Expansion pipe joint and incineration ash treatment facility

An expansion pipe joint that absorbs displacement occurring at a connection portion between an upstream pipe and a downstream pipe, the expansion pipe joint comprising:

• an outer tube having an upper flange at an upstream end of the outer tube, a lower flange at a downstream end of the outer tube and having a smaller inner diameter than the upper flange, and a body having a tapered shape and connecting the upper flange and the lower flange, and the lower flange coupled to the downstream pipe;
• an inner tube with an open upstream end and an open downstream axial end configured to pass through a powdery and/or granular conveyed object by gravity, wherein the inner tube is interior to the outer tube and has an upper flange at the open upstream end that is coupled to the upstream pipe;
• and
• a closing member with elasticity and between the upper flange of the outer tube and the upper flange of the inner tube to close a gap between the upper flange of the outer tube and the upper flange of the inner tube, wherein
• a position in an axial direction of the upstream end of the outer tube and a position in the axial direction of the open upstream end of the inner tube are substantially the same,
• a dimension position in an axial direction of the open downstream axial end of the inner tube is above a position in the axial direction of the downstream end of the outer tube, and
• a gap in a radial direction exists between the open downstream axial end of the inner tube and the downstream end of the outer tube.