Mitsui Toatsu Chemicals, Incorporated

Kabushiki Kaisha Iseki Kaihatsu Koki

Toa Grout Kogyo Co., Ltd.

Toa Grout Kogyo Kabushiki Kaisha

Tonan Kaihatsu Kogyo Co., Ltd.

Hisashi Kitajima

Sakae Sano

Hiroshi Iimori

Hidehiro Noda

Tadashi Nishio

Yukio Suzuki

Sinkiti Ooka

A method for water leakage prevention in a portion connecting a first pipeline to a second pipeline having one end thereof in communication with a portion of the first pipeline is provided. This method includes the steps of passing elastically deformable drawing means from the other end of the second pipeline to one end of the first pipeline; engaging an impermeable cut-off member, having an expandable hose portion and a flange portion provided integrally with one end of the hose portion, with the drawing means at one end of the first pipeline at the hose portion; drawing the cut-off member into the first and second pipelines by drawing back the hose portion of the drawing means toward the other end of the second pipeline; and disposing the cut-off member in the first and second pipelines, so that the flange portion is positioned within the first pipeline and the hose portion extends within the second pipeline.

Method for water leakage prevention in pipeline

Method for cutting off water in pipeline and structure of connection

A boring-injection device comprises a fluid supplying hollow rod, a fluid discharge portion at the lower end of the rod, and a packer element inflatable from the rod to seal a space between the rod and a borehole wall at a desired depth position. The rod is surrounded by a sheath so that the packer element and fluid discharge portion can be protruded out of and retracted within the sheath in a body. They are retracted during the boring operation and protruded during injecting or investigating operation. The device can be used for practising a method of ground improvement or a method of ground investigation.

Boring-injection device, method for improving ground by means of the

A method for improving the ground or foundation by injecting a grouting agent from the tip end of a hollow injection rod inserted into a boring hole formed in the ground at site so as to infiltrate it into the ground to be solidified. The injection is carried out by varying an injection pressure or injection rate depending on the intensity, particularly, the tensile strength, of the ground so that no vein-like coagulation can be formed around the injection rod, and a columnar or spherical coagulation can be formed.

Method for injecting grouting agent and apparatus for conducting the

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Tokyo, Japan

Hisashi Kitajima