蚌埠站接触网施工优化方案

京沪线蚌埠站既有建筑物密集,对接触网施工影响大.通过分析提出了适合该站接触网施工的几项优化方案,以供今后类似电气化改造施工借鉴.     

浅谈既有线提速改造中接触网设备硬点的整治

主要基于铁路第六次提速京哈线哈兰段接触网设备硬点整治,通过数据对比分析,提出了硬点产生的原因和对硬点整治一些措施.     

Planktonic community structure and carbon cycling in the Arabian Sea as a result of monsoonal forcing: the application of a generic model

The Arabian Sea exhibits a complex pattern of biogeochemical and ecological dynamics, which vary both seasonally and spatially. These dynamics have been studied using a one-dimensional vertical hydrodynamic model coupled to a complex ecosystem model, simulating the annual cycle at three contrasting stations. These stations are characterised by seasonally upwelling, mixed-layer-deepening and a-seasonal oligotrophic conditions, respectively, and coincide with extensively measured stations on the two JGOFS ARABESQUE cruises in 1994. The model reproduces many spatial and temporal trends in production, biomass, physical and chemical properties, both qualitatively and quantitatively and so gives insight into the main mechanisms responsible for the biogeochemical and ecological complexity. Monsoonal systems are typified by classical food web dynamics, whilst intermonsoonal and oligotrophic systems are dominated by the microbial loop. The ecosystem model (ERSEM), developed for temperate regions, is found to be applicable to the Arabian Sea system with little reparameterisation. Differences in in-situ physical forcing are sufficient to recreate contrasting eutrophic and oligotrophic systems, although the lack of lateral terms are probably the greatest source of error in the model. Physics, nutrients, light and grazing are all shown to play a role in controlling production and community structure. Small-celled phytoplanktons are predicted to be dominant and sub-surface chlorophyll maxima are robust centers of production during intermonsoon periods. Analysis of carbon fluxes indicate that physically driven outgassing of CO₂ predominates in monsoonal upwelling systems but ecological activity may significantly moderate CO₂ outgassing in the Arabian Sea interior.     

南京长江第三大桥钢塔柱设计与加工

南京长江三桥钢混结合区置于索塔下横梁顶面。为避免涡激振动和驰振,通过10种切角方案和3种切角形式断面不同攻角情况下风洞试验对塔柱进行选型,并在塔端设置一组制振设备,以控制索塔架设过程中的振动。节段连接采用高强度螺栓。使用ANSYS程序进行结构有限元分析,对最不利的施工状态进行检算。在工厂制造板块和锚箱,在工地组焊钢塔柱节段,在桥位进行钢塔柱节段安装。通过焊接评定试验,确定焊接工艺和焊接顺序,采用大型数显端面加工落地铣镗床和精密测量设备,确保加工精度。     

超深长条形基坑立柱上浮规律及其对钢筋混凝土支撑附加弯矩的影响

基坑开挖会造成立柱上浮,引起钢筋混凝土支撑的附加弯矩,严重的会造成支撑失稳。通过系统监测超深长条形基坑开挖过程中不同断面处地下连续墙和立柱上浮量,该文总结了基坑开挖过程中立柱上浮和规律,得到了影响基坑立柱上浮的三个因素：开挖深度、开挖速度和立柱位置。从而推导了立柱上浮造成的钢筋混凝土支撑附加弯矩和立柱上浮力的计算方法。根据监测结果,计算了某基坑施工过程中立柱上浮造成的钢筋混凝土支撑附加弯矩的变化规律。     

横向土压力对板桩主动土压力区内桩列的内力影响及桩列的内力计算

在斜顶桩铜管板桩结构中，准确计算位于板桩后主动土压力区内的支撑桩内力，对准确确定工程造价和确保工程质量是必要的。分析横向土压力对位于板桩后主动土压力区内桩列的内力影响，对桩列的内力计算进行探讨。     

振冲碎石桩法在高液限软粘土地基处理中的应用

首先对振冲碎石桩法在不同土质地基中的加固机理进行了阐述;然后,以实际工程为依托,对应用振冲碎石桩法处理高液限软粘土地基的施工、加固效果检测等方面的问题进行了讨论。对于高液限的软粘土地基,常规的排水固结方法很难得到预期的效果,采用振冲碎石桩法,形成复合地基,可以较好地解决高液限软土地基的加固问题。     

用于科隆—莱茵／美茵新线的高速接触网

SICATH1.0型大功率接触网是为科隆—莱茵/美茵的新建线路开发的。在该线路上,使用2架受电弓时最低行车速度为330 km/h,使用1架受电弓时行车速度可达400 km/h。其机械和电气性能可与Re330型接触网比美,且其投资费用明显降低。     

接触网定位装置的改进和应用

本文针对目前接触网传统的“钩环结构”定位装置易造成弓网事故的原因进行了分析,介绍了铰链连接式防抬高定位装置的结构特点和应用情况。     

中心站用移动接触网时6．5m线间距可行性探讨

通过介绍目前铁路集装箱中心站常规设计模式和集装箱装卸机械,分析了当装卸线采用移动接触网时影响线间距的主要因素,同时给定了线间距为6.5 m时集装箱装卸机械横向操控最大允许误差并对运营管理提出建议.