JP3766941B2 - Seismic reinforcement method for existing buildings - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a seismic reinforcement method for an existing building, and more particularly to a seismic reinforcement method for an existing building in which a load bearing wall is constructed using an iron block.
[0002]
[Prior art]
Examples of building vibration control methods include the following (1) and (2).
(1) A plurality of holes are provided in a mild steel block with a certain distance between them and horizontally penetrated, and a constriction that expands the plastic deformation zone is provided on the side of each hole to absorb vibration energy from earthquakes. An elastic-plastic damper, and a wall is arranged in the space surrounded by the pillars and beams of the building, and there is a gap between the wall and the pillars on both sides and between the wall and the upper and lower beams. The elastic-plastic damper is disposed in a gap between one beam of the upper and lower beams and the wall or in a gap between the both side pillars and the wall, and the vibration of the earthquake is caused by the elastic-plastic damper. A vibration damping method that absorbs energy (for example, see Japanese Patent Application Laid-Open No. 8-277651).
(2) In the damping wall provided between the pillars and beams of the building, the steel plate is provided with a plurality of slits along the vertical direction, and the upper and lower portions of the steel plate are fixed to the beam, respectively, on both sides of the steel plate, A precast concrete plate that covers substantially the entire surface of the steel plate is attached with a mounting bolt that is inserted through the insertion hole of the steel plate so that the steel plate can be displaced along at least the horizontal direction of the steel plate, and the steel plate A damping method in which a viscous body is sandwiched between a precast concrete plate and a precast concrete plate to form a damping wall, and the vibration energy of the earthquake is absorbed by this damping wall (see, for example, Japanese Utility Model Publication No. 4-32454).
Examples of the seismic reinforcement method for existing buildings include the following (3) and (4).
(3) A large number of anchor bars are installed at intervals between existing columns and existing beams that constitute the frame of an existing building such as a reinforced concrete structure, and a metal frame is arranged inside the frame, and this metal frame A body is attached to an existing column and an existing beam through the iron bar for anchors, a metal brace material is arranged in the metal frame body, and both ends of the brace material are fixed to the metal frame body. A seismic reinforcement method for reinforcing the frame.
(4) Many anchor reinforcing bars are planted at intervals between existing columns and existing beams of existing building structures such as reinforced concrete structures, and wall reinforcing bars consisting of vertical reinforcing bars and horizontal reinforcing bars are placed in the frame. , This wall rebar is attached to the existing column and beam via the anchor rebar, the split bar is placed around the wall bar, the molds are placed on both sides of the wall bar and split bar, A seismic reinforcement method that fills the gaps with mortar or concrete, removes the formwork after the mortar or concrete is cured, and constructs a seismic wall.
[0003]
[Problems to be solved by the invention]
In the vibration damping method of (1), an elastic-plastic damper made of a soft steel block is placed in the gap between one beam of the upper and lower beams and the wall or in the gap between the both side columns and the wall. It is necessary to construct a wall so that a gap is formed between one beam and the wall or between both side pillars and the wall, which increases the weight of the building and has the disadvantage of poor workability. is there.
The vibration control method of (2) is to fix the upper and lower parts of the steel plate provided with a plurality of slits along the vertical direction to the upper and lower beams, and to displace the precast concrete plate along the horizontal direction on both sides of the steel plate. It is necessary to install a damping wall with bolts in such a state that it is possible to squeeze a viscous material between the steel plate and the precast concrete plate, and it takes time and effort to form the damping wall. However, there is a drawback that the weight of the building increases.
The seismic reinforcement method for newly installing the brace described in (3) above requires only a lot of work to plant a large number of anchors on the frame, fix the metal frame to the frame, and attach the brace material to the metal frame. In addition, there is a problem in carrying materials such as metal frames and braces into the building space.
The seismic reinforcement method for newly installing the seismic wall of (4) above is the installation of many anchor rebars to the frame, the installation of wall rebars to the frame, the installation of formwork on both sides of the wall rebar, and the placement of concrete. Not only does it take a lot of work to install, but it also has the disadvantage of increasing the weight of the building, and there are also problems in bringing materials such as wall rebar, formwork and concrete into the space.
Moreover, the seismic reinforcement method using a large amount of concrete may increase the weight of the building itself and conversely reduce the earthquake resistance of the existing building.
The problem to be solved by the present invention is to provide a seismic reinforcement method for existing buildings that does not have the disadvantages of the prior arts (1) to (4), in other words, An object of the present invention is to provide a seismic reinforcement method for an existing building that can be constructed with good workability by suppressing the increase in weight and shorten the construction period.
[0004]
[Means for Solving the Problems]
The method for seismic reinforcement of a building according to the present invention includes a large number of blocks composed of short rectangular cylinders made of iron in a space surrounded by left and right existing columns and upper and lower existing beams. Stack and form a partition so that the end faces of each block are substantially flush with each other, join the existing columns and the existing beams of the many blocks that make up this partition to the existing columns and existing beams, and In the seismic retrofitting method of existing buildings with existing columns and existing beams that join the mutually facing parts of many adjacent blocks to each other as a bearing wall , face existing columns and existing beams where large force acts A filling material such as mortar is filled in the inner space of each block arranged in the portion corresponding to the diagonal line or the diagonal line that becomes the straight line and the diagonal line .
If there is an existing floor above the existing beam, the term “existing beam” includes the part of the existing floor directly above the existing beam.
In addition, the method for seismic reinforcement of a building according to the present invention includes a large number of blocks composed of short rectangular cylinders made of iron, in a space surrounded by left and right existing columns and upper and lower existing beams. In addition, the blocks are stacked to form a partition so that the end faces of the blocks are substantially flush with each other, and the parts that face the existing columns and existing beams among the many blocks that constitute the partitions are joined to the existing columns and existing beams. In the seismic reinforcement method for existing buildings equipped with existing columns, existing beams, etc., which join the mutually facing parts of a number of adjacent blocks to each other as a bearing wall, a short block made of iron as a block An existing column on which a large force acts using a non-reinforcing block that does not provide a stiffener in the inner space of the rectangular tube and a reinforcing block that includes a stiffener in the inner space of a short rectangular tube made of iron Face to existing beam That the part and the corresponding part to the diagonal or oblique line to be struts arranged reinforcing block, the other part is characterized in placing the unreinforced block.
In a preferred embodiment of the invention, the inner space of the reinforcing block may be filled with a filler such as mortar.
[0005]
The block used for the seismic reinforcement method of this invention is comprised like following ( A )-( D ), for example.
( A ) A short rectangular tube made of iron, with the upper plane portion and the lower plane portion parallel to each other, the left plane portion and the right plane portion parallel to each other, and the left and right plane portions The plane portion is arranged at right angles to the upper and lower plane portions, the upper portions of the left and right plane portions are continuous with the upper plane portion, and the lower portions of the left and right plane portions are the lower plane portions. A block is manufactured by configuring the blocks in such a manner that at least one bolt hole is provided at a corresponding portion of the upper and lower plane portions, and at least one bolt hole is provided at a corresponding portion of the left and right plane portions. This block is an unreinforced block.
( B ) The upper portions of the left and right plane portions of the short rectangular cylinder are connected to the upper plane portion via the arc-shaped surface portion, and the lower portions of the left and right plane portions are connected to the lower plane portion via the arc-shaped surface portion. Make it continuous.
( C ) A stiffener made of a steel plate is disposed in the inner space of the short rectangular tube at right angles to the central axis of the rectangular tube, and the end of this stiffener is the inner surface of the flat portion of the rectangular tube The blocks are manufactured by joining them to each other by welding means. This block is a reinforcing block.
( D ) At least one bolt hole is provided on a bisector parallel to the central axis of the rectangular cylinder in the upper, lower, left and right plane portions of the short rectangular cylinder.
The seismic retrofitting method of the present invention comprises a large number of blocks made of short square cylinders made of iron in a space surrounded by left and right existing columns and upper and lower existing beams of an existing building. Since the bearing wall is constructed by stacking, it can be applied to seismic reinforcement of existing buildings of reinforced concrete, steel reinforced concrete, or steel.
[0006]
【Example】
An Example is shown by FIGS. 1-8, and is an example which applied the invention of this application to the seismic reinforcement of the existing building provided with the frame which consists of an existing pillar, an existing beam, etc. FIG.
As shown in FIG. 8, the existing building 1 is constructed in multiple layers by reinforced concrete, steel reinforced concrete, or steel, and includes a large number of existing pillars 2 (only two are shown) and a large number of existing beams (only six are shown). 3 and the existing floor 4 is provided on the existing beam 3.
[0007]
Unreinforced block 10 is made of steel plate (iron plate), as shown in FIG. 1, a and the length L ₂ in the transverse direction of the side length L ₁ and the longitudinal sides are the same, for example, 400 mm approximately and a, the length L ₃ of the depth, for example, about 200 mm, its weight, for example, is composed of iron short square tubular body is 35 Kg / number of about.
That is, the upper plane portion 11 and the lower plane portion 12 are parallel, the left plane portion 13 and the right plane portion 14 are parallel, and the left and right plane portions 13 and 14 are the upper and lower sides. The left and right plane parts 13 and 14 are arranged at right angles to the plane parts 11 and 12, and the upper portions of the left and right plane parts 13 and 14 are connected to the upper plane part 11 via the arcuate surface part 15. Is formed into a short rectangular tube by connecting the lower portion thereof to the lower plane portion 12 via the arcuate surface portion 15.
Bolt holes Bh are respectively provided at two corresponding positions of the upper and lower plane parts 11 and 12 on a bisector in a direction parallel to the axis of the square cylinder of each flat part 11 to 14 of the short square cylinder. The block 10 is manufactured by providing bolt holes Bh at two corresponding positions of the left and right plane portions 13 and 14 respectively.
[0008]
The reinforcing block 10A disposed on the portion where a large force acts is made of a steel plate (iron plate), and the shape, size, position, etc. of the flat surface portions 11 to 14, the arc-shaped surface portion 15, the bolt hole Bh, etc. are the same as the block 10. is there.
The center of the hollow portion of the steel plate of the rectangular tube body, arranged at right angles quadrangular steel plate stiffeners 16 with a notch 16a at a corner with respect to the axis of the square tubular body, four sides of the stiffeners 16 The reinforcing block 10A is manufactured by joining 16b to the inner side surfaces 11a to 14a of the flat surface portions 11 to 14 of the rectangular tube body by joining means such as welding.
The weight of the block 10 in which the mortar Mt is filled in the hollow part shown in FIG. 3 or the reinforcing block 10A in which the mortar Mt is filled in the hollow part shown in FIG. 7 is about 100 kg / piece, for example.
[0009]
Next, the earthquake-proof reinforcement method of the existing building 1 using the blocks 10 and 10A is demonstrated.
As shown in FIG. 8, the upper surface of the existing floor 4 (or the upper surface of the existing beam 3) immediately above the existing beam 3 of the existing building 1 is made flat by an appropriate means, and a large number of blocks 10 and 10A are formed on this plane. The blocks 10 and 10A are stacked so that the end faces thereof are substantially flush with each other.
That is, as shown in FIG. 8 , the left side of the left existing column 2, the right side of the right existing column 2, the lower surface of the upper existing beam 3, and the existing floor 4 immediately above the lower existing beam 3. A large number of blocks 10 and 10A are stacked in a space S surrounded by the upper surface of each other to provide a partition.
Among the many blocks, a reinforcement block 10A provided with stiffeners on the ones facing the existing pillar 2, the existing beam 3 and the existing floor 4 in the space S is used, and a number of the blocks stacked in the space S shown in FIG. A reinforcing block 10A provided with a stiffener is used for a block corresponding to a V-shaped position indicated by a chain line (that is, a position of two oblique lines). And the unreinforced block 10 which does not provide a stiffener is used for others.
When joining a large number of blocks 10 and 10A, as shown in FIG. 6, the flat portions 11 to 14 of the blocks 10A and 10 facing each other are respectively connected to the bolt holes Bh provided there. Bolts B are passed, and nuts N are screwed into the screw portions of the respective bolts B to join them.
The flat portions 11 to 14 of the reinforcing blocks 10A facing the existing pillar 2, the existing beam 3 and the existing floor 4 in the space S are formed using an adhesive or an adhesive filler 17 with the existing pillar 2, the existing beam. 3 and the existing floor 4.
[0010]
And as shown in FIG. 8, each reinforcement block 10A arrange | positioned in the V-shaped position shown by the dotted line which becomes each reinforcement block 10A arrange | positioned facing the existing pillar 2, the existing beam 3, and the existing floor 4 The inner space is filled with a filler such as mortar or concrete.
In addition, it replaces with the reinforcement block 10A in the example shown in FIG. 8, uses the non-reinforcement block 10 (that is, uses all the non-reinforcement block 10), and each arrange | positions facing the existing pillar 2, the existing beam 3, and the existing floor 4 A filler such as mortar or concrete may be filled in the inner space of each block 10 arranged at the V-shaped position indicated by the reinforcing block 10A and the chain line that forms a line.
It may be different from the lateral sides of length _{L 1} and the length of the longitudinal sides _{L 2} blocks 10, 10A. The number and position of the bolt holes provided in the flat portions 11 to 14 are not limited to the illustrated example.
The blocks 10 and 10A can adjust the weight and proof stress by adjusting the thickness of the steel plate (iron plate) which comprises this, for example.
As the bolt B, for example, a short columnar type having a head without corners is used, and as the nut N, for example, a short columnar type having no corners is used. In this way, when the inner space of the blocks 10 and 11A not filled with the filler is used as a storage space for books, accessories, etc., there is no square space in the storage space, which improves usability.
[0011]
[Effects of the invention]
This invention has the following effects (a) to ( c ) by providing the configuration described in the claims.
(B) The seismic retrofitting method for an existing building according to claim 1 is made up of a number of blocks made of short square cylinders made of iron , and left and right existing columns and upper and lower existing beams. In the space surrounded by, each block is stacked so that the end faces of the blocks are substantially flush with each other, and a partition facing the existing columns and the existing beams among the many blocks constituting the partition In the seismic reinforcement method for existing buildings with existing columns, existing beams, etc., which are joined to existing beams and where adjacent parts of a number of adjacent blocks are joined together to form a bearing wall. Since the inner space of each block placed on the existing column and the part facing the existing beam and the part corresponding to the diagonal line or diagonal line to be a streak is filled with a filler such as mortar , the following (1) to (4 ).
(1) The workability is improved, the construction period is shortened, and the cost can be reduced. In addition, because the bearing wall is made by stacking blocks made of short square cylinders made of iron, construction is easy, and the weight increase is small compared to the reinforced concrete seismic wall, and the influence on the foundation is small.
(2) Since the inner space of each block placed on the existing pillar and the existing beam on which a large force acts and the portion corresponding to the diagonal line or diagonal line that becomes a streak is filled with a filler such as mortar, The proof stress of the block filled with the filler is increased, and a proof load wall with a large proof strength can be easily constructed.
(3) Since fillers such as mortar only fill the inner space of blocks where a large force acts, the weight increase is small compared to reinforced concrete earthquake resistant walls (about 15% of reinforced concrete earthquake resistant walls). , Less impact on the foundation.
(4) The inner space of the block in which the inner space is not filled with a filler such as mortar can be used as a storage space for books, accessories, and the like.
[0012]
( B ) The seismic retrofitting method for an existing building according to claim 2 is composed of a plurality of blocks made of short square cylinders made of iron, and left and right existing columns and upper and lower existing beams. In the space surrounded by, each block is stacked so that the end faces of the blocks are substantially flush with each other, and a partition facing the existing columns and the existing beams among the many blocks constituting the partition In the seismic retrofitting method for existing buildings with existing columns, existing beams, etc., which are joined to existing beams and where adjacent parts of a number of adjacent blocks are joined together to form bearing walls. Using a non-reinforcing block that does not provide stiffeners in the inner space of a short rectangular tube configured as described above, and a reinforcing block that provides stiffeners in the inner space of a short rectangular tube configured of iron, Existing pillars and existing Since the portions corresponding to the diagonal or oblique line to be partial and struts facing the beam is arranged a reinforcing block, the other part to place the unreinforced block, the effects of (1) and (4) In addition, the following effect (5) is achieved.
(5) By configuring the portion of the load-bearing wall on which a large force acts with the reinforcing block, a load-bearing wall having a desired load-bearing force can be easily obtained and the total weight of the load-bearing wall can be suppressed.
(C) The seismic strengthening method for an existing building according to claim 3 is the seismic strengthening method for an existing building according to claim 2, wherein the inner space of the reinforcing block is filled with a filler such as mortar. In addition to the effects (1) and (4), the following effect (6) is achieved.
(6) When the inner space of the reinforcing block is filled with a filler such as mortar, the existing column on which the reinforcing block is arranged, the part facing the existing beam, and the part corresponding to the diagonal line or diagonal line The yield strength of the bearing wall can be further increased.
Moreover, even if the inner space of each reinforcing block is filled with a filler such as mortar, the inner space of each non-reinforcing block is not filled with a filler such as mortar. Has an effect.
[Brief description of the drawings]
FIG. 1 is a front view of an iron block without a stiffener used in the seismic reinforcement method of the embodiment. FIG. 2 is a plan view of the iron block shown in FIG. 1. FIG. 3 is an inner space of the iron block shown in FIGS. Side view showing a section filled with mortar. Fig. 4 Front view of an iron block provided with a stiffener used in the seismic reinforcement method of the embodiment. Fig. 5 Plan view of the iron block shown in Fig. 4. 6] A plan view of the steel block shown in FIG. 4 and FIG. 5 across the joint between them [FIG. 7] FIG. 7 is a longitudinal cross-sectional view of the iron block shown in FIG. 4 and FIG. Side view [Fig. 8] Front view of a frame composed of existing columns, existing beams, etc. reinforced by the seismic reinforcement method of the embodiment [Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Existing building 2 Existing pillar 3 Existing beam 4 Existing floor 10 Unreinforced block 10A Reinforced block 11-14 Plane part 11a-14a Inner side surface 15 Arc-shaped surface part 16 Stiffener 16a Notch 16b Side part Bh Bolt hole B Bolt Mt Mortar N Nut

Claims (3)

The end faces of each block are substantially flush with each other in a space surrounded by the left and right existing pillars and the upper and lower existing beams, with a number of blocks made of short rectangular tubes made of iron. In addition, a partition is formed by stacking, and a part facing the existing column and the existing beam among a large number of blocks constituting the partition is joined to the existing column and the existing beam, and adjacent parts of a large number of adjacent blocks are connected to each other. In the seismic reinforcement method for existing buildings with existing columns, existing beams, etc., which are joined together as bearing walls, diagonal or diagonal lines that act as existing struts and parts that face the existing beams and struts A method for seismic reinforcement of an existing building, characterized in that a filling material such as mortar is filled in an inner space of each block arranged in a portion corresponding to. The end faces of each block are substantially flush with each other in a space surrounded by the left and right existing pillars and the upper and lower existing beams, with a number of blocks made of short rectangular tubes made of iron. In addition, a partition is formed by stacking, and a part facing the existing column and the existing beam among a large number of blocks constituting the partition is joined to the existing column and the existing beam, and adjacent parts of a large number of adjacent blocks are connected to each other. In the seismic retrofitting method for existing buildings with existing columns, existing beams, etc. that are joined together as bearing walls, no stiffener is provided in the inner space of a short rectangular tube made of iron as a block. Using a reinforcing block and a reinforcing block provided with a stiffener in the inner space of a short rectangular tube made of iron, a diagonal line or a striation that is a part that faces an existing column and an existing beam where a large force acts Diagonal line The corresponding parts are arranged a reinforcing block, Retrofit method of existing buildings to other portions, characterized by placing the unreinforced block. 3. The method for seismic reinforcement of an existing building according to claim 2 , wherein the inner space of the reinforcing block is filled with a filler such as mortar.

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