KR20010048311A - double PE sheet corrugated steel pipe, apparatus and method thereof - Google Patents

Abstract

PURPOSE: A double PE(polyethylene) sheets corrugated steel pipe, and an apparatus and a method for molding the corrugated steel pipe are provided to reinforce the strength, the anti-corrosiveness, the anti-oxidative of the pipe, to increase the life of use, and to prevent the friction coefficient of the inner peripheral of the pipe. CONSTITUTION: A double coating layer(20) consists of a first coating layer(16) formed by providing polarity to high density polyethylene, and a second coating layer(17) of glossy high density polyethylene bonded to the outer surface of the first coating layer. A shot blast machine bends a galvanized steel pipe(2) and removes the foreign substance on the surface of the galvanized steel pipe for increasing the adhesive force of the double coating layer transferred from an uncoiler. The bent galvanized steel pipe is heated to a desired temperature by a high frequency induction heater. A coating molding machine coats the double coating layer on the inner surface and the outer surface of the galvanized steel pipe by using a fusion rolling method. A cooling device cool the galvanized steel pipe coated by the double coating layer to mold it as a double PE layer coated spiral corrugated steel pipe.

Description

Double coated sheet coated corrugated steel pipe, apparatus for forming the same and method thereof {double PE sheet corrugated steel pipe, apparatus and method

The present invention relates to a double PE sheet-coated corrugated steel pipe, a device for forming the same, and a method thereof, and more particularly, a spiral that is widely used for wastewater pipes, road drainage, etc., due to its excellent external pressure strength, durability, and workability. The high density poly ethylene is coated on the inner and outer sides of the galvanized steel sheet formed by corrugated steel pipe to form a corrugated steel pipe having strong strength, corrosion resistance, and oxidation resistance.

In general, the fume pipe of the concrete material used in roads, harbors, sewage treatment plants, etc. is inconvenient to transport and handle due to its weight and volume increase. In addition, heavy equipment input is required during construction, and workability due to the installation and dismantling of the formwork is remarkably difficult to meet the construction period, and construction is limited in winter due to freezing of foundation cement and joints. The longer the period has a problem that the overall construction cost increases.

In addition, while the fume pipe of the concrete material is excellent in strength, there is a problem that is easily cracked or destroyed by the impact applied from the outside during transportation and construction.

Therefore, as shown in Figure 1, excellent external pressure strength, durability, workability, etc. is a corrugated steel pipe with a spiral bent portion formed on the surface using a galvanized steel plate as a general drain pipe, a highly polluted living sewer pipe, factory drain pipe, etc. Is being used.

However, when the corrugated steel pipe of the above galvanized steel sheet is used as a wastewater, wastewater pipe, domestic sewage pipe, etc., the corrugated steel pipe is corroded and oxidized due to the toxicity of sewage, wastewater, and living sewage. As a result, the service life is greatly shortened.

In view of the above problems, by coating a predetermined powder on the surface of the corrugated steel pipe to be spiral formed by heat fusion, the corrugated steel pipe has corrosion resistance and oxidation resistance.

However, in the coating method using powder, the thickness of the coating layer laminated on the corrugated steel pipe and the acid is different, so the reliability of the product is lowered and the cost of the powder is increased when the thickness of the coating layer is increased. You have a problem.

Accordingly, an object of the present invention is to form a corrugated steel pipe after double-coating high density polyethylene on the inner and outer surfaces of a galvanized steel sheet formed of a spiral corrugated steel pipe used for wastewater, wastewater pipes, and the like. The present invention provides a double PE sheet-coated corrugated steel pipe, an apparatus for forming the same, and a method thereof, by which oxidation resistance is enhanced so that a service life of a corrugated steel pipe can be significantly extended.

Another object of the present invention is to eliminate the resistance factor of the fluid by minimizing the friction coefficient of the inner circumference of the corrugated steel pipe to prevent the degradation of the hydraulic properties compared to the PE pipe double PE sheet coated corrugated steel pipe The present invention provides an apparatus and a method for molding the same.

1 is a schematic diagram of a corrugated steel pipe formed of a galvanized steel sheet according to the prior art,

2 is a schematic internal cross-sectional view of a double PE sheet-coated corrugated steel pipe formed by the present invention;

3 is a schematic view of an apparatus for forming a double PE sheet-coated corrugated steel pipe according to the present invention;

4 is a flow chart showing the operation procedure of a method for forming a double PE sheet-coated corrugated steel pipe according to the present invention;

5 is a cross-sectional view of another embodiment of a double PE sheet-coated corrugated steel pipe formed by the present invention;

6 is a cross-sectional view of another embodiment of a double PE sheet-coated corrugated steel tube formed according to the present invention.

* Explanation of symbols used in the main part of the drawing

One; Rotater

2; galvanized steel

3; Uncoiler

4; Shot blast M / C

5,6,7,8,10,11; roller

9; High frequency induction heater

12,13; Film uncoiler

14; Cover Molding Machine

15; Chiller

The object of the present invention described above is that zinc is formed by forming a spiral corrugated steel pipe having a double covering sheet layer composed of a first coating layer imparting a polar group to the high density polyethylene and a second coating layer of polished high density polyethylene bonded to the outside of the first coating layer. It is achieved by providing a double PE sheet-coated corrugated steel pipe, characterized by coating on the inner and outer sides of the plated steel sheet by fusion.

The object of the present invention described above is to increase the adhesiveness of the uncoiler, which is galvanized steel sheet is retractably wound during its rotation, and the coated sheet material coated on the inner and outer sides of the galvanized steel sheet conveyed from the uncoiler. A short blast for bending the galvanized steel sheet and removing impurities on the surface of the galvanized steel sheet, a high frequency induction heating apparatus for heating the galvanized steel sheet passing through the short blasting group to a predetermined temperature, and the high frequency induction heating apparatus. A coating for coating the inner and outer sides of the galvanized steel sheet by fusion by fusion on the inner and outer sides of the galvanized steel sheet, the double-compressed coated sheet material of high density polyethylene conveyed from the film uncoiler formed on the upper and lower sides of the galvanized steel sheet heated to a predetermined temperature passing therethrough. The inner and outer surfaces passing through the molding machine and the coating molding machine are covered by the coating sheet material. Is achieved by providing a forming device for a dual PE sheet, characterized by configured by comprising a cooling device for cooling the dual coating process of the galvanized steel sheet in the conveyance to a subsequent process for forming a corrugated steel pipe coated corrugated steel pipe.

The object of the present invention described above is to short the zinc plated steel sheet to remove the impurities on the surface of the galvanized steel sheet to increase the adhesion of the coated sheet material coated on the inner and outer sides of the galvanized steel sheet conveyed from the uncoiler. A first step of processing, a second step of heating the galvanized steel sheet which is short-processed and transported to a predetermined temperature by a high frequency induction heating apparatus, and film uncoated on inner and outer sides of the galvanized steel sheet which is heated and conveyed to a predetermined temperature. A third step of coating the double-compressed coated sheet material of high-density polyethylene conveyed from the air by fusion by rolling; and cooling the galvanized steel sheet having double coated inner and outer surfaces by the coated sheet material. A double PE sheet comprising a fourth step of transferring the steel pipe to a subsequent process of forming the steel pipe A manufacturing method of the double corrugated steel pipe is achieved by providing.

According to a preferred embodiment, the thickness of the first coating layer is in the range of 0.1 mm to 0.4 mm, and the thickness of the second coating layer is in the range of 0.1 mm to 0.6 mm.

According to a preferred embodiment, the temperature for heating the galvanized steel sheet by the high frequency induction heating apparatus is about 120 ℃ to 150 ℃ range.

According to a preferred embodiment, the double coated sheet layer is coated by fusion welding on the inner surface of the galvanized steel sheet formed into a spiral corrugated steel pipe.

According to a preferred embodiment, the double coated sheet layer is coated by fusion welding on the outer surface of the galvanized steel sheet formed into a spiral corrugated steel pipe.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings, which are intended to be described in detail to be easily carried out by those skilled in the art in order to facilitate understanding of the present disclosure. This does not mean that the technical scope herein is limited.

As shown in Figs. 2 to 4, an uncoiler 3 (uncoiler) in which the galvanized steel sheet 2 is retractably wound upon rotation of its rotator 1, and a pair of rollers 5 6) galvanized steel sheet to increase the adhesiveness of the double-compressed coated sheet material 20 of the high-density polyethylene material coated on the inner and outer sides of the galvanized steel sheet 2 transferred from the uncoiler 3 by driving. (2) a fine blasting process (4) (shot blast M / C) for removing impurities such as sludge and scale deposited on the surface of the galvanized steel sheet (2); High frequency induction heating device 9 (high frequency induction heating) for heating the galvanized steel sheet 2 passing through the shot blasting machine 4 by a pair of rollers 7 and 8 within a range of about 120 ° C to 150 ° C. system).

A pair of film uncoilers 12 and 13 rotatably mounted on their upper and lower sides of the galvanized steel sheet 2 which is heated to a predetermined temperature and passes through the above-described high frequency induction heating apparatus 9 (film uncoiler). A coating molding machine 14 and a coating molding machine 14 for coating the cover sheet material 20 drawn from the cover sheet 20 with the fusion by pressurization of several rollers 10 and 11 on the inner and outer surfaces of the galvanized steel sheet 2. It is provided with a cooling device 15 (coolant tank) for cooling the galvanized steel sheet (2), the inner and outer sides of the coating sheet material 20 is double coated by passing through to pass through to the subsequent process of forming the spiral corrugated steel pipe do.

At this time, the coating sheet material 20 coated on the inner and outer sides of the above-described galvanized steel sheet 2, the first coating layer 16 (modified HDPE; high density poly ethylene) and the first to impart a polar group to the high density polyethylene It consists of a second coating layer 17 (general HDPE) of gloss (UV) treated high density polyethylene bonded to the outside of the coating layer 16.

Further, preferably, the thickness of the first coating layer 16 described above is in the range of 0.1 mm to 0.4 mm, more preferably in the range of 0.1 mm to 0.2 mm.

Preferably, the thickness of the above-described second coating layer 17 is in the range of 0.1 mm to 0.6 mm, more preferably in the range of 0.1 mm to 0.4 mm.

Reference numeral 18 denotes zinc by successive driving of several rolling rollers 19 installed coaxially during the transfer of the galvanized steel sheet 2 having the double coated sheet material 20 coated on the inner and outer sides thereof. Corrugated molded part for forming by increasing the number of corrugation step by step on the plated steel sheet (2).

Hereinafter, a method for manufacturing a double PE sheet-coated corrugated steel pipe according to the present invention will be described in detail with reference to the accompanying drawings.

As shown in FIGS. 3 and 4, the galvanized steel sheet 2 wound on the aforementioned uncoiler 3 is released due to rotation of the rotator 1 and is shorted by driving a pair of rollers 5 and 6. It is conveyed to the blast machine 4.

In the above-described shot blasting machine 4, the galvanized steel sheet 2 is driven by a roller not shown so as to increase the adhesiveness of the coated sheet material 20 coated on the inner and outer surfaces of the galvanized steel sheet 2 described above. ) Is finely bent to form an uneven portion, and the impurities such as sludge, scale, etc. deposited on the surface of the galvanized steel sheet 2 are removed by washing (see S10).

The galvanized steel sheet 2 passing through the above-described shot blasting machine 4 by driving a pair of rollers 7 and 8 by a high frequency induction heating apparatus 9 for a predetermined time in the range of about 120 to 150 ° C. It is heated and preheated (refer to S20).

In the above-mentioned coating molding machine 14, the coating sheet material 20 of high density polyethylene is double coated on the inner and outer sides of the galvanized steel sheet 2 which is heated after being heated to a predetermined temperature.

That is, to the first coating layer 16 and the second coating layer 17 to be released from the film uncoiler (12, 13) rotatably installed on its upper and lower sides of the galvanized steel sheet (2) transported in the horizontal direction Due to the pressure of the rollers 10 and 11 installed to coaxially compress the bonded double coated sheet material 20, the inner and outer surfaces of the galvanized steel sheet 2 can be fused to be coated with a predetermined thickness (see S30). ).

In this case, preferably, the thickness of the first coating layer 16 is in the range of 0.1 mm to 0.2 mm, and the thickness of the second coating layer 17 is in the range of 0.1 mm to 0.4 mm.

In the above-mentioned cooling apparatus 15, the galvanized steel sheet 2 coated with the high-density polyethylene coated sheet material 20 on the inner and outer sides is cooled while passing through the cooling water (see S40).

Therefore, the galvanized steel sheet 2 passing through the above-mentioned cooling device 15 passes through several rolling rollers 19 installed to coaxially drive and forms a corrugation portion in the longitudinal direction on the galvanized steel sheet 2. This is then transferred to the subsequent process of forming the final spiral corrugated steel pipe.

On the other hand, although not shown in the drawings, the coating sheet material 20 to be coated on the inside and outside of the above-described galvanized steel sheet 2 is bonded to the triple, quadruple or more to coat the coating of the present invention in the field of the present invention. Of course, it can be determined that the technical idea is modified.

As described above, according to a preferred embodiment, after forming the corrugated steel pipe by coating the high-density polyethylene on the inner and outer sides of the galvanized steel sheet formed of spiral corrugated steel pipe used as wastewater pipes, etc., the strength, Corrosion resistance and oxidation resistance are strengthened, which can greatly extend the service life of corrugated steel pipe.

On the other hand, by minimizing the friction coefficient of the inner circumference of the corrugated steel pipe by removing the resistance factor of the fluid to prevent the deterioration of the hydraulic properties compared to the P.E pipe, thereby having the advantage of making the product competitive.

Claims (5)

A double covering sheet layer composed of a first covering layer imparting a polar group to the high density polyethylene and a second covering layer of polished high density polyethylene bonded to the outside of the first covering layer is welded to the inner and outer surfaces of the galvanized steel sheet formed of spiral corrugated steel pipe. Double PE sheet-coated corrugated steel pipe, characterized in that the coating. An uncoiler, the galvanized steel sheet being retractably wound during its rotation; A shot blasting machine which bends the galvanized steel sheet and removes impurities on the surface of the galvanized steel sheet to increase adhesion of the coated sheet material coated on the inner and outer sides of the galvanized steel sheet conveyed from the uncoiler; A high frequency induction heating apparatus for heating the galvanized steel sheet passing through the shot blasting machine to a predetermined temperature; Rolling the double-compression coated sheet material of high-density polyethylene conveyed from the film uncoiler formed on the upper and lower sides of the galvanized steel sheet heated to a predetermined temperature passing through the high frequency induction heating apparatus to the inner and outer sides of the galvanized steel sheet. A coating molding machine coated with fusion by welding; And The double PE sheet, characterized in that the inner and outer sides passing through the coating molding machine is provided with a cooling device for cooling the galvanized steel sheet double coated by the coating sheet material to transfer to the subsequent step of forming a corrugated steel pipe. Apparatus for forming coated corrugated steel pipe. A first step of bending the galvanized steel sheet to improve adhesion of the coated sheet material coated on the inner and outer sides of the galvanized steel sheet conveyed from an uncoiler, and shorting to remove impurities on the surface of the galvanized steel sheet; A second step of heating the galvanized steel sheet which is short-processed and transferred to a predetermined temperature by a high frequency induction heating apparatus; A third step of coating the double-compressed coated sheet material of high-density polyethylene conveyed from the film uncoiler by fusion by rolling on the inner and outer sides of the galvanized steel sheet which is heated and conveyed to a predetermined temperature; And And a fourth step of cooling the galvanized steel sheet whose inner and outer sides are double-coated by the coated sheet material to be transferred to a subsequent process of forming a corrugated steel pipe. . The double PE sheet-coated corrugated steel pipe according to claim 1, wherein the thickness of the first covering layer is in the range of 0.1 mm to 0.4 mm, and the thickness of the second covering layer is in the range of 0.1 mm to 0.6 mm. The double PE sheet-coated corrugated steel pipe according to claim 1, wherein the double coated sheet layer is coated on one of the inner and outer surfaces of the galvanized steel sheet formed by the spiral corrugated steel pipe by fusion welding.