JP6853864B2 - Mortar or concrete surface peeling prevention method by spraying resin - Google Patents
Mortar or concrete surface peeling prevention method by spraying resin Download PDFInfo
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Description
本発明は、剥落が懸念されるトンネル覆工をはじめ、橋脚、橋桁等にも適用できるモルタル又はコンクリート面の剥落対策工法に関するものである。 The present invention relates to a method for preventing peeling of a mortar or concrete surface, which can be applied to piers, bridge girders, etc., as well as tunnel lining, which may be peeled off.
従来、ひび割れ等の変状があるコンクリート製トンネル覆工に対して、繊維シート等を貼り付け、覆工コンクリートの補強および剥落対策を図る技術は既に開発されている（下記特許文献１参照）。
Conventionally, a technique has already been developed in which a fiber sheet or the like is attached to a concrete tunnel lining that has deformation such as cracks to reinforce the lining concrete and take measures against peeling (see
また、コンクリート構造物であるトンネル全面にプライマー塗装後ポリウレア樹脂を吹き付けて塗膜を形成させることは知られている（下記特許文献２参照）。 Further, it is known that a polyurea resin is sprayed on the entire surface of a tunnel, which is a concrete structure, after coating with a primer to form a coating film (see Patent Document 2 below).
しかしながら、従来のトンネル覆工の剥落対策工法では、繊維を織り込んだシート等をトンネル内面に、一定の面積で貼り付け、コンクリートの剥落塊を全体的に覆うことにより効果を得ていた。この剥落対策工法では、貼付けたシートが経年劣化により剥がれて落下したり、垂れ下がって架線に接触する恐れがある。アンカーで端部を固定した場合でも、アンカーの緩みによりアンカー自体が落下する恐れがあり、アンカーのメンテナンスに多大な労力が必要である。 However, in the conventional tunnel lining anti-stripping method, an effect is obtained by sticking a sheet or the like woven with fibers on the inner surface of the tunnel with a certain area to cover the peeled lumps of concrete as a whole. In this peeling countermeasure method, the attached sheet may peel off due to deterioration over time and fall, or may hang down and come into contact with the overhead wire. Even when the end is fixed with an anchor, the anchor itself may fall due to loosening of the anchor, which requires a great deal of labor for maintenance of the anchor.
また、一般的な剥落対策工法では、覆工内面の変状範囲全面をシートで覆ってしまうため、対策後のコンクリート覆工の変状点検、変状進展の確認は不可能である。 Further, in the general peeling countermeasure construction method, since the entire surface of the deformation of the inner surface of the lining is covered with a sheet, it is impossible to inspect the deformation of the concrete lining after the countermeasure and confirm the progress of the deformation.
また、ひび割れを覆ってしまうので、ひび割れ部から流れ出る漏水が剥落対策工法によってせき止められ、剥落対策工法やトンネル覆工全体に水圧が作用してしまう恐れがある。さらに、繊維シート等により過剰に引張補強を行った場合には、せん断破壊先行型の破壊モードとなってしまう。せん断破壊は、曲げ破壊と比べ、脆性的であるため、せん断破壊先行となることは望ましくない。なお、高強度、高剛性の薄い材料で内面だけに曲げ補強をしても、耐荷性能はあまり改善しないことも実験で確認されており、剥落対策工法は必ずしも高強度、高剛性の材料を使うべきであるとは言えない。 In addition, since the cracks are covered, the water leakage flowing out from the cracked portion is dammed up by the peeling countermeasure method, and there is a risk that water pressure acts on the peeling countermeasure method and the entire tunnel lining. Further, when excessive tensile reinforcement is performed with a fiber sheet or the like, the fracture mode is a shear fracture precedent type. Since shear fracture is more brittle than bending fracture, it is not desirable to precede shear fracture. In addition, it has been confirmed in experiments that the load bearing performance does not improve so much even if only the inner surface is bent and reinforced with a thin material with high strength and high rigidity, and the peeling countermeasure method always uses a material with high strength and high rigidity. It cannot be said that it should be.
従来公知のポリウレア樹脂の塗膜をトンネル全面に形成させた場合、塗膜が垂れ下がったときには、架線に接触したりする不都合が生じる恐れがあった。 When a conventionally known polyurea resin coating film is formed on the entire surface of the tunnel, there is a risk that the coating film may come into contact with the overhead wire when the coating film hangs down.
本発明は、上記状況に鑑みて、剥落対策工の落下や垂れ下がりの心配がなく、剥落対策後のモルタル又はコンクリート面の変状点検、変状進展の確認が容易であり、しかも、剥落対策工の背面に滞水しない、樹脂吹付けによるモルタル又はコンクリート面の剥落対策工法を提供することを目的とする。 In view of the above situation, the present invention does not have to worry about the fall or sagging of the peeling countermeasure work, and it is easy to inspect the deformation of the mortar or concrete surface after the peeling countermeasure and confirm the progress of the deformation, and moreover, the peeling countermeasure work. It is an object of the present invention to provide a method for preventing peeling of a mortar or concrete surface by spraying resin so that water does not stay on the back surface of the concrete.
本発明は、上記目的を達成するために、
〔１〕樹脂吹付けによるモルタル又はコンクリート面の剥落対策工法であって、モルタル又はコンクリート面にプライマーを塗布し、ゼブラ配置でポリウレア樹脂を吹付け、前記ゼブラ配置は、ポリウレア樹脂の塗膜が、上下方向にのみ連続して形成された所定の間隔をおいて設けられ、ひび割れが必ずポリウレア樹脂の塗膜を通る配置であることを特徴とする。
In order to achieve the above object, the present invention
[1] A method for preventing peeling of a mortar or concrete surface by spraying resin, in which a primer is applied to the mortar or concrete surface and a polyurea resin is sprayed in a zebra arrangement. provided at predetermined intervals formed continuously only in the vertical direction, wherein the cracking is arranged always Ru through the coating of polyurea resin.
〔２〕上記〔１〕記載の樹脂吹付けによるモルタル又はコンクリート面の剥落対策工法において、前記モルタル又はコンクリート面はトンネル覆工内面であることを特徴とする。 [2] In the method for preventing peeling of a mortar or concrete surface by spraying resin according to the above [1], the mortar or concrete surface is an inner surface of a tunnel lining.
本発明によれば、次のような効果を奏することができる。
（１）吹付けにより大面積のモルタル又はコンクリート面に容易にかつ素早く千鳥配置またはゼブラ配置のポリウレア樹脂の補強パターンを形成することができる。
（２）ポリウレア樹脂は素材自体が軽いため、１枚当たりの吹付け面積を適切に設定することで、落下による列車への影響をなくすことができる。
（３）千鳥配置として、最大長さを短くした場合、垂れ下がり架線へ接触する心配がない。
（４）経年劣化による剥がれの心配が不要なため、アンカーを必要とせず、メンテナンスコストの低い剥落対策工を提供することができる。
（５）補強後のモルタル又はコンクリート面のひび割れ等の変状や変形の進展を目視にて確認できるため、点検性能に優れ、補強背面に滞水しないことが大きな利点となる。
（６）本発明では、劣化により一部のポリウレアが剥がれてきても、その補修を容易に行うことができる。
According to the present invention, the following effects can be obtained.
(1) By spraying, a reinforcing pattern of a polyurea resin in a staggered or zebra arrangement can be easily and quickly formed on a large area mortar or concrete surface.
(2) Since the material itself of polyurea resin is light, it is possible to eliminate the influence on the train due to the fall by appropriately setting the spraying area per sheet.
(3) When the maximum length is shortened as a staggered arrangement, there is no concern that it will come into contact with the hanging overhead wire.
(4) Since there is no need to worry about peeling due to deterioration over time, it is possible to provide a peeling countermeasure work with low maintenance cost without the need for an anchor.
(5) Since it is possible to visually confirm the progress of deformation and deformation of the mortar or concrete surface after reinforcement, it is excellent in inspection performance and it is a great advantage that water does not stay on the back surface of the reinforcement.
(6) In the present invention, even if some polyurea is peeled off due to deterioration, it can be easily repaired.
本発明の樹脂吹付けによるモルタル又はコンクリート面の剥落対策工法は、モルタル又はコンクリート面にプライマーを塗布し、千鳥配置又はゼブラ配置でポリウレア樹脂を吹付ける。 In the method for preventing the mortar or concrete surface from peeling off by spraying the resin of the present invention, a primer is applied to the mortar or concrete surface, and the polyurea resin is sprayed in a staggered arrangement or a zebra arrangement.
本発明において、千鳥配置とはポリウレア樹脂の塗膜が、横方向（水平方向）及び上下方向（鉛直方向）に所定の間隔において設けられており、この間隔は連続しており、相互に連結して網目状を構成しているが、ポリウレア樹脂の塗膜が形成する島の下端は、水平方向に隣り合う塗膜の島の下端とは上下方向の高さは同じではない配置状態をいう。したがって、千鳥配置では、ポリウレア樹脂の塗膜が形成する連続した間隔は、水平方向に一直線となることはない。ポリウレア樹脂の塗膜が形成する島の形状は、通常は四角形であるが、凸状曲線及び／又は凹状曲線で形成されるような不定形であってもよく、また円形もしくは楕円形のような形状をしていてもよい。島状態の好ましい形状は四角形である。 In the present invention, the staggered arrangement means that the polyurea resin coating film is provided at predetermined intervals in the horizontal direction (horizontal direction) and the vertical direction (vertical direction), and the intervals are continuous and connected to each other. However, the lower end of the island formed by the polyurea resin coating film is not the same height in the vertical direction as the lower end of the islands of the coating film adjacent to each other in the horizontal direction. Therefore, in the staggered arrangement, the continuous intervals formed by the polyurea resin coating film are not aligned in the horizontal direction. The shape of the islands formed by the polyurea resin coating is usually quadrangular, but may be irregular such as formed by a convex curve and / or a concave curve, and may be circular or elliptical. It may have a shape. The preferred shape of the island state is a quadrangle.
また、本発明のゼブラ配置とは、上記ポリウレア樹脂の塗膜の間隔が一方向（図４の場合は上下方向）にのみ連続して形成されている状態をいう。この場合同間隔はポリウレア樹脂の塗膜との関係においては網目状を構成してはいない。いずれにしても、本発明ではポリウレア樹脂の塗膜は、連続した所定の間隔をおいて設けられていることが特徴である。 Further, the zebra arrangement of the present invention means a state in which the distance between the coating films of the polyurea resin is continuously formed only in one direction (vertical direction in the case of FIG. 4). In this case, the same interval does not form a mesh in relation to the coating film of the polyurea resin. In any case, the present invention is characterized in that the polyurea resin coating films are provided at continuous predetermined intervals.
以下、本発明の実施の形態について詳細に説明する。 Hereinafter, embodiments of the present invention will be described in detail.
図１は本発明の実施例を示す樹脂吹付けによるモルタル又はコンクリート面の剥落対策工法の模式図である。 FIG. 1 is a schematic view of a method for preventing peeling of a mortar or concrete surface by spraying a resin, which shows an embodiment of the present invention.
この図において、１はトンネル、２はトンネル覆工、３はモルタル又はコンクリート面、４はひび割れ、５は吹付けられた千鳥配置のポリウレア樹脂である。例えば、トンネル覆工の場合、土圧によるひび割れは基本的にトンネル延長方向に水平に伸びるが、本発明では、ポリウレア樹脂を千鳥配置としていることで、必ずひび割れがポリウレア樹脂５を通ることとなる。覆工の剥落は、目地や潜在的なひび割れ、外力的なひび割れ等が閉合して発生することが一般的であるため、これらのひび割れが千鳥配置のポリウレア樹脂を全て避けることは考えにくく、十分な剥落対策効果を有している（後述するゼブラ配置も同様である）。 In this figure, 1 is a tunnel, 2 is a tunnel lining, 3 is a mortar or concrete surface, 4 is a crack, and 5 is a sprayed staggered polyurea resin. For example, in the case of tunnel lining, cracks due to earth pressure basically extend horizontally in the tunnel extension direction, but in the present invention, the polyurea resin is arranged in a staggered arrangement, so that the cracks always pass through the polyurea resin 5. .. Since the lining is generally peeled off by closing joints, potential cracks, external cracks, etc., it is unlikely that these cracks will avoid all the staggered polyurea resin, which is sufficient. It has a good anti-stripping effect (the same applies to the zebra arrangement described later).
ポリウレア樹脂は剛性が小さく伸び性能が大きいため、標準設計厚さ (１．５ｍｍ) の吹付けを行った場合は過度の引張補強にはならず、大きな変形にも追随するため、変形を目視にて確認できる。 Since polyurea resin has low rigidity and high elongation performance, it does not become excessive tensile reinforcement when sprayed with the standard design thickness (1.5 mm), and it follows large deformation, so the deformation can be visually checked. Can be confirmed.
さらに、補強後のひび割れ等の変状の進展をポリウレア樹脂の離間において目視にて確認できるため点検性能に優れ、内面補強工の背面に滞水しないことが大きな利点と考えられる。 Furthermore, since the progress of deformation such as cracks after reinforcement can be visually confirmed at the distance of the polyurea resin, it is considered to be excellent in inspection performance and it is considered to be a great advantage that water does not stay on the back surface of the inner surface reinforcement work.
図２は本発明の実施例を示す千鳥配置のポリウレア樹脂形成を示す図面代用写真、図３は本発明の実施例を示す千鳥配置のポリウレア樹脂形成後の図面代用写真である。 FIG. 2 is a drawing-substituting photograph showing the formation of a staggered polyurea resin showing an embodiment of the present invention, and FIG. 3 is a drawing-substituting photograph showing an embodiment of the present invention after forming a staggered polyurea resin.
図２において、１１はポリウレア樹脂の離間箇所形成のためのバッカー、１２はポリウレア樹脂の形成箇所である。 In FIG. 2, 11 is a backer for forming a separation portion of the polyurea resin, and 12 is a formation location of the polyurea resin.
図３において、２１はトンネル覆工、２２は吹付けられた千鳥配置のポリウレア樹脂である。 In FIG. 3, 21 is a tunnel lining and 22 is a sprayed staggered polyurea resin.
欠損部（ポリウレア樹脂を吹付けない部分）には覆工と縁切りできるバッカー１１を設置してからポリウレア樹脂２２を吹付けることにより、容易に大面積のモルタル又はコンクリート面に対して素早く、図３のような千鳥の補強パターンを形成できる（後述するゼブラ配置も同様である）。なお、図示されてはいないが、ポリウレア樹脂の吹き付けの前に、モルタル又はコンクリート面にプライマーを塗布している。
By installing a
ポリウレア樹脂の塗膜の間隔は、５ｍｍ〜１００ｍｍ程度であって、好ましくは１０ｍｍ〜５０ｍｍである。 The distance between the coating films of the polyurea resin is about 5 mm to 100 mm, preferably 10 mm to 50 mm.
本発明では、千鳥配置の場合、ポリウレア樹脂１枚当たりのサイズは、幅が１００ｍｍ以下、好ましくは１００ｍｍ〜５０ｍｍ、長さが５００ｍｍ以下、好ましくは５００ｍｍ〜３００ｍｍ、厚さが１．５ｍｍ以下、好ましくは１．５ｍｍ〜１．３ｍｍであることが望ましい。即ち最大で幅１００ｍｍ×長さ５００ｍｍ×厚さ１．５ｍｍであることが望ましい。 In the present invention, in the case of the staggered arrangement, the size of one polyurea resin is 100 mm or less in width, preferably 100 mm to 50 mm, length is 500 mm or less, preferably 500 mm to 300 mm, and thickness is 1.5 mm or less, preferably 1.5 mm or less. Is preferably 1.5 mm to 1.3 mm. That is, it is desirable that the maximum width is 100 mm, the length is 500 mm, and the thickness is 1.5 mm.
また、ポリウレア樹脂の吹付量としては、１．５ｋｇ/ ｍ2 以下、好ましくは１．５〜１．３ｋｇ/ ｍ2 であることが望ましい。吹付量が１．５ｋｇ/ ｍ2 の場合、ポリウレア樹脂１枚当たりの重量は７５ｇとなるので、１枚当たりの重量は７５ｇ以下、好ましくは７５ｇ〜６５ｇ程度が好ましい。 As the spray amount of polyurea resin, 1.5 kg / m 2 or less, preferably a 1.5~1.3kg / m 2. When the spraying amount is 1.5 kg / m 2 , the weight per polyurea resin is 75 g. Therefore, the weight per sheet is 75 g or less, preferably about 75 g to 65 g.
ポリウレア樹脂は素材自体が軽く、１枚あたりの吹付け面積を、例えば上記の値に適切に設定することにより、万が一落下しても列車に影響はない。さらに、千鳥配置として、最大長さを短くした場合には、垂れ下がり架線に接触することもない。経年劣化による剥がれの心配が不要なため、アンカーを必要とせずに、剥落対策工としてのメンテナンスコストが低くなるように構成することができる。 The material itself of polyurea resin is light, and by setting the sprayed area per sheet appropriately to the above values, for example, even if it falls, it will not affect the train. Furthermore, when the maximum length is shortened as a staggered arrangement, it does not come into contact with the hanging overhead wire. Since there is no need to worry about peeling due to deterioration over time, it can be configured so that the maintenance cost as a peeling countermeasure work is low without the need for an anchor.
図４は本発明の他の実施例を示す樹脂吹付けによるモルタル又はコンクリート面の剥落対策工法の模式図である。 FIG. 4 is a schematic view of a method for preventing peeling of a mortar or concrete surface by spraying a resin, which shows another embodiment of the present invention.
この図において、３１はトンネル、３２はトンネル覆工、３３はモルタル又はコンクリート面、３４はひび割れ、３５は吹付けられたゼブラ配置のポリウレア樹脂である。 In this figure, 31 is a tunnel, 32 is a tunnel lining, 33 is a mortar or concrete surface, 34 is a crack, and 35 is a sprayed zebra-arranged polyurea resin.
この実施例では千鳥配置に代えてゼブラ配置のポリウレア樹脂を配置する。 In this embodiment, a zebra-arranged polyurea resin is arranged instead of the staggered arrangement.
図１と同様に、トンネル延長方向に水平に伸びるひび割れが、必ずポリウレア樹脂を通ることとなり、十分な剥落対策効果を奏することができる。 Similar to FIG. 1, the cracks extending horizontally in the tunnel extension direction always pass through the polyurea resin, and a sufficient effect of preventing peeling can be obtained.
上記実施例では、トンネル覆工を例とした実施例を示したが、本発明の樹脂吹付けによるモルタル又はコンクリート面の剥落対策工法は、橋脚、橋桁等、モルタル又はコンクリート面を有する他の構造物にも適用可能である。 In the above embodiment, an example is shown in which tunnel lining is used as an example, but the method for preventing peeling of a mortar or concrete surface by spraying resin of the present invention includes other structures having a mortar or concrete surface such as piers and bridge girders. It can also be applied to things.
なお、本発明は上記実施例に限定されるものではなく、本発明の趣旨に基づき種々の変形が可能であり、これらを本発明の範囲から排除するものではない。 The present invention is not limited to the above examples, and various modifications can be made based on the gist of the present invention, and these are not excluded from the scope of the present invention.
本発明の樹脂吹付けによるモルタル又はコンクリート面の剥落対策工法は、アンカーを必要とせず、剥落対策後のモルタル又はコンクリート覆工の変状点検、変状進展の確認が容易であり、しかも、内面補強工の背面に滞水しない、樹脂吹付けによるモルタル又はコンクリート面の剥落対策工法として利用可能である。 The method for preventing peeling of the mortar or concrete surface by spraying resin of the present invention does not require an anchor, and it is easy to check the deformation of the mortar or concrete lining after the peeling countermeasure and confirm the progress of the deformation, and moreover, the inner surface. It can be used as a method to prevent the mortar or concrete surface from peeling off by spraying resin so that water does not stay on the back of the reinforcement work.
１、３１ トンネル
２、２１、３２ トンネル覆工
３、３３ モルタル又はコンクリート面
４、３４ ひび割れ
５、２２ 千鳥配置のポリウレア樹脂
１１ バッカー
１２ ポリウレア樹脂の形成箇所
３５ ゼブラ配置のポリウレア樹脂
1, 31
Claims (2)
前記ゼブラ配置は、ポリウレア樹脂の塗膜が、上下方向にのみ連続して形成された所定の間隔をおいて設けられ、ひび割れが必ずポリウレア樹脂の塗膜を通る配置であることを特徴とする樹脂吹付けによるモルタル又はコンクリート面の剥落対策工法。 It is a method of preventing the mortar or concrete surface from peeling off by applying a primer to the mortar or concrete surface and spraying polyurea resin in a zebra arrangement.
The Zebra arrangement, the coating film of polyurea resin is provided at a predetermined interval formed continuously only in the vertical direction, wherein the cracking is arranged always Ru through a coating of polyurea resin A method of preventing the peeling of mortar or concrete surface by spraying resin.
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