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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.

Active Publication Date: 2015-02-04
FUZHOU PLANNING DESIGN & RES INST
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Problems solved by technology

Existing tunnel widening construction technology generally refers to the construction technology of new long-span tunnels, and adopts step-by-step excavation methods such as upper and lower steps, CD method or CRD method; The existing tunnel widening construction technology often excavates or demolishes the existing tunnel structure and surrounding rock together. The excavation span is large and the construction is difficult

Method used

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  • Construction method for widening existing tunnel

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Embodiment Construction

[0031] Elaborate with specific embodiment below, as figure 1 As shown, an existing tunnel widening construction method includes the following steps:

[0032] 1) Backfill the lower steps in the existing tunnel with excavated ballast to form the lower step backfill layer 1, so as to form a lateral protection effect on the existing structure 6a at the left part of the lower step and the existing structure 7a at the right part of the lower step;

[0033] 2) Excavate the vault part 2 of the upper step, including excavating the surrounding rock of the vault part 2 within the central angle 14 of the existing tunnel vault, demolish the existing structure 2a of the vault within this range, and use the vault part 2 Backfill the upper step in the existing tunnel with the cavities produced by excavation, so as to form the upper step backfill layer 3 with lateral protection for the existing structure 4a at the left part of the upper step and the existing structure 5a at the right part of t...

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Abstract

The invention relates to a construction method for widening an existing tunnel. The construction method has the advantages that tunnel excavation slag is used for backfilling and reinforcing the interior of the existing tunnel, so as to form an effective lateral protection on the existing tunnel structure; by utilizing the partitioning and radial support actions of the existing tunnel structure on the excavated cross section for the widening of the tunnel, and the longitudinal support function on a tunnel surface of the interior of the tunnel, the existing tunnel structure can realize the space support effect similar to the space support effect similar to that of the core soil of the tunnel surface, and the deformation of surrounding rock can be effectively controlled; the construction method of arc-shaped staged excavation of upper steps, alternative excavation of rocked layers at the left sides and right sides of lower steps, and annular staged excavation of inverted arch sectional undercutting along the periphery of the existing tunnel structure is adopted, the width and height of staged excavation are reduced, the construction difficulty in widening of the tunnel is greatly decreased, and the temporary support measures are reduced or avoided; the method is suitable for three widening ways, namely widening at the right side, widening at the left side and widening at both the left side and right side, and the shifting of construction methods between different widening ways is simpler.

Description

technical field [0001] The invention relates to the field of tunnel engineering, in particular to a construction method for widening an existing tunnel. Background technique [0002] There are generally three ways to widen the existing tunnel in situ: one is to widen the existing tunnel to the right, and place the existing tunnel on the left side of the widened tunnel; the other is to widen the existing tunnel to the left, That is, the existing tunnel is located on the right side of the widened tunnel; there is another kind of widening to the left and right sides of the existing tunnel, and at this time the existing tunnel is located in the middle of the widened tunnel. Affected by many factors such as the distribution of buildings outside the existing tunnel, land use conditions, and wiring conditions outside the tunnel, there may be multiple combinations of existing tunnel widening methods, and there may even be three widening methods in the same tunnel. Different widening...

Claims

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Application Information

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IPC IPC(8): E21D9/01E21D11/00
CPCE21D9/00E21D11/00
Inventor 陈七林刘金福
Owner FUZHOU PLANNING DESIGN & RES INST
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