上软下硬地层中超长灌注桩循环钻进结合旋挖钻进技术

浙江省龙港市人民医院建设工程（二期）桩基础采用钻孔灌注桩形式，桩基工程体量大，工期紧，质量要求高，针对桩基工程中遇到的难点，通过循环钻进结合旋挖钻进分段成孔方式得以解决，并列举了本技术施工进度快、用电用水负荷小、节能环保、施工质量高等优势，说明了该技术能够有效处理上软下硬的复杂地质。     

水平定向钻进技术在穿越汉江输油管工程中的应用

就穿越汉江时采用的水平定向钻进技术工程实例,分析阐述水平定向钻进技术具体施工过程,指出了水平定向钻进技术施工优点,并对该技术的使用前景进行了展望。     

基于钻进参数的岩土地层结构识别技术与方法

岩土地层结构是影响工程稳定与安全的重要因素,是地质及岩土工程勘测的主要内容。研发了一种地层地质界面识别系统,阐述了其基本组成和工作原理,建立了钻进过程识别码及岩土地层结构实时识别方法;通过花岗岩地基钻进试验研究,确定了岩体风化等级以及土层/散体、碎裂岩体及整体岩体结构的比能值范围,建立了金刚石钻进比能的地层结构分级标准,比能值分别是土层及散体为0.0017~0.6955 k N·m/cm3,碎裂岩体为0.0258~0.9798 k N·m/cm3,整体岩体为0.0018~2.4935 k N·m/cm3。研究结果表明,该方法与岩土勘测结果一致,可用于地层地质及岩土地层结构的实时识别,为岩土工程智能勘测提供了新的途径。     

定向钻长距离穿越砾石层综合施工技术的应用

针对水平定向钻施工中穿越大厚度、大粒径卵石层这一技术难题,以东莞市高埗至洪梅燃气管道定向钻穿越河道工程为例,介绍了在卵石含量极高的厚卵石层中,在城区内用地紧张、周围环境复杂的情况下,采用的水平定向钻机、钻机单侧随杆下套管、配置专用泥浆的联合施工技术。同时,建立了模拟套管顶进路径的数学模型,提出了套管入土的极限长度公式,分析了套管纵向应力的计算方法,以及套管的稳定性分析方法,成功完成了对大厚度、大粒径卵石层的穿越。该定向钻穿越工程的综合施工工艺,可为今后应用水平定向钻穿越卵石层施工提供借鉴。     

地质钻探工艺技术探讨

笔者结合工程实践,提出不同的工程地质条件,不同的钻探目的,决定了工程地质钻探方法和设备的选择。本文主要分析了钻头的选择及金刚石钻进效率,可供参考。     

钻孔灌注桩在卵石层中的施工技术

结合工程实例,介绍了在卵石层中钻孔灌注桩的施工技术,并针对工程难点、重点较为详细地阐述了采取的防止漏浆、防止坍孔、提高卵石层钻进效率等质量控制措施,实践证明取得了良好的效果,可供类似工程参考。     

广西岩溶地区大直径嵌岩钻孔灌注桩工程实践

岩溶地区大直径嵌岩钻孔灌注桩的施工,关键是如何提高成孔速度和清孔质量,本文根据近年来在广西岩溶地区施工嵌岩钻孔灌注桩的工程实践,推荐一种既实用又经济的施工方法——冲击钻进成孔辅以双泵清孔法。实践表明,该方法在岩溶发育地区施工嵌岩钻孔灌注桩有许多优越性。     

浅析管道水平定向钻进施工工艺的控制

管道埋地敷设工程传统施工工艺是对管线部位的土方进行破坏性大开挖,在遇到穿越河流、公路等特殊施工环境时甚至很难实施,致使交通运输中断和环境污染问题成为挥之不去的阴影。水平定向钻进成为管道穿越工程的首选施工工法。结合自身的监理工作经历,为管道水平定向钻进施工工艺的应用提供一些有益的借鉴作用。     

岩溶发育地区大直径嵌岩钻孔灌注桩的实践

岩溶发育地区大直径嵌岩钻孔灌注桩的施工．关键是如何提高成孔速度和清孔质量．根据近年来在广西玉林岩溶地区施工嵌岩钻孔灌注桩的工程实践,推荐一种既实用又经济的施工方法——冲击钻进成孔辅以双泵清孔法。实践表明,该方法在岩溶发育地区施工嵌岩钻孔灌注桩有许多优越性。     

既有线顶进涵施工关键技术

结合金华至温州铁路扩能改造工程第四标段顶进涵施工,介绍了顶进涵施工的关键施工技术,对后背施工及检算、顶进施工、顶进过程中的控制措施进行了阐述,为类似工程顶进施工提供了参考。     

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。     

2005年北京办公物业市场七大趋势

趋势一:CBD区域写字楼集中放量从各区域规划方案上看,CBD区域多数项目在03～04年处于项目的报批手续及拆阶段,预计2005年正式推向市场,因此2005年CBD区域将成为北京市场供应集中的域,区域即将供应的项目有北京财富中心(二期)、金地国际花园、万达广场、SOHO尚都、万通中心、世纪财富中心、怡禾国际中心、光华国际等。除去未知项目,2005CBD写字楼办公面积的供应量为60万平方米左右。中关村区域经过一段时间的集中供后开始逐步放缓,2005年供应的体量相对较大的项目有中关村金融中心、新中关。金街区域可能开盘的项目只有2个:英蓝国际中…     

Developments in immersed tunnelling in Holland

Holland has 22 immersed tunnels (14 road, 5 rail and 3 utilities tunnels). Another three are under construction, and more are foreseen. The tunnels are of the concrete type, i.e., constructed without a steel shell. The paper describes developments in technology and in design philosophy since the first immersed tunnel was completed 52 years ago. These developments include, amongst others: the introduction of the Gina rubber gasket between elements; the division of elements into sections divided by flexible joints; the application (if possible) of longer elements (up to 268 m); the use of precast sections for tunnels that have a small cross-section; the omission of the watertight lining (made possible by cooling the concrete of the walls during the first days after pouring); various foundation methods (e.g., sand flow instead of sand jet system; piled foundations when necessary); the use of the excavation for the open ramps (or the part of the tunnel built on land) as a casting basin for the elements; the changed approach to casting basins now that well pumping is usually forbidden; and the transport of the elements across shallow locations and across the sea. It is emphasized that the current state of immersed tunnel technology is the result of a continuous international exchange of ideas and experiences.     

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。