A shield tunnel multi-section, small clear distance, overlapping underpass viaduct construction method

Abstract

The invention discloses a construction method for a shield tunnel with multi-sections, small clear distances, and crossing viaducts under overlapping steps. The optimal construction sequence for the construction of the viaduct under the stacked drop; before the tunnel under the viaduct, carry out the active isolation and reinforcement of the shield tunnel under the viaduct at a short distance; carry out the construction of the shield tunnel under the viaduct; under the overlapping of multiple shield tunnels In the area passing through the viaduct, the segment structure of the shield tunnel is strengthened, and the inside of the tunnel hole is reinforced; the vibration reduction and isolation control of the track is carried out in the section passing through the viaduct under the shield tunnel.

Description

technical field [0001] The invention relates to the technical field of subway shield tunnel construction, in particular to a construction method for shield tunnels with multiple sections, small clear distances, and overlapping underpass viaducts. Background technique [0002] The statements herein merely provide background information related to the present invention and do not necessarily constitute prior art. [0003] With the continuous expansion of the scale of cities in our country, the construction of urban three-dimensional traffic has become the main trend of the development of transportation in the new era. Urban subways and viaducts are the main channels to realize three-dimensional traffic. The parallel development of the two will inevitably lead to multi-section subway tunnels. There are more and more cases of passing through viaducts with small net distances and overlapping underpasses. In particular, the two have relatively strict requirements on their respect...

AI Technical Summary

Problems solved by technology

[0004] The existing technology is mainly aimed at the isolation and reinforcement control of the shield tunnel passing through the viaduct orthogonally. The isolation and reinforcement mostly adopts enclosing structures such as bored piles, mixing piles, jet grouting piles, and even underground diaphragm walls to block the shield tunnel and the viaduct. The continuous deformation of the pile foundation has limited deformation control effect, and it is difficult to meet the construction safety control requirements for multiple complex working conditions such as water-bearing strata, multi-interval shield tunnels, and small clear distance overlapping crossing construction, and there is no combination of multiple control technologies Comprehensive control system and construction method

Images