KR102712103B1 - manufacturing and installation method of dual heat shrink casing with reinforced connection of dual thermal pipes - Google Patents

Abstract

The present invention relates to a 'method for manufacturing and installing a dual heat-shrinkable casing with a reinforced connection portion of a double insulation pipe';
A dual heat shrinkable casing having a double structure according to the manufacturing and installation method of the present invention is installed on the outside of the connection part of a plurality of double insulation pipes, thereby strengthening the load-bearing capacity of the double insulation pipe connection part due to soil load;
The double insulation pipe, including the heat shrink casing, has improved leak prevention, heat retention, durability, and bonding strength, and can be recycled as it is made from 100% recycled raw materials;
When repairs to the double insulation pipe are required, the repair surface can be repaired quickly and easily, improving workability and reducing repair costs;
The present invention relates to a 'dual heat shrinkable casing with reinforced joints of double insulation pipes', which is easy to manufacture and install and has a more convenient configuration for use.

Description

Manufacturing and installation method of dual heat shrink casing with reinforced connection of dual thermal pipes

The present invention relates to a 'method for manufacturing and installing a dual heat-shrinkable casing with reinforced joints of a double-insulated pipe', which is installed outside the joints of a double-insulated pipe to supply heat generated in a combined heat and power plant or a waste incinerator, etc., to a large area including an apartment complex or a commercial building through a district heating system, or to supply hot water for tap water or industrial hot water;

More specifically, a dual heat-shrinkable casing having a double structure according to the manufacturing and installation method of the present invention is installed outside the connecting portion of a plurality of double insulation pipes, thereby strengthening the load-bearing capacity of the double insulation pipe connecting portion due to soil load;

The double insulation pipe, including the heat shrink casing, has improved leak prevention, heat retention, durability, and bonding strength, and can be recycled as it is made from 100% recycled raw materials;

When repairs to the double insulation pipe are required, the repair surface can be repaired quickly and easily, improving workability and reducing repair costs;

The present invention relates to a 'dual heat shrinkable casing with reinforced joints of double insulation pipes', which is easy to manufacture and install and has a more convenient configuration for use.

In general, heat generated from combined heat and power plants, waste incinerators, etc. is supplied to large areas including apartment complexes and commercial buildings through district heating systems, and double-insulated pipes are used as heat transport pipes to supply hot water for tap water and industrial use.

A double-insulated pipe is composed of an inner pipe made of a steel pipe through which hot water (heat) flows, an outer pipe made of synthetic resin material including high-density polyethylene (HDPE) that wraps the outer surface of the inner pipe, and an insulating layer made of insulating material that is filled between the inner pipe and the outer pipe.

Polyurethane is mainly used as insulation material, and the pipe lines that make up the district heating system are made by connecting multiple double-insulated pipes. Meanwhile, the exterior and insulation layer are also called double-insulated pipes.

Figures 1a and 1b are cross-sectional views showing a state in which a casing is installed outside a conventional double-insulated pipe. In addition, Figure 1c is a cross-sectional view showing a state in which the inner tube ends of two double-insulated pipes are connected to each other. In addition, Figure 1d is a cross-sectional view showing a state in which the casing is moved to the connecting portion of two double-insulated pipes to apply heat.

As shown, the connection of the double insulation tube (10) of the prior art includes a cylindrical casing (5) that surrounds the outer surface (3) of two double insulation tubes (10), and an insulating material such as urethane foam (4) that is filled inside the heat-shrinkable casing (5) to insulate the inner tube (1).

The process for connecting two double insulation tubes is as follows.

First, a cylindrical casing (5) is inserted into one of the two double insulating tubes (10) whose ends of the inner tubes (1) are exposed to the outside, and the two inner tubes (1) of the two double insulating tubes (10) are connected to each other by welding while the end surfaces of the inner tubes (1) of the two double insulating tubes (10) are in contact with each other. Then, a double-sided heat-sealing tape is attached in a circular band shape to the ends of the outer tubes (3) of each of the two double insulating tubes (10), and then the portion of the inner tube (1) exposed to the outside is covered with the casing (5).

The two ends of the casing (5) are each heated by a heating means such as a torch lamp, thereby shrinking the two ends of the heat-shrinkable casing (5) and sealing it against the outer shell (3). At this time, the double-sided heat-sealing tape located between the casing (5) and the outer shell (3) melts, thereby sealing the space between the casing (5) and the outer shell (3).

Korean Patent Registration No. 10-0839205 (hereinafter referred to as “prior art 1”) discloses a technology for connecting double insulation pipes. Prior art 1 discloses a technology for wrapping the ends of two adjacent double insulation pipes with a heat shrinkable sheet (heat shrinkable plate), forming inclined surfaces on each end of the heat shrinkable sheet, attaching the inclined surfaces to each other to create a casing, and wrapping the casing with a heat-resistant band.

However, prior art 1 is complicated to manufacture because it requires forming inclined surfaces at both ends of the heat shrinkable sheet, and because the heat-resistant band is wrapped around the casing, the configuration is complicated and a lot of materials are required, and when insulation is filled inside the casing, the airtightness is reduced, causing a problem of insulation leakage.

In addition, Korean Patent Registration No. 10-0625893 (hereinafter referred to as “prior art 2”) discloses a technology for wrapping two adjacent double insulation pipes multiple times with a heat shrink sheet and heat-fusing the multiple-wound heat shrink sheet.

Prior art 2 has a problem in that since the heat shrinkage sheet is wound multiple times, if the layers are not tightly sealed, a space (gap) is created inside, which reduces the sealing force, and it is not easy to heat-fuse the heat shrinkage sheet that has been wound multiple times.

In addition, the double insulation pipe and casing disclosed in the prior art and the prior art documents below;

As shown in Figures 1c to 1e,

In a double insulation pipe (10) composed of an inner pipe (1) which is a steel pipe through which hot water (heat) flows, an outer pipe (3) made of synthetic resin material including high-density polyethylene (HDPE) that wraps the outer surface of the inner pipe, and an insulation layer composed of urethane foam (4) which is an insulating material that is filled between the inner pipe (1) and the outer pipe (3),

When the heat shrinkable sheet or the casing (5) formed by the heat shrinkable sheet in a cylindrical shape is heat-joined in a horizontal plane in a straight line on both sides of the polyethylene pipe as the outer tube (3) forming the double insulation tube (10), the space provided between the heat shrinkable sheet or the casing (5) formed by the heat shrinkable sheet in a cylindrical shape and the steel pipe as the inner tube (1) is filled with urethane foam (4) as an insulating material, by the connection structure of the double insulation tube (10);

In particular, since a space is created between the inner tube (1) and the heat shrinkable sheet or casing (5) where the urethane foam (4) as insulation is filled, it is impossible to directly heat or join the heat shrinkable sheet or casing (5) to the outside of the inner tube (1) as the steel pipe:

In addition, since the heat shrinkage sheet or casing (5) is heat-bonded only on both sides of the polyethylene pipe (3), the bonding strength is significantly reduced, and the heat shrinkage sheet or casing (5) comes off to the outside of the polyethylene pipe (3), which is the outer shell, causing a problem that makes use difficult;

To improve this, the heat shrinkage sheet or casing (5) is heat-bonded to a longer length on both sides of the polyethylene pipe (3), which is the outer shell, so that the time required for heat bonding is long, and the corresponding part of the casing (5) laminated on top of the urethane foam (4), which is the insulation, is separated, making it difficult to use;

In order to fill the space under the casing (5) with urethane foam (4), which is an insulating material, the problem is that the heat shrinkable sheet laminated on the upper part of the inner and outer parts (1,3) or the outer part of the casing (5) must be manufactured larger;

In order to manufacture the casing (5), it is difficult to heat and fuse the heat shrinkage sheet wound multiple times on the outside of the outer shell using a hot air gun, which significantly reduces workability, and after construction, when actually used, the layers of the heat shrinkage sheet wound multiple times forming the casing (5) are separated, creating a space (gap), which reduces the sealing force, resulting in problems such as reduced airtightness, heat retention, and water leak prevention functions.

In addition, when the inner tube (1) and the inner tube (1) are connected by a fitting, the heat shrinkable sheet or casing (5) is heated and joined on both outer sides of the polyethylene tube (3), which is the outer tube, so the workability is significantly reduced and the problem of inconvenience in use occurs;

In addition, in order to insert the polyethylene pipe, which is the outer shell (3) of the double insulation pipe, into the casing (5), the diameter of the casing (5) must be formed larger than the diameter of the polyethylene pipe, which is the outer shell (3), making installation inconvenient and increasing the material cost.

As the diameter of the casing (5) becomes larger, a space is created between the casing (5) and the outer shell (3), which is a polyethylene pipe, and this causes problems in that the sealing function, heat preservation function, and water leakage prevention function are reduced.

To prevent this, the space created between the casing (5) and the outer shell (3), which is a polyethylene pipe, must be finished separately, which significantly reduces workability and significantly increases the number of casting operations.

In addition, since the casing (5) is heated on both outer sides of the polyethylene pipe, which is the outer shell (3) of the double insulation pipe, and joined as one piece;

When repairs are required including partial damage to the inner tube (1) or outer tube (3) of the double insulation tube (10), or when repairs are required including partial damage to the casing (5),

By destroying or cutting the entire inner tube (1) or outer tube (3) and casing (5) of a double insulation pipe where partial damage has occurred, and then reinstalling or replacing the inner tube or outer tube and casing:

It is difficult to repair only the corresponding repair surface of the double insulation pipe (10), workability is significantly reduced, repair costs increase, and use is inconvenient.

In particular, the following is a damaged state of the double insulation pipe casing (5):

A double insulation pipe (10) with a casing (5) installed on the outside of the connection part is used as a double insulation pipe buried underground.

The casing (5) moves left and right due to soil load, and the load-bearing capacity of the double insulation pipe (10) connection where the casing (5) is installed is reduced, so the casing (5) is damaged or deformed, making it difficult to use;

When used for a long period of time, the casing (5) is damaged or deformed due to soil load, which causes leakage of the double insulation pipe (10) including the casing (5), and significantly reduces the insulation, durability, corrosion resistance, and bonding strength, making it difficult to use.

(Damage condition of casing for conventional double-insulated pipe)

Therefore, a dual heat shrinkable casing having a double structure according to the manufacturing and installation method of the present invention is installed outside the connecting portion of a plurality of double insulation pipes, thereby strengthening the load-bearing capacity of the double insulation pipe connecting portion due to soil load;

The double insulation pipe, including the heat shrink casing, has improved leak prevention, heat retention, durability, and bonding strength, and can be recycled as it is made from 100% recycled raw materials;

When repairs to the double insulation pipe are required, the repair surface can be repaired quickly and easily, improving workability and reducing repair costs;

There is an urgent need to develop a 'method for manufacturing and installing a dual heat shrinkable casing with reinforced joints of double insulation pipes' that is easy to manufacture and install and more convenient to use.

Patent Documents

(Patent Document 1) Republic of Korea Registered Patent No. 0839205

(Patent Document 2) Republic of Korea Registered Patent No. 0625893

(Patent Document 3) Republic of Korea Registered Patent No. 1147507

(Patent Document 4) Republic of Korea Registered Patent No. 1382415

(Patent Document 5) Republic of Korea Registered Patent No. 1400290

By the 'manufacturing and installation method of a dual heat-shrinkable casing with reinforced connection part of a double insulation pipe' of the present invention, the problems of the prior art are solved;

In particular, a dual heat shrinkable casing of the double structure of the present invention is installed outside the connection part of the double insulation pipe, so that the load bearing capacity of the double insulation pipe connection part due to soil load is strengthened;

The double-insulated pipe, including the heat-shrink casing, has improved leak prevention, heat retention, durability, and bonding strength, and can be recycled as it is made from 100% recycled raw materials;

When repairs to the double insulation pipe are required, the repair surface can be repaired quickly and easily, improving workability and reducing repair costs;

The purpose of the present invention and the technical problem to be solved by the present invention are to provide a 'method for manufacturing and installing a dual heat-shrinkable casing with reinforced connecting portions of double insulation pipes' which is easy to manufacture and install and more convenient to use.

In the composition of the present invention, 『 Step S1: A step of manufacturing a composite polyethylene cross-linked sheet by extruding a composite polyethylene composition at an extrusion temperature of 220 to 240°C, and then winding, cooling, and winding the composite polyethylene cross-linked sheet, winding it on a rotatable jig, and bonding the composite polyethylene cross-linked sheet at an air pressure and an electric heater temperature of 110 to 270°C, processing it into a cylindrical casing, and manufacturing a first heat-shrinkable casing having a chamfered surface at both ends of the cylindrical casing at an angle of 30 to 60 degrees; and,

S2 step: a step in which an adhesive layer, mastic or hot melt, is attached to the inside of both sides of the first heat-shrinkable casing; and,

Step S3: A step in which a composite polyethylene composition is extruded at an extrusion temperature of 210 to 250°C to produce a composite polyethylene cross-linked sheet, which is then wound, cooled, and wound, and then wound on a rotatable jig to bond the composite polyethylene cross-linked sheet at an air pressure and an electric heater temperature of 110 to 270°C to produce a second heat-shrinkable casing processed into a cylindrical casing; and

S4 Step: Manufacturing method of the step of attaching an adhesive layer, mastic or hot melt, to the inside of both sides of the second heat-shrinkable casing;

『 Step S11: A step of laminating a first heat-shrinkable casing with a mastic or hot melt adhesive layer attached to the center of a double-insulated pipe joint, and then shrinking the first heat-shrinkable casing by gas or electric heating and fusing the mastic or hot melt adhesive layer to thereby fuse and cool the first heat-shrinkable casing and install it at the center of the double-insulated pipe joint; and,

Step S12: A step of forming a forming hole filled with insulation material on the outside of the first heat shrinkable casing fused to the center of the double-insulated pipe joint, filling the insulation material with a pressure of 0.5 BAR, and installing a plug on the outside of the first heat shrinkable casing; and

Step S13: After installing a second heat-shrinkable casing having an adhesive layer of mastic or hot melt attached to both sides of a first heat-shrinkable casing with insulation material filled and a plug installed, the second heat-shrinkable casing is shrunk by gas or electric heating and the adhesive layer of mastic or hot melt is fused so that the second heat-shrinkable casing is fused and cooled and installed at the joint of the first heat-shrinkable casing and the double insulation pipe; The above problem is solved by the 'Method for Manufacturing and Installing a Dual Heat-Shrinkable Casing with Reinforced Joint of a Double Insulation Pipe' consisting of the 'Installation Method'.

According to the "manufacturing and installation method of a dual heat shrinkable casing with reinforced connection part of a double insulation pipe" of the present invention,

Solving the problems of prior art, and

In particular, the effect of strengthening the load-bearing capacity of the double insulation pipe connection due to soil load;

The double insulation pipe including the heat shrink casing has improved leak prevention, heat retention, durability, and bonding strength;

The effect of being 100% recyclable from renewable raw materials;

When repairs to the double insulation pipe are required, the repair surface can be repaired quickly and easily, resulting in improved workability and reduced repair costs;

It is a very useful invention, easy to manufacture and install, and has a more convenient effect when used.

Figures 1a and 1b are cross-sectional views of a conventional double-insulated pipe with a heat-shrinkable casing installed on the outside.
Figure 1c is a cross-sectional view of the inner tube ends of two conventional double-insulated pipes joined together.
Figure 1d is a cross-sectional view of a state in which heat is applied by moving a conventional heat shrinkable casing toward the connection part of two double insulation tubes.
Figure 1e is a cross-sectional view of a conventional heat-shrinkable casing that is shrunk and sealed and filled with urethane inside.
Figure 2 is a schematic diagram schematically illustrating a method for manufacturing a dual heat-shrinkable casing of the present invention.
Figure 3 is a schematic diagram schematically illustrating a method for installing a dual heat-shrinkable casing of the present invention.
Figure 4 is a reference drawing showing the installation state of the dual heat shrinkable casing of the present invention.
Figure 5 is an exploded reference drawing of a double insulation pipe in which a dual heat shrinkable casing of the manufacturing and installation method of the present invention is installed at a connecting portion of the double insulation pipe.
Figures 6 and 7 are reference drawings of the double insulation pipe joints in which the dual heat shrinkable casing of the manufacturing and installation method of the present invention is installed at the connecting portion of the double insulation pipe.

Hereinafter, the “manufacturing and installation method of a dual heat-shrinkable casing with reinforced connection portion of a double insulation pipe” of the present invention will be described in detail with reference to the attached drawings;

also, The manufacturing and installation method of a dual heat-shrinkable casing with a reinforced connection section of a double insulation pipe constituting the present invention;

'Solving the problems of conventional technology, and

In particular, a dual heat shrinkable casing of the double structure of the present invention is installed outside the connection part of the double insulation pipe, so that the load bearing capacity of the double insulation pipe connection part due to soil load is strengthened;

The leak prevention, heat retention, durability, and bonding strength of the double insulation pipe including the heat shrink casing are further enhanced, and the dual heat shrink casing can be recycled as 100% recycled raw materials;

When repairs to the double insulation pipe are required, the repair surface can be repaired quickly and easily, improving workability and reducing repair costs;

Easy to manufacture and install, and more convenient to use;

It is clarified that it consists of "a method for manufacturing and installing a dual heat shrinkable casing with a reinforced joint of a double insulation pipe of an appropriate configuration";

In addition, the numerical values mentioned in the manufacturing and installation method of the dual heat-shrinkable casing with reinforced connection portion of the double insulation pipe of the present invention are not simply numerical values, but are composed of the corresponding numerical values of the appropriate manufacturing and installation method equipped with the above-mentioned advancement through the applicant's much time and effort;

The following examples are only preferred embodiments, and the present invention is not limited to these embodiments, and it is made clear that 'the manufacturing and installation methods of the double insulation pipe and casing composed of the same technical idea are included in the present rights.'

In addition, the 'composition and composition of the article' mentioned in the present invention is described only to help understanding of the present invention;

It is made clear that the applicant of the present invention has filed a separate patent on the same date as the present invention, entitled 'Dual heat shrinkable casing with reinforced connection portion of double insulation pipe and dual heat shrinkable casing composition' .

Figure 2 is a schematic diagram schematically illustrating a method for manufacturing a dual heat-shrinkable casing of the present invention.

Figure 3 is a schematic diagram schematically illustrating a method for installing a dual heat-shrinkable casing of the present invention.

Figure 4 is a reference drawing showing the installation state of the dual heat shrinkable casing of the present invention.

Figure 5 is an exploded reference drawing of a double insulation pipe in which a dual heat shrinkable casing of the manufacturing and installation method of the present invention is installed at a connecting portion of the double insulation pipe.

Figures 6 and 7 are reference drawings of the double insulation pipe joints in which the dual heat shrinkable casing of the manufacturing and installation method of the present invention is installed at the connecting portion of the double insulation pipe.

As shown in Fig. 2; (Item composition: see Figs. 5 to 7)

The 'method for manufacturing a dual heat-shrinkable casing (100) with reinforced connection of a double-insulated pipe' of the present invention, which supplies heat generated in a combined heat and power plant or a waste incinerator to a large area including an apartment complex or a commercial building through a district heating system, or supplies hot water for tap water or industrial use, consists of the following steps S1 to S4.

Step S1: A composite polyethylene composition is extruded at an extrusion temperature of 220 to 240°C to produce a composite polyethylene crosslinked sheet, which is then wound, cooled, and wound, and then wound on a rotatable jig, and the composite polyethylene crosslinked sheet is processed into a cylindrical casing by bonding at an air pressure and an electric heater temperature of 110 to 270°C. And, a step of manufacturing a first heat-shrinkable casing having chamfered surfaces at both ends of the cylindrical casing at an angle of 30 to 60 degrees;

Step S2: A step in which an adhesive layer, mastic or hot melt, is attached to the inside of both sides of the first heat-shrinkable casing;

Step S3: A step in which a composite polyethylene composition is extruded at an extrusion temperature of 210 to 250°C to produce a composite polyethylene cross-linked sheet, which is then wound, cooled, and wound, and then wound on a rotatable jig to bond the composite polyethylene cross-linked sheet under pneumatic and electric heating temperatures of 110 to 270°C, thereby producing a second heat-shrinkable casing processed into a cylindrical casing;

Step S4: A step in which an adhesive layer, mastic or hot melt, is attached to the inside of both sides of the second heat-shrinkable casing;

The above step S1;

The method comprises the steps of: manufacturing a composite polyethylene crosslinked sheet by extruding a composite polyethylene composition having different densities of 20 to 65 wt% of high-density polyethylene (HDPE), 20 to 45 wt% of linear low-density polyethylene (LLDPE), and 15 to 35 wt% of low-density polyethylene (LDPE) at an extrusion temperature of 220 to 240°C; winding the composite polyethylene crosslinked sheet onto a winding roll, cooling it, winding it on a winder, and then winding it on a rotatable jig; bonding the composite polyethylene crosslinked sheet at an air pressure and heater temperature of 110 to 270°C; processing the composite polyethylene crosslinked sheet into a cylindrical casing; and manufacturing a first heat-shrinkable casing (30) having chamfered surfaces (31) formed at 30 to 60 degree angles at both ends of the cylindrical casing.

The above step S2;

It consists of a step in which a mastic or hot melt adhesive layer (50) is attached and cooled on both sides of the first heat-shrinkable casing.

The above step S3;

The method comprises the steps of manufacturing a composite polyethylene crosslinked sheet by extruding a composite polyethylene composition having different densities of 50 to 85 wt% of high-density polyethylene (HDPE), 10 to 40 wt% of linear low-density polyethylene (LLDPE), and 5 to 10 wt% of low-density polyethylene (LDPE) at an extrusion temperature of 210 to 250°C, and then winding the composite polyethylene crosslinked sheet onto a winding roll, cooling it, winding it on a winder, and then winding it on a rotatable jig, bonding the composite polyethylene crosslinked sheet under pneumatic pressure and at an electric heater temperature of 110 to 270°C, and manufacturing a second heat-shrinkable casing (40) processed into a cylindrical casing.

The above step S4;

It consists of a step in which an adhesive layer (50), mastic or hot melt, is attached and cooled on both sides of the second heat-shrinkable casing (40).

Therefore, in step S1 of the present invention, a first heat-shrinkable casing (30) having chamfered surfaces (31) at both ends of a cylindrical casing at an angle of 30 to 60 degrees is manufactured.
A second heat shrinkable casing (40) is manufactured by attaching, cooling, and forming an adhesive layer (50) of mastic or hot melt to the inside of both sides of the second heat shrinkable casing (40).

delete

In addition, as shown in FIG. 3 and FIG. 4, the first heat-shrinkable casing (30) manufactured in steps S1 and S2 is shrunk to the outside of the inner tube located at the joint (connection) of the double insulation pipe (20) and the adhesive layer (50) of mastic or hot melt attached to the inside of both sides of the first heat-shrinkable casing (30) is fused, so that the first heat-shrinkable casing (30) is fused and cooled and installed at the center of the joint (connection) of the double insulation pipe (20).

A second heat-shrinkable casing (40) having a mastic or hot melt adhesive layer (50) attached to both sides of a first heat-shrinkable casing (30) installed at the center of a joint of a double-insulated pipe (20) is shrunk and the mastic or hot melt adhesive layer (50) attached to the inside of both sides of the second heat-shrinkable casing (40) is fused, so that the second heat-shrinkable casing (40) is fused and cooled and installed at the joint of the first heat-shrinkable casing (30) and the double-insulated pipe (20).
In addition, the double insulation tube (20);
It consists of an inner pipe, which is a steel pipe through which hot water flows, and an outer shell made of synthetic resin material including high-density polyethylene (HDPE) that wraps the outer surface of the inner pipe, and a first heat-shrinkable casing (30) is fused and cooled and installed at the center of the joint (connection) of the double insulation pipe (20).
The inner tube is depicted as a solid line drawn in the center of the double insulation tube (20), and the outer tube is depicted as a solid line drawn in the upper and lower parts of the double insulation tube (see Figures 4 to 6).

As shown in FIG. 3 and FIG. 4; (manufacturing method: see FIG. 2, product composition: see FIG. 5 to FIG. 7)

The 'Installation method of a dual heat-shrinkable casing (100) with reinforced connection of a double-insulated pipe' of the present invention, which supplies heat generated from a combined heat and power plant or a waste incinerator to a large area including an apartment complex or a commercial building through a district heating system, or supplies hot water for tap water or industrial use, consists of the following steps S11 to S12.

Step S11: A step of laminating a first heat-shrinkable casing with an adhesive layer of mastic or hot melt attached to the center of a double-insulated pipe joint, and then shrinking the first heat-shrinkable casing by gas or electric heating and fusing the adhesive layer of mastic or hot melt, thereby fusing and cooling and installing the first heat-shrinkable casing at the center of the double-insulated pipe joint;

Step S12: A step of forming a forming hole filled with insulation material on the outside of the first heat-shrinkable casing fused to the center of the double-insulated pipe joint, filling the insulation material at a pressure of 0.5 BAR, and installing a plug on the outside of the first heat-shrinkable casing;

Step S13: A step in which a second heat-shrinkable casing having an adhesive layer of mastic or hot melt attached to both sides of a first heat-shrinkable casing filled with insulation and having a plug installed is installed, and then the second heat-shrinkable casing is shrunk by gas or electric heating and the adhesive layer of mastic or hot melt is fused so that the second heat-shrinkable casing is fused and cooled and installed at the joint of the first heat-shrinkable casing and the double insulation pipe;

The above step S11;

The method comprises the steps of laminating a first heat-shrinkable casing (30) to which an adhesive layer (50) of mastic or hot melt is attached on the outside of an inner tube located at a joint (connection) of a double-insulated pipe (20), marking the shrinkage area on both sides of the first heat-shrinkable casing (30) to be less than 460 mm, heating the shrinkage area on both sides of the first heat-shrinkable casing (30) by gas heating or electric heating, so that the first heat-shrinkable casing (30) shrinks on the outside of the inner tube located at the joint of the double-insulated pipe (20), and fusing the adhesive layer (50) of mastic or hot melt attached to the inside of both sides of the first heat-shrinkable casing (30), so that the first heat-shrinkable casing (30) is fused and cooled and installed at the center of the joint of the double-insulated pipe.

The above step S12;

In step S11, a forming hole filled with insulation is formed on the outside of the first heat-shrinkable casing (30) that is fused and installed at the center of the double-insulated pipe joint, and the insulation is injected and filled into the forming hole at a filling pressure of 0.5 BAR, and a plug capable of checking the filling state of the insulation is installed on the outside of the first heat-shrinkable casing (30).

The above step S13;

In step S12, the second heat-shrinkable casing (40) having an adhesive layer (50) of mastic or hot melt attached to the end of both sides of the first heat-shrinkable casing (30), which is the connection part (the connection part where the second heat-shrinkable casing is connected), is installed at the joint of the double-insulated pipe with the insulation material filled and plugged, and then the second heat-shrinkable casing (40) is shrunk by gas heating or electric heating and the adhesive layer (50) of mastic or hot melt attached to the inside of both sides of the second heat-shrinkable casing (40) is fused, so that the second heat-shrinkable casing (40) is fused and cooled and installed at the joint of the first heat-shrinkable casing (30) and the double-insulated pipe (20).

In addition, a second heat shrinkage casing (40) is connected to the ends of both sides of the first heat shrinkage casing (30) which has a chamfered surface (31) at an angle of 30 to 60 degrees, and is 40 to 60 mm long.
The friction coefficient of the first and second heat shrinkage casings (30, 40) and the double insulation pipe (20) is reduced due to the soil load transmitted in the vertical direction, thereby preventing the left and right movement of the first and second heat shrinkage casings (30, 40) and the double insulation pipe (20), and the load bearing capacity is further strengthened.

By the installation method of the above steps S11 to S13, a first heat shrinkable casing (30) in which a heat shrinkable sheet made of a composite polyethylene resin material with different densities is processed into a cylindrical casing is installed on the outside of the inner tube located at the joint of the double insulation pipe (20).

The invention comprises a method for installing a dual heat-shrinkable casing (100) having a reinforced connection portion of a double-insulating tube, wherein a first heat-shrinkable casing (30) is installed on both sides of the first heat-shrinkable casing (30), wherein heat-shrinkable sheets made of a composite polyethylene resin material having different densities are processed into a cylindrical casing and both ends of the cylindrical casing are provided with chamfered surfaces (31) chamfered at an angle of 30 to 60 degrees, and a mastic or hot melt adhesive layer (50) provided on both inner surfaces of the first heat-shrinkable casing (30) and a mastic or hot melt adhesive layer (50) provided on the inside of one side of the second heat-shrinkable casing (40) or on the inside of the connection surface with the first heat-shrinkable casing (30) are fused and installed.

Therefore, the 'method for manufacturing and installing a dual heat shrinkable casing (100) with reinforced connection of a double insulation pipe' of the present invention solves the problems of the prior art;

In particular, the first and second heat shrinkage casings (30, 40), which are dual heat shrinkage casings of the double structure of the present invention, are installed outside the connection part (joint part) of the double insulation pipe (20).

A method of manufacturing and installing a double insulation pipe (20) equipped with a dual heat-shrinkable casing (100) of the present invention, in which the left-right movement of the first and second heat-shrinkable casings (30, 40), which are dual heat-shrinkable casings (100), is prevented when buried underground, the load-bearing capacity is strengthened so that the soil load transferred from the soil is firmly supported, and the load-bearing capacity of the connection part of the double insulation pipe (20) due to the soil load is also further strengthened;

A manufacturing and installation method for a double insulation pipe (20) including the first and second heat shrinkable casings (30, 40) with enhanced leakage prevention, heat retention, durability, and bonding strength;

Manufacturing and installation methods in which the first and second heat shrinkable casings (30, 40) can be recycled using 100% recycled raw materials;

When repair of a double insulation pipe equipped with a dual heat-shrinkable casing (100) of the present invention is required, a manufacturing and installation method that enables quick and easy repair of the corresponding repair surface, and improves workability and reduces repair costs;

The present invention relates to a method for manufacturing and installing a double insulation pipe equipped with a dual heat shrink casing (100) having a configuration that is easy to manufacture and install, and more convenient to use; and to a method for manufacturing and installing a dual heat shrink casing (100) having a reinforced connection portion of a double insulation pipe.

Also, as needed;

The composite polyethylene resin of the above first and second heat-shrinkable casings (30, 40) can also be manufactured by replacing it with polypropylene resin;

The above first and second heat shrinkable casings (30, 40);

It may be configured as a 'method for manufacturing and installing a dual heat shrink casing (100) with a reinforced connection section of a double heat insulation tube', which is provided with a cutting section that is heat-fused by heat transferred from a heating section on the outside of the main body of the first and second heat shrink casings (30, 40) and a heating section that is a mesh that is supplied with power and generates heat;

In addition, the first and second heat shrinkable casings (30, 40)

It may also be configured with a manufacturing and installation method that comprises a heat shrinkage casing of a single structure rather than a double structure, and a heat shrinkage casing selected from the first heat shrinkage casing (30) or the second heat shrinkage casing (40).

Hereinafter, in order to help understand the present invention, the 'dual heat shrinkable casing and dual heat shrinkable casing composition with reinforced connection portion of double insulation pipe' submitted by the applicant on the same date as the present patent will be described.

As shown in FIGS. 5 to 7; (manufacturing method: see FIG. 2, installation method: see FIGS. 3 and 4)

The 'dual heat shrinkable casing (100) with reinforced connection of double insulation pipe' of the present invention is installed outside the connection of a double insulation pipe to supply heat generated from a combined heat and power plant or a waste incinerator to a large area including an apartment complex or a commercial building through a district heating system, or to supply hot water for tap water or industrial use;

1) A first heat shrinkage casing (30) in which heat shrinkage sheets made of composite polyethylene resin material with different densities are laminated on the outside of the connection part of the double insulation pipe (20) and processed into a cylindrical casing and in which both ends of the cylindrical casing are provided with chamfered surfaces (31) at an angle of 30 to 60 degrees,

2) A second heat shrink casing (40) formed by processing heat shrink sheets made of composite polyethylene resin material with different densities into a cylindrical casing, which are provided on both sides of the first heat shrink casing (30),

3) It is composed of a mastic or hot melt adhesive layer provided on both inner surfaces of the first heat shrinkage casing (30) and a mastic or hot melt adhesive layer (50) provided on the inner surface of one side of the second heat shrinkage casing (40) or the inner surface connected to the first heat shrinkage casing (30).

The above first heat shrinkable casing (30);

A composite polyethylene resin having improved durability, corrosion resistance, and bonding strength, and is 1st reinforced with a composition of 20 to 65 wt% of high-density polyethylene (HDPE), 20 to 45 wt% of linear low-density polyethylene (LLDPE), and 15 to 35 wt% of low-density polyethylene (LDPE) with different densities, laminated on the outside of the connecting portion of a double insulation pipe (20), is composed of a composite polyethylene resin having improved processability and is 100% recyclable as a raw material.

A composite polyethylene resin composition is formed by extruding a cross-linked composite polyethylene sheet at an extrusion temperature of 220 to 240°C, winding the cross-linked composite polyethylene sheet, and then winding it on a rotatable jig to form a cylindrical casing, and forming a first heat-shrinkable casing (30) having chamfered surfaces (31) at both ends of the cylindrical casing at angles of 30 to 60 degrees.

The above second heat shrinkable casing (40) is;

The durability, corrosion resistance, and bonding strength of the composite polyethylene resin, which is composed of 50 to 85 wt% of high-density polyethylene (HDPE), 10 to 40 wt% of linear low-density polyethylene (LLDPE), and 5 to 10 wt% of low-density polyethylene (LDPE) with different densities on both sides of the first heat-shrinkable casing (30), are further enhanced, and are 100% recyclable and can be recycled, and have improved processability.

The composite polyethylene resin composition is formed by extruding a cross-linked composite polyethylene sheet at an extrusion temperature of 210 to 250°C, winding the cross-linked composite polyethylene sheet, and then winding it on a rotatable jig to form a cylindrical casing, which is then formed into a second heat-shrinkable casing (40).

In addition, the second heat shrinkage casing (40) is fused to the first heat shrinkage casing (30) and the double insulation tube (20).

The first heat shrinkage casing (30) is fused to the first heat shrinkage casing (30) which has a chamfered surface (31) at an angle of 30 to 60 degrees at both ends, so that the friction coefficient between the first and second heat shrinkage casings (30, 40) and the double heat shrinkage pipe (20) due to soil load when burying the double heat shrinkage pipe of the present invention is further minimized, and the second heat shrinkage casing (40) is formed.

Therefore, the present invention is a dual heat shrinkage casing having a double structure in which a first heat shrinkage casing (30) is laminated and installed outside the connection portion of a double heat insulation pipe (20) and a second heat shrinkage casing (40) is jointly installed on both sides of the first heat shrinkage casing (30) and the connection portion of the double heat insulation pipe (20);

The dual heat shrinkage casing having a double structure composed of the first and second heat shrinkage casings (30, 40) is joined to each other and to the double insulation pipe (20), so that when the double insulation pipe equipped with the dual heat shrinkage casing (100) of the present invention is buried underground, the left-right movement of the first and second heat shrinkage casings (30, 40), which are the dual heat shrinkage casings (100), is prevented, the load bearing capacity is strengthened, so that the soil load transferred from the soil is firmly supported, and the leakage prevention, heat retention, durability, and joint capacity of the double insulation pipe are further strengthened, and it is possible to recycle it as a 100% renewable raw material;

When repair of a double insulation pipe equipped with a dual heat shrink casing (100) of the present invention is required, the repair surface can be repaired quickly and easily, and workability is improved and repair costs are reduced, while manufacturing and installation are easy and use is made easier with the first and second heat shrink casings (30, 40) of the present invention.

The above mastic or hot melt adhesive layer (50) is;

As an adhesive layer (50) provided on both inner surfaces of the first heat-shrinkable casing (30), which is a mastic or hot melt, and as an adhesive layer (50) provided on the inner surface of one side of the second heat-shrinkable casing (40) or the inner surface connected to the first heat-shrinkable casing (30), which is a mastic or hot melt,

After connecting the first and second heat shrinkable casings (30, 40), the first and second heat shrinkable casings (30, 40) are formed into a dual heat shrinkable casing with a mastic or hot melt adhesive layer (50) formed by gas or electric heating of the first and second heat shrinkable casings (30, 40), so that the first and second heat shrinkable casings (30, 40) and the double insulation pipe (20) are easily fused and bonded, and the bonding strength is further enhanced by the mastic or hot melt adhesive layer (50).
In addition, the double insulation tube (20);
It consists of an inner pipe, which is a steel pipe through which hot water flows, and an outer shell made of synthetic resin material including high-density polyethylene (HDPE) that wraps the outer surface of the inner pipe, and a first heat-shrinkable casing (30) is fused and cooled and installed at the center of the joint (connection) of the double insulation pipe (20).
The inner tube is depicted as a solid line drawn in the center of the double insulation tube (20), and the outer tube is depicted as a solid line drawn in the upper and lower parts of the double insulation tube (see Figures 4 to 6).

Therefore, the 'dual heat shrinkable casing (100) and dual heat shrinkable casing composition with reinforced connection portion of double insulation pipe' of the present invention solves the problems of the prior art;

In particular, the first and second heat shrinkage casings (30, 40), which are dual heat shrinkage casings of a double structure of the present invention, are installed outside the connection part of the double insulation pipe (20), so that when the double insulation pipe equipped with the dual heat shrinkage casing (100) of the present invention is buried underground, the left-right movement of the first and second heat shrinkage casings (30, 40), which are dual heat shrinkage casings (100) due to soil load transmitted vertically from the soil is prevented, and the load bearing capacity of the double insulation pipe connection part due to the soil load is also further strengthened;

A technology configuration that further enhances the leakage prevention, heat retention, durability, and bonding strength of the double insulation pipe (20) including the first and second heat shrinkable casings (30, 40);

The first and second heat shrinkable casings (30, 40) have a technology configuration that allows recycling using 100% recycled raw materials;

When repair of a double insulation pipe equipped with a dual heat-shrinkable casing (100) of the present invention is required, the repair surface can be repaired quickly and easily, and the technical configuration improves workability and reduces repair costs;

The present invention provides a technical configuration in which the manufacture and installation of a double insulation pipe equipped with a dual heat shrink casing (100) is easy and the use is more convenient; it consists of a 'dual heat shrink casing (100) with reinforced connecting portion of the double insulation pipe'.

In addition, the composition of the dual heat-shrinkable casing (100) of the present invention;

A composite polyethylene resin composed of 20 to 65 wt% of high-density polyethylene (HDPE), 20 to 45 wt% of linear low-density polyethylene (LLDPE), and 15 to 35 wt% of low-density polyethylene (LDPE) with different densities, laminated on the outside of the connecting portion of the double insulation pipe (20);

The durability, corrosion resistance, and bonding strength of the first heat shrinkable casing (30) of the present invention are enhanced, and it is made of a composite polyethylene resin composition with improved processability and is 100% recyclable.

The first heat shrinkable casing (30) is provided on both sides with a composite polyethylene resin composed of 50 to 85 wt% of high-density polyethylene (HDPE), 10 to 40 wt% of linear low-density polyethylene (LLDPE), and 5 to 10 wt% of low-density polyethylene (LDPE) having different densities.

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The durability, corrosion resistance, and bonding strength of the second heat-shrinkable casing (40) of the present invention are further enhanced, and it is made of a composite polyethylene resin composition with improved processability and is 100% recyclable.

Also, as needed;

The composite polyethylene resin of the above first and second heat shrinkable casings (30, 40) may be replaced with polypropylene resin;

The above first and second heat shrinkable casings (30, 40);

A cutting section that is heat-fused by heat transferred from a heating section on the outside of the main body of the first and second heat-shrinkable casings (30, 40) and a heating section that is a mesh that generates heat by supplying power are provided;

Alternatively, it may be configured as a 'dual heat shrink casing (100) with reinforced connection of a double heat shrink tube', which has an insulation filling hole filled with insulation material for heat preservation of a double heat shrink tube on the outside of the main body of the first heat shrink casing (30), and a plug provided on the outside of the insulation filling hole to facilitate filling and foaming of the insulation material;

In addition, the first and second heat shrinkable casings (30, 40)

It may be composed of a heat shrinkage casing of a single structure rather than a double structure, and a heat shrinkage casing selected from the first heat shrinkage casing (30) or the second heat shrinkage casing (40).

Above, the present invention has been described in detail through specific examples, but the present invention is not limited to the above examples, and various modifications can be made by those skilled in the art within the scope of the technical idea of the present invention.

100: Dual heat shrink casing with reinforced connection part of the double insulation pipe of the present invention (dual heat shrink casing)
20: Double insulation tube
30: 1st heat shrink casing
31: Chamfered surface
40: Second heat shrink casing
50: Adhesive layer (mastic or hot melt adhesive layer)
60: heater
10 Conventional double insulation tube
1: Interior
2: Protective layer
3: Appearance
4: Urethane foam
5: Casing

Claims (9)

A method for manufacturing a dual heat-shrinkable casing (100) with reinforced connections of a double-insulated pipe that supplies heat to a large area including an apartment complex or a commercial building through a district heating system, or supplies hot water for tap water or industrial use;

Step S1: A step in which a composite polyethylene composition is extruded at an extrusion temperature of 220 to 240°C to produce a composite polyethylene cross-linked sheet, which is then wound, cooled, and wound, and then wound on a rotatable jig, and the composite polyethylene cross-linked sheet is bonded at an air pressure and an electric heater temperature of 110 to 270°C, processed into a cylindrical casing, and a first heat-shrinkable casing is produced, wherein both ends of the cylindrical casing are provided with chamfered surfaces chamfered at an angle of 30 to 60 degrees; and
S2 step: a step in which an adhesive layer, mastic or hot melt, is attached to the inside of both sides of the first heat-shrinkable casing; and,
Step S3: A step in which a composite polyethylene composition is extruded at an extrusion temperature of 210 to 250°C to produce a composite polyethylene cross-linked sheet, which is then wound, cooled, and wound, and then wound on a rotatable jig to bond the composite polyethylene cross-linked sheet at an air pressure and an electric heater temperature of 110 to 270°C to produce a second heat-shrinkable casing processed into a cylindrical casing; and
S4 Step: A method for manufacturing a dual heat-shrinkable casing (100) with a reinforced connection portion of a double insulation pipe, characterized in that it is manufactured by a step of attaching an adhesive layer, mastic or hot melt, to the inside of both sides of the second heat-shrinkable casing. In the first paragraph, the S1 step;

A method for manufacturing a dual heat-shrinkable casing (100) with a reinforced connection portion of a double insulation pipe, characterized in that a composite polyethylene composition comprising 20 to 65 wt% of high-density polyethylene with different densities, 20 to 45 wt% of linear low-density polyethylene, and 15 to 35 wt% of low-density polyethylene is extruded at an extrusion temperature of 220 to 240°C to produce a cross-linked composite polyethylene sheet, which is then wound on a winding roll, cooled, wound on a winder, and then wound on a rotatable jig, and the composite polyethylene cross-linked sheet is bonded and processed at an air pressure and heater temperature of 110 to 270°C, and a first heat-shrinkable casing having a chamfered surface at both ends of the cylindrical casing is manufactured. In the first paragraph, the S3 step;
A composite polyethylene composition comprising 50 to 85 wt% of high-density polyethylene (HDPE) having different densities, 10 to 40 wt% of linear low-density polyethylene (LLDPE), and 5 to 10 wt% of low-density polyethylene (LDPE) is extruded at an extrusion temperature of 210 to 250°C to produce a composite polyethylene crosslinked sheet, which is then wound on a winding roll, cooled, wound on a winder, and then wound on a rotatable jig, and the composite polyethylene crosslinked sheet is bonded at an air pressure and an electric heater temperature of 110 to 270°C to produce a second heat-shrinkable casing processed into a cylindrical casing. A method for manufacturing a dual heat shrinkable casing (100) characterized by having a reinforced connection section of a double insulation pipe. In paragraph 1,
The first heat-shrinkable casing manufactured in the above S1 and S2 steps is shrink-bonded to the outside of the inner tube located at the double-insulated pipe joint, and the adhesive layer, mastic or hot melt, attached to the inside of both sides of the first heat-shrinkable casing is fused, so that the first heat-shrinkable casing is fused and cooled and installed at the center of the double-insulated pipe joint.
A method for manufacturing a dual heat-shrinkable casing (100) with a reinforced connection portion of a double-insulated pipe, characterized in that a second heat-shrinkable casing having a mastic or hot melt as an adhesive layer attached to both sides of a first heat-shrinkable casing installed at the center of a double-insulated pipe joint is shrunk and a mastic or hot melt as an adhesive layer attached to the inside of both sides of the second heat-shrinkable casing is fused, so that the second heat-shrinkable casing is fused and cooled and installed at the double-insulated pipe joint with the first heat-shrinkable casing. delete delete delete delete Supplying heat to a large area including an apartment complex or a commercial building through a district heating system, or supplying hot water for tap water or industrial hot water, step S11: A step of laminating a first heat-shrinkable casing with an adhesive layer of mastic or hot melt attached to the center of a double-insulated pipe (20) joint, and then shrinking the first heat-shrinkable casing by gas or electric heating and fusing the adhesive layer of mastic or hot melt so that the first heat-shrinkable casing is fused and cooled and installed at the center of the double-insulated pipe joint; and, step S12: A step of forming a forming hole in which insulation is filled on the outside of the first heat-shrinkable casing fused and installed at the center of the double-insulated pipe joint, and filling the insulation with a pressure of 0.5 BAR, and installing a plug on the outside of the first heat-shrinkable casing; and, step S13: A step of attaching mastic or hot melt as an adhesive layer to both sides of the first heat-shrinkable casing filled with insulation and having a plug installed In a method for installing a dual heat-shrinkable casing (100) with a reinforced connection portion of a double insulation pipe, the method comprises the steps of: installing the second heat-shrinkable casing by gas or electric heating, shrinking the second heat-shrinkable casing, and fusing the adhesive layer, mastic or hot melt, to thereby fuse and cool the second heat-shrinkable casing to the joint portion of the first heat-shrinkable casing and the double insulation pipe;

On the outside of the connection part of the above double insulation pipe (20), a heat shrinkable sheet made of a composite polyethylene resin material with different densities is processed into a cylindrical casing. A first heat shrinkable casing (30) having chamfered surfaces (31) at both ends of the cylindrical casing at an angle of 30 to 60 degrees is installed,
A method for installing a dual heat-shrinkable casing (100) with a reinforced connection portion of a double insulation pipe, characterized in that a second heat-shrinkable casing (40) is installed on both sides of a first heat-shrinkable casing (30) having the chamfered surface (31) provided thereon, wherein a heat-shrinkable sheet made of a composite polyethylene resin material having different densities is processed into a cylindrical casing, and a mastic or hot melt adhesive layer provided on both inner sides of the first heat-shrinkable casing (30) and a mastic or hot melt adhesive layer (50) provided on the inside of one side of the second heat-shrinkable casing (40) or the inside of the connection surface with the first heat-shrinkable casing (30) are fused and installed.

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