Automatic reducing pore-forming device mounted on drilling machine

Abstract

The invention discloses an automatic reducing pore-forming device mounted on a drilling machine. The automatic reducing pore-forming device comprises a pile pipe, a guide rod, movable boards and an inverted conical pile tip, the guide rod is movably connected to the lower portion of the pile pipe, the lower end of the guide rod is fixedly connected with the pile tip, 3-6 movable boards are hinged to the edge of the upper end face of the pile tip and arranged side by side, a 5-6cm distance is reserved between every two adjacent movable boards, the movable boards are arc-shaped and are closed and tightly hold the pile pipe when pores are formed, and the diameter a of the upper end face of the pile tip is not larger than the diameter A of the pile pipe. The automatic reducing pore-forming device is simple, convenient to operate, low in lifting resistance and high in pore-forming speed, and labor productivity is greatly improved. The pore-forming process can be widely applied to construction of foundations such as civil and industrial building foundations, railways, roads, bridges and harbors.

Description

technical field [0001] The invention relates to an automatic variable-diameter hole forming device installed on a drilling machine. Background technique [0002] The bottom of the current hole former is conical. During the hole forming process by non-rotary drilling methods such as driving in or pressing in, the soil around the hole former is squeezed. When the hole former is lifted, the hole former and the soil The friction resistance between them is very large, and it often requires a large pulling force to lift the hole forming device out of the hole. The power of the equipment that needs to be lifted is often large, and the equipment purchase cost is relatively high, and the consumption of oil and other materials during the construction process will also be greatly increased. increase, so that the overall construction cost is relatively high. There are also many unsafe factors in too large a pulling force simultaneously. Contents of the invention [0003] The technic...

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Problems solved by technology

[0002] The bottom of the current hole former is conical. During the hole forming process by non-rotary drilling methods such as driving in or pressing in, the soil around the hole former is squeezed. When the hole former is lifted, the hole former and the soil The friction resistance between them is very large, and a large pulling force is often required to lift the hole forming device out of the hole. The power of the equipment that needs to be lifted is often large, and the equipment purchase cost is relatively high, and the consumption of oil and other materials during the construction process will also be greatly increased. increase, so that the overall construction cost is relatively high

At the same time, there are many unsafe factors in too large pulling force.

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