Slurry replacement device for retarded cement slurry in freezing method construction

Abstract

The invention discloses a mud replacement device by long-setting liquid cement during the freezing method construction. The mud replacement device by long-setting liquid cement comprises a liquid cement delivery pump, a motor, a high-pressure liquid cement pipeline, a liquid cement pool and a liquid cement filtration mechanism, and the mud replacement device further comprises a liquid cement delivery pipe, a drill hole wall scrapping and finishing mechanism, an ejecting mechanism and a positioning mechanism; the drill hole wall scrapping and finishing mechanism is positioned in the liquid cement delivery pipe; the ejecting mechanism is in drive connection with the drill hole wall scrapping and finishing mechanism, and pushes the drill hole wall scrapping and finishing mechanism out from the bottom end of the liquid cement delivery pipe; the positioning mechanism is used for keeping the drill hole wall scrapping and finishing mechanism not to displace along the axial direction of the liquid cement delivery pipe after the drill hole wall scrapping and finishing mechanism is pushed out from the bottom end of the liquid cement delivery pipe. Mud on the drill hole wall can be removed; a clearance is not generated between surrounding rock and an annular filling space after frozen walls are unfrozen after the termination of the freezing period; water containing stratums are prevented from conveying a great deal of groundwater to positions such as ingates and lanes; mine flooding accidents are reduced.

Description

technical field [0001] The invention relates to the technical field of freezing construction, in particular to a device for replacing mud with retarded cement slurry in freezing construction. Background technique [0002] In the frozen construction in the prior art, in order to avoid the water conduction problem in the annular space between the frozen pipe and the surrounding rock, the mud in the borehole is usually replaced by retarded cement slurry. Chinese patent documents CN101225740A and CN102536248A both disclose the method of using retarded cement slurry to replace the mud in the borehole. Although the replacement method in the prior art can successfully replace the mud in the borehole, but for A layer of dense mud skin can do nothing. After the freezing period is over and the frozen wall is thawed, the dense mud skin attached to the borehole wall will form a gap between the surrounding rock and the annular filling space, through which the aquiferous formation may tr...

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Problems solved by technology

Chinese patent documents CN101225740A and CN102536248A both disclose the method of using retarded cement slurry to replace the mud in the borehole, although the replacement method in the prior art can well replace the mud in the borehole smoothly, but for A layer of dense mud skin but powerless

After the freezing period ends and the frozen wall is thawed, the dense mud skin attached to the borehole wall will form a gap between the surrounding rock and the annular filling space, through which the aquiferous formation may transport a large amount of groundwater to the Matoumen or the roadway, etc. Well flooding accidents may occur

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