问答题

简答题 某桥梁工程采用装配式上部构造，桥梁全长520m，跨径为40m，每孔设置7片梁，每片梁的预制周期为l0天，根据施工组织设计的安排，要求混凝土预制构件施工在8个月内。
问题：
1．请问该桥梁工程应设置多少个构件预制底座。
2．如果因施工场地的限制，只能设置2个构件预制底座，那么在施工组织设计中需安排多长时间的预制时间。

【参考答案】

本案例主要考核桥梁工程预制底座的计算及其对工期的影响。
1．计算构件预制底数量
（1）计算全桥需要预制的......

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Stone is all around us. Stone is usually very hard, 46 it can also be soft. Stones have many uses. In some 47 , artists carve (雕刻) beautiful things out of soft stones, because they can be shaped easily. In ancient times, people carved 48 persons or animals out of soft stones, which could be carried along with. While in some European countries, statues (雕塑) are carved g49 hard stones and they do not change easily. In summer, the hot sun 50 on these statues and in winter the snow falls on them, but they 51 remain beautiful. Stone is strong and long-lasting. So, it is 52 enough for buildings. A house built of stone does not catch fire as easily as 53 made of wood. Some stones are coloured, so they make the 54 look wonderful. People can also get a fire with stones. Besides, some kinds of stones can be used to 55 jewellery (珠宝). We’ve found stones are really amazing. 46.__________A. and B. but C. or D. so
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