| 摘要 |
<p>The aid has an angle forming unit for forming a 90 degrees corner angle at a predetermined position of a set of positioning strips (5) and for temporarily holding the strips in a bent position, where the aid is made of plastic. The unit has a bending rod (2), which is provided away from a base plate (1). The plate is turned-over around the strips for forming the corner angle. A pair of finger-shaped counter bearings (3, 4) is provided away from the base plate, where the bearings press the bent strip against the bending rod until the strip is secured and underlay ground is hardened.</p> |
