Continuous beam type anti-floating structure of shield tunnel

Abstract

The invention discloses a continuous beam type anti-floating structure of a shield tunnel. The continuous beam type anti-floating structure comprises a plurality of pile caps arranged longitudinally along the shield tunnel at intervals, the pile caps are transversely arranged above the shield tunnel, an uplift pile used for fixing is arranged below each pile cap, and a stratum reinforcing layer used for integrally connecting the pile caps, the uplift piles and the shield tunnel is arranged between the lower surface of the pile caps and the top surface of the shield tunnel. The continuous beam type anti-floating structure is applicable to the shield tunnel.

Description

technical field [0001] The invention relates to the field of shield tunnels, in particular to a continuous beam anti-floating structure of shield tunnels. Background technique [0002] The anti-floating design of the shield tunnel is an important design part of the shield tunnel, which directly affects the line design and the determination of the construction scale of the tunnel. safety factor requirements. Specifically, the anti-floating design of the shield tunnel needs to meet the anti-floating stability requirements, and the formula is as follows: [0003] G k F w ≥ K w [0004] In the formula: G k - Anti-buoyancy of the tunnel, which is composed of the anti-buoyancy provided by the tunnel's own weight, ballast or other measures; [0005] f w - buoyancy value of the tunnel; [0006] K w ——Safety factor of anti-floating...

AI Technical Summary

Problems solved by technology

[0012] (1) The ground is heavily loaded and ballasted, and this anti-floating measure is generally difficult to achieve due to ground conditions during long-term operation;

[0013] (2) Use the useless space in the shield tunnel to fill concrete or other counterweight materials to increase the self-weight of the tunnel, but because the internal space of the shield tunnel is limited, the increased counterweight in the tunnel may not be able to completely overcome the buoyancy In some cases, it still cannot meet the safety requirements for anti-floating stability;

[0014] (3) Add a portal frame structure above the entire shield tunnel to increase the tunnel weight. The anti-floating measures require a large amount of work and high cost;

[0015] (4) Holes are opened in the internal structure of the shield tunnel, small uplift piles or anti-floating anchors are installed, and waterproof devices are installed. The anti-floating measures can increase the anti-buoyancy force less, and cannot fully meet the safety requirements for anti-floating stability

[0016] Therefore, several existing anti-floating measures have their own problems in actual construction, and cannot meet the actual construction needs.

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