In the construction of cable bridge, the type of cable bridge and the selection of cable piercing clamp have become a headache for us. When many people encounter this type of selection, they are often in a dilemma. They do not know how to select the type, especially for the branch of cable bridge, what kind of cable piercing clamp to use. It is even more difficult. Next, Jinan cable bridge manufacturers will give you a detailed analysis of the selection of cable piercing clamp or cable bridge in different situations!
So how to choose the construction type of cable bridge and cable piercing clamp? Now let's take a look at how we should judge and choose when we meet similar situations. When encountering the choice of cable bridge type, the tray with cover and without hole is used to shield or prevent external pollution such as oil, liquid and combustible dust. The assembled tray and cable piercing clamp can be assembled on site, which is not limited by the construction site, and has the advantages of high product yield. It is especially suitable for the narrow construction site. Convenient transportation, greatly reducing the volume and transportation costs. However, due to the large number of assembly parts, it is necessary to do a good job of crossover and grounding after assembly.
In addition to the above, a perforated tray and a cable puncture clamp can be used. In the electric shafts of civil buildings, cable puncture clamps are usually used; in the ceiling of buildings, the domestic codes require the use of closed groove boxes. It is considered that combustible substances are not allowed in the ceiling, and that the volume ratio of combustible substances to the ceiling space should be treated differently. Due to the limited space occupied by cables, the corresponding international standards should be consulted. The international standard can adopt perforated tray and cable puncture clamp. In dusty environment or outdoor places where shade is needed, pallets with cover plates should be used. Public passageway or outdoor crossing road section, the bottom of the lower ladder should be protected by plate or pallet.
When the cable puncture clamp is required to be fireproof, one of the following measures may be taken in accordance with the relevant design specifications:
1) Using fire-resistant cable groove box or fire-retardant cable puncture clamp, the implementation of the standard "1GB294152013" fire-resistant cable groove box.
2) Use common steel covered pallet with closed fire-resistant or flame-retardant heat insulation board inside, and coat the outer surface with fire-retardant expansion paint not less than 0.5mm thick. Personally, I think that neither of these methods can meet the requirements in practice. If the insulating plate is used, the heat dissipation of the cable will be disadvantageous in normal operation; if the fire-proof coating is applied on the surface of the steel cable bridge, the coating and the bridge frame do not constitute anchorage structure, and the adhesion is poor. When the flame temperature reaches above 450 C, the galvanized layer melts and the galvanized layer together with the fire-proof coating will fall off as a whole. Therefore, fire-resistant cables should be used in places where fire resistance of cables is really needed.
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