Drilling and jetting integrated foundation treatment bottomhole assembly
A foundation treatment, drilling and spraying technology, applied in the direction of drill pipe, drill pipe, drilling equipment, etc., can solve the problems of forming soil blocks and affecting the strength of cement-soil curtain
Active Publication Date: 2013-04-17
安徽水利开发有限公司
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Problems solved by technology
[0004] Because the above-mentioned drilling tool assembly has only a single jet hole, there is a cutting blind area when cutting the formation, and during the spraying operation, the high-pressure air injected from the jet hole needs to stir the cement slurry and the cut soil layer to form a mixed slurry. It is difficult for the existing drilling tool assembly to fully force the cement slurry in the borehole to mix with the soil layer, and soil blocks are often formed in the borehole, which affects the strength of the cement-soil curtain
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[0016] Such as Figure 1-3 As shown, the drilling tool assembly includes a drill bit 2 and a drill pipe 1. The cross-sectional shape of the drill pipe 1 is square, and the drill pipe 1 contains two separate conveying pipes. The feed pipe 12 of water or high-pressure cement slurry, the radial direction of the side wall of the lower part of the drill pipe 1 has a spray hole 12a, and the feed pipe 12 communicates with the spray hole 12a;
[0017] The air pipe 11 in the drill pipe 1 has a diameter of 31mm. The lower part of the drill pipe 1 has a square pressure equalization chamber 13 with a cross-sectional shape corresponding to the cross section of the drill pipe 1. The air pipe 11 communicates with the pressure equalization chamber 13. On the four side walls of the pressure equalization chamber 13 There are twelve air injection holes 11a, the axial direction of the air injection holes 11a is biased towards the bottom of the drill bit 2 with a 45° inclination angle, so that the...
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The invention discloses a drilling and jetting integrated foundation treatment bottomhole assembly. The bottomhole assembly comprises a drill bit and a drill stem, wherein an air pipe and a feed pipe which are separated from each other are arranged in the drill stem, the feed pipe is communicated with a jetting hole in the side wall of the lower part of the drill stem, the lower end of the drill stem is fixedly connected with the drill bit, a pressure equalizing chamber is arranged in the lower part of the drill stem and is communicated with the air pipe, and more than two gas orifices communicated with the outer side of the drill stem are formed in the side wall of the pressure equalizing chamber. After the bottomhole assembly is adopted, high-pressure air can be used for more fully cutting a soil layer, pressure is more uniform when the high-pressure air is jetted, and soil and cement grout can be fully mixed in a forced manner.
Description
technical field [0001] The invention relates to a drilling tool assembly, in particular to a drill tool assembly integrating drilling and spraying for foundation treatment. Background technique [0002] At present, the anti-seepage and reinforcement treatment method of geotechnical engineering is drilling and spraying integrated high-pressure jet grouting, a reciprocating high-pressure jet grouting foundation anti-seepage reinforcement method, which integrates drilling and high-pressure spraying, and installs water or slurry and high-pressure gas in the drill pipe. The injection pipeline is equipped with conveying slurry, water and air and lifting equipment. The walking trolley integrated with drilling and irrigation is moved to the drilling position for drilling construction. During drilling, the high-pressure mud pump delivers high-pressure medium, and the air compressor is turned on when necessary Conveying high-pressure gas, the high-pressure medium sprays the original s...
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IPC IPC(8): E02D15/04E02D19/16E21B17/18
Inventor 张绍虎徐少华董传明滕浙良白彦平叶飞
Owner 安徽水利开发有限公司