BRANCH STRUCTURE AND BRANCH TUBE JOINT FOR VACUUM SEWAGE TUBE AND CONNECTION THEREOF

摘要

PURPOSE: To enhance the preventing function of back flow as well as reduce the cost of burying construction by a method in which a branch port is formed on the expanded part of tube wall by raising the position of the branch port and also by making the rising slope of the branch tube as much a smaller as possible. ;CONSTITUTION: A branch tube 4B is connected slantly upwards to the expanded part 21d of a branch tube joint 20 connected to the main tube 4A. In burying the tube 4A, the branch port 21c is partly positioned at a higher level than the max. liquid surface W of polluted water stayed in the branched part to connect the air in the tubes 4A and 4B in order to prevent back flow from the tube 4A to the tube 4B. Also, the branch part 22 is attached with as small slope as possible. The back flow of pulluted water to the branch tube can thus be prevented, the burying depth can also be made shallower, and thus be prevented, the burying depth can also to the branch tube can the cost can greatly be reduced.;COPYRIGHT: (C)1993,JPO&Japio