Tunneling construction method for penetrating operating tunnel under shield in water-rich silt stratum

Abstract

The invention relates to the technical field of tunnel construction, in particular to a tunneling construction method for penetrating an operating tunnel under a shield in a water-rich silt stratum. The method comprises the steps of a, conducting test tunneling to obtain construction parameters; b, configuring a double-grout grouting system, a rinsing system and a mixer on the shield, wherein the mixer is used for mixing double-grout conveyed by the double-grout grouting system; c, determining the matching ratio of the double-grout; d, according to the construction parameters obtained in the step a, conducting formal shield construction; e, adopting a technology that water is added or bubbles are grouted to conduct muck conditioning, and synchronously conducting double-grout grouting construction; f, conducting solidification treatment on a soil mass outside a segment in a tunnel. According to the tunneling construction method for penetrating the operating tunnel under the shield in the water-rich silt stratum, by arranging the double-grout grouting system, after the grout is sufficiently mixed through the arranged mixer, and after the mixed grout is grouted to the back of the segment synchronously, the grout quickly solidifies and reaches the demanded strength, the water stop effect is effectively formed, and thus the occurrence of sedimentation in the constructing process of the soil mass is avoided.

Description

technical field [0001] The invention relates to the technical field of tunnel construction, in particular to a tunneling construction method for a shield tunnel to pass through an operating tunnel in a water-rich powder soil stratum. Background technique [0002] In recent years, my country's urban rail transit has developed rapidly. In the process of urban tunnel construction, shield machines are usually used for tunnel excavation. Due to the influence of urban environment and subway lines under construction in the planning of shield tunnels, new construction The subway lines will inevitably intersect with the existing tunnels for construction, which will easily cause damage to the existing tunnels, and major safety accidents such as collapse and subsidence will occur. In the prior art, there is no construction method for this kind of underpass operation tunnel, and the accumulation of experience in construction methods is mainly concentrated in the construction process of o...

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Problems solved by technology

[0004] The purpose of the present invention is to: when excavating tunnels under the shield tunnel under the water-rich powdery soil layer, due to the small amount of grout injected and the inability to solidify quickly, the water can not be effectively stopped, and the strength cannot meet the requirements at the same time, and the construction soil is prone to Settlement caused huge safety hazards to the tunnels already in operation, and it was impossible to ensure safe and smooth construction. A tunneling construction method for shield tunnels passing through operational tunnels under water-rich powdery soil strata is provided. This method uses a double-fluid grouting system , and after the grout is fully mixed by the set mixer, the mixed grout is poured into the back of the segment synchronously, so that the grout can quickly solidify and quickly reach the required strength, effectively forming a water-stop effect, thereby preventing the soil from occurring during the construction process. Settlement affects tunnels already in operation

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