Double-well type reinforcement method of shield arrival or starting end and double-well type shield arrival method

Abstract

The invention belongs to the technical field of shield arrival methods in shield tunnel construction engineering, in particular to a double-well type reinforcement method of a shield arrival or starting end and a double-well type shield arrival method, solving the problems of larger risks and high cost of the traditional shield arrival methods. The double-well type reinforcement method of the shield arrival or starting end is characterized in that an advance well is arranged outside a final arrival well or a station of the shield arrival or starting end. The invention has the advantages that water is blocked outside the advance well in advance by utilizing the advance well so as to ensure that a shield machine carries out arrival construction under the geological condition of no water, thereby radically changing an original geological condition, breaking up the huge risk of the shield arrival into parts, radically avoiding the huge risk of water and sand jetting during shield arrival in an area of a water and sand rich layer and reducing the hazard rate by more than 50 percent at least; and moreover, expenses generated by large-area full section reinforcement are saved to a certain extent. The invention has simple process method, convenient construction, low manufacturing cost and convenient popularization.

Description

technical field [0001] The invention belongs to the technical field of a shield tunnel receiving method in a shield tunnel construction project, and in particular relates to a double-well type reinforcement method for a shield tunnel receiving or starting end and a double-well type shield tunnel receiving method based on the same. Background technique [0002] As an advanced method of tunnel excavation, the shield method has been widely used in urban subways and other municipal and other large-scale projects. In the process of tunnel excavation, the construction safety and construction speed of the shield method are much higher than the existing new ones. Austrian method and other tunnel construction methods, however, the shield receiving section is the bottleneck of the entire shield tunnel construction, and the shield receiving technology is still a high-risk and high-cost construction section. [0003] The existing shield receiving technologies mainly include: [0004] ①...

AI Technical Summary

Problems solved by technology

Although this method effectively makes up for the defects of the first method, that is, it can effectively reinforce the surrounding soil of the tunnel section from the longitudinal direction, but its shortcomings are: on the one hand, it is necessary to achieve the predetermined reinforcement range and effect of grouting pressure. It is difficult to master, and it is easy to cause large-scale uplift of the ground, especially in the bustling areas of the city, which is extremely harmful; The mud layer often becomes a huge source of risk; moreover, this reinforcement method is expensive and only applicable to special projects and is difficult to popularize

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