KR101129512B1 - Water tank that concrete inside is strengthening - Google Patents

Abstract

PURPOSE: A water tank with a reinforced inner concrete surface is provided to secure strong adhesion and superior waterproof effect of coating on the inner surface of a water tank. CONSTITUTION: A water tank with a reinforced inner concrete surface comprises a primer layer(120), a polyurethane foam layer(130), a first polyurea layer(140), and a second polyurea coating layer(150). The primer layer is formed by removing foreign materials and arranging the inner surface(110) of a water tank(100) and spraying primer to the thickness of 50μm. The polyurethane foam layer is formed by spraying polyurethane foam to a thickness of 10-15mm at a density of 50±1.5kg/cm^3. The first polyurea layer is formed by spraying polyurea to the thickness of 2.0mm on the surface of the polyurethane foam layer after drying the polyurethane foam layer for one day. The second polyurea coating layer is formed by spraying polyurea to the thickness of 50μm on the surface of the first polyurea layer.

Description

Water tank that concrete inside is strengthening}

The present invention relates to a water reservoir reinforced with an inner concrete surface, in particular a primer, polyurethane foam (elastic urethane resin), polyurea, on the surface of the inner tank of the water tank made of concrete for storing the drainage basin, sedimentation tank, drinking water reservoir, drinking water It is composed of sequential lamination by polyurea finish coating material, and the existing method for coating the underground reservoir was not suitable for application due to peeling and scale and discoloration. In order to solve this problem, there is no mold and moss on the coated surface by providing excellent functionality, there is no crack and peeling between the middle and the top, and there is no change over time in the water under the coating film. It relates to a reservoir with reinforced concrete inner surfaces.

In general, the coating film for protecting the water tank structure has good compressive strength, and has excellent properties of elasticity, acid resistance, alkali resistance, chemical resistance, and ozone resistance.

However, concrete structures that are not coated are subject to deterioration in strength, leakage and buried reinforcement by materials containing impurities such as organics, acids, alkalis, inorganic salts, etc., as the use time elapses, further reducing the durability of the structures. The problem arises.

In addition, the concrete structure has a certain degree of water tightness, but cracks are generated inside and outside the structure due to micro cracks and irregularities caused by irregularities during curing, and cracks caused by external force transmitted from the outside. Occurs, this leak further exacerbates the cracks and impairs the function of the concrete structure in the future.

STS (Stainless) lining, PE (Polyethylene) lining, etc. can be damaged in concrete structure by planting anchors in the structure, and the concrete structure can be damaged. In particular, factors that may shorten the life of the structure have been pointed out, especially when the rebars are exposed to moisture. In addition, even when waterproofing polyurea, the existing method is not suitable for application due to peeling and staining and discoloration.

In general, the most widely used resin for forming a coating film for imparting acid resistance and water resistance to concrete structures is epoxy resin or unsaturated polyester resin. In particular, unsaturated polyester-based resin is used in a tank tank in which acid resistance is required as FRP (Fiberglass Reinforced Plastics) resin, which is used together with glass fiber.

These epoxy resins and FRP resins have been used in the waterproofing method of forming a coating film on the concrete surface in order to protect and waterproof the concrete of the storage tank is excellent acid resistance.

Especially reservoir. Drainage. In the drinking water tank, the coating method using the epoxy resin is used, and the anticorrosive coating film has a strong coating film strength and low elastic elongation, so it is inappropriate to be applied to the concrete water tank structure in which the crack occurs due to the continuous and repeated shrinkage / expansion of concrete. . That is, the anticorrosive coating film formed of the epoxy resin has a problem that the shrinkage / expansion activity of the concrete structure and the resistance to cracking are reduced and the coating film is cracked and peeled together with the crack of the concrete structure.

On the other hand, as a prior art, Korean Patent Application No. 10-2001-0075472 (application date: November 30, 2001) discloses a "polyurea waterproofing method", it will be described with reference to FIG.

In the polyurea waterproofing method according to the conventional patent, in the polyurea waterproofing method of spraying polyurea to the foundation member at the construction site, the nail member 60a and washer 60b are placed on the foundation member 10 with the nonwoven fabric 20 as a reinforcing member. Reinforcing member fastening step of fastening the nonwoven fabric 20 to be fixed to the base member 10 by using; Polyurea spray coating step of spraying polyurea (50) on the reinforcing member is fixed to the nonwoven fabric 20: Polyurea drying to allow the spray-coated polyurea (50) by natural drying at room temperature for 20 to 30 seconds The polyurea 50 is composed of amine-terminated, polyether resin, amine ring extension, and MDI prepolymer.

However, such a conventional polyurea waterproofing method has disclosed a method of using a nail or washer to fix the nonwoven fabric used as the reinforcing member to the waterproof base surface before spray coating the polyurea. In this method, by using nails or washers as a fixing means, there is a risk of damage to the waterproof structure during the fixing process. There was a problem.

The present invention has been made in view of the above problems, the primer, polyurethane foam or elastic urea resin, polyurea, poly on the surface of the inner tank of the water tank made of concrete for storing the drainage basin, sedimentation tank, drinking water reservoir, drinking water When coated on the surface by sequential lamination by urea finish, it protects the surface by strong adhesive force and gives excellent waterproofness by coating, so there is no mold and moss on the coating surface, there is no cracking of concrete, and the coating film in water There is no change over time according to the passage of time, and the purpose is to provide a reservoir with reinforced concrete inner surface which is inexpensive and semipermanently possible.

In the water reinforcing tank disclosed in the embodiment of the present invention, the surface tank for removing and leveling foreign substances on the surface of the water tank concrete structure after the reinforcement is sprayed with a primer on the surface of the water tank of the water tank with a thickness of 50 μm. A primer layer to be pretreated; A polyurethane foam layer laminated on the primer layer by spray spraying a polyurethane foam having a density of 50 ± 1.5 kg / cm ³ to a thickness of 10 to 15 mm; After drying the polyurethane foam layer for one day, the primary polyurea layer is laminated by spray spraying the polyurea to 2.0mm thickness on the surface of the polyurethane foam is dried; Characterized in that it consists of a secondary polyurea coating layer to finish coating by spray spraying 50㎛ thickness on the surface of the primary polyurea layer.

Preferably, the water tank further comprises a repair coating to the existing epoxy coating layer formed on the concrete structure.

Preferably, each lamination on the surface of the water tank concrete inner tank includes spraying and drying.

Preferably, the polyurea finish includes an antimicrobial.

Preferably, the method further includes applying an elastic polyurethane resin with a thickness of 1 mm according to the surface condition of the water tank after applying the primer.

Preferably, the primary polyurea layer and the secondary polyurea layer is characterized in that it is suitable as a concrete water tank having antimicrobial properties to store drinking water.

Preferably, select the surface from the surface cleanup and waterproof work on the pipe part connected to the inside, and the corrosion and aging parts of the pipe and waterway by surface treatment or dismantling by grinding, and the replacement and bending and repairing of the STS material It is characterized by repairing by cutting, argon welding and the like.

According to the present invention, the surface of the water tank, the sedimentation tank, drinking water storage tank, the inner tank of the water tank made of concrete for storing drinking water is coated with the surface by the sequential lamination by primer, polyurethane foam, polyurea surface by strong adhesion It has the effect of providing excellent water resistance by protecting and coating.

In addition, by coating the polyurea top finish material, there is no mold and moss on the coating surface, and there is no crack or peeling between the primary polyurea layer and the finishing material which has been pointed out as a problem, and it is resistant to chlorine and ozone and the coating film in water There is no change over time, and the unit price is lower than that of STS and PE materials, and it can be used semi-permanently.

In addition, there is an effect that can be repaired coating on the epoxy coating layer coated on the concrete of the water tank.

In addition, by checking the piping connected to the inside of the water tank during the reinforcement of the water reinforcement, it checks whether there is an abnormality in waterproofing at the connection part and repairs it when the aging of the pipes and the waterway proceeds, thereby enhancing the effect of remodeling the water tank.

1 is a concrete structure constructed by a conventional polyurea waterproof method.
Figure 2 is a cross-sectional perspective view showing a structure consisting of a reservoir reinforced with the concrete inner surface according to the present invention.
Figure 3 is a cross-sectional view showing a structure consisting of a reservoir reinforced with the concrete inner surface according to the present invention.
Figure 4 is a flow chart for explaining a reservoir reinforced with concrete inner surface according to the present invention.
Figure 5 is a cross-sectional view showing another embodiment of the water tank reinforced concrete inner surface according to the present invention.

The present invention for achieving the above object,

After surface removal to remove and planarize foreign substances on the surface of the tank inside the concrete structure,

A primer layer for pretreatment by spray-spraying a primer to a thickness of 50 μm on the inner tank surface of the water tank;

A polyurethane foam layer laminated on the primer layer by spray spraying a polyurethane foam having a density of 50 ± 1.5 kg / cm ³ to a thickness of 10 to 15 mm;

After drying the polyurethane foam layer for one day, the primary polyurea layer is laminated by spray spraying the polyurea to 2.0mm thickness on the surface of the polyurethane layer is dried;

It was achieved by providing a water reinforcing tank reinforced with a concrete inner surface, characterized in that the secondary polyurea coating layer consisting of a spray coating to the primary polyurea layer surface spray coating 50㎛ thickness.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Prior to this, terms or words used in the present specification and claims should not be construed as being limited to the common or dictionary meanings, and the inventors should properly explain the concept of terms in order to best explain their own invention. Based on the principle that can be defined, it should be interpreted as meaning and concept corresponding to the technical idea of the present invention.

Therefore, the embodiments described in the specification and the drawings shown in the drawings are only one of the most preferred embodiments of the present invention, and do not represent all of the technical idea of the present invention, they can be replaced at the time of the present application It should be understood that there may be various equivalents and variations.

The When the water tank with reinforced concrete surface is coated on the surface by sequential lamination by primer, polyurethane foam, and polyurea on the surface of the inner tank of the water tank 100 made of concrete for storing drainage, sedimentation tank, drinking water reservoir, and drinking water It protects the surface by strong adhesive force and gives excellent waterproof property by coating, so that there is no mold and moss on the coated surface, there is no cracking of concrete, and the coating film in water does not change with time, and the unit price is low Semi-permanently possible.

2 to 4, the water reservoir reinforced with the concrete inner surface according to the embodiment of the present invention is composed of a surface clean, primer layer, polyurethane foam layer, drying, primary polyurea layer, secondary polyurea coating layer.

First of all, surface cleansing removes dust, oil, dirt, etc. from the surface 110 of the water tank 100 inside the concrete tank by brushing, and thoroughly removes various debris and dust by performing high pressure washing.

In this operation, the contaminants on the surface 110 must be completely removed, and the removal of the contaminants requires high pressure air, etc., so that it takes a lot of time to dry the moisture so that the air is not delayed.

That is, to remove the lead portion in order to ensure the uniformity of the waterproof coating, to remove dust, oil, water, etc. that can weaken the adhesion between the concrete surface 110 and the polyurea resin, and cracks, floors and walls If there are intersecting weak spots or pipes, repair and reinforce them with polyurethane foam. This pretreatment causes the concrete structure to have a high adhesion with the primers formed thereafter.

Here, in the cleanup of the surface 110, the surface 110 is selected and the waterproofing process is performed on the pipe part connected to the inside, and the process of surface treatment or dismantling of the corroded or aged parts such as the pipe and the waterway by grinding is replaced. It is repaired by bending, cutting, argon welding, etc. when repairing stainless steel (STS) material with excellent weldability.

After the cleanup operation of the surface 110 as described above, the primer layer 120 is formed on the inner tank surface 110 of the water tank 100.

The primer layer 120 is sprayed by a primer to form a 50㎛ thickness.

The primer to be applied is selected as the most suitable according to the type and condition of the base surface.

In the present invention, the primer uses high density polyurea (High Density Polyurea) HDPU-100.

It is preferable to use the product of the above primer, but the present invention is not limited thereto.

The primer layer 120 is formed with a base material to improve adhesion to the concrete surface 110.

Next, the polyurethane foam layer 130 is laminated by spraying a polyurethane foam having a density of 50 ± 1.5kg / cm ³ to a thickness of 10 to 15mm on the surface of the primer layer 120.

In addition, when the thickness of the polyurethane foam is 5mm or less, there is a fear of leakage, and when the thickness is 15mm or more, the overall thickness is thick and cost problems arise, so the thickness is preferably 10 to 15mm.

Here, the polyurethane foam (polyurethane foam) applied to the present invention is a synthetic polymer having a urethane bond (-NH-CO-), for example, by the polymerization reaction of diisocyanate and polyol, foam for low temperature insulation, retort, composite It is used as an adhesive for film (laminate).

The coating film dried as the polyurethane foam waterproofing coating has an elastic force, and the structure is excellent in endurance when shrinking and expanding due to temperature difference and vibration, thereby preventing moisture from penetrating into the cracked portion. It can be called a material having excellent cold resistance and durability.

In the present invention, polyurethane foam HDPU-super foam is used.

Although it is preferable to use the product of the said polyurethane foam, this invention is not limited to this.

That is, as shown in FIG. 5, after the primer layer 120 is applied to the concrete surface 110, the elastic polyurethane resin HDPU-200 is applied in a thickness of 1 mm instead of the polyurethane foam layer 130 according to the state of the water tank surface 110. By doing so, the elastic polyurethane resin layer 160 may be formed.

On the other hand, after applying the polyurethane foam layer 130 is dried for 1 day.

As such, the polyurea is spray-sprayed to a thickness of 2.0 mm on the surface of the polyurethane foam layer 130 in a dried state and laminated to the primary polyurea layer 140.

In the present embodiment, the primary polyurea layer 140 is formed by spray coating to have a thickness of 2.0 mm. If the formed thickness is less than 2.0mm, sufficient chemical resistance and waterproofness cannot be imparted to the concrete surface 110, and if the thickness is more than 2.0mm, an increase in cost is caused by application more than necessary.

In the present invention, the primary polyurea HDPU-300 is used.

Although it is preferable to use the product of the said primary polyurea, this invention is not limited to this.

In addition, a coating is completed by forming a second polyurea layer 150 spray-coated on the surface of the first polyurea layer 140 with a thickness of 50 μm to form a top coating.

Secondary polyurea HDPU-303 for finishing coatings in the present invention is used.

It is preferable to use the product of the secondary polyurea, but the present invention is not limited thereto.

At this time, the secondary polyurea layer 150 coated on the primary polyurea layer 140 is suitable for a water tank 100 made of concrete having antibacterial properties and storing drinking water.

On the other hand, the polyurea (polyurea) is a polyisocyanate prepolymer (polyisocyanate prepolymer) and a polyamine (polyamine) mixture as a curing agent, a polyurea elastomer (polyurea elastomer) is formed by the two-component reaction of the main agent and the curing agent.

As a feature of the polyurea resin, it is a non-catalytic ultra-fast curing type that has gel time within 3 to 5 seconds after spraying, so that it can be sprayed on a slope and a vertical surface without flowing down, and the drying time is within 30 seconds and during construction It is almost unaffected by temperature and is less affected by climate change, humidity, heat and cold. (Applicable temperature: -40 ° C to + 135 ° C).

In addition, the two-component 100% solids can be sprayed in a 1: 1 volume ratio without the use of solvents or diluents. And it can be prepared from the elastic body having a variety of physical properties and soft to hard elastomer.

In addition, it has excellent physical properties including tensile strength, elongation, abrasion resistance, and adhesive strength, and shows high thermal stability even at temperatures up to 177 ° C (mainly aromatic polyurea resins).

Here, the primer tank 120, the polyurethane foam layer 130, the primary polyurea layer 140, the secondary polyurea layer (approximately applied to each of the water tank 100, the concrete inner tank surface 110) 150) All the application is sprayed and dried.

On the other hand, it will be described below with respect to the polyurea resin used in the present invention.

Composition of Polyurea Resin division subject Hardener ingredient Prepolymer Synthesizing Isocyanate and Polyol Amine Mixture Viscosity (25 ℃) 550 to 650 cps 500 to 600 cps Specific gravity (25 ℃) 1.13 ± 0.01 1.00 ± 0.01

In addition, the physical properties of the polyurea resin is shown in Table 2 below.

Configuration standard The tensile strength 175kgf / cm ² Elongation Rate (25 ℃) More than 350% Hardness 50 ± 5 shore D Hardness 90 ± 5 shore A Weatherability Withstand more than 2000 hours Effective total temperature -50 ℃ to 150 ℃ Abrasion Resistance (1kg, 1000rev, H18wheels) 45mg or less

As can be seen in Table 2, the polyurea resin is excellent in water resistance and chemical resistance to form a flexible yet smooth membrane, and may form embossing to prevent slipping and aesthetic appearance on the surface according to the injection method, the use of a catalyst Without reactivity and curing rate is very fast, the reactivity is uniform characteristics.

On the other hand, the water reservoir reinforced with the concrete inner surface of the present invention has the advantage that can be repaired coating on the concrete structure of the water tank applied with the existing epoxy coating layer.

Although described and illustrated with respect to some embodiments for illustrating the technical idea of the present invention, the present invention is not limited to the configuration and operation as described and described as such, and deviate from the scope of the technical idea It will be appreciated by those skilled in the art that many modifications and variations can be made to the present invention without departing from the scope of the invention. And all such modifications and changes as fall within the scope of the present invention are therefore to be regarded as being within the scope of the present invention.

100: water tank 110: surface
120: primer layer 130: polyurethane foam layer
140: 1st polyurea layer 150: 2nd polyurea layer
160: elastic polyurethane resin layer

Claims (7)

After surface removal to remove and planarize foreign substances on the surface of the water tank inside the concrete structure of the water tank,
A primer layer for pretreatment by spray-spraying a primer to a thickness of 50 μm on the inner tank surface of the water tank;
A polyurethane foam layer laminated on the primer layer by spray spraying a polyurethane foam having a density of 50 ± 1.5 kg / cm ³ to a thickness of 10 to 15 mm;
After drying the polyurethane foam layer for one day, the primary polyurea layer is laminated by spray spraying the polyurea to 2.0mm thickness on the surface of the polyurethane foam layer is dried;
Reinforced concrete reservoir with a concrete inner surface, characterized in that the secondary polyurea coating layer consisting of a spray coating to the primary polyurea layer surface spray coating 50㎛ thickness.
The method of claim 1,
Reservoir tank reinforced by the concrete inner surface further comprises a repair coating to the existing epoxy coating layer formed on the concrete structure of the water tank.
The method of claim 1,
Each reservoir on the surface of the concrete tank inside the water tank concrete is reinforced with a concrete inner surface comprising spraying and drying.
The method of claim 1,
The polyurea,
Reservoir with reinforced concrete surface including antibacterial and ozone resistance.
The method of claim 1,
After the primer is applied according to the surface of the water tank, the concrete inner surface reinforced water storage tank further comprises applying an elastic polyurethane resin 1mm thick.
The method of claim 1,
Reinforced concrete inner surface of the concrete tank, characterized in that the primary polyurea layer and the secondary polyurea layer coating is suitable as a concrete water tank for storing drinking water having antibacterial properties.

The method of claim 1,
Select the surface from the surface cleanup and waterproof work on the pipe part connected to the inside, and the corrosion or aging parts such as pipes and waterways by surface treatment or dismantling by grinding, and bend and cut when repairing STS materials, Reservoir with reinforced concrete inner surface, characterized in that repair by argon welding.

Images