急！！！关于围栏中forerunner rail到底是什么？

来源：百度知道 编辑：UC知道 时间：2024/06/30 15:43:29
The cross-sectional shape of the rails shall conform to the manufacturer's ForeRunner design with outside cross-section dimensions of 1.75" square. The top wall of the outer channel of the rail shll be 0.100" thick; the sidewalls shall be 0.120" thick for superior vertical load strength. The inner slide channel of the rail shall be 0.080" thick. Picket holes in the ForeRunner rail shall be spaced 4.715" o.c., except for Invincible style 6" long, which shall be, spaced 4.98" o.c. 能大致翻译一下吗？尤其是这个forerunner rail是什么意思？
forerunner rail是什么意思

钢轨横截面的形状应符合制造者预先的设计，外轮廓界面面积为1.75平方分米（？）。钢轨外槽顶壁的厚度应为0.1"，内壁厚度由于要承受更多的垂向载荷，应为0.12"。钢轨内滑槽厚度应为0.08"。钢轨预先设计中支孔（？）容积应为4.715"o.c.，而6"长类型的容积应为4.98"o.c.
forerunner rail好像就是先验设计，预先设计的意思，与实际尺寸相比含有更多安全余量