Large section loess tunnel pre-cutting method construction method

Abstract

The invention discloses a large section loess tunnel pre-cutting method construction method comprising the following steps: using glass fibers and grouting so as to reinforce the tunnel face; using a pre-cutting device to carry out segment cutting along the tunnel design section; immediately casting concrete into the cutting groove so as to realize whole pre-lining of the tunnel arch wall portion, and lapping two-ring pre-linings; erecting a triangular belt steel rack and spraying concrete in a previous ring pre-lining horn mouth adjacent to the tunnel face; under the pre-lining protection, using an excavator to carry out tunnel full section excavation, determining deformation allowance according to stratum conditions, and applying wall feet-lock bolts; digging inverted arch, applying an inverted arch steel rack, and spraying concrete: spraying inverted arch formworking concrete, inverted arch filling concrete, and arch wall second lining concrete in sequence. The large section loess tunnel pre-cutting method construction method can control ground surface settlement, can reduce construction risk and collapse, can improve construction efficiency, can accelerate construction process, and can ensure construction quality.

Description

technical field [0001] The invention relates to an underground engineering technology, in particular to a construction method of a large-section loess tunnel by pre-cutting groove method. Background technique [0002] In the past hundred years, my country has built a large number of main railway lines, branch lines and special railway lines in the loess area. During the construction of loess tunnels, through the continuous exploration and summary of the predecessors in the field of tunnels in my country and the vast number of engineering and technical personnel, the construction technology of loess tunnels has evolved from excavation sections, theoretical research, construction methods, and excavation along with the development of my country's productivity level. There have been different degrees of development and progress in terms of construction methods, lining support structures, and construction organizations. [0003] At present, the construction of large-section loess...

AI Technical Summary

Problems solved by technology

These methods need to set up a large number of temporary supports and carry out partial excavation, so that the working space of the working face is small, which is not conducive to mechanized work, the labor intensity of the workers is high, and the construction efficiency is low; at the same time, there are many construction work procedures, slow construction speed, and large investment. But it is not economical; in the process of on-site implementation, many people are unwilling to apply it on a large scale, which leads to great difficulties in construction management. Even if some sections are implemented, they are often not in place, but they are prone to problems such as large deformation and even landslides.

Therefore, during the construction of loess tunnels, there are still problems in the tunnel construction that are prone to landslides and roof fall, and the construction risk is extremely high. The shallow buried section has a large surface settlement, is easy to crack, and has a great impact on the surrounding environment. Slow, high project cost and other issues

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