A construction method for forward progress of oblique and biased tunnels

Abstract

The present invention relates to a construction method for oblique bias tunnel forward progress, comprising the following steps: (1) measuring and setting out to determine the relationship between the tunnel body and the upward slope; (2) protecting the upward slope by hanging nets and spraying anchors, and backfilling the triangular core soil; (3) Construct the arch foundation, install steel plate embedded parts on the top surface, and then erect the arch frame; (4) Determine the offset distance Li from BC to AC one by one according to the distance L of the initial support arch frame of the dark cave; divide the whole area according to the offset distance Li , corresponding to the formation of side wall arch Ⅰ and side wall arch Ⅱ, and corresponding numbering corresponding to each other; ⑸ According to the number, two sills and one cycle are installed; ⑹ sprayed concrete construction; Fan-shaped primary support tunnel body; ⑻fixed to form a fan-shaped pipe shed; ⑼remaining process of construction guide wall; ⑽side wall arch II construction along the BC direction of the tunnel body step by step, and then radial grouting construction, and installation of diameter to the tube. The invention can realize safe tunnel entry under the condition of minimum damage to the tunnel side elevation slope.

Description

technical field [0001] The invention relates to the technical field of oblique tunnel entry, in particular to a construction method for oblique bias tunnel forward advancement. Background technique [0002] With the continuous extension of highway construction in the western mountainous area, due to the limitation of the mountainous terrain and the overall layout of the line in the process of line selection along the river and the mountain, it is inevitable that the tunnel axis will obliquely intersect with the mountain contour line, or during the construction After the design was completed, human production activities destroyed the original topography of the tunnel entrance, resulting in changes in the working conditions of the tunnel entrance. One side of the tunnel fell to the bottom and the side slope was tens of meters high with loose surrounding rock, making it impossible to construct the tunnel orthogonally. Contents of the invention [0003] The technical problem t...

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Problems solved by technology

[0002] With the continuous extension of highway construction in the western mountainous area, due to the limitation of the mountainous terrain and the overall layout of the line in the process of line selection along the river and the mountain, it is inevitable that the tunnel axis will obliquely intersect with the mountain contour line, or during the construction After the design was completed, human production activities destroyed the original landform of the tunnel entrance, resulting in changes in the tunnel entry conditions. One side of the tunnel fell to the bottom and the side slope was tens of meters high.

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