JPS5740012A - Falling device for rubber dam - Google Patents
Falling device for rubber damInfo
- Publication number
- JPS5740012A JPS5740012A JP11581780A JP11581780A JPS5740012A JP S5740012 A JPS5740012 A JP S5740012A JP 11581780 A JP11581780 A JP 11581780A JP 11581780 A JP11581780 A JP 11581780A JP S5740012 A JPS5740012 A JP S5740012A
- Authority
- JP
- Japan
- Prior art keywords
- water level
- rubber dam
- planned
- dam
- float valve
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Abstract
PURPOSE: To slowly bring down a rubber dam in such a way as to avoid the formation of corrugation by providing a float valve capable of opening the dam when the upstream water level of the rubber dam reaches more than a planned falling water level and also of closing it when the upstream water level is reduced below the planned falling water level.
CONSTITUTION: Under a condition that a valve 18 and a manually operating valve 23a are closed, air is supplied from a supply means 22 into a rubber dam 1 to erect the rubber dam. When the upstream water level of the dam reaches the position A of planned falling water level, a float valve 28 operates to slowly discharge air from a small diameter discharge pipeline 27, whereupon no corrugation is formed. In case where the water level is reduced below the planned falling water level before completely evacuating the rubber dam, the float valve 28 closes the pipeline 27 to enable the rubber dam 1 to keep storing a specific amount of water.
COPYRIGHT: (C)1982,JPO&Japio
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP11581780A JPS5740012A (en) | 1980-08-25 | 1980-08-25 | Falling device for rubber dam |
US06/238,892 US4498810A (en) | 1980-03-06 | 1981-02-27 | Collapsible rubber dam |
IT20161/81A IT1137416B (en) | 1980-03-06 | 1981-03-05 | Collapsible rubber dam for river |
GB8107060A GB2077825B (en) | 1980-03-06 | 1981-03-06 | Collapsible rubber dam |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP11581780A JPS5740012A (en) | 1980-08-25 | 1980-08-25 | Falling device for rubber dam |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5740012A true JPS5740012A (en) | 1982-03-05 |
Family
ID=14671830
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP11581780A Pending JPS5740012A (en) | 1980-03-06 | 1980-08-25 | Falling device for rubber dam |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5740012A (en) |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5458922A (en) * | 1977-10-19 | 1979-05-12 | Sumitomo Electric Industries | Cuttoff weir in flexible film |
JPS56413A (en) * | 1979-06-14 | 1981-01-06 | Bridgestone Corp | Discharging method and apparatus for multilayer rubber dam |
-
1980
- 1980-08-25 JP JP11581780A patent/JPS5740012A/en active Pending
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5458922A (en) * | 1977-10-19 | 1979-05-12 | Sumitomo Electric Industries | Cuttoff weir in flexible film |
JPS56413A (en) * | 1979-06-14 | 1981-01-06 | Bridgestone Corp | Discharging method and apparatus for multilayer rubber dam |
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