Mitsui Toatsu Chemicals, Incorporated

Toa Grout Kogyo Co., Ltd.

Tonan Kaihatsu Kogyo Co., Ltd.

Hiroshi Iimori

Hisashi Kitajima

Sakae Sano

Tadashi Nishio

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.

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Yokohama, Japan

Hiroshi Iimori