芯模振动制管设备的技术指标探讨及发展应用

介绍了芯模振动制管工艺的技术要求及成型制度,同时对芯模振动制管设备的主机和辅助设备,如激振器(芯棒)的技术指标、模具、滚焊机、搅拌设备和行车的配置要求等作了探讨.并结合国内外情况,介绍了芯模振动制管设备的发展应用.     

内芯模振动水泥制管机及工艺参数探讨

简析了内芯模振动成型制管工艺的特点,并描述了各种形式的内芯模振动成型制管机的基本结构。对该制管工艺的生产工艺参数作了理论分析,提示了生产操作应注意的要点。     

芯模振动工艺及其应用

介绍了芯模振动制管工艺原理和制管设备;芯模振动制管工艺与其他制管工艺特性的对比和国内芯模振动制管工艺的应用情况;芯模振动管材的发展前景和预埋吊锚、钢筒、PVC管材的应用前景。     

芯模振动制管工艺设计与质量控制

概述了芯模振动制管工艺的应用情况及特点,分析和阐述了芯模振动的基本原理和基本理论,提出了针对原材料、混凝土、喂料、振动与碾压成型、养护以及工艺布局、工作坑和设备安装等质量控制要点,并提示了应依据振动原理和振动理论进行芯模振动制管工艺的设计、生产与质量控制,这有助于加深对芯模振动的认识、理解与应用。     

混凝土排水管制管工艺的应用与发展

城市建设对高品质管材的大量需求、行业环保要求趋严及劳力短缺的现状,促进混凝土排水管生产工艺及装备的提升和发展。对目前主要的芯模振动、径向挤压及升芯式芯模振动制管工艺的应用情况进行对比分析,并对制管工艺发展方向进行展望。     

芯模振动制管与径向挤压制管优缺点分析

对排水管的制管工艺问题进行了分析,从制管原理和优缺点两个方面对芯模振动制管工艺和径向挤压制管工艺特点进行了论述,并对比分析了两种制管技术的工艺技术、经济指标和裂缝原因,以期为后续类似工程提供一定的借鉴。     

芯模振动制管法十三年回顾

上世纪90年代引进的芯模振动制管法,可称为湿法脱模工艺。本文总结了十多年来芯模振动制管湿法脱模工艺的利弊,提出了该工艺方法生产合格管材的建议。     

芯模振动工艺及其应用

介绍了芯模振动成型工艺,从生产工艺的先进性、产品质量和技术经济指标等方面与其他制管工艺进行了较为详细的比较,对主机设备的构造作了比较系统的说明;并对具有发展前途的几种排水管材进行了简要介绍。     

芯模振动制管工艺引进的消化和吸收

芯模振动制管设备引进后,为适应市场的需要,从技术和经济的角度必须改善其工艺的适应性.针对该设备在使用过程中逐渐暴露出的一些问题,重点阐述了解决管体变形、改变管口构造、开发市场需要的新品种管材的方法:对先进设备不仅是引进还要进行消化和吸收,要充分发挥设备自身的先进性,以适应市场的需要.     

芯模振动工艺生产钢筋混凝土排水管

目前,我国钢筋混凝土排水管常用的生产方法主要有离心法、悬辊法、立式振动法、芯模振动法。芯模振动工艺是由丹麦佩德哈博公司首创．目前欧美国家普遍采用该工艺生产钢筋混凝土排水管,我国是从上世纪80年代开始引进该设备进行技术革新．随着城市化进程的快速推进,芯模振动制管工艺将成为钢筋混凝土排水管生产技术的发展方向。     

芯模振动制管工艺相关问题及处理方法探讨

对芯模振动制管工艺在应用中所遇到的管壁表面气孔、麻面、插口壁裂缝、工作面变形以及钢承口柔性接头排水管插口工作面的制造方式等进行了分析和探讨,并详细叙述了以上所遇问题的处理方法。     

Process design decisions in community-based collaboration: implications for implementation and collateral social benefits

Collaborative decision-making processes are conducted widely in public affairs at various scales, from community to metropolitan, regional and national. They vary from highly formalized and prescribed processes, such as “regulatory negotiations”, to collaborative planning processes directed by urban planners or other public agency staff, to rather informal processes within community-based organizations. While substantial effort has been invested in identifying the benefits of collaboration, we ask; do the benefits materialize in each case? We researched one ad hoc community collaborative in Oregon, USA, widely considered a success in the aftermath of agreement. We were interested in the implementation of agreement provisions, as well as in any social benefits from the process. Relying on published documents, surveys and interviews one year after the process ended, and additional interviews and on-site observations five years later, we found that despite the initial enthusiasm and confidence in actions proposed in the final report and social relationships strengthened during the process, evidence of long-term success on these two dimensions was mixed. This case provides a cautionary note to process facilitators, urban planners, public administrators and stakeholder and citizen participants. Participants face many strategic and process design decisions. Among these are choices about institutional linkages, stakeholders, the decision rule, and clarity about the purpose and goal of the process. While the degree of “success” of any collaborative may not be our call as observers, we contend that implementation and social impacts are critical to assessing the value of these processes. Consequently, we propose that participants and facilitators alike should understand and consider appropriately the micro-decisions that can and do add to critical implications on these two important dimensions.     

PP-R管施工工艺

论述了PP -R给水管的施工工艺和质量控制方法。通过对管道连接、支架设置、伸缩补偿的分析 ,给出了防止PP -R管施工管道扭曲、错位、接头渗漏的先进工艺 ,适用于各类工程项目PP -R管的施工     

影响沥青混合料振动压实的主要因素分析研究

沥青混合料的振动压实对沥青混凝土结构的形成起着至关重要的作用,是保证沥青混凝土防渗性能的重要环节。结合土石坝沥青混凝土心墙工程实例,介绍了沥青混合料的振动压实原理、各项工艺参数,并对影响沥青混合料振动压实的各种因素逐一进行分析。     

煤层气液化流程及技术现状

阐述了煤层气利用的重要性和煤层气液化储运的优点,介绍了级联式液化流程、混合制冷剂液化流程和带膨胀机的液化流程3种典型的煤层气液化流程,分析了煤层气和常规天然气液化技术的研究现状。     

内穿插HDPE管修复技术在大口径给水管修复中的应用

结合福州市北区水厂源水管修复实例,介绍了内穿插HDPE管修复技术的原理、施工工艺、主要工序及其技术指标、优缺点、衬管壁厚的选择。结果证明,利用该技术修复大口径给水管可减少投资、节省工时、对环境破坏少,宜于推广。     

浇筑密实度和均匀度对结构混凝土耐久性的影响

为建立浇筑期结构混凝土耐久性质量控制方法,采用振动分层法,研究了混凝土浇筑密实度、浇筑均匀度对其渗透性的影响,建立了混凝土浇筑密实度和浇筑均匀度的量化控制方法——电阻率稳定区间法.结果表明:混凝土浇筑密实度和浇筑均匀度均决定于材料流动性和振捣时间;相比混凝土抗压强度,混凝土渗透性对浇筑密实度和浇筑均匀度更为敏感.通过计算量化判定电阻率稳定区间(SRER),并以其起点为判别点,可以保证混凝土浇筑密实度和浇筑均匀度处于综合最优状态,优化混凝土孔隙结构,显著提升混凝土抗渗透性能.     

液化石油气蒸汽式气化器工艺流程及控制方式

介绍了燃料气气化器和升压气化器的工艺流程及控制方式,探讨了蒸汽式气化器2种控制方式的优缺点及适用工况。     

UASB＋生物接触氧化＋混凝沉淀法处理废水探讨

结合工程概况,根据设计进出水水质,通过调研及实验室小试后进行处理工艺的优化组合,确定了以“UASB＋生物接触氧化＋混凝沉淀法”的处理工艺,并详细对其处理工艺进行了介绍,指出该工艺具有操作简单、管理方便、投资省等优点,可在同类丝绸废水处理中推广使用。     

Enhancement of uniform temperature distribution during casting solidification by methoding process

The main purpose of this study was to adapt proper methoding models to improve the cast ability and reduce the defects in casting. According to many researchers, 90% of the defects in casting are due to the wrong design of gating and riser systems and 10% due to casting defects. Here we are improving the runner and riser placement through methoding process. In the present work, to validate the advantages of methoding, we have selected casting model with and without methoding, temperature distribution over various positions have been analysed and it is found that casting model with methoding provides uniform temperature distribution.