Method for rapidly forming hole by using rotary drilling rig to penetrate through drift sand layer

Abstract

The invention discloses a method for rapidly forming a hole by using a rotary drilling rig to penetrate through a drift sand layer. The method comprises the following steps of: (1) preparation of chemical polymer slurry; (2) shield-tube burying; (3) drilling for hole formation; (4) reinforcement cage lifting and lowering; (5) secondary hole cleaning; and (6) underwater concrete pouring. In the chemical polymer slurry preparing process, water used as a raw material is clean tap water; the pH value of the water source is tested by using pH test paper before the water is used; a small amount of dietary alkali is added according to a testing result; and the pH value of a slurry system is adjusted to be 9-10; 2-3% of chemical polymer is added to water with pH value of 9-10 to prepare an aqueous solution with mass concentration of 0.1-0.5%. The relative density of the slurry is 1.15-1.18, the viscosity of the slurry is 17-20 and the sand content of the slurry is not more than 3%; and before concrete casting, the relative density of the slurry is 1.03-1.1, the viscosity of the slurry is 18-19 and the sand content of the slurry is not more than 0.5%. The polymer slurry boring mud has the advantages of rapidness for precipitation and less sediment.

Description

technical field [0001] The invention relates to a method for quickly forming a hole through a quicksand layer by a rotary drilling drill. Background technique [0002] Due to the successive start of national key projects and the tight construction period, the hole-forming speed and hole-forming quality of the pile foundation need to be continuously improved. In the field of construction, bentonite mud is traditionally used for wall protection. Bentonite mineral mud takes a long time to make slurry, the strength of the hole wall is low, and the sedimentation speed is slow. During the drilling process, buried drills, buried rods, and hole wall collapses are prone to occur, resulting in a large waste of rework. , it is difficult to meet the construction and production requirements. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a method for quickly forming a hole through a quicksand layer with a rotary drilling dr...

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a method for quickly forming a hole through a quicksand layer with a rotary drilling drill, so as to overcome the long time for making the bentonite mineral mud, the low strength of the hole wall, and the slow sedimentation speed in the prior art. During the drilling process, buried drilling, buried rods, and hole wall collapse are prone to occur, resulting in a large waste of rework and difficulty in meeting construction and production requirements.