KR102286128B1 - Corrugated steel pipe with polyethylene sheet layer - Google Patents

Abstract

The present invention relates to a corrugated steel pipe having a PE sheet layer, for this purpose, a steel pipe body having a cross section in which corrugations made of mountains and valleys are repeated; and a PE sheet layer attached to the inner and outer surfaces of the steel pipe body; and an inner profile attached to the inside of the steel pipe body to increase the smoothness and improve the roughness coefficient. This is further applied, and the PE sheet layer is made by impregnating PE resin with a mesh network as a core material, and the inner profile is attached to the inner mountain of the steel pipe body and the smooth band crossing between the mountains, and the inner mountain of the steel pipe body. It is characterized in that it consists of a curved curved portion, and an adhesive portion extending up and down at both ends of the smooth table and bonded to the inner bone of the steel pipe body.

Description

Corrugated steel pipe with PE sheet layer {CORRUGATED STEEL PIPE WITH POLYETHYLENE SHEET LAYER}

The present invention relates to a corrugated steel pipe having a PE sheet layer that has the advantages of chemical resistance of PE pipe and the strength of steel pipe, and more particularly, PE made of a mesh net on the inner and outer surfaces of the steel pipe body. It relates to a corrugated steel pipe having a PE sheet layer that can extend life by improving durability, abrasion resistance and chemical resistance as well as rigidity by integrating the sheet layer.

In general, corrugated steel pipes are widely used for drainage of sewage/wastewater, domestic water or industrial water supply in the civil engineering field.

It is widely adopted and used as a hollow formwork or a building suit in the construction field.

In addition, these corrugated steel pipes are a replacement material for the existing concrete drainage pipes due to the increased awareness of the manpower shortage, cost, and environmental problems during the construction of drainage pipes. And it is evaluated as an excellent drainage structure that provides workability.

Therefore, in the case of civil engineering, these corrugated steel pipes are suitable for drainage of domestic sewage, factory wastewater, or farm wastewater, large-scale public facilities (especially airports), swamps, golf courses, large-scale sports facilities, complex leisure towns, or roads (highways, local roads). Or subway or high-speed train, etc.) drainage, agricultural or industrial water supply, etc. In the case of construction, it is also used as a hollow formwork or construction suit for the construction of buildings or bridges.

On the other hand, such corrugated steel pipe is usually manufactured through a process of forming a corrugation by forming a hot-dip galvanized or chrome-plated steel sheet, cutting the corrugated steel sheet to an appropriate length, and re-bending both ends.

However, the corrugated steel pipe has a weak strength, so there is a risk that the shape may be deformed by an external force, and there is a problem in that the chemical resistance is weak.

Therefore, a PE pipe having excellent chemical resistance is sometimes used, but the PE pipe has a problem in that it may be damaged locally due to abrasion resistance and brittleness.

As a patent in consideration of this problem, there is "Watertight PE double-coated corrugated steel pipe and its manufacturing method (Korean Patent No. 1476132)".

However, in this prior art, a simple corrugated steel pipe is coated with PE resin, and rigidity and durability can be increased in a small-sized corrugated steel pipe, but there is a problem in that rigidity and durability are weak in a medium-large corrugated steel pipe.

For this reason, there is a need for a corrugated steel pipe capable of securing the problems of medium and large-sized corrugated steel pipes and PE pipes.

Republic of Korea Patent No. 1476132

The present invention has been devised in view of the above problems, and the first object of the present invention is to integrate a PE sheet layer made of a mesh net on the inner and outer surfaces of a steel pipe body to provide rigidity, durability, abrasion resistance and chemical resistance. To provide a corrugated steel pipe having a PE sheet layer that can improve the lifespan.

A second object of the present invention is to provide a corrugated steel pipe having a PE sheet layer having a structure that can improve the roughness coefficient by preventing the fluid flowing inside through the inner profile from interfering, and also reinforce the rigidity due to external force. .

According to the features for achieving the above object, the first invention relates to a corrugated steel pipe having a PE sheet layer, for this purpose, a steel pipe body having a cross-section in which corrugations made of mountains and valleys are repeated; And, the inside of the steel pipe body PE sheet layer attached to the surface and the outer surface; and an inner profile attached to the inside of the steel pipe body to increase the smoothness and improve the roughness coefficient. This is further applied, and the PE sheet layer is made by impregnating a PE resin with a mesh network as a core material, and the inner profile is attached to the inner mountain of the steel pipe body and the smooth band crossing between the mountains, and the inner mountain of the steel pipe body. It is characterized in that it consists of a curved curved portion, and an adhesive portion extending up and down at both ends of the smooth table and bonded to the inner bone of the steel pipe body.

In the second invention, in the first invention, the mesh network of the PE sheet layer is composed of a PE mono thread so as to be easily impregnated with a PE resin having excellent tensile strength, and the PE mono thread is between weft and warp so that abrasion resistance and chemical resistance are increased. It is characterized in that it is composed of nylon yarn woven at regular intervals.

In the third invention, in the second invention, the PE monofilament crosslinks intermolecularly by irradiating radiation to improve it into a reticulated macromolecule to increase mechanical properties, heat resistance, and tensile strength without dimensional change. do.

The fourth invention, in the first invention, the inner profile is characterized in that the PE sheet layer is further coupled to the inner surface of the steel pipe body.

In a fifth invention, in the first invention, the inner profile is integrally connected with a first support extending upward from two places of the smooth band and entering the inner valley of the steel pipe body, and an end of each of the first supports, It is characterized in that it is composed of a load distribution band in the form of concentric circles for distributing the transmitted load, and a second support member branching from the load distribution band and contacting the inner bone of the steel pipe body.

According to the corrugated steel pipe having a PE sheet layer of the present invention, a PE sheet layer made of a mesh net is integrated on the inner and outer surfaces of the steel pipe body to improve rigidity, durability, abrasion resistance and chemical resistance, thereby increasing the lifespan. there is.

In addition, the roughness coefficient is improved by preventing the fluid flowing inside through the inner profile from being interfered with, and there is an effect of reinforcing the rigidity due to an external force.

1 is a cross-sectional view of a corrugated steel pipe having a PE sheet layer according to a first embodiment of the present invention;
A photograph of the PE sheet layer extracted from FIG. 2,
Figure 3 is a photograph showing the PE mono yarn extracted from Figure 2,
4 is a cross-sectional view of a corrugated steel pipe having a PE sheet layer according to a second embodiment of the present invention.

The following objects, other objects, features and advantages of the present invention will be readily understood through the following preferred embodiments in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments described herein and may be embodied in other forms.

Rather, the embodiments introduced herein are provided so that the disclosed subject matter may be thorough and complete, and that the spirit of the present invention may be sufficiently conveyed to those skilled in the art.

The embodiments described and illustrated herein also include complementary embodiments thereof.

As used herein, the singular also includes the plural unless specifically stated otherwise in the phrase. As used herein, the terms 'comprise' and/or 'comprising' do not exclude the presence or addition of one or more other components.

Hereinafter, the present invention will be described in detail with reference to the drawings. In describing the specific embodiments below, various specific contents have been prepared to more specifically explain and help the understanding of the invention. However, a reader having enough knowledge in this field to understand the present invention can recognize that it can be used without these various specific details. In some cases, it is mentioned in advance that parts that are commonly known and not largely related to the invention in describing the invention are not described in order to avoid confusion in describing the invention.

Hereinafter, a corrugated steel pipe having a PE sheet layer according to the present invention will be described in detail together with the accompanying drawings.

1 is a cross-sectional configuration diagram of a corrugated steel pipe having a PE sheet layer according to a first embodiment of the present invention, a photograph of the PE sheet layer extracted from FIG. 2, and FIG. 3 is a PE mono yarn extracted from FIG. It's a photo.

1 to 3, the present invention is to have the advantages of the PE pipe and the advantages of the steel pipe, and the PE sheet layer 20 made of a mesh network as the core material is integrated on the inner and outer surfaces of the steel pipe body. It relates to a corrugated steel pipe 100 having a PE sheet layer capable of increasing durability, abrasion resistance, and chemical resistance by improving rigidity and chemical resistance.

The corrugated steel pipe 100 having the PE sheet layer is largely composed of three parts, which is composed of a steel pipe body 10 , a PE sheet layer 20 , and an inner profile 30 .

The steel pipe body 10 has a structure having a cross-section in which waves formed of mountains and valleys are repeated by forming a metal steel plate.

The steel pipe body 10 is configured by bonding a PE sheet layer 20 to improve corrosion prevention and chemical resistance as well as rigidity, and to increase durability and abrasion resistance.

The main purpose of the PE sheet layer 20 is to increase the lifespan of the corrugated steel pipe, and it is integrated into the inner and outer surfaces of the steel pipe body 10, which are formed on the inner and outer surfaces of the steel pipe body 10. It is possible by attachment by the applied adhesive resin layer 40 .

Here, the PE sheet layer 20 is made of a mesh network as a core material and is impregnated with PE resin.

At this time, the mesh network is made of the same material as the PE resin, and is made of PE mono yarn 21 which is easy to impregnate and has excellent tensile strength.

The PE monofilament 21 is irradiated with radiation such as high energy such as electron beam, β-ray, and r-ray to cross-link intermolecularly and improve it into a reticulated macromolecule, thereby increasing mechanical properties, heat resistance and tensile strength without dimensional change. can do it

The method of irradiating the radiation is a method of crosslinking the PE monofilament 21, and the properties of PE are significantly changed by this treatment. For example, the tensile strength is greatly increased, so that the worry of stress-cracking is virtually eliminated, the weather resistance is remarkably improved, and heat resistance that does not soften even at 250°C can be secured.

In addition, as shown in FIG. 2 , the PE monoyarn 21 is configured by woven nylon yarns 211 with a predetermined interval between the weft yarns and the weft yarns to increase abrasion resistance and fire resistance. At this time, of course, it is possible to improve the reticular macromolecules by irradiating PE mono yarns containing nylon yarns with radiation.

And the PE monoyarn 21 is configured to increase the tensile force by densely arranged spacing between the weft yarn and the warp yarn at intervals of 1 mm to 1.5 mm, and also to increase the pressure rigidity to 200 to 220 denier of one strand thickness. .

On the other hand, the steel pipe body 10 may form scratch grooves 13 on the inner and outer surfaces of the steel pipe body 10 to prevent peeling of the PE sheet layer 20 and facilitate adhesion, and also the PE sheet The layer 20 is not a smooth surface as shown in FIG. 2 (b), but a surface with increased surface roughness by protruding the shape of the PE mono yarn 21 by the impregnation of PE resin as shown in FIG. 2 (a). It should be preceded to be attached to one surface of the steel pipe body (10).

After the above-mentioned steel pipe body 10 is heat-treated on the surface, the adhesive resin layer 40 is applied to the inner and outer surfaces, and then the PE sheet layer 20 is adhered to the PE sheet layer 20 by pressing with a pressure roller. can be attached.

In addition, the inner profile 30 is attached to the inside of the steel pipe body 10 to reinforce the inside of the steel pipe body 10, while improving the internal roughness coefficient.

The inner profile 30 includes a smooth band 31 crossing between the inner mountain and the mountain of the steel pipe body 10, a curved curvature part 311 attached to the inner mountain of the steel pipe body 10, and a smooth It consists of adhesive parts 312 extending vertically at both ends of the base 31 .

At this time, it is preferable that the bonding part 312 has a curved shape corresponding to the radius of curvature of the inner valley 12 of the steel pipe body 10 .

In addition, the smooth table 31 functions to improve the roughness coefficient by preventing the fluid flowing into the steel pipe body 10 from being interfered with, and the bonding part 312 increases the bonding area and is applied through the adhesive material. It functions to smoothly adhere to the curved surface of (12).

On the other hand, the inner profile 30 is a PE sheet layer 20 is further coupled to the inner surface of the steel pipe body 10 can improve rigidity and wear resistance.

4 is a cross-sectional view of a corrugated steel pipe having a PE sheet layer according to a second embodiment of the present invention.

As shown in FIG. 4 , the second embodiment includes the first embodiment, except that the inner profile 30 includes a first support 32 , a second support 34 and a load distribution board 33 . It is a configuration that further includes.

The first support 32 extends upward from two places of the smooth bar 31, and the upper part of the steel pipe body 10 is collected in a form to stably support and receive a load or an external shock. (12) is the structure to enter.

The load distribution band 33 is integrally connected to the end of each of the first supports 32 and is formed in a concentric circle shape so that the transmitted load can be distributed.

And the second support 34 is branched from the load distribution zone 33 and is in contact with both sides of the inner trough 12 of the steel pipe body 10 to reinforce the steel pipe body 10, and external It is made in an oval shape that can be stretched and contracted so that it can absorb external shocks or loads transmitted from it.

In this inner profile 30, the second support 34 of the oval shape absorbs the external shock by itself, and the impact transmitted through each second support 34 is applied to the concentric circle-shaped load distribution bar 33. It can be effectively dispersed through

The embodiments described in this specification and the configurations shown in the drawings are only the most preferred embodiment of the present invention and do not represent all the technical spirit of the present invention, so various equivalents that can be substituted for them at the time of the present application It should be understood that there may be variations and examples.

10: steel pipe body 11: mountain 12: rib
12: scratch groove
20: PE sheet layer 21: PE mono yarn 211: nylon yarn
30: inner profile 31: smooth band 311: curved part
312: adhesive part 32: first support
33: load distribution zone 34: second support
40: adhesive resin layer
100: corrugated steel pipe having a PE sheet layer

Claims (5)

a steel pipe body 10 having a cross section in which waveforms composed of mountains 11 and valleys 12 are repeated;
a PE sheet layer 20 attached to the inner and outer surfaces of the steel pipe body 10;
Provided with an inner profile 30 attached to the inside of the steel pipe body 10 to increase the smoothness to improve the roughness coefficient,
An adhesive resin layer 40 is further applied to the inner and outer surfaces of the steel pipe body 10 to be integrated by attaching the PE sheet layer 20,
The PE sheet layer 20 is made by impregnating a PE resin with a mesh network as a core material,
The inner profile 30 has a smooth band 31 that crosses between the inner mountain 11 and the mountain 11 of the steel pipe body 10 and is curved attached to the inner mountain 11 of the steel pipe body 10 . a curved portion 311 and an adhesive portion 312 that extends vertically at both ends of the smooth table 31 and adheres to the inner valley 12 of the steel pipe body 10,
The mesh network of the PE sheet layer 20 is composed of PE mono yarn 21 so as to be easily impregnated with PE resin having excellent tensile strength,
The PE mono yarn 21 is composed of nylon yarn 211 woven at a predetermined interval between the weft yarn and the warp yarn so as to increase abrasion resistance and chemical resistance,
The PE monofilament 21 is made to improve mechanical properties, heat resistance and tensile strength without dimensional change by crosslinking intermolecularly by irradiating radiation to improve it into a reticulated macromolecule,
The inner profile 30 is a first support 32 that extends upward from two places of the smooth bar 31 and enters the inner valley of the steel pipe body 10, and each of the first supports 32 A second load distribution band 33 in the form of a concentric circle that is integrally connected with the end and distributes the transmitted load, and is branched from the load distribution band 33 and is in contact with the inner trough 12 of the steel pipe body 10 . Corrugated steel pipe having a PE sheet layer, characterized in that it is composed of a support (34).



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