水中抛石修建桥梁临时基础是抗洪抢险中常用的一种施工方法。但是在施工过程中必须解决好以下几个问题：1抛投块石尺寸的确定所投块石必须满足如下要求：（1）适合人工或机械搬运和抛投；（）在水中不易被冲走c根据铁道部科学研究院的研究成果：d＝O、105A＝—－v、“”“hIQ式 The temporary construction of bridges in the water riprap is a commonly used construction method in flood fighting and rescue. However, in the construction process must solve the following questions: 1 throwing cast stone size determination cast stone must meet the following requirements: (1) suitable for manual or mechanical handling and throwing; () in the water is not easy to be washed away c According to the research results of the Ministry of Railways Science Institute: d = O, 105A = - v, “” hIQ formula