CASING BIT AND CASING PIPE TIP STRUCTURE

To improve the workability of removing obstacles by actively cutting obstacles such as reinforced concrete.SOLUTION: In a casing bit 11 having a bit body 13 fixed to a tip of a casing pipe and a tip 15 held by the bit body 13, a flat tip flat surface portion 13a and an inclined flat surface portion...

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Bibliographische Detailangaben
Hauptverfasser:	SHIMOITANI TARO, SHIMOITANI YOSHINOBU
Format:	Patent
Sprache:	eng ; jpn
Schlagworte:	EARTH DRILLING EARTH DRILLING, e.g. DEEP DRILLING FIXED CONSTRUCTIONS MINING OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR ASLURRY OF MINERALS FROM WELLS
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Beschreibung
Zusammenfassung:	To improve the workability of removing obstacles by actively cutting obstacles such as reinforced concrete.SOLUTION: In a casing bit 11 having a bit body 13 fixed to a tip of a casing pipe and a tip 15 held by the bit body 13, a flat tip flat surface portion 13a and an inclined flat surface portion 13b are formed on the surface of the tip portion of the bit body 13. A conical protruding portion 15a, which is a part of a cemented carbide chip, is formed on a part of these flat surface portions 13a and 13b.SELECTED DRAWING: Figure 1 【課題】鉄筋コンクリートなどの障害を積極的によく切れるようにして障害撤去の作業性を向上する。【解決手段】ケーシングパイプの先端に固定されるビット本体１３と、ビット本体１３に保持されたチップ１５を有するケーシングビット１１において、ビット本体１３の先端部の表面に、平らな先端平面部１３ａと傾斜平面部１３ｂを形成する。これら平面部１３ａ，１３ｂの一部に超硬のチップの一部である円錐形状の突出部１５ａを形成する。【選択図】図１