Deep and thick sand layer covered karst cave grouting system device and construction method

Abstract

The invention discloses a deep and thick sand layer covered karst cave grouting system device and grouting construction method. According to the system device, a cement tank (1), a slurrymaking system (2) and a grouting machine (9) are connected through slurry inlet pipelines (3), and are connected with a slurry recovery system through slurry return pipelines (7); a grouting system comprises a grouting recorder (5) and a slurry stop plug (6), the grouting recorder (5) is connected with flowmeters (4) and a pressure meter (11), the slurry stop plug (6) is placed on a top plate of a karst cave (8), and a grouting needle pipe is arranged in the slurry stop plug (6). The grouting construction method comprises the steps that 1, the cement tank, the slurrymaking system and the slurry recovery system are mounted; 2, drilling construction is carried out on an outer sleeve pipe till the outer sleeve pipe is close to a bed rock face as much as possible; 3, an inner steel sleeve pipe drills into bed rock by at least 0.5 m; 4, the bed rock is drilled to design depth; 5, the grouting system is mounted; and 6, cement slurry is pressed into the karst cave, grouting is stopped after the final slurry standard is met, and hole sealing is carried out.

Description

technical field [0001] The invention relates to a grouting construction equipment and a grouting construction method for karst caves under geological conditions of sand layers. Background technique [0002] At present, the grouting in the karst area usually adopts the construction technology of directly grouting the drill pipe or pulling out the drill pipe to inject grouting and sealing the hole with a disposable plastic pipe after the hole is formed. However, under the geological conditions where the karst limestone is directly covered with a deep sand layer, the sand layer and the karst cave can be connected after the hole is formed using this method. During the construction process, a series of construction parameters and indicators such as slurry feeding, return slurry, and pressure cannot be monitored to determine whether the final slurry standard is met, and it is impossible to determine whether the karst cave has been effectively filled, and karst collapse is prone to...

AI Technical Summary

Problems solved by technology

However, under the geological conditions where the karst limestone is directly covered with a deep sand layer, the sand layer and the karst cave can be connected after the hole is formed using this method. During the construction process, a series of construction parameters and indicators such as slurry feeding, return slurry, and pressure cannot be monitored to determine whether the final slurry standard is met, and it is impossible to determine whether the karst cave has been effectively filled, and karst collapse is prone to occur, resulting in personnel and property losses , and even cause great social impact

[0003] Therefore, in order to avoid the above problems, it is necessary to optimize the grouting system and construction technology on the basis of traditional construction, and provide a karst grouting system and construction method under deep sand coverage. This method not only avoids the loss of sand and gravel, At the same time, it solves the problems of insufficient and excessive grouting, and eliminates the risks of traditional techniques in this stratum.

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