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本刊1990年第6期孙启昌同志写的《怎样留置现浇钢筋混凝土楼梯施工缝》一文讲述了既常见又常被人忽视的问题,看后觉得有些问题有必要再详细说明一下。观浇钢筋混凝土楼梯一般分为板式楼梯和粱式楼梯两种。前者可看成斜放的钢筋混凝土饭,楼梯段由踏步和踏步下的斜向楼梯段板组成,整块锯齿形斜板支承在两端的平台粱上,所以最大弯矩在跨中,
Comrade Sun Qichang’s article “How to Retain Construction Cracks in Cast-in-situ Reinforced Concrete Staircases” written by Comrade Sun Qichang in 1990 described the problems that are common and often overlooked. After reviewing it, I feel that some problems need to be explained in detail. Observed pouring reinforced concrete stairs are generally divided into two kinds of slab staircases and squat staircases. The former can be seen as obliquely placed reinforced concrete rice, and the stair section is composed of stepped and stepped diagonal stair sections. The entire sawtooth inclined plate is supported on the platforms at both ends, so the maximum bending moment is in the middle.