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Glass steel bridge
Building components made of fiberglass reinforced plastics and flame retardants
This entry is approved by the project of "Science Popularization China" science encyclopedia entry compilation and application.
The FRP bridge is composed of glass fiber reinforced plastics, flame retardants and other materials, and is pressed by composite molding material and stainless steel shielding net.
Introduction to the
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Due to the selection of materials with low thermal conductivity and the addition of flame retardants, the product not only has fire insulation, self-extinguishing, and has high corrosion resistance, but also has the advantages of light structure, aging resistance, safety and reliability, can be easily used with metal bridge, in chemical industry, metallurgy, petroleum and other strong corrosion environment is used. [1]
use
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Glass fiber reinforced plastic bridge is suitable for laying power cables with voltage below *0 kV, as well as indoor and outdoor overhead cable trenches and tunnels such as control cables, lighting wiring, pneumatic and hydraulic cables.
FRP bridge has the characteristics of wide application, high strength, light weight, reasonable structure, low cost, long life, strong anti-corrosion, simple construction, flexible wiring, installation standard, beautiful appearance, which brings convenience to your technical transformation, cable expansion, maintenance and overhaul. The installation of FRP bridge can be adapted to local conditions. [1]
classification
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Can be laid overhead with the process pipeline; Floor and beam lifting; Side installation on indoor and outdoor walls, column walls, tunnels, cable trench walls, can also be installed on the open column or support pier. When hoisting large multi-storey bridge, I-beam columns should be laid symmetrically on both sides as far as possible. BHQ series FRP bridge can be laid horizontally and vertically, can be corner, T shaped, cross branch; Adjustable width, height and diameter.
Cable tray is a cable laying device that enables the laying of wires, cables and tubes to achieve standardization, serialization and generalization.
Basic types:
1. Trough cable bridge
The utility model relates to a fully enclosed cable bridge, which is most suitable for laying computer cables, communication cables, thermocouple cables and other control cables of highly sensitive systems. Shielding interference and protection of cables in heavy corrosion environment have good effects.
2. Tray type cable bridge
It has the advantages of light weight, large load, beautiful shape, simple structure, convenient installation, etc. It is suitable for the installation of power cable, but also suitable for the laying of control cable.
3. Cascade cable bridge
Suitable for laying large diameter cables in general, especially for laying high and low power cables.
FRP, aluminum alloy and long span cable bridge. There are cable trough, line screen, trough bending, tee, tee and straight, as well as bracket, hanger.
4. Epoxy composite cable bridge
The traditional metal bridge surface anticorrosion layer thickness is small, easy to damage in the process of transportation and installation, and the surface has small holes, corrosive gas is easy to enter the structural layer through the holes to affect the anticorrosion effect; Non-metallic cable bridge has strong anti-corrosion performance, but the mechanical strength is not enough. Based on these conditions, our company developed an epoxy composite cable bridge: it adds a metal skeleton in the epoxy cable bridge, which not only retains the characteristics of the original epoxy cable bridge, but also increases the mechanical strength, can bear large-diameter cables, and the span of the bridge can reach *2 meters. In order to solve the delamination problem caused by different expansion coefficient between metal and non-metal, a binding layer is added between metal and non-metal. In order to solve the problem of easy powder, easy aging, the surface of the bridge moulded with anti-light and other special protective layer; The service life of epoxy resin composite cable bridge has been identified by relevant institutions to be more than *0 years. This product has been used for *5 years without fading and aging signs. Epoxy composite cable tray is most suitable for corrosive environment, large span, heavy load conditions.
Protective cover plates should be selected for cable Bridges in areas vulnerable to external mechanical damage and open air. Cable trough or ladder in the branch, can adopt a variety of bending connection.
According to different surface treatment, it is divided into:
Hot-dip galvanized bridge, hot-dip galvanized plate bridge, electrothermal galvanized bridge, electrostatic spray plastic bridge, fire-proof paint (paint) bridge, anti-rust paint bridge, fire-retardant bridge, etc.
Bridge has developed rapidly in recent years. It has not only been serialized, but also developed from ordinary bridge to fire-resistant bridge, anti-corrosion bridge and other varieties, which can fully meet the needs of the project. [1]
Precautions
I. General Provisions
1. In order to meet the installation requirements of cable bridge in engineering design, the provisional provisions are formulated. After the national standards have the specific requirements for the installation of cable bridge, the national regulations shall prevail.
2. Cable tray is used for laying power cables, control cables, communication cables and self-controlled tubes in industrial and mining enterprises and civil buildings.
2. Installation of cable bridge
1. The general layout of the cable bridge should be the shortest distance, economical and reasonable, safe operation, and should meet the requirements of construction, installation, maintenance and cable laying.
2. The cable bridge should have enough stiffness and strength to provide reliable support for the cable.
3. After the cable is laid, the deflection of the cable bridge should not be greater than 1/**0 of the span of the cable bridge. When the span of the cable bridge is greater than or equal to ***0mm, the deflection should not be greater than 1/**0 of the span of the cable bridge.
4. Cable bridge should be installed on structures (such as walls, columns, beams, floors, etc.) as far as possible, and closely cooperate with civil engineering professionals.
5. When the cable bridge is installed with the process pipe frame, the cable bridge should be arranged on one side of the pipe frame.
