Improved structure of full casing spiral drilling machine and full casing threaded filling pile construction method

Abstract

The invention discloses an improved structure of a full casing spiral drilling machine and a full casing threaded filling pile construction method. The improved structure of the full casing spiral drilling machine includes a double power head spiral drilling machine (2). A casing (1) is mounted on the double power head spiral drilling machine (2). A lower power head (4) capable of making the sleeve tube rotate is detachably mounted on the casing. An upper power head (5) is arranged above the lower power head. A spiral drilling rod (6) capable of moving up and down in the casing is detachably connected to the upper power head. A drilling device capable of moving in the casing is connected to the lower end of the spiral drilling rod. A spiral member (3) is integrally formed on at least a part of the outer wall of the casing, wherein the spiral direction of the spiral member is opposite to that of the spiral drilling rod. The drilling machine improvement is simple and durable. the full casing spiral drilling machine with the structure and the construction method of the invention can be used to form threaded piles with medium and large diameter under conventional mechanical equipment dynamic conditions, and so threaded special-shaped piles are more in line with increasing demand of pile bearing capacity for structures at a current stage.

Description

technical field [0001] The invention relates to an improved structure and a construction method of a pile, in particular to an improved structure of a full casing auger drilling machine and a construction method of a full casing threaded cast-in-place pile, belonging to the technical field of construction engineering. Background technique [0002] With the development of society, land resources are scarce, and buildings are gradually developing to high-rise buildings. The load of buildings and structures is increasing, so that pile types with higher bearing capacity, pile-forming methods and pile-forming machinery are widely used in foundation engineering, among which various threaded cast-in-situ piles with medium diameters and large-diameter cast-in-place piles are widely used in foundation engineering. The application is particularly extensive. [0003] The research on threaded cast-in-situ piles in our country was carried out in the 1990s, and a variety of pile types an...

AI Technical Summary

Problems solved by technology

Although the existing full-sleeve rotary drilling machine and pile-forming method overcome many difficulties in the construction of large-diameter cast-in-place piles, the large-diameter cast-in-place piles formed are all straight-line cast-in-situ piles with equal cross-sections, and it is impossible to form concrete through the pile body. The screw tooth improves the measured resistance of the cast-in-place pile, and it is impossible to re-expand holes in the hard soil layer and rock layer at the bottom of the pile. By increasing the area of ​​the pile bottom, the resistance at the end of the cast-in-place pile is increased, thereby further improving the vertical bearing capacity of the cast-in-place pile.

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