Reverse circulation pneumatic down-the-hole hammer rotary drilling rig and its construction method

Abstract

The invention discloses a rotary drilling machine for a reverse-circulation pneumatic down hole hammer and a construction method for the rotary drilling machine. The rotary drilling machine comprises a chassis and a mast arranged on the chassis, wherein a reverse-circulation power head is mounted on a guide rail of the mast; the upper part of the reverse-circulation power head is provided with a water faucet; the water faucet is connected with a slag discharge tube; the lower part of the reverse-circulation power head is provided with a buffer; the buffer is connected with a gas box; the gas box is connected with a gas inlet rubber tube; the lower end of the gas box is connected with a drill stem; and the lower end of the drill stem is connected to the reverse-circulation pneumatic down hole hammer and a drill bit. The rotary drilling machine has the function of constructing the reverse-circulation pneumatic down hole hammer, can realize high-efficiency rock-entering, also can effectively protect hole walls, needs small drilling pressure and small rotary torque, can continuously take a core and can effectively solve orifice dust pollution.

Description

technical field [0001] The invention relates to the fields of engineering machinery and pile foundation construction, in particular to a reverse circulation pneumatic down-the-hole hammer rotary drilling rig and a construction method thereof. Background technique [0002] The structure of current prior art rotary drilling rig is as follows: figure 1 As shown, including the chassis (1), the mast (5) installed on the chassis (1), the power head (4) is installed on the guide rail of the mast (5), and the winch arranged on the chassis (1) is connected by a wire rope. Drilling rod (3) and drilling bucket (2), telescopic drilling rod (3) are machine lock type (or friction resistance type) drilling rod. [0003] The rotary drilling rigs of the prior art are difficult to drill in hard rocks (rocks with a uniaxial compressive strength greater than 100MPa). Although there are examples of rotary drilling rigs using roller cone drill bits to drill into slightly weathered rocks, there a...

AI Technical Summary

Problems solved by technology

When the down-the-hole hammer is drilling in positive circulation, the high-speed airflow scours the hole wall, which is not conducive to the stability of the hole wall

The exhaust gas discharges the powdery rock slag, and the dust is diffuse, which affects the construction and easily causes environmental pollution

When the diameter of the borehole is large, the air volume driving the DTH hammer is less than the air volume required for slag discharge, resulting in difficulty in slag discharge

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