Abstract: A mine detector is provided for detecting buried land mines safely and promptly. A sensor head (12) is connected to a detector body (1) through hinges (11-1 to 11-4) and arms (12-1 to 12-3). The sensor head (12) includes a transmitting and receiving means for emitting electromagnetic impulses to the ground within a range of detection of land mines. When the transmitting and receiving means receives electromagnetic waves reflected from a land mine, information on the three-dimensional structure of the land mine buried under the ground is generated on the basis of the time of arrival of the reflected wave, the level of the reflected wave and the x and y coordinates of the transmitting and receiving means, and the information is displayed on a display (1). The detector is also applicable to the inspection of steel rods and bars for concrete reinforcement.

Abstract: A mine detector is provided for detecting buried land mines safely and promptly. A sensor head (12) is connected to a detector body (1) through hinges (11-1 to 11-4) and arms (12-1 to 12-3). The sensor head (12) includes a transmitting and receiving means for emitting electromagnetic impulses to the ground within a range of detection of land mines. When the transmitting and receiving means receives electromagnetic waves reflected from a land mine, information on the three-dimensional structure of the land mine buried under the ground is generated on the basis of the time of arrival of the reflected wave, the level of the reflected wave and the x and y coordinates of the transmitting and receiving means, and the information is displayed on a display (1). The detector is also applicable to the inspection of steel rods and bars for concrete reinforcement.

Abstract: Method for investigating the ground structure of a paved road which requires only a small diameter boring for direct observation of the ground structure. The method comprises a step of boring an investigation hole with a small diameter which reaches at least a sand layer of a roadbed, penetrating a paved floor of said paved road, a step of cleaning an inside of said investigation hole which is bored by said boring step, a step of photographing in said investigation hole which has been cleaned by said cleaning step, said photographing step photographing an overall surface of an inner circumferential wall of said investigation hole by means of image pickup means, a step of sending this image to a warping microprocessor, a step of recording said photograph data in recording means, and a step of filling up said investigation hole after said photographing step is finished to repair the hole.

Abstract: The present invention provides a cavity examination method of a paved road which can examine cavities which are present under the paved road such as the asphalt-paved road in a reduced length of time. By collecting data of the structural conditions of areas under the paved road while traveling on the road by a pavement structure examination vehicle mounted with underground radar means, and scrutinizing according to the above results around the place which may contain a cavity by a pushcart type underground radar means, the cavity examination method of the present invention specifies presence and a planar extent of the cavity. If a cavity is actually detected, a hole with a small diameter is bored in the place and its inner circumferential wall is photographed by a camera to confirm the conditions of the cavity and the area under the pavement by a visual inspection in order to grasp the three dimensional conditions of the cavity.

Abstract: A pavement structure examination vehicle capable of mounting all necessary equipments and instruments therein; including a body of a rear gate type having a rear door which rotates vertically to open and close, underground radar means attached to the body vertically movably relative to the direction of traveling, a stand for boring operation to be removably attached to the door, a radar system comprising underground radar control means for controlling the underground radar means and observation data recording means for recording the observation data of the underground radar means, the radar system recording in the data recording means information of the distance covered by the vehicle received from covered distance detection means which detects the distance covered by the vehicle, together with the observation data of the underground radar means, and an image processing system for photographing a surface of an inner circumferential wall of a bored hole and processing images thus photographed.