JPH1162266A - Aseismatic reinforcing method of existing building - Google Patents

Abstract

PROBLEM TO BE SOLVED: To greatly increase the shear capacity without reducing the convenience of an existing building. SOLUTION: A steel reinforcement column 11 provided so as to cover the periphery of an existing column 2, and a reinforcement beam 12 is constructed by connecting an on-floor beam member 12A arranged on the upper side of an existing floor 4 on the existing beam 3 to an under-floor beam member 12B arranged on the lower side thereof by a connection member b1 piercing the existing floor 4. An on-floor part 13A of a joint reinforcement body 13 arranged on the upper side of an existing joint part is connected to an under-floor part 13B of the joint reinforcement body arranged on the lower side by a connection member b2 piercing the existing floor 4 to construct the joint reinforcement body 13. The reinforcement column 11 and the reinforcement beam 12 are connected to the joint reinforcement body 10 to construct the reinforcement frame 10 excellent in rigidity and sterngth. The aseismatic capacity of the reinforcement frame 10 can be added to an existing building, and an upper surface of the floor is raised by the thickness of a steel plate of the on-floor beam member, and the column section is increased by the thickness of a steel plate of the reinforcement column, and neigher function nor appearance of the existing building is impaired.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of seismic reinforcement of an existing building, and more particularly, to a method of constructing an existing building by constructing a reinforcing frame comprising a reinforcing column and a reinforcing beam along the existing column, existing beam and existing floor. The present invention relates to a method of reinforcing earthquake resistance.

[0002]

2. Description of the Related Art There are the following methods for seismic reinforcement of existing buildings. Outside a reinforced concrete pillar of an existing building, a plurality of reinforcements arranged to extend in the longitudinal direction thereof, and a plurality of hoop reinforcements arranged at intervals in the longitudinal direction outside the reinforcements. A reinforcing bar consisting of a reinforcing bar consisting of a reinforcing member and a formwork placed outside the reinforcing bar, filling the gap between the inner surface of the formwork and the outer surface of the column with mortar or concrete, and forming the mortar or concrete after curing How to remove. A method in which the outside of a reinforced concrete pillar of an existing building is covered with a reinforcing member made of a steel plate or the like, and a gap between the inner surface of the reinforcing member and the outer surface of the pillar is filled with mortar or concrete. A large number of anchoring iron bars are planted at intervals on columns and beams of a frame of a building such as an existing reinforced concrete structure, a metal frame is arranged inside the frame, and the metal frame is interposed via the anchoring iron bar. A metal brace material is disposed in the metal frame, and both ends of the brace material are fixed to the metal frame, and the frame is reinforced with the brace material. A large number of anchoring rebars are planted at intervals on pillars and beams of a frame of a building such as an existing reinforced concrete structure, and wall rebars composed of vertical rebars and horizontal rebars are arranged in the frame. Attached to pillars and beams via anchor reinforcing bars, arranging splitting prevention bars around wall reinforcing bars, forming forms on both sides of wall reinforcing bars and splitting reinforcing bars, and filling gaps between formwork with mortar or concrete A method of removing a formwork after hardening mortar or concrete and constructing an earthquake-resistant wall.

[0003]

The above-mentioned seismic retrofitting methods are to increase the cross-section of column or beam members, to strengthen them, and to increase their shear strength.
Although the shear strength of the member increases, the bending strength of the frame does not increase, so that a significant increase in the total strength of the building is often not expected. The seismic retrofitting method of installing the above-mentioned brace and the seismic retrofitting method of installing the above-mentioned earthquake-resistant wall are as follows.
A large increase in shear strength is expected, and this is an effective method for satisfying the standard value. However, the construction of a new brace or an earthquake-resistant wall (blind wall) often has a drawback that conventional building traffic lines are fatally interrupted, and the usability of the room of the building deteriorates. Further, the seismic retrofitting method using a large amount of concrete may increase the weight of the building itself, and on the contrary, may decrease the seismic resistance of the building. The problems to be solved by the present invention are as described above.
To provide a seismic retrofitting method for existing buildings that does not have the drawbacks of the prior art such as, in other words, by covering a frame consisting of columns, beams and floors of an existing building with a reinforcing frame It is an object of the present invention to provide an earthquake-resistant reinforcement method for an existing building that can greatly increase its shear strength without impairing its usability (without providing a brace or an earthquake-resistant wall inside the building).

[0004]

SUMMARY OF THE INVENTION The present invention relates to a method for seismic retrofitting of an existing building, which comprises at least an existing building made of reinforced concrete or steel reinforced concrete having at least existing columns, existing beams and existing floors. A steel reinforcing column is provided to cover the periphery of the column, a steel beam-on-floor beam member is placed above the existing floor on the existing beam, and the lower side of the existing beam is placed below the existing beam. An under-floor beam member of the reinforcing beam is arranged to cover, and the reinforcing beam is constructed by joining the beam member above the floor and the beam under the floor with the steel connecting member penetrating the existing floor, sandwiching the existing floor. Arrange the upper part of the steel joint reinforcement on the floor above the existing joint that is the joint between the column and the existing beam, and arrange the under floor part of the joint reinforcement on the lower side of the existing joint, The existing floor is sandwiched between the upper and lower floors of the joint reinforcement by steel connecting members that penetrate the existing floor. Bonded to build the Joint reinforcement, it is to build a large reinforcing frame rigidity and strength by bonding a reinforcing pillar and reinforcing beam in Joint reinforcement.

In a preferred embodiment of the present invention, for example, the following (A) to (I) are performed. (A) The upper portion of the floor of the connection reinforcing body is constituted by an outer upper diaphragm made of a steel plate, and the lower portion thereof is connected to the outer lower diaphragm made of steel, the outer middle diaphragm, and the outer lower diaphragm and the outer middle diaphragm. A mouth column member and a connecting plate are joined together to form a vertical slot that penetrates the existing floor along the existing column at a portion where the existing beam does not exist below the existing floor around the existing column, A steel floor column member integrated with the connection column member is passed through the vertical slot, and the connection column member, the floor column member, and the reinforcing column are integrated. (B) The underfloor portion of the steel connection reinforcing body includes a portion that covers the lower surface of the existing floor near the joint between the existing beam and the existing column, a groove that receives the existing beam near the joint, and a reinforcing beam. An outer-diaphragm provided with an attachment part for an upper chord member of the underfloor beam member,
An outer lower diaphragm having a portion wider than the width of the existing beam and covering a lower side of the existing beam near the joint, and a mounting portion of a bottom connecting member of a reinforcing beam under the floor, an existing beam and an existing column A plurality of connection pillar members covering the part where the existing beam is not joined at the joint with the existing floor, and the existing floor along the existing column at the part where the existing beam does not exist under the existing floor around the existing column It consists of a plurality of floor pillar members respectively passing through a plurality of vertical slots provided so as to penetrate, and a plurality of pairs of connecting plates covering both side surfaces of the existing beam in the vicinity of the joint portion, and the existing beam in the vicinity of the joint portion. The outer middle diaphragm and the outer lower diaphragm are arranged in accordance with the beam formation, and each connecting column separating material and each connecting plate are arranged between the outer middle diaphragm and the outer lower diaphragm, and the upper part of each connecting column member And the lower part to the existing beam side of the outer and lower diaphragms. Then, the upper and lower portions of each pair of connecting plates are joined to the portions extending in the direction of the existing beams of the outer and middle diaphragms and the outer and lower diaphragms at intervals corresponding to the width of the existing beam, and the connection column member and the floor column member are joined together. Joined and configured as one.

(C) The outer upper diaphragm and the outer middle diaphragm are joined to each other by sandwiching the existing floor with steel connecting members (for example, bolts and studs) penetrating the existing floor. (D) The components (upper chord member, lower chord member, lattice member, and bottom connecting member) of the underfloor beam member of the reinforcing beam are fixed to the existing beam using an anchor planted in the existing beam. The underfloor portion (outer lower diaphragm, outer middle diaphragm, connecting column member, and connecting plate) of the connection reinforcing member is fixed to the existing beam or the like using an anchor planted in the existing beam or the like. Then, they are prevented from buckling. (E) The beam above the floor of the steel reinforcing beam is made wider than the width of the existing beam, and the beam below the floor of the reinforcing beam is arranged in parallel with the pair of plane trusses according to the width of the existing beam, and the lower chord of each plane truss is provided. The members are connected by a steel bottom connection member to form a substantially U-shaped cross section,
Steel connecting members (for example, bolts,
Studs) join the upper beam member of the reinforcing beam and the upper chord member of the flat truss of the lower beam member across the existing floor. (F) The upper chord members of the pair of flat trusses of the under-floor beam members of the reinforcing beams are made of angle iron, and the bottom connecting members connecting the lower chord members of the respective flat trusses are made wider than the width of the existing beams. (G) The floor beam member of the reinforcing beam is formed by joining steel mosaic plates, and the outer upper diaphragm, the outer lower diaphragm, and the outer middle diaphragm of the connection reinforcing member are also joined by steel mosaic plates. It is composed. (H) A steel connecting member (for example, a steel mosaic plate at a predetermined position on the lower surface of the steel mosaic plate for forming the outer diaphragm of the connection reinforcing member or the steel mosaic plate for forming the reinforcing beam on the floor above the floor). , Bolts, studs) or nuts are firmly joined by joining means such as welding, so that the heads and nuts of the bolts do not protrude above the plate. (I) The gap between the inner peripheral surface of the hole or the slot penetrated through the existing floor and the outer peripheral surface of the connecting member passed through the hole or the slot is mortar, cement, adhesive, or the like. Fill with filler.

[0007]

According to the invention of this application, a steel reinforcing column is provided so as to cover the periphery of an existing column, a beam member on the floor of the steel reinforcing beam is arranged above the existing floor on the existing beam, and the existing beam is provided. The under-floor beam member of the reinforcement beam is arranged under the existing beam so as to cover the lower side of the existing beam, and the beam member above the floor and the under-floor beam member are sandwiched by the steel connecting member penetrating the existing floor. A reinforcing beam is constructed by joining, and the upper part of the steel joint reinforcement is placed above the existing joint, which is the joint between the existing column and the existing beam, and the joint is placed below the existing joint. The lower part of the mouth reinforcement is arranged, and the upper part of the floor reinforcement and the lower part of the floor reinforcement are joined with the steel connecting member penetrating the existing floor across the existing floor to construct the connection reinforcement. Since the reinforcement columns and beams are joined to the connection reinforcement body to construct a reinforcement frame with high rigidity and strength, the reinforcement frame alone has seismic strength, and this strength is It can be cumulative to exist building.

[0008]

An embodiment is shown in FIGS. 1 to 10 and is an example in which the invention of this application is applied to seismic reinforcement of an existing reinforced concrete building. Existing building 1 shown in FIGS. 1 and 6
Is a multi-story building made of reinforced concrete, a number of existing columns 2 (only one is shown) with a rectangular cross section are connected by a number of existing beams 3 (only four are shown) with a rectangular cross section, and an existing floor 4 is On the upper side of the beam 3, it is integrally formed with the existing beam 3 and the existing column 2. The reinforcing frame 10 includes reinforcing columns 11 and reinforcing beams 1.
2. It is composed of the connection reinforcement 13 and the like. As shown in FIGS. 1 and 2, the reinforcing column 11 is made of steel that covers the existing column 2 between the floor surface of the existing floor 4 below the existing column 2 and the lower surface of the existing beam 3 above the existing column 2. It consists of a cylindrical body. The existing pillar 2 shown is
Since the cross section is a quadrangle, the reinforcing column 11 is formed of a steel quadrangular cylinder having an inner shape that matches the outer shape of the existing column 2. The reinforcing column 11 has, for example, a shape obtained by bisecting the rectangular cylinder in a plane including a central axis thereof and a bisector extending in a longitudinal direction of one plane of the square cylinder (the cross section is a U-shape). )
Is prepared by fitting the pair of gutter-shaped bodies to the existing column 2 from the outside, and joining the longitudinal edges of the pair of gutter-shaped bodies facing each other by joining means such as welding. I do.

The reinforcing beam 12 is composed of a beam member 12A above the floor, a beam member 12B below the floor, and a connecting member. Floor beam member 12
A, as shown in FIGS. 1 and 2, a large number of steel mosaic plates Pm1 are arranged in a line on an existing floor 4 immediately above an existing beam 3, and their butted portions are welded (downward fillet welding). )
Together comprises a sheet-like body of a width W ₁ formed by joining by the joining means and the like. The width W ₁ is, for example, not less than twice the width W of the existing beam 4. Shape in plan view of the Mosaic board Pm1 embodiment, as shown in FIG. 2, two rectangular Pm1a the long side in a short side W _1/2 is L ₁ (e.g., L ₁ is longer than W _1), Pm
1b is formed in such a manner that it is shifted in the longitudinal direction such that half of the long sides thereof overlap, but the present invention is not limited to this. In the illustrated embodiment, each of the mosaic plates Pm1 has four bolt holes b at a portion not facing the upper surface of the existing beam 3.
While h ₁ is bored, the number of bolt holes are better to 4 or more.

As shown in FIGS. 1 and 6, the underfloor beam member 12B is formed by connecting a pair of planar trusses 12B1 to a bottom connecting plate 12B2.
Is a lattice beam type having a substantially U-shaped cross section. The plane truss 12B1 is composed of an upper chord member 12B1a made of a non-equilateral angle iron and a narrow lower chord member 12B1b made of a steel plate.
The lattice member 12B1c made of steel is arranged in a zigzag shape between the upper and lower parts of the lattice member 12B1c.
Short side portion and lower chord member 12B1 of inequilateral angle iron of 2B1a
b by welding means such as welding. Bottom connecting plate 12B2 is composed of steel plate of narrow width W ₂ than the width W ₁ of the wider floor beam member 12A than the width W of the existing beam 3, on the upper side of the bottom connecting plate 12B2 A pair of plane trusses 12B1 are arranged in parallel to the width W of the existing beam 3,
The lower edge of the lower chord member 12B1b of each planar truss 12B1 is joined to the upper surface of the bottom connecting plate 12B2 by joining means such as welding to form an underfloor beam member 12B. Alternatively, a pair of lower chord members 12B1b may be joined to the upper surface of the bottom connecting plate 12B2 by joining means such as welding, and then the lattice member 12B1c and the upper chord member 12B1a may be joined to the lower chord member 12B1b. The long side portion of the scalene angle steel of upper chord member 12B1a to correspond to the bolt holes bh ₁ of the floor beam member 12A drilled bolt holes bh ₂ respectively, in each lattice member 12B1c, drilled bolt holes bh ₂ I do. As shown in FIG. 7, the underfloor beam member 12B may be manufactured by forming a pair of lower chord members 12B1b and a bottom connecting plate 12B2 with a steel material having a cross section of a square shape.

As shown in FIG. 1 to FIG. 5 and FIG. 8, the connection reinforcing member 13 includes an upper floor portion 13A extending from a steel outer upper diaphragm 13A1, a steel outer lower diaphragm 13B1,
Underfloor part 1 including outer and middle diaphragms 13B2, connection pillar members 13B3, floor pillar members 13B4, and connection plates 13B5
3B and a connecting member. The outer upper diaphragm 13A1 includes a portion 13A1a that covers the upper surface of the existing floor 4 near the joint between the existing beam 3 and the existing column 2, and a reinforcing beam 12A.
And a floor beam member 12A portion 13A1b extending existing beam direction with a mounting portion 13A1b ₁ of, for example, is manufactured by joining a mosaic plate Pm2 made four steel. The shape of the mosaic plate Pm2 embodiment, for example, as shown in FIG. 2, the short side is a long side in W _1/2 is L ₂ (for example, L ₂ is greater than W ₁₎ and the long rectangular Pm2a of short plan view consisting sides W _1/2 long sides L ₃ (e.g., L ₃ is W only _1/2 less than L ₂₎ and the short rectangular Pm2b of, the rectangular PM2a, a right triangle Pm2c connecting the Pm2b It has an L-shape. Two bolt holes bh are formed in a portion of the long rectangular Pm2a of the mosaic plate Pm2 which does not overlap with the upper surface of the existing beam 3.
₃ and one bolt hole bh ₃ is drilled in a portion of the short rectangular Pm2b that does not overlap the upper surface of the existing beam 3. As shown in FIG. 2, four mosaic plates Pm2 are arranged on the existing floor 4 around the existing pillar 2, and the long sides and the short sides of the rectangular Pm2a and Pm2b portions of the mosaic plates Pm2 adjacent to each other are welded ( For example, an outer upper diaphragm 13A1 which is to be an upper floor portion 13A of the joint reinforcing body 13 is formed by joining by joining means such as downward fillet welding.

As shown in FIG. 5, the outer lower diaphragm 13B1 includes a portion 13B1a that covers the lower side of the existing floor 4 near the joint between the existing beam 3 and the existing column 2, and an existing beam 3 near the joint. underfloor beam member 12B of the mounting portion 13B1b ₁ of the bottom connecting member 12B2 of a portion 13B1b extending existing beam direction, for example, bonding a mosaic plate Pm3 made four steel underside of cover and reinforcing beam 12 of Produced. The shape of the mosaic plate Pm3 embodiment, for example, as shown in FIG. 5, two long rectangular Pm3a short side long side at W _1/2 is L ₄ (e.g., L ₄ is slightly greater than L ₂₎ , Pm3b and a right-angled triangle Pm3c. Four mosaic plates Pm3 are arranged so as to be in contact with the lower surface of the existing beam 3 near the existing beam 3 around the existing column 2, and rectangles Pm3a and Pm3 of the mosaic plates Pm3 adjacent to each other are arranged.
The long side of the portion b is joined by joining means such as welding to form the outer lower diaphragm 13B1. Medium diaphragm 1
3B2 includes a portion 13B2a that covers the lower surface of the existing floor 4 near the joint between the existing beam 3 and the existing column 1, a groove 13B2c that receives the existing beam 3 near the joint, and an underfloor beam member 12B of the reinforcing beam 12. Mounting portion 13B2b ₁ of upper chord member 12B1
13B2b extending in the direction of the existing beam with
For example, it is composed of four steel mosaic plates Pm4.
The shape of the mosaic plate Pm4 embodiment, for example, a short side (W ₁ -W) / 2 in the long rectangular Pm4a long side in Kino Kikkake on the end of the L _5, a short side (W ₁ -W) / 2, the long side of which is L ₆ (for example, L ₆ is a little shorter than L ₅ ). It has a long rectangular shape Pm4b with a notch at the end and a right-angled triangle Pm4c. It is. Each mosaic board Pm4
Mosaic plate Pm along the long rectangles Pm4a and Pm4b
In correspondence with the second bolt hole bh ₃ bolt holes bh ₄ are bored.

As shown in FIGS. 1 and 4, the connecting column member 13B3 has a shape capable of covering a portion 2b of the existing column 2 where the existing beam 3 of the connecting portion between the existing column 2 and the existing beam 3 is not joined. And L-shaped members made of steel having the following dimensions. In a portion of the existing floor 4 around the existing column 2 where the existing beam 3 does not exist directly below, an L-shaped vertical slot 4a that penetrates the existing floor 4 along the existing column 2 is formed. Floor column member 13B4
As shown in FIG. 3, is formed of a steel member having an L-shaped cross section having a shape and dimensions capable of covering a portion of the existing column 2 corresponding to the vertical slot 4a. In addition, the connection pillar member 13B3 and the floor pillar member 13B4 may be formed integrally, or may be manufactured separately and joined by joining means such as welding at the time of assembly. As shown in FIGS. 1, 4 and 8, the connection plate 13B5 is formed of a steel plate having a shape and dimensions capable of covering both side surfaces of the existing beam 3 from the existing column 2.

[0014] Between the outer middle diaphragm 13B2 and the outer lower diaphragm 13B1, a connection column member 13B3 and a connecting plate 1 are provided.
3B4, a connection column member 13B3 and a connection plate 13B4.
Is joined to the lower side of the existing column side edge of the outer middle diaphragm 13B2 and the lower side of the groove 13B2c side end of the outer middle diaphragm 13B2 by welding or the like, and the connecting plate 13B4 and the connection column member 1 are joined.
The lower edge of 3B3 is joined to the upper surface of the outer lower diaphragm 13B1 and the upper edge of the existing column side by joining means such as welding, and the vertical edges of the connection column member 13B3 and the connecting plate 13B4 are welded to each other. By joining by the joining means, the underfloor portion 13B of the joint reinforcing body 13 is formed. Connection reinforcement 13
In order to facilitate the attachment of the underfloor portion 13B to the existing columns 2 and the existing beams 3, for example, the connection column member 13B3 and the connection plate 1 are provided between the mosaic plate Pm4 and the mosaic plate Pm3.
3B4, a connection column member 13B3 and a connection plate 13B4.
Of the mosaic plate Pm4 is joined to the lower side of the existing column side edge and to the lower side of the groove 13B2c side edge of the mosaic plate Pm4.
B4 and the lower edge of the connection pillar member 13B3 are mosaic plates Pm.
3 and the upper edge of the existing column side, and the vertical edges of the connection column member 13B3 and the connection plate 13B4 are bonded to each other to divide the underfloor portion 13B of the connection reinforcing member 13 ( 4) The underfloor portion 13B 'is manufactured, and the underfloor portion 13B' of the reinforcing member 13 is attached to the existing column 2 and the existing beam 3 of the joint portion and joined to each other by joining means such as welding.
Is formed.

Next, a method of reinforcing the existing building 1 using the reinforcing frame 10 will be described. Before the reinforcing frame 10 is attached to the existing building 1 made of reinforced concrete, the existing floor 4 is pierced along the existing column 2 at a portion where the existing beam 3 does not exist immediately below the existing floor 4 around the existing column 2. An L-shaped vertical slot 4a is formed in a plan view. Moreover, the existing beam 3 and a little distant parts of the existing floor 4 from the joining line between the existing floor 4, so as to correspond to the bolt holes bh ₁ mosaic plate Pm1 of floor beam members 12A, bolt holes through the existing floor 4 4b,
Outer upper diaphragm 1 of floor portion 13A of connection reinforcement 13
Bored bolt holes 4c extending therethrough to each of the existing floor 4 corresponding to the respective bolt holes bh ₃ mosaic plate Pm2 of 3A1. Furthermore, the under-floor beam members 12B on both sides of the existing beam 3
Each portion corresponding to the bolt holes bh ₂ of each lattice member 12B1c of drilled the implantation hole of the nut or bolt, respectively, inserting the resin, the adhesive and the nut or bolt such as cement in the implantation hole Then, a nut or a bolt is implanted on the side of the existing beam 3 via the adhesive.

Then, on the existing column 2 below the existing beam 3,
A pair of U-shaped troughs are fitted from the outside, and the longitudinal edges of the troughs are joined by joining means such as welding to construct a lower reinforcing column 11. Next, four steel mosaic plates Pm2 are arranged on the existing floor 4 around each of the existing columns 2 as shown in FIG. 2, and the long sides of the rectangular Pm2a and Pm2b portions of the mosaic plates Pm2 adjacent to each other. Are joined by joining means such as welding to form an outer upper diaphragm 13A1.
The mosaic plates Pm1 are arranged in a row on the existing floor 4 immediately above the existing beam 3, and their butted portions are joined to each other by joining means such as welding (downward fillet welding), and the beam 1 on the floor is provided.
Form 2A. Then, joined by a joining means such as welding (downward fillet welding) the ends of the floor beam member 12A to the mounting portion 13A1b ₁ outside on the diaphragm 13A1.

A pair of mosaic plate Pm3 and mosaic plate Pm
2 and one connection column member 13B3 and a pair of connection plates 13
The underfloor portion 13 of the connection reinforcement 13 made by joining with B4
One divided (four-split) underfloor portion 13B 'of B is arranged below the existing floor 4 around the existing column 2, and the connection column member 13B3
Is inserted into the vertical slot 4a of the existing floor 4, and each bolt hole bh ₃ of the outer upper diaphragm 13A1, each bolt hole 4c of the existing floor 4, and each bolt hole of the outer middle diaphragm 13B2. bh through ₄ each bolt b _2, temporarily attach the divided floor portion 13B 'by screwing a nut n ₂ to the threads of the previous bolts b _2. After temporarily attaching the four divided underfloor portions 13B 'in the same manner, the divided underfloor portions 13B' are joined by joining means such as welding to form the underfloor portion 13B of the joint reinforcing member 13. Then, the bolts b ₂ and nuts n ₂ are fully tightened, and the upper end of the floor column member 13B4 is joined to the portion 13A1a ₁ of the outer diaphragm 13A1 facing the existing column 2 by welding or other joining means. Then, the upper floor portion 13A and the lower floor portion 13B of the connection reinforcing member 13 are integrated. Then, the lower side of the edge on the existing column 2 side of the outer lower diaphragm 13B1 of the lower floor portion 13B of the connection reinforcing member 13 and the upper end of the lower reinforcing column 11 facing this are joined by joining means such as welding. . If necessary, the outer lower diaphragm 13B1 and the connection plate 13B4 of the underfloor portion 13B of the connection reinforcing member 13 can be connected to the existing beam 3 using an anchor planted in the existing beam 3.
And the connecting column member 13 of the underfloor portion 13B.
B3 may be joined to the existing column 2 using an anchor planted on the existing column 3.

An under-floor beam member 12B is arranged below the existing beam 3, and the existing beam 3 is positioned between the pair of planar trusses 12b1. previous against the lower surface, the bolt holes bh ₁ of the floor beam member 12A, through each of the bolt holes 4b of the existing floor 4, and the bolt holes bh ₂ of upper chord member 12B1a bolt b _1, of each bolt b ₁ tightened by screwing the nut n ₁ to the threaded portion. Then, the under-floor beam member 12A and the under-floor beam member 1
2B is integrated with the existing floor 4 with the existing floor 4 interposed therebetween to construct a reinforcing beam 12. In addition, each lattice member 12B1 of the under-floor beam member 12B
through c bolt into the bolt holes bh ₅ of the previous thread of the bolt so as to correspond to the tightening is screwed into a nut which is embedded in the side surface of the existing beam 3, to secure the floor beam member 12A to the existing beam 3 . Note that members other than the lattice members 12B1c of the underfloor beam members 12B may be fixed to the existing beams 3 using anchors implanted in the existing beams 3. End of upper chord member 12B1a of underfloor beam member 12B, lower chord member 12B
1b and the end of the bottom connecting plate 12B2 are connected to the end 13B2b ₁ of the outer middle diaphragm 13B2 of the connection reinforcing body 13,
Joined by a suitable bonding means such as welding to the end 13B1b ₁ end 13B5b ₁ and the lower outer diaphragm 13B1 connecting board 13B5 underfloor portion 13B, also underfloor beam member 1
The lower part of the lattice member 12B1c of the 2B1 from the connection reinforcing body 13 is connected to the end 13B5b _{1 of the} connection plate 13B5.
And the underfloor beam member 12B and the underfloor portion 13B of the connection reinforcing member 13 are integrated with each other by an appropriate joining means such as welding or bolt / nut joining. FIG. 5 shows an end of the bottom connecting plate 12B2 of the underfloor beam member 12B and the outer lower diaphragm 1.
And the end 13B1b ₁ of 3B1 are bonded using served plate 14 and bolts and nuts.

Next, a pair of U-shaped gutter-shaped members are fitted to the existing column 2 above the existing beam 3 from the outside thereof, and the longitudinal edges of the gutter-shaped members are joined by joining means such as welding. Then, the upper reinforcing column 11 is constructed. Then, the lower end of the upper reinforcing column 11 is connected to the floor column member 1 of the lower floor portion 13B of the connection reinforcing member 13.
Together are joined by joining means such as welding to the top of 3B4, joined by an appropriate joining means such as welding edges 13A1a ₁ existing pillar 2 side of the outer on the diaphragm 13A1 of the floor portion 13A, Joint reinforcement 13 And the upper reinforcing column 11 are integrated. The above-described reinforcing method for attaching the reinforcing columns 11, the reinforcing beams 12, and the connection reinforcing members 13 to the existing columns 2 and the existing beams 3 to construct the reinforcing frame 10 is sequentially applied to the existing columns 2 and the existing beams 3 such as upper floors. Thereby, the existing building 1 of the multi-layered reinforced concrete structure is seismically reinforced.

The upper diaphragm of the upper beam member 12A of the reinforcing beam 12 and the outer diaphragm 1 of the upper floor portion 13A of the connection reinforcing member 13
When it is not desired to expose the head and nut of the bolt on the upper surface of 3A1, for example, the following [1] and [2] are performed. [1] A bolt is welded to a predetermined position on the lower surface of the mosaic plates Pm1 and Pm2 at right angles to the lower surface. Then, when disposing the mosaic plates Pm1 and Pm2 on the existing floor 4 immediately above the existing beams 3, the bolts welded to the mosaic plates Pm1 and Pm2 are inserted into the bolt holes 4b and 4c of the existing floor 3. [2] Nuts n are welded to predetermined positions on the lower surfaces of the mosaic plates Pm1 and Pm2. And the existing floor 4 directly above the existing beam 3
When arranging the mosaic plates 12A1 and 13A1a on the top, the nut n welded to the mosaic plates Pm1 and Pm2 is attached to the existing floor 3
Of the bolt holes 4b, 4c. Existing floor 4 bored with bolt holes 4b, filled mortar in the gap, cement, a filler such as an adhesive between the 4c or Tatemizoana 4a and the bolt b _1, b ₂ or floor post member 13B4, The horizontal force acting on the existing floor 4 or the like at the time of an earthquake or the like is transmitted to each bolt or the like via the filler, so that the horizontal force can be quickly transmitted to the reinforcing frame 10 through each bolt or the like. In the embodiment, the mosaic plates Pm1 and Pm2 are connected to the existing beams 3 and the existing floors 4.
The case where the on-floor portion 13A of the connection reinforcing body 13 and the on-floor beam member 12A of the reinforcing beam 12 are formed while assembling to the above has been described. Under-floor beam member 12b of reinforcement beam 12 and connection reinforcement 1
3 is divided into a number of components, and each component is produced in a factory or the like, and the components are carried to a construction site, where they are transferred to existing columns 2, existing beams 3, and existing floors 4 of an existing building 1. While assembling, the under-floor beam member 12 of the reinforcing beam 12
B and the underfloor portion 13B of the connection reinforcement 13 may be constructed. In addition, a free access floor Fa is provided above the existing floor 4 reinforced by the reinforcing beams 12, the connection reinforcing members 13, and the like, as necessary.

[0021]

According to the present invention, the following effects (a) to (nu) can be obtained by providing the structure described in the claims. (B) The method for reinforcing an existing building according to claim 1 includes a method for reinforcing an existing building having at least an existing column, an existing beam, and an existing floor. A steel reinforcing column is provided to cover, and a steel reinforcing beam on the floor is placed above the existing floor on the existing beam, and reinforced to cover the lower side of the existing beam below the existing beam. A reinforcement beam is constructed by arranging an under-floor beam member of a beam and connecting the over-floor beam member and the under-floor beam member across the existing floor with a steel connecting member penetrating the existing floor to form a reinforcing beam. The upper part of the steel connection reinforcement is placed above the existing connection part, which is the junction with the floor, and the lower part of the connection reinforcement is placed below the existing connection part, penetrating the existing floor Reinforcing the joint by joining the existing floor to the upper and lower floors of the joint reinforcement with the steel connecting member Building a, from building a large reinforcing frame rigidity and strength by bonding a reinforcing pillar and reinforcing beam in Joint reinforcement has a yield strength of seismic reinforcing frame alone,
This strength can be added to existing buildings. Also,
According to the seismic retrofitting method of claim 1, no new braces, earthquake-resistant walls, etc. are provided, so that there is no interruption to the building flow lines of the existing building, no deterioration in the usability, and a great increase in the shear strength. Can be raised. further,
In the seismic retrofitting method according to the first aspect, the processing to be applied to the existing building is only to provide a hole or a slot for passing the connecting member through the existing floor. Also, the effective space reduction due to reinforcement is due to the fact that when installing a ceiling, the upper surface of the floor is raised by the thickness of the steel plate of the beam members on the floor of the reinforcing beam, and the cross section of the column is It is only the thickness and does not impair the function and aesthetics of the existing building. Unlike the conventional seismic retrofitting method, problems such as hindrance to use of the room, reduction of the effective area of the room, and generation of a large amount of industrial waste do not occur.

(B) In the method for seismic reinforcement of an existing building according to the second aspect, the upper part of the floor of the joint reinforcement is constituted by an outer diaphragm made of steel plate, and the lower part of the floor is made of an outer diaphragm made of steel. An outer-diaphragm, and a connecting column member and a connecting plate for connecting the outer-lower diaphragm and the outer-diaphragm are joined to each other, and a portion where the existing beam does not exist under the existing floor around the existing column. A flute that penetrates the existing floor along the existing pillar is provided, and a steel floor pillar member integrated with the port pillar member is passed through the flute, and the connection pillar member, the floor pillar member, and the reinforcing pillar are provided. Is integrated, the upper reinforcing column and the lower reinforcing column, which constitute a part of the reinforcing frame, can be integrated via the connection column member and the floor column member of the connection reinforcing member, and the existing building can be integrated. The reinforcement frame consisting of reinforcement columns, reinforcement beams and connection reinforcements without damaging Can be built, it is possible to increase the strength of its seismic. (C) When the under-floor portion of the steel connection reinforcing member is formed as described in claim 3, a connection reinforcing member that can easily join the reinforcing columns and the reinforcing beams is obtained, and the reinforcing frame is provided. The workability of assembling the constituent members of the above to an existing building is improved.

(D) In the method for reinforcing an existing building according to the fourth aspect of the present invention, the outer upper diaphragm and the outer middle diaphragm are joined to each other by sandwiching the existing floor with a steel connecting member penetrating the existing floor. In addition, the upper floor portion and the lower floor portion of the connection reinforcement can be easily and reliably integrated. (E) The seismic retrofitting method for an existing building according to claim 5 is a method for constructing an anchor in which the underfloor beam member of the reinforcing beam and the underfloor portion of the connection reinforcement are planted in the corresponding portion of the existing building. Since it is used and fixed to an existing building, it is possible to prevent buckling of a reinforcing frame including a reinforcing column, a reinforcing beam, and a connection reinforcing body at the time of an earthquake or the like. (F) The seismic retrofitting method for an existing building according to claim 6 is to make a beam member above the floor of the steel reinforcing beam wider than the width of the existing beam,
The under-floor beam member of the reinforcing beam is arranged in parallel with the pair of plane trusses according to the width of the existing beam, and the lower chord members of each plane truss are connected by a steel bottom connecting member to form a substantially U-shaped cross section, Since the steel beams connecting the existing floor are used to connect the upper beams of the reinforcing beams and the upper chord members of the planar truss of the lower beams, sandwiching the existing floor, the upper beam members and the lower beam members of the reinforcing beams are used. Can be easily and reliably integrated. In addition, since the under-floor beam members are formed using the pair of flat trusses, the weight can be easily reduced, and the assembling to the existing beams can be facilitated.

(G) The seismic retrofitting method of an existing building according to claim 7, wherein the upper chord members of the pair of the flat trusses of the under-floor beam members of the reinforcing beams are formed of angle iron, and the lower chord members of the pair of the flat trusses are connected. Since the bottom connecting member to be formed is made wider than the width of the existing beam, the strength of the beam member under the floor of the reinforcing beam can be easily increased, and the beam member above the floor and the floor member of the reinforcing beam by the continuous member penetrating the existing floor. The joinability between the beam member and the upper chord member of the plane truss is also improved. (H) The method for earthquake-resistant reinforcement of an existing building according to claim 8 includes a method of forming a plurality of steel mosaic plates by using a beam member above the floor of the reinforcing beam, an outer upper diaphragm, an outer lower diaphragm, and an outer middle diaphragm of the connection reinforcing body. Since the mosaic boards are joined together, the mosaic boards can be attached to the existing building, and the assembling work of the reinforcing frame and the like can be facilitated. (I) The seismic retrofitting method for an existing building according to claim 9 is provided at a predetermined position on a lower surface of a steel mosaic plate for constructing a beam member on the floor of the reinforcing beam or an outer diaphragm of the connection reinforcing member,
Steel connection members (eg bolts, studs, nuts)
Are firmly joined by joining means such as welding, so that the heads and nuts of the bolts do not protrude from the upper surface of the mosaic plate. (N) The method for reinforcing an existing building according to claim 10 is as follows:
Fill the gap between the inner peripheral surface of the hole or slot formed in the existing floor and the outer peripheral surface of the connecting member passed through the hole or slot with a filler such as mortar, cement, adhesive or the like. Can immediately transmit the seismic force, etc. acting on the existing building to the reinforcing frame consisting of the reinforcing columns, reinforcing beams, and connection reinforcements via fillers and connecting members, and reinforce the seismic force, etc. Can be received in a frame.

[Brief description of the drawings]

FIG. 1 is a front view of a main portion of an existing building reinforced by an earthquake-resistant reinforcing method according to an embodiment of the present invention, taken along line AA of FIG.

FIG. 2 is a plan view of a main part of the existing building shown in FIG. 1 taken along the line BB.

FIG. 3 is a plan view of a main part of the existing building shown in FIG. 1 taken along a line CC.

FIG. 4 is a plan view of an essential part of the existing building shown in FIG. 1 taken along a line DD.

FIG. 5 is a plan view of a main part of the existing building shown in FIG. 1 taken along a line EE.

FIG. 6 shows the reinforced beam of the existing building shown in FIG.
Side view of the main part taken along line -F

FIG. 7 is a plan view of a main part in which another type of reinforced beam of the existing building is sectioned along the same line as the line FF of FIG. 1;

FIG. 8 is a side view of a main part in which the reinforced connection part of the existing building shown in FIG. 1 is sectioned along the line GG.

FIG. 9 is a front view of a mosaic plate with bolts welded to the lower surface of the embodiment.

FIG. 10 is a front view of a mosaic plate with a nut welded to the lower surface of the embodiment.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Existing building 2 Existing pillar 3 Existing beam 4 Existing floor 4a Vertical slot 4b, 4c Bolt hole 10 Reinforcement frame 11 Reinforcement column 12 Reinforcement beam 12A Above floor beam member 12B Below floor beam member 12B1a Upper chord member 12B1b Lower chord member 12B1c Lattice member 12B2 Bottom Connection member 13 Joint reinforcement body 13A Above floor part of joint reinforcement body 13A1 Outer upper diaphragm 13B Lower floor part of joint reinforcement body 13B1 Outside lower diaphragm 13B2 Outside middle diaphragm 13B3 Connection pillar member 13B4 Floor pillar member 13B5 Connecting plate bh _{1 to} bh ₅ bolt holes b ₁ ~b ₂ volts Fa free access floor n ₁ ~n ₂ nut Pm1~Pm4 mosaic plate

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Mitsuo Seki, Inventor, 8-21-1, Ginza, Chuo-ku, Tokyo Inside Takenaka Corporation Tokyo Main Store (72) Inventor, Masayuki Iwata 8-21, Ginza, Chuo-ku, Tokyo No. 1 Inside Takenaka Corporation Tokyo Main Store (72) Inventor Muneka Miyagi 8-21-1, Ginza, Chuo-ku, Tokyo Inside Tokyo Main Branch Takenaka Corporation (72) Inventor Mitsuru Kimura Chuo-ku, Tokyo 8-21-1, Ginza Takenaka Corporation Tokyo Main Store (72) Inventor Yuko Tsuji 8-21-1, Ginza Ginza, Chuo-ku, Tokyo Co., Ltd. Takenaka Corporation Tokyo Main Store (72) Inventor Okubo Sadayoshi 8-21-1, Ginza, Chuo-ku, Tokyo Inside Takenaka Corporation Tokyo Main Store (72) Inventor Takaaki Hiroshige 8-21-1, Ginza, Ginza, Chuo-ku, Tokyo Tokyo Takenaka Corporation Store (72) inventor Masaru Fujimura Tokyo Ginza, Chuo-ku, eight-chome No. 21 No. 1 stock company Takenaka Corporation Tokyo in the head office

Claims (10)

[Claims] 1. A method of seismic reinforcement of an existing reinforced concrete or steel reinforced concrete building having at least existing columns, existing beams and existing floors, wherein a steel reinforcing column is provided so as to cover the periphery of the existing column. An upper beam member of a steel reinforcing beam is placed above the existing floor on the beam, and a lower beam member of the reinforcing beam is placed below the existing beam to cover the lower side of the existing beam. The reinforcing beam is constructed by connecting the beam above the floor and the beam below the floor with the steel connecting member penetrated across the existing floor, and above the existing connection, which is the joint between the existing column and the existing beam. The upper part of the steel connection reinforcement is placed on the floor, the lower part of the connection reinforcement is placed below the existing connection, and the connection is reinforced with steel connecting members that penetrate the existing floor The upper part of the body and the lower part of the body are joined by sandwiching the existing floor to construct a joint reinforcement body, and reinforcement columns and reinforcing beams are added to the joint. Retrofit method of existing buildings, characterized in that by joining the body to build the larger reinforcing frame rigidity and strength. 2. A steel reinforcing column is provided so as to cover the periphery of an existing column of an existing building of a reinforced concrete structure or a steel reinforced concrete structure having an existing column, an existing beam, and an existing floor. A steel beam above the floor of a steel reinforcing beam is placed on the upper side, and a beam member below the floor of the reinforcing beam is placed below the existing beam to cover the lower part of the existing beam. The reinforcing members are constructed by connecting the beams above the floor and the members below the floor with the connecting members of the existing floor sandwiching the existing floor, and a steel connection is made above the existing connection, which is the joint between the existing columns and the existing beams. Arrange the upper part of the mouth reinforcement body, arrange the lower part of the mouth reinforcement body below the existing connection part, and with the steel connecting member penetrating the existing floor and the upper part of the floor reinforcement part A joint reinforcement body is constructed by joining the underfloor part with the existing floor in between, and reinforcing columns and beams are joined to the joint reinforcement body to provide high rigidity and strength. In the seismic retrofitting method of an existing building that constructs a strong frame, the upper part of the floor of the joint reinforcement is composed of an outer diaphragm made of steel plate, and the lower part of the floor is made of a steel outer lower diaphragm, an outer middle diaphragm, and an outer lower diaphragm. It is constructed by joining the connecting column member and the connecting plate connecting the lower diaphragm and the outer middle diaphragm, and existing along the existing column at the part where the existing beam does not exist under the existing floor around the existing column. A vertical groove hole penetrating the floor is provided, and a steel floor column member integrated with the connection column member is passed through the vertical groove hole, and the connection column member and the floor column member are integrated with the reinforcing column. A seismic retrofitting method for existing buildings, characterized in that: 3. An underfloor portion of a steel connection reinforcing body covers a lower surface of an existing floor near a joint between an existing beam and an existing column, a groove for receiving an existing beam near the joint, and a reinforcement. An outer-diaphragm having an attachment portion for the upper chord member of the underfloor beam member of the beam, a portion which is wider than the width of the existing beam and covers the lower side of the existing beam near the joint, and An outer lower diaphragm having an attachment portion for a bottom connecting member, a plurality of connection pillar members covering a portion where the existing beam is not joined to a joint portion between the existing beam and the existing column, and an existing floor around the existing column A plurality of floor column members respectively passing through a plurality of vertical slots provided through the existing floor along the existing column in a portion where the existing beam does not exist under the same, and both side surfaces of the existing beam near the joint portion Consisting of a plurality of pairs of connecting plates that cover the existing beam in the vicinity of the joint. A middle diaphragm and an outer lower diaphragm are arranged, each connection column member and each connection plate are arranged between the outer middle diaphragm and the outer lower diaphragm, and the upper and lower portions of each connection column member are the outer middle diaphragm and the outer middle diaphragm. The lower diaphragm is joined to the existing beam side portion, and the upper and lower portions of each pair of connecting plates are joined to the outer middle diaphragm and the outer lower diaphragm extending in the direction of the existing beam with an interval corresponding to the width of the existing beam. The seismic retrofitting method for an existing building according to claim 2, wherein the connection pillar member and the floor pillar member are joined and integrally formed. 4. An existing building according to claim 2 or 3, wherein the outer upper diaphragm and the outer middle diaphragm are joined with the existing floor sandwiched by a steel connecting member penetrating the existing floor. Seismic reinforcement method. 5. A method according to claim 1, wherein the under-floor beam member of the reinforcing beam and the under-floor portion of the joint reinforcement are fixed to the existing building using an anchor planted in a corresponding existing building portion. The seismic reinforcement method for an existing building according to any one of claims 1 to 3. 6. A steel reinforcing column is provided so as to cover the periphery of an existing column of a reinforced concrete or steel reinforced concrete building having an existing column, an existing beam and an existing floor. A steel beam above the floor of a steel reinforcing beam is placed on the upper side, and a beam member below the floor of the reinforcing beam is placed below the existing beam to cover the lower part of the existing beam. The reinforcing members are constructed by connecting the above-floor beam members and the under-floor beam members across the existing floor with the connecting members of the above, and a steel connection is made above the existing connection, which is the joint between the existing columns and the existing beams. Arrange the upper part of the mouth reinforcement body, arrange the lower part of the mouth reinforcement body below the existing connection part, and with the steel connecting member penetrating the existing floor and the upper part of the floor reinforcement part A joint reinforcement body is constructed by joining the existing floor with the underfloor part, and reinforcement columns and beams are joined to the joint reinforcement body to increase rigidity and strength. In the seismic retrofitting method of an existing building that constructs a reinforcing frame, the beam members above the floor of the steel reinforcing beams are made wider than the width of the existing beams, and the beam members below the floor of the reinforcing beams are set to the width of the existing flat trusses. The lower chord members of each plane truss are connected by a steel bottom connecting member to form a substantially U-shaped cross section, and the steel connecting members penetrating the existing floor are used on the reinforcing beam floor. A seismic retrofitting method for an existing building, comprising joining a beam member and an upper chord member of a flat truss of an underfloor beam across an existing floor. 7. The upper chord member of the pair of plane trusses of the underfloor beam member of the reinforcing beam is made of angle iron, and the bottom connecting member connecting the lower chord members of each plane truss is made wider than the width of the existing beam. The seismic reinforcement method for an existing building according to claim 6, wherein 8. A steel beam mosaic plate, wherein at least one of a beam member on the floor of the reinforcing beam, an outer diaphragm, an outer lower diaphragm, and an outer middle diaphragm of the connection reinforcing member is constructed by joining a steel mosaic plate. Item 5. The method for reinforcing an existing building according to any one of Items 1 to 4 and 6. 9. A steel mosaic plate for constructing a beam member above the floor of a reinforcing beam or a steel mosaic plate for constructing an outer diaphragm of a connection reinforcing member is provided at a predetermined position on a lower surface of a steel mosaic plate. The seismic reinforcement method for an existing building according to claim 8, wherein the connecting member or the nut is strongly joined by joining means such as welding. 10. A gap between an inner peripheral surface of a hole or a slot formed in an existing floor and an outer peripheral surface of a connecting member passed through the hole or the slot is made of mortar, cement, adhesive or the like. The seismic retrofitting method for an existing building according to any one of claims 1 to 4, characterized in that the building is filled with a filler.