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Tunnel two-expansion four-expansion excavation method

A technology for tunnel and tunnel construction, which is applied in the direction of tunnel, tunnel lining, earthwork drilling and mining, etc. It can solve the problems of weak excavation and support, easy landslide, large engineering quantity, etc., and achieves wide terrain adaptability, fast project progress, The effect of temporarily supporting the axial force is small

Active Publication Date: 2019-04-09
浙江省隧道工程集团有限公司
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Problems solved by technology

[0004] Aiming at the disadvantages of weak excavation and support in the prior art, easy to collapse, large engineering quantity, etc., the present invention provides a tunnel two-expansion and four-expansion excavation method

Method used

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  • Tunnel two-expansion four-expansion excavation method

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Embodiment 1

[0043] A method for tunnel expansion and excavation with two expansions and four expansions, including the construction method for tunnels in grade IV and V surrounding rocks, and the construction method for tunnels in grade III surrounding rocks, wherein the construction methods for tunnels in grades IV and V surrounding rocks include the following construction steps: excavating the tunnel Partitioning is carried out, including part I in the middle of the vault, part II on the left side of part I, part III on the right side of part I, part IV on the lower side of part II, part V under part III and part VI under part I;

[0044] Step 1. Existing tunnel backfilling, reinforcement and grouting:

[0045] Step 2, excavation and support of part I of the vault;

[0046] Step 3: Excavation and support for part II on the upper left;

[0047] Step 4. Excavation and support of Part III on the upper right;

[0048] Step 5. Excavation and support of the IV part of the lower left;

[00...

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Abstract

The invention relates to the field of tunnel excavation. The invention relates to a tunnel expanding excavation method. The method comprises IV-level and V-level surrounding rock tunnel construction methods and further includes an III-level surrounding rock tunnel construction method. The IV-level surrounding rock tunnel and the V-level surrounding rock tunnel construction methods comprise the following construction steps that an excavated tunnel is partitioned, and the excavation tunnel comprises a first part in the middle of an arch crown, a second part on the left side of the first part, athird part on the right side of the first part, a fourth part on the lower side of the second part, a V part on the lower portion of the third part and a VI part on the first part. According to the construction methods, double-side-wall partial excavation is adopted, and the excavation mode of first arching and then wall excavation has the advantages that the arch crown sinking is minimum, the horizontal displacement is small, the temporary supporting axial force is minimum, supporting is reliable, and the project progress is fast. And the scheme is very suitable for expanding excavation construction of tunnels with ultra-large spans, ultra-large sections and small intervals, the construction safety is high, and the phenomena of collapse and the like are avoided.

Description

technical field [0001] The invention relates to the field of tunnel engineering, in particular to a method for excavating a tunnel with two expansions and four expansions. Background technique [0002] A road tunnel is a channel dedicated to vehicle transport. With the development of social economy and production, a large number of expressways have appeared, and higher standards have been put forward for road construction technology, requiring straight lines, gentle slopes, and spacious road surfaces. Therefore, when the road passes through the mountainous area, the scheme of detour around the mountain in the past is mostly changed to the tunnel scheme. The construction of tunnels plays an important role in improving the technical status of highways, shortening running distances, increasing transportation capacity, and reducing accidents. [0003] With the development of society, the increase in the number of cars, and the widening of roads, the capacity of the original tu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21D11/10E21D20/00E21D9/00
CPCE21D9/006E21D11/105E21D11/107E21D20/00
Inventor 康三月项斌徐友樟郭红里陈艳春
Owner 浙江省隧道工程集团有限公司
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