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AssigneeKabushiki Kaisha Komatsu Seisakusho
InventorsShoichi Sakanishi, Tetsuya Shinbo, Tomoyuki Abe, Yasuhiko Ichimura, Yasuo Kanemitsu, Kanji Shibatani, Masahiko Yamamoto, Hiroaki Yamaguchi
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The present invention discloses a system and a method for transmitting data in a shield machine and for calculating the filling amount of a void by detecting the distance to the natural ground. The system and the method are capable of transmitting analogue signals or signals of relatively high frequencies with reliability, enabling an unskilled operator to accurately detect buried articles and accurately carry out the back-filling work. Therefore, an optical rotary joint (100) is disposed between a rotary cutter head (10) and a non-rotary shield body (2) to count time taken to detect the peak value of a reflected signal larger than a standard value or time taken to detect the zero cross position present prior to the peak value. In accordance with the counted time, the distance between the antenna and the natural ground is calculated and displayed. Then, the void volume is calculated in accordance with the distance so that a target value of the back-filling amount is set.
A shield machine apparatus for excavating a void in a natural ground, said shield machine apparatus comprising a non-rotary shield body, a rotary cutter head rotatably mounted on the front end of said non-rotary shield body so as to excavate said void in said natural ground, transmitting/receiving antenna means positioned on one of said rotary cutter head and said non-rotary shield body for transmitting electromagnetic waves toward a portion of the natural ground defining said void and for detecting reflected waves resulting from the reflection of the thus transmitted electromagnetic waves by said portion of the natural ground and producing a reflected signal representative of the detected reflected waves, detection means for detecting either the peak value or zero cross position function of the portion of said reflected signal which is larger than a predetermined standard value;
A method for transmitting and calculating data in a shield machine for excavating a void in a natural ground, said shield machine having a non-rotary shield body, a rotary cutter head mounted on the front of said non-rotary shield body for excavating the void in said natural ground, and a transmitting/receiving antenna means mounted on one of said rotary cutter head and said non-rotary shield body for transmitting electromagnetic waves toward a portion of the natural ground defining said void and for detecting reflected waves resulting from the reflection of the thus transmitted electromagnetic waves by said portion of the natural ground and for producing a reflected signal which is representative of the reflected waves;
Dependencies are inferred from the claim text.