JP2014034838A - Slip prevention method of extension/contraction device for bridge and slip prevention structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a slip prevention method of an extension/contraction device for a bridge with which, regarding problems a conventional slip prevention material has, a slip prevention performance can be presented for a long time by improving immunity to traveling by a vehicle, and a slip prevention structure.SOLUTION: According to a slip prevention method of an extension/contraction device for a bridge, a surface of the extension/contraction device for the bridge is coated with a reactive curing acrylic resin containing phosphoric acid (meta-)acrylate as a primer by 20 to 500 g/mand then resin mortar obtained by mixing the reactive curing acrylic resin, an inorganic material of which the Mohs hardness is 8 or more and an aggregate containing inorganic powder of which the Mohs hardness is 7 or less is applied by 0.5 to 10 kg/mand hardened to form a surface layer. In the slip prevention method of the extension/contraction device for the bridge, the reactive curing acrylic resin containing phosphoric acid (meta-)acrylate contains: (A) monofunctional (meta-)acrylate and polyfunctional (meta-)acrylate; (B) polymerization initiator; (C) decomposition accelerator; and (D) phosphoric (meta-)acrylate.

Description

  The present invention relates to a slip prevention method and a slip prevention structure for a bridge extension device installed at a joint of a road bridge.

In general, in an elevated road such as an expressway or a road bridge, a metal expansion / contraction device is provided for each predetermined distance in order to cope with expansion / contraction due to a change in temperature and stress due to vibration.
Moreover, the metal expansion-contraction apparatus is installed in the connection part long in a bridge axis direction like the junction part of a highway.
In this way, the bridge expansion and contraction device installed at the joint of the road bridge is made of a metal such as aluminum alloy, steel, and casting, and the surface is smoothed by wear of the bridge expansion and contraction device during vehicle passage, In particular, there is a problem that the slip resistance value is lowered in a wet state, and slipping easily occurs.

As a countermeasure for preventing slip of metal members installed on the road surface, a main agent containing a reactive oligomer having an unsaturated group in the molecule and an ethylenically unsaturated monomer having a (meth) acryloyl group having a molecular weight of 160 or more. A two-part curable resin composition in which 5 parts by weight of an organic peroxide as a curing agent is added to 100 parts by weight at a temperature of 25 ° C. and the organic peroxide dissolves in the main agent within 60 seconds when stirred. A resin-based non-slip pavement material and a road construction method in which the aggregate is sprayed after the resin-type non-slip pavement material is applied to the road surface have been proposed (Patent Document 1).
However, this resin-based non-slip pavement material is used for a road construction method in which aggregate is applied after being applied to the road surface. Patent Document 1 discloses that a bridge expansion and contraction device is prevented from slipping. In addition, there is no description at all about using a reaction-curable acrylic resin containing phosphoric acid (meth) acrylate.

In addition, as an anti-slip measure for the expansion and contraction device for bridges, it is an anti-slip material laid on the base that constitutes the road surface, and a reaction-curable matrix resin that adheres friction element particles is substantially evenly applied to the base surface. Applying and laminating the friction element particles almost uniformly on the matrix resin, and applying pressure to the dispersed friction element particles, the friction element particles are press-fitted into the matrix resin, and then the matrix resin is cured. By applying the matrix resin to the base friction element particle layer and the lower friction element particle layer formed by fixing the friction element particles by reacting and eliminating the free friction element particles, the matrix resin The friction element particles are dispersed and laminated almost uniformly on the matrix, and the dispersed friction element particles are subjected to rolling pressure to form a matrix. Friction element particles were press-fitted into the fat, and then the matrix resin was cured to fix the friction element particles, and the upper friction element particle layer was formed by eliminating the free friction element particles. An anti-slip material or the like has been proposed (Patent Document 2).
However, this anti-slip measure is to apply a reactive curable matrix resin to the laying base that constitutes the road surface, spray friction element particles on it, apply rolling pressure to the dispersed friction element particles, and apply the matrix resin to the matrix resin. An anti-slip material obtained by press-fitting friction element particles and curing a matrix resin. Patent Document 2 completely describes the use of a resin mortar in which a reaction-curing acrylic resin and an aggregate are mixed. Not.

On the other hand, an adhesive composition comprising a (meth) acrylic acid ester monomer, cumene hydroperoxide, cobalt soap, a nitrogen-containing compound, and phosphoric acid (meth) acrylate as an adhesive capable of bonding metal and concrete has been proposed. (Patent Document 3).
However, Patent Document 3 does not describe at all about applying a resin mortar containing an adhesive composition and an aggregate to the surface of a metal member and making it an anti-slip measure.

JP 2008-156839 A JP 2009-062678 A JP 2006-180661 A

  In view of the problems of the conventional anti-slip material, the present invention provides an anti-slip method and an anti-slip method for a bridge expansion / contraction device capable of improving running durability by a vehicle and exhibiting anti-slip performance over a long period of time. An object is to provide a prevention structure.

The present invention employs the following means in order to solve the above problems.
(1) Applying 20-500 g / m ^{2 on} the surface of a bridge expansion / contraction device using a reactive curable acrylic resin containing phosphoric acid (meth) acrylate as a primer, then a reactive curable acrylic resin and a Mohs hardness of 8 or more Anti-slip of the expansion and contraction device for bridge formed by applying 0.5 ~ 10kg / m ^{2 of} resin mortar, which is a mixture of inorganic material and aggregate containing inorganic powder with Mohs hardness of 7 or less, and curing to form a surface layer Is the method.
(2) On the surface of the bridge expansion and contraction device, a reaction hardening type acrylic resin containing phosphoric acid (meth) acrylate, an inorganic material having a Mohs hardness of 8 or more and an aggregate containing an inorganic powder of a Mohs hardness of 7 or less are mixed. This is a slip prevention method for a bridge expansion and contraction device in which 0.5 to 10 kg / m ^{2 of} resin mortar is applied and cured to form a surface layer.
(3) The reaction-curable acrylic resin containing phosphoric acid (meth) acrylate is (i) a monofunctional (meth) acrylate and a polyfunctional (meth) acrylate, (b) a polymerization initiator, and (c) a decomposition accelerator. And (d) the anti-slip method of the bridge expansion and contraction device according to (1) or (2), which contains phosphoric acid (meth) acrylate.
(4) In the reaction-curable acrylic resin containing the phosphoric acid (meth) acrylate, (i) at least one of a monofunctional (meth) acrylate and a polyfunctional (meth) acrylate is not adjacent to a carbonyl group in one molecule. (Meth) acrylate having an ethylenically unsaturated double bond, (b) cumene hydroperoxide as a polymerization initiator, (c) organometallic salt as a decomposition accelerator, (d) phosphoric acid (meth) acrylate, and (e (2) The slip prevention method for a bridge expansion and contraction device according to (3) above, which contains an imidazole derivative compound.
(5) The reaction curable acrylic resin comprises (i) a monofunctional (meth) acrylate and a polyfunctional (meth) acrylate, (b) a polymerization initiator, and (c) a decomposition accelerator. This is a slip prevention method for a bridge telescopic device.
(6) The inorganic material having a Mohs hardness of 8 or more is a particle mainly composed of alumina having an average particle diameter of 50 to 1,200 μm, and the inorganic powder having a Mohs hardness of 7 or less has an average particle diameter of 30 μm or less. This is the slip prevention method for one of the bridge expansion / contraction devices of the above (1) to (5), which is 0.2 to 30 parts by mass with respect to 100 parts by mass of the inorganic material having a Mohs hardness of 8 or more.
(7) After the resin mortar is cured and fixed to a bridge expansion and contraction device, the inorganic powder is sprayed on the surface of the resin mortar, and the surface uncured component of the resin mortar and the inorganic powder are removed together. It is a slip prevention method of the expansion device for bridges of one of (1) to (6).
(8) on the surface of the bridge for telescopic device, a curable acrylic resin containing phosphoric acid (meth) acrylate, was 20 to 500 g / m ² coating as a primer, a curable acrylic resin, a Mohs hardness of 8 or more Anti-slip of the expansion and contraction device for bridge formed by applying 0.5 ~ 10kg / m ^{2 of} resin mortar, which is a mixture of inorganic material and aggregate containing inorganic powder with Mohs hardness of 7 or less, and curing to form a surface layer Structure.
(9) On the surface of the bridge expansion and contraction device, a reaction-curing acrylic resin containing phosphoric acid (meth) acrylate, an inorganic material having a Mohs hardness of 8 or more, and an aggregate containing an inorganic powder having a Mohs hardness of 7 or less are mixed. An anti-slip structure for a bridge expansion and contraction device formed by applying 0.5 to 10 kg / m ^{2 of} resin mortar and curing to form a surface layer.

  The anti-slip method and anti-slip structure for a bridge extension / contraction device of the present invention can be applied in a short time, and the adhesion durability between the bridge extension / contraction device and the resin mortar and the holding durability of the aggregate in the resin mortar are remarkably improved. In addition, workability such as coating and curing can be improved, and running durability and anti-slip performance can be exhibited over a long period of time.

FIG. 1 is a top view showing an example of a steel telescopic device.

FIG. 2 is a construction example of the steel bridge telescopic device according to the present invention, and is a cross-sectional view taken along the line a-a ′ of FIG. 1.

Hereinafter, the present invention will be described in detail.
In addition, unless otherwise indicated, the part and% in this invention are shown by a mass reference | standard.

In the present invention, a reaction-curable acrylic resin is used to prevent the vehicle from slipping on the surface of the bridge extension / contraction device.
In particular, in the present invention, a reactive curable acrylic resin containing phosphoric acid (meth) acrylate is used from the viewpoint of adhesion to metal.

The reactive curable acrylic resin containing phosphoric acid (meth) acrylate used in the present invention includes (a) monofunctional (meth) acrylate and polyfunctional (meth) acrylate (hereinafter referred to as (i) component), (b) ) Polymerization initiator (hereinafter referred to as (B) component), (C) decomposition accelerator (hereinafter referred to as (C) component), and (D) phosphoric acid (meth) acrylate (hereinafter referred to as (D) component), Alternatively, they further contain (e) an imidazole derivative compound (hereinafter referred to as (e) component).
Here, the monofunctional (meth) acrylate refers to a compound having one (meth) acryloyl group in one molecule. Moreover, polyfunctional (meth) acrylate means the compound which has 2 or more of (meth) acryloyl groups in 1 molecule.

  In addition, the reaction-curable acrylic resin used in the present invention is (a) component monofunctional (meth) acrylate and polyfunctional (meth) acrylate, (b) component polymerization initiator, and (c) component decomposition. The accelerator further contains an imidazole derivative compound as a component (e).

  The (a) component monofunctional (meth) acrylate and polyfunctional (meth) acrylate contained in the reaction-curable acrylic resin used in the present invention are the (a) component monofunctional (meth) acrylate and polyfunctional (meth). At least one of the acrylates is preferably a (meth) acrylate having an ethylenically unsaturated double bond that is not adjacent to the carbonyl group in one molecule.

  For example, the monofunctional (meth) acrylate having no ethylenically unsaturated double bond that is not adjacent to the carbonyl group in one molecule of the component (a) used in the present invention includes methyl (meth) acrylate and ethyl (meth). Acrylate, propyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, isooctyl (meth) acrylate, isodecyl (meth) acrylate, lauryl (meth) acrylate, stearyl (meth) acrylate, phenyl (meth) acrylate, cyclohexyl (meth) Acrylate, dicyclopentanyl (meth) acrylate, isobornyl (meth) acrylate, methoxylated cyclodecatriene (meth) acrylate, 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, -Hydroxypropyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate, polyethylene glycol mono (meth) acrylate, polypropylene glycol mono (meth) acrylate, alkyloxypolypropylene mono (meth) acrylate, phenoxy polyethylene glycol mono (meth) acrylate , Phenoxy polypropylene glycol mono (meth) acrylate, tetrahydrofurfuryl (meth) acrylate, 2-hydroxy-3-phenoxypropyl (meth) acrylate, glycidyl (meth) acrylate, caprolactone modified tetrahydrofurfuryl (meth) acrylate, 3-chloro 2-hydroxypropyl (meth) acrylate, N, N-dimethylaminoethyl (meth) acrylate, N, N Diethylaminoethyl (meth) acrylate, t-butylaminoethyl (meth) acrylate, morpholine (meth) acrylate, ethoxycarbonylmethyl (meth) acrylate, ethylene oxide modified succinic acid (meth) acrylate, ethylene oxide modified phthalic acid (meth) acrylate, tetra Examples include fluoropropyl (meth) acrylate and 2-hydroxy-3- (meth) acryloyloxypropyltrimethylammonium chloride.

Examples of the monofunctional (meth) acrylate having an ethylenically unsaturated double bond that is not adjacent to the carbonyl group in one molecule of the component (a) used in the present invention include dicyclopentenyloxyethyl (meth) acrylate.
By using a monofunctional (meth) acrylate having an ethylenically unsaturated double bond that is not adjacent to the carbonyl group in one molecule, the adhesion between the resin and the aggregate in the resin mortar is improved, and running durability and slip prevention are improved. Performance can be demonstrated over a long period of time.

  In addition, polyfunctional (meth) acrylates having no ethylenically unsaturated double bond that is not adjacent to the carbonyl group in one molecule of component (a) used in the present invention include polyethylene glycol di (meth) acrylate, polyglycerol Di (meth) acrylate, polypropylene glycol di (meth) acrylate, polybutylene glycol di (meth) acrylate, 1,4-butanediol di (meth) acrylate, 1,6-hexanediol di (meth) acrylate, neopentyl glycol Di (meth) acrylate, trimethylolpropane tri (meth) acrylate, pentaerythritol tetra (meth) acrylate, dipentaerythritol hexa (meth) acrylate, tris (meth) acryloyloxyethyl isocyanurate, 2,2- (4- (meth) acryloxyphenyl) propane, 2,2-bis (4- (meth) acryloxyethoxyphenyl) propane, 2,2-bis (4- (meth) acryloxydiethoxyphenyl) propane, Examples include 2,2-bis (4- (meth) acryloxypropoxyphenyl) propane, 2,2-bis (4- (meth) acryloxytetraethoxyphenyl) propane, and epoxy (meth) acrylate. Of these, epoxy (meth) acrylate is most preferred. Examples of the epoxy (meth) acrylate include “Biscoat # 540” (acrylic acid adduct of bisphenol A diglycidyl ether, Osaka Organic Chemical).

The polyfunctional (meth) acrylate having an ethylenically unsaturated double bond that is not adjacent to the carbonyl group in one molecule of the component (A) used in the present invention includes methacryl-modified liquid polybutadiene at both ends and acryl-modified liquid polyacrylonitrile at both ends. Examples thereof include butadiene, methacryl-modified liquid partially hydrogenated polybutadiene at both ends, and acrylic resin-modified liquid polybutadiene at both ends.
Specifically, “TE-2000” (manufactured by Nippon Soda Co., Ltd.) is used as the methacrylic modified liquid polybutadiene at both ends, and “HycarVTBNX” (manufactured by Ube Industries) is used as the acrylic resin at both ends. Examples of the modified liquid polybutadiene include “BAC-45” (manufactured by Osaka Organic Chemical Co., Ltd.) and “TEA-1000” (manufactured by Nippon Soda Co., Ltd.).
By using a polyfunctional (meth) acrylate having an ethylenically unsaturated double bond that is not adjacent to the carbonyl group in one molecule, the adhesion between the resin and the aggregate in the resin mortar is improved, and the running durability and slip prevention are improved. Performance can be demonstrated over a long period of time.

In the present invention, it is preferable to use a monofunctional (meth) acrylate and a polyfunctional (meth) acrylate in combination. When monofunctional (meth) acrylate and polyfunctional (meth) acrylate are used in combination, the content ratio of monofunctional (meth) acrylate and polyfunctional (meth) acrylate is the ratio of monofunctional (meth) acrylate and polyfunctional (meth) acrylate. In a total of 100 parts, by mass ratio, monofunctional (meth) acrylate: polyfunctional (meth) acrylate = 10 to 95 parts: 90 to 5 parts are preferable, and 50 to 90 parts: 50 to 10 parts are more preferable.
The content ratio of the monofunctional (meth) acrylate having an ethylenically unsaturated double bond not adjacent to the carbonyl group in one molecule is preferably 50 parts or more in 100 parts of all monofunctional (meth) acrylates.
The content ratio of the polyfunctional (meth) acrylate having an ethylenically unsaturated double bond not adjacent to the carbonyl group in one molecule is preferably 50 parts or more in 100 parts of all polyfunctional (meth) acrylates.

  The polymerization initiator of the component (b) used in the present invention has a function of a so-called radical polymerization initiator, for example, organic peroxides such as ketone peroxides, peroxyketals, and hydroperoxides, From the viewpoint of curability, hydroperoxides are more preferable.

  Examples of the hydroperoxides include tertiary butyl hydroperoxide, cumene hydroperoxide, diisopropylbenzene hydroperoxide, parameter hydroperoxide, 2,5-dimethylhexane-2,5-dihydroperoxide, and Examples include 1,1,3,3-tetramethylbutyl hydroperoxide, and among these, cumene hydroperoxide is most preferable.

  The amount of the component (b) polymerization initiator used is preferably 0.2 to 10 parts, more preferably 0.5 to 5 parts, based on 100 parts of the total amount of component (a). If it is less than 0.2 part, the curing is slow, and if it exceeds 10 part, the curing rate and the like are not improved, but rather the adhesiveness may be lowered.

  The component (c) decomposition accelerator used in the present invention is a compound that accelerates the decomposition of the polymerization initiator, and examples thereof include the following.

  (1) Thiourea derivatives: diethylthiourea, dibutylthiourea, ethylenethiourea, tetramethylthiourea, mercaptobenzimidazole, benzoylthiourea and the like.

  (2) Amines: N, N-diethyl-p-toluidine, N, N-dimethyl-p-toluidine, N, N-diisopropanol-p-toluidine, triethylamine, tripropylamine, ethyldiethanolamine, N, N- Dimethylaniline, ethylenediamine, triethanolamine, and aldehyde-amine condensation reaction products.

  (3) Organometallic salt: cobalt naphthenate, copper naphthenate, zinc naphthenate, cobalt octylate, copper octylate, zinc octylate and the like.

  (4) Organometallic chelates: copper acetylacetonate, titanium acetylacetonate, manganese acetylacetonate, chromium acetylacetonate, iron acetylacetonate, vanadyl acetylacetonate, cobalt acetylacetonate, and the like. These 1 type, or 2 or more types can be used.

  Among these, organometallic salts and / or organometallic chelates are preferable, organometallic salts are more preferable, and cobalt octylate is most preferable in terms of impregnation properties, adhesiveness, and curability.

  The amount of component (c) used is preferably 0.1 to 10 parts, more preferably 0.3 to 5 parts, based on 100 parts of component (a). If it is less than 0.1 part, curing will be slow, and if it exceeds 10 parts, the curing rate will not be improved, but rather impregnation and adhesion may be deteriorated.

  Examples of the phosphoric acid (meth) acrylate used in the present invention include acid phosphooxyethyl (meth) acrylate, acid phosphooxypropyl (meth) acrylate, and bis (2- (meth) acryloyloxyethyl) phosphate. As well as these amine salts and the like.

  The component (d) phosphoric acid (meth) acrylate has the effect of improving the metal adhesion, and its use amount is preferably 0.05 to 2 parts, and 0.1 to 0.5 parts with respect to 100 parts in total of the component (a). More preferred. If it is less than 0.05 part, the metal adhesion is inferior, and if it exceeds 2 parts, the metal adhesion is not improved, but rather a decrease in curability may occur.

  Examples of the imidazole derivative compound of the component (e) used in the present invention include imidazole, 2-methylimidazole, 2-ethylimidazole, 2-undecylimidazole, 2-heptadecylimidazole, 2-ethyl-4-methylimidazole, 2-phenylimidazole, 2-phenyl-4-methylimidazole, 1-benzyl-2-phenylimidazole, 1,2-dimethylimidazole, 1-cyanoethylimidazole, 1-cyanoethyl-2-ethyl-4-methylimidazole, 1- Cyanoethyl-2-undecylimidazole, 1-cyanoethyl-2-phenylimidazole, 2,4-diamino-6- [2′-methylimidazolyl- (1 ′)]-ethyl-s-triazine, 2,4-diamino- 6- [2'-Undecylimidazo Ru- (1 ′)]-ethyl-s-triazine, 2,4-diamino-6- [2′-ethyl-4′-methylimidazolyl- (1 ′)] ethyl-s-triazine, 2-phenylimidazole isocyanur Acid adduct, 2-phenyl-4,5-dihydroxymethylimidazole, 2-phenyl-4-methyl-5-hydroxymethylimidazole, 2,3-dihydro-1H-pyrrolo (1,2-A) benzimidazole, 4 , 4′-methylenebis (2-ethyl-5-methylimidazole), 2-methylimidazoline, 2-phenylimidazoline and the like.

  (C) When the decomposition accelerator of the component is an organometallic salt, the effect of improving the metal adhesion of the phosphoric acid (meth) acrylate of the component (d) is suppressed, but the imidazole derivative compound of the component (e) is suppressed. By making it contain, the improvement effect of the metal adhesiveness of the phosphoric acid (meth) acrylate of (d) component can be maintained.

  The amount of the imidazole derivative compound used as the component (e) is preferably 0.3 mol or more and less than 3 mol, more preferably 1 to 2 mol, per mol of the organometallic salt of the component (c) decomposition accelerator. If it is less than 0.3 mol, the adhesion to metal may be reduced, and if it is 3 mol or more, the surface curability may be reduced.

  The reaction-curable acrylic resin in the present invention is used as a two-component acrylic resin of agent A containing the polymerization initiator of component (b) and agent B containing the decomposition accelerator of component (c). Preferably, when the decomposition accelerator for the component (C) of the agent B is an organic metal salt, the component B preferably contains the imidazole derivative compound of the component (e).

  In the present invention, after the primer is applied, the resin mortar to be applied is not particularly limited as long as it is a reactive curable acrylic resin containing an aggregate, and is a reactive curable type containing phosphoric acid (meth) acrylate. Acrylic resins can also be used, and reactive curable acrylic resins that do not contain phosphoric acid (meth) acrylate can also be used.

  In the present invention, an aggregate containing an inorganic material having a Mohs hardness of 8 or more and an inorganic powder having a Mohs hardness of 7 or less is used as the aggregate.

  Examples of inorganic materials having a Mohs hardness of 8 or more include tungsten carbide, corundum, alumina, silicon carbide, and boron carbide. Corundum mainly composed of alumina preferably has an average particle size of 50 to 1,200 μm. . As commercial products, Fuji Random 20 (average particle size 1,095 μm), Fuji Random 30 (average particle size 650 μm), Fuji Random 46 (average particle size 385 μm), Fuji Random 120 (average particle size 115 μm), and Fuji Random 220 (average) Particle size 64 μm) (manufactured by Fuji Seisakusho).

Examples of inorganic powders having a Mohs hardness of 7 or less in the present invention are those having an average particle size of 30 μm or less, talc powder, calcium carbonate powder, mica powder, marble powder, magnesium oxide powder, silica powder, silica sand, glass powder, The present invention is not limited to these, and commercially available inorganic powder having a Mohs hardness of 7 or less can be used.
The amount of the inorganic powder having a Mohs hardness of 7 or less in the aggregate is preferably 0.3 to 25 parts with respect to 100 parts of the inorganic material having a Mohs hardness of 8 or more from the viewpoint of the workability of application during construction.

  The amount of aggregate used is preferably 300 to 600 parts with respect to 100 parts of reaction-curable acrylic resin from the viewpoint of slip prevention.

The slip prevention method for the bridge expansion and contraction device according to the present invention will be described.
First, the surface of the bridge expansion / contraction device at the slip prevention point is polished. If the surface of the expansion-contraction apparatus for bridges becomes smooth, the method will not be limited and can be sandblasted.
This sandblasting is a kind of polishing process, and when the bridge expansion and contraction device is new, it removes the resin coating for rust prevention and expands and contracts the bridge to improve the adhesion of the primer and resin mortar. If the upper surface of the device is scratched and the expansion device for the bridge has already been used, rust, dirt, oils and fats, mud, asphalt pieces, etc. attached to the upper surface of the expansion device for the bridge In addition to removing foreign substances and the like, fine scratches are made on the upper surface of the bridge extension device so as to improve the adhesion of the primer in the next step.

  Then, as a primer, a reactive curable acrylic resin containing phosphoric acid (meth) acrylate is applied to improve the adhesive strength with the metal layer, and a reactive curable acrylic resin (reactive curing not containing phosphoric acid (meth) acrylate) Type resin) or resin mortar using a reaction-curable acrylic resin containing phosphoric acid (meth) acrylate.

  When using a reaction-curing acrylic resin containing phosphoric acid (meth) acrylate, two liquids of agent A containing (b) component polymerization initiator and agent B containing component (c) decomposition accelerator It is preferable to use it as an acrylic resin of the type, but (d) component phosphoric acid (meth) acrylate is preferably blended with agent B, and (c) when the component decomposition accelerator is an organometallic salt, It is preferable to use the imidazole derivative compound of component (e) in combination with agent B.

The coating amount of the curable acrylic resin containing phosphoric acid (meth) acrylate in the present invention the metal surface when used as a primer is preferably 20 to 500 g / m ^2, and more preferably 50 to 300 g / m ² . When the primer coating amount is less than 20 g / m ² , the adhesion durability of the resin mortar formed by mixing the reaction-curing acrylic resin and the aggregate is inferior, and when it exceeds 500 g / m ² , the surface becomes sticky, Workability is reduced.

After applying the primer, a reactive curable acrylic resin or reactive curable acrylic resin containing phosphoric acid (meth) acrylate and a resin mortar made of aggregate are applied.
The coating amount of the resin mortar used in the present invention is 0.5 to 10 kg / m ² , and preferably 1 to 5 kg / m ² . If it is less than 0.5 kg / m ² , the durability of the slip resistance performance is inferior, and if it exceeds 10 kg / m ² , the workability is also deteriorated, and the step difference from the existing asphalt pavement becomes large.

After the resin mortar is applied and the resin mortar is hardened and fixed to the bridge expansion / contraction device, especially when the surface tack remains, spray the inorganic powder and spray the inorganic mortar with the uncured surface of the resin mortar. It is preferred to remove the body together.
The method for removing the surface uncured component of the resin mortar and the dispersed inorganic powder together is not particularly limited, and for example, a plastic wire brush can be used.

  EXAMPLES Next, although an Example and a comparative example demonstrate this invention concretely, this invention is not limited to these.

Experimental example 1
Table 1 shows the resin composition, and Table 2 shows the aggregate composition.
Using the formulations shown in Tables 1 and 2, primers and resin mortar were prepared and applied as shown in Table 3, and adhesion durability and slip resistance performance (BPN value) were evaluated. The results are also shown in Table 3.

<Materials used>
(I) -1 component: isobornyl methacrylate (I) -2 component: 2-hydroxyethyl methacrylate (I) -3 component: dicyclopentenyloxyethyl methacrylate (I) -4 component: epoxy acrylate, commercially available product, bisphenol A diglycidyl ether acrylic acid adduct (A) -5 component: methacryl-modified liquid polybutadiene at both ends, commercial product (B) component: cumene hydroperoxide (C) -1 component: benzoylthiourea (C) -2 component : Cobalt octylate, metal content 8%
(D) Component: Acid phosphooxyethyl methacrylate (e) Component: 2-methylimidazole inorganic material a: Mohs hardness of 8 or more, corundum, average particle size 1,095 μm
Inorganic material b: Mohs hardness of 8 or more, corundum, average particle size of 385 μm
Inorganic material c: Mohs hardness of 8 or more, corundum, average particle size of 65 μm
Inorganic powder d: Mohs hardness of 7 or less, silica sand, average particle size of 1,000 μm
Inorganic powder e: Mohs hardness of 7 or less, silica sand, average particle size of 100 μm
Inorganic powder f: Mohs hardness of 7 or less, calcium carbonate, average particle size of 80 μm
Inorganic powder g: Mohs hardness of 7 or less, silica powder, average particle size of 30 μm

<Test method>
1. Adhesion durability test
After sandblasting a 300x300x5mm SS400 steel plate, apply primer and resin mortar by the prescribed method, and after curing the resin mortar for 24 hours, the resin mortar layer reaches the steel plate in an area of 40x40mm A test specimen for adhesion durability was made by cutting up to 5 mm.
Adhesion is obtained by bonding a 40 x 40 mm steel measuring jig to the resin mortar surface, measuring the maximum bond strength of the resin mortar using the Kenken-type adhesive force measuring device, and dividing by the adhesion area. It was.
Adhesive strength (N / mm ² ) = Maximum adhesion strength (N) ÷ Adhesive area (mm ² )
Initial value: 1 day after application of resin mortar After adhesive load condition: (1 hour immersion in water at 23 ° C for 18 hours → 3 hours in air at -30 ° C → 3 hours in air at 60 ° C), up to 30 cycles Adhesion retention after implementation: Adhesion durability retention was calculated by the following equation.
Retention rate (%) = Adhesive force after 30 cycles of load (N / mm ² ) ÷ Initial adhesive force (N / mm ² ) x 100
2. Slip resistance performance evaluation test
After a 300 × 300 × 5 mm SS400 steel plate was sandblasted, a primer and a resin mortar were applied by a predetermined method, and a resin mortar was cured for 24 hours to obtain a test specimen for evaluating slip resistance performance.
Slip resistance performance is measured using a British pendulum resistance measuring instrument (BPN measuring instrument) according to the Pavement Test Method Handbook, Japan Road Association, and 6-5 pavement slip resistance measurement method. The BPN slip resistance (BPN value) was measured. In the measurement, water is sprayed on the surface of the test piece, the rubber slider at the tip of the pendulum of the measuring instrument is swung down from a predetermined position, and the attenuation due to friction between the slider and the surface of the test piece is read with a scale. The unit of is BPN (British Pundulumu Number).
Abrasion load condition: A specimen for evaluation of slip resistance performance was subjected to accelerated polishing for 180 minutes using a polisher equipped with a wire brush (rotation speed: 180 rpm).
3. Evaluation In the adhesion durability test, an adhesion strength of 5 (N / mm ² ) or more after 30 cycles of adhesion durability load and a retention rate of 80% or more were passed, and in the slip resistance performance evaluation test, the drying conditions and wetness A BPN value of 60 or more in the conditions was accepted.
Here, the dry condition is a state where water is not sprayed on the surface of the test body, and the wet condition is a state where water is sprayed on the surface of the test body.

Experimental example 2
Experiments were carried out in the following procedure using a steel bridge telescopic device (width 1 m, length 3.5 m / 1 lane) laid on a highway viaduct (see FIGS. 1 and 2).
After vacuum sandblasting the surface of a steel bridge expansion and contraction device, as in Experiment No. 7, 100 g / m ² of the resin compound 3 primer was applied as a primer, and after curing for 5 minutes, the composition shown in Experiment No. 7 The resin mortar was uniformly applied using a hammer with an application amount of 2.5 kg / m ² . The resin mortar was cured at a test temperature of 20 ° C. for 40 minutes, but the surface tack remained. By spraying No. 7 silica sand on the surface tack and removing the uncured surface components and No. 7 silica sand using a plastic wire brush, the surface tack disappeared and the road could be opened immediately.
The measured BPN value immediately after construction was 98 under dry conditions and 82 under wet conditions. In addition, the BPN measured value at the same place after operation on the expressway for one year after construction was 87 under dry conditions and 78 under wet conditions, confirming that sufficient slip resistance performance was maintained.

Experimental example 3
Experiments were carried out in the following procedure using a steel bridge telescopic device (width 1 m, length 3.5 m / 1 lane) laid on a highway viaduct (see FIGS. 1 and 2).
After vacuum sandblasting the surface of the steel expansion and contraction device, the resin mortar with the composition shown in Experiment No. 8 was uniformly applied using a hammer at a coating amount of 2.5 kg / m ² as in Experiment No. 8. It was applied to. The resin mortar was cured at a test temperature of 20 ° C. for 40 minutes, but the surface tack remained. By spraying No. 7 silica sand on the surface tack and using a plastic wire brush to remove the surface uncured components and No. 7 silica sand, the surface tack disappeared and the road could be opened immediately.
The measured BPN value immediately after construction was 92 under dry conditions and 80 under wet conditions. In addition, the BPN measured value at the same place after operation on the expressway for one year after construction was 84 under dry conditions and 76 under wet conditions, confirming that sufficient slip resistance performance was maintained.

Experimental Example 4
Experiments were carried out in the following procedure using a steel bridge telescopic device (width 1 m, length 3.5 m / 1 lane) laid on a highway viaduct (see FIGS. 1 and 2).
After vacuum sandblasting the surface of a steel bridge telescopic device, 100g / m ² of resin blend 1 was applied as a primer based on the method of Experiment No. 15, and after curing for 5 minutes, it was shown in Experiment No. 15 The blended resin mortar was uniformly applied with a claws at a coating amount of 2.5 kg / m ² . The resin mortar was cured for 40 minutes at a test temperature of 20 ° C., but the surface remained tacky. By spraying No. 7 silica sand on this surface tack and removing No. 7 silica sand using a plastic wire brush, the surface tack disappeared and the road could be opened immediately.
The measured BPN value immediately after construction was 90 under dry conditions and 80 under wet conditions. In addition, the BPN measurement value at the same place after the highway service for one year after the construction was 75 under dry conditions and 38 under wet conditions, and it was confirmed that sufficient slip resistance performance was not maintained.

  The anti-slip method of the bridge expansion and contraction device according to the present invention can be applied in a short time even on a road in service, and not only can the traffic regulation time be shortened, but the anti-slip structure according to the present invention is long-term. Thus, a sufficient slip resistance performance can be maintained over a long period of time, and accidents due to slip can be prevented in advance.

1 Steel telescopic device 2 Pavement 3 Primer layer (when primer is applied)
4 Resin mortar layer

Claims (9)

After applying 20 to 500 g / m ^{2 of} a reactive curable acrylic resin containing phosphoric acid (meth) acrylate as a primer on the surface of the bridge expansion and contraction device, a reactive curable acrylic resin and an inorganic material with a Mohs hardness of 8 or more A stretchable device for bridges, which is formed by applying 0.5 to 10 kg / m ^{2 of} resin mortar, which is a mixture of mortar and aggregate containing inorganic powder with a Mohs hardness of 7 or less, and curing to form a surface layer Slip prevention method. The surface of the bridge expansion and contraction device is formed by mixing a reactive curable acrylic resin containing phosphoric acid (meth) acrylate, an inorganic material having a Mohs hardness of 8 or more, and an aggregate containing an inorganic powder having a Mohs hardness of 7 or less. A method for preventing slip of a bridge expansion and contraction device, comprising applying a resin mortar of 0.5 to 10 kg / m ² and curing to form a surface layer.   The reaction curable acrylic resin containing the phosphoric acid (meth) acrylate comprises (i) a monofunctional (meth) acrylate and a polyfunctional (meth) acrylate, (b) a polymerization initiator, (c) a decomposition accelerator, and ( (D) The method for preventing slipping of the expansion / contraction device for bridges according to claim 1, comprising phosphoric acid (meth) acrylate.   The reaction-curable acrylic resin containing phosphoric acid (meth) acrylate is an ethylenic resin in which at least one of (i) monofunctional (meth) acrylate and polyfunctional (meth) acrylate is not adjacent to a carbonyl group in one molecule. (Meth) acrylate having saturated double bond, (b) cumene hydroperoxide as polymerization initiator, (c) organometallic salt as decomposition accelerator, (d) phosphoric acid (meth) acrylate, and (e) imidazole derivative The slip-preventing method for a bridge extension / contraction device according to claim 3, comprising a compound.   The reaction-curable acrylic resin contains (a) a monofunctional (meth) acrylate and a polyfunctional (meth) acrylate, (b) a polymerization initiator, and (c) a decomposition accelerator. The slip prevention method of the expansion-contraction apparatus for bridges of description.   The inorganic material having a Mohs hardness of 8 or more is a particle mainly composed of alumina having an average particle diameter of 50 to 1,200 μm, and the inorganic powder having a Mohs hardness of 7 or less has an average particle diameter of 30 μm or less and the Mohs hardness of 8 The slip prevention method for a bridge expansion and contraction device according to any one of claims 1 to 5, wherein the amount is 0.2 to 30 parts by mass with respect to 100 parts by mass of the inorganic material.   After the resin mortar hardens and adheres to a bridge expansion and contraction device, the inorganic powder is sprayed on the surface of the resin mortar, and the surface uncured component of the resin mortar and the inorganic powder are removed together. The slip prevention method of the expansion-contraction apparatus for bridges of any one of Claims 1-6. After applying 20 to 500 g / m ^{2 of} a reactive curable acrylic resin containing phosphoric acid (meth) acrylate as a primer on the surface of the bridge expansion and contraction device, a reactive curable acrylic resin and an inorganic material having a Mohs hardness of 8 or more slips for bridges telescopic device, characterized in that the resin mortar obtained by mixing aggregate 0.5 to 10 / m ² was applied, formed by curing to form a surface layer containing a Mohs hardness of 7 or less of inorganic powder Prevention structure. A resin obtained by mixing a reaction hardening type acrylic resin containing phosphoric acid (meth) acrylate, an aggregate containing an inorganic material having a Mohs hardness of 8 or more and an inorganic powder having a Mohs hardness of 7 or less on the surface of a bridge expansion and contraction device An anti-slip structure for an expansion / contraction device for bridges, which is formed by applying mortar in an amount of 0.5 to 10 kg / m ² and curing to form a surface layer.

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