KR102558539B1 - Integrated fireproof cable and manufacturing method thereof - Google Patents

Abstract

The present invention relates to an integral fire resistant cable having fire resistant performance in cables used in suspension bridges, cable-stayed bridges, arch bridges and building structures, and to a method for manufacturing the same, and more particularly, to a fire resistant cable divided into a fire resistant section and a non fire resistant section according to set design standards, including a first cable forming a fire resistant section, a second cable forming the non fire resistant section, and a socket fastened to ends of the first cable and the second cable, respectively, wherein the first cable comprises a plurality of steel It is characterized by including a cable body in which wires are twisted, a wrapping tape wound around the outer periphery of the cable body, a fire resistant material laminated to surround the outer periphery of the wrapping tape, and one or more coating layers laminated to surround the outer periphery of the fire resistant layer.

Description

Integrated fireproof cable and manufacturing method thereof {Integrated fireproof cable and manufacturing method thereof}

The present invention relates to an integrated fire-resistant cable having fire-resistant performance in cables used for suspension bridges, cable-stayed bridges, arch bridges, and building structures, and a method for manufacturing the same.

A bridge is a structure whose main function is to connect traffic routes across rivers, rivers, seas, lakes, or across valleys.

There are various types of bridges, such as ramen bridges, arch bridges, truss bridges, cable-stayed bridges, and suspension bridges, which are selected in consideration of the length of the bridge, the surrounding environment, the type of load passing through the bridge, and aesthetics. In the meantime, the construction of long-span bridges has been steadily increasing as materials and construction technology have developed and the economic level has increased. Also, in recent years, super-large bridges connecting the mouths of large rivers or bays have been built or are under construction.

In the case of the construction of such a bridge, vehicle collision accidents occur frequently due to severe weather changes such as fog and wind speed on the upper part of the bridge, which deteriorates the vehicle driving environment.

On the other hand, the cable that is connected to the bridge and transmits the load of the bridge deck is made of steel wire, and as the superstructure of the bridge, it is the most important member element of the bridge.

In the case of ordinary parallel steel cable, high-density polyethylene outside the cable provides sealing and anti-corrosion effects, but HDPE is a combustible material that ignites in case of fire, accelerating the spread of fire and accelerating the temperature. The lack of fire resistance is a fatal weakness of the cable. In particular, the temperature of 800 ℃ ~ 1000 ℃ has a great influence on the performance of the steel wire.

As such, if the cable is close to the road and a fire occurs on the bridge, the possibility of a fire in the cable is obvious, and when the cable is exposed to heat, the strength and stiffness are significantly lowered.

Republic of Korea Patent Publication No. 10-2012-0003208 (2012.01.10)

Accordingly, the present invention has been made to solve the above problems, and an object of the present invention is to provide an integrated fire resistant cable having a simple structure, excellent fire resistance and durability, and a stable manufacturing process, thereby providing economic advantages and a method for manufacturing the same.

As a means for solving the above problems, the integrated fire resistant cable of the present invention is a fire resistant cable divided into a fire resistant section and a non fire resistant section according to a set design standard, and includes a first cable forming a fire resistant section, a second cable forming a non fire resistant section, and a socket fastened to one end of the first cable and the second cable, respectively, wherein the first cable includes a cable body in which a plurality of steel wires are twisted together, and a wrapping frame wound around the outer periphery of the cable body. It is characterized in that it includes a tape, a fire resistant layer formed of a material having fire resistance and laminated to surround the outer periphery of the wrapping tape, and one or more coating layers laminated to surround the outer circumference of the fire resistant layer.

As an example, the fire resistant layer is characterized in that a fire resistant material in the form of a sheet having fire resistance is spirally wound around the outer periphery of the wrapping tape and stacked.

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As an example, the fire resistant layer is characterized in that a liquid fire resistant material having fire resistance is coated on the outer periphery of the wrapping tape by an extrusion process and then laminated.

As an example, the fire resistant layer is characterized in that it is formed to a thickness of 1 mm to 20 mm.

On the other hand, in the manufacturing method of the integrated fire resistant cable of the present invention, in the method for manufacturing a fire resistant cable separated and configured into a first cable forming a fire resistant section and a second cable forming a non fire resistant section according to set design standards, forming a cable body by twisting a plurality of steel wires in a spiral form through a twisting machine; winding the wrapping tape around the outer periphery of the cable body in a spiral form through a winder; laminating a fire resistant layer having a fire resistant material on the outer periphery of the wrapping tape of the first cable corresponding to the fire resistant section; and laminating a coating layer on the outer periphery of the fireproof layer of the first cable corresponding to the fireproof section and the outer periphery of the wrapping tape of the second cable corresponding to the non-fireproof section.

As an example, the step of laminating the fire resistant layer is characterized in that a fire resistant material in the form of a sheet having fire resistance is spirally wound around the outer periphery of the wrapping tape of the first cable using a winder and then laminated.

As an example, the winder includes a body drum having a hollow through which the cable body passes and having a rotating plate provided on one side for rotation and driving in a circumferential direction at a position spaced apart from the outer periphery of the cable body through which the cable body passes, a seating roller spaced apart from the rear of the body drum and seating and supporting the cable body, a drive roller spaced apart from the rear of the body drum and moving the cable body forward, and a diagonally pierced cable having a predetermined inclination. It is characterized by including one or more unwinding rollers mounted on one surface of the rotating plate so as to be close to the outer periphery of the main body and installed to unwind a sheet roll on which a sheet-shaped refractory material or wrapping tape is wound.

As an example, the winder is characterized in that the oblique direction of the unwinding roller is adjusted by further including an adjustment means capable of selectively adjusting the inclination of the unwinding roller.

As an example, the step of laminating the fire resistant layer is characterized in that a liquid type fire resistant material having fire resistance is coated on the outer periphery of the wrapping tape of the first cable by an extrusion process using an extruder and then laminated.

The integrated fire resistant cable and method for manufacturing the same according to the present invention have a simple structure and excellent fire resistance by layering a fire resistant layer on the inside during the manufacturing process of the cable without additionally mounting a fire resistant member on the outside of the cable. Also, since only one process for lamination of the fire resistant layer is added during cable manufacturing, the manufacturing process is stable, thereby minimizing the increase in manufacturing cost and manufacturing time, thereby providing an economical advantage.

In particular, when the fire-resistant layer is laminated, the fire-resistant sheet is wound in an oblique direction opposite to the oblique direction of the ramping tape to reinforce the binding effect as well as the unwinding of the ramping tape, so that the wire assembly state of the cable can be more firmly maintained. Therefore, the durability of the cable is improved.

1 is a view showing an integrated fire resistant cable of the present invention.
2 is a cross-sectional view showing a first cable forming a fire-resistant section according to an embodiment of the present invention.
3 is a cross-sectional view showing a second cable forming a non-fireproof section according to an embodiment of the present invention.
4 is a schematic view showing a manufacturing method of an integrated fire resistant cable according to an embodiment of the present invention.
5 is a schematic view showing a manufacturing method of an integrated fire resistant cable according to another embodiment of the present invention.
6 is a view showing the configuration of a winding machine according to an embodiment of the present invention.

In describing the present invention, the terms or words used in the present specification and claims are based on the principle that the inventor can appropriately define the concept of the term in order to explain his or her invention in the best way. It should be interpreted as meaning and concept consistent with the technical spirit of the present invention.

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

Referring to FIG. 1, the integrated fire resistant cable of the present invention is divided into a fire resistant section and a non-fire resistant section according to set design standards.

That is, in suspension bridges, cable-stayed bridges, etc., sections that are relatively vulnerable to deterioration due to proximity to bridges are set as fireproof sections (L1) to protect cables from fire, etc., and other sections are non-fireproof sections (L2). Can be set.

According to the section division, the integrated fireproof cable of the present invention may include a first cable 10 forming a fireproof section L1 and a second cable 20 forming a non-fireproof section L2, and in addition, a socket 30 fastened to one end of the first cable 10 and the second cable 20 to bind the first cable 10 or the second cable 20 to an anchorage or the like. .

First, as shown in FIG. 2, the first cable 10 forming the fire-resistant section L1 includes a cable body 100 in which a plurality of steel wires 101 are twisted together, a wrapping tape 110 wound around the outer circumference of the cable body 100, a fire-resistant layer 120 and the fire-resistant layer 12 that are stacked with a fire-resistant material to cover the outer circumference of the wrapping tape 110. 0) and one or more coating layers 130 stacked to surround the outer periphery.

Although the cable body 100 is not shown in the drawings, it is preferable to use a high-strength steel wire 101 suitable for bridges, but the present invention is not limited thereto, and the type and diameter of the steel wire 101 and the number of twisted wires can be selectively applied according to the design criteria of the bridge, the supporting load and the allowable stress.

And, although not shown in the drawings, the cable body 100 may have a shape in which a plurality of steel wires 101 are spirally twisted through a twisting process.

The wrapping tape 110 tapes and wraps the outer periphery of the cable body 100, thereby maintaining the assembled state of the spirally twisted cable body 100.

For example, the wrapping tape 110 may use any one of polyethylene terephthalate (PET), polyethylene (PE), polypropylene (PP), and non-woven fabric.

The fire resistant layer 120 prevents flame from directly contacting the cable body 100 in the event of a fire, and prevents or delays the transmission of high heat from the flame to the cable body 100, thereby ensuring the safety and durability of the bridge.

As the fire-resistant material constituting the fire-resistant layer 120, various conventionally known fire-resistant materials may be selected to prevent or delay the temperature rise, and a detailed description thereof will be omitted.

On the other hand, as one embodiment for laminating the fire resistant layer 120 on the outer periphery of the wrapping tape 110, the fire resistant layer 120 may have a fire resistant sheet having fire resistance (hereinafter referred to as a "fire resistant sheet") 121 spirally wound around the outer circumference of the wrapping tape 110 and stacked thereon.

The fire resistant sheet 121 may be wound through a winder 60 described below. At this time, the oblique winding direction of the fire resistant sheet 121 is set in the opposite direction to the oblique winding direction of the wrapping tape 110. It is preferable to set.

The fireproof sheet 121 basically protects the cable body 100 from deterioration according to its fire resistance performance, and by being spirally wound in the opposite direction to the wrapping tape 110, prevents the wrapping tape 110 from being loosely wound or from being unwound due to thermal expansion during the winding process. It is possible to more firmly maintain the assembled state of the cable body 100, which consequently provides an effect of improving durability of the cable.

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As another example, the fire resistant layer 120 may be coated with a fire resistant liquid type fire resistant material (hereinafter referred to as “liquid fire resistant material”) 122 on the outer periphery of the wrapping tape 110 by an extrusion process and laminated thereon.

At this time, the liquid refractory material 122 has a liquid form that can be used in a conventional extrusion process, and may be defined as including a refractory composition material.

The fire resistant layer 120 according to the above-described embodiment is preferably formed to a thickness of 1 mm to 20 mm in consideration of the overall diameter of the cable.

The coating layer 130 is laminated to surround the outer periphery of the fire resistant layer 120 .

As shown in FIG. 2, the coating layer 130 may be composed of at least one or more layers. According to an embodiment of the present invention, the coating layer 130 may include an internal HDPE coating layer 131 mainly using HDPE (High Density Polyethylene), and an external HDPE coating layer 132 laminated on the outer periphery of the internal HDPE coating layer 131.

The coating layer 130 mainly made of HDPE exhibits excellent extrusion processability and mechanical properties by having insulating properties, excellent weather resistance and thermoplasticity, and can protect the cable body 100 from the external environment.

On the other hand, the second cable 20 forming the non-fireproof section L2 includes a cable body 200 in which a plurality of steel wires 201 are twisted together, as shown in FIG. 3, a wrapping tape 210 wound around the outer circumference of the cable body 200, and one or more coating layers 230 stacked to cover the outer circumference of the wrapping tape 210.

That is, the second cable 20 forming the non-fireproof section L2 has the same configuration as the first cable 10, except that the fireproof layer 120 is not present between the wrapping tape 210 and the coating layer 230. As such, a detailed description thereof will be omitted.

Hereinafter, the manufacturing method of the integral fireproof cable of the present invention will be described with reference to FIGS. 4 to 6 .

A method for manufacturing an integral fire resistant cable according to the present invention is a method for manufacturing a fire resistant cable which is separately composed of a first cable 10 forming a fire resistant section L1 and a second cable 20 forming a non fire resistant section L2 according to set design standards, comprising the steps of forming a cable body 100, 200 by twisting a plurality of steel wires 101, 201 in a spiral form through a twisting machine, and a winding machine 60. and winding the wrapping tapes 110 and 210 around the outer periphery of the cable bodies 100 and 200 in a spiral shape.

In addition, the manufacturing method of the integrated fire resistant cable of the present invention includes the steps of laminating a fire resistant layer 120 having a fire resistant material on the outer periphery of the wrapping tape 110 of the first cable 10 requiring fire resistant performance in the fire resistant section L1, and the outer periphery of the fire resistant layer 120 of the first cable 10 corresponding to the fire resistant section L1 and the second cable 20 corresponding to the non-fire resistant section L2 A step of laminating the coating layers 130 and 230 on the outer periphery of the wrapping tape 210 is included.

In the step of forming the cable bodies 100 and 200, although not shown in the drawings, 7 to 700 high-strength steel wires 101 and 201 are twisted at a spiral angle of 1 to 10 ° using a twisting machine to form a bundle.

In addition, wrapping tapes 110 and 210 are spirally wound around the outer periphery of the cable bodies 100 and 200 so that the bundled state of the spirally stranded cable bodies 100 and 200 can be maintained.

Subsequently, the step of laminating the fire resistant layer 120 on the first cable 100 requiring fire resistance performance is performed. In the present invention, as shown in FIG.

As shown in FIG. 6, the winder 60 according to the present embodiment includes a body drum having a hollow through which the cable body 100 passes and having a rotation plate 620 rotationally driven in the circumferential direction at a position spaced apart from the outer circumference of the cable body 100 through which the cable body 100 passes, and a set roller 600 spaced apart from the rear of the body drum and placing and supporting the cable body 100, A drive roller 610 spaced apart from the rear of the main drum and moving the cable main body 100 forward, and one or more drive rollers 630 mounted on one side of the rotating plate 620 so as to be close to the outer circumference of the cable main body 100 penetrating obliquely with a predetermined inclination and unwinding the sheet roll on which the fireproof sheet 121 or the wrapping tape 110 is wound can be unwound. can

After the cable body 100 is placed on the set roller 600 and the drive roller 610, when the rotation motor connected to the drive roller 610 is operated, the cable body 100 is moved forward and sequentially passes through the hollow of the body drum.

In addition, the rotating plate 620 mounted on the front side of the main drum rotates in the circumferential direction around the cable main body 100 sequentially passing through the front of the main drum by a driving force provided from the outside.

In this process, when the front end of the fireproof sheet 121 or ramping tape 110 wound around the unwinding roller 630 is attached to the cable body 100, the cable body 100 is moved by the drive roller 610 and the fireproof sheet 121 or the ramping tape 110 is automatically rotated in the circumferential direction of the unwinding roller 630. ) is wound in an oblique direction on the outer periphery.

At this time, it is preferable to set the oblique winding direction of the fireproof sheet 121 to be opposite to the oblique winding direction of the wrapping tape 110 .

Accordingly, the winder 60 further includes an adjusting unit capable of selectively adjusting the inclination of the unwinding roller 630 so as to adjust the oblique winding direction of the unwinding roller 630. After selecting an appropriate sheet roll for each winding process of the wrapping tape 110 or the winding process of the fireproof sheet 121, the unwinding roller 630 is replaced, and the adjustment means is adjusted so that the oblique winding direction is opposite to each other. do

Here, the adjustment unit may be a connecting arm connecting the rotating plate 620 and the unwinding roller 630, and allows the tilt of the unwinding roller 630 to be adjusted from the rotating plate 620 according to the connecting direction of the connecting arm.

The fire-resistant sheet 121 basically protects the cable body 100 from deterioration according to its fire resistance performance, and as described above, by being spirally wound in the opposite direction to the wrapping tape 110, it prevents the wrapping tape 110 from being loosely wound or unwinding due to thermal expansion during the winding process. The assembled state of the twisted pair cable body 100 can be maintained more firmly.

As another embodiment, in the step of laminating the fire resistant layer 120, as shown in FIG. 5, the liquid fire resistant material 122 may be coated on the outer circumference of the wrapping tape 110 of the first cable 10 by an extrusion process using a single extruder and laminated.

Here, the structure of the single extruder 50 and its extrusion molding method can be variously implemented through known techniques, and a detailed description thereof will be omitted.

After the fire-resistant layer 120 is laminated on the first cable 10, the coating layers 130 and 230 are laminated on the outer periphery 120 of the fire-resistant layer of the first cable 10 and the outer periphery of the wrapping tape 210 of the second cable 20, which is the non-fire-resistant section L2.

As in the embodiment shown in FIG. 2, the coating layer 130 may include internal HDPE coating layers 131 and 231 mainly using HDPE (High Density Polyethylene), and external HDPE coating layers 132 and 232 laminated on the outer periphery of the internal HDPE coating layers 131 and 231.

When the coating layer 130 is composed of a plurality of layers as described above, as shown in FIG. 5, the inner HDPE coating layers 131 and 231 and the outer HDPE coating layers 132 and 232 are preferably formed through one process using the double extruder 40.

The structure and extrusion molding method of the double extruder 40 can also be variously implemented through known techniques, and a detailed description thereof will be omitted.

Although the preferred embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements of those skilled in the art using the basic concepts of the present invention defined in the following claims are also within the scope of the present invention.

10: first cable 20: second cable
30: socket 40: dual extruder
50: single extruder 60: winder
100, 200: cable body 101, 201: steel wire
110, 210: Wrapping tape 120: Fireproof layer
130, 230: coating layer 131, 231: inner HDPE coating layer
132, 232: outer HDPE coating layer

Claims (10)

delete delete delete delete delete A method for manufacturing a fire resistant cable that is separately configured into a first cable forming a fire resistant section and a second cable forming a non fire resistant section according to set design criteria,
Forming a cable body by twisting a plurality of steel wires in a spiral form through a twisting machine;
winding the wrapping tape around the outer periphery of the cable body in a spiral form through a winder;
forming a fire-resistant layer by winding and stacking a fire-resistant sheet made of a fire-resistant material in a spiral shape around the outer periphery of the wrapping tape of the first cable corresponding to the fire-resistant section using a winder; and
Laminating a coating layer on the outer periphery of the fireproof layer of the first cable corresponding to the fireproof section and the outer periphery of the wrapping tape of the second cable corresponding to the non-fireproof section,
The winder,
A body drum having a hollow through which the cable body passes and having a rotating plate provided on one side for rotation and driving in a circumferential direction at a position spaced from the outer periphery of the cable body through which the cable body passes, a seating roller spaced apart from the rear of the body drum and seating and supporting the cable body, a driving roller spaced apart from the rear of the body drum and moving the cable body forward, and a diagonally pierced outer periphery of the cable body having a predetermined inclination. One or more unwinding rollers mounted on one side of the rotating plate and installed so that the sheet roll on which the wrapping tape or the refractory material is wound can be unwound, and an adjustment means for adjusting the oblique direction of the unwinding roller by selectively adjusting the inclination of the unwinding roller,
The adjustment means,
It is a connecting arm that connects between the rotating plate and the unwinding roller, and after selecting the corresponding sheet roll for each winding process of the wrapping tape or the winding of the fireproof sheet, and then replacing the unwinding roller, adjusting the connecting direction of the connecting arm so that the oblique winding direction of the fireproof sheet and the oblique winding direction of the wrapping tape are wound in opposite directions to each other. delete delete delete delete

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