| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a pressure releasing device for underground structure capable of releasing pressure with a simple structure. <P>SOLUTION: A pressure releasing device for underground structure is provided with an air-permeable lid body 12 which communicates with a sewer pipeline A and which is supported by the ground surface opening edge part of an underground structure B open to the ground surface, through a lid body support frame 13, and a pressure adjusting unit 20 which is arranged under the air-permeable lid body 12 and which divides the inside of the underground structure B into the air-permeable lid body side and the sewer pipeline side. The pressure adjusting unit 20 has a check valve for operating in the opening direction by the rise in the pressure on the sewer pipeline side in the underground structure so as to open the pressure on the sewer pipeline side to the air-permeable lid body side. The pressure adjusting unit 20 is provided with a fixing overhang part 21 held between the lid body support frame 13 and the air-permeable lid body 12 and a swollen part 23 in a form of projecting downward supported by the fixing overhang part 21, and the check valve 34 is disposed in the swollen part 23. <P>COPYRIGHT: (C)2012,JPO&INPIT |
