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2006.06
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マックスパーム注入工法 海外用 57期 天地297ミリ×左右420ミリ

Maxperm Grouting System
Reinforcement and liquefaction protection of the soft ground
Development
The MaxPerm Grouting System was developed aiming at soft ground reinforcement.
This is a epoch-making permeation grouting method developed from the principles of Dual-tube
Double Packer Grouting, the most reliable grouting method, having a track record of tens of thousandsof applications. MaxPerm provides a long-term improvement effect by using highly durable grout
materials, which permeate into pore spaces and replace pore water without breaking soil structure.
MaxPerm injection is performed at a very low pressure. It allows smooth improvement directly under
existing structures (such as oil tank and bridge pier) as well as improvement of soft ground in general.

Standauniform

Advantage
Large size improvement

Cost saving

2.0~4.0m

large spacing

Cost saving

MAX PERM

Conventional injection
Large size improvement (about dia. 4m)
done at one time injection.

Larger borehole spacing saves the numberof drillings.

Space saving

Workability

obstacles

Larger injection rate saves injection time.

Labor saving

obstacles

Fine

Improvement is performed from a narrow areawith small and light weight equipment.

Underground obstacles, such as pipes andutilities, does not affect improvement.

Computer controlled injection system saves labor.

SiltySandP2Improvement
provement Sequencemgrout pipe Installation

Packer formation

Injection of Eco-SilicaCasing

1ndCasing23

Speciastraine

Dual-wall hose

4

Plug and sand stuffing

ecial
eve packee packeral-tubeusandse groute.
y underCasing drilling of dia.100mm.

neral.

Install the grout pipe with special
sleeve packers and strainers

Install the dual-wall inner tube
equipped with double packer

Withdraw the casing.

Inflate the special sleeve packers

Re-install the dual-wall innertube equipped with doublepacker
Inject grout through the strainer section.

Injection Rate
Standard injection rate is 15L/min to 20L/min. For the soil with fines, the maximum injection rate to allow
uniform permeation into pore spaces is determined by water injection test (qcr test).

Drillingtime.

Installation

Improvement example under a bridge
pier and abutment

Injection

Improvement example beneath a building

Improvement
zone

Improvement
zone
Fine sandves labor.

Silty sand
Sandy silt

P3

マックスパーム注入工法 海外用 57期 天地297ミリ×左右420ミリ

Large diameter permeation improvement by MaxPerm
Product diameter: 2.0 to 2.5M

N-value
010 20 30 40 50

010+2.5m

0.0m
1.0m

2.0m

3.0m

4.0m

5.0m

6.0m

7.0m

8.0m

9.0m

10.0m

Product diameter: 3.0M

N-value
0.0m

2030

40

50

1.0m

2.0m

3.0m

4.0m

5.0m

6.0m

7.0m

8.0m

9.0m

10.0m

MaxPerm grout plant for liquefaction prevention work at Tokyo International Airport (Haneda)

RAITO KOGYO CO., LTD.
4-2-35 Kudan-Kita,Chiyoda-Ku,Tokyo 102-8236 JAPAN
Phone.81-3-3265-2506(The key number) Fax.81-3-3230-1709
URL http://www.raito.co.jp e-mail h-nishimura@raito.co.jp

2006.06

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