| 摘要 |
PROBLEM TO BE SOLVED: To prevent weeds from propagating with their buds growing upward (apogeotropism) through a gap by phototropism and their roots growing downward (positive geotropism) by geotropism, as the weeds have a nature of growing on photosynthesis when their seeds come flying into the gap and germinate due to a flow of rainwater, when gap is generated vertically at a boundary line of a boundary block and a paving material due to aged deterioration. SOLUTION: A construction 1 to be joined is provided with a weed-preventing recess 2 opening toward its wall surface. An upper side inner surface 2a of the recess 2 is formed to tilt upwardly toward the inner part of the recess 2. The other construction 4 to be joined is formed in a manner that a material of the other construction 4 is placed to fill up the recess 2 so that a surface 4a may be positioned near or above an upper end 2c of an opening part 2b of the recess 2. COPYRIGHT: (C)2004,JPO
|
