Sekisui Chemical Co., Ltd.

Gifu University

Takushi Minagi

Yoshiharu Nozaki

Hiroshi Sugahara

Takashi Yamamoto

Shinji Kakine

Hiroshi Iida

Masanori Asano

Toshiro Kamada

In an embodiment, a shaping frame () of a pipe producing apparatus () includes a plurality of linking bodies () in which a pair of linking elements () are rotatably coupled via a coupling shaft (), a bending link () with opposite ends of which coupling elements are rotatably coupled via coupling shafts () and which expands or contracts the shaping frame (), a drive unit () with opposite ends of which coupling elements () are rotatably coupled via coupling shafts () and which forcedly sends out a profile strip () from the inside, and a joint unit () with opposite ends of which coupling elements () are rotatably coupled via coupling shafts () and which is provided at a joint portion () of a winding of the profile strip.

Pipe producing apparatus and existing pipe rehabilitating method employing the same

An impact elastic wave test is conducted to measure propagating waves in a pipe to be examined, a frequency spectrum of the propagating waves is analyzed, and at least a spectral area value in a first frequency region and a spectral area value in a second frequency region of the frequency spectrum are evaluated, thereby determining a type of a deteriorated state of the buried pipe. A correlation relationship between a parameter obtained from a force-deformation relationship indicating a relationship between a force externally input to a sample pipe and a deformation of the sample pipe due to the force, and impact elastic wave test data obtained by conducting an impact elastic wave test with respect to the sample pipe is previously obtained, an impact elastic wave test is conducted with respect to a pipe to be examined to collect impact elastic wave measurement data of the pipe to be examined, and the actually measured impact elastic wave measurement data is evaluated based on the correlation relationship, thereby quantitatively determining a degree of deterioration of the pipe to be examined.

Buried pipe examining method

Deterioration of reinforced concrete pipes is checked and the deterioration progress level is classified. Based on the inspection result, a portion to be inspected in detail in an inspection area is selected. With respect to the selected portion to be inspected in detail, the pipe thickness and the diameter of reinforcing bars are measured and the location of reinforcing bars in the portion to be inspected in detail are checked. Using the data of the thickness of a pipe, the diameter of the reinforcing bar and disposition of the reinforcing bars, structural analysis is carried out and the strength of the reinforced concrete pipe is calculated. The calculation result is used as information for evaluating the deterioration state of the reinforced concrete pipe.

Inspection method and inspection apparatus of reinforced concrete pipe

Method and equipment for inspecting reinforced concrete pipe

Growing community of inventors

Kyoto, Japan

Takushi Minagi