Other

Wirth Maschinen-und Bohrgerate-fabrik Gmbh

Master Drilling South Africa (pty) Ltd.

Master Sinkers Ltd

Nikolaus Kleuters

Barend Jacobus Jordaan

Nicolaas Bodenstein Goodwin

Daniel Coenraad Pretorius

Louis Germishuys

Gareth Robert Sheppard

A shaft enlargement arrangement for a boring system is provided, the shaft enlargement arrangement comprising a hollow column proximate a lower end of the boring system; a first cutter head that is rotatably fitted to the hollow column, with first drive means being provided to rotate the first cutter head relative to the hollow column so as to bore downwardly a hole having a diameter corresponding substantially to the diameter of the first cutter head; and a boring head arrangement fitted to an operatively lower end of the column, the boring head arrangement terminating in a second cutter head to bore a leading hole as the boring system proceeds to bore downwardly. In an embodiment, the first cutter head comprises a support body carrying a winged arrangement, the support body being rotatably fitted to the column, the winged arrangement comprising a plurality of wings extending from the support body, each wing being fitted with, or comprising, a plurality of first cutter elements.

Shaft enlargement arrangement for a boring system

The tunnel rock drill ( ) for driving a tunnel bore optionally in open or shielded mode comprises a shield tail ( ), which is connected to the drill head ( ) and which covers optionally the bore wall over a defined length; a bracing device ( ), which can be optionally fixed in the tunnel bore; at least one optionally activaatable advancement device ( ), which, on the one hand, rests on the bracing device ( ) and , on the other hand, acts on the drill head ( ); and an optionally activatable force generator ( ), which has a variable length and which, on the one hand, rests on a tubbing support ( ) and, on the other hand, acts on the drill head ( ). To introduce the advancement forces into the drill head in open mode, there is an inner kelly ( ), which can be moved in the direction of boring in relation to the bracing device ( ) and to which the advancement generator ( ) is hinged and whose breast-sided end bears the drill head ( ).

Tunnel-boring machine and method of using the same

An apparatus for producing an upwardly directed drill hole with feed cylinders and a clamping cylinders contains a pressure medium system with a pump, a supply duct and a control valve. In order to attain a particularly favorable and simple design, a second pump is provided, for feeding a second supply duct, from which at least one branch duct containing a choke or the like leads to the drilling head or its tools. The control valve is provided between the first pump and the first supply duct for one set of sides of the clamping and feed cylinders.

Apparatus for producing an upwardly directed drill hole

Growing community of inventors

Geilenkirchen, Germany

Nikolaus Kleuters