KR102021576B1 - Enhanced water-dense inner smooth double-wave steel pipe - Google Patents

Abstract

The present invention relates to a double-wave steel pipe of a coated steel sheet formed to have a uniform surface therein, wherein a watertight member is added to a binding portion of the inner surface smooth steel sheet, and the watertight member is formed as an integral surface by combining with an inner surface coating layer of the smooth steel sheet to be bonded to each other. The coating layer of the inner steel sheet is made of poly viny choride (PVC)-Sol, and the watertight member comprises 20 to 40 wt% of polyvinyl chloride, 25 to 35 wt% of acetone, 15 to 25 wt% of toluene, and 5 to 10 wt% of methyl ethyl ketone.

Description

{Enhanced water-dense inner smooth double-wave steel pipe}

The present invention relates to a coated inner smooth double corrugated steel pipe having improved watertightness, and more particularly, to a corrugated steel pipe of an inner smooth double corrugated steel pipe coated with PVC (Poly Viny Choride) -Sol. Adds a watertight material that is formed as an integral surface by chemically bonding with the inner surface coating layer of the smooth steel plate, and prevents water leakage from the binding part, and prevents leakage through the gap of the binding part and inflow of external water by removing the groove part of the binding part. The present invention relates to an internally smooth double corrugated steel pipe having an improved watertight coating layer.

Drainage structures buried underground to treat rainwater and sewage are mainly used for concrete fume pipes, concrete pipes, PC boxes, etc., but the lack of resources for raw materials, subsidiary materials, productivity and constructability, and damage And damage occurred.

To solve these problems, PVC (Poly Viny Choride) -Sol coated steel sheet is manufactured and replaced by spiral corrugated steel pipe. At this time, corrugated steel pipe is a product made by corrugating steel plate coated with PVC (Poly Viny Choride) -Sol to increase rigidity and then spirally piped. It is structurally safe and durable and resistant to corrosion, breakage and damage. Its long life, high productivity and high workability make it widely used in various civil engineering fields.

Conventional corrugated steel pipes are formed by bending a wave shape on a steel sheet coated with PVC-Sol to provide a more durable corrugated steel pipe due to various environmental changes and site conditions, and then spirally forming the formed steel sheet. Because the corrugated steel pipe manufactured by folding and binding the left and right sides of the steel plate while being wound together is composed of a continuous waveform of bone and acid, the inner diameter of the corrugated wave acts as a factor that hinders the flow of the fluid. A manufacturing method including an inner tube having a uniform surface inside a corrugated outer tube, and a coupling part for bending and joining both ends of the inner and outer tubes to overlap each other. The inner and outer surfaces are coated with PVC-Sol to improve durability. And, it uses a corrugated steel pipe with a smooth inner surface to smooth the flow of fluid,

The internal smooth double corrugated steel pipe coated with PVC-Sol is a corrugated steel pipe that is lightweight, easy to handle, and easy to assemble and install, but is used as a drainage pipe for rainwater and sewage. In this case, as time elapses, minute deformation occurs at the joint of corrugated steel pipe due to earth pressure and settlement, and leakage occurs between the cracks, or problems due to inflow of groundwater or leachate into the corrugated steel pipe. Doing.

In order to solve this problem, a solid water-tight material is inserted into the joint or a synthetic resin adhesive is applied, but as time passes, the watertight material or the synthetic resin is peeled off from the coating layer coated with the water-tight material, and thus, satisfactory leakage preventing effects are not obtained.

Applicant has developed an adhesive that is organically bonded to the PVC-Sol layer, which is a coating layer of steel sheet to solve this problem, and confirmed that the water-tightness of the bonding portion is improved by a simple process to complete the present invention.

Republic of Korea Patent Registration No. 10-1847987 Republic of Korea Patent Registration No. 10-1229116

The present invention has been made to solve the above problems, the object of the present invention is a method of manufacturing a corrugated steel pipe improved water-tightness by applying a water-tight material to the internal smooth double corrugated steel pipe having a coating layer used as drainage pipe of rainwater and sewage. More specifically, the watertight material is formed on the binding portion of the internal smooth double corrugated steel pipe having a coating layer used as drainage pipes of rainwater and sewage, which is chemically bonded with the coating layer to form an integral surface. It is an object of the present invention to provide an internal smooth double corrugated steel pipe having an improved watertight coating layer that prevents leakage and prevents leakage of water through a gap of the binding portion and prevents inflow of external water by removing the groove of the binding portion.

In addition, by forming a coating layer coated on the inner and outer circumferential surface of the corrugated steel pipe to be organically combined with the watertight material to be applied together with corrosion resistance, durability, chemical resistance, and abrasion resistance to improve the watertightness of the joint portion coated with watertight material Another object is to provide a double corrugated steel pipe.

The above object is, the outer circumferential surface is formed into a spiral bent by bending the coated outer steel plate in a wave form, the inner circumferential surface is wound into a spiral by winding the inner steel sheet provided with a coating layer to form a smooth portion, the left and right ends of the laminated joints are combined and bonded In the double corrugated steel pipe of the coated steel sheet having a portion formed to have a uniform surface therein, a watertight member is added to the binding portion of the inner surface smooth steel sheet, the watertight member is the inner surface coating layer of the smooth steel sheet bonded to each other And a coated inner smooth double corrugated steel pipe, characterized in that it is formed into an integral surface in combination with the.

In addition, the coating layer of the inner steel sheet is characterized in that made of PVC (Poly Viny Choride) -Sol.

In addition, the water-tight material is characterized in that it comprises 20 to 40 wt% of polyvinyl chloride (POLY VINYL CHLORIDE), acetone, toluene.

In addition, the water-tight material is characterized in that it further comprises acetone 25 ~ 35 wt%, toluene 15 ~ 25 wt%, methyl ethyl ketone (METHYL ETHYL KETONE) 5 ~ 10 wt%.

In addition, the watertight material is characterized in that it further comprises 5% to 15% of cyclohexanone (cyclohexanone).

In addition, polyvinyl chloride is characterized by hybridization of at least one of styrene resin, vinyl acetate, methyl acrylate, vinylidene chloride and the like.

In addition, the watertight material is formed by injecting into the coupling portion using a liquid quantitative ejector after the process of forming the coupling coupling portion.

In addition, the coating layer of the inner steel sheet is at least one selected from polyester resin, fluorine resin, vinyl chloride resin (PVC), epoxy resin, urethane resin and acrylic resin 20 to 75 wt%, solvent 5 to 60 wt%, 3 to 15 wt% of the dispersion, and 2 to 5 wt% of calcium and zinc-based stabilizers.

The groove part of the binding part is removed by a watertight material chemically bonded to the coating layer and formed as an integral surface of the binding part of the internal smooth double corrugated steel pipe provided with the PVC-Sol coating layer according to the present invention, and the gap of the binding part is removed. It prevents leakage of water and inflow of external water, and shows the effect of perfect water tightness.

1 is a block diagram of an internal smooth double corrugated steel pipe according to the related art.
Figure 2 is a cross-sectional view of the binding portion to which the watertight agent of the internal smooth double corrugated steel pipe according to the prior art is applied.
Figure 3 is a schematic diagram showing the inner surface PVC coated bundling of the internal smooth double corrugated steel pipe according to the prior art.
Figure 4 shows a schematic view of a conventional watertight material is applied to the binding portion of the inner smooth double-corrugated steel pipe according to the prior invention and bonded.
Figure 5 shows a schematic view of the water-tight material is applied to the binding portion of the inner smooth double-corrugated steel pipe according to the present invention combined with the PVC-Sol coating layer.
Figure 6 shows a leak state shown in the photograph of the binding portion of the internal smooth double-corrugated steel pipe according to the present invention.
Figure 7 shows the result of the water-tight material is applied to the binding portion of the internal smooth double-corrugated steel pipe according to the invention completely improved watertightness in the photograph.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. In this process, the thickness of the lines or the size of the components shown in the drawings may be exaggerated for clarity and convenience of description. In addition, in the description of the present invention, descriptions of already known functions or configurations will be omitted to clarify the gist of the present invention.

In addition, in describing the present invention, terms indicating directions are described to enable those skilled in the art to clearly understand the present invention and indicate relative directions, and the following terms are defined in consideration of functions in the present invention. As terms, this may vary depending on the intention or convention of the user or operator. Therefore, the definitions of these terms should be made based on the contents throughout the specification.

In addition, the following examples are not intended to limit the scope of the present invention but merely illustrative of the components set forth in the claims of the present invention, which are included in the technical spirit throughout the specification of the present invention and constitute the claims Embodiments that include a substitutable component as an equivalent in the element may be included in the scope of the present invention.

1 is a block diagram of an internal smooth double corrugated steel pipe according to the related art.

Referring to Figure 1, the coated inner smooth double-corrugated steel pipe according to the present invention, the outer circumferential surface 11 is bent into the coated outer steel plate to form a spiral bent, the inner circumferential surface 12 is an inner steel sheet having a coating layer A state diagram having a partial cross-section and appearance of a double corrugated steel pipe of a coated steel sheet formed to have a uniform surface therein with a coupling part 13 formed by winding a spiral to form a smooth part and folding and binding the left and right ends of the stacked parts. Is shown.

As shown in FIG. 3, the inner surface of the coupling part 13, in which the left and right ends of the outer peripheral surface having the corrugated portion and the inner surface having the flat end are stacked and bound, has both ends rounded and deep grooves in the center. .

The grooves formed in this way have a watertightness by compressing and coating the coating layer coated with PVC-Sol at the beginning of bonding.However, when the corrugated steel pipes are laid underground, the corrugated steel pipes may be damaged due to earth pressure and settlement. The micro-deformation occurs in the coupling part, causing leakage between the deformed gaps, or the problem caused by the inflow of groundwater or leachate into the corrugated steel pipe, and as shown in FIG. If a simple watertight agent is applied to the joint where the left and right ends of the surface are laminated and bound, the coating agent and the coating layer are not fused, but are hardened only in the grooves, and when the corrugated steel pipe is buried under the ground, earth pressure and sinking occur as time passes. Microscopic deformation occurs at the joint of the corrugated steel pipe due to the action, and leakage occurs between the cracks. B, the problems caused by the inflow of groundwater or leachate into the corrugated steel pipe, and in order to solve this problem, an adhesive that is organically bonded with the PVC-Sol layer of the steel sheet has been developed.

As shown in FIG. 5, the watertight material developed on the inner surface of the coupling part 13, in which the left and right ends of the outer peripheral surface having the corrugated portion and the inner surface having the flat end are stacked, is applied and coated as shown in FIG. 4. It can be seen that the surface layer of the PVC-Sol layer, which is a coating layer of the steel sheet, is melted by the watertight material, mixed with the watertight material, and welded.

The watertight material includes 20 to 40 wt% of polyvinyl chloride, acetone, toluene, and the watertight material is 25 to 35 wt% of acetone, 15 to 25 wt% of toluene, and methyl ethyl ketone (METHYL). ETHYL KETONE) 5 to 10 wt% more.

In addition, the water-tight material further comprises 5% to 15% of cyclohexanone, the polyvinyl chloride is characterized in that the hybridization of at least one of styrene resin, vinyl acetate, methyl acrylate, vinylidene chloride and the like. do.

The polyvinyl chloride used in the watertight material according to the present invention hybridizes one or more of styrene resin, vinyl acetate, methyl acrylate, vinylidene chloride, and the like, and these are polyvinyl chloride ( POLY VINYL CHLORIDE) is preferably 20 to 40 wt%. If the content of the polyvinyl chloride resin is less than 20% by weight, the durability of the coating film is lowered. If the content of the polyvinyl chloride resin is more than 40% by weight, the resin content in the water-tight material is too large, there is a problem that the flexibility of the coating film is lowered.

In addition, the solvent of the water-tight material contains an appropriate amount of solvent in consideration of the ease of handling and the characteristics of the coating operation, and includes acetone, toluene, methyl ethyl ketone as a solvent.

Thus, the surface layer of the PVC-Sol layer, which is a coating layer of the steel sheet, is melted and mixed with the watertight material by welding the watertight material coated by the mixed solvent, and then acetone 25 to 35 wt%, toluene 15 to 25 wt%, methyl ethyl Ketone (METHYL ETHYL KETONE) is made of 5 to 10 wt% more.

In addition, in order to prevent deterioration of the watertight material, it further comprises 1 to 2 wt% of a stabilizer.

In addition, as the curing agent, amide, melamine, amine, and the like are used, and further comprises 0.2 to 2 wt%.

If the content of the curing accelerator is less than 0.1 parts by weight, there is a problem in adhesion of the watertight material due to insufficient coating film curing, and if it exceeds 2 parts by weight, curing may occur during storage to cause defects.

In addition, toluene and methyl ethyl ketone are mixed by melting polyester resin, fluorine resin, vinyl chloride resin (PVC), epoxy resin, urethane resin and acrylic resin as main components of the surface layer of the PVC-Sol layer, which is a coating layer of steel sheet. The content thereof is preferably 15 to 25 wt% of toluene and 5 to 10 wt% of methyl ethyl ketone. If the sum of the content of the toluene and methyl ethyl ketone is less than 20% by weight, the surface layer of the cured PVC-Sol layer is not melted, and if it is 35% by weight or more, the surface layer of the PVC-Sol layer is excessively melted and the coating of the surface layer of the steel sheet is eroded. There is a problem that durability is lowered.

In addition, the coating layer of the steel sheet is 20 to 75 wt%, solvent 5 to 60 wt%, dispersion of at least one selected from polyester resin, fluorine resin, vinyl chloride resin (PVC), epoxy resin, urethane resin and acrylic resin 3 to 15 wt%, and 2 to 5 wt% of calcium and zinc-based stabilizers.

Looking in detail at the bonding portion coated with a water-tight agent to the bonding portion provided with a PVC-Sol layer which is a coating layer of the inner steel sheet shown in Figure 5, the PVC-Sol layer 20 coated on the steel sheet is the bonding portion 13 It can be seen that the PVC-Sol layer coated as shown in FIG. 30 is melted by the watertight material 50 applied to the glass, and is applied to a large amount of watertight material compared to the outer portion at the center of the joint. As the watertight material needs more time to contact the surface layer of the PVC-Sol layer coated on the steel sheet at the time of curing than the outer portion, the surface layer of the PVC-Sol layer coated on the steel sheet by the solvent contained in the liquid watertight material is The surface layer which is melted and melted by the solvent is melted in a large amount compared to the outer part, and the mixed layer 30 is formed while the molten surface layer (PVC-Sol layer) and the watertight material are mixed, and the mixed layer is the surface layer and the watertight Ash is hardened It can be seen that the rigidly attached.

As such, the mixed layer 30 in which the molten surface layer and the watertight material are mixed is formed, and at the same time, as they are cured and adhered, the adhesive force is improved to prevent the bonding portion coated with the watertight material from being ruptured, cracked, or peeled off.

In order to test the present invention, as shown in Table 1 below, the water-tight material according to the present invention was prepared by blending and uniformly mixing the materials according to the composition and proportion of the water-tight material.

Table 1

For watertightness test of the corrugated steel pipe according to the present invention by using each of the watertight material according to the present invention prepared in the <Examples 1 to 3> in the ratio as shown in Figure 1 above by the inner surface of 500mm Three corrugated steel pipes with a thickness of 0.8 mm were manufactured.

Fill the water inside the corrugated steel pipe while sealing the both ends of the corrugated steel pipe for watertightness test for the three corrugated steel pipes produced above, The results of observing the leakage at 1 hour stationary pressure condition at 2㎏ / ㎠ is shown in Table 2 below. (Watertight characteristic value; No leakage; ◎, Small leakage: ○, Water leakage: indicated with x)

TABLE 2

As shown in Table 2, in the breakdown pressure test of the corrugated steel pipe coated by the watertight material developed on the inner surface of the coated inner smooth double corrugated steel pipe joint of the present invention, no leakage was found. It can be seen that the surface layer of the PVC-Sol layer, which is a coating layer of the steel sheet, is melted and mixed and welded with the watertight material to improve watertightness.

Figure 6 shows the result of the leakage pressure resistance test results of the internal smooth double-corrugated steel pipe according to the prior art, Figure 7 shows the pressure resistance test results of the internal smooth double-corrugated steel pipe coated watertight material according to the present invention, perfectly It can be seen that there is no leakage of the result of improved water tightness.

  As described above, the basic technical idea of the present invention is a repair agent based on an organic compound based on the surface of the corrosion resistant multilayer film coated on corrugated steel pipe, and a repair agent applied to repair damage of the corrosion resistant multilayer film due to excellent adhesion to paint. It can be seen that the present invention provides a corrugated corrugated steel pipe having a film that is easy to repair a damaged coating layer in which peeling is prevented and reliability of the repair operation is increased.

Various modifications are possible by those skilled in the art within the basic technical scope of the present invention, and therefore, the scope of the present invention should be interpreted within the claims written to include various modifications. will be.

10: corrugated steel pipe
11: outer circumferential surface of the double corrugated steel pipe
12: inner circumferential surface of a double corrugated steel pipe
13: joining portion of a double corrugated steel pipe
20: PVC-Sol layer coated on the steel sheet
30: Mixed layer of the surface layer (PVC-Sol layer) melted by the watertight material and the watertight agent
50: pure watertight layer

Claims (4)

The outer circumferential surface is formed into a spiral bent by bending the coated outer steel plate into a wave shape, and the inner circumferential surface is wound into a spiral by winding an inner steel sheet having a coating layer [PVC (Poly Viny Choride) -Sol] into a smooth portion to fold the left and right ends of the laminated side. In the double corrugated steel pipe 10 of the coated steel sheet formed to have a uniform surface therein with a coupling portion for binding and coupling,
Adding a watertight member to the binding portion of the inner steel sheet,
The watertight material is formed as an integral surface by combining with an inner steel surface coating layer [PVC (Poly Viny Choride) -Sol] to be bonded to each other,
The watertight material is
Polyvinyl chloride (POLY VINYL CHLORIDE) A watertightness-coated inner smooth double-corrugated steel pipe comprising 20 to 40 wt% of acetone and toluene. The method of claim 1,
The watertight material is 25 to 35 wt% of acetone, 15 to 25 wt% of toluene, and 5 to 10 wt% of methyl ethyl ketone (METHYL ETHYL KETONE). . The method of claim 2,
The watertight material is a cyclohexanone (cyclohexanone) 5 to 15wt%, characterized in that the water-tightness-improved coated inner smooth double-corrugated steel pipe, characterized in that made.
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