[Chai Jin cable tray to recommend the star product - Bridge] How to get fixed deflection deflection galvanized bridge, also there is no clearly defined galvanized tray manufacturers in the area obviously should consider reducing the burden around degrees, which means steel The amount will increase accordingly, and therefore, as long as the full use of the maximum allowable stress of the steel, and to ensure adequate safety factor calculation galvanized bridge, generally the maximum deflection of the span (distance between support points) ratio r 1/250 ~ 1 / 150 is appropriate. Expansion and contraction problems. [Chai Jin cable tray to recommend the star product - the bridge] in accordance with the relevant provisions of the grounding specifications galvanized bridge model, galvanized cable tray good grounding. (1) Each of galvanized cable tray plate bolts directly contact resistance should be less than 0.005Ω, this time as a cable tray grounding line (dusting cable trays are not suitable for grounding line), the value of each resistor type cable tray press calculated: r = ρ · L / S where: ρ = 15 × 10Ω-6 / cm (20 ℃); L = length calculated according to 100mm; S = cross-sectional area cm2. [Chai Jin cable tray to recommend the star product - bridge] (2) ladder to the tray unit resistance values ??in Table 2. Table 2 in units of resistance ladder tray (3) cable channel unit resistance values ??in Table 3 (4) When the cable tray installation and connection process as a whole, the ladder each side (or each cable channel) of resistance: R = L (r + 1 / 3r ') where: R-- ladder side, i.e., (cable trays) Length total resistance (mΩ); r-- ladder side resistance per unit length (mΩ / m) r' - Direct plate bolt contact resistance. Galvanized tray manufacturers | Yulin galvanized tray | well-known brands supplied by Tianjin Chai Jin Chai Jin bridge cable bridge Limited. Chai Jin Tianjin cable bridge Limited (www.tjcjdlqj.com) strong, credible, in Tianjin metal building materials industry has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead Chai Jin cable tray and you hand into the brilliant, for a better future!