EP 0305834 A3 19890628 - PROCESS AND APPARATUS FOR MAKING A DUCT IN AN UNDERGROUND BOREHOLE
Title (en)
PROCESS AND APPARATUS FOR MAKING A DUCT IN AN UNDERGROUND BOREHOLE
Publication
Application
Priority
DE 3729560 A 19870904
Abstract (en)
[origin: EP0305834A2] A process and an apparatus for making a duct (24) in a preferably underground borehole (7), in particular with an inaccessible cross-section. So that the duct (24) can be made in stages or continuously and while the borehole (7) is developing, a casing tube (14) is put in directly after a working tube (1) which is used to make the borehole and in which an excavating tool (2) is arranged, which casing tube (14) has a smaller diameter than the developing borehole (7). The casing tube (14) is then pressed forward together with the working tube (1). A hardenable, free-flowing construction material is at the same time inserted from the rear end of the working tube (1) into the hollow space (16) consequently developing between the casing tube (14) and the borehole wall, so that the duct (24) increases to the same extent to which the working tube (1) and the casing tube (14) are pressed forward together (Fig. 1). <IMAGE>
IPC 1-7
IPC 8 full level
E21B 7/20 (2006.01); E21D 9/06 (2006.01); E21D 9/08 (2006.01); E21D 11/10 (2006.01)
CPC (source: EP)
E21B 7/20 (2013.01); E21D 11/10 (2013.01)
Citation (search report)
- [X] GB 2172323 A 19860917 - HOCHTIEF AG HOCH TIEFBAUTEN
- [A] FR 1335954 A 19630823 - GRUNDWASSERBAUTEN AG F
- [A] US 2144013 A 19390117 - FRANCIS DONALDSON
- [AD] DE 2932430 A1 19810219 - HOCHTIEF AG HOCH TIEFBAUTEN
- [A] GB 2167796 A 19860604 - TUNNELINE LIMITED
- [A] FR 1197957 A 19591203
- [AD] DE 3043312 A1 19820708 - WALBROEHL H T DIPL ING [DE]
Designated contracting state (EPC)
AT BE CH DE FR GB IT LI LU NL SE
DOCDB simple family (publication)
EP 0305834 A2 19890308; EP 0305834 A3 19890628; DE 3729560 A1 19890316
DOCDB simple family (application)
EP 88113582 A 19880820; DE 3729560 A 19870904