Concrete dam abrupt slope foundation surface repeated contact grouting structure and grouting method thereof

Abstract

The invention discloses a concrete dam abrupt slope foundation surface repeated contact grouting structure and a grouting method thereof, and particularly discloses a concrete dam abrupt slope foundation surface repeated contact grouting structure for carrying out repeated supplementary grouting when the contact surface of a concrete dam and a foundation surface is expanded and a grouting method thereof. The grouting structure is arranged at an abrupt slope section of the concrete dam and is divided into a plurality of irrigated areas in a direction vertical to the water flow; each irrigated area is internally provided with two sets of grouting pipelines, each set of grouting pipeline comprises a grouting pipe, the grouting pipes are transversely arranged U-shaped pipes, the bottom pipe orifices are grout inlets and the upper pipe orifices are grout return ports; and the grouting pipes are two-layer structures which respectively comprise an inner layer and an outer layer, the inner parts of the grouting pipes are PVC pipes, grout outlets are alternately formed in the PVC pipes, the outer parts of the grouting pipes are elastic rubber casing pipes, and diffusion holes are alternately formed in the rubber casing pipes. The structure is capable of carrying out contact grouting construction for the first time when the field practical condition achieves the design requirements, andadopting the same set of pipeline to carry out complementary grouting when the contact surface of the concrete dam and the foundation surface is expanded again.

Description

technical field [0001] The invention relates to the field of water conservancy and hydropower engineering construction, in particular to a concrete dam steep slope foundation surface that does not affect the water storage task of the dam and the project operation target, and can perform repeated supplementary grouting when the contact surface between the concrete dam and the foundation surface is opened. Grouting structure and its grouting method. Background technique [0002] Concrete dam is one of the two most widely used dam types in the world. During the construction and operation of concrete dams, there are many aspects that need to be paid enough attention to by engineering construction or management personnel, among which anti-seepage and dam anti-sliding stability are two of the key points. As the name implies, concrete dams use concrete as the main dam building material. However, due to the shrinkage characteristics of concrete materials, the contact surface betwee...

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Problems solved by technology

[0004] What the present invention aims to solve is that the existing concrete dam is easy to open due to concrete shrinkage at the foundation surface of the steep slope, and there is a possibility of repeated opening after contact grouting. The conventional contact grouting design method currently used can only meet To solve the problem of one-time contact grouting, provide a concrete dam steep slope foundation surface repeated contact grouting structure and a grouting method that can perform repeated grouting when the contact surface between the concrete dam and the foundation surface is opened

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