首页>
外国专利>
A DEVICE FOR DRILLING IN EARTH-LAYERS AND ROCK
A DEVICE FOR DRILLING IN EARTH-LAYERS AND ROCK
展开▼
机译:一种钻探地层和岩石的装置
展开▼
页面导航
摘要
著录项
相似文献
摘要
The invention refers to a device for carrying out drilling in earth-layers and rocks during a simultaneous forcing downwards of a casing pipe (5) into the ground, whereby strokes from a countersink hammer via a bore crown or a guide (3) belonging to a bore crown (1) is provided to cooperate against a shoulder (6) situated at the lower most portion (7) of the casing pipe (5) in driving downwards of the casing pipe (5) into the bore hole made together with the bore crown (1) used. Said shoulder (6) is formed by a wearing ring (10) placed into position against an edge portion (8) within the inner mantle surface (9) of the casing pipe (5) for a direct or indirect cooperation against a shoulder surface (11) faced in a direction to the free end portion (7) of the casing pipe (5) and which is situated on the bore crown (1) or the guide (3) belonging to the bore crown (1) and also to a boring string (4) rotary connected to a drilling machine.
展开▼