桥梁维修加固中粘贴钢板的造价分析

粘贴钢板是目前广西桥梁维修加同中的常用方法,此方法能充分利用旧桥,降低工程造价,并能尽快恢复通行。文章通过对粘贴钢板的工、料、机、价格构成分析,探讨如何编制补充定额计算粘贴钢板的造价。     

龙潭特长公路隧道运营通风方案比较

龙潭隧道系沪蓉国道主干线宜昌至恩施公路上的特长隧道,长约2×8.7 km,是控制全线工期的重点工程,其运营通风又是整个设计中的关键一环。文章结合工程实际情况,从通风、防灾救援和施工组织等因素综合考虑,介绍了通过技术经济比选确定的相对可靠、经济实用的运营通风方式。     

Experiential Incrementalism: On the Theory and Technique to Implement Transport Plans and Policies

The paper describes an approach to the vexing problem of transport planning and policy. It deals jointly with three questions, which in today's practice are addressed separately: How are hypotheses about transport problems and alternatives to their solution developed? How can a good plan or policy be identified? What is the process of implementing a transport plan or policy? In doing this the paper has the ambitious objective of proposing a new model and process for transport planning and policy. It is applicable in developed and developing countries and is not restricted to the transport sector. The paper builds on, and is a reinterpretation of two cornerstone transport planning and decision-making models – the CATS (Chicago Area Transportation Study) Planning and Design Model and Braybrooke and Lindblom's Disjointed Incrementalism. It advances a technique of experiential incrementalism (termed polisanalysis) to develop and implement plans and policies. It proposes that problems should be diagnosed by observation and continuous data collection; that their continuous analysis, finding the “cure”, and implementation take place through the method of experiential incrementalism. In this method interventions are grounded on the theories of neoinstitutional economics and psychoanalysis and derived using contact function, explained in the paper, which renders the method scientific replicability. Experiential incrementalism can employ a wider array of options in planning and policy than is presently thought possible. Like other scientific methods, its application requires rigorous training.     

Dual extended Kalman filter for vehicle state and parameter estimation

The article demonstrates the implementation of a model-based vehicle estimator, which can be used for combined estimation of vehicle states and parameters. The estimator is realised using the dual extended Kalman filter (DEKF) technique, which makes use of two Kalman filters running in parallel, thus 'splitting' the state and parameter estimation problems. Note that the two problems cannot be entirely separated due to their inherent interdependencies. This technique provides several advantages, such as the possibility to switch off the parameter estimator, once a sufficiently good set of estimates has been obtained. The estimator is based on a four-wheel vehicle model with four degrees of freedom, which accommodates the dominant modes only, and is designed to make use of several interchangeable tyre models. The paper demonstrates the appropriateness of the DEKF. Results to date indicate that this is an effective approach, which is considered to be of potential benefit to the automotive industry.     

连续下坡路段交通安全的改善措施

分析运营阶段连续下坡路段事故特征以及存在的突出问题,借鉴国内外典型连续下坡路段安全改造的经验,提出了一系列连续下坡路段的安全改善措施。道路管理部门可以合理运用这些措施,减少交通事故,提高连续下坡路段的安全性能。     

对我国农村公路养护资金问题的研究

随着我国对农村公路建设投资力度的加大,农村公路的养护问题明显突出,由于农村公路养护资金的严重不足,致使大部分农村公路处于失养状态。文章通过对我国农村公路养护资金问题的研究,提出了农村公路养护在资金筹集、监管、使用方面的思路。     

火花塞的鉴别及常见故障检修

详细阐述汽车发动机火花塞的技术要求、火花塞工作不正常症状,同时指出外观鉴别火花塞和测试法,以及火花塞的常见故障及维护调整方法。     

基于雨水资源化利用的城市排水系统优化设计

为解决城市日益突出的水资源危机以及现有雨洪排水系统所导致的城市水涝、城市生态环境恶化等一系列严重环境问题,提出了基于雨水资源化利用的城市雨洪排水系统优化设计方法,采取相应的工程措施,将汛期雨水“先就地利用,后排出,再蓄积调节利用”。该方法可以达到节约城市生活饮用水资源并减轻防洪压力的目的。     

深圳市梧桐山盘山公路改造设计

梧桐山盘山公路原是一条等外级公路,通过合理组织交通,线形标准采用山岭重丘区三级公路的标准,注重道路景观、结合边防设施的需求,改造为城市次干道。     

混凝土内植筋技术的应用一例简述

在城市建设中,常遇到新增管线穿越已建桥梁的问题,在桥梁上增设管线支架对桥梁构造或多或少会产生一些影响。该文通过工程实例,介绍在桥台台身位置采用植筋技术浇筋牛腿作为支托,架设一条热力管道穿越桥下的设计、施工及应用评估。