共查询到20条相似文献,搜索用时 46 毫秒
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为了解决租赁企业的施工升降机因生产厂家不同,附着距离不一致,导致大量的附着装置规格型号不统一、不能互换、不方便管理造成的资源浪费,设计一种在多数现场通用、互换性强、安装方便的附着装置。该附着装置采用不用的模块组合满足现场实际情况,减少了租赁企业的施工升降机附着装置的规格数量,方便企业的管理,降低企业的成本。 相似文献
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液压施工升降机的调速特性长沙建设机械研究院陈保钢随着我国建筑业的迅猛发展,超高层建筑也越来越多。为了满足施工要求,施工垂直运输设备——施工升降机必须快速、安全、可靠地输送施工人员和物料。而传统的机电式施工升降机往往难以满足上述要求,建设部长沙建设机械... 相似文献
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伍庆武 《建设机械技术与管理》1998,11(4):24-25
1996年8月5日下午,湖南省长沙市城市花园工地发生施工升降机吊笼高空坠落事故,死亡1人,伤1人。1现场勘测结果该升降机为SSZOO/20O型,传动方式为钢丝绳曳引传动,吊笼导向机构与SC型升降机一致。主吊笼坠地严重变形,副吊笼挂在导轨架顶部,天梁、套架、脱离导轨架(连接螺栓拉断)掉在地面;主钢丝绳rpl3.6mm两根断裂,曳弓1钢丝绳Qg.smm两根在副吊笼侧地面绳头处齐断;主副吊笼均未安装楔块式限速制动器,主吊笼中上、下限速开关未接线,副吊笼中上、下限位开关未接线,副吊笼下极限开关因无碰块失效。2事故经过两民工拖两斗车… 相似文献
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围绕附着升降式脚手架在高空中承受荷载后的稳定性展开讨论,解析脚手架的结构组分并对结构传力进行探讨,提出更安全的斜拉杆布置方式。运用ANSYS分析软件对附着升降式脚手架受风动力荷载时的位移进行数值分析,证明风荷载对脚手架的稳定性危害极大,以期为工程在安置脚手架时给出相应参考。 相似文献
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M. Dolce V. D. Lorusso A. Masi 《The Structural Design of Tall and Special Buildings》1994,3(2):87-106
The inelastic response of one-storey buildings subjected to lateral loads is analysed, making allowance for the real in-plane rigidity and strength of the floors. The structural model consists of a floor diaphragm supported by seven vertical resisting elements with degrading stiffness properties. The elastic design analysis is carried out by modelling the floor diaphragm as a rigid or, alternatively, as a flexible beam. The actual nonlinear response of 240 structures is studied via numerical simulations. Different stiffness and strength distributions in the lateral resisting systems and in the diaphragm are considered. The results of the investigation emphasize the need for an adequate design of the floor diaphragm as a structural element. Also, the results show that the deformability of the diaphragms plays an important role only if the lateral-force resisting system has a markedly non-uniform stiffness distribution; even in such cases, however, adopting the rigid diaphragm hypothesis leads to a more conservative design. 相似文献
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通过12组216个100 mm×100 mm×100 mm非标准混凝土试块对不同掺量铁尾矿砂和再生骨料再生混凝土性能进行了试验研究。研究结果表明:混凝土抗压强度随着再生粗骨料、铁尾矿砂掺量的增加呈现先上升后下降的趋势;当再生粗骨料掺量为30%时,混凝土抗压强度达到最大值,其值为38.34 MPa。同时,在铁尾矿砂取代率为30%时,水化程度最大,铁尾矿砂对于硬化体系堆积填充作用最为明显,使混凝土内部结构更加密实。并通过扫描电镜(SEM)对再生混凝土不同龄期时的形貌、密实性、水化产物等微观结构进行分析。 相似文献
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以重庆轨道交通三号线华新街至观音桥区间隧道工程为背景,利用ANSYS有限元软件对隧道开挖时产生的影响进行了力学模拟,重点分析了地面建筑密集地段隧道双侧壁导坑法施工的稳定性,并以隧道施工安全为目标、控制沉降为基本条件,分析了开挖中产生应力、位移的原因,据此提出了安全的施工控制措施。 相似文献
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施工升降机是我国城市和城镇化建设中不可缺少的装备,从我国经济发展长期向好的角度看,城镇化建设与发达国家的差距、保障性住房的建设及基础设施的大规模投入,使建筑机械依然有着良好的发展前景,并且国家政策规定高于30m以上的楼房施工须使用SC型施工升降机,施工升降机发展趋势是高品质、多元化、高附加值的产品。 相似文献
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Eric W. Sandt
John M. Niedzwecki
《Engineering Structures》1990,12(4):277-284A general stochastic formulation which addresses the relative motion effects of flexible structures in a random seaway is presented. The formulation utilizes a least-squares cubic polynomial approximation to the nonlinear drag force contribution. This influences the process of developing the stochastic equations of motion in two ways. First, by introducing higher order moments in the covariance form of the equations. Through the use of Gaussian closure these moments are replaced by equivalent expressions involving only second order moments. Secondly, the cubic drag force approximation results in the appearance of a three-fold convolution of the velocity spectrum in the final form of the spectral equations. Although, an iterative solution technique is required to solve the resulting spectral equations, this formulation provides the engineer with a means to directly evaluate the structural displacement spectrum at selected elevations. Once the response spectra are known extremal response behaviour can be predicted. A single-degree-of-freedom model of a monotower platform and a multi-degree-of-freedom model of a marine riser are used to illustrate the influence of the various approximations on the response predictions. Issues addressed include the impact on the viscous damping in the structural model as a result of first and third order approximations to the viscous drag force and the need to include higher modes for very flexible structures. 相似文献
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新的ZLD80高处作业吊篮在开始使用时,提升机有时会发出咯噔声,在钢丝绳上涂润滑油后咯噔声消失,而经长时间使用的钢丝绳和提升机并不发出异样声响。虽然此现象不影响吊篮的安全使用,但总是给使用者以不安全的感觉。鉴于现场观察吊篮提升机的实际工作状态有一定困难,而且提升机是封闭运行工作,无法直接观察发出声响的零件,故只能从故障现象来推测原因,用力学原理进行分析并找出解决方法。1 异常声响产生部位 由于塔帽受力点上移了1 4m,起重钢丝绳使塔帽立柱的受力杆增长,由压杆稳定性临界载荷计算公式PLj=π2EI/(μL)2式中… 相似文献