A construction method for synchronous excavation of lower steps and inverted arches in large-section soft rock tunnels
A construction method and tunnel excavation technology, which is applied in tunnels, tunnel linings, earthwork drilling and mining, etc., can solve the problems of excavation support lag, mutual interference, unfavorable surrounding rock deformation, control support structure stability, etc., to ensure stability and construction safety, improve the progress of excavation construction, and avoid mutual interference
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[0026] The invention relates to a construction method for synchronously excavating lower steps and inverted arches of a large-section soft rock tunnel. The construction of the method can make the initial support concrete structure of the large-section soft rock tunnel form a fast closed loop, which is beneficial to the initial support concrete The stress state of the structure tends to be reasonable as soon as possible, effectively controlling the construction deformation of large-section soft rock tunnels, and ensuring the construction safety of large-section soft rock tunnel excavations. Mutual interference problems, thus effectively improving construction efficiency.
[0027] to combine image 3 , the present invention divides the excavation surface of the tunnel into four parts from top to bottom: the upper step 1, the middle step 2, the lower step 3 and the inverted arch 4. Excavators, simple platforms, arches, and steel mesh sheets are used in the construction method , ...
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