JP2738994B2 - Concrete waterproof structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is capable of imparting excellent waterproofness and mechanical strength to a concrete layer such as a rooftop or a parking lot, and is lightweight and has no cracks. It is about structure.

[0002]

2. Description of the Related Art For example, asphalt waterproof paint and vinyl chloride sheets have been applied to concrete layers such as rooftops and parking lots for the purpose of ensuring waterproofness and weather resistance. In the case of waterproof coating or vinyl chloride sheet attachment, the mechanical strength is low and the deterioration is so severe that the waterproof effect is impaired in a short period of time and frequent maintenance work is required, and the building is heavy and heavy. There is a problem that the load on the load increases.

[0003] Recently, an FR made by impregnating and curing a polyester resin with a glass fiber mat as a core material has been used.
A concrete waterproof structure in which a waterproof layer made of a P composite material is formed on a concrete surface has been developed and is being put to practical use. However, the waterproof structure of concrete made of the FRP composite material using the glass fiber mat as a core material can exhibit excellent mechanical strength, but follows the drying shrinkage of the concrete layer due to the extremely small expansion and contraction rate of the glass fiber mat. Cracks and cracks occur in the dried concrete layer, and at the same time, the glass fiber mat layer is also destroyed, possibly resulting in impaired waterproof performance, and also has poor elasticity. When an impact due to an earthquake or the like is applied, there is a problem that the concrete layer cannot follow the deflection of the concrete layer and may be damaged on the contrary. Further, the glass fiber mat has a relatively high density of about 2.5, and has a problem that it is inconvenient to handle because it is stuck in a finger.

[0004]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned conventional problems and has good responsiveness to shrinkage drying and impact of the concrete layer, thereby preventing the concrete layer from being broken. The present invention has been completed for the purpose of providing a concrete waterproof structure which is excellent in light weight and can be easily handled at the time of work.

[0005]

The concrete waterproofing structure of the present invention, which has been made to solve the above-mentioned problems, has a
Concrete with cleats covered with a plastics waterproof layer
In the waterproof structure of the heat shield, the core material of the waterproof layer is
Using nonwoven fabric consisting of mid fiber and allyl synthetic fiber
It is characterized by the following.

In the present invention, aramid fibers and aryl synthetic fibers are used instead of conventional glass fiber mats.
It is characterized by the fact that sheet-shaped nonwoven fabric is used as a core material , and exhibits excellent tensile strength and toughness not found in conventional glass fiber mats, and is also expected to have extremely high impact strength. is there.

Further, to a sheet-like nonwoven fabric thus made of aramid fibers and Aruriru synthetic fibers
In addition, heat resistance, acid resistance, alkali resistance, weather resistance, and the like can be further improved. In this case, the acrylic synthetic fiber has, for example, a fiber length of about 50 to 80 mm and a tensile strength of about 4 to 12 g / d, which is almost the same as that of nylon or vinylon staples. Also 10 ~
Those having a sufficient elongation of 25% can be used. The aramid fiber and the acrylic synthetic fiber of the nonwoven fabric are in a weight ratio of aramid fiber: acrylic synthetic fiber = 5: 95 to 1
It is preferable to mix within the range of 5:85, for example,
Acrylic resin binder is added and unit weight 120g /
m ² and a non-woven fabric having a thickness of about 1 to 3 mm. Here, if the mixing amount of the aramid fiber is less than 5% by weight, it is difficult to exert sufficient mechanical strength on the nonwoven fabric, while if it is more than 15% by weight, the cost tends to be high. Also, there is a tendency that no significant improvement in tensile elongation is observed. The obtained nonwoven fabric has a density of about 1.1 to 1.3, which is less than half the density of a conventional glass fiber mat (about 2.5), and has excellent light weight. The non-woven fabric obtained in this manner is, for example, laid on a concrete roof, impregnated with a softened polyester resin, cured for a certain period of time, and cured to form a plastic-based waterproof layer on the concrete surface. Should be formed.

Referring to the drawings, the nonwoven fabric 1 is laid on the surface of a concrete base material 2 via a primer layer 3 made of a polyester primer as shown in FIG. A conventional glass fiber mat 4 is laid to increase the mechanical strength, and then the top coat layer 5 is formed. In addition, the impregnation of the nonwoven fabric 1 and the glass fiber mat 4 with the soft polyester resin may be performed in the previous step or may be impregnated and cured at the time of construction. Needless to say, two or three or more sheets can be used for heavy walking and not used for light walking, and can be arbitrarily combined depending on the use.

Such a concrete waterproofing structure comprises a plastics-based waterproofing layer in which a sheet-like nonwoven fabric using aramid fiber is used as a core material and impregnated and cured with a soft polyester resin or the like. Unlike conventional glass fiber mats, the non-woven fabric itself has an elasticity of 10% or more, so it can sufficiently follow the drying shrinkage of the concrete layer. Even if the non-woven fabric itself is not torn, and it has excellent elasticity, it can sufficiently follow the deflection of the concrete layer even when an impact such as an earthquake is applied, causing the concrete layer to break. I won't let you. Furthermore, unlike a glass fiber mat, it does not pierce fingers, and the density of one woven fabric is as small as about 1.2 and it is excellent in light weight, so it is easy to handle at the time of work. It is well compatible with resin and can exhibit excellent workability.

Further, as described above, in addition to using a sheet-like nonwoven fabric using aramid fiber as a core material of a plastics-based waterproof layer, a synthetic rubber-based material such as butyl rubber or the like already laid as a waterproof layer is used. When repairing a synthetic resin-based waterproofing layer such as vinyl chloride resin, lay a nonwoven fabric on the deteriorated vinyl chloride resin layer without peeling it off, and impregnate and cure it with a soft polyester resin etc. In this case, there is an advantage that the repair work can be performed in a short time without the necessity of stripping and discarding the vinyl chloride resin layer and the like.

[0011]

Example: 90% by weight of acrylic synthetic fiber (manufactured by Toray Industries, Inc .: trade name "Atran") and aramid fiber (Dupont
Toray Kevlar Co., Ltd .: Product name “Kevlar 29”) 10
% By weight and mixed with an acrylic binder to form a non-woven fabric having a unit weight of 120 g / m ² and a thickness of 1.5 mm. The non-woven fabric was used as a core material, impregnated with a soft polyester resin, and cured for 7 days. A waterproof layer was formed. Further, a waterproof structure made of a FRP composite material using a nonwoven fabric of glass fiber mat having a unit weight of 380 g / m ² and a thickness of 1.0 mm as a core material was formed on the waterproof layer to form a waterproof structure of concrete. The results are as shown in Table 1. The two layers shown as comparative examples have almost the same tensile strength as the waterproof structure of concrete made of FRP composite material using a nonwoven fabric of glass fiber mat as a core material, but have an elongation. The rate was confirmed to be much better. In addition, using a non-woven fabric having a unit weight of 120 g / m ² and a thickness of 1.5 mm made of the aramid fiber, repair work of the waterproof layer made of the existing vinyl chloride resin was performed. The layer is affixed with an aramid fiber non-woven fabric via an adhesive without peeling, and impregnated with a soft polyester resin to form a waterproof layer. Obtained.

[0012]

[Table 1] ┌───────────────┬─────┬─────┐ │ │ Example │ Comparative Example │ ├───────┬ │ | I. Physical tests │ tensile strength │ 212 │ 280 │ │ │ ( Kg / cm 2) │ │ │ │ ├───────┼─────┼─────┤ │ │ elongation (%) │ 12 │ 3 │ │ │ │ │ │ │ ├───────┼───────┼─────┼─────┤ │ II. Zero span | Breaking load (Kg) | 409 | 440 | │ Test │ │ │ │ │ (tensile speed ├───────┼─────┼─────┤ │ 5 mm / min) │ elongation (Mm) │ 4.7 │ 1.5 │ │ │ │ │ │ │ └───────┴───────┴─────┴─────┘

[0013]

As is clear from the above description, the present invention is excellent in shrinkage and can sufficiently follow the shrinkage and drying of the concrete layer and can reliably prevent the occurrence of cracks and cracks in the sheet itself. In addition, it has excellent elasticity and can follow the deflection of the concrete layer when an impact is applied, preventing the concrete layer from breaking.In addition, it is also lightweight and easy to handle at the time of work. Is what you can do. Therefore, the present invention greatly contributes to the development of industry as a concrete waterproof structure that has solved the conventional problems.

[Brief description of the drawings]

FIG. 1 is a partially cutaway perspective view showing a construction example of the present invention.

[Explanation of symbols]

 1 Non-woven fabric 2 Concrete substrate

Claims (4)

(57) [Claims] 1. Concrete is made of plastics waterproofing
In the concrete waterproof structure covered with layers, the waterproof
Aramid fiber and Aryl synthetic fiber as core material of layer
Concrete protection characterized by using nonwoven fabric
Water structure. 2. A mixture of aramid fiber and acrylic synthetic fiber.
Acrylic based on aramid fiber 5 to 15 in weight ratio
The core according to claim 1, wherein the synthetic fiber is in the range of 95 to 85.
Concrete waterproof structure. 3. The waterproof layer is made of synthetic rubber or synthetic resin.
3. The method according to claim 1, wherein
Concrete waterproof structure. 4. The waterproof layer is a FRP composite material.
The concrete according to claim 1 or claim 2,
Waterproof structure.