Control and reinforcement method of soft soil shield starting

Abstract

The invention discloses a control and reinforcement method of soft soil shield starting. The method comprises the following steps that step one, a starting bracket and a reaction frame are installed and reinforced; the starting bracket is used for fixing the positionof a shield machine, bearing the dead weight of the shield machine, fixing negative loop ducts, and adjusting the center of the shield machine to reach an elevation when the shield machine is started; the reaction frame is used for providing counter-force for shield machine propulsion, and steel pipe inclined braces are additionally arranged on the reaction frame; step two, tips are reinforced; a three-axis mixing pile and a high pressure jet groutingpile are used for reinforcing, and the position between an underground diaphragm wall and a reinforced area of the three-axis mixing pile is reinforced by the high pressure jet grouting pile; step three, precipitationconstruction is carried out; a precipitation well is formed in the reinforced area of the three-axis mixing pile, and when the shield machine enters and exits from a portal of a tunnel, the precipitation well is operated and is matched with the shield machine to work; and step four, effects of precipitation and tip reinforcing are detected; a pumping test is carried out on the precipitation well to detect the precipitation effect. When the shieldmachine isstarted, conditions are created for adjusting postures after the shield is started, and the problems of the shield pitching up, overlying soil instability, surface uplifting and sinking, water leakageand the like are prevented.

Description

technical field [0001] The invention belongs to the technical field of tunnel construction, and in particular relates to a soft soil shield initiation control and reinforcement method. Background technique [0002] In recent years, as the scale of cities in our country has doubled, the problem of backward infrastructure has emerged, and the contradictions of urban transportation have become increasingly prominent. With its advantages of safety, punctuality and speed, the subway is playing an increasingly important role in expanding urban space, creating urban rapid three-dimensional traffic network and improving urban traffic environment. Major cities across the country are actively planning and constructing subway projects according to the needs of sustainable urban development and the healthy development of urban transportation. However, the soil in some areas is soft, which is prone to accidents during the shield tunneling process. The start of the shield machine is one...

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Problems solved by technology

However, the soil in some areas is soft, and accidents are prone to occur during the shield tunneling process

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