The fireproof bridge is suitable for laying power cables below 10KV, as well as indoor and outdoor overhead cable trenches and tunnels such as control cables and lighting wiring.

Fireproof bridge is to spray a layer of fireproof paint on the surface of ordinary bridge to play the role of fire retardant! In fact, the bridge itself does not catch fire. It is only the cables that can catch fire, and the fire retardant principle of fire retardant paint. Cables with different voltages and different uses should not be laid on the same layer of bridges. When restricted by conditions, the cables should be installed on the same layer of bridges. When the length of the straight-line steel cable bridge exceeds 30m and the aluminum alloy cable bridge exceeds 15m, there is a telescopic joint; when the cable bridge passes through the building expansion (settlement) joints, compensation installation should be left. The bending radius at the turning point of the cable bridge should not be less than the maximum value of the minimum allowable bending radius of the cable in the bridge. The minimum allowable bending radius of various cables should not be less than the standard rules. The specifications of various bends and accessories should meet the engineering layout conditions and be matched with the bridge. The filling rate of cables in pallets and ladder frames should not exceed the value of the relevant national regulations. Cables can be laid on the cable tray without spacing. The ratio of the total cross-sectional area of ​​the cable to the cross-sectional area in the tray, the power cable should not be greater than 40%, the control cable should not be greater than 50%, and 10% to 25% of the project development margin should be reserved.

The protective thickness of the fireproof bridge is according to Table 10 of JB / T 10216-2000 "Cable Bridge for Electrical Control and Distribution", electroplating is greater than 12μm, hot plating is greater than 65μm, spraying is greater than 50μm, and fire protection is greater than 500μm, which can be measured with a thickness gauge .

The hot-dip galvanized coating of the fireproof bridge is thicker, so the corrosion resistance is stronger. The cold-dip galvanized layer is brighter than the hot-dip galvanized layer, but it is thinner and can resist corrosion. It is mainly composed of glass fiber reinforced material and inorganic binder composite fire board and metal skeleton composite and other fire base materials. The outer layer is added with fireproof coating, the fireproof bridge will not be extinguished when it encounters fire, so it can block the spread of fire, has extremely good fire resistance and fire resistance, and has fire resistance, oil resistance, corrosion resistance, non-toxicity and pollution-free. , Long service life and beautiful appearance, the cable device is in the cable bridge, the environment is neat and clean, it is easy to clean. Fire retardant coating has the characteristics of thin coating, high fire resistance and strong adhesion.

Fire-resistant bridge frame, with a frosted appearance, is generally used in various distribution lines of fire protection equipment, including fire control rooms, fire pumps, fire elevators, smoke exhaust fans and automatic fire alarm systems. Other distribution lines besides automatic fire alarm systems Fire-resistant cables can be used without the use of fire-resistant bridges. The fire-resistant bridge in the open garage requires fire resistance time greater than 1h. For the section requesting fire protection of the bridge frame, fire-resistant or incombustible plates and net materials can be added to the pallets and ladder frames to form a blocked or semi-blocked structure.

In daily life, fire-resistant bridges are not very common. Is the expansion and contraction problem of fire-resistant bridges unusual? Let the editor inform you about the expansion and contraction of fire-resistant bridges.

Due to changes in the ambient temperature, the steel cable bridge will exhibit thermal expansion and contraction.