Steel cable trays are straight through, especially on three row trays. If steel cable tray connection boxes are not used, two ****** bends need to be made to transition the three row parallel trays at any intersection point. Calculated based on one intersection point per meter in the project, more than a thousand can be reduced.

Due to the shared use of lifting arms and cross arms in three rows of steel cable trays, two-thirds of the lifting arms and cross arms can be reduced compared to laying them separately. Although the shared lifting arms and cross arms require additional load-bearing models, nearly half of the auxiliary material costs can still be saved. Multiple rows of steel cable trays are installed in parallel, reducing the on-site production time of iron components. The construction speed is fast and efficient, which can effectively save labor time, improve labor efficiency, and reduce labor consumption. It has been calculated that compared with the installation of single row steel cable trays separately, it can save more than 20%.

Steel fireproof bridge frame (flame-retardant bridge frame)

Flame retardant steel fire-resistant cable trays are suitable for laying indoor and outdoor overhead cable trenches and tunnels for power cables below 10KV, as well as control cables, lighting wiring, etc.

Characteristics of flame retardant steel fireproof bridge frame

The flame-retardant steel fire-resistant bridge is mainly composed of fire-resistant board composite with glass fiber reinforced material and inorganic adhesive, metal skeleton composite, and other fire-resistant substrates. The outer layer is coated with fire-resistant paint, and the flame-retardant steel fire-resistant bridge will not burn when exposed to fire, thus blocking the spread of fire. It has extremely good fire-resistant and fire-resistant effects, as well as being fire-resistant, oil resistant, corrosion-resistant, non-toxic, and pollution-free. The overall installation is convenient, the structure is reasonable, the service life is long, and it is beautiful. The cable is installed in the cable bridge, and the environment is clean and easy to clean. Fireproof coatings have the characteristics of thin coating, high fire resistance limit, and strong adhesion.

Process materials, structure, and performance of flame-retardant steel fire-resistant bridge frames

The steel skeleton is mainly made of high-quality cold-rolled plates through mechanical processing, with the characteristics of high load-bearing capacity and long service life. The cross-section of the steel skeleton is neat without burrs or sharp corners, and the groove is smooth and flat without sharp protrusions.

① After processing and forming, the cross-sectional shape is uniform, without defects such as bending, twisting, cracks, edges, etc.

② The fireproof board is mainly made of siliceous and calcareous materials, mixed with a certain proportion of fiber materials, lightweight aggregates, adhesives, and chemical additives, and made by advanced steam pressing technology.

③ Fireproof coating is an effective product for protecting steel structures. It is made by selecting polymer synthetic resin as the film-forming material, adding flame retardants, foaming agents, carbonization agents, and high-temperature refractory materials. Under high temperature conditions, the coating undergoes continuous foaming expansion effect, forming a flexible sponge like carbonized insulation layer, which prevents the steel structure it carries from rapidly softening and deforming due to the action of high temperature flames, and the strength will not sharply decrease. The fireproof coating layer on the exterior should be sprayed evenly, smoothly, and without obvious color difference.

④ Refer to the steel trough bridge series for structural graphics, with fireproof board or fireproof coating added to the inner layer, and ensuring reliable fixation between the fireproof board and the bridge.

Main parameters of flame-retardant steel fireproof bridge frame

① Fireproof coating:

Appearance: White, uniformly thick fluid, no lumps;

Surface drying time: 2 hours;

Adhesive strength: 0.78Mpa;

Seismic resistance: The flexural L/200 coating does not delaminate or peel off;

Bending resistance: The L/100 coating does not peel or detach when bent;

Fire resistance: the coating has no change when immersed in tap water for more than 24 hours in foam;

Acid resistance: immerse foam in 3% HCL for more than 24 hours, and the coating has no change;

Alkali resistance: when immersed in foam for more than 24 hours in 3% Ca (OH) 2, the coating will not change;

Salt resistance: after immersion in 3% NaCl with foam for more than 24 hours, the coating will not change;

Freeze resistance: 15 times;

The thickness of coatings with different fire resistance limits is as follows:

Fire resistance limit h 0.5 1 1.5 2 2.5

Coating thickness mm 0.4-0.6 0.8-1.0 1.4-1.6 1.8-2.0 2.4-2.6