Hottest Jiaozuo hot dip galvanizing cable tray fac

2022-09-28
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Jiaozuo hot-dip galvanizing cable bridge factory_ Jiaozuo hot dip galvanized cable tray manufacturer_ Jiangdong Bridge Factory

source network release time: 02:44:02

the company's main products -- Tianjin ladder bridge, Tianjin long-span fireproof trough cable bridge, Tianjin long-span fireproof trough cable bridge, Tianjin step cable bridge, Tianjin stainless steel bridge, Tianjin step bridge, Tianjin trough bridge, Tianjin long-span bridge, Tianjin FRP trough cable bridge, Tianjin galvanized cable bridge, Tianjin stainless steel cable bridge has a variety of machines for you to choose from! Frame, Tianjin fireproof cable tray, Tianjin galvanized trough cable tray, Tianjin trough cable tray, Tianjin sprayed cable tray, Tianjin hot-dip galvanized cable tray, Tianjin bridge, Tianjin fireproof trough cable tray, Tianjin fiberglass cable tray, Tianjin combined cable tray, Tianjin spray plastic cable tray, Tianjin trapezoidal cable tray, Tianjin long-span cable tray, Tianjin galvanized trough cable tray, Tianjin hot-dip galvanized cable tray, Tianjin aluminum alloy cable tray, Tianjin aluminum cable tray, Tianjin fire-proof cable tray, Tianjin spray plastic cable tray, Tianjin fire-resistant cable tray, Tianjin tray type cable tray, Tianjin FRP cable tray, Tianjin combined cable tray, Tianjin tray type cable tray, Tianjin fire-proof trough type cable tray, Tianjin aluminum alloy trough type cable tray, Tianjin ladder type cable tray, Tianjin aluminum cable tray, Tianjin long-span galvanized trough type cable tray, Tianjin FRP trough type cable tray, Tianjin galvanized cable tray, Tianjin stainless steel trough bridge, Tianjin trapezoidal cable bridge, Tianjin cable bridge, Tianjin spray bridge, Tianjin fire-resistant bridge, Tianjin aluminum alloy cable bridge, Tianjin stainless steel trough cable bridge, Tianjin large span galvanized trough cable bridge, Tianjin aluminum alloy trough cable bridge

the cable tray should be reliably fixed. If the tray is used as the grounding main line, the end of each layer of tray should be connected (in parallel) with 16mm2 soft copper wire, which should be connected with the main grounding main line to avoid connection. Long distance cable trays should be grounded every 30-50 meters. When laying horizontally, the connectors between bridges should be set at about 1/4 of the span as far as possible. The horizontal cables should be fixed every 2 meters or so, and the vertical cables should be fixed every 1.5 meters or so

the large load support spacing of cable tray shall be less than the allowable load and support span. In addition to the shielding protective cover for the cable tray device, the protective cover should be installed on the top of the high-temperature fan when it is installed outdoors to prevent the great demand for modified plastics from being exposed to the sun and rain. If it is necessary to weld and install, the thickness of the weld around the weldment should not be less than the thickness of the base metal, and the weld junction must be treated for corrosion prevention. When selecting the width of cable tray, a certain spare space should be reserved for adding cables in the future

we all know that cable tray has certain seismic reliability. How to analyze this performance? Let's see the analysis and explanation of seismic reliability of cable tray

the bending stress of cable tray under artificial seismic load is much larger than that of other types, so the main failure mode is that the bending stress exceeds the stress limit specified in the evaluation criteria. The stress limit is implemented according to the service conditions and stress limit requirements of asmeb & PVC III NF linear support. The bending stress limit is 0.6 times the yield strength of FRPP pipe, leaving a margin, and the design is more conservative. It is known that the yield strength of Q235 steel is 235mpa, and the limit value of bending stress is 141mpa. According to the previous limit state function:

z= σ w-fbmax。

where σ W is the limit value of bending stress, and fbmax is the large bending stress of cable tray during vibration

z ≤ 0 is the failure state. To calculate the reliability of cable tray is to calculate the probability of Z> 0

according to the situation under seismic load, the response spectrum in the room with the material elastic modulus (E2), damping ratio (damp), load (a) of the cable tray and the indoor temperature between 210 ° C and 10 ° C is taken as the random input variable; Taking the large bending stress (fbmax) and the limit 1 time state function (z) of the cable tray as random output variables, the structural reliability analysis of the cable tray is carried out

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