Abstract: The photo survey service system of the invention comprises an image information receiving means 12 for receiving image information from customer's terminal equipment 8 via a telecommunication circuit network 10, which image information is obtained by taking photographs of an area 4 under survey having a plurality of stations 2-1, 2-2, . . . 2-n from a plurality of points using a digital camera 6 at a fixed focal length, an analysis processing means 14 which uses computation processing to calculate a three-dimensional vector relation of each station from the received image information on the basis of a difference in parallax between both images of adjacent photographing points, and an analytical result transmitting means 16 for transmitting information on the calculated three-dimensional vector relation of each station to the customer's terminal equipment 8 via the telecommunication circuit network 10.

Abstract: A concrete admixture or a mortar admixture which is obtained by mixing a silicate with an acid in the presence of water and then solidifying the mixture. It is preferable that the silicate is sodium silicate and the acid is a carboxylic acid. This admixture can improve a tensile strength of a concrete or a mortar. Since a concrete or a mortar containing the admixture, cement, an aggregate and water is high in tensile strength, it can advantageously be used in various concrete structures, concrete products or mortar products.

Abstract: This invention aims to provide a gas-hydrate extracting device and method whereby a high-performance jet fluid is injected from a nozzle at the tip of an extraction pipe inserted into a gas-hydrate stratum, and whereby said jet fluid breaks said stratum so as to form a gas-hydrate mixed fluid that is transferred to surface of the earth, and whereby the void resulting from the removal of said gas hydrate is filled with the components of said high-performance jet fluid and a void-refilling fluid.

Abstract: Cutter spokes are disposed on a cutterhead of a tunnel-excavating machine. Movable blocks, each having a roller cutter, are movably supported by each of the cutter spokes while being connected one another by means of a connection link. A gate mechanism is attached to an end portion of each of the cutter spokes. A machine body is equipped with a roller cutter accommodation box such that through rotation of the cutterhead to a predetermined angular position, the roller cutter accommodation box can be selectively and removably engaged with the end portion of any one of the cutter spokes via the gate mechanism.

Abstract: A domed structure having a retractable roof comprises a field area obtained by digging out a hollow, substantially concave in section, in the ground and levelling the bottom of the hollow seats for the spectators are provided by extending an upward slope outwardly from the end of the field area in an endless manner, and a movable roof element is movably mounted on a rail element laid out on the ground adjacent to the peripheral edge of said hollow. The movable roof element includes a driving arrangement to be placed on the rail element. The rail element may be tilted with a gradient rising toward the direction of solar radiation.

Abstract: A domed structure having a retractable roof comprises an inside field area, a ringed structure vertically provided around said field area, two tracks laid out on the top of said ringed structure and two movable semi-vaults travelling separately on said two annular tracks, which are put one over the other when the roof is opened and are located in opposite relation to each other when the roof is formed, thereby providing a domed roof as a whole. The annular tracks laid out on the top of said ringed structure may have a gradient rising with respect to the direction of solar radiation.

Abstract: An underwater pile-framed structure comprises a plurality of upright piles 11 arranged in two parallel and spaced rows, reinforcing cages 13 surrounding the piles in peripherally spaced relationship thereto, and precast block stacks 22, 23 connecting together the piles in the two rows and surrounding individual pile-cage assemblies in each row. The piles are driven into the seabed in two spaced and parallel rows, the reinforcing cages are lowered over the piles to predetermined positions, the blocks are stacked over the cages to connect together the pile-cage assemblies in the two rows, and concrete is poured into the annular clearances between the piles and the block stacks.