JP2003313826A - Reinforcing method and reinforcing structure of concrete bridge girder by pretensioned frp tension member - Google Patents

Reinforcing method and reinforcing structure of concrete bridge girder by pretensioned frp tension member

Info

Publication number
JP2003313826A
JP2003313826A JP2002122949A JP2002122949A JP2003313826A JP 2003313826 A JP2003313826 A JP 2003313826A JP 2002122949 A JP2002122949 A JP 2002122949A JP 2002122949 A JP2002122949 A JP 2002122949A JP 2003313826 A JP2003313826 A JP 2003313826A
Authority
JP
Japan
Prior art keywords
tension
bridge girder
concrete
frp
reinforcing
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.)
Pending
Application number
JP2002122949A
Other languages
Japanese (ja)
Inventor
Seiroku Miyama
清六 深山
Kazuyoshi Nishina
一義 仁科
Kiyokazu Shinagawa
清和 品川
Shinya Saiki
真也 齋木
Original Assignee
Pc Bridge Co Ltd
ピーシー橋梁株式会社
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Pc Bridge Co Ltd, ピーシー橋梁株式会社 filed Critical Pc Bridge Co Ltd
Priority to JP2002122949A priority Critical patent/JP2003313826A/en
Publication of JP2003313826A publication Critical patent/JP2003313826A/en
Pending legal-status Critical Current

Links

Abstract

<P>PROBLEM TO BE SOLVED: To provide a reinforcing method and reinforcing structure of a bridge girder capable of easily and effectively performing the repair and reinforcement of an existing concrete bridge, which required a large-scaled work with technical difficulty and also large cost in the past, particularly, for the reinforcement of the bridge girder. <P>SOLUTION: This reinforcing method and reinforcing structure comprises, in the repairing or reinforcing work of the existing concrete bridge, laying a plurality of lengthy bar-like fiber-reinforced plastic (FRP) tension materials on the lower surface of the concrete-made bridge girder of the concrete bridge along the longitudinal direction of the bridge girder, prestressing each of the FRP tension material, then spraying mortar so that the FRP tension materials are buried and fixed to the lower surface of the bridge girder, and integrating the existing concrete bridge girder to the FRP tension materials to improve the resistance to the tensile strength applied to the bridge girder lower part. <P>COPYRIGHT: (C)2004,JPO

Description

【発明の詳細な説明】Detailed Description of the Invention
【0001】[0001]
【発明の属する技術分野】 既設コンクリート橋桁のプ
レテンション方式によりプレストレスを導入したFRP
(Fiber Reinforced Plastics)緊張材による補強方
法に関する。
TECHNICAL FIELD The present invention relates to an FRP in which prestress is introduced by a pretensioning method for an existing concrete bridge girder.
(Fiber Reinforced Plastics) Reinforced plastics method.
【0002】[0002]
【従来の技術】 わが国の社会資本は、戦後の復興期か
ら経済成長期にかけ、比較的短期間に整備されてきた。
これら社会資本の一つにコンクリート橋がある。コンク
リート橋は、道路、鉄道、水路等の輸送路において、輸
送の障害となる河川、渓谷、湖沼、海峡あるいは他の道
路、鉄道、水路等の上方にこれらを横断するために建設
される構造物のうち、輸送路を直接支える、いわゆる橋
桁の主要材料として、鉄筋コンクリート(RC)、プレ
ストレストコンクリート(PC)、鉄骨鉄筋コンクリー
ト(SRC)、無筋コンクリート等を使用したものであ
る。上述のようにコンクリート橋は主に鋼とコンクリー
トで構成され耐久性に富んだ構造物ではあるが、昭和2
0年代に建設されたコンクリート橋は既に50年以上使
用されており、その都度補修を重ねてはいても、コンク
リートのひび割れ・剥離、鉄筋の露出・腐食等による経
年劣化は免れられず、脆弱化の進んだものも多くなって
きている。また、近年、物流の増大に伴う車両の大型化
と交通量の増加、海砂の使用に伴う塩害によるコンクリ
ート構造物の劣化の加速、阪神・淡路大震災以降の耐震
性強化の要求等さまざまな要因から、既設コンクリート
橋の補強が必要になってきている。しかし、これら既設
のコンクリート橋をすべて架け替えるとなると莫大な費
用を要することになる。従来、コンクリート橋の補修・
補強は、橋梁としての機能が大幅に低下した場合に行う
という事後保全が一般的であった。しかし、上記の要求
に応え、かつ社会資本への効率的な投資を図る立場から
は、コンクリート橋が耐用年数(寿命)に達する以前に
その橋の損傷状況や、周辺環境条件の変化等に配慮し、
かつその橋の持つ重要性をも勘案して、計画的に補修・
補強することが重要視されるようになってきている。
[Prior Art] Japan's social capital has been maintained in a relatively short period from the post-war reconstruction period to the economic growth period.
One of these social capital is the concrete bridge. A concrete bridge is a structure constructed to cross a river, a valley, a lake, a strait or other roads, railways, waterways, etc. that obstruct the transportation of transportation routes such as roads, railways, waterways, etc. Among them, reinforced concrete (RC), prestressed concrete (PC), steel-framed reinforced concrete (SRC), unreinforced concrete, etc. are used as main materials for so-called bridge girders that directly support transportation routes. As mentioned above, concrete bridges are mainly composed of steel and concrete and are highly durable structures.
Concrete bridges constructed in the 0's have been in use for more than 50 years, and even if repairs are repeated each time, deterioration over time due to cracking / peeling of concrete, exposure / corrosion of reinforcing bars, etc. is inevitable and weakened. The number of advanced products is increasing. In addition, in recent years, various factors such as the increase in the size of vehicles and the increase in traffic due to the increase in physical distribution, the acceleration of deterioration of concrete structures due to salt damage due to the use of sea sand, the demand for earthquake resistance after the Great Hanshin-Awaji Earthquake, etc. Therefore, it is necessary to reinforce the existing concrete bridge. However, replacing all of these existing concrete bridges would require enormous costs. Conventionally, repair of concrete bridge
Reinforcement was generally done after the fact that the function as a bridge was significantly reduced. However, from the standpoint of meeting the above requirements and investing effectively in social capital, consideration should be given to the damage status of concrete bridges and changes in the surrounding environmental conditions before their useful life (life) is reached. Then
In addition, taking into account the importance of the bridge, planned repairs
Reinforcement is becoming more important.
【0003】コンクリート橋の補修・補強には、主に次
のような工法が用いられている。 A.コンクリートのひび割れへの樹脂注入・充填 コンクリートのひび割れへの樹脂注入・充填は、コンク
リート表面に生じたひび割れからの浸水や湿気侵入に起
因する鉄筋・鉄骨等の腐食や、侵入水分の凍結によるコ
ンクリートの剥離などを防止するための補修工法で、補
強工事に併せて行われる場合が多い。
The following construction methods are mainly used for repairing and reinforcing concrete bridges. A. Injecting and filling resin into cracks in concrete Injecting and filling resin into cracks in concrete causes corrosion of reinforcing bars, steel frames, etc. due to water intrusion and moisture intrusion from the cracks on the concrete surface, and freezing of infiltrated water It is a repair method to prevent peeling, and is often performed in conjunction with reinforcement work.
【0004】B.コンクリート欠損部への樹脂パテやセ
メントモルタルの充填 コンクリート欠損部への樹脂パテやセメントモルタルの
充填は、コンクリートの剥離・欠損により露出する鉄筋
の腐食を防止するために行われる補修工法で、応急処置
としての使用が多い。
B. Filling of resin putty or cement mortar into a concrete defect part Filling resin putty or cement mortar into a concrete defect part is a repair method that is used to prevent corrosion of the rebar exposed by peeling or loss of concrete. Often used as.
【0005】C.鋼板やFRPシートのコンクリート部
材への接着 厚さ10mm程度の鋼板又はFRPシートのコンクリー
ト部材へのエポキシ樹脂などの接着剤による接着は、床
版など比較的断面の小さなコンクリート部材の補修や局
部的な補強工法であり、コンクリート部材表面の補強、
防護にも効果がある。
C. Adhesion of steel plates and FRP sheets to concrete members Adhesion of steel plates or FRP sheets with a thickness of about 10 mm to concrete members with an adhesive such as epoxy resin is used to repair concrete members with relatively small cross-sections such as floor slabs and local Reinforcement method, to reinforce the surface of concrete members,
Also effective in protection.
【0006】D.橋桁、橋脚など大型コンクリート部材
への外ケーブルを用いたプレストレス導入 コンクリート部材に複数本のPC鋼材を定着具を介して
狭着又は添着し、前記PC鋼材にプレストレスを導入す
ることによってコンクリート部材に圧縮応力を与えてひ
び割れを閉じ込めるとともに、コンクリート部材に加わ
る引張力への対応力を増加させる工法で、ひび割れの発
生したコンクリート部材の補修・補強に有効である。
D. Introduction of prestress using external cables to large concrete members such as bridge girders and bridge piers A plurality of PC steel materials are narrowly attached or attached to a concrete member via a fixing tool, and prestress is introduced into the PC steel materials to provide concrete members. It is a construction method that applies compressive stress to the concrete to confine cracks and increases the response force to the tensile force applied to the concrete members, and is effective for repairing and reinforcing concrete members that have cracks.
【0007】E.劣化コンクリート部分の打ち換え コンクリート表面のひび割れや剥離等の劣化による鉄筋
の腐食やコンクリート部材断面積の減少に伴う強度不足
等をに対応するための補修・補強工法で、劣化した個所
のコンクリートを削り(はつり)取り、その後に新しい
コンクリート等を打ち込み露出した鉄筋をコンクリート
内に封じ込めて鉄筋の腐食を防止し、かつ必要断面積を
回復して橋梁としての必要強度を確保する。
E. Replacing deteriorated concrete parts Scraping the deteriorated concrete with repair / reinforcement construction methods to cope with corrosion of reinforcing bars due to deterioration such as cracking and peeling of concrete surface and lack of strength due to decrease in cross-sectional area of concrete members. (Crossing), and after that, new concrete etc. is driven in and the exposed reinforcing bars are sealed in the concrete to prevent corrosion of the reinforcing bars, and the required cross-sectional area is restored to secure the required strength as a bridge.
【0008】F.コンクリート部材の断面増や部材の増
設 コンクリート部材の断面増や部材の増設は、橋桁、橋脚
等の本格的な補強工法で、前記Eの「劣化コンクリート
部分の打ち換え」と併用されることがある。ただし、橋
桁や橋脚の増設は工事が大規模になり、技術的に困難な
場合が多い。
F. Increasing the cross section of concrete members and increasing the number of members Increasing the cross section of concrete members and increasing the number of members is a full-scale reinforcement construction method for bridge girders, piers, etc., and may be used in combination with "Replacement of deteriorated concrete parts" in E above. . However, the addition of bridge girders and piers is technically difficult in many cases due to the large-scale construction work.
【0009】G.橋桁の引張応力発生側へのFRPシー
トの貼着 橋桁の引張応力発生側へのFRPシートの貼着は、橋桁
に加わる荷重による撓みにより橋桁下面発生する引張応
力を連続繊維で強化されたFRPシートの貼着によって
前記FRPシートに負担させ、橋桁の曲げおよび剪断に
対する耐力を向上させる補強工法である。前記Fの「コ
ンクリート部材の断面増および部材の増設」に比べれば
工事は容易だが、橋桁自体の荷重(死荷重)増に対して
の補強には効果がなく、路面を走行する車両によっても
たらされる変化する荷重(活荷重)に対しての補強にと
どまる。
G. Adhesion of FRP sheet on the tensile stress generation side of bridge girders Adhesion of FRP sheet on the tensile stress generation side of bridge girders is an FRP sheet in which the tensile stress generated on the underside of the bridge girder is reinforced by continuous fibers due to bending due to the load applied to the bridge girder. It is a reinforcing construction method in which the FRP sheet is loaded by the sticking and the proof strength of the bridge girder against bending and shearing is improved. The work is easier than the above-mentioned “F section increase of concrete members and addition of members”, but it is not effective in reinforcing the load (dead load) of the bridge girder itself, and is provided by the vehicle traveling on the road surface. Only reinforcement for changing loads (live loads).
【0010】[0010]
【発明が解決しようとしている課題】 既設コンクリー
ト橋の補修・補強、特に橋桁の補強に関しては、上記従
来の技術のD「外ケーブルによるプレストレスの導
入」、F「橋桁断面の増大や橋桁の増設」等で記したと
おり、いずれも工事が大規模となり、技術的にも困難が
伴い、経費もかかる。また従来の技術G「FRPシート
の貼着」も、D、Fの補強方法に比べれば工事は容易で
経費の面でも優位ではあるが、橋桁自体の荷重(死荷
重)増に対する補強には効力がない。そこで橋桁下面に
プレテンション方式でプレストレスを導入したFRP緊
張材を固着することによって、外ケーブルを用いたPC
橋桁のように、前記橋桁自体の荷重(死荷重)にも作用
する橋桁補強方法を提供する。
[Problems to be Solved by the Invention] Regarding repair / reinforcement of existing concrete bridges, particularly reinforcement of bridge girders, D “Introduction of prestress by outer cable” of the above-mentioned conventional technology, F “Increase of bridge girder cross section and addition of bridge girders” As mentioned above, all of them require large-scale construction, are technically difficult, and costly. In addition, the conventional technology G “adhesion of FRP sheet” is easier in construction and superior in cost than the reinforcement method of D and F, but it is effective for reinforcement against increase in load (dead load) of bridge girder itself. There is no. Therefore, by fixing the FRP tension material that introduced prestress by the pretension method to the underside of the bridge girder, PC using the outer cable
A bridge girder reinforcement method that acts on the load (dead load) of the bridge girder itself, like a bridge girder.
【0011】[0011]
【課題を解決するための手段】 本発明者は次ぎに示す
方法によって上記課題を解決した。 (1)既設コンクリート橋の補修、補強工事において、
前記コンクリート橋のコンクリート製橋桁の下面に、橋
桁の長さ方向に沿って長尺板状又は棒状のFRP緊張材
を複数本添設し、前記複数本のFRP緊張材それぞれに
プレストレスを導入した後、前記橋桁下面にFRP緊張
材が埋設、固着されるようにモルタルを吹きつけ、前記
既設コンクリート橋桁と前記FRP緊張材とを一体構造
にして、橋桁下部に加わる引張応力を負担させることに
より、曲げ及びせん断力への耐性を向上させることを特
徴とするコンクリート橋桁の補強方法。
Means for Solving the Problems The present inventor has solved the above problems by the following method. (1) In repairing and reinforcing existing concrete bridges,
On the lower surface of the concrete bridge girder of the concrete bridge, a plurality of long plate-shaped or rod-shaped FRP tension members are attached along the length direction of the bridge girder, and prestress is introduced to each of the plurality of FRP tension members. After that, by burying the mortar so that the FRP tension member is embedded and fixed on the lower surface of the bridge girder, the existing concrete bridge girder and the FRP tension member are made into an integral structure, and the tensile stress applied to the lower part of the bridge girder is borne, A method for reinforcing a concrete bridge girder characterized by improving resistance to bending and shearing forces.
【0012】(2)前記FRP緊張材の橋桁下面への添
設が、FRP緊張材を添設する区間の両端部に近い位置
の橋桁下面にアンカーによって一時仮設される緊張側定
着具および固定側定着具を介してなされ、前記FRP緊
張材の一方の端部が固定側定着具に嵌着される一対のく
さびで挟持・固定され、FRP緊張材のもう一方の端部
が前記緊張側定着具に付設される緊張ジャッキによって
掴持され、前記緊張ジャッキの操作により前記FRP緊
張材にプレストレスを導入することを特徴とする前項
(1)に記載のコンクリート橋桁の補強方法。
(2) The FRP tension member is attached to the underside of the bridge girder. The tension side fixing device and the fixing side are temporarily installed by anchors on the underside of the bridge girder at positions near both ends of the section where the FRP tension member is attached. One end of the FRP tension member is clamped and fixed by a pair of wedges fitted to the fixed-side fixing member, and the other end of the FRP tension member is fixed to the tension-side fixing member. The method for reinforcing a concrete bridge girder according to the above item (1), characterized in that it is gripped by a tension jack attached to, and prestress is introduced into the FRP tension member by operating the tension jack.
【0013】(3)既設コンクリート橋の補修、補強工
事において、前記コンクリート橋のコンクリート製橋桁
の下面に、橋桁の長さ方向に沿って長尺板状又は棒状の
FRP緊張材を複数本添設し、前記複数本のFRP緊張
材それぞれにプレストレスを導入した後、前記橋桁下面
にFRP緊張材が埋設、固着されるようにモルタルを吹
きつけ、前記既設コンクリート橋桁と前記FRP緊張材
とを一体構造にしたことを特徴とするコンクリート橋桁
の補強構造。
(3) When repairing or reinforcing an existing concrete bridge, a plurality of long plate-shaped or rod-shaped FRP tension members are attached to the lower surface of the concrete bridge girder of the concrete bridge along the length direction of the bridge girder. Then, after introducing prestress to each of the plurality of FRP tension members, mortar is sprayed so that the FRP tension members are embedded and fixed on the lower surface of the bridge girder, and the existing concrete bridge girder and the FRP tension member are integrated. Reinforced structure of concrete bridge girders characterized by having a structure.
【0014】[0014]
【発明の実施の形態】 本発明の実施の形態を実施例の
図によって説明する。図1(a)はプレテンション方式
によりプレストレスを導入したFRP緊張材によって補
強されたT形コンクリート橋桁の斜視図、(b)は同橋
桁の断面図、(c)は同橋桁の一部分の側面図である。
図2はプレテンション方式によりプレストレスを導入し
たFRP緊張材による橋桁の補強方法を示す工程図であ
る。図において1は橋桁、2、2’、2”はFRP緊張
材、3、3’、3”はモルタル、4は緊張側定着具、5
は固定側定着具、6は緊張ジャッキ、7、7’はくさ
び、8はアンカー、9はモルタル吹き付けノズルを示
す。
Embodiments of the present invention will be described with reference to the drawings of the embodiments. Fig. 1 (a) is a perspective view of a T-shaped concrete bridge girder reinforced by FRP tension material with prestressing introduced by the pretensioning method, (b) is a cross-sectional view of the bridge girder, and (c) is a side view of a part of the bridge girder. It is a figure.
FIG. 2 is a process diagram showing a method of reinforcing a bridge girder with an FRP tension material introduced with prestress by the pretensioning method. In the figure, 1 is a bridge girder, 2 ', 2 "are FRP tension members, 3', 3" are mortar, 4 are tension side fixing tools, 5
Is a fixed fixing device, 6 is a tension jack, 7 and 7'are wedges, 8 is an anchor, and 9 is a mortar spray nozzle.
【0015】本発明は、図1に実施例として示したT形
橋桁にみられるように、引張応力が作用する橋桁1の下
面にプレテンション方式によりプレストレスを導入した
FRP緊張材2をモルタル3で固着して補強するもので
あり、図2に示す方法によりそれを実現している。以下
にプレテンション方式によりプレストレスを導入したF
RP緊張材による橋桁補強方法について図2により工程
順に説明する。
In the present invention, as seen in the T-shaped bridge girder shown as an example in FIG. 1, the mortar 3 is an FRP tension member 2 in which a prestress is introduced by a pretensioning method on the lower surface of the bridge girder 1 on which tensile stress acts. It is fixed by means of and is reinforced by the method shown in FIG. F which introduced pre-stress by the pre-tension method below
A bridge girder reinforcement method using RP tension material will be described in order of steps with reference to FIG.
【0016】 既設コンクリート橋桁1の脆弱化した
コンクリート面を「ウオータージェット削り(はつり)
装置」を用いて削り(はつり)、補修・補強部分の下地
処理を行う(本作業は図示せず)。ここで「ウオーター
ジェット削り(はつり)装置」は、超高圧ポンプで加圧
された水を噴流としてコンクリート構造物に打ち付け、
噴流水の圧力と流量とでコンクリートの削り(はつ
り)、剥離を行うものである。
"Water jet shaving" is performed on the weakened concrete surface of the existing concrete bridge girder 1.
The equipment is used for shaving (chipping), and the groundwork for the repair / reinforcement part is performed (this work is not shown). Here, the "water jet shaving device" hits the concrete structure with water pressurized by an ultra-high pressure pump as a jet,
Concrete is scraped (peeled) and separated by the pressure and flow rate of jet water.
【0017】 下地処理した橋桁1の下面に緊張側定
着具4及び固定側定着具5をFRP緊張材を添設する区
間長離してアンカー8を介して固着する。
The tension side fixing tool 4 and the fixing side fixing tool 5 are fixed to the lower surface of the bridge girder 1 which has been subjected to the base treatment via the anchor 8 while being separated from each other by the section length in which the FRP tension material is attached.
【0018】 橋桁下面に固着された緊張側定着具4
と固定側定着具5に設けられたFRP緊張材挿入用の貫
通孔を通して両定着具間にFRP緊張材を張設すること
により、前記FRP緊張材を橋桁下面に添設する。FP
R緊張材は、炭素繊維、アラミド繊維、ガラス繊維、合
成樹脂繊維等の強化材をエポキシ樹脂等で固めた繊維強
化プラスチックの板状又は棒状の緊張材で、PC鋼材に
比べて軽量、かつ耐食性に優れているという特徴を有し
ている。なお、固定側定着具5の貫通孔は、緊張側定着
具4に対する側の断面が狭く反対側に広い形状をなして
おり、この貫通孔の断面の大きい方から前記FRP緊張
材2を挟むようにしてくさび7、7’を挿入・嵌着し、
前記FRP緊張材2の一方の端部を固定側定着具5に挟
持させる。
Tension-side fixing device 4 fixed to the lower surface of the bridge girder
The FRP tension member is attached to the underside of the bridge girder by tensioning the FRP tension member between the fixing members through the through holes for inserting the FRP tension member provided in the fixed fixing device 5. FP
The R tension material is a plate-shaped or rod-shaped tension material made of fiber reinforced plastic obtained by hardening carbon fiber, aramid fiber, glass fiber, synthetic resin fiber, etc. with epoxy resin, etc., and is lighter and more corrosion resistant than PC steel material. It has the feature of being excellent. The through-hole of the fixed-side fixing device 5 has a narrow cross section on the side with respect to the tension-side fixing device 4, and has a wide shape on the opposite side. The FRP tension member 2 is sandwiched from the larger cross-section of the through-hole. Insert and fit wedges 7 and 7 ',
One end of the FRP tension member 2 is held by the fixed fixing device 5.
【0019】 緊張側定着具4に緊張ジャッキ6を取
り付け、緊張側定着具を貫通したFRP緊張材2のもう
一方の端部を緊張ジャッキ6に掴持させ、緊張ジャッキ
6を操作することによってFRP緊張材2にプレストレ
スを導入する。
The tension jack 6 is attached to the tension-side fixing tool 4, the other end of the FRP tension member 2 penetrating the tension-side fixing tool is held by the tension jack 6, and the tension jack 6 is operated to operate the FRP. Introduce prestress into the tendon 2.
【0020】 緊張ジャッキ6によりFRP緊張材2
にプレストレスを導入した状態で、緊張側定着具4と固
定側定着具5との間の橋桁1の下面に、前記FRP緊張
材2が埋設、固着されるようにショットクリート工法
(圧縮空気によりモルタル3をノズル9から噴射して吹
き付ける工法)によりモルタル3を吹き付け、この間の
前記既設コンクリート橋桁1と前記FRP緊張材2とを
一体構造とする。
The FRP tension material 2 by the tension jack 6
In a state where prestress is introduced to the underside of the bridge girder 1 between the tension side fixing tool 4 and the fixed side fixing tool 5, the FRP tension material 2 is embedded and fixed by the shotcrete method (compressed air is used). The mortar 3 is sprayed by a method of spraying the mortar 3 from the nozzle 9 and spraying it, and the existing concrete bridge girder 1 and the FRP tension member 2 in the meantime are integrated.
【0021】 吹き付けたモルタル3が下地処理した
橋桁1の下面に固着し既設橋桁1とFRP緊張材が一体
化した後、緊張ジャッキ6、緊張側定着具4、および固
定側定着具5を撤去する。
After the sprayed mortar 3 is fixed to the lower surface of the bridge girder 1 subjected to the ground treatment and the existing bridge girder 1 and the FRP tension member are integrated, the tension jack 6, the tension side fixing tool 4, and the fixing side fixing tool 5 are removed. .
【0022】 緊張ジャッキ6、緊張側定着具4、お
よび固定側定着具5の撤去により露出した前記FRP緊
張材の両端部2’、2”を橋桁1の下面に沿わせ、その
上からモルタル3’、3”を吹き付けて埋設し橋桁1の
下面に固着する。
Both ends 2 ′, 2 ″ of the FRP tension member exposed by removing the tension jack 6, the tension side fixing tool 4, and the fixed side fixing tool 5 are arranged along the lower surface of the bridge girder 1, and the mortar 3 '3' is sprayed and buried and fixed to the lower surface of the bridge girder 1.
【0023】 他に削った(はつった)部分(T形橋
桁の側面等)があればその部分にもモルタル3を吹き付
けて仕上げる。
If there are other parts that have been shaved off (sides of the T-shaped bridge girder, etc.), that part is also sprayed with mortar 3 to finish.
【0024】[0024]
【発明の効果】 本発明によって下記のような効果が期
待できる。 (1)比較的容易にコンクリート橋の橋桁の補強がで
き、経費の節減、および工期の短縮が期待できる。 (2)従来のFRPシートの橋桁下部への貼着による補
強では実現できなかった橋桁自体の荷重増に対する橋桁
下面の引張応力に対しても有効な補強手段を与えるとと
もにFRP緊張材自体の軽量性に基づく小荷重増で済む
ことになる。 (3)既に生じているコンクリートのひび割れを、プレ
ストレスの導入によって圧縮して閉じさせられる。 (4)既存橋桁内の鉄筋が負担する応力を低減できる。 (5)従来技術の「橋桁、橋脚など大型コンクリート部
材への外ケーブルを用いたプレストレスの導入」による
補修では、従来の橋形が変わらざるを得ないが、本発明
の補強はFRP緊張材が桁内に埋設されるため既設のコ
ンクリート桁の形状に大幅な変更がなく、従来の橋形、
及び景観がそのまま保持できる。 (6)緊張材に腐食しないFRPを用いるので、大規模
な補修が必要となる塩害環境にある橋梁の補修にも適用
できる。
According to the present invention, the following effects can be expected. (1) The bridge girders of concrete bridges can be reinforced relatively easily, which can be expected to save costs and shorten the construction period. (2) Providing an effective reinforcing means against the tensile stress on the underside of the bridge girder due to the increased load of the bridge girder itself, which could not be realized by the conventional reinforcement of the FRP sheet below the bridge girder, and the lightness of the FRP tension material itself. It will be possible to increase the small load based on. (3) Cracks in the concrete that have already occurred are compressed and closed by the introduction of prestress. (4) The stress that the reinforcing bars in the existing bridge girder bear can be reduced. (5) In the repair by the conventional technology "introduction of prestress using external cables to large-scale concrete members such as bridge girders and bridge piers", the conventional bridge shape must be changed, but the reinforcement of the present invention is FRP tension material. Since it is embedded in the girder, there is no significant change in the shape of the existing concrete girder.
And the landscape can be retained as it is. (6) Since FRP that does not corrode is used as the tension material, it can be applied to the repair of a bridge in a salt damage environment that requires a large-scale repair.
【図面の簡単な説明】[Brief description of drawings]
【図1】(a)プレテンション方式によりプレストレス
を導入したFRP緊張材によって補強されたT形コンク
リート橋桁の斜視図。 (b)プレテンション方式によりプレストレスを導入し
たFRP緊張材によって補強されたT形コンクリート橋
桁の断面図。 (c)プレテンション方式によりプレストレスを導入し
たFRP緊張材によって補強されたT形コンクリート橋
桁の一部分の側面図。
FIG. 1 (a) is a perspective view of a T-shaped concrete bridge girder reinforced by an FRP tension material introduced with prestressing by a pretensioning method. (B) Sectional drawing of the T-shaped concrete bridge girder reinforced by the FRP tension material which introduced the prestress by the pretension system. (C) A side view of a part of the T-shaped concrete bridge girder reinforced by the FRP tension material which introduced the prestress by the pretension system.
【図2】 プレテンション方式によりプレストレスを導
入したFRP緊張材による橋桁の補強方法を示す工程
図。
FIG. 2 is a process diagram showing a method of reinforcing a bridge girder with an FRP tension material in which prestress is introduced by a pretension system.
【符号の説明】[Explanation of symbols]
1:橋桁 2、2’、
2”:FRP緊張材 3、3’、3”:モルタル 4:緊張側定着
具 5:固定側定着具 6:緊張ジャッ
キ 7、7’:くさび 8:アンカー 9:モルタル吹き付けノズル
1: Bridge girder 2, 2 ',
2 ": FRP tension material 3, 3 ', 3": mortar 4: tension side fixing tool 5: fixed side fixing tool 6: tension jack 7, 7': wedge 8: anchor 9: mortar spray nozzle
───────────────────────────────────────────────────── フロントページの続き (72)発明者 品川 清和 東京都港区新橋6−17−19 ピーシー橋梁 株式会社内 (72)発明者 齋木 真也 東京都港区新橋6−17−19 ピーシー橋梁 株式会社内 Fターム(参考) 2D059 AA05 BB39 GG40    ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Kiyokazu Shinagawa             6-17-19 Shimbashi, Minato-ku, Tokyo PC Bridge             Within the corporation (72) Inventor Shinya Saiki             6-17-19 Shimbashi, Minato-ku, Tokyo PC Bridge             Within the corporation F-term (reference) 2D059 AA05 BB39 GG40

Claims (3)

    【特許請求の範囲】[Claims]
  1. 【請求項1】 既設コンクリート橋の補修、補強工事に
    おいて、前記コンクリート橋のコンクリート製橋桁の下
    面に、橋桁の長さ方向に沿って長尺板状又は棒状のFR
    P緊張材を複数本添設し、前記複数本のFRP緊張材そ
    れぞれにプレストレスを導入した後、前記橋桁下面にF
    RP緊張材が埋設、固着されるようにモルタルを吹きつ
    け、前記既設コンクリート橋桁と前記FRP緊張材とを
    一体構造にして、橋桁下部に加わる引張応力を負担させ
    ることにより、曲げ及びせん断力への耐性を向上させる
    ことを特徴とするコンクリート橋桁の補強方法。
    1. In the repair or reinforcement work of an existing concrete bridge, a long plate-shaped or rod-shaped FR is provided on the lower surface of the concrete bridge girder of the concrete bridge along the length direction of the bridge girder.
    After installing a plurality of P tension members and introducing prestress to each of the plurality of FRP tension members, F is attached to the lower surface of the bridge girder.
    By applying mortar so that the RP tension material is embedded and fixed, the existing concrete bridge girder and the FRP tension material are integrated into one structure, and the tensile stress applied to the lower part of the bridge girder is borne, so that the bending and shearing force A method for reinforcing a concrete bridge girder characterized by improving durability.
  2. 【請求項2】 前記FRP緊張材の橋桁下面への添設
    が、FRP緊張材を添設する区間の両端部に近い位置の
    橋桁下面にアンカーによって一時仮設される緊張側定着
    具および固定側定着具を介してなされ、前記FRP緊張
    材の一方の端部が固定側定着具に嵌着される一対のくさ
    びで挟持・固定され、FRP緊張材のもう一方の端部が
    前記緊張側定着具に付設される緊張ジャッキによって掴
    持され、前記緊張ジャッキの操作により前記FRP緊張
    材にプレストレスを導入することを特徴とする請求項1
    に記載のコンクリート橋桁の補強方法。
    2. A tension-side fixing tool and a fixing-side fixing, wherein the FRP tension member is attached to the lower surface of the bridge girder by temporarily anchoring it to the lower surface of the bridge girder at positions near both ends of the section where the FRP tension member is added. And one end of the FRP tension member is clamped and fixed by a pair of wedges fitted to the fixed-side fixing tool, and the other end of the FRP tension member is fixed to the tension-side fixing tool. 2. A pre-stress is introduced into the FRP tension member by being gripped by an attached tension jack and operating the tension jack.
    Reinforcement method for concrete bridge girders described in.
  3. 【請求項3】 既設コンクリート橋の補修、補強工事に
    おいて、前記コンクリート橋のコンクリート製橋桁の下
    面に、橋桁の長さ方向に沿って長尺板状又は棒状のFR
    P緊張材を複数本添設し、前記複数本のFRP緊張材そ
    れぞれにプレストレスを導入した後、前記橋桁下面にF
    RP緊張材が埋設、固着されるようにモルタルを吹きつ
    け、前記既設コンクリート橋桁と前記FRP緊張材とを
    一体構造にしたことを特徴とするコンクリート橋桁の補
    強構造。
    3. In the repair or reinforcement work of an existing concrete bridge, a long plate-shaped or rod-shaped FR is provided on the lower surface of the concrete bridge girder of the concrete bridge along the length direction of the bridge girder.
    After installing a plurality of P tension members and introducing prestress to each of the plurality of FRP tension members, F is attached to the lower surface of the bridge girder.
    A reinforcing structure for a concrete bridge girder, characterized in that the existing concrete bridge girder and the FRP tension member are made into an integral structure by spraying mortar so that the RP tension member is embedded and fixed.
JP2002122949A 2002-04-24 2002-04-24 Reinforcing method and reinforcing structure of concrete bridge girder by pretensioned frp tension member Pending JP2003313826A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2002122949A JP2003313826A (en) 2002-04-24 2002-04-24 Reinforcing method and reinforcing structure of concrete bridge girder by pretensioned frp tension member

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2002122949A JP2003313826A (en) 2002-04-24 2002-04-24 Reinforcing method and reinforcing structure of concrete bridge girder by pretensioned frp tension member

Publications (1)

Publication Number Publication Date
JP2003313826A true JP2003313826A (en) 2003-11-06

Family

ID=29538420

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2002122949A Pending JP2003313826A (en) 2002-04-24 2002-04-24 Reinforcing method and reinforcing structure of concrete bridge girder by pretensioned frp tension member

Country Status (1)

Country Link
JP (1) JP2003313826A (en)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010275837A (en) * 2009-06-01 2010-12-09 Shinko Wire Co Ltd Reinforcement method for girder, and reinforcement cable for outer cable
JP4634537B1 (en) * 2010-08-31 2011-02-23 黒沢建設株式会社 Bridge girder reinforcement structure
CN101768915B (en) * 2010-01-28 2012-04-18 南京工业大学 Composite material bow-shaped structural beam
CN103741577A (en) * 2013-12-30 2014-04-23 郑州大学 T-shaped beam bridge with lower flat connection and construction method of T-shaped beam bridge
CN104631347A (en) * 2015-01-26 2015-05-20 北京市市政工程研究院 Strengthening method for subway station tunnel and bridge structures along subway station tunnel
CN105178162A (en) * 2015-08-25 2015-12-23 张江涛 T-beam reinforcing structure and construction method thereof
CN106087692A (en) * 2016-06-30 2016-11-09 重庆交通大学 A kind of Simply supported non-uniform T negative moment of girder section structure and construction method
JP2017172275A (en) * 2016-03-25 2017-09-28 株式会社富士ピー・エス Reinforcement method of structure of using rod-like fiber-reinforced member
KR20200004129A (en) * 2018-07-03 2020-01-13 이일우 Strengthening method of concrete structures by pretensioning

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010275837A (en) * 2009-06-01 2010-12-09 Shinko Wire Co Ltd Reinforcement method for girder, and reinforcement cable for outer cable
CN101768915B (en) * 2010-01-28 2012-04-18 南京工业大学 Composite material bow-shaped structural beam
JP4634537B1 (en) * 2010-08-31 2011-02-23 黒沢建設株式会社 Bridge girder reinforcement structure
JP2012052319A (en) * 2010-08-31 2012-03-15 Kurosawa Construction Co Ltd Structure for reinforcing bridge girder
CN103741577A (en) * 2013-12-30 2014-04-23 郑州大学 T-shaped beam bridge with lower flat connection and construction method of T-shaped beam bridge
CN103741577B (en) * 2013-12-30 2015-08-12 郑州大学 A kind of T-shaped beam bridge and construction method thereof that bottom lateral bracing is set
CN104631347A (en) * 2015-01-26 2015-05-20 北京市市政工程研究院 Strengthening method for subway station tunnel and bridge structures along subway station tunnel
CN105178162A (en) * 2015-08-25 2015-12-23 张江涛 T-beam reinforcing structure and construction method thereof
JP2017172275A (en) * 2016-03-25 2017-09-28 株式会社富士ピー・エス Reinforcement method of structure of using rod-like fiber-reinforced member
CN106087692A (en) * 2016-06-30 2016-11-09 重庆交通大学 A kind of Simply supported non-uniform T negative moment of girder section structure and construction method
CN106087692B (en) * 2016-06-30 2017-10-20 重庆交通大学 A kind of Simply supported non-uniform T negative moment of girder section construction and construction method
KR20200004129A (en) * 2018-07-03 2020-01-13 이일우 Strengthening method of concrete structures by pretensioning
KR102140167B1 (en) * 2018-07-03 2020-07-31 이일우 Strengthening method of concrete structures by pretensioning

Similar Documents

Publication Publication Date Title
Meier Composite materials in bridge repair
JP2005090115A (en) Reinforcing construction method for existing floor slab by beam
US5457839A (en) Bridge deck system
Meier et al. CFRP bonded sheets
Tadros et al. Rapid replacement of bridge decks
JP2003313826A (en) Reinforcing method and reinforcing structure of concrete bridge girder by pretensioned frp tension member
JP2003328561A (en) Reinforcing method for concrete member and tensioning device for tendon used therein
KR20060095149A (en) Dead load composite system by temporary tensioning method
JP2012184575A (en) Method for repairing steel structure
JP4086863B2 (en) Continuous girder structure in double span girder bridge
Carolin Strengthening of concrete structures with CFRP: shear strengthening and full scale applications
KR20200043293A (en) Reinforcing method and reinforced structure of hinge portion in prestressed concrete girder bridge
Meier Structural tensile elements made of advanced composite materials
Nordin Fibre reinforced polymers in civil engineering: flexural strengthening of concrete structures with prestressed near surface mounted CFRP rods
JP2002146904A (en) Method for reinforcing concrete structure and reinforced concrete structure
Siwowski et al. Strengthening bridges with prestressed CFRP strips
JP6811678B2 (en) Method of joining concrete structures and concrete members to which continuous fiber reinforced concrete is applied
JPH08218326A (en) Reinforcing method of floor plate of elevated bridge
JP2513582B2 (en) Continuous concrete paving method
CN108824221A (en) Concrete continuous girder bridge web replacing and reinforcing method based on corrugated sheet steel
KR200326106Y1 (en) Prestressed reinforcing structure
JP2017082496A (en) Floor slab structure of steel bridge, floor slab replacement method of steel bridge and precast floor slab
Morcous et al. Synthesis of Repair Practices of Damaged Precast/Prestressed Concrete Girders
KR20040083961A (en) Repairing and reinforcing body of concrete structures forming using sheets of public works textile and method for repairing and reinforcing concrete structures using the repairing and reinforcing body
JP2006118191A (en) Construction method of concrete floor slab of composite floor slab bridge, and form structure

Legal Events

Date Code Title Description
A621 Written request for application examination

Free format text: JAPANESE INTERMEDIATE CODE: A621

Effective date: 20050411

A977 Report on retrieval

Free format text: JAPANESE INTERMEDIATE CODE: A971007

Effective date: 20070314

A131 Notification of reasons for refusal

Effective date: 20070516

Free format text: JAPANESE INTERMEDIATE CODE: A131

A02 Decision of refusal

Effective date: 20070919

Free format text: JAPANESE INTERMEDIATE CODE: A02