Head for injecting a fluid under pressure to break up ground...

Details Head for injecting a fluid under pressure to break up ground... Head for injecting a fluid under pressure to break up ground...

2006-02-21

2006-02-21

Tsay, Frank S. (Department: 3672)

Boring or penetrating the earth

Miscellaneous

C175S067000

Reexamination Certificate

active

07000714

ABSTRACT:
The present invention provides a head for injecting a fluid under pressure for breaking up the ground from a borehole and mounted at the end of a string of rods. The body of the drilling head has a bottom wall for mounting a mechanical drilling tool having a feed pipe, at least one injection nozzle, and duct-forming means for connecting the feed pipe with liquid at the inlet of said nozzle, the duct-forming means presenting a mean line having a radius of curvature that varies continuously, the right section of said duct-forming means decreasing regularly over at least half its length from its first end towards its second end. The injection head further comprises at least one pipe for feeding said mechanical tool, said pipe being connected at a first end to said duct-forming means and at a second end to a chamber disposed at the bottom end of said injection head and fitted with a controllable shutter member interposed between said chamber and the pipe for feeding said mechanical tool.

REFERENCES:
patent: 4534427 (1985-08-01), Wang et al.
patent: 4930586 (1990-06-01), Turin et al.
patent: 5228809 (1993-07-01), Yoshida et al.
patent: 5787998 (1998-08-01), O'Hanlon et al.
patent: 299 16 060 (2000-04-01), None
Patent Abstracts of Japan vol. 10, No. 216, & JP 61 053912. Method of Improving Ground by Building Columnar Curing Wall. Mar. 18, 1986.

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