| 摘要 |
FIELD: construction. ^ SUBSTANCE: inspection well contains plastic coupler and plastic foundation connected to coupler; foundation contains at least two holes and tube can be connected to any of them; at that plastic foundation has flux contour between two holes; plastic foundation consists of at least two foundation parts which are connected to each other by connecting method such as gluing, welding and/or pop-rivets. ^ EFFECT: flux contour possess rotation symmetry around the central axis oriented in coupler longitudinal direction. ^ 16 cl, 7 dwg |
