JPH06173207A - Water-proof and vibration-proof material for ballast track floor plate and construction method using the material - Google Patents

Abstract

(57) [Abstract] [Purpose] The present invention is to easily perform waterproof and vibration isolation without removing the ballast of the railroad track deck slab of a railway viaduct. According to the present invention, (a) a urethane prepolymer having a free isocyanate content of 15% by weight or less, and (b) a bitumen emulsion, and optionally cement or lime, or a mixture of both. Water-proof and vibration-proof material for raceway floor slab, and ballast raceway floor-board waterproofing and vibration-proof construction method using the same.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a waterproof and vibration-proof construction method for railroad ballast floor slabs.

[0002]

2. Description of the Related Art In recent years, many elevated ballast floor slabs have been constructed for reasons such as an increase in the concentration of urban man-made, difficulty in securing land for new routes, prevention of noise pollution, and alleviation of traffic congestion. However, a concrete track slab is prone to cracking due to drying shrinkage during hardening of the concrete, and cracks due to vibration due to vehicle passage or shaking due to an earthquake.

As a conventional waterproofing method for ballast orbit floor slabs, there is a method of injecting a rubber asphalt emulsion water-soluble waterproofing agent and permeating and coagulating as in JP-A-63-89701. Due to the film-forming mechanism, the effect of temperature is extremely large, and in winter the drying is slow and the hardening is extremely slow. Also, under a ballast, the evaporation of water is particularly slow, so it takes a long time to cure, and since the coating film that is formed is not a cross-linking type, it swells when leaking again with rainwater, etc. I can't say that.

Japanese Patent Laid-Open No. 63-304803 describes a two-pack type urethane containing a urethane prepolymer as a main component and a urethane compound as a curing agent. Water is easily leaked due to poor adhesion. In particular, under a ballast, the orbital floor slab is always wet, so it cannot be said that it is a good waterproof material. Further, since a special amine such as diaminodiphenylmethane-based amine is mixed in the urethane compound, not only the material is expensive, but also the handling is necessary.

[0005]

In view of the above-mentioned circumstances, the present invention provides a novel modified bituminous composition for ballast orbit floor slab which solves the above problems, and a new waterproof and vibration-proof construction method to which the composition is applied. The challenge is to provide.

[0006]

That is, the gist of the present invention is mainly a modified bitumen composition obtained by mixing (a) a urethane prepolymer having a free isocyanate content of 15% by weight or less and (b) a bitumen emulsion. The first invention is a waterproof and vibration-proof material for ballast raceway floor slabs, which is characterized by containing

A second invention is a waterproof vibration isolating method for a ballast race floor slab, which is characterized in that the waterproof vibration proof material is injected to form a film on the shelt layer and the floor slab surface.

A third aspect of the present invention is a waterproof vibration isolating method for a ballast raceway floor slab, which is characterized in that the waterproof vibration proof material is poured into the floor slab to allow it to permeate and solidify at the water leaking or flooding site.

In the urethane prepolymer having a free isocyanate content of 15% by weight or less (hereinafter referred to as urethane prepolymer) used in the present invention, the polyols are mono, di and tripropylene glycol, mono,
Di- and tri-ethylene glycol, glycerin, trimethylolpropane, pentaerythritol, sorbitol, castor oil, polybutadiene containing 2-3 terminal hydroxyl groups, mono-, di- and triethanolamine, aniline, polytetramethylene glycol, bisphenol A, hydro Specific examples thereof include quinone and the like, or a mixture thereof, or a polyol obtained by addition-polymerizing alkylene oxides such as ethylene oxide, propylene oxide, butylene oxide and styrene oxide.

Next, as an organic polyisocyanate, 2.4
-/ 2-6-80 / 20- and 65 / 35-tolylene diisocyanate (hereinafter referred to as TDI), diphenylmethane diisocyanate (hereinafter referred to as MDI), polymethylene polyphenyl isocyanate, naphthalene diisocyanate, xylylene diisocyanate, hexamethylene diisocyanate. , Triphenylmethane triisocyanate, hydrogenated TDI, hydrogenated MDI, isophorone diisocyanate, etc., alone or in a mixture.

The NCO / OH equivalent ratio of the organic polyisocyanate to the polyol is 1.5 to 10.0, preferably 2.0 to 3.0. Also, as the organic polyisocyanate, first, tolylene diisocyanate was NCO.
After reacting with a polyol at an OH / OH equivalent ratio of about 1.5 to 2.0, polymethylene polyphenyl isocyanate and the like are further added and mixed to make the overall NCO / OH equivalent ratio 2.0 to 10.0. Good. The urethane prepolymer obtained contains free isocyanate in an amount of 15% by weight or less, preferably 2 to 15% by weight.

Further, an organic inert diluent is added to the urethane prepolymer in order to improve workability. Examples of the organic inert diluent include toluene, xylene, 1.1.1-trichloroethane, methyl ethyl ketone, dibutyl and dioctyl phthalate, dibasic acid esters such as dimethyl succinate, dimethyl glutanate and dimethyl adipate, ethylene glycol diacetate. ,
Examples thereof include glycol fatty acid esters such as diethylene glycol diacetate, isoparaffin, chlorinated paraffin, and process oil. The amount of these organic inert diluents added is 0 to 6 in the urethane prepolymer.
It is present in an amount of 0% by weight, preferably 10 to 30% by weight.

Next, the bitumen emulsion used in the present invention includes straight asphalt, prone asphalt,
Cutpack asphalt, propane deasphalting bitumen, etc. Petroleum asphalt, heavy oil, natural asphalt, tar, bitumen bituminous substances mixed with two or more kinds, various anionic and nonionic surfactants and clay ( For example, one or more emulsifiers such as bentonite), alkalis, acids, salts, dispersants, protective colloids and the like are used to emulsify in water using a suitable emulsifying machine such as a colloid mill, homogenizer and homomixer. Examples thereof include bitumen emulsion.

In the bitumen emulsion, known emulsification techniques for bituminous substances such as an emulsifier for bituminous substances, other substances used for emulsification, and a method for emulsifying bituminous substances are used. For example, as an ordinary emulsification method, a method in which a bituminous product is heated and melted into a liquid state and mixed with an emulsified liquid prepared by dissolving an emulsifier and the like in water through an emulsifying machine is used. At this time, a part of the emulsifier may be added to the bituminous product.

Examples of anionic emulsifiers used for preparing bitumen emulsions include higher alcohol sulfates,
Alkyl allyl sulfonate, alkyl benzene sulfonate, α-olefin sulfonate, higher alcohol ethoxylate, higher alcohol ethoxylate sulfate, soap, naphthalene sulfonate and its formalin modified product, alkali lignin salt, lignin sulfonate , Casein alkali salts, polyacrylates,

Examples of nonionic emulsifiers include adducts of alkylene oxides (ethylene oxide or mainly ethylene oxide) such as alkylphenols, mono- and polyhydric alcohols, fatty acids, aliphatic amines, fatty acid amides and ethanolamines. Etc.

Further, as the dispersant and protective colloid,
Examples thereof include sodium naphthalene sulfonate, casein, alginic acid, gelatin, carboxymethyl cellulose, ethyl cellulose, hydroxyethyl cellulose, polyvinyl alcohol, sodium polyacrylate, lignin sulfonate, and nitrohumate.

The bitumen emulsion used in the present invention includes
The above bituminous materials include natural rubber, synthetic rubber (for example, styrene-butadiene rubber, isoprene rubber, butadiene rubber, etc.), synthetic polymer resin (for example, ethylene vinyl acetate copolymer, polyethyl and methyl, acrylate,
Modification by adding polyacrylate, polyvinyl chloride, etc., synthetic resin (eg, coumarone resin, carboxylic acid resin, xylene resin, urea-formalin resin, alkyd resin, etc.), natural resin (rosin, terpene resin, etc.) It also includes a bitumen emulsion obtained by emulsifying the obtained bituminous product in water.

Further, the bituminous emulsion used in the present invention includes those obtained by adding latex or emulsion of natural rubber, synthetic rubber, synthetic polymer resin, synthetic resin, natural resin, etc. to the above-mentioned bituminous emulsion. Further, to these bituminous emulsions, additives for the purpose of heat resistance, prevention of aging, absorption of ultraviolet rays and improvement of adhesiveness, additives for the purpose of adjusting viscosity and improving workability, etc. may be added.

Next, if necessary, cement, lime alone or a mixture of both (hereinafter simply referred to as cement), a modifier and the like may be added to the modified bitumen composition of the present invention.

Examples of the cement and the like include Portland cement, fly ash cement, blast furnace cement, blast furnace colloid cement, colloid cement, silica cement, sulfate resistant cement, cement such as alumina cement, lime such as quick lime and slaked lime, or both of them. A mixture etc. are mentioned.

Although these cements and the like do not react directly with the urethane prepolymer, they absorb carbon dioxide gas generated when the isocyanate group in the urethane prepolymer reacts with the water in the bituminous emulsion, and become non-foamed. It also contributes to the improvement of mechanical properties of the cured product. When used in combination, these cements and the like are preferably added to the urethane prepolymer on site immediately before use.

The amount of cement or the like added is 2 to 80% by weight, preferably 10 to 60% by weight, based on the urethane prepolymer.

Further, examples of the modifier include an endowment agent such as heat resistance, ultraviolet ray resistance and durability, and the addition amount thereof is 0.1 to 3% by weight based on the urethane prepolymer.

The (a) urethane prepolymer and (b) bitumen emulsion in the modified bitumen composition of the present invention, and the mixing method of cement and the like, which is optionally added, are not particularly limited. A) The mixing ratio (weight) of urethane prepolymer and (b) bitumen emulsion is 10: 1 to
It is 1:10, preferably 2: 1 to 1: 2.

In the thus obtained waterproof and vibration-proof material of the present invention, the injection pipes are inserted at a predetermined interval into the balls on the floor slab of the railway viaduct without moving the balls, and the upper surface of the injection pipe. Inject more or insert the tip of the infusion pump into the ballast and press fit. Before the water-proof and vibration-isolating material of the present invention is injected, a preliminary primer may be injected to further improve the effect.

[0027]

The waterproof and vibration-proof material of the present invention becomes a polyurethane resin having a secondary or three-dimensional structure having a urethane bond or a urea bond, and further cement or the like and a bituminous material are dissolved or dispersed in a homogeneous manner to form a composite body. To form.

Further, these waterproof and vibration-proof materials are injected into a ballast to form the composite on the upper surface of the shelt layer and the floor slab, and also on the leaked or infiltrated portion such as cracks or junkers generated on the floor slab. It permeates and solidifies to form the composite, resulting in waterproof and anti-vibration properties.

The waterproof and vibration-proof construction method of the present invention is extremely simple and quick, and since the ballast itself is not hardened, it does not hinder the work of replacing the ballast, and can also inhibit the buffering effect of the ballast. Absent.

[0030]

The present invention will be described in more detail with reference to Examples and Comparative Examples, but the present invention is not limited to these Examples.

Example 1 A urethane prepolymer having a free isocyanate content of 4.0% by weight obtained from TDI and a polyol obtained by addition-polymerizing propylene oxide with glycerin (average molecular weight 3000) and an anionic asphalt bitumen emulsion (evaporation residue 65 By weight, the penetration degree of the evaporation residue was 150), and further, Portland cement was mixed in a weight ratio of 10: 10: 2 to obtain a waterproof and vibration-proof material made of a bituminous composition.

Next, this waterproof / vibration-proof material was compressed with air of 7 kg /
It was injected from the tip 2 of the injection pipe from the upper surface of the ballast 1 through an injection pump having a rotation speed of 300 to 2000 rpm and a discharge rate of 8 ml / min, which was driven by cm ² . The waterproof and vibration-proof material penetrated between the ballasts 1 while diffusing downward, and reached the shelt layer 3 on the upper surface of the concrete floor slab 4. Then, a film was formed on the upper surface of the shelt layer 3, that is, the concrete floor slab 4. At the same time, it penetrated into the junk 5 and the crack 6 formed in the concrete floor slab 4 to form a film. The injection rate is 2.0 kg / cm
^{Was 2} . After standing for one week, tap water was sprayed from the upper surface of the ballast 1, but no water leakage was observed from the lower surface of the concrete floor slab 4. When the ballast 1 was removed, the cracks 6 and the junkers 5 were uniformly and completely sealed with the coating, and no blister was observed. The sprinkling rate was 10 kg / cm ² .

Example 2 The modified bituminous composition used in Example 1 was immersed in water for 24 hours in advance, and 2.0 kg / m ^{2 was} applied on the pulled-up slate plate and immediately put in an oven at 70 ° C. for 7 days. After leaving it to stand, the presence or absence of blisters, bubbles and the like due to the evaporation of the water impregnated on the slate plate was observed, and the adhesion test method was carried out; the adhesion test was carried out in accordance with the quality standards for building materials of the Japan Housing Corporation and the test method. As a result, there was no blister,
The adhesive strength was 2.5 kg / cm ² .

Comparative Example 1 A cationic rubber asphalt emulsion (56% evaporation residue) was used in place of the modified bitumen composition of Example 2, and the same test as in Example 2 was conducted except that the asphalt was melted. Flow and adhesion tests were not possible.

Comparative Example 2 Instead of the modified bituminous composition of Example 2, a color urethane waterproof material having a mixing ratio of the main agent to the curing agent of 1: 1 (3.5% free isocyanate as the main agent, 3,3 'curing agent). -Dichloro-4,
4'-diaminodiphenylmethane 5%, inorganic filler 30
%, 45% of plasticizer, 15% of polyol, and 5% of stabilizer) were used, and the others were applied and tested in the same manner as in Example 2, and a large amount of blisters were generated on the surface of the coating film. The adhesive strength was 0.2 kg / cm ² , and the coating film and the slate plate were easily peeled off.

[0036]

EFFECTS OF THE INVENTION By applying the waterproof and vibration-proof construction method using the waterproof and vibration-proof material of the present invention, (1) it can be easily waterproofed without removing ballast, and (2) at the same time as the waterproofing of concrete floor slabs. It can also exhibit anti-vibration effect, (3) it can be installed in a short time, so it does not interfere with the initial operation at night, (4) has great crack followability and adhesiveness, and (5) has excellent heat and cold resistance. , (6) Blisters do not occur even on the wetted surface and the adhesiveness is good. (7) Since it is press-fitted with a pump, it is possible to have excellent advantages such as being able to apply waterproof and vibration-proof material in a wide range. It can contribute to the construction of elevated tracks.

[Brief description of drawings]

FIG. 1 is an enlarged partially cutaway vertical sectional view of a ballast orbit used in an embodiment of the present invention.

[Explanation of symbols]

 1 Ballast 2 Tip of Injection Pipe 3 Shelt Layer 4 Concrete Floor Slab 5 Junker 6 Crack

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification number Office reference number FI technical display location C09K 3/18 101 8318-4H E01B 19/00 Z 7322-2D

Claims (3)

[Claims] 1. The content of (i) free isocyanate is 15
A water-proof and vibration-proof material for ballast race floor slabs, which comprises a modified bitumen composition obtained by mixing a urethane prepolymer in an amount of not more than 1% by weight and (b) a bituminous emulsion. 2. The content of (i) free isocyanate is 15
A method for waterproofing and vibration-proofing a ballast race floor slab, which comprises injecting a modified bitumen composition obtained by mixing a urethane prepolymer in an amount of not more than 5% by weight and (b) a bituminous emulsion to form a coating on the shelt layer and floor slab surface. . 3. (a) The free isocyanate content is 15
Water-proofing of a ballast race floor slab characterized by injecting a modified bituminous composition obtained by mixing a urethane prepolymer in an amount of not more than 5% by weight and (b) a bituminous emulsion, and injecting and consolidating the water in the floor slab for water leakage or infiltration. Shaking method.