Diameter variable double high-pressure stir-spray pile and diameter variable method thereof
A technique of mixing and spraying piles and double high pressure, which is applied in the direction of drilling equipment and methods, sheet pile walls, earthwork drilling and mining, etc., which can solve the problems of increasing the difficulty of on-site operation and adjustment, unfavorable stability of the connection structure of mixing and spraying piles, time-consuming and laborious and other problems, to achieve the effect of stable connection structure between the drill bit and the drill pipe, simple and easy operation of variable diameter, and guaranteed work efficiency
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[0038] Example 1, such as Figure 1 to Figure 7 As shown, the variable-diameter dual high-pressure jet mixing pile includes:
[0039] Drill rod 1 and drill bit 2 connected to the end of drill rod 1;
[0040] The high-pressure pump 6 externally connects and delivers compressed air and cement slurry to the high-pressure air pipe 11 and the high-pressure cement slurry pipe 12. The high-pressure air pipe 11 and the high-pressure cement slurry pipe 12 inside the drill pipe 1 and the drill bit 2 are connected;
[0041] The drill bit 2 has an outer sleeve 21 connected to the drill rod 1, and the connection method can be welding, plug-in or bolt connection; a terminal 22 is connected to the end of the outer sleeve 21;
[0042] A fixed base 23 for the high-pressure air pipe 11 and the high-pressure cement slurry pipe 12 to penetrate is provided inside the outer sleeve 21, and a hydraulic rod 51 is installed on the fixed base 23, and the hydraulic rod 51 drives and connects the piston 52;
[004...
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