Squeezing and expanding device of rotary drilling rig for piling and forming

Abstract

The invention discloses a squeezing and expanding device of a rotary drilling rig for piling and forming. The squeezing and expanding device comprises a drilling rod, a squeezing and expanding support arm mechanism arranged at the bottom end of the drilling rod and a hydraulic system driving the squeezing and expanding support arm mechanism; the hydraulic system comprises a squeezing and expanding oil cylinder; the squeezing and expanding oil cylinder comprises a vertically-arranged cylinder barrel and an oil cylinder piston rod arranged in the cylinder barrel; an upper supporting seat sleeves the cylinder barrel; the squeezing and expanding support arm mechanism comprises an upper squeezing and expanding arm and a lower squeezing and expanding arm which are identical in length; the lower end of the upper squeezing and expanding arm is hinged to the upper end of the lower squeezing and expanding arm; the upper end of the upper squeezing and expanding arm is connected with the upper supporting seat; the lower end of the lower squeezing and expanding arm is connected with the oil cylinder piston rod; the upper supporting seat and the oil cylinder piston rod move along the axial direction of the cylinder barrel in a facing form or a deviating form, so that the squeezing and expanding support arm mechanism correspondingly expands or shrinks; in addition, the heights of hinging pivots of the upper squeezing and expanding arm and the lower squeezing and expanding arm are unchanged. After a pile disc-shaped cavity of a squeezing and expanding resistant plate is formed, specified section requirements are met, and a pile hole is good in squeezing and expanding shape.

Description

technical field [0001] The invention belongs to the technical field of building construction, and in particular relates to a rotary drilling rig extrusion device for forming piles. Background technique [0002] In construction engineering, the pile foundation is a deep foundation that is composed of piles and caps connected to the top of the pile and bears static and dynamic loads. Pile foundations are widely used in many high-rise buildings, industrial plants, key projects, bridges and docks. According to incomplete statistics, the engineering volume of the pile foundation accounts for about 25% to 30% of the foundation engineering volume. The construction process of the traditional pile foundation is drilling → hole cleaning → aperture detection → lowering the reinforcement cage → pouring concrete. This construction method is relatively simple , strong adaptability, but the bearing capacity is limited, the cost is high, the amount of steel and cement is large, the empty s...

AI Technical Summary

Problems solved by technology

[0005] The main purpose of the present invention is to provide a rotary drilling rig extrusion device for piling forming, aiming at solving the problems of complicated hydraulic structure and low control precision of existing rotary drilling rigs

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