Construction method for reducing frost heaving effect borne by derrick foundation
A construction method and basic technology, which is applied in the direction of basic structure engineering, sinking, shaft equipment, etc., can solve the problems of energy loss, large investment, and shrinking the circle diameter of freezing holes, so as to reduce the effect of frost heave and weaken the strength of frost heave Effect
Active Publication Date: 2012-07-11
BEIJING CHINA COAL MINE ENG CO LTD
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AI-Extracted Technical Summary
Problems solved by technology
The invention provides a construction method for reducing frost heaving effect borne by a derrick foundation, which includes the procedures: mixing white polyethers and black esters according to a weight ratio, mixing well and spraying into a middle space of a casing for foaming; using drill bits of different diameters to perform two-stage or multi-stage broaching according to the diameter of the outer wall of an insulation layer of a freezing pipe after freezing borehole boring is complete, and cleaning bottom of a borehole and tripping the pipe after broaching is complete; splitting a hard polyethylene casing from the single side after a weld is cooled naturally, respectively connecting the split casing to insulation segments in an overlap joint manner, and pouring the well mixture of the black and the white materials into a joint binding space for foaming. Polyurethane foam has good thermal insulating property, impact of frost heaving on the derrick foundation can be reduced effectively, and safety and reliability of a permanent derrick are guaranteed.
Protective foundationShaft sinking
EngineeringDrill bit +4
- Experimental program(1)
|Length||40.0 ~ 50.0||cm|
|Length||100.0 ~ 120.0||cm|
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