GROUND IMPROVEMENT APPLICATIONS OF JET GROUTING TECHNOLOGY IN HONG KONG. Trevi Construction Co., Ltd., Tsim Sha Tsui, Hong Kong

Size: px

Start display at page:

Download "GROUND IMPROVEMENT APPLICATIONS OF JET GROUTING TECHNOLOGY IN HONG KONG. Trevi Construction Co., Ltd., Tsim Sha Tsui, Hong Kong"

Paul Pope
7 years ago
Views:

1 GROUND IMPROVEMENT APPLICATIONS OF JET GROUTING TECHNOLOGY IN HONG KONG Trevi Construction Co., Ltd., Tsim Sha Tsui, Hong Kong

2 Seminar on Grouting and Deep mixing Jet Grouting Technology Features: disaggregation of the soil and its mixing in place with, and partial replacement by, a cement grout mix; the disaggregation is achieved by high energy jet of one or more fluids, one of them being the grout mix itself. Applicable soils: from peaty clays to gravel Achievable results: increasing strength reducing horizontal & vertical permeability(for block treatment) Limits: risk of surface movements highly experienced personnel strict safety rules expensive equipment large quantity of spoil to be managed 2

3 Seminar on Grouting and Deep mixing Grouting methods verses soil type Jet grouting can be used in the largest range of soil types k = m/s k = 10 2 k = 10 3 k = 10 4 k = 10 5 k = 10 6 k = 10 7 Cement Grouting microfine

4 Seminar on Grouting and Deep mixing Jet Grouting Soil Erodibility Soil erodibility plays a major role in determining geometry, quality and production. Cohesionless soils are typically more erodible than cohesive soils. 4

5 Seminar on Grouting and Deep mixing Jet Grouting systems in use in Hong Kong by Trevi cement grout rods rods compressed air cement grout nozzle coaxial nozzle spring or ball-valve spring or ball-valve drilling bit drilling bit single fluid One fluid (cement grout) for both breaking up the ground and cementing it double fluid two fluids (cement grout & compressed air) for both breaking up the ground and cementing it 5

6 Seminar on Grouting and Deep mixing Jet Grouting systems coaxial nozzle cement grout compressed air cement grout compressed air single fluid Typical column s diameters: mm double fluid Typical column s diameters: mm 6

7 Seminar on Grouting and Deep mixing Jet Grouting Spoil Density of spoil = t/mc 40 MPa Pressure kinetic energy Spoil return shall be maintained at all times, to avoid hydrofracturing of soil 220 m/sec 7

8 Seminar on Grouting and Deep mixing Mix type vs permeability & grain size 8

9 Seminar on Grouting and Deep mixing Permeation Grouting Features: Replacing interstitial water or gas of a porous medium with a cement based or chemical grout at injection pressures low enough to prevent uplift. Applicable soils: silty sands to gravel Achievable results: increasing strength reducing horizontal & vertical permeability Limits: experienced personnel quite expensive plants quite expensive QC systems high costs of materials when dealing with fine fissures 9

10 Seminar on Grouting and Deep mixing Fracture Grouting Features: fracturing of a ground by the injection of a grout mix under pressure thick enough to induce excess of local tensile strength and confining pressure. Applicable soils: dense sandy formations, stiff cohesive formations, very soft rock (shale etc.) Achievable results: increased load bearing capacity by compressing the soil between the grout lenses reduced vertical permeability Limits: risk of heaves at the surface experienced personnel extensive instrumentation no influence on horizontal permeability 10

11 Seminar on Grouting and Deep mixing Jet Grouting Characteristics of the treated soils Final Strength is a function of the original ground and the quantity of cement jetted into the ground itself. Permeability = 10-6 m/s m/s (lower values associated to cohesive formations). 11

12 DC/2007/16 Lai Chi Kok Transfer Scheme Location at Ch. 545 TBM maintenance chamber 12

13 DC/2007/16 Lai Chi Kok Transfer Scheme Cross-section chainage 545(TBM maintenance chamber) 13

14 DC/2007/16 Lai Chi Kok Transfer Scheme TBM Maintenance Chamber at chainage

15 DC/2007/16 Lai Chi Kok Transfer Scheme TBM Maintenance Chamber at chainage

16 DC/2007/16 Lai Chi Kok Transfer Scheme TBM Maintenance Chamber at chainage

17 DC/2007/16 Lai Chi Kok Transfer Scheme TBM Maintenance Chamber at chainage

18 DC/2007/16 Lai Chi Kok Transfer Scheme TBM Maintenance Chamber at chainage 545 Pictures taken inside the chamber from TBM 18

19 DC/2007/16 Lai Chi Kok Transfer Scheme Jet Grouting Block Treatment at Break-out 19

20 DC/2007/16 Lai Chi Kok Transfer Scheme SHAFT CROSS-SECTION BREAK-OUT 20

21 DC/2007/16 Lai Chi Kok Transfer Scheme 21

22 DC/2007/16 Lai Chi Kok Transfer Scheme Grout Column Sample Coring at TBM Shaft 22

23 DC/2007/16 Lai Chi Kok Transfer Scheme Grout Column Sample Coring at TBM Shaft 23

24 DC/2007/16 Lai Chi Kok Transfer Scheme Grout Column Sample Coring at TBM Shaft 24

25 Jetting rig SM20 in action at Kowloon (MTR 810A) 25

26 Excavated column in Marine Deposit at Kowloon(MTR 810A) 26

27 Jetting rig SM14 with horizontal silo(background) where overhead restriction applies(pier 15) 27

28 Mixing plant with vertical silos in Central (Contract 18) 28

29 Stans Tunnel Excavation THANK YOU FOR LISTENING. 29

30 U.S.A. TREVIICOS Corporation (Boston) TREVIICOS South Inc. CANADA Trevi Foundations Canada Inc. GERMANY Spezialtiefbau GmbH SWEDEN Hercules Trevi Foundations A.B. Global presence Ground Engineering division ITALY Trevi SpA (Cesena) RCT Srl (Milano) ITALY Soilmec SpA (Cesena) PSM Srl (Treviso) DENMAR K Trevi Branch AUSTRIA Trevi Branch SWEDEN Trevi Branch GERMANY Soilmec Deutschland RUSSIA Soilmec Moscow FRANCE Soilmec France UK Soilmec Ltd CHINA Soilmec China U.S.A. Soilmec North America U.S.A. Watson PANAMA Trevi Panamericana COLOMBIA Galante S.A. COLOMBIA Soilmec Colombia VENEZUELA Trevi Cimentaciones BRASIL Soilmec do Brasil ARGENTINA Pilotes Trevi ALGERI A Trevi Algerie BRASIL TreviGeos EGYPT Soilmec Misr S.A.E. NIGERIA Trevi Foundations ANGOL A Trevi Angola MOZAMBIQUE Profuro Lda TREVI Division SAUDI ARABIA Soilmec Arabia LLC SOILMEC Division TURKEY Trevi Insaat Ve OMAN Swissboring U.A.E. Swissboring QATAR Swissboring KUWAIT Trevi Found. Kuwait SAUDI ARABIA Trevi ASC IRAN Trevi Iran Branch DUBAI U.A.E. SM Emirates LLC SM Gulf FZCO AUSTRALIA Trevi Foundation AUSTRALIA Soilmec Australia JAPAN Soilmec Japan HONG KONG Soilmec H.K. Ltd INDIA Soilmec India HONG KONG Trevi Construction PHILIPPINE S Trevi Philippines Inc. SINGAPORE Soilmec Far East Ltd NEW ZEALAND Trevi Construction 30

MAUVE GROUP GLOBAL EMPLOYMENT SOLUTIONS PORTFOLIO

MAUVE GROUP GLOBAL EMPLOYMENT SOLUTIONS PORTFOLIO MAUVE GROUP GLOBAL SOLUTIONS PORTFOLIO At Mauve Group, we offer a variety of complete employee management services such as Global Employment Solutions (GES), Professional Employment Outsourcing (PEO),