Title:
TUNNEL BORING METHOD USING MUD WATER
Document Type and Number:
Japanese Patent JP3931286
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To perform a tunnel boring work while economically and surely preventing the quality deterioration of mud water even in a clay-containing excavation ground by adding an unsaturated carboxylic polymer salt in combination with sodium carbonate.
SOLUTION: This boring method contains a mud water management process to mix excavation mud water with (A) an unsaturated carboxylic acid polymer salt having a polymerization degree of ≤500 in combination with (B) sodium carbonate at weight ratio (A:B) of 1:(0.5-15) in terms of pure component and keep the concentration of the component A (in terms of pure component) in the mud water to 100-5,000ppm. Preferably, the method also contains a step to separate and remove fine soil particles mixed into the mud water by centrifugal separator and a step to recycle the mud water after the separation of the fine soil particles. The component A is preferably sodium polyacrylate or a sodium salt of a copolymer of acrylic acid and sulfonic acid.
Inventors:
Akio Kurano
Yoshinori Nitta
Kihachi Kaminaga
Shigeru Yamatani
Masahiro Aoyama
Kawamura Yuji
Minoru Okada
Yoshinori Nitta
Kihachi Kaminaga
Shigeru Yamatani
Masahiro Aoyama
Kawamura Yuji
Minoru Okada
Application Number:
JP33240297A
Publication Date:
June 13, 2007
Filing Date:
November 17, 1997
Export Citation:
Assignee:
Toagosei Co., Ltd.
Konoike Gumi Co., Ltd.
Konoike Gumi Co., Ltd.
International Classes:
E21D9/13; C09K8/04; E21D9/06; C09K8/12; (IPC1-7): C09K7/02; E21D9/06
Domestic Patent References:
| JP2169021A | ||||
| JP324146A | ||||
| JP4203199A | ||||
| JP224481A | ||||
| JP8105290A | ||||
| JP4180989A | ||||
| JP62267388A | ||||
| JP6185046A |
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