| 摘要 |
The invention relates to a plastic earth-covering sheet (1) manufactured by ejection from flat or circular matrices for use in earth covering or in covering by the formation of tunnels. The plastic sheet in question bears succesively along the two sides separate fluid casings meant to contain fluid materials (crushed earth, mud, sand etc.) formed by the sheet itself, upon overlapping and heat-sealing of the casing ends (2). When in use, the fluid material enters each separate casing (6) through the openings (5 or 7) and serves as an indispensable load for the steady stabilization of the fluid material to the structure of the tunnel or to the linear cultivations covering line (eg. asparaguses). The plastic cover renders the linear cultivations or the earth covering via low tunnels safer against wind at little expenses and man-work, it improves its effective service life and offers quality earlier production. |
