A shield tunnel lining segment and its reinforcement method

Abstract

The invention discloses a shield tunnel lining segment and further discloses a reinforcing method of the shield tunnel lining segment. An existing structure comprises a top-sealing block, a first adjoining block, a second adjoining block, a bottom-sealing block, a first standard block and a second standard block, wherein the first adjoining block and the second adjoining block are located at the two ends of the top-sealing block, and the first standard block and the second standard block are located at the two ends of the bottom-sealing block. The first adjoining block is connected with the first standard block, and the second adjoining block is connected with the second standard block. Steel strand hole passages are formed in the existing first adjoining block and first standard block, steel strands are arranged in the steel strand hole passages, and steel strand outlets are formed in the inner sides of the first adjoining block and the first standard block. The second adjoining blockand the second standard block are also treated in the same way. The reinforcing method comprises the steps that (1) the lining segment is prefabricated according to the borne load of a tunnel structure; (2) the stress condition of the lining segment is judged, and the reinforcing method of the lining segment is determined; and (3) the lining segment is reinforced. According to the shield tunnel lining segment and the reinforcing method, the overall rigidity and the deformation harmony of the tunnel structure are improved, and tunnel operation safety can be ensured.

Description

technical field [0001] The invention relates to the technical field of shield tunnel reinforcement for subway tunnels, in particular to a shield tunnel lining segment and a reinforcement method thereof. Background technique [0002] Subway tunnels generally use prefabricated concrete segments as the lining structure. During the operation phase of the tunnel, affected by adjacent construction, ground overload, and soil property variation, it is easy to cause large lateral deformation of the tunnel section, from circular to "duck egg shape", not only It will reduce the clearance of the tunnel, and it will also cause excessive opening of the segment joints, bolt damage, and segment concrete damage; the joint between the adjacent block and the standard block will open outwards, which will easily lead to the failure of the gasket and occur at the arch Water leakage seriously affects the safety of tunnel operation. [0003] At present, there are mainly the following solutions to ...

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Problems solved by technology

[0004] The reinforcement range of pasting carbon fiber and aramid fiber is limited to the tension area, and shape memory alloy is usually only used for internal reinforcement, and the most serious water leakage is the joint between the adjacent block and the standard block. This method cannot Processing; the installation of the inner supporting steel ring, the combination structure of "planting bar + steel mesh + steel plate + stud + concrete", and the tunnel segment rounder need to remove the original pipeline. The construction is complicated and the construction period is long. During the construction period, the tunnel will be affected. Normal operation, and will further reduce the tunnel clearance; when the full-ring segment is reinforced with prestressed steel strands, it is difficult to pass the steel strands from the outside of the segment, and it is difficult to avoid lateral deformation; the intelligent distributed optical fiber sensor Fiber composite bars are mainly used for monitoring, but it is not clear how to use them for reinforcement

[0005] Generally speaking, the existing lining segment reinforcement methods are mostly post-event remedial measures, that is, reinforcement and treatment are carried out after the deformation of the lining segment occurs, and it is difficult to prevent the deformation in advance; the reinforcement of the outwardly flared joints with serious water leakage The effect is not ideal, and the operation is complicated, which has a great impact on tunnel operation and high cost

At the same time, the existing methods are generally not capable of enhancing the stiffness of lining joints (or seams), the overall stiffness of the structure, and the control of deformation constraints.

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