Abstract:

Fangdoushan tunnel in B12 contract section of ShiZhong expressway in Chongqing has smallradius, longcurve and steepgradient inclined ventilation shafts. If the existing sectionalized transportation method or conveyer belt transportation method is adopted for the inclined shafts, the safety level and transportation efficiency will be low. Owing to the installation of vertical pentagonal rollers in curved track sections and installation of steel rope clampers to the mining cars, the traction steel ropes are brought into restriction and the mining cars can travel along the curved tracks. Thereby, the track transportation system consisting of hoisting cranes, tracks and mining cars is applied in the smallradius longcurve inclined shafts. The transportation system has the characteristics of high safety, rapid construction speed and low cost. The development, design, testing, installation and operation of this technology are presented and the economical and social significances are analyzed.

Key words: inclined shaft, small radius, long curved section, hoisting crane, vertical pentagonal roller, steel rope clamper, track transportation system