EP 0251660 A1 19880107 - Method and apparatus for soil excavation and the like.
Title (en)
Method and apparatus for soil excavation and the like.
Title (de)
Verfahren und Vorrichtung zum Ausheben von Boden und dergleichen.
Title (fr)
Procédé et dispositif d'excavation du sol ou similaire.
Publication
Application
Priority
US 87728086 A 19860623
Abstract (en)
A method and apparatus (2) suitable for excavating a soil mass and like granular materials in which pressurized gas, preferably air, is provided in a reservoir and directed through appropriate valve (4) and duct means to a converging/diverging nozzle (50) positioned at the exit of the duct means. The nozzle includes a restricted throat section and a diverging transitional section which terminates in an outlet section. The ratio of the area of the outlet section to the area of the throat section is greater than 1.0 and preferably greater than 1.2 or more, while the ratio of reservoir pressure to ambient pressure is greater than about 1.9 and preferably greater than 3.7, whereby a gas stream having a calculated velocity greater than Mach 1, and preferably in excess of Mach 1.5 or more, is produced. The high velocity gas stream infiltrates the soil mass creating fissures and cavities, then stagnates within the cavities and violoently expands to fracture the mass.
IPC 1-7
IPC 8 full level
E02F 3/02 (2006.01); E02F 3/04 (2006.01); E02F 3/88 (2006.01); E02F 3/92 (2006.01); E02F 5/10 (2006.01); E02F 5/28 (2006.01)
CPC (source: EP)
E02F 3/88 (2013.01); E02F 3/9206 (2013.01); E02F 5/287 (2013.01)
Citation (search report)
- [X] GB 1491687 A 19771109 - HOLLANDSCHE AANNEMINGMAATSCHAP
- [A] US 2413561 A 19461231 - HEHR FREDERICK G
- [A] FR 682517 A 19300528
- [A] US 3917007 A 19751104 - TSIFEROV MIKHAIL IVANOVICH
- [A] US 4127950 A 19781205 - TILLINGHAST WILLIAM S, et al
- [A] FR 2096630 A1 19720225 - COMMISSARIAT ENERGIE ATOMIQUE
- [A] US 4322897 A 19820406 - BRASSFIELD ROBERT W
- [A] GB 1536591 A 19781220 - ANDERSON STRATHCLYDE LTD
- [A] US 4084648 A 19780418 - YAHIRO TERUO, et al
Designated contracting state (EPC)
AT BE CH DE ES GB IT LI LU NL SE
DOCDB simple family (publication)
EP 0251660 A1 19880107; EP 0251660 B1 19921104; AT E82027 T1 19921115; AU 593600 B2 19900215; AU 6659586 A 19871224; DE 251660 T1 19900816; DE 3782458 D1 19921210; DE 3782458 T2 19930318; ES 2035862 T3 19930501; FR 2600373 A1 19871224; FR 2600373 B1 19890428; JP S634130 A 19880109
DOCDB simple family (application)
EP 87305583 A 19870623; AT 87305583 T 19870623; AU 6659586 A 19861216; DE 3782458 T 19870623; DE 87305583 T 19870623; ES 87305583 T 19870623; FR 8613220 A 19860922; JP 25958186 A 19861030