JP4904383B2 - Seismic reinforcement method and structure for existing buildings - Google Patents

Description

  The present invention relates to a seismic reinforcement method and a seismic reinforcement structure for an existing building that improve the earthquake resistance of the existing building.

  For buildings built after the enforcement of the revised Building Standards Act of 1981, earthquake resistance is generally secured, but for buildings built before the enforcement of the revised Building Standards Act of 1986, earthquake resistance There are many things that are insufficient. In fact, most of the buildings that were greatly damaged by the Great Hanshin-Awaji Earthquake were built before the enforcement of the revised Building Standards Act of 1981, and were built after the enforcement of the revised Building Standards Act of 1981. There are reports that there was little damage to the buildings that were constructed.

  Based on the lessons learned from the Great Hanshin-Awaji Earthquake, the government office conducted seismic diagnosis and reinforcement for public buildings built before the enforcement of the revised Building Standards Act of 1981. We are taking measures to reduce damage. For example, the Ministry of Education, Culture, Sports, Science and Technology is promoting the earthquake resistance of public school facilities.

  In addition, in order to promote the earthquake resistance of existing private buildings, each local government has established a subsidy system for seismic diagnosis and reinforcement of existing private buildings.

  Under such circumstances, various methods for improving the earthquake resistance of existing buildings have been proposed to improve the earthquake resistance of existing buildings. For example, in the seismic reinforcement method for an existing building proposed in Patent Document 1, the reinforcing material is separated from the beams positioned at the upper and lower ends of the column on the outer periphery of the column constituting the frame of the existing building. Winding, placing a high-strength mortar between the reinforcing material and the beam, adding an earthquake-resistant element to the opening surrounded by the pillar and the beam, and between the earthquake-resistant element and the reinforcing material It is a method of joining.

Japanese Patent Laid-Open No. 2000-154651 (FIG. 1)

  Since the seismic reinforcement method for existing buildings proposed in Patent Document 1 adds seismic elements to the openings surrounded by pillars and beams, the construction range of the reinforcement work extends over a wide area, which makes the construction large. Had the problem of becoming.

  An object of this invention is to provide the earthquake-proof reinforcement method and earthquake-proof reinforcement structure of the existing building which construction is easy in view of said problem.

  In order to achieve the above object, the seismic reinforcement method for an existing building according to the present invention includes a through hole for filling material injection at a predetermined position around a floor column, and a predetermined area around the column on the upper surface of the floor. A floor steel plate provided with a filler inlet corresponding to the filler injection through hole is disposed in a region where the upper surface of the floor is covered, and a lower surface perpendicular to the lower surface of the beam supporting the floor. A step of disposing an underfloor steel plate corresponding to the above-described steel plate at a position spaced apart by a predetermined distance in a direction, a step of disposing a reinforcing bar between the side surfaces of the adjacent beams, and a lower surface of the floor and an upper surface of the underfloor steel plate A step of disposing a side surface steel plate for enclosing the joint between the column and the beam, and an intermediate band surrounding the column with a predetermined gap at a position where the upper surface contacts the lower surface of the underfloor steel plate And the upper surface of the floor whose lower surface is one floor below the floor The upper surface of the other steel plate on the floor arranged in the region where the upper surface of the floor one floor below the floor is located at the same position or lower surface as the upper surface of the other steel plate on the floor placed in the rolled region. A step of disposing a post-column band surrounding the column with a predetermined gap at a position spaced apart from a plane including the column, and a column surrounding the column between the intermediate band and the sub-column bunt A step of arranging the reinforcing member and a step of injecting the filler from the filler inlet after the arrangement is completed are provided.

  In the seismic reinforcement method, the column reinforcing member may include a corner member disposed at a corner portion of the column and a connecting plate member for connecting the corner members to each other. Or in the said earthquake-proof reinforcement method, you may make it the said column reinforcement member have a plate member whose two cross sections are U-shaped.

  In order to achieve the above object, the seismic reinforcement structure of an existing building according to the present invention is a floor in which a through hole for filling material is formed at a predetermined position around a column, and a predetermined region around the column is punched on the upper surface. A floor steel plate disposed in a rolled area and provided with a filler inlet corresponding to the filler injection through hole, and a vertical downward direction from the lower surface of the beam corresponding to the floor steel plate and supporting the floor The underfloor steel plate disposed at a position spaced apart by a predetermined distance, the reinforcing bars disposed between the side surfaces of the adjacent beams, and the column and the beam between the lower surface of the floor and the upper surface of the underfloor steel plate. A side steel plate arranged to surround the joint, an intermediate band arranged to surround the column with a predetermined gap at a position where the upper surface contacts the lower surface of the underfloor steel plate, and a lower surface from the floor Other floors located in the area covered by the upper surface of the floor below the first floor The column at a position spaced by a predetermined distance from a plane including the upper surface of another steel plate on the floor, the position where the upper surface of the steel plate is flush with the upper surface or the lower surface of the floor is located on the upper surface of the floor below the floor. A columnar band arranged to surround the column with a predetermined gap, and a column reinforcing member arranged to surround the column between the intermediate band and the columnar bunt, The column, the beam, and the floor, the floor steel plate, the floor steel plate, the reinforcing bar, the side steel plate, the intermediate band, the column bottom band, and the column reinforcing member from the filler inlet. It is set as the structure adhere | attached with the filler injected.

  In the seismic reinforcement structure, the column reinforcing member may include a corner member disposed at a corner portion of the column and a connecting plate member for connecting the corner members to each other. Or in the said earthquake-proof reinforcement structure, you may make it the said column reinforcement member have a plate member whose two cross sections are U-shaped.

  According to the seismic strengthening method and seismic strengthening structure of an existing building according to the present invention, the construction range of the reinforcement work does not reach a wide range, so the construction is simple.

It is a fragmentary perspective view of the frame of the existing building which is the reinforcement object of the seismic reinforcement method which concerns on one Embodiment of this invention. It is a top view which shows the 1st process of the earthquake-proof reinforcement method which concerns on one Embodiment of this invention. It is a top view which shows the 2nd process of the earthquake-proof reinforcement method which concerns on one Embodiment of this invention. It is a bottom view which shows the 2nd process of the earthquake-proof reinforcement method which concerns on one Embodiment of this invention. It is a front view which shows the 2nd process of the earthquake-proof reinforcement method which concerns on one Embodiment of this invention. It is the bottom view which illustrated only a reinforcing bar, a pillar, a beam, and a floor. It is a perspective view which shows the 3rd process of the earthquake-proof reinforcement method which concerns on one Embodiment of this invention. It is a front view which shows the 4th process of the earthquake-proof reinforcement method which concerns on one Embodiment of this invention. It is a bottom view which shows the 4th process of the earthquake-proof reinforcement method which concerns on one Embodiment of this invention. It is a front view which shows the 5th process of the earthquake-proof reinforcement method which concerns on one Embodiment of this invention. It is a top view which shows the 5th process of the earthquake-proof reinforcement method which concerns on one Embodiment of this invention. It is a front view which shows the 6th process of the earthquake-proof reinforcement method which concerns on one Embodiment of this invention. It is a front view which shows the modification of the 6th process of the seismic reinforcement method which concerns on one Embodiment of this invention. It is a front view which shows the modification of the 6th process of the seismic reinforcement method which concerns on one Embodiment of this invention.

  Embodiments of the present invention will be described below with reference to the drawings. In the drawings, the same parts are denoted by the same reference numerals.

  FIG. 1 is a partial perspective view of a frame of an existing building which is an object to be reinforced by the seismic reinforcement method according to the embodiment of the present invention. The beam 2 is assembled in a cross shape at the joint between the column 1 and the beam 2, and the beam 2 supports the floor 3.

  First, as pretreatment, roughening is performed on the filler contact surfaces of the column 1 and the beam 2. However, if the bonding strength between the filler contact surfaces of the pillars 1 and 2 and the filler injected in the seventh step described later can be obtained without performing the roughening, the roughening is not performed. May be.

  Next, in the first step, as shown in the top view of FIG. 2, a plurality of through holes 4 and a plurality of filler injection through holes 18 along the vertical direction are formed in the floor 3. Thereafter, the area 5 of the floor 3 where the steel plate on the floor is disposed and the periphery of the pillar 1 are, for example, 30 mm wide so that the top surface of the floor 3 and the top surface of the steel plate on the floor are substantially flush with each other. Keep it.

  Next, in the second step, as shown in the top view of FIG. 3A and the bottom view of FIG.

  The steel plate on the floor is constituted by four divided plates 6A to 6D. Each of the divided plates 6A to 6D has a through hole corresponding to the through hole 4 and a filler inlet corresponding to a plurality of filler injection through holes 18 in the floor 3. 19 is provided. The underfloor steel plate is composed of four divided plates 7A to 7D, and each of the divided plates 7A to 7D is provided with a through hole corresponding to the through hole 4.

  The steel plate on the floor composed of the divided plates 6A to 6D is in contact with the portion 6 on the floor 3 where the steel plate on the floor is disposed, and the steel plate on the floor composed of the divided plates 7A to 7D is spaced apart from the lower surface of the beam 2 by a predetermined distance in the vertical downward direction. In the state, it is supported by a steel bolt 8 and a nut (not shown) paired with the bolt 8. Thereafter, as shown in the front view of FIG. 3C, a plurality of adhesive anchors 9 are driven into the side surface of the beam 2, and the reinforcing bars 10 are disposed between the side surfaces of the adjacent beams 2. The reinforcing bar 10 has a shape as shown in FIG. 3D, for example. 3D is a bottom view illustrating only the reinforcing bar 10, the column 1, the beam 2, and the floor 3. FIG.

  Next, in the third step, as shown in the perspective view of FIG. The side steel plate 11 is a member for enclosing the joint portion between the column 1 and the beam 2 between the lower surface of the floor 3 and the upper surface of the underfloor steel plate, and is composed of a plurality of divided plates.

  Next, in the fourth step, an intermediate band is disposed as shown in the front view of FIG. 5A and the bottom view of FIG. 5B.

  The intermediate band is constituted by U-shaped steel divided parts 12A and 12B. As shown in FIG. 5B, the divided parts 12A and 12B are assembled with each other so that the gap between the column 1 and the intermediate band is 20 to 30 mm, for example, and assembled into a square shape. Thus, by providing a gap between the pillar 1 and the intermediate band, it is possible to cope with the case where the pillar 1 is distorted. A screw hole is formed obliquely with respect to the thickness direction of the intermediate band at the meshing portion 13 so that not only the meshing by the shape of the meshing portion 13 but also the screwing with a bolt is performed when the divided parts 12A and 12B are meshed. Is desirable. Thereafter, the intermediate band is arranged using a construction scaffold so that the lower surface of the underfloor steel plate and the upper surface of the intermediate band are in contact with each other, and is fixed to the column 1 by a steel anchor (not shown).

  Next, in the fifth step, as shown in the front view of FIG. 6A and the bottom view of FIG. 6B, a pillar lower band (only the lower floor is shown, the upper floor is not shown) is disposed.

  The underband band is constituted by U-shaped steel divided parts 14A and 14B. As shown in FIG. 6B, the divided parts 14A and 14B are assembled with each other so as to have a square shape as shown in FIG. Thus, by providing a gap between the column 1 and the band under the column, it is possible to cope with the case where the column 1 is distorted. A screw hole is formed at an angle with respect to the thickness direction of the band under the pillar at the meshing portion 15 so that not only the meshing by the shape of the meshing portion 15 but also the screwing with a bolt is performed when the divided parts 14A and 14B are meshed. It is desirable. Thereafter, the under-column band is fixed to the column 1 with an anchor in a state where the lower surface of the under-band band and the upper surface of the floor steel plate are on the same plane. In the range where the outer periphery of the lower surface of the pillar band can be welded to the floor steel plate on the lower floor, the lower surface of the pillar lower band includes the upper surface of the floor steel plate (only the upper floor is shown, the lower floor is not shown). You may be away from.

  Next, in the sixth step, as shown in the front view of FIG. 7, steel plates 16A and 16B having two U-shaped cross sections are arranged. The lengths of the steel plates 16A and 16B in the longitudinal direction are slightly longer than the distance between the lower surface of the intermediate band and the upper surface of the columnar band, and the gap between the column 1 and the intermediate band and the columnar band is utilized to make the steel plate 16A. The upper end portions of the steel plates 16A and 16B are stored in the gap between the column 1 and the intermediate band, and the lower end portions of the steel plates 16A and 16B are stored in the gap between the column 1 and the lower column band. Here, reinforcing bars may be arranged in the gaps between the steel plates 16A and 16B and the column 1 according to the required seismic strength. Then, the steel plate 16A and the steel plate 16 are welded together. Furthermore, the outer periphery of the lower surface of the above-mentioned pillar lower band and the floor steel plate on the lower floor are welded together. In addition, in order to prevent the filler from leaking out to places other than the gaps between the existing pillar 1, beam 2 and floor 3 and the above-described reinforcing parts in the next seventh step, filling is performed as necessary. It is better to caulk where the material is likely to leak.

  In the final seventh step, a filler (for example, concrete) is poured from the filler inlet 19 to completely fill the gaps between the existing pillar 1, beam 2 and floor 3 and the above-described reinforcing components with the filler. Then, the existing pillar 1, beam 2, and floor 3 are bonded to the above-described reinforcing components.

  The seismic reinforcement structure obtained by the above-described seismic reinforcement method is simple in construction because the construction range of the reinforcement work does not reach a wide range.

<Others>
In the above-described embodiment, the steel plates 16A and 16B having two U-shaped cross sections are arranged in the sixth step, but the steel plate 16 and the lower corner angle 17 may be arranged instead of the steel plates 16A and 16B. Good. In this case, first, as shown in the front view of FIG. 8, four steel lower corner angles 17 having four L-shaped cross sections are arranged. The length in the longitudinal direction of the lower corner angle 17 is slightly longer than the distance between the lower surface of the intermediate band and the upper surface of the lower column band. The angle 17 is moved up and down so that the upper end portion of the lower corner angle 17 is stored in the gap between the column 1 and the intermediate band, and the lower end portion of the lower corner angle 17 is stored in the gap between the column 1 and the band below the column. Here, a reinforcing bar may be arranged in the gap between the lower corner angle 17 and the column 1 according to the required seismic strength. Thereafter, as shown in the front view of FIG. 9, the four steel plates 16 are arranged on each surface of the pillar 1. Here, a reinforcing bar may be arranged in the gap between the steel plate 16 and the column 1 according to the required seismic strength. And the outer periphery of the lower surface of the pillar lower band mentioned above and the floor steel plate of a lower floor are weld-joined.

  In the above-described embodiment, the beam is assembled in a cross shape at the joint between the column and the beam. However, even if the beam is assembled in a T shape or an L shape, the number of beam reinforcing members or the like is adjusted. It is possible to cope with.

  In the above-described embodiment, the cross-sectional shape of the column is rectangular. However, when the cross-sectional shape of the column is not rectangular, this can be dealt with by replacing the upper corner angle and the lower corner angle with hinges.

  Moreover, when some beams are different in height from the other beams, it is possible to cope with this by bending a portion of the underfloor steel plate that is positioned below the partial beams.

  Moreover, you may provide another band which surrounds the pillar 1 in the state which opened the predetermined gap between the intermediate | middle band and the band under a pillar.

1 pillar 2 beam 3 floor 4 through-hole 5 place where the steel plate on the floor is arranged 6A to 6D split plate constituting the steel plate on the floor 7A to 7D split plate constituting the steel plate below the floor 8 bolt 9 adhesive system anchor 10 reinforcing bar 11 side steel plate 12A, 12B Divided parts composing the intermediate band 13 Interlocking parts of the intermediate band 14A, 14B Divided parts composing the lower band band 15 Engaging parts of the lower band band 16, 16A, 16B Steel plate (example of column reinforcing member)
17 Lower corner angle (example of column reinforcement)
18 Filler injection hole 19 Filler injection port

Claims (6)

A through hole for filling the filler is formed at a predetermined position around the pillar of the floor, a predetermined region around the pillar on the upper surface of the floor is provided, and a filler inlet corresponding to the through hole for filling the filler is provided. Placing the steel sheet on the floor in the area where the upper surface of the floor is rolled,
A step of disposing an underfloor steel plate corresponding to the above-described steel plate at a position spaced apart from the lower surface of the beam supporting the floor in a vertical downward direction;
Placing reinforcing bars between the side surfaces of the adjacent beams;
Disposing a side surface steel plate for enclosing the joint between the column and the beam between the lower surface of the floor and the upper surface of the underfloor steel plate;
A step of arranging an intermediate band that surrounds the column with a predetermined gap at a position where the upper surface contacts the lower surface of the underfloor steel plate;
A position where the lower surface is flush with the upper surface of the other steel plate on the floor placed in the region where the upper surface of the floor one floor below the floor is located or the lower surface is the upper surface of the floor one floor below the floor A step of disposing a band under the column that surrounds the column with a predetermined gap from a plane including a top surface of another floor steel plate disposed in the region at a predetermined interval;
Disposing a column reinforcing member surrounding the column between the intermediate band and the under-column bunt;
A method for seismic reinforcement of an existing building, comprising a step of injecting a filler from the filler inlet after the arrangement is completed.   The seismic reinforcement method for an existing building according to claim 1, wherein the column reinforcing member includes a corner member disposed at a corner portion of the column and a connecting plate member for connecting the corner members to each other.   The seismic reinforcement method for an existing building according to claim 1, wherein the column reinforcing member has a plate member having two U-shaped cross sections. Filler injection through-holes are formed at predetermined positions around the pillars, and the fillers are disposed in the area where the predetermined area around the pillars on the upper surface is rolled up and correspond to the through-holes for injection of fillers. A steel plate on the floor provided with an inlet,
Corresponding to the above-mentioned steel plate on the floor, under-floor steel plate arranged at a position spaced apart from the lower surface of the beam supporting the floor in the vertical downward direction,
Rebars arranged between the sides of the adjacent beams;
A side steel plate disposed so as to surround a joint portion between the column and the beam between the lower surface of the floor and the upper surface of the underfloor steel plate,
An intermediate band disposed so as to surround the column with a predetermined gap at a position where the upper surface contacts the lower surface of the underfloor steel plate;
A position where the lower surface is flush with the upper surface of the other steel plate on the floor placed in the region where the upper surface of the floor one floor below the floor is located or the lower surface is the upper surface of the floor one floor below the floor Under-column band arranged to surround the column with a predetermined gap at a position spaced apart from a plane including the upper surface of another floor steel plate arranged in the region;
Between the intermediate band and the under-column bunt, comprising a column reinforcing member disposed so as to surround the column,
The column, the beam, and the floor, the floor steel plate, the floor steel plate, the reinforcing bar, the side steel plate, the intermediate band, the column bottom band, and the column reinforcing member from the filler inlet. A seismic reinforcement structure for existing buildings, which is bonded by injected filler.   The seismic reinforcement structure for an existing building according to claim 4, wherein the column reinforcing member includes a corner member disposed at a corner portion of the column and a connecting plate member for connecting the corner members to each other.   The seismic reinforcing structure for an existing building according to claim 4, wherein the column reinforcing member has a plate member having two U-shaped cross sections.

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