Reinforcement method for existing segment structure of shield tunnel
A shield tunnel segment and segment technology, which is used in tunnels, tunnel linings, earth-moving drilling, etc., can solve the problems that cannot ensure the safety and normal use of the existing shield tunnel structure, affect the settlement or deformation of the track structure in the tunnel, The waterproof effect of the joints of the segments is deteriorated, so as to improve the stability and engineering characteristics, strong applicability and operability, and improve the integrity and deformation resistance.
Active Publication Date: 2017-05-31
CHINA RAILWAY DESIGN GRP CO LTD
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Problems solved by technology
The settlement or deformation of the segment structure is too large, which directly affects the settlement or deformation of the track structure in the tunnel, and the waterproof effect of the segment joints becomes poor, which in turn affects the safety of train operation
[0003] If the impact of adjacent or crossing construction on the structure of the existing shield tunnel is relatively small, it is possible to reduce the impact on the existing shield tunnel and ensure its normal operation and use by taking strengthening measures or adjusting the construction process for the structure to be constructed later; If the adjacent or crossing construction has a relatively large impact on the structure of the existing shield tunnel, and the structural safety and normal use of the existing shield tunnel cannot be guaranteed only by taking measures for the structures constructed later, it is necessary to study the impact on the existing shield tunnel. The tunnel structure takes certain reinforcement measures
Method used
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Embodiment 1
[0050] First of all, before the adjacent or crossing construction, in the section that has a relatively large impact on the crossing or adjacent construction, for the segment within the range above the design rail surface line 2, through the reserved grouting hole on the segment, drill the back of the segment into the formation The grouting pipe 1 is used for grouting and reinforcing the strata behind the segments to improve the mechanical properties of the stratum behind the segment lining 10 .
[0051] Secondly, for segment longitudinal joints 3 and segment annular joints 4 above the design rail surface line 2, segment caulking 5 is implemented with high modulus polyurethane sealant to improve the waterproof effect of segment joints.
[0052] Thirdly, clean the dust on the inner surface of the segment lining 10 of the shield tunnel, and use the modified epoxy resin glue 8 to paste the hoop steel plate 6 on the inner surface of the segment above the designed rail surface line ...
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The invention discloses a reinforcement method for existing segment structure of a shield tunnel. The reinforcement method comprises the following steps: reinforcement of the lateral stratum of existing segments of the shield tunnel, waterproof treatment of segment joints, reinforcement of the integrity of the shield segments and the ability to resist deformation, and construction control of adjacent structures. The reinforcement method for existing segment structure of the shield tunnel has the advantages of flexible construction, simple structure, mature construction technology, high reliability and good reinforcement effect, can improve the stability of both the lateral segments of tunnel surrounding strata and engineering characteristics, improve the integrity of the shield segments and anti-deformation ability and improve the waterproof effect at the joints of the shield segments, has good applicability and operability, and is safe and reliable.
Description
technical field [0001] The invention belongs to a reinforcement method, in particular to a reinforcement method for an existing shield tunnel segment structure. Background technique [0002] With the development and utilization of underground space, underground structures are becoming more and more dense, and more and more projects are adjacent to or passing through existing underground structures; as a kind of assembled and connected underground structure, shield tunnel is a flexible structure, no matter which Adjacent to or crossing construction of these construction methods will have varying degrees of impact on the existing shield tunnel segment structure. The settlement or deformation of the segment structure is too large, which directly affects the settlement or deformation of the track structure in the tunnel, and the waterproof effect of the segment joints becomes poor, which in turn affects the safety of train operation. [0003] If the impact of adjacent or crossi...
Claims
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Patent Timeline
Login to View More IPC IPC(8): E21D11/00E21D11/10E21D11/18E21D11/38
CPCE21D11/003E21D11/105E21D11/18E21D11/385
Inventor 唐伟张继清王世清李得昌王乐明
Owner CHINA RAILWAY DESIGN GRP CO LTD