KR20170032744A - A Fire Protection Cover of Electric Contact and Constructing Method Using Waved Profile of High Temperature Maintained Shape - Google Patents

Abstract

The present invention relates to a pipe and a cable tube having a tempered corrugated cross-sectional structure for fire protection of a facility. According to the present invention, cables and connection points of cable are surrounded by a cable tube made of thermos-expandable resin, the cable tube has a corrugated cross-sectional structure to maximize a cross-sectional are exposed to flames, and the cables and the connection points are thereby protected by foaming of the cable tube having the corrugated cross-sectional structure in case of fire, and since free ventilation is provided in normal time, a problem of spontaneous combustion etc. in the cables and the connection points can be overcome. To this end, the pipe and the cable tube are installed to surround the outer surface of the cables or the connection points, are made of a thermos-expandable resin material having properties of being foamed and maintaining the shape without collapsing by high temperature heat in case of fire, and have the corrugated cross-sectional structure along a circumferential direction, so as to be polyhedrally expanded in case of fire. Thus, the material is structurally prevented from scattering from an airflow by the fire, so a flame-retardant and thermal isolation structure can be maintained for a long time.

Description

BACKGROUND OF THE INVENTION Field of the Invention [0001] The present invention relates to a fire protection piping and a cable tube,

FIELD OF THE INVENTION The present invention relates to a fire protection pipe and a cable tube for safely protecting a pipe and a cable installed in a tunnel or the like from fire. More particularly, the present invention relates to a fire protection pipe and a cable tube which surround a connection point of a cable and a cable with a cable tube made of a thermally- It has a cross-sectional structure to maximize the cross-sectional area exposed to the flame, thereby protecting the cable lines and connection points by foaming the cable tube of the cross-sectional structure in case of fire, and overcoming the problem of natural heating of cable lines and junctions Which has a high-temperature corrugated cross-sectional structure.

In the case of such a power facility, a high-voltage electric wire is exposed to the outside in order to transfer a high-voltage electric current, and a high-voltage electric wire exposed to the outside is supplied to the outside Short-circuiting and short-circuiting are liable to be caused by interference, and there is a problem that the surrounding landscape is damaged due to the erroneously installed high voltage cable.

Nowadays, there is a tendency to gradually install high-voltage lines on the ground using electric power facilities, cofferdams, manholes, and trays underground. In addition to transmission facilities, many electric wires are installed in wiring such as a luminaire installed in a tunnel of a road.

In the case of a cable, a connecting portion is formed at a predetermined length (about 300 meters) to connect the high-voltage line so as to facilitate connection and at the same time to facilitate operation and maintenance.

At this time, since the diameter of the cable is considerably large, the connecting portions are coupled to each other in a state in which they are in contact with each other, and an insulating tape is wrapped around the joined portion to protect the connecting portion.

Most of the electric fire accidents are caused by the heat in the connection part, the damaged part of the cable and the terminal part of the cable, and fire accompanied by the arc and heat is generated. The electric power source, the common hole, the manhole, , A healthy cable that does not cause an accident nearby is also exposed to a flame, resulting in a secondary power accident. In the case of flooded areas or other areas where earth insulation is weak, an accident current may be transmitted, which may damage other facilities and cause electric shock to nearby people.

Due to these problems, studies have been actively conducted on the way to promptly notify the operator of a fire and suppress the fire.

Patent Document 10-2014-0103868 (2014.08.27) Patent Document 10-2014-0007816 (2014.01.20.) Patent No. 10-0812748 (Mar.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and it is an object of the present invention to provide a foam material having a corrugated cross-sectional structure, A pipe having a high-temperature corrugated cross-sectional structure capable of securing multi-directional ventilation in longitudinal direction, transverse direction, upward direction and downward, and a pipe for fire protection and a cable tube The purpose is to provide.

In addition, the existing cable tubes are in surface contact with the cable lines or connection points to be protected. However, the present invention is characterized in that the fire protection pipes and the cable tubes having the high-temperature wave- Another object of the present invention is to provide a fire protection piping and a cable tube having a high-temperature corrugated cross-sectional structure having excellent characteristics of heat release.

In order to accomplish the above object, the present invention provides a piping and cable tube for fire protection, which has a high-temperature corrugated cross-sectional structure, and is installed to surround an outer surface of a cable line or a cable connection point, It is made of thermally expandable resin material which is kept without collapsing. It has a corrugated cross-sectional structure along the circumferential direction. When it is in a fire, it expands and structurally blocks the scattering of material from the air stream caused by fire. .

INDUSTRIAL APPLICABILITY The present invention has the following effects as piping and cable tubes for protecting a cable line and connection points weak against heat from fire.

① Teflon and heat shielding properties superior to flat structure

In order to protect the facility from the fire source and heat by the use of the heat-expandable material, the cross-sectional area exposed to the fire is increased by the three sides of the upper, lower, and left sides than the plane, It is possible to acquire a dramatic increase in the thickness of the thermally expanding structure due to the expansion in four directions than the unilateral expansion of the material in the one direction, have.

② Effect of ensuring ventilation through the cross-sectional structure

Basically, the corrugated cross-sectional structure that has the structure of the orthogonal frequency type secures the longitudinal ventilation according to the installation angle.

In addition, holes can be formed in the cross section of the corrugated protrusions at regular intervals, thereby ensuring air permeability in the longitudinal, lateral, upward, and downward directions, thereby preventing heat release and moisture deposition in the ordinary facility .

③ Effect of securing elasticity through wave form cross-sectional structure

Basically, the corrugated cross-sectional structure having the structure of the orthopedic frequency type has a structure that can be easily adjusted in accordance with the shape and size of the facility because it has a structural space that can be constantly increased or decreased in the horizontal direction.

④ Reinforcing effect of horizontal load strength through wave cross-sectional structure

Basically, the wave cross-sectional structure, which has the structure of the orthogonal frequency type, is mechanically stronger than the twisted and deflected structure. The flat structure product is a structure that simply encloses the shape of the product, which has a disadvantage in that the area of contact with the product increases and the heat transfer increases in case of fire. However, the piping and cable tube of the corrugated cross-sectional structure of the present invention are stable from sagging or twisting over a planar structure and can maintain proper spacing from the object to be protected.

Even if it is in close contact with the facility, the entire plane like the planar structure is not closely attached to the facility but is linearly adhered at regular intervals and the rest is floating in the air, so that the air insulation layer can be formed first in case of fire, can do.

In addition, the flat structure has a disadvantage in that it is warped at a certain size even if the hardness is increased. On the other hand, when the strength of the corrugated cross-sectional structure is constantly controlled, A reinforcing structure can be formed.

1 is a perspective view showing a fire protection pipe and a cable tube installed on a cable line according to an embodiment of the present invention.
Fig. 2 is an enlarged perspective view showing a structure in which the piping and the cable tube of Fig. 1 are installed on a cable line. Fig.
Figure 3 is a perspective view of the piping and cable tube of Figure 1;
Fig. 4 is a schematic view of a test apparatus constitution and a heating apparatus for confirming the heat-shielding performance of the conventional piping and cable tube and the piping and cable tube of the present invention.
5 is a time-dependent temperature distribution of the upper thermocouple of the flammable plastic.
6 is a time-dependent temperature distribution of the lower thermocouple of the flammable plastic.
Fig. 7 is a photograph showing a pipe and a cable tube of a conventional flat plate structure, and a shape after a heating test of a piping and a cable tube of a corrugated sectional structure of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of a fire protection pipe and a cable tube having a high-temperature corrugated cross-sectional structure according to the present invention will be described in detail with reference to the accompanying drawings.

Referring to FIGS. 1 to 7, the piping and cable tube 10 of the present invention is formed in a tubular shape having open ends at both ends, and is installed so as to surround an outer surface of a cable line or a cable connection point. The pipe and the cable tube 10 are made of a thermally expandable resin which is foamed by heat at a high temperature in the event of a fire and maintains the foamed form as it is. The shape before foaming is a cross-sectional structure of a corrugated shape along the circumferential direction, And the vent holes 11 are arranged in a lattice structure. The piping and cable tube of the present invention having a corrugated cross-sectional structure is installed so as to surround the outside of facilities such as pipes and protects the facilities from fire. The vent holes 11 may be formed in a long and long shape.

The cross-sectional structure of the piping and cable tube 10 of the present invention basically has a sinusoidal (sinusoidal) frequency shape, and thus secures ventilation in the horizontal direction according to the facility and installation angle. The pipe and cable tube (10) of the present invention has a plurality of ventilation holes (11) to ensure air permeability. In addition, since it can be bent or stretched in various forms according to the shape and size of the cable line and the cable connection structure, it is possible to provide free construction.

In the piping and cable tube 10 of the present invention, the corrugated cross-sectional structures are overlapped with each other. At this time, the mutually overlapping portions of the pipe and the cable tube 10 can be joined and separated by a fastener such as a button, .

The piping and cable tube 10 of the present invention is made of a thermally expansible resin that is foamed by heat at the time of fire and is retained without collapsing after foaming. The thermally expansive resin is prepared by mixing a carboxymethyl caramel or a sugar silica caramel with expanded graphite or vermiculite or ferrite, an isocyanate, and a polyol. The thermally expansible resin may be prepared by mixing an expanded graphite, a dispersant, an isocyanate, and a polyol in a one-pack type mixture with an expanded graphite, an isocyanate-containing liquid A, a polyol, an expandable graphite, It may be prepared as a two-part type in which B liquid containing caramel phosphate or sugar silica caramel is reacted at a certain ratio.

The above-mentioned sugar carnaic acid caramel and sugar silica caramel have excellent toughness, so that the thermal expansion resin is expanded by expanding graphite to prevent the collapse of the foamed graphite, thereby preventing the scattering of the expanded graphite and suppressing the combustion, thereby realizing excellent flame retardance and heat resistance .

When a thermally expandable adhesive is manufactured by applying caramelized sugar, a sugar carbohydrate is produced by mixing sucrose and phosphoric acid and then decomposed with sugar. The polyol for urethane and the expanded graphite (Expandable Graphite) and a dispersant are mixed and stirred, and is prepared by mixing isocyanate with a mixture of caramelized sugar caramel and expandable graphite.

When mixing the caramelized sugar caramel and expanded graphite, sodium octaborate tetrahydrate in solid form may be mixed with meta-silicate on the colloid to further add the resulting sodium octaborate solution. In forming the sodium octaborate solution, 10 to 40 parts by weight of a colloidal-type meta-silicate is preferably mixed with 100 parts by weight of sodium octaborate. When the sodium octaborate solution is mixed with caramelized sugar, 10 to 50 parts by weight of sodium silicate solution is preferably mixed with 100 parts by weight of caramelized sugar caramel.

When the isocyanate is mixed with the mixture of the caramelized phosphate caramel and expanded graphite, it is preferable to add at least one of petroleum or vaseline to maintain the viscosity of the thermally expandable adhesive.

On the other hand, when a thermally expandable resin is produced by using a sugar silica caramel, a sugar silica caramel is prepared by adding and dissolving sugar to colloidal silica, and then a polyol for urethane, an expandable graphite and a dispersant are added to the sugar silica caramel Mixed and stirred, and mixed with a mixture of sugar silica caramel and expanded graphite to prepare an isocyanate.

At this time, the sugar silica caramel is prepared by dissolving 50 to 80 parts by weight of sugar relative to 100 parts by weight of colloidal silica. When mixing the sugar silica caramel with expanded graphite, sodium octaborate tetrahydrate in solid form may be added to the colloidal meta-silicate to further add the resulting sodium octaborate solution. Further, when the isocyanate is mixed with the mixture of the carboxymethyl cellulose caramel and the expanded graphite, one or more of petroleum or petroleum jelly may be further added to maintain the viscosity of the thermally expandable adhesive.

The pipe and cable tube 10 having the corrugated cross-sectional holding structure of the present invention has an increased cross-section to prevent fire due to the corrugated cross-sectional structure than the existing flat-panel firepipe tube product (refer to FIG. 7).

In contrast, the pipe and cable tube of the corrugated cross-sectional structure of the present invention can be uniformly expanded evenly on both sides of the corrugated cross-sectional structure formed by the heat transfer through the vertical vent hole (11) So that the thickness of the row can be increased.

The corrugated cross-sectional structure forms a thermally insulated barrier so that the thermally expanded elements are not scattered from the heat stream, so that the thermally expanded material is located between the corrugations of the corrugated structure and not scattered.

The piping and the cable tube having the corrugated sectional structure of the present invention have the following characteristics.

① Securing performance of secondary shielding and heat shielding through the cross-sectional structure

First, the existing planar structure has the characteristic that the mechanical strength that it possesses becomes weak when the volume is swollen by thermal foaming in case of fire. If the strength of the foamed shape is weak, the air flow due to the flame will cause the secondary air layer to scatter and collapse, which will deteriorate the fire-stopping property and deteriorate fire durability for a long period of time.

In order to overcome this problem, the thermally foamed material is confined in the corrugated cross-section structure during the fire to structurally block the scattering from the airflow caused by the fire, so that the long-time discarding and heat shielding structure is maintained.

The second corrugated cross-sectional structure has a larger surface area exposed to the flame than the flat plate structure, and there are many spaces that are spaced apart from each other to ensure air permeability and facility in the normal state.

As a result, the heat generated from the fire is foamed on both sides of the high-temperature-wave-shape retaining structure to fill the void caused by the bending of the corrugated cross-sectional structure as described in the first paragraph. As a result, the secondary effect can be thermally expanded It is possible to dramatically increase the secondary salt and heat effect compared to the heat foaming materials of the flat plate structure.

② Ensure ventilation through the cross sectional structure

The first corrugated cross-sectional structure is a structure that forms a wave like a frequency, so that the area attached to the facility in the facility is much smaller than that of the flat-plate structure of the flat plate structure. So that the air permeability can be secured.

Second, the transverse ventilation can be ensured through the corrugated cross-sectional structure. However, in order to supplement the longitudinal ventilation, the corrugated cross-sectional structure and the lattice- , The bottom, left, and right sides can maximize ventilation at all times.

③ Securing elasticity through waveform cross-sectional structure

The first corrugated cross-sectional structure is a structure in which the basic shape is a shape in which the surfaces are folded at regular intervals and has a structural property of increasing or decreasing in the waveform direction if mechanical strength is maintained.

As a result, it is possible to cover the facilities with the same standardized waveform cross-sectional structure products with a certain scale or more by flexibly responding to various facilities.

④ Reinforcement of horizontal load strength through corrugated cross-sectional structure

Firstly, the product of flat plate structure is sagged by gravity and is disadvantageous to form a proper distance from the facility due to the nature of flat plate structure.

However, the corrugated cross-sectional structure is structurally more resistant to warp than the flat structure due to the nature of the structure, so that the shape can be kept long without a separate support for a longer distance than the flat structure and can be uniformly spaced.

Conventional piping and cable tubes are characterized by a flat structure as a flame retardant fabric coated with a thermally expandable flame retardant material on the fabric, and the shape and shape of the facility are projected through surface contact with the facility while surrounding the facility. In the case of the flame retardant fabric having such a conventional plane structure, air permeability is ensured through the holes opened in the planar direction, so it is difficult to ensure air permeability in the section where the surface is in contact.

For this reason, a large amount of thermal expansion material can not be applied because it causes a hole clogging even if a large amount of thermal expansion material is applied to increase the heat shielding and heat shielding performance. When the thermally expandable material is excessively applied in a planar structure, it is difficult to ensure air permeability, and when the thermally expandable material is applied in a small amount to secure ventilation, the fire safety performance is deteriorated.

On the other hand, the piping and cable tube of the corrugated cross-sectional structure of the present invention has three more structures than the planar structure, maximizing the cross-sectional area contacted from the fire when a fire occurs, and in line contact with the object to be protected, The upper, lower, left, and right sides can secure a space for thermal expansion, and thus, it is possible to secure much more heat and wall thickness. In addition, there is no structure to support the thermal expansion elements on the left side in the case of fire, so that it is difficult to maintain the heat-shielding and demistering performance for a long period of time due to scattering due to the heat flow due to fire, while the corrugated cross- Since the thermally expanded elements are securely held in the corrugated cross-sectional structure, the foamed material can be protected from the heat flow caused by the fire.

In addition, while the conventional plan structure has no planar cross sectional area change, the right corrugated cross-sectional structure can secure a stretchability of about twice the unit area because the structure itself is formed into a corrugated cross-sectional structure firmly during the molding process.

Fig. 4 is a schematic view of a test structure and a heating device for confirming the differential performance between the corrugated cross-sectional structure and the flat plate structure. The left side of the drawing shows a general flat plate type structure using a foamed material and the right side shows a corrugated sectional structure using a foamed material. Below the foamed material there is a flammable wire coating and the temperature of the top and bottom of the wire coating was measured. The cone calorimeter tester specified by KS F 5660-1 is used for heating, the heating intensity is 50 kW / M ^2, and the temperature of the heating heater is about 800 ° C. The thermal performance of plate and corrugated cross section structures was verified using the same heating conditions.

5 is a time-dependent temperature distribution of the upper thermocouple of the flammable plastic. The X axis is time (seconds) and the Y axis is temperature (° C). In the case of the waveform (wave type) structure, 120 ° C was measured, and a difference of 140 ° C occurred at the same time. The same material was used to check the heat effect at 140 ° C, .

6 is a time-dependent temperature distribution of the lower thermocouple of the flammable plastic. The X axis is time (seconds) and the Y axis is temperature (° C). At the elapse of about 300 seconds, the plate type was measured at 85 ° C, and in the case of the wave type structure, the temperature at 65 ° C was measured and a difference of 20 ° C was observed at the same time. .

FIG. 7 shows the shape after the heating test of the plate and corrugated cross-sectional structure. In the case of corrugated cross-sectional structure, the height of the foam is higher than that of the equilibrium structure, and the coating located below the corrugated plate has a good shape .

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the present invention as defined by the appended claims. And it is to be understood that such modified embodiments belong to the scope of protection of the present invention defined by the appended claims.

10: Piping and Cable Tube  11: Ventilation holes

Claims (9)

A thermally expandable resin material which surrounds an outer surface of a cable line or a cable connection point and has a property of being foamed by heat at a high temperature in the event of a fire and being maintained without being collapsed and having a corrugated cross- Wherein the fire shielding structure is structurally blocked from the airflow caused by the fire, so that the shielding structure and the heat shielding structure are maintained for a long time. The pipe and cable tube for fire protection according to claim 1, wherein the pipe has a high-temperature corrugated cross-sectional structure that can be freely and flexibly installed according to the size and shape of the cable line and the cable connection point. [2] The method of claim 1, wherein the corrugated cross-sectional structure has a shape corresponding to the frequency waveform so that the area attached to the cable line and the cable connection point when installed at the cable line and the cable connection point is smaller than the flat- Wherein the frame is spaced apart from the cable line and the cable connection point at a predetermined interval to ensure air permeability through the pipe, the fire pipe and the cable tube having a high-temperature corrugated cross-sectional structure. [3] The method according to claim 1, wherein, in order to compensate for securing the air permeability in the longitudinal direction, a ventilation hole (11) is formed at a predetermined interval in a corrugated cross- , And a duct having a high-temperature corrugated cross-sectional structure, characterized in that the ventilation is maximized at normal times. The apparatus according to claim 1, wherein the thermally expandable resin material is a mixture of caramelized sugar caramel or sugar silica caramel, expanded graphite, vermiculite or ferrite, isocyanate, and polyol. Protective tubing and cable tubes. 2. The facility according to claim 1, wherein the structure of the corrugated cross-sectional structure is selected from a sinusoidal waveform, a sinusoidal waveform, a rectangular waveform, a triangular waveform, a square waveform, Cable Tube. The pipe and cable tube for fire protection according to claim 1, wherein the piping protects the piping for construction and the piping for electricity, so that the piping has excellent workability. [2] The fire extinguishing piping and cable tube according to claim 1, wherein the piping and the cable tube have a corrugated cross-sectional structure. 9. The facility according to claim 8, wherein the mutually overlapping portions of the pipe and the cable tube are capable of being coupled and separated by a fastening device such as a button, clip, tacker, etc. [ .

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