JP3792691B2 - Repair and reinforcement methods for narrow manholes - Google Patents
Repair and reinforcement methods for narrow manholes Download PDFInfo
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- JP3792691B2 JP3792691B2 JP2003398467A JP2003398467A JP3792691B2 JP 3792691 B2 JP3792691 B2 JP 3792691B2 JP 2003398467 A JP2003398467 A JP 2003398467A JP 2003398467 A JP2003398467 A JP 2003398467A JP 3792691 B2 JP3792691 B2 JP 3792691B2
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Description
本発明は、人孔内老朽コンクリート構造物において、とくにその隅角部とその壁面の補強を目的とした老朽マンホールの狭隘箇所対応補修・補強工法に関する。 The present invention relates to a method for repairing / reinforcing a narrow manhole in an old manhole, particularly for the purpose of reinforcing corners and wall surfaces thereof, in an old concrete structure in a manhole.
老朽マンホールの狭隘箇所対応補修・補強ないし人孔内コンクリート構造物の補修は、特許文献では公知例がみられない。
トンネルにおけるコンクリート壁面の補修方法は知られている（例えば、特許文献１参照）、また地下鉄用トンネルについてコンクリート壁の補修方法が知られている（例えば、特許文献２参照）。
There are no known examples in the patent literature for repair / reinforcement of narrow manholes or repair of concrete structures in manholes.
A method for repairing a concrete wall surface in a tunnel is known (for example, see Patent Document 1), and a method for repairing a concrete wall for a subway tunnel is known (for example, see Patent Document 2).
築造年度の古い人孔内コンクリート構造物は、交通規模の発達等による載荷重の増大変化に伴い、また経年に応じてひび割れが発生し、中性化が進行して内部鉄筋が腐食し、他方昭和４０年度時代に築造されたコンクリートの質が良くないもの或いは無筋で築造されたものがあり、強度不足等劣化が進行している。そのため、そのようなコンクリート構造物の補修、補強が、しかも低コストで施工されることが強く求められている。 The old manhole concrete structures in the construction year are accompanied by an increase in the load due to the development of the traffic scale, etc., and cracks occur with the passage of time. Some of the concrete built in the Showa 40 era is of poor quality or built without reinforcement, and deterioration such as insufficient strength is advancing. Therefore, it is strongly demanded that such a concrete structure be repaired and reinforced at a low cost.
詳しくは、図３に、出入り口のマンホール１０に連結された地中内のコンクリート構造物２０の単位断面２０ｓについて、応力・ひずみの関係図が略示されている。この単位断面は幅狭い門型（幅が平均１．２−１．８ｍ、高さが平均１．５−２．５ｍ）であり、トンネルの場合は円形（特許文献１、図１参照）ないし馬蹄形で、幅が比較的広い。この門型断面２０ｓは地面における載荷重による上下方向の応力またその応力の分圧として左右横方向の応力により隅角部にはマイナス（−）の曲げモーメントが、上下及び左右側面の壁面にはプラス（＋）の曲げモーメントが強く影響（内部鉄筋により変化する）を受けている。このため、このような老朽コンクリート構造物のとくに隅角部及び壁面部の補強が必要であることが理解される。
Specifically, FIG. 3 schematically shows a stress / strain relationship diagram for the unit cross section 20s of the
また、コンクリートの質について、水量が多いかセメント量が少ない、いわゆるシャブコンで打設されたコンクリート構造物が、前記したように昭和４０年時代によく施工されていると言われており、このようなコンクリート構造物、さらにコンクリートの質は正常でも鉄筋が正しく配置されていない構造物についても同様の補強が必要である。 As for the quality of concrete, it is said that a concrete structure placed with so-called shabu-con, which has a large amount of water or a small amount of cement, is well constructed in the 1965 period as described above. The same reinforcement is necessary for concrete structures that are normal, but also for structures that are normal in quality but are not properly reinforced.
トンネルのコンクリート構造物と違って、人孔内コンクリート構造物はその内部の幅が小さく、そこに電気ケーブルが束になって輻輳しており、補修作業が極めて小さい狭隘なスペースしかない悪条件のもとでこれを克服して行われる必要がある。 Unlike concrete structures in tunnels, concrete structures in manholes are narrow in width, and electric cables are bundled there and congested, so there is only a narrow space where repair work is extremely small. It is necessary to overcome this originally.
本発明の課題は、人孔内老朽コンクリート構造物において、隅角部補強についてはラーメン構造としての補強をはかってマイナス（−）側の曲げモーメントによる応力を抑え、コンクリート壁面についてはその劣化による腐食を防止してプラス（＋）側の曲げモーメントによる応力を抑えることができ、幅が狭いスペースでも施工できる、老朽マンホールの狭隘箇所対応補修・補強工法を提供することである。 The object of the present invention is to reduce the stress due to the negative (−) side bending moment by reinforcing the corner portion of the concrete structure in an old manhole as a ramen structure, and to corrode the concrete wall due to its deterioration. It is possible to prevent stress caused by bending moment on the plus (+) side, and to provide a repair / reinforcement method for narrow manholes that can be installed even in narrow spaces.
前記した隅角部補強について、この課題を解決するために、隅角部から直近の隣接する２つの面に、かつその奥行き方向の適当間隔毎に、アンカーボルトを打ち込み、該ボルトの頭部を介して同様の奥行き方向の適当間隔毎に異型鉄筋を緊結し、これらの部材を含浸させるよう樹脂モルタルを手詰めにより打設して左官仕上げを行って、隅角部を補強する。 In order to solve this problem with respect to the corner portion reinforcement described above, anchor bolts are driven into two adjacent surfaces closest to the corner portion at appropriate intervals in the depth direction, and the head portion of the bolt is fixed. Then, atypical reinforcing bars are fastened at appropriate intervals in the same depth direction, resin mortar is placed by hand so as to impregnate these members, and plastering is performed to reinforce the corners.
また前記したコンクリート壁面について、この課題を解決するために、上下壁面及び又は左右壁面について下地処理を施した上で、含浸接着剤を使って炭素繊維シートを貼り付け、表面仕上げを行って、コンクリート壁を補強する。 In addition, in order to solve this problem for the above-mentioned concrete wall surface, the upper and lower wall surfaces and / or the left and right wall surfaces are subjected to a ground treatment, and then a carbon fiber sheet is attached using an impregnating adhesive, and the surface finish is performed. Reinforce the wall.
本発明の方法によれば、人孔内老朽コンクリート構造物の隅角部補強についてはラーメン構造としての補強をはかってマイナス（−）側の曲げモーメントによる応力を抑え、コンクリート壁面についてはその劣化による腐食を防止してプラス（＋）側の曲げモーメントによる応力を抑えることができ、幅が狭いスペースで施工できる（図２参照）。 According to the method of the present invention, the corner portion of an aged concrete structure in a manhole is strengthened as a ramen structure to suppress the stress due to a negative (−) side bending moment, and the concrete wall surface is deteriorated due to its deterioration. Corrosion is prevented and stress due to the bending moment on the plus (+) side can be suppressed, and construction can be performed in a narrow space (see FIG. 2).
人孔内老朽コンクリート構造物の隅角部から直近の隣接する２つの面に、かつその奥行き方向の適当間隔毎に、アンカーボルトを打ち込み、該ボルトの頭部を介して同様の奥行き方向の適当間隔毎に鉄筋を緊結し、これらの部材を含浸させるよう樹脂モルタルを手詰めにより打設して左官仕上げを行って、隅角部を補強する。
この補強部の壁面と、下地処理を施した上下壁面及び左右壁面とに、含浸接着剤を使って炭素繊維シートを貼り付け、表面仕上げを行って、コンクリート壁を補強する。
なお、隅角部の補強に使う樹脂モルタルは、セメント、シラス、硅砂７号、ソーダー灰、水分強力吸収剤、ギンナン（海藻）、石粉及び水からなる急結材混入モルタルに、アクリルエマルジョンを添加したものを使う。
Anchor bolts are driven into the two adjacent surfaces closest to the corners of the aging concrete structure in the manhole at appropriate intervals in the depth direction, and the same depth direction appropriateness is passed through the heads of the bolts. Reinforcing the reinforcing bars at every interval, placing resin mortar by hand packing so that these members are impregnated, and performing plastering to reinforce the corners.
A carbon fiber sheet is affixed to the wall surface of the reinforcing portion, the upper and lower wall surfaces and the left and right wall surfaces subjected to the base treatment using an impregnation adhesive, and the concrete wall is reinforced by reinforcing the surface.
The resin mortar used to reinforce the corner is added with an acrylic emulsion to the mortar containing cement, shirasu, cinnabar No. 7, soda ash, strong water absorbent, ginnan (seaweed), stone powder and water. Use what you did.
本発明の好適な実施例は図面に基づいて説明される。
図１は、その１実施例を示した工程例示図である。丸で囲んだ数字１−６について説明する。
１では、人孔内老朽コンクリート構造物の隅角部２２から直近の隣接する２つの面２４，２６に、かつその奥行き方向の適当間隔毎に、ドリルＤｒにより孔を空けておき、
２では、それぞれの孔にアンカーボルト２２ａを打ち込み、
３では、該ボルト２２ａの頭部を介して同様の奥行き方向の適当間隔毎に鉄筋、好ましくは異型鉄筋２２ｆを針金などにより緊結し、
４では、これらの補強材が奥行き方向の適当間隔、例えば２５０ｍｍのピッチで配列され、取り付けられ、
５では、これらの部材を含浸させるよう樹脂モルタル２２ｒを手詰めにより打設して左官仕上げを行って、隅角部２２（例えば上辺、側辺が約１０−２０ｃｍ）の補強を行っている。
６では、この補強部壁面及び他の壁面も一緒に含浸接着剤を使って炭素繊維シート２２ｃを貼り付け、表面仕上げを行って、コンクリート壁を補強する。
A preferred embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a process example diagram showing one embodiment. The circled numbers 1-6 will be described.
1, holes are drilled with a drill Dr at two
2, the
3, reinforcing bars, preferably atypical reinforcing
4, these reinforcing materials are arranged and attached at an appropriate interval in the depth direction, for example, a pitch of 250 mm,
In No. 5, the
In No. 6, the
コンクリート隅角部の補強についてその中に充填する樹脂モルタルは、セメント水の止水効果が優れているものとして、次のような配合からなるものが好ましい。例えば内容量１８ｋｇについて各配合量及び重量％がそれぞれ示されている。
セメント １２．５ｋｇ ６９．０％
シラス １．０ｋｇ ５．５％
硅砂７号 ４．０ｋｇ ２２．２％
ソーダー灰 １．２ｋｇ ６．７％
水分強力吸収剤 ０．２ｋｇ ０．１％
ギンナン（海藻） ０．２ｋｇ ０．１％
石 粉 ０．５ｋｇ ２．７％
なお、水は１：１で同量が使われ、これにより急結材混入モルタルが形成され、ここにポリマー液（アクリルエマルジョン）を約３ｋｇ添加して樹脂モルタルとする。
この樹脂モルタルは、三井化学製ＴＫ−５００として市販されており、特殊成分接着剤の働きにより高い圧着強度・接着強度を発揮する効果を有しており、鉄分、アルミ等を含まないため、従来の急結材のように早期に剥離・剥落するようなことがなく、止水効果に優れている。
Regarding the reinforcement of concrete corners, the resin mortar to be filled therein is preferably composed of the following composition as an excellent water stop effect of cement water. For example, each blending amount and weight% are shown for an internal volume of 18 kg.
Cement 12.5kg 69.0%
Shirasu 1.0kg 5.5%
Minato 7 No. 4.0kg 22.2%
Soda ash 1.2kg 6.7%
Strong moisture absorbent 0.2kg 0.1%
Ginnan (seaweed) 0.2kg 0.1%
Stone powder 0.5kg 2.7%
The same amount of water is used at a ratio of 1: 1, thereby forming a quick setting material mixed mortar, to which about 3 kg of a polymer liquid (acrylic emulsion) is added to form a resin mortar.
This resin mortar is commercially available as TK-500 manufactured by Mitsui Chemicals, and has the effect of exhibiting high pressure bonding strength and adhesive strength by the action of a special component adhesive, and does not contain iron, aluminum, etc. It does not peel off or peel off as early as the quick setting material, and has an excellent water stop effect.
本発明の他の実施例によれば、人孔内老朽コンクリート構造物の上下壁及び左右側壁に対する補強・補修法は、次のような工程により行われる。
１．コンクリート表面の洗浄、段差、欠損部の修正、レイタンスの除去など下地処理。
２．プライマー、例えば三井化学製ＸＰＳ−３５００をローラで塗布するプライマー塗布。
３．パテ材、例えば同社製Ｌ−５５０による不陸修正。
４．含浸接着剤、例えば同社製エポキシ樹脂ＸＬ−７５０をローラ、刷毛による含浸接着剤の下塗り。
５．炭素繊維シート、例えば同社製リペラーク２０をゴムヘラ、ローラ等で充分に押さえ、目詰・脱泡しながらの炭素繊維シート張付け。
６．同様の含浸接着剤をローラ、刷毛による含浸接着剤の上塗り。
７．表面保護塗膜（仕上げ材）塗布による表面仕上げ。
そして養生させることにより、せん断補強、じん性補強（変形性能の改善）、曲げ補強、疲労耐久性の向上などの効果が得られる。
なお、炭素繊維シートは、炭素繊維を並べてシート状にしたもので、エポキシ樹脂を含浸・硬化させ、補強に効果があり、引張強度は鋼材の約１０倍の強さがあると言われている。
According to another embodiment of the present invention, the reinforcing and repairing method for the upper and lower walls and the left and right side walls of the aging concrete structure in the manhole is performed by the following process.
1. Surface treatment such as cleaning of concrete surface, correction of steps and defects, removal of latency, etc.
2. Primer application for applying a primer such as XPS-3500 manufactured by Mitsui Chemicals with a roller.
3. Non-landscape correction with putty material, for example L-550 made by the company.
4). An undercoat of an impregnating adhesive, such as an epoxy resin XL-750 manufactured by the same company, with a roller or brush.
5. A carbon fiber sheet, for example, a company-made
6). Apply the same impregnation adhesive with a roller and brush.
7). Surface finish by applying surface protective coating (finishing material).
By curing, effects such as shear reinforcement, toughness reinforcement (improvement of deformation performance), bending reinforcement, and fatigue durability can be obtained.
The carbon fiber sheet is a sheet of carbon fibers arranged side by side, impregnated and cured with an epoxy resin, has an effect of reinforcement, and is said to have a tensile strength about 10 times that of steel. .
１０ マンホール ２０ 人孔内コンクリート構造物
２０ｓ 単位断面 ２２ 隅角部
２４，２６ 隣接面 ２２ａ アンカーボルト
２２ｆ 鉄筋 ２２ｒ 樹脂モルタル
２２ｃ 炭素繊維シート
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105386463A (en) * | 2015-12-14 | 2016-03-09 | 北京智华通科技有限公司 | Cement concrete pavement ground well equipment protective device |
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| JP4582771B2 (en) * | 2004-08-04 | 2010-11-17 | 新日鉄マテリアルズ株式会社 | Method for reinforcing concrete structure embedded in the ground and reinforced concrete structure |
| JP4747014B2 (en) * | 2006-03-27 | 2011-08-10 | 株式会社シクソン | Reinforcement structure and method for concrete waterway |
| JP4718409B2 (en) * | 2006-10-11 | 2011-07-06 | 関西電力株式会社 | Manhole reinforcement method |
| JP6254919B2 (en) * | 2014-09-11 | 2017-12-27 | 東京都下水道サービス株式会社 | Repair method for cylindrical concrete structures |
| JP7032646B2 (en) * | 2018-04-13 | 2022-03-09 | 日本電信電話株式会社 | Construction method |
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| CN105386463A (en) * | 2015-12-14 | 2016-03-09 | 北京智华通科技有限公司 | Cement concrete pavement ground well equipment protective device |
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