![[分享]大直径风动潜孔锤引孔技术应用在在硬岩层预制桩拖工中](/skin/img/logo.png){kind=logo}
[分享]大直径风动潜孔锤引孔技术应用在在硬岩层预制桩拖工中
大直径风动潜孔锤引孔技术在含硬岩层预制桩拖工中的应用
Application of large diameter pneumatic DTH hammer drilling technology in rock hard prefabricated piles construction
大直径风动潜孔锤应用于含块石、 孤石、中风化和微风化硬岩或夹层的预制桩沉桩施工成功解决了复杂地层管桩沉桩难题。
The large diameter pneumatic DTH hammer has applied in rock hardness with pebble, boulder, moderated-weathered layer and micro-weathered layer or prefabricated pile construction, which successfully solved complicated layer pile sinking problems.
预应力混凝土管桩是目前应用最广泛的、 较成熟的桩基，因预应力管桩桩体强度高、 施工管理简单、 施工现场文明、 施工速度快等优点， 而被广泛应用于沿海地区的基础工程中。 随着管桩应用的普及，管桩难以穿越复杂地层尤其是块石、孤石、 中风化和微风化硬岩或夹层地层，成为管桩应用的一大障碍。
Prestressed concrete pipe is the most widely used and mature pile foundation for its high strength, easy construction management, civilized construction site and fast speed, thus widely applied in foundation project in coastal areas. With the popularity of tubular pile, it is difficult to drill through the complicated layers, especially pebble, boulder, moderated-weathered layer and micro-weathered layer or Interlayer layer, which has been a major problem in this field.
目前，国内针对管桩引孔技术主要有两方面的研究：非取土引孔沉桩技术和取土引孔沉桩技术。非取土引孔沉桩技术是指通过特殊的方法改变土的物理力学性质，以降低土的侧靡阻力和抗剪强度，满足沉桩需要，该技术包括深层搅拌引孔法、高压旋喷引孔法和射水引孔法等工艺：取土引孔沉桩技术是指通过钻孔的方式减少沉桩阻力，以达到沉桩的目的。该方法主要包括常规钻孔引孔法、长螺旋 引孔法、 潜孔锤引孔法等工艺。
Recently, there are two aspects studies tubular pile drilling technology in China: non-borrowing hole digging pile technology and borrowing hole digging pile technology. The non-borrowing hole digging pile technology refers to change Physical and Mechanical Properties of Soil through special method to reduce its lateral resistance and shear strength to meet its demand. It includes deep mixing hole method, high pressure rotary jetting method and water jetting method, etc. The borrowing hole digging pile technology means through rock drilling method to reduce sinking piling resistance to achieve the aim, it includes regular drilling method, long spiral drilling method and DTH hammer drilling method.
