Abstract: A sensor package 10 includes a plurality of sensors 19 and a container 18. Each of the sensors 19 detects a detection target component in the fluid. The container 18 includes an inner channel 21 and a first surface os1. The plurality of sensors 19 are provided in the inner channel 21. The inner channel 21 enables the fluid to flow. An inflow opening 25 to the inner channel 21 and an outflow opening 25 from the inner channel 21 are formed on the first surface os1. An electrode group electrically connected to the plurality of sensors 19 is provided on a surface different from the first surface os1 of the container 18.

Abstract: Provided are a pile joint, a pile coupling structure, and a pile coupling method that allow firm uniting of piles to be coupled. A joint (10) for coupling two piles (12) comprises: a tubular body (16) into which each pile (12) provided with a key (14) on a periphery thereof is inserted through an end (16A) of the body (16); and a fitting portion (22) formed on the body (16) so as to be fitted to the key (14) by the insertion and rotation of the pile (12). The fitting portion (22) is formed with: a tapered shape having a surface (22A) that is inclined so as to become distant from the end (16A) of the body (16) as the surface (22A) extends in the direction of rotation of the pile (12); or a wedge shape for fitting between a projection and a pile.

Abstract: Provided are a pile joint, a pile coupling structure, and a pile coupling method that allow firm uniting of piles to be coupled. A joint (10) for coupling two piles (12) comprises: a tubular body (16) into which each pile (12) provided with a key (14) on a periphery thereof is inserted through an end (16A) of the body (16); and a fitting portion (22) formed on the body (16) so as to be fitted to the key (14) by the insertion and rotation of the pile (12). The fitting portion (22) is formed with: a tapered shape having a surface (22A) that is inclined so as to become distant from the end (16A) of the body (16) as the surface (22A) extends in the direction of rotation of the pile (12); or a wedge shape for fitting between a projection and a pile.