JP2017160732A - Construction method for taking measure against peeling-off of mortar or concrete surface by spraying resin - Google Patents
Construction method for taking measure against peeling-off of mortar or concrete surface by spraying resin Download PDFInfo
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- 229920005989 resin Polymers 0.000 title claims abstract description 69
- 239000011347 resin Substances 0.000 title claims abstract description 69
- 239000004570 mortar (masonry) Substances 0.000 title claims abstract description 44
- 238000005507 spraying Methods 0.000 title claims abstract description 30
- 238000010276 construction Methods 0.000 title claims abstract description 11
- 229920002396 Polyurea Polymers 0.000 claims abstract description 49
- 238000000034 method Methods 0.000 claims description 22
- 230000002265 prevention Effects 0.000 claims description 17
- 241000283070 Equus zebra Species 0.000 claims description 9
- 230000002787 reinforcement Effects 0.000 abstract description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 4
- 238000007689 inspection Methods 0.000 abstract description 3
- 230000000717 retained effect Effects 0.000 abstract 1
- 238000000576 coating method Methods 0.000 description 12
- 239000011248 coating agent Substances 0.000 description 11
- 230000015572 biosynthetic process Effects 0.000 description 5
- 239000002987 primer (paints) Substances 0.000 description 5
- 230000006866 deterioration Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 239000007921 spray Substances 0.000 description 4
- 238000012423 maintenance Methods 0.000 description 3
- 230000003014 reinforcing effect Effects 0.000 description 3
- 230000032683 aging Effects 0.000 description 2
- 238000005452 bending Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 238000007665 sagging Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000009751 slip forming Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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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 mortar or concrete surface peeling prevention method that can be applied to a bridge lining, a bridge pier, a bridge girder, and the like in which tunnel peeling is a concern.
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 technology for reinforcing a covering concrete and a countermeasure for peeling off has already been developed for a concrete tunnel lining having a deformation such as a crack (see Patent Document 1 below).
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）。
In addition, it is known to form a coating film by spraying a polyurea resin after primer coating on the entire tunnel surface which is a concrete structure (see
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 peeling countermeasure method, an effect is obtained by sticking a sheet or the like woven with fibers on the inner surface of the tunnel in a certain area and covering the concrete peeling lump as a whole. In this anti-peeling method, the attached sheet may be peeled off due to deterioration over time, or may drop and come into contact with an overhead wire. Even when the end portion is fixed by the anchor, the anchor itself may fall due to the looseness of the anchor, and a great deal of labor is required for anchor maintenance.
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。 Moreover, in a general peeling countermeasure construction method, since the entire deformation range on the inner surface of the lining is covered with a sheet, it is impossible to check 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。 Moreover, since the crack is covered, the water leaking out from the cracked portion is blocked by the peeling countermeasure construction method, and there is a possibility that water pressure acts on the peeling countermeasure construction method and the entire tunnel lining. Furthermore, when tensile reinforcement is excessively performed with a fiber sheet or the like, a failure mode of a shear failure preceding type is obtained. Since shear failure is more brittle than bending failure, it is not desirable to precede shear failure. In addition, it has been confirmed by experiment that load resistance performance does not improve much even if bending reinforcement is applied only to the inner surface with a thin material with high strength and high rigidity, and the anti-stripping 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 possibility that inconveniences such as contact with an overhead wire may occur 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 is free from fear of dropping or sagging of the anti-peeling work, easy to check the deformation of the mortar or concrete surface after the anti-peeling action, and confirm the progress of the deformation, The purpose is to provide a mortar or concrete surface peeling prevention method by spraying with resin that does not stagnate on the back of the wall.
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、千鳥配置でポリウレア樹脂を吹付けることを特徴とする。
In order to achieve the above object, the present invention provides
[1] A mortar or concrete surface peeling prevention method by resin spraying, characterized in that a primer is applied to the mortar or concrete surface and polyurea resin is sprayed in a staggered arrangement.
〔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、前記ポリウレア樹脂１枚当たりのサイズを幅１００ｍｍ以下×長さ５００ｍｍ以下×厚さ１．５ｍｍ以下にすることを特徴とする。 [2] In the mortar or concrete surface peeling prevention method by resin spraying as described in [1] above, the size per sheet of the polyurea resin should be 100 mm or less × 500 mm or less × 1.5 mm or less in thickness. It is characterized by.
〔３〕上記〔２〕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、前記ポリウレア樹脂１枚当たりの吹付量を１．５ｋｇ/ ｍ2 以下及び１枚当たりの重量を７５ｇ以下にすることを特徴とする。 [3] In the method for preventing peeling of mortar or concrete surface by resin spraying as described in [2] above, the spraying amount per said polyurea resin is 1.5 kg / m 2 or less and the weight per sheet is 75 g or less It is characterized by doing.
〔４〕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ることを特徴とする。 [4] A mortar or concrete surface peeling prevention method by resin spraying, characterized in that a primer is applied to the mortar or concrete surface and polyurea resin is sprayed in a zebra arrangement.
〔５〕上記〔１〕から〔４〕記載の何れか一項記載の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。 [5] The mortar or concrete surface peeling prevention method according to any one of [1] to [4], wherein the mortar or concrete surface is a tunnel lining inner surface.
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 achieved.
(1) A reinforcing pattern of polyurea resin having a staggered arrangement or a zebra arrangement can be easily and quickly formed on a mortar or concrete surface having a large area by spraying.
(2) Since the material itself of polyurea resin is light, it is possible to eliminate the influence on the train due to falling by appropriately setting the spraying area per sheet.
(3) When the maximum length is shortened as a staggered arrangement, there is no fear of hanging down and contacting the overhead wire.
(4) Since there is no need to worry about peeling due to aging deterioration, an anchor is not required, and it is possible to provide a stripping countermeasure work with a low maintenance cost.
(5) Since deformation and deformation progress such as cracks on the mortar or concrete surface after reinforcement can be visually confirmed, the inspection performance is excellent, and it is a great advantage not to stagnate the back of the reinforcement.
(6) In the present invention, even if some polyurea is peeled off due to deterioration, the repair can be easily performed.
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 mortar or concrete surface peeling prevention method by the resin spraying 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 is that polyurea resin coatings are provided at predetermined intervals in the horizontal direction (horizontal direction) and the vertical direction (vertical direction), and these intervals are continuous and connected to each other. However, the lower end of the island formed by the polyurea resin coating film refers to an arrangement state in which the height in the vertical direction is not the same as the lower end of the coating film island adjacent in the horizontal direction. Therefore, in the staggered arrangement, the continuous intervals formed by the polyurea coating film do not align in the horizontal direction. The shape of the island formed by the polyurea resin coating is usually a quadrangle, but it may be an irregular shape such as a convex curve and / or a concave curve. It may have a shape. A preferable 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。 The zebra arrangement of the present invention refers to a state in which the coating interval of the polyurea resin is continuously formed only in one direction (in the vertical direction in FIG. 4). In this case, the same interval does not constitute a network in relation to the coating film of the polyurea resin. In any case, the present invention is characterized in that the polyurea resin coating film is provided at a predetermined continuous interval.
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 mortar or concrete surface peeling prevention method by resin spraying showing 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, 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. However, in the present invention, since the polyurea resin is arranged in a staggered manner, the cracks always pass through the
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, spraying with a standard design thickness (1.5 mm) does not result in excessive tensile reinforcement, and it follows large deformations. 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 in the separation of the polyurea resin, it is considered that the inspection performance is excellent, and it is considered to be a great advantage that water does not stagnate 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 arrangement of polyurea resins showing an embodiment of the present invention, and FIG. 3 is a drawing-substituting photograph after the formation of a staggered arrangement of polyurea resins showing an embodiment of the present invention.
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,
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 polyurea resin in a staggered arrangement.
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 the
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 interval 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 staggered arrangement, the size of one polyurea resin is 100 mm or less in width, preferably 100 mm to 50 mm, 500 mm or less in length, preferably 500 mm to 300 mm, and 1.5 mm or less in thickness. Is preferably 1.5 mm to 1.3 mm. That is, it is desirable that the maximum width is 100 mm × length 500 mm × thickness 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 sheet of polyurea resin is 75 g, so the weight per sheet is 75 g or less, preferably about 75 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 polyurea resin is light in material itself, and by setting the spraying area per sheet appropriately to the above value, for example, the train will not be affected even if it falls. Furthermore, when the maximum length is shortened as a staggered arrangement, it does not come into contact with the hanging overhead line. Since there is no need to worry about peeling due to aging deterioration, the anchor can be used without requiring an anchor, and the maintenance cost as a countermeasure against peeling can be reduced.
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 mortar or concrete surface peeling prevention method by resin spraying showing 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, instead of the staggered arrangement, a polyurea resin having a zebra arrangement is arranged.
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。 As in FIG. 1, cracks extending horizontally in the tunnel extension direction always pass through the polyurea resin, so that a sufficient anti-peeling effect can be achieved.
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 of tunnel lining was shown, but the mortar or concrete surface peeling prevention method by resin spraying according to the present invention is another structure having a mortar or concrete surface such as a bridge pier and a bridge girder. Applicable to objects.
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。 In addition, this invention is not limited to the said Example, Based on the meaning of this invention, a various deformation | transformation is possible 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 mortar or concrete surface peeling prevention method by the resin spray of the present invention does not require an anchor, it is easy to check the deformation of the mortar or concrete lining after the peeling prevention, and check the progress of deformation, and the inner surface. It can be used as a mortar or concrete surface peeling prevention method by resin spraying that does not stagnate 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
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