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137results about How to "Strong construction" patented technology

Excavation and support method of large cross-section tunnel through fault fracture zone

The invention discloses an excavation and support method of large cross-section tunnel through fault fracture zone. The initial support structure of tunnel comprises a whole cross-section support system and the lattice girder and shotcrete support structure of the tunnel. A temporary support structure of middle-partition wall is arranged between a left pilot tunnel and a right pilot tunnel. The actual construction includes the steps: 1, excavation of the upper tunnel body; 2, the judgment of the initial support deformation of the tunnel arch wall and the construction of the replacement arch; 3, excavation of the lower tunnel body. The excavation and support method of large cross-section tunnel through the fault fracture zone has reasonable design, simple construction, and good use effect.Only the upper half section of the tunnel is excavated by the center diaphragm method, and the excavation cross-section is reduced so that the stability of the arch roof is ensured. The whole cross-section support system and the temporary support structure of middle-partition wall are supported by the underpass beam and joined together to form a stable monolithic support system, which can avoid the sinking of the supporting arch and ensure the stability of the initial support effectively. Besides, the construction of replacement arch is conducted on only half cross-section of the tunnel and the cost can be saved, and the construction safety can be ensured.
Owner:CHINA RAILWAY 20 BUREAU GRP

Construction method of large-section tunnel crossing fault fracture zone

The invention discloses a construction method of a large-section tunnel crossing fault fracture zone. The construction tunnel cavern is divided into a tunnel upper cavern body, a tunnel lower cavern body and a tunnel bottom cavern body from top to bottom; the tunnel upper cavern body comprises a left pilot tunnel and a right pilot tunnel; the tunnel lower cavern body is divided into a left cavernbody, a left-middle cavern body, a right-middle cavern body and a right cavern body from left to right; practical construction comprises the following steps: (I) excavating the tunnel upper cavern body; (II) excavating the tunnel lower cavern body; (III) excavating the tunnel bottom. The method disclosed by the invention has the advantages of simple steps, reasonable design, convenience in construction and good using effect; only the upper half section of the tunnel is excavated by median septum excavation, thus the excavation section is reduced, and the vault stability is guaranteed; moreover, the left and right pilot tunnels have enough space and thus the construction is facilitated; meanwhile, a full-section support system and a mid-partition temporary support structure are both supported through lower bearing beams and are connected to form an overall support system with a stable structure, thus sinking of the primary support arching can be avoided while the stability of primary support is effectively guaranteed.
Owner:CHINA RAILWAY 20 BUREAU GRP
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