Impact Ramming

THIS TECHNIQUE ENABLES INSTALLATION OF OPEN STEEL PIPES WITH THE USE OF SPECIAL PNEUMATIC RAMMING MACHINES WHICH APPLY IMPULSIVE STRESS.

When propulsion begins, the pneumatic ram is sited at the back end of the excavation and is self-supported by stretchers that connect it to the pipe.

No hydraulic jacks or any structure providing a reaction to them are required.

During drilling spoil accumulates in the pipe, from which it is removed at the end of the installation by water flush, compressed air or auger.
DRILLING OPERATIONS

1) construction of a suitable thrust chamber for the type of pipe to be used, at the design depth;

2) installation of the first segment in correspondence with the design axis. In very hard soils, the pipe front end is reinforced suitably to ease propulsion;

3) construction of the line by pipe ramming; joining and/or welding of male-female joints. The pipe back end, to which the ram is applied, is equipped with a thrust ring.

4) Recover of the steel cutting head and spoil removal at the exit.

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