A shield tunnel multi-section, small clear distance, overlapping underpass viaduct construction method
A technology of shield tunneling and construction method, which is applied in the field of shield tunnel multi-section, overlapping viaduct construction, and small net distance, and can solve the problem that the comprehensive control system and construction method that have not formed the combination of multiple control technologies are difficult to meet the construction requirements. Safety control requirements, limited effect of deformation control, etc., achieve the effect of improving soil mechanical properties, reducing crossing construction risks, reducing additional stress and superimposed deformation
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[0082] In order to further describe the technical solution of the present invention, the following will be combined with specific examples and appended Figure 1-Figure 7 , for a more detailed description.
[0083]The project described in this embodiment is 4 shield interval tunnels, small clear distance, overlapping and underpassing high-speed railway bridge 3 projects, of which 4 shield interval tunnels correspond to the two shield tunnel tunnel intervals 1 and 2 in the figure. Uplink section 2 of a shield tunnel is excavated by active articulated earth pressure balance shield machines. The outer diameter of the cutter head is 6.68m. The shield segment 8 adopts a single-layer reinforced concrete assembly structure with an outer diameter of 6.4m and an inner diameter of 5.8m. m, thickness 0.3m, and ring width 1.2m. The segment ring is divided into six pieces, consisting of one capping block K, two adjacent blocks B, and three standard blocks A, which are assembled by staggere...
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