JPH0454019B2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention has a layered structure independent from the base concrete, and even if the base concrete cracks or deforms, it does not follow suit and maintains a good waterproof effect. It concerns a new waterproofing method that can be maintained.

Conventional technology Asphalt waterproofing methods, sheet waterproofing methods, and paint film waterproofing methods are known as waterproofing methods for concrete structures, but all of these methods involve fixing a waterproof layer on top of the underlying concrete. Therefore, it is necessary to use a material that has some degree of elasticity so that it can follow the cracking and deformation of the base.

However, during long-term use, such materials denature or deteriorate, gradually decreasing their elasticity and eventually becoming unable to cope with the cracks and deformation of concrete, resulting in cracks and gaps within themselves. This has the disadvantage that the waterproofing effect is lost, and in addition, it requires a lot of labor and time because it has to be applied in multiple layers to provide the necessary strength.

Additionally, in order to improve the drawbacks of this construction method, it has been proposed to insert a polyurethane resin layer between the base concrete and the waterproof layer to prevent the two from sticking together (Japanese Patent Laid-Open No. 1983-1993). Publication No. 87821).

However, polyurethane resin is expensive and unsuitable as a raw material for large-scale construction work, and it is not completely insulated from cracking or deformation of the underlying concrete because it forms a soft bond with the underlying concrete. Furthermore, the adhesion to the waterproof layer applied to the top surface is insufficient, making it difficult to maintain a good waterproof effect over a long period of time, which inevitably limits the field of application.

Problems to be Solved by the Invention The present invention uses low-cost materials, maintains a good waterproof effect over a long period of time, is completely insulated from the underlying concrete, and is capable of following the cracking and deformation of the underlying concrete. This was done for the purpose of forming a waterproof layer.

Means for Solving the Problems The present inventor has developed a method that overcomes the drawbacks of such conventional waterproofing methods, can be easily applied, and can maintain the waterproofing effect over a long period of time. As a result of extensive research, we discovered that this goal could be achieved by insulating the underlying concrete with a layer of asphalt epoxy resin, and then providing a layer of glass fiber reinforced resin to cover the entire surface of the underlying concrete. Based on these findings, the present invention has been completed.

That is, in the present invention, an asphalt epoxy resin layer is first provided on the base concrete, and then a glass fiber layer impregnated with a resin composition containing an unsaturated polyester and a curing catalyst is applied and cured. The present invention provides an insulation waterproofing method characterized by forming a waterproof layer with a layered structure independent from the base concrete by applying a finishing coat layer.

Next, the method of the present invention will be explained with reference to the accompanying drawings.

The drawing is a partially peeled perspective view showing an example of a waterproof structure constructed by the method of the present invention, in which an asphalt epoxy resin layer 2 is first placed as an insulating layer on a base concrete 1, and then a glass fiber layer is placed on top of the asphalt epoxy resin layer 2 as an insulating layer. A reinforced unsaturated polyester resin layer 3 and a finishing coat layer 4 are formed thereon.

In the method of the present invention, asphalt epoxy resin is used to form the insulating layer, but this resin is obtained by epoxidizing asphalt, which is a by-product in large quantities in the petroleum industry, as a raw material. It can form a completely insulating layer and has good adhesion to the cured unsaturated polyester layer.

Therefore, the above-mentioned insulating layer is an independent layer that is in contact with the base concrete but is not affected by changes in the shape of the base concrete, and is composed of a coating film of asphalt epoxy resin.

This asphalt epoxy resin layer 2 insulates the base concrete 1 and the glass fiber reinforced resin layer 3 to prevent the glass fiber reinforced resin layer from being corroded by alkali exuding from the concrete.

Next, the glass fibers used to form the glass fiber reinforced resin layer are those normally used in glass fiber reinforced resin molded products, such as chop strand mat, roving cloth, filament mat, glass cloth, and roving. Any form can be mentioned. In addition, the unsaturated polyester resin composition to be impregnated into the glass fibers includes saturated dibasic acids such as phthalic acid, isophthalic acid, succinic acid, and adipic acid, and unsaturated dibasic acids such as maleic acid and fumaric acid. mixtures of ethylene glycol, propylene glycol, diethylene glycol, triethylene glycol, 1,3-butylene glycol, 1,4-
An ester obtained by condensing with a dihydric alcohol such as butylene glycol is dissolved in a polymerizable vinyl monomer such as styrene, vinyl toluene, diallyl phthalate, and a curing catalyst and, if necessary, a curing accelerator are added. is used. As the curing catalyst in this case, peroxides such as methyl ethyl ketone peroxide, cyclohexanone peroxide, and benzoyl peroxide are used. Further, as a curing accelerator, cobalt naphthenate, dimethylaniline, etc. are used.

In the method of the present invention, it is necessary to further apply a finishing coat on the glass fiber reinforced resin layer having the above composition. It is preferable to use the unsaturated polyester resin used alone. However, if desired, other impact-resistant resins such as epoxidized asphalt resin, protective mortar, etc. can also be applied.

The standard specification for the method of the present invention consists of three layers: an asphalt epoxy resin layer, a glass fiber reinforced resin layer, and a finishing coat, but other resin layers such as a saturated polyester resin layer or a synthetic rubber layer may be inserted between each layer as desired. Alternatively, a plurality of glass fiber reinforced resin layers may be provided, or another resin layer as described above may be inserted between these layers.

To suitably carry out the method of the present invention, asphalt epoxy resin is applied as an insulating layer on the base concrete at a rate of 0.2 to 1.0 kg/ ^m2 , and then
A layer of a mixture of the unsaturated polyester resin composition and glass fibers, that is, a glass fiber reinforced resin layer is formed. To form this layer, first, an unsaturated polyester resin composition is applied by an appropriate method such as spray coating, roller coating, or brush coating, and then a roving cloth is applied.
You can use the so-called hand lay-up method, in which roving-shaped glass fibers are laid down and the unsaturated polyester resin composition is repeatedly applied until the desired thickness is reached, or the unsaturated polyester resin composition is applied while cutting the rovings. This is done by the so-called spray-up method, in which the product is sprayed with the liquid and then pressed uniformly while defoaming with a roller. This glass fiber reinforced resin layer is formed to have a thickness of 1 to 20 mm depending on the application location, desired strength, etc.

As mentioned above, this layer can optionally be interposed with other plastic layers or, if necessary, with layers of metal, wood or other materials.

Next, the unsaturated polyester resin composition is applied onto the thus formed glass fiber reinforced resin layer by a suitable means such as spray coating, roller coating, brush coating, etc. for finishing. The appropriate amount of resin applied during this finishing is in the range of 0.1 to 1.5 kg/m ² . This finish may be achieved using other impact-resistant resins or may be made into a protective mortar. Furthermore, if necessary, a protective mortar layer can be provided on top of the finishing coat layer of the resin layer.

Effects of the Invention Since the waterproof structure constructed by the method of the present invention is formed independently of the underlying concrete, it is not affected by cracks or damage to the underlying concrete and maintains its complete waterproofing effect for a long period of time. can be held.

The insulation waterproofing method of the present invention can be easily carried out under atmospheric conditions, so it is a method suitable for on-site implementation.

A waterproof structure formed on a concrete base by the method of the present invention will break or break due to cracks and deformation of the base that inevitably occur over a long period of time.
It is extremely stable without deformation, and the glass fiber reinforced resin layer in particular has excellent physical properties such as tensile strength, elastic modulus, and bending strength.It also shows good weather resistance even when used outdoors, and can last for a long time. It is possible to maintain an excellent waterproof effect.

As described above, the construction method of the present invention is highly practical as it solves all the various drawbacks of the various conventional waterproofing methods.

Examples Next, the present invention will be explained in more detail with reference to Examples.

Example 1 0.3 kg/0.3 kg of epoxy primer (manufactured by Fuji Sangyo Co., Ltd., Epoxy Asphalt) was applied to the concrete base.
^m2 to form an insulating layer, and unsaturated polyester (Polylite FH-113, manufactured by Dainippon Ink Chemical Co., Ltd.) was applied to the surface by a roller at a rate of 0.5 m2.
It was applied at a rate of Kg/ ^m2 . Next, glass fiber (manufactured by Nittobo Co., Ltd., Chip Strand Matsuto MC)
-450) was spread at a rate of 450 g/m ² and pressed with a roller, and the same unsaturated polyester was further applied on the top surface with a roller at a rate of 0.5 kg/m ² . All of the above unsaturated polyesters are Polylite FH
-113 was prepared by adding 0.2% of 6% cobalt naphthenate and 1% of methyl ethyl ketone peroxide. Unsaturated polyester resin is kept at room temperature (approximately 20
It was cured after 41 minutes at a temperature of 30°F (°C) to form a glass fiber-reinforced polyester layer. Next, as a finishing coat, unsaturated polyester (Polylite GC-230, manufactured by Dainippon Ink Chemical Co., Ltd.) was applied with a roller at a rate of 0.3 kg/m ² . The waterproof structure obtained in this way maintained a complete waterproof effect for a long period of time.

Example 2 An insulating layer was formed by roller coating (0.5 Kg/m ² ) asphalt epoxy resin (Vitiure Resin P-100, manufactured by Fuji Sangyo Co., Ltd.) on a concrete base, and an unsaturated polyester resin (manufactured by Dainippon Ink Chemical Co., Ltd.) was applied on top of the insulating layer. A material prepared by adding methyl ethyl ketone peroxide as a catalyst to Polylite FH-123 (manufactured by Polylite FH-123) was coated with a roller (1 kg/m ² ), and a glass fiber (Chip Strand Mats MC-450A:
450 g/m ² ) was placed and pressed with a roller, and the same unsaturated polyester was further applied with a roller (0.5 Kg/m ² ). Next, polyester (Toray Acstar C520) was pressed down with a roller, and then the same unsaturated polyester as above was applied again with a roller (0.5 kg/m ² ), and glass fiber (manufactured by Nittobo Co., Ltd., roving cloth WR-570-B) was applied. −100:570
g/m ² ) was placed and pressed down with a roller. Finally, to form a finishing surface layer, the same unsaturated polyester resin as above was applied with a roller at a rate of 1 kg/m ² and cured at room temperature.

[Brief explanation of the drawing]

The figure is a slope view showing the waterproof layer structure formed according to the present invention, and reference numeral 1 in the figure indicates base concrete,
2 is an asphalt epoxy resin layer, 3 is a glass fiber reinforced unsaturated polyester resin layer, and 4 is a finishing coat.

Claims (1)

[Claims] 1. First, an asphalt epoxy resin layer is provided on the base concrete, then a glass fiber layer impregnated with a resin composition containing unsaturated polyester and a curing catalyst is applied thereon, and after curing, a finishing coat layer is applied. This insulation waterproofing method is characterized by forming a waterproof layer with a layered structure independent from the concrete base.