JP2010126999A - Method of reinforcing existing skeleton, and reinforcing structure of existing skeleton - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent sliding break between an adhesively attached steel plate and an existing skeleton in a method of reinforcing an existing building by mounting the steel plate into an opening surrounded by a column-beam frame and constructing a reinforcing structure integrally with the steel plate. <P>SOLUTION: Rugged parts 2A are formed beforehand on the surfaces of a column 2, a beam and a floor of the column-beam frame of concrete construction, and steel plates 23A with anchors 26A erected are bonded to portions with formed rugged parts 2A, with an adhesive 24. Masonry of concrete blocks 12 is carried out to bury the anchors 26A inside to construct an earthquake-resisting wall 11. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a method for reinforcing an existing casing by constructing a reinforcing structure including a steel material bonded to an inner peripheral surface in an opening of an existing casing made of concrete with an adhesive.

  2. Description of the Related Art Conventionally, as a method for seismic reinforcement of an existing concrete building, a method of constructing a reinforced concrete seismic wall in an opening surrounded by a column beam structure of a building has been used. In such a method, in order to connect the seismic wall to the column beam frame, an anchor is placed on the inner peripheral surface of the column beam frame, and the earthquake wall is constructed so that the anchor is embedded. However, when placing an anchor, large vibrations and noises are generated, which is not suitable for construction using a building.

Therefore, the applicants of the present application have proposed a method of constructing a seismic wall so that the steel bars in which the joint reinforcing bars are erected in the openings of the column beam frame are pasted with an adhesive, and the joint reinforcing bars are embedded ( For example, see Patent Literature 1 and Patent Literature 2). According to such a method, since the anchor placing work is not required, it is possible to prevent generation of large vibrations and noises during construction.
JP 2004-250904 A JP 2008-208643 A

  However, in the connection part where the adhesive is interposed between the earthquake-resistant wall and the steel plate, compared with the adhesion strength at the interface between the steel plate and the adhesive, the concrete constituting the column beam frame of the existing building Since the adhesion strength at the interface with the adhesive is small, there has been a problem that slip fracture is likely to occur at the interface between the concrete and the adhesive.

  In addition, in order to prevent such slip failure, a method is provided in which a hole is formed in the steel plate, an anchor is placed in the column beam frame, the steel plate is arranged so that the anchor passes through the hole, and the steel plate is fixed by a bolt. Can be considered. However, in this method, since it is necessary to drive the anchor at a predetermined position with high accuracy, it takes time for construction. In addition, vibration and noise are generated during construction.

  The present invention has been made in view of the above problems, and its purpose is to reinforce an existing building by attaching a steel plate in an opening surrounded by a column beam frame and constructing a reinforcing structure integrally with the steel plate. In doing so, it is to improve the proof stress between the steel plate attached by adhesion and the existing housing, and to prevent slip failure.

  In the method for reinforcing an existing casing of the present invention, a reinforcing structure including a steel material is fixed in an opening of an existing casing made of concrete by adhering the steel material to an inner peripheral surface of the opening with an adhesive. A method of reinforcing a casing for reinforcing the existing casing, wherein a recess is provided in advance on the inner peripheral surface of the opening of the existing casing.

  In the above-described reinforcing method, the reinforcing structure is constructed such that the connecting steel plate is bonded to the inner peripheral surface of the opening with an adhesive, and the connecting reinforcing bars are erected, and the connecting reinforcing bars are embedded therein. You may be comprised with a seismic wall.

  Further, the reinforcing structure includes a peripheral part attached to at least the upper and lower surfaces of the opening of the existing housing, and a brace part provided to connect the peripheral part attached to the upper and lower sides of the opening. It is composed of a reinforcing structure in which a frame material made of a steel material is disposed in a portion corresponding to the peripheral portion and the brace portion, and a cement-based material is placed so as to be integrated with the frame material, and the peripheral portion is configured. A frame material to be adhered may be adhered to the inner peripheral surface of the opening by an adhesive.

Further, the reinforcing structure of the existing casing of the present invention is a reinforcing structure including a steel material built in the opening of the existing casing made of concrete, and a recess is formed on the inner peripheral surface of the opening of the existing casing. The steel material is fixed to the opening by adhering it to the inner peripheral surface of the opening of the existing casing with an adhesive.

  ADVANTAGE OF THE INVENTION According to this invention, by forming a recessed part in the surface of the concrete which comprises a housing, the adhesive force between the concrete which comprises a housing and an adhesive agent improves, and it can prevent that a slip fracture | rupture arises.

Hereinafter, an embodiment of a method for reinforcing an existing housing according to the present invention will be described in detail with reference to the drawings.
FIG. 1 is a front view showing a column beam frame 10 reinforced by a method for reinforcing an existing housing according to the present embodiment. As shown in FIG. 1, the method for reinforcing an existing frame of the present embodiment is to construct a concrete block-structure seismic wall 11 in an opening 30 surrounded by a column beam frame 10 of a reinforced concrete structure, thereby This is a method of reinforcing the frame 10. The earthquake-resistant wall 11 is configured by, for example, stacking a plurality of concrete blocks 12 vertically and horizontally, and vertical and horizontal bars are arranged along the joint between the concrete blocks 12.

  2A and 2B are diagrams showing the concrete block 12, in which FIG. 2A is a plan view, FIG. 2B is a side view, and FIG. 2C is a front view. As shown in the figure, the concrete block 12 is a rectangular block having a size surrounded by the vertical and horizontal division lines, and the horizontal and vertical lines of the concrete block 12 are formed on the top, bottom, left and right surfaces at the joint position with the adjacent blocks. A semicircular joint groove 12A for inserting a line is formed.

  3A is a horizontal sectional view showing a joint structure 20A of the pillar 2 and the earthquake-resistant wall 11, FIG. 3B is a sectional view taken along the line BB ′ in FIG. 3A, and FIG. It is CC 'sectional drawing in (B). As shown in the figure, a steel plate 23 </ b> A to which a long nut 25 is welded is attached to the surface of the column 2 by an adhesive 24, and a horizontal anchor 26 </ b> A is connected to the long nut 25. The seismic wall 11 is constructed such that the transverse anchor 26A is embedded therein. A circular recess 2A is formed on the surface of the column 2 with a gap in the vertical direction. The adhesive 24 for bonding the steel plate 23 </ b> A is cured in a state of entering the recess 2 </ b> A formed on the surface of the concrete constituting the pillar 2.

  4A is a vertical cross-sectional view showing a joint structure 20B of the floor 3 or the beam 1 and the earthquake-resistant wall 11, and FIG. 4B is a cross-sectional view taken along line BB ′ in FIG. FIG. 5 is a cross-sectional view taken along the line CC ′ in FIG. As shown in the figure, the joint structure 20B of the floor 3 and the beam 1 and the earthquake-resistant wall 11 has substantially the same structure as the joint structure 20A of the column 2 and the earthquake-resistant wall 11, but in this joint structure 20B, the vertical anchor 26B Is attached directly to the steel plate 23B by welding. In addition, circular recesses 3A and 1A are formed on the surface of the floor 3 or the beam 1 at intervals in the horizontal direction. The adhesive 24 for bonding the steel plate 23B is hardened in a state of entering into the recesses 3A and 1A formed on the concrete surfaces constituting the floor 3 and the beam 1.

  As described above, the adhesive 24 for bonding the steel plates 23A and 23B has entered the recesses 2A, 1A, and 3A formed on the surface of the concrete constituting the frame (that is, the beam 1, the column 2, and the floor 3). By curing in the state, the adhesive strength in the shearing direction between the adhesive 24 and the concrete constituting the frame is improved, and it is possible to prevent the occurrence of slip failure between the adhesive 24 and the concrete constituting the frame. .

Hereinafter, a method for constructing the reinforcing structure 20 of the present embodiment will be described.
First, at a position where the steel plates 23A and 23B on the inner peripheral surfaces of the beam 1, the column 2 and the floor 3 constituting the column beam frame 10 are to be attached, a plurality of recesses 1A, 2A, 3A is formed.

  Next, as shown in FIG. 5, the steel plate 23 </ b> A is formed at a position where the beams 1, 2, and the inner peripheral surface recesses 1 </ b> A, 2 </ b> A and 3 </ b> A of the floor 3 are formed. , 23B are adhered by an adhesive 24. At this time, the steel plate 23B to which the vertical anchor 26B is welded is attached to the floor 3 and the beam 1 so that the vertical anchor 26B is disposed at a position corresponding to the joint between the concrete blocks 12. Moreover, the steel plate 23A to which the long nut 25 is attached by welding is attached to the column 2 so that the long nut 25 follows the lane marking. As the adhesive 24 for attaching the steel plates 23A and 23B, an epoxy resin or the like can be used.

Next, the concrete blocks 12 are stacked. FIG. 6 is a view for explaining a method of assembling the concrete blocks 12.
First, as shown in FIG. 6 (A), the first concrete block 12 is placed in the corners of the floor 3 and the pillar 2. At this time, the long nut 25 does not protrude from the joint groove 12A of the concrete block 12, and the vertical anchor 26B protruding from the floor 3 protrudes to the center of the semicircle of the joint groove 12A. 12 can be installed.

  Then, the concrete block 12 is arrange | positioned to the pillar 2 of the other side. At this time, since the thickness of the concrete block 12 is equal to the width of the steel plate 23B, the concrete block 12 can be accurately arranged by arranging the concrete block 12 according to the steel plate 23B.

  After the first stage arrangement, as shown in FIG. 6B, the horizontal anchor 26A is screwed and fixed to the long nut 25 attached to the steel plate 23A attached to the column 2. Since this screwing operation can be performed in the space formed by the joint groove 12A on the upper side of the concrete block 12, it can be performed without difficulty.

  Thereafter, the vertical stripes 27B are connected to the vertical anchors 26B by a number line. Similarly, the horizontal bars 27A are connected to the horizontal anchors 26A, and the vertical bars 27B and the horizontal bars 27A are bound at the crossing positions with a line or the like, and then the joint concrete is filled into the joint grooves 12A of the concrete block 12. As a result, the first-stage concrete block row is completed.

  Furthermore, after that, as shown in FIG. 6 (C), the second and subsequent concrete blocks 12 are assembled, but they may be assembled in the same procedure as the first stage. Thereafter, as shown in FIG. 6 (D), the seismic wall 11 is constructed by repeating the masonry of the concrete blocks 12, the arrangement of the vertical bars 27B and the horizontal bars 27A, and the filling of joint concrete until reaching the uppermost stage. be able to.

  Through the above process, the seismic wall 11 and the column beam frame 10 are integrated, and the seismic reinforcement of the column beam frame 10 is completed.

  According to the present embodiment, by forming the recesses 1A, 2A, and 3A on the surface of the existing chassis (beam 1, column 2 and floor 3), the adhesion strength between the adhesive 24 and the existing chassis is improved. Therefore, it is possible to prevent the occurrence of slip failure between the existing casing and the adhesive 24. As a result, an adhesion strength comparable to that between the steel plates 23A, 23B and the adhesive 24 can be expected between the existing housing and the adhesive 24, and the strength of the entire reinforcing structure is improved. .

  Further, in the method of fixing a steel plate with an anchor placed on a housing, it is necessary to place the anchor at a predetermined position with high precision. However, in the present embodiment, it is high when forming the recesses 1A, 2A, 3A. Since position accuracy is not required, construction can be performed without much effort.

  In this embodiment, the circular recesses 1A, 2A, 3A are formed on the inner periphery of the opening of the column beam frame 10, but the shape of the recesses 1A, 2A, 3A is not limited to this, and may be a rectangular shape or the like. It may be formed side by side in a plurality of rows.

In the present embodiment, as the reinforcing structure, the steel plates 23A and 23B in which the anchors 26A and 26B are erected are attached to the inner peripheral surface of the opening of the column beam frame 10 with the adhesive 24, and the anchors 26A and 26B are embedded inside. As described above, the case where the seismic wall 11 formed by connecting the concrete blocks 12 vertically and horizontally has been described. For example, in the method of constructing the seismic wall by performing reinforcement and concrete placement work at the site, The present invention can be applied, and in short, the method for constructing a seismic wall is not limited to the above embodiment.
Furthermore, the present invention is not limited to a reinforcing structure in which a seismic wall is constructed in a column beam frame, but can be applied to any reinforcing structure in which a steel material is bonded to the inner periphery of the column beam frame.

  7A and 7B are diagrams showing a reinforcing structure according to another embodiment, in which FIG. 7A is a front view, FIG. 7B is a vertical cross-sectional view, and FIG. 7C is a cross-sectional view along CC ′ in FIG. ) Is a cross-sectional view along DD 'in (A). As shown in the figure, in the present embodiment, the peripheral frame 120 attached along the column beam frame 10, the central portion of the upper side of the peripheral frame 120, and both lower corner portions are provided. It comprises a pair of brace members 130.

  The peripheral frame 120 includes a rectangular steel pipe 121 having a rectangular cross section divided into a plurality of sections, a mortar grout 122 placed in a gap between the square steel pipe 121 and the adjacent square steel pipe 121, and the adjacent square steel pipe 121. And a joining reinforcing bar 123 embedded in the mortar grout 122. The square steel pipe 121 is arranged in a frame shape along the surface inside the opening of the column beam frame 10, and is bonded by an adhesive 24.

  The mortar grout 122 is placed in the inside of each square steel pipe 121 and in the gap between the adjacent square steel pipes 121. The compressive load acting on the peripheral frame 120 is mainly borne by the mortar grout 122. In addition, since the mortar grout 122 is surrounded and restrained by the square steel pipe 121, the compressive yield strength is improved.

  The joining rebar 123 is embedded in the mortar grout 122 between the adjacent square steel pipes 121. The stress acting on one of the adjacent square steel pipes 121 is transmitted to the joining rebar 123 through the mortar grout 122 and is transmitted from the joining rebar 123 to the other square steel pipe 121 through the mortar grout 122, similarly to the lap joint of the reinforcing bars. Communicated. In this manner, the tensile stress can be transmitted between the adjacent square steel pipes 121, and the tensile stress acting on the peripheral frame 120 can be borne by the square steel pipe 121 and the joining rebar 123.

  Thus, the square steel pipe 121, the mortar grout 122, and the joining rebar 123 that constitute the peripheral frame 120 can be united to bear stress and function as a frame-like structure. In addition, the peripheral frame 120 has an outer peripheral surface of the square steel pipe 121 bonded to the inner surface of the column beam frame 10 with an adhesive 23, and is integrated with the column beam frame 10.

  The brace member 130 includes a steel pipe 131 having a rectangular cross section and a mortar grout 132 that is filled in the steel pipe 131 and hardened integrally with the steel pipe 131. The compressive load acting on the brace member 130 is mainly borne by the mortar grout 132, and the tensile load is mainly borne by the steel pipe 131. Further, since the steel pipe 131 is restrained in a state of surrounding the mortar grout 132, the compression strength of the brace member 130 is improved.

  Even when the column beam frame 10 is reinforced by such a reinforcing structure, the adhesion between the square steel pipe 121 and the adhesive 24 between the square steel pipe 121 of the reinforcing structure and the inner peripheral surface of the column beam frame 10 is compared. Thus, there arises a problem that the adhesive force between the inner peripheral surface of the column beam frame 10 and the adhesive 24 is small. For this reason, as in the above embodiment, by forming a recess in the inner peripheral surface of the column beam frame 10, the adhesion strength in the shear direction between the adhesive 24 and the column beam frame 10 is improved. In other words, it is possible to prevent the occurrence of slip failure between the adhesive 24 and the concrete constituting the column beam frame 10.

  In the above embodiment, the square steel pipe 121 is used as the frame material constituting the peripheral frame 120. However, the present invention is not limited to this, and a configuration using groove steel (channel steel) is also possible. FIGS. 8A and 8B are diagrams showing an embodiment in which a grooved steel 221 is used as a frame member, where FIG. 8A is a vertical cross-sectional view and FIG. 8B is a cross-sectional view along BB ′ in FIG. FIG. 6C is a cross-sectional view taken along the line CC ′ in FIG. In addition, about the site | part of the same structure as the said embodiment, the same code | symbol is attached | subjected and description is abbreviate | omitted. As shown in the figure, in this embodiment, a grooved steel 221 is used as a frame material constituting the peripheral frame 120 in place of the square steel pipe 121, and the grooved steel 221 is attached to the column beam frame 10 with an adhesive 24. It is attached. When the channel steel 221 is used, a stud 224 is attached to the inner surface of the channel steel 221 in order to ensure adhesion between the mortar grout 122 and the channel steel 221. Even in the case of constructing a reinforcing structure having such a configuration, a slip failure occurs between the adhesive 24 and the surface of the column beam frame 10 by forming a recess in the inner peripheral surface of the column beam frame 10. Can be prevented.

  Furthermore, in the embodiment shown in FIGS. 6 and 7, the peripheral frame 120 is provided on the entire circumference along the inner circumference of the column beam frame 10, but not limited to this, as shown in FIG. It is good also as what is provided only in the part which hits the upper and lower sides of the opening 30. FIG.

It is a front view which shows the column beam frame reinforced by the reinforcement method of the existing frame of this embodiment. It is a figure which shows a concrete block, (A) is a top view, (B) is a side view, (C) is a front view. (A) is a horizontal sectional view showing a joint structure between a column and a seismic wall, (B) is a sectional view taken along the line BB ′ in FIG. (A), and (C) is a sectional view in FIG. It is -C 'sectional drawing. (A) is a vertical sectional view showing a joint structure of a floor or a beam and a seismic wall, (B) is a BB ′ sectional view in FIG. (A), (C) is the same figure (B). It is CC 'sectional drawing in FIG. It is a figure which shows the column beam frame of the state which stuck the steel plate. It is a figure for demonstrating the method of assembling a concrete block. It is a figure which shows the reinforcement structure of another embodiment, (A) is a front view, (B) is a vertical sectional view, (C) is a CC 'sectional view in (A), (D) is (A) It is DD 'sectional drawing in). It is a figure which shows embodiment at the time of using a channel steel as a frame material, (A) is a vertical sectional view, (B) is a BB 'sectional view in (A), (C) FIG. 6 is a cross-sectional view taken along the line CC ′ in FIG. It is a front view which shows the case where a periphery frame is provided only in the part which hits the upper and lower sides of the opening of a column beam frame.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Beam 1A, 2A, 3A Concavity 2 Column 3 Floor 10 Column beam frame 11 Earthquake resistant wall 12 Concrete block 12A Joint groove 20 Reinforcement structure 20A, 20B Joint structure 23A, 23B Steel plate 24 Adhesive 25 Long nut 26A Horizontal anchor 26B Vertical anchor 27A Horizontal bar 27B Vertical bar 30 Opening 120 Peripheral frame 121 Square steel pipe 122 Mortar grout 123 Jointed reinforcing bar 130 Brace member 131 Steel pipe 132 Mortar grout 221 Channel steel 224 Stud

Claims (4)

A reinforcing structure comprising a steel material is fixed in an opening of an existing concrete frame by adhering the steel to the inner peripheral surface of the opening with an adhesive, thereby reinforcing the existing frame. A reinforcing method,
A method for reinforcing an existing casing, wherein a recess is provided in advance in a portion of the inner peripheral surface of the opening of the existing casing where the steel material is bonded. The reinforcing method according to claim 1,
The reinforcing structure is bonded to the inner peripheral surface of the opening by an adhesive, and a connecting steel plate in which connecting reinforcing bars are erected, and
A method for reinforcing an existing frame, comprising: a seismic wall constructed so that the connection reinforcing bar is embedded therein. The reinforcing method according to claim 1,
The reinforcing structure includes a peripheral portion attached to at least the upper and lower surfaces of the opening of the existing housing, and a brace portion provided so as to connect the peripheral portion attached to the upper and lower sides of the opening. , A frame material made of steel is disposed in the portion corresponding to the peripheral part and the brace part, and consists of a reinforcing structure formed by placing a cement-based material so as to be integrated with the frame material,
A method for reinforcing an existing casing, wherein a frame material constituting the peripheral portion is attached to an inner peripheral surface of the opening portion with an adhesive. A reinforcing structure for an existing frame comprising a steel material built in an opening of an existing frame made of concrete,
A recess is formed in a portion of the inner peripheral surface of the opening of the existing housing to which the steel material is bonded,
A reinforcing structure for an existing housing, wherein the steel material is bonded to the inner peripheral surface of the opening of the existing housing with an adhesive, and is fixed to the opening.