牙掌岩石扩孔器

组合牙轮钻头主要应用于桥梁、高楼的钻孔桩基岩钻进，用户遍及地勘、铁道、水利、建筑等各个系统，用于灌注桩基岩钻进，水井和通风孔钻进，适用地层为强、中、微风化岩石和卵砾石，如花岗岩、片麻岩、砂岩、灰岩、页岩等,各种地层非开挖及穿越施工.
优点: 是可以根据使用要求定做钻头尺寸、类型，价格成本较低 。

Roller bit assembly bit is mainly used in Bridges, high-rise pile base rock drilling, drilling geological exploration, railway, water conservancy, construction and other customers throughout each system, used in rock drilling bored piles and vent hole drilling Wells, used in the formation of strong, and the breeze rocks and gravel, such as granite, gneiss, sandstone, limestone, shale and so on, all kinds of stratum trenchless and crossing construction.
Advantages: bit size can be ordered according to your requirement, price cost is low.

直径（Diameter mm ） 295 - 3000 mm
牙掌（Roller bits）IADC code 117、127、137、217、247、417、437、517、537、617、637
推荐钢齿钻体（Recommended steel tooth） 土层、粘土、灰质泥岩等 0-20Mpa
Soil, clay, lime mud stone 0-20Mpa
推荐镶齿钻体（Recommended TCI insert tooth） 强风化、中风化、硬岩等 20Mpa以上
Strongly weathered, weathering, hard rock and so on more than 20Mpa