JP2720675B2 - How to reinforce legs such as piers - Google Patents
How to reinforce legs such as piersInfo
- Publication number
- JP2720675B2 JP2720675B2 JP3355566A JP35556691A JP2720675B2 JP 2720675 B2 JP2720675 B2 JP 2720675B2 JP 3355566 A JP3355566 A JP 3355566A JP 35556691 A JP35556691 A JP 35556691A JP 2720675 B2 JP2720675 B2 JP 2720675B2
- Authority
- JP
- Japan
- Prior art keywords
- footing
- reinforcing
- pier
- fiber sheet
- existing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Landscapes
- Bridges Or Land Bridges (AREA)
Description
【０００１】[0001]
【産業上の利用分野】この発明はフーチングと一体化さ
れた橋脚等の既設の脚体を補強する方法に関し、より具
体的には脚体に高強度繊維シートを貼付することによっ
て脚体を補強する方法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of reinforcing an existing leg such as a pier integrated with a footing, and more specifically, to reinforcing a leg by attaching a high-strength fiber sheet to the leg. How to do it.
【０００２】[0002]
【従来の技術】従来、既設の煙突とかの塔状構造物或い
は建築物の既設柱を補強するために、これらの外周に高
強度繊維シート及び高強度繊維素材を巻設したものが公
知となっている。この具体的例としては、例えば既設の
煙突の外周に、炭素繊維を縦方向に引き揃えたプリプレ
グからなる繊維シートを縦方向に貼り付け、次いでその
外周に接着剤を含浸した炭素繊維を巻き付けると言うも
のである。この高強度繊維シートを用いた補強方法は、
施工が確実で、靭性・耐荷力が向上し、自重及び断面が
殆ど増加せず、耐久性があると言った多くの利点のため
に益々施工範囲が拡大している。2. Description of the Related Art Hitherto, in order to reinforce an existing chimney or other tower-like structure or an existing pillar of a building, a structure in which a high-strength fiber sheet and a high-strength fiber material are wound around the periphery thereof has been known. ing. As a specific example of this, for example, a fiber sheet made of a prepreg in which carbon fibers are aligned in the longitudinal direction is stuck vertically around the existing chimney, and then the outer periphery is wound with carbon fibers impregnated with an adhesive. That's what it says. The reinforcing method using this high-strength fiber sheet is as follows.
The construction area is expanding due to many advantages such as reliable construction, improved toughness and load-carrying capacity, little increase in own weight and cross section, and durability.
【０００３】最近になって既設の橋脚の耐震強度が見直
され、これらの橋脚を耐震補強する必要性が叫ばれてい
る。上記の種々の利点のため、高強度繊維シートを用い
て橋脚を補強する事が望ましいが、橋脚の外周に上記の
ように高強度繊維シートを貼付したものでは、高強度繊
維シートの下端部が橋脚の下端に構築された既設のフー
チングと一体的かつ強固に接続されないため、橋脚とフ
ーチングとの接続部において高強度繊維シートの十分な
強度を生かすことができず、高強度繊維シートの端部の
固定が大きな技術的課題となっていた。[0003] Recently, the seismic strength of existing piers has been reviewed, and the necessity of reinforcing these piers has been called out. For the above various advantages, it is desirable to reinforce the pier using a high-strength fiber sheet, but in the case where the high-strength fiber sheet is attached to the outer periphery of the pier as described above, the lower end of the high-strength fiber sheet is Because it is not integrally and firmly connected to the existing footing constructed at the lower end of the pier, the strength of the high-strength fiber sheet cannot be utilized at the connection between the pier and the footing, and the end of the high-strength fiber sheet Has been a major technical issue.
【０００４】[0004]
【発明が解決しようとする課題】本発明は上記のような
問題点に鑑みてなされたもので、その目的は既設の橋脚
等の脚体に貼付した高強度繊維シートの下端部を、その
下端のフーチングと一体的かつ強固に接続して上記脚部
を極めて有効に補強することの出来る脚体の補強方法を
提供するにある。SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to remove the lower end of a high-strength fiber sheet affixed to a leg such as an existing bridge pier. Another object of the present invention is to provide a method for reinforcing a leg which can be integrally and firmly connected to the footing of the above and can reinforce the leg very effectively.
【０００５】[0005]
【課題を解決するための手段】上記の目的を達成するた
め、本発明では既設のフーチングと一体化された既設の
橋脚等の脚体を補強するに際し、該脚体の下方部に高強
度繊維シートを該フーチングとの接合部まで貼付し、縦
方向に延長する押えプレートとこのプレートの外面から
横方向に延長するアンカー鉄筋を有する定着具の該押え
プレートを該フーチングとの接合部から該高強度繊維シ
ートを貼付した該脚体の外面に取り付け、該定着具の該
アンカー鉄筋を既設の該フーチングの外側に配筋された
補強用フーチングの鉄筋に添接し、該補強用フーチング
の鉄筋の外周に型枠を設置してからコンクリートを打設
してなるのである。In order to achieve the above object, according to the present invention, when reinforcing a leg such as an existing pier integrated with an existing footing, a high-strength fiber is provided at a lower portion of the leg. The sheet is adhered to the joint with the footing, and the holding plate of the fixing device having a holding plate extending in the longitudinal direction and an anchor reinforcing bar extending in the lateral direction from the outer surface of the plate is moved from the joint with the footing to the height. The anchor fiber of the fixing device is attached to the outer surface of the leg to which the strength fiber sheet is attached, and the anchor reinforcing bar of the fixing device is attached to the reinforcing bar of reinforcing footing arranged outside the existing footing, and the outer periphery of the reinforcing bar of the reinforcing footing is attached. After placing the formwork, concrete is cast.
【０００６】[0006]
【作用】上記のようにコンクリートを打設すると、定着
具の押えプレートの内面は脚体に貼付された高強度繊維
シートの下端部を外方から強固に拘束し、また定着具の
アンカー鉄筋は新設される補強用フーチング内にコンク
リートと一体的に埋設される。When the concrete is cast as described above, the inner surface of the holding plate of the fixing device firmly restrains the lower end portion of the high-strength fiber sheet attached to the leg from the outside, and the anchor reinforcing bar of the fixing device is It will be buried integrally with concrete in the newly installed reinforcing footing.
【０００７】即ち、高強度繊維シートの下端部は補強用
フーチング内に一体的に埋設されて固定された形とな
り、脚体とフーチングとの接続部においても十分な補強
効果が得られる。That is, the lower end of the high-strength fiber sheet is integrally embedded in the reinforcing footing and fixed, and a sufficient reinforcing effect can be obtained also at the connection between the leg and the footing.
【０００８】[0008]
【実施例】以下に本発明の好適な実施例に付いて添付の
図面を参照にして説明する。DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the accompanying drawings.
【０００９】図１において１は既設の平断面矩形の橋脚
を示し、この橋脚１は既設のフーチング２と一体的に構
築されている。この橋脚１を耐震補強するため高強度繊
維シートが橋脚１の下方部外周に貼付されている。この
高強度繊維シートの貼付は先ず炭素繊維束を縦方向に引
き揃えて平行に配設したプリプレグからなる縦揃え高強
度繊維シート３ａを橋脚１の補強を必要とする下方部に
おいて縦方向に貼付し、橋脚１の下端までの全周を覆う
ように貼付する。次いで、炭素繊維束を横方向に引き揃
えて平行に配設したプリプレグからなる横揃え高強度繊
維シート３ｂを上記繊維シート３ａの上から橋脚に巻設
する。この横揃え高強度繊維シート３ｂの巻設はフーチ
ング２の上端から、後述する定着具の押さえプレートの
高さを僅かに越えた距離、例えば４０ｃｍほど離れた地
点で終端をなすようにする。In FIG. 1, reference numeral 1 denotes an existing pier having a rectangular cross section having a flat cross section. The pier 1 is integrally formed with an existing footing 2. A high-strength fiber sheet is affixed to the outer periphery of the lower part of the pier 1 in order to reinforce the pier 1 against earthquakes. This high-strength fiber sheet is first stuck vertically in a lower part where reinforcement of the pier 1 is required by vertically aligning a high-strength fiber sheet 3a composed of prepregs in which carbon fiber bundles are aligned vertically and arranged in parallel. Then, it is attached so as to cover the entire circumference up to the lower end of the pier 1. Next, a horizontally aligned high-strength fiber sheet 3b made of a prepreg in which the carbon fiber bundles are aligned in a horizontal direction and arranged in parallel is wound around the pier from above the fiber sheet 3a. The winding of the horizontally aligned high-strength fiber sheet 3b is terminated at a point slightly away from the upper end of the footing 2 by a height of a holding plate of a fixing tool described later, for example, about 40 cm.
【００１０】次いで、フーチング２の上端、即ち橋脚１
の下端に、図３に示した定着具４を設置する。この定着
具４は押えプレート５とこのプレート５の外面から横方
向に延長するアンカー鉄筋６とからなっている。押えプ
レートの高さは、縦揃え高強度繊維シート３ａの下端部
を外方から押さえる一方、横揃え高強度繊維シート３ｂ
の巻回部にまで至らない高さに形成され、この実施例で
は約３５ｃｍの高さとなっている。また、押えプレート
の上端７は外方に向けて僅かに湾曲形成されているが、
これは高強度繊維シートで補強された橋脚１が地震によ
って変形したときに押えプレート５の上端が垂直な角部
になっていると、その角部で破断される恐れがあるため
である。アンカー鉄筋６は上下に夫々水平な列をなして
設けられ、上部列の鉄筋６はほぼ水平配置されているの
に対し、下部列の鉄筋は既設のフーチング２の上面傾斜
に沿って外方に向けて下降した傾斜配置となっている。Next, the upper end of the footing 2, that is, the pier 1
The fixing tool 4 shown in FIG. The fixing device 4 includes a holding plate 5 and an anchor reinforcing bar 6 extending laterally from the outer surface of the plate 5. The height of the holding plate is such that the lower end portion of the vertically aligned high-strength fiber sheet 3a is pressed from the outside, while the horizontal alignment high-strength fiber sheet 3b is pressed.
, And has a height of about 35 cm in this embodiment. The upper end 7 of the holding plate is slightly curved outward,
This is because, when the pier 1 reinforced with the high-strength fiber sheet is deformed by an earthquake, if the upper end of the holding plate 5 has a vertical corner, the pier 1 may be broken at the corner. The anchor reinforcing bars 6 are provided in horizontal rows at the top and bottom, respectively, and the reinforcing bars 6 in the upper row are arranged almost horizontally, while the reinforcing bars in the lower row extend outward along the upper surface inclination of the existing footing 2. It is an inclined arrangement that descends toward it.
【００１１】橋脚１の下方部には水平な２個の小孔８が
左右に貫通して設けられ、また上記定着具４の押えプレ
ート５の上方部には透孔９が穿設され、定着具４の押え
プレート５を橋脚１の左右の面に接して配置したとき
に、橋脚１の小孔８と押えプレート５の透孔９とが一直
線上に位置し、これらの孔８、９を通してＰＣ鋼棒挿通
用のシース管１０が挿通されるようになっている。Two small horizontal holes 8 are provided in the lower part of the pier 1 so as to penetrate left and right, and a through-hole 9 is formed in the upper part of the holding plate 5 of the fixing tool 4 to fix the fixing tool 4. When the holding plate 5 of the fixture 4 is arranged in contact with the left and right surfaces of the pier 1, the small holes 8 of the pier 1 and the through holes 9 of the holding plate 5 are located on a straight line, and through these holes 8, 9, A sheath tube 10 for inserting a PC steel rod is inserted.
【００１２】この定着具４の設置の際に、好ましくは押
えプレート５と橋脚に貼付した高強度繊維シート３ａと
は接着剤を介して接着する。定着具４の設置と前後して
新設フーチング用の補強鉄筋１１が既設のフーチング２
の上面及び左右側面を取り囲むように配筋される。この
補強鉄筋１１が配筋された後に定着具４のアンカー鉄筋
６が補強鉄筋１１に添接して結着される。フーチングの
下方前後端部には左右に貫通する小孔１２を形成し、Ｐ
Ｃ鋼棒挿通用のシース管１３を挿通する。When the fixing device 4 is installed, preferably, the holding plate 5 and the high-strength fiber sheet 3a attached to the pier are bonded via an adhesive. Before and after the fixing device 4 is installed, a reinforcing steel bar 11 for a new footing is installed.
Are arranged so as to surround the upper surface and the left and right side surfaces of the. After the reinforcing reinforcing bars 11 are arranged, the anchor reinforcing bars 6 of the fixing device 4 are attached to and bonded to the reinforcing reinforcing bars 11. A small hole 12 penetrating left and right is formed at the lower front and rear ends of the footing.
The sheath tube 13 for inserting the C steel rod is inserted.
【００１３】しかる後、補強鉄筋１１の外周に型枠を設
置し、コンクリートを打設して、既設フーチング２の外
側にこれと一体化した新設フーチング１４を構築する。
コンクリートが硬化した後に上記のシース管１０、１３
にＰＣ鋼棒（図示せず）を挿通し、新設フーチングの外
側からＰＣ鋼棒に緊張力を加えることによって、既設フ
ーチング２と新設フーチング１４の一体化を強固にする
と共に、既設橋脚１に貼付した高強度繊維シート３ａを
定着具４の押えプレート５によって強力に圧着して新設
フーチング１４内に一体的に固定する。その後、押えプ
レート５の湾曲した上端７と既設の橋脚との間の隙間か
ら雨水等が侵入しないようにシール材（図示せず）を充
填する。After that, a formwork is installed on the outer periphery of the reinforcing steel bar 11 and concrete is poured in, and a new footing 14 integrated with the existing footing 2 is constructed outside the existing footing 2.
After the concrete has hardened, the above-mentioned sheath tubes 10, 13
A PC steel rod (not shown) is inserted through the new footing, and a tension is applied to the PC steel rod from the outside of the new footing to strengthen the integration of the existing footing 2 and the new footing 14 and to attach the existing footing 1 to the existing pier 1. The high-strength fiber sheet 3a thus obtained is strongly pressed by the holding plate 5 of the fixing device 4, and is integrally fixed in the newly installed footing 14. Thereafter, a sealing material (not shown) is filled so that rainwater or the like does not enter from a gap between the curved upper end 7 of the holding plate 5 and the existing pier.
【００１４】尚、本発明の上記実施例では既設の橋脚１
に小孔８を形成するとともに定着具の押えプレート５に
透孔９を形成し、これらに緊張材としてＰＣ鋼棒を挿通
して緊張力を加えるようにしたが、このような構成は本
発明の必須の要件ではなく、このようなＰＣ鋼棒による
緊張力をを加えなくても、新設のフーチング打設時にお
けるコンクリートの側圧によって定着具の押えプレート
５は高強度繊維シートを既設橋脚に強固に圧着して所期
の目的を達成することができる。In the above embodiment of the present invention, the existing pier 1
A small hole 8 is formed in the through hole 9 and a through hole 9 is formed in the holding plate 5 of the fixing device, and a PC steel rod is inserted into these holes as a tension member to apply a tension. This is not an essential requirement, and even if the tension by the PC steel bar is not applied, the holding plate 5 of the fixing tool can firmly attach the high-strength fiber sheet to the existing pier by the lateral pressure of the concrete when the new footing is cast. To achieve the intended purpose.
【００１５】[0015]
【発明の効果】既設の橋脚等の脚体の外周に貼付された
高強度繊維シートの下端部は新設の補強用フーチング内
に埋設された定着具の押えプレートによって脚体に挟圧
されるため、フーチング内にこれと一体的かつ強固に固
定された形となり、脚体を補強用繊維シートによって極
めて有効に補強することができる。As described above, the lower end of the high-strength fiber sheet attached to the outer periphery of the existing pier or other leg is pressed by the fixing plate of the fixing device embedded in the newly installed reinforcing footing. And the footing is integrally and firmly fixed in the footing, and the legs can be very effectively reinforced by the reinforcing fiber sheet.
【００１６】また、脚体に水平方向の小孔を貫通形成
し、この小孔と連通するように前記定着具のプレートに
透孔を穿設し、これらの小孔及び透孔を挿通してＰＣ鋼
棒を補強用フーチングの外面まで延設し、この補強用フ
ーチングの外面にてＰＣ鋼棒に緊張力を付与する場合に
は、上記プレートの脚体に対する圧着力はより一層強化
され、従って高強度繊維シートによる補強力も増大され
ることになる。Further, a horizontal hole is formed through the leg, and a through hole is formed in the plate of the fixing device so as to communicate with the small hole, and the small hole and the through hole are inserted. When the PC steel bar is extended to the outer surface of the reinforcing footing and the PC steel bar is tensioned on the outer surface of the reinforcing footing, the pressure of the plate against the leg is further enhanced, and The reinforcing strength of the high-strength fiber sheet will also be increased.
【図１】本発明の方法において定着具を設置しかつ新設
のフーチング用の補強鉄筋を配筋した状態を示す正面
図。FIG. 1 is a front view showing a state in which a fixing device is installed and a newly installed reinforcing steel reinforcing bar for footing is arranged in the method of the present invention.
【図２】図１の状態における側断面図。FIG. 2 is a side sectional view in the state of FIG. 1;
【図３】本発明の方法において使用する定着具を示す斜
視図。FIG. 3 is a perspective view showing a fixing tool used in the method of the present invention.
【図４】図１の状態からコンクリートを打設した状態を
一部断面して示す正面図。4 is a front view showing a state in which concrete is cast from the state of FIG.
１ 橋脚 ２ 既設のフーチング ３ａ 縦揃え強化繊維シート ３ｂ 横揃え強化繊維シート ４ 定着具 ５ 押えプレート ６ アンカー鉄筋 １１ 補強鉄筋 １４ 新設フーチング DESCRIPTION OF SYMBOLS 1 Bridge pier 2 Existing footing 3a Vertical alignment reinforced fiber sheet 3b Horizontal alignment reinforced fiber sheet 4 Fixing tool 5 Holding plate 6 Anchor reinforcing bar 11 Reinforcing reinforcing bar 14 New footing
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 平３−224901（ＪＰ，Ａ) 特開 昭61−270464（ＪＰ，Ａ) 実開 平４−20522（ＪＰ，Ｕ) ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-3-224901 (JP, A) JP-A-61-270464 (JP, A) JP-A-4-20522 (JP, U)
Claims (2)
脚等の脚体を補強するに際し、該脚体の下方部に高強度
繊維シートを該フーチングとの接合部まで貼付し、縦方
向に延長する押えプレートとこのプレートの外面から横
方向に延長するアンカー鉄筋を有する定着具の該押えプ
レートを該フーチングとの接合部から該高強度繊維シー
トを貼付した該脚体の外面に取り付け、該定着具の該ア
ンカー鉄筋を既設の該フーチングの外側に配筋された補
強用フーチングの鉄筋に添接し、該補強用フーチングの
鉄筋の外周に型枠を設置してからコンクリートを打設し
てなることを特徴とする橋脚等の脚体の補強方法。When reinforcing a leg such as an existing bridge pier integrated with an existing footing, a high-strength fiber sheet is attached to a lower portion of the leg up to a joint with the footing, and is vertically extended. The fixing plate having a holding plate extending and an anchor reinforcing bar extending laterally from an outer surface of the plate is attached to an outer surface of the leg to which the high-strength fiber sheet is attached from a joint with the footing. The anchor rebar of the fixing device is attached to the reinforcing bar of the reinforcing footing arranged outside the existing footing, and a concrete frame is placed on the outer periphery of the reinforcing bar of the reinforcing footing, and then concrete is poured. A method of reinforcing a pier such as a pier.
該小孔と連通するように透孔を穿設した前記押えプレー
トを用い、前記コンクリートの打設後に該小孔及び該透
孔を挿通して緊張材を前記補強用フーチングの外面まで
延設し、該補強用フーチングの外面にて該緊張材に緊張
力を付与して該補強用フーチングを前記既設のフーチン
グと一体的に結合してなることを特徴とする橋脚等の脚
体の補強方法。2. A horizontal hole is formed through the leg body.
Using the holding plate having a through hole so as to communicate with the small hole, inserting the tendon into the outer surface of the reinforcing footing by inserting the small hole and the through hole after the concrete is cast. A method of reinforcing a leg such as a pier, wherein a tension is applied to the tension member on an outer surface of the reinforcing footing and the reinforcing footing is integrally connected to the existing footing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3355566A JP2720675B2 (en) | 1991-12-24 | 1991-12-24 | How to reinforce legs such as piers |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3355566A JP2720675B2 (en) | 1991-12-24 | 1991-12-24 | How to reinforce legs such as piers |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05171620A JPH05171620A (en) | 1993-07-09 |
| JP2720675B2 true JP2720675B2 (en) | 1998-03-04 |
Family
ID=18444645
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3355566A Expired - Lifetime JP2720675B2 (en) | 1991-12-24 | 1991-12-24 | How to reinforce legs such as piers |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2720675B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4858843B2 (en) * | 2007-02-15 | 2012-01-18 | 清水建設株式会社 | Reinforcement structure for tower structure foundation and method for reinforcement of tower structure foundation |
| JP5300389B2 (en) * | 2008-09-18 | 2013-09-25 | 東海旅客鉄道株式会社 | Bridge support structure and construction method |
| JP2014205989A (en) * | 2013-04-12 | 2014-10-30 | 東日本旅客鉄道株式会社 | Bridge pier reinforcing structure and bridge pier reinforcing method |
-
1991
- 1991-12-24 JP JP3355566A patent/JP2720675B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH05171620A (en) | 1993-07-09 |
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