A Construction Method of Rotary Digging Pile in Hard Rock Formation with Large Dip Angle

Abstract

The invention discloses a large-dip-angle hard rock stratum rotary excavating pile construction method. The method comprises the following steps that firstly, a site is leveled; secondly, a pile station is measured and put, and the pile station measuring and putting work in the site is conducted well according to the coordinates of a control point and an elevation point; thirdly, a rotary drilling machine is arranged in place; fourthly, a pile casing is buried, whether the pile station and the center station of the pile casing are consistent or not is checked, and after correcting is completed, soil filling and ramming are conducted surrounding the pile casing; fifthly, rotary excavating and drilling are carried out to form a hole; sixthly, the hole is cleaned, and the diameter and the depth of the hole are measured; seventhly, a reinforcement cage is put into the hole; eighthly, a guide pipe used for secondary hole cleaning is installed in the hole; and ninthly, concrete pouring and pile foundation testing are carried out, wherein in the fifth step of rotary excavating and drilling for the hole, when a large-dip-angle hard rock stratum is drilled, a rock-socket long-cylinder drill with an alloy drill bit is selected, low-gear drilling is carried out when the drill makes contact with a rock face, an operation rod is stabilized without shaking, the drill bit slowly enters the rock stratum, and after the perpendicular distance drilled by the drill bit is not smaller than 200 mm, the gear is changed, and normal drilling is carried out.

Description

technical field [0001] The invention belongs to the field of construction, relates to a construction method, and in particular relates to a construction method for a rotary excavation pile in a hard rock layer with a large dip angle. Background technique [0002] The development of rotary drilling rigs has a history of decades in the world. With the environmental protection action vigorously advocated by my country, rotary drilling rig construction has only been gradually recognized and applied in recent years, first in the construction of roads, bridges and high-speed railways. It has been widely used, and was gradually promoted and applied to the housing construction market. It has become a new type of pile hole construction method that has developed the fastest in recent years. Because of its flexible movement, high work efficiency, good construction quality and less mud pollution, rotary excavation Bored pile construction technology is known as "green construction technolo...

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Problems solved by technology

[0003] The hard rock formation with a large dip angle is characterized by hardness and a large inclination angle. The current construction method is very prone to drilling inclination, resulting in low construction efficiency, high cost, and poor quality.

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