wash boring

Realization of automatic percussive drilling by microcomputer control system;

微机控制自动冲击钻进的实现

GCF-20A reverse circulation percussive rotary drill rig is a multi function drill rig with percussive drilling as the main means and rotary drilling as supplemented.

GCF - 2 0A型冲击 -回转反循环工程钻机是以冲击钻进为主、回转钻进为辅的多功能钻机 ,可适应软、硬岩石等不同地层钻进的要求。

cone bit/disc cutter drilling method, percussive drilling method (no circulation and reverse circulation) and air/fluid powered DTH drilling method, is described with concrete proposals initiated for increasing the technical level of large diameter rock socket drilling.

分析了大口径嵌岩钻进面临的主要技术难点，并对目前国内常用的３种大口径嵌岩钻进方法牙轮／滚刀钻进法、冲击钻进法（包括无循环和反循环）和气动／液动潜孔锤钻进法的技术现状作了介绍，提出了提高我国大口径嵌岩钻进技术水平的建议。

Problems of impact rammer in percussion drilling of pebble bed;

冲击钻进卵砾石地层中冲击锤问题的探讨

The description is made of the introduction and analysis of the popular drilling hole technique that used in large boulder formation, including normal drilling technique such as digging, percussion drilling, rotary drilling, large diameter DTH drilling, explosion drilling technique and combined drilling technique.

介绍了目前在含巨大孤石地层中的成孔方法 ,包括一般方法如开挖法、冲击钻进、回转钻进、大直径潜孔锤钻进、爆破法、复合钻进工艺。

In which,rotary drilling is suitable to strata with pebbles grain-size<80-100mm, percussion drilling requires total amount of pebbles<200mm not exceed 50%,and strata uniform,while the percussion rotation drilling is suitable to strata contain boulders.

结合施工过的水井实例,介绍了水文水井钻探施工中常用的钻探工作类型:回转钻进,冲击钻进及冲击回转钻进。

Analysis of irrigation and drainage by skull perforation for treating chronic subdural hematomas

慢性硬膜下血肿钻孔冲洗引流治疗的探讨

Analysis of Surgical Complications Caused by Chronic Subdural Hematomas with Burr Holes Irrigation and Drainage

钻孔冲洗引流治疗慢性硬脑膜下血肿手术并发症的分析

Clinical analysis of 64 cases with chronic subdural hematoma treated by operation with drilling holes irrigation and drainage

钻孔冲洗常压引流加负压引流治疗慢性硬膜下血肿64例临床分析

Clinical analysis of 256 cases of slow subdural hematoma in usual atmospheric pressure by using BHID.;

常压下颅骨钻孔冲洗引流术治疗外伤性慢性硬膜下血肿256例临床分析

Clinical Investigation of Double-Cavity Cannula Irrigation and Drainage for Treatment of Bilateral Chronic Subdural Hematoma

钻孔后双腔管冲洗引流治疗双侧慢性硬脑膜下血肿

rotary wash-boring equipment

旋转式水冲钻孔设备

Clogged or cave-in of the hole, can lead to a stuck drill. It is best therefore, to cleans the hole regular intervals, by carrying out air-blowing with the rock drill.

因为堵块和空穴都可能导致卡钻，因此应定期采用冲击器强吹，定期清洗孔底。

Study on the Mechanism of Treatment of Ganfh with Drilling and Decompression, Placement of Drainage Tube and Flushing with Huo Gu Injection;

股骨头钻孔减压置管活骨注射液冲洗治疗激素性股骨头坏死机理研究

Hole Clearing by air-lift reverse circulation method in bored piles

冲(钻)孔灌注桩气举反循环清孔工艺

Analysis and Treatment of an Accident of Blocking Bore of Excavated Hole Driven Cast-in-Place Pile by Percussion Drill

一起冲击钻成孔灌注桩卡钻事故的分析与处理

Supporting the use of impact drilling electric drill. Drilling, hole spacing with hole depth should meet the design requirements.

（1）钻孔使用配套冲击电钻.钻孔时,孔洞间距与孔洞深度应满足设计要求.

Downhole drill hammers and drills

GB/T13344-1992潜孔冲击器和钻头

Construction Method and Technical Measurement of Drilling (Wash) Bore Concrete Piles

钻(冲)孔混凝土灌注桩施工方法与措施

On the Mud Property of Bored or Punch Piles

钻(冲)孔灌注桩泥浆性能指标及应用

Key Construction Technology and Problem Treatment on Impact Bored Pile

冲击钻孔灌注桩施工要点及问题处理

MOMENTARILY PULL AND THEN RELEASE THE WASH BUTTON ON THE STALK SWITCH.

拉一下，然后释放开关孔上的冲洗按纽。

FLUSHING LIQUID WITHOUT CLAY AND DRILLING FLUID ADDITIVE MADE FROM ELM BARK

用榆树皮制无固相冲洗液和钻井液添加剂

Penetration Mechanism of DTH Percussion Compact Drilling and Experimental Research on Compact Bit;

潜孔锤冲击挤密钻进机理及挤密钻头的设计与实验研究