Construction method for widening existing tunnel
A technology of existing tunnels and construction methods, applied in tunnels, tunnel linings, earthwork drilling, etc., can solve problems such as high construction difficulty, large excavation span, and insufficient use of existing tunnel structures to support surrounding rock. , to reduce construction difficulty, control surrounding rock deformation, and reduce temporary support measures.
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[0031] The following is described with specific examples, such as figure 1 As shown, an existing tunnel widening construction method includes the following steps:
[0032] 1) Use excavated tunnels to backfill the lower steps in the existing tunnel to form the lower step backfill layer 1, so as to form a lateral protection for the existing structure 6a on the left of the lower step and the existing structure 7a on the right of the lower step;
[0033] 2) Excavation of the upper step vault section 2, including excavation of the vault section 2 surrounding rock within the range of the center angle of the vault of the existing tunnel, the removal of the existing structure 2a of the vault in this range, and the use of the vault section 2 The excavation caused by the excavation is used to backfill the upper steps in the existing tunnel to form the upper step backfill layer 3 with lateral protection for the existing structure 4a on the left of the upper step and the existing structure 5a ...
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