公开(公告)号：US11320070B2

公开(公告)日：2022-05-03

申请号：US16607943

申请日：2018-07-19

Applicant: KOREA RAILROAD RESEARCH INSTITUTE

Inventor： Jae Heon Choe ,  Kwan Sup Lee ,  Su Yong Choi ,  Chang Young Lee ,  Jung Youl Lim ,  Jin Ho Lee ,  Yong Jun Jang ,  Jeong Min Jo ,  Min Hwan Ok ,  Jae Hoon Kim

IPC: B61B13/10 ,  F16L17/02 ,  G01M3/32

Abstract: A tube infrastructure includes a first tube; a second tube that is coupled to the first tube; and a fluid tank that is disposed to surround a coupling region of the first tube and the second tube and is filled with a fluid to seal the coupling region, wherein the fluid tank allows negative pressure to be maintained inside the first tube and the second tube.