| 摘要 |
Improvements which consist in eliminating from the beams 3 of the upper substratum the horizontal and lower flanges for securing by nailing to the beams 1 of the lower substratum of the shuttering, such that the upper beams 3 simply rest on the lower beams 1 and, when it is necessary to secure them, this is done using dihedral, obtuse-angled small plates 9 which, via one of their arms, bear on the trapezoidal isosceles base of the beams 3 and via their other arm are nailed to the wooden lath of the lower beam 1. <IMAGE>
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