CN2063706U - Fireproof bridge frame for electric cable - Google Patents

Abstract

The utility model discloses a fireproof bridge frame for electric cables; the outer fire retardant and inner multilayer heat insulation structure is adopted, and wind drawing and rainproof components are arranged, so the fireproof function is more perfect and effects are excellent. A steel plate bends into a U-shaped steel construction in the bridge frame, the outer part is coated with fireproof paint, the inner part is coated by a mineral flax plate, and a heat insulation plate and a radial reducing plate are arranged. A louver plate and a rainproof cover are arranged at the upper part of a U-shaped steel construction. Bridge connection screw sleeves and X-shaped bridge connection lines are arranged between the adjacent elements of the bridge frame. When a fire disaster occurs and the bridge frame is in the fire, the temperature of the cable contact face positioned in the middle of the bridge frame can be maintained at 60 to 70DEG C because of the multilayer heat insulation and good wind drawing heat conduction.

Description

Fireproof bridge frame for electric cable

The utility model relates to a kind of cable fire-proof crane span structure, belongs to cable fire-proof resist technology field, is suitable for the usefulness of industrial and mining enterprises such as generating, distribution, oil, chemical industry.

The cable fire accident all once frequently took place in countries in the world, caused the tremendous economic loss.According to the incomplete statistics of the former Ministry of Water Resources and Power Industry of China, fire disaster accident 86 is just led to because of cable fire spreads in the whole nation from 1960～1985 years 16 years, causes plant downtime, power station generation outage, equipment one of to ruin torch.Abroad, cable fire also spreads all over places such as power station, electric substation, factory and enterprise, skyscraper, subway, tunnel, boats and ships.Therefore, the cable fire-proof problem already causes the concern of countries in the world and studies various fire prevention measures, to prevent the generation of cable fire.

Both at home and abroad the cable fire accident statistical analysis shows, belong to the reason of cable own the accident that accounts for total amount 1/4th, belong to external cause the accident that accounts for total amount about 3/4ths.

Ignition of cable of taking both at home and abroad or cable-flame retardant countermeasure have three classes substantially: (1) installs effective fire protection equipment, and (2) utilization prevents ignition of cable or stops cable to prolong the combustion means, the difficult combustion of (3) trial production, fire-resisting cable.

The utility model mainly is to solve when fire takes place, and with anti-flaming thermal-insulation cable is protected, and promptly avoids the cable fire accident that causes owing to outside burning things which may cause a fire disaster.

In the prior art, prevent ignition of cable or stop cable to prolong the means of combustion that adopts box structure has two series products substantially: the fire-resistant groove box of (1) closed groove box (2).

Closed groove box, it is to select for use fire-resistant or nonflammable material formation groove box, prevents from or alleviate outside fire the cable that sandwiches is wherein avoided destroying with realization.As the product of the manufacturing firm of Co., Ltd. of Furukawa Electronic and some like product of China, its structure broadly similar mainly constitutes box body by the spill upper and lower cover, is made up of heat-insulating cushion block etc. in box body annex (anchor clamps, sealing gasket, flame screen), the box body.Wherein box body adopts fiberglass reinforced plastics (hereinafter to be referred as FRP), though its sealing property is better, have stop cable self prolong the combustion effect, externally come the fire resistance property of burning things which may cause a fire disaster relatively poor.Because the sealing function of groove box causes heat dispersion poor, has reduced the ampacity (about 10%) of cable to a great extent.Though FRP tensile strength is higher in addition, bending resistance, antitorque characteristic are poor, and be obviously not good enough as the load-carrying member.Also have its heat-insulating cushion block to adopt microporous calcium silicate compound, have the lower shortcoming of protection capability of externally coming burning things which may cause a fire disaster too.

Fire-resistant groove box is a kind of groove box that bends with steel plate, the fire resistive construction product of heat insulation pad of interior pad such as calcium silicates, asbestos board, and states such as the Soviet Union, the U.S., Japan produce, and use in intensive mesolow Cable Group.Its major function is when fire takes place, and reduces the groove box back wall temperature that cable is housed.But when taking place, fire produces a large amount of heats, make in the groove temperature drop to cable and normally move permissible value, its thermal insulation layer will reach about 40%, as the outer temperature of compartmentalized box for holding assorted fruits and candies 850～1000 ℃ the time, temperature can be limited within 200 ℃ in the box, can keep 1～3 hour.Therefore, this groove box catches fire to the outside, and is bad to the protection effect of cable.If adopt the insulation blanket of thickening, will influence the cable filling rate.

Task of the present utility model provides a kind of cable fire-proof new construction of anti-flaming thermal-insulation effect, and it has multilayer insulation, reduction of heat, ventilation and heat, anti-wind and snow, anticorrosion and antistatic measure, also has the advantage that cost is low, manufacturing is easy for installation, use face is wider.

Its main technical points is: adopt outer fire-retardant interior heat insulation way, be bent into

The outside coated fireproof paint of shape steel bridge frame, Shape crane span structure inside clads with asbestic blanket, and thermal insulation board is set and subtracts radiant panel.At crane span structure Louver board and rain cover are stamped in the top of shape.Be provided with cross-over connection copper swivel nut and X type jumper between the crane span structure adjacent cells.

Below in conjunction with drawings and Examples the utility model is described in detail.

Fig. 1 is a structure chart of the present utility model.

Fig. 2 is for subtracting the view of radiant panel 3 among Fig. 1.

Fig. 3 is the view of rain cover 7 among Fig. 1, shutter 6.

Referring to figs. 1 through Fig. 3, crane span structure body 1 is bent into by the 2m/m thick cold rolled steel sheet

Shape, the A60-KG fireproof paint ammonia an aromatic plant metioned in ancient books intumescent coating that its outer wall coated 1m/m is thick.Insulation lining asbestic blanket plate 2, employing 8m/m is thick to be cladded in crane span structure body 1 inwall and the downside that subtracts radiant panel 3.Subtracting radiant panel 3 makes Shape, lid dress crane span structure body 1

The shape bottom is heat insulating panel 4 on it, and crane span structure lid 5 lids are put crane span structure body 1 top, and are fixing with snap close 8.Shutter 6 and rain cover 7 constitute the triangle strip and crane span structure lid 5 joins, cross-over connection swivel nut 9 places each unit, crane span structure body 1 outside (long 2000m/m of being, A, A ' determine according to customer requirements) first and last so that with the X-shaped jumper with adjacent unit connection.Except heat insulation, subtract the radiative material, all the other structural members all adopt metal material to make.

The characteristics of this cable fire-proof crane span structure are to have adopted the multilayer insulation method, reach that wall is thin, the optimum efficiency of anti-flaming thermal-insulation.For the advantage of this new construction clearly is described, the below effect of its each parts in fire prevention of summary.

When fireproof bridge frame is in the flame, be in outermost layer crane span structure body 1 and be subjected to three burnings, i.e. two sides and a bottom surface, rapid rising along with temperature, make the A60-KG fireproof paint of coated in crane span structure body 1 outside resolve into continuously evenly little close sponge shape thermal insulation layer, its thickness is tens of times of coating.Simultaneously because chemical reaction has stoped the burning of coating to be stretched.Because the heat-blocking action of coating makes the heating temperature of crane span structure body 1 be significantly less than flame temperature, forms bigger temperature gradient.Because crane span structure body 1 inboard is lined with the thick asbestic blanket plate 2 of 8m/m, therefore the heat of steel plate carries out the normal direction conduction in the back overwhelming majority of being obstructed rapidly along steel plate, a part is conducted heat to crane span structure lid 5 along crane span structure body 1 sidewall, this moment shutter 6 rain cover 7, produce draft effect, heat is discharged outside the crane span structure.During fire burns, the bottom of crane span structure is be heated maximum, the poorest position of heat sinking function, but owing to subtract the effect of radiant panel 3, make the heat that sees through the conduction of base plate asbestos layer, through subtracting radiant panel 3 reflected back asbestic blanket plate 2 again, the temperature of this moment has been low to moderate about 300 ℃, adds to subtract the provision for thermal insulation of using asbestic blanket plate 2 on the radiant panel 3 again, finally make the cable contact-making surface temperature maintenance that places innermost layer asbestic blanket plate 2 about 60 ℃～70 ℃, thereby guaranteed the normal operation of cable.

This crane span structure by domestic and international relevant test wire examination method, has carried out the simulation burning tests tens of times, has reached technical conditions.By analyzing relatively, under the situation that flame retardant cable is difficult to promote, this kind crane span structure all is better than other products at anti-flaming thermal-insulation, bearing capacity, erection construction at home, and after the enforcement, economic effect will be very remarkable.

Claims (5)

1, a kind of cable fire-proof crane span structure by steel groove box and interior pad heat-barrier material and be furnished with cable cleat and be sealed to form, is characterized in that its steel construction piece crane span structure body 1 is made strip by cold-rolled steel sheet, and its section is Shape, its outside coated fireproof paint, The shape medial surface subtracts radiant panel 3 also for the strip section is a ㄇ shape with 2 claddings of asbestic blanket plate, and lid is put on heat insulation asbestic blanket plate 2, and with multiple with heat insulating panel 4 lids that subtract radiant panel 3 plane sizes, That the upper cap of shape crane span structure body 1 is adorned is rainproof, cowling and crane span structure lid 5; Be furnished with connecting line between the adjacent cells, the first and last of each unit has a pair of cross-over connection swivel nut 9.

2, cable fire-proof crane span structure according to claim 1, the thickness that it is characterized in that crane span structure body 1 is 2m/m, the coating layer thickness of fireproof paint A60-KG in the outside is 1m/m.

3, cable fire-proof crane span structure according to claim 1 is characterized in that rainproof ventilation lid is a kind of shutter 6 of strip becomes subtriangular shape with section a rain cover 7.

4, cable fire-proof crane span structure according to claim 1, the thickness that it is characterized in that heat-barrier material asbestic blanket plate 2 is 8m/m.

5, cable fire-proof crane span structure according to claim 1 is characterized in that the connecting line between the unit is copper X-shaped jumper.

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