| 摘要 |
A trench in which the trench cover is combined by screw is provided to discharge the foreign material inside the trench easily and to prevent the lost of trench cover. A trench(100) in which a trench cover is combined by a screw comprises a drainage way(110) in which a cover support plane(130) is integrally formed in both side of the top. A plurality of mounting grooves(150) is integrally formed in one side of the cover support plane. A screw moving groove(250) is prepared on the upper portion of trench cover(200). A contact surface(210) corresponding to the cover support plane of the trench is curve-cut integrally. An elastic support piece(230) corresponding to the mounting groove is curve-cut in one side of the contact surface. |
