海外用リーフレット ライトインク用／RAS-JET
60136̲K A4天地297ミリ×左右210ミリ

RAS-JETSYSTEM         Advantages
1 . Mechanical Mixing Part
1) Dual and counter rotation mechanism eliminates theproblem that soil and mixing blades turn together,resulting in poor mixing.
2) High torque motor enables large-diameter
improvement (dia. 1600mm to 2000mm, excluding
the jet grouting part).
3) Counter rotation mechanism with dual wall rod
contributes to high drilling accuracy.
4) Computerized control system enables real-timemonitoring of improvement.

Principle
In RAS-JET system, a cement based hardening
agent is discharged and mechanically mixed with insitu soil by rotating mixing blades while the same
slurry is jetted from the end of a blade at the sametime. With this system, the homogenous soil-cement
column mass of a large diameter will be installed
underground.

Equipment configuration

2. Jet Grouting Part
1) Super high pressure jet of slurry cuts and breaks insitu soil and produce homogenously improved zone
around the mechanically mixed core.
2) Improved soil-cement product follows the geometryof adjacent underground structures and tightly
contact to the surface of structures.
3) Buried obstacles will be efficiently encompassedwith improved soil.
4) Very large diameter improvement will be obtained dueto the slurry jet discharged at the end of the largediameter blade.large-diameter rotation blades.

Major equipment
Item

Type

Rig

120t class 2-stay piling rig

RAS-JET Auger Mechanism

Dual rotation type

Full-automatic Slurry Plant

45m3 classHigh pressure pump
100 100

Forjetting

90 90
80 80

60 6050 50

30 30

for mechanical mixing

800KVA or more

for slurry plant

220KVA

JGenerator

70 70

40 40

Mixing w
JettingHigh pressure air compressor

Back-hoe

0.6m3 class

Cement Silo

30t class x 2

Water Tank

20m3 class x 2

Agitator

1.5m3 (when necessary)Computerized Control System

For speed, depth, flowrate etc.

20 20
10 10100 100

Formechanicalmixing

90 90
80 80
70 70

50 50
40 40
30 30
20 2010 10***

Crawler Crane

60 60

Equipped Lift

Slurry plant

Joint Mechanism

50t classHydraulic telescope type* used when rod jointing is required.

166TE   

RAS-JET SYSTEM
Standerd ConstructionSequence with Rod Jointing

Test Jetting

Column center marking,Work platform and slurry
preparation

Preparation
Set equipment
to the column center

Discharge small
amount of slurry

Surface drilling
Drilling and mixing
Spoil
Treatment

Rod Connection

QUALITY CONTROL DEVICE

Parameters
to be monitored

Drilling and mixing
Reach design depth
Mixing withJetting

Slurry Discharge

Churning◊ Penetration Depth◊ Penetration Rate
◊ Discharge Rate
◊ Motor Current

Bottom mixing
Withdraw with mixing
Spoil
Treatment

Rod Disconnection
Withdraw with mixing
Equipment relocation

Test Results
SampleLocation

Unit WeightMechanical
Mixing Part
Jet Grouting
Part3(kg/m )UnconfinedCompressiveStrength

Deformation
Modulus2(kgf/cm )(kgf/cm2)

1,486

23.6

2,730

1,472

36.1

5,080

1,443

20.9

3,700

(center side)

Jet Grouting
Part(periphery)

W/C=100%

Column Product with
Jet Grout Lapping

Improved Column Product 

1660 Factor Avenue San Leandro, CA 94577 Toll Free : 1- 866- DEEPMIX (1- 866- 333 -7649
TEL. 510-346-9840 FAX. 510-346-9841 e-mail info@raitoinc.com Website : www.raitoinc.com

2007.01
60.01