Excavation tunnel construction method

A technology for tunnel construction and tunneling, which is applied in tunnels, tunnel linings, earthwork drilling and mining, etc. It can solve problems such as differences in construction techniques and technologies, construction difficulties, etc., and achieve good construction effects, ensure excavation stability, and construction efficiency fast effect

CN108457656AInactive Publication Date: 2018-08-28BEIJING MUNICIPAL CONSTR
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2018-08-28
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses an excavation tunnel construction method. An excavation tunnel is constructed through a CD method and has the total length of 37.7 m, and each guide hole is constructed througha step method and excavated annularly with core soil reserved and has the step length not smaller than 5 m; the excavation tunnel is excavated from the left guide hole and the right guide hole, eachguide hole is provided with an upper step and a lower step, the core soil is reserved in the excavating process, depressurizing grooves are formed, manual excavation is adopted, and the excavation stability is ensured; three grids are continuously erected at an ingate at the interval of 400 mm, the distance between the last grid and the upper grid is 550 mm, and the other distances are 500 mm. Seventy-six grids are used in total. Steel welding pipes with the diameter of 40*2.75 adopted for small guide pipes have the length of 2 m and the annular distance of 300 mm and are longitudinally spacedfrom the grids; upper step construction, lower step construction, advanced grouting, soil body excavation, grid erection, primary support construction, feet-lock bolt arrangement, concrete spraying and behind-primary-support grouting are sequentially completed, the construction efficiency is high, and the construction effect is good.
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Description

technical field

[0001] The invention relates to the technical field of tunnel construction, in particular to an excavated tunnel construction method. Background technique

[0002] After the 1990s, many cities in our country began to launch subway projects, and began to introduce and apply international advanced shield construction technology and equipment on a large scale. The subway projects were rapidly constructed in some cities, and the ground subsidence technology covered by them developed accordingly. my country's application of the shield method to build tunnels began in Shanghai in the 1950s and 1960s. With the in-depth research of shield tunneling method and the increase of engineering applications, the construction technology of shield tunneling method has been developed and improved. In recent years, shield tunneling technology has made significant progress. There are also differences in the mastery of the construction techniques and technologies of different me...

Examples

Embodiment Construction

[0038] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0039] In an embodiment of the present invention, a construction method of an unearthed tunnel is described. The excavated tunnel is constructed by the CD method, with a total length of 37.7m. Each pilot tunnel is constructed by the step method, and the core soil is reserved for circular excavation. The length of the step is not less than 5m. see figure 1 The flow chart of the excavated tunnel construction process is shown.

[0040] The construction steps of...