JP4809074B2 - Seismic reinforcement structure and method for steel column exposed column base - Google Patents

Seismic reinforcement structure and method for steel column exposed column base Download PDF

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JP4809074B2
JP4809074B2 JP2006048580A JP2006048580A JP4809074B2 JP 4809074 B2 JP4809074 B2 JP 4809074B2 JP 2006048580 A JP2006048580 A JP 2006048580A JP 2006048580 A JP2006048580 A JP 2006048580A JP 4809074 B2 JP4809074 B2 JP 4809074B2
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anchor bolt
column base
reinforcing core
fixed
exposed column
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松尾彰
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松尾 彰
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Description

本発明は鋼構造露出柱脚の耐震補強構造および補強工法に関する。   The present invention relates to a seismic reinforcing structure and a reinforcing method for a steel structure exposed column base.

従来、建築構造物を、アンカーボルトにより基礎コンクリートに定着し、支持する工法として露出柱脚が用いられている。
平成７年兵庫県南部地震の経験により現在は、大地震の際にはアンカーボルトの塑性変形によって地震エネルギーを吸収し、建築構造物の倒壊を防ぐように配慮した耐震設計が行われている。
近年は、アンカーボルトの素材として、降伏比を７０％以下に抑えたＪＩＳＧ３１３８ＳＮＲ材をベースとした転造ネジまたは切削ネジアンカーボルトが使用されている。 Conventionally, exposed column bases are used as a method of fixing and supporting a building structure on foundation concrete with anchor bolts.
Based on the experience of the 1995 Hyogo-ken Nanbu Earthquake, seismic design is currently under consideration to prevent collapse of building structures by absorbing seismic energy by plastic deformation of anchor bolts in the event of a large earthquake.
In recent years, a rolled screw or a cutting screw anchor bolt based on a JISG3138 SNR material whose yield ratio is suppressed to 70% or less is used as a material of the anchor bolt.

しかし、旧来のアンカーボルトには、丸鋼ＳＮＲ材のようなものはなく、丸鋼（ＳＲ材やＳＳ材）等にナットで固定するためのネジ部を切削したものであり、大規模な地震の際に、軸部が十分に塑性変形を行う前に、ネジ部で早期に破断してしまい、建築構造物が倒壊してしまう可能性がある。
現在、この種のアンカーボルトを有する建築構造物が数多く現存しており、何らかの対策を施すことにより、その塑性変形能力を改善することが急務であると考えられている。 However, there is no such thing as a round steel SNR material in the conventional anchor bolts, but it is a large-scale earthquake that cuts the screw part for fixing to round steel (SR material or SS material) with a nut. In this case, before the shaft portion is sufficiently plastically deformed, the screw portion may be broken at an early stage, and the building structure may be collapsed.
At present, there are many building structures having this type of anchor bolt, and it is considered urgent to improve the plastic deformation ability by taking some measures.

本発明は、施工性、経済性に優れた、鋼構造露出柱脚の耐震補強構造および補強工法を提供することを目的とする。   An object of this invention is to provide the seismic reinforcement structure and reinforcement method of a steel structure exposed column base excellent in workability and economical efficiency.

上記目的を達成するためになされた本願の第１発明は、基礎コンクリートにアンカーボルトを埋設して定着し、基礎コンクリートから露出した前記アンカーボルトの端部にネジ部を設け、締付ナットにより、前記アンカーボルトの端部を建築構造物のベースプレートに固定した、鋼構造露出柱脚の補強構造であって、前記アンカーボルトの、少なくとも前記ネジ部の軸心に、補強芯材を配置し、該補強芯材と、前記アンカーボルトとを固着したことを特徴とする、鋼構造露出柱脚の補強構造を提供するものである。
本願の第２発明は、前記した第１発明において、前記補強芯材が、高張力鋼製または炭素繊維などの高強度新素材を用いた複合材製であることを特徴とする、鋼構造露出柱脚の補強構造を提供するものである。
本願の第３発明は、前記した第１発明または第２発明において、前記補強芯材と前記アンカーボルトとを固着する定着部の下端が、前記アンカーボルトのネジ部の下端よりも下方に位置することを特徴とする、鋼構造露出柱脚の補強構造を提供するものである。
本願の第４発明は、基礎コンクリートにアンカーボルトを埋設して定着し、基礎コンクリートから露出した前記アンカーボルトの端部にネジ部を設け、締付ナットにより、前記アンカーボルトの端部を建築構造物のベースプレートに固定した、鋼構造露出柱脚の補強工法であって、前記アンカーボルトの、少なくとも前記ネジ部の軸心に、孔部を設け、該孔部に補強芯材を挿入し、該補強芯材と、前記アンカーボルトとを固着することを特徴とする、鋼構造露出柱脚の補強工法を提供するものである。
本願の第５発明は、前記した第４発明において、前記補強芯材と前記アンカーボルトとを、螺着、接着、又は溶接により固着したことを特徴とする、鋼構造露出柱脚の補強工法を提供するものである。
1st invention of this application made in order to achieve the said objective, the anchor bolt was embed | buried and fixed to foundation concrete, the thread part was provided in the edge part of the said anchor bolt exposed from foundation concrete, A steel structure exposed column base reinforcing structure in which an end portion of the anchor bolt is fixed to a base plate of a building structure, wherein a reinforcing core material is disposed at least on an axis of the screw portion of the anchor bolt, A reinforcing structure for a steel structure exposed column base is provided, wherein a reinforcing core member and the anchor bolt are fixed.
The second invention of the present application is the steel structure exposure according to the first invention, wherein the reinforcing core material is made of high-strength steel or a composite material using a new high-strength material such as carbon fiber. The reinforcement structure of a column base is provided.
According to a third invention of the present application, in the first invention or the second invention described above, the lower end of the fixing portion that fixes the reinforcing core member and the anchor bolt is positioned below the lower end of the screw portion of the anchor bolt. A reinforcing structure for a steel structure exposed column base is provided.
According to a fourth aspect of the present invention, an anchor bolt is embedded and fixed in foundation concrete, a screw portion is provided at an end portion of the anchor bolt exposed from the foundation concrete, and the end portion of the anchor bolt is constructed by a tightening nut. A steel structure exposed column base reinforcement method fixed to a base plate of an object, wherein a hole is provided at least in the axial center of the threaded portion of the anchor bolt , and a reinforcing core material is inserted into the hole, The present invention provides a method for reinforcing a steel structure exposed column base, characterized by adhering a reinforcing core material and the anchor bolt.
According to a fifth aspect of the present invention, there is provided a method for reinforcing a steel structure exposed column base according to the fourth aspect described above, wherein the reinforcing core member and the anchor bolt are fixed by screwing, bonding, or welding. It is to provide.

本発明は、上記した課題を解決するための手段により、次のような効果の少なくとも一つを得ることができる。
＜１＞既存のアンカーボルトを補強し、アンカーボルトネジ部の早期破断による建築構造物の倒壊を防ぐことができる。
＜２＞既存アンカーボルトに孔部を設けるだけなので、容易に施工することができる。
＜３＞既存のアンカーボルトはそのまま使用できるため、補強工事費が安価で済む。 The present invention can obtain at least one of the following effects by means for solving the above-described problems.
<1> The existing anchor bolt can be reinforced to prevent the building structure from collapsing due to the early breakage of the anchor bolt screw portion.
<2> Since the hole is only provided in the existing anchor bolt, it can be easily constructed.
<3> Since existing anchor bolts can be used as they are, the cost of reinforcement work can be reduced.

以下、図面を参照しながら本発明の実施の形態について説明する。   Hereinafter, embodiments of the present invention will be described with reference to the drawings.

＜１＞アンカーボルトの耐震補強構造
本発明は、図１及び図２に示すように、既存アンカーボルト１０の頭部１１に設けられた孔部２１と、孔部２１に挿入して固着する補強芯材２０とにより構成する。 <1> Seismic Reinforcement Structure of Anchor Bolt As shown in FIGS. 1 and 2, the present invention provides a hole 21 provided in the head 11 of the existing anchor bolt 10 and a reinforcement that is inserted into and fixed to the hole 21. The core material 20 is used.

＜２＞既存アンカーボルト
既存アンカーボルト１０は、建築構造物３０の下部に配置される露出柱脚のベースプレート４０を基礎コンクリート５０に固定しているものである。基礎コンクリート５０に埋設して定着した既存アンカーボルト１０の露出部に設けたネジ部１０１をベースプレート４０に挿通し、締付ナット１２により建築構造物３０の下部に設けたベースプレート４０を基礎コンクリート５０上に固定することにより、建築構造物３０を所定の位置に固定している。
既存アンカーボルト１０のネジ部１０１は、軸部１０２よりも細くなっている。
既存アンカーボルト１０は、締付ナット１２で締めつけることで、ベースプレート４０を固定している。 <2> Existing Anchor Bolt The existing anchor bolt 10 fixes the base plate 40 of the exposed column base arranged at the lower part of the building structure 30 to the foundation concrete 50. The threaded portion 101 provided in the exposed portion of the existing anchor bolt 10 embedded and fixed in the foundation concrete 50 is inserted into the base plate 40, and the base plate 40 provided in the lower part of the building structure 30 by the tightening nut 12 is placed on the foundation concrete 50. By fixing the building structure 30, the building structure 30 is fixed at a predetermined position.
The threaded portion 101 of the existing anchor bolt 10 is thinner than the shaft portion 102.
The existing anchor bolt 10 is fastened with the fastening nut 12 to fix the base plate 40.

＜３＞補強芯材
補強芯材２０は、既存アンカーボルト１０の頭部１１に、既存アンカーボルト１０の軸心に設けた孔部２１に挿入して固着することで、既存アンカーボルトネジ部１０１を補強するものである。
補強芯材２０は高張力鋼や炭素繊維などの高強度新素材を用いた複合材等の材料からなる。
補強芯材２０と既存アンカーボルト１０は、螺着により結合して固着する。
<3> reinforcing core material reinforcing core member 20, the head 11 of the existing anchor bolt 10, by fixing is inserted into the hole portion 21 digits set the axis of the existing anchor bolt 10, the existing anchor bolt threaded portion 101 It is something to reinforce.
The reinforcing core member 20 is made of a material such as a composite material using a new high-strength material such as high-tensile steel or carbon fiber.
The reinforcing core member 20 and the existing anchor bolt 10 are joined and fixed together by screwing.

＜４＞耐震補強構造の構築
次に、補強芯材２０を用いた鋼構造露出柱脚の耐震補強方法について説明する。 <4> Construction of Seismic Reinforcement Structure Next, a method for seismic reinforcement of a steel structure exposed column base using the reinforcing core member 20 will be described.

図２に示すように、既存アンカーボルト１０の頭部１１に、既存アンカーボルトの軸心に、ドリルにより孔部２１を設ける。孔部２１の径や深さは、既存アンカーボルト径や、既存アンカーボルトネジ部１０１の長さ等により、適宜決定する。
補強芯材２０を既存アンカーボルト１０に螺着する場合には、孔部２１の内側面をネジ状にする。
As shown in FIG. 2, the hole 21 is provided in the head 11 of the existing anchor bolt 10 by a drill in the axis center of the existing anchor bolt. The diameter and depth of the hole 21 are appropriately determined according to the existing anchor bolt diameter, the length of the existing anchor bolt screw portion 101, and the like.
When the reinforcing core member 20 is screwed to the existing anchor bolt 10, the inner surface of the hole 21 is formed into a screw shape.

次に、孔部２１に補強芯材２０を挿入し、既存アンカーボルト１０と一体になるように螺着し、定着部１０３を形成して固着する。
補強芯材２０と既存アンカーボルト１０を螺着することにより、既存アンカーボルトネジ部１０１の引張力の一部を、補強芯材２０の頭部２０１から、補強芯材２０の軸部、補強芯材２０と既存アンカーボルト１０との定着部１０３を通して既存アンカーボルトの軸部１０２に伝えることができる。
補強芯材２０は、定着部１０３の下端が、アンカーボルトネジ部１０１の下端よりも下方に位置するように配置する。 Next, the reinforcing core member 20 is inserted into the hole portion 21 and screwed so as to be integrated with the existing anchor bolt 10 to form and fix the fixing portion 103.
By screwing the reinforcing core member 20 and the existing anchor bolt 10 together, a part of the tensile force of the existing anchor bolt screw portion 101 is transferred from the head 201 of the reinforcing core member 20 to the shaft portion of the reinforcing core member 20 and the reinforcing core member. 20 and the anchor portion 103 of the existing anchor bolt 10 can be transmitted to the shaft portion 102 of the existing anchor bolt.
The reinforcing core member 20 is disposed so that the lower end of the fixing portion 103 is positioned below the lower end of the anchor bolt screw portion 101.

［作用］
図３に示すように、地震等により、建築構造物３０に曲げモーメントＭが作用すると、既存アンカーボルト１０に引張力Ｔが作用する。
その際に、固着した補強芯材２０により、既存アンカーボルトネジ部１０１を補強する。これにより、既存アンカーボルト軸部１０２で引張降伏するより先に、軸部１０２よりも細い既存アンカーボルトネジ部１０１が破断することを防止する。 [Action]
As shown in FIG. 3, when a bending moment M acts on the building structure 30 due to an earthquake or the like, a tensile force T acts on the existing anchor bolt 10.
At that time, the existing anchor bolt screw portion 101 is reinforced by the fixed reinforcing core member 20. This prevents the existing anchor bolt screw portion 101 thinner than the shaft portion 102 from being broken before the existing anchor bolt shaft portion 102 pulls and yields.

上記のように実施した場合、補強芯材２０の寸法は、以下の３つの関係要素により求められる。   When implemented as described above, the dimension of the reinforcing core member 20 is determined by the following three relational elements.

（ｉ）補強芯材先端孔部と既存アンカーボルト軸部の関係
補強芯材２０の先端孔部２１１が、既存アンカーボルト軸部１０２降伏前に破断しないために、先端孔部２１１断面積を控除した既存アンカーボルト軸部１０２の最大耐力が、既存アンカーボルト軸部１０２の降伏耐力以上となるように設定する。その関係は次に示す通りである。
孔部２１１の断面積を控除した既存アンカーボルト軸部１０２最大耐力≧既存アンカーボルト軸部１０２の降伏耐力 (I) Relationship between the reinforcing core member tip hole and the existing anchor bolt shaft portion The tip hole portion 211 cross-sectional area is subtracted so that the tip hole portion 211 of the reinforcing core member 20 does not break before yielding the existing anchor bolt shaft portion 102. The maximum proof stress of the existing anchor bolt shaft portion 102 is set to be equal to or greater than the yield strength of the existing anchor bolt shaft portion 102. The relationship is as follows.
Maximum yield strength of existing anchor bolt shaft portion 102 excluding the cross-sectional area of hole 211 ≧ yield strength of existing anchor bolt shaft portion 102

（ｉｉ）既存アンカーボルトネジ部と既存アンカーボルト軸部の関係
補強芯材２０により補強した既存アンカーボルトネジ部１０１が、既存アンカーボルト軸部１０２降伏前に破断しないために、既存アンカーボルトネジ部１０１と補強芯材２０との断面の最大耐力の合計が、既存アンカーボルト軸部１０２の降伏耐力以上となるように設定する。その関係は次に示す通りである。
既存アンカーボルトネジ部１０１断面の最大耐力＋補強芯材２０の最大耐力≧アンカーボルト軸部１０２の降伏耐力 (Ii) Relationship between the existing anchor bolt screw portion and the existing anchor bolt shaft portion The existing anchor bolt screw portion 101 reinforced by the reinforcing core member 20 is not ruptured before the existing anchor bolt shaft portion 102 yields. The total maximum yield strength of the cross section with the core material 20 is set to be equal to or greater than the yield strength of the existing anchor bolt shaft portion 102. The relationship is as follows.
Maximum strength of cross section of existing anchor bolt screw portion 101 + maximum strength of reinforcing core 20 ≧ yield strength of anchor bolt shaft portion 102

（ｉｉｉ）補強芯材と補強芯材定着部の関係
補強芯材２０が破断する前に、孔部２１から抜脱しないために、補強芯材定着部１０３のせん断耐力が、補強芯材２０の最大引張耐力以上となるように設定する。その関係は次に示す通りである。
アンカーボルト軸部への定着部１０３のせん断耐力≧補強芯材の最大引張耐力 (Iii) Relationship between Reinforcement Core Material and Reinforcement Core Material Fixing Section In order not to pull out from the hole 21 before the reinforcement core material 20 breaks, the shear strength of the reinforcement core material fixing portion 103 is Set so that it exceeds the maximum tensile strength. The relationship is as follows.
Shear strength of anchoring portion 103 to anchor bolt shaft ≧ maximum tensile strength of reinforcing core

上記関係のうち、（ｉ）および（ｉｉ）により、補強芯材２０の径を決定し、（ｉｉｉ）より定着部１０３の長さを決定する。   Of the above relationships, the diameter of the reinforcing core member 20 is determined by (i) and (ii), and the length of the fixing portion 103 is determined by (iii).

［その他実施例］
補強芯材２０と既存アンカーボルト１０は、螺着ではなく、接着、溶接等により結合して固着することもできる。接着や溶接により結合する場合には、補強芯材２０や孔部２１をネジ状とする必要はないが、接着や溶接の結合強度に合わせて、補強芯材２０の長さを長くし、既存アンカーボルト軸部１０２への定着部１０３の長さを確保する必要がある。
[Other Examples]
The reinforcing core member 20 and the existing anchor bolt 10 can be bonded and fixed by bonding, welding or the like instead of screwing. In the case of bonding by welding or welding, the reinforcing core member 20 and the hole 21 do not need to be threaded, but the length of the reinforcing core member 20 is increased in accordance with the bonding strength of bonding or welding. It is necessary to secure the length of the fixing portion 103 to the anchor bolt shaft portion 102.

本発明のアンカーボルト補強構造の断面図Sectional view of anchor bolt reinforcement structure of the present invention 本発明のアンカーボルト補強構造の斜視図The perspective view of the anchor bolt reinforcement structure of this invention 地震時の力の作用の説明図Illustration of the action of force during an earthquake

符号の説明Explanation of symbols

１０ 既存アンカーボルト
１０１ 既存アンカーボルトネジ部
１０２ 既存アンカーボルト軸部
１０３ 補強芯材定着部
１１ 既存アンカーボルト頭部
１２ 締付ナット
２０ 補強芯材
２０１ 頭部
２１ 孔部
２１１ 補強芯材先端孔部
３０ 建築構造物
４０ ベースプレート
５０ 基礎コンクリート

DESCRIPTION OF SYMBOLS 10 Existing anchor bolt 101 Existing anchor bolt screw part 102 Existing anchor bolt axial part 103 Reinforcement core material fixing | fixed part 11 Existing anchor bolt head 12 Tightening nut 20 Reinforcement core material 201 Head 21 Hole part 211 Reinforcement core material front end hole part 30 Construction Structure 40 Base plate 50 Foundation concrete

Claims (5)

基礎コンクリートにアンカーボルトを埋設して定着し、基礎コンクリートから露出した前記アンカーボルトの端部にネジ部を設け、締付ナットにより、前記アンカーボルトの端部を建築構造物のベースプレートに固定した、鋼構造露出柱脚の補強構造であって、
前記アンカーボルトの、少なくとも前記ネジ部の軸心に、補強芯材を配置し、
該補強芯材と、前記アンカーボルトとを固着したことを特徴とする、
鋼構造露出柱脚の補強構造。 Anchor bolts were embedded and fixed in the foundation concrete, screw portions were provided at the ends of the anchor bolts exposed from the foundation concrete, and the ends of the anchor bolts were fixed to the base plate of the building structure with a tightening nut. Steel structure exposed column base reinforcement structure,
The anchor bolt, the axis of at least the threaded portion, arranged reinforcing core member,
The reinforcing core material and the anchor bolt are fixed to each other,
Steel structure exposed column base reinforcement structure. 請求項１に記載の鋼構造露出柱脚の補強構造において、前記補強芯材が、高張力鋼製または炭素繊維などの高強度新素材を用いた複合材製であることを特徴とする、鋼構造露出柱脚の補強構造。 The steel structure exposed column base reinforcement structure according to claim 1, wherein the reinforcing core member is made of high-strength steel or a composite material using a new high-strength material such as carbon fiber. Structure Exposed column base reinforcement structure. 請求項１または請求項２に記載の鋼構造露出柱脚の補強構造において、前記補強芯材と前記アンカーボルトとを固着する定着部の下端が、前記アンカーボルトのネジ部の下端よりも下方に位置することを特徴とする、鋼構造露出柱脚の補強構造。 The reinforcing structure of the steel structure exposed column base according to claim 1 or 2, wherein a lower end of a fixing portion that fixes the reinforcing core member and the anchor bolt is lower than a lower end of a screw portion of the anchor bolt. A steel structure exposed column base reinforcement structure characterized by being positioned. 基礎コンクリートにアンカーボルトを埋設して定着し、基礎コンクリートから露出した前記アンカーボルトの端部にネジ部を設け、締付ナットにより、前記アンカーボルトの端部を建築構造物のベースプレートに固定した、鋼構造露出柱脚の補強工法であって、
前記アンカーボルトの、少なくとも前記ネジ部の軸心に、孔部を設け、
該孔部に補強芯材を挿入し、
該補強芯材と、前記アンカーボルトとを固着することを特徴とする、
鋼構造露出柱脚の補強工法。 Anchor bolts were embedded and fixed in the foundation concrete, screw portions were provided at the ends of the anchor bolts exposed from the foundation concrete, and the ends of the anchor bolts were fixed to the base plate of the building structure with a tightening nut. A steel structure exposed column base reinforcement method,
The anchor bolt, the axis of at least the threaded portion, is provided a hole,
Insert a reinforcing core into the hole,
The reinforcing core material and the anchor bolt are fixed to each other,
Steel structure exposed column base reinforcement method. 請求項４に記載の鋼構造露出柱脚の補強工法において、前記補強芯材と前記アンカーボルトとを、螺着、接着、又は溶接により固着したことを特徴とする、鋼構造露出柱脚の補強工法。 5. The steel structure exposed column base reinforcement method according to claim 4, wherein the reinforcing core member and the anchor bolt are fixed by screwing, bonding, or welding. Construction method.
JP2006048580A 2006-02-24 2006-02-24 Seismic reinforcement structure and method for steel column exposed column base Expired - Fee Related JP4809074B2 (en)

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JPH02225815A (en) * 1989-02-28 1990-09-07 Toshiba Corp Fastening bolt
JP3695157B2 (en) * 1998-07-10 2005-09-14 日鐵建材工業株式会社 Unbonded anchor bolt with exposed column base

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