WO2001012952A1 - Tunnel boring method - Google Patents
Tunnel boring method Download PDFInfo
- Publication number
- WO2001012952A1 WO2001012952A1 PCT/EP2000/005991 EP0005991W WO0112952A1 WO 2001012952 A1 WO2001012952 A1 WO 2001012952A1 EP 0005991 W EP0005991 W EP 0005991W WO 0112952 A1 WO0112952 A1 WO 0112952A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- aqueous solution
- boring
- sulphonate
- anionic surfactant
- soil
- Prior art date
Links
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/06—Making by using a driving shield, i.e. advanced by pushing means bearing against the already placed lining
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/02—Well-drilling compositions
- C09K8/38—Gaseous or foamed well-drilling compositions
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/06—Making by using a driving shield, i.e. advanced by pushing means bearing against the already placed lining
- E21D9/0642—Making by using a driving shield, i.e. advanced by pushing means bearing against the already placed lining the shield having means for additional processing at the front end
- E21D9/0678—Adding additives, e.g. chemical compositions, to the slurry or the cuttings
- E21D9/0685—Foaming agents
Definitions
- This invention relates to tunnel boring and to compositions for use therein.
- An EPBS comprises a circular rotatable cutting head mounted on a cylindrical shield of similar diameter such that its axis of rotation coincides with the longitudinal axis of the shield.
- Within the shield there are contained means for feeding materials to the cutting head and means for conveying away the soil. The soil thus passes through apertures in the cutting head to an excavation chamber immediately behind the cutting head, from which it is then removed by conveyor, generally a screw-type conveyor.
- EPBS perform especially well in cohesive soils with good plastic properties, but they are not so efficient in others, for example in thick and sticky soils.
- One solution to this problem was the addition at the cutting head of a foamed aqueous material, which makes soil removal much easier.
- An example of such a process can be found in PCT published application WO 99/18330.
- the soil at the cutting head should be rendered sufficiently plastic by injection of a foamed material, such that it passes through the cutting head into the excavation chamber. At this point, it should be suitable for disposal by conveyor, but this is not always the case.
- a problem encountered with soil from strata with a high proportion of clay and water is that the soil remains very fluid, and this not only makes efficient removal from the excavation chamber difficult, but also results in soil flowing out of the excavation chamber behind the shield.
- the invention therefore provides a process of boring a tunnel using an earth-pressure balance shield boring tunnelling machine having a cutting head, an excavation chamber for soil removed by boring and conveying means for removal of said soil from the excavation chamber; wherein there is injected into a stratum being bored at the cutting head a foamed aqueous solution, characterised in that
- the aqueous solution contains two essential components which are (i) a sulphate- or sulphonate-containing anionic surfactant, and (ii) ⁇ -naphthalene sulphonate-formaldehyde condensate; and in that
- the aqueous solution described at (a) above shall hereinafter be referred to as "the first aqueous solution”.
- the invention is based on the discovery that, in the conditions of tunnelling, the ⁇ - naphthalene sulfonate-formaldehyde condensate (hereinafter referred to by its well-known abbreviation "BNS") and the polyethylene glycol interact in a way whose precise nature is not known but which results in a stiffening of the medium in which they occur together. As a result, the soil containing both becomes less fluid and more suitable for removal by conveyor.
- BNS ⁇ - naphthalene sulfonate-formaldehyde condensate
- the anionic surfactant which is an essential component in the first aqueous solution and an optional component in the second aqueous solution, may be selected from any such sulphate- or sulphonate-containing surfactant known to the art.
- One particularly preferred type is polyalkylene alkyl ether sulphate, where the polyalkylene oxide chain has an average chain length of 2-3 alkylene oxide units.
- Typical commercial materials include the "Alscope" (trade mark) series of Toho Chemical Industry Co.
- monoisopropanol ammonium lauryl alcohol sulphate commercially available as, for example, "Sulfetal” (trade mark) Cjot 160, ⁇ -olefin sulphonate (CAS Registry Number 68439-57-6), commercially available as, for example, “Rhodocal” (trade mark) A-246-L, and C 8.22 fatty alcohol sulphate salts and C 8 - 22 fatty alcohol ether sulphate salts, the fatty alcohol preferably being lauryl alcohol, the ether being an ether formed with a alkylene oxide (preferably ethylene oxide) chain of from 1-3 alkylene oxide units, and the salt-forming cation being preferably selected from alkali metal, magnesium and alkanolamine.
- monoisopropanol ammonium lauryl alcohol sulphate commercially available as, for example, "Sulfetal” (trade mark) Cjot 160, ⁇ -olefin sulphonate (CAS Registry Number 68439-57
- the BNS useful in this invention may be selected from any of the wide range of such materials commercially available.
- BNS is used in large quantities in the construction industry as a so-called “superplasticiser” for concrete.
- examples of commercially- available materials include RHEOBUILD (trade mark) 1100 and RHEOBUILD 5500.
- PEO Polyethylene oxides
- Polyox (trade mark) materials of Union Carbide.
- high molecular weight is meant a material with a weight-average molecular weight of from 100,000 - 8,000,000.
- the preferred molecular range is from 2,000,000-5,000,000.
- aqueous solution there can be added to the first aqueous solution other materials known to the art to be useful for performing specific specialised functions, for example, biocides and complexing agents.
- foam stabilisers typically amines with long fatty acid chains, may also be useful. These additional materials may be used in art-recognised quantities.
- a useful adjunct material is urea, added to the extent of 0.03-0.8%, preferably 0.06-0.25% by weight of the foamed solution.
- the percentage ratio (solids by weight) of surfactant to BNS may vary from 1 :99-99:1, more preferably 90:10-10:90, most preferably 70:30-30:70.
- the two components are dissolved in water to form a concentrate suitable for further dilution, foaming and injection.
- the concentrate will comprise from 5-40%, preferably from 8-20%, by weight solids of surfactant plus condensate.
- this concentrate is diluted with water such that it constitutes from 1-20%, preferably from 2-6% by weight of the final first aqueous solution, and it is then foamed by conventional means to give a foam having from 2-15 times, preferably 8-12 times, the volume of the first aqueous solution prior to foaming.
- the volume of foam injected is from 10-1000 L, preferably 200-600 L, per cubic metre of soil.
- the invention additionally provides a foamable liquid concentrate as hereinabove defined.
- the invention additionally provides a foam as hereinabove defined.
- the polyethylene oxide is dissolved in water to the extent of from 0.5-2.0%, preferably 0.8-1.2%, by weight. If sulphate- or sulphonate-containing anionic surfactant is used in the second aqueous solution, it is present to the extent of from 5-40%, preferably from 8-20% by weight of the second solution. The presence of sulphate- or sulphonate-containing anionic surfactant can assist in the removal of soil from the excavation chamber. When surfactant is present in the second aqueous solution, the solution is foamed by conventional means prior to addition to the excavation chamber and/or the conveyor.
- the second aqueous solution can also contain art-recognised materials in known quantities to perform specific functions. Examples include biocides and defoamers.
- the first aqueous solution is foamed by conventional means and then injected from ports in the cutting head into the stratum being bored. The soil is removed through ports in the cutting head into the excavation chamber.
- the second aqueous solution foamed if it contains an anionic sulphate- or sulphonate-containing surfactant. It is then taken by conveyor out of the excavation chamber for disposal.
- the second aqueous solution may be added at the conveyor.
- the process of this invention has been found to be very useful in the handling of soils which contain a high proportion of clay and water.
- soils which contain a high proportion of clay and water.
- As an example is the soil under Singapore, where the boring of tunnels for an underground railway has proven difficult with known techniques.
- the process of the present invention works well with such soils, allowing an efficient and economical boring and disposal process.
- the invention additionally provides the use of a foam as hereinabove defined in combination with a second aqueous solution as hereinabove defined in the boring of a tunnel using an earth-balanced shield tunnel boring machine.
- Samples of soil taken from the site of the Singapore Metro construction are subjected to the cone penetration test of British Standard BS 1377 Part 2, a test which gives an indication of the plasticity or fluidity of the material under test - the deeper the penetration of the cone, the more plastic or fluid the sample.
- the three samples (Samples 1 ,2 and 3) are treated as follows:
- Sample 2 there is mixed into the soil 0.08% by weight of soil of an anionic surfactant ("Sulfetal” (trade mark) Cjot 160) and 0.04% of BNS ("Rheobuild” (trade mark) 5500).
- Sample 3 as Sample 2, but with the further addition of 0.01% of polyethylene oxide (“Polyox” (trade mark) WSR-301).
- Sample 1 is quite stiff. Addition of the two additives to Sample 2 causes the sample to become quite fluid and easy-flowing. Addition of the polyethylene oxide in Sample 3 causes that sample to become stiff again, but not so stiff as the original.
- Sample 2 treated with a foamed aqueous mixture of ⁇ -olefin sulphonate surfactant ("Rhodocal” (trade mark) A-246-L) and BNS ("Rheobuild” 5500), such that there is added to the soil 0.08% by weight of surfactant and 0.04% BNS.
- ⁇ -olefin sulphonate surfactant "Rhodocal” (trade mark) A-246-L) and BNS (“Rheobuild” 5500
- Sample 3 as Sample 2, with the further addition of 0.01% by weight of polyethylene oxide ("Polyox" WSR-301).
- Example 1 the addition of surfactant and BNS renders the sample more fluid and the further addition of polyethylene oxide stiffens the material again, but not to the same stiffness as the original.
Abstract
Description
Claims
Priority Applications (7)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU61528/00A AU6152800A (en) | 1999-08-12 | 2000-06-28 | Tunnel boring method |
EP00947887A EP1210504B1 (en) | 1999-08-12 | 2000-06-28 | Tunnel boring method |
DE60019434T DE60019434T2 (en) | 1999-08-12 | 2000-06-28 | TUNNEL BORING METHOD |
AT00947887T ATE293207T1 (en) | 1999-08-12 | 2000-06-28 | TUNNELING METHOD |
US10/049,367 US6802673B1 (en) | 1999-08-12 | 2000-06-28 | Tunnel boring with foamed composition |
BRPI0013234-9A BR0013234B1 (en) | 1999-08-12 | 2000-06-28 | Tunnel drilling method and use of aqueous foam in drilling. |
JP2001517027A JP4384832B2 (en) | 1999-08-12 | 2000-06-28 | Tunnel excavation method |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB9918992.0 | 1999-08-12 | ||
GBGB9918992.0A GB9918992D0 (en) | 1999-08-12 | 1999-08-12 | Method |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2001012952A1 true WO2001012952A1 (en) | 2001-02-22 |
Family
ID=10859000
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2000/005991 WO2001012952A1 (en) | 1999-08-12 | 2000-06-28 | Tunnel boring method |
Country Status (14)
Country | Link |
---|---|
US (1) | US6802673B1 (en) |
EP (1) | EP1210504B1 (en) |
JP (1) | JP4384832B2 (en) |
CN (1) | CN1308570C (en) |
AT (1) | ATE293207T1 (en) |
AU (1) | AU6152800A (en) |
BR (1) | BR0013234B1 (en) |
DE (1) | DE60019434T2 (en) |
ES (1) | ES2240122T3 (en) |
GB (1) | GB9918992D0 (en) |
MY (1) | MY124771A (en) |
PT (1) | PT1210504E (en) |
TW (1) | TW477858B (en) |
WO (1) | WO2001012952A1 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2004025080A2 (en) * | 2002-09-13 | 2004-03-25 | Construction Research & Technology Gmbh | Method and composition for reducing wear in a cutting head of a tunnel boring machine |
WO2004076817A1 (en) * | 2003-02-28 | 2004-09-10 | Construction Research & Technology Gmbh | Method and composition for injection at a tunnel boring machine |
WO2016210100A1 (en) * | 2015-06-26 | 2016-12-29 | Dow Global Technologies Llc | Sequential treatment with aqueous sulfonated aromatic polymer and aqueous polyethylene oxide for enhanced water retention |
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CN100569895C (en) * | 2004-12-09 | 2009-12-16 | 中国石化胜利油田有限公司地质科学研究院 | A kind of foaming agent that improves conventional oil deposil erude petroleum recovery ratio and preparation method thereof |
JP2007002168A (en) * | 2005-06-27 | 2007-01-11 | Daiichi Kasei Sangyo Kk | Foaming agent for foam-shielding method |
US20070244204A1 (en) * | 2006-04-13 | 2007-10-18 | Evelyne Prat | Rheology enhancers in non-oilfield applications |
EP2039881A1 (en) * | 2007-09-18 | 2009-03-25 | Bouygues Travaux Publics | Process for determining additives used in tunnel boring machines and device |
EP2235268B1 (en) | 2008-01-28 | 2012-06-27 | Darin R. Kruse | Method for making underground structures |
CN101660419B (en) * | 2008-08-27 | 2013-05-29 | 上海市机械施工有限公司 | Construction method for putting tunnel shield into hole in special stratum |
CN101462844B (en) * | 2009-01-08 | 2012-01-18 | 广州澳润合成材料有限公司 | Environment protection type efficient aerating powder for shield construction |
US9085872B2 (en) | 2011-06-03 | 2015-07-21 | Darin R. Kruse | Lubricated soil mixing system and methods |
JP6113449B2 (en) * | 2012-09-28 | 2017-04-12 | 株式会社フジタ | Mud pressure shield method and mud pressure shield machine |
JP5654170B1 (en) * | 2013-08-29 | 2015-01-14 | 株式会社フジタ | Foaming agent for bubble shield method and bubble shield method |
JP6502812B2 (en) * | 2015-09-24 | 2019-04-17 | 大成建設株式会社 | Bubble shield method |
ITUB20159216A1 (en) | 2015-12-21 | 2017-06-21 | Mapei Spa | FOAMING ADDITIVE FOR THE CONDITIONING OF THE SOIL IN THE PRESENCE OF A MECHANIZED EXCAVATION FOR THE REALIZATION OF TUNNELS |
ITUA20161500A1 (en) | 2016-03-09 | 2017-09-09 | Lamberti Spa | EXCAVATION METHOD IN UNDERGROUND FORMATIONS |
CN106444608B (en) * | 2016-10-31 | 2017-09-22 | 中铁工程装备集团有限公司 | A kind of shield machine fluid multifunctional testing stand |
CN108442931B (en) * | 2018-03-06 | 2019-12-03 | 广西大学 | A kind of large cross-section tunnel passes through longitudinal hard-soft-hard formation construction method |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3215200A (en) * | 1960-10-31 | 1965-11-02 | Nalco Chemical Co | Production of aqueous foams and compositions therefor |
JPS5915476A (en) * | 1982-07-19 | 1984-01-26 | Sumitomo Chem Co Ltd | Preparation of muddy water |
WO1999018330A1 (en) | 1997-10-02 | 1999-04-15 | Mbt Holding Ag | Foaming composition |
Family Cites Families (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB808730A (en) | 1955-01-20 | 1959-02-11 | Olin Mathieson | Improvements in or relating to polymeric compositions |
BE566404A (en) * | 1957-04-05 | |||
NL282018A (en) | 1961-08-23 | |||
US3746096A (en) * | 1969-10-31 | 1973-07-17 | Union Carbide Corp | Surfactant composition |
GB1570329A (en) | 1976-02-12 | 1980-06-25 | Daiko Const | Method and apparatus for excavating horizontal tunnels |
JPS5819618B2 (en) * | 1978-09-25 | 1983-04-19 | 花王株式会社 | Admixture for AE concrete or AE mortar |
US4524002A (en) * | 1983-02-23 | 1985-06-18 | Gaf Corporation | Foaming agent |
WO1990013733A1 (en) | 1989-04-28 | 1990-11-15 | Kabushiki Kaisha Konoike Gumi | Earth pressure system shield process |
US5250578A (en) * | 1991-07-05 | 1993-10-05 | Cornwell Charles E | Foamed cementitious composition and method of making |
FR2728298A1 (en) * | 1994-12-16 | 1996-06-21 | Condat Sa | PRODUCT AND METHOD FOR LUBRICATING THE METAL SURFACES OF AN EARTH PRESSURE TUNNEL |
US5803665A (en) * | 1995-06-07 | 1998-09-08 | Stephens; Patrick J. | Method and apparatus for continuous production of quick-setting foamed cement grout with selectively adjustable proportions |
-
1999
- 1999-08-12 GB GBGB9918992.0A patent/GB9918992D0/en not_active Ceased
-
2000
- 2000-06-28 ES ES00947887T patent/ES2240122T3/en not_active Expired - Lifetime
- 2000-06-28 CN CNB008113742A patent/CN1308570C/en not_active Expired - Fee Related
- 2000-06-28 DE DE60019434T patent/DE60019434T2/en not_active Expired - Lifetime
- 2000-06-28 US US10/049,367 patent/US6802673B1/en not_active Expired - Lifetime
- 2000-06-28 EP EP00947887A patent/EP1210504B1/en not_active Expired - Lifetime
- 2000-06-28 AT AT00947887T patent/ATE293207T1/en active
- 2000-06-28 JP JP2001517027A patent/JP4384832B2/en not_active Expired - Fee Related
- 2000-06-28 BR BRPI0013234-9A patent/BR0013234B1/en not_active IP Right Cessation
- 2000-06-28 AU AU61528/00A patent/AU6152800A/en not_active Abandoned
- 2000-06-28 PT PT00947887T patent/PT1210504E/en unknown
- 2000-06-28 WO PCT/EP2000/005991 patent/WO2001012952A1/en active IP Right Grant
- 2000-07-20 TW TW089114510A patent/TW477858B/en not_active IP Right Cessation
- 2000-08-10 MY MYPI20003643 patent/MY124771A/en unknown
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3215200A (en) * | 1960-10-31 | 1965-11-02 | Nalco Chemical Co | Production of aqueous foams and compositions therefor |
JPS5915476A (en) * | 1982-07-19 | 1984-01-26 | Sumitomo Chem Co Ltd | Preparation of muddy water |
WO1999018330A1 (en) | 1997-10-02 | 1999-04-15 | Mbt Holding Ag | Foaming composition |
Non-Patent Citations (1)
Title |
---|
PATENT ABSTRACTS OF JAPAN vol. 008, no. 098 (C - 221) 9 May 1984 (1984-05-09) * |
Cited By (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2004025080A2 (en) * | 2002-09-13 | 2004-03-25 | Construction Research & Technology Gmbh | Method and composition for reducing wear in a cutting head of a tunnel boring machine |
WO2004025080A3 (en) * | 2002-09-13 | 2004-10-14 | Constr Res & Tech Gmbh | Method and composition for reducing wear in a cutting head of a tunnel boring machine |
AU2003289707B2 (en) * | 2002-09-13 | 2008-04-17 | Construction Research & Technology Gmbh | Method and composition for reducing wear in a cutting head of a tunnel boring machine |
US7718581B2 (en) | 2002-09-13 | 2010-05-18 | Construction Research & Technology Gmbh | Method using composition to reduce cutting head wear |
NO337461B1 (en) * | 2002-09-13 | 2016-04-18 | Construction Research & Technology Gmbh | Method of reducing wear in a cutting head of a tunnel drill |
WO2004076817A1 (en) * | 2003-02-28 | 2004-09-10 | Construction Research & Technology Gmbh | Method and composition for injection at a tunnel boring machine |
US7709422B2 (en) | 2003-02-28 | 2010-05-04 | Construction Research & Technology Gmbh | Method and composition for injection at a tunnel boring machine |
WO2016210100A1 (en) * | 2015-06-26 | 2016-12-29 | Dow Global Technologies Llc | Sequential treatment with aqueous sulfonated aromatic polymer and aqueous polyethylene oxide for enhanced water retention |
CN107810251A (en) * | 2015-06-26 | 2018-03-16 | 陶氏环球技术有限责任公司 | Sequentially handled with waterborne sulfonated aromatic polymer and water-based polyethylene glycol oxide to improve water-retaining property |
CN107810251B (en) * | 2015-06-26 | 2020-11-13 | 陶氏环球技术有限责任公司 | Sequential treatment with aqueous sulfonated aromatic polymers and aqueous polyethylene oxides to improve water retention |
Also Published As
Publication number | Publication date |
---|---|
DE60019434D1 (en) | 2005-05-19 |
DE60019434T2 (en) | 2006-02-23 |
EP1210504B1 (en) | 2005-04-13 |
CN1369033A (en) | 2002-09-11 |
PT1210504E (en) | 2005-06-30 |
ATE293207T1 (en) | 2005-04-15 |
ES2240122T3 (en) | 2005-10-16 |
TW477858B (en) | 2002-03-01 |
JP4384832B2 (en) | 2009-12-16 |
US6802673B1 (en) | 2004-10-12 |
EP1210504A1 (en) | 2002-06-05 |
AU6152800A (en) | 2001-03-13 |
MY124771A (en) | 2006-07-31 |
CN1308570C (en) | 2007-04-04 |
GB9918992D0 (en) | 1999-10-13 |
BR0013234B1 (en) | 2009-01-13 |
JP2003507604A (en) | 2003-02-25 |
BR0013234A (en) | 2002-04-23 |
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