| 摘要 |
PCT No. PCT/DK80/00068 Sec. 371 Date Jul. 8, 1981 Sec. 102(e) Date Jul. 8, 1981 PCT Filed Nov. 12, 1980 PCT Pub. No. WO81/01432 PCT Pub. Date May 28, 1981.The disclosure relates to a method of producing and laying on the ground a ballasted mat defined by two layers of sheet material joined together along parallel lines and enclosing particulate ballast material by providing two sources of sheet material and continuously drawing the sheet material from the sources under the influence of the ballasted mat, continuously leading the sheet material to meet in generally overlapped relationship, seaming the sheet material to enclose at least two parallel compartments, continuously filling the two parallel compartments with particulate ballast material, continuously advancing the sources of sheet material over the ground adapted to be covered by the ballasted mat, continuously lowering the ballasted mat to the ground during the formation thereof and during the advancing of the sources of sheet material in timed relationship to the drawing of the sheet material from the two sheet material sources, and seaming cross-wise the end of each ballasted mat and the adjacent end of the next ballasted mat.
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