| 摘要 |
<P>PROBLEM TO BE SOLVED: To solve the problem that pumping energy is exhausted and attenuated by a turbulent flow generated in a bent portion, because a pumped ground hardening material is almost perpendicularly bent at a nozzle portion, on the grounds that a jet nozzle for emitting the jet of ground hardening material by high pressure is conventionally set in a side wall of an injection rod. Ž<P>SOLUTION: A swirling flow guiding structure 3 is formed in a predetermined portion of a central core channel 12 which communicates with a core nozzle 21 of the injection rod; a plurality of branch channels are provided; and a terminal end of the central core channel is constituted in a swelling curved shape 32. Thus, a pumped material is guided in a swirling manner to the branch channels by splitting a pumped jet flow by curved surface butting, so as to generate the swirling flow causing only a small energy loss. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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