| 摘要 |
<p>PURPOSE:To connect branch tubes easily by providing cylindrical short tubes for installing branch tubes on the peripheral surface of the tube, in a synthetic tube with ribs made of providing circular ribs on the peripheral surface of a tube. CONSTITUTION:A synthetic resin tube 1 with ribs of synthetic resin such as vinyl chloride resin or polyethylene resin has numerous circular ribs 2 on its peripheral surface at specific intervals. At adequate positions of the tube peripheral surface of the synthetic resin tube 1 with ribs, cylindrical short tubes 3 are provided. The cylindrical short tubes 3 are to install branch tubes 4, and the inner diameter is made almost equal to the outer diameter of the branch tubes 4. The tube wall of the synthetic resin tube 1 is bored along the inner surface of the cylindrical branch tube 4. And the branch tube 4 is installed to the cylindrical short tube 3 with an adhesive. As a result, the tube wall can be bored easily, and the branch tube can be connected simply. Furthermore, invasion of rainwater, or earth and sand after the connection can be prevented.</p> |
