球团竖炉导风墙水梁的力学分析及水梁漏水后的处理措施

本文重点对球团竖炉导风墙水梁进行抗弯的强度校核,并对比不同钢管数量下及水梁穿管后,水梁受到由弯矩作用所产生的最大应力,同时根据上述力学分析给出在水梁漏水后的处理措施,并对处理措施进行论述。     

加热炉水梁漏水原因分析及修补方案

通过对现场实际情况的调研，定性地分析了加热炉水梁漏水的原因。建立了水梁的平面和三维实体模型，并利用ANSYS给出的有限元分析结果，确定了水梁产生裂纹的根本原因，即水梁的高度偏差和在高温交变载荷作用下的受力变形。最后，根据有限元的计算结果，将原焊接结构修改为三通结构，可以提高焊缝的焊接质量和使用寿命。     

加热炉步进水梁开裂原因及其对策

一、前言: 广钢连轧分厂加热炉步进水梁是在消化引进技术基础上国内设计制造的,全炉有四根运动梁和五根固定梁,长度约为16米,均采用双管单回路结构,水管材质为20号钢。上管顶部焊接250X30X40MM材质为ZGCR25N120RE的耐热滑块,滑块间距为20MM。自94年4月投入使用后,于次月即发生水梁开裂漏水现象.并在随后的七个多月时间里,发生十四次二十五处基本类似的水梁开裂,误产时间达460小时。95年元月对水梁耐热滑块结构改造后进行全套水梁更换。     

延长八钢竖炉导风墙水梁使用寿命的措施

通过对八钢 8m2 竖炉导风墙水梁的问题进行分析 ,认为高速气流穿过导风墙水梁时 ,其中所含粉尘颗粒对管壁和筋板的磨损是影响水梁寿命的主要原因。为了延长水梁寿命 ,先后采取了增加水梁管径和管壁厚度 ,在水梁管壁周围增加耐火材料保护层等措施 ,并在此基础上采用了一种新的制作工艺 ,提高了水梁的使用寿命。     

对梁,底组合步进式加热炉半热滑轨的改进实践

介绍了间断式半热滑轨的研制和应用过程，以及经过节能技术改造，用新型半热滑轨代替老式滑轨的使用。实践表明，不但解决了以往的水梁漏水的问题，而且使线Ｃ级品率提高了３．３９％，每年可增产３５００ｔ线材，吨钢热涌单耗降低０．１４ＧＪ，年创经济效益２３９万元。     

用有限元分析加热炉活动梁漏水原因及对策

通过对现场实际情况的调研，建立了加热炉水梁的平面和三维实体模型，并利用ANSYS软件给出的有限元分析结果，确定了水梁产生裂纹的根本原因，即水梁的高度偏差和在高温交变载荷作用下的受力变形。最后，根据有限元的计算结果，将原焊接结构修改为三通方式，提高了焊缝质量．延长了水梁的使用寿命。     

板坯步进式加热炉水梁安装工艺

介绍了水梁模拟热状态下的安装工艺。这种安装方式改变了冷态安装预拉伸产生的应力和焊接后标高变化的不利因素。另外这种安装方式将水梁安装的理论上升到了实践,并且给检查验收提供了可以看得见摸得着的实际效果。     

汽化冷却加热炉水梁泄露原因分析及应对措施

通过对天钢高线厂2~#加热炉发生泄露事故的水梁立柱进行拆解,结合现场情况进行分析,确定了水梁泄露事故发生的直接原因是立柱芯管脱落和耐火材料脱落,提出了发生事故时的应急处理措施和预防措施。     

南（京）钢竖炉导风墙的设计

针对国内竖炉导风墙寿命普遍偏低的问题,南钢通过对竖炉导风墙砖的形式、材质及其砌筑方式进行改进,并加大导风墙水梁钢管的尺寸,使导风墙寿命大大提高,其中砖的寿命可达３年左右。为进一步使导风墙水梁的寿命与与砖的寿命匹配,在对钢管受力情况及弯曲性能进行分析的基础上,提出了两种新的改进设想,预计这两种方案能使水梁寿命增至５年左右。     

120t转炉／炉卷轧机生产线步进梁式加热炉热水循环系统改造

1概述 步进梁式加热炉是120t转炉／炉卷轧机生产线的关键设备,而热水循环系统是加热炉汽化冷却系统中最重要的一个冷却系统,主要用于步进梁式加热炉炉内固定水梁、活动水梁等部位的汽化冷却。热水循环系统一旦出现故障,必将严重威胁着步进梁式加热炉的安全、稳定运行以及炉卷生产线的正常顺行,严重时甚至会造成炉内固定水梁和活动水梁全部塌卧的重大设备事故,如重新砌炉,最少需要4—5个月的时间,这就意味着炉卷生产线将被迫停产4—5个月。但自2005—09—30投产以来,由于热水循环系统原设计存在很多不合理因素,致使系统中设备故障频繁,且不具备在线检修的条件,     

Forensic Examination of a Noncomposite Adjacent Precast Prestressed Concrete Box Beam Bridge

On the evening of December 27, 2005 the fascia beam supporting the east side parapet wall of the third span of the Lake View Drive Bridge failed under the action of dead load. To gain insight into the potential causes of the failure a series of forensic analyses were conducted on the beams decommissioned from the bridge. The study correlates external observations of surface condition with internal chloride profile, depth of carbonation, and existing corrosion. The forensic investigation indicated that strand cover was reduced due to the construction methods of the time. The chloride level in the concrete at the lower layer of strands was high enough that corrosion would be expected. Chloride attack was identified to have come from the leakage of water between beams from the bridge deck surface above. Based on the research findings recommendations are made for visual inspection, and guidelines are provided for condition rating of noncomposite prestressed concrete box beam bridges.     

建(构)筑物渗漏水浅析

通过对部分建(构)筑物渗漏水工程(如屋面漏水、地下工程漏水、厕浴间漏水、外墙渗水)的调查、分析,发现其主要原因为:防水设计不合理,材料质量无保证,施工质量差。建(构)筑物渗漏水影响建(构)筑物外观和使用功能;严重者导致钢筋锈蚀、混凝土发生碱骨料反应,受力系统承载力降低,危及主体结构安全。为此,应规范防水工程设计、施工,加强防水工程的监理和质检监管力度,增大防水工程的投入,采用防水新材料、新技术、新工艺等措施防治建(构)筑物渗漏水。     

A novel method to detect the water leakage from tuyere nose cooling circuit in blast furnace

The water cooled tuyere noses, through which hot blast is blown into the furnace, are exposed to very high temperature region of raceway inside the furnace. As a result the chances of rupture of cooling pipes within the tuyere nose are significantly high. The rupture causes water dripping into the furnace and if it continues and unnoticed for a prolonged period it lowers down the local raceway temperature and thus adversely affects the product hot metal and slag quality. Moreover, with heavy water leakage, there is a danger of explosion; monitoring of the cooling water is therefore essential. Despite the availability of water flow metre at each tuyere it is difficult to identify the leaking tuyere at the early stage unless the rupture size grows bigger and so the leakage. In several cases the furnace is forced to shut down to manually inspect the leakage occurring without prior knowledge of the exact tuyere number. Identification of water leakage at an early stage is therefore necessary to prevent process disturbances due to chilling of the furnace and avoid the unscheduled downtime for tuyere replacement. This paper presents a method to identify the water leakage from tuyere nose cooling circuit in blast furnace and the adverse effect of water leakage on the performance of the blast furnace. A system called water leak detection system is developed for different blast furnaces in Tata Steel Jamshedpur to monitor the water leakage through tuyere nose and identify the exact leaking tuyere based on a dimensionless number called leak detection factor.     

Factor and Cluster Analyses of Water Chemistry in and around a Large Rockfill Dam: Implications for Water Leakage

Based on water chemistry data, a rockfill dam in South Korea was investigated to identify major parts of substantial dam water leakage. Sinkholes in the dam crest and abnormal water leakage through the dam were observed since the first impounding of the dam. Previous investigations, including observational drillings, hydraulic tests, geophysical surveys, and tracer tests, revealed the development of a high permeability zone in the clay core and an abnormally high phreatic line zone in the left embankment. Sequential tracer tests provided further evidence of locations of preference and rapid water leakage pathways. In this study, we examined the usefulness of water chemistry data to confirm previous findings of water leakage. Factor analysis of the water chemistry data revealed major processes controlling the chemical composition, which include the wash-out and successive dissolution of fill materials in the dam interior, interaction between percolating water and dam core materials, and contamination of seeping water by grouting materials and previous tracer tests. Distinct spatial distribution of similar chemical groups was illustrated by cluster analysis and confirmed the location of major water leakage at the left abutment adjoining the spillway.     

管线探测仪对测量供水管道漏损的作用

供水管道在供水过程中出现渗漏和破损,如何及时发现漏损的水量以减少供水的损失,减少漏失率,全功能管线探测仪在供水管道测漏上起了至关重要的作用。     

汽化冷却在竖炉烘干床及导风墙水梁上的应用

论述了水冶竖炉工艺生产过程中，上部烘干床及下部导风墙大水梁，在长期处于高温重负荷的环境下，其使用寿命，安全性，可靠性和冷却效果与安装特点有极大的关系。汽化冷却系统的应用，大大改善了烘干床及导风墙大水梁的可靠性，延长了其使用寿命。     

Cracking and Reinforcement Corrosion in Short-Span Precast Concrete Bridges

A nationwide survey revealed 14 states having bridges comprised of precast, nonprestressed, concrete channel beams. Currently, the Arkansas State Highway and Transportation Department (AHTD) bridge inventory includes approximately 389 in-service bridges using 5.79?m precast channel beams that were constructed using 1952 AHTD bridge details. Results from a statewide inspection of these bridges conducted by the writers revealed bridges with extensive concrete longitudinal cracking at the flexural reinforcing steel level and exposed reinforcing steel. Approximately 2,000 beams in 95 precast concrete channel beam bridges were inspected during a statewide investigation; longitudinal cracking at the reinforcing steel level was observed in 60.4% of the beams and exposed flexural reinforcement in 21.2%. A combination of flexure cracking from the live-load overloads and the presence of moisture has led to this high level of beam deterioration. The source of this moisture is humidity and water seepage at joints between adjacent beams. This paper examines the causes of longitudinal cracking deterioration by examining the influences of water permeation and humidity on the corrosion of flexural reinforcement in precast concrete channel beams.     

德兴铜矿西破铁路运矿隧洞洞壁渗漏水处理探讨

本文通过对西破铁运隧洞洞壁渗漏水产生的原因进行了系统的分析,提出一种对隧洞内壁缝隙渗漏水防治的施工方案,此方案施工操作简便,防渗效果好、适用防治多种不同因素引起的钢筋混凝土拱壁缝隙出现的渗漏水.     

冶炼厂地下给水管网漏水管理的探讨

从给水管网的施工、水管及附件的质量和运行管理方面分析了西北铅锌冶炼厂给水管网漏水量较大的原因 ,提出了相应的检漏防漏措施     

连铸二冷配水对纵裂纹漏钢产生的影响

研究了连铸二冷配水对纵裂纹漏钢产生的影响。研究结果表明,二冷配水的不均匀冷却是引起纵裂纹漏钢的主要原因。因此二冷配水应均匀冷却,以杜绝因冷却不均匀而产生的纵裂纹漏钢,在经过技术攻关对其工艺调整后,河北纵横钢铁在近几年的生产实践中再未出现过纵裂纹漏钢现象,纵裂纹漏钢得到有效控制。