Shimizu Construction Co., Ltd.

Nippon Kokan K.k.

Minoru Imai

Hideo Watanabe

Tomohiro Bessho

Minoru Sawaide

Yasuo Kajioka

Mitsugu Kuramochi

Takeji Okada

Gaku Matsumoto

Tamiki Koyama

Katuhiko Kimura

Takayoshi Ota

Tomoo Suzuki

Daisuke Tachibana

A high-damping probe capable of obtaining not only sound velocity information but also other ultrasonic information useful for ultrasonic testing, such as the frequency and amplitude of the received wave, and also capable of increasing the accuracy of ultrasonic testing of structures made of concrete or other materials. The high-damping probe includes a transducer having a low-frequency damper attached thereto. By virtue of the above-described arrangement, the transmission wave will not oscillate for a long period of time and it is therefore possible to clearly discriminate between the transmission wave and the received wave. Since the received wave can be distinctly separated from the transmission wave, it is possible to obtain ultrasonic information such as the frequency and amplitude of the received wave. Further, it is possible to impart wide-band frequency characteristics to the probe, so that it becomes conformable to an ultrasonic testing device wherein the transmission frequencyt is variable. In addition, an ultrasonic measuring apparatus using the high-damping probe enables highly accurate measurement of the sound velocity of the shear wave, the thickness of the object and the position of an internal void.

Ultrasonic measuring apparatus using a high-damping probe

A substantially water-resistant resin-coated aggregate for use in concrete includes a porous aggregate body, such as an artificial light weight aggregate, with an elastic layer made of a phenol resin elastomer deposited on the aggregate body, a rigid phenol resin coated on the elastic covered aggregate body. This resin-coated aggregate has a high water absorption prevention and further an external stress-damping function.

Resin-coated aggregates

A method of placing concrete into a steel encasement constructing an offshore structure. The steel encasement is erected. A plurality of first concrete injection holes are formed through the steel encasement in a heightwise spaced manner. The concrete is injected through the lowest disposed concrete injection hole into the erected steel encasement to a level below another concrete injection hole disposed just above said lowest disposed concrete injection hole. Then, the injection step is repeated in connection with a subsequent first concrete injection hole nearest to the level, to which the concrete has been placed, for placing the concrete into the steel encasement to a predetermined level.

Method of placing concrete into a steel encasement

Growing community of inventors

Tokyo, Japan

Minoru Imai