Shield body grouting structure and construction method for shield excavation in water-rich sand and pebble strata

Abstract

The invention discloses a shield body grouting structure and a construction method for excavating a shield body in a water-rich sand and pebble stratum, comprising: a shield excavation channel, the shield excavation channel is arranged in a water-rich sand and pebble stratum, and is formed by a water-rich The sand and pebble formation extends into an adjacent formation connected to the water-rich sand and pebble formation. The injection molding in the shield excavation channel has the same structure but different injection molding methods, the first grouting double-circle and the second grouting double-circle. The slurry double-circle is connected with the end of the first grouting double-circle and extends from the water-rich sand pebble formation to the adjacent formation. Both the first grouting double-ring and the second grouting double-ring are double-ring structures composed of inner and outer rings of different materials, so that the previously constructed outer ring can fill the inner wall surface of the shield excavation channel. The particle pores form a closed mud film, and the first double grouting ring and the second double grouting ring are also used to support the excavation channel of the shield machine.

Description

technical field [0001] The invention relates to the field of shield tunnels, in particular to a shield body grouting structure for shield excavation in water-rich sand and pebble formations. In addition, the present invention also relates to a construction method for shield excavation shield grouting structure in water-rich sand and pebble stratum for constructing the shield excavation grouting structure in water-rich sand and pebble stratum. Background technique [0002] With the continuous deepening of urbanization in my country, the development and construction of underground space has received unprecedented attention and attention. The design and construction mileage of tunnels for traffic tracks and municipal utility corridors continue to set new records, and will continue to maintain a high-speed development trend in the future. However, due to the speed of construction development and the complexity of the underground environment, there are still many engineering prob...

AI Technical Summary

Problems solved by technology

[0005] The invention provides a shield body grouting structure and construction method for shield excavation in water-rich sand and pebble strata to solve the problem of sudden subsidence after the shield tail comes out in the traditional excavation process of water-rich sand and pebble strata Deformation, cement grouting body is easily diluted by water-rich strata, serious problems of slurry running and stringing, and prominent water seepage problems

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