Dam foundation grouting construction method

Abstract

The invention discloses a dam foundation grouting construction method. The dam foundation grouting construction method particularly comprises the steps that 1, drilling positioning is conducted, grouting holes are measured and positioned on a construction face according to a design drawing and numbered in a unified mode; 2, drilling is conducted, drilling is conducted according to a serial number,and recording needs to be conducted in the drilling process for reference of grouting operation; 3, a grouting pipe is pre-buried, and the pre-buried grouting pipe is positioned in an outer rock-soillayer to be grouted and constructed; 4, hole washing is conducted, after the pre-buried grouting pipe is positioned, the section is washed, and during the hole washing, a method that large-flow waterflow is introduced through a guide pipe, and washing is conducted from the bottom of the hole to the outside of the hole is adopted; 5, pipe feeding is conducted; 6, hole sealing is conducted; 7, grouting is conducted in a floral tube sectional mode, the grouting length of each section is called as a grouting step pitch, and the length of the floral tube is a grouting step pitch length; and 8, pipe retracting is conducted. According to the dam foundation grouting construction method, sediments are cleaned up, grouting is compact, grouting quality is good, and the construction method is simpleand effective, and the construction cost is low.

Description

technical field [0001] The invention relates to the field of building construction, in particular to a dam foundation grouting construction method. Background technique [0002] Concrete high dams are built directly on the rock foundation, and the rock-soil mass of the dam foundation is prone to vertical and horizontal displacements under the combined action of the dam body's own weight and various loads. If the dam foundation is a rock mass with a weak or fractured structure, the rock mass of the dam foundation will often sink vertically due to the compression of pores or cracks in the rock mass. Once subsidence occurs, the stress conditions of the dam body will change, resulting in The dam body is partially unstable or even completely destroyed, so the integrity of the dam foundation is crucial to the safety of the dam body. [0003] When the rock mass of the dam foundation fails to meet the bearing capacity requirements, cast-in-situ piles are often used to improve the b...

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Problems solved by technology

[0003] When the rock mass of the dam foundation fails to meet the bearing capacity requirements, cast-in-situ piles are often used to improve the bearing capacity of the bedrock. It is a common problem for pile foundation concrete not to be dense and void in the construction of cast-in-place piles, especially in underwater cast-in-place piles. There are many occurrences, most of which are local segregation cavities caused by groundwater flow erosion. The main disadvantage of the existing cavity grouting method is that there are more residues left in the on-site grouting holes and holes, and at the same time, the on-site grouting pressure is insufficient, which easily leads to segregation. The cavities cannot be effectively dealt with, and there are still cavities in the local small and uncompacted parts after grouting

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