单梁桥式起重机的制造工艺

单梁桥式起重机是运移和升降重物的 ,文中详细介绍了单梁桥式起重机的生产工艺过程、一些参数和焊接顺序。     

综掘工作面乳化液锚杆钻机组设计分析

针对目前煤矿机掘巷道锚杆支护速度较慢的现状 ,提出了综掘锚杆支护用乳化液锚杆钻机机组及乳化液锚杆钻机的设计思路及原则 ,介绍了该乳化液锚杆钻机机组及钻机的结构和性能特点 ,描述了该机组在煤矿机掘巷道中的应用前景。     

广州华南快速路桥基钻(冲)孔灌注桩施工技术

广州华南快速路工程有若干座桥梁，采用钻(冲)孔灌注桩基础，共112根，桩径Ф1．0、1．5及1．8m三种，桩长44～51m，由于地质条件变化大，部分地层中有断层夹泥与溶洞等不良地质，主桥桩基位于深约8m的水中，具有一定的施工难度。对其施工方法与技术措施作了介绍。     

顺序控制的矿井直流提升机谐波电流分析

双桥串联顺序控制的晶闸管变流器给电网带来不容忽视的谐波危害.通过实际测试和理论分析,阐述了这种变流器工作在不同触发角下,网侧的输入电流、基波电流、谐波电流、谐波总畸变率Di变化的规律,得出两桥变流器的触发角相差30°时与同步控制相比,谐波增加近一倍的重要结论,并针对矿井直流提升机的运行工况提出了减小谐波的控制策略.     

高聚物絮凝作用机理的定量化研究

介绍了数学形态学的基本理论,阐述了该理论用于煤泥絮凝图像处理的步骤及方法,获取了絮团粒度、桥长等微观结构参数。根据研究结果,提出了高聚物对细粒煤泥的絮凝模式,并实现了高聚物絮凝作用机理的定量化研究。     

失效混凝土保护层的修复加固技术

结合某特大桥一墩柱出现的钢筋骨架偏移、混凝土保护层厚度薄厚不均的质量问题,介绍了对混凝土保护层的再认识、保护层失效后的修复加固措施和施工方法以及减缩剂在修复用混凝土中的应用。     

Flutter control effect and mechanism of central-slotting for long-span bridges

The flutter control effect and mechanism of central-slotting, which have gradually been adopted in the design and construction of long-span bridges as an effective flutter controlling measure, were investigated with theoretical analysis and wind tunnel test. Five basic girder cross-sections representing five typical aerodynamic configurations were selected and central-slotted with two different slot widths. Then, a series of sectional model tests and theoretical analyses based on the two-dimensional three-degrees-of-freedom coupling flutter analysis method (2 dimension-3 degrees of freedom method, 2d-3DOF method) were carried out to investigate the aerody namic performance, flutter mechanism and flutter modality of the five basic sections and their corresponding central-slotted sections. The results show that central-slotting can not always improve the aerodynamic stability of bridge structure. The control effect of central-slotting depends on the aerodynamic configuration of the original girder section and the corresponding central-slotting width. If the original section is inappropriate or the slot width is unsuitable, central-slotting will even deteriorate the structural flutter performance. Theoretical investigations indicated that the differences in flutter control effects come from the different formation and evolution of aerodynamic damping, and flutter modality especially the participation level of heaving motion also has a significant influence on the control effect of central-slotting. __________ Translated from China Civil Engineering Journal, 2006, 39(7): 74–80 [译自: 土木工程学报]     

北京地铁光华路车站过桥桩施工技术

北京地铁光华路车站采用分离岛式结构,车站中洞与2个侧洞均要穿越山海丹过街天桥桥桩,为保证施工安全,在天桥不能拆除的情况下,分别考虑了双侧壁导坑法、桩基托换法以及直接穿越法。经过综合分析比较,最终采用洞内桩侧注浆,辅以支撑加固的直接穿越法,工程获得圆满成功。     

南海海八路千灯湖景观桥方案设计

结合佛山市南海区海八路千灯湖景观桥工程实例,指出了该桥主梁采用变高度箱梁,线型流畅,景观效果良好,探讨了该桥的方案设计、受力分析,可供类似景观桥设计时参考。     

规范城市桥梁检测与维修养护工作

从规范城市桥梁检测与维修养护工作全过程出发,对实际工作中的桥粱检测制度及维修养护制度进行了阐述,并针对实际操作过程中出现的问题提出了几点建议。