Title:
EXTRUDING AND EXPANDING DRILL EQUIPMENT AND THE DRILLING METHOD THEREOF
Document Type and Number:
WIPO Patent Application WO/2008/049292
Kind Code:
A1
Abstract:
An extruding and expanding drill equipment includes a vehicle body, a backstay, an outer drill rod, an inner drill rod disposed in the outer drill rod and moving lengthways in it, a windlass, a connecting rod whose upper end connecting with the lower end of the inner drill rod, a rotating drill bit connecting with the lower end of the connecting rod, an expansion mechanism, a driving mechanism and a first cylinder. Said equipment can realize drilling and expanding holes without replacing the drill bit. The bearing capacity of piles is enhanced and the amount of the piles is reduced so as to lower the cost and improve the efficiency.
Inventors:
HE DEXIN (CN)
Application Number:
PCT/CN2007/000647
Publication Date:
May 02, 2008
Filing Date:
March 01, 2007
Export Citation:
Assignee:
HE DEXIN (CN)
International Classes:
E21B10/32
Domestic Patent References:
| WO2002048466A1 | 2002-06-20 |
Foreign References:
| CN2767507Y | 2006-03-29 | |||
| CN2526490Y | 2002-12-18 | |||
| CN2458344Y | 2001-11-07 | |||
| CN2718062Y | 2005-08-17 | |||
| CN2698954Y | 2005-05-11 | |||
| JPH08303169A | 1996-11-19 |
Other References:
See also references of EP 2077373A4
Attorney, Agent or Firm:
CHINA SCIENCE PATENT & TRADEMARK AGENT LTD. (Bldg. B Tsinghua Tongfang Hi-Tech Plaza,No. 1, Wangzhuang Rd.,Haidian District, Beijing l, CN)
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