JP7202265B2 - Water pipe leakage prevention structure and its formation method - Google Patents

Description

TECHNICAL FIELD The present invention relates to a water pipe leakage prevention structure and a method of forming the same.

Viaducts with railroads and roads have water pipes (also called drain pipes) running through them for distributing rainwater or snowmelt water to the outside of the viaducts. Rainwater or the like on the floor slab of the viaduct is sent downward from the viaduct through the water pipe from the floor slab. It is known that the concrete that constitutes the floor slabs of viaducts loses weight over time. Also, due to vibrations caused by passing trains or automobiles, or by natural phenomena such as earthquakes, gaps may occur between the concrete and the water pipes.

Fig. 5 shows a situation in which water leaks through the surface of a water distribution pipe from a gap between a concrete floor slab that constitutes a conventional viaduct and a water pipe installed through the concrete floor slab. The cross-sectional view which demonstrates is shown.

As shown in this figure, if there is a gap 23 between the floor slab 20 and the water pipe 21, which constitutes the viaduct, most of the water W1 from the viaduct passes through the inside 22 of the water pipe 21 and into the viaduct. Although sent downward, part of the water W2 leaks from the gap 23 along the surface of the water pipe 21. - 特許庁Such leakage adversely affects commercial facilities, roads, parking lots or parks located under the viaduct. Also, in winter, if water leaking onto the surface of the water pipe 21 falls as icicles, it endangers people passing under the elevated bridge.

As a method to prevent water leakage on the surface of such water pipes, a sealant made of silicone rubber or a filler such as butyl rubber is filled around the pipe, and a stainless steel sheet is placed on the pipe while pressing the filler from above in the axial direction. There is known a method for fixing a cover made of steel (see, for example, Patent Document 1).

JP-A-11-190491

However, when repairing water pipes to prevent water leakage, the pipe diameter may not be known in advance. Also, in one day, they may move while repairing water pipes with different pipe diameters. Therefore, it is troublesome to prepare a cover that can be used for various pipe diameters.

In addition, it is difficult to firmly close the gap between the water pipe and the floor slab for a long period of time. Such a problem is a common problem that occurs in places other than viaducts, such as buildings such as apartments and schools.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems, and to prevent water leakage along the surface of a water pipe easily, firmly and for a long period of time.

(1) A water pipe leakage prevention structure according to an embodiment of the present invention for achieving the above object comprises a floor slab made of concrete, a water pipe fixed through the floor slab, and the floor slab. A gap between the self-bonding silicone rubber wound around the outer circumference of the water pipe exposed from the floor and the water pipe is covered with a lid to leak out from the gap to the surface of the water pipe. Equipped with a silicone rubber sealant that stops running water,
The silicone rubber sealant adheres to the surface of the self-bonding silicone rubber and the surface of the floor slab on the exposed side of the water pipe to seal the gap along the outer periphery of the water pipe. .
(2) In the water pipe leakage prevention structure according to another embodiment, preferably the floor slab is a constituent member of a viaduct.
(3) In the water pipe leakage prevention structure according to another embodiment, preferably, the water pipe is a processed resin product.
(4) A method for forming a water pipe leakage prevention structure according to an embodiment of the present invention for achieving the above object comprises a floor slab made of concrete, a water pipe fixed through the floor slab, Self-bonding silicone rubber wound around the outer periphery of the water pipe exposed from the floor slab and a gap between the floor slab and the water pipe is covered and the surface of the water pipe is covered from the gap. and a silicone rubber sealing agent that stops leaking water, and the silicone rubber sealing agent adheres to the surface of the self-bonding silicone rubber and the surface of the floor slab on the exposed side of the water pipe. , a method of forming a water pipe leakage prevention structure that seals the gap along the outer periphery of the water pipe, a method of forming a water pipe leakage prevention structure using the floor slab as a constituent member of a viaduct, and This is a method of forming a water pipe leakage prevention structure in which a water pipe is a resin-processed product.
The method for forming the water pipe leakage prevention structure includes a winding step of winding a self-adhesive silicone rubber tape around the outer periphery of the water pipe exposed from the concrete floor slab;
a bonding step of bonding a semi-cured adhesive silicone rubber composition to the surface of the self-bonding silicone rubber and the surface of the floor slab on the exposed side of the water pipe;
and a curing step of curing the semi-cured adhesive silicone rubber composition to seal the gap.
(5) In the method for forming a water pipe leakage prevention structure according to another embodiment, preferably, prior to the bonding step, the surface of the floor slab on the exposed side of the water pipe is subjected to keren treatment and/or including the step of applying a primer to the

Advantageous Effects of Invention According to the present invention, it is possible to easily, firmly and for a long time prevent water leakage along the surface of a water pipe.

FIG. 1 shows a partial side view of a water pipe leakage prevention structure according to an embodiment of the present invention and an enlarged view of a part P in the side view. FIG. 2 shows a fragmented cross-sectional view in which the vicinity of part P in FIG. FIG. 3 is a flow chart of each step of a method for forming a water pipe leakage prevention structure according to an embodiment of the present invention, and a longitudinal cross-section of a partially crushed portion in order to explain changes in the structure in each step. Fig. 2 shows a fractured cross-sectional view; FIG. 4 shows a flow chart of each step of a method for forming a water pipe leakage prevention structure according to a modification of the present invention. Fig. 5 shows a situation in which water leaks through the surface of a water distribution pipe from a gap between a concrete floor slab that constitutes a conventional viaduct and a water pipe installed through the concrete floor slab. The cross-sectional view which demonstrates is shown.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described with reference to the drawings. It should be noted that the embodiments described below do not limit the invention according to the scope of claims. Also, not all of the elements and their combinations described in the embodiments are essential to the solution of the present invention. In the embodiments, constituent elements having the same basic configuration and characteristics are denoted by the same reference numerals across the embodiments, and descriptions thereof may be omitted. The figures showing the components of the invention are schematic diagrams and are not necessarily accurate representations of actual dimensions or proportions.

1. 1. Water Pipe Leakage Prevention Structure FIG. 1 shows a partial side view of a water pipe leakage prevention structure according to an embodiment of the present invention and an enlarged view of a portion P in the side view. FIG. 2 shows a fragmented cross-sectional view in which the vicinity of part P in FIG.

The water pipe leakage prevention structure 1 according to the first embodiment includes a floor slab 20 made of concrete, a water pipe 21 made of resin fixed through the floor slab 20, and a pipe exposed from the floor slab 20. The gap 23 between the self-bonding silicone rubber 5 wrapped around the outer circumference of the water pipe 21 and the floor slab 20 and the water pipe 21 is covered to stop the water leaking from the gap 23 onto the surface of the water pipe 21. and a water-repellent silicone rubber sealant 10 . The silicone rubber sealant 10 adheres to the surface of the self-bonding silicone rubber 5 and the surface of the floor slab 20 on the exposed side of the water pipe 21 to seal the gap 23 along the outer periphery of the water pipe 21. . In the water pipe leakage prevention structure 1 according to this embodiment, the floor slab 20 is a constituent member of the viaduct. However, as long as the floor slabs 20 are installed through the water pipes 21, they are not limited to constituent members of elevated bridges, and can be used to construct structures of any nature, such as buildings such as apartments, schools, hospitals, bridges, and the like. A component may be used. In this embodiment, the water pipe 21 is a resin water pipe (an example of a resin processed product), but water pipes made of other materials (for example, metal pipes such as galvanized steel pipes or SUS pipes) water pipe) is also acceptable. Furthermore, the water pipe 21 may be a fiber reinforced resin (FRP) water pipe.

The floor slab 20 of the viaduct usually includes a groove (also called a water distribution groove or a side groove) 30 through which water W1 such as rainwater or snowmelt water flows. The water W1 on the floor slab 20 flows through the groove 30, flows through the inside 22 of the water pipe 21 installed through the floor slab 20, and flows out under the viaduct (near the ground). When a gap 23 is formed between the floor slab 20 and the water pipe 21, water W2, which is part of the water W1, travels from the gap 23 along the surface of the water pipe 21 to the bottom of the viaduct. In order to easily and reliably dam the water W2, the water pipe leakage prevention structure 1 according to this embodiment includes a self-bonding silicone rubber 5 wound on the surface (also referred to as the outer surface) of the water pipe 21, and the self-bonding silicone rubber 5 A silicone rubber sealant 10 is provided so as to connect the silicone rubber 5 and the floor slab 20 (specifically, the lower surface near the exposed water pipe 21). In this embodiment, the water pipe leakage prevention structure 1 includes the self-bonding silicone rubber 5 and the silicone rubber sealant 10 on the lower surface of the floor slab 20. A structure comprising a flexible silicone rubber 5 and a silicone rubber sealant 10 may be used.

When the gap 23 is formed in a substantially annular shape along the outer periphery of the water pipe 21 , the silicone rubber sealant 10 is preferably formed in a substantially annular shape along the outer periphery of the water pipe 21 . On the other hand, if the gap 23 is formed partly around the outer periphery of the water pipe 21, the silicone rubber sealant 10 may be formed so as to cover part of it, or may be formed around the outer periphery of the water pipe 21. It may be formed in a substantially annular shape along. The "sealing agent" may also be referred to as "sealing member" or "water stop material".

Next, the silicone rubber sealant 10 will be explained.

The silicone rubber sealant 10 is a sealing member obtained by vulcanizing a semi-solid curable silicone adhesive (also referred to as an "adhesive silicone rubber composition" or "adhesive silicone composition") to completely cure it. be. Silicone rubber sealant 10 may also be referred to as adhesive silicone rubber or adhesive silicone. Curable silicone adhesives are a type of non-solvent silicone adhesives that have high adhesive strength and, after curing, silicones that have heat stability, weather resistance, good water resistance, and excellent flexibility. A rubber sealing agent 10 is obtained. A semi-solid curable silicone-based adhesive can maintain a self-supporting shape and has a plasticity that allows it to deform according to pressing force. Therefore, the semi-solid curable silicone adhesive can be deformed according to the irregularities and curved surfaces of the place where it is placed, and can be brought into close contact with the place where it is placed.

The curable silicone adhesive preferably has a Williams plasticity within the range of 50 to 500 at 25°C. The Williams plasticity is measured using a parallel plate plasticity meter (Williams plastometer) according to the measurement method specified in JIS K 6249 "Testing methods for uncured and cured silicone rubber". The curable silicone adhesive is a condensation reaction type curable silicone rubber composition, and preferably can be cured by a simple means of allowing it to react with moisture in the air by allowing it to stand at room temperature. The silicone-based elastomer obtained by curing a curable silicone-based adhesive (that is, the silicone rubber sealant 10) is preferably a moisture-curable silicone-based elastomer. The curable silicone-based adhesive may be an addition reaction-type curable silicone rubber composition that is cured by heating. In that case, the curable silicone-based adhesive consists of a heat-curable silicone-based elastomer. The condensation reaction type curable silicone rubber composition and the addition reaction type curable silicone rubber composition that serve as the adhesive sheet will be described in detail below.

(1) Condensation reaction type curable silicone rubber composition The condensation reaction type curable silicone rubber composition can be mainly composed of, for example, the following components.

(1-1) Organopolysiloxane Organopolysiloxane is the main component of the condensation reaction type curable silicone rubber composition, and is preferably diorganopolysiloxane represented by the following chemical formula (1) or chemical formula (2). It is siloxane. A chemical formula may also be referred to as an average composition formula.

In the chemical formulas (1) and (2) above, R is a monovalent hydrocarbon group. R is an alkyl group (methyl group, ethyl group, propyl group, butyl group, 2-ethylbutyl group, octyl group, etc.), cycloalkyl group (cyclohexyl group, cyclopentyl group, etc.), alkenyl group (vinyl group, propenyl group, butenyl group, heptenyl group, hexenyl group, allyl group, etc.), aryl group (phenyl group, tolyl group, xylyl group, naphthyl group, diphenyl group, etc.), aralkyl group (benzyl group, phenylethyl group, etc.), and the above carbonization Selected from those in which at least part of the hydrogen atoms bonded to the carbon atoms of the hydrogen group are substituted with halogens, cyano groups, etc. (chloromethyl group, trifluoropropyl group, 2-cyanoethyl group, 3-cyanopropyl group, etc.) one or more hydrocarbon groups can be mentioned. The number of carbon atoms in R is preferably 1-12, more preferably 1-10. In the above chemical formulas (1) and (2), A is an oxygen atom or a polymethylene group (including a methylene group) represented by -(CH ₂ ) _m - (m is 1 to 8). A is preferably an oxygen atom or an ethylene group.

In the above chemical formulas (1) and (2), n is an arbitrary number that makes the kinematic viscosity of component (1-1) at 25° C. fall within the range of 100 to 1,000,000 cm ² /s. More preferably, the kinematic viscosity is within the range of 500 to 500000 cm ² /s.

In the above chemical formulas (1) and (2), B is a hydrolyzable group. B includes an alkoxy group (methoxy group, ethoxy group, propoxy group, butoxy group, etc.), a ketoxime group (dimethylketoxime group, methylethylketoxime group, etc.), an acyloxy group (acetoxy group, etc.), an alkenyloxy group (isopropenyloxy group, isobutenyloxy group, etc.). Note that x in the above chemical formulas (1) and (2) is 2 or 3.

The above component (1-1) can be produced by a known method (for example, a method by equilibrium reaction using a cyclic siloxane or linear oligomer and an acid or base catalyst).

When introducing a branched structure into the diorganopolysiloxane as the component (1-1), a silane containing at least one of SiO _3/2 units and SiO _4/2 units or A method of adding siloxane to such an extent that the diorganopolysiloxane does not gel can be used. Regarding component (1-1), it is preferable to remove low-molecular-weight siloxane by washing or the like before use in order to reduce contamination.

(1-2) Cross-Linking Agent As a cross-linking agent, a silane having two or more, preferably three or more hydrolyzable groups in one molecule, or a partially hydrolyzed condensate of the silane is used. Examples of hydrolyzable groups include alkoxy groups (methoxy group, ethoxy group, butoxy group, etc.), ketoxime groups (dimethylketoxime group, methylethylketoxime group, etc.), acyloxy groups (acetoxy group, etc.), alkenyloxy groups (iso propenyloxy group, isobutenyloxy group, etc.), amino group (N-butylamino group, N,N-diethylamino group, etc.), amide group (N-methylacetamide group, etc.). Among these, it is preferable to use an alkoxy group, a ketoxime group, an acyloxy group, and an alkenyloxy group. The amount of the cross-linking agent is preferably in the range of 1 to 50 parts by mass, more preferably in the range of 2 to 30 parts by mass, more preferably 5 to 5 parts by mass, per 100 parts by mass of component (1-1). It is even more preferable to be within the range of 20 parts by mass.

(1-3) Curing Catalyst A curing catalyst is not essential, but curing of the curable silicone rubber composition can be accelerated by using a curing catalyst. Examples of curing catalysts include alkyltin ester compounds (dibutyltin diacetate, dibutyltin dilaurate, dibutyltin dioctoate, etc.), titanate esters or titanium chelate compounds (tetraisopropoxytitanium, tetra-n-butoxytitanium, tetrakis(2- ethylhexoxy)titanium, dipropoxybis(acetylacetona)titanium, titanium isopropoxyoctylene glycol, etc.), other suitable organometallic compounds (zinc naphthenate, zinc stearate, zinc-2-ethyloctoate, iron-2 -ethylhexoate, cobalt-2-ethylhexoate, manganese-2-ethylhexoate, cobalt naphthenate, alkoxyaluminum compounds, etc.), aminoalkyl group-substituted alkoxysilanes (3-aminopropyltriethoxysilane, N -β (aminoethyl)γ-aminopropyltrimethoxysilane, etc.), amine compounds or their salts (hexylamine, dodecylamine phosphate, etc.), quaternary ammonium salts (benzyltriethylammonium acetate, etc.), alkali metal lower fatty acids salt (potassium acetate, sodium acetate, lithium oxalate, etc.), alkali metal lower fatty acid salt, dialkylhydroxylamine (dimethylhydroxylamine, diethylhydroxylamine, etc.), silane or siloxane having a guanidyl group (tetramethylguanidylpropyl trimethoxysilane, tetramethylguanidylpropylmethyldimethoxysilane, tetramethylguanidylpropyltris(trimethylsiloxy)silane, etc.). These may be used alone or as a mixture of two or more. The amount of the curing catalyst is preferably in the range of 0 to 20 parts by mass, more preferably in the range of 0.001 to 10 parts by mass, per 100 parts by mass of component (1-1). More preferably, it is in the range of 0.01 to 5 parts by mass.

(1-4) Filler A filler is not essential, but can be suitably used for purposes such as reinforcement. Examples of fillers include reinforcing agents (fumed silica, precipitated silica, silica obtained by hydrophobizing the surface of these silicas with an organic silicon compound, quartz powder, talc, zeolite, bentonite, etc.), fibrous fillers ( asbestos, glass fiber, organic fiber, etc.), basic fillers (calcium carbonate, zinc carbonate, zinc oxide, magnesium oxide, celite, etc.). Among these, it is preferable to use silica, calcium carbonate and zeolite, and it is more preferable to use fumed silica and calcium carbonate whose surface has been hydrophobized. The amount of the filler to be blended can be selected depending on the purpose and the type of filler, but it is in the range of 1 to 90% by volume and 5 to 60% by volume with respect to the component (1-1). preferably in

(1-5) Adhesion-imparting component An adhesion-imparting component is not essential, but is preferably used. Examples of adhesion imparting components include amino group-containing organoalkoxysilanes (γ-aminopropyltrimethoxysilane, γ-(2-aminoethyl)aminopropyltrimethoxysilane, etc.), epoxy group-containing organoalkoxysilanes (γ-glycan sidoxypropyltrimethoxysilane, etc.), mercapto-containing organoalkoxysilanes (γ-mercaptopropyltrimethoxysilane, etc.), reaction mixtures of amino group-containing organoalkoxysilanes and epoxy group-containing organoalkoxysilanes. The amount of the adhesiveness-imparting component is preferably in the range of 0.1 to 5 parts by weight per 100 parts by weight of component (1-1).

(2) Addition-curable silicone rubber composition When curing an addition-curable silicone rubber composition, the addition-curable silicone rubber composition is mainly composed of the following components. can.

(2-1) Organopolysiloxane Organopolysiloxane is the main component of addition-curable curable silicone rubber compositions and has an average of two or more alkenyl groups per molecule. Examples of alkenyl groups include vinyl, allyl, butenyl, pentenyl, hexenyl and heptenyl groups. Among these, it is preferable to use a vinyl group. In this component, examples of organic groups bonded to silicon atoms other than alkenyl groups include alkyl groups (methyl group, ethyl group, propyl group, butyl group, pentyl group, hexyl group, etc.), aryl groups (phenyl group , tolyl group, xylyl group, etc.), halogenated alkyl groups (3-chloropropyl group, 3,3,3-trifluoropropyl group, etc.). Among these, it is preferable to use a methyl group. Examples of the molecular structure of this component include a straight chain, a partially branched straight chain, a branched chain, a network, and a dendritic structure. The viscosity of this component at 25° C. is preferably 100000 mPa·s or more, more preferably 1000000 mPa·s or more.

Examples of the organopolysiloxane of this component include polydimethylsiloxane having both molecular chain ends blocked with dimethylvinylsiloxy groups, dimethylsiloxane-methylvinylsiloxane copolymer having both molecular chain ends blocked with dimethylvinylsiloxy groups, and trimethylsiloxy groups at both molecular chain ends. Blocked dimethylsiloxane/methylvinylsiloxane copolymer, a siloxane unit represented by (CH ₃ ) ₃ SiO _1/2 and a siloxane unit represented by (CH ₃ ) ₂ (CH ₂ =CH) SiO _1/2 and SiO _{4/ 2} , at least part of the methyl groups of these organopolysiloxanes are alkyl groups (ethyl group, propyl group, etc.), aryl groups (phenyl group, tolyl group, etc.), halogenated Organopolysiloxanes substituted with substituents selected from alkyl groups (3,3,3-trifluoropropyl groups, etc.), and at least part of the vinyl groups of these organopolysiloxanes are alkenyl groups (allyl groups, propenyl groups, etc.) substituted organopolysiloxanes and mixtures of two or more of these organopolysiloxanes can be used.

(2-2) Hydrogenated Organopolysiloxane Hydrogenated organopolysiloxane acts as a curing agent for addition-curing curable silicone rubber compositions. have Examples of silicon-bonded organic groups in this component include alkyl groups (methyl group, ethyl group, propyl group, butyl group, pentyl group, hexyl group, etc.), aryl groups (phenyl group, tolyl group, xylyl group, etc.). ), halogenated alkyl groups (3-chloropropyl group, 3,3,3-trifluoropropyl group, etc.). Among the above, it is preferable to use a methyl group. Examples of the molecular structure of this component include a straight chain, a partially branched straight chain, a branched chain, a network, and a dendritic structure. Although the viscosity of this component at 25° C. is not limited, it is preferably in the range of 1 to 1000000 mPa·s, more preferably in the range of 1 to 10000 mPa·s.

Examples of the hydrogenated organopolysiloxane of this component include polydimethylsiloxane blocked with dimethylhydrogensiloxy groups at both molecular chain terminals, polymethylhydrogensiloxane blocked with trimethylsiloxy groups at both molecular chain terminals, and dimethylsiloxane blocked with trimethylsiloxy groups at both molecular chain terminals. - A methylhydrogensiloxane copolymer, a cyclic polymethylhydrogensiloxane, an organopolysiloxane consisting of a siloxane unit represented by ( _CH3 ) _{2HSiO1/ 2} and a siloxane unit represented by _SiO4/2 , and these organo At least part of the methyl groups of polysiloxane are alkyl groups (ethyl group, propyl group, etc.), aryl groups (phenyl group, tolyl group, etc.), halogenated alkyl groups (3,3,3-trifluoropropyl group, etc.) Substituted organopolysiloxanes and mixtures of two or more of these organopolysiloxanes can be used. Among these, since the mechanical properties (especially elongation) of the resulting cured product are improved, organopolysiloxane having silicon-bonded hydrogen atoms only at both ends of the molecular chain and silicon-bonded side chains of the molecular chain Mixtures with organopolysiloxanes are preferably used.

The content of this component in the addition-curing curable silicone rubber composition is such that the molar ratio of silicon-bonded hydrogen atoms in this component to alkenyl groups in component (2-1) is within the range of 0.01 to 20. The amount is preferably in the range of 0.1 to 10, more preferably in the range of 0.1 to 5. The reason for setting the above range is that if the content of this component is at least the lower limit of the above range, the adhesive silicone rubber tends to be sufficiently cured. This is because the cured adhesive sheet tends to have higher mechanical properties. When using a mixture of organopolysiloxane having silicon-bonded hydrogen atoms only at both ends of the molecular chain and organopolysiloxane having silicon-bonded side chains in the molecular chain as this component, the former organopolysiloxane The content of is preferably such that the molar ratio of silicon-bonded hydrogen atoms in component (2-1) to alkenyl groups in component (2-1) is in the range of 0.01 to 10, preferably 0.1 to An amount within the range of 10 is more preferable, and an amount within the range of 0.1 to 5 is even more preferable. The content of the latter organopolysiloxane should be such that the molar ratio of silicon-bonded hydrogen atoms in component (2-1) to alkenyl groups in component (2-1) is within the range of 0.5 to 20. is preferred, the amount in the range of 0.5 to 10 is more preferred, and the amount in the range of 0.5 to 5 is even more preferred.

(2-3) Curing Catalyst A curing catalyst is not essential, but a preferred example is a platinum-based catalyst for hydrosilylation reaction. Examples of platinum-based catalysts for hydrosilylation reactions include fine platinum powder, platinum black, chloroplatinic acid, alcohol-modified chloroplatinic acid, complexes of platinum and diketones, complexes of chloroplatinic acid and olefins, and chloroplatinic acid and alkenylsiloxanes. and complexes thereof, and those supported on carriers (alumina, silica, carbon black, etc.). Among these, it is preferable to use a complex of chloroplatinic acid and alkenylsiloxane because of its high catalytic activity. Further, it is more preferable to use a complex of chloroplatinic acid and divinyltetramethyldisiloxane. The amount of component (2-1) to be blended is preferably in the range of 1 to 1000 parts by mass, more preferably in the range of 1 to 100 parts by mass in terms of platinum metal atoms, per 1 million parts by mass of component (2-1). is more preferred.

(2-4) Fillers Fillers are preferably added in order to improve the mechanical strength of the addition-curing curable silicone rubber composition. compounds can be used. Examples of this component include fumed silica, precipitated silica, calcined silica, pulverized quartz, and powder obtained by surface-treating these silica powders with an organosilicon compound (organoalkoxysilane, organohalosilane, organosilazane, etc.). can be mentioned. In particular, in order to sufficiently improve the mechanical strength of the cured adhesive sheet, it is preferable to use silica powder having a BET specific surface area of 50 m ² /g or more as this component.

Addition of this component to the addition-curing curable silicone rubber composition is optional, but in order to improve the mechanical strength of the cured adhesive silicone rubber, the blending amount of this component should be (2-1). It is preferably in the range of 1 to 1,000 parts by mass, more preferably in the range of 1 to 400 parts by mass, based on 100 parts by mass of the component. In addition, the addition-curing curable silicone rubber composition may contain other optional components such as fumed titanium oxide, diatomaceous earth, iron oxide, aluminum oxide, aluminosilicate, calcium carbonate, zinc oxide, and aluminum hydroxide. of inorganic fillers and organic fillers. The addition-curing curable silicone rubber composition may contain fillers obtained by treating the surface of these fillers with the aforementioned organosilicon compounds. The amount of the filler compounded can be selected depending on the purpose and the type of filler, but it is in the range of 1 to 90% by volume and 5 to 60% by volume with respect to the component (2-1). Preferably.

(2-5) Adhesion-imparting component This component is not essential, but it is preferably used to impart and improve the adhesiveness of the addition-curing curable silicone rubber composition so that it functions as an adhesive. is possible. Examples of this component include silane coupling agents and partial hydrolysates thereof (methyltrimethoxysilane, vinyltrimethoxysilane, allyltrimethoxysilane, 3-methacryloxypropyltrimethoxysilane, 3-glycidoxypropyltrimethoxysilane, silane, 3-aminopropyltrimethoxysilane, N-(2-aminoethyl)-3-aminopropyltrimethoxysilane, bis(trimethoxysilyl)propane, bis(trimethoxysilyl)hexane, etc.), epoxy group, acid An organic compound having an anhydride group and an α-cyanoacryl group, a siloxane compound having an epoxy group, an acid anhydride group and an α-cyanoacryl group, an epoxy group, an acid anhydride group and an α-cyanoacryl group and an alkoxysilyl groups, titanium compounds (tetraethyl titanate, tetrapropyl titanate, tetrabutyl titanate, tetra(2-ethylhexyl) titanate, titanium ethylacetonate, titanium acetylacetonate, etc.), aluminum compounds (ethylacetonate Acetate aluminum diisopropylate, aluminum tris(ethylacetoacetate), alkylacetoacetate aluminum diisopropylate, aluminum tris(acetylacetonate), aluminum monoacetylacetonate bis(ethylacetoacetate), etc.), zirconium compounds (zirconium acetylacetoacetate) zirconium butoxyacetylacetonate, zirconium bisacetylacetonate, zirconium ethylacetoacetate, etc.). As the above siloxane compound, lower aliphatic unsaturated groups such as alkenyl groups, acryloyl groups, and methacryloyl groups, or those having hydrosilyl groups in combination with these groups can be expected to effectively contribute to the improvement of adhesiveness. The content of the adhesiveness-imparting component is not particularly limited, but is preferably in the range of 0.01 to 10 parts by weight per 100 parts by weight of component (2-1).

Furthermore, addition-curing curable silicone rubber compositions contain acetylenic compounds (3-methyl-1-butyn-3-ol, 3,5-dimethyl-1-hexyne- 3-ol, 3-phenyl-1-butyn-3-ol, etc.), enyne compounds (3-methyl-3-penten-1-yne, 3,5-dimethyl-3-hexene-1-yne, etc.), 1 Organosiloxane compounds having 5% by mass or more of vinyl groups in the molecule (1,3,5,7-tetramethyl-1,3,5,7-tetravinylcyclotetrasiloxane, 1,3,5,7-tetramethyl -1,3,5,7-tetrahexenylcyclotetrasiloxane, both molecular chain terminal silanol group-blocked methylvinylsiloxane, molecular chain both terminal silanol group-blocked methylvinylsiloxane/dimethylsiloxane copolymer, etc.), other curing inhibitors (triazoles such as benzotriazole, phosphines, mercaptans, hydrazines, etc.) are preferably contained. Although the content of these components is not limited, it is preferably in the range of 0.001 to 5 parts by mass per 100 parts by mass of component (2-1).

The method of preparing the addition-curing curable silicone rubber composition is not limited, and it can be prepared by mixing other optional components as necessary. 3) It is preferable to add the remaining components to the base compound prepared by heating and mixing the components. When adding other optional components, it may be added when preparing the base compound, and when other optional components are degraded by heating and mixing, the components (2-2) and (2- 4) It may be added when the ingredients are added. Further, when preparing the base compound, the surface of the component (2-3) may be treated in-situ by adding the organosilicon compound.

Next, the self-bonding silicone rubber 5 will be explained.

The self-bonding silicone rubber 5 is a cured product obtained by curing a silicone composition containing a diorganopolysiloxane represented by the following chemical formula (3) and a boric acid compound. The main differences between the self-bonding silicone rubber 5 and the above-described semi-solid curable silicone adhesive are the following two points.
One is that the self-bonding silicone rubber 5 is a cured product, whereas the semi-solid curable silicone adhesive is an unvulcanized product.
Another is that the self-bonding silicone rubber 5 contains a boric acid compound to exhibit self-bonding properties, whereas the semi-solid curable silicone adhesive does not necessarily contain a boric acid compound. is not necessary to include .

（式（３）におけるＲ^１は、炭素数１～１０の炭化水素基である。式（３）中のｎは、１．９８～２．０２である。）

(R ¹ in formula (3) is a hydrocarbon group having 1 to 10 carbon atoms. n in formula (3) is 1.98 to 2.02.)

R ¹ in formula (3) is a hydrocarbon group having 1 to 10 carbon atoms, preferably 1 to 8 carbon atoms. Examples of hydrocarbon groups include alkyl groups, cycloalkyl groups, alkenyl groups, and aryl groups. Examples of alkyl groups include methyl, ethyl, propyl, and butyl groups. Cycloalkyl groups include, for example, a cyclohexyl group and the like. Examples of alkenyl groups include vinyl groups, allyl groups, butenyl groups, and hexenyl groups. Aryl groups include, for example, a phenyl group and a tolyl group. R ¹ may also be a group in which some or all of the hydrogen atoms of the above hydrocarbon group are substituted with a halogen atom, a cyano group, or the like. When curing the above silicone composition, if the curing is accelerated with an organic peroxide described later, R ¹ is an alkenyl group or part or all of the hydrogen atoms of the alkenyl group are substituted with a halogen atom or a cyano group. group is preferred. n in formula (3) ranges from 1.98 to 2.02. When n is within this range, better self-bonding properties are obtained.

The kinematic viscosity of the diorganopolysiloxane at 25° C. is preferably from 100 to 100,000,000 cSt, more preferably from 100,000 to 10,000,000 cSt. If the kinematic viscosity at 25°C of the diorganopolysiloxane is within the above range, the handling property before curing and the mechanical properties after curing are excellent.

Examples of boric acid compounds include boric acid and boric anhydride derivatives. Examples of boric acid include boric anhydride, pyroboric acid, and orthoboric acid. Derivatives of boric anhydride include, for example, trimethyl borate, triethyl borate, trimethoxyboroxine and the like. As the boric acid compound, a polyorganoborosiloxane obtained by condensing an organoalkoxysilane such as dimethyldimethoxysilane or dimethyldiethoxysilane with boric anhydride can also be used. A boric acid compound may be used individually by 1 type, and may use 2 or more types together.

The content of the boric acid compound in the silicone composition is preferably 0.1 to 50 parts by mass, more preferably 0.5 to 30 parts by mass, based on 100 parts by mass of diorganopolysiloxane. It is more preferably 1 to 5 parts by mass. If the content of the boric acid compound is at least the lower limit, sufficient self-adhesiveness can be ensured, and if it is at most the upper limit, deterioration of mechanical properties can be suppressed.

The silicone composition may contain an organic peroxide to facilitate curing of the silicone composition. Examples of organic peroxides include hydroperoxides, dialkyl peroxides, peroxyesters, diacyl peroxides, peroxydicarbonates and the like. One of these organic peroxides may be used alone, or two or more thereof may be used in combination.

The content of the organic peroxide in the silicone composition is preferably 0.1 to 10 parts by mass, more preferably 0.5 to 3.0 parts by mass, per 100 parts by mass of diorganopolysiloxane. more preferred. When the content of the organic peroxide is at least the above lower limit, curing can be sufficiently accelerated.

The thickness of the center of the self-bonding silicone rubber 5 in the width direction is preferably 0.5 to 1.5 mm, and the thickness of the ends of the self-bonding silicone rubber 5 in the width direction is preferably 0 to 0.5 mm. (In this case, 0 is not included.). The width of the self-bonding silicone rubber 5 is preferably 15-50 mm, more preferably 20-40 mm. If the width of the self-adhesive silicone rubber 5 is equal to or greater than the lower limit, the number of turns on the water pipe 21 can be suppressed, making repair easier. can curb the use of

The maximum tensile load of the self-bonding silicone rubber 5 is preferably 70N or more, more preferably 80N or more, and even more preferably 100N or more. The tensile elongation of the self-bonding silicone rubber 5 is preferably 300% or more, more preferably 400% or more, and even more preferably 500% or more. If the maximum tensile load and tensile elongation of the self-bonding silicone rubber 5 are at least the above lower limits, the self-bonding silicone rubber 5 can exhibit sufficiently high self-bonding properties. The above maximum tensile load and tensile elongation are values obtained by measuring the tape-shaped self-bonding silicone rubber 5 using a tensile tester under conditions of 23° C. and a tensile speed of 500 mm/min.

2. 3. Method of Forming Structure for Preventing Water Leakage from Distributing Pipes FIG. 3 is a partially broken diagram for explaining a flow chart of each step of a method for forming a structure for preventing water pipe leakage according to an embodiment of the present invention and structural changes in each step. Fig. 2 shows a fragmented cross-sectional view showing a fragmented portion in longitudinal section;

The method of forming the water pipe leakage prevention structure according to this embodiment includes a floor slab 20 made of concrete, a water pipe 21 fixed through the floor slab 20, and a water pipe 21 exposed from the floor slab 20. and a gap 23 between the floor slab 20 and the water pipe 21 is covered to stop the water W2 leaking out from the gap 23 onto the surface of the water pipe 21. The silicone rubber sealant 10 adheres to the surface of the self-bonding silicone rubber 5 and the surface of the floor slab 20 located on the exposed side of the water pipe 21, and the water pipe 21 is sealed. A method of forming a water pipe leakage prevention structure 1 that seals a gap 23 along the outer circumference, a method of forming a water pipe leakage prevention structure 1 using a floor slab 20 as a constituent member of a viaduct, and a water pipe 21. This is a method of forming a water pipe leakage prevention structure 1 as a resin processed product.

The method for forming the water pipe leakage prevention structure includes a winding step (S100), an adhesion step (S200), and a curing step (S300). Hereinafter, a method for forming a water pipe leakage prevention structure will be described with reference to the drawings.

(1) Winding step (S100)
In this step, a tape of self-adhesive silicone rubber 5 is wound around the outer periphery of the water pipe 21 exposed from the floor slab 20 made of concrete. The tape is preferably wound multiple times with a predetermined length from the boundary between the water pipe 21 and the floor slab 20 or the vicinity thereof in a direction away from the vicinity. Through this step, the surface of the water pipe 21 is partially siliconized.

(2) Adhesion step (S200)
This step is a step of bonding the semi-cured adhesive silicone rubber composition 10a to the surface of the self-bonding silicone rubber 5 and the surface of the floor slab 20 on the exposed side of the water pipe 21 . Note that the "adhesive silicone rubber composition" is referred to as "adhesive silicone rubber composition 10a" only in the description based on FIG. 3 and FIG. 4 described later. When the adhesive silicone rubber composition 10a is a condensation reaction type curable silicone rubber composition, the adhesive silicone rubber composition 10a is removed from the sealed bag, and the composition 10a is removed as quickly as possible. It is preferable that the surface of the self-bonding silicone rubber 5 and the surface of the floor slab 20 on the exposed side of the water pipe 21 are closely adhered to fill the gap 23 .

(3) Curing step (S300)
In this step, the adhesive silicone rubber composition 10a in a semi-cured state is cured to seal the gap 23. As shown in FIG. The curing method differs depending on the type of adhesive silicone rubber composition 10a. For example, when the adhesive silicone rubber composition 10a is a condensation reaction type curable silicone rubber composition, it can be cured by being left in the air. When the adhesive silicone rubber composition 10a is an addition reaction type curable silicone rubber composition, it can be cured by heating.

FIG. 4 shows a flow chart of each step of a method for forming a water pipe leakage prevention structure according to a modification of the present invention.

In the method for forming a water pipe leakage prevention structure according to this modification, before the winding step (S100) described above, the surface of the floor slab 20 on the exposed side of the water pipe 21 is scraped and/or A step of applying a primer to the surface (S50) is included. In this application, application of the primer is also referred to as priming. Therefore, S50 is also called a keren treatment step and/or a primer treatment step. The term "cleaning treatment" may be replaced with "polishing treatment" or "surface cleaning treatment". The keren treatment step and/or primer treatment step (S50) may be performed after the winding step (S100) as long as it is a step performed prior to the bonding step (S200). S50 may be any of a step of cleaning treatment only, a step of primer treatment only, or a step of applying a primer after cleaning treatment.

INDUSTRIAL APPLICABILITY The present invention can be used in industries related to preventing water leakage from gaps between water pipes and floor slabs.

DESCRIPTION OF SYMBOLS 1... Water pipe leak prevention structure, 5... Self-bonding silicone rubber, 10... Silicone rubber sealing agent, 20... Floor slab, 21... Water pipe, 23... Gap.

Claims (4)

concrete floor slabs,
a water pipe fixed through the floor slab;
a self-bonding silicone rubber wound around the outer periphery of the water pipe exposed from the floor slab;
a silicone rubber sealant that covers the gap between the floor slab and the water pipe to stop water leaking out from the gap to the surface of the water pipe;
with
The silicone rubber sealant adheres to the surface of the self-bonding silicone rubber and the surface of the floor slab on the exposed side of the water pipe to seal the gap along the outer periphery of the water pipe. A method for forming a water pipe leakage prevention structure characterized by:
A winding step of winding a self-bonding silicone rubber tape around the outer periphery of the water pipe exposed from the concrete floor slab;
a bonding step of bonding a semi-cured adhesive silicone rubber composition to the surface of the self-bonding silicone rubber and the surface of the floor slab on the exposed side of the water pipe;
a curing step of curing the semi-cured adhesive silicone rubber composition to seal the gap;
A method of forming a water pipe leakage prevention structure comprising: 2. The method of forming a water pipe leakage prevention structure according to claim 1, wherein the floor slab is a component of an elevated bridge. 3. The method of forming a water pipe leakage prevention structure according to claim 1, wherein the water pipe is a resin-processed product. 4. The method according to any one of claims 1 to 3, characterized in that, prior to the adhering step, the surface of the floor slab on the exposed side of the water pipe is subjected to keren treatment and/or the surface is coated with a primer. The method for forming the water pipe leakage prevention structure according to the above item.

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