PROBLEM TO BE SOLVED: To make a guide plate for being installed in a riser secure durability high enough to receive sewage flowing in, by constituting the guide plate in such a manner that the guide plate can adapt to the risers with two or more kinds of pipe diameters; and to shorten the time necessary for working and reduce manufacturing costs, by reducing the number of working man-hours for installing the guide plate.;SOLUTION: The guide plate 15 specifies the swirling direction of the sewage by dividing an outer peripheral surface of an air core tube 12 in the riser 1 and an inner periphery surface of a riser body 11. The guide plate 15 is formed by being fixed in the state of being inserted into a slit 121 for the guide plate, which is provided in the side part of the air core tube 12. The guide plate 15 is formed in such a shape that the width of the plate is greater than the installation width W of the guide plate, and a plurality of positioning grooves 151 are provided in a recessed shape. Thus, the installation width W of the guide plate 15 can be adjusted by the fit-in margin of the guide plate 15 inserted into the inside of the air core tube 12 from the slit 121, and the common guide plate 15 can be used for the risers 1 with the two or more kinds of pipe diameters.;COPYRIGHT: (C)2007,JPO&INPIT
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