| 摘要 |
<p>The heel (100) has two gutters (110a, 110b) joined together by a connection plate (120) so that the gutters overlap two jambs (B1, B2) of a tunnel lintel (CT). Each gutter has a profile with U-shaped section engaging an edge of each jamb. A face of a closed side (200) arranged against an end face of the tunnel lintel is provided with an edge that engages an internal wall of the tunnel lintel. The heel is made of a poor heat conducting material i.e. PVC. A rail is assembled on an edge of one of the jambs.</p> |
