电动施工平台在安厦时代广场中的应用

针对安厦时代广场外墙装修工程,阐述了工程概况及施工要求,施工方案的选择;介绍了电动施工平台产品及性能指标,以及施工方案的设计,包括平面设计、立面设计、施工平台安装流程,以及电动施工平台设计荷载;深入探讨了电动施工平台在安厦时代广场外墙装修工程中的应用情况。工程实践表明,在该工程中使用电动施工平台,既提高了工人的工作效率,保证了施工质量,又降低了工程成本。     

建筑工程外墙保温施工的要点

外墙的保温施工是建筑工程中非常重要的施工环节,因此结合当下先进技术、充分考虑建筑工程特点做好外墙的保温施工工作是关键。文章阐述了建筑工程外墙保温施工的优势,分析了建筑外墙保温施工的要点,提出了建筑工程外墙的质量控制策略。     

倒挂式可移动笼梯在外墙装修施工中的应用

在建筑外墙装修时,一般多采用落地式脚手架或吊篮作为辅助操作平台,但在大型外墙装修材料运输、安装时非常不便。为此,介绍一种倒挂式可移动笼梯作为外墙施工的辅助操作平台,该平台毋需反复拆装,不仅节约了周转材料、减少了费用,而且缩短了施工周期,还取得了较好的环保、经济效益,可在类似工程中推广。     

基于物联网的升降作业平台远程监测管理信息系统设计

升降作业平台作为建筑外墙结构和装饰施工作业平台,具有工程适应性强、操作方便、安全性好等特点,适用于新建和既有高层建筑更新改造.为进一步提高升降作业平台施工安全性,本文介绍了采用物联网和传感技术设计开发的升降作业平台远程监测管理信息系统,该系统以传感器、PLC、变频器为感知和处理单元,以GPRS RTU为远程数据传输单元...     

弧形外墙饰面劈开砖施工方法探析

介绍了弧形外墙饰面劈开砖施工的特点,从基层清理、外墙外保温施工、抗裂砂浆找平、饰面劈开砖粘贴等方面,阐述了弧形外墙饰面劈开砖的施工技术,并总结了其施工要求,达到了安全可靠、节约成本、外形美观的效果。     

电动施工平台在城市更新外墙施工中的应用

电动施工平台能充分满足施工场地狭小、既有建筑需正常使用等条件,适用于城市更新、旧城改造等工程,可达到快速高效安全施工的需要。以某办公楼外墙改造工程为例,对电动施工平台的性能及用途、施工技术、工艺、危险源的管控、安全保障措施进行了阐述。在不影响办公楼内部正常工作的情况下完成了外墙更新。通过实例应用表明,该平台具有稳定舒适、安全性好、防火防盗、承载力较高等优点。     

外墙外保温的应用及其质量控制

在建筑施工中，发展外墙外保温技术已成为实现建筑节能的重要环节。概述了外墙外保温体系的特点，介绍了几种外墙外保温施工技术及其工艺流程，并从材料、设计和施工三个方面分析了外墙外保温施工的质量控制。     

胶粉聚苯颗粒外墙保温系统节能技术应用与分析

通过对胶粉聚苯颗粒外墙保温系统的组成,技术特点,施工方法和保温特性分析,与其他保温板类材料形成的保温系统的多方面比较,针对应用中存在的问题进行了总结,以期使胶粉聚苯颗粒外墙保温系统得到更广泛应用。     

建筑外墙保温工程施工技术要点

文章概述了建筑外墙保温工程施工技术,包括施工技术的特点及重要性;说明了建筑外墙保温工程施工技术要点,包括合理选择保温材料、无机保温砂浆施工技术、内外墙联合保温施工技术、外墙结构细节处理技术.     

住宅类建筑外墙渗漏原因及其防治措施

文章分析了住宅类建筑外墙渗漏原因;给出了住宅类建筑外墙渗漏防治措施,包括编著统一的设计标准、加强对施工技术的控制、加大材料控制力度、控制淋水试验中的漏水现象.     

基于耦合FDM-DEM方法的TBM滚刀最优化研究

为确定TBM盘型滚刀的最优布置,结合有限差分法(FDM)和离散元法(DEM)的优点,采用FDM-DEM耦合的数值模拟方法,对不同刀间距和贯入度条件下TBM双滚刀破岩过程进行三维动态仿真模拟,分析研究了不同滚刀配置对岩石破碎效果的影响。为了验证所提出方法的可行性和准确性,利用线性切割机(LCM)对科罗拉多红色花岗岩进行了切割试验,通过对比分析线性切割试验数据,验证了所提出方法的可行性。数值模拟结果表明：对于科罗拉多红色花岗,滚刀法向力和切向力会随着刀间距和贯入度比值的增加先减少后增大,当刀间距和贯入度的比值为20左右,滚刀法向力和切向力最小。线性切割试验和数值模拟结果均表明,当间距和贯入度的比值在17～20左右,岩石切割的比能量最低,此时TBM切割效率最高。文章提出方法的方法可以为TBM滚刀刀头配置提供重要依据。     

《工程机械 噪声限值》修订标准解读与分析

随着我国现代化建设工程的发展,工程机械愈来愈向着复杂化、大型化和高速化方向发展,其振动和噪声问题显得更加突出,建设施工的噪声已成为城市的主要噪声源之一,因此逐步限制和降低工程机械噪声也成了产品升级换代，提高产品国际市场竞争力的重要途径。为此我国对《工程机械噪声限值》（GB16710．1—1996）强制性国家标准及噪声试验方法GB16710．2～GB16710．5—1996等标准进行了修订，即将于2012年1月1日开始实施。     

铣刨鼓轴承损坏原因分析及改进措施

对某型号路面铣刨机的铣刨鼓轴承损坏的原因进行详细分析,叙述现场处理过程,并提出改进措施。改进结果表明措施得当,使整机的可靠性得到提高。     

XM130型路面铣刨机

XM130型铣刨机采用铣刨室后置、后部输料、行走实心胶轮、全液压四轮独立驱动以及皮带驱动铣刨鼓等方案.最大铣刨宽度1 320 mm,最大铣刨深度315 mm,工作速度0～30 m/min,转场行驶速度07 km/h.该机自动化程度高,集机、电、液于一身,具有负载控制、深度找平控制(选装)等先进功能,经优化设计的刀头螺旋线排列方式的铣刨鼓,更适合路面铣削.介绍XM130型铣刨机车架总成、动力传动方式、行走系统特点、输料装置等结构特点.     

Effects of circumferential pick spacing on boom type roadheader cutting head performance

Effects of equal and unequal circumferential pick spacing on the performance of boom type roadheaders having cylindrical cutting heads are investigated. For this purpose, two experimental cutting heads with equal and unequal circumferential spacing are designed and manufactured. The cutting head with unequal circumferential spacing is specifically designed to prevent tool-holder overlap at the nose section. Manufacturing difficulties associated with equal circumferential pick spacing due to tool-holder overlap are discussed with solid modeling and practical applications. The heads are tested at Park Cayirhan Coal Mine in Turkey and their cutting performances are analysed. Although better cutting performance for equal circumferential spacing are predicted by force–balance analysis, in situ measurements of instantaneous (net) traversing speed and cutting rate, pick consumption rate and machine vibration show that no significant difference exists between the performances of the two cutting heads.     

Axial load capacity of cold-formed steel wall stud with sheathing

A cold-formed steel wall panel consists of a cold-formed steel frame and sheathing on one or two sides, the latter attached to the frame by self-driving screws. It is observed during tests that the axial behaviour of a wall stud in the panel is significantly different from that of an individual stud. This paper presents an analytical model for predicting the axial failure load of the wall stud with sheathing. The sheathing is simplified as continuous elastic support to the stud. The spring stiffness of the elastic support is calculated by analytical and finite element methods. The predicted results are compared with measurements from full-scale tests. For the range of parameters considered, it is found that: (a) the Poisson ratio of the sheathing material as well as screw spacing have negligibly small influence on panel failure load; (b) the elastic modulus of the sheathing material has a significant influence on the failure load, only if it is smaller than 1000 N/mm²; (c) although in general the thickness of sheathing affects the stud failure load, thinner sheathing may be used without changing the stud load capacity considerably; (d) stud spacing has moderate influence on stud failure load. The results presented in this paper can be used to guide practical wall panel designs.     

Optimization of inter-helix spacing for helical piles in sand

The optimization of the inter-helix spacing is a key issue of the axial bearing capacity of helical piles. In this paper, based on the cavity expansion, an analytical approach considering the small-strain stiffness, strength, compressibility and stress level of sand around the helical pile was proposed to analyze the influence zone of the helices to determine the optimal inter-helix spacing in sand. The calculation results of the proposed method were verified using the centrifuge test data and finite element analysis for helical pile in Congleton HST95 sand. They were also compared with those using the Meyerhof pile foundation theory. The results show that the optimal inter-helix spacing based on Meyerhof pile foundation theory differs significantly from the measurement. The range of the influence zone for the helices in sand calculated by the cavity expansion theory matches with the data from literature. The calculation results with the proposed method are consistent with the range of the optimal spacing ratio inferred in the centrifuge tests. The results based on the two-dimensional (2D) finite element model (FEM) are also basically consistent with the calculated analytical solution.     

冷弯薄壁型钢组合墙体墙架柱的轴压性能试验研究

对冷弯薄壁型钢组合墙体墙架柱的轴压性能进行试验研究,分析是否覆墙面板、墙面板材料、自攻螺钉间距以及墙架柱间距等因素对墙架柱在竖向荷载作用下的稳定承载力的影响。6块足尺组合墙体试件的试验结果表明:墙架柱覆墙面板后,竖向荷载下的稳定承载力提高明显;纤维增强硅酸钙防火板(CSB板)约束的墙架柱较单面定向刨花板(OSB板)约束的墙架柱稳定承载力提高18.8%;墙面板为OSB板采用常规螺钉间距150mm和300mm时,螺钉间距改变对墙架柱稳定承载力影响微小,但当墙面板为CSB板时,螺钉间距由300mm加密至150mm,稳定承载力反而减小;墙架柱间距增大时,其稳定承载力略有降低。通过研究GB 50018—2002《冷弯薄壁型钢结构技术规范》与试验结果的对比,提出各组合墙体墙架柱计算长度系数的建议取值,同时提出通过对规范公式添加修正系数来考虑各种因素对墙架柱稳定承载力影响的设计方法。     

SMW用于地铁车站深基坑变形影响参数研究

依托于南京地铁一号线南延线百家湖车站工程,利用经验证的数值模型和计算方法,研究了支护桩入土深度、不同型钢型号、型钢布置形式、不同支撑轴力、不同支撑水平间距等参数对SMW围护结构变形的影响。得出了各因素对围护结构变形的影响规律:支护结构的入土深度过小,会造成“踢脚”现象,在保证基底不失稳的条件下,当入土深度超过1.5H后,继续增加入土深度对减小支护结构水平位移的效果很小;不同形式的内插型钢布置对支护结构变形影响较大,型钢的型号对基坑变形影响较小;增加各道支撑预加轴力可以有效的减小围护结构变形,但施加过大的预应力会导致支护桩的过分后移,影响支护桩的强度,建议按照设计轴力的50%~80%取值;减小支撑水平间距是减小位移的有效方法,本车站工程支撑水平间距设为3.5~4 m为宜。     

Study on seismic performance test and calculation method of recycled steel fiber reinforced concrete shear wall

Recycled steel wire is taken from used tires, and by procedures like mechanical cutting and friction treatment, it can be converted into industrial recycled steel fiber that meets precise criteria. Such green fiber may effectively limit the growth of fractures in concrete and diffuse the fracture energy of concrete when incorporated into concrete. An investigation of the effects of materials and horizontal reinforcement spacing on the seismic performance of shear wall specimens is presented in this research. The test and numerical simulation findings indicate that the RSFRC (recycled steel fiber reinforced concrete) shear wall's fracture is substantially narrower than that of a conventional shear wall and that the shear carrying capacity and deformation ductility of the shear wall have been greatly enhanced. The energy dissipation capacity of the RSFRC shear wall specimen with varying horizontal reinforcement spacing is significantly enhanced when compared to the conventional shear wall, and the ultimate displacements are reduced. RSFRC shear wall specimen has higher stiffness in the early stage, and the overall stiffness decreases slowly. With the decrease of fiber volume fraction of RSFRC shear wall in a certain range, the shear bearing capacity and stiffness of the model will decrease slightly, but the ductility will increase significantly. Compared with the RSFRC shear wall with fiber aspect ratio of 40 and 25, the bearing capacity and ductility of the two are close, but the RSFRC shear wall with low aspect ratio is slightly insufficient. When the axial compression ratio is in the range of 0.2–0.4, the horizontal shear capacity of RSFRC shear wall increases with the increase of vertical load, but the maximum horizontal displacement becomes smaller, and the model is damaged by compression. Using theoretical calculation, this work also creates the simplified calculation method and restoring force model for the bearing capacity of the diagonal section of RSFRC shear wall. The observed findings correspond well with the test hysteresis curve and may serve as a benchmark for future study. This study provides a new research direction for the seismic performance of RSFRC structures, as well as a solid theoretical foundation and promotion for future research.