JPH0545747B2 - - Google Patents
Info
- Publication number
- JPH0545747B2 JPH0545747B2 JP21483685A JP21483685A JPH0545747B2 JP H0545747 B2 JPH0545747 B2 JP H0545747B2 JP 21483685 A JP21483685 A JP 21483685A JP 21483685 A JP21483685 A JP 21483685A JP H0545747 B2 JPH0545747 B2 JP H0545747B2
- Authority
- JP
- Japan
- Prior art keywords
- formwork
- concrete
- repair material
- repair
- repaired
- 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
- 238000009415 formwork Methods 0.000 claims description 35
- 239000004567 concrete Substances 0.000 claims description 33
- 239000000463 material Substances 0.000 claims description 23
- 238000000034 method Methods 0.000 claims description 21
- 238000011049 filling Methods 0.000 claims description 6
- 239000011083 cement mortar Substances 0.000 claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 11
- 238000007667 floating Methods 0.000 description 7
- 230000003014 reinforcing effect Effects 0.000 description 7
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 6
- 238000010276 construction Methods 0.000 description 5
- 238000002347 injection Methods 0.000 description 4
- 239000007924 injection Substances 0.000 description 4
- 239000004570 mortar (masonry) Substances 0.000 description 4
- 229920001971 elastomer Polymers 0.000 description 3
- 239000005060 rubber Substances 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 239000004568 cement Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 239000003973 paint Substances 0.000 description 2
- 238000010422 painting Methods 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 239000004575 stone Substances 0.000 description 2
- 229920003048 styrene butadiene rubber Polymers 0.000 description 2
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 1
- 239000002174 Styrene-butadiene Substances 0.000 description 1
- 229920006328 Styrofoam Polymers 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 239000011433 polymer cement mortar Substances 0.000 description 1
- 239000011150 reinforced concrete Substances 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000000565 sealant Substances 0.000 description 1
- 239000008261 styrofoam Substances 0.000 description 1
Landscapes
- Working Measures On Existing Buildindgs (AREA)
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明はコンクリート構造物の補修工法に関
し、さらに詳しくはコンクリートの中性化や塩害
等により、コンクリート中の鉄筋が発錆、膨張す
ることによつてコンクリートに亀裂を生じ、それ
が原因で桁、架橋床盤、梁などのコンクリートの
下端部が剥落た場合の補修工法に関する。[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a method for repairing concrete structures, and more specifically, it relates to a method for repairing concrete structures, and more specifically, it is a method for repairing concrete structures, and more specifically, it is a method for repairing concrete structures, and more specifically, it is a method for repairing concrete structures, and more specifically, it is a method for repairing concrete structures, and more specifically, it is a method for repairing concrete structures, and more specifically, it is a method for repairing concrete structures, and more specifically, it is a repair method for repairing concrete structures. This article relates to a repair method for cases where concrete cracks occur and the lower ends of the concrete, such as girders, bridge decks, beams, etc., fall off due to cracks.
土木建築分野で使用されているセメントコンク
リートは、セメント中にCaO分を多量に含むため
強度のアルカリ性であるが、空気中の炭酸ガスと
反応して表面から内部に向つて次第に中性化して
いく。鉄筋コンクリートの場合、鉄筋までこの中
性化が進むと鉄筋が発錆する。その際鉄筋が膨張
するので、その膨張力によりコンクリートは破壊
される。また海岸附近においてはコンクリート中
に塩分が浸透し、これが内部の鉄筋を腐食しコン
クリートを破壊させることになる。これらは放置
すると次第に内部まで破壊が進行するので補修し
なければならない。
Cement concrete used in the civil engineering and construction field is highly alkaline because it contains a large amount of CaO, but it gradually becomes neutral from the surface to the inside as it reacts with carbon dioxide gas in the air. . In the case of reinforced concrete, if this carbonation progresses to the reinforcing bars, the reinforcing bars will rust. At this time, the reinforcing steel expands, and the concrete is destroyed by the expansion force. Also, near the coast, salt permeates into the concrete, corroding the internal reinforcing bars and causing the concrete to break down. If these are left unattended, damage will gradually progress to the inside, so they must be repaired.
従来の補修工法としては、亀裂を生じたり、破
壊しているコンクリート部分をはつつて除去し、
正常なコンクリート部分をむき出しにし、鉄筋の
錆を除去したのち、鉄筋には防錆塗装を施す等の
前処理をしたのち、セメントモルタルや樹脂モル
タル等の補修材をコテ塗りしたり、補修箇所に型
枠をセツトし、上記材料あるいはセメントコンク
リートを充填したり、または型枠内に砂利、砕石
等の骨材を先に詰め、後からセメントモルタルや
樹脂モルタルを注入する所謂プレパツクド工法が
採用されていた。 Conventional repair methods involve removing cracked or damaged concrete parts by removing them.
After exposing the normal concrete parts and removing the rust from the reinforcing bars, the reinforcing bars are pre-treated by applying anti-rust coating, etc., and then a repair material such as cement mortar or resin mortar is applied with a trowel to the repaired area. The so-called prepacked construction method is used, in which a formwork is set and filled with the above materials or cement concrete, or the formwork is first filled with aggregate such as gravel or crushed stone, and then cement mortar or resin mortar is poured into the formwork. Ta.
コンクリート構造物の中間部分に亀裂を生じた
り、剥離したりした場合の補修工法としては、上
記のように前処理をしたのち補修材をコテ塗りす
る方法が一般的であるが、下端部分の場合は補修
材を上方に向けて塗り付けねばならず、また塗り
付け施工中または施工後剥落しないよう塗り厚を
薄く何回にも分けて施工しなければならず、極め
て非能率的であるという欠点があつた。
The common repair method for cracks or peeling in the middle part of a concrete structure is to pre-treat as described above and then apply a repair material with a trowel, but in the case of the lower end part The disadvantage of this method is that the repair material must be applied upwards, and it must be applied thinly and in multiple parts to prevent it from peeling off during or after application, which is extremely inefficient. It was hot.
そこで補修箇所に予め型枠をセツトし補修材を
充填したり、プレパツクド工法を採用し、施工能
率を上げる方法が考えられた。しかしこれらの工
法は塗り付ける工法と異なつて、はつつた後の下
端補修面と型枠内に注入充填される補修材とが密
着しにくく、〓間ができるという欠点があつた。
密着しにくい理由としては、補修材であるモルタ
ルには水を含んでいるため、注入充填後時間が経
つにつれ充填部の上部に浮き水が生じ、この浮き
水が下端補修面と補修材との間に介在してしまう
ためと、はつつた下端補修面は平滑にならず、ど
うしても凹凸ができてしまい、この凹部に空気が
残つてしまうためである。 Therefore, methods were considered to increase construction efficiency by setting formwork in advance at the repaired area and filling it with repair material, or by adopting the pre-packed construction method. However, unlike the painting method, these methods have the disadvantage that it is difficult for the repair material injected into the formwork to come into close contact with the repaired surface of the lower end after it has been removed, resulting in gaps.
The reason for poor adhesion is that the repair material, mortar, contains water, so as time passes after injection and filling, floating water forms at the top of the filled area, and this floating water causes the contact between the bottom repair surface and the repair material. This is because the repaired surface of the bottom end is not smooth and uneven, and air remains in these recesses.
本発明者らは下端補修面と補修材との間に生じ
る〓間をなくし、補修材を密着させる方法につき
種々検討した結果、本発明に到達した。すなわち
その要旨は、コンクリート構造物の下端を補修す
るに際し、補修箇所に設けた、補修面より上に位
置する水抜き出口を有する型枠内に、セメントモ
ルタル系補修材を充填後、上記補修材が硬化しは
じめる頃より該型枠下面を上方に向けて押圧する
ことにより、浮き水を外部に排出することがで
き、またはつり面の凹部に存在する空気も外部に
押し出すことができ補修材とはつり面とを密着さ
せることを可能ならしめるコンクリート構造物の
補修工法である。
The present inventors have arrived at the present invention as a result of various studies on methods for eliminating the gap between the lower end repair surface and the repair material and bringing the repair material into close contact with each other. In other words, the gist is that when repairing the lower end of a concrete structure, after filling a cement mortar-based repair material into a formwork provided at the repaired area and having a drainage outlet located above the repaired surface, the repair material is By pressing the bottom surface of the formwork upwards from the time when the mold begins to harden, floating water can be discharged to the outside, or air existing in the recesses of the hanging surface can be pushed out to the outside. This is a repair method for concrete structures that allows for close contact with the chiseled surface.
本発明を図のコンクリート桁の例によつて説明
する。 The invention will be explained using the concrete girder example shown in the figure.
補修を要するコンクリート桁１の下面をはつつ
てはつり面（補修面）２を形成させ、むき出しに
なつた鉄筋３の錆の除去、防錆塗料の塗装等の前
処理を行つたのち、剥落防止用金網１２をとりつ
け、ついで補修箇所に型枠６をセツトする。この
場合はつり面の凹部にモルタルを薄く塗りはつり
面を平担化させると、浮き水と空気が残らないの
で好ましい。型枠６の幅は桁幅とほぼ同じである
が、上下方向にスライドさせることができるよう
に弾性ゴム１１を型枠と桁との間にはさんでお
く。型枠６には水抜き出口９を設け、その先端の
パイプ１０を上方に曲げておく。これによりコン
クリート桁底面部のはつり部分に凹凸、不陸が生
じてもコンクリート桁底面部より上に水抜き出口
が位置し、コンクリート桁側面部で水抜き出口穴
が塞がれることはない。 The lower surface of the concrete girder 1 that needs repair is removed to form a hanging surface (repaired surface) 2, and after pretreatment such as removing rust from the exposed reinforcing bars 3 and painting with anti-corrosion paint, the surface is removed to prevent flaking. A wire mesh 12 is attached, and then a formwork 6 is set at the repaired area. In this case, it is preferable to flatten the hanging surface by applying a thin layer of mortar to the recessed portions of the hanging surface, since floating water and air will not remain. The width of the formwork 6 is almost the same as the width of the girder, but elastic rubber 11 is sandwiched between the formwork and the girder so that it can be slid in the vertical direction. A water drain outlet 9 is provided in the formwork 6, and a pipe 10 at the tip thereof is bent upward. As a result, even if unevenness or unevenness occurs in the sloping part of the concrete girder bottom, the water drain outlet is located above the concrete girder bottom, and the water drain outlet hole is not blocked by the concrete girder side surface.
補修材４は型枠６に設けられた補修材注入口５
から型枠内に注入充填され、硬化しはじめる頃よ
り型枠下端に設けた油圧シリンダ７により型枠６
を上方に押圧する。油圧シリンダ７は支持枠８に
固定し、支持枠８はコンクリート桁に固定してお
く。 The repair material 4 is supplied through a repair material injection port 5 provided in the formwork 6.
It is injected into the formwork, and when it begins to harden, the formwork 6 is heated by the hydraulic cylinder 7 installed at the lower end of the formwork.
Press upward. The hydraulic cylinder 7 is fixed to a support frame 8, and the support frame 8 is fixed to a concrete girder.
型枠６を上方に押圧すると、ごくわずかづつ上
方に移動すると同時に水抜き出口９から浮き水と
はつり面２の凹部に存在していた空気とが排出さ
れ、浮き水はパイプ１０に滞留する。約３日乃至
１週間後に型枠６を外す。 When the formwork 6 is pressed upward, it moves upward very little at a time, and at the same time, the floating water and the air present in the recessed part of the hanging surface 2 are discharged from the drainage outlet 9, and the floating water stays in the pipe 10. The formwork 6 is removed after about 3 days to 1 week.
実施例、比較例
桁幅45cm、亀裂の入つている部分の下端の長さ
３ｍの桁の下端を約５cm高さで２箇所はつり取つ
た。むき出しになつた鉄筋の錆をハンマーでたた
き落した後、サンドブラスト処理し、防錆塗料を
塗布した。しかるのち、むき出しになつた筋に金
網を取りつけた。
Examples and Comparative Examples The lower end of a girder with a width of 45 cm and a length of 3 m at the lower end of the cracked part was lifted off at two locations at a height of approximately 5 cm. After knocking off the rust on the exposed reinforcing bars with a hammer, they were sandblasted and coated with anti-rust paint. Afterwards, wire mesh was attached to the exposed sinew.
長さ３ｍの×幅（内寸）47cm×高さ（内寸）10
cmの断面コ字状型枠２個を作製した。型枠底面に
は幅方向の中心に長手方向の両端部より50cmの位
置より50cm間隔で内径10mmの補修材注入口５個を
設けた。型枠側面部には上部より30mmの位置に、
750mm間隔で内径10mmの水抜き出口を両側面に各
５個設けた。型枠両側面内部には厚さ１cm×幅３
cm×長さ３ｍの弾性ゴムを上部と下部に４枚接着
した。 Length 3m x width (inner dimensions) 47cm x height (inner dimensions) 10
Two U-shaped formworks with a cross section of cm were fabricated. Five repair material inlets with an inner diameter of 10 mm were provided on the bottom of the form at 50 cm intervals from the center in the width direction and 50 cm from both ends in the longitudinal direction. On the side of the formwork, at a position 30mm from the top,
Five drainage outlets with an inner diameter of 10 mm were provided on each side at 750 mm intervals. Thickness 1cm x width 3 inside the formwork on both sides
Four pieces of elastic rubber measuring cm x 3 m in length were glued to the upper and lower parts.
この型枠内に底面より約45mmの高さ迄、砕石
（13〜20mm粒径）を充填した後、コンクリートは
つり面下端と型枠底板との間が５cmとなるように
型枠を桁補修箇所２ケ所にセツトした。型枠両端
部は発泡スチロール材を詰め、シーリング材で〓
間をシールした。 After filling this formwork with crushed stone (13-20mm grain size) to a height of approximately 45mm from the bottom, the formwork is repaired at the girder repair point so that the distance between the lower end of the hanging surface and the bottom plate of the formwork is 5cm. It was set in two places. Both ends of the formwork are filled with styrofoam and sealed with sealant.
I sealed the gap.
セツトするに当り、一方の型枠は桁幅方向に油
圧シリンダ２個、長手方向に型枠端部から25cmの
位置より50cm間隔で６個設置した。他方の型枠は
油圧シリンダの代わりにボルトを取りつけた支持
枠でセツトした。 To set one formwork, two hydraulic cylinders were installed in the width direction of the girder, and six hydraulic cylinders were installed in the longitudinal direction at 50cm intervals from a position 25cm from the end of the formwork. The other formwork was set using a support frame with bolts instead of a hydraulic cylinder.
型枠内に補修材としてSBR（スチレン・ブタジ
エン共重合体）系ポリマーセメントモルタルを
0.5〜２Kg／cm2の圧力で注入充填した。 Use SBR (styrene-butadiene copolymer) polymer cement mortar as a repair material in the formwork.
Injection filling was carried out at a pressure of 0.5 to 2 Kg/cm 2 .
油圧シリンダを設けた型枠は補修材注入終了２
時間後より、油圧シリンダで10Kg／cm2の圧をかけ
た。 Finished injecting repair material into the formwork equipped with hydraulic cylinders 2
After some time, a pressure of 10 kg/cm 2 was applied using a hydraulic cylinder.
３日後に型枠を外し、さらに25日間経過した
後、補修面より直径60mmのコアドリルで躯体コン
クリートに達する切れ目（深さ約６cm）を入れた
後、補修材と躯体コンクリートの接着強さを測定
した。油圧シリンダで加圧した部分は、10ケ所の
接着強さの平均値は21.3Kgｆ／cm2であつた。一方
圧を加えなかつた方は10ケ所中４ケ所がコアドリ
ル切断中に剥落し、残つた６ケ所の接着強さの平
均値は4.3Kgｆ／cm2であつた。 After 3 days, the formwork was removed, and after another 25 days, a cut (approximately 6 cm deep) reaching the concrete structure was made from the repaired surface using a core drill with a diameter of 60 mm, and the bond strength between the repair material and the concrete structure was measured. did. The average bond strength at 10 locations pressurized with a hydraulic cylinder was 21.3 Kgf/cm 2 . On the other hand, in the case where no pressure was applied, 4 of the 10 locations peeled off during cutting with the core drill, and the average bond strength of the remaining 6 locations was 4.3 kgf/cm 2 .
〔発明の効果〕
本発明の補修工法は型枠を上方に押圧するた
め、浮き水、空気が外部に排出され、はつり面と
補修材との間に〓間ができず、強力に密着させる
ことができる。さらにコテ塗り工法にくらべ施工
能力を大幅に向上させるというメリツトもある。[Effects of the Invention] Since the repair method of the present invention presses the formwork upward, floating water and air are discharged to the outside, and there is no gap between the chiseled surface and the repair material, resulting in strong adhesion. I can do it. It also has the advantage of greatly improving construction ability compared to the trowel coating method.
本発明の補修工法を説明するための図で補修す
べきコンクリート桁に型枠をセツトした状態の断
面図である。
１……コンクリート桁、２……はつり面（補修
面）、３……鉄筋、４……補修材、５……補修材
注入口、６……型枠、７……油圧シリンダ、８…
…支持枠、９……水抜き出口、１０……パイプ、
１１……弾性ゴム、１２……金網。
FIG. 2 is a cross-sectional view of a concrete girder to be repaired with formwork set therein for explaining the repair method of the present invention. 1... Concrete girder, 2... Hanging surface (repair surface), 3... Rebar, 4... Repair material, 5... Repair material injection port, 6... Formwork, 7... Hydraulic cylinder, 8...
...Support frame, 9...Drainage outlet, 10...Pipe,
11...Elastic rubber, 12...Wire mesh.
Claims (1)
し、補修箇所に設けた、補修面より上に位置する
水抜き出口を有する型枠内に、セメントモルタル
系補修材を充填後、上記補修材が硬化しはじめる
頃より該型枠下面を上方に向けて押圧することを
特徴とするコンクリート構造物の補修工法。1. When repairing the lower end of a concrete structure, after filling a cement mortar-based repair material into a formwork provided at the repaired area and having a drainage outlet located above the repaired surface, the repair material begins to harden. A method for repairing concrete structures, characterized by pressing the lower surface of the formwork upward from around the same time.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21483685A JPS6278360A (en) | 1985-09-30 | 1985-09-30 | Repairing of concrete structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21483685A JPS6278360A (en) | 1985-09-30 | 1985-09-30 | Repairing of concrete structure |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6278360A JPS6278360A (en) | 1987-04-10 |
| JPH0545747B2 true JPH0545747B2 (en) | 1993-07-12 |
Family
ID=16662340
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP21483685A Granted JPS6278360A (en) | 1985-09-30 | 1985-09-30 | Repairing of concrete structure |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6278360A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007332541A (en) * | 2006-06-12 | 2007-12-27 | Toray Ind Inc | Method for repairing concrete structure |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002250135A (en) * | 2001-02-23 | 2002-09-06 | Yoshiyuki Ogushi | Method for reinforcing concrete skeleton |
| JP4910200B2 (en) * | 2009-06-29 | 2012-04-04 | パシフィックコンサルタンツ株式会社 | Sectional repair method for concrete structures |
| JP7077010B2 (en) * | 2017-12-22 | 2022-05-30 | ショーボンド建設株式会社 | Reinforced structure of reinforced concrete structure and reinforcement method of reinforced concrete structure |
-
1985
- 1985-09-30 JP JP21483685A patent/JPS6278360A/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007332541A (en) * | 2006-06-12 | 2007-12-27 | Toray Ind Inc | Method for repairing concrete structure |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6278360A (en) | 1987-04-10 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109339828B (en) | Tunnel prestress inverted arch structure and construction method thereof | |
| CN105625197A (en) | Concrete beam bending reinforcing method based on steel plate-prestressed carbon fiber plate | |
| CN106801517B (en) | External reinforcing and reinforcing method for school shed with prefabricated porous plate brick mixed structure | |
| CA1084320A (en) | Joint sealing method | |
| CN105484391A (en) | Construction method for manufacturing heat-preservation waterproof wall through light heat-preservation GRC disassembling-free formworks | |
| CN102587681A (en) | Building reinforced structure and reinforcing method | |
| CN104863382B (en) | Roof boarding reinforcement means | |
| CN110670741A (en) | Method for processing deformation joint of building wall body | |
| JP2007092456A (en) | Reinforcement structure of and reinforcing method for constructed floor panel | |
| CN1108435C (en) | Anti-leakage compound wall of freeze well and its construction method | |
| JPH0545747B2 (en) | ||
| CN108755394A (en) | A kind of method of presstressed reinforcing steel reinforcement bridge abnormity pier stud | |
| JP3721005B2 (en) | Bridge with high-strength lightweight concrete slab | |
| CN107916797B (en) | Construction method for improving bearing performance of old building | |
| CN114753668B (en) | Construction method of unbonded prestressed steel wire rope reinforced brick masonry wall | |
| CN113513202A (en) | Construction method for pouring clear water concrete of garbage pool | |
| CN111894294A (en) | Protection architecture in basement outer wall post-cast strip | |
| Mander | Use of resins in road and bridge construction and repair | |
| CN206768879U (en) | A kind of poured band of outer wall of basement structure | |
| CN111321673A (en) | Bridge cylindrical pier template, assembling method and construction method of bridge cylindrical pier | |
| JPH07233620A (en) | Floor structure | |
| CN104818678A (en) | Simply supported hollow plate girder bending resistance reinforcement method | |
| CN212956175U (en) | Reinforcing structure of pedestrian bridge | |
| CN111877081B (en) | Construction method of cement pavement crushing plate assembled treatment structure | |
| US20070094968A1 (en) | Lightweight concrete panel and method of building structural members |