| 摘要 |
<p>PURPOSE:To abate the extent of frictional force as well as to keep off any damage to a line pipe so simply at low cost by covering an armoring material on an outer surface of a main pipe unit forming the line pipe via an annular wire rod, and making this material so as to contact with the peripheral ground. CONSTITUTION:An armoring material 2 is applied to a line pipe unit 1, and an annular wire rod 3 is interposed between this unit 1 and the armoring material 2. In an interval between an end of the armoring material 2 and the unit 1 or a main pipe, a sealing material is applied, while a cover 4 is applied as well, forming a bonding part with watertightness. When a liquefied layer is fluidized, compression of the ground in the pipe axial direction and frictional force due to tension are abated by what the armoring material 2 slips to the main pipe unit 1. Accordingly, such a possibility that external force due to fluidization of the ground might be transferred to the main pipe unit 1 is thus reduced. Moreover, it lessens to bulk as a ground liquefaction countermeasure so that workability and material handling are simple enough.</p> |
