Abstract:

A full process crawlertype invert trestle for highspeed railway tunnel is developed to shorten the full process working time, improve the construction schedule, reduce the construction cost and input of construction personnel and auxiliary materials of invert. The bottom of the main trestle is composed of three 12m working areas, i.e. foundation bottom cleaning and steel bar binding, invert lining and invert backfilling, and invert curing; mechanical devices are equipped to every working area; and hydraulic crawler is used to drive the trestle. The structural composition of the full process crawlertype invert trestle and design of main bridge, front and rear slope bridge, driving system, invert lining system and auxiliary tool are emphatically introduced; the strength of the main parts of full process crawlertype invert trestle is checked; and the full process crawlertype invert trestle is applied to Xiangjiawan Tunnel on Hubei Section of ZhengzhouWanzhou Highspeed Railway. The applicable results show that: (1) Only 36 hours are needed for full process construction of 12m invert, RBM 134.91 yuan can be saved per meter in Grade Ⅳ surrounding rock tunnel comparing to ordinary invert trestle. (2) The abovementioned invert trestle can be applied in complex tunnel environment with stable performance and low fault rate.

Key words: ZhengzhouWanzhou Highspeed Railway, highspeed railway tunnel, full process crawlertype invert trestle, invert lining, technology and process equipment, structural design