Arrangement for a down-the-hole hammer drill for use in soil consolidation through jet grouting
An arrangement for a down-the-hole hammer drill, for use in soil consolidation by jet grouting, and comprising a cylindrical machine housing, an impact mechanism driven by pressurised fluid that impacts onto a drill bit mounted in a chuck in the machine housing that allows reciprocating motion, whereby the machine housing has a central supply line for the driving fluid to the impact mechanism in which channels in the drill bit constitute outlets for used driving fluid. The machine housing is provided with a grouting nozzle for jet grouting, that the grouting nozzle is directed in a sideways direction and arranged at the periphery of the wall of the machine housing, that a rinsing channel for conducting a grouting mixture through the machine housing to the said grouting nozzle is arranged whereby the rinsing channel for the grouting mixture is separate from the supply line for the driving fluid of the impact mechanism.
1. An arrangement for a down-the-hole hammer drill, for use in soil consolidation jet grouting, the arrangement comprising:
a cylindrical machine housing of a down-the-hole hammer,
an impact mechanism driven by pressurised fluid that, mounted in the machine housing, is arranged to give impacts onto a drill bit fixed mounted in a chuck in the machine housing in a manner that allows reciprocating motion,
a central supply line for supplying driving fluid to the impact mechanism in which channels in the drill bit constitute outlets for used driving fluid,
a grouting nozzle for jet grouting,
a rinsing channel for conducting a grouting mixture through the machine housing to the said grouting nozzle and being separate from the supply line for the driving fluid of the impact mechanism,
wherein the grouting nozzle for jet grouting is directed in a sideways direction and so arranged at the periphery of a wall of the machine housing of the down-the-hole hammer that the grouting mixture delivered is directed radially outwards from the machine housing of the down-the-hole hammer,
wherein the rinsing channel extends linearly in the axial direction of the hammer and is designed as an integral part of the wall of the machine housing,
wherein the rinsing channel comprises a number of subchannels evenly distributed around the circumference of the machine housing,
wherein the subchannels are connected to a single ring-shaped compartment that is connected to the grouting nozzle.
2. The arrangement according to claim 1 , whereby the grouting nozzle is located at the forward end of the cylindrical machine housing.
3. The arrangement according to claim 1 , whereby each subchannel is designed as a longitudinal depression in the form of a track that has been formed in at least one of the opposing surfaces of two pipes, one of which is positioned inside of the other and which together form the machine housing.
4. The arrangement according to claim 3 , whereby the pipes, one of which is located inside of the other, are joined by means of welding or by shrink-fitting of the outer tube onto the inner.