Pouring method of advanced curtain

Abstract

The invention relates to the technical field of tunnel construction and discloses an advanced curtain pouring method. The method mainly comprises the following steps of S1, advanced geological forecast; S2, surveying and setting out, determining a forming position of a curtain layer so as to determine drilling positions of grouting holes, and marking the drilling positions, the distances between two adjacent grouting holes being equal; S3, pouring a grout stop wall; S4, pipe burying being carried out, specifically, drilling being carried out at the marked drilling position to the required depth, and an orifice pipe being buried; continuously drilling along the orifice pipe to a designed depth; S5, grouping, the grouting holes being grouted according to the sequence that the outer ring holes and the bottom holes are firstly grouted, then the middle holes being grouted after sealing is conducted, grouting being conducted from bottom to top, and grouting being conducted on each ring of drill holes at intervals; and S6, a plurality of inspection holes being formed in the side, away from the fault fracture zone, of the curtain layer, and whether the water outlet condition in the inspection holes meets the standard or not being detected. The method is advantaged in that a curtain wall has the effect of improving structural strength uniformity of the curtain wall.

Description

technical field [0001] The present application relates to the field of tunnel construction, in particular to an advanced curtain pouring method. Background technique [0002] The distribution of karst areas in my country is very extensive, reaching nearly 3.4 million square kilometers, making it the country with the widest distribution of karst areas in the world. With the high-speed construction of major infrastructure projects such as transportation, water conservancy and hydropower in my country, more and more engineering facilities are gradually transferred underground and built in karst areas. [0003] During the construction of high-pressure water-rich karst tunnels, when there are soft rocks, water-rich, filled karst caves and other unfavorable geology in front of the tunnel face, excavation is carried out directly, which is prone to geological disasters such as landslides, water and mud inrush, and karst water inrush. Geological disasters have gradually become a bott...

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Problems solved by technology

[0005] In view of the related technologies mentioned above, the inventor believes that if holes are drilled and grouted radially, the distance between two adjacent grouting holes will gradually increase, and the amount of soil between the two grouting holes will also increase. The internal structural strength of the components formed by slurry molding is not uniform, and there is a defect of uneven strength of the curtain wall

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