[策划书]塔式起重机英文简介

[ 策划书 农牧业策划书下载免费创业策划书下载农牧业策划书下载免费工程项目施工策划书校园店铺的经营策划书 ]塔式起重机英文简介 Tower crane 1.Introduction to How Tower Cranes Work Tower cranes are a common fixture at any major construction site. They're pretty hard to miss -- they often rise hundreds of feet into the air, and can reach out just as far. The construction crew uses the tower crane to lift steel, concrete, large tools like acetylene torches and generators, and a wide variety of other building materials. When you look at one of these cranes, what it can do seems nearly impossible: Why doesn't it tip over? How can such a long boom lift so much weight? How is it able to grow taller as the building grows taller? If you have ever wondered about how tower cranes work, then this article is for you. In this article, you'll find out the answers to all of these questions and more! 2. Part of the tower crane All the tower cranes, including some of the same: Base is bolted to the large concrete pad to support crane. Base connected to the mast (or tower), gives the tower crane with high explosive. Attached to the top of the mast is rotating units - gear and sports - to allow crane rotation: Slewing bearing units are on top of three parts: Long horizontal arm (or work institutions), which is part of the crane to carry the load. Trolley along the boom in and out of mobile cranes load center: The level of short mechanical arm, which contains electrical and electronic crane and a large concrete counter weight: Operating room Robot contains motor, make the load, with control electronics to it with cable drum, as shown: Motor-driven rotary gear unit to the location of a large unit of the leaders of more than Now let's find out how much weight this device can handle. 3.How Much Weight Can They Lift? A typical tower crane has the following specifications: Maximum unsupported height - 265 feet (80 meters) The crane can have a total height much greater than 265 feet if it is tied into the building as the building rises around the crane. Maximum reach - 230 feet (70 meters) Maximum lifting power - 19.8 tons (18 metric tons), 300 tonne-meters (metric ton = tonne) Counterweights - 20 tons (16.3 metric tons) The maximum load that the crane can lift is 18 metric tons (39,690 pounds), but the crane cannot lift that much weight if the load is positioned at the end of the jib. The closer the load is positioned to the mast, the more weight the crane can lift safely. The 300 tonne-meter rating tells you the relationship. For example, if the operator positions the load 30 meters (100 feet) from the mast, the crane can lift a maximum of 10.1 tonnes. The crane uses two limit switches to make sure that the operator does not overload the crane: The maximum load switch monitors the pull on the cable and makes sure that the load does not exceed 18 tonnes. The load moment switch makes sure that the operator does not exceed the tonne-meter rating of the crane as the load moves out on the jib. A cat head assembly in the slewing unit can measure the amount of collapse in the jib and sense when an overload condition occurs. Now, it would be a pretty big problem if one of these things fell over on a job site. Let's find out what keeps these massive structures standing upright. 4.Why Don't They Fall Over? When you look at a tall tower crane, the whole thing seems outrageous -- why don't these structures fall over, especially since they have no support wires of any kind? The first element of the tower crane's stability is a large concrete pad that the construction company pours several weeks before the crane arrives. This pad typically measures 30 feet by 30 feet by 4 feet (10 x 10 x 1.3 meters) and weighs 400,000 pounds (182,000 kg) -- these are the pad measurements for the crane shown here. Large anchor bolts embedded deep into this pad support the base of the crane: So these cranes are essentially bolted to the ground to ensure their stability. In the next section, you'll learn how tower cranes "grow." 5.How Do They Grow? Tower cranes arrive at the construction site on 10 to 12 tractor-trailer rigs. The crew uses a mobile crane to assemble the jib and the machinery section, and places these horizontal members on a 40-foot (12-m) mast that consists of two mast sections. The mobile crane then adds the counterweights. The mast rises from this firm foundation. The mast is a large, triangulated lattice structure, typically 10 feet (3.2 meters) square. The triangulated structure gives the mast the strength to remain upright. 6.To rise to its maximum height, the crane grows itself one mast section at a time! The crew uses a top climber or climbing frame that fits between the slewing unit and the top of the mast. Here's the process: The crew hangs a weight on the jib to balance the counterweight. The crew detaches the slewing unit from the top of the mast. Large hydraulic rams in the top climber push the slewing unit up 20 feet (6 m). The crane operator uses the crane to lift another 20-foot mast section into the gap opened by the climbing frame. Once bolted in place, the crane is 20 feet taller! Once the building is finished and it is time for the crane to come down, the process is reversed -- the crane disassembles its own mast and then smaller cranes disassemble the rest. 1。介绍塔式起重机如何工作 塔式起重机是很普通的留在任何大的建筑工地。它们很容易找到——他们都经常高达数百尺到空气,也能接触就像远。建筑工人采用塔式起重机解除钢材、混凝土、大的工具,如乙炔火把,发电机,以及各式各样的其他建筑 材料 关于××同志的政审材料调查表环保先进个人材料国家普通话测试材料农民专业合作社注销四查四问剖析材料 。 当你看这些起重机,它能做到的事情,看起来几乎是不可能的:"它为什么不倾斜吗?这样一个如何长臂举起这么多的体重吗?它怎么可能会长高的建筑长得一天比一天高吗?如果你曾好奇如何塔式起重机工作,那么这篇文章是给你的。在这篇文章里,你就会发现真相,所有的问题的答案和更多! 2。部分塔式起重机 所有的塔式起重机包括基本相同的部分: 基地是螺栓到大型混凝土垫支持起重机。 基地连接到桅杆(或塔台),给出了塔式起重机爆高。 附在上面的桅杆是回转单位——齿轮和运动——允许起重机旋转: 回转大轴承的顶端上的单位是三个部分: 长水平臂(或工作机构),这是部分起重机随身携带的负荷。手推车沿着的移动载荷臂和退出起重机的中心: 较短的水平机械手臂,里面包含有起重机的电机及电子以及大型混凝土柜台重量: 操作室的 机械手臂包含电机,促使负荷,随着控制电子设备,把它与有线电视鼓,如图: 电机驱动回转单位所在地了大齿轮齿向单位领导人以上 现在让我们找出多少体重这设备可以处理的。 3。多大的比重才能提升, 一个典型的塔式起重机具有以下特点: 最大的支持,高度80米)265英尺( 起重机可以有总高比265脚如果它连接了建筑的建筑起重机暴涨。 最大到达- 230英尺(70公尺) 最大起升力量- 198吨(18公吨),300 tonne-meters(公吨=吨) Counterweights - 20吨(163公吨) 其极限载荷,为起重机可以提升为18公吨(39,690磅),但是起重机举不起这么多的重量如果负载电流被放置在结束的那个样子。越靠近负荷定位,支架上更重量起重机可以提升更安全。第3 tonne-meter评级告诉你的关系。例如,如果操作员位置负荷30米(100英尺)从桅杆、鹤能举起最大10.1吨。 起重机使用两种限制开关,以确保操作人员没有超载起重机: 最大负荷开关监控拉索并确保负荷不超过18吨。 负荷的时刻开关确保操作员不会超过tonne-meter起重机作为的额定载荷的移出的最佳人选。头部造影装配在回转单位可以测量出数量的倒塌时的最佳人选观念和过载的条件下发生。 现在,它将会是一个相当大的问题,如果这些东西倒在了工作网站。让我们来看看是什么让这些庞然大物站立。 4。为什么不会摔倒? 当你看着一个高塔式起重机,整个事情,为什么不让人觉得很夸张这些结构摔倒了,尤其是因为他们没有支持任何类型的电线吗? 的第一个塔式起重机的稳定性是一种大型混凝土垫建筑公司把几个星期之后,起重机的到来。这个便笺簿通常措施30英尺30英尺,宽4英尺(10 * 10 * 13米),重40万英镑(18.2公斤)——这些就是垫测量起重机列在这里。大锚定螺栓嵌入式深入这个便笺簿支持基地的起重机: 所以这些起重机基本上是螺栓在地上,以确保他们的稳定。在下一节里,你会学习到如何塔式起重机的“成长。” 5。它们如何“成长”? 塔式起重机在到达工地10到12撞上钻机。船员使用移动式吊车组装臂和机械部分,和地方这些水平成员在一个40英尺(12-m)柱,由两个桅杆部分。移动起重机然后加counterweights。 桅杆上涨造成这坚实的基础。桅杆大三角网格结构,通常是10英尺(3.2米)广场。给出了三角支架的结构保持直立的力量。 6。上升到最高点、鹤生长本身一个 标准 excel标准偏差excel标准偏差函数exl标准差函数国标检验抽样标准表免费下载红头文件格式标准下载 节。船员使用一名登山者或爬架,非常适合在回转单位和顶部的桅杆。这里的过程: 船员挂体重对臂,以平衡平衡力。 船员分离回转单位从山顶上的桅杆。大型液压公绵羊在前登山者推动回转单位20英尺(6米)。 起重机手采用起重机将另一个20英尺深的桅杆区域开的差距攀爬的框架。一旦螺栓的地方,该起重机是20英尺高的! 一旦大楼未完工,是时候克令吊下来,这个过程是颠倒的——起重机拆卸自己的肥大,然后小起重机拆开休息。