| 摘要 |
PROBLEM TO BE SOLVED: To eliminate to specially prepare a sealing material by sealing a joint between adjacent waterproof sheet, by using a waste plastic material liquefied by melting. SOLUTION: After jointing waterproof sheets 1 together, it is sealed by a sealing material 2 by a sealing material 2 which is made by melting polyethylene sheets used for packing the waterproof sheet 1 to a liquid state. The thickness of the sealing material 2 is 5 mm and its width is about 10 mm and thus if the sealing is performed over a length of 1,000 mm, the polyethylene sheet equivalent to 50,000 mm3 is required or disposed of for useful purpose. Also, polyethylene sheet 1 used for packing waterproof sheet 1 has a thickness of 0.1 mm and a width of 1,250 mm. Therefore, if a waterproof sheet joint 3 is sealed over 1,000 mm, polyethylene sheet of 400 mm2 is disposed of. In this way, it is not required to specially prepare the sealing material and, at the same time, the waste plastic material can easily be disposed of.
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