Title:
FOAM GENERATOR FOR AN EARTH-PRESSURE-BALANCE-SHIELD TUNNEL-BORING MACHINE AND METHOD FOR CONDITIONING REMOVED SOIL MATERIAL AS A SUPPORTING MEDIUM FOR AN EARTH-PRESSURE BALANCE SHIELD
Document Type and Number:
WIPO Patent Application WO/2015/128235
Kind Code:
A3
Abstract:
The invention relates to a foam generator (14) for an earth-pressure-balance-shield tunnel-boring machine comprising: a mixing chamber, which has a first inlet opening (22) for a foamable liquid and a second inlet opening (23) for a gas and a foam outlet opening (24); a liquid-feeding device connected to the first inlet opening (22); and a gas-feeding device connected to the second inlet opening (23). The mixing chamber contains a tubular flow chamber (28) having the first inlet opening (22) at one end and the foam outlet opening (24) at the other end. A segment of the flow chamber (28) is designed as a gassing section having a gas-permeable porous wall (26) and adjoins a pressure chamber (29) having the second inlet opening (23) in such a way that the gas fed through the second inlet opening (23) under a pressure enters the flow chamber (28) through the porous wall (26) and, in the flow chamber, mixes with the liquid in such a way that foam is formed. The gas-feeding device and the liquid-feeding device are designed in such a way that the pressure of the fed gas can be set in such a way that the pressure of the fed gas is greater than the pressure exerted on the porous wall (26) by the liquid and that a desired ratio of fed gas to fed liquid is achieved. In a method for conditioning removed soil material as a supporting medium for an earth-pressure balance shield, removed soil is fed to an excavation chamber. Depending on the soil quality, foam is provided in that a foam generator having a gassing section of a specified length, of a specified flow cross-section, and of a specified pore size and pore density is provided and the ratio of fed gas to fed liquid is set in such a way that a desired structure and size of the foam bubbles result. The exiting foam is fed to the excavation chamber and mixed with removed soil.
Inventors:
HÖRLEIN NORBERT (AT)
KLEEN EUGEN (DE)
KLEEN EUGEN (DE)
Application Number:
PCT/EP2015/053400
Publication Date:
November 26, 2015
Filing Date:
February 18, 2015
Export Citation:
Assignee:
MC BAUCHEMIE MÜLLER GMBH & CO KG (DE)
PORR BAU GMBH (AT)
PORR BAU GMBH (AT)
International Classes:
E21D9/06; B05B7/00
Foreign References:
| CN201568057U | 2010-09-01 | |||
| US5071379A | 1991-12-10 | |||
| DE4206831A1 | 1993-07-29 | |||
| DE202004015637U1 | 2005-01-27 | |||
| US4432496A | 1984-02-21 | |||
| US20070051832A1 | 2007-03-08 |
Attorney, Agent or Firm:
ZENZ PATENTANWÄLTE PARTNERSCHAFT MBB (Essen, DE)
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