JPH0971910A - Reinforcing method of columnar structure - Google Patents
Reinforcing method of columnar structureInfo
- Publication number
- JPH0971910A JPH0971910A JP22659695A JP22659695A JPH0971910A JP H0971910 A JPH0971910 A JP H0971910A JP 22659695 A JP22659695 A JP 22659695A JP 22659695 A JP22659695 A JP 22659695A JP H0971910 A JPH0971910 A JP H0971910A
- Authority
- JP
- Japan
- Prior art keywords
- pilasters
- reinforcing
- concrete
- columnar structure
- tension
- 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.)
- Granted
Links
Landscapes
- Bridges Or Land Bridges (AREA)
- Working Measures On Existing Buildindgs (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は円形、長円形、楕円
形断面などを有する円柱状構造物、例えば、橋脚や柱な
どの円柱状構造物の補強方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for reinforcing a columnar structure having a circular, oval or elliptical cross section, for example, a columnar structure such as a pier or a column.
【０００２】[0002]
【従来の技術】阪神大災害を機会に橋脚や、建物の柱な
どの耐震性に問題が生じ、構造物の耐震基準の見直しや
従前の耐震基準で構築された既設構造物の補強などが緊
急の課題となってきた。既設構造物の補強の方法として
は、例えば橋脚においては既設橋脚の表面にコンクリー
トを巻き立てる方法、炭素系繊維などをシート状にした
ものを構造物の外表面に接着する方法、あるいは薄鋼板
で外表面を巻き立てるなどの方法で行われている。[Prior Art] The Hanshin catastrophe causes a problem in seismic resistance of piers and columns of buildings, and it is urgent to revise the seismic resistance standards of structures and to reinforce existing structures constructed according to the existing seismic standards. Has become an issue. As a method of reinforcing existing structures, for example, in the case of piers, a method of winding concrete on the surface of the existing pier, a method of adhering sheet-shaped carbon fiber etc. to the outer surface of the structure, or a thin steel plate is used. It is done by winding the outer surface.
【０００３】しかし、コンクリートの巻き立て、炭素系
繊維シートの接着、鋼板巻き立てなどは簡便ではあるも
のの、これらの補強は構造物に過大な荷重が作用し変形
が生じた後に初めて補強材に荷重負担が遷移する構造系
となっており、構造物に変形が生ずる以前に補強作用を
しないものである。また、補強構造が補強部と一体化し
ていないので長期に亘り構造物と一体性が保たれるかど
うか不明であるという問題点もある。However, although it is easy to wind up concrete, bond carbon fiber sheets, wind up steel plate, etc., the reinforcement of these is only applied to the reinforcing material after an excessive load acts on the structure and deformation occurs. It is a structural system in which the load transitions, and does not reinforce before the structure is deformed. Further, since the reinforcing structure is not integrated with the reinforcing portion, there is a problem that it is unclear whether or not the reinforcing structure is kept integrated with the structure for a long period of time.
【０００４】[0004]
【発明が解決しようとする課題】本発明は補強構造を既
設構造物と一体化し、通常の荷重状態の下でも載荷負担
をし、変位そのものを積極的に抑制する構造系を有する
補強方法を提供することを目的とする。DISCLOSURE OF THE INVENTION The present invention provides a reinforcing method having a structural system in which a reinforcing structure is integrated with an existing structure so as to bear a load even under a normal load condition and positively suppress displacement itself. The purpose is to do.
【０００５】[0005]
【課題を解決するための手段】本発明は円柱状構造物の
外周に、裏込めコンクリート層空間をあけて、上下に細
長い多数のプレキャストコンクリートピラスタを取付
け、前記コンクリート層中に多数の円周方向ＰＣ緊張材
を配設し、裏込めコンクリート打設後、該ＰＣ緊張材を
緊張しその端部を前記ピラスタに定着することを特徴と
する円柱状構造物の補強方法である。さらに具体的に説
明すると、次の通りである。According to the present invention, a large number of elongated precast concrete pilasters are attached vertically to the outer periphery of a columnar structure with a backfilling concrete layer space provided, and a large number of circumferential lines are provided in the concrete layer. A method for reinforcing a columnar structure is characterized in that a direction PC tension material is arranged, and after the backfilling concrete is placed, the PC tension material is tensioned and the end thereof is fixed to the pilaster. A more specific description is as follows.
【０００６】既設柱状構造物表面に、円周方向に均等に
複数分割した位置に、分割した周長より短尺の幅でＰＣ
緊張材挿通シースと定着構造を内蔵した円柱軸方向に長
い短冊状のプレキャストコンクリートピラスタ（以下単
にピラスタ）を構造物表面から裏込めコンクリートの厚
み分を離間して立添設する。半周又は一周のＰＣ緊張材
を、構造物表面とピラスタ裏面間に、水平に配設して、
ＰＣ緊張材端をピラスタ内で交差するように挿通し、Ｐ
Ｃ緊張材の作業余長をピラスタより突出させておく。隣
り合うピラスタ間に型枠を組立てて、型枠裏面及びピラ
スタ裏面と構造物表面との間にコンクリート、又はモル
タルを充填する。コンクリート又はモルタルが硬化後、
ピラスタに反力をとって、ＰＣ緊張材を緊張して、既設
柱状構造物に中心に向けて圧縮力を付与して構造物を補
強する。On the surface of the existing columnar structure, the PC is divided into a plurality of positions evenly in the circumferential direction and has a width shorter than the divided circumference.
A strip-shaped precast concrete pilaster (hereinafter simply referred to as pilaster) that is long in the axial direction of the cylinder and has a tension material insertion sheath and a fixing structure is installed vertically from the surface of the structure with the thickness of the backfill concrete separated. Half or one round of PC tension material is placed horizontally between the front surface of the structure and the back surface of the Pilaster,
Insert the PC tension material end so that it intersects in the Pilaster, and
C Allow the working length of the tension material to protrude from the pilaster. A mold is assembled between adjacent pillars, and concrete or mortar is filled between the back surface of the mold and the back surface of the pillar and the surface of the structure. After the concrete or mortar hardens,
The reaction force is applied to the pillar and the PC tension member is tensioned to apply a compressive force toward the center of the existing columnar structure to reinforce the structure.
【０００７】[0007]
【発明の実施の形態】直径３ｍの円柱状構造物１である
橋脚の地上部５ｍを被覆補強した例を説明する。図１は
その断面図、図２は斜視図である。この補強に用いるピ
ラスタ５として全幅５０ｃｍ、長さ２．５ｍ、厚さ１２
ｃｍ、重量約３５０ｋｇで、裏面は幅方向に若干の凹面
をもたせた部材を工場製品として製作した。円柱状構造
物１の外径周長は約９．４２ｍであり、構造物１基当た
りピラスタ５を８枚使用した。BEST MODE FOR CARRYING OUT THE INVENTION An example of covering and reinforcing the above-ground portion 5m of a pier, which is a cylindrical structure 1 having a diameter of 3m, will be described. 1 is a sectional view thereof, and FIG. 2 is a perspective view thereof. Pilaster 5 used for this reinforcement has a width of 50 cm, a length of 2.5 m, and a thickness of 12.
cm, the weight was about 350 kg, and a member having a slightly concave surface on the back side in the width direction was manufactured as a factory product. The outer circumference of the columnar structure 1 was about 9.42 m, and eight pillars 5 were used per structure.
【０００８】ＰＣ緊張材３の挿通孔間隔は、上下方向に
２５ｃｍピツチとしてピラスタ内に内蔵した。なお、Ｐ
Ｃ緊張材３の定着位置は８枚のピラスタ５に分散させる
が、ピラスタ５は汎用性をもたせるためすべて同一の仕
様で製作した。図３に示すように、円柱状構造物１の表
面に墨出しをして、８枚のピラスタ５の取付アンカ用孔
６を穿設し、ホールインアンカ１１を内挿固定する。The interval between the insertion holes of the PC tension member 3 was built in the pilaster as a pitch of 25 cm in the vertical direction. Note that P
The fixing positions of the C-tension material 3 are distributed to the eight pilasters 5, but the pilasters 5 are all manufactured with the same specifications in order to have versatility. As shown in FIG. 3, the surface of the cylindrical structure 1 is marked out, holes 8 for mounting anchors of the eight pillars 5 are bored, and the hole-in anchors 11 are inserted and fixed.
【０００９】縦補強鉄筋２を円柱状構造物１の周囲に組
立て、工場から搬入したピラスタ５を、それぞれ所定位
置に設置したホールインアンカ１１に仮止めし、裏込め
コンクリート４の厚さ、すなわち円柱状構造物１の表面
とピラスタ裏面との離間間隔を２０ｃｍに調整しナット
１２，１３で固定する。ＰＣ緊張材３は３６０度配置
（図４）として、摩擦により緊張力の低下が集中しない
ように、水平段位置によって適宜定着するピラスタ５を
変えてＰＣ緊張材３（１Ｔ１２．７ＰＣストランド）を
挿通した。The vertical reinforcing bars 2 are assembled around the cylindrical structure 1, and the pilasters 5 brought in from the factory are temporarily fixed to the hole-in anchors 11 installed at predetermined positions, respectively, and the thickness of the backfill concrete 4, that is, The spacing between the front surface of the columnar structure 1 and the back surface of the pillar is adjusted to 20 cm, and the nuts 12 and 13 are fixed. The PC tension member 3 is arranged at 360 degrees (Fig. 4), and the pillar tensioner 5 that is properly fixed is changed depending on the horizontal step position so that the decrease in tension force is not concentrated by friction, and the PC tension member 3 (1T12.7PC strand) is inserted. did.
【００１０】ピラスタ相互間に垂直型枠８を組立て、裏
込めコンクリート４を打設する。裏込めコンクリート４
が硬化したら、型枠８を取り外し、ピラスタ５から交差
して突出しているＰＣ緊張材３に２台の緊張ジャッキを
装着して緊張する。その後、ＰＣ緊張材３のシースダク
トにグラウトを注入し、ＰＣ緊張材３の定着部１４及び
未使用定着用孔の後埋めをして補強が完了する。The vertical formwork 8 is assembled between the pilasters and the backfill concrete 4 is placed. Backfill concrete 4
When is hardened, the form 8 is removed, and two tension jacks are attached to the PC tension member 3 which projects from the pilaster 5 so as to be tensioned. After that, grout is injected into the sheath duct of the PC tension material 3, and the fixing portion 14 and the unused fixing hole of the PC tension material 3 are filled up afterwards to complete the reinforcement.
【００１１】本例では、８枚のピラスタを使用したが、
これに限定されるわけではなく構造物の径によって適宜
選択することが可能である。ピラスタの幅と、隣り合う
ピラスタ間の間隔とのバランスと、表面から浮き出てる
ピラスタによって仕上後の円柱状構造物はスレンダ感
（ほっそりとした美感）が生まれ、景観上の効果も生じ
る。Although eight pilasters are used in this example,
It is not limited to this, and can be appropriately selected depending on the diameter of the structure. Due to the balance between the width of the pillar and the distance between the adjacent pillars, and the pillars protruding from the surface, the cylindrical structure after finishing gives a slender feeling (slender aesthetic feeling) and also produces a landscape effect.
【００１２】また、ＰＣ緊張材の巻付角度（円柱状構造
物の中心角）も、構造物の直径とピラスタの使用枚数に
応じ適宜設定することが好ましい。本発明の補強方法で
使用するプレキャストコンクリートピラスタは裏込めコ
ンクリートを介装し、表面は直平面でよく、裏面の凹面
も構造物外径に厳密に合わせる必要はないので、広い範
囲の構造物外径のものに使用可能である。長さについて
も、標準的なものを製作しておいて現物に合わせ、切断
組合せることも可能であり、工場で複数サイズのものを
大量生産することによってコストも低くなるメリットも
ある。Further, it is preferable that the winding angle of the PC tension member (center angle of the columnar structure) is also appropriately set according to the diameter of the structure and the number of pilasters used. The precast concrete pilaster used in the reinforcing method of the present invention has backfilled concrete interposed, the surface may be a straight surface, and the concave surface of the back surface does not need to be strictly adjusted to the outer diameter of the structure, so that a wide range of structures can be constructed. It can be used for outer diameters. Regarding the length, it is also possible to manufacture a standard one, match it with the actual one, and cut and combine it. There is also an advantage that the cost can be reduced by mass-producing multiple sizes in the factory.
【００１３】上記実施例は断面が真円の柱状構造物につ
いて述べたが、本発明は断面が楕円状構造物でも応用可
能である。Although the above-mentioned embodiment describes a columnar structure having a perfect circular cross section, the present invention can be applied to a structure having an elliptical cross section.
【００１４】[0014]
【発明の効果】本発明の補強方法によれば、構造物に変
位を生じてから補強効果が現れるのではなく、構造物そ
のものを補強するもので一体化された好適な補強方法で
ある。本発明では、大量生産可能なプレキャストピラス
タを使用することによって鉄筋、型枠の組払いを最小限
に止めることができ、補強が容易である。さらにこの方
法では施工後の柱の表面に縦じま模様のアクセントが生
まれ、新設構造物と見紛うようなすぐれた景観を得るこ
とができ、美観上も好ましく、構造上も堅固な補強が可
能となった。According to the reinforcing method of the present invention, the reinforcing effect does not appear after the structure is displaced, but it is a suitable reinforcing method that is integrated with the structure itself. In the present invention, by using the precast pillars that can be mass-produced, the reassembling of the reinforcing bar and the formwork can be minimized, and the reinforcement is easy. Furthermore, with this method, vertical striped accents were created on the surface of the post-construction pillar, and it was possible to obtain an excellent landscape that could be mistaken for a new structure, which is aesthetically pleasing and solidly reinforced. .
【図１】実施例の横断面図である。FIG. 1 is a cross-sectional view of an example.
【図２】実施例の斜視図である。FIG. 2 is a perspective view of an example.
【図３】実施例の取付部詳細図である。FIG. 3 is a detailed view of a mounting portion of the embodiment.
【図４】実施例の定着部詳細図である。FIG. 4 is a detailed view of a fixing unit according to the exemplary embodiment.
１ 円柱状構造物 ２ 鉄筋 ３ ＰＣ緊張材 ４ コンクリー
ト ５ ピラスタ ６ 孔 ８ 型枠 １１ ホールイン
アンカ １２ ナット １３ ナット １４ 定着部1 Cylindrical Structure 2 Reinforcing Bar 3 PC Tensile Material 4 Concrete 5 Pilaster 6 Hole 8 Formwork 11 Hole In Anchor 12 Nut 13 Nut 14 Anchoring Section
Claims (1)
ート層空間をあけて、上下に細長い多数のプレキャスト
コンクリートピラスタを取付け、前記コンクリート層中
に多数の円周方向ＰＣ緊張材を配設し、裏込めコンクリ
ート打設後、該ＰＣ緊張材を緊張しその端部を前記ピラ
スタに定着することを特徴とする円柱状構造物の補強方
法。1. A backfilling concrete layer space is provided on the outer periphery of a columnar structure, and a large number of elongated precast concrete pillars are attached to the top and bottom, and a large number of circumferential PC tension members are arranged in the concrete layer. Then, the method for reinforcing a columnar structure is characterized in that after the backfilling concrete is placed, the PC tension material is tensioned and the end thereof is fixed to the pilaster.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22659695A JP2682974B2 (en) | 1995-09-04 | 1995-09-04 | Reinforcement method for cylindrical structures |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22659695A JP2682974B2 (en) | 1995-09-04 | 1995-09-04 | Reinforcement method for cylindrical structures |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0971910A true JPH0971910A (en) | 1997-03-18 |
| JP2682974B2 JP2682974B2 (en) | 1997-11-26 |
Family
ID=16847672
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP22659695A Expired - Fee Related JP2682974B2 (en) | 1995-09-04 | 1995-09-04 | Reinforcement method for cylindrical structures |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2682974B2 (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003090012A (en) * | 2001-09-17 | 2003-03-28 | Toko Tekko Kk | Pier reinforcing structure by corrugated steel material |
| KR20040008977A (en) * | 2002-07-20 | 2004-01-31 | 주식회사 후레씨네코리아 | Method for Reinforcing Concrete Structure Using Curved Tendon and Saddle Apparatus therefor |
| JP2007009482A (en) * | 2005-06-29 | 2007-01-18 | Nittetsu Corrosion Prevention Co Ltd | Reinforcing structure and reinforcing method of concrete structure |
| JP2007239395A (en) * | 2006-03-10 | 2007-09-20 | East Japan Railway Co | Stud structure |
| CN103061251A (en) * | 2013-01-10 | 2013-04-24 | 何成俊 | Bridge load bearing pillar with pillar height 8 times of pillar diameter for armored concrete bridge shallow plate-pile foundation |
| JP2016169493A (en) * | 2015-03-11 | 2016-09-23 | 三井住友建設株式会社 | Structure and method for reinforcing existing concrete structure |
| CN112160258A (en) * | 2020-10-30 | 2021-01-01 | 中铁四院集团工程建设有限责任公司 | Concrete repairing method for bridge pier body |
-
1995
- 1995-09-04 JP JP22659695A patent/JP2682974B2/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003090012A (en) * | 2001-09-17 | 2003-03-28 | Toko Tekko Kk | Pier reinforcing structure by corrugated steel material |
| KR20040008977A (en) * | 2002-07-20 | 2004-01-31 | 주식회사 후레씨네코리아 | Method for Reinforcing Concrete Structure Using Curved Tendon and Saddle Apparatus therefor |
| JP2007009482A (en) * | 2005-06-29 | 2007-01-18 | Nittetsu Corrosion Prevention Co Ltd | Reinforcing structure and reinforcing method of concrete structure |
| JP4608376B2 (en) * | 2005-06-29 | 2011-01-12 | 日鉄防蝕株式会社 | Reinforcing structure and reinforcing method for concrete structure |
| JP2007239395A (en) * | 2006-03-10 | 2007-09-20 | East Japan Railway Co | Stud structure |
| JP4628288B2 (en) * | 2006-03-10 | 2011-02-09 | 東日本旅客鉄道株式会社 | Structure of the pedestal |
| CN103061251A (en) * | 2013-01-10 | 2013-04-24 | 何成俊 | Bridge load bearing pillar with pillar height 8 times of pillar diameter for armored concrete bridge shallow plate-pile foundation |
| JP2016169493A (en) * | 2015-03-11 | 2016-09-23 | 三井住友建設株式会社 | Structure and method for reinforcing existing concrete structure |
| CN112160258A (en) * | 2020-10-30 | 2021-01-01 | 中铁四院集团工程建设有限责任公司 | Concrete repairing method for bridge pier body |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2682974B2 (en) | 1997-11-26 |
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