Support.Modular towers equipped with canister jacks shore up the RSS on 39A while it gets structural steel reinforcement. (Photos courtesy of Barnhart Crane & Rigging Co.)

t他的美国国家航空航天局(Neudy National Aeronautics and Space Administration)将在地球上陷入28个月以上后即将启动其航天飞机计划。重型升级到肯尼迪航天中心,包括抬起数千吨重的两个巨型发射结构,正在为宇航员准备今年夏天定于今年夏天进行的航天飞机发射。

At the launch complex located on Merritt Island, Fla., contractors are engaged in an intricate program of corrosion control and steel reinforcement required by NASA’s new "Return to Flight" safeguards. The Discovery liftoff, scheduled mid-to-late July, would be the first space shuttle to fly since the Columbia disaster grounded the fleet two years ago (ENR 2/10/03 p. 11).

Michael说,这两个发射塔的实际重量称为“ 39a”和“ 39b”,从未在其30多年的运行中测量过,所以“第一件事是让Pad B准备好返回飞行。”H. Olka,休斯敦United Space Alliance LLC的项目经理。该公司是波音公司和洛克希德·马丁公司(Lockheed Martin Corp.)的合资企业,是NASA的航天飞机计划的主要承包商。发现是从PAD 39B起飞。

2004年1月,总部位于纽约州布法罗的布法罗液压分包商在39B的旋转服务结构下,将21个提升千斤顶定位在102英尺长,50英尺宽和130英尺高的管状钢制下在装有有效载荷的同时,在铁路卡车上摆动120°,以封闭航天飞机。RSS铰接到固定的服务结构,这是一个大约40英尺平方英尺的钢制塔,几乎是RSS的两倍。两者都站在八角形混凝土垫上。分包商将RSS提升约1英寸,测量了每个点的液压压力,并考虑了千斤顶的足迹。当地总承包商Ivey's Construction Inc.总裁Kevin W. Ivey说,这项行动“是我们第一次引起RSS的首次升压”。

Computing the mass of the RSS on launch pad 39A was done in February 2004. The results for both structures came in at a combined 5,311 tons. Engineers found that over the years, the towers were loaded well above their design.

美国的团队通过再次提高钢结构并安装新的上行比赛组件来纠正安全问题。工人于今年1月和3月39日完成了39A的新拟合。3英尺长。黄铜竞赛适合上铰链柱,其中RSS枢轴与FSS。

去年八月至一月,工人使用一个名为“黑色美女”的碎煤渣在90 psi上磨碎了RSS。然后,RSS收到了无机锌,上面含有波特兰水泥的油漆。美国腐蚀控制经理哈里·摩尔(Harry Moore)说:“我们炸毁并涂了60万平方英尺的钢。”

Similar work on 39A is slated to wrap in January 2006 after NASA completes a project to beef up structural members. At this time, the RSS on 39A is jacked up on three modular towers designed by Barnhart Crane & Rigging Co., Memphis, Tenn., while Ivey’s reinforces the structure with1/2-in. steel plate. The towers are scheduled to release the 2,500-ton load on July 20.

更正:关于维修肯尼迪航天中心的最新故事包含一个错误(ENR 6/13p。16)。新利18备用代替轴承组件并称重发射塔的总承包商是佛罗里达州泰特斯维尔的工业钢铁公司,布法罗液压作为其分包商。