High-flow high-speed jet plugging grouting technique under high-pressure water head of hydropower station

Abstract

The invention relates to a high-flow high-speed jet plugging grouting technique under a high-pressure water head of a hydropower station. For water permeability and water seepage of flow guide holes under pressure of the high water head of 50m to 130m, the technique adopts a 'high-flow high-speed jet plugging drilling orifice safety control device under the high-pressure water head' and a 'high-pressure-resisting water-returning safety control device in a drilling rod under the high-pressure water head' which integrate multiple functions of water stopping in the drilling rod, water drainage, pressure relieving, orifice closing, safe drilling construction and the like, solves the construction of safe drilling and grouting under the working condition of water burst of the high water head inthe orifice and completes plugging under the condition of the high water head, which is a difficulty without being recorded in world hydropower engineering construction. The high-flow high-speed jet plugging grouting technique reduces direct and indirect economic losses of over ** and has good economic benefit, simultaneously creates a new way for the plugging difficulties of water permeability and water seepage of flow guide holes under pressure of the high water head of 130m of the hydropower station in China.

Description

technical field [0001] The invention belongs to the technical field of water conservancy and hydropower engineering, and in particular relates to a construction technology for effectively plugging and grouting the large-flow and high-speed jets in a hydraulic cavern under a high-pressure water head. Background technique [0002] During the construction of water conservancy and hydropower projects, during the excavation and blasting construction of the caverns in the key lines of each project, there will be engineering conditions such as rapid rise of groundwater level and excessive rise of water head pressure, which often cause sudden water seepage and water gushing. Accompanied by working conditions such as landslides, subsidence, large-scale water seepage, and large-flow high-speed jets, it is extremely difficult to handle and is a high-risk operation, which has a great impact on the construction progress of key lines during construction and the safety of construction perso...

AI Technical Summary

Problems solved by technology

The preliminary treatment measures are conventional treatment methods. The results show that the treatment of the high-speed jet permeation accident caused by the permanent plugging of the diversion tunnel under the 130m high water head cannot be completed by conventional methods. Conventional methods can only control water leakage within a certain period of time. Seepage does not expand rapidly

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