[Chai Jin cable tray to recommend the star product - the bridge] expansion and contraction problem: As the ambient temperature changes, expansion and contraction of the steel cable tray will appear phenomenon. Outdoor bridge influenced by temperature environment such as the maximum temperature is 40 ℃, the lowest temperature of -20 ℃, the maximum amount of shrinkage cable tray obtained the following formula: Δt = 11.2 × 10-6 × 60deg (degrees) × 1000mm by This concludes: When the temperature difference is 60 ℃, Δι = 0.672mm / m difference in temperature is 50 ℃ galvanized bridge, Δι = 0.560mm / m difference in temperature is 40 ℃, Δι = 0.448mm / m cable line segments in engineering design bridge expansion joints should be considered, spacing expansion joints take advice given in the following: When the temperature difference is 40 ℃ for 50m; 40m when the temperature difference is at 50 ℃; for 40m when the temperature difference is at 60 ℃; [Chai Jin cable tray to you Recommended 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. [Chai Jin cable tray to recommend the star product - the bridge] due to a variety of pipeline parallel to the cross within the building, space is limited, especially for large office buildings, commercial finance, hotels, stadiums and other buildings galvanized bridge trough, information point intensive, In addition to using the cable laying floor and wall pipe trenches way outside and inside the house in the shaft ceiling cable tray ceiling widely used to provide different direction wiring, cable weak system of classification of various cloth placed in the bridge, the most Best routing and installation according to the requirements of the position and combine architecture and air conditioning, electrical and other pipeline negotiations to be determined, the cable can not be passive and active cable laying side by side, under limited conditions placement within the same bridge, must be used during the metal partition divided, leads the cable to avoid cross-plane manufacturer of galvanized bridge, bridge crossing the bridge galvanized ground floor, while the wall or joints should be marked on the building plans to remain empty and the corresponding position, to avoid missing until the construction of a temporary air drilling, may hurt the civil engineering structures. To prevent electromagnetic radiation interference (EMC), in the design of the bridge should be considered a closed bridge. Strong galvanized bridge, Weinan galvanized tray, cable tray corporate integrity Chai Jin Chai Jin provided by Tianjin 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!