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我公司承建的扬子乙烯工程聚丙烯装置,成品库屋面系采用钢管球节点平板网架结构。网架复盖面积13200m~2。共用两种规格的焊接空心钢球,即φ300×10mm(加肋)球2265个,φ280 ×8mm球606个,均由本公司机械厂采用热压凹凸模工艺成型球壳,埋弧自动焊与手工电弧焊相结合的焊接工艺制作而成。为了确保质量,我们对球体做了一些必要的检验,现将情况简介如下: 一、球壳壁厚检验球壳在压制过程中,一部分被拉伸,一部分被挤缩,造成同一球壳不同部位的壁厚亦不相同。为了确保球体承载力,JGJ 7-80《网架结构设计与施工》(以下简称《规定》)提出半球不均匀度不超过壁厚10％的要求。为此,我们抽检了半球,测点位置分布如图1所示,壁厚变化情况如图2、图3所示。
My company’s construction of the Yangtze ethylene engineering polypropylene plant, finished steel roof system using steel ball node grid structure. Grid covers an area of 13200m ~ 2. Share two kinds of welded hollow steel balls, that is, 2265 φ300 × 10mm (ribbed) balls and 606 φ280 × 8mm balls, all of which are made of hot-pressed concave and convex die process spherical shells, submerged arc welding and manual Arc welding a combination of welding technology made. In order to ensure the quality, we made some necessary tests on the sphere, the situation is summarized as follows: First, the shell wall thickness test Ball shell in the compression process, part of the stretch, part of the squeeze, resulting in different parts of the same spherical shell The wall thickness is not the same. In order to ensure the ball bearing capacity, JGJ 7-80 “grid structure design and construction” (hereinafter referred to as “the provisions”) proposed hemispherical non-uniformity of not more than 10% of the wall thickness requirements. To this end, we sampled the hemisphere, measuring point distribution shown in Figure 1, the wall thickness changes shown in Figure 2, Figure 3.