卵砾层中非开挖铺管技术浅谈

非开挖施工技术是一种不进行地面开挖而进行地下铺设的工程,但对于穿越卵砾层等复杂地层具有一定的限制性。因此如何使穿越铺管的轨迹避开地下的复杂管网及成功穿越复杂地层成为非开挖铺管技术研究的面临的关键问题。本文探讨了在复杂地层(卵砾层)中导向孔的施工工艺及泥浆的配置,为非开挖技术在卵砾层中穿越铺管的应用开辟了新的思路。     

非开挖水平定向钻进技术在管道铺设中的应用

非开挖水平定向钻进铺管技术近几年来广泛应用在自来水、燃气、电信和电力等管线铺设,与开挖相比具有施工速度快、不破坏路面、不影响交通、对环境影响很小等优点.本文结合工程实例简要介绍非开挖水平定向钻进铺管施工工艺,着重对水平定向钻进铺管的导向孔轨迹设计、拉力计算及施工中注意事项进行介绍.     

谈水平定向钻非开挖铺管施工技术

介绍了水平定向钻非开挖铺管施工人员组织及所用机械设备,对测量放线、施工作业场地设置、钻机及配套设备就位、导向孔钻进等一系列的施工工艺进行了详细阐述,并总结了施工中相关质量问题的预控措施,以促进其推广应用。     

水平导向钻进非开挖铺管技术应用

系统地介绍了导向钻进非开挖铺管技术的原理、发展及其广泛的用途，阐述了该技术的优越性和先进性，旨在促进非开挖这一技术能够更加广泛地被推广使用。同时通过市政综合管网导向钻进铺管技术施工的实例，介绍了用泥浆作为钻井液和护壁，及导向钻进扩孔回拉铺管与助推设备相结合的方法，成功地解决了在厚粗砂层中水平钻进铺管施工阻力大、易坍孔的难题。     

水平定向钻技术在砂层中穿越施工技术浅析

随着非开挖水平定向钻技术在管道施工中的广泛应用,如何成功穿越砂层成为业界讨论的热点话题。结合工程实例分析在砂层中进行大口径管道穿越过程中导向、成孔、泥浆配置方案,探讨水平定向钻穿越砂层的施工工艺,为今后穿越类似地层的施工积累一定的经验。     

小型非开挖定向钻穿越砂层施工中孔壁稳定性分析

通过对小型非开挖定向钻穿越砂层施工中孔壁弹塑性力学分析,研究了砂层孔壁在土压力和泥浆压力共同作用下的受力状态,提出了最优泥浆压力的概念,为小型非开挖定向钻成功穿越砂层铺管施工提供了理论依据。     

浅谈非开挖地下管线施工技术

简述传统明开挖施工方式的不足,总结非开挖技术的原理和特点,了解目前非开挖技术三种基本类型:非开挖铺设新管技术、非开挖管道原位更换技术和非开挖管道修复技术,介绍了导向钻进铺管法、定向钻进铺管法、冲击矛铺管法、夯管锤铺管法、顶管法、盾构法和爆管法等非开挖技术应用。     

导/定向钻进非开挖技术(二)

4　施工技术导向钻进非开挖铺设地下管线施工技术主要包括导向孔施工和扩孔及铺管施工 ,其关键技术是导向孔的设计和施工 ,它受施工现场地表和地下情况等多种因素的制约。地表情况包括地形、地貌以及建筑物、道路、河流等 ,地下情况包括地下原有公用管线、地下水位、地层情况等。因此 ,在导向孔设计和施工之前必须有详细的现场勘察资料 ,一方面这是导向孔轨迹设计的重要依据 ,另一方面也是决定施工难易程度、计算工程造价的基础。现场勘察包括地表测量和地下勘查两部分 ,勘查结果反映在施工剖面图和平面图上。导向钻进非开挖铺管工程施工主…     

莆田市煤气管非开挖定向钻穿越过延寿溪的施工技术

莆田市煤气管非开挖定向钻穿越过延寿溪工程,地层为卵石层、砂层,地层复杂。施工中我们细化技术方案和技术措施,克服了地质地层复杂等难题,确保工程一次回拖铺管成功。     

市政污水管道工程中非开挖敷管技术的应用

介绍了市政污水管道工程中非开挖敷管技术的前期准备工作,论述了非开挖敷管技术的优缺点,并从材料选择、导向孔施工、泥浆配比、钻导向孔等方面研究了非开挖敷管技术的施工要点,以提高施工效率。     

浅析高速公路工程招投标中的最低评标价法

结合目前高速公路施工项目招投标活动的实际情况,阐述了最低评标价法的概念,归纳了其优点及存在问题,对完善最低评标价法提出几点策略,以期促进招标投标市场更加规范有序。     

Place-Making in Megaprojects in Melbourne

This article analyses state-led place-making practices in Melbourne. The two levels of government that influence planning in Melbourne make much of the city as ‘culturally vibrant’ and ‘creative’, and have incorporated creative city-inspired place-making principles into many layers of the planning system. An examination of the development of two mixed-use megaprojects in central Melbourne reveals however that ideals of culturally engaging public places, and indeed of creative landscapes for middle-class consumption, wither in the face of more basic imperatives for economic development. In these case studies the ‘creative city’, no matter how the idea is interpreted, has little traction either as a set of inclusive place-making principles or as a gentrification strategy. The article concludes that the creative city-inspired place-making objectives in the planning system at both state and local levels are ambiguous in their overall intents and completely unsupported by statutory controls. Such place-making objectives as are realised are the compromised results of the interplay of uncoordinated decisions, delivered at the pleasure of the developer.     

Pathogens in septage in Vietnam

Septage is widely acknowledged as a major source of infectious pathogens while disposal of septage, and the operation and maintenance of septic tanks, is not regulated in many developing countries. Twenty untreated septage and septage sludge samples were taken from Can Tho City, Vietnam to examine their pathogen content, and indicator micro-organisms. Escherichia coli and Enterococcus spp. were detected in all samples, regardless of sludge storage time. Phages were detected in 80% of samples. Salmonella spp. were detected in 70% of the untreated septage and 60% of septage sludge samples. Concentrations of phages and bacteria tested in septage sludge after many years of tank storage were much higher than the expected levels. Helminth ova were present in 95% of untreated septage samples with an average of 450 ova l^− 1, and were detected in all septage sludge samples with an average of 16,000 ova l^− 1. Twelve varieties of helminth ova were identified. More helminth ova varieties in higher concentrations were found in septage than those reported from stool samples. The varieties' frequency ranged from 10% to 50% and Ascaris lumbricoides predominated. Results show that pathogens and indicator micro-organisms, especially helminth ova, accumulate in sludge. Thus helminth ova should be considered when septage sludge is treated and used for agriculture. Proper health protection measures must be applied for people handling septage.     

在市场中实践在实践中学习在学习中进步--工程公司市场化进程的回顾与展望

近两年来，工程公司在提高市场竞争意识、推动市场化进程中做了大量工作，其中坚持走出去的方针是我们自我加压、推行加快市场化步伐的一个重要战略步骤。     

新时期广东城市化的新特点

新时期广东城市化出现以下特点:知识源导向、城市由单体向群体化发展、产业集群推动、政府主导自上而下的集约化发展、城镇化向城市化转变、由重“数量”发展向重“质量”发展的转变。     

新形势下高校强化基建财务管理的探讨

在市场条件下高校基建财务人员在加强日常财务管理的同时,必须树立起高度的工作责任心,抓好事前监督、事中监督、事后监督三个环节,全面理解、贯彻执行《高等学校财务制度》,管好用好各项基本建设资金,提高基建财务管理水平,更好地完成高校各项基建任务,以有限的投资,最快的建设速度,获得最大的投资效益。     

浅谈建筑施工临时用电安全

针对由于建筑施工临时用电安全管理的不完善和不规范操作而导致大量工伤事故频频发生的问题,为消除用电安全隐患,对建筑施工临时用电安全管理进行了归纳和分析,并提出了整改意见,以确保现场人员及电气设备的安全运行。     

Trends in ozone concentrations in Jerusalem

Ozone concentrations have been measured in Jerusalem since 1977 by a chemiluminescent ozone meter. During the last five years ozone levels have increased considerably. In order to test whether this increase reflected the growth in the number of motor vehicles or was caused by atmospheric conditions, the summer data of the last five years were analyzed. Ozone levels were characterized by the daily one-hour maxima; the atmospheric factors considered were temperature, insolation and stability. A multiple regression equation was computed and a correlation coefficient r = 0.77 obtained. The yearly mean reduced ozone levels showed a definite trend, which reflected the corresponding trend in the number of motor vehicles.     

在加拿大经历严冬

正在加拿大旅居一段时间,感触极深的是这里冬季的严寒与冰雪。冷到什么程度?我所待的萨斯克彻温省,只要有寒流"光顾",白天户外零下三四十摄氏度就是"常温"。2014年2月份一次强寒流来袭,加上风寒指数,当地最低温度竟降至-80℃!记得去年圣诞节聚会,将汽车停在户外不过四五个小时,车轮竟生生冻在了地面上!加拿大的冷,不单纯体现在     

九十年代北京建筑创作纵横谈

２０００年１２月１４日,原首规委办主任赵知敬召集北京市建筑设计研究院的部分著名建筑师就九十年代北京建筑创作风格的问题进行了座谈。以下是部分与会者发言摘要。（按发言先后顺序）