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一九七四年我局设计试制的第一孔跨度十二米低高度先张法予应力钢筋混凝土梁是工字形断面,见图1,为保证这种梁的空间结构整体性和抵抗水平力的能力,桥规规定必须设横隔版,这就使模板构造复杂、施工不便,又因梁底宽、腹版窄,灌筑梁下部混凝土质量不易保证;下翼缘悬臂过长,运输移梁过程容易损坏;断面外形也不美观,鉴于这些缺点,第一孔梁制成后就修改设计,改为有圆孔的箱形断
In 1974, the design and manufacture of the first pilot hole in our company was 12 meters in height. The pre-tensioned prestressed reinforced concrete beam was of I-shaped section, see Figure 1. To ensure the structural integrity of this beam and its ability to resist horizontal forces , The provisions of the bridge gauge must be set on the diaphragm, which makes the template structure is complex, inconvenient construction, but also because of the bottom of the beam width, narrow belly, the quality of the lower part of the concrete pouring beam is not easy to guarantee; Easy to damage; cross-sectional appearance is not beautiful, in view of these shortcomings, the first hole beam made after the modification of the design, instead of a round hole box broken