type reinforcement pieces 114 the pair of L-type reinforcement pieces 112 and the pair of I-type reinforcement pieces 114 include The studs 113 and 115 are provided, and a pair of I-shaped reinforcement pieces 114 are arranged along the existing pillar 132 outside the existing pillar 130, and a pair of L-shaped reinforcement is provided outside the existing beam 132.
- the beam reinforcing main bar 156 is arranged outside the existing beam 132 so that the stud 113H (113) of the upper side portion 116 along the existing beam 132 of the pair of L-shaped reinforcing pieces 112 is provided inside.
- the beam reinforcing barbing step 159 is formed by winding the reinforcing bar 158 perpendicularly to the beam reinforcing main bar 156, and the beam reinforcing barbing part 155 is placed to hit the existing column 130.
- a reinforcing piece fixing step for fixing the reinforcing unit 110 by placing the existing beam 132 on the reinforcing bar 159 and hitting the existing beam 132.
- the seismic reinforcement method of the first embodiment the impact on the habitability, functionality, and lighting of the existing building 101 after the reinforcement can be sufficiently reduced, and the cost of the seismic reinforcement work can be suppressed. , Has an excellent effect.
- the beam reinforcing increased portion 164 provided in the beam reinforcing bar arrangement portion 159 is provided close to the upper end side of the existing beam 132 (side adjacent to the balcony slab 136). Since the height H3 of the beam reinforcing increased portion 164 is smaller than the height H1 of the existing beam 132, the opening area of the opening 142 of the existing column beam frame 134 is made smaller by the reinforcing unit 110. Can be reliably suppressed, and the influence on habitability, functionality, and lighting can be sufficiently suppressed.
- the opening 142 of the existing column beam frame 134 serves as an indoor / outdoor entrance / exit of the existing building 101, it is difficult for people to enter and exit even after the existing building 101 is reinforced. Moreover, it can suppress that the sunlight taken in into the room
- the seismic reinforcement method of the first embodiment is characterized in that the height H3 of the beam reinforcement striking portion 164 is 1 ⁇ 2 or less of the beam length H1 of the existing beam 132.
- the upper side portion 116 that is one side (one side of the reinforcing unit) along the existing beam 132 of the pair of L-shaped reinforcing pieces 112 is an opening of the existing column beam frame 134 from the lower surface of the existing beam 132 on the upper beam side. The amount h1 of protrusion toward the portion 142 can be suppressed.
- the existing building 101 is an apartment house, and the existing beam structure (existing column beam frame 134) at the boundary between the veranda and the room has a large span in the direction of the existing beam 132.
- earthquake-proof reinforcement is applied to a building, the influence on the habitability, functionality, and daylighting by the reinforcing unit 110 is suppressed to a small extent, and the existing building 101 can be effectively earthquake-proofed.
- seismic reinforcement technology that can sufficiently ensure such amenity, functionality, and daylighting as customer needs from residents of apartment houses, etc. Can fully meet such customer needs.
- the beam reinforcing increased portion 164 includes the space portion 166 at a position corresponding to the portion where the exhaust sleeve 146 is disposed.
- the sleeve 146 is not blocked by the beam reinforcement striking portion 164, and can maintain the function of exhausting the exhaust from the room of the existing building 101 to the outside through the exhaust sleeve 164, and the functionality of the existing building 101 is maintained. Is done.
- the portion where the exhaust sleeve 146 is disposed is very limited in size, even if there is a portion that is not increased by the space portion 166, a part of the beam reinforcement increased portion 164 exists.
- the existing building 101 that has been seismically reinforced by the reinforcing unit 110 can ensure sufficient seismic strength.
- the pair of L-shaped reinforcing pieces 112 and the pair of I-shaped reinforcing pieces 114 are precasts in which H-shaped steels 122 and 124, which are core materials, and concrete 123 and 125 are integrally molded. It is a concrete member, and the headed studs 113 and 115 are fixed to the H-shaped steels 122 and 124. Therefore, if the stud is fixed to the steel material at the seismic reinforcement site of the existing building 101, the space is increased. , There are many restrictions and the stud fixing work cannot be performed efficiently.
- the productivity of the stud fixing is improved, so the cost of the reinforcing unit 110 can be reduced.
- the productivity of the stud fixing is improved, so the cost of the reinforcing unit 110 can be reduced.
- the productivity of the stud fixing is improved, so the cost of the reinforcing unit 110 can be reduced.
- the headed studs 113 and 115 are welded to the H-shaped steels 122 and 124, so that it is not necessary to place a qualified person of welding technology on the seismic reinforcement site of the existing building 101.
- the seismic reinforcement method of Example 1 does not require any of the above-mentioned certain required times, unlike the adhesive bonding method that requires a certain amount of time to reach the strength of the adhesive. Therefore, if the headed studs 113 and 115 are fixed to the H-shaped steels 122 and 124 in advance at the factory, the stud-attached reinforcing pieces carried into the seismic reinforcement site, that is, the L-shaped reinforcing piece 112 and the I-shaped reinforcing piece 114 are used. On the other hand, since preparations for the next reinforcement piece assembly process can be started immediately, it is possible to contribute to shortening the construction period of the seismic reinforcement work.
- the reinforcement unit 110 is configured by assembling the reinforcement pieces divided into the L-type reinforcement piece 112 and the I-type reinforcement piece 114, the L-type reinforcement piece 112 and the I-type reinforcement piece 114 are the existing buildings. 101, it is easy to carry in to the seismic reinforcement site, and the necessity to secure the carrying path for the special L-shaped reinforcing piece 112 and the I-shaped reinforcing piece 114 is kept low.
- Example 2 As Example 2 of Embodiment 2, as shown in FIG. 45, the existing beam 132 is not formed with the exhaust sleeve 146 (see FIG. 39), and the beam reinforcing increased portion 164 has a space 166. Embodiments that do not form can also be considered. According to this Example 2, in addition to the effect of Example 1 mentioned above, the effect which further improves seismic strength can be acquired. In the seismic reinforcement method of the second embodiment, since the reinforcing unit 110 has a rigid and strong structure, particularly the horizontal strength of the existing structure is improved, and the seismic strength of the existing building 101 is further improved.
- the reinforcing unit 110 may be shaped as shown in FIG. In the modification shown in FIG. 46, the L-shaped reinforcing piece 112 is thickened on the inner side of the L-shape, and the width of the L-shaped reinforcing piece 112 in the direction parallel to the existing pillar 130 (vertical direction in FIG. 46) is increased. is doing.
- first embodiment has been described with reference to the first and second embodiments and the first and second modifications
- second embodiment has been described with the first and second embodiments and the modification.
- the first and second embodiments are merely examples, and the present invention is not limited to the first and second embodiments, and can be appropriately modified and applied without departing from the gist thereof.
- the reinforcement units 10 and 110 are configured in a gate shape, but the shape of the reinforcement unit may be a square frame shape.
- the number of studs, the arrangement position, and the interval (pitch) between adjacent studs are limited to the arrangement positions exemplified in the second embodiment. It is not a thing and can be changed suitably.
- the earthquake resistance is improved and the opening area in the opening in the existing column beam frame is improved.
- existing buildings after seismic reinforcement can be provided in which the habitability, functionality, and daylighting performance are further improved compared to conventional seismic reinforcement methods.
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Abstract
Description
<実施例1>
まず、実施例1について説明する。そこで、まず、補強ユニット10について説明する。ここで、図1は、補強ユニット10の概略正面を示した図である。また、図2は、補強ユニット10を構成する補強ピースの概略正面図である。
まず、増し打ち工程について説明する。この増し打ち工程では、まず、既設仕上げ撤去を行う。具体的には、図3に示すように、既存建築物1の既存柱30と既存梁32とから構成される既存柱梁フレーム34の仕上げ部材(例えば、タイルなどの外壁材や塗装など)を撤去する。さらに詳しくは、既存柱30について、外側(図3の紙面手前側)の面にてバルコニースラブ36を除いた部分の増し打ち予定部38における仕上げ部材を撤去する。また、既存梁32について、外側(図3の紙面手前側)の面にて、増し打ち予定部40における仕上げ部材を撤去する一方で、既存柱梁フレーム34の開口部42側の部分44と排気用スリーブ46の周辺の部分における仕上げ部材は撤去しない。ここで、増し打ち予定部40とは、既存梁32において、バルコニースラブ36側にある部分であって、排気用スリーブ46の周辺を除いた部分である。
次に、補強ピース固定工程について説明する。この補強ピース固定工程では、まず、柱補強増打部62と梁補強増打部64にアンカー穿孔を行う。具体的には、図7に示すように、柱補強増打部62と梁補強増打部64にコンクリートドリルでアンカー用の孔68を形成する。図7に示す例においては、左右の柱補強増打部62と、梁補強増打部64とに各々、4つのアンカー用の孔68を形成しているが、アンカー用の孔68の数は特に限定されない。また、このとき、貫通孔50とシース管60の内部に貫通ボルト70を配置する。なお、このとき、下の階にて既に補強ユニット10の施工が完了していることが好ましい。
また、実施例2として、図20に示すように、既存梁32に排気用スリーブ46が形成されておらず、梁補強増打部64に前記の空間部66を形成していない実施例も考えられる。この実施例2によれば、前記の実施例1の効果に加えて、耐震強度をさらに向上させる効果を得ることができる。
その他、変形例1として、補強ユニット10を図21に示すような形状にしてもよい。図21に示す変形例では、L型補強ピース12について、そのL字の内側を肉厚とし、既存柱30に平行な方向(図21の上下方向)のL型補強ピース12の幅を大きくしている。
図22は、実施形態1のうちの変形例2に係る耐震補強工法を説明する図であり、図15に相当する概略正面図である。図23は、図22のF-F矢視断面図であり、図24は、図22中、L型補強ピースとI型補強ピースとの接続部付近に相当するG-G矢視断面図である。
以上のような本発明の耐震補強工法により補強した建築物について、水平載荷試験を行って、その耐震強度の評価を行った。当該評価は、本発明の耐震補強工法を施工していない既存建築物1と同等な構造からなる既存構造試験体と、本発明の耐震補強工法を施工した前記の実施例1と同等な構造からなる第1構造試験体と、本発明の耐震補強工法を施工した前記の実施例2と同等な構造からなる第2構造試験体と、を使用して行った。
次に、本発明に係る耐震補強工法を具体化した実施形態2を、実施例1,2と、その変形例とを挙げて図面を参照して説明する。
まず、本発明に係る耐震補強工法に用いる補強ユニットについて説明する。図25は、実施形態2のうち、実施例1に係る補強ユニットを概略的に示す正面図であり、補強ピースが組み立てられた状態で示す図である。図26は、図25に示す補強ユニットの正面図であり、補強ピースが分解された状態で示す図である。
はじめに、増し打ち準備工程について、図28及び図29を用いて説明する。増し打ち準備工程は、まず増し打ち予定部における既設仕上げを撤去し、鉄筋探査やアンカー穿孔等を行った後、撤去した既設仕上げ部分の目荒らしを行う。図28は、既存柱及び既存梁において、増し打ち予定部で既設仕上げの撤去を行う第1工程図である。図29は、既存柱及び既存梁において、増し打ち予定部でアンカー孔の穿孔と目荒らしを行う第2工程図である。
次に、本発明の補強ピース組立工程について、図30~図34を用いて説明する。図30は、実施形態2のうち、実施例1に係る耐震補強工法の補強ピース組立工程の工程図であり、左側のI型補強ピースを配置した様子を示す第3工程図である。図31は、図30に続く工程図であり、左側のI型補強ピースと左側のL型補強ピースとを接合しようとする様子を示す第4工程図である。図32は、図31中、J矢視位置からH型鋼の既存柱側のフランジ部を見たときの図である。図33は、図31に続く工程図であり、左側のI型補強ピースと左側のL型補強ピースとを接合した後、右側のI型補強ピースを配置した様子を示す第5工程図である。図34は、図33に続く工程図であり、右側のL型補強ピースを、右側のI型補強ピースと、左側のI型補強ピースと接合した左側のL型補強ピースとに、それぞれ接合しようとする様子を示す第6工程図である。
次に、本発明の柱補強配筋工程及び梁補強配筋工程について、図36を用いて説明する。柱補強配筋工程と梁補強配筋工程とは、補強ピース組立工程後に行われる。図36は、図35に続く工程図であり、実施形態2のうち、実施例1に係る耐震補強工法の柱補強配筋工程及び梁補強配筋工程を説明する第8工程図である。
次に、本発明の補強ユニット固定工程について、図37を用いて説明する。柱補強配筋工程、及び梁補強配筋工程の後、補強ユニット固定工程が行われる。補強ユニット固定工程は、柱補強配筋部155に打設して既存柱130の増し打ち予定部138を増し打ちすると共に、梁補強配筋部159に打設して既存梁132の増し打ち予定部140を増し打ちすることにより、補強ユニット110を固定する。図37は、図36に続く工程図であり、実施形態2のうち、実施例1に係る耐震補強工法の補強ユニット固定工程を説明する第9工程図である。
次に、補強ユニット仕上げ工程について、図37~図39を用いて説明する。図38は、図37に続く工程図であり、補強ピース同士を繋ぐ継手部をグラウトで埋めた様子を示す第10工程図である。補強ユニット仕上げ工程では、グラウト188の注入と補強ユニット110の表面仕上げを行う。
図40及び図41に示すように、既存柱130の外面131と既存梁132の外面133とが面一の既存柱梁フレーム134では、柱補強増打部162が既存柱130の外面131の面上のみに形成され、I型補強ピース114が、既存柱130の奥行方向(図40中、上下方向)に外面131と隙間を持って配設されている。梁補強増打部164が、図41に示すように、バルコニースラブ136の下面と既存梁132の外面133に接して形成され、L型補強ピース112が、既存梁132の奥行方向(図41中、左右方向)に外面133と隙間を持って配設されている。そして、このような位置に配設されたI型補強ピース114とL型補強ピース112とが、それぞれ2つ門型形状に接合されている。
図42に示すように、既存梁132の外面133が、既存柱130の奥行方向(図42中、上下方向)に、既存柱130の外面131より屋内側(図42中、上側)にある既存柱梁フレーム134では、柱補強増打部162が既存柱130の外面131の面上のみに形成される。ここで用いるI型補強ピース114(L型補強ピース112)では、頭付スタッド115(頭付スタッド113V)が複数、所定ピッチ間隔で単列状に、H型鋼124のフランジ部175B(H型鋼122のフランジ部173B)に溶接で固着されている。但し、隣り合う頭付スタッド115(頭付スタッド113V)のピッチ間隔が、前述したように、頭付スタッド115(頭付スタッド113V)を2列状に配設する場合に比べ、例えば、1/2以下のピッチ等、小さくなっている。柱補強増打部162との一体的な強度を十分に得るためである。その一方で、梁補強増打部164が、図43に示すように、バルコニースラブ136の下面と既存梁132の外面133に接して形成され、L型補強ピース112が、既存梁132の外面133に近接して配設されている。そして、このような位置に配設されたI型補強ピース114とL型補強ピース112とが、それぞれ2つ門型形状に接合されている。
既存梁132の外面133が、既存柱130の奥行方向(図44中、上下方向)に、既存柱130の外面131より屋内側(図44中、上側)に位置すると共に、既存梁132の外面133から屋外側(図43中、左側)にバルコニースラブ136のせり出しが小さい等の制約がある場合がある。この場合には、柱補強増打部162を配設するのにあたり、既存柱130の外面131からの奥行が十分にとれないため、図44に示すように、柱補強増打部162は、既存柱130の外面131の面上以外に、既存柱130の開口部側内面130aより開口部142(図39参照)内側に向けてせり出すと共に、既存梁132の外面133側(屋内側)にもせり出す形態で形成される。そして、I型補強ピース114(L型補強ピース112の縦柱部118)が、この柱補強増打部162のうちの、既存柱130の外面131に対向していない部分で、頭付スタッド115(頭付スタッド113V)を内設させて固定される。
また、実施形態2のうちの実施例2として、図45に示すように、既存梁132に排気用スリーブ146(図39参照)が形成されておらず、梁補強増打部164に空間部166を形成していない実施例も考えられる。この実施例2によれば、前述した実施例1の効果に加えて、耐震強度をさらに向上させる効果を得ることができる。実施例2の耐震補強工法では、補強ユニット110が、剛性の高い強固な構造となるため、特に既存構造物の水平方向の耐力が向上し、既存建築物101の耐震強度がさらに向上する。
その他、実施形態2のうちの実施例1,2の変形例として、補強ユニット110を図46に示すような形状にしても良い。図46に示す変形例では、L型補強ピース112について、そのL字の内側を肉厚とし、既存柱130に平行な方向(図46中、上下方向)のL型補強ピース112の幅を大きくしている。
10,110 補強ユニット
12,112 L型補強ピース
113,113H,113V,115 頭付スタッド(スタッド)
14,114 I型補強ピース
116 上辺部(既存柱に沿う一辺)
122,124 H型鋼(鋼材)
123,125 コンクリート
30,130 既存柱
131 外面(既存柱の外側)
32,132 既存梁
133 外面(既存梁の外側)
34,134 既存柱梁フレーム
36 バルコニースラブ
38 増し打ち予定部
40 増し打ち予定部
42 開口部
46,146 排気用スリーブ
62 柱補強増打部
64,164 梁補強増打部
66,166 空間部
84 樹脂部
152 柱補強主筋
154 補強帯筋
155 柱補強配筋部
156 梁補強主筋
158 補強肋筋
159 梁補強配筋部
H,H1 既存梁の高さ(既存梁の梁せい)
H3 梁補強増打部の高さ
h (梁補強増打部の)高さ
Claims (8)
- 既存建築物の既存柱と既存梁から構成される既存柱梁フレームを補強するユニットにより耐震補強する工法であって、一対のL型補強ピースと、一対のI型補強ピースとボルトで結合させて門型の補強ユニットを組み立てる耐震補強工法において、
前記既存柱の外側に、柱に平行に配置される柱補強主筋と、前記柱補強主筋の直交方向に巻かれる補強帯筋とを内設した柱補強増打部をアンカーにより増し打ちする柱増し打ち工程と、
前記既存梁の外側に、梁と平行に配置される梁補強主筋と、前記梁補強主筋の直交方向に巻かれる補強肋筋とを内設した梁補強増打部をアンカーにより増し打ちする梁増し打ち工程と、
前記柱補強増打部と前記梁補強増打部に対して、前記一対のL型補強ピースと前記一対のI型補強ピースとをアンカー止めし、前記柱補強増打部と前記梁補強増打部と、前記一対のL型補強ピースと前記一対のI型補強ピースとの間に接着用樹脂を注入する補強ピース固定工程と、を有すること、
を特徴とする耐震補強工法。 - 請求項1に記載する耐震補強工法において、
前記梁補強増打部は、排気用スリーブが配設されている部位に対応する箇所に空間部を備えること、
を特徴とする耐震補強工法。 - 請求項1または請求項2に記載する耐震補強工法において、
前記梁補強増打部の高さを前記既存梁の高さよりも小さくすること、
を特徴とする耐震補強工法。 - 既存建築物に対し、既存柱と既存梁とから構築される既存柱梁フレームを、補強ユニットにより耐震補強する工法であって、一対のL型補強ピースと、一対のI型補強ピースとを結合させて門型の補強ユニットを組み立てる耐震補強工法において、
前記一対のL型補強ピースと前記一対のI型補強ピースには、スタッドがそれぞれ設けられていること、
前記既存柱の外側で、前記一対のI型補強ピースを前記既存柱に沿って配置すると共に、前記既存梁の外側で、前記一対のL型補強ピースを前記既存柱と前記既存梁に沿って配置し、前記一対のI型補強ピースと前記一対のL型補強ピースとを組み立てる補強ピース組立工程と、
前記補強ピース組立工程後、前記一対のI型補強ピースの前記スタッドと、前記一対のL型補強ピースのうち、前記既存柱に沿う一辺の前記スタッドとが内設するよう、柱補強主筋を前記既存柱の外側に配筋し、前記柱補強主筋に補強帯筋を直交させて巻いた柱補強配筋部を形成する柱補強配筋工程と、
前記一対のL型補強ピースのうち、前記既存梁に沿う一辺の前記スタッドが内設するよう、梁補強主筋を前記既存梁の外側に配筋し、前記梁補強主筋に補強肋筋を直交させて巻いた梁補強配筋部を形成する梁補強配筋工程と、
前記柱補強配筋部に打設して前記既存柱を増し打ちすると共に、前記梁補強配筋部に打設して前記既存梁を増し打ちすることにより、前記補強ユニットを固定する補強ユニット固定工程と、を有すること、
を特徴とする耐震補強工法。 - 請求項4に記載する耐震補強工法において、
前記梁補強配筋部に打設された梁補強増打部は、前記既存梁の上端側に寄せて設けられ、前記梁補強増打部の高さが、前記既存梁の高さより小さいこと、
を特徴とする耐震補強工法。 - 請求項5に記載する耐震補強工法において、
前記梁補強増打部の高さは、前記既存梁の梁せいの1/2以下の高さであること、
を特徴とする耐震補強工法。 - 請求項5または請求項6に記載する耐震補強工法において、
前記梁補強増打部は、排気用スリーブが配設されている部位に対応する箇所に空間部を備えること、
を特徴とする耐震補強工法。 - 請求項4乃至請求項7のいずれか1つに記載する耐震補強工法において、
前記一対のL型補強ピースと前記一対のI型補強ピースは何れも、心材である鋼材と、コンクリートとを一体成形したプレキャストコンクリート部材であり、前記スタッドは前記鋼材に固着されていること、
を特徴とする耐震補強工法。
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