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- According to the exploration problems in an open-pit mine,a new drilling method using reverse circulation DTH hammer drill is put forward. 针对露天矿钻探施工中存在的问题,提出了利用贯通式反循环潜孔锤进行施工的新方法。
- The drill can be used in the drilling technologies of normal or reverse circulation in the quaternary period gravel or hand rock ground. 演练中，可用于钻井技术的正常或反循环在第四纪时期，砾石或手岩石地面。
- The procreative blanking plug of the "Y type" pipe string has check valve function and it can conveniently for reverse circulation well cleanup. 型管柱中的生产堵塞器具有单流阀作用,可方便进行反循环洗井;同时,具有独特外泄压系统,使堵塞器打捞在压力平衡状态下进行,且密封可靠,保证所取资料的准确性。
- Barge was used in sea pile construction,and FGC-15D large diameterwet reverse circulation DTH was adopted for hole completion. 利用驳船进行海上基桩施工，采用FGC-15D型大直径湿式反循环潜孔锤钻进成孔，满足施工工艺和工期要求。
- The paper introduced the use of airlifting reverse circulation rotary drilling techniques in practice of major diameter socket pile operation at Xiangfan city s Hanjiang No. 介绍了使用泥浆护壁气举反循环回转钻进工艺进行襄樊汉江四桥大口径嵌岩桩的施工实践。
- The special reverse circulation swivel that matches with the improved shaft is developed.The construction and application of the swivel are introduced in this paper. 本文介绍了所设计的反循环水龙头的结构组成及其现场使用情况。
- Manufacture and improvement on self-propelled direct and reverse circulation construction drill is introduced with the main technique parameter,specification and pilot production. 介绍了自走式正反循环工程钻机的研制改进概况以及主要技术参数、性能特点、生产试验情况等。
- Abstract: Rig GFC - 120 is a kind of self moving reverse circulation rotary rigs.It is mainly used to drill side foundation holes and small water wells. 中文摘要: GFC-120型钻机为自走式动力头回转反循环钻机，用于降水井和护坡桩基础孔以及小型水井的施工。
- This machine adopts two species of drillingtechnique of direct and reverse circulation, the efficiency enhances observably in the process of ovum, gravel and rock layer construction. 该机可采用正反循环两种钻进工艺，在卵、砾、岩层施工中，效率显著提高。
- Air driven hollow DTH hammer is applied,along with a set of dual wall drilling pipe and a specially designed reverse circulation bit,to conduct continuous coring reverse circulation drilling. 气动贯通式潜孔锤与双壁钻杆及专门研制的反循环钻头 (获国家发明专利 )配套使用 ,可实现反循环连续取心 (样 )钻进新工艺 ,连续获取的岩样采取率高 ,品质好 ,代表性强。
- Pound notes have been withdrawn from circulation. 一英镑面值的钞票已停止流通。
- Harvey discovered the circulation of the blood. 哈唯发现了血液循环。
- We observed the circulation of blood in frogs. 我们观察了青蛙的血液循环。
- The old coins have been withdrawn from circulation. 旧硬币已经收回不再流通了。
- A disadvantage of the turbine is that it is not reversible. 涡轮机的一个缺点就是它不可以反转。
- Many forged notes are in circulation. 许多假钞在流通。
- This magazine has a large circulation. 这本杂志发行量很大。
- These ideas have been in circulation for some time. 这些想法已经流行了一段时间。
- Air Lifting Reverse Circulation Bits 气举反循环钻进用钻头
- DIFN had a change pattern revers... 中国科学院研究生院;
