水利工程建筑工地都有砂卵石骨料需要筛分,有的筛分量还很大。如果使用单层筛,就需要力工将骨料向不同规格的筛网上进行多次筛分,耗工量较多。为了解决这个难题,绥棱县水利技术人员研制出一种组合筛。这种筛是根据混凝土配合比设计对粗骨料级配的要求制做的。比如三级配,我们可以事先做好一个适合分选三级粗骨料及混合砂的组合筛。原来要筛分三次的,现在一次就完成了,因而大大提高了工效。一个三级配组合筛怎样制做呢?先用200×30×2的木板两块及100× Hydraulic construction site has sand and gravel aggregate needs screening, and some large amount of screening. If you use a single-layer sieve, you need to force the aggregate to different specifications of the screen for multiple screening, more labor-intensive. In order to solve this problem, Suiling County water conservancy technicians to develop a combination of sieve. This type of screen is made according to the requirements of the concrete mix design for the coarse aggregate gradation. For example, with three levels, we can do a good job in advance for the selection of three coarse aggregate and mixed sand combination sieve. The original screening to three times, and now once completed, thus greatly improving the efficiency. How to make a three-tier compound sieve? First with 200 × 30 × 2 wood two and 100 ×