Segmented Construction Method of Ultra-long Tunnel Using TBM to Construct Inclined Shaft and Pilot Pit

Abstract

The invention relates to a segmented construction method of extra-long tunnels by adopting development machines to construct inclined shafts and headings first. The inclined shafts and the headings of the parallel right and left tunnels are advanced first by the two minor-diameter development machines, so that the segmented construction of the two parallel tunnels can be achieved, and the downhill drainage of the tunnels and segmented tunnel ventilation can also be achieved. The segmented construction method has the characteristics that the segmented construction method is safe, rapid, and suitable for the construction of the extra-long tunnels in a mountainous area in China, and the development machine cost is lower.

Description

Technical field: [0001] The invention belongs to a tunnel construction method, in particular to a segmented construction method in which an inclined shaft and a pilot pit are first constructed by a boring machine for an extra-long tunnel. Background technique: [0002] At present, the construction methods of extra-long tunnels mainly adopt the drilling and blasting method and the excavation method. These two methods have the following shortcomings: [0003] 1. Drill and blast method: [0004] (1) In order to reduce the vibration of the surrounding rock by the drilling and blasting method, although smooth blasting and pre-split blasting have been achieved, the disturbance to the weak surrounding rock cannot be overcome by blasting. [0005] (2) In the construction of long tunnels, setting up multiple inclined shafts and dividing the long tunnel into several sections is a common method to shorten the construction period. However, since the drilling and blasting method is ve...

AI Technical Summary

Problems solved by technology

However, due to the slow construction of inclined shafts by drilling and blasting, it is necessary to increase the number of inclined shafts to speed up the progress and save the construction period, thus increasing the cost of tunnel construction and destroying the surrounding vegetation and groundwater environment of tunnel inclined shafts

[0006] (3) The drilling and blasting method cannot connect the various processes in the tunnel excavation process, thus affecting the construction speed and construction safety

At present, large-diameter roadheaders with a diameter greater than 10m are generally used in tunnel construction in my country. Due to the large diameter of roadheaders, it not only increases the investment in roadheader equipment, but also increases the difficulty of use and transportation in long tunnels in mountainous areas.

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