铁路既有桥梁快速换架技术的研究与应用

提出用跨线龙门吊机进行换架梁作业,研究可快速生成的拼装式龙门吊机和新的喂梁、吊梁作业模式,克服了传统换架方法对铁路正常运营干扰大、工期长、造价高等诸多弊端。工程实践证明,该技术安全高效、对行车干扰小、适用性强。     

杭州湾外海沉桩施工技术

阐述海力#801大型打桩船采用S-280型双作用液压锤和GPS卫星定位技术,在杭州湾恶劣的风、浪、流的条件下,下沉超长、超大直径钢管桩的施工技术。     

苏通大桥75 m跨连续箱梁节段预制高精度控制技术

简要介绍75m跨连续箱梁预拱度设计、箱梁节段预制高精度几何线型控制技术和几何数据采集及控制，说明预制箱梁时预制单元的定位，几何控制测点的布置及测量容许误差控制指导原则以及预制过程中的误差调整方法。     

Characteristics and potential impacts of under-ice river plumes in the seasonally ice-covered Bothnian Bay (Baltic Sea)

The northernmost basin of the Baltic Sea, the Bothnian Bay, is ice-covered for about half the year. During this time, distinct under-ice river plumes develop, even seaward of the smallest rivers, that are substantially thicker and larger in extent than during the summer months. Wind mixing is negligible, and during late spring in April or May, the highest annual discharge occur while the sea is ice covered, thus providing conditions for the formation of extensive under-ice plumes. These plumes are characterised by high levels of trace elements (e.g., Al, Fe and Zn), organic matter (TOC and dissolved organic carbon [DOC]), nutrients and also optically active substances (colored dissolved organic matter, CDOM). The under-ice plumes provide an important pathway for undiluted transport of land-derived substances to the pelagic waters of the basin, affecting the salinity, chemistry and optical properties of coastal waters. Freshwater ice growth on the underside of an existing sea ice sheet also restricts the buildup of sea ice and under-ice algal communities, potentially in large areas along the coasts. Plume water influences the optical characteristics of coastal waters for a period of time after ice break-up, potentially affecting primary production in these areas. Furthermore, the formation of under-ice plumes potentially has a positive feedback on the ice season length due to freshening of the coastal waters (earlier freeze-up) and restricted oceanic heat flux (slower melting).     

三峡工程变动回水区上洛碛滩航道整治

分析川江上洛碛滩滩险特性、碍航原因及三峡水库分别按156m和175m蓄水位运行时期该滩的滩势变化,并根据实测资料分析本整治工程(156m蓄水位运行期)的效果。     

G305线田庄台大桥引桥桩基础施工

主要介绍、分析引桥桩基施工中遇到的一些问题及施工过程。     

钢管混凝土拱桥拱肋线形控制技术

湘潭湘江四大桥是世界上最大跨度的斜拉飞燕式系杆钢管混凝土拱桥,该桥结构复杂,技术含量高、施工难度大。钢管拱肋线形控制是本桥施工的关键技术之一,本文介绍了湘潭湘江四大桥钢管拱肋从制作到管内混凝土灌注的钢管拱肋线形控制技术。     

湘潭湘江四大桥主墩承台大体积混凝土配合比选择及应用

本文主要介绍了湘潭湘江四大桥承台大体积卵石混凝土参照常规混凝土试验方法进行配合比设计以及实际应用情况,据此对大体积混凝土配合比设计应用进行了总结。     

高速铁路大跨度空腹式连续刚构设计

银西高铁漠谷河2号特大桥桥高114 m,为适应桥高并结合地形起伏要求,主桥采用(120+210+120)m预应力混凝土空腹式连续刚构桥,主梁为拱形V撑与箱梁截面的新型组合结构形式,该结构为铁路预应力混凝土桥梁跨度之最。采用Midas软件对主桥进行结构计算,模拟悬臂浇筑法施工,辅助以临时扣锁和支架,使V撑上下弦可以同时施工。计算结果表明,该结构增加了结构的跨越能力,减少了跨中收缩徐变上拱值,在施工及运营阶段的刚度、强度均满足规范要求,具有良好的动力特性。该结构采用柱板式空心墩与主梁固结,线性优美,工程经济,结果可为铁路大跨高墩桥梁设计和施工提供参考。     

长江干线航道GPS测量控制网建设工程设计与施工

介绍长江干线航道GPS测量控制网建设工程的设计与施工情况。该网是我国大江大河建立的第一个全程覆盖的GPS(C级)测量控制网,也是GPS技术在我国航道管理行业中成功运用的范例。