Construction technology of a cantilever roadheader for a double-track large-section tunnel adjacent to a high-speed railway

Abstract

The invention provides a cantilever roadheader construction technology for a double-line large-section tunnel adjacent to a high-speed railway, and belongs to the technical field of tunnel construction adjacent to an existing line. The process is to divide the cross-section of the double-line tunnel into an upper step, a lower step and an inverted arch, and divide the upper step into an upper part of the upper step and a lower part of the upper step, and use the excavation method combining a cantilever roadheader and a crushing head for construction; The upper part of the upper step and the lower part of the upper step are constructed with a cantilever roadheader. The lower steps are excavated with a crushing head and a cantilever roadheader. Head digging. The invention adopts the "three steps and nine section method" construction, step by step, reduces the impact on the existing line, solves the problem that the cantilever roadheader is not suitable for controlling the excavation surface due to the large excavation surface of the double-line large-section tunnel, and improves work efficiency. At the same time, the loss of the roadheader is reduced, and the construction safety of the existing line is ensured.

Description

technical field [0001] The invention belongs to the technical field of tunnel construction adjacent to existing lines, in particular to a cantilever roadheader construction technology for a double-line large-section tunnel adjacent to a high-speed railway. Background technique [0002] The 21st century is the century of underground space. In recent decades, with the continuous development of production and the improvement of people's social activities, the level of mechanization needs to be gradually improved to meet the growing needs of production and people's lives. At present, domestic tunnel construction is still often carried out by blasting. The construction of tunnels adjacent to existing lines adopts the general traditional blasting construction method, which greatly disturbs the existing lines, and will affect the construction period and delay the progress of the project. [0003] Domestic cantilever roadheaders are rarely used in tunnel construction. At present, ca...

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Problems solved by technology

At present, domestic tunnel construction is still often carried out by blasting. The construction of tunnels adjacent to existing lines adopts the general traditional blasting construction method, which greatly disturbs the existing lines, and will affect the construction period and delay the progress of the project.

[0003] Domestic cantilever roadheaders are rarely used in tunnel construction. At present, cantilever roadheaders are mainly used in coal and mining industries, and are rarely used in tunnels. They are generally used in small-section tunnels, and the two-step four-section method is adopted. This construction method is easy to control the operation of the roadheader for small-section tunnels, including the conversion between mechanical equipment and trolleys; while the whole tunnel is adjacent to the existing high-speed railway line and passes under the existing high slope. The cantilever roadheader is used for construction in China Not seen yet

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