Please help me to explain the plane marks of the building beams.

KL3 is the frame beam, with the initial letter of 3 in pinyin, 3 is the beam number 3, and 1 in brackets indicates that the beam is across.

350×650 indicates that the beam section is 350 mm wide and 650 mm high.

Φ10 @100 (4) indicates that the stirrup diameter is 10mm and the spacing is 100mm, and 4 in brackets indicates that the stirrup is a four-legged hoop.

2φ25+(2φ 12): it means that the upper reinforcement of the beam is full-length reinforcement, and the support 2φ 12 is vertical reinforcement, which is used for limb hoop.

7 Φ 25+3 Φ 22 5/5: 7 Iron bars with a diameter of 25mm and three iron bars with a diameter of 22mm are long steel bars at the lower part of the beam. Arrange them in two rows, five in the upper row and five in the lower row.

N2 Φ16: indicates the symmetrical torsional longitudinal bars on both sides of the beam, where n is the beginning of torsional pinyin, and there is an iron piece with a diameter of 16mm along both sides of the beam height with two * * *.