基于钢管控制的插板连接节点受弯性能研究

结合试验研究和理论分析对钢管插板节点受弯性能做了初步探索,以1/4(1/2)环形加强板节点为基础,根据钢管能量理论和虚功原理,推导出基于钢管控制的插板连接节点受弯极限承载力公式,并与日本《输电线路钢管塔制作基准》作了对比分析。结果表明:该理论分析模型的适用性较好,对工程设计有一定的理论意义和适用价值。

超深逆作钢管柱垂直度控制施工技术

结合国内规模最大的逆作法工程——南京德基广场二期工程的超深逆作法钢管柱施工,介绍了提高逆作法钢管柱垂直度的多项施工技术,包括技术创新、技术改进和质量控制要点等。实践表明,逆作钢管柱实时调垂控制系统对纠偏是可行有效的;混凝土浇筑平台和钢管柱安装支撑架的使用,对提高钢管柱的垂直度至关重要。

钢管混凝土系杆拱桥施工控制研究

在施工控制的各阶段在施工现场布置了应力和变形监测点,并根据监测结果与理论值的对比不断完善施工控制措施。在满足整体稳定性要求的前提下,较好地控制了系杆、横梁、拱肋、吊杆的应力及变形,控制了施工中的结构行为,确保了大桥的顺利合拢,为钢管混凝土系杆拱桥的施工监控提供了参考和依据。

压力钢管制作过程质量控制之我见

结合夹马口引黄泵站更新改造工程压力管道制作过程,主要就压力钢管制作过程中质量控制进行全面阐述,同时提出自己的看法和一点建议,以确保压力钢管制作质量。

大口径埋地钢管竖向变形控制措施

大口径埋地钢管(管径≥1000mm)长期承受上层土壤的静压以及局部地段过往车辆等的动压,加之钢管本身弹性变形很大,在选材、制造、运输以及施工中操作不当很容易引起较大竖向变形以至失稳,严重影响使用功能。为此,我们必须对大口径埋地钢管采取一定的竖向变形控制措施,即从选材、制造、运输、施工等各个环节层层把关,再在管道内加设管道支撑来确保管道竖向变形最小化,确保相应工程顺利而又通畅的实施。

PLC在钢管生产线追剪伺服控制系统中的应用

为了提升钢管同步型定长分割的精确程度及系统的平稳性,提出了以PLC及伺服体系为前提的追剪自行管控计划。根据系统开展工作的方式,探究了追剪运转这一过程,以PLC及伺服型驱动器为基础对系统开展硬件方面的设计,构建了运算开启残长的数字模式,对软件开展设计。使用成果体现出这一系统分割精确程度高,运转平稳,提升了企业的经济收益,有良好的发展市场。

老虎嘴水电站施工中对坡积体稳定采用高压控制性灌浆钢管抗滑桩处理方案浅析

介绍了西藏林芝巴河老虎嘴水电站导、泄洞进出口边坡治理采取的技术措施。通过对钢管桩、高压控制性灌浆等工艺原理进行分析及施工方法阐述,对该工法进行了总结。

Photodetection of the Quality on Internal Surface of Steel Pipe

In this paper,a photoelectric device is introduced,which is used in detecting the quality on internal surface of thin and long steel pipe.In this device,the CCTV lens is used for extract tile flaw information on internal surface of the pipe,and make IBM-PC/AT 486 computer as controlling and image processing system.By this instrument,the functions,such as the digital conversion of input information,image processing,classification of recognition and output display can be obtained.In the petroleum and chemical industry,by using this apparatus,we can detect the quality on internal surface of various metal pipes with real-time automatically.

Leachate Control Technology Using H-Jointed Steel Pipe Sheet Piles with H-H Joints at Coastal Landfills

H-H joint of ＂H-jointed SPSP with H-H joint＂, which is made up of interlocking two H-steel sections of different sizes, is the one of SPSP＇s joint to improve the hydraulic conductivity. ＂H-H jointed SPSP with H-H joint＂ is expected to be applied to a vertical cutoff wall in coastal landfill sites. In H-jointed SPSP with H-H joint, the H-joint is completely imperviousness. H-H joint, however, is pervious at interlocked state because a gap of 8 to 11 mm is left between the interlocking flanges, therefore, a water interception treatment must be conducted to seal the gap. The water shielding treatment of H-H joint is executed by coating the gaps with a water-swelling sheet of paint before its installation. Then, hollow space is generated in H-H joint after treating by water-swelling sheet, and that space can be used effectively. This paper proposes leachate control technologies using H-H joint interior space of SPSP cutoff walls. The possibility of those technologies and hydraulic conductivity of H-jointed SPSP with H-H joints are demonstrated by conducting the hydraulic conductivity test.

Study on intelligent control technology for forming steel pipe of pipeline with JCO process

Based on plastic bending engineering theory and machine vision technology, the intelligent control technology for forming steel pipe with JCO process is presented in this paper. By ‘twice pre-bending method’ in the first forming step, the springback law can be obtained. With the springback law and the target angle, the exact punch displacement which determines the formed angle in each bending step is predicted. In the succedent forming steps, the bending process is carried out with the exact punch displacement by real-time revising the springback law. And the angle error in each forming step is calculated by comparing the actual formed angle with the target angle. By conducting compensation for the last angle error in the next forming step, each precise bending process step is realized. A system of intelligent control technology for forming the steel pipe was developed. A calibration method is proposed to calculate the exterior parameters of the CCD camera, in which the equilateral triangle is em-ployed as the calibrating board and only one image needs to be captured. A mathematical model, which converts the angle in the image into the actual formed angle, is derived. The experimental results showed that the ellipticity of the formed pipes was less than 1.5% and the high-quality pipes can be manufactured without the worker's operating experience by employing the in-telligent control technology.

Development and industrial application of ultra-fast cooling technology

A new-generation TMCP(NG-TMCP) with ultra fast cooling(UFC) as core technique was suggested instead of the conventional TMCP in which some problems are to be solved.And the ultra fast cooling technology has been successfully applied to the plate rolling production in Shouqin Metal Materials Co.Ltd.Industrial trials are reported for the production of X70 pipeline steels(about 70000 t) under UFC conditions.Pipeline steels with reasonably good properties have been produced on an industrial scale.UFC can improve the temperature uniformity,the mechanical properties and the plate profile of X70 pipeline steel.The performance features of the trial plates can meet the standard of X70 pipeline steel.Spot test results have shown that the qualification rate of shape control,the performance and charpy impact properties for the trial plates are 95%,97% and 98%,respectively.The impact values of X70 pipeline steel at UFC mode exceed the standard requirements of X80 pipeline steel.The productivity is enhanced because cutting quantity of head and tail of the plate is reduced.The enhancement of control accuracy of the red back temperatures is favorable for industrial production of X70 pipeline steel.The reduced production of the steel-making has been industrially achieved,since a new composition was designed by reducing the vanadium content to less than 0.045 wt.%.