| 摘要 |
The lattice comprises at least one lattice section (9) which may be pivoted outside the lattice by means of pivoting bars (8). The elevated lattice section (9) is used to cover the negative moments in reinforced concrete constructions and comprises at least one part of round iron bars (7, 5') which is part part of the round iron bars which are subjected to tensile stress. The length of the moving section (9) of the lattice in the direction submitted to tensile stress is only a fraction of the total length of the lattice. The round iron bars (4', 5') of the moving section (9) are formed either with additional bars or with bars (7, 14) having been cut from the lattice bars. The lattice section (9) is allowed to move by welding together only part of the ties (3) of the bars (4, 4', 5, 5') in the lattice wherein a moving section is provided and pivoting bars (8) are inserted. When the round iron bars (4', 5') are not additional bars, they are detached from the bars (4, 5) after welding. |
