Hole deviation control method for drilling in deep hole curtain grouting

Abstract

Disclosed is a hole deviation control method for drilling in deep hole curtain grouting. Before spud-in, four corners of a rig substructure is anchored by expansion bolts, the rig abdomen is fixed by a draw bar, so that the rig body can be guaranteed to be stable during the drilling process; during the drilling, a long drilling tool is used for core drilling for the construction within 2 / 3 of the hole depth of the drill hole along with the gradual increase of the hole depth, and the drill hole deviation within 2 / 3 of the hole depth is controlled to be within 1 / 2 of a designed permissible value; and under 2 / 3 of the hole depth, a three-wing clad sheet or a diamond roller bit is used for drilling on the whole section without coring, and the accurate drill hole drilled on the upper portion is used as a guide to finish the drilling. According to the method, the long drilling tool is used for drilling the upper portion of the drill hole, the accurate drill hole drilled on the upper portion is used as a guide for the lower portion, the three-wing clad sheet or the diamond roller bit is used for drilling on the whole section without coring, so that an offset distance at the bottom of the drill hole is not larger than 2.0m.

Description

Technical field

[0001] The invention relates to the construction field of curtain grouting for hydraulic buildings, in particular to a method for controlling the inclination of curtain grouting holes with a drilling hole depth of more than 100m. Background technique

[0002] The currently used technical specifications for cement grouting construction of hydraulic buildings (DL / T 5148-2012) have clear requirements for the inclination of curtain grouting holes, "In the construction of multiple rows of holes, the allowable offset of the hole bottom is not more than 2.5m when the hole depth is 100m. , When the hole depth is greater than 100m, the maximum deviation of the hole depth shall be determined according to the actual situation of the project."

[0003] For curtain drilling holes with a hole depth greater than 100m, it is difficult to control the deviation of the hole inclination to no more than 2.0m.

[0004] In fact, the development law of hole deviation is as the hole depth in...

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