Patent ID: 9523450
Filing Date: 2016-12-20
CPC Classification: F16L

Claim Text:
1. A flange joint connection structure, comprising: a flange joint; a pressure pipe, said flange joint comprising: a center hole, for inserting said pressure pipe into; an insertion-side face, said face being on a side on which the pressure pipe aligned on a centerline is inserted into the center hole; a connection-side face, said face being on a side to which another component is connected; an outer circumferential surface; said surface connecting the insertion-side face and the connection-side face; horizontal holes penetrating parallel to the center hole between the insertion-side face and the connection-side face, in which horizontal bolts are fastened; vertical holes each comprising an inner wall being provided with a screw thread, said vertical holes penetrating from the outer circumferential surface to the inner hole between the insertion-side face and the connection-side face between the horizontal holes, wherein the vertical holes being shifted so as to spiral entirely around the centerline from the insertion-side face to the connection-side face so that the vertical holes overlap one another on the outer circumferential surface; said pressure pipe comprising: an outer circumferential surface inserted into the center hole of the flange joint; recesses arranged to positions corresponding to the spirally shifted vertical holes, the recesses and the vertical holes being respectively arranged on the flange joint and the pressure pipe at intervals of equal angle shifting positions on the centerline between the insertion-side face and the connection-side face; wherein bolts screwed into the vertical holes of the flange joint from the outer circumferential surface penetrate and are interfitted to the recesses.