KR20160039143A - Seismic strengthening structure and method for existing building - Google Patents

Seismic strengthening structure and method for existing building Download PDF

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Publication number
KR20160039143A
KR20160039143A KR1020157022838A KR20157022838A KR20160039143A KR 20160039143 A KR20160039143 A KR 20160039143A KR 1020157022838 A KR1020157022838 A KR 1020157022838A KR 20157022838 A KR20157022838 A KR 20157022838A KR 20160039143 A KR20160039143 A KR 20160039143A
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KR
South Korea
Prior art keywords
shaft
steel
existing building
hole
concrete
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KR1020157022838A
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Korean (ko)
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KR101634512B1 (en
Inventor
유타카 오다
타카시 카미야
요이치 우에다
미네리 스즈키
Original Assignee
야하기 컨스트럭션 코., 엘티디
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Priority to JPJP-P-2014-181482 priority Critical
Priority to JP2014181482A priority patent/JP5694596B1/en
Application filed by 야하기 컨스트럭션 코., 엘티디 filed Critical 야하기 컨스트럭션 코., 엘티디
Priority to PCT/JP2015/066904 priority patent/WO2016035411A1/en
Publication of KR20160039143A publication Critical patent/KR20160039143A/en
Application granted granted Critical
Publication of KR101634512B1 publication Critical patent/KR101634512B1/en

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    • EFIXED CONSTRUCTIONS
    • E04BUILDING
    • E04GSCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G23/00Working measures on existing buildings
    • E04G23/02Repairing, e.g. filling cracks; Restoring; Altering; Enlarging
    • E04G23/0218Increasing or restoring the load-bearing capacity of building construction elements
    • EFIXED CONSTRUCTIONS
    • E04BUILDING
    • E04GSCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G23/00Working measures on existing buildings
    • E04G23/02Repairing, e.g. filling cracks; Restoring; Altering; Enlarging
    • EFIXED CONSTRUCTIONS
    • E04BUILDING
    • E04BGENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B1/00Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
    • E04B1/62Insulation or other protection; Elements or use of specified material therefor
    • E04B1/92Protection against other undesired influences or dangers
    • E04B1/98Protection against other undesired influences or dangers against vibrations or shocks; against mechanical destruction, e.g. by air-raids

Abstract

An earthquake-proof reinforcing structure of an existing building includes a plurality of shaft members (22) into which a leading end is inserted in an existing building, a steel material (23) having a plurality of insertion holes (28) in which a base end portion of a plurality of shaft members (22) A holding portion 31 provided at the base end portion of the shaft member 22A inserted in the insertion hole 28A and holding the steel member 23; And a concrete body 24 integrated with the existing building including the steel material 23 therein.

Description

[0001] SEISMIC STRENGTHENING STRUCTURE AND METHOD FOR EXISTING BUILDING [0002]
The present invention relates to an earthquake-proof reinforcement structure of an existing building and an earthquake-reinforcement method of an existing building.
Conventionally, a plurality of anchor bolts are connected to a column or girder of an existing building by an earthquake-reinforcement method of an existing building, and a long steel plate is fixed to the anchor bolt by a nut so as to be fitted on both sides thereof. Then, concrete is placed around the steel plate There is a method in which the steel plates are bonded to a concrete building body (for example, Patent Document 1).
Patent Document 1: JP-A-10-152997
However, in the existing building, the position of the column or the girder is different from the design or the reinforcing bar is built in, and the anchor bolt can not be inserted, so that the anchor bolt can not be installed at the predetermined position. Further, when the anchor bolt is inserted into the predetermined position, the anchor bolt that is inserted is inclined with respect to the outer surface of the column or the girder, and the position of the base end where the nut is installed may be shifted.
In consideration of this point, when the anchor bolt is inserted into the steel plate to form the through hole to form the through hole, if the insertion position of the anchor bolt is displaced in the field or inclination occurs in the anchor bolt, It is easy to insert the base of the anchor bolt.
However, if the insertion hole is formed to be larger than the diameter of the anchor bolt, the nut is pinched and when the concrete is laid, the concrete is not poured into the insertion hole and the cavity is left so that the integrity of the anchor bolt and the concrete There is a problem that it becomes.
The present invention has been made in view of the problems existing in the prior art. The object of the present invention is to provide an earthquake-proof reinforcement structure of an existing building capable of suppressing deterioration of integration with a concrete body of a shaft material and a steel material while satisfactorily securing workability when a steel material is installed on a plurality of shaft materials inserted into an existing building And a method of reinforcing an earthquake of an existing building.
An earthquake-proof reinforcement structure of an existing building according to an aspect of the present invention includes: a plurality of shaft members into which a leading end is inserted in an existing building; a steel material having a plurality of insertion holes through which base portions of the plurality of shaft members can be inserted; A holding portion provided at the proximal end portion of any one of the shaft members inserted through the insertion hole and provided so as to be positioned closer to the proximal end than the steel member at the proximal end portion of the other shaft member inserted through the insertion hole, And a concrete body including the steel material inside and integrated with the existing building.
According to this structure, it is possible to regulate the movement of the steel material toward the base end side by the release preventing portion provided at a position closer to the base end than the steel material in the other shaft member by sandwiching the steel material with the gripping portion provided in any shaft member, have. Also, since concrete is introduced into the insertion hole of the shaft member provided with the separation preventing portion, while the concrete does not flow into the insertion hole of the steel material sandwiched by the holding portion, even if the insertion hole is formed large, The lowering of the integrity of the shaft member and the steel body with the concrete body is suppressed. Therefore, by making the insertion hole large enough to allow the proximal end of the shaft member to be interlocked, it is possible to suppress the deterioration of the integrity of the shaft member and the steel material with the concrete body while securing the workability when the steel material is installed on the plurality of shaft members inserted into the existing building .
In the earthquake-proof reinforcement structure of the existing building, at least three of the shaft members are inserted, and the steel member has at least three of the through holes. The number of the shaft members, Is preferable.
According to this configuration, the number of the shaft members to be provided with the release preventing portions is made larger than the number of shaft members to which the sandwiching portions are mounted, thereby increasing the number of the insertion holes into which the concrete flows, thereby enhancing the integrity of the shaft members and the steel members with the concrete bodies .
According to an aspect of the present invention, an earthquake-proof reinforcement structure of an existing building includes: a plurality of shaft members into which a leading end is inserted into an existing building; a steel material having a plurality of insertion holes through which base portions of the shaft material can be pierced; Wherein the shaft member is inserted into the insertion hole and is connected to the steel member by a holding portion provided on the base end portion and the other shaft member inserted through the insertion hole is inserted into the insertion hole, And is connected to the steel material by the concrete body filled in the through hole.
According to this structure, the steel material can be sandwiched between the holding portions provided on any shaft member, and the position of the steel material can be made appropriate. Also, since the concrete is introduced into the insertion hole where the shaft member not provided with the holding portion is inserted, while the concrete does not flow into the insertion hole of the steel member sandwiched by the holding portion, the shaft member and the steel material You can connect. Therefore, when the steel material is inserted into a plurality of shaft members inserted into the existing building by increasing the insertion hole so that the proximal end portion of the shaft material can be connected, it is possible to suppress deterioration of the integrity of the shaft member and the steel material with the concrete body while maintaining good workability.
According to one aspect of the present invention, an earthquake-proof reinforcement structure of an existing building comprises three or more shafts having a leading end portion fitted in an existing building, a steel material having three or more through holes formed so as to allow the base end portion of the shaft material to flow, Wherein the three or more shafts inserted through the insertion hole have a first shaft member mounted on the base end portion for holding the steel material and a second shaft member having a base end closer to the base end than the steel material, And a third shaft member on which the separation preventing portion and the sandwiching portion are not provided.
According to this structure, the steel material can be sandwiched by the holding portions provided on any shaft member, and the position of the steel material can be made appropriate. Also, since the concrete is not introduced into the insertion hole of the steel material sandwiched by the nipping portion, but the concrete is introduced into the insertion hole where the second shaft material and the third shaft material not provided with the nipping portion are inserted, 2-shaft and 3-shaft can be connected with steel. Therefore, when the steel material is installed on the plurality of shaft materials inserted into the existing building by increasing the insertion hole so that the proximal end portion of the shaft material can flow, it is possible to restrain the integration of the shaft material and the steel material with the concrete body while securing good workability.
In the seismic retrofitting structure of the existing building, it is preferable that the shaft member is provided with the sandwiching section on the shaft member disposed at a position where the column member and the girder member intersect with the column member and the girder member of the existing building .
According to this configuration, the steel material is sandwiched between the columnar body and the girder body, and the steel material is efficiently positioned to the shaft material before the concrete is inserted.
In the seismic retrofitting structure of the existing building, it is preferable that the steel material is disposed at a position along a column and a girder body of the existing building to constitute a frame body, and the holding unit is disposed at least at an angled portion of the frame body .
According to this construction, when the steel body is disposed at a position along the column body and the girder body of the existing building to constitute the frame body, the gripping portion is disposed at the angled portion of the frame body so that the steel material is efficiently positioned .
According to an aspect of the present invention, there is provided an earthquake-proofing method for an existing building, comprising: a shaft member mounting step of connecting a front end portion of a plurality of shaft members to an existing building; And a holding step of holding the steel material by a holding portion provided at a base end portion of any one of the shaft materials inserted through the insertion hole and a base end portion of the other end of the shaft material inserted through the insertion hole, And a pouring step of pouring concrete so as to surround the periphery of the steel material at a position in contact with the preexisting building.
According to this structure, the same operational effect as that of the earthquake-proof reinforcement structure of the existing building can be obtained.
According to one aspect of the present invention, there is provided a seismic retrofitting method for an existing building, including: a shaft member mounting step of connecting the front ends of a plurality of shaft members to an existing building; and a step of inserting the base ends of the shaft members into a plurality of insertion holes provided in the steel member, A step of inserting and sandwiching the steel material by a holding part provided at a proximal end portion of any of the shaft members inserted through the insertion hole; and a step of placing concrete so as to surround the steel material at a position in contact with the existing building, And a pouring step for pouring concrete into the insertion hole where the shaft member is inserted.
According to this structure, the same operational effect as that of the earthquake-proof reinforcement structure of the existing building can be obtained.
According to one aspect of the present invention, there is provided an earthquake-proof reinforcement method for an existing building, comprising: a shaft material installation step of connecting three or more shaft ends of a shaft material to an existing building; A step of sandwiching the steel material by a sandwiching portion provided at a base end portion of a certain shaft material inserted through the insertion hole; and a base end portion of a shaft material different from any of the shaft materials to which the sandwiching portion is mounted, Of the three or more shafts in a state in which the departure-avoiding portion and the shaft-like member not provided with the holding portion are left in a part of the three or more shaft members, The concrete is poured into the insertion hole so as not to fit in the nipping portion, Provided with a cast-in-place process.
According to this structure, the same operational effect as that of the earthquake-proof reinforcement structure of the existing building can be obtained.
According to the plurality of aspects of the present invention, it is possible to suppress the lowering of the integrity of the shaft member and the steel material with the concrete body while maintaining the good workability when the steel material is installed on the plurality of shaft materials inserted into the existing building.
1 is a front view schematically showing an earthquake-proof reinforcement structure of an existing building according to an embodiment.
2 is a cross-sectional view showing a reinforcing portion provided in an existing building.
3 is a cross-sectional view showing a reinforcing portion provided in an existing building.
4 is an exploded perspective view showing a side member, a steel member, a departure-avoiding portion, and a holding portion that constitute the reinforcing portion.
Fig. 5 is an explanatory diagram schematically showing a concrete pouring.
Fig. 6 is a front view (a) for explaining a first modification of the reinforcing portion, a front view (b) for explaining a second modification of the reinforcing portion, and a front view (c) for explaining a third modification of the reinforcing portion, to be.
7 is a cross-sectional view for explaining a fourth modification of the reinforcing portion.
Hereinafter, embodiments of an earthquake-proof reinforcement structure of an existing building and an earthquake-reinforcement method of an existing building will be described with reference to the drawings.
1, a reinforcing portion 21 for reinforcing earthquake-proof is connected to a column (column 12), which is a structure supporting the existing building 11, and a beam 13, . The reinforcing portion 21 is formed in a rectangular frame shape so as not to block the opening portion 14 such as a window or a doorway provided in the existing building 11, for example. The reinforcing portion 21 of the rectangular frame shape can be arbitrarily enlarged according to the number of the existing buildings 11 and the position of the columnar body 12, for example, as indicated by a chain double-dashed line in Fig.
2, the reinforcing portion 21 includes a plurality of shaft members 22 whose front ends are connected to the columnar body 12 of the existing building 11 and the girder body 13, And a concrete body 24 which is integrated with the existing building 11 inside the steel material 23. [ That is, the reinforcing portion 21 is a concrete body containing a steel material. In the present embodiment, the steel material 23 is, for example, a long steel plate and appropriately joined according to the arrangement of the columnar body 12 and the girder body 13, so that the columnar body 12 of the existing building 11, (13), and forms a rectangular frame when viewed from the front. Also, the joining of the steel material 23 may be performed by welding, or may be carried out by sandwiching the bolt and the nut.
The reinforcing portion 21 may have an inclined reinforcing member 25 installed diagonally across the column 12 and the girder body 13 as indicated by chain double-dashed lines in Fig. The inclined reinforcing member 25 may be a precast concrete body covered with concrete except for both ends connected to the steel material 23 and may be a concrete damper such as a stretchable rod- As shown in Fig.
3, the shaft member 22 has the column body 12 (or the girder body 13) of the existing building 11 so that the overall length (the length in the lateral direction in Fig. 3) is shorter than the shaft member 22, (The left part in Fig. 3) is inserted into the insertion hole 15 formed in the front end portion of the front end portion. At this time, the proximal end portion (the right end portion in Fig. 3) of the shaft member 22 protrudes from the columnar body 12 (or the girder body 13) of the existing building 11.
The steel material 23 has a plurality of insertion through holes 28 so that the proximal end portions of the plurality of shaft members 22 can be opened. The insertion hole 28 is previously positioned and formed according to the design of the existing building 11 before the shaft member 22 is inserted. The insertion hole 15 into which the shaft member 22 is inserted is formed on the site for installation at a position corresponding to the insertion hole 28 of the steel material 23 but is different from the actual structure design drawing of the existing building 11 Or reinforcing bars are embedded, the formation position of the insertion hole 15 may deviate from the predetermined position. When the forming angle of the insertion hole 15 is inclined with respect to the wall, the shaft member 22 inserted into the insertion hole 15 may be inclined and deviate from the insertion hole 28 at the position of the base end.
The insertion through hole 28 is formed in such a manner that the shaft diameter of the shaft member 22 can be adjusted so that the shaft member 22 can be inserted and passed therethrough even when the insertion hole 15 is displaced or the shaft member 22 is inclined. So that the shaft member 22 is free to flow. For example, when the diameter of the insertion hole 28 is D1 and the shaft diameter of the shaft member 22 is D2, a clearance of about D1 = D2 + (D2 + 20 mm) in the case where it can be inserted / penetrated into the through hole 28. [ In this case, even if the positions of the base ends of the plurality of shaft members 22 are shifted, the installation work of the steel material 23 can be facilitated.
The holding portion 31 is mounted on the base end portion of the shaft member 22 or 22A inserted in the insertion hole 28A as a part of the insertion hole 28 so as to sandwich the steel material 23 therebetween. The holding portion 31 is composed of two pairs of washers 32 and a nut 33, for example. When the holding portion 31 is constituted by the washer 32 and the nut 33, the shaft member 22A may be an anchor bolt having a male screw portion at its base end so as to correspond to the female screw portion formed on the nut 33 . Further, the washer 32 may have a size enough to cover the opening of the insertion hole 28.
The separation preventing portion 34 located closer to the base than the steel material 23 is provided at the base end of the shaft member 22 (22B) different from the shaft member 22A inserted into the insertion hole 28B which is a part of the insertion hole 28. [ The release preventing portion 34 is composed of a pair of washers 32 and a nut 33, for example. The shaft member 22B may be an anchor bolt having a male threaded portion at its base end so as to correspond to the female threaded portion formed on the nut 33. In the case where the separation preventing portion 34 is composed of the washer 32 and the nut 33,
It is preferable that the number of the shaft members 22B on which the departure preventing portions 34 are mounted is larger than the number of the shaft members 22A on which the holding portions 31 are mounted. For example, when a rectangular frame-shaped frame body is formed at a position along the column body 12 and the girder body 13 of the existing building 11 by joining a plurality of steel materials 23 , And the gripping portion (31) is disposed only on the angled portion of the frame body. As another example, in addition to the angled portions of the frame body, the holding portions 31 are provided in a part of the plurality of shaft members 22 arranged in the longitudinal direction of the column body 12 or the girder body 13. When such a steel material 23 constitutes a frame body, for example, the shaft member 22 is formed by appropriately positioning on the construction such as providing the holding portions 31 on 58 shaft members 22A out of 162 shaft members 22, It is preferable to form the shaft member 22A fitted with the holding portions 31 at a ratio of about 10 to 40% of the whole.
The washer 32 and the nut 33 are not installed in a part of the shaft member 22 which is inserted / penetrated into the insertion hole 28. The shaft member 22 that is not connected to the steel member 23 by the washer 32 and the nut 33 is referred to as a shaft member 22C and the insertion hole 28 into which the shaft member 22C is inserted is inserted 28C). The shaft member 22C is not required to have a threaded portion, but it is preferable that the shaft members 22A and 22B have the same configuration as the shaft members 22A and 22B in order to make the parts common to the shaft members 22A and 22B.
As described above, the three or more shaft members 22 inserted into the insertion through hole 28 include the first shaft member 22A in which the gripping portion 31 for holding the steel material 23 is provided at the base end portion, A second shaft member 22B provided with a departure prevention portion 34 positioned closer to the base end than the first shaft member 23 and a third shaft member 22C not provided with the separation preventing portion 34 and the holding portion 31.
When the steel material 23 is a steel plate, it is preferable to dispose a plurality of band bars 27 connected to the outer periphery of the steel plate by the connecting member 26. In this case, the proximal end portion of the shaft member 22 to which the washer 32 and the nut 33 are mounted is disposed at a position where it can be wrapped around the belt reinforcing bar 27.
Next, an earthquake-proofing method of the existing building 11 will be described.
In forming the reinforcing portion 21, three or more insertion holes 15 are formed in the column 12 and the girder body 13 of the existing building 11 first. Three or more insertion holes 28A, 28B and 28C must be formed at predetermined positions in the steel material 23 and the reinforcing bars 27 are attached to the steel material 23 through the connecting member 26 I will.
4, the leading end of the shaft member 22 is connected to the insertion hole 15 so that the base end of the shaft member 22 is projected from the column body 12 and the girder body 13 so that the shaft member 22 ) (Installation of the shaft material). A pair of washers 32 and a nut 33 are mounted on the shaft member 22A which is a part of the shaft member 22.
Subsequently, the proximal ends of the plurality of shaft members 22 (22A, 22B, 22C) are inserted into the plurality of insertion holes 28 (28A, 28B, 28C) provided on the steel material 23 with the steel material 23 suspended by a crane or the like, (Insertion process).
Another pair of washers 32 and nuts 33 are provided in the festival 22A to tighten the pair of nuts 33 with the steel material 23 interposed therebetween so as to insert / The shaft member 22A and the steel member 23 are connected by sandwiching the steel member 23 by the sandwiching portion 31 provided at the base end portion of the shaft member 22A. At this time, the steel material 23 is held by the washer 32 and the nut 33 constituting the holding portion 31 so as to be disposed at a position spaced apart from the column body 12 and the girder body 13, Respectively.
A pair of washers 32 and a nut 33 are provided on the base end side of the steel material 23 in the shaft member 22B. That is, at the base end portion of the shaft member 22B inserted / penetrated into the insertion hole 28, the separation preventing portion 34 is provided closer to the base end than the steel material 23 (the separation preventing process). This prevents the steel material 23 from coming off so as not to be separated from the shaft member 22B by the washer 32 and the nut 33 constituting the departure prevention portion 34. [
The washer 32 and the nut 33 are not mounted on the shaft member 22C. When a plurality of steel materials 23 are provided on the shaft member 22, the respective steel members 23 are connected to the shaft member 22 by the washer 32 and the nut 33 in the same manner, .
When the installation of all the steel materials 23 is completed, as shown in Fig. 5, a mold for placing concrete on the outer surface side of the column body 12 (or the girder body 13) as if it surrounds the steel material 23 and the belt reinforcing bar 27 The shaft member 22C in which the separation preventing portions 34 and the holding portions 31 are not provided is left in some of the three or more shaft members 22 as indicated by the chain line in Fig. Concrete is poured into the formwork 16 to pour the concrete so as to surround the periphery of the steel material 23 at a position in contact with the existing building 11 (casting step).
At this time, the tip of the concrete hitting 17 is disposed between the outer surface of the existing building 11 and the steel material 23, and the concrete is supplied into the formwork 16, so that the washer 32 of the insertion holes 28B, The concrete flows into the inlet of the side where the nut 33 is not provided, so that the concrete is also filled in the insertion hole 28. 3, concrete is inserted between the insertion hole 28B and the shaft member 22B through the opened opening on the side of the existing building of the insertion hole 28B with respect to the insertion hole 28B in which the shaft member 22B is inserted Is charged. The insertion hole 28C in which the shaft member 22C without the holding portion 31 is inserted is inserted between the insertion hole 28C and the shaft member 22C through the two openings of the insertion hole 28C The concrete is filled. Concrete is not charged between the insertion hole 28A and the shaft member 22A with respect to the insertion hole 28A in which the shaft member 22A on which the holding portion 31 is mounted is inserted. It is preferable that the diameter of the insertion hole 28 is set such that a clearance is formed between the insertion hole 28 and the shaft member 22 inserted / penetrated into the insertion hole 28 to fill the concrete.
After the concrete is solidified to form the concrete body 24, the mold 16 is removed. The shaft members 22B and 22C are connected to the steel material 23 through the concrete body 24 filled in the insertion holes 28B and 28C. Thereafter, the surface treatment of the concrete body 24, such as spraying of the exterior material, is carried out as necessary to complete the reinforcing portion 21.
Next, the operation of the seismic-reinforcement structure of the existing building 11 and the seismic-reinforcement method of the existing building in the present embodiment will be described.
When the diameter of the insertion through hole 28 is D1 and the diameter of the shaft 22 is D2, the insertion hole 28 is formed to be large, for example, D1-D2? 20 mm. The shaft member 22 can be easily inserted into the through hole 28. [
Particularly, when the reinforcing portion 21 is installed in the existing building 11, the position of the insertion hole 28 arranged on the basis of the design diagram and the position of the shaft member 22 installed at the site often deviate from each other. In the case where the number of the insertion through holes 28 is three or more in the longitudinal direction, the positions in the direction intersecting the longitudinal direction are shifted, and when the number of the insertion through holes 28 is four or more It is difficult to adjust the error of each position of the insertion hole 28 at an interval of about 2 mm.
In this regard, when the insertion hole 28 for inserting the shaft member 22 is formed in the steel material 23, the insertion hole 28 is formed to have a diameter larger than the diameter of the shaft member 22, The shaft member 22 can be inserted and passed through the plurality of insertion holes 28 even when the shaft member 22 is shifted or inserted in a state in which the shaft member 22 is tilted with respect to the wall surface.
However, when the insertion through hole 28 is formed to be larger than the diameter of the shaft member 22, when the concrete is pinched by the washer 32 and the nut 33, There is a possibility that the integrity of the steel material 23 and the concrete body 24 is deteriorated.
That is, when the existing building 11 and the reinforcement 21 vibrate in the direction crossing the axial direction of the festival 22 due to an earthquake or the like, if there is a cavity in the insertion hole 28, There is a possibility that sufficient force can not be transmitted between the shaft member 22 and the steel material 23. [ The direction intersecting the axial direction includes not only a direction orthogonal to the axial direction, but also a direction crossing obliquely to the axial direction.
In this regard, at least one of the openings of the insertion through holes 28B and 28C is opened so that the insertion holes 28B and 28C are filled with the shafts 22B and 22C through the concrete body 24 filled with concrete, The steel material 23 is integrated. That is, since the force acting in the direction intersecting the axial direction with respect to the shaft members 22B and 22C can be transmitted to the steel material 23 through the concrete body 24 filled in the insertion through holes 28B and 28C, 21) can sufficiently be exerted.
When the number of the insertion holes 28B and 28C for inserting / passing the shaft members 22B and 22C is greater than the number of the insertion holes 28A for inserting / passing the shaft member 22A, The integral of the steel material 23 and the concrete body 24 can be increased.
On the other hand, when the existing building 11 vibrates in the axial direction of the shaft member 22 due to an earthquake or the like, the displacement of the existing building 11 is transmitted to the steel member 23 through the shaft member 22. At this time, even if the shaft member 22A is inserted so as to allow the shaft member 22A to flow freely in the insertion hole 28A, even if the cavity remains in the insertion hole 28A after the concrete is poured, The force can be transmitted to the steel material (23) through the holding portion (31).
The steel material 23 is caught by the separation preventing portion 34 when a force acts on the shaft member 22B along the axial direction in the direction away from the steel material 23 and the steel material 23 Can follow the displacement of the existing building 11 and can exert an earthquake-proof action by the reinforcing portion 21. [
As described above, the seismic action of the shaft 22B and the shaft 22C is equivalent to the action of the force acting in the direction crossing the axial direction. However, the shaft 22B is made of the seismic resistance Action is high. Therefore, if the shaft member 22B is not provided or the number of the shaft member 22B is reduced, a shaft member 22A for replacing the shaft member 22B may be arranged to compensate the axial seismic action.
Since the shaft member 22A needs to be positioned so as to correspond to the shaft member 22 before the concrete is poured, at least the end portion in the longitudinal direction of the steel member 23 and the joint between the steel members 23 It is necessary to install the sensor in a place where it becomes an element of positioning.
Since the one through-hole 28B is blocked by one of the washer 32 and the nut 33 serving to prevent the escape of the steel material 23, the inlet hole 28B is located at the entrance side (the side of the existing building 11) When the concrete is introduced, it is easy to insert the concrete into the insertion hole 28B. When the concrete flows into the side of the existing building 11 from the side of the steel material 23, the steel material 23 is pushed toward the base end side of the shaft material 22 by the flowing concrete, The movement of the steel member 23 to the base end side is suppressed by the nut 33 installed. Therefore, even when the holding portions 31 are not provided in only a part of the shafts 22, the occurrence of the situation in which the steel material 23 moves to the base end side and is separated from the shafts 22 is suppressed.
In addition, in the shaft members 22B and 22C, the installation number of the washer 32 and the nut 33 is smaller than that of the shaft member 22A, so that the work of installing the washer 32 and the nut 33 is reduced. Since the base end portion of the shaft member 22 on which the washer 32 and the nut 33 are mounted is located at the position surrounded by the belt reinforcing bar 27, So that the working time can be shortened.
The number of the shaft members 22C that do not include the holding portions 31 and the departure preventing portions 34 is set to be greater than the number of the shaft members 22A having the holding portions 31 and the shaft member 22B or the number of the shaft members 22C is greater than the sum of the shaft members 22A and the shaft members 22B, the working time can be further shortened.
According to the above-described embodiment, the following effects can be obtained.
(1) The steel material 23 is sandwiched by the sandwiching portion 31 provided on a part of the shaft member 22A so that the position of the steel material 23 is appropriately positioned and the other steel material 22B is located closer to the base end than the steel material 23 The movement of the steel material 23 toward the base end side can be suppressed by the separation preventing portion 34 provided. The concrete does not flow into the insertion hole 28A of the steel material 23 held by the holding portion 31 while the concrete enters the insertion hole 28B of the shaft member 22 provided with the separation preventing portion 34 . Therefore, even when the insertion hole 28 is enlarged, lowering of the integrity of the shaft 22 and the steel material 23 with the concrete body 24 can be suppressed more than the case of providing the holding portions 31 to all the shaft members 22 have. Therefore, by forming the insertion hole 28 as large as possible so that the proximal end portion of the festival 22 can be engaged with the fuselage 22, the workability when the steel material 23 is installed on the various shaft members 22 inserted into the existing building 11 is securely secured The lowering of the integrity of the shaft member 22 and the steel material 23 with the concrete body 24 can be suppressed.
(2) By increasing the number of the shaft member 22B on which the separation preventing portion 34 is provided to be larger than the number of shaft members 22A on which the holding portions 31 are mounted, the number of the insertion holes 28 into which the concrete flows is increased It is possible to enhance the integrity of the shaft member 22 and the steel material 23 with the concrete body 24.
(3) The position of the steel material 23 can be made appropriate by holding the steel material 23 by the holding part 31 provided in a part of the shaft member 22A. The through holes 28B and 28B in which the shafts 22B and 22C not provided with the holding portions 31 are inserted are not inserted into the insertion holes 28A of the steel material 23 held by the holding portions 31, 28C). Therefore, the shaft members 22B, 22C and the steel material 23 can be connected by the concrete body 24 filled in the insertion holes 28B, 28C. The insertion hole 28 is enlarged to such an extent that the base end portion of the shaft member 22 can be engaged with the shaft member 22 so as to secure the workability when the steel member 23 is installed on the various shaft members 22 inserted into the existing building 11, And the lowering of the integrity of the steel material 23 with the concrete body 24 can be suppressed.
(4) A holding portion 31 is provided on a shaft member 22 disposed at a position where the column 12 and the girder body 13 intersect with each other to sandwich the steel material 23 to sandwich the steel material 23 22). ≪ / RTI >
(5) When the steel material 23 is disposed at a position along the column body 12 and the girder body 13 of the existing building 11 to form the frame body, the holding portion 31 is provided at the angled portion of the frame body The steel material 23 can be efficiently positioned with respect to the shaft member 22 before the concrete is placed.
(Change example)
It is also possible to modify the embodiment as follows.
The number and arrangement of the inclined reinforcing members 25 provided in the reinforcing portion 21 can be arbitrarily changed.
For example, the arrangement of the two inclined reinforcing members 25 in the reinforcing portion 21 may be changed as in the first modification shown in Fig. 6 (a) The inclined reinforcing members 25 provided in the reinforcing portion 21 may be disposed in one piece as in the modified example. Alternatively, as shown in the third modified example shown in Fig. 6 (c) The reinforcing member 25 may be disposed.
The steel material 23 embedded in the reinforcement portion 21 is not limited to the steel plate but may be arbitrarily changed, for example, H-shaped steel, I-shaped steel, grooved steel or acid steel.
For example, when the H-shaped steel is used as the steel material 23 as in the fourth modification shown in Fig. 7, a high strength against stress such as tensile bending and compression can be exhibited. When the H-shaped steel is used as the steel material 23, the inclined reinforcing member 25 and the reinforcing bar 27 need not be provided. In this case, fibers such as vinylon fiber and stainless steel fiber may be added to the concrete body 24.
The diameter of the insertion hole 28A for inserting the shaft member 22A may be smaller than the diameter of the insertion holes 28B and 28C for inserting the shaft members 22B and 22C. According to this configuration, the cavity formed in the insertion hole 28 when the concrete is pinched by the holding portion 31 can be reduced.
The diameter D1 of the insertion hole 28 can be arbitrarily changed depending on the grade of the insertion hole 28 and the shaft 22. For example, it is preferable that 10 mm? (D 1 - D 2) is provided because the concrete is easily filled in the insertion hole 28. (D1-D2) ≤ 30 mm because it is possible to cope with the positional error of the insertion hole 28 when the distance D1-D2 is set to about 30 mm. Also, as in the above embodiment, when the spacing between the shafts 22 such as the post-construction anchors provided for the earthquake-proof reinforcement in the existing building 11 is about 5.5 times the shaft diameter of the shafts and the shaft diameter is 20 mm, (22) is about 90 mm. Therefore, in order for the two insertion holes 28, into which the two adjacent shaft members 22 are inserted, not to interfere, it is necessary to set the distance D1 to about 100 mm.
The holding portions 31 or the separation preventing portions 34 may be provided on all the shaft members 22 without providing the shaft member 22C and the insertion hole 28C. In this case, the number of the through-holes 28 and the number of the shaft members 22 can be changed to two or more arbitrary values.
The shaft member 22B and the insertion hole 28B are formed and a part of the shaft member 22A inserted into the insertion hole 28 is connected to the steel member 23 by the holding portion 31 provided at the base end portion, The other shaft member 22C inserted into the through hole 28C is connected to the steel material 23 by the concrete body 24 filled in the insertion hole 28C. In this case, the number of the through-holes 28 and the number of the shaft members 22 can be changed to any value of 2 or more. In addition, in the case of employing this configuration, in the above-described earthquake-proofing method for an existing building, the separation preventing step can be omitted.
According to this configuration, the steel material 23 can be held by the holding portions 31 provided on some of the shaft members 22A, and the position of the steel material 23 can be made appropriate. Concrete does not flow into the insertion hole 28A of the steel material 23 held by the holding portion 31 while the insertion hole 28C into which the shaft member 22C not provided with the holding portion 31 is inserted Respectively. Therefore, the shaft member 22C and the steel material 23 can be connected by the concrete body 24 filled in the insertion hole 28C. The insertion hole 28 is enlarged to such an extent that the base end portion of the shaft member 22 can be engaged with the shaft member 22 so that the workability when the steel member is installed on the various shaft members 22 inserted into the existing building 11 is easily ensured, It is possible to suppress the deterioration of the integrity of the reinforcing member 23 with the concrete body 24.
The reinforcing portion 21 is not limited to the frame body disposed along the pair of pillars 12 and the pair of pillars 13 but may be formed of only the pillars 12 or the pillars 13 Or a cross shape or an L shape so as to have one intersection where the column body 12 and the girder body 13 intersect with each other. Further, the reinforcing portion 21 may have 2 to 3 crossing portions where the columnar body 12 and the girder body 13 intersect. When the reinforcing portion 21 has a long shape, it is preferable to provide the holding portions 31 at least on the shaft member 22 located at both ends of the reinforcing portion 21, In the case where the girder body 13 is disposed along the crossing portion where the girder body 13 intersects with the girder body 13, at least the girder portion 22 disposed at the position where the girder body 12 and the girder body 13 intersect is provided with the gripping portion 31 desirable.
A through hole may be provided in the steel material 23 without the shaft member 22 inserted. According to this structure, the integrity of the steel material 23 with the concrete body 24 can be increased by filling the through hole with concrete.
The cooperation portion 31 and the separation preventing portion 34 can be formed by other than the washer 32 and the nut 33. For example, a dedicated member formed by integrating the washer 32 and the nut 33 may be used. Further, a cap-shaped separation preventing portion may be provided at the base end of the shaft member 22, or the base end of the shaft member 22 may be bent to provide a separation preventing portion.
An object into which the shaft member 22 is to be inserted in the existing building 11 is not limited to the column body 12 and the girder body 13 but may be an arbitrary structure designed to support the structural strength, The reinforcing portion 21 may be provided by inserting the reinforcing portion 22.
The present invention is not limited to the illustrated ones. For example, it should be understood that the illustrated features are not necessarily essential to the present invention, but the subject matter of the present invention may lie in less than all features of the specific embodiments disclosed.
11 ... building, 12 ... column body, 13 ... girder body, 22 ... shaft material, 22A ... first shaft material, 22B ... second shaft material, 22C ... third shaft material , 23 ... steel material, 24 ... concrete body, 28, 28A, 28B, 28C ... insertion hole, 31 ... nipping portion, 34 ... departure prevention portion

Claims (9)

  1. A plurality of shafts into which the leading end is inserted into the existing building,
    A steel material having a plurality of through holes so that the proximal end portions of the plurality of shaft materials can be opened;
    A nip portion provided at the proximal end portion of any of the shaft members inserted through the insertion hole and for holding the steel material,
    A release preventing portion provided at a position closer to the base end than the steel material at the base end portion of the other shaft member inserted through the insertion hole,
    A concrete body including the steel material therein and integrated with the existing building,
    (1).
  2. [2] The building of claim 1, wherein at least three of the shaft members are inserted and the steel material has at least three insertion holes,
    Wherein the number of the shaft members on which the release preventing portion is formed is larger than the number of the shaft members on which the sandwiching portion is mounted.
  3. A plurality of shafts into which the leading end is inserted into the existing building,
    A steel material having a plurality of through holes so as to allow the proximal end of the shaft material to flow,
    A concrete body including the steel material therein and integrated with the existing building,
    Lt; / RTI >
    Wherein the shaft member inserted or pierced through the insertion hole is connected to the steel member by a holding portion provided at the base end portion and the other shaft member inserted into the insertion hole is passed through the concrete body filled in the insertion hole, Wherein the reinforcing member is connected to the steel member.
  4. Three or more shafts in which a leading end portion is fitted in the existing building,
    A steel material having three or more insertion holes through which the proximal end of the shaft member can flow,
    A concrete body including the steel material therein and integrated with the existing building,
    Lt; / RTI >
    Wherein the three or more shafts inserted into and passed through the insertion hole have a first shaft member on which the holding portion for holding the steel material is provided on the base end portion and a second shaft member on which a separation preventing portion positioned closer to the base end than the steel material is formed, And a third shaft member on which the separation preventing portion and the sandwiching portion are not provided
    Seismic strengthening structure of existing buildings.
  5. 5. The method according to any one of claims 1 to 4,
    The shaft member has a leading end portion fitted to the column body and the girder body of the existing building
    Wherein the sandwiching section is provided on the shaft member disposed at a position where the column and the girder body intersect.
  6. 6. The method according to any one of claims 1 to 5,
    Wherein the steel material is disposed at a position along the column and the girder body of the existing building to constitute a frame body, and the nip portion is disposed at least at an angled portion of the frame body.
  7. A shaft member mounting step of connecting the front ends of the plurality of shaft members to the existing building,
    A step of inserting and inserting proximal ends of the plurality of shaft members into a plurality of insertion holes formed in a steel material,
    A sandwiching step of sandwiching the steel material by a sandwiching part provided at a proximal end of a shaft member inserted /
    A release preventing step of providing a release preventing portion closer to the base end than the steel material at the base end portion of the other shaft member inserted /
    A pouring step of pouring concrete so as to surround the periphery of the steel material at a position in contact with the existing building,
    And an earthquake-proof reinforcing method of the existing building.
  8. A shaft member mounting step of connecting the front ends of the plurality of shaft members to the existing building,
    A step of inserting and inserting proximal ends of the plurality of shaft members into a plurality of insertion holes formed in a steel material,
    A sandwiching step of sandwiching the steel material by a sandwiching part provided at a proximal end of a shaft member inserted /
    A placing step of placing concrete in a position in contact with the existing building so as to surround the periphery of the steel material so as to fill the inserted through hole into which the other shaft material is inserted,
    An earthquake-proof reinforcement method of an existing building
  9. A shaft material installation step of connecting three or more shaft ends of the shaft member to the existing building,
    A step of inserting and inserting proximal ends of the three or more shaft members into three or more insertion holes formed in a steel material,
    A sandwiching step of sandwiching the steel material by a sandwiching portion provided at a base end portion of any one of the shaft members inserted /
    A separation preventive step of disposing a departure prevention part closer to the base end than the steel material at a base end part of the shaft member different from the shaft member provided with the holding part;
    The concrete is placed in a position in contact with the existing building so as to surround the periphery of the steel material in a state in which a part of the three or more shafts is left without the departure prevention portion and the nipping portion, A pouring step of filling concrete into the through hole,
    And an earthquake-proof reinforcing method of the existing building.
KR1020157022838A 2014-09-05 2015-06-11 Seismic strengthening structure and method for existing building KR101634512B1 (en)

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JPJP-P-2014-181482 2014-09-05
JP2014181482A JP5694596B1 (en) 2014-09-05 2014-09-05 Seismic reinforcement structure for existing buildings and seismic reinforcement method for existing buildings
PCT/JP2015/066904 WO2016035411A1 (en) 2014-09-05 2015-06-11 Seismic reinforcing structure for existing buildings and seismic reinforcing method for existing buildings

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10152997A (en) 1996-11-25 1998-06-09 Yahagi Kensetsu Kogyo Kk Earthquake-resistant reinforcing construction method of existing building
JP2000345719A (en) * 1999-06-07 2000-12-12 Yahagi Construction Co Ltd Reinforcing method of through opening in existing bearing wall
JP2006312859A (en) * 2005-04-06 2006-11-16 Toyohashi Univ Of Technology Aseismatic reinforcing structure and aseismatic reinforcing method for existing building
JP2011168955A (en) * 2010-02-16 2011-09-01 Kunimoto Co Ltd Reinforcing concrete form structure

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10152997A (en) 1996-11-25 1998-06-09 Yahagi Kensetsu Kogyo Kk Earthquake-resistant reinforcing construction method of existing building
JP2000345719A (en) * 1999-06-07 2000-12-12 Yahagi Construction Co Ltd Reinforcing method of through opening in existing bearing wall
JP2006312859A (en) * 2005-04-06 2006-11-16 Toyohashi Univ Of Technology Aseismatic reinforcing structure and aseismatic reinforcing method for existing building
JP2011168955A (en) * 2010-02-16 2011-09-01 Kunimoto Co Ltd Reinforcing concrete form structure

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JP5694596B1 (en) 2015-04-01
WO2016035411A1 (en) 2016-03-10
JP2016056524A (en) 2016-04-21

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