Chambering drilling machine

Abstract

A chambering drilling machine comprises chambering drilling tools, an expanding cutting wing, a second cutting wing, a protection frame, a guide frame, hollow polished drilling rods, multiple sets of stirring blades and wear-resisting plates. The second cutting wing is in a double-head type and is arranged on the outer wall of a hollow pipe in the mode of surrounding the hollow pipe in a radial mode, and an included angle of a certain degree is formed in the radial direction. The wear-resisting plates are fixedly mounted on the free end arc faces, coaxial with the hollow pipe, of the stirring blades, the expanding cutting wing and the second cutting wing; a second wing sheet forms an included angle of a certain degree in the radial direction of a drilling tool pipe; the left chambering drilling tool, the right chambering drilling tool and the hollow polished drilling rods are sleeved with the protection frame and the guide frame; an expanding cutter and a second cutting cutter are made from hard alloy blocks. The chambering drilling machine has the advantages that chamfering is easy and convenient, the cutting cutter is high in strength, a spiral sheet is high in wear resistance, drilling and excavating capacity is high, and stirring is full, and drilling and excavating efficiency and construction quality are effectively improved.

Description

technical field [0001] The invention relates to a drilling rig, in particular to a reaming drilling rig for foundation construction. Background technique [0002] With the development of high-rise buildings, large bridges and urban subway infrastructure projects, the construction of mixing piles has the advantages of simple equipment, no vibration, no noise, no lateral extrusion of the surrounding soil, short construction period and low project cost. The long spiral equal-diameter pile drilling rig is widely used, and the equal-diameter pile is limited due to poor bearing capacity, and a large number of new bearing piles such as various bottom expansion piles and gourd piles are also used in foundation engineering construction. At present, the reaming drilling rig generally adopts two types of mechanical reaming and hydraulic reaming. The mechanical reaming drill works by opening the reaming wing with the help of gravity when the drill pipe is lowered, and retracting it by i...

AI Technical Summary

Problems solved by technology

At present, the reaming drilling rig generally adopts two types of mechanical reaming and hydraulic reaming. The mechanical reaming drill works by opening the reaming wing with the help of gravity when the drill pipe is lowered, and retracting it by itself with the help of the lever principle when it is lifted. This type of reaming drill has the problem that the reaming size cannot be guaranteed; while the hydraulic reaming drill uses a hydraulic expansion cylinder for reaming and retracting, and the expansion cylinder it uses is generally arranged on the outer wall of the drill pipe or the inner cavity of the drill pipe. When the expansion cylinder is eroded by compressed air, mud and other substances, the processing accuracy and sealing performance of the expansion cylinder are very high, and the manufacturing and assembly are difficult. The failure of the seal during use is likely to cause hydraulic system failure. During the drilling process, the expansion arm needs to be opened in time for the reaming operation, and it is often impossible to operate as required.

[0003] In the construction of high-rise buildings, large bridges and urban subway infrastructure projects, it is often encountered that the ground is not uniform in softness and hardness, and sand and gravel are mixed. The reaming drilling tool bears greater drilling and stirring resistance, resulting in serious quality problems such as severe wear of the cutting edge of the drilling tool, serious blade wear and uneven mixing, which greatly reduces the operating efficiency and seriously affects the overall strength of the improved reinforced body

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