[Chai Jin cable tray to recommend the star product - Bridge] checking the formula: Q = q1 + q2 using the formula: q1 - Cable uniform load (layers of uniform load of maximum value) (kN / m2) ladder bridge Which is good, uniform load is a tray, ladder or cable tray load; q2-- consider cable laying or maintenance, the person's weight equivalent uniform load (kN / m2), q2 value The calculations were generally based on the weight of p = 90kg dollars. Said the concentrated load and uniform load bending moment 2 by Maximum bending moment equal conditions shown in translation: Let pι / 4 = q2ι2 / 8 则 q2 = 2p / ι∵P = 90kg∴q2 = 180 / ι where: P --1 people load (kg) ι - 1 support points spacing (maximum value if the fulcrum distance range) (m) q2--1 human equivalent uniform load (kg / m) based on the preliminary determine the bridge models, specifications and fulcrum distance, consult the manufacturer of the sample data, cross-check the spacing and bridge models, until meet the load requirement. [Chai Jin cable tray to recommend the star product - the bridge] expansion and contraction problem: As the ambient temperature changes price ladder bridge, steel cable bridge will be expansion and contraction of the phenomenon. Outdoor bridge influenced by temperature environment such as the maximum temperature is 40 ℃, the lowest temperature of -20 ℃ ladder bridge, the largest cable tray shrinkage obtained the following formula: Δt = 11.2 × 10-6 × 60deg (degrees) × 1000mm conclude: When the temperature difference is 60 ℃, Δι = 0.672mm / m when the temperature difference is 50 ℃, Δι = 0.560mm / m difference in temperature is 40 ℃, Δι = 0.448mm / m cable line segments in engineering design bridge should consider how much money ladder bridge expansion joints, expansion joint spacing take the following advice given: 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 ℃; [Cai into the 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 when the temperature difference is 50 ℃, Δι = 0.560mm / m difference in temperature is 40 ℃, Δι = 0.448mm / m engineering design cable tray straight sections should be considered expansion joint, expansion joint spacing take the following advice given: 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 ℃; ladder bridge model Mentougou ladder bridge _ _ Tianjin Tianjin bridge preferred by Chai Jin Chai Jin cable tray 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!