海外用リーフレット／マルチライザー工法
57期 A3 天地297ミリ×左右210ミリ

MULTIRIZER
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In the Multirizer method, drilling and grouting are
performed with the same double-wall drill rod.

i) For cohesive soils, flash setting grout is injected toimprove by the consolidation effect of the grout.

ii) For sandy soils, permeable grout is injected to fill in sandpores after the flash setting grout roughly fills up voids
around the rod and water channels in the target ground.

For cohesive soils, generally, even a highly-permeablechemical grout with a longer gel time is difficult toenter. Therefore, the flash setting grout alone isinjected in 2-shot operation to obtain consolidation
effect by veining intrusion.
For the ground where the cohesive soil is dominantwith minor intervention of sandy soils, combined
grouting is performed by injecting 2 types of grouts
sequentially; the flash setting grout as a main agent
with the permeable grout as a subordinate.

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For the ground where the sandy soil is dominant, on
the contrary, the flash setting grout, causing veiningintrusion, results in partial solidification withoutcontinuity. Water seepage or wall collapse may occur
during excavation. To avoid these troubles, the quick
gel grout is first used, but only for packer formation
around the pipe and for veining intrusion to bindsurrounding sands. Then the permeable grout isinjected as a dominant agent using the same grout
pipe to create a solidified sand-grout mass.
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40 4030 3020 2010 10The Multirizer System overcomes such problems asgrout escape through voids in the ground or blow-up
along the grout pipe by employing combined grouting.
Flash-set grout is injected first, then, the permeation
grouting is performed in the roughly bonded ground.
The combined process allows effective groundsolidification and improves workability to achieve costefficiency.
Based on the results from a series of tests in the "NewGround Improvement Technology Development
Project" conducted in 1975 to 1979 by the Public
Works Research Institute of the Ministry ofConstruction in Japan, it was established that the highpermeability grout of a long gel time should be used toobtain a continuous solidified mass. The Multirizer
method, taking full advantage of the permeation
grouting principle in combination with quick gelgrouting, is an excellent grouting technique to obtain acontinuous solidified mass in a wide range of soils.

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MULTIRIZER
Advantages

Combined Grouting

The Multirizer System incorporates 2 functions into
one system; i) the flash set grouting and ii) thepermeation grouting, using the same double-wall rod
injection system. This epoch-making system provides
reasonable improvement approach of grouting, which
is applicable to a wide range of ground conditions,from sandy to cohesive.

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Quick gel grout injection:
The flow of agent A (permeable grout) and theflow of agent B (flash set reactant) meet at theend of the grout pipe.

Permeable grout injection:
The flow of agent B (flash set reactant) is stopped
and agent A alone is injected.

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Agent A (main agent) and agent B (flash setreactant) meet at the end of the grout pipe.
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2006.06
60.06